# US 10,312,030 B2 · Illuminated keypad module with limited light leakage

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- Number: US 10,312,030 B2
- Document ID: US10312030B2
- Status: Granted
- Kind: B2
- Application number: 15/867,712
- Filed: 2018-01-11
- Published: 2019-03-28
- Granted: 2019-06-04
- Earliest claimed: 2017-09-22
- Assignees: Lite-On Electronics (Guangzhou) Limited; Lite-On Technology Corporation
- Applicants: Lite-On Electronics (Guangzhou) Limited; Lite-On Technology Corporation
- Inventors: Ming-Fu Yen; Chen-Yu Tsai
- Web page: https://patentgrep.com/patent/US10312030B2

## CPC

- H01H 13/10: Bases; Stationary contacts mounted thereon
- H01H 13/14: Operating parts, e.g. push-button
- H01H 13/705: characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
- H01H 13/83: characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
- H01H 3/125: {using a scissor mechanism as stabiliser}
- H01H 2219/054: Optical elements
- H01H 2219/062: Light conductor
- H01H 2219/064: Optical isolation of switch sites
- 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

A keypad module, including a bottom plate, a circuit film, a plurality of barricades, an elastic body, a scissor mechanism and a keycap. The circuit film is disposed on the bottom plate and includes a switch. The barricades are disposed upright on the circuit film and surrounds the switch. The elastic body is disposed on the switch. The scissor mechanism is fixed on the bottom plate and disposed at a position close to the switch on the circuit film. The keycap is fixed on the scissor mechanism and covers the switch, the elastic body, the scissor mechanism and the barricades.

## Claims

### Claim 1

A keypad module, comprising:
a bottom plate;
a circuit film, disposed on the bottom plate and comprising a switch;
a barricade, disposed upright on the circuit film and surrounding the switch;
an elastic body, disposed on the switch;
a scissor mechanism, fixed on the bottom plate and disposed at a position close to the switch on the circuit film; and
a keycap, fixed on the scissor mechanism and covering the switch, the elastic body, the scissor mechanism and the barricade, wherein the keycap comprises a top cover and a plurality of side walls connected to the top cover, the keycap moves between an initial position and a pressing position, and when the keycap is at the initial position, a distance between the barricade and the top cover is larger than or equal to a distance difference between the initial position and the pressing position.

### Claim 2 (depends on 1)

The keypad module according to claim 1, wherein the barricade are formed by punching the circuit film to be formed integrally with the circuit film.

### Claim 3 (depends on 1)

The keypad module according to claim 1, further comprising:
a soft light shielding film, attached to the circuit film, the barricade being formed by punching the soft light shielding film.

### Claim 4 (depends on 1)

The keypad module according to claim 1, further comprising:
a frame structure, disposed on the circuit film, the barricade being formed by punching or injecting the frame structure.

### Claim 5 (depends on 1)

The keypad module according to claim 1, further comprising:
a frame structure, disposed on the circuit film, the barricade being attached to the frame structure.

### Claim 6 (depends on 1)

The keypad module according to claim 1, wherein a height of the barricade ranges from 0.5 mm to 1.2 mm.

### Claim 7 (depends on 1)

The keypad module according to claim 1, wherein a thickness of the barricade ranges from 0.1 mm to 0.2 mm.

### Claim 8 (depends on 1)

The keypad module according to claim 1, wherein the barricade respectively correspond to the side walls, a height H1 of the barricade satisfies H1≥H2−X*tan θ, wherein H2 is a distance between the side wall corresponding to the barricade and the circuit film, X is a distance between a projection P1 of the barricade with respect to the circuit film and a projection P2 of the corresponding side wall with respect to the circuit film, and θ ranges from 0° to 60°.

### Claim 9 (depends on 8)

The keypad module according to claim 8, wherein θ ranges from 30° to 60°.