Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard
Reexamination Certificate
1999-01-06
2001-07-10
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Including keyboard
C463S036000, C463S037000, C200S0050EA, C200S0050EA, C200S243000, C084S719000
Reexamination Certificate
active
06259434
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an elastic and actually-activated structure which comprises a dome-shaped elastic body bound on a hard thin film, whereby the elastic and actually-activated body will not bounce undesirably when being placed between the conductive thin film and the cap of keyboard.
BACKGROUND OF THE INVENTION
As shown in
FIG.4
, the key of conventional keyboard generally comprises base plate
71
, conductive film
72
, elastic member
73
, frame
74
and cap
75
. The elastic member
73
is generally of dome shape and abuts the cap
75
and the conductive film
72
on top end and bottom end thereof, respectively. The pressing on the cap
75
will compress the elastic member
73
and enable the connection between the contact of the conductive film
72
and the corresponding circuit. However, the elasticity of the elastic member
73
makes it wont to bounce randomly, the assembling thereof is time-consuming and troublesome.
As shown in
FIG. 5
, another conventional elastic member comprises a dome-shaped elastic member
82
integrally formed with a soft film
81
. The soft film
81
is assembled on a conductive film
83
. This kind of elastic member has the advantages of easy and fast assembly. However, the elastic member is liable to twist due to the flexibility thereof. The positioning of the elastic member will be influenced if it is twisted.
It is on object of the present invention to provide an improved elastic and actually-activated structure for computer keyboard, which can be stably arranged on keyboard and has not the problem of random bounce.
It is another object of the present to provide an improved elastic and tactually-activated structure which is applicable to keyboard of various specification and does not require additional molding process, thus reducing cost.
To achieve above objects, the present invention provides an elastic and tactually-activated structure which is applicable to keyboard and comprises a dome-shaped elastic member having a plurality of vent holes arranged on the bottom side thereof and separated with a predetermined distance. The inventive structure further comprises a hard film having an opening corresponding to the location of key of the keyboard, and the bottom end of the elastic member which has a larger diameter being attached upon the opening. The elastic and actually-activated structure is placed upon the conductive film of the key and the cap of the key is placed upon the top end of the elastic member which has a smaller diameter. When the cap is suppressed, the elastic member is compressed accordingly such that the bump of the elastic member will pass through the opening of the hard film and touch the contact and circuit on the conductive film. The key is therefore formed a closed circuit. In the present invention, the elastic member is directly attached on the hard film, thus simplifying the assembling process and preventing the random bounce of the elastic and tactually-activated structure.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
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patent: 5894039 (1999-04-01), Tsai et al.
patent: 5955690 (1999-09-01), Yoshinaga
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patent: 6191776 (2001-02-01), Hu
Chicony Electronics Co. Ltd.
Nguyen Jimmy H.
Rosenberg , Klein & Lee
Shalwala Bipin
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