Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-06-11
1998-07-07
Mayes, Curtis
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156247, 156248, 156253, 156267, 156270, 156324, 156510, 156513, 156543, B32B 3118
Patent
active
057762830
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a manufacturing method of switch sheet and an apparatus thereof which is a component part of a concave face switch used for a portable telephone or the like.
2. Description of the Prior Art
A portable telephone has recently been come into wide use in accordance with realizing compactness and low price wherein a various studies are advanced so that thinner, more compact, more lightweight and cheaper one than the prior ones can be provided.
For example, as to a switch used for making contact points of ten keys of a portable telephone and a various kind of function keys or the like be conducted, a concave face switch 1 illustrated in FIG. 3 is adopted instead of a silicon rubber switch (see FIG. 4) and a membrane switch adopted at the beginning, whereby a thickness can be thin, mechanically stable touch can be obtained and it is easy to use it because a timing of a mechanical reverse is equal to one of an electrical touch. The concave face switch 1 comprises a switch sheet 2 on which a metallic dome 3 is stuck, wherein the metallic dome is directly arranged on a base arranged at the portable telephone body, thereby constructing contact point which is made to be conducted electrically.
First, the switch sheet 2 included by the concave face switch 1 has a state wherein, as shown in FIG. 2, fixing holes 4a, holes 4b for deciding a position, holes 4c for exposing dome and LED lighting holes 4d are formed in a film separator 4 by a punch and the like while holes 5a for deciding a position and LED lighting holes 5b are formed in a processing tape 5 (sticking tape) by a punch and the like, a processing tape 5 is manually stuck in the film separator 4 by an operator, thereby producing it, so as to coincide holes for deciding a position 4b with 5a, i.e., so as to coincide the LED lighting holes 4d with 5b and a protective liner 6 is stuck on a back surface side thereof, leading to supplying it with a processing maker. In the switch sheet 2 delivered to the processing maker in this way, the metallic dome 3 is manually stuck on a back surface (adhesive layer) of the processing tape 5 by the operator one by one through holes 4c for exposing dome of the film separator 4, thereby manufacturing the concave face switch 1. After that, a surface sheet on which numerals and symbols of various kinds of functions and alphabet or the like are printed is stuck on a surface of the switch sheet 1 before being fixed in the portable telephone body through the fixing hole 4a thereof.
As mentioned above, a method in which the switch sheet which the concave face switch comprises is manufactured by means of sticking manually the film separator on the processing tape by the operator has problems that a gap of position easily occurs, a yield is low and an amount of production is limited. Therefore, it is tried to manufacture automatically switch sheets, however, it is a present status not to bring into a result satisfied technically.
In other words, as shown in FIG. 2, various kinds of holes formed in the film separator are not always coincided with various kinds of holes formed in the processing tape, whereby it is required to form holes respectively and separately in the film separator and the processing tape. In case of forming various kinds of holes in the processing tape, a back surface of the processing tape has an adhesive layer to stick the metallic dome, wherein, in case of forming holes after feeding it as it is, the adhesive layer is stuck on a side of an apparatus, thereby making it impossible to continue an operation thereafter. Thus, though it can be thought that holes are formed in the film separator before holes are formed in the processing tape by means of piling the processing tape thereon, there is a case wherein some kinds of switch sheets require that holes are formed in only the processing tape so as to be partially overlapped with the holes formed in the film separator. In this case, holes formed in the film separator in advance mak
REFERENCES:
patent: 5451285 (1995-09-01), Santo et al.
Hosiden Corporation
Kabushiki Kaisha Kato Seiko
Mayes Curtis
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