# US 2009/0260970 A1 · Keyswitch and keyboard

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- Number: US 2009/0260970 A1
- Document ID: US20090260970A1
- Status: Published application
- Kind: A1
- Application number: 12/423,401
- Filed: 2009-04-14
- Published: 2009-10-22
- Earliest claimed: 2008-04-18
- Assignees: Darfon Electronics Corp.
- Inventors: Lei Lung Tsai; Yun Nien Chai
- Web page: https://patentgrep.com/patent/US20090260970A1

## CPC

- H01H 3/125: {using a scissor mechanism as stabiliser}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

The invention discloses a keyswitch and a keyboard which applies the keyswitch. The keyswitch includes a scissors-like supporting structure and a keycap. The scissors-like supporting structure includes a first arm member. The first arm member has a first axle. A retaining member is formed at the bottom of the keycap. The retaining member has a retaining portion and a block. The distal end of the retaining portion and the distal end of the block form an opening.

## Claims

### Claim 1

A keyswitch comprising:
a scissors-like supporting structure comprising a first arm member, the first arm member having a first axle; and
a keycap, a retaining member being formed at the bottom of the keycap, the retaining member having a retaining portion and a block, the distal end of the retaining portion and the distal end of the block forming an opening;
wherein when the retaining member compresses toward the first axle with the opening, the first axle is limitedly and movably engaged to the retaining member by the elastic deformation of the block.

### Claim 2 (depends on 1)

The keyswitch of claim 1, wherein the size of the opening is slightly smaller than the diameter of the first axle.

### Claim 3 (depends on 2)

The keyswitch of claim 2, wherein when the keyswitch is at a lowest pressed position, the first axle exactly contacts with the block.

### Claim 4 (depends on 1)

The keyswitch of claim 1, wherein the block is substantially column-shaped.

### Claim 5 (depends on 4)

The keyswitch of claim 4, wherein a side of the block which faces the opening is chamfered, such that the first axle is easily assembled from the opening to be engaged to the retaining member.

### Claim 6 (depends on 1)

The keyswitch of claim 1, wherein the retaining portion comprises a main body and a cantilever, the main body is formed at the bottom of the keycap, the cantilever is protruded from the main body.

### Claim 7 (depends on 1)

The keyswitch of claim 1, wherein the appearance of the retaining portion is substantially reversed-L-shaped.

### Claim 8 (depends on 1)

The keyswitch of claim 1, wherein the retaining portion and the keycap are integrally formed.

### Claim 9 (depends on 1)

The keyswitch of claim 1, wherein the scissors-like supporting structure comprises a second arm member, the second arm member has a second axle, a pivoting member is formed at the bottom of the keycap, the second arm member is engaged to the pivoting member with the second axle.

### Claim 10

A keyboard comprising:
a plurality of keyswitches, each keyswitch comprising:
a scissors-like supporting structure comprising a first arm member, the first arm member having a first axle; and
a keycap, a retaining member being formed at the bottom of the keycap, the retaining member having a retaining portion and a block, the distal end of the retaining portion and the distal end of the block forming an opening; and
a base plate, the keyswitches being pivotally disposed on the base plate;
wherein when the retaining member compresses toward the first axle with the opening, the first axle is limitedly and movably engaged to the retaining member by the elastic deformation of the block.

### Claim 11 (depends on 10)

The keyboard of claim 10, wherein the size of the opening of the each keyswitch is slightly smaller than the diameter of the first axle.

### Claim 12 (depends on 11)

The keyboard of claim 11, wherein when the each keyswitch is at a lowest pressed position, the first axle exactly contacts with the block.

### Claim 13 (depends on 10)

The keyboard of claim 10, wherein the block of the each keyswitch is substantially column-shaped.

### Claim 14 (depends on 13)

The keyboard of claim 13, wherein a side of the block of the each keyswitch which faces the opening is chamfered, such that the first axle is easily assembled from the opening to be engaged to the retaining member.

### Claim 15 (depends on 10)

The keyboard of claim 10, wherein the retaining portion of the each keyswitch comprises a main body and a cantilever, the main body is formed at the bottom of the keycap, the cantilever is protruded from the main body.

### Claim 16 (depends on 10)

The keyboard of claim 10, wherein the appearance of the retaining portion of the each keyswitch is substantially reversed-L-shaped.

### Claim 17 (depends on 10)

The keyboard of claim 10, wherein the retaining portion of the each keyswitch and the keycap are integrally formed.

### Claim 18 (depends on 10)

The keyboard of claim 10, wherein the scissors-like supporting structure of the each keyswitch comprises a second arm member, the second arm member has a second axle, a pivoting member is formed at the bottom of the keycap, the second arm member is engaged to the pivoting member with the second axle.