JPH079705B2 - Data recording / reproducing device for optical card - Google Patents

Description

The present invention relates to a data recording / reproducing apparatus, and more particularly to an apparatus for optically recording / reproducing data on / from an optical card.

[Prior Art] In recent years, optical cards have come into the limelight as information recording media. Pocket-sized cards are widely used such as cash cards and credit cards, and this optical card is also expected to spread rapidly. An optical card normally records / reproduces data by a light beam such as a laser, and thus requires a data recording / reproducing device dedicated to the optical card. A recording / reproducing apparatus generally used in the past has a head unit for emitting a light beam and receiving a reflected beam from an optical card,
It consists of a drive for moving the optical card. Since data is recorded on a two-dimensional plane in the vertical and horizontal directions on the optical card, the drive unit moves the optical card in the horizontal direction, for example, to drive the objective lens in the head unit in the vertical direction. I had a mechanism.

[Problems to be Solved by the Invention] Since the conventional recording / reproducing apparatus records / reproduces data while moving the optical card as described above, a space corresponding to the maximum movement distance of the optical card is provided in the apparatus. However, there is a problem in that the size of the entire device must be increased.

Therefore, an object of the present invention is to provide a data recording / reproducing apparatus for an optical card, which can reduce the size of the entire apparatus.

[Means for Solving Problems] A feature of the present invention is that in a data recording / reproducing apparatus for recording and / or reproducing data to / from an optical card, supporting means for supporting and fixing the optical card during recording / reproducing of data,
A head unit for irradiating the optical card with a light beam for recording and reproduction, a first sliding unit for sliding the head unit in the vertical or horizontal direction of the optical card, and a sliding unit for sliding the first sliding unit. Second sliding means for sliding in a direction perpendicular to the moving direction is provided, and both the sliding means move the head portion to a desired position on the optical card to record / reproduce data. is there.

[Operation] With the configuration described above, it is not necessary to move the optical card during data recording / reproduction, so it is not necessary to take up a large space compared to the size of the optical card, and the device can be downsized. Can be achieved.

[Examples] The present invention will be described below in detail based on illustrated examples. First
FIG. 1 is a top view of a head section of a data recording / reproducing apparatus according to the present invention and a drive mechanism thereof. The head part 100 is attached to a first sliding means 200 which is an electromagnetic driving means in the Y direction, and the first sliding means 200 is a second sliding means which is an electromagnetic driving means in the X direction perpendicular to the Y direction. It is attached to the sliding means 300. The head part 100 slides on the first sliding means 200 in the Y direction in the figure, and the first sliding means 200 slides on the second sliding means 300 in the X direction in the figure.

The mounting state of the head portion 100 on the first sliding means 200 is shown in detail in FIG. The lens frame 101 of the head unit 100 incorporates an objective lens 102, a laser diode 103, and other optical systems (not shown) necessary for recording and reproducing data. The lens frame 101 is fixed to a support plate 105 made of a rigid body by a support plate spring 104. On the other hand, the first sliding means 200 has a U-shaped yoke 201, a permanent magnet 202 provided inside the yoke 201, and another yoke 203.
V-shaped grooves are provided above and below the yoke 203,
The slider 204 slides along this groove. A bobbin 205 (not shown in FIGS. 1 and 2) is attached to the end surface of the slider 204, and a coil 206 is wound on the bobbin 205.

FIG. 3 is a sectional view of the first sliding means 200 taken along a portion MM ′ of the slider 204. A jig 207 having a screw function is attached to the upper portion of the slider 204, and a leaf spring 208 is attached to the lower portion, and a ball 209 is sandwiched between the jig 207 and the leaf spring 208 and the yoke 203. . Slider 2
04 can slide by the rolling friction between the two balls 209 and the yoke 203. 4 shows the slider 204
3 is a detailed view of the lower part of FIG. The leaf spring 208 is fixed to the slider 204 by screws 210. Further, the pressing strength of the leaf spring 208 against the ball 209 is adjusted by the screw 211 provided on the other side of the leaf spring 208. Oiles metal may be used instead of the ball 209.

FIG. 5a is a sectional view of the first sliding means 200 taken along the portion NN ′ of the coil 206. The yoke 201, the ball 209 and the like are omitted in this figure. As can be seen in this figure, the bobbin 205 has a U-shape and a coil 206 is wound around it. The bobbin 205 is not provided on the permanent magnet 202 side.
The coil 206 may be arranged inside the bobbin 205 as shown in FIG. 5b. It is also possible to integrally form the bobbin 205 and the coil 206.

Referring again to FIG. A coil 107 is attached to the lens frame 101 via a support plate 106 made of a rigid body. This coil 107 has a flat shape as shown in FIG.
A part 107a of the coil 107 is arranged in a magnetic gap formed by the yoke 203 and the permanent magnet 202, and both parts 107a and 107b of the coil are installed with respect to the yoke 203 and the permanent magnet 202 with a gap. ing. When the slider 204 slides on the yoke 203, that is, in the Y direction, since the support plate 105 is fixed to the slider 204, the head unit 100 slides in the Y direction as a whole, and the coil 107 also moves along the yoke 203. It will slide in the Y direction.

Next, the structure of the second sliding means 300 will be described with reference to FIG. 1 again. The second sliding means 300 has the same basic structure as the above-mentioned first sliding means. That is, a yoke 301, a permanent magnet 302, a yoke 303 having upper and lower V-shaped grooves, a slider 304, a bobbin 305 (not shown) attached to the slider, and a coil 30 wound on the bobbin 305.
6, a jig 307 for slidably mounting the slider 304 on the yoke 303, a leaf spring 308 (not shown), a ball 309
It consists of a screw 310 (not shown) (not shown), and a positioning member 311 (not shown). Similar to the first sliding means 200, the slider 304 slides on the yoke 303 in the X direction. Since this sliding mechanism is exactly the same as the first sliding means 200, detailed description is omitted. The important point here is that the slider 304
That is, the yoke 201 of the sliding means 200 is fixed.
Therefore, when the slider 304 slides, the entire first sliding means 200 slides accordingly.

Next, the operation of this device will be described. The optical card 400 to be recorded / reproduced is supported and fixed at the position shown by the one-dot chain line in FIG. FIG. 7 shows the O of this device near the lens frame 101.
It is an O'sectional view. The head unit 100 is a laser diode 10
The light emitted from 3 is reflected by the prism 108, condensed by the objective lens 102 and irradiated onto the optical card 400, and the reflected light from here again passes through the objective lens 102 and further through the prism 108 to form a photodetector. Configured to be detected at 109. The detailed operation of the optical system of the head unit 100 will be described later with reference to FIGS. 10 and 11.

In order to perform such a light beam irradiation on the entire recording area of the optical card 400, the objective lens 102 may be moved within an arbitrary area shown by the one-dot chain line in FIG. If an appropriate current is applied to the coil 206, the slider 204 can be slid in the Y direction in FIG. 1 by the magnetic action between the coil 206 and the permanent magnet 202. Also, the coil 306
If an appropriate current is applied to the coil 306 and the permanent magnet 3
Due to the magnetic action with 02, the slider 204 and the entire first sliding means can be slid in the X direction in FIG. Therefore, by appropriately controlling the currents applied to the coil 206 and the coil 306, the objective lens 102 can be moved to any position on the optical card 400, and information reading / recording scanning of the optical card 400 can be performed.

In the conventional apparatus for recording / reproducing while moving the optical card 400 itself, as shown in FIG. 8, it is necessary to secure a space for the entire moving width l of the optical card 400 in the apparatus. On the other hand, in the present device, the optical card 400 does not need to be moved and can be in a fixed state.
It is sufficient to ensure a space of length l ', which is the total width of itself plus the width of the card support member. Another feature of this apparatus is that the bobbin 205 has a U-shape as shown in FIG. 5, and the bobbin 205 is eliminated between the permanent magnet 202 and the yoke 203. By eliminating the bobbin in this way, the magnetic coupling between the yoke 203 and the permanent magnet 202 is further strengthened, and it is possible to achieve low current drive or miniaturize the magnetic device.

Another feature of the device is the focus adjustment function. 10th
The figure is an explanatory view showing only the optical system in the lens frame 101 shown in FIG. Here, the optical path of the light beam is shown by a one-dot chain line. As described above, the light beam from the laser diode 103 is reflected by the half mirror on the surface 108a of the prism 108, is condensed by the objective lens 102, and is drawn by the optical card 400 (the size of the card is reduced in the drawing). ), The reflected light passes through the objective lens 102 again, and further through the surface 108a of the prism 108, and the prism 108
A part of the light flux goes straight on the bottom surface 108b of the light source and is detected by the photodetector 109 to read information. The photodetector 109 is provided with a signal detection photodetector 109a and focus adjustment photodetectors 109b and 109c. The photodetector 109a includes the prism 10 described above.
The light beam traveling straight on the bottom surface 108b of 8 enters. However, the other part of the above-described light flux is incident on the photodetectors 109b and 109c as a light beam reflected by the bottom surface 108b of the prism 108 and reflected again by the reflection film 108d provided on the surface 108a.

Next, the principle of focus detection will be described with reference to FIG. FIG. 11A is a diagram in which the head portion is at the in-focus position with respect to the laser card 400, FIG. 11B is a diagram in which the laser card 400 is defocused downward due to surface wobbling, etc., and FIG. FIG.

In FIG. 11A, the light flux emitted from the laser diode 103 is reflected by the surface 108a (half mirror) of the prism 108, and then the objective lens 102 causes the laser card 4 to move.
Focused on 00. The reflected light from the laser card 400 passes through the surface 108a of the prism 108 that follows the same optical path as before, a part of the light flux is reflected by the bottom surface 108b, and then is focused at a point 108c on the surface 108a. A total reflection portion 108d is formed on the prism surface 108a in contact with this point 108c. The light flux focused at the point 108c then irradiates both detectors of the photodetectors 109b and 109c with an equal amount of light. Here, the output values of the photodetectors 109b and 109c are guided to a differential amplifier (not shown), and a zero value which is the difference between the outputs of the two detectors is detected. On the other hand, when defocus occurs as shown in FIGS.
Output difference appears in b and 109c. By detecting this output difference, it is possible to obtain the vertical displacement direction and the displacement amount of the laser card 400.

Now, as shown in FIG. 2, the lens frame 101 is attached to the support plate 105 via a leaf spring 104. Therefore, the lens frame 101 can be moved to some extent in the vertical direction of the drawing, that is, the Z direction. Now, if a current is applied to the coil 107, the lens frame 101 can be moved up and down in the Z direction by the interaction between the coil 107 and the permanent magnet 202.
This situation will become clearer with reference to FIG. Focusing can be performed by moving the lens frame 101 up and down in this way. In the conventional device, a coil and a permanent magnet are required in the lens frame 101 to perform such focus adjustment, but in the present device, the first sliding means is used.
The permanent magnet 202 provided for 200 can also be used as a magnet for driving the lens frame.

Finally, the effects peculiar to the above-described embodiment can be summarized as follows.

(1) Since the objective lens side is moved while the optical card is fixedly supported, a space for moving the optical card is unnecessary, and the device can be downsized.

(2) Since the magnet for moving the objective lens can also be used as the magnet of the first sliding means, the weight of the head portion can be reduced.

(3) In the sliding means, since the bobbin is not provided between the yoke and the permanent magnet, the magnetic coupling force becomes strong, and low current driving or downsizing of the magnetic device can be achieved.

(4) Since the yoke itself is used as the rail in the sliding means, the size can be reduced.

[Effects of the Invention] As described above, according to the present invention, in the optical card data recording / reproducing apparatus, since the two sliding means for driving the head portion in two dimensions are provided, it is possible to move the optical card. No space is required, and the size of the entire device can be reduced.

[Brief description of drawings]

FIG. 1 is a top view of a head portion of a recording / reproducing apparatus and a driving mechanism thereof according to the present invention, FIG. 2 is a detailed view showing a mounted state of the head portion of the apparatus shown in FIG. 1, FIG. 3 and FIG. First
FIG. 5 is a detailed sectional view showing a sliding mechanism of the device shown in the drawing, and a detailed perspective view, FIG. 5 is a sectional view showing a magnetic device portion of the device shown in FIG. 1, and FIG. 6 is used for the device shown in FIG. FIG. 7 is a perspective view of a coil, FIG. 7 is a cross-sectional view for explaining the operation of the device shown in FIG. 1, FIG. 8 is a view showing a space for an optical card in a conventional device, and FIG. 9 is an optical card in the device according to the present invention. Space for use, FIG. 10 is a view showing the optical system of the apparatus shown in FIG. 1, FIG. 11 is a view showing the focus adjustment principle in the apparatus shown in FIG. 1, and FIG. FIG. 11b and FIG. 11c are views in which the head portion is out of focus. 100 head unit 101 lens frame 102 objective lens 103 laser diode 104 leaf spring 105 support plate 106 support plate 107 coil 108 prism 108 photo detector 200 ...... First sliding means 201 ...... Yoke 202 ...... Permanent magnet 203 ...... Yoke 204 ...... Slider 205 ...... Bobbin 206 ...... Coil 207 ...... Jig 208 ...... Leaf spring 209 ...... Ball 210 ...... 211 …… Positioning member 300 …… Second sliding means 301 …… Yoke 302 …… Permanent magnet 303 …… Yoke 304 …… Slider 305 …… Bobbin 306 …… Coil 307 …… Jig 308 …… Leaf spring 309 …… … Ball 310 …… Screw 311 …… Positioning member

Claims (1)

[Claims] 1. A data recording / reproducing apparatus for recording and / or reproducing data to and from an optical card, comprising: a supporting means for supporting and fixing the optical card during data recording / reproducing; and a recording / reproducing device for the optical card. A head unit that irradiates a light beam, a first sliding unit that slides the head unit in the vertical or horizontal direction of the optical card, and the first sliding unit in a direction perpendicular to the sliding direction. Second sliding means for sliding, and the first sliding means and the second sliding means move the head portion to a desired position on the optical card to record and reproduce data. A data recording / reproducing apparatus for an optical card, characterized in that