JPH01149236A - Optical information recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical information recording/reproducing apparatus for recording and/or reproducing information on an optical information recording medium. In particular, the present invention is suitable for an optical card recording/reproducing device that records and reproduces information while relatively reciprocating an optical head and an optical card.

[Prior Art] Various media such as optical discs, optical cards, and optical tapes have been known as media for recording and reproducing information using light. Each of these has its own characteristics and is used depending on the purpose and application. Among them, optical cards are easy to manufacture, easy to carry, and easy to access, so their uses will continue to expand in the future. It is thought that it will go.

FIG. 7 is a schematic block diagram showing an example of an optical information recording device configured for the card-shaped recording medium.

In the figure, 1 is an optical card on which information is to be recorded, 3 is an optical head (the part surrounded by a dotted line in FIG. 7), 4 is a light beam, 5 is a shuttle for placing the optical card l, and 8 is a laser. The light source 9 is a collimator lens. The polarizing beam splitter 130 is a 174-wavelength plate, and the combination of these two members allows light to be transmitted downward from I in the figure, but light directed from I to H in the figure is bent in the right angle direction.

Reference numeral 11 denotes an objective lens which serves to condense parallel light onto an optical card 1''2.

12 is an optical sensor, 13 is a preamplifier, 14 is an autofocusing servo, 15 is an autotracking servo, 16 is a decoder, 17 is an interface, 18 is a computer, 19 is an encoder, 20 is a laser driver, 2+ is a stepping motor and an optical head 3 in the direction perpendicular to the page.

Reference numerals 22 and 23 indicate pulleys, and a belt 24 is looped around the pulleys 22 and 23. The optical card 1 is attached to the belt 24.
A shuttle 5 is attached for moving and fixing 1iV1. The pulley 22 is attached to the shaft of a motor 26, and the rotation of the motor 26 causes the optical card l to reciprocate in the direction of the arrow in the figure.

Next, the operation of the apparatus shown in FIG. 7 will be explained using the case of information reproduction as an example.

In FIG. 7, the light beam oscillated from the laser 8 is turned into parallel light by the collimator lens 9, and the polarizing beam splitter 10 and ! The light passes through the 74 wavelength plate 30 and is further focused by the objective lens 11 to form a minute spot on the optical card l. The reflected light from the optical card 1 is modulated depending on whether or not there is an information bit in the area irradiated by the minute spot, and this modulated light is returned to the objective lens 11.
The light becomes parallel light, and is incident on the optical sensor 12 by the polarizing beam splitter 10. The optical sensor 12 detects the change in the modulated light J11, converts it into an electrical signal, and sends it to the preamplifier +3. A signal is sent from the preamplifier 13 to the autofocusing servo 14, and based on the signal from the autofocusing servo 14, an actuator (not shown) moves the objective lens 11 in the direction B, and the light beam 4 is focused on the optical card 1. The distance between the objective lens II and the optical card 1 is controlled as follows.

The signal from the preamplifier 13 is also sent to an auto-tracking servo 15, and the signal from the auto-tracking servo 15 causes an actuator (not shown) to move the objective lens 11 in a direction perpendicular to the plane of the drawing, and the light beam 4.
control to focus on a predetermined position. Note that during the initial operation of the device, the autofocusing servo 14 and the autotracking servo 1 are transmitted from the interface 17.
5 Servo pull-in city is sent. Several specific methods have been proposed for the auto-focusing servo 14 and the auto-tracking servo 15, but for example, the light beam 4 can be divided into multiple parts using a grating or the like, and an optical card! An example of preformatting a track for autofocusing or autotracking in advance, reproducing information with at least one of a plurality of light beams, and extracting signals for autofocus and autotracking with other beams. is proposed. Furthermore, the signal from the preamplifier 13 is sent to the decoder +6 and subjected to necessary electrical processing, and then sent to the interface 1.
Sent to 7.

Information signals are sent from the interface 17 to the computer 18 . Further, a signal is sent from the interface 17 to an encoder 19, modulated as necessary, and then passed through a laser driver 20 to control the oscillation of the laser 8.

Furthermore, signals are sent from the interface 17 to a stepping motor 21 and a motor servo 27, which control the position of the optical radar 3 in a direction perpendicular to the plane of the paper and the rotation of the motor 26, respectively.

An optical card recording and reproducing apparatus that operates as described above is required to be reliable enough to stably and accurately record information on the optical card. Recording stably means
For example, if there is a defect such as a scratch or dust on the surface or recording surface of an optical card, there is a low possibility that the presence of the defect will cause information to be erroneously recorded on a track other than the information track where information should originally be recorded. That is what it means. For such ammonium water, a method as shown in FIG. 8 has been proposed for conventional apparatuses in which a medium such as an optical disk rotates in one direction with respect to an optical head. In FIG. 8, reference numeral 41 denotes an information track, and on the same information track there is a first spot 42 for recording and reproducing information, and a spot 44 for detecting in advance as soon as there is a foreign object 44 on the information track on which information is to be written. A second spot 43 has the role of performing reproduction, and a third spot 45 has the role of performing reproduction in order to immediately determine whether the information recorded as bits 46 is accurate after recording. Therefore, the second
By knowing the existence and size of the defect before recording using the spot 43, for example, auto focusing servo,
By locking the auto tracking servo, the first
It is possible to prevent the spot 43 from moving to another information track. Furthermore, if the information bits 46 recorded by the third spot 45 are reproduced and it is determined whether or not the information has been recorded accurately, it is possible to immediately correct and record the information on a new information track 41 in the event of an error. .

[Problems to be Solved by the Invention] However, when the device having the configuration shown in FIG. 8 is applied to an optical card recording device in which the optical head and the optical card move relatively back and forth, The disadvantage is that the speed is significantly slower. That is, as shown in FIG. 8, if the roles of the second spot and the third spot are determined, recording must be performed during the forward movement (or always during the backward movement). Therefore, for example, in order to perform recording over two information tracks, the optical head and the optical card must make two reciprocal movements. This causes an inconvenient situation in that when recording a large amount of information, it takes a long time to record.

[Means for Solving the Problems] The present invention has been made in view of the problems listed in E. That is,
The purpose of the present invention is to stably record 1 GB without reducing the recording speed.
Another object of the present invention is to provide an optical card recording/amplifying device capable of accurately recording information.

The above object is to provide an optical information recording and/or reproducing apparatus for recording and/or reproducing information while relatively reciprocating the recording and/or reproducing head and the optical recording medium. A plurality of spots formed by the head on the recording medium are arranged so as to be located on the same track in the recording medium, and This is achieved by an optical information recording/reproducing device characterized in that the function of at least one spot among a plurality of spots is changed.

[Function] A feature of the present invention is that the function of at least one spot among the plurality of spots is changed in accordance with the scanning direction during forward movement and backward movement. The purpose is to make the functions function in a predetermined order.

For example, according to the example in 11;1, by switching the functions of the second spot and the third spot,
During forward movement and return movement, it is possible to perform preliminary investigation before recording, information recording, and confirmation operation after recording. Therefore, when recording on two information tracks, one round trip is required. operation, and the recording speed is doubled compared to the conventional example.

[Example] Hereinafter, the optical information recording irS generation device of the present invention will be described in detail based on a specific example.

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

Components having substantially the same function as the configuration of device 6 shown in FIG. 7 are given the same numbers, and their explanations will be omitted.

In FIG. 1, 61 is a diffraction grating, 65 is a sensor lens, 62, 63, and 64 are light spots formed on the optical card, 66 is an optical sensor, and 67, 68, and 69 are the light receiving parts of optical sensor 7, respectively. be.

70, 71, and 72 are preamplifiers, 73 is a switching circuit for switching the functions of the light spot, 74 is a control circuit, and 7
7 is an interface, and 78 is a computer.

In the optical head 3, the collimated beam formed by the collimator lens 9 is converted into three beams by the diffraction grating 61. These three beams are imaged onto the optical card 1 by the objective lens 11 as three spots 62, 63, and 64. This 3
The direction in which the spots are lined up is parallel to the direction in which the optical card 1 performs the gaze movement. The reflected beam from the optical card 1 passes through a quarter-wave plate 30 and a polarizing beam splitter 10, and then is focused by a sensor lens 65 onto an optical sensor 66. The optical sensor 66 has three light receiving sections 67, 68, and 69 corresponding to three beams, and converts a change in the optical meter of each beam into a change in electrical characteristics.

The output from each light receiving section is a preamplifier 70 that supports 1:I.
．． After being sent to 71 and 72 and subjected to predetermined processing, it is passed to a switching circuit 73.

Next, the functions after the switching circuit 73 will be explained using FIG. 2 in conjunction with FIG. 1. FIG. 2 is a diagram showing the arrangement of the optical slots and pots of the optical card "Second Information Track". Second
In the figure, information track 5 l a on which information is to be recorded,
'5' I b, -, 51f are provided parallel to the reciprocating direction of the optical card. As explained in FIG. 1, the three spots 62, 63 and 64 are located on the same information track 51F. Now, consider the case where information is recorded as bit 55 on the information track 5Ib. Three spots 62, 63 . formed by the diffraction grating 61 .
The intensity of 64 is different, at least the intensity of 62 is different from that of 63.
It is larger than that of 64. Recording commands and recording contents from the computer 78 are transmitted to the laser driver 20 via the interface 77 and encoder 19, and drive the laser 8 as a predetermined modulated recording signal. Information is recorded on the information track 5Ib by the spot 62 in response to this modulated recording signal. Spot 64 reads written information immediately after recording. spot 6
The output from the light receiving section 69 and the preamplifier 72 corresponding to 4 is transmitted from the switching circuit '73 to the decoder 16 and is reproduced immediately after recording, and this reproduction information is sent to the interface 77. At the interface 77, reproduction information is compared with information that should originally be recorded.

If it is determined that recording has not been performed normally, a command is issued to perform recording on the adjacent information track 51 cm, for example.

Historically speaking, the confirmation spot 64 itself is also modulated by recording information and clothing, so the interface 77 sends the preamplifier 70.
It is possible to obtain +F accurate information by sending recording modulation information to 7+ and 72, and referring to and supplementing the information within 2 preamplifier 72.

Next, the case where recording is performed on the information tracks 51c and 51h in FIG. 2 will be explained. When recording on the previous information track 51b, information was recorded from left to right in FIG. 2 (tentatively named forward movement), but recording on the next information track 51c is to increase the recording speed. , recording is performed from the cloth to the left in the figure (that is, recording is performed during the backward movement). If there is a relative reciprocating relationship between the optical card 3 and the optical card l during normal playback (for example, in FIG. 2, the device always reads information from left to right during playback), then for example during recording. It is also possible to record one track of information in reverse order. When recording on the information track 51c, the spot 63 is used to confirm immediately after recording. That is,
The interface 77 determines whether the optical card 1 is being fed in the forward direction or backward direction, and transmits this information to the switching circuit 73. This information is also transmitted to the decoder 16 in the clearance switching circuit 73 for the purpose of checking the signal from the preamplifier 72 during the forward movement and the 4A signal from the preamplifier 71 during the backward movement for the purpose of confirmation after recording.

Furthermore, when recording on the information track 51c, the subot 6
Explain the role of 4. The spot 64 monitors the state of the information track 51c just before recording is performed using the spot 62. If any foreign matter/defect 56 exists, its presence appears as a fluctuation in the photoelectricity reaching the light receiving section 69. A signal from the light receiving section 69 is transmitted to a control circuit 74 via a preamplifier 72 and a switching circuit 73. Control circuit 74
Internally, if we consider the output from this switching circuit, its size, continuous time, etc., and decide that it is not suitable,
An instruction is issued to the autofocusing servo 14 and autotracking servo 15 to hold each servo state. This holding time width is, for example, the preamplifier 7
It is sufficient that the signal from 2 passes over the foreign object 56 and is confirmed to have returned to a predetermined level, or until a predetermined period of time has elapsed. This causes spot 62.63 again.
．． 64 can be quickly located on the information track 51c. From the control circuit 74, the information track 51
The interface 77 is informed that there is a foreign substance that has a large effect on the cmh, and that the above control has been performed. The interface 77 uses this signal to record the information on the information track 51d again, or on the assumption that the defect is larger than the width of the information track 51, and records the information on the information track several lines apart. Issue instructions to various locations to record information. −
1. As mentioned above, when recording on the information track 51c (during backward movement), the spot 64 is monitored on the track, but the information track 5 l b ! −.

It is the spot 63 that plays this role when recording to (during forward movement). Therefore, the switching circuit 73 also uses forward and backward movement information from the interface 77, and selects and switches information from the preamplifiers 71 and 72 to control the control circuit 73.
Tell 4.

As is clear from the above description using FIGS. 1 and 2, for an optical card l that moves back and forth.

A spot that performs playback immediately after recording and confirms the recorded information, and a spot that detects abnormalities on the information track immediately before recording are set on the same information track, and the spot is set on the same information track, and when the optical card is moved forward and backward. By providing a function to switch these roles at any time, stable and accurate information recording can be achieved without sacrificing recording speed.

Other embodiments of changing functions between a plurality of spots in the present invention will be shown using FIGS. 3 to 6.

The black spots in FIGS. 3 to 6 have the function of confirming immediately after recording. The hatched spots have a function of monitoring abnormalities in the information tracker 1517 before recording. Spots marked with white circles are spots used for recording, autofocus, and autotracking.

In each figure, from left to right on the information track 51b, 51
It is assumed that recording is performed from right to left on C.

In the embodiment shown in FIG. 3, between spots 63 and 64,
This is an example of switching only the function of the confirmation operation immediately after recording. This example focuses on high-speed and accurate recording while attempting to simplify the circuit configuration.

The embodiment shown in FIG. 4 is an example in which only the pre-recording monitor function is switched between spots 63 and 64. In the embodiment shown in FIG. 6, which is an example in which the main focus is on high-speed and stable recording while also attempting to simplify the circuit configuration, five spots 81 to 85 are located on the same information track 51, and the functions are This is an example of changing. Since the potential function of each spot is Ijj- (for example, whether spots 82 and 83 operate a monitor function, etc.), the circuit configuration of the preamplifier section etc. becomes simple. That is, spot 8
Since spots 4 and 85 only need to function as a confirmation operation, and spots 82 and 83 only need to have a monitoring function, there is no need for a switch circuit for this purpose, and the circuit configuration becomes simple.

In the embodiment shown in FIG. 6, the confirmation function and the monitor function are switched between spots 82 and 83, and during forward movement (information track 5]b), spot 84 performs auto-tracking and spot 85 performs auto-focusing. During return movement (on the information track 51c), spot 85 performs auto-tracking, and spot 84 performs auto-tracking.
This is used to perform autofocusing.

In the above embodiment, the confirmation function and the monitor function were mainly illustrated as the functions to be switched, but the function is not necessarily limited to these, and various functions such as a preheat function that preheats immediately before recording are used. Spots with various functions are also possible depending on the recording medium and method.

In the above embodiment, the (Q position) of the recording spot was not changed, but if a predetermined configuration such as arrangement adjustment and plurality of optical sensors is adopted, the embodiment shown in FIG. 9 and FIG. It is also possible to take the following configuration.

Figure 9 shows the configuration shown in Figure 3 with two beam spots 9.
0.91, and has a configuration in which the recording beam spot and the confirmation beam spot are interchanged depending on the scanning direction. It is easily understood that the method of this embodiment can be similarly applied to the dryer function shown in FIG.

FIG. 10 is a diagram showing a configuration that has both a monitor function and a confirmation function, and has five spots from spot 100 to +04. During forward movement (on information track 5Ib), spot 101 records information. During the return movement (information track 51c''-), spot +03 is used.

Furthermore, the present invention has advantages not only during recording but also during reproduction. For example, when reproducing is performed during each forward movement, high-speed reproduction can be achieved by switching the role of the flaw monitoring light before and after the reproducing light.

Incidentally, in the embodiment described above, a diffraction grating was used as a means for generating a plurality of light beams, but a plurality of lasers 8 may be installed. Alternatively, it may be a laser array packed into a single chip. Further, although specific methods of autofocus and autotracking have not been mentioned, for example, astigmatism autofocus and push-pull autotracking using the recording spot 62 are possible, and other methods are also applicable.

[Effects of the Invention] As explained above, according to the optical information recording/reproducing apparatus of the present invention, information recording/iQ generation is performed while the recording/reproducing head and the recording medium perform relative reciprocating motion. In an optical information recording/reproducing device of the type, a plurality of spots are placed on the same information track, and the function of at least one spot is switched during the forward and backward movements of the relative movement. The spots having roles corresponding to the recording/reproducing apparatus can be made to function in a predetermined order, and this has the effect of making it possible to record information stably and accurately at high speed.

4. Description of the Drawings FIG. 1 is a diagram showing the configuration of an optical card recording/reproducing apparatus which is an embodiment of the present invention.

FIG. 2 is a schematic diagram showing spots on a card for explaining the embodiment in detail.

3 to 6 are diagrams for explaining other embodiments of the present invention, respectively.

FIG. 7 and FIG. 8 are diagrams showing the configuration and spot arrangement of a conventional device, respectively.

FIG. 9 and FIG. 1O are diagrams for explaining other embodiments of the present invention, respectively.

1... optical card, 3...optical head, 66... optical sensor, 67.68.69...light receiving section, 70.71.72...Preamplifier, 73... switching circuit, 74...control circuit, 77...Interface.

78... Computer.

Agent Patent Attorney Minoru Yamashita Figure 2-51f Figure 3 Figure 4 1-111-1-11-1111112-51d Figure 5 ■

Claims (3)

[Claims] (1) In an optical information recording and reproducing device that records and/or reproduces information while relatively reciprocating a recording and/or reproducing head and an optical recording medium, the head records information on the recording medium. The plurality of spots formed are arranged so as to be located on the same track in the recording medium, and at least one of the plurality of spots is arranged so as to be located on the same track in the recording medium, and at least one of the plurality of spots is An optical information recording/reproducing device characterized in that the functions of two spots are changed. (2) The optical information recording/reproducing apparatus according to claim 1, wherein the optical recording medium is an optical card. (3) Among the plurality of spots, the spots to be changed are two spots, and these spots are arranged at positions sandwiching a recording and/or playback spot before and after the spot. The optical information recording/reproducing device according to scope 1.