JPS61288587A - Color image pickup device - Google Patents

Abstract

PURPOSE:To equalize the frequency and phase of an index signal arising in an output signal to those of an oscillation wave outputted from a reference oscillator and to minimize the shift of an initial phase by controlling the deflecting circuit of an image pickup tube. CONSTITUTION:Such a signal generating pattern as to generate the index signal corresponding to the attitude of a scan by electron beams at the time of scanning by electron beams is given to an optical path up to the photoelectric conversion part 4 of the image pickup tube 2. Instead of said pattern, the pattern of a color splitting strip-like filter F can be used, for instance, and black and white patterns are provided in the vicinity of the filter F. Diagonal line areas show the set areas of index signal generating patterns. In this case, the deflecting circuit of the image pickup tube is so controlled that the frequency and phase of the index signal arising the output signal of the image pickup tube can be equal to those of the oscillation wave outputted from the reference oscillator.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a color television (hereinafter abbreviated as TV) imaging device, in particular, to a color separation striped filter up to a photoelectric conversion surface of an imaging tube. The present invention relates to a color imaging device configured to be provided in an optical path.

(Prior art) A color-separating striped filter is provided in the optical path up to the photoelectric conversion surface of the image pickup tube, and a striped color-separated image of the object to be imaged is applied to the photoelectric conversion surface of the image pickup tube. It is well known that various types of color imaging devices that generate multiplexed signals have been known for a long time, but most of them are configured according to the so-called general phase separation method. Even if it is configured according to the so-called general frequency separation method, there are various problems, so the applicant company has decided to use the conventional general phase separation method. In order to provide a color imaging device that does not have the problems of those configured according to the separation method and those configured according to the general frequency separation method, Japanese Patent Publication No. 53-34
We proposed a color imaging system as disclosed in Japanese Patent Application No. 854, and as an improvement thereof, we proposed a color imaging device as disclosed in Japanese Patent Application Laid-open No. 153392/1985, that is, each strip has a predetermined width. It consists of repeating a specific arrangement pattern of a plurality of types of color strips, and the phase of the fundamental wave component of the image pickup tube output signal, which is determined corresponding to the repetition of the arrangement pattern, changes depending on the color of the light. A color separation striped filter in which the colors of multiple types of color stripes are set is provided in the optical path to the photoelectric conversion section of the image pickup tube, so that the optical image of the imaged object passes through the color separation striped filter. and a storage device capable of arbitrarily storing an information signal corresponding to at least one frame period of the output signal from the image pickup tube, Prior to imaging, any specific color is imaged, and an information signal corresponding to at least one frame period of the image pickup tube output signal is stored in the storage device, and the information signal stored in the storage device is In a color imaging device, a reference signal for color signal demodulation is obtained based on the reference signal, and a predetermined color signal is demodulated from the output signal of the image pickup tube by synchronous detection or the like. The time axis of one of the two signals, the information signal obtained by reading and the output signal of the image pickup tube, with one signal as a reference and the change mode of the other signal on the time axis as a reference. A color imaging device has been provided which is provided with means for controlling to match the above variation mode.

However, in the color imaging device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-153392, the information signal obtained by reading out the information signal stored in the storage device as described above and the output signal of the image pickup tube are separated. One of the two signals is used as a reference, and the change mode of the other signal on the time axis is controlled to match the change mode of the one signal on the time axis, which is used as the reference. However, electrons are obtained based on index signals generated in the output signal of the image pickup tube corresponding to the scanning state signal generation patterns provided near the start and end of the horizontal scanning period. Since frequency information in beam scanning and initial phase information for each horizontal scanning period in electron beam scanning were used, the frequency information in electron beam scanning described above was obtained throughout the period including the video period. It has become.

However, depending on the incident light conditions, the signal generated during the video period may not generate a carrier wave in the color multiplexed signal. If you are trying to obtain frequency information in electron beam scanning,
Even when there is no incident light during the video period and no carrier wave is generated in the color multiplexed signal, a means is required to prevent this influence from occurring, and it is also not sufficient in terms of stability. It became a problem.

Furthermore, as described above, a color imaging device is provided with a storage device capable of capturing an image of any specific color prior to imaging and storing an information signal corresponding to at least one frame period of the image pickup tube output signal. If a storage device with a small storage capacity can be used, it will contribute to reducing the cost of the color imaging device, so the image pickup tube output signal is stored in the storage device as a low frequency signal by frequency conversion. A color imaging device was also proposed.

FIG. 5 is a block diagram of an example of the previously proposed color imaging device, in which 0 indicates the object to be imaged;
1 is an imaging lens, 2 is an imaging tube, 3 is a deflection yoke, and 4 is a photoelectric conversion unit of the imaging tube 2 (target having a photoelectric conversion surface)
, F is an optical color separation striped filter (color separation striped filter) 5 is the front plate of the image pickup tube 2, PrA is a preamplifier, LPF
y, LPF Q is a low-pass filter (low-pass filter),
BPF is a bandpass filter.

In the color imaging device shown in FIG. Corresponding to the optical image, an output signal from the image pickup tube 2 is output, which includes a DC component and a modulated wave in which a color multiplex carrier wave having a specific repetition frequency is amplitude-two-phase modulated by the signal.

In addition, in the imaging device shown in FIG. For both, a signal generation pattern capable of generating an index signal corresponding to the mode of scanning by the electron beam during scanning by the electron beam is provided in the optical path up to the photoelectric conversion unit 4 of the image pickup tube 2. The output signal of the image pickup tube 2 includes an index signal generating index signal provided at at least one of the vertical ends of the photoelectric conversion section 4 of the image pickup tube 2. Frequency information in electron beam scanning generated in correspondence with the pattern, and a pattern for generating an index signal provided at at least one of both ends in the horizontal direction of the photoelectric conversion section 4 of the image pickup tube 2. and initial phase information for each horizontal scanning period in the electron beam scanning generated correspondingly.

FIG. 2 shows an index signal generation pattern that should be provided in the optical path up to the photoelectric conversion unit 4 in the image pickup tube 2 in a color imaging device as described above.

In other words, at least one of the horizontal ends and at least one of the vertical ends of the photoelectric conversion unit 4 of the image pickup tube 2 are scanned by the electron beam. The setting area of the signal generation pattern that should be able to generate an index signal that sometimes corresponds to the scanning mode of the electron beam is the same as that of the electron beam scanning performed on the photoelectric conversion unit 4 of the image pickup tube 2. With range.

This diagram illustrates and explains a setting example of what kind of relationship should be used. In FIG. 2, the square frame on the outer periphery indicates the relationship between The range of beam scanning is shown, and the shaded area in the figure shows the setting area of the index signal generation pattern.

The horizontal direction in the figure is the horizontal scanning direction, and the vertical direction in the figure is the vertical scanning direction.

Furthermore, the one-color separation striped filter F is, for example, (a
'), red (R), green (G).

consisting of strips of each color of blue (B) arranged in a predetermined repeating order, or
As shown in Figure 3(b), it is composed of green (G), cyan (Cy), and golden light (W) color strips arranged in a predetermined repeating order. In addition, those consisting of repeating specific arrangement patterns of arbitrarily selected plurality of colored strips are used.

The color strips of each color constituting the color separation striped filter F described above should have their strip widths, colors, etc. set in consideration of brightness characteristics and color reproducibility. Figure 3 (
In the color separation striped filter F illustrated in a), (strip width of green color strip)>(strip width of red color strip)>(strip width of blue color strip) This shows an example in which the strip width of each color strip is determined, such as strip width).

In the already proposed color imaging device shown in FIG.
The output signal C (color multiplexed signal) from the DC component and the repetitive synchronization T of the set of color strips in the color separation striped filter F
(The carrier wave has a frequency shown as the reciprocal of T in (a) and (b) of Fig. 3) and includes a modulated wave whose amplitude is two-phase modulated by a plurality of color information. Since the signal is in the form of a signal, the color multiplexed signal is divided into a DC component and a fundamental component of the carrier wave, and each By performing synchronous detection using a reference signal having a predetermined phase, each predetermined color signal can be individually demodulated.

Since the phase of the fundamental wave component of the carrier wave in the output signal of the image pickup tube of the color image pickup device described above is determined for each color of the plurality of types of color stripes making up the color separation striped filter F, Prior to the start of imaging by a color imaging device, if light of any specific color is imaged through a color separation striped filter, the phase of the fundamental wave component of the carrier wave appearing in the output signal of the imaging tube at that time is The phase of the fundamental wave component of the carrier wave appearing in the output signal of the image pickup tube corresponds to the color of the above-mentioned arbitrary specific color of light, and corresponds to the above-mentioned arbitrary specific color of light. can be used as a reference for the phase of the fundamental wave component of the carrier wave appearing in the output signal of the image pickup tube corresponding to each color other than the color corresponding to any specific color of light, and the above-mentioned Prior to the start of imaging by a color imaging device, light of an arbitrary specific color is imaged through a color separation striped filter, and the fundamental wave component of the carrier wave obtained in the output signal of the imaging tube at that time is are stored in a storage device, and during imaging operation in the color imaging device, the fundamental wave components of the carrier waves stored in the storage device are read out, and based on them, reference signals each having a predetermined phase are generated. In this way, a required color video signal can be generated by the color imaging device having the above-described configuration.

By the way, if the scanning mode of the electron beam in the image pickup tube 2 is always constant, the signal created based on the signal read out from the storage device as described above will always be transmitted to the image pickup tube 2.
However, the deflection circuit and deflection yoke in color imaging devices are not sufficiently stable, and the scanning mode by the electron beam changes depending on the external magnetic field. Therefore, even if you read out the information signal stored in advance in the storage device as described above and create a signal that is the same as the fundamental wave in the output signal of the image pickup tube 2 based on it, it is not always necessary to However, it is not always possible to obtain the correct signal, so countermeasures are required.

In FIG. 5, the output signal (multiplexed color signal) of the image pickup tube 2 output from the preamplifier PrA is passed through the low-pass filter L.
The output signal (direct wave three-color mixture signal) from the low-pass filter LPFy, which is supplied to PFy, LPF Q, and the bandpass filter BPFI, and whose cutoff frequency is illustrated as fy in FIG. It is output to the output terminal 6 as a broadband luminance signal Sy. The track 1'1LPFy in Fig. 4 is an example of the pass-pass characteristics of the low-pass filter LI'Fy, and the curves LPF Q, BPFI, etc. in Fig. 4 are for the low-pass filter LPF, respectively. This figure illustrates examples of passband characteristics such as Q and bandpass filter BPFI.

The output signal from the low-pass filter LPF Q, whose cut-off frequency is illustrated as fN in FIG. The filter BPF extracts a modulated color signal based on a fundamental wave existing around a spatial frequency fl determined by the repeating pattern of the filter strips in the color separation striped filter F, and supplies it to the following channels.

That is, the color signal modulated by the fundamental wave described above is supplied to the synchronous detectors 5DETI and 5DET2, and the color signal modulated by the fundamental wave described above is also supplied to the frequency conversion circuit FCONVI and the gate circuits GP and Gf. There are nine supplied.

The gate circuit Gp described above is for extracting the index signal appearing in the output signal of the image pickup tube 2 in each horizontal scanning period according to the index pattern described above, and the gate circuit Gf described above is for extracting the index signal appearing in the output signal of the image pickup tube 2 in each horizontal scanning period according to the index pattern described above. This index pattern is used to extract an index signal appearing in the output signal of the image pickup tube 2 in each vertical scanning period.

The gate signal generating circuits GSp and GSf generate signals at predetermined timings based on the HD pulse and VD pulse generated by the synchronizing signal generator SG provided in the color imaging device. By being supplied with the generated gate signal SPy Sf, the gate circuit Gp selects a signal that appears in the output signal of the image pickup tube 2 in each horizontal scanning period according to the index pattern described above from among the output signal of the image pickup tube 2. The index signal is extracted, and the gate circuit Gf described above is extracted.
extracts the above-mentioned index signal appearing in the output signal of the image pickup tube 2 in each vertical scanning period using the above-mentioned index pattern.

Block PCOMP shown in FIG. 5 is a phase comparison circuit, and block FCOMP is a frequency comparison circuit. The storage device MA stores an information signal corresponding to at least one frame period of the image pickup tube obtained by imaging an arbitrary specific color before the color imaging device starts color imaging, and In the state after the imaging operation has started, a device configured to be able to perform an operation that can send out the stored information signal as a signal in a continuous state on the time axis is used. Therefore, the memory element used in the memory device MA may be a digital memory or an analog memory.

As mentioned above, prior to imaging the object, the storage device 1M
The color imaging device is provided with an information signal storage operation for at least one field period of the fundamental wave component (signal component that has passed through the bandpass filter BPF) in the output signal of the image pickup tube to be performed for A. It is started by operating a predetermined operation button on the operation section (not shown) provided in the color imaging device. Light of a specific color is automatically applied, and the storage device MA is set to the storage mode, so that the fundamental wave component in the image pickup tube output signal that has passed through the bandpass filter BPF in the output signal of the image pickup tube 2 has a frequency. The signal whose frequency has been converted by the conversion circuit FCONVI is stored for at least one frame period.

Further, when the above-mentioned signal has been stored in the memory bag WMA and the storage device MA is put into a read mode and the information signal stored therein is repeatedly read out from the memory, an information signal output from the storage device MA is 1 frequency conversion circuit F
The signal is frequency-converted by CONV2, restored to a signal in the same frequency band as the output signal of the image pickup tube, and then supplied to the reference signal generator SSG.

Then, phase comparison circuit PCOMP, frequency comparison circuit F
COMP, voltage controlled oscillator VCO1 frequency conversion circuit FC
ONV2. The imaging operation is based on the manner in which the information signal read from the storage device MA is frequency-converted by the frequency conversion circuit FCONV2 on the time axis so that each component such as the storage device MA operates in a related manner. Sometimes, the change is made to follow the manner in which the output signal actually output from the image pickup tube changes on the time axis.

As mentioned above, the modulated color signal output from the bandpass filter BPF is passed through the synchronous detectors 5DETI and 5DET2, the frequency conversion circuit FCONV 1, and the frequency comparison circuit FCOM.
With P.

A carrier wave for frequency conversion is supplied to the frequency conversion circuit FCONVI from the oscillator O3C (the frequency conversion circuit FCONVI is supplied to the frequency conversion circuit FCONV2 described later). On the other hand, the carrier wave for frequency conversion is supplied from the same oscillator O3C that supplies the carrier wave for frequency conversion).

The signal output from the frequency conversion circuit FCONVI described above is stored in the memory bag [MA] when the storage device MA is put into the write mode, and when the storage device MA is put into the read mode, the signal is stored in the storage bag [MA]. is read out repeatedly.

Once the aforementioned memory bag [MA has been put into the storage mode and the information signals corresponding to one or more frame periods have been stored therein, the storage device MA is then put into the readout mode and the information signals stored therein have been stored therein. The information signal is repeatedly read from the storage device MA and supplied to the frequency conversion circuit FCONV2.

The frequency conversion circuit FCONV2 includes an oscillator OSC.
A carrier wave for frequency conversion is supplied from the frequency conversion circuit FCONV2, and the output signal from the frequency conversion circuit FCONV2, whose frequency has been converted by the frequency conversion circuit FCONV2, is supplied to the reference signal generator SSG and at the same time to the one-phase comparison circuit PCOMP.
and the frequency comparison circuit FCOMP.

Specifically, the above-mentioned phase comparator circuit PCOMP uses the above-mentioned index extracted via the gate circuit Gp from the color signal modulated by the fundamental wave in the output signal of the image pickup tube output from the above-mentioned bandpass filter BPF. A gate circuit G is supplied to the frequency comparison path FCOMP from among the color signals modulated by the fundamental wave in the output signal of the image pickup tube output from the bandpass filter BPF.
Since the above-mentioned index signal extracted through f is supplied, the phase comparison circuit PCOMP compares the phase of the index signal extracted from the output signal from the above-mentioned bandpass filter BPF with the phase of the 1-frequency conversion circuit FCONV2. The phase comparison circuit PCO compares the phase of the output signal.
The output signal from MP is used to control the phase of the oscillation wave of the oscillator O3C, and the frequency comparison circuit FCOMP controls the frequency of the index signal extracted from the output signal from the bandpass filter BPF. The frequency is compared with the frequency of the output signal of the frequency conversion circuit FCONV2, and the output signal from the frequency comparison circuit FCOMP is used to control the frequency of the oscillation wave of the oscillator O3C.

Therefore, by subjecting the oscillator O5C to the above-described frequency control and phase control, the frequency and phase of the oscillation wave are automatically controlled, so that the output signal of the frequency conversion circuit FCONV2 ( The reference signal generator SSG, which is supplied with a reference signal (reference signal), generates the reference signal necessary for synchronously detecting the output signal of the bandpass filter BPF with the correct phase, thereby making it possible to synchronize the output signal of the image pickup tube and the frequency. The control system described above is operated so that the change mode on the time axis matches the output signal (reference signal) from the conversion circuit FCONV2.

An example of the configuration of the oscillator O3C is shown in which the frequency of the oscillating wave is controlled by the output signal from the frequency comparison circuit FCOMP as described above, and the phase of the oscillation wave is controlled by the output signal from the phase comparison circuit PCOMP. In the oscillator O5C shown in FIG. Its oscillation frequency is controlled by the voltage, and the timing at which it starts oscillating is controlled by the output signal to the one-shot multivibrator M.

That is, the one-shot multivibrator M described above
M is determined from the time position of the leading edge of the HD pulse supplied from the synchronizing signal generator SG to the terminal 7 by the phase comparator circuit PCO.
It outputs a pulse with a time width up to the time position of the trailing edge of the output pulse of MP, and the resettable voltage controlled oscillator vCO described above is activated at the time when the reset pulse outputted from the one-shot multivibrator MM disappears. Since oscillation is started at a specific oscillation phase, the frequency and phase of the oscillation wave of the oscillator O5C are automatically controlled by the above-mentioned frequency control operation and phase control operation, and the frequency conversion circuit Reference signal generator SSG to which the output signal (reference signal) of FCONV2 is supplied
The reference signal required for coherently detecting the output signal of the bandpass filter BPF with the correct phase is generated.

The output signals from the synchronous detectors 5DETI and 5DET2 and the output signal from the low-pass filter LPF Q are as follows.
Matrixed in the matrix circuit MTX,
Predetermined primary color signals are output to terminals 8 to 10, respectively.

Up to now, in the already proposed color imaging device explained with reference to FIG.
At least one of the J ends is provided with a signal generation pattern in the image pickup tube that can generate an index signal corresponding to the mode of scanning by the electron beam during scanning by the electron beam. By providing it in the optical path up to the photoelectric conversion unit, frequency information of electron beam scanning and initial phase for each horizontal scanning period can always be obtained correctly regardless of the state of incident light. Furthermore, by beating down the information signal for at least one frame period to be stored in the storage device prior to imaging using the frequency conversion circuit, it is possible to use a storage device with a small storage capacity.

(Problems to be Solved by the Invention) Incidentally, in the previously proposed color imaging device described above, the fundamental wave component in the image pickup tube output signal is beat down and the information signal stored in the storage device is processed by the frequency conversion circuit. F.C.
The manner of change on the time axis of the information signal obtained by frequency conversion by NV2 changes in accordance with the change on the time axis of the output signal actually output from the image pickup tube during imaging operation. The phase comparator circuit P
COMP, the frequency comparison circuit FCOMP, the voltage controlled oscillator vCO1, the frequency conversion circuit FCONV2, and the storage device HA.
The two signals to be compared in COMP and the frequency comparison circuit FCOMP are the index signal in the output signal actually output from the image pickup tube during the imaging operation, and the index signal in the output signal actually output from the image pickup tube during imaging operation, and the index signal in the output signal actually output from the image pickup tube during imaging operation, and the A signal of at least one frame period of the obtained image pickup tube output signal is beat down by the frequency converting means and stored in the storage device, and the index signal in the signal is beat up by the frequency converting means. It uses signals.

However, since the index signal indicating the initial phase information for each horizontal scanning period in electron beam scanning exists only for a very short period on the time axis for each horizontal scanning period, when it is beat down, Naturally, the wave number becomes extremely small. Then, the beat-down signal described above is stored in a storage device, read out from the storage/device, and then beat-up to restore it to a signal having the frequency before being beat-down. In addition, if the beatdown and beatup operations described above are performed according to theory, even if the signal restored by beatup after being beatdown is a signal that exists only for an extremely short period of time, However, in an actual circuit, if the beat-up operation is performed on a beat-down signal that exists only for an extremely short period of time, , the signal obtained by the beat-up operation becomes a signal whose initial phase is shifted from the signal before being beat-down.

The amount of the initial phase shift described above increases as the frequency of the signal after beatdown is lowered in order to further reduce the storage capacity of the storage device.

For this reason, existing color imaging devices require a means for adjusting the phase of the beat-up signal to adjust the phase of the signal, and a color imaging device that does not require such extra means was required.

(Means for Solving the Problems) The present invention consists of repeating a specific arrangement pattern of a plurality of types of colored strips, each having a predetermined strip width, and is determined in correspondence with the repetition of the above arrangement pattern. A color separation striped filter in which the colors of the plurality of color strips are set so that the phase of the fundamental wave component of the image pickup tube output signal changes depending on the color of the light is used in the photoelectric conversion section of the image pickup tube. a configuration arrangement in which the optical image of the imaged object is provided to the photoelectric conversion section of the image pickup tube via the color separation striped filter; and at least one of the output signals from the image pickup tube. 1
A storage device capable of arbitrarily storing an information signal corresponding to a frame period is provided, and prior to imaging, an arbitrary specific color is imaged and an information signal corresponding to at least one frame period of the image pickup tube output signal is provided. is stored in the storage device,
A color imaging device that obtains a reference signal for color signal demodulation based on the information signal stored in the storage device, and demodulates a predetermined color signal from the output signal of the image pickup tube by synchronous detection or the like. The optical path to the photoelectric conversion section of the image pickup tube is such that a signal generation pattern can be generated that can generate an index signal corresponding to the mode of scanning by the electron beam when the photoelectric conversion section of the image pickup tube is scanned by the electron beam. In preparation for this, frequency information in electron beam scanning and initial phase information for each horizontal scanning period in electron beam scanning are obtained from the index signal generated in the output signal of the image pickup tube. In a color imaging device, oscillation having a frequency approximately equal to the frequency of the fundamental wave component of the image pickup tube output signal and a predetermined phase determined in correspondence with the repetition of the arrangement pattern of the color stripes in the color separation striped filter described above. Compare the frequency and phase of the oscillation wave output from the reference oscillator that can oscillate waves, and the frequency and phase of the index signal generated in the output signal of the image pickup tube. Based on the respective comparison results by the frequency comparing means and the phase comparing means, the frequency and phase of the index signal generated in the output signal of the image pickup tube are determined by the reference oscillator as described above. The present invention provides a color imaging device comprising means for controlling a deflection circuit of an image pickup tube so that the frequency and phase of the oscillation wave coincide with the frequency and phase of an oscillation wave outputted from the image pickup tube.

(Example) Hereinafter, specific contents of the color imaging device of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of an embodiment of the color imaging device of the present invention. A photoelectric conversion unit (target having a photoelectric conversion surface), F is an optical color separation striped filter (color separation striped filter), 5 is a front plate of the image pickup tube 2, PrA
is a preamplifier, LPFy, LPF Q is a low-pass filter, and BPF is a bandpass filter. Needless to say, if the image pickup tube 2 is an electrostatic deflection type image pickup tube, the deflection yoke 3 is unnecessary. The optical image of the object to be imaged 0 passes through the color separation striped filter F to the photoelectric conversion unit 4 of the image pickup tube 2.
, the image pickup tube 2 emits the imaged object 0
Corresponding to the optical image, an output signal from the image pickup tube 2 is output, which includes a DC component and a modulated wave in which a color multiplex carrier wave having a specific repetition frequency is amplitude-nine-phase modulated by the signal. Furthermore, in the color imaging device of the present invention, the imaging tube 2
At least one end of both ends in the horizontal direction and at least one end of both ends in the vertical direction of the photoelectric conversion unit 4 are scanned by the electron beam during scanning by the electron beam. A signal generation pattern capable of generating an index signal corresponding to the aspect of
Since it is provided in the optical path up to the photoelectric conversion unit 4 of the image pickup tube 2, the output signal of the image pickup tube 2 contains only a few of the vertical ends of the photoelectric conversion unit 4 of the image pickup tube 2. Frequency information in electron beam scanning generated corresponding to the index signal generation pattern provided at one end of the image pickup tube 2, and at least one of both ends of the photoelectric conversion section 4 of the image pickup tube 2 in the horizontal direction. It includes initial phase information for each horizontal scanning period in electron beam scanning generated in correspondence with the index signal generation pattern provided at one end. As described above, in order to generate frequency information in electron beam scanning and initial phase information for each horizontal scanning period in electron beam scanning in the output signal of image pickup tube 2, photoelectric conversion unit 4 of image pickup tube 2 For example, the pattern of the color separation striped filter F described above may be used as the pattern for releasing the index signal, which should be provided in the optical path up to In order to generate the index signal from the pattern of the striped filter F, light of any specific color may be applied as bias light to the periphery of the color separation striped filter F to generate the index signal.

Further, as another example of the above-described index signal generation pattern that should be provided in the optical path up to the photoelectric conversion section 4 of the above-mentioned image pickup tube 2, for example, a black and white A pattern may be provided around the photoelectric conversion section 4 of the image pickup tube 2, or a pattern may be processed and provided around the photoelectric conversion section 4 of the image pickup tube 2, or other members capable of generating a predetermined index pattern may be provided in the optical path to the image pickup tube 2. , so that an optical image of the pattern provided on the member is focused on the photoelectric conversion section 4 of the image pickup tube 2,
An index signal may be generated when scanning the photoelectric conversion unit 4 with the electron beam.

FIG. 2 shows an index signal generation pattern that should be provided in the optical path up to the photoelectric conversion section 4 in the image pickup tube 2 as described above in the color imaging device of the present invention, that is, in the photoelectric conversion section 4 of the image pickup tube 2. At least one end of both ends in the horizontal direction and at least one end of both ends in the vertical direction correspond to the mode of scanning by the electron beam when scanning by the electron beam. What is the relationship between the setting area of the signal generation pattern that should be used to generate index signals such as the one shown in FIG. In FIG. 2, a rectangular frame on the outer periphery indicates the range of electron beam scanning performed on the photoelectric conversion unit 4 of the image pickup tube 2, and The shaded area in the figure indicates the setting area of the index signal generation pattern, and the horizontal direction in FIG. 1 is the horizontal scanning direction, and the vertical direction in FIG. 1 is the vertical scanning direction.

The color separation striped filter F may be configured as shown in FIGS. 3(a) and 3(b), or any other arbitrarily selected filter, as described above for the conventional example. A repeating specific array pattern of different color strips may be used.

In FIG. 1, the output signal (color multiplexed signal) from the image pickup tube 2 has a DC component and a repetition period T of a set of color stripes in the color separation striped filter F ((a) in FIG. 3, (b) A signal in the form of a signal that includes a single carrier wave having a frequency shown as the reciprocal of T) and a modulated wave whose amplitude is two-phase modulated by a plurality of color information. .

In FIG. 1, the output signal (multiplexed color signal) of the image pickup tube 2 output from the preamplifier PrA is passed through the low-pass filter 1.
．． The output signal (direct wave three-color mixture signal) from the low-pass filter LPFY, which is supplied to PFy, LPF Q, and the bandpass filter BPFI, and whose cutoff frequency is illustrated as fy in FIG. It is output to the output terminal 6 as a broadband luminance signal Sy. The curves gt and pFy in FIG. 4 illustrate examples of passband characteristics of low-pass filter @t and pFy, and the curves LPF Q and BPFI in FIG.

They each illustrate examples of passband characteristics of a low-pass filter LPF Q, a bandpass filter BPFI, and the like.

The output signal from the low-pass filter LPF Q, whose cutoff frequency is illustrated as fu in FIG.
1, and the f-band filter BPF extracts a modulated color signal based on the fundamental wave existing around the spatial frequency fl determined by the repeating pattern of the filter strips in the color separation striped filter F. It is supplied to the output terminal 12 and to the phase comparison circuit PCOMP and the frequency comparison circuit FCO.

A resettable oscillator O is connected to the phase comparator circuit pcOMP and the frequency comparator circuit FCOMP to which the modulated color signal based on the fundamental wave extracted by the bandpass filter 8PF is supplied.
An oscillation wave generated at 3C is supplied.

The above-mentioned resettable oscillator O3C generates a frequency approximately equal to the frequency of the fundamental wave existing in the vicinity of the spatial frequency f1 determined by the pattern of the filter strips in the color separation striped filter F in the output signal of the image pickup tube 2. An oscillation wave having a fixed oscillation phase and an oscillation phase whose oscillation phase is determined by being reset by a horizontal synchronization signal is used.

Therefore, the phase comparator circuit PCOMP and the frequency comparator circuit FCOMP compare the frequency of the fundamental wave signal component in the output signal of the image pickup tube and the oscillation wave from the resettable oscillator O5C, and the phase comparison result. Output each.

The output signal from the phase comparison circuit PCOMP is sent to the gate circuit G.
pl to the deflection circuit DHFC, and also to the adder ADD via the gate circuit Gp2, and the output signal from the frequency comparison circuit FCOMP is supplied to the adder ADD via the gate circuit Gf. , the output signal from the adder ADD is supplied to a deflection circuit DHFC.

The gate circuits Gpl, GP2. Gf is given respective gate signals via respective control terminals 13, 14, and 15. The gate signal supplied to the control terminal 13 of the gate circuit Gpl is provided in the optical path up to the photoelectric conversion unit 4 of the image pickup tube 2, and is indicated by the symbol P1 in the index signal generation pattern shown in the second diagram, for example. An image pickup tube output signal having a timing such that the gate circuit Gpl can extract the image pickup tube output signal at the time when the electron beam is scanning the part where the electron beam is scanned is used, and is also supplied to the control terminal 14 of the gate circuit Gp2. The gate signal is provided in the optical path up to the photoelectric conversion unit 4 of the image pickup tube 2. For example, the gate signal is provided at the time when the electron beam is scanning the part indicated by the symbol P2 in the index signal generation pattern as shown in the second diagram. The gate circuit Gp2 has a timing such that the image pickup tube output signal can be extracted by the gate circuit Gp2, and the gate signal supplied to the control terminal 15 of the gate circuit Gf is connected to the photoelectric conversion section of the image pickup tube 2. For example, the gate circuit Gpl extracts the image pickup tube output signal at the time when the electron beam is scanning the part indicated by the symbol f in the index signal generation pattern shown in the second diagram, which is provided in the optical path up to 4. 6 Therefore,
The signal supplied from the gate circuit GPI to the deflection circuit DEFC is an error signal between the initial phase of the fundamental wave signal component in the output signal of the image pickup tube and the phase of the oscillation wave from the resettable oscillator O3C, and , the output signal from the gate circuit Gf and the output signal from the gate circuit Gp2 are added by the adder ADD, and the output signal from the gate circuit Gf is added to the deflection circuit DHF.
The signal supplied to O
This is an error signal between the frequency of the oscillation wave from 3C and the frequency of the oscillation wave from 3C.

The deflection circuit DHFC to which the above-mentioned phase error signal and frequency error signal are supplied changes the manner in which the electron beam is deflected in a direction in which the frequency error signal supplied thereto becomes zero, and also changes the direction in which the electron beam is deflected. The phase error signal causes the deflection to be such that good centering can be obtained.

Output terminal 6°11 in the color imaging device shown in the first diagram;
12, for example, the circuit arrangement following the low-pass filters LPFy, LPFΩ, and BPF in the color imaging device shown in FIG.
Low-pass filter L in each embodiment of the color imaging device shown in No. 22383, Japanese Patent Application No. 59-229751, etc.
A circuit layout with the same configuration as the circuit layout following PFy, LPF u, and BPF (however, the time constant of each time constant circuit provided in the circuit layout is based on Japanese Patent Application No. 59-2297)
51) is connected, a predetermined color image signal can be generated.

(Effects) As is clear from the above detailed explanation, the color imaging device of the present invention consists of repeating a specific arrangement pattern of a plurality of types of color stripes, each having a predetermined strip width, and Color separation stripes in which the colors of each of the plurality of color strips are set so that the phase of the fundamental wave component of the image pickup tube output signal, which is determined in accordance with the repetition of the array pattern, changes depending on the color of the light. a filter is provided in the optical path up to the photoelectric conversion section of the image pickup tube, and an optical image of the object to be imaged is provided to the photoelectric conversion section of the image pickup tube via the color separation striped filter; A storage device capable of arbitrarily storing information signals corresponding to at least one frame period of the output signal from the wI picture tube is provided, and prior to imaging, an arbitrary specific color is imaged and the image pickup tube output signal is stored. An information signal corresponding to at least one frame period of A color imaging device that demodulates a predetermined color signal from an output signal by synchronous detection or the like, and an index signal that corresponds to the mode of scanning by the electron beam when scanning by the electron beam in the photoelectric conversion section of the image pickup tube. A signal generation pattern is provided in the optical path up to the photoelectric conversion unit in the image pickup tube, and frequency information in electron beam scanning and the electron beam are determined from the index signal generated in the output signal of the image pickup tube. In a color imaging device configured to obtain initial phase information for each horizontal scanning period in scanning, the image pickup tube output is determined in accordance with the repetition of the arrangement pattern of color strips in the color separation striped filter described above. A reference oscillator capable of oscillating an oscillation wave having a frequency substantially equal to the frequency of the fundamental wave component of the signal and a predetermined phase, the frequency and phase of the oscillation wave output from the reference oscillator, and the imaging described above. A frequency comparing means and a phase comparing means respectively comparing the frequency and phase of the index signal generated in the output signal of the image pickup tube, and based on the respective comparison results by the frequency comparing means and the phase comparing means. The deflection circuit of the image pickup tube is controlled so that the frequency and phase of the index signal generated in the output signal of In the color imaging device of the present invention, the frequency and phase of the index signal generated in the output signal of the imaging tube are the same as the frequency of the oscillation wave output from the reference oscillator. Since the color image pickup apparatus of the present invention satisfactorily solves the above-mentioned problems of the conventional art, the color image pickup apparatus of the present invention satisfies the above-mentioned problems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the color imaging device of the present invention, FIG. 2 is a diagram showing a pattern area for index signal generation, and FIG. 3 is a color separation stripe used in the color imaging device of the present invention. FIG. 4 is a diagram showing an example of the frequency distribution of an output signal from an image pickup tube, and FIG. 5 is a block diagram of a conventional color imaging device. ○...Imaging object, l...Imaging lens, 2... Image pickup tube, 3... Deflection yoke, 4... Photoelectric conversion section of image pickup tube (target having a photoelectric conversion surface), F. ...Color separation striped filter, 5...Front plate of image pickup tube, 6-16...
・Terminal, PrA... Preamplifier, LPyF, LP
F Q...Low pass filter (low pass filter), BP
F...bandpass filter (bandpass filter), MA...storage device, DEFC...deflection circuit, MTX...matrix circuit, O20...resettable voltage controlled oscillator, PCOMP...phase comparison Circuit, FCOMP...
Frequency comparison circuit, N...One-shot multivibrator, 5DETI, 5DHT2...Synchronized detection circuit, SSG...Reference signal generator, ADD...Adder, Gp, Gpl, Gp2. Gf...gate circuit, FC
ONVI, FCONV2 --- Frequency conversion circuit, 1 ~
゛) °2ri・

Claims (1)

[Claims] The phase of the fundamental wave component of the image pickup tube output signal is determined by repeating a specific array pattern of multiple types of color strips, each having a predetermined strip width, and the phase of the fundamental wave component of the image pickup tube output signal is determined in accordance with the repetition of the array pattern. A color separation striped filter, in which the colors of the plurality of color strips are set so as to change depending on the color, is provided in the optical path to the photoelectric conversion section of the image pickup tube, and the light of the object to be imaged is A configuration arrangement that allows an image to be applied to a photoelectric conversion section of an image pickup tube via a color separation striped filter, and a memory capable of arbitrarily storing an information signal corresponding to at least one frame period of an output signal from the image pickup tube. A device is provided, which images an arbitrary specific color prior to imaging and stores an information signal corresponding to at least one frame period of the image pickup tube output signal in the storage device; A color imaging device that obtains a reference signal for color signal demodulation based on an information signal stored in the image pickup tube, and demodulates a predetermined color signal from an output signal of an image pickup tube by synchronous detection or the like, A signal generation pattern is provided in the optical path up to the photoelectric conversion section of the image pickup tube so as to generate an index signal corresponding to the mode of scanning by the electron beam when the photoelectric conversion section of the image pickup tube is scanned by the electron beam. In a color imaging device, frequency information in electron beam scanning and initial phase information for each horizontal scanning period in electron beam scanning are obtained from the index signal generated in the output signal of the image pickup tube. , can oscillate an oscillation wave having a frequency approximately equal to the frequency of the fundamental wave component of the image pickup tube output signal and a predetermined phase, which is determined in accordance with the repetition of the arrangement pattern of the color stripes in the color separation striped filter. a reference oscillator; frequency comparison means for comparing the frequency and phase of the oscillation wave output from the reference oscillator with the frequency and phase of the index signal generated in the output signal of the image pickup tube; The frequency and phase of the index signal generated in the output signal of the image pickup tube are outputted from the reference oscillator based on the comparison results by the phase comparison means, the frequency comparison means, and the phase comparison means. A color imaging device comprising means for controlling a deflection circuit of an image pickup tube so that the frequency and phase of the oscillation wave match each other.