JPH04209331A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To assure moving of a recording medium to a desired position in present ID range by detecting the position of the recording medium during movement when it is moved in the direction of the track and to compare it with a target position. CONSTITUTION:Reflected beam of optical card 2 is detected by a light pickup 3 under control of a system controller 5 controlling the optical recording reproducing device 1, and focal control and tracking control are carried out through a focus servo circuit 6 and a tracking circuit 7 by image pickup signal of the reflected beam. Furthermore, when the optical card 2 is moved in the direction of the track through a driving circuit 9, the position during movement is detected by the position control circuit 8 and by comparing with the target position, the optical card 2 is moved to the target position in the direction of the track through the driving circuit 9.

Description

[Detailed description of the invention]

[00011

[Industrial Application Field] The present invention detects the position of the optical information recording medium when it is moved in the track direction and compares it with the target position, thereby moving the optical information recording medium within the current ID area. The present invention relates to an optical information recording/reproducing device that can be reliably moved to a desired position. [0002] [0002] In recent years, optical cards have become popular as optical information recording media, for example, because they have the same size and shape as credit cards, are easy to carry, have a large storage capacity, and have a low cost per card. It is expected to be a next-generation information recording medium, and various proposals have been made. [0003] A conventional example will be explained with reference to the drawings. Figure 11
12 relates to a conventional example; FIG. 11 is an external view showing the external appearance of an optical card, and FIG. 12 is a configuration diagram showing a general configuration of a conventional optical information recording/reproducing apparatus. [00041 In the optical card 2 shown in FIG. 11, information is recorded as the level of reflectance and is optically reproduced. This optical card 2 has a plurality of linear strip-shaped tracks 3 parallel to each other.
2 is placed. Information is recorded and reproduced in units of 32 tracks. Areas called ID areas 35a, 35b, and 35c are arranged at both ends and the center of the track 32, and the ID areas 35a, 35b, and 35c contain each track number and a common area for each track for recognizing the track number. By recording a specific recognition pattern, the search for the target track 53 is facilitated. Furthermore, data areas 36a and 36b store previously recorded data and recorded data. The track direction refers to a direction parallel to the track 32, and the theta direction refers to a direction perpendicular to the track direction. Further, the direction from I[ area 35a to 35b is defined as the forward direction of the track direction, and the direction opposite thereto is defined as the reverse direction of the track direction. [0005] As a device for at least one of recording and reproducing information on such an optical card 2, there is a device disclosed in Japanese Utility Model Application No. 63-1.
As shown in Japanese Patent No. 45669, an optical information recording/reproducing apparatus as shown in FIG. 12 has been proposed. [0006] In order to record and reproduce information on the optical card 2, the optical card 2 placed on the frame 81 is moved in the track direction by a card motor 86 via a rubber roller 82 to correspond to the data area 36a or 36b. It is designed so that it can be moved back and forth. Further, in order to record and reproduce information on the optical card 2, an optical pickup 83 is disposed facing the optical card, and a head motor 8
5 in the theta direction via the screw 84. [0007] Generally, optical cards are warped or distorted, and the distance between the information recording surface and the optical pickup 83 is not constant.
To accurately record and reproduce information, autofocus control is required to accurately focus the light beam onto the optical card 2. Also, the optical card feeding direction and the track 32
Since the optical pickup 83 does not strictly match the extending direction of the track 32 and a deviation occurs, auto-tracking control is required to correct the deviation between the recording/reproducing position of the optical pickup 83 and the track 32. [0008] In this conventional example, in order to search for a target track, the card motor 86 is driven to set the recording/reproducing position of the optical pickup 83 to the ID area 3 of the optical card 2.
After moving it above 5a or 35c, focus control is performed. Thereafter, the track number is monitored while driving the head motor 85, and when the target track is detected, the head motor 85 is stopped and tracking control is started. [0009] Next, the card motor 86 is driven, and the optical pickup 83 records or reproduces information on the track 32 accordingly. When the recording/reproducing position of the optical pickup 83 reaches the ID area 35c or 35a on the opposite side, the recording or reproducing is stopped, the card motor 86 is also stopped, and the series of recording or reproducing is completed. [00101 In such an optical information recording/reproducing device, it is necessary to accurately move the light beam in the track direction. However, for example, if the recording/reproducing position of the optical pickup 83 is set to the ID area 35a or 35c of the optical card 2,
When moving the card by rotating the card motor 86 and then seeking to the target track while rotating the head motor 85, the recording surface of the optical card generally has defects, scratches, etc., so the track number or each track is Since a common recognition pattern is erroneously detected, there is a risk that a seek error may occur, such as seeking to the wrong track or making the seek operation impossible. [0011] Various compensation means have been proposed to compensate for such problems. For example, there is one in which the optical card 2 is slightly moved in the track direction, the card motor 86 is rotated for a predetermined period of time, the seek position is changed within the current ID area, and then seek is performed again. [0012]

However, in conventional optical information recording and reproducing devices, as a means of compensating for seek errors, the optical card is slightly moved in the track direction and the card motor is rotated for a predetermined period of time to determine the seek position. However, due to variations in the motor, etc., it is not only impossible to stop at a desired target position within the ID area, but also there is a risk of the movement outside the ID area. [00131 The present invention has been made in view of the above circumstances, and detects the moving position when moving the optical information recording medium in the track direction and compares it with the target position to determine the current ID@ area. An object of the present invention is to provide an optical information recording/reproducing device that can reliably move to a desired position. [0014]

[Means for Solving the Problems] The optical information recording and reproducing apparatus of the present invention optically records and reproduces information by irradiating a light beam onto an optical information recording medium in which a plurality of mutually parallel tracks are formed. An optical information recording/reproducing apparatus that performs at least one of the above includes: a position detection means for detecting a position in a track direction of a light beam irradiated onto the optical information recording medium; a comparing means for comparing a target position to be set and a position detected by the position detecting means; and a comparing means for comparing a set target position with a position detected by the position detecting means, and and control means for controlling the movement of the light beam to be stopped when the light beam is located at the target position. [0015]

[Operation] When moving the optical information recording medium in the track direction, the optical information recording medium is moved to the target position by detecting the moving position and comparing it with the target position. [0016]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. [00171 FIGS. 1 to 10 relate to an embodiment of the present invention, in which FIG. 1 is a block diagram showing the general structure of an optical information recording/reproducing device, FIG. 2 is a block diagram showing the structure of an optical pickup,
Figure 3 is a configuration diagram showing the configuration of the LED, Figure 4 is an explanatory diagram explaining the spherical aberration of the sapphire ball lens, Figure 5 is a format diagram showing the format of the track of the optical card, and Figure 6 is the structure of the photodetector. 7 is an explanatory diagram explaining the illuminance distribution of the photodetector, FIG. 8 is a configuration diagram showing the configuration of the position control circuit, FIG. 9 is a timing diagram explaining the operation of the position control circuit, and FIG. 10 is an optical card 3 is a flowchart illustrating the seek operation of FIG. [00181 As shown in FIG. 1, an optical recording/reproducing apparatus 1 that optically records and/or reproduces information includes:
A system controller 5 that controls this optical recording and reproducing device 1, an optical recording medium inserted and disposed in the optical recording and reproducing device 1, for example, the conventional optical card 2 shown in FIG. An optical pickup 3 that irradiates light onto the optical card 2 and receives reflected light; a demodulation circuit 4 that demodulates an imaging signal of the reflected light photoelectrically converted by the optical pickup 3; and a focus control circuit based on the imaging signal of the reflected light. A tracking servo circuit 7 performs tracking control based on the imaging signal of the reflected light, and a control signal from the system controller 5 and a clock signal from the demodulation circuit 4 position the optical card 2. a head motor 12 that moves the optical pickup 3 in the theta direction via a drive circuit 11 in response to a control signal from the system controller 5; It is comprised of a card motor 10 that moves the optical card 2 in the track direction via the card motor 10. [0019] The optical pickup 3, as shown in FIG.
Light from a light source, for example, an LED 14, is transmitted through a sapphire ball lens 22 having a spherical aberration and a refractive index of approximately 1.8, a collimator lens 15, a beam splitter 19, and an objective lens 1.
8, the recording surface of the optical card is irradiated with the reflected light, and the reflected light sequentially passes through the objective lens 18, the beam splitter 19, and the imaging lens 20, and is received by a photodetector 21. As shown in FIG. 3, the sapphire spherical lens 22 is adhesively fixed to the LED 14 in contact with the light emitting portion 14a of the LED 14 so that its optical axis center coincides with the light emitting portion 14a. For example, when the diameter of the light emitting part 14a is 35 μm and the diameter of the sapphire ball lens 22 is 500 lLm, the radiation angle θ of the light emitted from the sapphire ball lens 22 is about 11°, As shown in FIG. 4, a ring-shaped bright portion 22a with a diameter of approximately 400 μm is formed on the spherical surface due to spherical aberration. [00201 As an example of the track format of the optical card 2, as shown in FIG.
A guide pattern 33 formed by a black and white pattern extending in the track direction on the guideline 31 at the center of the track 32, and a data pattern formed by 8 bits each in the track width direction on both sides of this guide pattern 33, for a total of 16 bits. It consists of This data pattern is, for example, 3 mm in the track direction in the ID area 35a.
It is composed of a track-specific pattern formed by bands 38-1 to 38-8 extending over the area, and a track number pattern formed by bands 37-1 to 378 to recognize the number of each track. The area 36a is composed of 16-bit recorded data consisting of, for example, 5×5 μm dots. [00211 As shown in FIG. 5, the photodetector 21 is
For example, 16 data reading light-receiving areas 2l-AI to 2l-A16 are arranged corresponding to the 16-bit data pattern in the track width direction, and are spaced apart in the track direction so as to receive the image of the guide pattern 33. Five pairs of clock generation light receiving areas 2l-Bl to 2
l-BIO and four pairs of servo signal detection light-receiving areas 2l arranged to be spaced apart and facing each other in the track width direction so as to receive images of both edges of the guide pattern 33 in the track width direction.
-C1 to 2l-C4 and 2l-Di to 2l-B4. Incidentally, reference numeral 100 indicates the L formed on the photodetector 21 after being reflected by the optical card 2.
An image of the light emitting section 14a of the ED 14 is shown. [0022] Here, in FIGS. 2 and 3, the light emitting section 14 is imaged on the photodetector 21 with the recording surface of the optical card 2 at the focal position of the objective lens 18.
As shown by the solid line in FIG.
The arrangement position of the LED 14 adhesively fixed to the sapphire ball lens 22 and the magnification of the optical system are set so that the protruding surface 39 is formed near the outside of the sapphire ball lens 22. [0023] In this way, when the optical card 2 approaches the focus position of the objective lens 18, the illuminance distribution on the photodetector 21 becomes as shown by the broken line in FIG. When the card 2 moves further away than the focal position of the objective lens 18, it becomes as shown by a dashed line. That is, as the optical card 2 approaches the objective lens 18 side, the amount of light incident on the outer servo signal detection light receiving area 2l-C1 to 2l-C4 increases, and the amount of light entering the inner servo signal detection light receiving area 2l-DI increases. The amount of light incident on 21-04 decreases. Conversely, when the optical card 2 moves away from the objective lens 18, the amount of light incident on the outer servo signal detection light receiving areas 2l-C1 to 2l-C4 decreases, and the amount of light incident on the inner servo signal detection light receiving areas 2l-Dl decreases. Therefore, the amount of light incident on 2l-B4 increases. [0024]Further, the focus is determined based on the difference between the output sum of the outer servo signal detection light receiving areas 2L-CI to 2l-C4 and the output sum of the inner servo signal detection light receiving areas 2l-Di to 2l-B4. While obtaining the error signal (FE), the light receiving areas 21-, Dl and 2 for servo signal detection are
Output sum of l-B3 and light receiving area for servo signal detection 2l-B
A tracking error signal (TE) is obtained based on the difference between the output sum of 2 and 2l-B4. [0025] Also, one of the clock generation light receiving areas 2l-Bl and 2l-B3.2 forming a pair for clock generation.
1-B5.2l-B7.2l-A9, and the other clock generation light receiving areas 2l-Bl, 2l-B3.
A clock signal is obtained based on the difference in the output sum of 2l-B5.2l-B7.2l-A9, and in synchronization with this clock signal, the data reading light receiving areas 2l-AI to 2l are
-16 bits of data are read simultaneously from the output of A16. The clock signal is generated by receiving the image of the optical card 2 from the five pairs of clock generation light-receiving areas 2l-Bl of the photodetector 21 at 2l-BIO. It can also be used as relative position information. For example, if the size of one bit of the guide pattern 33 is 5×5 μm, then the size of one bit of the guide pattern 33 is 10 μm.
The same edge of the clock signal is generated at a period corresponding to , and position information with a resolution of 10 um can be obtained. [00261 As shown in FIG. 8, the main parts of this embodiment include the photodetector 21, the demodulation circuit 4, the first control circuit 8, the drive circuit 9, and the card motor 10. It is configured. [0027] The output from the photodetector 21 is input to the reproduction signal generation device 40 in the demodulation circuit 4, and the analog
A lead signal 41 and A clock signal 4 which is a synchronization signal
3 is generated, and the A read signal 41 and A clock signal 43 are converted into digital signals D read signal 51 and D clock signal 52 by the binarization circuit 42 and output to the system controller 5 shown in FIG. It has become. [0028] The counter 44 receives a preset signal 45 for setting a count value from the system controller 5.
and the D clock signal 52 indicating the position information of the optical card 2.
is now entered. A position setting signal 46 for comparing the output of the counter 44 and the count value from the system controller 5 is input to the comparator 45, and the output signal 48 of the comparator 45 is input to the selector 47. It is designed to be input to the select terminal (SEL). [0029] The A tarokk signal 43 is sent to the comparator 49
and 50, and are compared with reference voltages VTH and V as shown in the figure, and the output signals 55 and 56 are input to the IA terminal and 2A terminal of the selector 47, respectively. . Drive signals 53 and 54 for determining the drive direction of the optical card 2 are inputted from the system controller 5 to the IB terminal and 2b terminal of the selector 47. The input signal IA, 2A, or selected by the select terminal (SEL) of the selector 47
IB and 2B are outputted to output terminals IY and 2Y as motor control signals 57 and 58 for the card motor 10, so that the rotation of the card motor 10 can be controlled via the drive circuit 9. Table 1 shows the control logic of the drive circuit and the operation mode of the card motor 10. [00301

[Table 1] [00311] The relative positioning control operation of the optical card 2 of the optical information recording/reproducing apparatus 1 configured as described above will be explained with reference to FIGS. 8 to 10. [0032] FIG. 9 shows the timing of positioning control in FIG. 8, and FIG. 9(a) shows the timing of the A clock signal 43.
, (b) is the D clock signal 52, (c) is the comparator 4
5 output signal 48, (d) is the drive signal 53, (e)
is the drive signal 54, (f) is the output signal 55 of the comparator 49, (g) is the output signal 56 of the cossiparator 50,
(h) shows the motor control signal 57, (i) shows the motor control signal 58, and (j) shows the operation mode of the card motor 10, respectively. (00331 Assuming that the target position O point (Fig. 9 (a) 'J mark) is in the forward direction than the current position, the D
The number of clocks of the clock signal 52 is assumed to be N pulses. When attempting to position the optical card 2 at the target position, the card motor 10 falls into an oscillation state where it repeats reversal operations due to variations in drive control accuracy of the drive system and stop accuracy of the card motor 10, so the hysteresis width (VTR and VTL
), and the optical card 2 moves from point A including target position 0 to point B.
I am trying to stop between points. [0034] From the system controller 5, the target position 0
Comparator 45 with the number of pulses N corresponding to the point position setting signal 46
is set to In the initial state, the output signal 48 of the comparator 45 is at Lo- level because the set number N does not match the count value of the counter 44, and the selector 47 selects the drive signals 53 and 54. [0035] After initializing the count value of the counter 44 with the preset signal 45 from the system controller 5, the system controller 5 outputs the control signal 5 of the card motor 10.
7 to Hi-level, the control signal 58 of the card motor 10
is set to Lo-level, and the card motor 10 is rotated in the forward direction. When the card motor 10 is rotated in the forward direction, the D clock signal 52 is input to the counter 44 and the D clock signal 52 is counted. [00361 When the counter 44 counts N pulses (when the optical card 2 moves to the target position), the comparator 45 sets the output signal 48 to Hi-level, and the selector 47 sets the output signals 55 and 56 of the comparators 49 and 50 to to select, i.e., the control signal 5 of the driver circuit 9
7 becomes the output signal 55 of the comparator 49, and the control signal 58 becomes the output signal 56 of the comparator 50, so the card motor 10 enters a short brake state and stops the optical card 2 between points 0 and A. [0037] The dotted lines in FIGS. 9(a), (f), and (h) indicate the state where the optical card 2 overruns beyond point A after braking, and the card motor 10 is moved in the opposite direction. After being rotated, the optical card enters the short brake state again and stops between points A' and O'. [0038] In this way, it is possible to position the optical card near the rising edge of the D clock signal 52 that corresponds to the target position. [0039] Next, an example of a sequence for re-seek by relative positioning control of the optical card 2 of the optical information recording/reproducing apparatus 1 described above will be explained using the flowchart of FIG. [00401 In the seek operation, a target track is set in block 60, autofocus control is started, and the head motor 12 that drives the optical pickup 3 is activated. When the target track is detected, the process advances to block 61, the head motor 12 is stopped, auto-tracking control is started, and the seek operation is completed. [00411 If the target track is not detected within the predicted time and overtime occurs,
Track recognition is performed to determine whether the current position of the optical pickup 3 is on a track using a specific recognition pattern common to each track for recognizing the track numbers formed by 1 to 38-8, and the sheet number of the optical card 2 is determined. The track recognition pattern is detected up to the limit in the direction, and if detection is not possible, the head motor 12 is stopped and the seek operation is stopped as a seek error. [0042] If the track recognition pattern has been detected, the process proceeds to block 63, where the head motor 12 is stopped, and auto-tracking control is started as shown in step 63-1, and in step 63-2, the above-mentioned optical Target position setting for relative positioning control of the optical card 2 of the type information recording and reproducing apparatus 1 is performed as follows. [0043] There are two ways to set this target position: one is to perform the first seek after the optical card 2 is inserted, and the other is to perform the second and subsequent seeks. [0044] When a seek is performed first after the optical card is inserted, in FIG. 11, after the optical card 2 is inserted, the optical pickup 3 is positioned in the track direction by the card drive pattern 71a or 71b, and the optical pickup 3 is positioned in the track direction by the card drive pattern 71a or 71b. It is located approximately in the center. The optical pickup 3 performs a seek operation at this position. If you set a sufficient time to seek to the target track and cannot reach the target track within that time, a seek error will occur as a timeout, and the track that arrives immediately after this overtime will be used to locate the target position as follows. Settings are made. [0045] (1) Setting the moving distance. If the width of the ID area 35a is, for example, 3 mm, the ID area 35a is located approximately 1.5 mm from the optical pickup 3 data area 36a. If the size of defects, scratches, etc. on the optical card is 200 μm or less, the resolution of the position information (D clock signal) is 10 μm, so a value of 20 is set in the comparator 45 using the position setting signal 46. [0046] (2) The count value of the counter 44 is reset using the preset signal 45. (3) Set the moving direction and start the card motor 10. After moving, the recording and playback position of Hikari Big Up 3 (light beam)
The moving direction is the forward direction (direction from the end of the optical card 2 toward the center) so that it does not come off the optical card 2. Drive signal 5
3 is set to Hi-level, and the drive signal 54 is set to Lo-level. [0047] If you perform a seek from the second time onwards,
Recording and/or playback is performed on a certain track. At this time, the system controller 5 monitors the reproduction signal or the number of clocks while, for example,
Boundary detection of the region 35a is performed. When the ID area 35a is detected, the system controller 5
The target position within the ID area is set as follows. [00481(1) Setting the movement distance. A value of 150 is set in the comparator 45 using the position setting signal 46. Therefore, the moving distance is 1.
It will be 5mm. (2) Reset the count value in the counter 44 using the preset signal 45. (3) Set the moving direction and start the card motor 10. After moving, recording/playback position of optical pickup 3 (light beam)
The moving direction is the forward direction (direction from the end of the optical card 2 toward the center) so that it does not come off the optical card 2. Drive signal 5
3 is set to Hi-level, and the drive signal 54 is set to Lo-level. [0049] Subsequently, after canceling the auto-tracking control, the rotation direction of the head motor 12 is reversed in step 63-3. In this way, the target position is positioned and re-seek is performed. [00501 Note that if the target track cannot be detected by seeking again, the operation is performed up to seven times. [00511] The optical information recording and reproducing apparatus 1 of this embodiment can perform relative positioning control of the optical card 2 with a simple configuration, so that the seek operation of the optical card to the target track can be performed quickly and reliably. can be done. [0052] In this embodiment, position control is applied to re-seek, but it can also be applied to position control when the optical card 2 is reciprocated and reversed between ID areas. [0053] Effects of the Invention As explained above, the optical information recording and reproducing apparatus of the present invention optically records information by irradiating a light beam onto an optical information recording medium in which a plurality of mutually parallel tracks are formed. An optical information recording and reproducing apparatus that performs at least one of recording and reproducing includes a position detecting means for detecting a position in a track direction of a light beam irradiated onto the optical information recording medium; a moving means for moving the optical information recording medium in the track direction; a comparing means for comparing a set target position with a position detected by the position detecting means; and a control means for controlling the movement of the optical information recording medium to stop when the light beam is located at the target position based on the output. By comparing the optical information recording medium with the target position, it is possible to reliably move the optical information recording medium to a desired position within the current ID area.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a schematic configuration of an optical information recording/reproducing device.

FIG. 2 is a configuration diagram showing the configuration of an optical pickup.

[FIG. 3] A configuration diagram showing the configuration of an LED. FIG. 4 is an explanatory diagram illustrating spherical aberration of a sapphire spherical lens.

FIG. 5 is a format diagram showing the format of an optical card track.

FIG. 6 is a structural diagram showing the structure of a photodetector.

FIG. 7 is an explanatory diagram illustrating the illuminance distribution of a photodetector.

FIG. 8 is a configuration diagram showing the configuration of a position control circuit.

FIG. 9 is a timing diagram illustrating the operation of the position control circuit.

FIG. 10 is a flowchart illustrating the seek operation of the optical card.

FIG. 11 is an external view showing the external appearance of the optical card.

FIG. 12 is a configuration diagram showing a schematic configuration of a conventional optical information recording/reproducing device.

[Explanation of symbols]

2... Optical card 3... Optical pickup 5...System controller 8...Position control circuit 9...Drive circuit 10... Card motor 21... Photodetector

[Figure 1]

[Figure 7]

[Figure 11]

Claims (1)

[Claims] 1. An optical information recording and reproducing apparatus that optically records and/or reproduces information by irradiating a light beam onto an optical information recording medium in which a plurality of mutually parallel tracks are formed, comprising: A position detecting means for detecting the position of a light beam irradiated onto an optical information recording medium in the track direction, a moving means for moving the optical information recording medium in the track direction, a target position to be set, and the position detecting means. a comparison means for comparing the position detected by the optical information recording medium with the position detected by the moving means, and control for stopping the movement when the light beam is located at the target position based on the output of the comparison means while the optical information recording medium is being moved by the moving means. What is claimed is: 1. An optical information recording and reproducing device comprising: a control means for performing the following steps.