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Reduced noise key unit

Imported: 24 Feb '17 | Published: 06 Jan '04

Toshisada Takeda, Bryan Kang, Yoshinori Kobayashi

USPTO - Utility Patents

Abstract

A key unit of a keyboard apparatus having at least one bumper extending from the key unit for cushioning the impact of the key unit against the enclosure of the keyboard apparatus when the key unit assumes a depressed position and/or when the key unit resumes a non-depressed position, thereby eliminating or reducing the feedback noise, while retaining the benefits of a pre-loaded feature for the key unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, features and advantages of the invention, its construction and operation will be best understood from the following detailed description of preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, of which:

FIG. 1 is a disassembled view of a key unit according to the present invention;

FIG. 2 is a disassembled view of a first type of a key unit according to the present invention;

FIG. 3A is a disassembled view of a second type of a key unit according to the present invention;

FIG. 3B is a disassembled view of a third type of a key unit according to the present invention;

FIG. 4 is a disassembled view of a fourth type of key unit according to the invention;

FIG. 5 is a disassembled view of a fifth type of a key unit according to the present invention; and

FIG. 6 is a sectional view of a key unit according to the present invention similar to that shown in FIG.

5.

Claims

1. A key unit of an apparatus, wherein said key unit is able to assume a depressed position, and wherein said apparatus has a stop that restricts the movement of said key unit, said key unit further comprising:

2. A key unit as claimed in claim 1, wherein said apparatus has an electrical signal producing means for producing an electrical signal in response to said pressure, and wherein said member is mounted in a position above said electrical signal producing means, said member having a bottom surface being movable in said defined direction by said pressure to engage said electrical signal producing means.

3. A key unit as claimed in claim 1, wherein said member is a pad.

4. A key unit as claimed in claim 3, wherein said pad is made of a resilient material.

5. A key unit as claimed in claim 1, wherein said member and said at least one bumper of said member are made of a silicon rubber material.

6. A key unit as claimed in claim 1, wherein said apparatus has a top plate having an inner surface, and wherein said stop of said apparatus comprises at least one rib fixedly suspended from said inner surface of said top plate of said apparatus in said defined direction and restricting said movement of said key unit upon said contact with said at least one bumper of said member.

7. A key unit as claimed in claim 1, wherein said at least one bumper of said member extends along-side said keycap into contact with said stop of said apparatus.

8. A key unit as claimed in claim 1, wherein said keycap further comprises a button base in the upper part of said keycap, said base containing the indicia of said key unit.

9. An apparatus comprising:

10. An apparatus claimed in claim 9, wherein said member of said key unit is mounted in a position above an electrical signal producing means for producing an electrical signal in response to said pressure applied to said at least one said key unit; said member having a bottom surface being movable by said pressure in said defined direction to engage said electrical signal producing means.

11. An apparatus claimed in claim 9, wherein said member of said key unit is made of a resilient material.

12. An apparatus claimed in claim 9, wherein said member of said key unit and said at least one bumper of said member are made of a silicon rubber material.

13. An apparatus claimed in claim 9, wherein said keycap mounted on said member for movement in unison with said member, wherein said at least one bumper of said member extends along-side said keycap into said contact with said stop of said apparatus when said key unit is returned from said depressed position.

14. An apparatus claimed in claim 9, wherein said keycap of said key unit further comprises a thicker button base in the upper part of said keycap, said base containing the indicia of said key unit.

15. An apparatus as claimed in claim 9, wherein said member comprises a restorative component.

16. An apparatus as claimed in claim 15, wherein said restorative component is a spring.