KR930003620B1 - Recording and reproducing device - Google Patents

Abstract

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Description

Recorder

1 is a side view showing a schematic configuration of main parts of a recording and reproducing apparatus of the present invention.

2 to 5 are diagrams for explaining the construction principle and operation principle of the recording and reproducing apparatus of the present invention shown in FIG.

6 to 8, 11, 17, and 18 are block diagrams of portions of different implementation states other than the recording / reproducing apparatus of the present invention.

9 and 10 are enlarged cross-sectional views showing the structure of a recording medium.

12 and 13 are diagrams for explaining the construction principle and operation principle of the recording and reproducing apparatus of the present invention shown in FIG.

14 is a block diagram for explaining a problem.

15 and 16 are block diagrams of a recording / reproducing apparatus.

* Explanation of symbols for main parts of the drawings

1,2: laser light source 10: light modulator

11,12: wave plate 27,35: transparent electrode

28,31: alignment film 38: transfer table

48,49: polarizer

The present invention relates to a recording and reproducing apparatus, in particular to a recording and reproducing apparatus capable of recording and reproducing an information signal at a high recording density.

As the demand for recording various information signals at high recording density increases, it is well known that high-density recording and reproducing of information signals has recently been performed using recording media made on the basis of various construction principles and operating principles.

In addition, in various technical fields, by irradiating a recording beam intensity-modulated by an information signal to a recording layer of a recording medium, a physical change in accordance with the information signal is applied to the recording layer of the recording medium. Research has been conducted on recording media that record chemical signals by generating chemical changes.

It is well known that various optical discs have already been put to practical use or research and development has been carried out for practical use as long as high-density recording and reproducing are carried out using laser light in which a semiconductor laser which performs stable operation is easily obtained in recent years.

In other words, recording-finished optical discs (reproduction-only optical discs), which are reproduced in large quantities on a disc on which information signals are recorded by pits formed of geometric recesses or convex portions, are spreading to general homes, for example, as video discs or compact discs. In addition, optical discs (recordable optical discs) and erasable optical discs that can be added and recorded only once by a rich person are actively researched and developed for practical use in, for example, office file memory and other uses. As the recordable optical disk or the erasable optical disk, the pit forming type or the uneven forming type, the magneto-optical type, the phase change type (the thermal transformation type in which the change of light transmittance, reflectance, absorption, etc. due to heat energy) In addition to the various types of the same, recording and reproducing operations use energy other than light. Many proposals have been made for recording media to be used.

By the way, in the above-described conventional recording / reproducing apparatus using various recording media, the structure of the apparatus for performing high density recording is complicated, large-scale, and an erasable recording medium is conventionally proposed as described above, but it is, for example, magnetic recording. While the erasing is easy in the case of the medium, there is a problem in terms of high density recording. For example, in the case of an optical disc, the high density recording is easy, but there is a problem that the erasing cannot be performed by simple means.

Therefore, the present applicant first forms a charge pattern corresponding to an information signal to be recorded by using laser light on a recording medium made of a member and an optical support material having optical anisotropy in a crystal axis or orientation, and a charge support layer, and the laser light A recording and reproducing apparatus as shown in Figs. 15 and 16, which reads the charge pattern formed on the recording medium using the above, has been proposed.

Claim 15 as a road and D1 is the recording medium in claim 16 degrees, the recording medium D1 shown in the drawings the optical modulator having the optical anisotropy such as a transparent electrode Et ₁ and a photoconductive layer member PCL and the dielectric mirror DML, a crystal axis or orientation A member composed of a material, that is, an optical modulator layer member PML ', for example, an electro-optic crystal such as niobium-sium single crystal or bismuth silicate (BSO), or a material such as a liquid crystal is used, and a transparent electrode Et ₂ and The schematic structure is shown as having a laminated structure of.

In the case where the light modulation material layer member PML used as the constituent member is a liquid crystal, the specific cross-sectional structure of the recording member D1 is shown in FIG. 9, and the light modulation material layer member PML used as the constituent member is, for example, niobiumtridium single crystal or silicic acid. In the case of an electro-optic crystal such as bismuth (BSO), the specific cross-sectional structure of the recording member D1 is shown in FIG. 10, and in FIG. 9, 25, 26, 33 are glass substrates, 27, 35 are transparent electrodes, 28, 31 Silver alignment film, 29 and 30 are spacers, 32 is a dielectric mirror, 34 is a charge support layer, PML is a liquid crystal, PCL is a photoconductive layer, and in FIG. 10, 25 and 26 are glass substrates, 27 and 35 are transparent electrodes, and 32 are Dielectric mirror, 34 is a charge support layer, PML is an electro-optic crystal such as, for example, niobiumtriumium single crystal or bismuth silicate (BSO), and PCL is a light conductive layer.

(1) When the recording medium D1 enters the writing light intensity-modulated by the information signal on the transparent electrode Et ₁ in a state where a constant voltage is applied between the transparent electrodes Et ₁ and Et _{2 on} both sides thereof, The amount of electric charges corresponding to the strength and weakness of the above-described writing light accumulates at the boundary between the dielectric mirror DML where the electrical resistance value of the photoconductive layer member PCL in the portion where the writing light is incident is in accordance with the intensity of the above-described writing light. (In the specific structural diagrams shown in FIG. 9 and FIG. 10, the same applies to other parts described in that charge is accumulated in the charge support layer 34). (2) The recording medium D1 writes when the voltage applied between the transparent electrodes Et ₁ and Et _{2 on} both sides thereof is changed while the writing light having a constant light intensity is incident on the transparent electrode Et ₁ side thereof. Light is incident and an amount of electric charge corresponding to the voltage value applied between the transparent electrodes Et ₁ and Et ₂ described above is accumulated at the boundary with the dielectric mirror DML at the portion where the electric resistance value of the photoconductive layer member PCL is changed.

Therefore, the recording medium D1 having the above-described configuration intensifies the write light by the information signal in the state as described above (1) or between the transparent electrodes Et ₁ and Et ₂ in the state as described above (2). By intensity-modulating the voltage by the information signal, the amount of electric charge corresponding to the above-described information signal can be accumulated at the boundary with the dielectric mirror DML at the portion where light is incident and the electrical resistance of the photoconductive layer member PCL is changed.

The light incident on the photoconductive layer member PCL through the transparent electrode Et ₁ as the above-described writing light with the above-described recording medium D1 moved is made of the above-mentioned (1) or (2). When the information signal is recorded by one method, the light is incident on the charge due to an amount corresponding to the above-described information signal accumulated at the boundary with the dielectric mirror DML at the portion where the electrical resistance of the photoconductive layer member PCL has changed. The pattern can have a very high resolution.

As described above, the charge image accumulated at the boundary with the dielectric mirror DML in the photoconductive layer member PCL, i.e., the charge image whose charge amount changes along the information signal to be written, is short-circuited between the transparent electrodes Et ₁ and Et ₂ described above. As light is incident on the transparent electrode Et ₂ side as a state, it can be reproduced as an optical image.

That is, when the read light is made incident on the transparent electrode Et ₂ side of the recording medium D1 by making the above-mentioned transparent electrodes Et ₁ and Et ₂ be short-circuited, the read light is an optical modulator layer member PML such as an electro-optic crystal or liquid crystal. After passing through it, it is reflected by the dielectric mirror DML and passes again through the light modulation layer member PML and exits from the transparent electrode Et ₂ side, but the above-mentioned light modulation layer member PML such as the electro-optic crystal or liquid crystal is applied to the electric field applied thereto. As the optical properties change, the light emitted from the transparent electrode Et ₂ as described above is in a state where the state of light changes depending on the charge phase accumulated at the boundary with the dielectric mirror DML in the photoconductive layer member PCL.

Therefore, a change in the state of light emitted from the transparent electrode Et _2, in which the state of light is changed in accordance with the charge image accumulated at the boundary with the dielectric mirror DML formed on the photoconductive layer member PCL, can be recognized as an image of light while converting the state of light into intensity of light. and, if it photoelectrically converted, it can be an electrical signal, if the photoelectric converting light emitted from the transparent electrode Et ₂ obtained by the boiling point scanning by the reading light can also be a video signal. If a very small diameter is used as the read light, a video signal capable of reproducing a high resolution reproduced image can be generated. It is possible to easily realize that the light spots of the writing light and the reading light are made small by using laser light.

As described above, charges accumulated at the boundary with the dielectric mirror DML in the photoconductive layer member PCL are short-circuited between the transparent electrodes Et ₁ and Et ₂ , whereby light of a constant intensity is incident on the transparent electrode Et ₁ side and the light conductive layer It can erase by lowering the electric resistance value of the member PCL.

In FIG. 15, the component part shown on the right side of the recording medium D1 is a component part constituting the recording system and the erasing system, and the component part shown on the left side of the recording medium D1 is the component part constituting the reproduction system. At 15 degrees, 1 and 2 are laser light sources, 3 to 7 lenses, 8 and 9 are polarizers, 10 are optical modulators, 11 and 12 are waveplates, 13 and 14 are analyzers, 15 are beam splitters, 16 are photoelectric converters. , 17 is an amplifier, 18 is an output terminal, 19 and 20 are switching switches, 21 is a signal source (signal source) of the information signal to be recorded, and 22 is a predetermined value between the transparent electrodes Et ₁ and Et ₂ of the recording medium D1. It is a power source for applying voltage.

The above-mentioned switching switches 19 and 20 switch their movable contact v to the fixed contact a side when the recording and reproducing apparatus is in the recording mode, and its movable contact v is the fixed contact b when the recording and reproducing apparatus is in the reproducing mode. It is switched to the side. The movable contact v of the above-described switching switch 20 switches its movable contact v to the fixed contact b side even when the recording / reproducing apparatus is in the erase mode.

The operation in the case where the recording / reproducing apparatus of Fig. 15 is set to the writing mode will be described as follows. In other words, when the recording / reproducing apparatus is in the recording mode, the recording medium D1 is driven and rotated at a predetermined rotational speed, and the component part of the recording system is conveyed at a predetermined conveying speed in the radial direction of the recording medium D1 by a conveying mechanism (not shown). And the movable contact a of the switching switches 19 and 20 is switched to the fixed contact a side, whereby a predetermined voltage is supplied from the power supply 22 between the transparent electrodes Et ₁ and Et ₂ of the recording medium D1, The information signal is supplied to the optical modulator 10 from the signal source 21 of the information signal. The laser light source 2 in the regeneration system is in a non-operational state.

Since the laser light emitted from the laser light source 1 becomes parallel light by the lens 3, the light is incident on the optical modulator 10 by the polarizer 8 and becomes linearly polarized light having a transparent polarization plane. It is optically modulated by the information signal supplied from the signal source 2 of the information signal.

The laser beam emitted from the optical modulator 10 is incident on the analyzer 13 because it is optically set through the wave plate 11, and the analyzer 13 is intensity modulated by an information signal. The laser beam of light is emitted. The laser beam emitted from the analyzer 13 is collected by the lens 4 and passes through the transparent electrode Et ₁ of the recording medium D1 and enters the photoconductive layer member PCL.

Thereby, the electrical resistance value of the incident portion of the laser beam in the photoconductive layer member PCL changes according to the amount of light in the laser beam, and at the boundary with the conductor mirror DML in that portion, a charge having a charge amount corresponding to the information signal is placed. Accumulated and the information signal to be recorded is recorded in the electric charge phase.

Next, when the recording / reproducing apparatus of FIG. 15 is in the reproducing mode, the laser light source 1 of the recording system is in an inoperative state, and the movable contact v of the switching switch 20 is switched to the fixed contact b side.

The laser light for reading radiated from the laser light source 2 for reproduction becomes a parallel tube by the lens 6, so it is incident on the polarizer 9, and the polarizer 9 emits linearly polarized light having a specific polarization plane. . The laser beam emitted from the polarizer 9 passes through the beam splitter 15, is focused by the lens 5, and enters the transparent electrode Et ₁ in the recording medium D1.

As described above, the laser beam for reading incident on the transparent electrode Et ₁ in the recording medium D1 passes through an optical modulator layer member PML such as an electro-optic crystal or a liquid crystal, and is then reflected by the dielectric mirror DML to again reflect the optical modulator layer member PML. It passes through and exits from the transparent electrode Et ₂ side.

Since the optical properties of the optical modulation material layer member PML such as the electro-optic crystal or liquid crystal change depending on the electric field applied thereto, the light emitted from the transparent electrode Et ₂ as described above is a light conductive layer during the recording operation. The polarization plane is in a state where the polarization plane changes depending on the charge image accumulated at the boundary of the dielectric mirror DML in the member PCL.

Light emitted from the transparent electrode Et ₂ of the recording medium D1 is incident on the reflected wave plate 12 by the beam splitter 15. This wave plate 12 is used to optically set the bias. The laser beam emitted from the wavelength plate 12 enters the photoelectric converter 16 by changing the state of the polarization plane in the laser beam by the analyzer 14 to the contrast, and enters it in the photoelectric converter 16. An electrical signal is output in accordance with the intensity change of the laser beam, which is amplified by the amplifier 1 'and output to the output terminal 18.

Next, the erasing operation of recording end information in the recording / reproducing apparatus of FIG. 15 will be described. When the recording and reproducing apparatus is in the erase operation mode, the reproducing laser light source 2 is in a side effect state, the movable contact v of the switching switches 19 and 20 is switched to the fixed contact b side, and the recording laser light source 1 is It becomes the operating state.

In the above state, the laser light emitted from the laser light source 1 becomes parallel light by the lens 3, so that the light polarizer 8 becomes linearly polarized light having a specific polarization plane, and thus the light modulator 10 → wavelength plate ( 11) → the analyzer 13 → the optical path, and the analyzer 13 emits a laser beam having a constant light intensity, and the laser beam is condensed by the lens 4 to transmit the transparent electrode Et of the recording medium D1. _Is incident on ₁ .

The laser light beam incident to the transparent electrode Et of the recording medium D1 is ₁ through the transparent electrode Et ₁ and is incident on the photoconductive layer member PCL. The photoconductive layer member PCL changes to a constant low resistance value by the laser beam of a constant amount of light without electrical resistance of the incident portion of the laser beam, so that the charge accumulated at the boundary between the dielectric mirror DML and the photoconductive layer member PCL → transparent electrode Et ₁ → The circuit is removed from the fixed contact b → the movable contact v → ground of the switch 20, and the erase operation is performed. By the way, in the case where the recording medium D1 is the recording medium at the end of the recording, the erasing must be performed prior to the recording operation by the new recording information. However, as in the embodiment of FIG. When the laser light source is the same laser light source 1, and the optical path of the laser light beam radiated from the laser light source 1 is the same in the recording mode (write mode) and the erase mode, the previous erasing operation and the writing to write new information are performed. The operation may be time-divided.

Next, the recording medium D1, which has been used for recording and reproducing the information signal in the above-described recording and reproducing apparatus of FIG. 15, cannot permit the dielectric mirror DML used in its configuration to pass through the ball. Although the reading was performed on each opposite side of the recording medium D1, the recording and reproducing apparatus of the structural example shown in FIG. 16 is a medium D1 used for recording and reproducing the information signal. In the same aspect, the transparent electrode Et, the photoconductive layer member PCL, the dielectric mirror DMLr having wavelength selectivity for passing the write light and the erased light and reflecting the read light, for example, niobium In the case of using a recording medium D1 having an electro-optic crystal such as an acid single crystal or a light modulation material layer member PML such as a liquid crystal and a laminated structure of the electrode 2 It shows an example.

In FIG. 16, 1,2 is a laser light source, 3,4,6,7 is a lens, 8 is a polarizer, 10 is a light modulator, 12 is a wave plate, 13,14 is an analyzer, 23,24 is a beam splitter, 16 is a photoelectric converter, 17 is an amplifier, 18 is an output terminal, 19 and 20 are switching switches, 21 is a signal source (signal source) of the information signal to be recorded, and 22 is between the transparent electrode Et and the electrode E of the recording medium D1. It is a power supply for supplying a predetermined voltage to the.

The switching switches 19 and 20 switch their movable contact v to the fixed check a side when the recording and reproducing apparatus is in the recording mode, and its movable contact v to the fixed contact b side when the recording and reproducing apparatus is in the reproducing mode. It is switched. The movable contact v of the changeover switch 20 switches its movable contact v to the fixed contact b side even when the recording / reproducing device is in the erase mode.

The operation in the case where the recording / reproducing apparatus of Fig. 16 is set to the recording mode will be described as follows. In other words, when the recording / reproducing apparatus is set to the recording mode, the recording medium D1 is driven and rotated at a predetermined rotational speed, and the constituent parts of the recording system, the reproducing system, and the erasing system are moved in the radial direction of the recording medium D1 by a feeding mechanism not shown. Is transferred at a predetermined feed rate, and the movable contact a of the switching switches 19 and 20 is switched to the fixed contact a side, whereby a predetermined voltage is supplied from the power supply 22 between the transparent electrode Et and the electrode E of the recording medium D1. Is supplied, and the information signal from the signal source 21 of the information signal to be recorded is supplied to the optical modulator 10. The laser light source 2 in the regeneration system becomes inoperative.

Since the laser light emitted from the laser light source 1 becomes parallel light by the lens 3, it becomes linearly polarized light having a specific polarization plane by the polarizer 8 and is incident on the light modulator 10, thus to be recorded above. The light is modulated by the information signal supplied from the signal source 21 of the information signal.

The laser beam emitted from the optical modulator 10 is incident on the analyzer 13 because the optical bias is set by a wave plate (not shown) as necessary, and the analyzer 13 receives an information signal. The laser beam in the intensity modulated state is emitted. The laser light beam emitted from the analyzer 13 is incident on the lens 4 via the beam splitters 23 and 24, and is collected by the lens 4, and the transparent electrode Et of the recording medium D1 and the light modulator member PML and Through the dielectric mirror DMLr having the wavelength selective characteristic, it is made to enter the photoconductive layer member PCL (the laser beam emitted from the lens 4 is illustrated by the dotted line in FIG. 16).

As a result, the electrical resistance value of the incident portion of the laser beam in the photoconductive layer member PCL changes according to the amount of light in the laser beam, and charges having a charge amount corresponding to the information signal accumulate at the boundary of the dielectric mirror DMLr in the portion. The information signal to be recorded is recorded as a charge image.

Next, when the recording / reproducing apparatus of FIG. 16 enters the reproducing mode, the laser light source 1 of the recording (shared with the laser light source of the erasing system) is in a side effect state, and the movable contact v of the switching switch 20 is fixed. It switches to the contact b side.

The laser light for reading (reading light) radiated from the laser light source 2 for reproduction becomes parallel light by the lens 6, and thus enters the lens 5 via the beam splitters 23 and 24, and the lens It is focused by (5) and enters the transparent electrode Et in the recording medium D1.

The laser beam for reading incident on the transparent electrode Et in the recording medium D1 as described above passes through the optical modulator layer member PML, such as an electro-optic crystal or liquid crystal, and then reflects as a dielectric mirror DMLr, and passes again through the optical modulator layer member PML. Is emitted from the transparent electrode Et side (refer to the ray of solid line shown in FIG. 16).

The optical modulator member PML, such as the magneto-optical crystal or liquid crystal, has an optical property that changes depending on the electric field applied thereto, so that the light emitted from the transparent electrode Et in the above-described manner is a light conductive layer member in the recording operation. The polarization plane changes depending on the charge phase accumulated at the boundary with the dielectric mirror DMLr in the PCL.

Light emitted from the transparent electrode Et of the recording medium D1 passes through the lens 5 and the beam split 24 to enter the wavelength plate 12. This wave plate 12 is used to optically set the bias. The laser beam emitted from the wave plate 12 enters the photoelectric converter 16 by the analyzer 14 with the state of change of the polarization plane in the laser light beam being in a dark and dark state. An electrical signal is output in accordance with the change in the intensity of the incident laser beam, which is amplified by the amplifier 17 and output to the output terminal 18.

Next, the erasing operation of recording end information in the recording and reproducing apparatus shown in FIG. 16 will be described. When the recording and reproducing apparatus is in the erase operation mode, the reproducing laser light source 2 becomes inoperative, the movable contact v of the switching switches 19 and 20 is switched to the fixed contact b side, and the recording laser light source 1 This operation state is entered.

In the above state, the laser light emitted from the laser light source 1 becomes parallel light by the lens 3, so that the light modulator 10 → analyzer 13 is linearly polarized light having a specific polarization plane by the polarizer 8. ), The laser beam having a constant light intensity emitted from the analyzer 13 is collected by the lens 4 by passing through the optical path of the beam splitter 23 → beam splitter 24 → and the transparent electrode of the recording medium D1. Incident on Et.

The laser beam for erasing incident on the transparent electrode Et of the recording medium D1 passes through the transparent electrode Et and an optical modulator layer member PML such as an electro-optic crystal or a liquid crystal, and is then reflected by the dielectric mirror DMLr to again reflect the light modulator layer member PML. It passes and exits from the transparent electrode Et side (the laser beam emitted from the lens 4 is illustrated by the dotted line in FIG. 16). In the photoconductive layer member PCL, the electric resistance value of the incident portion of the laser beam for erasing described above is changed to a constant low resistance value by the laser beam of a constant amount of light, so that the charge accumulated at the boundary of the dielectric mirror DMLr is changed to the photoconductive layer member PCL →. The erase operation is performed by removing the circuit from the fixed contact b to the movable contact → ground of the transparent electrode Et to the switch 20.

By the way, in the case where the recording medium D1 is the recording medium at the end of the recording, the erasing must be performed prior to the recording operation by the new recording information, but the recording (writing) laser light source and the erasing laser light source as in the embodiment of FIG. When the same laser light source 1 is used, and the optical path of the laser light beam radiated from the laser light source 1 is the same in the recording mode (write mode) and in the erase mode, the previous erasing operation performed prior to the recording of new information and The recording operation may be time-divided as in the case of the recording / reproducing apparatus of FIG.

By the way, the conventional recording / reproducing apparatus described with reference to FIGS. 15 and 16 forms a charge pattern corresponding to the information signal to be recorded using the laser light on the recording medium D1, and rotates using the laser light. A recording and reproducing apparatus which reads out a charge pattern on a recording medium disc. In this conventionally proposed recording and reproducing apparatus, recording and reproducing operation of an information signal at a high recording density can be realized by the recording medium D1, thereby erasing the recording contents of the recording completion. Although it is characterized in that it is easy, the recording medium used in the recording / reproducing apparatus includes a member made of an optical modulator having optical anisotropy or the like and a charge supporting layer, such as crystal axis or orientation, so that the recording medium is used as a rotating medium disk. When configured, the polarization plane direction of the laser light for recording and reproduction, and As shown in FIG. 14 by the rotation of the disk of rotation, the relationship between the direction of the crystal axis and the direction of orientation of the member composed of an optical modulator having optical anisotropy or the like used in part of the constituent members of the recording medium disk is rotated. As a result, there may be a problem that recording and reproduction cannot be performed well.

The above point will be described with reference to FIG. In FIG. 14, D is a rotating recording medium disk, LS is a laser light source, and FIG. 14 is a state in which the laser light P1 emitted from the laser light source LS is projected onto the rotating recording medium disk D rotating in the direction of the arrow R in the middle. Indicates.

The rotating recording medium disc D shown in FIG. 14 is one of its constituent members, and an optical modulator having optical anisotropy in a crystal axis or orientation is used, and the orientation or orientation of the crystal axis in the optical modulator is The polarizing plane of the laser light radiated by the laser light source LS so that it may be shown as the arrow X of the figure, and the rotation recording medium disk D rotated in the direction of arrow R from the state of FIG. 14 (a) to the state of FIG. 14 (b). Assuming that the direction of the direction is the direction of the arrow PLF of FIG. 14, when the rotating recording medium disc D is rotated in the direction of the arrow R from the state of FIG. 14 (a) to the state of FIG. The crystal in the direction of the arrow PLF of FIG. 14 showing the polarization plane direction of the laser light and the optical modulation material used as one of the constituent members of the rotating recording medium disc D. Direction and the relationship between the 14 ° arrow X indicating the direction of alignment of the first 14 (a) also, the can 14 (b) are different from each other if in As can be seen comparing Figure yangdomyeon.

The information signal is recorded by laser light on a recording medium constructed by using a part of a member made of an optical modulation material having optical anisotropy in crystal axis or orientation, or by projecting the laser light on a recording medium having completed recording. It is necessary to have a specific relationship between the direction of the polarization plane of the laser light and the direction or direction of the crystal axis in the optical modulation material in the recording and playback operation during reproduction. As can also be understood from the description of the apparatus, the crystal axis in the member consisting of an optical anisotropy having optical anisotropy, such as the polarization plane direction of the laser light for recording and reproduction as described above, and the crystal axis or orientation used for a part of the constituent member of the rotating recording medium disc. The relationship between the direction of or the direction of the rotation of the disc By changing by, a solution has been required for being caused to the recording and reproducing can not be satisfactorily performed.

The present invention forms a charge pattern corresponding to an information signal to be recorded using laser light on a disk of a rotating recording medium comprising a member composed of a light modulating material having optical anisotropy, such as a crystal axis or orientation, and a charge support layer. And a recording and reproducing apparatus for reading a charge pattern formed on a rotating recording medium disc using the laser light, the first rotating drive mechanism for driving and rotating the rotating recording medium disc at a predetermined angular speed, and incident on the rotating recording medium disc. A second rotation for setting the position of the laser light to be the rotation center and driving rotation of the rotation center position of the rotation recording medium in the same direction as the rotational angular velocity of the disk of the rotation recording medium and in a direction opposite to the rotation direction of the disk of the rotation recording medium. And a drive mechanism, the polarizing surface of the laser light and the light of the disk of the rotating recording medium. A recording / reproducing apparatus adapted to retain the direction or orientation of crystal axes in a member made of a modulating material in substantially constant relation; a member comprising a light modulating material having optical anisotropy in crystal axes or orientation; A recording and reproducing apparatus for forming a charge pattern corresponding to an information signal to be recorded by using laser light on the same, and for reading out the charge pattern on the rotating recording medium disc by using laser light, as a constituent member of the rotating recording medium disc. By arranging the member made of the light modulating material such that the orientation direction of the member made of the light modulating material used is the circumferential direction or the radial direction of the disk of the rotating recording medium, the polarization plane of the laser light and the orientation of the member of the disk of the rotating recording medium Recording and reproducing apparatus for maintaining the orientation in a substantially constant relationship A charge pattern corresponding to an information signal to be recorded using laser light is formed on a disk of a rotating recording medium made of a member composed of an optical modulator having optical anisotropy in the direction of crystal axis or orientation, and a charge support layer, and the laser light In a recording and reproducing apparatus for reading out a charge pattern on a rotating recording medium disc, the direction of the crystal axis and the orientation of the member made of the optical modulation material used as a constituent member of the rotating recording medium disc is relative to the radial direction of the rotating recording medium disc. A plurality of recording and reproducing areas which are in substantially the same substantially predetermined directions are provided on the rotating recording medium disc, and the direction of the crystal axis in the polarizing plane of the laser light and the optical modulator member of the plurality of recording and reproducing areas described above on the rotating recording medium disc. To maintain a nearly constant relationship Is formed on a rotating recording medium disc composed of an optical modulator member having optical anisotropy and a charge support layer in a recording / reproducing apparatus, a crystal axis or an orientation, and a charge pattern corresponding to an information signal to be recorded by using laser light. In a recording and reproducing apparatus for reading a charge pattern on a rotating recording medium disc, the recording and reproducing apparatus comprises rotating the polarizing plane of laser light in response to rotation of the rotating recording medium disc, thereby comprising a polarizing plane of laser light and an optical modulating material of the rotating recording medium disc. A recording / reproducing apparatus is provided in which the direction of the crystal axis and the direction of the orientation in the member are kept in a substantially constant relationship.

Hereinafter, the present specification will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view showing the schematic structure of the main part of the recording and reproducing apparatus of the present invention, and FIGS. 2 to 5 are diagrams for explaining the construction principle and operating principle of the recording and reproducing apparatus of the present invention in FIG. 8 to 11, 17 and 18 are some block diagrams of different implementation states of the recording and reproducing apparatus of the present invention, and FIGS. 12 and 13 are views of the recording and reproducing apparatus of the present invention of FIG. It is a figure for demonstrating the construction principle and an operation principle.

In Fig. 1, D is a rotating recording medium disk composed of an optical modulator member having optical anisotropy and crystal charge or an anisotropy in a crystal axis or orientation, and this rotating recording medium disk D (hereafter described as a disk D) is used for the motor M1. The turntable TT fixed to the rotary shaft 36 and the clamper 37 are fixed to the turntable TT so as to be integrally rotated. While the turn table TT is shown to have the same size as the disk D in the first way, the turn table TT may be a diameter which is significantly smaller than the diameter of the disk D depending on the implementation.

The motor M1 described above drives and rotates the disk D at a predetermined rotation speed and rotational phase under automatic control by a rotation automatic control system (not shown). The motor M1 is fixed on a feed table 38 having a screw hole that is screwed into the delivery screw 39 coupled to the output rotation shaft of the motor M3.

Therefore, since the conveyance table 38 is engaged with the reel (not shown) provided in the rotating member 40 which is driven and rotated by the motor M2, the motor M3 mentioned above is concise or continuous as a predetermined state. In accordance with the rotation of the dispensing screw 39 by rotation, the feed table 38 is simply or continuously moved in the direction of the arrow U of FIG. 1 according to the reel installed in the rotating member 40.

The above-mentioned rotating member 40 is fixed to the rotating shaft 42 of the motor M2, and has the same number of revolutions as the rotating speed of the motor M1, and is rotated in the reverse rotational direction from the rotating direction of the motor M1. Drive rotation. 43 shows the fixed portion of the body to which the motor M2 is fixed.

41 is a weight for balancing the movement of the rotating member 40 which drives and rotates the rotating shaft 42 of the motor M2 as the center of rotation, and the portion which is integrally driven and rotated with the rotating member 40. In order to balance the movement of the rotating member 40, it is necessary to change the position of the weight 41 in correspondence with the position of the feed table 38 on the rotating member 40, but in FIG. Although the illustration is omitted for the configuration for displacing the weight 41 in accordance with the displacement of the feed table 38 for the purpose, the displacement mechanism of the weight 41 is a motor M3 and the motor M2 by the feed table 38. Like the displacement mechanism, the configuration can be realized.

In the recording / reproducing apparatus of FIG. 1, components of the motor M1, the rotating shaft 35, the turntable TT, and the like form a first rotation driving mechanism for driving and rotating the disk D at predetermined speeds, and the motor M2 and the rotating member. The constituent parts of 40 and the like make the position of the laser light P1 incident on the disk D described above as the rotation center (the position of the rotation shaft 42), which is the same as the rotation angle of the disk D described above, and the rotation direction of the disk D. And a 2nd rotation drive mechanism which drive-rotate the rotation center position mentioned above in the reverse direction.

And a disk D composed of an optical modulator member and a charge support layer having optical anisotropy in a crystal axis or orientation, etc. by forming a recording and reproducing apparatus using the first rotation driving mechanism such as the first diagram and the second rotation driving mechanism. The recording and reproducing operation is performed so that the recording and reproducing operation is performed in a state in which the direction PLF of the polarization plane of the laser light P1 and the direction of the crystal axis or the orientation of the optical modulator member PML of the disk D are maintained in a substantially constant relationship. can do.

That is, the disk D composed of the optical modulator member and the charge support layer having optical anisotropy in the crystal axis or orientation is rotated by only the first rotation driving mechanism, i.e., the disk is driven by the conventional tilt of the disk. Although the problem material in the case where D is rotationally driven is described with reference to FIG. 14, the material used in the configuration of the disk D is shown in FIG. 5, which illustrates the problem material more clearly than FIG. The laser light PL radiated from the laser light source LS to the disk D in which the optical modulator is used as the direction of its crystal axis and the orientation direction is indicated by the arrow X in FIG. In the direction of the arrow PLF of 5 degrees, the disk D is rotated by 90 ° in the direction of the arrow R in the state of FIG. 5 (a). When rotated 90 degrees in the state of 5 (c) and in the direction of the arrow R, the direction of the polarization plane of the laser light P1 emitted from the laser light source LS is always the same as the direction of the arrow PLF in the fifth way, The direction of the crystal axis or the direction of orientation (the direction of arrow X) in the optical modulating material changes as the disk D rotates, as shown in FIGS. 5 (a) to 5 (c), thereby modulating the light on the disk D. The relative relationship between the direction of the crystal axis in the ash or the direction of the alignment (the direction of arrow X) and the direction of the polarization plane of the laser light P1 emitted from the laser light source LS (the direction of the arrow PLF) changes with the rotation of the disk D. do.

The alphabet A shown in FIGS. 5 (a) to 5 (c) is an optical modulator of the disk D when the direction or orientation of crystal axes in the optical modulator in the disk D is the same in front of the disk D. The orientation and orientation direction of the crystal axis in Fig. 1 are described and displayed in order to make it easy to understand what relative change with respect to the direction PLF of the polarization plane of the laser light P1 by the rotation of the disk D.

On the other hand, the recording and reproducing apparatus of the embodiment shown in FIG. 1 of the present invention, as described above, has a first rotary drive mechanism for driving and rotating the disk D composed of the motor M1, the rotating shaft 35, the turntable TT, and the like at predetermined speeds; The position of the laser beam P1 incident on the above-mentioned disk D is made into the rotation center (the center position of the rotating shaft 42), and it is the same as the rotation angular velocity of the disk D mentioned above, and the above-mentioned direction reverse to the rotation direction of the disk D The portion where the laser light P1 is projected even when the disk D is rotated by the rotation of the disk D by a second rotation drive mechanism composed of a motor M2 and a rotating member 40 or the like which drives the rotation center position of the disk D to rotate. The direction X of the direction or orientation of the crystal axis of the optical modulation material PML in the disk D and the direction PLF of the polarization plane of the laser light P1 are shown in FIGS. 2, 3, 4 (a) to 4 (c). As can be seen from the figure, the recording and reproducing operation is performed in a state of maintaining a substantially constant relationship.

In the apparatus of the embodiment of the present invention shown in FIG. 1, in the case where the record is sequentially made at a predetermined record interval (track pitch) in the radial direction of the disk D, the irradiation position of the laser light is continuous in the radial direction of the disk D. (When forming a recording record in the spiral winding) or concise (when forming a concentric recording record), the laser beam in the above-described disk D in the embodiment device of the present invention shown in FIG. Since the irradiation position of P1 and the rotation center (the center of the rotation shaft 42 of the motor M2) in the second rotation drive mechanism must always coincide with each other, it is provided in the rotation member 40 that rotates the rotation drive by the motor M2 as described above. The feed table 38 engaged with the reel (not shown) is rotated by the feeding screw 39 by a simple or continuous rotation in the predetermined state of the motor M3. By simply or continuously moving in the direction of the arrow v in FIG. 1, the irradiation position of the laser light P1 on the disk D always coincides with the rotation center (center of the rotation shaft 42 of the motor M2) in the second rotation drive mechanism. It is in a state of doing.

Next, FIGS. 6 and 7 show a disk D composed of an optical modulator member and a charge support layer having optical anisotropy in an orientation or the like, the circumference of which the orientation direction of the optical modulator member being used as its constituent member is in the disk D. FIG. In order to perform recording and reproducing by using an optical modulator member disposed throughout the disk D so as to be in a direction or a radial direction so as to keep the polarization plane of the laser light and the alignment direction in the optical modulator member of the disk D in a substantially constant relationship. Fig. 1 shows a schematic structure of a recording / reproducing apparatus of the present invention.

First, FIG. 6 shows a light modulating member (e.g., liquid crystal) member having optical anisotropy in the orientation used as one of the constituent members of the disk D. In this embodiment, the recording and reproducing is performed by using the disk D configured as described above, and the orientation PLF of the flat surface of the laser light P1 and the optical modulator member of the disk D are kept in almost constant relation. The plurality of lines shown in the radial direction of the disk D in FIG. 6 are for indicating that the orientation direction X of the optical modulator member of the disk D coincides with the radial direction of the disk D. FIG.

Next, FIG. 7 shows a light modulating member (liquid crystal) member having optical anisotropy in the orientation used as one of the constituent members of the disk D such that its orientation direction is the main direction of the disk D over the entire surface of the disk D. The recording and reproducing is performed by using the disk D, and the direction PLF of the polarization plane of the laser light P1 and the orientation direction X of the optical modulator member of the disk D are maintained in a constant relationship, respectively. The plurality of lines shown in the main direction in D are for indicating that the orientation direction X of the optical modulator member of the disc D coincides with the main direction of the disc D. FIG.

8 shows an optical modulator member having optical anisotropy in a crystal axis or orientation used as one of the constituent members of the disk D, and the recording / reproducing regions Z1 and Z2 so that the crystal axis direction and the orientation direction thereof become the radial direction of the disk D. … Recording and reproducing is performed using the disk D constituted in the circumferential direction of the disk D, and the direction PLF of the polarization plane of the laser light P1 and the respective recording and reproducing areas Z1, Z2... This is an embodiment in which the crystal axis direction and the orientation direction X of the optical modulator are maintained in a substantially constant relationship.

11 shows rotation of the polarization plane of the laser light in response to the rotation of the disc D, whereby the direction of the polarization plane of the laser light and the direction or orientation of the crystal axis of the optical modulator member of the disc D are maintained in a substantially constant relationship. In FIG. 11, LS1 and LS2 are laser light sources emitting linearly polarized laser light, PMOD1 to PMOD4 are light modulators, PD is a light detector, 48 and 49 are polarizers, 50 is a rotating polarizer, 44 47 to 47 are input terminals of the modulation signals to the above-described modulators PMOD1 to PMOD4.

In the recording and reproducing apparatus of FIG. 11, the linearly polarized laser light PL _1a emitted from the laser light source LS1 is _shown in FIG. 13 (a) supplied by the optical modulator PMOD1 and the polarizer 48 to the input terminal 44 of the optical modulator PMO1. Laser light p1 _{1b, which} is intensity modulated by the illustrated signal and exhibits a change in intensity on the time axis as shown in FIG. 13 (a), is incident on the light modulator PMOD4.

The laser light p1 _1b incident on the optical modulator PHOD4 is outputted out of phase by π during a period when a signal having the half wavelength voltage Vπ of FIG. 13 (d) is supplied to the input terminal 47 of the optical modulator PMOD4. The linearly polarized laser light PL _2a emitted from the laser light source LS2 is a signal as shown in FIG. 13 (b) supplied by the optical modulator PMOD2 and the polarizer 49 to the input terminal 45 of the optical modulator PMOD2. The laser light p1 _2b is intensity-modulated by the laser beam and shows the change in intensity on the time axis as shown in FIG. 13 (b).

The laser light p1 _2b incident on the optical modulator PMOD3 is output out of phase by π during a period in which a signal having a half wavelength voltage Vπ of FIG. 13 (c) is supplied to the input terminal 46 of the optical modulator PMOD3.

And in which the above-described optical modulator synthesized by PMOD4 laser light p1 ₁ and the above-described optical modulator PMOD3 laser light p1 ₂ the ice splitter pbs ₂ emitted from the exit after transmitted through the beam splitter pbs ₂ but incident on the disc D, the The laser light incident on the disk D causes the polarization plane to rotate in synchronization with the rotation of the disk D, and therefore can be rotated in synchronization with the rotation of the disk D of the laser light incident on the rotating disk D.

The state of light shown in the left axis of FIGS. 12 (a) to 12 (f), respectively, is the state of the light at each time point shown as the view of FIGS. 13 (a) to 13 (f) in the horizontal axis of FIG. And the polarization planes of the laser light irradiated onto the disc D are rotated on the time axis in synchronism with the rotation of the disc D, as in the vector shown to the right of Figs. 12 (a) to (f). In the embodiment of FIG. 11, the polarization plane of the laser light is rotated in synchronization with the rotation of the disc so that the laser light can maintain the polarization plane direction and the crystal axis direction or orientation direction X of the optical modulator of the disc D in a constant relationship.

Therefore, when the laser light projected on the above-mentioned disk D in the beam splitter pbs ₂ is made to be intensity-modulated by the information signal to be recorded, the information signal to be recorded on the disk D is well recorded in electric charge.

In addition, in FIG. 11, the illustration of the optical system composed of the lens and other lenses used in the configuration of the recording / reproducing system is omitted in order to avoid the confusion of the illustration (this is described with reference to FIGS. 6 to 8 described later). The same is true).

Reading on the charge of the recorded disc can be carried out to ensure the constant intensity laser light perspective with respect to the disc D above in the beam spill liter pbs _2, light reflected by the disk D is reflected by the beam splitter pbs ₂ rotating polarizer As provided to 50, the photodetector PD in the rotating polarizer 50 is supplied with light indicating a change in light intensity in response to the information signal recorded on the disk D, and the photodetector PD is provided with an information signal recorded on the disk D. A time series signal corresponding to is outputted.

Next, the recording and reproducing apparatus shown in FIG. 17 emits linearly polarized laser light p1, and rotates the rotating light polarizer 50 provided in the optical path of the laser light source LS and the disk D and the photodetector PD. By rotating in synchronism, the polarization plane direction of the laser light and the crystal axis direction or orientation direction X of the optical modulator of the disk D are maintained in a constant relationship. In FIG. 17, pbs is a beam splitter.

In addition, the recording and reproducing apparatus shown in FIG. 18 is provided in the optical polarizer 51 of the rotating polarizer 51 in which the linearly polarized laser light p1 emitted from the laser light source LS is passed through the wave plate WP, and the disk D and the optical detector PD. By rotating the rotating polarizer 50 in synchronism with the rotation of the disk D, the polarizing plane direction of the laser light and the crystal axis direction or orientation direction X of the optical modulator of the disk D are maintained in a constant relationship. In FIG. 18, pbs is a beam splitter.

As described in detail above, the recording and reproducing apparatus of the present invention has a charge corresponding to an information signal to be recorded using laser light on a disk of a rotating recording medium composed of an optical modulator member and a charge support layer having optical anisotropy in a crystal axis or orientation. A recording and reproducing apparatus which forms a pattern and enables reading of a charge pattern formed on a rotating recording medium disc using a laser light, comprising: a first rotating drive mechanism for driving and rotating a rotating recording medium disc at predetermined angular speeds; The rotation center position of the rotating recording medium described above in the direction opposite to the rotational angle of the rotating recording medium disk, which is the same as the rotation angle of the rotating recording medium disk, with the position of the laser light incident on the rotating recording medium disk as the rotation center. And a second rotation drive mechanism to drive and rotate the laser beam. And a recording / reproducing apparatus configured to maintain the crystal axis direction and the orientation direction of the optical modulator member of the polarizing plane and the disk of the rotating recording medium in a substantially constant relationship, an optical modulator member having optical anisotropy in the crystal axis or orientation, and the charge support layer. A recording and reproducing apparatus in which, on a disk of a rotating recording medium, a charge pattern corresponding to an information signal to be recorded using laser light is read, and a charge pattern formed on the disk of a rotating recording medium is read using a laser light. The optical modulator member is disposed so that the orientation direction of the optical modulator member used as the constituent member of the disk is in the circumferential direction or the radial direction of the disk of the rotating recording medium, Recording and reproducing apparatus for maintaining the orientation direction in a substantially constant relationship And a charge pattern corresponding to the information signal to be recorded using laser light on a disk of a rotating recording medium composed of an optical modulator member having optical anisotropy and a charge support layer in a crystal axis or orientation direction, and using laser light. A recording and reproducing apparatus configured to read out the above-mentioned charge pattern formed on a rotating recording medium disk, wherein a crystal axis and an orientation direction of an optical modulator member used as a constituent member of the rotating recording medium disk are opposite to the radial direction of the rotating recording medium disk. A plurality of recording and reproducing regions, which are arranged in substantially the same direction in a predetermined direction, are provided on the rotating recording medium disc to determine the crystal axis direction and the orientation direction of the optical modulation material member of the above-described plurality of recording and reproducing areas on the polarization plane of the laser light and the rotating recording medium disc. Recording and reproducing apparatus for maintaining And forming a charge pattern corresponding to an information signal to be recorded using laser light on a disk of a rotating recording medium composed of an optical modulator member having an optical anisotropy and crystal charge or an optical anisotropy in a crystal axis or orientation, and rotating recording using laser light. A recording and reproducing apparatus configured to read a charge pattern on a disk, wherein the polarization plane of the laser light is rotated in response to the rotation of the disk of the rotating recording medium, so that the crystal axis direction of the polarization plane of the laser beam and the optical modulator member of the disk of the rotation recording medium is rotated. In the recording / reproducing apparatus of the present invention, the recording / reproducing apparatus of the present invention includes an optical modulator member and a charge support layer having optical anisotropy in crystal axes, orientations, or the like as a recording medium used in the conventional recording / reproducing apparatus. Is configured when In the case where the recording medium is composed of a rotating recording medium disk, the polarization plane direction of the laser light for recording and reproducing, and the crystal axis direction of the optical modulating member member having optical anisotropy in the crystal axis or orientation used for a part of the constituent members of the rotating recording medium disk. The relationship between the orientation direction and the orientation direction is changed by the rotation of the disk of the rotating recording medium, so that the recording and reproduction can be performed satisfactorily, and the crystal axis direction and the orientation of the optical modulator member of the laser recording disk and the direction of the optical modulation material member in the disk of the rotating recording medium are maintained in a substantially constant relationship. According to the present invention, the conventional problems described above can be satisfactorily solved.

Claims (4)

Corresponding to the information signal to be recorded by using the laser light P1 on the rotating recording medium disk D composed of the member PML composed of the optical modulating material having optical anisotropy in crystal axis or orientation and the charge support layer 34. A recording and reproducing apparatus for forming a charge pattern and reading the charge pattern formed on the rotating recording medium disk D using the laser light P1, wherein the rotating recording medium disk D is provided at predetermined angular speeds. The rotational recording medium disk (described above) is used as the rotational center of the first rotation driving mechanism 35 (M ₁ , TT) for driving the rotation of the laser beam and the position of the laser light P1 incident on the rotating recording medium disk D. Second rotation drive mechanisms 40 and M ₂ for driving rotation of the rotation center position of the rotation recording medium D in the same manner as the rotational angular speed of D) and in a direction opposite to the rotation direction of the rotation recording medium disc D. With) And the crystal axis direction or the orientation direction of the member PML composed of the polarization plane of the laser light P1 and the optical modulator of the rotating recording medium disk D in a substantially constant relationship. . 2. The method according to claim 1, wherein the orientation direction of the member PML composed of the optical modulator used as the constituent member of the rotating recording medium disk D is the circumferential direction or the radial direction of the rotating recording medium disk D. And arranging the member (PML) to maintain the orientation of the polarization plane of the laser light (P) and the member (PML) of the rotating recording medium disc (D) in a substantially constant relationship. A plurality of recordings as claimed in claim 1, wherein the crystal axis and orientation direction of the member PML, which is used as a constituent member of the rotating recording medium D, is in a direction substantially the same as the radial direction of the rotating recording medium disc D. By arranging a reproduction area on the rotating recording medium disc D, the crystal axis direction of the members PML in the polarization plane of the laser light P and the plurality of recording reproduction areas on the rotating recording medium disc D, or A recording and reproducing apparatus, wherein the orientation direction is maintained in a substantially constant relationship. The optical modulator of claim 1, wherein the polarization plane of the laser light P1 and the polarization plane of the laser light P1 are rotated by rotating the polarization plane of the laser light P1 corresponding to the rotation of the rotation recording medium disc D. And the crystal axis direction or the orientation direction of the member PML composed of the plurality of members.

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