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Film integrated key top

A key top and film technology, applied in the key top field of buttons, can solve the problems of difficult consistency of the key top surface, translucency and non-reflective texture differences, etc.

Inactive Publication Date: 2005-11-23
POLYMATECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, keytop surfaces are not easily consistent after coating, often resulting in large variations in translucency and matte texture across products

Method used

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  • Film integrated key top
  • Film integrated key top
  • Film integrated key top

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example is aimed at figure 2 The film in the integrated key top 14.

[0057] A sheet of resin film 13 having a thickness of 50 µm was stretched from polyethylene terephthalate containing silica powder (average particle diameter 1 to 2 µm) as a fine powder by biaxial stretching molding. Dust or other foreign particles are removed from the surface of the resin film 13 . Cut the matte film to size. The display portion 16 is made by printing on the rear surface of the film 13 with polyester ink. The display portion 16 includes a raised character. In addition, the decorative layer 15 is formed by dense printing using polyester ink.

[0058] The film 13 is deformed to conform to the surface of each resin key top 12 in the forming mold. The deformed film 13 is inserted into a mold for injection molding the resin key top 12 . Then, thermoplastic polycarbonate resin as a material of the resin key tops 12 is injection molded to integrate the resin film 13 and each of ...

Embodiment 2

[0060] This example is aimed at image 3 The film in the integrated key top 14.

[0061]The polyethylene terephthalate was stretched by biaxial stretching forming to form a base film with a thickness of 50 μm. Dust or other foreign particles are removed from the surface of the basement membrane. Then, by a surface coating process, a polyurethane resin containing silica powder (average particle diameter 1-2 [mu]m) as a fine powder was applied to the surface of the base film with a coating roller to make a laminated film. The thickness of the coated polyurethane resin is 2-5 μm. Coating needs to be done carefully so as not to scratch the film surface.

[0062] Aluminum deposition is performed to form a metal film 17 on the rear surface of the resin film 13 by using a batch deposition machine. The metal film 17 has a thickness of 40 nm.

[0063] The resin film 13 is cut to an appropriate size. The display portion 16 is formed on the rear surface of the film 13 by printing u...

Embodiment 3

[0066] This example is aimed at Figure 4 The film in the integrated key top 14.

[0067] Polyethylene terephthalate film containing fine powder is formed by co-extruding polyethylene terephthalate film and polyethylene terephthalate film containing fine powder on both sides of the polyethylene terephthalate base film. Resin film 13 of ethylene terephthalate film. Simultaneously with lamination, fine roughness was created on the film by using an embossing roll. Each polyester layer has a thickness of 5 μm. The total thickness of the laminated film was 50 μm.

[0068] Aluminum is deposited on the rear surface of the resin film 13 to form the metal film 17 by using a batch deposition machine.

[0069] The resin film 13 is cut to an appropriate size. The display portion 16 is formed on the rear surface of the film 13 by printing using polyester ink. The display portion 16 includes a depressed character. At the immediate vicinity of the recessed characters, the metal film 1...

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PUM

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Abstract

A film-integrated key top include a resin key top and a resin film which is integrated with the resin key top. The resin film may be three types: (1) a matte film that contains powders fine enough to provide the film with translucency, (2) a laminate film that includes a base film and a resin matte layer which is laminated on at least one side of the base film, wherein the resin matte layer contains powders fine enough to provide the film with translucency, (3) a processed film that includes the base film or the laminate film, wherein at least a surface of the film is processed to have a roughened portion. Thus, a film-integrated key top which shows excellent translucency as well as excellent matte texture is provided.

Description

technical field [0001] The present invention relates to key tops for buttons used in mobile devices or communication devices such as mobile phones. More specifically, the present invention relates to a film-integrated key top having a resin film which is integrated with the surface of the resin key top and capable of exhibiting excellent translucency and non-reflective texture. Background technique [0002] As for the key top of the button on the hand-held device, the key top in which the resin film and the surface of the thermoplastic resin key top are integrated together, as disclosed in Japanese Patent Laid-Open Publication No. 54154461 and Japanese Patent Laid-Open Publication No. 754656, already known. Such membrane-integrated keytops are known for their thin key bodies and low weight. [0003] Japanese Patent Laid-Open Publication No. 2000-182470 discloses a key top in which a matte outer layer of paint comprising resin beads is app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H13/702
CPCH01H13/702H01H2221/002H01H2219/056
Inventor 小平美帆
Owner POLYMATECH CO LTD