JP3325520B2 - Multiple hologram recording layer selective reading method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for selectively reading a multiplexed hologram recording layer which enables high-speed access to arbitrary information on a large-capacity multiplexed hologram card medium, and a method for selectively reading a multiplexed hologram recording layer used directly in the method. Related to the device.

[0002]

2. Description of the Related Art In recent years, demand for compact, easy-to-carry and large-capacity memories, such as mobile computing, has been rapidly increasing. The simplest card-type medium is a magnetic card with a magnetic stripe attached thereto, but is used only for limited applications due to its extremely small capacity.

As a card type memory having a larger capacity than the magnetic card, for example, there is an IC card type storage medium ε using an IC card as shown in FIG. The IC card type storage medium device ε has a memory element such as a ROM or a flash ROM embedded in an IC card medium 23 and is supported by a card guide 24 provided in the access device. The reading and writing of data are performed by, for example, bringing a reading and writing head 26 provided in the access device into contact with a reading and writing electrode 25 connected to the memory element provided on the IC card medium 23. .

In addition to IC cards, recording using holograms has been devised. Hologram recording has a feature that it is difficult to forge, in addition to a low bit unit price, and has high expectations as a future software distribution medium. In particular, a plane hologram ROM can be mass-produced using a printing technique. In order to further increase the volume recording density, a plane hologram is embedded in an optical waveguide, guided light is used as reference light, and an arbitrary layer can be used. A flat optical waveguide hologram card capable of reproducing a hologram has been proposed (Yagi et al., Japanese Patent Application No. 10-32578).

In this method, a multilayer optical waveguide is formed by alternately laminating a core layer and a cladding layer, and information is recorded in each optical waveguide as a hologram as a scattering factor. For reproducing information, it is possible to obtain only a desired hologram image by coupling incident light to a target optical waveguide. At this time, since a structure in which the reproduction light is not coupled to the other waveguides can be adopted, there is a feature that the crosstalk can be suppressed low.

[0006]

However, although an IC card achieves a larger capacity than a magnetic card, it does not meet the present and future demands of data storage of several hundred megabytes to several gigabytes. However, since the bit cost is high, it is not sufficient as a large-capacity recording medium.

Also, hologram recording realizes recording with low bit cost, but in order to read information recorded in a desired layer from a large number of recording layers, incident light is coupled to a target optical waveguide. Although it is necessary, a method for easily detecting the coupling state between the incident light and the optical waveguide, and a method for easily moving the incident light to the target optical waveguide have not been established. However, miniaturization and cost reduction have been obstacles.

The main objects to be solved by the present invention are as follows.

A first object of the present invention is to provide a method and an apparatus for selectively reading a multiplex hologram recording layer which can easily detect the coupling state between incident light and an optical waveguide.

A second object of the present invention is to provide a method and an apparatus for selectively reading a multiplex hologram recording layer that can easily move incident light to a target optical waveguide.

A third object of the present invention is to provide a method and an apparatus for selectively reading a multiplexed hologram recording layer which can access a desired recording layer at high speed.

A fourth object of the present invention is to provide a method and an apparatus for selectively reading multiple hologram recording layers which can reduce the size and cost of the apparatus.

Another object of the present invention is to provide a specification, drawings,
In particular, it will be obvious from the description of each claim in the claims.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes it possible to move incident light to a laminated planar optical waveguide type hologram element, to image a servo information image, and to detect the intensity of the emitted light. Means for performing the discrimination and counting of the discrimination result, based on the imaging of the servo information image, the discrimination and the position information obtained from the counting of the discrimination result, and moving the incident light to reproduce the hologram of the target recording layer. A method for reading data from an image is provided.

More specifically, to solve the above-mentioned problems, the present invention achieves the above object by adopting new characteristic constitution means or techniques ranging from a superordinate concept to a subordinate concept as listed below. Is done.

That is, a first feature of the method of the present invention is that, when selecting and reading data hologram-recorded on multiple recording layers by the laminated planar optical waveguide type hologram element, the recording layer selected arbitrarily is used. While moving the incident light to the entrance end, the light intensity of the exit light emitted from the exit end is detected,
An object of the present invention is to adopt a configuration of a multiplex hologram recording layer selective reading method in which a target recording layer is specified by a change in the light intensity due to the movement, a reproduction hologram image is captured, and target data is read.

A second feature of the method of the present invention is that, when selecting and reading data recorded on a multiplexed recording layer by a laminated planar optical waveguide hologram element, first, light from a reproduction light source is focused. Incident light is incident on the incident end of the laminated planar optical waveguide hologram element including the arbitrarily selected target recording layer, and then the incident light moves to the uppermost or lowermost recording layer as a position reference. And then
While moving the incident light to the arbitrarily selected target recording layer, the light intensity detected from the light emitted from the laminated planar optical waveguide type hologram element is an arbitrary value of the laminated planar optical waveguide type hologram element. While determining whether the light is emitted from the emission end of the recording layer or scattered light from a layer other than the recording layer, finally, the incident light is incident on the incident end of the target recording layer. Of the multiplexed hologram recording layer selective reading method in which the reproduced hologram image of the target recording layer is imaged and the target data is read.

A third feature of the method of the present invention is that, when selecting and reading data recorded on a multiplexed recording layer by a laminated planar optical waveguide type hologram element, light from a reproduction light source is first collected. The incident light is made incident on the incident end of the laminated planar optical waveguide hologram element including the arbitrarily selected target recording layer, and then the light intensity detected from the light emitted from the laminated planar optical waveguide hologram element To determine whether the light is emitted from an emission end of an arbitrary recording layer of the laminated planar optical waveguide type hologram element or is scattered light from a layer other than the recording layer, and the emitted light is detected. If the scattered light is detected, the reproduced hologram image is captured, data of the arbitrary recording layer is obtained, and the arbitrary recording layer is used as a position reference. To any neighborhood Moving back to the recording layer, taking a reproduction hologram image, obtaining data of any recording layer in the vicinity, using any recording layer in the vicinity as a position reference, and subsequently, selecting any A multiplex hologram recording layer obtained by moving the incident light to the incident end of the target recording layer while determining the light intensity, capturing a reproduction hologram image of the target recording layer, and reading the target data. The present invention resides in the configuration adoption of the selective reading method.

A fourth feature of the method of the present invention is that the incidence of the incident light in the first, second or third feature of the method of the present invention is perpendicular to the layer surface of the laminated planar optical waveguide hologram element. The configuration of the multiple hologram recording layer selective reading method is adopted.

A fifth feature of the method of the present invention is that the detection of the light intensity in the first, second, third or fourth feature of the method of the present invention is performed by detecting the light intensity on the layer surface of the laminated planar optical waveguide type hologram element. The present invention resides in the adoption of a configuration of a multiple hologram recording layer selective reading method performed vertically.

A sixth feature of the method of the present invention is that the incidence of the incident light in the first, second, third, or fifth feature of the method of the present invention is applied to the layer surface of the laminated planar optical waveguide type hologram element. The present invention resides in the adoption of a configuration of a multiple hologram recording layer selective reading method performed in parallel.

According to a seventh feature of the method of the present invention, the detection of the light intensity in the first, second, third, fourth or sixth feature of the method of the present invention is not limited to the above-mentioned laminated planar optical waveguide type hologram element. Of the multiple hologram recording layer selective reading method which is performed in parallel with the layer surface.

An eighth feature of the method of the present invention is that the determination of the light intensity in the second, third, fourth, fifth, sixth or seventh feature of the above-described method of the present invention is performed by using a predetermined light intensity. Of the multiplexed hologram recording layer selective reading method which is performed by comparing the detected light intensity with the threshold value.

According to a ninth feature of the method of the present invention, the movement of the incident light to the target recording layer in the eighth feature of the method of the present invention is such that the detected light intensity goes above and below the threshold value. Counting the number of times, obtaining relative position information, which is the amount of movement from the reference recording layer, from the determination result from the determination of the light intensity and the number of times the threshold value is increased or decreased, and performed based on the relative position information. The configuration of the multiple hologram recording layer selective reading method is adopted.

A tenth feature of the method of the present invention is that the reproduced hologram image in the first, third, fourth, fifth, sixth, seventh, eighth or ninth feature of the method of the present invention is as follows. A multiplex hologram recording layer selective reading method including a different servo information image in each recording layer is employed.

According to an eleventh aspect of the method of the present invention, the imaging of the reconstructed hologram image in the tenth aspect of the method of the present invention is a multiplexed hologram obtained by first imaging the servo information image in the reconstructed hologram image. It lies in the adoption of the configuration of the recording layer selective reading method.

A twelfth feature of the method of the present invention is the imaging of the reproduced hologram image in the first, third, fourth, fifth, sixth, seventh, eighth or ninth feature of the method of the present invention. However, there is a configuration of a multiple hologram recording layer selective reading method which is performed in parallel with imaging of a servo information image in which a different servo information image is captured in each recording layer separately from a reproduced hologram image.

A thirteenth feature of the method of the present invention resides in a method of selectively reading a multiple hologram recording layer, wherein the imaging of the servo information image in the twelfth feature of the present invention is performed using a light-receiving element capable of operating at high speed. Configuration adoption.

A fourteenth feature of the method of the present invention is that, in the tenth, eleventh, twelfth or thirteenth feature of the above-described method of the present invention, the movement of the incident light to the target recording layer depends on the servo information image. A multiplex hologram recording layer selective reading method is performed based on absolute position information from data.

A fifteenth feature of the method of the present invention is that, in the fourteenth feature of the method of the present invention, the movement of the incident light to the target recording layer is determined based on the servo information image data serving as a reference. And a method for selectively reading multiple hologram recording layers based on the relative position information based on the absolute position information.

A sixteenth feature of the method of the present invention is that the servo information image in the tenth, eleventh, twelfth, thirteenth, fourteenth, or fifteenth feature of the above-described method of the present invention is a multiplex hologram recording wherein the servo information image is small. The present invention resides in the configuration adoption of the layer selective reading method.

A seventeenth feature of the method of the present invention is that the method of the present invention includes the tenth, eleventh, twelfth, thirteenth, fourteenth, and first features.
In the fifth or sixteenth aspect, the servo information image is a simple hologram recording layer selective reading method in which the servo information image is a simple pattern including a planar pattern and a two-dimensional barcode.

A first feature of the apparatus of the present invention is a multiple hologram recording layer selective reading apparatus for selectively reading data recorded on a multiple recording layer by hologram recording, which is incorporated in a multiple hologram recording medium and has a scattering factor. A reproduction light source, which is a light source that emits light to the incident end of a laminated planar optical waveguide hologram element in which a recording layer on which the hologram is recorded is laminated, and light from the reproduction light source is focused so as to be freely focused. A condenser lens that converts the incident light, an incident light moving device that moves the incident light by integrally moving the reproduction light source and the condenser lens, and a diffracted light by the guided light in the laminated planar optical waveguide hologram element. A hologram image pickup device having a hologram image pickup device for picking up a reproduced hologram image of the hologram device; A light intensity detector for detecting the light intensity of the light emitted from the end and the scattered light from the layers other than the recording layer, and the light intensity detected by the light intensity detector connected to the incident light moving device and emitted by the light intensity detector. And a light intensity discriminating circuit for discriminating between a hologram recording layer and a scattered light.

A second feature of the apparatus of the present invention is that the laminated planar optical waveguide type hologram element according to the first feature of the above-described apparatus of the present invention is configured so that the incident light reflects the incident light and couples it to the incident end of the recording layer. Surface, the reproduction light source, the incident light moving device, and the condenser lens are oriented vertically, and the incident light is applied to the incident reflection surface perpendicularly to the layer surface of the laminated planar optical waveguide hologram element. The present invention resides in adopting the configuration of the multiple hologram recording layer selective reading device provided.

A third feature of the device of the present invention is that the laminated planar optical waveguide hologram element according to the first or second feature of the device of the present invention controls the direction by reflecting the emitted light at an emission end. It has an output reflecting surface, and the light intensity detector is installed so as to detect the light intensity perpendicular to the layer surface of the laminated planar optical waveguide hologram element. is there.

A fourth feature of the device of the present invention is that the reproducing light source, the incident light moving device and the condenser lens in the first or third feature of the device of the present invention are laterally oriented and the incident light is Another object of the present invention is to adopt a configuration of a multiple hologram recording layer selective reading device which is provided so as to be in contact with an incident end in parallel with a layer surface of a laminated planar optical waveguide hologram element.

A fifth feature of the device of the present invention is that the light intensity detector in the first, second or fourth feature of the device of the present invention is arranged so that the light intensity detector is parallel to a layer surface of the laminated planar optical waveguide type hologram element. A multiplex hologram recording layer selective reading device provided so as to detect light intensity is employed.

A sixth feature of the device of the present invention resides in that the laminated planar optical waveguide type hologram element in the first, second, third, fourth or fifth feature of the device of the present invention guides the incident light. A core layer, which is a recording layer as an optical waveguide for converting wave light,
A multiplex hologram recording layer selective reading device in which a clad layer that scatters the incident light as scattered light is alternately formed as a multilayer.

A seventh feature of the device of the present invention resides in that the multiple hologram recording layer selective reading device according to the first, second, third, fourth, fifth or sixth feature of the above-described device of the present invention, A multiplex hologram recording layer selective reading device is provided which has a counter connected to an emission moving device and counting the number of times the light intensity threshold value determined by the light intensity determination circuit rises and falls.

An eighth feature of the device of the present invention is that the multiplex hologram recording medium in the first, second, third, fourth, fifth, sixth or seventh feature of the device of the present invention is a card type. And the configuration of a multiple hologram recording layer selective reading device including

A ninth feature of the device of the present invention resides in that the light from the reproduction light source in the first, second, third, fourth, fifth, sixth, seventh or eighth feature of the device of the present invention described above. However, there is a configuration adoption of a multiple hologram recording layer selective reading device including a laser beam.

A tenth feature of the device of the present invention resides in that the incident light in the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth feature of the above-described device of the present invention. A moving apparatus has a configuration of a multiple hologram recording layer selective reading apparatus including an element including a piezoelectric element, which is a piezoelectric element.

An eleventh feature of the device of the present invention is the same as the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth or tenth feature of the device of the present invention. The hologram imaging device is configured to employ a multiplex hologram recording layer selective reading device including a CCD.

The twelfth feature of the device of the present invention is that the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, or eleventh of the above-described device of the present invention. A multiplexed hologram recording layer selective reading device having a servo information determining circuit that is connected to the incident light moving device and determines which recording layer the servo information image from the hologram imaging device belongs to. In this case, the multiple hologram recording layer selective reading device is constituted.

A thirteenth feature of the present invention apparatus is the multiple hologram recording layer selective reading apparatus in which the servo information image in the twelfth feature of the present invention apparatus is formed at an imaging start portion in the reproduced hologram image. Configuration adoption.

The fourteenth feature of the device of the present invention is that the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, or eleventh of the above-described device of the present invention. The multiplexed hologram recording layer selective reading device according to the above feature is an array that captures a servo information image so that it can operate at high speed, and the servo information image from the array that is connected to the incident light moving device is of any recording layer. And a servo information discriminating circuit for discriminating whether there is a hologram recording layer selective reading device.

A fifteenth feature of the device of the present invention is that the array in the fourteenth feature of the device of the present invention adopts a configuration of a multiple hologram recording layer selective reading device in which a small number of light-receiving elements operable at high speed. It is in.

A sixteenth feature of the device of the present invention resides in the adoption of a configuration of a multiple hologram recording layer selective reading device in which the light receiving element in the fifteenth feature of the device of the present invention includes a PD (photodiode).

A seventeenth feature of the device of the present invention is that the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, and eleventh of the above-described device of the present invention. , Twelfth, thirteenth, fourteenth,
The apparatus for selectively reading multiple hologram recording layers according to the fifteenth or sixteenth aspect, wherein the reproduction light source is fixed, and an optical fiber is provided between the reproduction light source and the condenser lens.
The incident light moving device is configured to adopt a multiplex hologram recording layer selective reading device in which the condensing lens and the optical fiber are configured to be integrally movable so as to move the incident light.

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the accompanying drawings, an apparatus example 1 and a corresponding method example 1 according to an embodiment of the present invention, similarly, an apparatus example 2 and a corresponding method example 2, Similarly, a description will be given of an apparatus example 3 and a corresponding method example 3, and similarly an apparatus example 4 and a corresponding method example 4.

(Example of Apparatus 1) An example of this apparatus will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a multiplexed hologram recording layer selective reading device α in the present device example.
FIG. 2 is an explanatory diagram of a multiplexed hologram recording layer selective reading device α in the present device example, and FIG. 2A is a configuration explanatory diagram of a multiplexed hologram recording layer selective reading device α.
(B) is an explanatory diagram of scattered light in the multiple hologram recording layer selective reading device α.

Multiple hologram recording layer selective reading device α
Is a laminated planar optical waveguide hologram element 1 in which a recording layer on which a hologram as a scattering factor is recorded is laminated to guide light, and a multiplex hologram recording card medium which is a medium having the laminated planar optical waveguide hologram element 1 2, a reproduction light source 3 which is a vertical light source such as a laser beam which is directed perpendicularly to the layer surface of the laminated planar optical waveguide type hologram element 1, and light from the reproduction light source 3 is focused so as to be freely focused and incident light. 4, a condensing lens 5 for converting the light into a condensing lens 4, an incident light moving device 6 for moving the incident light 4 by moving the reproducing light source 3 and the condensing lens 5 together and having a piezoelectric element such as a piezo element, and a laminated planar optical waveguide hologram. And a hologram imaging device 10 having a hologram imaging element such as a CCD for imaging a reproduced hologram image 9 from the diffracted light 8 by the guided light 7 in the element 1.

In addition, the light intensity for detecting the light intensity of the light 11 emitted from the light emitting end of the recording layer and the light intensity of the scattered light 12 from the layer other than the recording layer perpendicularly to the layer surface of the laminated planar optical waveguide type hologram element 1. A detector 13 and whether the light intensity detected by the light intensity detector 13 is that of the output light 11 or the scattered light 12
And a counter 15 for counting the result of the determination made by the light intensity determination circuit 14. The light intensity discriminating circuit 14 and the counter 15 are connected to the incident light moving device 6.

The laminated planar optical waveguide type hologram element 1 comprises:
A core layer 16 which is a recording layer as an optical waveguide for converting the incident light 4 into the guided light 7 and a clad layer 17 which scatters the incident light 4 as the scattered light 12 are alternately formed as a multilayer, and the incident light 4 is reflected. An incident reflection surface 18 for coupling to the entrance end of the core layer 16 and an exit reflection surface 19 for controlling the direction by reflecting the exit light 11 at the exit end. Further, the multiplex hologram recording card medium 2 is not limited to a card type, and other forms can be easily considered.

In the multiple hologram recording layer selective reading device α, the reproduction light source 3 is fixed,
An optical fiber may be provided between the optical fiber and the condenser lens 5, and the incident light moving device 6 may be configured to move the incident light 4 by integrally moving the condenser lens 5 and the optical fiber.

(Method Example 1) This method example is applied to Apparatus Example 1, and will be described with reference to FIGS. 1 and 2.

A laser beam is generated from the reproduction light source 3, condensed by the condenser lens 5 so as to converge on the incident reflection surface 18, and incident as incident light 4 perpendicularly to the layer surface of the laminated planar optical waveguide type hologram element 1. Let it.

As shown in FIG. 2A, when the incident light 4 is reflected by the incident reflection surface 18 of the core layer 16, the incident light 4 is combined with the incident end of the core layer 16 to form the guided light 7. Becomes
A part of the guided light 7 is diffracted by the hologram of the laminated planar optical waveguide hologram element 1 to become a diffracted light 8, and the diffracted light 8 emerges and forms a hologram image perpendicular to the layer surface of the laminated planar optical waveguide hologram element 1. The reproduced hologram image 9 is imaged, and the reproduced hologram image 9 is captured by the hologram imaging device 10 and obtained as data. The non-diffracted guided light 7 is reflected by the outgoing reflection surface 19 at the same outgoing end of the core layer 16 as the incident light, and becomes outgoing light 11 perpendicular to the laminated planar optical waveguide hologram element 1.

As shown in FIG. 2B, when the incident light 4 is reflected by the incident reflection surface 18 of the cladding layer 17, the incident light 4 is scattered according to the aperture ratio of the condenser lens 5. It becomes light 12.

The light intensity of the light emitted from the laminated planar optical waveguide type hologram element 1 is detected by the light intensity detector 13. The emitted light 11 has a strong light intensity, and the scattered light 1
No. 2 has low light intensity and is detected. The light intensity determination circuit 14
By comparing the detected light intensity with a preset threshold value of an appropriate light intensity, it is determined whether the detected light intensity is that of the light 11 emitted from the emission end of the core layer 16 or the clad layer 17.
And outputs the result of the determination to the incident light moving device 6.

When the emitted light 11 is detected according to the result of the discrimination, the hologram imaging device 10 captures the reproduced hologram image 9 to obtain data. When the scattered light 12 is detected according to the result of the discrimination, The operation of the incident light moving device 6 moves the incident light 4 so that the incident light 4 that matches the cladding layer 17 is focused on the incident end of the core layer 16 so that the incident light 4 is coupled to the core layer 16. be able to.

When the incident light 4 is extremely out of focus, the incident light 4 may be coupled to a plurality of incident end rows of the core layer 16. In this case, a part of the incident light 4 is coupled. Since the light is scattered on the incident reflection surface 18 at the end of the cladding layer 17 sandwiched between the incident end rows of the core layer 16, the light intensity determination circuit 16
Can be determined by appropriately setting the threshold value. Therefore, the incident light moving device 6 is operated using the determination result of the light intensity determination circuit 16 so that the incident light 4 can be coupled to one core layer 16 incident end.

The counter 15 counts the number of times the threshold value is increased or decreased using the result of the determination, and outputs the number to the incident light moving device 6. By moving the incident light 4 along the incident reflection surface 18, the incident end of the core layer 16 and the cladding layer 17
The edges appear periodically, and the detected light intensity reflects the periodic structure of the different layers of the laminated planar optical waveguide hologram element 1, and the discrimination result of the light intensity discrimination circuit 14 and the count in the counter 15 As a result, relative position information, which is a relative movement amount from the incident end of the core layer 16 serving as a reference, can be obtained. Based on the relative position information, the operation of the incident light moving device 6 causes the incident light 4 to enter the incident reflection surface. It is possible to move along 18.

In selecting the core layer 16 as an arbitrary target recording layer and obtaining data of the target core layer 16,
If the hologram cannot be distinguished in each of the plurality of core layers 16, the incident light 4 may first be incident anywhere on the incident end of the laminated planar optical waveguide hologram element 1.
Thereafter, the incident light 4 is moved to the uppermost or lowermost core layer 16 by the operation of the incident light moving device 6 based on the discrimination of the light intensity and aligned, and then the next uppermost or lowermost core layer 16 is referred to. Based on the relative position information from the reference core layer 16, the operation of the incident light moving device 6 based on the light intensity discrimination adjusts the position of the incident light 4 on the incident end of the target core layer 16, and The data of the reproduced hologram image 9 of the core layer 16 can be obtained.

The movement to the uppermost or lowermost core layer 16 moves the incident light 4 above or below the laminated planar optical waveguide type hologram element 1, and is periodically increased by detecting the light intensity. The last core layer 16 where light is detected moves as the top or bottom core layer 16.

The core layer 1 which is a recording layer for any purpose
6 to obtain the data of the target core layer 16, the holograms recorded in the laminated planar optical waveguide type hologram element 1 are different from each other so as to be distinguished by each of the plurality of core layers 16. If so, the incident light 4 may first be incident on the incident end of the laminated planar optical waveguide type hologram element 1, and if an arbitrary core layer 16 is detected by discrimination of the light intensity, the arbitrary core layer is detected. When an arbitrary cladding layer 17 is detected by using the position 16 as a position reference and determining the light intensity, the incident light 4 is moved to an arbitrary core layer 16 in the vicinity by the operation of the incident light moving device 6 to perform alignment. Then, based on the position of the arbitrary core layer 16 as a position reference, the target core layer 16 is incident upon the operation of the incident light moving device 6 based on the relative position information from the reference core layer 16 to determine the light intensity. And the moving aligning incident light 4 into one in which it is possible to obtain data of the reproduced hologram image 9 of the core layer 16 of the object.

Accordingly, it is possible to easily detect the coupling of the incident light 4 with the incident end of the core layer 16 based on the discrimination result from the light intensity discriminating circuit 14, and the discrimination result from the light intensity discriminating circuit 14 and the counter 15 With the relative position information, the incident light 4 can be easily moved to the target core layer 16 incident end.

(Example 2 of Apparatus) An example of this apparatus will be described with reference to FIG. FIG. 3 is a configuration explanatory view showing a multiplex hologram recording layer selective reading device β in the present example of the device.

Multiple hologram recording layer selective reading device β
A multi-hologram recording card medium 2a having a laminated planar optical waveguide hologram element 1a in which a recording layer on which a hologram is recorded as a scattering factor is laminated and which guides light; A reproduction light source 3a which is a lateral light source such as a laser beam which is applied to an incident vertical surface 18a of an incident end in parallel with a layer surface of the laminated planar optical waveguide type hologram element 1a, and light from the reproduction light source 3a is focussed freely. Lens 5a for converting incident light 4a
And an incident light moving device 6a which moves the incident light 4a by integral movement of the reproducing light source 3a and the condenser lens 5a and has a piezoelectric element such as a piezo element.

In addition, light for detecting the respective light intensities of the outgoing light 11a from the outgoing vertical surface 19a at the outgoing end and the scattered light from layers other than the recording layer in parallel to the layer surface of the laminated planar optical waveguide hologram element 1a. An intensity detector 13a, a light intensity discriminating circuit 14a for discriminating whether the light intensity detected by the light intensity detector 13a is that of the output light 11a or a scattered light, and discrimination by the light intensity discriminating circuit 14a And a counter 15a for counting the result of the determination. The light intensity discriminating circuit 14a and the counter 15a are connected to the incident light moving device 6a.

Laminated planar optical waveguide type hologram element 1a
, A core layer 16a, which is a recording layer as an optical waveguide that converts the incident light 4a into the guided light 7a, and a cladding layer 17a, which also scatters the incident light 4a as scattered light, alternately form a multilayer.

The multiplex hologram recording layer selective reading device β has a hologram having a hologram image pickup device such as a CCD for picking up a reproduced hologram image from the diffracted light of the guided light 7a of the laminated planar optical waveguide type hologram device 1a. It also has an imaging device, but is omitted in FIG.

The device example 1 has a configuration in which the incident light 4 is incident on the layer surface of the laminated planar optical waveguide type hologram element 1 perpendicularly.
This is a configuration in which the incident light 4a is made incident parallel to the layer surface a.

(Method Example 2) This method example is applied to Apparatus Example 2, and will be described with reference to FIG. The description of the details that are not particularly mentioned is the same as in the method example 1.

This example of the method is an example in which the light is not incident perpendicularly to the layer surface of the laminated planar optical waveguide type hologram element 1 in the method example 1, but is incident parallel to the layer surface of the laminated planar optical waveguide type hologram element 1a. .

The light from the reproduction light source 3a is condensed by the condenser lens 5a to be incident light 4a, and is incident on the incident vertical surface 18 at the incident end in parallel with the layer surface of the laminated planar optical waveguide type hologram element 1a.
a. The incident light 4a is combined with the incident end of the core layer 16a in the laminated planar optical waveguide hologram element 1a to become the outgoing light 11a from the outgoing vertical surface 19a, and is scattered as scattered light in the cladding layer 17a. Laminated planar optical waveguide type hologram element 1 by diffracted light from outgoing light 11a
A reproduced hologram image vertically formed and imaged on the layer surface of a is captured by a hologram imaging device to obtain data.

The light intensity of the light emitted from the laminated planar optical waveguide type hologram element 1a is detected by the light intensity detector 13a, and the detected light intensity is detected by the light intensity discriminating circuit 14a at an appropriate threshold value by the core layer 16a. Outgoing light 11 by
a, and the counter 15a counts the number of times the threshold value is increased or decreased to obtain relative position information, and obtains relative position information. The core layer 16a, which is the target recording layer, is selected based on the above, and the incident light 4a is positioned at the incident end of the target core layer 16a by the operation of the incident light moving device 6a.

The laminated planar optical waveguide hologram element 1a has either the incident reflection surface 18a 'or the emission reflection surface 19a' of the imaginary line shown in FIG. It is easily conceivable to adopt a configuration in which the incident light 5a is incident or the emitted light 11 is emitted perpendicularly to FIG.

(Example 3 of Apparatus) An example of this apparatus will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a configuration of the multiple hologram recording layer selective reading device γ in the present example of the device.

Multiple hologram recording layer selective reading device γ
Is a laminated planar optical waveguide hologram element 1b in which a recording layer on which a hologram is recorded as a scattering factor is laminated and which guides light, and a laser beam which is directed perpendicularly to the layer surface of the laminated planar optical waveguide hologram element 1b. And the like, a reproducing light source 3b which is a vertical light source, a condensing lens 5b which focuses light from the reproducing light source 3b so as to be capable of being focused and converts it into incident light 4b, and an integral movement of the reproducing light source 3b and the condensing lens 5b And an incident light moving device 6b having a piezoelectric element such as a piezo element, and a laminated planar optical waveguide type hologram element 1.
and a hologram image pickup device 10b having a hologram image pickup device such as a CCD for picking up a reproduced hologram image 9b from the diffracted light 8A by the guided light 7b and a servo information image 20 from the diffracted light 8B.

In addition, a servo information discriminating circuit 21 for discriminating which recording layer the servo information image 20 belongs to,
A light intensity detector 13b for detecting the respective light intensities of the emitted light 11b from the recording layer emission end and the scattered light from layers other than the recording layer, perpendicular to the layer surface of the laminated planar optical waveguide hologram element 1b; Light intensity discriminating circuit 14b for discriminating whether the light intensity detected by the detector 13b is that of the outgoing light 11b or scattered light, and a counter for counting the discrimination result determined by the light intensity discriminating circuit 14b. 15b. The servo information determination circuit 21, the light intensity determination circuit 14b, and the counter 15b
It is connected to the.

Stacked planar optical waveguide type hologram element 1b
The core layer 16b, which is a recording layer as an optical waveguide for converting the incident light 4b into the guided light 7b, and the cladding layer 17b, which also scatters the incident light 4b as scattered light, are alternately formed as a multilayer. It has an incident reflection surface 18b that reflects and couples to the incident end of the core layer 16b, and an emission reflection surface 19b that reflects the emitted light 11b from the emission end and controls the direction.

The multiplex hologram recording layer selective reading device γ also has a multiplex hologram recording card medium having the laminated planar optical waveguide type hologram element 1b, but is omitted in FIG.

(Example 3 of Method) This example of method is applied to Example 3 of the apparatus, and will be described with reference to FIG. Details that are not particularly mentioned are the same as those in the method example 1.

The laser light from the reproduction light source 3b is condensed by the condenser lens 5b to become incident light 4b, and when the incident light 4b is coupled to the incident end of the core layer 16b by reflection on the incident reflection surface 18b, the guided light 7b Is partially diffracted by the hologram recorded on the laminated planar optical waveguide type hologram element 1b to become a diffracted light, and the reproduced hologram image 9b is formed as a floating image.

In the reproduced hologram image 9b, the hologram of the laminated planar optical waveguide type hologram element 1b is recorded so that the imaging start portion of the reproduced hologram image 9b becomes the servo information image 20, and the hologram corresponding to the diffracted light 8A is recorded. The reproduction hologram image 9b corresponds to the diffracted light 8B, and the servo information image 20 corresponds to the laminated planar optical waveguide type hologram element 1.
b is vertically formed on the layer surface of FIG.
The servo information image 20 is captured by the hologram imaging device 10b.

At this time, a process of extracting the data of the servo information image 20 from the reproduced hologram image 9b which is a large amount of data is required.
In the case where a CCD is used, if the servo information image 20 is formed so as to float on the scanning start side of the CCD, the servo information image 20 can be scanned without scanning the entire data area, and the speed can be relatively high. Servo information image 20
From the servo information.

The data of the servo information is determined by the servo information determining circuit 21 using the data registered in advance, and the absolute position information of the core layer 16b being reproduced can be obtained. Stacked planar optical waveguide hologram element 1
Even when there are 100 core layers 16b of b, it can be determined if the data of the servo information is at least 7 bits.

Since the ratio of the servo information data to the entire data capacity is extremely small, the recording of the hologram for embossing and forming the servo information image 20 can be performed to obtain the laminated planar optical waveguide type hologram element 1b. The reduction in capacity as a whole can be almost neglected.

The light intensity of the light emitted from the laminated planar optical waveguide type hologram element 1b is detected by the light intensity detector 13b, and the detected light intensity is detected by the light intensity discriminating circuit 14b at an appropriate threshold. A determination result is output as to whether the light is emitted light 11b by the layer 16b or scattered light by the cladding layer 17b. In some cases, the counter 15b counts the number of times the threshold is raised or lowered, and obtains relative position information of the core layer 16b being reproduced based on the determination result and the number of times the threshold is raised or lowered.

In selecting the incident end of the core layer 16b as an arbitrary recording layer, the incident light 4b may be moved by the operation of the incident light moving device 6b based on the absolute position information from the servo information image 20, After obtaining the absolute position information of one core layer 16b, the incident light 4b may be moved by obtaining the incident end position from the relative position information of the light intensity determination circuit 14b and the counter 15b.

Therefore, since the absolute position information from the servo information discriminating circuit 21 is small, it is possible to substantially prevent a decrease in the capacity of the laminated planar optical waveguide hologram element 1b, and to obtain the absolute position information at a relatively high speed. Can be. Also,
The absolute position information and the relative position information from the light intensity determination circuit 14b and the counter 15b can be used in combination.

(Example 4 of Apparatus) An example of this apparatus will be described with reference to FIG. FIG. 5 is an explanatory diagram showing a configuration of the multiple hologram recording layer selective reading device δ in this example of the device.

Multiple hologram recording layer selective reading device δ
Is a laminated planar optical waveguide hologram element 1c in which a recording layer on which a hologram is recorded as a scattering factor is laminated and which guides light, and a laser beam which is applied perpendicularly to the layer surface of the laminated planar optical waveguide hologram element 1c. And the like, a reproducing light source 3c, which is a vertical light source, a condensing lens 5c for converging light from the reproducing light source 3c so as to be capable of being focused and converting it into incident light 4c, and an integral movement of the reproducing light source 3c and the condensing lens 5c And an incident light moving device 6c having a piezoelectric element such as a piezo element, and a laminated planar optical waveguide type hologram element 1.
and a hologram imaging device 10c having a hologram imaging element such as a CCD for imaging a reproduced hologram image 9c from the diffracted light 8C by the guided light 7c in c.

In addition, an array 22 such as a PD which can operate at high speed for picking up a servo information image 20c from the diffracted light 8D by the guided light 7c in the laminated planar optical waveguide type hologram element 1c, and a servo pattern information image Servo information discriminating circuit 21c for discriminating which recording layer 20c belongs to
A light intensity detector 13c for detecting the respective light intensities of the emitted light 11c from the recording layer emission end and the scattered light from layers other than the recording layer perpendicular to the layer surface of the laminated planar optical waveguide hologram element 1c; A light intensity discriminating circuit 14c for discriminating whether the light intensity detected by the intensity detector 13c is that of the emitted light 11c or that of the scattered light, and a light intensity discriminating circuit 14
a counter 15 for counting the result of the determination made in step c
c. Further, the servo information determination circuit 21c, the light intensity determination circuit 14c, and the counter 15c are connected to the incident light moving device 6c.

Stacked planar optical waveguide type hologram element 1c
Is formed such that a core layer 16c, which is a recording layer as an optical waveguide for converting the incident light 4c into the guided light 7c, and a cladding layer 17c, which also scatters the incident light 4c as scattered light, are alternately formed as a multilayer. It has an incident reflecting surface 18c that reflects and couples to the incident end of the core layer 16c, and an emitting reflecting surface 19c that reflects the emitted light 11c from the emitting end to control the direction.

Note that the multiplex hologram recording layer selective reading device δ also has a multiplex hologram recording card medium having the laminated planar optical waveguide type hologram element 1c, but is omitted in FIG.

(Example 4 of Method) This example of method is applied to Example 4 of the apparatus, and will be described with reference to FIG. The details that are not particularly mentioned are the same as in Method Example 3.

The laser light from the reproduction light source 3c is converted into the incident light 4c by the condenser lens 5c, and the incident reflection surface 18c of the incident light 4c is formed.
When coupling with the incident end of the core layer 16c by reflection at
The guided light 7c is applied to the laminated planar optical waveguide hologram element 1c.
A part of the hologram is diffracted by the hologram recorded on the hologram to become a diffracted light, and the reproduced hologram image 9c from the diffracted light 8C
And the servo pattern information image 20c from the diffracted light 8D separated to the preceding position separately from the reproduction hologram image 9c emerges vertically on the layer surface of the laminated planar optical waveguide hologram element 1c.

As the pattern of the servo pattern information image 20c, for example, a checkerboard pattern combination or a two-dimensional barcode can be used, but the pattern is not limited to these as long as it is a simple one that can identify each core layer 16c.

The reproduced hologram image 9c is picked up using the hologram image pickup device 10c, and the servo pattern information image 20c is picked up.
c, an image is captured using an array 22 such as a PD that can operate at high speed separately from the hologram imaging device 10c. Since the pattern of the servo pattern information image 20c is a simple two-dimensional pattern, even if error correction, an imaging position error, and the like are taken into consideration, a small amount of PD or the like is used for imaging the pattern of the servo pattern information image 20c. .

As described above, the servo pattern information image 20c is precedently separated from the reproduced hologram image 9c, and the servo pattern information image 20c is picked up by the array 22 capable of moving at high speed, thereby obtaining servo pattern information data at high speed. Can be.

The servo pattern information data is discriminated as to which core layer 16c it is by using data registered in advance by the servo information discriminating circuit 21c, and the servo information discriminating circuit 21c transfers the data to the absolute position information of the core layer 16c being reproduced. Is converted.

The light intensity of the light emitted from the laminated planar optical waveguide hologram element 1c is detected by the light intensity detector 13c, and the detected light intensity is detected by the light intensity determination circuit 14c at an appropriate threshold. A determination result is output as to whether the light is emitted light 11c by the layer 16c or scattered light by the cladding layer 17c. In some cases, the number of times the threshold is increased or decreased is counted by the counter 15c, and the relative position information of the core layer 16c being reproduced is obtained based on the determination result and the number of times the threshold is increased or decreased.

Further, when selecting an incident end of an arbitrary core layer 16c, the incident light moving device 6c may be operated to move and select the incident light 4c based on the absolute position information from the servo pattern information image 20c. Alternatively, after obtaining the absolute position information of one core layer 16c, the position may be obtained from the relative position information of the light intensity discriminating circuit 14c and the counter 15c to move and select the incident light 4c.

Therefore, the absolute position information can be obtained at a higher speed than in the method example 3 by using the reproduced hologram information 9c and the separated servo pattern information image 20c by using the array 22 such as a PD which can operate at a high speed. Since the number of PDs and the like in the array 22 is small, the size and cost of the device can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not necessarily limited only to the above-described means and methods, and achieves the object of the present invention and achieves the effects of the present invention. Changes can be made as appropriate within the scope of the above.

[0108]

As described above, according to the present invention,
In order to obtain the data of the reproduced hologram image of any recording layer,
Even when selecting a core layer which is an arbitrary recording layer in a laminated planar optical waveguide hologram element on a multiplex hologram recording card medium, data of a reproduced hologram image of a target recording layer can be easily and quickly obtained. it can.

Further, since the absolute position information is reduced, the capacity of the laminated planar optical waveguide type hologram element can be substantially prevented from decreasing, and the size and cost of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first multiple hologram recording layer selective reading device according to an embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams of the above, in which FIG. 2A is an explanatory diagram of a configuration of a first multiplexed hologram recording layer selective reading device, and FIG. 2B is an explanatory diagram of scattered light.

FIG. 3 is a configuration explanatory view showing a second multiplexed hologram recording layer selective reading device according to an embodiment of the present invention.

FIG. 4 is a configuration explanatory view showing a third multiplexed hologram recording layer selective reading device according to an embodiment of the present invention.

FIG. 5 is a configuration explanatory view showing a fourth multiplexed hologram recording layer selective reading device according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing a conventional card-type storage medium.

[Explanation of symbols]

α, β, γ, δ: multiple hologram recording layer selective reading device 1, 1a, 1b, 1c: laminated planar optical waveguide type hologram element 2: multiple hologram recording card medium 3, 3a, 3b, 3c: reproduction light source 4, 4a , 4b, 4c: incident light 5, 5a, 5b, 5c: condenser lens 6, 6a, 6b, 6c: incident light moving device 7, 7a, 7b, 7c: guided light 8, 8a, 8A, 8B, 8C, 8D: Diffracted light 9, 9b, 9c: Reconstructed hologram image 10, 10b, 10c: Hologram imaging device 11, 11a, 11b, 11c: Outgoing light 12: Scattered light 13, 13, 13a, 13b, 13c: Light intensity detector 14, 14a, 14b, 14c: Light intensity discriminating circuit 15, 15a, 15b, 15c: Counter 16, 16a, 16b, 16c: Core layer 17, 17a, 17b, 17c: Cladding layer 18 18a ', 18b, 18c: Incident reflecting surface 19, 19a', 19b, 19c: Outgoing reflecting surface 18a: Incident vertical surface 19a: Outgoing vertical surface 20: Servo information image 20c: Servo pattern information image 21, 21c: Servo information discrimination Circuit 22: Array ε: IC card type storage medium device 23: IC card medium 24: Card guide 25: Read / write electrode 26: Read / write head

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Manabu Yamamoto Nippon Telegraph and Telephone Corporation 3-9-1-2 Nishishinjuku, Shinjuku-ku, Tokyo (56) References JP-A-4-117683 (JP, A) JP-A-11-224043 (JP, A) JP-A-11-345419 (JP, A) JP-A-62-294472 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03H 1 / 00-1/32

Claims (34)

(57) [Claims] In selecting and reading data holographically recorded on multiple recording layers by a laminated planar optical waveguide hologram element, while moving incident light to an arbitrary selected recording layer incident end, Detecting the light intensity of the emitted light emitted from the emission end, identifying the target recording layer by a change in the light intensity accompanying the movement, capturing a reproduction hologram image, and reading the target data. Hologram recording layer selective reading method. 2. In selecting and reading data recorded on a multiplexed recording layer by a laminated planar optical waveguide hologram element, first, incident light obtained by condensing light from a reproduction light source is arbitrarily selected. The light is incident on the incident end of the laminated planar optical waveguide hologram element including the target recording layer, and then the incident light is moved to the uppermost or lowermost recording layer as a position reference, and further arbitrarily selected. While moving the incident light to the target recording layer, the light intensity detected from the light emitted from the laminated planar optical waveguide hologram element is changed to an arbitrary recording layer of the laminated planar optical waveguide hologram element. In the end, while determining whether the light is emitted from the output end or is scattered light from a layer other than the recording layer, the incident light is positioned at the incident end of the target recording layer. The purpose A multi-hologram recording layer selective reading method, wherein a reproduction hologram image of the recording layer is captured and target data is read. 3. In selecting and reading data recorded on a multiplexed recording layer by a laminated planar optical waveguide hologram element, first, incident light obtained by condensing light from a reproduction light source is arbitrarily selected. The light is incident on the incident end of the laminated planar optical waveguide hologram element including the target recording layer, and then the light intensity detected from the light emitted from the laminated planar optical waveguide hologram element is used as the intensity of the laminated planar optical waveguide hologram. It is determined whether the light is emitted from an emission end of an arbitrary recording layer of the element or is scattered light from a layer other than the recording layer. If the emitted light is detected, a reproduced hologram image is obtained. To obtain the data of the arbitrary recording layer, and use the arbitrary recording layer as a position reference. When the scattered light is detected, the incident light is transmitted to a nearby arbitrary recording layer. Move it again, An image of the reproduction hologram image is obtained, data of an arbitrary recording layer in the vicinity is obtained, and the arbitrary recording layer in the vicinity is used as a position reference, and subsequently, arbitrarily selected to the incident end of the target recording layer. Performing the movement of the incident light while determining the light intensity,
A hologram recording layer selective reading method, wherein a reproduction hologram image of the target recording layer is captured and target data is read. 4. The multiple hologram recording layer selective reading method according to claim 1, wherein the incident light is incident perpendicularly to a layer surface of the laminated planar optical waveguide type hologram element. 5. The multiple hologram recording layer selective reading according to claim 1, wherein the detection of the light intensity is performed perpendicular to a layer surface of the laminated planar optical waveguide type hologram element. Method. 6. The multiple hologram recording layer selective reading according to claim 1, wherein the incident light is incident parallel to a layer surface of the laminated planar optical waveguide hologram element. Method. 7. The multiple hologram recording layer according to claim 1, wherein the detection of the light intensity is performed in parallel with a layer surface of the laminated planar optical waveguide type hologram element. Selective reading method. 8. The method according to claim 2, wherein the determination of the light intensity is performed by comparing a predetermined light intensity threshold value with a detected light intensity. 8. The method for selectively reading a multiplex hologram recording layer according to 6 or 7. 9. The movement of the incident light to the target recording layer is performed by counting the number of times the detected light intensity goes above and below the threshold value, and discriminating a result from the light intensity discrimination and the threshold. 9. The multiple hologram recording layer selective reading according to claim 8, wherein relative position information, which is a movement amount from a reference recording layer, is obtained from the number of times the value is increased and decreased, and the relative position information is read based on the relative position information. Method. 10. The multiplex hologram recording according to claim 1, wherein the reproduced hologram image includes a different servo information image in each recording layer. Layer selection reading method. 11. The multiple hologram recording layer selective reading method according to claim 10, wherein the imaging of the reproduced hologram image is performed by first imaging the servo information image in the reproduced hologram image. 12. The imaging of the reproduced hologram image is performed in parallel with the imaging of a servo information image that is separated from the reproduced hologram image and captures a different servo information image in each recording layer. The multiple hologram recording layer selective reading method according to claim 1, 3, 4, 5, 6, 7, 8, or 9. 13. The multiple hologram recording layer selective reading method according to claim 12, wherein the imaging of the servo information image is performed using a light receiving element capable of operating at high speed. 14. The apparatus according to claim 10, wherein the movement of the incident light to the target recording layer is performed based on absolute position information from the data of the servo information image. Multiple hologram recording layer selective reading method. 15. The movement of the incident light to the target recording layer is obtained by obtaining the absolute position information from data of the servo information image as a reference, and based on the relative position information based on the absolute position information. 15. The method for selectively reading a multiplexed hologram recording layer according to claim 14, wherein the method is performed. 16. The apparatus according to claim 10, wherein the servo information image is a small amount.
Or the multiple hologram recording layer selective reading method according to item 15. 17. The servo information image according to claim 10, wherein the servo information image is a simple pattern including a plane pattern and a two-dimensional bar code.
17. The method for selectively reading a multiplexed hologram recording layer according to 4, 15, or 16. 18. A multiple hologram recording layer selective reading device for selectively reading data recorded on a multiple recording layer by hologram recording, wherein the recording layer is incorporated in a multiple hologram recording medium and records a hologram as a scattering factor. , A reproduction light source that is a light source that shines on the incident end of a laminated planar optical waveguide hologram element, and a condensing lens that condenses the light from the reproduction light source into a focusable beam and converts it into incident light. An incident light moving device that moves the incident light by integrally moving the reproduction light source and the condenser lens; and to capture a reproduction hologram image from diffracted light by the guided light in the laminated planar optical waveguide hologram element. A hologram imaging device having a hologram imaging device, and light emitted from the recording layer emission end of the laminated planar optical waveguide hologram device and A light intensity detector for detecting the light intensity of scattered light from a layer other than the recording layer; and a light intensity detector connected to the incident light moving device and detecting whether the light intensity detected by the light intensity detector is that of emission light. A multiplexed hologram recording layer selective reading device, comprising: a light intensity discriminating circuit for discriminating whether or not the light is light. 19. The laminated planar optical waveguide hologram element has an incident reflection surface that reflects the incident light and couples the incident light to the incident end of the recording layer, wherein the reproduction light source, the incident light moving device, and the light condensing element. 19. The hologram recording apparatus according to claim 18, wherein the lens is arranged vertically so that the incident light is directed perpendicularly to a layer surface of the laminated planar optical waveguide hologram element on the incident reflection surface. Layer selection reader. 20. The laminated planar optical waveguide hologram element, wherein the laminated planar optical waveguide hologram element has an emission reflection surface for controlling the direction by reflecting the emitted light at an exit end; 20. The multiple hologram recording layer selective reading device according to claim 18, wherein the device is installed so as to detect the light intensity perpendicular to a layer surface of the element. 21. The reproduction light source, the incident light moving device, and the condenser lens are arranged in a horizontal direction so that the incident light impinges on an incident end in parallel with a layer surface of the laminated planar optical waveguide hologram element. The multiple hologram recording layer selective reading device according to claim 18 or 20, wherein: 22. The apparatus according to claim 18, wherein the light intensity detector is installed so as to detect the light intensity in parallel with a layer surface of the laminated planar optical waveguide type hologram element. The multiplex hologram recording layer selective reading device according to the above. 23. The laminated planar optical waveguide hologram element, wherein a core layer which is a recording layer as an optical waveguide for converting the incident light into guided light, and a clad layer which scatters the incident light as scattered light are alternately arranged. 20. The method according to claim 19, wherein the layer is formed as a multilayer.
3. The multiple hologram recording layer selective reading device according to 2. 24. The multiplexed hologram recording layer selective reading device includes a counter connected to the incident light moving device and counting the number of times the light intensity threshold value determined by the light intensity determination circuit rises and falls. 18. The method of claim 18, 19, 20, 21, 22, wherein:
24. The multiple hologram recording layer selective reading device according to 23. 25. The multiplex hologram recording medium includes a card type.
25. The multiple hologram recording layer selective reading device according to 2, 23 or 24. 26. The light source according to claim 18, wherein the light from the reproduction light source includes a laser beam.
26. The multiple hologram recording layer selective reading device according to 2, 23, 24 or 25. 27. The apparatus according to claim 18, wherein said incident light moving device has an element including a piezoelectric element, which is a piezoelectric element.
27. The multiple hologram recording layer selective reading device according to 2, 23, 24, 25 or 26. 28. The hologram imaging device according to claim 18, further comprising a CCD.
28. The multiple hologram recording layer selective reading device according to 2, 23, 24, 25, 26 or 27. 29. A multiplexed hologram recording layer selective reading device, comprising: a servo information discriminating circuit connected to the incident light moving device, for discriminating which recording layer the servo information image from the hologram imaging device belongs to; 18. The method according to claim 18, wherein:
29. The multiple hologram recording layer selective reading device according to 2, 23, 24, 25, 26, 27 or 28. 30. The multiple hologram recording layer selective reading device according to claim 29, wherein the servo information image is formed at an imaging start portion in the reproduced hologram image. 31. The multiplexed hologram recording layer selective reading device, comprising: an array for picking up a servo information image operable at a high speed; and an optical disk connected to the incident light moving device, wherein the servo information image from the array is assigned to which recording layer. And a servo information discriminating circuit for discriminating whether or not the information is the one.
29. The multiple hologram recording layer selective reading device according to 2, 23, 24, 25, 26, 27 or 28. 32. The multiple hologram recording layer selective reading device according to claim 31, wherein said array has a small number of light receiving elements operable at high speed. 33. The multiple hologram recording layer selective reading device according to claim 32, wherein said light receiving element includes a PD (photodiode). 34. The apparatus for selectively reading a multiplex hologram recording layer, wherein the reproducing light source is fixed, an optical fiber is provided between the reproducing light source and the condenser lens, and the incident light moving device transmits the incident light. 21. The condensing lens and the optical fiber are configured to be integrally movable so as to move.
2, 23, 24, 25, 26, 27, 28, 29, 3,
34. The multiple hologram recording layer selective reading device according to 0, 31, 32 or 33.