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Key top

A key top and main body technology, which is applied to household components, applications, electrical components, etc., can solve problems such as roughness, uneven outer surface of the formed key top body 32, and reduced aesthetic appeal of the key top.

Inactive Publication Date: 2003-10-15
POLYMATECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the outer surface of the shaped key top body 32 to become uneven and rough
Therefore, the aesthetic appeal of the keytops is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0024] refer to figure 1 with figure 2 , The key top of the first embodiment includes a generally elliptical columnar key top main body 12 and a resin film 14 adhered to the surface of the key top main body 12 except the rear surface 12a. The key top body 12 and the resin film 14 form a button 30 . In addition, a graphic symbol layer 13 is formed on the rear surface 14 a of the resin film 14 . The key top body 12 is formed by injection molding a translucent synthetic resin into the button 30 .

[0025] The composition, type and color of the resin forming the key top body 12 are not limited as long as the resin is translucent. The resin is selected from known synthetic resins, such as thermoplastic resins, thermoplastic elastomers, cured resins or crosslinked rubbers, according to the required properties. It is preferable to use a cured resin suitable for molding. Particularly preferred are polycarbonate resins, acrylic resins, or polypropylene resins having satisfactory...

Embodiment 1

[0063] In Example 1, the key top 11 having the structure of the first embodiment was manufactured.

[0064] First, the graphic symbol layer 13 in the form of numerals is printed on the rear surface 14a of the translucent resin film 14 made of polyethylene terephthalate resin using black ink. Then, the translucent resin film 14 is stretched and deformed using a jig so that its shape substantially conforms to the front contour of the key top main body 12 .

[0065]The stretched translucent resin film 14 is placed between an upper mold 20 and a lower mold 21 as shown in FIG. 4( a ). Then, the dies 20 and 21 are clamped. Subsequently, molten polycarbonate resin is injected into the cavity 25 through the resin injection gate 26 of the lower mold 21 to form the key top body 12 having the flange 15 . Thus, the translucent resin film 14 is bonded to the key top main body 12 by thermal fusion. Then, the decorative layer 19 is coated on the rear surface 12a of the key top main body 1...

Embodiment 2

[0068] In Example 2, key tops 11 having the structures of the two embodiments were manufactured.

[0069] First, a graphic symbol layer 13 in the form of a telephone symbol is printed on the rear surface 14a of the translucent resin film 14 made of polycarbonate resin and polybutylene terephthalate alloy using red paint. The resin film 14 is stretched and deformed into a shape substantially conforming to the front contour of the key top main body 12 using a jig.

[0070] Subsequently, as shown in FIG. 4( a ), the drawn resin film 14 is placed between the upper mold 20 and the lower mold 21 . Then, the mold 20 and the mold 21 are clamped. Molten polycarbonate resin is injected into the cavity 25 through the resin injection gate 26 of the lower mold 21 to form the key top body 12 having the protruding part 16 . Therefore, in the same manner as the first embodiment, the translucent resin film 14 is bonded to the translucent key top main body 12 by thermal fusion.

[0071] Then...

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PUM

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Abstract

A key top 11 including a resin film 14, a key top body 12 made of resin and being covered by the resin film 14 except for the rear surface 12a thereof, and a first extending portion 15, 16 extending outward from the peripheral surface of the key top body 12. A gate mark 17 formed by a mold gate 26 and a vent mark 18 formed by a mold vent 27 are located on the rear surface 15a,16a of the first extending portion 15,16. The rear surfaces of the key top body and the first extending portion are flat and located rearward from the rear surface 14a of the resin film 14.

Description

technical field [0001] The present invention relates to a key top of a push button switch mounted on various electronic devices such as communication devices including portable phones and mobile phones and audio devices. Background technique [0002] In the prior art, it is desired that electronic equipment including mobile communication terminals, such as portable phones or mobile phones, be light and compact. Therefore, it is desired that the push button switches used in such electronic devices are also light, compact and thin. In order to achieve these requirements, a key top having a translucent main body and a translucent resin film adhered on the entire surface of the main body except the rear surface is used in the prior art. Such key tops are widely used today. [0003] Image 6 is a cross-sectional view of a prior art keytop. The key top includes a key top main body 32 made of translucent resin and a translucent resin film 31 adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H13/14B29C45/14B29C45/34H01H11/00H01H13/02H01H13/70H01H13/702
CPCH01H2229/047H01H13/70B29C45/1418B29C45/34B29C2045/0027B29L2031/466B29C45/14811Y10T428/24752Y10T29/4998Y10T29/49105
Inventor 樫野正幸
Owner POLYMATECH CO LTD