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Method for making key top of push button switch

A manufacturing method and key top technology, applied to electric switches, input/output processes of data processing, instruments, etc., can solve problems such as lower yield, deformation of release sheet 1, position deviation, etc., and achieve good intimacy , Improve adhesion, improve the effect of transfer

Inactive Publication Date: 2003-05-28
POLYMATECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, when the metal thin film layer 2 is transferred to the resin key top 4, because the resin key top 4 and the heat-sealing layer 3 must be integrated, at this time, the display portion on the surface of the resin key top 4 5 Positional deviation is likely to occur in the plane direction indicated by the arrow, and there is a problem that the yield rate is further reduced
And, in order to form heat-seal layer 3 on metal film layer 2, when coating heat-seal layer 3, can damage or bend metal film layer 2, and reduced yield
In addition, as another problem that contributes to the reduction of yield in an overlapping manner, there is also a problem of deformation of the releasable sheet 1.

Method used

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  • Method for making key top of push button switch
  • Method for making key top of push button switch
  • Method for making key top of push button switch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 is corresponding to Figure 1A ~ Figure 3B The shown method of manufacturing the key top 7 for a push button switch. That is, first, a mold release layer 1b is formed on a 16 μm polyester base film 1a, and on this mold release layer 1b, an aluminum alloy with a layer thickness of 30 nm and a visible light transmittance of 20% to 35% is formed on the mold release layer 1b. The thin film layer 2 is used as the metal thin film layer 2 in order to have both luster and illuminance (light transmission) of the metallic tone. In addition, the visible light transmittance in this example was measured using an ultraviolet-visible spectrophotometer (UV-1600 manufactured by Shimadzu Corporation), and the LED light source used generally as a backlight light source for electronic devices such as mobile phones was read. The transmittance at the wavelength (520nm). On the other hand, a transparent acrylic heat-sealing agent is applied to the inside of the molded polycarbonat...

Embodiment 2

[0055] Example 2 is corresponding to Figure 1A ~ Figure 3B The shown method of manufacturing the key top 7 for a push button switch. That is, first, a release layer 1b is formed on a 16 μm polyester base film 1a, and an aluminum thin film layer 2 with a layer thickness of 200 nm and a visible light transmittance of 0% is formed on the release layer 1b by a vacuum evaporation method. It is used as the metal thin film layer 2 in order to have both the luster of the metallic tone and the light-emitting property (light-transmitting property). In addition, this visible light transmittance is the transmittance obtained by the same measuring method as Example 1 mentioned above. On the other hand, a red transparent acrylic heat-sealing agent is applied to the inside of the molded polycarbonate resin key top 4 in a hollow shape corresponding to the display portion 5 to form the heat-sealing layer 3 . Further, the aluminum thin film layer 2 is transferred onto the resin key top 4 thr...

Embodiment 3

[0057] Example 3 is corresponding to Figure 4 The method of manufacturing the key top 14 for a push button switch is shown. That is, first, a release layer 1b is formed on a 25 μm polyester base film 1a, and on this release layer 1b, a layer of chromium with a thickness of 20 nm and a visible light transmittance of 18% to 37% is formed on the release layer 1b. The thin film layer 12 is used as the metal thin film layer 12 in order to have both luster and illuminance (light transmission) of the metallic tone. In addition, this visible light transmittance is the transmittance obtained by the same measuring method as Example 1 mentioned above. On the other hand, a transparent acrylic heat-sealing agent is applied to the inside of the molded polycarbonate resin key top 4 in the same shape as that of the display portion 5 to form the heat-sealing layer 11 . Furthermore, the chromium thin film layer is transferred through the heat-sealing layer 11 corresponding to the same shape ...

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Abstract

A method of manufacturing a key top for a push-button switch according to the present invention includes forming a hot-melt adhesive layer on a resin key top so as to have a shape corresponding to a display portion for displaying a letter, symbol, or other indicia, and transferring a metallic thin film layer onto the hot-melt adhesive layer. Therefore, the metallic thin film layer is not damaged due to coating of the hot-melt adhesive layer, and positioning of the display portion is unnecessary. Further, when a transfer resin layer is formed on the metallic thin film layer, oxidation of the metallic thin film layer or damages thereto can be prevented.

Description

technical field [0001] The present invention relates to a key top used in a push button switch of communication equipment such as a mobile phone, a car phone, and a remote controller, or a push button switch of various other electric / electronic devices, and a manufacturing method thereof. Background technique [0002] In the prior art, as a cover member of a button switch used in a communication device, particularly a portable communication device such as a mobile phone or a car phone, a translucent resin key top and a translucent elastic key base are widely used. Covering parts for illuminated pushbutton switches. Moreover, among them, there is also a plan that the entire surface of the resin key top is illuminated, and there is a preferred plan in the market in which the display surface of the display portion having a display of characters and symbols has both metallic luster and illuminance (transparency). Tendency (as related technology, refer to Japanese Patent Laid-Op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H13/02H01H11/00H01H13/14H01H13/702
CPCH01H2209/0021H01H13/702H01H2229/01H01H2219/03Y10T29/49105Y10T29/4998Y10T428/24752Y10T428/24802
Inventor 清水政成菊池一雄
Owner POLYMATECH CO LTD