JPH0827967B2 - Optical information recording / reproducing device - Google Patents

Description

TECHNICAL FIELD 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 apparatus for recording / reproducing information while reciprocating an optical head and an optical card relatively.

[Prior Art] Various types of media such as an optical disk, an optical card, and an optical tape have been conventionally known as a form of a medium for recording and reproducing information using light. Each of these has its own characteristics,
Depending on the purpose and application, the optical card is expected to be used more and more in the future due to its features such as ease of manufacture, portability, and accessibility.

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

In the figure, 1 is an optical card for recording information, 3 is an optical head (a part surrounded by a dotted line in FIG. 7), 4 is a light beam, 5 is a shuttle for mounting the optical card 1, and 8 is a laser. The light source 9 is a collimator lens. Reference numeral 10 is a polarization beam splitter, and 30 is a quarter-wave plate, which allows the light traveling from the top to the bottom of the figure to be transmitted by the combination of the two members, but the light traveling from the bottom to the top is bent at a right angle. Reference numeral 11 denotes an objective lens which serves to collect parallel light on the optical card 1.

12 is an optical sensor, 13 is a preamplifier, 14 is an auto-focusing servo, 15 is an auto-tracking servo, 16 is a decoder, 17 is an interface, 18 is a computer, 19 is an encoder, 20 is a laser driver, 21 is a stepping motor, and an optical head 3 Has the function of moving in the direction perpendicular to the paper surface.

22 and 23 are pulleys, and a belt 24 is attached to the pulleys 22 and 23. A shuttle 5 for mounting and fixing the optical card 1 is attached to the belt 24. pulley
22 is attached to the shaft of a motor 26, and the rotation of the motor 26 causes the optical card 1 to reciprocate in the direction of arrow A in the figure.

Next, the operation of the apparatus shown in FIG. 7 will be described by taking the case of information reproduction as an example.

In FIG. 7, the light beam oscillated from the laser 8 is collimated by the collimator lens 9, passes through the polarization beam splitter 10 and the quarter-wave plate 30, and is further condensed by the objective lens 11. A minute spot is formed on the card 1. The reflected light from the optical card 1 is modulated depending on whether or not there is an information pit in the portion illuminated by the minute spot, and this modulated light is again collimated by the objective lens 11 and is incident on the optical sensor 12 by the polarization beam splitter 10. To be done. The optical sensor 12 detects a change in the amount of modulated light, converts it into an electric signal, and sends it to the preamplifier 13. A signal is sent from the preamplifier 13 to the autofocusing servo 14, and the objective lens 11 is moved in the B direction by an actuator (not shown) by the signal from the autofocusing servo 14, and the light beam 4 focuses on the optical card 1. Thus, the distance between the objective lens 11 and the optical card 1 is controlled.

The signal from the preamplifier 13 is also sent to the auto tracking servo 15,
The signal from 15 controls the objective lens 11 to move in a direction perpendicular to the paper surface by an actuator (not shown) so that the light beam 4 is focused at a predetermined position. During the initial operation of the device, a servo pull-in command is sent from the interface 17 to the auto focusing servo 14 and the auto tracking servo 15. Autofocusing servo 14
Several specific methods have been proposed for the auto tracking servo 15 and the auto tracking servo 15. For example, the light beam 4 is divided into a plurality of pieces by a grating or the like, and the optical card 1 is pre-tracked for auto focusing or auto tracking. Is pre-formatted, information is reproduced by at least one of a plurality of light beams, and signals for autofocus and autotracking are extracted by other beams. Further, the signal from the preamplifier 13 is sent to the decoder 16 and subjected to an electrically necessary process, and then sent to the interface 17. Information signals are sent from the interface 17 to the computer 18.
In addition, a signal is sent from the interface 17 to the encoder 19 and, after being subjected to modulation as necessary, controls the oscillation of the laser 8 via the laser driver 20.

Further, signals are sent from the interface 17 to the stepping motor 21 and the motor servo 27, and the position control and the motor 26 of the optical head 3 in the vertical direction with respect to the paper surface are performed.
Rotation control is performed.

In the optical card recording / reproducing apparatus that performs the above-mentioned operation, it is required that the optical card be reliable enough to record information stably and accurately. Stable recording means that, for example, when there are scratches, dust, or other defects on the surface or recording surface of the optical card, the presence of such defects causes information to be written to tracks other than the information tracks on which information should be originally recorded. This means that there is little possibility of recording by mistake. In order to meet such demands, a device as shown in FIG. 8 has been proposed in a conventional device in which a medium such as an optical disk rotates in one direction with respect to an optical head. 8th
In the figure, reference numeral 41 is an information track, and a first spot 42 for recording / reproducing information on the same information track, and a role of performing pre-detection as soon as there is a foreign substance 44 on the information track on which information is to be written. The third spot 45, which plays a role of reproducing, is located immediately after recording to determine whether or not the information recorded as the second spot 43 having the mark and the pit 46 is accurate. Therefore, it is possible to prevent the first spot 43 from being transferred to another information track by knowing the existence and size of the defect before recording by the second spot 43, for example, by locking the auto focusing servo and the auto tracking servo. It is possible. In addition, if the information pit 46 recorded by the third spot 45 is reproduced and it is determined whether or not the information is correctly recorded, a new information track is immediately output if erroneous writing is made.
It is possible to correct and record to 41.

[Problems to be Solved by the Invention] However, when the apparatus having the configuration shown in FIG. 8 is applied to an optical card recording / reproducing apparatus in which an optical head and an optical card reciprocate relatively, Has the drawback of being significantly slower. That is, as shown in FIG.
When the roles of the second spot and the third spot are fixed, recording must be performed in the forward movement (or in the backward movement). Therefore, for example, in order to record over two information tracks, the optical head and the optical card must make two reciprocations. In this case, when a large amount of information is recorded, an inconvenience occurs in that the recording time is long.

[Means for Solving Problems] The present invention has been made in view of the above problems. That is, an object of the present invention is to provide an optical card recording / reproducing apparatus capable of recording information stably and accurately without reducing the recording speed.

An object of the above is to provide an optical information recording / reproducing apparatus for recording and / or reproducing information while reciprocally moving a recording and / or reproducing head and an optical recording medium. A plurality of spots formed on the optical recording medium are arranged so as to be located on the same track in the optical recording medium, and the plurality of spots are provided in correspondence with the forward and backward movements of the reciprocating motion. Among the spots, the order of the recording spot for recording information corresponding to the modulated recording signal and the confirmation spot for confirming the recorded information is changed, and the plurality of spots are formed through the diffraction grating in the head. Is formed on the optical recording medium, and the reproduction information read by the confirmation spot is corrected by referring to the modulated recording signal. It is achieved by a dynamic information recording / reproducing apparatus.

[Operation] The feature of the present invention is to change the function of at least one of the plurality of spots in correspondence with the scanning direction during forward movement and backward movement, thereby forming a spot having a predetermined function. It is to make them function in a predetermined order.

For example, according to the above-mentioned example, by switching the functions of the second spot and the third spot, the preliminary survey before recording, the recording of information, and the recording after recording can be performed in both forward and backward movements. Enables confirmation operation. Therefore, when recording on two information tracks, 1
The reciprocating operation is possible, and the recording speed is doubled as compared with the conventional example.

[Examples] Hereinafter, the optical information recording / reproducing apparatus of the present invention will be described in detail based on specific examples.

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

The components having substantially the same functions as those of the device shown in FIG. 7 are designated by the same reference numerals, and the description thereof 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 light receiving portions on the optical sensor. Reference numerals 70, 71 and 72 are preamplifiers, 73 is a switching circuit for switching the function of the light spot, 74 is a control circuit, 77 is an interface, and 78 is a computer.

In the optical head 3, the parallel light flux formed by the collimator lens 9 is made into three beams by the diffraction grating 61. The three beams are imaged as three spots 62, 63 and 64 on the optical card 1 by the objective lens 11. The direction in which the three spots are arranged is a direction parallel to the direction A in which the optical card 1 reciprocates. The reflected beam from the optical card 1 passes through the quarter-wave plate 30 and the polarization beam splitter 10, and is then focused by the sensor lens 65 onto the optical sensor 66. Light sensor
The 66 has three light receiving parts 67, 68, 69 corresponding to the three beams, and converts a change in the light amount of each beam into a change in the electrical characteristics.
The output from each light receiving part corresponds to the one-to-one preamplifier 70,7
After being sent to 1, 72 and subjected to a predetermined process, it is passed to the switching circuit 73.

Next, the operation after the switching circuit 73 will be described using FIG. 2 together with FIG. FIG. 2 is a diagram showing the arrangement of light spots on the information track on the optical card. The information tracks 51a, 51b, ..., 51f in FIG.
It is provided parallel to the reciprocating direction A of the optical card. As described with reference to FIG. 1, the three spots 62, 63 and 64 are located on the same information track 51. Information track 51 now
Consider the case where information is recorded as pits 55 on b. The three spots 62, 63, 64 formed by the diffraction grating 61 have different intensities, at least the intensity of 62 is greater than that of 63, 64. The recording command and the recording contents from the computer 78 are transmitted to the laser driver 20 via the interface 77 and the encoder 19 to drive the laser 8 as a predetermined modulated recording signal. Information is recorded by the spot 62 on the information track 51b corresponding to this modulated recording signal. The spot 64 reads the written information immediately after recording. Outputs from the light receiving unit 69 corresponding to the spot 64 and the preamplifier 72 are transmitted from the switching circuit 73 to the decoder 16 and reproduced immediately after recording, and this reproduced information is sent to the interface 77. At the interface 77, the reproduction information is compared with the information to be originally recorded. When it is determined that the recording is not normally performed, for example, a command is issued to record again on the adjacent information track 51c.

Further speaking, since the confirmation spot 64 itself is also modulated by the recording information, the recording modulation information is sent from the interface 77 to the preamplifiers 70, 71, 72 by a command (not shown), and inside the preamplifier 72, Accurate information can be obtained by referring to and correcting the information. That is, inside the preamplifier 72, for example,
With reference to the recording modulation information, the gain is corrected so that the signal level of the reproduction signal of the optical sensor 69 from the confirmation spot 64 is constant.

Next, the case of recording on the information track 51c in FIG. 2 will be described. Information was recorded from left to right in FIG. 2 when recording on the previous information track 51b (provisionally called forward), but recording on the next information track 51c is for speeding up the recording speed. , Recording is performed from right to left in the figure (that is, recording is performed at the time of backward movement). If the relative reciprocal relationship between the optical head 3 and the optical card 1 during normal reproduction (for example, a device that reads information from left to right during reproduction in FIG. 2), for example, 1 during recording. It is also possible to reverse the order of the information of the tracks and record. When recording on the information track 51c, the spot 63 is used for confirmation immediately after recording. That is, the interface 77 judges whether the feeding direction of the optical card 1 is the forward direction or the backward direction, and transmits the information to the switching circuit 73. Based on this information, in the switching circuit 73, the signal from the preamplifier 72 at the time of the forward movement, and the preamplifier 71 at the time of the backward movement.
Decoder for the purpose of immediate confirmation after recording the signal from the above
Tell 16.

Furthermore, when recording on the information track 51c, a spot 64
Explain the role of. The spot 64 monitors the state of the information track 51c immediately before recording by the spot 62. If there is any foreign matter / defect 56, its presence appears as a variation in the amount of light reaching the light receiving unit 69. Light receiving section
The signal from 69 is transmitted to the control circuit 74 via the preamplifier 72 and the switching circuit 73. In the control circuit 74, if the output from this switching circuit is judged to be defective by considering its size, continuous time, etc., each servo state is held in the auto focusing servo 14 and auto tracking servo 15. Give instructions. The holding time width may be, for example, until it is confirmed that the signal from the preamplifier 72 has passed over the foreign matter 56 and returned to a predetermined level, or until a predetermined time has elapsed. As a result, the spots 62, 63, 64 can be again quickly located on the information track 51c. The control circuit 74 informs the interface 77 that the foreign matter having a great influence exists on the information track 51c and that the above control is performed. The interface 77 responds to this signal to record the information on the information track 51d again, or the defect is detected on the information track 51d.
Assuming that the width is larger than the width of, the instruction is issued to each place to record on the information tracks separated by a plurality of lines. As described above, when recording on the information track 51c (during backward movement), the spot 64 monitors the track, but when recording on the information track 51b (during forward movement), the spot 63 plays this role. Is. Therefore, the switching circuit 73, based on the forward / backward information from the interface 77,
Control circuit 7 by selecting and switching information from preamplifiers 71 and 72
Tell 4.

As is clear from the above description with reference to FIGS. 1 and 2, the reciprocating optical card 1 plays a role of performing reproduction immediately after recording and confirming recorded information, and an information track immediately before recording. Spot the role of detecting the above abnormality,
Stable and accurate information recording is sacrificed at the recording speed by setting it on the same information track and having a function to switch these roles during forward and backward movement of the optical card. Can be achieved without.

Another embodiment of the function change between a plurality of spots in the present invention will be described with reference to FIGS.

The black-filled spots in FIGS. 3 to 6 have a function of performing confirmation immediately after recording. The shaded spots have a function of monitoring an abnormality on the information track 51 before recording. Further, spots indicated by white circles are spots used for recording, auto focus, and auto tracking.
In each figure, recording is performed from left to right on the information track 51b and from right to left on 51c.

The embodiment shown in FIG. 3 is an example in which only the confirmation operation function is switched between the spots 63 and 64 immediately after recording. This is an example that focuses on particularly high-speed and accurate recording while attempting to simplify the circuit configuration.

In the embodiment shown in FIG. 4, between the spots 63 and 64,
In this example, only the monitor function before recording is switched. Similarly, this is an example of focusing on high-speed and stable recording while attempting to simplify the circuit configuration.

The embodiment shown in FIG. 5 is an example in which five spots 81 to 85 are positioned on the same information track 51 to change the function. Since each spot has a single potential function (for example, whether or not the spots 82 and 83 operate the monitor function), the circuit configuration of the preamplifier and the like becomes simple. That is, since the spots 84 and 85 need only have a confirmation operation function, and the spots 82 and 83 need only have a monitor function, a switching circuit for that purpose is unnecessary and the circuit configuration is simple.

In the embodiment shown in FIG. 6, the confirmation function and the monitor function are switched between the spots 82 and 83, and during the forward movement (on the information track 51b), the spot 84 performs auto-tracking and the spot 85 performs auto-focusing. During the backward movement (on the information track 51c), the spot 85 performs auto-tracking and the spot 84 performs auto-focusing.

In the above embodiments, the confirmation function and the monitor function are mainly illustrated as the switching function, but the switching function is not necessarily limited to this, and various kinds of preheating functions such as preheating immediately before recording are provided. It is possible to use spots having various functions according to the recording medium and method.

Further, although the position of the recording spot is not changed in the above-mentioned embodiment, if the predetermined configuration such as the arrangement adjustment of the optical sensor and the pluralization is adopted, the configuration of the embodiment shown in FIGS. Can also be taken.

FIG. 9 shows the configuration shown in FIG. 3 with two beam spots.
This can be done by 90 and 91, and 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 monitor function shown in FIG.

FIG. 10 is a diagram showing a configuration having both a monitor function and a confirmation function. It has five spots 100 to 104, and it is spot 1 when moving forward (on the information track 51b).
Information is recorded by 01, and at the time of return (information track 51
In c), the spot 103 is used.

Further, the present invention has an advantage not only in recording but also in reproducing. For example, in the case of performing reproduction in each of the forward movement and the backward movement, by switching the roles of the scratch monitor light before and after the reproduction light, high speed reproduction can be achieved.

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

As described above, according to the optical information recording / reproducing apparatus of the present invention, the information recording / reproducing is performed while the recording / reproducing head and the recording medium relatively reciprocate. In this optical information recording / reproducing apparatus, a plurality of spots are positioned on the same information track, and the function of at least one spot is switched at the time of the forward movement and the backward movement of the relative movement, thereby the recording / reproducing apparatus. It is possible to cause the spots of the roles corresponding to the above to function in a predetermined order, and it is possible to perform stable and accurate information recording at high speed. In addition, since the optical head according to the present invention includes one light source and a diffraction grating that obtains a plurality of spot lights from the light sources, the optical configuration is simplified, and the effect that optically complicated adjustment is unnecessary is also achieved. Can play. Further, by setting the output signal of the reproduction information from the reproduction spot to a constant level, the information can be confirmed accurately and the reliability of the confirmation function can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of an optical card recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view showing spots on a card for explaining the above embodiment in detail. 3 to 6 are views for explaining other embodiments of the present invention. FIG. 7 and FIG. 8 are diagrams showing the structure and spot arrangement of a conventional device, respectively. 9 and 10 are views for explaining another embodiment of the present invention. 1 ... Optical card, 3 ... Optical head, 66 ... Optical sensor, 6
7,68,69 …… Light receiving part, 70,71,72 …… Preamplifier, 73 ……
Switching circuit, 74 ... Control circuit, 77 ... Interface,
78 …… Computer.

Claims (2)

[Claims] 1. An optical information recording / reproducing apparatus for recording and / or reproducing information while reciprocally moving a recording and / or reproducing head and an optical recording medium, the optical head comprising: The plurality of spots formed on the recording medium are arranged so as to be located on the same track in the optical recording medium, and the plurality of spots are provided at the time of the forward and backward movements of the reciprocating motion. Among these, the order of the recording spot for recording the information corresponding to the modulated recording signal and the confirmation spot for confirming the recorded information is changed, and the plurality of spots are formed through the diffraction grating in the head. Is formed on the optical recording medium, and the reproduction information read by the confirmation spot is corrected with reference to the modulation recording signal. Recording / playback device. 2. The optical information recording / reproducing apparatus according to claim 1, wherein the optical recording medium is an optical card.