JPH0721940B2 - Information recording / reproducing device - Google Patents

Description

The present invention relates to an information recording / reproducing apparatus, and more particularly to information recording / reproducing for recording modulated data on an information recording medium and / or demodulating data from the information recording medium. Regarding the device.

[Prior Art] Conventionally, various forms such as a disc, a card, and a tape are known as forms of an information recording medium for recording information by using light, magnetism, etc. and reading the recorded information. .
Among these, a card-shaped optical information recording medium (hereinafter referred to as an optical card) is expected to be in great demand as a medium having a large recording capacity that is small and lightweight and convenient to carry.

FIG. 12 is a schematic plan view of the optical card, and FIG. 13 is a partially enlarged view thereof.

In FIG. 12, 1 is an optical card, 3 is an information track, and 2
Is the home position. The optical card 1 is modulated according to recording information, and information is recorded as an optically detectable recording pit row (information track) by scanning a light beam focused on a minute spot on the optical card. . At this time, in order to record and reproduce information accurately without causing troubles such as crossing of the information tracks 3, the irradiation position of the light beam is controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT). Must be called). In addition, it is necessary to control in the direction perpendicular to the optical card (autofocusing, hereinafter referred to as AF) in order to stably irradiate a minute spot in spite of bending of the optical card and mechanical error.

Next, the recording / reproducing method of the optical card will be described with reference to FIG.

Initially the light beam is in home position 2. Next, the light beam moves in the direction of D in the figure, finds the information track 3N to be recorded or reproduced, and moves on the information track 3N to F in the figure.
Information is recorded or reproduced by scanning in the direction.

Here, as a means for detecting whether or not it is a target information track, as shown in FIG. 13, a track number is recorded in advance on an extension of the tracking track 5 (51, 52, ...). A track number recording area (hereinafter referred to as preformat) 4 is provided, the recorded track number is read, and the contents are inspected to determine whether or not the track is the target track, or the information track 3 ( (31, 32, ...) The data to be written including the track number is recorded as the write data. To detect the track number, the information track is played once and then the track number part is extracted and compared with the target track number. Has been adopted.

[Problems to be Solved by the Invention] The recording / reproducing speed of the information recording medium will be further improved due to future progress. Along with that, various modulation / demodulation methods should be adopted depending on how the medium is used. In the above-mentioned conventional recording / reproducing method, since no consideration is given to such a point, there is a problem that compatibility is difficult to be obtained when various information recording media are used.

[Means for Solving the Problems] The above-mentioned problem is an information recording / reproducing apparatus that records modulated data on an information recording medium and / or demodulates data from the information recording medium, wherein the apparatuses are different from each other. It is possible to perform recording and / or reproduction using a plurality of types of information recording media in which data is recorded by a modulation method, and a determination means for determining the modulation method corresponding to each of the media, and a determination means of the determination means. And a selection means for selecting a predetermined modulation method based on the determination result,
The discrimination means is a modulation in which a pattern consisting of a predetermined number of bits is repeated, and the format is different from the modulation method in which the data is recorded and which can be processed only by software without using a circuit for reproducing / demodulating the data. The recognition information recorded by the method is read, the patterns in the recognition information are compared, and when there are a plurality of identical patterns, the patterns are recognized as medium type recognition information for determining the type of the medium, and the modulation is performed. This is solved by the information recording / reproducing apparatus of the present invention characterized by discriminating the system.

Here, the information recording / reproducing device means a device for recording only, reproducing only, or recording and reproducing.

[Operation] According to the present invention, a pattern having a predetermined number of bits is repeated, the format is different from the modulation method in which the data is recorded, and the data can be processed only by software without using a circuit for reproducing / demodulating the data. When the recognition information recorded in a different modulation method is read, the recognition information in which the pattern in the recognition information is repeated is compared, the patterns in the recognition information are compared, and when the same pattern exists,
The discriminating means for recognizing the pattern as the medium type recognition information for discriminating the medium type discriminates the modulation method corresponding to each medium, and the selecting means selects a predetermined modulation method based on the discrimination result of the discriminating means. By recording and / or reproducing information, it is possible to surely determine the modulation method for various media and record and / or reproduce information.

EXAMPLES Examples of the present invention will be described below in detail with reference to the drawings.
An information recording / reproducing apparatus used for an optical card will be described as an example of the information recording / reproducing apparatus of the present invention. In the following description, the same members will be denoted by the same reference numerals.

First, the basic structure of the optical card and the structure of the optical head unit will be described.

FIG. 2 is a schematic plan view of the optical card.

In the figure, the optical card 1 has tracking tracks 5 (51, 52, ...) Preliminarily formed in a continuous linear shape.
Are evenly spaced. And a data recording section 6 for recording information for each tracking track.
(61, 62, ...) are provided. That is, optical card 1
Has a data recording portion between all the tracking tracks.

FIG. 3 is an explanatory diagram relating to the configuration of the optical head section of the information recording / reproducing apparatus.

FIG. 4 is an explanatory diagram showing a light beam emitted onto the optical card.

FIG. 5 is an explanatory diagram showing the structure of the photodetector.

A light beam emitted from a light source 7 such as a semiconductor laser is collimated by a collimator lens 8 and is collimated by a diffraction grating 10.
Divided into book beams. These light beams are imaged by the objective lens 17 on the tracking tracks 51, 52 and the data recording section 61 on the optical card 1 as shown in FIG. 4, forming beam spots S1, S2, S3, respectively. Here, the optical card 1 is moved in the direction of arrow R by a driving means (not shown), and is scanned by the beam spot in the direction in which the tracking track extends. The reflected light of the beam spots S1, S2, S3 again passes through the objective lens 17, is reflected by the beam splitter 11, and is projected by the condenser lens system 12 onto the photodetectors 13, 14, 15 respectively. Condensing lens system
Reference numeral 12 is an astigmatism system, and is an example arranged so that autofocusing can be performed by a well-known astigmatism method. These photodetectors are arranged in the arrangement shown in FIG. 5, and the photodetector 14 has four components like A, B, C and D.
It is divided. In FIG. 3, 9 is a prism for converting the cross-sectional distribution of the collimated light beam emitted from the semiconductor laser from an ellipse into a circle, and 16 is an objective lens 17
It is a mirror that guides the luminous flux to. Next, the operation of recording information on the optical card using the above-mentioned device will be described with reference to FIG. First, when information is recorded in the data recording section 61, the beam spots S1, S2, and S3 are applied to the tracking track 51, the data recording section 61, and the tracking track 52, respectively. These beam spots are scanned in the direction of arrow F by the movement of the optical card 1 as described above. The reflected light from the beam spot S1 enters the above-mentioned photodetector 13, and the reflected light from the beam spot S3 enters the photodetector 15, and the tracking signal is detected by the so-called three-beam method. That is, when the beam spots S1 and S3 deviate from the tracking tracks 51 and 52, a difference occurs in the light intensity incident on the photodetectors 13 and 15, and a tracking signal can be obtained by comparing the signals from these light receiving surfaces. Is. Based on this tracking signal, the beam spots S1, S2, S3 are moved in the direction (D direction) perpendicular to the scanning direction by a tracking means (not shown) (for example, means for moving the objective lens 17 in the Z direction in FIG. 3). Moved together, AT
Is done. The beam spot is displayed on the data recording section 61.
The recording pit 18 is accurately recorded along the tracking tracks 51 and 52 by S2.

Next, the structure of the optical card used in the present invention will be described.

FIG. 6 is a schematic plan view of an example of an optical card used in the present invention.

FIG. 7 is a partially enlarged view of part A in FIG.

As shown in both figures, between tracking tracks 5 (51,5
G mark 19 is provided in 2). This G mark 19
Is a mark for discriminating the reference track, which is pre-formatted at a predetermined position of the optical card.

As shown in FIG. 7, a pattern for recognizing the medium type, which is an auxiliary data portion, is provided on the extension line of the data recording portion having the G mark 19.
20 (hereinafter simply referred to as pattern) is pre-formatted,
Alternatively, it is recorded and formed by a light spot. This pattern has a completely different format from other data recording parts, does not depend on the reading speed, and can be processed only by software without using a circuit to reproduce and demodulate other data recording parts. It is recorded with various modulation methods. This modulation method is a kind of FM modulation method.
The signal detected at (spot S2) is as shown in FIG.
First, the time from the rise of the signal to the next rise is measured N times (twice in FIG. 8), the average value is calculated, and this value is used as the reference time thereafter. Here, "1",
In the judgment formula of "0", t1 is the reference time and the non-measurement time is T
When, for example, T> 2t1, 0, 0.5t1 <T <2t1
If so, it is judged as 1. In order to further improve the certainty, as shown in FIG. 9, the whole is composed of a repeating pattern for every M bits (M = 4 in this embodiment), and every one bit is compared with every M bits. When the same bit pattern continues, the pattern is recognized as a number unique to the medium.

For example, pattern "6" (in this example) is MFM modulated, speed is 1
Pattern “1” is converted to 8-14 at a speed of 200 with a medium of 00 mm / sec.
If the information recording / reproducing device is an MFM modulation type when it is set to mm / sec and the pattern is read at a speed of 100 mm / sec, if the pattern information is “1”, recording / recording is performed according to the pattern information. By setting the playback speed to 200 mm / sec and switching the modulation / demodulation circuit to the 8-14 conversion side,
It is possible to record / play back 14 conversion media. If the device does not have a modulation / demodulation circuit for 8-14 conversion, send information having the meaning of "recording / reproduction impossible" to a higher-level device (not shown) that controls the recording / reproduction device. Alternatively, the recording / playback device is provided with a buzzer, a lamp or the like to notify the operator that "recording / playback is impossible".

In the present embodiment, since the number unique to the medium is recognized as described above, even if a part of the medium type recognition pattern has an error, the medium type can be surely recognized.

The configuration of the information recording / reproducing apparatus of the present invention will be described below.

FIG. 1 is a schematic diagram of a configuration example of an information recording / reproducing apparatus of the present invention.

An information recording / reproducing device (hereinafter referred to as a drive) 21 is connected to a host control device (hereinafter referred to as a CPU) 22 and a drive 2
Data communication and control are performed between 1 and the CPU 22. The MPU 23 in the drive 21 has built-in ROM and RAM, and mainly controls the card feed motor 24 and head feed motor 25, and the AT / AF control circuit 26 receives signals from the photodetectors 13, 14, 15 and performs AF. The actuator 27 and the AT actuator 28 are driven. Further, the modulation / demodulation circuit 29 executes recording by changing the emission intensity of the light source 7 during recording, and demodulates data based on the signal of the photodetector 14 during reproduction. However, when the optical card is inserted, the MPU 23 demodulates and identifies the medium type pattern 20 of FIG.

That is, the MPU 23 serves as a discriminating means for discriminating the type of mounted medium.

FIG. 10 is an explanatory diagram of the modulation / demodulation circuit 29 of FIG.

In the figure, 30 is a modulation / demodulation circuit for MFM, 31 is a modulation / demodulation circuit for 8-14 conversion, and the MPU 23 shown in FIG. 1 is an optical card 1
Depending on the type, a switching signal is sent through the signal line 33b to the switch 32 serving as selection means, the switch 32 is switched, and the modulation / demodulation circuit 30 for MFM or the modulation / demodulation circuit 31 for 8-14 conversion is selected. Also, from the MPU23, both modulation and demodulation circuit 30,
The recording signal is supplied to 31 through the signal line 33a, and the recording signal is modulated by the MFM modulator / demodulator circuit 30 or 8-14 modulator / demodulator circuit 31. This modulated signal drives the optical element (laser diode) through the switch 32. The demodulated signal is a bit serial signal and is sent to the synchronization pattern detection circuit (SPD) 35 and the gap detection circuit (IGD) 34. In the sync pattern detection circuit 35, when the sync pattern in the data recording section is detected, a detection signal is sent to the MPU 23 through the signal line 33c. The gap detection circuit (IGD) 34 detects a gap between a plurality of information blocks in one auxiliary data section.

FIG. 11 is a flowchart showing the control sequence.

The operation is started after inserting the optical card. First, at 500-1, the auxiliary data section is read, and at 500-2, the modulation / demodulation method of the data recording section is determined by the information in the auxiliary data section. Then proceed to 500-6 or 500-7, depending on the information. For example 500-6
When the process proceeds to step 3, the MFM modulator / demodulator circuit 23 is selected at 500-3 to record / reproduce information. After that, the process proceeds to 500-5, determines whether it is a card eject, and if it is not eject, proceeds to 500-8 to continue recording / reproduction, and in the case of eject proceeds to 500-9 to wait for the next card insertion. Similarly, at 500-4, selection / control of the 8-14 modulation / demodulation circuit 29 and recording / reproduction are performed.

As described above, according to the present invention, recording / reproducing can be performed on various media with simple hardware. Further, in FIG. 7, the track on which the medium type recognition pattern exists is arranged on the track with the G mark, but this is because it does not reduce the data recordable area. The effect of the invention does not change.

[Effects of the Invention] As described in detail above, according to the present invention, a pattern consisting of a predetermined number of bits is repeated, and the data is recorded in a format different from the modulation method in which the data is recorded, and the data is reproduced and demodulated. The recognition information recorded by the modulation method that can be processed only by software without using the circuit is read, the patterns in the recognition information are compared, and when there are a plurality of identical patterns, the patterns are classified by the type of medium. The modulation method corresponding to each medium is discriminated by the discrimination means for recognizing as the medium type recognition information, and a predetermined modulation method is selected by the selection means based on the discrimination result of the discrimination means to record and / or record information. Alternatively, by performing reproduction, it becomes possible to identify the medium type, and it is possible to perform recording / reproduction on / from media of various modulation / demodulation methods. Also,
By using the discriminating means as in the present invention, it is possible to recognize even if a part of the medium type recognition information is crushed, and the pattern during data reproduction is not erroneously recognized as the medium type recognition information. The recognition becomes more certain. Furthermore,
Since the medium type recognition information is recognized without passing through the modulation / demodulation circuit, the medium type can be surely recognized regardless of the modulation method of the information recording / reproducing apparatus. As a result, an information recording / reproducing device having excellent versatility can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a configuration example of an information recording / reproducing apparatus of the present invention. FIG. 2 is a schematic plan view of the optical card. FIG. 3 is an explanatory diagram relating to the configuration of the optical head section of the information recording / reproducing apparatus. FIG. 4 is an explanatory diagram showing a light beam emitted onto the optical card. FIG. 5 is an explanatory diagram showing the structure of the photodetector. FIG. 6 is a schematic plan view of an example of an optical card used in the present invention. FIG. 7 is a partially enlarged view of part A in FIG. FIG. 8 is a waveform diagram for explaining an example of the structure of the medium type recognition pattern. FIG. 9 shows another example of the medium type recognition pattern. FIG. 10 is an explanatory diagram of the modulation / demodulation circuit 29 of FIG. FIG. 11 is a flowchart showing the control sequence. FIG. 12 is a schematic plan view of an optical card. FIG. 13 is a partially enlarged view of the optical card shown in FIG. 1 …… Optical card 7 …… Light source 13,14,15 …… Photodetector 21 …… Drive 22 …… CPU 23 …… MPU 24 …… Card feed motor 25 …… Head feed motor 26 …… AT / AF control Circuit 27 …… AF actuator 28 …… AT actuator 29 …… Modem circuit

Claims (1)

[Claims] 1. An information recording / reproducing apparatus for recording modulated data on an information recording medium and / or demodulating data from the information recording medium, wherein the apparatus is of a plurality of types in which data are recorded by different modulation systems. It is possible to perform recording and / or reproduction by using an information recording medium, and a discriminating means for discriminating a modulation system corresponding to each medium, and a predetermined modulation system is selected based on the discrimination result of the discriminating device. And a selection means to
The discrimination means is a modulation in which a pattern consisting of a predetermined number of bits is repeated, and the format is different from the modulation method in which the data is recorded and which can be processed only by software without using a circuit for reproducing / demodulating the data. The recognition information recorded by the method is read, the patterns in the recognition information are compared, and when there are a plurality of identical patterns, the patterns are recognized as medium type recognition information for determining the type of the medium, and the modulation is performed. An information recording / reproducing apparatus characterized by discriminating a method.