JPS5858578A - Hologram reproducing device - Google Patents

Abstract

PURPOSE:To reproduce optional one of plural holograms to make the device small-sized, by providing a shutter, where plural windows for irradiation control of respective holograms are provided to face to respective holograms, near a hologram recording plate. CONSTITUTION:The reproducing illumination light from a light source 3 becomes a spread luminous flux 3a through luminous flux spreading lenses 5a and 5b and is irradiated to all holograms 2a, 2b- on a hologram recording plate 1. A shutter 6 having plural windows 9a, 9b- which face to respective holograms 2a, 2b- and are opened and closed is arranged in front of the hologram recording plate 1; and when a voltage is applied to the electrode of a desired window 9, the quantity of light transmission of the liquid crystal of this window 9 is changed, and the reproducing illumination light 3a is transmitted through the window 9. That is, the voltage application is controlled by an opening/closing controlling means 7 to control the opening and the closing of windows 9a, 9b-. Thus, the whole of the device is made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hologram reproducing apparatus for reproducing any one hologram out of a plurality of holograms arranged on a single hologram recording plate.

A plurality of holograms 2a on one hologram recording plate 1,
Conventionally, in order to sequentially or selectively reproduce a desired hologram when 2B, 2C, ...... are arranged, the reproduction illumination light is used as shown in FIG. A desired hologram 2 is irradiated with the reproduction illumination light 3a by moving the hologram recording plate 1 or by moving the hologram recording plate 1. Therefore, a moving device (not shown) for the reproduction illumination light 3a or the hologram recording plate 1 is required, and especially when a large number of holograms are arranged on one hologram recording plate 1, the reproduction illumination light 3a or This has the disadvantage that the precision of the moving device for the hologram recording plate 1 must be increased, resulting in increased costs. In FIG. 1, 3 is a light source, and 4 is a photoelectric element that receives diffracted light from the hologram and converts it into an electrical signal.

Therefore, for example, when realizing a public telephone in which a hologram recording plate in which a large number of holograms are arranged is inserted and a reproduction illumination light is irradiated to reproduce the hologram on the hologram recording plate and make a call possible, the above-mentioned It is necessary to install a device for moving the reproduction illumination light or a device for moving the hologram recording plate 1 inside the public telephone, as shown in the figure below. Installing a mobile phone requires space for its movement, resulting in a significant increase in the size of the phone case, and requires higher precision for the mobile device itself, making it extremely expensive. This was a factor that made it difficult.

It is an object of the present invention to provide a hologram reproduction device that overcomes the above-mentioned drawbacks.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic diagram showing the configuration of an embodiment of a hologram reproduction device according to the present invention.

In FIG. 2, 1 is a large number of holograms 2a.

2 b, 2 c, . . . are arranged on a hologram recording plate, 3 is a light source that emits reproduction illumination light, and 3 a is reproduction illumination light. In addition to coherent laser light, it is also possible to use white light with poor coherence, such as a projection light bulb or an ordinary incandescent light bulb, as illumination light for reproduction. Reference numeral 4 denotes a photoelectric element that converts diffracted light 3b obtained by irradiating an arbitrary hologram on the hologram recording plate 1 with reproduction illumination light 3a into an electrical signal, and these elements are explained in the conventional example in FIG. It is similar to what was done. The reproduction illumination light 3a from the light source 3 illuminates all the holograms 2a and 2b on the hologram recording plate 1 by the beam expanding lenses 5'a and 5b.
, 2 c, . . . are enlarged so that they can be irradiated.

A shutter 6 having a plurality of windows that opens and closes facing each of the holograms 2a, 2b, 2C, . . . is arranged on the front surface of the hologram recording plate 1.
Then, which window is opened is controlled by the opening/closing control means 7.

The shutter 6 is, for example, a liquid crystal shutter 8 as shown in FIG.
It consists of

In Figure 3, 9 a, 9 b, 9 c,...
... are each hologram 2a on the hologram recording plate 1,
2b, 2C1, . . . are windows that are arranged facing each other and can be opened and closed freely. Each room 9a, 9b,
9c, . . . are provided with electrodes (not shown) for opening/closing control, and when a voltage is applied to the electrodes of a desired window 9, the amount of light transmitted through the liquid crystal of that window 9 changes. The window 9
The reproduction illumination light 3a is transmitted. Therefore, the opening/closing control means 7
By controlling the voltage application by
b, 9c, . . . are controlled to open and close.

FIG. 4 shows an example of an integral structure of the opening/closing control means 7. As shown in FIG.

That is, this opening/closing control means 7 has an I10 port 71,
It includes a CPU 72, a RAM 73, a ROM 74, a data conversion circuit 75, an X driver 76, and a Y driver 77. Windows 9a, 9b, 9c of the liquid crystal shutter 8...
・Opening/closing control is possible by setting the opening/closing order of the GJ windows in advance in ROM7.
4 and the CPU via I10 port 71.
When a window opening command is input to CLJP72, CLJP72
74 is read out and a window opening command is given to the data conversion circuit 75 in accordance with the opening/closing order. Data conversion circuit 7
5 receives the signal from the CPU 72, the X driver 7
6. Input a drive signal to the Y driver 77 to open a predetermined window. When the reproduction of one hologram is completed in this way, the CPU 72 outputs a signal for closing the aperture window to the X driver 76 and the Y driver 77 via the data conversion circuit 75 to close the aperture window.
A command is issued to open the next predetermined window according to the order stored in M74, and the same operation is repeated.

Note that the RAM 73 is used for inputting information from the reproduction of the hologram oriented in the i direction to the open window to the CPtJ 72 via the I10 port and storing it in accordance with a command from the CPU 72.

In FIG. 4, CB represents a control bus, AB represents an address bus, and DB represents a data bus.

As described above, in the hologram reproducing apparatus of the second embodiment, the reproducing illumination light 3a from the light source 3 is expanded in luminous flux by the lenses 5a and 5b, and is irradiated onto the entire surface of the liquid crystal shutter 8. When a desired window 9 of the liquid crystal shutter 8 is opened under the control of the opening/closing control means 7, the reproduction illumination light 3a is applied only to the hologram 2 facing the open window 9, and only this hologram 2 is reproduced. Become. Then, one of the windows 9 is opened sequentially or selectively by the opening/closing control means 7, and a desired hologram 2 is reproduced.

Note that the shutter 6 may be provided behind the hologram recording plate 1, as shown in FIG. In this case, the 1-gram recording sheet metal is illuminated by the reference target, and the opening and closing of the eight windows of the shutter is controlled so that only the diffracted light diffracted by the desired hologram is selectively transmitted.

FIG. 6 shows a public telephone incorporating the above-mentioned hologram reproduction device. In the same figure, 11 is a public phone! ! !
A housing, 12 an insertion opening for inserting the hologram recording plate 1 into the housing 11, 13 a reflecting mirror, and 14 an insertion opening 12.
a conveying device for conveying the hologram recording plate 1 inserted into the
Reference numeral 15 denotes a hologram destruction device for erasing the hologram corresponding to the communication frequency used when the communication is established.

That is, when a telephone user inserts the hologram recording plate 1, on which a plurality of holograms of information regarding the call frequency and the like are arranged, into the insertion slot 12, the hologram recording plate 1 is conveyed to the rear surface of the shutter 6 by the conveying device 14. The eight windows of the shutter 6 are sequentially or selectively opened by the opening/closing control means 7, and the plurality of holograms on the hologram recording plate 1 are sequentially or selectively irradiated with the reproduction illumination light 3a. When each hologram information is read and it is determined that the call power remains, the call is enabled. When the call is established, the hologram corresponding to the frequency of use is erased by the hologram destruction device 15 (the hologram recording plate 1 is transported to the hologram destruction device 15 by the transport device @14). When the call ends, the hologram recording plate 1 is returned to the insertion slot 12 by the transport device 14.

FIG. 7 shows an example of the configuration of a mechanical shutter used as the shutter 6. As shown in FIG.

In FIG. 7, reference numeral 21 denotes a flexible light-shielding belt provided with rectangular holes 22a, 22b, 22c, .
, 23b. The rotating wheel 23a is a shaft 2 that is rotatably supported horizontally between the outer frames 24a and 24b.
5a, and the rotating ring 23b is rotatably attached to the shaft 25b. Axis 25a is step motor 2
Rotationally driven by 6a. Protrusions 27 are protruded from the rotating wheels 23a and 23b, and locking holes 28 into which the protrusions 27 are locked are provided on both sides of the light-shielding belt 21, so that the shaft 25a can be rotated by the step motor 26a. When the light shielding belt 21 is turned, the light shielding belt 21 moves according to the rotation of the shaft 25.

A rotating ring 29 a is rotatably attached to the shaft 25 a inside the rotating rings 23 a, 23 a.

Further, a rotating ring 29b is fixed to the shaft 25b inside the rotating rings 23b, 23b.

Rectangular holes 30a, 30b, 30C', .
A light shielding belt 31 provided with... is wound around. The rotating wheels 29a and 29b are the rotating wheels 23a.
, 23b, the light shielding belt 31 is located inside the light shielding belt 21, as shown in FIG. 7(b). The shaft 25b is a step motor 26b
Rotationally driven by. Rotating wheels 29a, 29b
A protrusion 32 is provided protrudingly provided on the shading belt 310, and locking holes 33 into which the protrusion 32 is latched are provided on both sides of the shading belt 310. Therefore, when the shaft 25b is rotated by the step motor 26b, the shading belt 31 moves according to the rotation of the shaft 25b. Therefore, by moving the two overlapping light shielding belts 21, 31 using step motors 26a and 26b, and aligning the two holes 22 and 30 at the desired hologram position on the hologram recording plate 1,
The reproduction illumination light 3a passes through the hole 22.30 and is irradiated onto a desired hologram.

Therefore, the shutter is opened and closed by controlling the driving of the two step motors 26a and 26b using the same opening/closing control means 7 as described above.

As explained above, the hologram playback device according to the present invention is provided with a shutter that can irradiate each hologram when a large number of holograms are arranged on a single hologram recording plate, making the entire device extremely compact. Not only is the arrangement easier, but there is no need for any conventional reproducing illumination light or complicated moving device for the hologram recording plate. Therefore, it can be easily and inexpensively installed in a narrow space where complex components are arranged in a high density, such as in a public telephone, and a hologram recorder can record a wide variety of information in a high density. Any desired information can be efficiently reproduced accurately and quickly from the board. Furthermore, according to the reproduction method of the present invention, the hologram recording plate and the reproduction illumination light that illuminates each hologram on the hologram recording plate are always in a fixed position, so that the holograms are arranged in a high density. Accurate playback is possible even when

[Brief Description of the Drawings] Fig. 1 is a schematic diagram showing the configuration of a conventional hologram reproducing device, Fig. 2 is a schematic diagram showing the configuration of an embodiment of the hologram reproducing device according to the present invention, and Fig. 3 is a schematic diagram showing the configuration of an embodiment of the hologram reproducing device according to the present invention. FIG. 4 is a block diagram showing an embodiment of the shutter window opening/closing control means, and FIG. 5 is a schematic diagram showing an embodiment of the liquid crystal shutter used in the hologram reproduction device of the present invention. A schematic diagram showing an embodiment, FIG. 6 is a schematic diagram showing a public telephone to which a hologram reproduction device according to the present invention is applied, and FIG. 7 (
7(a) is a front view of the mechanical shutter, and FIG. 7(b) is a sectional view taken along line I-1 in FIG. 7(a). 1... Hologram recording plate, 2a, 2b, 2C
. ...Hologram, 3...Light source, 3a.
...Illumination light for reproduction, 3b...Diffraction light, 4
...Photoelectric element, 6...Shutter, 7.
...Opening/closing control means, 8...Liquid crystal shutter
'Ivy, 9 a19 b, 9 c...window,
11...Public telephone housing, 12...Insertion slot, 13...Reflecting mirror, 14...Transport device, 15...Hologram destruction device, 21...
...shading belt, 22 ... hole, 23 ...
... Rotating wheel, 24 ... Outer frame, 25 ...
・Axis, 26a, 26b...Step motor, 2
7... Protrusion, 28... Locking hole, 29.
...Rotating wheel, 3o...hole, 31 town...shading belt, 32...protrusion, 33...locking hole, 34... ·hole. Patent applicant: Makoto Nakajima, Anritsu Electric Co., Ltd. Agent: Makoto Hayakawa, patent attorney Figure 1 Figure 4 51 yen! Figure 6 1 Figure 7 (a) -1"

Claims (2)

[Claims] (1) A light source that emits a reference beam, an optical system that irradiates the light beam from the light source onto a hologram recording plate on which a plurality of holograms are arranged, and a photoelectric system that converts the diffracted light from the hologram recording plate into an electrical signal. In the hologram reproducing device, a shutter having a plurality of windows that opens and closes facing each hologram is disposed near the hologram recording root, and the light beam passing through the optical system is directed to the entire surface of the shutter or to the hologram recording plate. It is characterized by providing an opening/closing control means for illuminating the entire surface and opening a window facing the desired hologram, so that only the hologram corresponding to the window opened by the opening/closing control means is selectively reproduced. A hologram reproduction device. (2) The shutter has an electrode corresponding to each window opening, and comprises a liquid crystal body that optically opens the corresponding window when a voltage is applied from the opening/closing control means. The hologram reproduction device according to scope 1.