# US 8,770,772 B1 · Luminous keyboard

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- Number: US 8,770,772 B1
- Document ID: US8770772B1
- Status: Granted
- Kind: B1
- Application number: 13/769,594
- Filed: 2013-02-18
- Granted: 2014-07-08
- Earliest claimed: 2013-02-18
- Assignees: Changshu Sunrex Technology Co., Ltd.
- Applicants: Qing Zhang
- Inventors: Qing Zhang
- Web page: https://patentgrep.com/patent/US8770772B1

## CPC

- 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 2219/044: Edge lighting of layer
- H01H 2219/056: Diffuser; Uneven surface
- H01H 2219/062: Light conductor
- 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 luminous keyboard includes: a press key unit and a backlight module unit including a light guiding plate, a plurality of light guiding points, an upper light-permeable thin film disposed on a top surface of the light guiding plate, a lower light-permeable thin film disposed on a bottom surface of the light guiding plate, and a luminous element. The upper and lower light-permeable thin films respectively have refractive indices lower than that of the light guiding plate.

## Claims

### Claim 1

A luminous keyboard, comprising:
a press key unit including a plurality of press keys; and
a backlight module disposed under said press key unit and including a light guiding plate, a plurality of light guiding points which are formed on a bottom surface of said light guiding plate and corresponding in position to said press keys, an upper light-permeable thin film disposed on a top surface of said light guiding plate, a lower light-permeable thin film that is disposed on said bottom surface, that is opposite to said upper light-permeable thin film and that covers said light guiding points, and a luminous element from which light beams are incident to said light guiding plate;
wherein said upper and lower light-permeable thin films respectively have refractive indices lower than that of said light guiding plate so that a total internal reflection of the light beams occurs between said upper and lower light-permeable thin films, and said light guiding points scatter and direct the light beams to pass through said upper light-permeable thin film and to illuminate said press keys.

### Claim 2 (depends on 1)

The luminous keyboard of claim 1, wherein said backlight module further includes a light-reflecting coating layer formed on a bottom surface of said lower light-permeable thin film so as to reflect light beams that leak from said lower light-permeable thin film to said light guiding plate.

### Claim 3 (depends on 2)

The luminous keyboard of claim 2, wherein said backlight module further includes a light-blocking coating layer coated on a bottom surface of said light-reflecting coating layer so as to prevent leakage of the light beams.

### Claim 4 (depends on 2)

The luminous keyboard of claim 2, wherein said backlight module further includes a shading element disposed on said upper light-permeable thin layer for preventing leakage of the light beams, said shading element being formed with a plurality of openings corresponding in position to said light guiding points and providing the light beams with a progressing path.

### Claim 5 (depends on 4)

The luminous keyboard of claim 4, wherein said backlight module further defines a receiving space that penetrates said upper light-permeable thin film, said light guiding plate, said lower light-permeable thin film, and said light-reflecting coating layer, and that is used for receiving said luminous element.

### Claim 6 (depends on 5)

The luminous keyboard of claim 5, wherein said shading element is a light blocking plate disposed on said upper light-permeable thin film and covering said receiving space.

### Claim 7 (depends on 5)

The luminous keyboard of claim 5, wherein said shading element is a light blocking coating, said backlight module further including an upper baffle plate embedded in said shading element to cover said receiving space.

### Claim 8 (depends on 1)

The luminous keyboard of claim 1, further comprising a lateral baffle wall surrounding said light guiding plate so as to prevent leakage of the light beams.

### Claim 9 (depends on 1)

The luminous keyboard of claim 1, wherein said press key unit further includes an insulator thin film disposed under said press keys, a membrane circuit unit disposed under said insulator thin film, and a supporting member disposed under said membrane circuit unit so as to support said press keys, said insulator thin film, and said membrane circuit board.

### Claim 10 (depends on 1)

The luminous keyboard of claim 1, wherein each of said light guiding points has a light-guiding coating to reflect the light beams toward said press keys.

### Claim 11 (depends on 1)

The luminous keyboard of claim 1, wherein each of said light guiding points has a plurality of microstructures formed on said bottom surface of said light guiding plate so as to scatter the light beams toward said press keys.