JPH0785325B2 - Optical information recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to recording or recording information by relatively reciprocating an information recording medium and an optical head unit (hereinafter, simply referred to as an optical head in the present specification) for irradiating the medium with a light beam. The present invention relates to an optical information recording / reproducing device for reproducing. Therefore, what is referred to as an information recording / reproducing apparatus in the present specification includes all apparatuses capable of only reproducing information, only recording information, or both recording and reproducing information.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for recording / reproducing information using a light beam, an optical disk for rotating a disk-shaped recording medium, an optical card for reciprocating a card-shaped recording medium, an optical tape, etc. There is. These devices are
Each has its own characteristics and is used depending on the purpose and application. Among them, optical cards are expanding their applications by taking advantage of the features such as ease of manufacturing, portability, and accessibility.

There are various possible modes for scanning the light beam applied to the optical card on the card. The irradiation position of the light beam is relatively linearly moved on the medium to reciprocate, and the irradiation position of the beam is also changed. The mode in which scanning is performed by relatively moving in a direction orthogonal to the reciprocating motion has features such as a simple mechanism and a large effective space on the medium. This conceptual diagram is shown in FIG. In the figure, 1 is an optical card on which information is to be recorded, 1'is a recording area surrounded by diagonal lines, 2 is a row of recorded information, 3 is an optical head part of a recording / reproducing apparatus, and 4 is optical from the optical head 3. A light beam condensed on the card, an arrow A is a direction in which the light beam 4, that is, an optical head reciprocates relative to the optical card 1, and an arrow B is a direction orthogonal to the reciprocating direction. Is.

FIG. 2 is a perspective view of a card mounting portion in a conventional device, and FIG. 3 is a sectional view taken along the line D-D of the card mounting portion shown in FIG. In FIGS. 2 and 3, 11 is an optical card on which information is to be recorded, a shaded portion 11 'is an area usable for recording, 12 is a row of recorded information (information track), and 13 is It represents the optical head of the device, 13 '
Is the optical head when moved to the leftmost side of the optical card,
13 ″ indicates the optical head when it is moved to the rightmost side.
Reference numerals 4, 14 ', 14 "denote light beams from the optical head. Reference numeral 15 is a mounting table on which the optical card is mounted, and 16 is a groove for inserting the optical card 11 provided on the mounting table 15. As shown in FIGS. 2 and 3, in the conventional mounting table, in order to correct the card warp, a part (11a, 11b) of the recording area 11 of the optical card is partly mounted on the mounting table 15 (15a,
15b) is used to hold it.

[0005]

However, in the above structure, the positioning of the card in the in-plane direction has not been sufficiently taken into consideration. If the card is not properly positioned in the in-plane direction, the direction along the information track and the relative reciprocal movement direction of the light beam will differ, and if the difference is large, the light beam will follow the information track. Tracking control cannot be performed,
As a result, there is a big problem that accurate recording or reproducing of information cannot be performed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an optical information recording / reproducing apparatus in which the in-plane positioning of a card is sufficiently performed and accurate information can be recorded or reproduced. For the purpose of provision.

The object is to provide a mounting table on which a card-shaped optical information recording medium having linear information tracks parallel to one side is mounted, an optical head, and the optical head and the mounting table. In the optical information recording / reproducing apparatus, which comprises a moving unit that relatively reciprocates in a direction along the information track, and performs at least one of recording and reproducing information on the information track by the optical head, in the mounting table. A first groove portion into which one end portion parallel to the information track of the recording medium is inserted, a second groove portion into which the other end portion is inserted, and one end portion of the recording medium on a side surface inside the first groove portion. Provided in the second groove portion for pressing
It is achieved by providing a leaf spring for pressing the other end.

[0008]

FIG. 4 is a perspective view showing an embodiment of an optical card mounting table used in an optical information recording / reproducing apparatus according to the present invention, and FIG. 5 is a sectional view taken along line EE of the apparatus shown in FIG. 6 is shown in FIG.
FIG. 6 is a sectional view taken along line FF of the apparatus shown in FIG. The numbers given to the respective members of the apparatus shown in FIGS. 4 to 6 and the same numbers as those given in FIGS. 2 and 3 are the members having the same function.
The description is omitted here.

4 to 6, a first groove 51 and a second groove 52 are formed on both sides of the card mounting table 15 along the direction of reciprocal movement.
Is provided so that one end of the card parallel to the information track 12 enters the first groove 51 and the other end enters the second groove 52. In addition, these grooves (5
The portion of the card that enters 1, 52) is the portion other than the recording area 1 '. The card mounting table 15 has recesses 53, 5 again.
3'is provided. Card pressing members 54, 54 'are housed in the recesses 53, 53' so that they can be moved up and down, and when a card is not inserted, the springs 55 allow the card pressing members (54, 54 ') to move to the card mounting table 15
Is pressed against parts 56 and 57 of the. When the card is inserted, the card retainers 54, 54 'are dented by the thickness of the card, the card is pressed from the back surface, and the card surface is pressed against the lower surface of the portions 56, 57 of the card mounting table 15. In this way, the optical card is held only by the card pressing member (54, 54 ') and the part (56, 57) of the card mounting table.

Reference numeral 58 designates a leaf spring arranged inside the second groove, and when the card 1 is inserted, the leaf spring comes into contact with one of the end portions parallel to the information track of the card so that the information track of the card is formed. The other end of the parallel ends is pressed against the reference surface (side wall inside the first groove) shown in FIG. 5 so that the position of the card in the in-plane (in-surface) direction does not move. Reference numeral 59 denotes a part of the card mounting table, which serves as a stopper for the card when the card is inserted. As is clear from FIG. 4, the relative linear movement amount of the optical head 13 and the optical card 11 is larger than that in FIG.
Therefore, the length of the track can be increased.

As shown in FIGS. 7A and 7B, the card generally has a warp in the longitudinal direction or the lateral direction, or a warp having both warps in these two directions.
When a card having such a warp is inserted into the card mounting table shown in FIGS. 4 to 6, the warp in the longitudinal direction of the card as shown in (b) is almost eliminated. Further, although the warp as shown in (a) remains to some extent, it becomes considerably small. Now optical head 13
Is scanned relative to the card 11 in the A direction, that is, in the direction of the information track, the relative moving speed in the A direction is very fast, and therefore, the objective lens of the optical head 13 is moved to its optical axis by the autofocusing control. You have to move fast in the direction. However, as described above, since there is almost no warp of the card in the A direction, the autofocusing sufficiently follows. However, B which is orthogonal to the A direction
Since the moving speed of the optical head in the direction relative to the optical card is slower than the moving speed in the A direction,
Even if there is some warpage of the card in the B direction, autofocusing sufficiently follows.

FIG. 8 is a diagram showing an embodiment of the optical information recording / reproducing apparatus according to the present invention having the above-mentioned optical card mounting table. In FIG. 8, 11 is an optical card, and 13 is an optical head unit of the apparatus. The optical head unit includes a light source 18 such as a semiconductor laser or an LED, a collimator lens 19 for collimating the light flux from the light source 18, a half mirror prism 20, an objective lens 21 for condensing parallel light flux on an optical card, and an optical card. It has a sensor 22 that receives the light flux reflected by the objective lens 21 and the prism 20 having a half mirror with the reflected light flux. In order to effectively use the high speed, the half mirror prism 20
May be replaced with a modified beam splitter, and a quarter wavelength plate may be inserted between the polarization beam splitter 20 and the objective lens 11.

Reference numeral 23 is a preamplifier, 24 is an auto-focusing servo, 25 is an auto-tracking servo, and 26 is an auto-tracking servo.
Is a decoder, 27 is an interface, 28 is a computer, 29 is an encoder, 30 is a leather driver, and 31 is stepping for moving the optical head 13 surrounded by a broken line in a direction perpendicular to the paper surface (direction B) (direction orthogonal to the track). It is a motor. 32 and 33 are pulleys,
34 is a belt wound around the pulleys (32, 33). The above-described mounting table 35 for mounting and fixing the optical card 1 is attached to the belt 34. The pulley 32 is attached to the shaft of the motor 36,
The rotation of the motor 36 causes the optical card 11 to reciprocate in the direction of arrow A in the figure. A motor servo 37 controls the rotation of the motor 36.

Next, the operation of the apparatus shown in FIG. 8 will be described. First, the reproduction operation will be described. The light beam oscillated by the laser 18 becomes a parallel light flux at the lens 19, then passes through the beam splitter 20, and then the objective lens 21
The light is condensed by the laser light to form a minute spot on the optical card 11. The reflected light from the optical card 11 is modulated depending on whether or not there is an information pit in the portion illuminated by the minute spot. The light beam reflected by the optical card becomes a parallel light beam by the objective lens 21, and the beam splitter 2
It is incident on the sensor 22 by 0. The sensor 22 detects a change in the light amount of the modulated light flux, converts it into an electric signal, and sends it to the preamplifier 23. A signal is sent from the preamplifier 23 to the autofocusing servo 24, and the signal from the autofocusing servo moves the lens 21 in the direction C, which is the optical axis direction, by the actuator (not shown), and the beam 14 focuses on the optical card 11. Similarly, the distance between the lens 21 and the optical card 11 is controlled.
The signal from the preamplifier 23 is also sent to the auto-tracking servo 25, and the signal from the auto-tracking servo 25 is output by an actuator (not shown).
The lens 21 is moved in the direction perpendicular to the paper surface, and the light beam is controlled so as to focus on a predetermined position.

Various methods are conventionally known for the auto-focusing servo and the auto-tracking servo, and the auto-focusing method and the auto-racking method can be applied to this apparatus. The description of the method is omitted.

Further, the signal from the preamplifier 23 is sent to the decoder 26, where it is electrically processed and then sent to the interface 27. Information signals are sent from the interface 27 to the computer 28. In addition, a signal is sent from the interface 27 to the encoder 29, and after being modulated as necessary, the oscillation of the laser 18 is controlled via the laser driver 30. Further, a signal is sent from the interface 27 to the pulse motor 31 to control the position of the optical head in the direction perpendicular to the paper surface. Further, a signal is sent from the interface 27 to the motor servo 37 to give a signal to the motor 36 to control the rotation of the motor 36.

Next, the case of recording will be described. In the case of recording, it is almost the same as in the case of reproducing, but in the case of recording, a stronger light is emitted from the laser 18 than in the case of reproducing. Similar to the case of reproduction, the light beam is imaged on the optical card 11, and information is recorded on the optical card according to the modulation of the laser beam. In this case, the conventional method can be applied to the auto focus and auto tracking methods.

[0018]

As described above, according to the present invention, since the card is positioned in the in-plane direction, when the card is mounted on the mounting table, the relative direction of the light beam and the direction along the information track is set. Reciprocal movement directions do not differ greatly, and accurate recording or reproduction of information becomes possible.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a driving method by reciprocating movement.

FIG. 2 is a diagram showing a card mounting table of a conventional optical information recording / reproducing apparatus.

FIG. 3 is a diagram showing a card mounting table of a conventional optical information recording / reproducing apparatus.

FIG. 4 is a diagram showing an embodiment of a card mounting table of the optical information recording / reproducing apparatus according to the present invention.

FIG. 5 is a diagram showing an embodiment of a card mounting table of the optical information recording / reproducing apparatus according to the present invention.

FIG. 6 is a diagram showing an embodiment of a card mounting table of the optical information recording / reproducing apparatus according to the present invention.

FIG. 7 is a diagram for explaining card warpage.

FIG. 8 is a diagram showing an embodiment of an optical information recording / reproducing apparatus according to the present invention.

[Explanation of reference numerals] 11 optical card 11 'recording area 12 information track 13 optical head portion 14 optical beam 15 mounting table 51, 52 groove 53, 53' recess 54, 54 'card pressing member 55 spring 58 leaf spring

Front page continuation (72) Inventor Masayuki Usui 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiroshi Matsuoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuhiko Matsuoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideki Hosoya 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Invention Person Akio Aoki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Masahiko Enari 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuo Minoura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A mounting table on which a card-shaped optical information recording medium having linear information tracks parallel to one side is mounted, an optical head, and the optical head and the mounting table are mounted on the information track. An optical information recording / reproducing apparatus, comprising: a moving unit that relatively reciprocates in a direction along which the optical head records and / or reproduces information on / from an information track. A first groove portion into which one end portion parallel to the information track is inserted, a second groove portion into which the other end portion is inserted, and one end portion of the recording medium to press the side surface inside the first groove portion. An optical information recording / reproducing apparatus, comprising: a leaf spring provided in the second groove portion to press the other end portion.