JPH03116085A - Transparency display parts - Google Patents

Abstract

PURPOSE:To obtain the transparency display parts being free from unevenness of a display part caused by laser beam machining and having a stable quality by providing a transparent paint film layer between a colored light transmission paint film layer and a light opaque paint film layer. CONSTITUTION:This display parts consists of a colored light transmission paint film layer 2 formed in a part of a formed body 1 formed by a transparent synthetic resin, a transparent paint film 3 formed in a part on the colored light transmission paint film layer 2, and a light opaque paint film 4 formed on the transparent paint film 3, and the light opaque paint film 4 is eliminated partially by laser marker working and a cut-out display part 5 is formed. In such a way, since the transparent paint film which does not absorb a laser is interposed between the light masking paint film 4 and the colored light transmission paint film 32, even if a laser light passes through the transparent paint film 3 and radiates an interface of the transparent paint film 3 and the colored light transmission paint film 2, the colored light transmission paint film 2 can be secured safely since the transparent paint film 3 adheres closely, and there is no unevenness in light from the reverse side of the formed body 1, and a display can be executed exactly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for displaying predetermined information in color by placing it in front of a light source, such as nameplates and key tops of automobiles, home appliances, and other electric/electronic products. The invention relates to a translucent display body.

[Conventional technology]

Conventionally, light-transmitting key tops molded by injection using a light-transmitting synthetic resin as a base have been used as key tops for switches.

This translucent key top is an alternative to ink screen printing or intaglio offset printing, and because it offers greater flexibility in the shape of the processed surface and ease of processing, the display section is formed by cutting it out using laser processing. Key tops for switches are increasingly being used. That is, this type of display has a colored translucent coating formed on a plastic molded body, and a light-obscuring coating is further provided thereon, and the photo-obscuring coating is partially exposed to a YAG laser, CO, or laser. It is known that it can be removed using

[Problem to be solved by the invention]

However, with transparent key tops that have a light-hidden coating on top of a colored transparent coating, the thickness of the coating varies;
The problem is that the laser is not able to remove it cleanly, or the laser output is too strong (the colored translucent coating is also partially removed by the laser, so there is a drawback that it becomes uneven when light is applied from the back side of the translucent display material. However, there is also the disadvantage that the surface of markings cut out with a laser is rough due to the heat of the laser and is easily smudged.Additionally, markings cut out with a laser have a rough surface due to the heat of the laser and are easily smudged.Furthermore, markings with a metallizing layer on top of a colored transparent coating are also colored and transparent by laser processing. There have been problems such as the paint film tends to cause unevenness, resulting in a poor finish, and furthermore, laser adjustment is complicated and productivity cannot be improved.

The present invention aims to eliminate these conventional drawbacks, and allows stable marking even if the thickness of the light-hidden coating film varies or the laser output is large, and the display has less unevenness on the surface. We have created an easy-to-read translucent display with a display area that is resistant to dirt, which is significantly better in terms of production efficiency and freedom of design, and has greatly improved precision, and has a good appearance with high commercial value. The object is to provide a light-transmitting display body at low cost.

[Means to solve the problem]

The present invention relates to a transparent plastic molded article, a colored transparent coating film formed on the plastic molded article, a transparent coating film formed on the colored transparent coating film, and a transparent coating film formed on the transparent coating film. 1. A translucent display comprising a laminate comprising a light-hidden coating film and a display portion in which the light-hidden coating film is partially removed by processing with a laser marker. It is a thing.

(Function) To explain with an example of a translucent key top of a push button switch for a vehicle according to the present invention, a colored translucent coating layer formed on at least a part of a molded body made of a translucent synthetic resin; It consists of a transparent coating film formed on a part of the colored light-transmitting coating layer and a light-hiding coating film formed on the transparent coating film, and the light-shielding coating film is partially coated with a laser marker. Since the display part is removed by processing and cut out, a uniform translucent key top can be obtained on the laser-processed display part.
In particular, with this push-button switch, a transparent coating that does not absorb laser is interposed between the light-hiding coating and the colored light-transmitting coating, allowing the laser light to pass through the transparent coating. The transparent coating remains in close contact even when the interface between the molded body and the colored translucent coating is irradiated, so the colored translucent coating can be safely protected, and the light from the back side of the molded object is not uneven, allowing for accurate display. Moreover, the surface after laser processing is not damaged, has few irregularities and does not attract dirt.In addition to being easy to form and greatly increasing productivity, it can also be made into a keypad with excellent wear resistance. Moreover, it can be used as a low-cost product.

[Example] Regarding the translucent key (7) of the vehicle pushbutton switch of the present invention, the examples in Figures 1 to 4 will be explained. l, a colored translucent coating 2 formed on at least a portion of the plastic molded body l, a transparent coating 3 formed on the colored translucent coating 2, and a top of the transparent coating 3. The light-suppressing coating 4 is partially processed with a laser marker and removed to form a cut-out display section 5. It has optical key tops.

In this case, even if the plastic molded body 1 is colorless and transparent, translucent, or originally colored, it is preferable that the plastic molded body 1 has a past &1i3 pass rate of 10% or more. Types include thermoplastic resin acrylic, polycarbonate PVC, ABS, P
There are thermoplastic elastomers such as P, PS, PET or 70 of these, and thermosetting resins such as epoxy, urethane, and silicone rubber, and acrylic, polycarbonate, urethane, and silicone rubber are selected and used based on their transparency and heat resistance.

A colored translucent coating W12 is partially or entirely coated on the north side of the molded body 1 made of these translucent synthetic resins.
The coating film 2 is usually white, red, or blue.

A colored material such as green is used, and it is desirable that the light transmittance is 0.2% or more as a whole, including the translucent resin.The paint and ink used here include rosin,
Natural resin derivatives such as maleic acid resin and fumaric acid resin, phenolic resin, and urea resin.

Ketone resin, polyvinyl chloride resin, acrylic resin.

Synthetic resins such as petroleum resins, polyester resins, and polyurethane resins are blended with suitable coloring materials such as pigments, dyes, and additives, or are blended in advance. It is applied onto a photosensitive plastic molded body 1 so that it is visible when the surface layer is cut out, and consideration is given so that it can be contrasted with the base fertilizer Q coating 4, such as black, navy blue, or other coloring.

In addition, the transparent coating film 3 includes colorless or colored transparency, has a transparency to the extent that the surface is not processed by laser marking, and can be formed by known means such as painting or printing. , vinyl,
Urethane type and silicone type are selected and used.

The conditions for this transparent coating film are YAG laser wavelength 106
Acrylic-based, vinyl-based, urethane-based, and silicone-based coatings can be used as colorless or colored transparent coatings that transmit 0n+* light, and acrylic urethane is an example of a resin that transmits 1060ns light. Acrylic resin face for urethane 70% additive
2%? Container
l 4% Boisocyanate ° 14% total
A mixture of 30 to 60% solvent to 100% solvent is used.

The solvent is toluene or xylene for the object to be painted.

Select 4@ types and amounts from MIEK, acetic acid, acetic acid cellosolve acetate, etc., and create a paint.

Furthermore, the light-hiding coating film 4 can be formed by known means such as painting and printing.

For example, acrylic, acrylic urethane, vinyl,
Although silicone-based paints are used, reaction-curing acrylic urethane-based paints are weather resistant.

It is desirable because it has excellent abrasion resistance, scratch resistance, and chemical resistance.The light shielding property here may be 5% or less in terms of light transmittance, preferably 0.3% or less.

In addition, when applying the light-hiding coating film 4, the coating (spray) coating varies widely, and when a coating of 25μ is applied,
Since the range is 25±15μ, the laser
If it is adjusted to ~15μ processing, thick coating parts can be processed, and thin coating films can be marked stably without damaging the colored transparent coating underneath due to the protection of the transparent layer.For example, with a mask type laser. When a coating film of 25 ± 15 μm was marked under the conditions of 8J″ ClO pulse,
Thin areas could be removed in 7 pulses, but thicker areas could be removed in 10 pulses. The part of the thin film removed by 7 pulses will be irradiated with +3 pulses more, and the colored transparent coating under the light-hiding coating 4 will be damaged by the laser. Therefore, by interposing the transparent coating film 3 between them, the YAG laser light passes through the transparent coating film and irradiates the interface between the transparent coating film and the colored transparent coating film, but the transparent coating film is not in close contact with the transparent coating film. This protects the colored translucent coating, which eliminates unevenness in the light coming from the back side, and the surface after laser processing is not damaged and has fewer irregularities and is less likely to get dirty.

There are scan type and mask type laser markers for processing and forming the display section 5, but from the viewpoint of processing speed, it is preferable to use the mask type.
In the infrared region from 00 to 20000n-, C(h, YA
G, alexandrite, etc., and EXIM [! A laser such as R is used,
The output can be appropriately selected depending on the type of laser, the type of light-hiding coating 4, and the film thickness as shown in Table 1. YAG laser is also preferable.

The thinner the light-hiding coating film 4 is, the easier it is to perform laser processing.For example, a coating film of acrylic urethane paint with a colored white layer of 20 μm, a transparent layer of 10 μm, and a light-hiding layer of 25 μm of black is processed at a wavelength of 1060 μm.
When processing with +v mask type YAG laser, the output is 8 J/cd-pulse, good processing is achieved with 8 pulses or more, and the output is 10 J/-puls.
Even with 5 pulses e and l, the marking portion is not processed and a good processing condition is maintained, and only the former fertile coating film 4 is laser processed.

Next, examples of the present invention will be shown.

Example 1 A plastic molded product 1 in the shape of a key top with a curved surface (concave surface) on the medium heat top surface is formed by injection using a colorless and transparent polycarbonate resin, and a colored coating film is applied on top of it by solid white printing using Kunbo Seisenbetsu. Layer 2 is provided, and then an acrylic urethane transparent paint is applied to the entire surface using a spray gun to form a transparent coating 3 with a thickness of about 10 μm, and an acrylic urethane matte black paint is used as a former fertilizing coating layer 4. was applied with a spray gun to a film thickness of approximately 25 μm.

This material was processed into the display part 5 by partially removing the original cocoon layer using a mask type YAG laser with a wavelength of 1060n and an output of 8J/-.pulse and 10 pulses (example in Figure 3).The key tops were colored. The coating layer was not processed, the recesses were processed without any problems, and when light was applied from the back side, the processed display area 5 had an excellent appearance with no unevenness.

Example 2 A plastic molded product 1 was molded into a key top shape using a light-transmitting silicone rubber, and a colored coating layer 2 was provided on the surface by screen printing in a solid white manner, and a silicone-based transparent resin was further applied. A transparent coating film 3 was formed by coating to a thickness of approximately 3 μm, and a former fertilizing coating layer 4 was provided thereon to a thickness of approximately 25 μm using a silicone-based black paint. The original cocoon layer was partially removed using a mask-type YAG laser with a wavelength of 11,060 nm and an output of 10 J/-・pulse + 10 pulses to create display area 5 (example in Figure 4). When viewed from the front, this item Alternatively, when illuminated from the back, the processed display area became even and aesthetically pleasing.

【Effect of the invention〕

Since the transparent display body according to the present invention has a transparent coating layer between the colored transparent coating layer and the original fertilizer coating layer, even if the processed surface is a curved surface, the original fertilizer cocoon layer can be Even if there are variations, if the laser output is kept above a certain level, the display part will be a stable translucent display with uniform quality due to laser processing, and the display part has a transparent layer on the surface and will not be laser processed. Therefore, the surface will not be rough and dirt will not stick to it (as well as
As a display object that is illuminated from the back side, a translucent display material with no unevenness of light can be obtained, and by using this translucent display material, the shading of light and translucency can be effectively utilized, and the entire product can be aesthetically pleasing. In addition to providing excellent abrasion resistance, it is possible to create translucent key tops with character patterns and key tops with other silhouettes and patterns, which greatly increases the freedom of design. Utilizing the transparent properties of , it is possible to make a key top type push button switch with good appearance due to the difference in light transmittance.The key top is easy to see without reflecting direct light from the outside, and it is easy to manufacture. It has the useful effect of being able to produce a good finish and at a low cost.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, in which Fig. 1 is a plan view of a push button switch and a key top, Fig. 2 is an enlarged vertical sectional view, and Fig.
FIG. 4 is a longitudinal sectional view of another embodiment. l...Translucent plastic molded body, 2...Colored transparent coating film, 3...Transparent coating film, 4...Originally obstructive coating film, 5.
...Display section.

Claims (1)

[Claims] (1) A transparent plastic molded body, a colored transparent coating formed on the plastic molded body, a transparent coating formed on the colored transparent coating, and a transparent coating formed on the transparent coating. A translucent display object comprising a laminate comprising a light-hiding coating film and a display portion in which the light-blocking coating film is partially removed by processing with a laser marker. .