BACKLIGHT KEYBOARD AND STRUCTURE THEREOF

• US 20140218890A1
• Filed: 02/05/2014
• Published: 08/07/2014
• Est. Priority Date: 02/06/2013
• Status: Active Grant

• Current Assignee: Darfon Electronics Company Limited (Darfon Electronics Corporation), Darfon Electronics Corporation
• Original Assignee: Darfon Electronics Company Limited (Darfon Electronics Corporation), Darfon Electronics Corporation
• Inventors: Wang, Ching-Yu
• Granted Patent: US 9,176,272 B2
• Time in Patent Office: Days
• US Class Current: 362/23.03
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G06F 3/0202 Constructional details or processes of manufacture of the input device
• CPC Class Codes: H01H 13/83 characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
• CPC Class Codes: H01H 2219/062 Light conductor

Abstract

A backlight keyboard structure includes a light guide plate, a base plate and a keyboard frame. The keyboard frame comprising a fixing portion. The base plate is adjacent to one side of the light guide plate and disposed between the keyboard frame and the light guide plate. The base plate has a through hole corresponding to the fixing portion. The base plate has an indentation portion surrounding the through hole and disposed between the light guide plate and the through hole for shielding.

Claims

1. A backlight keyboard structure comprising:

a light guide plate comprising an opening portion, and the light guide plate guiding a light;

a keyboard frame comprising a fixing portion; and

a base plate adjacent to the light guide plate and disposed between the keyboard frame and the light guide plate, the base plate having a through hole and an indentation portion surrounding the through hole;

wherein the opening portion, the through hole and the fixing portion are disposed correspondingly, the indentation portion extends toward the opening portion of the light guide plate, so that the indentation portion shields the light emitted from the light guide plate and reduces the light entering the through hole.

2. The backlight keyboard structure of claim 1, wherein the base plate comprises a first surface and a second surface opposite to each other, the through hole penetrates the base plate, and a surrounding of the through hole is depressed from the first surface toward the second surface to form the indentation portion.

3. The backlight keyboard structure of claim 1, wherein the indentation portion is stamped to form a recess portion surrounding the through hole.

4. The backlight keyboard structure of claim 1, wherein the opening portion comprises an inner surface, and the indentation portion extends into the opening portion so as to shield at least a part of the inner surface of the opening portion.

5. The backlight keyboard structure of claim 4, wherein a depth of the indentation portion is larger than or equal to a thickness of the light guide plate, so that the indentation portion completely shields the inner surface of the opening portion.

6. A backlight keyboard comprising:

a keyboard casing;

a backlight keyboard structure comprising;

a light guide plate comprising an opening portion, and the light guide plate guiding a light;

a keyboard frame comprising a fixing portion; and

a base plate adjacent to one side of the light guide plate and disposed between the keyboard frame and the light guide plate, the base plate having a through hole and an indentation portion surrounding the through hole;

wherein the opening portion, the through hole and the fixing portion are disposed correspondingly, the indentation portion extends toward the opening portion of the light guide plate, so that the indentation portion shields the light emitted from the light guide plate and reduces the light entering the through hole, and the fixing portion passes through the through hole to connect to the keyboard casing; and

a light source adjacent to the light guide plate, the light source emitting the light into the light guide plate.

7. The backlight keyboard of claim 6, wherein the light source comprises a circuit board and a light emitting component electrically connected to the circuit board, and the light emitting component is disposed within the light guide plate or is coplanar with the light guide plate.

8. The backlight keyboard of claim 7, further comprising a film circuit board disposed between the keyboard frame and the base plate, the film circuit board comprising a plurality of switches, and each of the plurality of switches being selectively actuated respectively.

9. The backlight keyboard of claim 8, further comprising a plurality of key caps disposed on an upper side of the film circuit board and located in a position corresponding to the plurality of switches.

10. The backlight keyboard of claim 6, wherein the indentation portion is stamped to form a recess portion surrounding the through hole.

11. The backlight keyboard of claim 6, wherein the opening portion comprises an inner surface, and the indentation portion extends into the opening portion so as to shield at least a part of the inner surface of the opening portion.

12. The backlight keyboard of claim 11, wherein a depth of the indentation portion is larger than or equal to a thickness of the light guide plate, so that the indentation portion completely shields the inner surface of the opening portion.

13. The backlight keyboard of claim 6, wherein the base plate comprises a first surface and a second surface opposite to each other, the through hole penetrates the base plate, and a surrounding of the through hole is depressed from the first surface to the second surface to form the indentation portion.