JPH0411539A - Decoration article - Google Patents

Abstract

PURPOSE:To develop a plurality of patterns having different colors through the very simple operation by dispersing plural kinds of irreversible thermochromic substances which have different color change temperatures and the color phases in color change in a base member and heating a plurality of regions on the base member at different temperatures. CONSTITUTION:The focus of the laser beam L1 is adjusted to the position where a pattern 7 is to be developed on a base member 2 made of transparent resin in which the first and second thermochromic substances 5 and 6 are dispersed, and irradiation is carried out. Through this irradiation, the temperature of each substance 5, 6 at the irradiation position is raised in an extremely short time. The output of the laser beam L1 at this time is adjusted, and only the substance 5 color-changes at the irradiation part. Then, a pattern 7 is formed in the mixture of the color of the substance 5 and the color of the substance 6 in the color change part. The focus of the laser beam L2 is adjusted to the position where a pattern 8 is to be developed, and irradiation is carried out. The output of the laser beam L2 at this time is adjusted, and the substance 5 color-changes at the irradiation part, and the substance 6 color-changes. Accordingly, a pattern 8 is formed in the mixture of the color of the substance 5 and the color of the substance 6 in the color change part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a decorative item such as a garnish that is attached to the rear of an automobile to display letters or the like in a decorative manner.

``Prior Art'' Conventionally, for example, rear garnishes attached to the rear of a car have been made by painting the outer or inner surface of a base material made of transparent resin to produce a logo indicating the vehicle name, grade name, etc.
Some have patterns such as pictures attached.

[Problems to be Solved by the Invention] However, the above-mentioned coating with a pattern or garnish has been commonly used for a long time, and lacks freshness in terms of design. Therefore, there is a desire to develop a new decorative item with a pattern that is superior in appearance.

Furthermore, in order to apply a pattern by painting, it is necessary to perform masking, and it is particularly troublesome to apply various types of patterns with different colors.

An object of the present invention is to provide a decorative article that is novel and has an excellent appearance, and that allows a plurality of patterns of different colors to appear with a very simple operation.

[Means for Solving the Problems] Therefore, in order to achieve the above object, the present invention provides a method in which a plurality of types of irreversible thermochromic substances having different color change temperatures and hues at the time of color change are dispersed in a base material, and the base material The gist of the decorative article is that a plurality of regions are heated to different temperatures, and only the thermochromic material that exceeds the color change temperature in each region selectively changes color to reveal a pattern of different hues.

The phenomenon of discoloration of the irreversible thermochromic material is thought to be due to changes in the composition of the thermochromic material itself due to thermal decomposition accompanied by the generation of ammonia, carbon dioxide, water, and the like.

Examples of such irreversible thermochromic substances include the following metal compounds.

When these metal compounds exceed the discoloration temperature by heating, they change color as shown by (color at low temperature) → (color at high temperature).

・C0I2-2(CH2)6N4-8820・・・・・・
・Brown pink → green (color change temperature 50°C) ・NiBr2-2
(CH2)sN49H20...Green→Blue (color change temperature 62℃)・Co(CH3COO)t-4HzO・・・Pink-purple (colorchange temperature 82℃)・Co(N
C3)2-2(C6H5N)-10820...
Purple → Blue (color change temperature 93°C), Co51Fs ... Orange pink → bright pink (color change temperature 99°C), C
o(HCO3)z-2HzO ・・・・・・Pink→Deep purple (color change temperature 116°C)・[
Cr(NHzCHzCHJHz)alC1a(1)...
...Yellow → Red (color change temperature 119°C)' [Cr(N
H2CHzCH,NH2)al(NC3)3(1)...
...Yellow → Red (color change temperature 121'c), NH, VO
3 (I) ...White → Pink (color change temperature 132°C)・NH
4VO3(II) ・・・・・・Pink → Black (color change temperature 162°C)・[C
r(NHzCH2CHJH2)al(NC3)3(II
)... Red → Black (color change temperature 252°C)" [
Cr(NH, CH2CHzNH2)3]C1, (II
)... Red → Black (color change temperature 270℃) It takes on a different color. The thermochromic substance at this time may be dispersed in the base material itself, or may be blended into the paint applied to the base material. Then, when a part of the base material is heated to a predetermined temperature, the thermochromic material that exceeds the color change temperature in the irradiated area changes color to a predetermined color. Also, when another region is heated to a temperature different from the above temperature, the other thermochromic material in that irradiated region will change color to a different color beyond the color change temperature.

Therefore, it is possible to make a plurality of patterns of different colors appear on the base material. Since these thermochromic materials are irreversible, once they have changed color, they do not return to their original color even if the temperature drops, and each pattern continues to maintain its predetermined color.

The color tone of each patterned portion and the other portions is obtained by the thermochromic substance dispersed in the base material, and is therefore different from the color tone obtained by painting.

Further, the heating method mentioned above includes laser light, infrared ray irradiation, hot pressing, etc., and a pattern can be created by such a simple operation.

[Example] Hereinafter, an example in which the present invention is embodied in a rear garnish attached to the rear end of an automobile will be described with reference to the drawings.

As shown in FIGS. 1 and 3, the base material 2 of the rear garnish l of this embodiment is formed into an oblong plate shape from a synthetic resin material so as to be installed between the left and right rear combination lamps 4 at the rear of the automobile 3. has been done. The synthetic resin materials constituting the base material 2 include PMMA (polymethyl methacrylate), PC (polycarbonate), and PS.
There are transparent synthetic resins such as (polystyrene), PU (polyurethane), and epoxy, and liquid ones can also be used at the raw material stage. Here, transparent means not only colorless and transparent, but also
In addition, it includes colored transparent and semi-transparent.

Furthermore, two types of irreversible thermochromic substances are almost uniformly dispersed in the base material 2 at all locations. In this example, Ni
Br2-2(CHz)sN49H20 (hereinafter referred to as the first thermochromic substance 5) and [Cr(NH2CH2
CH2NH2)3](NC3)3(I) (Hereinafter, the second
A thermochromic substance 6) was used. The first thermochromic substance 5 is green at low temperatures, but turns blue when heated above the discoloration temperature (62°C), and the second thermochromic substance 6 is yellow at low temperatures, but at the discoloration temperature (121°C). It turns red when heated above 30°F (°C). Furthermore, both substances 5 and 6 have the property that once they change color, they do not return to their original state.

As mentioned above, both thermochromic substances5,6 at low temperatures
Since the colors are green and yellow, the transparent base material 2 has a yellow-green color. Then, mutually different regions of both thermochromic materials 5 and 6 are colored blue and red respectively by irradiation with laser beams Ll and L2, which will be described later, and the colored portions are used as first and second patterns 7.8 on the automobile 3. It can be seen through the base material 2 from behind. Examples of the first and second patterns 7.8 include logos such as car names, great names, patterns, and the like.

Next, a method of producing the patterns 7 and 8 in the jersey 1 constructed as described above will be explained with reference to FIG. 1.2.

In this example, laser light was used to create the patterns 7 and 8. Laser light is a light beam with extremely high energy density, and when it is irradiated onto the surface of a material, it has the ability to heat the surface in an extremely short time. Furthermore, by using an optical system such as a lens, the laser beam can be irradiated into the workpiece in a converged state, so that the complex pattern 7 can be easily created inside the workpiece. There are three types of lasers: gas lasers, liquid lasers, and solid-state lasers.
In this example, a solid-state laser (Nd-YAG laser) that can obtain high output and is a compact device was used.

First, prior to irradiation with this laser beam, first and second thermochromic materials 5 and 6 are prepared as shown in FIG.
A transparent resin base material 2 in which is dispersed is prepared, and this is attached to a predetermined position at the rear of an automobile 3. Next, Nd-YAG
A laser processing machine is set near the base material 2, and the laser beam L is applied to the region on the base material 2 where the first pattern 7 is desired to appear.
Focus and irradiate.

As described above, when the laser beam L1 is irradiated toward the base material 2, the laser beam L1 passes through the transparent base material 2 and passes through the first
and the second thermochromic material 5.6.

This irradiation increases the temperature of the thermochromic material 5.6 at the irradiated site in a very short time. Since the output of the laser beam L1 at this time is adjusted so that the heating temperature is approximately 80° C., only the first thermochromic material 5 changes color from green to blue in the irradiated portion.

As a result, the discolored area becomes greenish due to the mixture of the blue of the first thermochromic substance 5 and the yellow of the second thermochromic substance 6, and the discolored area at this time becomes the desired first pattern 7. .

Next, the laser beam L2 is focused and irradiated onto a region on the base material 2 where the second pattern 8 is desired to appear. Since the output of the laser beam L2 at this time is adjusted so that the heating temperature is approximately 130°C, the first thermochromic substance 5 changes color from green to blue in the irradiated area, and the second thermochromic substance 5 changes color from green to blue.
The thermochromic substance 6 changes color from yellow to red.

As a result, the discolored area becomes purple due to the mixture of the blue color of the first thermochromic substance 5 and the red color of the second thermochromic substance 6, and the discolored area becomes the desired second pattern 8. .

In this way, the first and second patterns 7 and 8 appear.According to Jaganish L., in the daytime, the first pattern 7 appears green on the yellow-green substrate 2, and the second pattern 7 appears green.
Pattern 8 appears purple.

These color tones are obtained by the thermochromic substances 5 and 6 dispersed in the coating layer 5, and are therefore different from the color tones obtained by painting.

Further, as described above, two types of patterns 7 and 8 having a predetermined shape are revealed by the simple operation of irradiating the laser beams LL and L2, and moreover, with the base material 2 still attached to the rear of the automobile 3. With this, patterns 7 and 8 can appear.

Furthermore, the laser beam L1. Since the pattern is revealed by L2, there is no risk that the parting line S between the painted part and the unpainted part will become unclear when removing the masking, unlike when a pattern is applied by painting, and it is also possible to create a pattern with a complex shape. It becomes possible to make patterns 7 and 8 appear.

In this way, in the liquid garnish of this embodiment, a plurality of types of irreversible thermochromic substances 5 and 6 having different color change temperatures and hues at the time of color change are dispersed in the transparent base material 2, and the A plurality of regions of the transparent base material 2 are heated to different temperatures, and only the thermochromic substances 5 and 6 exceeding the discoloration temperature in each region are selectively discolored to reveal patterns 7 and 8 of different hues. .

Therefore, two types of patterns 7 and 8 can be made to appear by the very simple operation of irradiating laser beams Ll and L2, creating a new and unique color tone that is different from conventional rear garnishes with patterns applied by painting. can be realized.

Also, in order to create a pattern with the laser beams LL and L2, the pattern 7
, 8 and their surroundings can be made very clear, and it is also possible to create a pattern 7°8 with a complicated shape.

It should be noted that the present invention is not limited to the structure of the above-mentioned embodiment. For example, in the above-mentioned embodiment, the present invention was embodied in a rear garnish for a car 3, but it could also be embodied in accessories for bites, bicycles, nameplates, information boards, etc. may be converted into Further, the base material 2 may be formed into a flexible sheet shape, and in this case, the base material 2 is made of polyolefin, polystyrene, polyurethane, etc.
At this time, a thermochromic substance 5 is placed in the base material 2.
, 6 may be distributed.

Further, in the above embodiment, the two types of patterns 7 and 8 appear separated from each other, but it is also possible to arrange one pattern within the other pattern. Hereinafter, the method of appearance will be explained. First, as shown in FIG. 4, laser light Ll is irradiated over a wide area to change the color of only the first thermochromic substance 5 to reveal the blue first pattern 7. let Next, as shown in FIG. 5, when the laser beam L2 is irradiated in a narrow range toward the center of the first pattern 7, the second thermochromic material 6 changes color to red, as shown in FIG. A purple second pattern is placed in the center of the first pattern 7.
Pattern 8 can be made to appear.

Furthermore, in the above embodiment, the first and second thermochromic substances 5 and 6 were dispersed in the base material 2 itself, but for example, as shown in FIG. 7, both thermochromic substances 5 and 6 were blended. A paint is applied to the base material 2, and a laser beam L1. Patterns 7 and 8 of different hues by irradiating L2
may appear.

On the other hand, in the above embodiment, two types of thermochromic substances 5 and 6 having different color change temperatures and different hues at the time of color change are dispersed in the base material 2 to make two types of patterns 7 and 8 appear. Three types of thermochromic substances having different hues upon temperature and color change may be dispersed in the base material 2 to create three types of patterns. Alternatively, the two types of thermochromic substances 5 and 6 may be selectively dispersed depending on the location of the base material 2, and the respective substances 5 and 6 may be discolored by the laser beams Ll and L2.

Further, in the above embodiment, the thermochromic substances 5 and 6 were heated by irradiation with laser beams Ll and L2, but they may also be heated by irradiation with infrared rays, hot pressing, or the like. In this case as well, it goes without saying that the patterns 7 and 8 of different hues can be made to appear by appropriately selecting the infrared ray irradiation location and the hot press application location and changing the heating temperature.

[Effects of the Invention] As detailed above, the decorative article of the present invention has a novel and excellent appearance, and also has the advantage of being able to create multiple patterns of different colors with a very simple operation. be effective.

[Brief explanation of the drawing]

1 to 3 show embodiments embodying the present invention; FIG. 1 is a partially enlarged cross-sectional view showing a garnish; FIG. 2 is a partially enlarged cross-sectional view showing a state in which a pattern is revealed by irradiating a laser beam. Figure 3 is a partial perspective view showing the state in which the rear garnish is attached to the rear of the automobile, Figures 4 to 6 are partial enlarged cross-sectional views for explaining a method of creating a pattern on another example of the rear garnish, and Figure 7. is a partially enlarged cross-sectional view of another example of a garnish coated with a paint containing a thermochromic substance. 2... Base material, 5, 6... Thermochromic substance, 7
．． 8...Pattern, LL, L2...Laser light. Patent applicant: Toyoda Gosei Co., Ltd. Agent Patent attorney: Hironobu Onda (and 1 other person) 7 years

Claims (1)

[Claims] 1. Multiple types of irreversible thermochromic substances (5, 6) with different color change temperatures and hues at the time of color change are used as a base material (2).
), a plurality of regions of the substrate (2) are heated to different temperatures, and only the thermochromic materials (5, 6) that exceed the color change temperature in each region selectively change color to have a different hue. A decorative item with patterns (7, 8) appearing.