# Patent

## Title
Keypad assembly and electronic device using the same

## Abstract

A keypad assembly includes a keycap, fixing bracket, and at least one fixing member. The fixing member fixes the keypad to the fixing bracket. The fixing bracket includes a frame, a fixing portion located on a middle portion of the frame, and at least two resilient portions. The resilient portions interconnect the frame and the fixing portions. The keycap fixes on the fixing portion. The resilient portions are capable of elastically deforming and generating elastic restoring force to the keycap.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is related to two co-pending U.S. patent applications, application Ser. No. 12/944,924 filed on Nov. 12, 2010, application Ser. No. 12/953,758 filed on Nov. 24, 2010, all entitled “KEYPAD ASSEMBLY AND ELECTRONIC DEVICE USING THE SAME”, and the inventor is Bin Dai. The above-identified applications have the same assignee as the instant application and are concurrently filed herewith. The disclosures of the above-identified applications are incorporated herein by reference.
BACKGROUND
1. Technical Field
The present disclosure relates to data input, and particularly, to a keypad assembly used in an electronic device.
2. Description of the Related Art
Electronic devices often provide a keypad on a panel thereof, thus allowing control input.
A commonly-used keypad assembly is located on a housing of an electronic device. The housing defines a mounting port in a rear surface of the housing. The keypad assembly includes a keycap, a key switch, and a curved spring. The keycap is received in the mounting port, and a protrusion is arranged at a bottom of the keycap. The key switch includes a contact portion. The curved spring is sleeved on the protrusion and resists the housing. The protrusion resists a top of the spring. When the keycap is depressed, the spring is thereby elastically deformed, such that the protrusion presses the contact portion. When the keycap is released, the spring returns to its relaxed state and resists the protrusion. However, the keypad assembly occupies a larger volume because of the protrusion and the spring.
Therefore, there is room for improvement within the art.



BRIEF DESCRIPTION OF THE DRAWINGS
The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout several views, and all the views are schematic.
FIG. 1 is a partial, assembled, isometric view of one embodiment of an electronic device which includes a housing and a keypad assembly mounted on the housing, and the keypad assembly includes a fixing bracket and a keycap fixed on the fixing bracket.
FIG. 2 is an exploded, isometric view of the electronic device shown in FIG. 1.
FIG. 3 is similar to FIG. 2, but viewed from another aspect.
FIG. 4 is an isometric view of the fixing bracket shown in FIG. 1.
FIG. 5 is a cross-sectional view taken along line V-V of FIG. 1.



DETAILED DESCRIPTION
Referring to FIGS. 1 and 2, an embodiment of an electronic device 100 includes a housing 101 and a keypad assembly 103 located on the housing 101. In the illustrated embodiment, the keypad assembly 103 is a main menu button, and the housing 101 is a planar glass plate.
The keypad assembly 103 includes a keycap 20, a fixing bracket 30, a first fixing member 40, and a second fixing member 50. The first fixing member 40 fixes the keycap 20 to the fixing bracket 30. The second fixing member 50 fixes the fixing bracket 30 to the housing 101.
The keycap 20 includes a top cover 21, a filling portion 23, and a bottom cover 25. The top cover 21 includes an interface 212, a biasing surface 213, and a receiving frame 215. The biasing surface 213 is defined on a surface of the top cover 21 opposite to the interface 212. The receiving frame 215 is substantially rectangular, and located on a middle portion of the interface 212. In the illustrated embodiment, the biasing surface 213 is a concave depression defined in a side surface of the top cover 21. The filling portion 23 is received in the receiving frame 215. The bottom cover 25 is substantially circular, and fixed on the interface 212. The bottom cover 25 defines a through hole 251, corresponding to the receiving frame 215, in a center of the bottom cover 25. The top cover 21, the filling portion 23 and the bottom cover 25 are respectively made of different materials to optimize aesthetic outcomes and wear. In this embodiment, the filling portion 23 and the bottom cover 25 are made of black plastic material. The top cover 21 is made of a transparent plastic material resistant to wear, and integrally formed with the filling portion 23 and the bottom cover 25 by bi-color injection molding.
Referring to FIGS. 3 and 4, the fixing bracket 30 includes a frame 31, a fixing portion 32, and two resilient portions 35. In the illustrated embodiment, the frame 31 defines an opening (not labeled) in a middle portion of the frame 31 in which the fixing portion 32 is located above. The fixing portion 32 includes two pairs of protrusions 323, and each pair of the protrusions 323 extend from opposite sides of the fixing portion 32, respectively. Each resilient portion 35 interconnects the frame 31 and one pair of the adjoining protrusions 323. The two resilient portions 35 are all substantially U-shaped, such that the fixing portion 32 projects out from the frame 31. The fixing portion 32 defines a through hole 321 in the center of the fixing portion 32.
In the illustrated embodiment, the first fixing member 40 and the second fixing member 50 are double-sided adhesive tapes. Shape of the first fixing member 40 is the same as that of the fixing portion 32 of the fixing bracket 30. Shape of the second fixing member 50 is the same as that of the frame 31 of the fixing bracket 30.
The housing 101 defines a mounting port 102 in a middle portion of the housing 101. The top cover 21 of the keycap 20 is slidably received in the mounting port 102.
Referring to FIGS. 1, 2 and 5, during assembly of the keypad assembly 103, the first fixing member 40 is fixed to the fixing portion 32 of the fixing bracket 30. Then, the fixing portion 32 of the fixing bracket 30 is fixed to the bottom cover 25 of the keycap 20. The filling portion 23 is received in the through hole 321 of the fixing bracket 30. The second fixing member 50 is fixed to the frame 31, and the frame 31 is fixed to the housing 101. The top cover 21 is received in the mounting port 102.
When the top cover 21 of the keycap 20 is depressed, the top cover 21 slides toward the mounting port 102 of the housing 101, such that the resilient portions 35 are elastically deformed. When the top cover 21 of the keycap 20 is released and returns the keycap 20 to its original position, the resilient portions 35 return to a relaxed state and resist the keycap 20. Thereby, the resilient portions 35 can provide an elastic restoring force to the keycap 20, and without requiring additional dedicated resilient member and protrusion to be located on the keycap 20, and the occupied volume of the keypad assembly 103 is thereby decreased.
It is to be understood that the first fixing member 40 and the second fixing member 50 can also be glue, bolts, or a plurality of latching structures.
Finally, while the present disclosure has been described with reference to particular embodiments, the description is illustrative of the disclosure and is not to be construed as limiting the disclosure. Therefore, various modifications can be made to the embodiments by those of ordinary skill in the art without departing from the true spirit and scope of the disclosure as defined by the appended claims.

## Claims

1. A keypad assembly comprising:
a keycap;
a fixing bracket; and
a fixing member fixing the keycap to the fixing bracket, wherein the fixing bracket comprises a frame, a fixing portion located above a middle portion of the frame and two resilient portions interconnecting the frame and the fixing portions; the keycap fixes on the fixing portion, and the resilient portions are capable of elastically deforming and providing an elastic restoring force to the keycap.

2. The keypad assembly of claim 1, wherein the keycap comprises a top cover and a filling portion fixed on the top cover.

3. The keypad assembly of claim 2, wherein the top cover comprises an interface, a biasing surface opposite to the interface and a receiving frame located on a middle portion of the interface, and the filling portion is received in the receiving frame.

4. The keypad assembly of claim 3, wherein the biasing surface is a concave depression defined in a side surface of the top cover.

5. The keypad assembly of claim 3, wherein the keycap further comprises a bottom cover fixed on the interface, and the bottom cover defines a through hole in the center of the bottom cover to receive the receiving frame.

6. The keypad assembly of claim 1, wherein the fixing portion comprises two pairs of protrusions respectively extending from opposite sides of the fixing portion, and each resilient portion interconnecting one pair of the protrusions and the frame.

7. The keypad assembly of claim 1, wherein each resilient portion is substantially U-shaped, and the fixing portion is projected out from the frame.

8. An electronic device comprising:
a housing defining a mounting port;
a keypad assembly located on the housing, the keypad assembly comprising:
a keycap received in the mounting port;
a fixing bracket;
a first fixing member fixing the keycap to the fixing bracket; and
a second fixing member fixing the fixing bracket to the housing, wherein the fixing bracket comprises a frame, a fixing portion located above a middle portion of the frame, and two resilient portions interconnecting the frame and the fixing portions, the keycap fixes on the fixing portion, and the resilient portions are capable of elastically deforming and providing an elastic restoring force to the keycap.

9. The electronic device of claim 8, wherein the keycap comprises a top cover and a filling portion fixed on the top cover.

10. The electronic device of claim 9, wherein the top cover comprises an interface, a biasing surface opposite to the interface and a receiving frame located on a middle portion of the interface, and the filling portion is received in the receiving frame.

11. The electronic device of claim 10, wherein the biasing surface is a concave depression defined in side surface of the top cover.

12. The electronic device of claim 10, wherein the keycap further comprises a bottom cover fixed on the interface, and the bottom cover defines a through hole in the center of the bottom cover to receive the receiving frame.

13. The electronic device of claim 8, wherein the fixing portion comprises two pair of protrusions respectively extending from opposite sides of the fixing portion, and each resilient portion interconnecting one pair of the protrusions and the frame.

14. The electronic device of claim 8, wherein each resilient portion is substantially U-shaped, and the fixing portion is projected out from the frame.

15. The electronic device of claim 8, wherein the first fixing member and the second fixing member are a plurality of double sided adhesive tapes.