JPH0128430B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hologram card reading/destroying device that reads holograms from a hologram card in which a plurality of holograms are arranged and destroys the read holograms.

As is well known, a hologram records interference fringes between a reference beam and an object beam (signal beam modulated with written information) on a hologram recording dry plate. It has been proposed to use a hologram card with holograms written on it as a public phone card, or as a bank card with information such as deposits written on it as a hologram. For example, when used as a usage card for a public telephone, 50 identical holograms recording information about the number of calls per call can be used for 50 times, for example, are arranged in a straight line at equal intervals. However, when using holograms in such fields, it is especially necessary to ensure that there are no errors in reading the holograms in order to prevent fraud using counterfeit cards. When using the hologram as call frequency information or as other useful information, it is necessary to immediately destroy the hologram after it has been read. For example, in the case of a public telephone card with a large number of holograms of 1 degree arranged, each time a hologram of 1 degree is read and a call can be made 1 time, the 1 hologram of 1 degree that was read is later fraudulently used. It is necessary to destroy it immediately so that it cannot be reused.

The present invention has been made in view of the above, and an object of the present invention is to provide a hologram card reading/destroying device that reliably reads a hologram and destroys the read hologram.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the invention.

In the same figure, 11 is a hologram card, and this hologram card 11 has a plurality of holograms 12a, 12b, 12 as shown in FIG.
c, . . . are arranged in a straight line. These holograms 12a, 12b, 12c, . . . are all created using the same signal light and reference light, and record the same value information, for example, information representing 1 degree in the case of a public telephone card. .

Illumination light 1 for reproduction is placed on this hologram card 11.
As shown in FIG. 1, the optical system for irradiating the light 3a includes a light source 14 that emits well-coherent light such as a laser beam, and a lens 1 that magnifies this light beam.
5, 16, a first prism 17 that causes the light flux that has passed through the lens 16 to proceed in a direction parallel to the surface of the hologram card 11, and a second prism 18 that causes the light flux that has passed through the first prism 17 to proceed to the hologram card 11. It is composed of:

The second prism 18 is incorporated into a unit 22 that maintains a fixed positional relationship with each other along with a direct reflection light detector 19, a hologram detector 20, and a hologram destroyer 21, which will be described later.This unit 22 is connected to a drive device 23. Yotsute hologram card 1
It is adapted to be moved in a direction parallel to one surface. Therefore, as the unit 22 is moved by the drive device 23, the second prism 18 moves parallel to the surface of the hologram card 11, so that the reproduction illumination light 13a is irradiated onto the surface of the hologram card 11 in accordance with this movement. The positions are holograms 12a, 12b, 12 of the hologram card 11 shown in FIG.
c, ... move along the arrangement direction. During this movement, since the installation angle of the second prism 18 remains unchanged, the angle of incidence of the reproduction illumination light 13a on the surface of the hologram card 11 is always constant.

Hologram 12a on hologram card 11,
When the reproduction illumination light 13a from the second prism 18 is irradiated onto 12b, 12c, . It produces light 13c. The directly reflected light detector 19 is mounted on the unit 21 so as to be located on the optical path of the directly reflected light 13b, and the hologram detector 20 is located on the optical path of the diffracted light 13c. The direct reflection photodetector 19 is composed of a photoelectric element, such as a phototransistor, that converts an optical signal into an electrical signal.

The hologram detector 20 detects hologram information using diffracted light 13c from a hologram. For example, in the case of a hologram that connects a plurality of light spots, a photoelectric element that can detect each light spot may be used.

The output of the direct reflection light detector 19 and the output of the hologram detector 20 are connected to a determination circuit 25 for determining whether a regular hologram is recorded by logical product of both.

The hologram destroyer 21 is for destroying the hologram recorded at the scanning position of the reproduction illumination light 13a.
is composed of a thermoelectric element 21a and a driving section 21b,
It is attached to the unit 22 so as to be located above the irradiation position of the hologram card 11 to which the reproduction illumination light 13a is irradiated, and to be movable in a direction perpendicular to the hologram card 11.
For this reason, the hologram destroyer 21 is
Since the hologram card 11 moves in a direction parallel to the surface of the hologram card 11, it is always located above the hologram that is currently being read, and this hologram is
When the hologram is read by the hologram 5 and determined to be a regular hologram, the hologram moves toward the hologram card 11 according to a command from the determination circuit 25, and by contacting or approaching the surface of the hologram card 11, the hologram is The hologram on the surface of the card 11 is destroyed by heat.

Next, the operation of the above hologram card reading/destroying device will be explained.

The light beam emitted from the light source 14 passes through the lens 15,
16, the light beam is expanded and passes through the first prism 1.
7 in a direction parallel to the surface of the hologram card 11, and is irradiated onto the surface of the hologram card 11 by the second prism 18.

When a hologram exists at the irradiation position of the hologram card 11, the directly reflected light 13b and the diffracted light 13
The directly reflected light 13b is detected by the direct reflected light detector 19, and the hologram information is detected from the diffracted light 13c by the hologram detector 20. Therefore, judgment circuit 2 takes the AND of both outputs.
5, it is determined that a hologram is recorded.

When there is no hologram at the irradiation position, directly reflected light 13b is generated, but diffracted light 13c is not generated. Therefore, the determination circuit 25 determines that no hologram is recorded. Furthermore, even if a hologram exists, if it is not a regular hologram used on the card, the diffracted light will be generated in a direction different from that of the hologram detector 20, so the determination circuit 24 will make an erroneous determination. do not have.

If the determination circuit 25 determines that a regular hologram is placed, the unit 22 remains motionless.
Depending on the output of the determination circuit 25, the hologram destroyer 2
The thermoelectric element 21a approaches the surface of the hologram card 11 and destroys the hologram that has actually been read as a regular hologram, and the hologram destroyer 21 returns to its original position again. For example, in the case of a public telephone card, 1
If one hologram is determined to be a regular hologram (that is, regular 1 degree information),
When it becomes possible to make a call, it is immediately destroyed to prevent it from being illegally reused later.

When the above-mentioned hologram card reading/destruction operation is completed, the unit 22, that is, the second prism 18, the direct reflection light detector 19,
The hologram detector 20, lens 24, and hologram destroyer 21 are moved to scan the reproduction illumination light 13a over the hologram card 11 while performing similar reading and destruction operations one after another. Therefore, in the case of a public telephone card, for example, each time the hologram is used for one call, the next hologram is read and read, and after being read, the card is destroyed in the same way.

Note that when a hologram is determined at a certain scanning position in this way, the hologram is destroyed at that position, so there is no need to move the card or move the optical system unit 22 for destruction. This saves time in card processing, and eliminates the possibility that the card may be returned in some fraudulent manner during transportation for destruction and one hologram that has already been used may be fraudulently reused.

Note that by scratching or attaching foreign matter to a pseudo card that is not a regular hologram card, the reflected light of the reproduction illumination light 13a is received by the hologram detector 20, and this is detected as the same as the regular hologram information. Even if the direct reflected light detector 1
9 does not receive light, so no erroneous determination occurs.

Note that when external light enters from a direction different from the reproduction illumination light 13a and the reflected light enters the hologram detector 20 and is detected as regular hologram information, the direct reflection light detector 19 Since it is not detected, no false positives occur.

Note that instead of configuring the hologram destroyer 21 with a thermoelectric element, it may be configured with a punching means for making a hole in the hologram card 11.

FIG. 3 shows the configuration of an embodiment of a hologram card reading/destroying device in which, after the hologram is destroyed by the hologram destroyer 21, movement of the unit 22 by the driving device 23 is stopped until the destruction of the hologram is confirmed. ing.

In the figure, 26 is a driving device 26 until destruction of the hologram is confirmed by the output of the determination circuit 25.
This is a control device that stops the drive of the drive device 23 and starts the drive of the drive device 23 when destruction of the hologram is confirmed.

As explained above, in the hologram card reading/destroying device according to the present invention, it is determined whether or not a hologram is recorded depending on whether both directly reflected light and diffracted light are detected simultaneously. , it is possible to prevent erroneous judgments, and it is possible to prevent fraud using fake cards with scratches on plate-shaped objects or foreign objects attached. Furthermore, the hologram is destroyed immediately after it has been read without moving the card, which is extremely useful when the hologram is used for useful information such as information on the number of times a public telephone is used. , there is no risk of accidentally destroying holograms in other positions, and cards can be operated accurately.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the hologram card reading/destroying device of the present invention, FIG. 2 is a plan view of the hologram card, and FIG. 3 is an embodiment of another hologram card reading/destroying device of the present invention. FIG. 2 is a schematic diagram illustrating an example. 11... Hologram card, 12a, 12b,
12c...Hologram, 13a...Illumination light for reproduction, 13b...Directly reflected light, 13c...Diffracted light,
14...Light source, 15, 16...Lens, 17...
First prism, 18...Second prism, 19
... Direct reflection light detector, 20 ... Hologram detector, 21 ... Hologram destroyer, 21a ... Thermoelectric element, 21b ... Drive section, 22 ... Unit, 2
3... Drive device, 24... Lens, 25... Judgment circuit, 26... Control device.

Claims (1)

[Claims] 1. Reproduction illumination light is incident at a constant angle onto the surface of a hologram card on which a plurality of holograms on which the same value information is recorded are arranged at intervals, and the surface of the hologram card is directed in the direction in which the holograms are arranged. an optical system that scans light to the hologram card; a direct reflection light detector that is movable parallel to the surface of the hologram card and detects light directly reflected from the surface; and a hologram detector provided at a position where it can detect hologram information by receiving diffracted light generated from a regular hologram on the surface of the hologram card, and a hologram detector arranged parallel to the surface of the hologram card in synchronization with the optical scanning. a driving device for moving the hologram to a scanning position; and a drive device for detecting that a regular hologram is recorded at a scanning position when the hologram detector detects regular hologram information when a detection output is output from the direct reflection light detector. A determination circuit that determines a regular hologram, and a destroyer that starts an operation to destroy the determined hologram at the same scanning position as the determined hologram when the determination circuit determines that the determined hologram is a regular hologram. A device for reading and destroying hologram cards. 2. An optical system that makes reproduction illumination light incident at a constant angle on the surface of a hologram card on which a plurality of holograms on which information of the same value is recorded is arranged at intervals, and optically scans the surface of the hologram card in the direction in which the holograms are arranged. a direct reflection light detector that is movable parallel to the surface of the hologram card and detects direct reflection light from the surface; and a direct reflection light detector that is in a fixed positional relationship with respect to the direct reflection light detector and that a hologram detector provided at a position where it can receive diffracted light generated from a regular hologram and detect hologram information; and a drive device that moves both of the detectors parallel to the surface of the hologram card in synchronization with the optical scanning. , a determination circuit that determines that a regular hologram is recorded at a scanning position when the hologram detector detects regular hologram information when a detection output is output from the direct reflection light detector; When the determination circuit determines that the hologram is a regular hologram, a destroyer starts an operation to destroy the determined hologram at the same scanning position as the determination circuit, and the destroyer is activated. and a control device that stops the optical scanning until the destruction is confirmed by the output of the determination device.