Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate
1996-03-29
2001-07-17
Chiang, Jack (Department: 2642)
Telephonic communications
Supervisory or control line signaling
Substation originated
C379S433020
Reexamination Certificate
active
06263070
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a telephone and, in particular, to a portable telephone.
In consideration of use at night, a portable telephone has a device for lighting each key of a keypad from the inside of the portable telephone. In order to improve an appearance quality of the portable telephone, it is preferable that the lighting device lights each key uniformly.
2. Description of the Related Art
FIG. 1
shows an example of a telephone in the related art. The portable telephone
10
has a structure in which a telephone body assembly
11
and a keypad
12
are contained in a case assembly
15
which consists of a combination of a rear case assembly
13
and a front case assembly
14
.
The telephone body assembly
11
has a plurality of LEDs (Light-Emitting Diodes)
17
, each between adjacent key contacts
16
. When it is used at night, a button for lighting is pressed, the LEDs
17
emit light, and the light
18
from the LEDs
17
propagates and diffuses as indicated by arrows shown in
FIG. 2
in the keypad
12
which is made of a silicon rubber. Thereby, all key tops
19
-
1
,
19
-
2
,
19
-
3
, . . . are lit from the inside.
As seen from
FIG. 2
, the light from the LEDs
17
approaches each key top from the side of the key. As a result, it is likely that a portion of the key top nearer a respective LED
17
is brighter accordingly. For example, in
FIG. 2
, the portions
20
are bright while the portions
21
are dim. With regard to the key top
19
-
2
, for example, as shown in a brightness curve X in
FIG. 2
, the mid portion is dimmest. With regard to the key top
19
-
1
, the left side portion is dark. With regard to the key top
19
-
3
, the right side portion is dark. Thus, unevenness in brightness occurs in each key top and thus an appearance quality is poor.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a telephone in which the above-mentioned problem is solved.
A first telephone according to the present invention, comprises:
a case;
an operation part, located in a front side of the case, having a light transmission property and having a plurality of key tops arranged on a rear surface thereof, each key top comprising a projection for pressing a contact part;
a circuit substrate, provided inside the case and having a sheet-luminescent-member driving circuit; and
a sheet luminescent member, sheet-shaped, luminescent on the front surface thereof, having openings formed in positions corresponding to those of the projections and terminals electrically connected with the circuit substrate;
the sheet luminescent member being provided in the rear side of the operation part, between the circuit substrate and the case, where the terminals are electrically connected with the circuit substrate and the openings face the projections respectively;
wherein light emitted by the sheet luminescent member is incident on each key top from the rear surface thereof.
Thereby, it is possible to make uniform brightness through the entirety of the front surface of each key top, in comparison to the case of the related art. As a result, an appearance quality of the telephone, when used at night, can be improved.
Further, the openings of the sheet luminescent member allow the projections of key tops to pass therethrough, and therefore, provision of the sheet luminescent member does not degrade an easy operation condition of the key tops.
A second telephone according to the present invention, comprises:
a case;
an operation part, located in a front side of the case, and having a plurality of key tops arranged thereon;
a liquid crystal display part exposed to the front side of the case;
a circuit substrate, provided inside the case and having a sheet-luminescent-member driving circuit; and
a sheet luminescent member, sheet-shaped, luminescent on the front surface thereof, having terminals electrically connected with the circuit substrate;
the sheet luminescent member being provided in the rear side of the operation part, between the circuit substrate and the case, where the terminals are electrically connected with the circuit substrate and the openings face the projections respectively;
wherein light emitted by the sheet luminescent member is incident on the liquid crystal display part from the rear surface thereof.
Thereby, it is possible to make uniform brightness through the entirety of the liquid crystal display part, in comparison to the case of the related art. As a result, an appearance quality of the telephone, when used at night, can be improved.
A third telephone according to the present invention, comprises:
a case;
an operation part, located in a front side of the case, having a light transmission property and having a plurality of key tops arranged thereon, each key top having a projection arranged on the rear surface thereof for pressing a contact part;
a liquid crystal display part exposed to the front side of the case;
a circuit substrate, provided inside the case and having a sheet-luminescent-member driving circuit; and
a sheet luminescent member, sheet-shaped, luminescent on the front surface thereof, having terminals electrically connected with the circuit substrate;
the sheet luminescent member being provided in the rear side of the operation part, between the circuit substrate and the case, where the terminals are electrically connected with the circuit substrate and the openings face the projections respectively;
wherein light emitted by the sheet luminescent member is incident on each key top from the rear surface thereof and also to the liquid crystal display part from the rear surface thereof.
Thereby, it is possible to make uniform brightness through the entirety of the front surface of each key top, in comparison to the case of the related art. As a result, an appearance quality of the telephone, when used at night, can be improved.
Further, it is also possible to make uniform brightness through the entirety of the liquid crystal display part, in comparison to the case of the related art. As a result, an appearance quality of the telephone, when used at night, can be improved.
Further, the openings of the sheet luminescent member allow the projections of key tops to pass therethrough, and therefore, provision of the sheet luminescent member does not degrade an easy operation condition of the key tops.
A fourth telephone according to the present invention, comprises:
a case;
an operation part, located in a front side of the case, having a light transmission property and having a plurality of key tops arranged thereon, each key top having a projection arranged on the rear surface thereof for pressing a contact part;
a liquid crystal display part exposed to the front side of the case;
a circuit substrate, provided inside the case and having a sheet-luminescent-member driving circuit; and
a sheet luminescent member, sheet-shaped, having standing portions facing two side surfaces of the liquid crystal display part and terminals electrically connected with the circuit substrate, the sheet luminescent member being luminescent on the front surface thereof and also luminescent on surfaces of the standing portions facing the two side surfaces of the liquid crystal display part;
the sheet luminescent member being provided in the rear side of the operation part, between the circuit substrate and the case, where the standing portions face the two side surfaces of the liquid crystal display part, the terminals are electrically connected with the circuit substrate and the openings face the projections respectively;
wherein:
light emitted by the sheet luminescent member is incident on each key top from the rear surface thereof; and
light emitted from the surfaces of the standing portions of the sheet luminescent member facing the two side surfaces of the liquid crystal display part is incident on the liquid crystal display part from the two side surfaces.
Thereby, advantages similar to those of the above-described first telephone can also be obtained. Further, because light emitted from the s
Kobayashi Hidekatsu
Kubo Hiroshi
Tomura Masashi
Chiang Jack
Fujitsu Limited
Staas & Halsey , LLP
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