JPH01101782A - Video camera - Google Patents

Abstract

PURPOSE:To control the timing reading an electric charge stored in an image pickup element by providing a means controlling the timing to read the electric charge stored in the image pickup element of a video camera. CONSTITUTION:An image pickup element 2 is driven by a clock signal given from an SSG 3 and the picked-up stored electric charge is read according to a pulse given to XSG1, XSG2. The stored electric charge and the clock signal from the SSG 3 are fed to a signal processing circuit 6, converted into the video signal and fed to a still picture recording and reproducing device 9. In receiving a trigger pulse from a strobo light detector 7, the still picture recording and reproducing device 9 records one field or one frame of the video signal. A flip-flop 8 gives a pulse leading at the same time as a trigger pulse of the strobo light detector 7 and trailing at the succeeding first signal PG to one terminal of OR circuits 4, 5 as a DIS signal. Since the pulse of reading the picked-up electric charge is not given to the XSG1 and XSG2 for the period of the DIS signal, no picked-up charge is read, resulting that the still picture at the moment of the strobo lighting is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a video camera suitable for taking still images.
More specifically, the present invention relates to a video camera that can control the timing of outputting a mirrored image.

(Background of the Invention) In recent years, still image recording and reproducing apparatuses have been developed that miniaturize magnetic disk recording apparatuses and record and reproduce still images by combining them with video cameras. If the recording timing of an image signal recorded in such a still image recording/reproducing device can be synchronized with the photographing timing of a film camera, the same photographed still image as that of a film camera can be reproduced on a monitor television or the like. Therefore, it is possible to check the photographic results without developing or printing the film.

FIG. 4 is a timing chart showing the timing of field photography using such a conventional device. The signal accumulated by the video camera in the accumulation period A is read out at the timing of the video signal a, and the signal accumulated in the accumulation period B is read out at the timing of the video signal i. Also, the signal PG for each track of the still image recording and reproducing device is the vertical synchronization signal ys given to the video camera.
It is set to 7 horizontal periods of y'nc (7PI > before.Here, when the strobe of the film camera fires at the timing (d), the image accumulated during the accumulation period A becomes brighter due to the strobe light emission.Stationary The image recording and reproducing device performs recording from the rise of PG immediately after the strobe light emission until the rise of the next PG, that is, as shown in (e).This period corresponds to the video signal a, and is recorded when the strobe light is emitted. Images can be recorded.

FIG. 5 is a timing diagram showing the timing of frame photography of a similar device. Explanation of the same parts as in field photography will be omitted. Here, when the strobe of the film camera emits light at the timing (d), the images accumulated during the accumulation periods A and B become brighter. The still image recording and reproducing device records video signals a and b as frame images from the rise of PG immediately after the strobe light is emitted to the rise of PG two fields later, that is, as shown in (E).

(Problems to be Solved by the Invention) In such a device, in the case of field photography, if the strobe fires at the timing shown in FIG.
Recording is performed with a delay of one field as shown in FIG. In this case, even though the strobe emits light during the accumulation period A,
A video signal @b corresponding to the accumulation period B after the field is recorded. In other words, a dark image is recorded one field after the strobe-irradiated image, which is out of synchronization with the strobe photography of the film camera. Similarly, in the case of frame photography, if the strobe fires immediately after PG as shown in FIG. 5(f), recording is performed with a one-field delay as shown in FIG. In this case, the strobe has an accumulation period of A
Even though light is emitted during periods B and B, video signals S and C corresponding to accumulation periods B and C are recorded. That is, the video signal C is bright due to strobe light emission, and the video signal C is dark without strobe light emission, resulting in an image with strong flicker.

This means that the PG of the still image recording and reproducing device is V5y of the image sensor.
This is because it is 7H before nc, and the break of the accumulation period is several hours after ■5ync.If the timing of strobe photography is arbitrary, such an asynchronous state of recording is <10~
15)/262.5 probability of occurrence.

This problem is caused by the fact that the timing at which charges are read out from the image sensor of the video camera and the timing at which they are recorded do not match, and the timing at which charges are read out from the l#1m element cannot be controlled.

The present invention has been made in view of these problems, and its purpose is to realize a video camera that can control the timing of reading out the charges accumulated in the ll1llt element.

(Means for Solving the Problems) The present invention, which solves the above problems, includes a charge storage type ME element, a readout means for reading out the charges accumulated in the FFI image element, and a readout means. A video camera comprising a signal processing means for converting the accumulated charge into a video signal and outputting it, further comprising a readout timing control means for prohibiting the readout means from reading out the charge accumulated in the image sensor for a certain period of time. This is a characteristic feature.

(Function) For a certain period of time, it is prohibited to read out the charges accumulated in the m element. After the read prohibition is released, the accumulated charges are read out.

<Examples> Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of electrical groove formation according to the present invention together with a still image recording and reproducing apparatus. In the figure, 1 is a video camera, 2 is an lll1a element, 3 is a clock signal generator, and 5SG14 is a logical sum of X5GIO of 5SG3 and the output of a flip-flop, which will be described later.
1 is an OR circuit, 5 is an OR circuit that performs the logical sum of X5G10 of 5SG3 and the output of a flip-flop, which will be described later, and supplies it to XSG2 of image sensor 2, and 6 is an OR circuit that converts the charge imaged by the IIi image element into a video signal. signal processing circuit to convert,
7 is a strobe light detector that detects strobe light and generates a trigger pulse; 8 is a strobe light detection trigger that is set by the pulse and reset by the PG from the still image recording/reproducing device, and sends its output to the OR circuit 4.5; 9 is a still image recording and reproducing device that records the video signal from the video camera 1 as a still image using a pulse from a strobe photodetector; 10 is a monitor television for reproducing the still image.

Next, the operation of this embodiment will be explained. The M camera element 2 captures the same subject (not shown) as a film camera (not shown) at 1f.
It is set to fitll. This image sensor 2 is driven by a clock signal given from 5SG3, and the imaging accumulated charges of odd and even fields are read out according to pulses given to X5G1 and X5G2. This accumulated charge and the clock signal from 5SG3 are supplied to the signal processing circuit 6, converted into a video signal, and supplied to the still image recording/reproducing device 9. When the still image recording/reproducing device 9 receives a trigger pulse from the strobe photodetector 7, it records one field or one frame of a video signal. The flip-flop 8 outputs a pulse that rises simultaneously with the trigger pulse of the strobe photodetector 7 and then falls at the first PG to one end of each OR circuit 4.5.
It is given as an IS signal. As a result, the pulse for reading out the 1lil image charge is applied to X5G1.
Since it is not applied to X5G2, the imaging charge is not read out and remains accumulated. As a result, the strobe changes from PG to
Even if the flash is emitted at a timing between 5GI and
Since it is read out after the field, a still image at the moment of strobe light emission can be recorded. In this video camera 1, the image sensor continues to accumulate charge while the DIS signal is being applied, so by applying an arbitrary signal to the DIS signal, it is possible to capture low-brightness objects (for example, starry skies, night scenes, etc.) still. It can also be used to take pictures. Incidentally, in this case, the flip 70 is not necessary, and it is sufficient to apply a signal that remains at a high level during the period of continued accumulation as a DNS signal.

The operation will be explained in detail below using FIG. 2.

FIG. 2 is a timing chart showing the operation of each part in the case of field recording in this embodiment. The storage period of the ll1l image element 2 has the timing as shown in FIG. 2(a), and Δ, B, C, . . . are periods corresponding to one field, respectively. Here, it is assumed that the strobe emits light at the timing shown in (c), that is, before the PG of the accumulation period B. As a result, the flip-flop 8 transmits the pulse shown in (d) to D from the time of strobe light emission to the rise of PG.
It is supplied to OR circuits 4 and 5 as an IS signal. ll! 1f
iJ! X5G1 of element 2. The negative polarity pulse for reading the imaged charge is directly applied to X5G2. For this reason, lI
Imaging charges are read out from the i-image element 2 at normal timing, converted into video signals by the signal processing circuit 6, and supplied to the still image recording/reproducing device 9. When the still image recording and reproducing device 9 receives a trigger pulse from the strobe photodetector 7, it records a video signal in synchronization with the subsequent PG double signal as shown in (h). In this case, a video signal corresponding to an image captured during the accumulation period B during which the strobe light is emitted is recorded.

Next, a case will be described in which the strobe emits light at the timing shown in FIG. 2, that is, after the PG signal of the accumulation period B. Flip 70 knob 8 is the next P when the strobe fires.
Until the rise of G, a pulse as shown in (J) is supplied to the OR circuit 4.5, and during this period, as shown in (R) and (W), X5G1. A negative polarity pulse for reading the imaged charge is not supplied to X5G2. Therefore, the accumulated charges during the accumulation period B are not read out from the image sensor 2 and continue to be accumulated. A negative polarity pulse for reading out charges is supplied to the image sensor 2 at the timing of the next field, and both the charges in the accumulation period B and the charges in the accumulation period C are read out. This charge is converted into a video signal b' by the signal processing circuit 6 and supplied to the still image recording/reproducing device 9. The video signal b' is the sum of the video signal S and the video signal C, but since the level of the video signal C is small, the video signal b' is the same as a still image at the moment of flashing the strobe light. In other words, the strobe is
As shown in the figure, since the flash is emitted immediately after the PG multiplied signal in the accumulation period B, recording in the still image recording and reproducing device 9 is performed with a one-field delay, but the video signal when the strobe is emitted is also output with a one-field delay. Therefore, the same as the strobe shadow.
It becomes possible to record still images. Therefore, according to the present invention, regardless of the timing at which the strobe emits light, it is possible to reliably record a still image in synchronization with the strobe action of the film camera.

FIG. 3 is a timing chart showing the operation of each part in frame recording. Description of parts that overlap with the description of FIG. 2 will be omitted. In frame recording, Figure 3 (e),
As shown in (v), the am element is configured to accumulate and alternately read out data during two field periods for both odd and even fields. Here, as shown in (b), if the strobe emits light before the PG multiplied signal in the accumulation periods B and C, the PG multiplied signal two fields later, including the immediately subsequent PG multiplied signal,
The still image recording/reproducing device 9 records the double signal. That is,
Video signals S and O at the time of strobe light emission are recorded in the still image recording and reproducing device 9.

If the strobe emits light after PG in the accumulation periods B and C as shown in (h), the recording timing will be delayed by one field as shown in (b). At this time, the flip-flop 8 supplies the OR circuit 4.5 with a pulse having a width from the time of strobe light emission to the rise of the next PG times signal as a DNS signal, and prohibits the stored charge from being read out from the image sensor during this period. do. As a result, the accumulated charges in the accumulation period B are read out together with the charges in the accumulation period, and are converted by the signal processing circuit 6 into a video signal b' and supplied to the still image recording/reproducing device 9. As described above, the video signal b' is the same as the still image during the accumulation period B during strobe light emission. In other words, since the timing of strobe light emission is immediately after the PG signal, recording in the still image recording/playback device @9 is delayed by one field, but the signal of the first field of the video signal when the strobe light is emitted is delayed by two fields. Since the video signal C9 is output as the video signal b', the video signal C9 is output as the video signal b'.
Frame recording of still images is performed in this order. Therefore, according to the present invention, it is possible to reliably record still images in synchronization with strobe photography by a film camera, no matter what timing the strobe fires.

Incidentally, the flip 70 tube can be built into either the still image recording and reproducing device 9 or the video camera 1. If it is built into the video camera 1, there is no need to modify the still image recording and reproducing device 9, making it a simple process. You can take synchronized shots with the composition.

(Effects of the Invention) As described above in detail, according to the present invention, by providing means for controlling the timing of reading out the charges accumulated in the image sensor of the video camera, the charges accumulated in the image sensor can be read out. It is possible to realize a video camera that can control the timing of reading out.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the electrical configuration of the present invention, and FIG.
The figure is a timing chart showing a case where field photography is performed using the device of the present invention, Figure 3 is a timing chart when frame photography is performed using the device of the present invention, and Figure 4 is a timing chart showing a case where field photography is performed using a conventional device. FIG. 5 is a timing chart showing the case in which the frame Il is
! 12 is a timing chart showing a case where 1 shadow is performed. 1...Video camera 2...Image sensor 3...S
SG 4.5...OR circuit 6...Signal processing circuit 7...Strobe photodetector 8...Flip-flop 9...Still image recording and reproducing device 10...Monitor TV patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent Attorney Fuji Ijima 1 person Figure 2 (a) Accumulation period -A +=-B-, 1. -C-=(-
-D-+-E-(su) Strobe (power) REC

Claims (3)

[Claims] (1) A video device consisting of a charge storage type image sensor, a readout means for reading out the charge accumulated in the image sensor, and a signal processing means for converting the charge read out by the readout means into a video signal and outputting it. 1. A video camera characterized in that the camera is provided with readout timing control means for prohibiting the readout means from reading out charges accumulated in an image sensor for a certain period of time. (2) The video camera according to claim 1, wherein the readout timing control means is configured to prohibit readout of charges during a period when a signal is applied from the outside. (3) A patent claim characterized in that the read timing control means is configured to prohibit readout of charges by a signal applied from an external source, and cancel the prohibition of readout of charges by a signal applied from another external device. A video camera according to item 1 of the scope of the invention.