JP2010061738A - Apparatus and method for hologram reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin and compact hologram reproduction apparatus. <P>SOLUTION: A hologram reproduction apparatus 1 includes: a pickup unit 110 having a laser light source unit as a light source of reference light, and an imaging unit, and arranged on one surface of a hologram medium 70; a medium stage 120 as a holding unit for holding the hologram medium 70; and a mirror 101 disposed on the other surface of the hologram medium 70, for reflecting the reference light transmitted through the hologram medium 70, so as to make it incident on the hologram medium 70. The pickup unit 110 is movable to a pickup unit drive direction 501, which is one direction parallel to the surface of the hologram medium 70. The mirror 101 is extended to the pickup unit drive direction 501. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hologram reproducing device and a hologram reproducing method.

  Research and development of a hologram recording / reproducing apparatus that records or reproduces data using holography is ongoing. In the hologram recording / reproducing apparatus, two lights of modulated “signal light” and unmodulated “reference light” are generated from the laser light, and these are irradiated toward the same place of the hologram medium. As a result, the signal light and the reference light interfere on the hologram medium, and a diffraction grating (hologram) is formed at the irradiation point. As a result, data is recorded on the hologram medium. In the hologram recording apparatus, by recording data while changing the incident angle of the reference light to the hologram medium, a plurality of data can be recorded in the same area of the hologram medium. This is also referred to as “angle multiplexing recording method”. By performing multiple recording in this way, it is possible to increase the recording capacity. When reading the recorded data, the reference light is incident on the diffraction grating formed on the hologram medium. By doing so, diffracted light is generated from the diffraction grating. This diffracted light is also referred to as “reproduced light”. Information recorded on the hologram medium can be read by detecting the reproduction light with an image sensor.

  In the hologram recording / reproducing apparatus of the angle multiplex recording system, a plurality of data recorded in the same area of the hologram medium can be read by changing the incident angle of the reference light. As means for changing the angle of incidence of the reference light on the hologram medium, a mirror such as a galvano mirror, to which a rotation shaft is attached and the rotation angle can be controlled, is used.

  An example of a method for reproducing data recorded by the angle multiplex recording method is described in Japanese Patent Laid-Open No. 2006-235364 (Patent Document 1).

In the configuration shown in FIG. 6C of Patent Document 1, a reflective film as a mirror is arranged on the lower side of the recording medium so as to be separated from the recording medium, and the reference light irradiated from the light source is Reflected by a reflective film provided on the opposite side across the recording medium, and the reflected light is incident on the recording area, diffracted light as reproduction light is generated. Since this reproduction light is emitted toward the side where the light source is arranged, not the side where the reflection film is arranged as viewed from the recording medium, the reproduction light is emitted by the photodetector provided on the side where the light source is arranged. Is received and an information reproduction signal is obtained.
JP 2006-235364 A

  Patent Document 1 does not describe a specific configuration for realizing a hologram recording / reproducing apparatus. In FIG. 8 of Patent Document 1, a light source and a reflection mirror arranged so as to sandwich a recording medium are shown, but a specific configuration for arranging in such a positional relationship is described in Patent Document 1. Absent. In order to reproduce the data recorded by the hologram method, the relative positional relationship between the recording medium, the light source, and the reflection mirror needs to be accurately managed. In addition, there is a problem that the apparatus becomes large because a reflection mirror is used and a mirror driving mechanism is connected to the entire reflection mirror.

  Therefore, an object of the present invention is to provide a hologram reproducing apparatus that is thin and small. Furthermore, an object of the present invention is to provide a hologram reproducing method that can make a necessary apparatus thin and small.

  The “hologram reproduction device” is not limited to a so-called reproduction-only device that exclusively reproduces data recorded by the hologram method, and may be a recording / reproduction device that can perform both recording and reproduction.

  In order to achieve the above object, a hologram reproducing apparatus according to the present invention comprises a pickup unit that holds a laser light source unit that is a light source of reference light and an imaging unit and is arranged on one surface side of the hologram medium, and the hologram medium. And a mirror that is disposed on the other surface side of the hologram medium and reflects the reference light that has passed through the hologram medium so as to be incident on the hologram medium. It can move in the pickup unit driving direction which is one direction parallel to the surface of the hologram medium, and the mirror extends in the pickup unit driving direction.

  According to the present invention, the hologram reproducing apparatus can be made thin and small.

(Embodiment 1)
(Constitution)
With reference to FIGS. 1-6, the hologram reproducing apparatus in Embodiment 1 based on this invention is demonstrated. The hologram reproducing device 1 holds a laser light source device 80 (see FIG. 6) as a laser light source unit that is a light source of reference light and an imaging device 90 (see FIG. 6) as an imaging unit. The pickup unit 110 arranged on the surface side, the medium stage 120 (see FIG. 1) as a holding unit for holding the hologram medium 70, and arranged on the other surface side of the hologram medium 70 and transmitted through the hologram medium 70. And a mirror 101 that reflects the reference light and enters the hologram medium 70. The pickup unit 110 can move in a pickup unit driving direction 501 that is one direction parallel to the surface of the hologram medium 70, and the mirror 101 extends in the pickup unit driving direction 501.

  As shown in FIG. 1, the hologram reproducing apparatus 1 can read information multiplexed and recorded on the hologram medium 70 by controlling the incident angle of the reference light with respect to the hologram medium 70 by the rotation control mirror apparatus 100. It is the apparatus comprised as follows. Although the hologram medium 70 itself does not form a part of the hologram reproducing apparatus 1, for the convenience of explanation, the hologram medium 70 is also displayed including the hologram medium 70 in FIG. The same applies to the following drawings.

  As shown in FIGS. 1 and 3, the rotation control mirror device 100 includes a mirror 101. As shown in FIGS. 1 and 3, the medium stage 120 is for holding and moving the hologram medium 70. The pickup unit 110 is for reading information recorded on the hologram medium 70.

  As shown in FIG. 2, a large number of data recording locations 401 exist so as to develop along the surface of the hologram medium 70, that is, in the in-plane direction. In order to select a data recording location to be reproduced from among these many data recording locations 401, the hologram medium 70 and the pickup unit 110 are relatively moved in parallel with the surface of the hologram medium 70. As shown in FIG. 1, the medium stage 2 can be translated by two guide shafts 5 and 6 arranged in parallel to each other. The pickup unit 110 can be translated by two guide shafts 3 and 4 arranged in parallel to each other.

  FIG. 3 is a diagram showing a schematic configuration of the hologram reproducing device 1 as viewed from the direction of the central axis of the guide shafts 5 and 6. The pickup unit 110 includes a bearing 115 into which the guide shafts 3 and 4 are inserted. The pickup unit 110 is moved in the left-right direction in FIG. 3 along the guide shafts 3 and 4 by a driving device (not shown). The guide shafts 3 and 4 are fixed to the housing 2, and the guide shafts 3 and 4 are parallel to the surface of the hologram medium 70. Therefore, the pickup unit 110 is driven along a certain direction parallel to the surface of the hologram medium 70. As a result, the pickup unit 110 can be positioned at any position between the sections 410.

  FIG. 4 is a diagram showing a schematic configuration of the hologram reproducing apparatus 1 as viewed from the direction of the central axis of the guide shafts 3 and 4. The medium stage 120 holding the hologram medium 70 includes a bearing 125 into which the guide shafts 5 and 6 are inserted. The medium stage 120 is moved in the left-right direction in FIG. 4 along the guide shafts 5 and 6 by a driving device (not shown). The guide shafts 5 and 6 are fixed to the housing 2 so as to be parallel to the surface of the hologram medium 70 and to be perpendicular to the moving direction of the pickup unit 110. Accordingly, the hologram medium 70 is driven in a direction perpendicular to the moving direction of the pickup unit 110, that is, the pickup unit driving direction 501. As a result, the pickup unit 110 can be positioned at any position between the sections 420.

  With such a configuration, the hologram medium 70 and the pickup unit 110 are relatively driven so as to be parallel to the recording surface of the hologram medium 70.

  FIG. 5 is a diagram illustrating how the pickup unit 110 and the medium stage 120 are driven. The pickup unit 110 and the medium stage 120 are independently driven and relatively positioned to reproduce from a large number of data recording locations arranged in an array in the in-plane direction on the hologram medium 70. The data recording location can be selected and the recorded data can be read.

(Action / Effect)
According to the hologram reproducing apparatus in the present embodiment, the entire apparatus can be made thin and small.

(How to read multiple recorded data)
Next, with reference to FIGS. 6 to 9, a method for reading the data recorded in multiple recording at a single data recording location will be described.

  FIG. 6 is a diagram illustrating a schematic configuration of the mirror 101, the pickup unit 110, and the hologram medium 70. The hologram medium 70 includes a hologram recording layer 71 that is a photosensitive material and is a layer on which data is recorded. The hologram recording layer 71 is sandwiched between the base material 72a and the base material 72b.

  When reading data from the hologram medium 70, as shown in FIG. 6, the mirror 101 is disposed on the substrate 72a side of the hologram medium 70, and the pickup unit 110 is the opposite substrate 72b. Placed on the side.

  As shown in FIG. 6, the pickup unit 110 includes a laser light source device 80, an imaging device 90, and a pickup housing 111. The laser light source device 80 includes a laser diode 81, a mirror 84, a collimating lens 82, and a collimating lens holder 83 that holds the collimating lens 82.

  The laser diode 81 emits laser light PA. The optical path of the laser beam PA is bent by the mirror 84 and enters the collimating lens 82. The bending of the optical path in this way contributes to thinning of the device. The collimating lens 82 makes the laser beam PA emitted from the laser diode 81 parallel light. This parallel light is the reference light R1. The arrangement order of the mirror 84 and the collimating lens 82 may be reversed so that the mirror 84 bends the optical path of the reference light R1.

  The reference light R1 generated from the laser light PA emitted from the laser light source device 80 is incident on the inside of the hologram medium 70 from the base material 72b and is emitted from the base material 72a. In this way, the reference light R1 passes through the hologram medium 70, but the incident angle of the reference light R1 at this time does not satisfy the condition for reproducing data. Does not occur. The reference light R1 emitted from the base material 72a is reflected by the mirror 101 and travels again to the hologram medium 70 as the reference light R2. The reference light R2 at this time is applied to the hologram medium 70 at an incident angle that satisfies the condition for reproducing data. By irradiating the hologram medium 70 on which data has been recorded with the reference light R2, diffracted light, that is, reproduction light is generated from the diffraction grating formed on the hologram recording layer 71 sandwiched between the base material 72a and the base material 72b. Since the reproduction light includes data superimposed on the signal light at the time of recording, the recorded data can be obtained by receiving the light with the imaging device 90.

  As shown in FIG. 6, the imaging device 90 includes an imaging element 91 for receiving reproduction light, an objective lens 92 for forming an image of the reproduction light on the imaging surface of the imaging element 91, and an objective that holds the objective lens. A lens holder 93 and a diaphragm 94 for removing unnecessary light are included. As the image sensor 91, for example, a charge-coupled device (CCD) area sensor can be used, and a CMOS sensor using a complementary metal-oxide-semiconductor (CMOS) can also be used. The two-dimensional pattern information is reproduced based on the signal detected by the image sensor 91, and the data recorded on the hologram medium 70 is read.

  FIG. 7 is a schematic diagram showing a state in which multiplexed data is read. By changing the angle of the mirror 101 around the rotation axis 2 b by the rotation control mirror device 100, the incident angle of the reference light R 2 with respect to the hologram medium 70 is changed, and a plurality of data recorded in a multiplexed manner in the same area of the hologram medium 70 A desired one can be selected and read.

  8 and 9 are diagrams schematically showing the rotation control mirror device 100. FIG. As shown in FIG. 8, the rectangular mirror 101 is fixed to the middle part of the mirror holder 102. Rotating shafts 102a and 102b are formed on both ends of the mirror holder 102 so as to be coaxial with each other. As shown in FIG. 9, the axis 102x which is the central axis of the rotating shafts 102a and 102b and the longitudinal axis of the mirror 101 are formed. It is parallel to the direction.

(Mechanism for rotating the mirror)
As shown in FIG. 9, the hologram reproducing apparatus according to the present embodiment includes rotating shafts 102 a and 102 b that rotate the mirror 101, a worm wheel 105 attached to the rotating shaft 102 b, and a worm gear that fits the worm wheel 105. 107 and a motor 106 for rotating the worm gear 107, and the motor 106 is preferably disposed on the hologram medium 70 side with respect to the rotation shafts 102a and 102b.

  The rotating shafts 102a and 102b are rotatably supported by bearings 103 and 104 fixed to the housing 2, respectively. A worm wheel 105 is attached to the rotating shaft 102 b of the mirror holder 102. As shown in FIGS. 8 and 10, the worm gear 107 that meshes with the gear portion of the worm wheel 105 is directly connected to the output shaft of the motor 106 fixed to the housing 2. By rotating the mirror holder 102 by the motor 106, the mirror 101 is rotated around the axis line 102x, and the incident angle of the reference light R2 is controlled. The motor 106 is arranged closer to the hologram medium 70 than the rotating shafts 102a and 102b, and the drive of the motor 106 is transmitted by the worm wheel 105, thereby reducing the thickness of the entire apparatus.

  As shown in FIG. 1, in the hologram reproducing apparatus according to the present embodiment, it is preferable that the mirror is rotatable, and the center axis of rotation of the mirror is parallel to the driving direction of the pickup unit. As shown in FIG. 9, the axis line 102x, which is the central axis of the rotating shafts 102a and 102b, is parallel to the guide shafts 3 and 4, and as shown in FIG. 3, the longitudinal direction of the mirror 101 and the pickup unit driving direction 501 Are parallel. Since the longitudinal direction of the mirror 101 and the pickup unit driving direction 501 are parallel, even if the pickup unit 110 stops at an arbitrary position in the section 410, the reference light R1 is reflected by the mirror 101 as shown in FIG. Then, it can be made incident on the hologram medium 70 as the reference light R2. With such a configuration, the weight of the pickup unit 110 can be reduced, and driving with a smaller motor becomes possible.

  In the hologram reproducing device according to the present embodiment, a connection member for bypassing the hologram medium 70 to connect the pickup unit 110 and the rotation control mirror device 100 is unnecessary, so that a space for operating the connection member is provided. It is unnecessary.

Since the bearing is extended in the longitudinal direction for the mirror 101, it is easy to correct the positional relationship between the mirror 101 and the pickup unit 110 by adjusting the position between the bearings 103 and 104. When the distance between the bearing 103 and the bearing 104 is L, and the positioning accuracy of each bearing is Δd, the angle adjustment resolution Δθ of the mirror 101 is
Δθ ≒ tan ^-1 (Δd / L)
It is. Therefore, the larger L is, the more accurate adjustment can be made. In this embodiment, the mirror 101 is not mounted on the pickup unit 110, but the positional accuracy between the mirror 101 and the pickup unit 110 can be improved.

  Since the rotation axis of the mirror 101 is parallel to the movement direction of the pickup unit 110, that is, the pickup unit driving direction 501, the irradiation angle is selected only by the rotation control mirror 110, and the movement of the hologram medium 70 in the in-plane direction is performed. 110 and media stage 120 only. Therefore, in the present embodiment, the structure responsible for positioning the hologram medium 70 in the in-plane direction is separated from the structure responsible for positioning the mirror angle, so that control is simplified.

  The hologram reproducing apparatus 1 according to the present embodiment includes guide shafts 3 and 4 as slide shafts for moving the pickup unit 110 in the pickup unit driving direction 501, rotation shafts 102a and 102b for rotating the mirror 101, and a rotation shaft. It is preferable that bearings 103 and 104 for holding 102a and 102b are provided, and the slide shaft and the bearings 103 and 104 are respectively fixed to the same member.

  As shown in FIG. 3, in the hologram reproducing device in the present embodiment, bearings 103 and 104 that support the rotation shaft of rotation control mirror device 100 and guide shafts 3 and 4 that support pickup unit 110 are both included. The housing 2 is supported and fixed. That is, since the rotation control mirror device 100 and the pickup unit 110 are respectively supported by guide members fixed to the casing 2 as the same member, positioning is performed when the hologram reproducing device is assembled. High accuracy can be assembled. Therefore, even if the rotation control mirror device 100 and the pickup unit 110 are independent members, the positional accuracy of each other can be increased and a good reproduced image can be obtained.

  The pickup unit 110 is disposed on the opposite side of the rotation control mirror device 100 with the hologram medium 70 interposed therebetween. The laser light emitted from the laser light source device 80 once passes through the hologram medium 70, enters the mirror 110, and is reflected toward the hologram medium 70. By adopting this configuration, the laser light source 80 and the imaging device 90 can be disposed close to each other in the same pickup housing 111, so that the entire device can be reduced in size and thickness.

  In hologram reproducing apparatus 1 in the present embodiment, medium stage 120 as the holding unit is preferably driven in a direction perpendicular to pickup unit driving direction 501.

  The hologram medium 70 is driven in a direction perpendicular to the pickup unit 110, in the surface direction of the hologram medium 70, that is, in a so-called “in-plane” manner. This driving is performed independently of the pickup unit 110. The hologram medium 70 is mounted on a medium stage 120 that is driven in a direction independent of the pickup unit 110, and the hologram medium 70 is moved in the plane by the pickup unit 110 and the medium stage 120. The motor can be downsized and the entire stage can be downsized as compared with the case where it is mounted on a two-axis drive type stage and moved in the plane. In the description so far, the description has been made on the assumption that the hologram medium 70 is rectangular. However, a rectangular medium is preferable because it is easy to handle. However, in the case of “rectangular”, a shape that can be regarded as a substantially rectangular shape is included in addition to a strict rectangular shape. As will be described later, the hologram medium may have a shape other than a rectangle.

(Hologram medium loading method)
The medium stage 120 as the holding unit can drive the hologram medium 70 in a certain direction, and the direction in which the hologram medium 70 is attached to and detached from the holding unit is preferably the direction in which the hologram medium 70 is driven.

  With reference to FIG. 11, a loading method of hologram medium 70 in hologram reproducing apparatus 1 in the present embodiment will be described. The front side of the medium stage 120 is open so that the hologram medium 70 can be inserted. The “front side” here is the side indicated by the arrow 510. Inside the housing 2 of the hologram reproducing apparatus 1, the guide shaft 4 is on the front side and the guide shaft 3 is on the rear side. The housing 2 is provided with an opening (not shown) on the front side for taking in and out the hologram medium 70. Since the direction in which the hologram medium 70 is put in and out matches the driving direction of the medium stage 120, the medium stage 120 is moved to a position close to the front end of the housing 2 in advance when the hologram medium 70 is loaded. Then, the hologram medium 70 is inserted through the opening of the housing 2. At this time, the hologram medium 70 is inserted along the same direction as the medium stage driving direction 502. The hologram medium 70 is inserted from the front side with respect to the medium stage 120 and is held by the medium stage 120. Thus, loading is completed.

  By performing such a loading method, the drive mechanism of the medium stage 120 can be used as the loading mechanism. Therefore, the mechanism of the entire apparatus can be simplified.

(Embodiment 2)
With reference to FIG. 12, the hologram reproducing method in Embodiment 2 based on this invention is demonstrated.

  The hologram reproducing method in the present embodiment includes first to third steps as shown in FIG. That is, this hologram reproducing method is for holding the hologram medium 70 and the mirror 101 that can rotate around the axis line 102x as a central axis parallel to the pickup unit driving direction 501 and extend in the pickup unit driving direction 501. With respect to the hologram reproducing apparatus 1 including the medium stage 120 as a holding unit, the hologram medium starts to be inserted toward the inside of the holding unit along a direction perpendicular to the pickup unit driving direction 501. The first step of stopping the insertion of the hologram medium at a position for reproducing the recorded content of the first row of the first row, and the first row of the first row of the hologram medium as the start point and the other as the end point, the start point A second step of reproducing the recorded content by moving the pickup unit from the position toward the end point, and the pickup After reaching the end point, the hologram medium is moved from the position where the recorded area of the first row of the hologram medium is reproduced to the position where the recorded contents of the second row as the next area are reproduced. A third step of moving.

(First step)
First, the first step will be described in detail. As shown in FIG. 6, there is a space above the area of the pickup unit 110 where the laser light source device 80 on the front side is provided. This is because the rotation control mirror device 100 has a small projected area on a plane perpendicular to the pickup unit driving direction. Therefore, in the first step, the hologram medium 70 can be easily inserted by receiving the hologram medium 70 in the space as shown in FIG.

  In addition, since there is a space, it is easy to design a holding unit for holding the hologram medium 70, that is, the degree of freedom in designing the medium stage 120 is increased. Therefore, the medium stage 120 can be designed to be thick. As a result, it is possible to prevent reproduction light from being obtained accurately due to deflection or vibration. In addition, when the hologram medium 70 is repeatedly attached to and detached from the holding unit, a mechanism for increasing the positioning accuracy of the hologram medium 70 with respect to the holding unit can be attached.

Therefore, stable hologram reproduction can be realized.
In general, when reproducing data recorded by the hologram method, desired reproduction light cannot be obtained unless the same state as that at the time of recording is realized. In the hologram reproducing apparatus according to the present invention, the pickup unit 110 and the mirror 101 necessary for reproduction are configured with high positional accuracy. However, if the holding accuracy of the holding part of the hologram medium is poor, data cannot be reproduced normally. Thus, as in the hologram reproducing method of the present invention, the hologram type data reproduction can be ensured by inserting the hologram medium from the side where the area can be secured. Further, when the hologram reproducing method according to the present embodiment is employed, a thin and small hologram reproducing apparatus can be obtained.

(Second step)
Next, the second step will be described in detail. The second step is a step of reading one column of data by moving the pickup unit. In order to perform this process smoothly, it is preferable to determine the initial position of the inserted hologram medium. The reproduction start time can be shortened by setting the pickup unit 110 in order to start reproduction from one of the end portions of the inserted hologram medium.

(Third step)
Next, the third step will be described in detail. In the third step, after the pickup unit reaches the end point, the recorded content of the second row, which is the next region, is reproduced from the position where the recorded region of the first row of the hologram medium is reproduced. A step of moving the hologram medium to a position; In other words, after the scanning of the first column by the pickup unit is finished, the pickup unit is operated to shift the hologram medium to the next column. In this way, data can be reproduced in a very short time.

(Action / Effect)
By performing the hologram reproducing method in the present embodiment, a necessary apparatus can be made thin and small.

  As shown in FIG. 13, after the reproduction light is read and reproduced sequentially from the start point 405 to the end point 406 in the first row L1, in the next second row L2, the start point from the end point 406 of the first row L1 is the same. It is preferable to read in the direction toward 405 and reproduce sequentially. That is, in the second row L2, it is preferable to read in the direction from the data recording location 407 to the data recording location 408. Further, in the next third column L3, reading is performed again in the same direction as in the first column L1. If reading is performed so as to meander in this manner, useless travel time can be eliminated, and a large amount of data can be reproduced in a shorter time.

(Embodiment 3)
(Constitution)
With reference to FIGS. 14 and 15, a hologram reproducing apparatus according to Embodiment 3 based on the present invention will be described.

  In the hologram reproducing apparatus 1h of the present embodiment, the same configuration as that of the hologram reproducing apparatus 1 of the first embodiment is denoted by the same reference numerals as those used in the first embodiment, and description thereof will not be repeated.

  In the embodiments so far, the description has been made on the assumption that the hologram medium has a rectangular shape. However, the hologram medium has a disk shape, and the hologram medium is driven to rotate around a perpendicular passing through the center thereof. It may be a thing. In the present embodiment, a case where the hologram medium has a disk shape will be described.

  Hologram medium 130 used in hologram reproducing apparatus 1h in the present embodiment has a disk shape. In the hologram medium 130, as shown in FIG. 15, data is recorded so as to be aligned in the radial direction D1 and the circumferential direction D2. This hologram reproducing device 1 h includes a rotation mechanism 131 that can support the central portion of the hologram medium 130. The rotation mechanism 131 is for rotating and positioning the hologram medium 130.

  In the present embodiment, the pickup unit 110h moves along the guide shafts 3 and 4 to perform positioning in the radial direction, and performs positioning in the circumferential direction according to the rotation angle of the hologram medium 130, so that desired data recording is performed. A location is selected, and the data recorded in the data recording location is read.

(Action / Effect)
If a disc-shaped hologram medium is used as in the hologram reproducing apparatus in the present embodiment, the reading position can be changed by rotating the hologram medium. There is no need to prepare, and the entire apparatus can be reduced in size.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

1 is a perspective view of a hologram reproducing device in Embodiment 1 based on the present invention. It is a conceptual diagram of the hologram medium used with the hologram reproduction apparatus in Embodiment 1 based on this invention. It is the figure seen from the 1st direction of the hologram reproduction apparatus in Embodiment 1 based on this invention. It is the figure seen from the 2nd direction of the hologram reproduction apparatus in Embodiment 1 based on this invention. It is explanatory drawing of operation | movement of the hologram reproduction apparatus in Embodiment 1 based on this invention. It is the figure which showed schematic structures, such as a laser light source device of the hologram reproduction apparatus in Embodiment 1 based on this invention, a mirror, and an imaging device. It is explanatory drawing of a mode that the hologram reproduction apparatus in Embodiment 1 based on this invention reads the multiplex recording data. It is an exploded view of the rotation control mirror apparatus included in the hologram reproducing apparatus in Embodiment 1 based on this invention. It is a side view of the rotation control mirror apparatus contained in the hologram reproduction apparatus in Embodiment 1 based on this invention. It is explanatory drawing of the rotation transmission part of the rotation control mirror apparatus contained in the hologram reproduction apparatus in Embodiment 1 based on this invention. It is explanatory drawing of the loading method of the hologram medium in the hologram reproducing apparatus in this Embodiment. It is a flowchart of the hologram reproduction method in Embodiment 2 based on this invention. It is explanatory drawing of the preferable form of the hologram reproduction method in Embodiment 2 based on this invention. It is a perspective view of the hologram reproduction apparatus in Embodiment 3 based on this invention. It is a conceptual diagram of the hologram medium used with the hologram reproduction apparatus in Embodiment 3 based on this invention.

Explanation of symbols

  1, 1h Hologram reproducing device, 2 housing, 2b rotation axis, 3, 4 guide shaft (of pickup section), 5, 6 guide shaft of 70, 130 hologram medium, 71 hologram recording layer, 72a, 72b base material, 80 laser light source device, 81 laser diode, 82 collimating lens, 83 collimating lens holder, 84 mirror (of laser light source device), 90 imaging device, 91 imaging device, 92 objective lens, 93 objective lens holder, 94 aperture , 100 Rotation control mirror device, 101 Mirror, 102 Mirror holder, 102a, 102b Rotating shaft, 102x axis, 105 Worm wheel, 106 Motor, 110 Pickup unit, 111 Pickup housing, 115 Bearing, 120 Media stage, 12 5 bearing, 401 data recording location, 405 start point, 406 end point, 410, 420 section, 501 pickup unit drive direction, 502 medium stage drive direction, 510 arrow, PA laser light, R1, R2 reference light.

Claims (8)

A pickup unit that holds a laser light source unit that is a light source of reference light and an imaging unit and is arranged on one surface side of the hologram medium;
A holding unit for holding the hologram medium;
A mirror that is disposed on the other surface side of the hologram medium and reflects the reference light transmitted through the hologram medium so as to enter the hologram medium;
The pickup unit is movable in a pickup unit driving direction which is one direction parallel to the surface of the hologram medium,
The hologram reproducing device, wherein the mirror extends in a driving direction of the pickup unit.   The hologram reproducing apparatus according to claim 1, wherein the mirror is rotatable, and a central axis of rotation of the mirror is parallel to the pickup unit driving direction. A slide shaft for moving the pickup unit in the pickup unit driving direction;
A rotating shaft for rotating the mirror;
A bearing for holding the rotating shaft,
The hologram reproducing apparatus according to claim 1, wherein the slide shaft and the bearing are fixed to the same member. A rotating shaft for rotating the mirror;
A worm wheel attached to the rotating shaft;
A worm gear fitted to the worm wheel;
A motor for rotating the worm gear,
The hologram reproducing apparatus according to claim 1, wherein the motor is disposed closer to the hologram medium than the rotation shaft.   The hologram reproducing apparatus according to claim 1, wherein the holding unit is driven in a direction perpendicular to the driving direction of the pickup unit.   The said holding | maintenance part can drive the said hologram medium to a fixed direction, and the direction which attaches / detaches the said hologram medium to the said holding | maintenance part is a direction in which the said hologram medium is driven. Hologram reproducing device. The hologram medium is disk-shaped,
The hologram reproducing apparatus according to claim 1, wherein the hologram medium is rotationally driven around a perpendicular line passing through the center thereof. For a hologram reproducing apparatus comprising a mirror that can rotate around a central axis parallel to the drive direction of the pickup unit and that extends in the drive direction of the pickup unit, and a holding unit for holding a hologram medium, the pickup unit The hologram medium starts to be inserted toward the inside of the holding unit along the direction perpendicular to the driving direction, and the insertion of the hologram medium is stopped at a position for reproducing the recorded contents of the first row of the hologram medium. A first step of
A second step of reproducing the recorded content by moving a pickup unit from the start point to the end point, with one of the first columns of the hologram medium as a start point and the other as an end point;
After the optical pickup unit reaches the end point, from the position where the recorded area of the first row of the hologram medium is reproduced, to the position where the recorded content of the second row as the next area is reproduced, And a third step of moving the hologram medium.

Images