JPS5823335A - Recording element - Google Patents

Abstract

PURPOSE:To obtain a new element possible for recording even with a laser light source of a small output, by storing and heat-treating a plate made of a shape memory effect storage alloy, processing the plate into a thinner plate, irradiating thermal energy rays to the plate locally and forming deformed parts. CONSTITUTION:After storing and heat-treating a plate made of a shape memory effect storage alloy, the plate is processed into a thinner plate 5. Laser rays from a laser gun 4 are irradiated to this thin plate 5 to cause local heating, then this heated part tends to return to the original thickness, wen-shaped deformation 6 is produced. For example, through the use of this principle, the laser gun 4 is moved along the plate 5, laser rays are irradiated as required and a recording pattern consisting of a lot of deformed parts 6 on the plate 5. The recorded information is read with a reader consisting, for example, of a lamp 7 and an optical sensor 8.

Description

[Detailed description of the invention] The present invention relates to a digital recording element.

Conventionally, there was a device shown in Fig. 1 as a rice cultivation device. In the figure, (II is a metal plate, (2rld metal plate surface mK
This is a sensor that detects the presence or absence of holes (3Hj) drilled with a laser beam.When the sensor is moved at a constant speed along a metal plate in the direction of the holes, a pulse signal corresponding to the hole arrangement is generated. is detected. Conventional digital recording elements require a high-output laser light source to make holes in a metal plate.

The purpose of this invention is to provide a new recording element capable of recording even with a low-output laser light source.

Here, the shape memory alloy (Shape
Memory A11ays) 8 M A 4C/
) and will be explained with reference to FIG. This alloy realizes the shape A that you want to memorize in a high temperature range above the high temperature side critical temperature Tf, cools it to below the low temperature side critical temperature T8 unique to the alloy, and then bends it in the low temperature area. After applying plastic deformation (deformation exceeding the elastic limit) such as twisting and thickness,
When heated slightly above the critical temperature (1 (1 to 30℃), it returns to its original shape A.This phenomenon is caused by shape memory, as it appears as if the 1 alloy die remembers its shape in the high temperature range. It is called effect (SME).

Alloys that exhibit this behavior are called SMAs.

In addition to shape A in the high temperature range, shape C in the low temperature range
It is also possible to memorize data at the same time.

In this case, in particular, the aT inverse shape memory effect (R, S, M,
It is sometimes called K).

If we look at this effect from a phenomenon perspective, it means that the shape of an SMA object changes in response to changes in the surrounding temperature, but when we compare this effect with the case of bimetallic materials, we find that
The characteristics of the shape change of the mu are even more apparent. As can be seen in Table 1.

In the case of 8M, the temperature range in which shape changes occur is limited, but (a) the amount of deformation with respect to temperature changes is large;
b) A major feature is that the force generated by deformation is large.

Further, Table 2 shows examples of alloys in which such 8 MIC is observed.

Table 1. Characteristics of Shape Change (Comparison with Bimetals) Table 2 Composition and Temperature Properties of Various Shape Memory Alloys Below, an embodiment of the present invention using the above-mentioned shape memory alloy will be described. In Figure 3.

(5) d Shape memory alloy thin plate (4112) This is a laser gun as a heating source for locally deforming the shape memory alloy plate.Shape memory alloy is a shape memory alloy that has a shape memorized in advance. Ba.

The shape memory alloy plate (5) is a new alloy that has the property of returning to its original shape by heating or cooling even if it is plastically deformed. It is made into a thin plate and has the property of returning to its original thickness when heated. Now, when this shape memory alloy plate is irradiated with a laser beam from a laser gun (4) for a short period of time, the irradiated area (5a) will be 9 localized to the original thick plate as shown in the enlarged figure 4. A hump-shaped deformed portion (6) is generated as the thickness tries to return to normal.The laser gun (41 is moved along the plate).

By irradiating the laser beam as necessary, a large number of deformed parts (6) are formed on the board, making it possible to create a brass pattern.
This pattern becomes digital storage information. In this way, the information stored on the alloy plate (5i) is

The reading is performed by a reading device composed of a lamp (71) and an optical sensor (81) shown in FIG.

That is, light from the lamp (7) is irradiated onto the first alloy plate (5).

For example, the intensity of the reflected light is detected by an optical sensor (61) such as a phototransistor, and information is read.

In addition, the shape memory alloy plate can be made thinner if necessary.
Since there is no need to make holes as in the conventional method, the output of the laser gun can be reduced, and an inexpensive recording element can be provided. Also.

In the detailed description of the present invention, a laser beam is used. However, any energy beam such as infrared rays that irradiates concentrated heat energy only to extreme areas may be used.

According to the invention as described above, digital information can be stored without making holes in a metal plate.

[Brief explanation of drawings]

Figure 1 is a bird's-eye view of a conventional digital recording element;
The figure is an explanatory diagram for explaining shape memory alloy, Figure 3 is a bird's-eye view showing the state of digital recording according to an embodiment of the present invention, Figure 4 is a partially enlarged view of Figure 2, and Figure 5 is a reading diagram. It is a principle diagram of the device. In the figure, (1) is a metal plate, (21 is a hole, (3) is a sensor,
(41-piece laser gun, part) is a shape memory alloy plate, (ali
j is the deformed part. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 111-Wa@35I 4141!1 Da 5th WJ

Claims (1)

[Claims] After a shape memory alloy plate is subjected to memory heat treatment. The recording element is further processed into a thin plate and heated locally and instantaneously using thermal energy I such as a laser beam or infrared rays to form a deformed portion in one local area.