JPH07169178A - Card type optical recording medium - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the relative positioning error of an optical card and to perform stable recording/reproducing in a high or low temperature environment by providing a reverse mark on the optical card side instead of a shielding plate. CONSTITUTION:A reflection type reverse mark reading head (a light source and a sensor) 41 is fixed by a mark reading head fixing shaft 46 so as to intersect on the reverse mark 4 when the optical card 1 is moved in direction A in a reproducing device. The head 41 is arranged in the same line as an optical head 51 (moved in direction C on a shaft 53 by a motor 52) for performing the recording/reproducing of a card. By moving the card in the direction of arrow A, reflected light is read on the mark 4 and a pulse signal is generated, thereby detecting a reverse position. Since the reverse mark and the card are simultaneously expanded and contracted, deviation is not caused between recording/ reproducing starting and finishing positions, and the stable recording/ reproducing is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card-shaped optical recording medium for optically recording / reproducing information, and particularly to a recording / reproducing start / end position even when the optical card recording device is operated in a high temperature environment. The present invention relates to a card-shaped optical recording medium capable of stable recording / reproducing without causing a shift and reducing the size and cost of the device.

[0002]

2. Description of the Related Art In recent years, with the progress of informationization in society, an information recording medium such as an optical disk, an optical card, an optical tape for optically recording or reproducing information and an information recording as a means for efficiently handling a wide variety of information. Many playback devices have been proposed. Binary information is reflected on the information recording medium by the change in reflectance, the change in reflected light intensity due to changes in surface shape such as the presence or absence of pits (holes), and the change in polarization plane due to the magneto-optical effect. Some can be detected by converting them into intensity changes. A characteristic of these information recording media is that they have a high recording density and can be recorded and reproduced in a non-contact manner, so that they have a long life.

Recently, a card type optical information recording medium (hereinafter referred to as an optical card) which is excellent in portability and has a large capacity compared to its size has been actively researched and developed, and a proposal has been made. There is.

FIG. 4 shows a conventional DRAW (direct read after write).
FIG. 3 is a schematic plan view showing a recording format of an (after write) type optical card. In FIG. 4, a recording area 2 is provided on an optical card 1 which is a recording medium, and a plurality of tracks 3 each having an information capacity of several thousand bytes are arranged in the recording area 2.

FIG. 5A is a schematic configuration diagram of a method of reproducing information recorded on an optical card. FIG. 5B is the same as FIG.
It is sectional drawing in the DD line of (a). In FIG. 5A, the optical card 1 is placed on an optical card moving table 59 (hereinafter referred to as “shuttle”) at a fixed position and moves in the direction of arrow A. Although not shown, the shuttle can be moved by a linear motor, for example. While moving in the A direction, the information recorded on the optical card 1 is read and reproduced by the optical head 51 for each track 3. First, the light from the light source 57 such as a semiconductor laser is condensed by the lens system 58 and applied to the track 3 on which information is recorded. The irradiated recording information of the track 3 is imaged on the sensor 50 by the imaging optical system 60, and an electric signal corresponding to the information recorded on the track 3 is output from the sensor 50. When reading tracks continuously, when the reading of the track 3 is completed, the optical card stops at a predetermined position and the optical head 5
1 moves one track in the direction of arrow C, and the optical card is A '
Moving in the direction, information reading of the next track is performed. The operation of moving the optical head 51 in the direction of arrow C is called seek. After the information on the normal track 3 is read, the position where the optical card stands still, the optical head seeks, and the shuttle reverses is performed based on a signal from a reverse positioning unit attached to the recording / reproducing apparatus. The conventional reverse positioning unit includes a sensor 44 such as a CCD, a light source 42 such as an LED, and a shielding plate 43, as shown in FIG. Sensor 44 such as CCD, LED
The light source 42 such as is fixed to the main body of the recording and reproducing device,
The shield is fixed to the lower part of the shuttle between the left and right positions where the shuttle reverses. When the shuttle comes to the stationary reverse position (the same as the seek position), the shield plate disappears and the light emitted from the light source reaches the sensor and emits a signal. This signal causes the shuttle to slow down and stand still.

Usually, the shielding plate is a rectangular metal plate having a width of 10 mm, a length of 75 mm and a thickness of 0.1 mm. A metal such as stainless steel or nickel having high processing accuracy is used as the material. However, while the thermal expansion coefficient of PMMA or polycarbonate, which is the optical card substrate material, is about 8 × 10 ⁻⁵ , the thermal expansion coefficient of metals such as stainless steel and nickel is significantly different from 1 × 10 ⁻⁵ . Further, the hygroscopic expansion of metal is almost equal to 0, but the resin such as PMMA has large hygroscopic expansion. Therefore, even if the optical card and the shielding plate are positioned accurately at room temperature, in a high-temperature high-humidity environment or a low-temperature low-humidity environment, due to the difference in thermal expansion coefficient and the difference in hygroscopic expansion coefficient, the relative position is large. You can change. The size of the optical card is estimated to be 85.6 mm, the coefficient of thermal expansion is 7 × 10 ⁻⁵ , and the temperature difference is 30.
A relative position error of 180 μm occurs at ° C. Therefore, when data is reproduced in a high-low temperature environment, the relative position error between the optical card and the shield plate causes a deviation in the recording / reproducing start / end position of the data pit. There was a problem of getting out of the recording area.

Further, the shield plate must be provided under the shuttle with a positional accuracy of ± several tens of μm, which complicates the device manufacturing process.

Further, since the shield plate is provided below the shuttle, the size of the device is inevitable.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to improve the above-mentioned drawbacks of the prior art, and by providing specific position information other than the shield plate on the optical recording medium side, Eliminates the deviation due to the change in temperature and humidity that may occur due to the difference in expansion coefficient between the shield plate and the substrate, improves the recording / reproduction start / end position accuracy, and enables downsizing and low-cost recording / reproduction. It is intended to be operable by the device.

[0010]

The present invention, which achieves the above object, is a card-shaped optical recording medium having a recording area in which information is optically recorded, and is moved in the track reading direction of the recording area. In a card-shaped optical recording medium which is mounted on a card moving table for recording and reproducing information by an optical head, position information for reversing the moving direction of the card moving table has an optical reading mark (outside the recording area). Hereinafter, a card-shaped optical recording medium (hereinafter also referred to as "optical card"), which is provided as a "reverse mark". Since the reverse mark is provided on the optical card side instead of the shield plate, the reverse mark and the optical card expand and contract at the same time even if the temperature and humidity change, and relative position error does not occur. Even when operated in a low temperature environment, the recording / reproduction start / end position is not displaced, and stable recording / reproduction can be performed. Further, since the shuttle reverse shield plate provided under the shuttle of the recording / reproducing apparatus can be eliminated, the apparatus can be downsized and the cost can be reduced.

Further, the present invention is the above card-shaped optical recording medium, wherein the optical reading marks are provided at two places along the track of the recording area. In order to read the recording / reproducing start / end position, if the recording / reproducing device side is provided with two light sources and sensors, it can be realized by one reverse mark, but two reverse marks are provided along the track in the recording area. As a result, since the light source and the sensor of the recording / reproducing apparatus can be provided at one place, the apparatus can be further downsized.

In the present invention, in the above card-shaped optical recording medium, the optical reading mark is provided on the surface of the card-shaped optical recording medium or the surface of the recording area on which the optical recording layer is provided. It is a card-shaped optical recording medium. The reverse mark may be provided on any surface, but it can be easily provided by providing it on the surface of the optical card or the surface of the recording area on which the optical recording layer is provided.

Further, the present invention is the above card-shaped optical recording medium, wherein the optical reading mark is a reflection surface. Reverse mark 4
Can be either a reflective surface or a transmissive surface, but since the visible information area is formed on the back side of the optical recording surface of the optical card, the operation is easy if it is formed of a reflective surface.

The present invention will be described in detail below.

A card-shaped optical recording medium for optically recording and reproducing information, characterized by having a positioning mark for reversing the shuttle outside the recording area.

The present invention will be described in detail below.

Since the optical card of the present invention has a mark for reversing the shuttle (hereinafter referred to as a reverse mark) outside the recording area, the reverse mark and the optical card simultaneously expand even if the temperature and humidity change. Since it contracts, no relative position error occurs. Therefore, even if the optical card recording / reproducing apparatus is operated in a high-low temperature environment to record or reproduce information on the optical card, the recording / reproducing start position of the signal does not deviate, and a stable reproduced signal can be obtained. Further, since the reverse mark is provided on the optical card, the recording / reproducing apparatus does not need a shield plate, and the apparatus can be made inexpensive and compact.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the optical recording medium of the present invention, and FIG. 2 is a sectional view taken along line BB. Next, the present invention will be described by taking the optical card shown in FIG. 1 as an example of the optical recording medium. In FIG. 1, an optical card 1 of the present invention has a recording area 2 having a preformat and a reverse mark 4 on its outer peripheral portion.

The reverse mark 4 can be either a reflective surface or a transmissive surface, but since a magnetic recording area and a visible information area such as a face photograph are usually formed on the back side of the optical recording surface of the optical card, It is desirable that the reflective surface be formed. In that case, the light source and the sensor of the recording / reproducing apparatus for reading the reverse mark must be located on the same side as the optical head.

The reverse mark can be formed on any surface of the laminated structure, but the surface 5 of the optical card can be formed.
It is preferable to form (on the surface on the optical head side) or on the surface on which the optical recording layer 10 is formed (optical recording surface 7) in terms of work efficiency, reading efficiency, and the like. The forming method is a vacuum film forming method such as a vacuum vapor deposition method or a sputtering method, or a coating method such as roll coating or calendar coating.
When forming the preformat pattern and the optical recording layer on the substrate of the optical card, the method of forming the light reflection area of the reverse mark at the same time, or the surface of the substrate opposite to the surface on which the optical recording layer is formed (of the optical card There is a method of forming a film of a reflective material such as a metal or a method of adhering the reflective material on the surface) through a mask having a reverse mark shape.
The shape and material of the reverse mark may be any shape or material as long as it has a size and optical characteristics capable of reflecting light and allowing the sensor to identify the reverse position. For example, when the reverse mark is formed at the same time as the optical recording layer, the same material as that of the optical recording layer can be used, and other methods such as forming a reflective thin film of metal or the like may be used. . Also, when forming a reverse mark on the surface of the optical guard, a metal such as aluminum, gold or nickel,
Alternatively, a polymer film in which the above-mentioned metal is vacuum-deposited can be used. The thickness of the reverse mark made of these materials is not particularly limited, but is usually 0.01 to 50 μm.
About m, when the film is formed at the same time as the optical recording layer, the same thickness as that of the layer is preferable. The shape of the reverse mark is also not particularly limited, but is, for example, 0.5 to 10 mm x 0.5 to 10 mm.
For example, a quadrangle having a size of about 0.5 mm or a circle having a diameter of about 0.5 to 10 mm can be used.

The laminated structure of the optical card of the present invention can be the same as that of the prior art. That is, in FIG. 2, the protective layer 11 is attached to the transparent substrate 8 provided with the optical recording layer 9 via the adhesive layer 10.
Of course, other than this, a reflective layer or the like may be provided if necessary.

Next, other configurations will be described. As the transparent substrate, those having less inconvenience in optical recording / reproduction are preferable, and in the case of forming the track groove, a material having good moldability thereof is preferable, for example, acrylic resin, polycarbonate resin, polyester. resin,
A vinyl resin, a polyimide resin, a polyacetal resin, a polyolefin resin, a polyamide resin, a cellulose derivative or the like can be used. The thickness of the substrate is usually 0.1 to 0.7 mm, and the thickness of the adhesive layer is 20 to 50 μm.
About m is preferable.

As the material used for the recording layer, the wavelength of the reproducing energy beam is 650 nm or more, especially 70
In the case of ˜900 nm, it is preferable that the difference between the reflectance in the pit which is the recorded portion and that in the unrecorded portion is large. Further, it is preferable that the energy required for changing the reflectance due to the irradiation of the energy beam for recording is small. Further, it is preferable that the reflectance of the recorded portion and the unrecorded portion hardly change by the reproducing energy beam.

For example, Te, Sb, Mo, Ge, V, S
oxides such as n, GeSnTe, InSnTe, Te-S
A compound such as n, TeOx-Ge or the like undergoes a phase transition upon irradiation with an energy beam to change its reflectance. Also,
_{Te-CH 4, Te-CS} 2, Te- styrene, Sn-S
O _2, GeS-Sn, composite of SnS-S metal and an organic compound such as an inorganic sulfide or, SiO ₂ / Ti / S
multi-layer film such as iO ₂ / AI can also be used. Further, it is also possible to use a material in which metal particles such as silver are dispersed in a thermoplastic resin such as nitrocellulose, polystyrene or polyethylene, or a material in which metal particles are agglomerated on the surface of such a thermoplastic resin. Moreover, a chalcogen or coloring type of _{MoO 3 -Cu, MoO 3 -Sn-} Cu or the like may be used, in some cases, it is possible to use multi-layer body of the organic thin film and the metal thin foam-forming.

Further, an organic thin film whose optical properties can be changed by an energy beam can also be used. , Cyanine compounds, merocyanine compounds, pyrylium-based compounds, xanthene-based compounds, triphenylmethane-based compounds, croconium-based dyes, dyes such as crocones, and the like. It is preferred for the invention.

Next, a protective member is laminated on the transparent substrate on which the recording layer is formed according to the mode of use with an adhesive. As the adhesive layer, conventionally known adhesives, for example, vinyl acetate, acrylic acid ester, vinyl chloride, ethylene, acrylic acid, polymers and copolymers of vinyl monomers such as acrylamide, polyamide, polyester, epoxy-based adhesives, etc. Thermoplastic adhesive, amino resin (urea resin, melanin resin), phenol resin, epoxy resin, urethane resin, thermosetting vinyl resin, etc. adhesive, natural rubber, ethryl rubber, chloro rubber, silicone rubber, etc. Is used. In particular, the hot melt type is a dry process and is preferable in consideration of mass production and continuous production.

The protective member is required to be transparent in the case of a transmissive reading system, and the requirement for birefringence is the same as that for the substrate, and its material is limited by itself. If it is a reflective reading method, the protective member may be opaque,
The material can be selected from a wide range. The protective member may be laminated on the recording layer directly in optical contact with the recording layer. Further, a so-called air gap type configuration in which a protective member is provided via an air layer as necessary may be adopted.

FIG. 3 is a schematic view of an apparatus for recording / reproducing the optical card of the present invention. A reflection type reverse mark reading head (light source and sensor) 41 is fixed to the reproducing device by a reverse mark reading head fixing shaft 46 so as to traverse over the reverse mark 4 when the optical card 1 is moved in the direction A. ing. The reverse mark reading head 41 is an optical head 5 for recording / reproducing an optical card.
1 (the optical head drive motor 52 drives the optical head drive shaft 5
3 slides in the direction of arrow C) and can be installed in the same row. When the optical card moves in the direction of arrow A and the reverse mark reading head 41 is positioned on the reverse mark 4 provided on the card, the reflected light is read and a constant pulse signal is generated to detect the reverse position of the card. can do.

[0030]

EXAMPLES The present invention will be described more specifically below with reference to examples.

Example 1 The optical card shown in FIGS. 1 and 2 was manufactured as follows. As the transparent substrate 8, a polymethylmethacrylate substrate having a size of 85.6 × 54.0 mm and a thickness of 0.4 mm was washed and dried. A preformat pattern was formed on the substrate by the hot pressing method. Next, tellurium was deposited on the preformat pattern to a thickness of 400 A by a vacuum deposition method through a mask having a pattern of the recording area 2 (32 × 80 mm) and the reverse mark 4 (2 × 5 mm) in FIG. 9 and the reverse mark were formed at the same time. Next, with the adhesive 10 made of a hot-melt type ethylene-vinyl acetate copolymer, the above-mentioned substrate on which the recording layer is formed,
Linear encoder arranged on the outer periphery of the recording area, protective layer 11 of polymethylmethacrylate having a thickness of 0.3 mm
Was laminated in this order and bonded by a hot press to obtain an optical card. As a result of recording / reproducing on the optical card thus manufactured, even in an environment of high temperature (-5 to 60 ° C),
It was confirmed that the start / end position error of recording / reproduction, which has been generated in the past, does not occur due to the relative position error between the shield plate and the optical card. Further, the recording / reproducing apparatus can be simplified and downsized because there is no shield plate.

Example 2 The optical card shown in FIGS. 1 and 2 was manufactured as follows. As the transparent substrate 8, a polymethylmethacrylate substrate having a size of 85.6 × 54.0 mm and a thickness of 0.4 mm was washed and dried. On top of that, as a phase transition type recording layer 9, Sb ₂ T
e ₂ Ge ₅ alloy with RF magnetron sputtering to a thickness of 2
The film was formed to 0 nm. The recording layer after sputtering was in an amorphous state. A photomask provided with a preformatted pattern is adhered to the recording layer, and the KrF laser beam is irradiated for 1 second to cause the laser beam irradiated portion to undergo a phase transition from amorphous to crystalline to form a preformatted pattern. It was set as the recording area.

Then, the substrate was turned upside down, and aluminum was patterned to a thickness of 2000 A at a position of the reverse mark of FIG. 1 by vacuum vapor deposition with a size of 2 × 5 mm. Next, a protective layer 11 made of polymethylmethacrylate having a thickness of 0.3 mm was bonded by an adhesive 10 made of a hot-melt type ethylene-vinyl acetate copolymer to obtain an optical card.

As a result of recording and reproducing on the optical card thus manufactured, the recording which has conventionally occurred due to the relative position error between the shield plate and the optical card even in an environment of high temperature and low temperature (-5 to 60 ° C.). It was confirmed that the start / end position error of reproduction did not occur. Further, the recording / reproducing apparatus can be simplified and downsized because there is no shield plate.

[0035]

As described above, by providing the reverse mark on the optical card side instead of the shield plate, the reverse mark and the optical card simultaneously expand and contract even if the temperature and humidity change, and the relative position error is reduced. Since it does not occur, even if the optical card recording / reproducing apparatus is operated in a high-low temperature environment, the recording / reproducing start / end position is not displaced, and stable recording / reproducing can be performed.
Further, since the shuttle reverse shield plate provided under the shuttle of the recording / reproducing apparatus can be eliminated, the apparatus can be downsized and the cost can be reduced.

Further, in order to read the recording / reproducing start / end position, if a light source and a sensor are provided at two places on the recording / reproducing apparatus side, this can be realized by one reverse mark, but two reverse marks are provided at the recording area. By providing along the track, the light source and the sensor of the recording / reproducing apparatus can be provided in one place, so that the apparatus can be further downsized.

The reverse mark may be provided on any surface, but it can be easily provided by providing it on the surface of the optical card or the surface of the recording area on which the recording layer is provided.

The reverse mark 4 may be either a reflective surface or a transmissive surface, but since the visible information area is formed on the back side of the optical recording surface of the optical card, it is said that it is formed of a reflective surface. Operation becomes easy.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of a card-shaped optical recording medium of the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of a card-shaped optical recording medium of the present invention.

FIG. 3 is a schematic plan view showing the relationship between an apparatus for reproducing information from the card-shaped optical recording medium of the present invention and the card-shaped optical recording medium.

FIG. 4 is a schematic plan view showing a conventional general card-shaped optical recording medium.

5A and 5B are explanatory views showing a configuration of an apparatus for reproducing information on a conventional card-shaped optical recording medium, where FIG. 5A is a front view and FIG.
[Fig. 6] is a side view of the shuttle portion.

[Explanation of symbols]

1 Optical Card 2 Recording Area 3 Track 4 Reverse Mark 5 Optical Card Front Surface 6 Optical Card Back Surface 7 Optical Recording Surface 8 Transparent Substrate 9 Recording Layer 10 Adhesive Layer 11 Protective Layer 41 Reverse Mark Reading Head (Light Source and Sensor) 42 Light Source 43 Shield Plate 44 sensor 46 fixed axis of reverse mark reading head 50 sensor 51 optical head 52 optical head drive motor 53 optical head drive axis 57 light source 58 lens system 59 optical card moving stand (shuttle) 60 imaging optical system

Claims (4)

[Claims] 1. A card-shaped optical recording medium having a recording area in which information is optically recorded, the optical recording medium being mounted on a card moving table which moves in a track reading direction of the recording area to store information by an optical head. In a card-shaped optical recording medium for recording and reproducing, position information for reversing the moving direction of a card moving table is provided as an optical reading mark outside the recording area, and a card-shaped optical recording medium. recoding media. 2. The card-shaped optical recording medium according to claim 1, wherein the optical reading marks are provided at two places along the track of the recording area. 3. The card-shaped optical recording medium according to claim 1, wherein the optical reading mark is provided on the surface of the card-shaped optical recording medium or the surface of the recording area on which the recording layer is provided. 4. The method according to any one of claims 1 to 3,
A card-shaped optical recording medium in which the optical reading mark is a reflective surface.