Method for manufacturing key pad with rigid resin key top

• US 6,451,143 B2
• Filed: 08/07/2001
• Issued: 09/17/2002
• Est. Priority Date: 02/19/1999
• Status: Expired due to Fees

• Current Assignee: Polymatech Company Limited
• Original Assignee: Polymatech Company Limited
• Inventors: Nishi, Kengo
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): WARD, JESSICA LEE
• Application Number:
  US09/923,889
• Publication Number:
  US 20020000284A1
• Time in Patent Office: 406 Days
• Field of Search: 156/272.2, 156/272.6, 156/275.5, 156/275.7, 156/274.4, 156/274.6, 156/274.8, 156/325, 156/273.3, 156/82, 200/308, 200/310-314, 200/317, 200/341, 427/508, 427/533, 427/535, 427/558, 427/553, 427/569, 427/570, 427/574, 264/446, 264/483, 264/448
• US Class Current: 156/82
• CPC Class Codes: B44C 3/02 Superimposing layers B44C3/005 takes precedence
• CPC Class Codes: H04M 1/23 Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof by improving visibility H04M1/22

Abstract

A method for manufacturing a highly productive key pad with rigid resin key top, wherein the key top adhesion surface 2, 6 of the key pad 1, 5 or a portion thereof is surface altered by at least one method selected from short wavelength UV irradiation treatment, corona discharge treatment, flame treatment and plasma treatment and can be adhered with reactive hardening resin 3, 7 such as urethane base resin, epoxy base resin, amino base resin, acrylic base resin, cyanoacrylate base resin and photo reactive hardening resin, thereby reducing adhesion operation time, without fear of dislocation during the adhesion.

Claims

1. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by flame treatment;

applying a urethane base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.

2. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by flame treatment;

applying an amino base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.

3. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by flame treatment;

applying a cyanoacrylate base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.

4. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by corona discharge treatment;

applying a urethane base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.

5. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by corona discharge treatment;

applying an amino base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.

6. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by corona discharge treatment;

applying a cyanoacrylate base reactive hardening resin on the surface modified adhesion interface; and

providing a key top molded with rigid resin;

adhering the key top to the reactive hardening resin.

7. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by flame treatment;

applying a acrylic base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.

8. A method for forming a key, the method comprising the steps of:

providing a key pad base of silicone rubber with an adhesion interface;

surface modifying the adhesion interface of the key pad base by corona discharge treatment;

applying a acrylic base reactive hardening resin on the surface modified adhesion interface;

providing a key top molded with rigid resin; and

adhering the key top to the reactive hardening resin.