Structure of keyswitch

Details Structure of keyswitch Structure of keyswitch

1999-12-13

2001-02-27

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Actuators

Reexamination Certificate

active

06194677

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an improved structure of keyswitch, especially to a keyswitch, which has lower profile and stable key pressing stroke while the stroke length is not defectively deduced.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, the conventional keyswitch
1
for notebook computer at least comprises a substrate
10
, a flexible circuit layer
11
, a resilient dome
12
, a supporting lever
13
and a keytop
14
. The substrate
10
is provided with a first retaining hook
100
, a second retaining hook
101
, a first through hole
102
and a second through hole
103
. The flexible circuit layer
11
and the resilient dome
12
are respectively stacked on the substrate
10
. The supporting lever
13
comprises a first lever
130
and a second lever
131
pivotal to each other in scissors arrangement. The first lever
130
comprises a rounded sliding shaft
132
on bottom side thereof and slidable within the first retaining hook
100
. The top of the first lever
130
is pivotally connected to the keytop
14
. The second lever
131
comprises a rounded rotating shaft
133
on bottom side thereof and rotatable within the second retaining hook
101
. The top of the second lever
130
is slidably connected to the keytop
14
. The keytop
14
can be lowered to strike the resilient dome
12
by the rotating movement of the rotating shaft
133
and the sliding movement of the sliding shaft
132
. The resilient dome
12
is collapsed to turn on the corresponding switch on the flexible circuit layer
11
and generate associate keyswitch signal.
However, in above-mentioned keyswitch
1
, both the rotating shaft
133
and the sliding shaft
132
lay against the substrate
10
at location beside the though holes
102
and
103
, or against the flexible circuit layer
11
upon the substrate
10
. Therefore, the first retaining hook
100
and the second retaining hook
101
have abrupt-raising height to accommodate the rotating shaft
133
and the sliding shaft
132
. The whole supporting lever
13
is forced to place upon the flexible circuit layer
11
and the height of the keytop
14
relative to the flexible circuit layer
11
can not be reduced. Moreover, the supporting lever
13
is in contact with the flexible circuit layer
11
or the substrate
10
by the tangential portion of the rotating shaft
133
and the sliding shaft
132
, the stability of the supporting lever
13
is poor. The supporting lever
13
may shake when the keytop
14
is pressed.
To overcome above problem, an improved structure of keyswitch is provided and comprises a circuit base with a circuit layer, a resilient dome, a supporting lever and a keytop. The circuit base further comprises a substrate and a flexible circuit layer. T supporting lever comprising a first lever and a second lever pivotal to each other in scissors arrangement. The first lever has a sliding portion on bottom side thereof and the second lever has a rotating portion on bottom side thereof and a sliding portion on top side thereof. The sliding portion of the first lever comprises two clamping blocks and a sliding shaft arranged between the two clamping blocks. The clamping block is extended from the sliding shaft such that the edge at the intersection of an outer surface of the sliding shaft and an bottom surface of the sliding shaft is an embowed square shape. The sliding shaft is entirely or partially embedded into the first through hole. The rotational portion of the second lever has two rotational shafts retained between the second retaining bodies and embedded within the second through hole. Therefore, the height of the keyswitch is lowered and the key pressing operation is more stable.
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:


REFERENCES:
patent: 5763842 (1998-06-01), Tsai et al.
patent: 5964341 (1999-10-01), Tsai
patent: 5994655 (1999-11-01), Tsai
patent: 6011227 (2000-01-01), Yoneyama
patent: 6040540 (2000-03-01), Tsai et al.
patent: 6040541 (2000-03-01), Li

Affiliated with

Also associated with

Rating

Structure of keyswitch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Structure of keyswitch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure of keyswitch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2604626