阅读说明：本技术 绘制方法和擦除方法 (Drawing method and erasing method ) 是由 栗原研一 竹内太一 星光成 平井畅一 于 2019-10-08 设计创作，主要内容包括：在根据本公开内容的实施方式的绘制方法中,当在记录层上方设置有面内具有凹凸形状的透光构件的热记录介质上进行绘制时,在所述透光构件上设置具有一个表面和另一个表面的光学补偿器,使得所述一个表面与透光构件彼此面对,并且经由光学补偿器向热记录介质照射激光束。光学补偿器的所述一个表面的形状与透光构件的凹凸形状相吻合,所述另一个表面是平坦的且面对所述一个表面。(In the drawing method according to the embodiment of the present disclosure, when drawing is performed on a thermal recording medium in which a light-transmitting member having an in-plane concave-convex shape is provided above a recording layer, an optical compensator having one surface and the other surface is provided on the light-transmitting member so that the one surface and the light-transmitting member face each other, and a laser beam is irradiated to the thermal recording medium via the optical compensator. The one surface of the optical compensator is shaped to conform to the concave-convex shape of the light-transmitting member, and the other surface is flat and faces the one surface.)

1. A drawing method used when drawing is performed on a thermal recording medium provided with a light-transmitting member having an in-plane concave-convex shape above a recording layer, the drawing method comprising:

providing an optical compensator having one surface and the other surface on the light-transmitting member so that the one surface and the light-transmitting member face each other, the one surface having a shape conforming to a concavo-convex shape of the light-transmitting member, and the other surface being flat and facing the one surface; and

irradiating the thermal recording medium with a laser beam via the optical compensator.

2. The drawing method according to claim 1, wherein the optical compensator is removed after irradiating the laser beam.

3. The drawing method according to claim 1, wherein an optical compensator whose difference from the refractive index of the light-transmitting member is not less than 0 and not more than 0.1 is used.

4. The drawing method according to claim 1, wherein an optical correction jig having a pattern opposite to the concavo-convex shape of the light-transmitting member on the one surface is used as the optical compensator.

5. The rendering method of claim 1, wherein a gel is used as the optical compensator.

6. The rendering method of claim 1, wherein a solvent is used as the optical compensator.

7. The drawing method according to claim 6, wherein the thermal recording medium is immersed in the solvent, thereby forming the optical compensator composed of the solvent on the thermal recording medium.

8. The drawing method according to claim 1, wherein a curable resin is used as the optical compensator, and the resin in a liquid state is cured after being applied onto the thermal recording medium, thereby forming the optical compensator.

9. The rendering method of claim 8, wherein the optical compensator is removed after rendering.

10. The rendering method according to claim 1, wherein

The recording layer contains a color forming compound having an electron donating property, a color developing agent having an electron accepting property, a photothermal conversion agent and a polymer material, and

drawing is performed on the recording layer by irradiation of the laser beam.

11. An erasing method used when erasing an image from a thermal recording medium provided with a light transmitting member having a concave-convex shape in its plane above a recording layer, the erasing method comprising:

providing an optical compensator having one surface and the other surface on the light-transmitting member so that the one surface and the light-transmitting member face each other, the one surface having a shape conforming to a concavo-convex shape of the light-transmitting member, and the other surface being flat and facing the one surface; and

irradiating the thermal recording medium with a laser beam via the optical compensator.

12. The erasing method of claim 11, wherein

The recording layer contains a color forming compound having electron donating property, a color developing/decolorizing agent having electron accepting property, a photothermal conversion agent and a polymer material, and

erasing an image drawn on the recording layer by irradiation of the laser beam.

Technical Field

The present disclosure relates to a drawing method and an erasing method performed on, for example, a thermal recording medium having a surface with a concavo-convex shape.

Background

In recent years, as the demand for customization by customers has been increasing, development of a thermal recording technique in which drawing is performed using a laser is promoted as one of so-called non-contact decoration-on-demand techniques. For example, unlike a contact recording method using a thermal head, a thermal recording technique using a laser allows non-contact recording, thus making it possible to perform writing (drawing) of information without including a thermal recording layer on the outermost surface.

As a drawing apparatus that performs drawing using laser light, for example, PTL1 discloses a recording apparatus including a laser beam oscillator, a scanner, a modulator, and a lens system. The laser beam oscillator irradiates a reversible multicolor recording medium with a plurality of laser beams each having a different wavelength, the reversible multicolor recording medium including a plurality of reversible thermochromic compositions each having a different developed color tone. The scanner scans the surface of the reversible multicolor recording medium with a laser beam. The modulator selectively modulates the output of the laser beam in association with the scanning position and the recording information. The lens system causes a plurality of laser beams each having a different wavelength to enter the optical deflector from different directions.

Reference list

Patent document

Patent document 1: japanese unexamined patent application publication No. 2004-

Disclosure of Invention

Further, in the thermal recording medium for decoration, the surface decoration member provided on the thermal recording layer does not necessarily have a uniform thickness. For example, it is assumed that the surface modifying member has a geometric sectional shape. In this case, refraction of the laser beam or change in beam diameter or the like occurs at the surface of the surface decorative member, which easily causes distortion of the drawn image or drawing unevenness, resulting in deterioration of display quality. When used for decoration, the degradation of display quality seriously impairs the product value.

Therefore, it is desirable to provide a drawing method and an erasing method that can improve display quality.

In the drawing method according to the embodiment of the present disclosure, when drawing is performed on a thermal recording medium in which a light-transmitting member having an in-plane concave-convex shape is provided above a recording layer, an optical compensator having one surface and the other surface is provided on the light-transmitting member so that the one surface and the light-transmitting member face each other, and a laser beam is irradiated to the thermal recording medium via the optical compensator. The one surface of the optical compensator is shaped to conform to the concave-convex shape of the light-transmitting member, and the other surface is flat and faces the one surface.

In the erasing method according to the embodiment of the present disclosure, when the thermal recording medium provided with the light transmitting member having the in-plane concave-convex shape over the recording layer erases an image, the optical compensator having one surface and the other surface is provided on the light transmitting member so that the one surface and the light transmitting member face each other, and the laser beam is irradiated to the thermal recording medium via the optical compensator. The one surface of the optical compensator is shaped to conform to the concave-convex shape of the light-transmitting member, and the other surface is flat and faces the one surface.

In the drawing method and the erasing method according to the embodiment of the present disclosure, an optical compensator having one surface and the other surface is provided on the light-transmitting member so that the one surface and the light-transmitting member face each other, and the laser beam is emitted via the optical compensator. The one surface of the optical compensator is shaped to conform to the concave-convex shape of the light-transmitting member, and the other surface is flat and faces the one surface. This allows the emitted laser beam to reach the recording layer without being refracted.

Drawings

Fig. 1 is a schematic cross-sectional view illustrating a drawing method and an erasing method performed on a thermal recording medium according to a first embodiment of the present disclosure.

Fig. 2 illustrates an example of a process of irradiating the thermal recording medium according to the first embodiment of the present disclosure with a laser beam.

Fig. 3 is a schematic sectional view showing a configuration example of the thermal recording medium shown in fig. 1.

Fig. 4 shows an example of a system configuration of the drawing and erasing apparatus.

Fig. 5 depicts the refraction of the laser beam at the concave-convex surface.

Fig. 6 is a characteristic diagram showing a relationship between the thickness of the surface decorative member and the amount of axial deviation of the laser beam.

Fig. 7 shows drawing positions when a laser beam is irradiated on a general thermal recording medium having a surface decorative member with a flat surface on the surface.

Fig. 8 is a schematic diagram of a microlens array.

Fig. 9 shows drawing positions when a thermal recording medium including a surface decorative member having a concave-convex surface on a surface is irradiated with a laser beam.

Fig. 10 shows spot positions in the case where a glass substrate having a flat surface is irradiated with a light beam.

Fig. 11 is a perspective view (a) and a schematic sectional view (B) showing the configuration of the microlens.

Fig. 12 shows spot positions in the case where the microlens shown in fig. 11 is irradiated with a light beam.

Fig. 13 is a schematic cross-sectional view illustrating a drawing method and an erasing method performed on a thermal recording medium according to a second embodiment of the present disclosure.

Fig. 14 is a schematic sectional view showing a configuration example of a thermal recording medium according to a modification of the present disclosure.

Fig. 15 is a perspective view showing an example of an appearance of application example 1.

Fig. 16A is a perspective view showing an example of the external appearance (front side) of application example 2.

Fig. 16B is a perspective view showing an example of the external appearance (back side) of application example 2.

Fig. 17A is a perspective view showing an example of the external appearance (upper surface) of application example 3.

Fig. 17B is a perspective view showing an example of the appearance (side surface) of application example 3.

Fig. 18 is a perspective view showing an example of application example 4.

Fig. 19 is a diagram showing a configuration example of application example 5.

Fig. 20 is a sectional view describing the shape of the optical correction jig used in the test example.

Detailed Description

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following description is merely specific examples of the present disclosure, and the present disclosure is not limited to the following embodiments. In addition, the present disclosure is not limited to the position, size, proportion, and the like of each component illustrated in each drawing. Note that the description is made in the following order.

1. First embodiment (example of drawing method and erasing method in which an optical compensator is provided on a light-transmitting member and a laser beam is emitted via the optical compensator)

1-1. arrangement of thermal recording Medium

1-2. method for producing thermal recording medium

1-3. configuration of drawing and erasing apparatus

1-4. drawing method and erasing method

1-5. work and Effect

2. Second embodiment (example of a drawing method and an erasing method in which a thermal recording medium is immersed in a solvent and irradiated with a laser beam through the solvent)

3. Modification (example of thermal recording Medium including recording layer having surface with curvature)

4. Application example