Multipurpose optical intelligent key board apparatus

• US 5,515,045 A
• Filed: 02/14/1994
• Issued: 05/07/1996
• Est. Priority Date: 06/08/1991
• Status: Expired due to Fees

• Current Assignee: Ilgin Corporation
• Original Assignee: Iljin USA (Iljin)
• Inventors: Tak, Seung H.
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): MANNAVA, ASHOK K
• Application Number:
  US08/162,048
• Time in Patent Office: 813 Days
• Field of Search: 341/21, 341/22, 341/23, 341/28, 341/31, 341/26, 400/477, 345/173, 345/176
• US Class Current: 341/23
• CPC Class Codes: G06F 3/0202 Constructional details or processes of manufacture of the input device
• CPC Class Codes: G06F 3/0238 Programmable keyboards key guide holders G06F3/0224
• CPC Class Codes: H03K 17/969 having a plurality of control members, e.g. keyboard

Abstract

A multipurpose optical intelligent key board apparatus permitting a plurality of key tops made of transparent materials in an optical dot matrix arrangement to be moved upward and downward. It forces the corresponding positions of the optical dot matrix to be turned on or off, so that a computer or an electronic appliance can be operated by predetermined key inputs. Therefore, the function command words and characters appearing on the key tops are displayed by a display device supported by its software.

Claims

1. An optical keyboard apparatus, comprising:

a plurality of keys, each of said keys having a respective light interrupting means and a respective vertically light transmissive key top, the respective key top having a transparent lower end, the lower ends of the key tops having respective exposed lower faces and vertical side surfaces, the respective light interrupting means being formed of an opaque material at said vertical side surfaces;

a board having holes, said holes movably receiving said keys in a predetermined matrix array;

a plurality of light sources for generating respective light beams along respective paths below said array, arranged so that depression of the respective keys projects the light interrupting means thereof into the respective paths to interrupt the light beams in the respective paths;

a plurality of light sensors aligned with said paths for sensing passage of the light beams on said paths or interruption of the light beams by said interrupting means; and

an optical display means, beneath said keys, for displaying character patterns on a surface below the keys, wherein said patterns are visible from above the keys through the respective key tops.

2. An optical keyboard apparatus according to claim 1, wherein the character patterns on the surface below the keys are vertically aligned with the respective keys.

3. An optical keyboard apparatus according to claim 2, wherein the optical display means is either an LCD display or an LED display.

4. An optical keyboard apparatus according to claim 1, further comprising means for changing the character patterns simultaneously.

5. An optical keyboard apparatus according to claim 1, wherein all of the character patterns are present at the surface simultaneously.

6. An optical keyboard apparatus according to claim 1 wherein said optical display means comprises a liquid crystal display device having a liquid crystal plate and a luminescence emitting plate, wherein said liquid crystal plate has respective light emitting groups spatially arranged directly below the respective keys, and wherein said luminescence emitting plate is disposed beneath said emitting groups.

7. An optical keyboard apparatus according to claim 1, further comprising:

an opaque middle plate having openings, said middle plate being disposed beneath said board and having a like configuration to said board, and

a plurality of elastic means elastically supporting the respective keys on said middle plate.

8. An optical keyboard apparatus according to claim 7 wherein said optical display means comprises a liquid crystal display device beneath said middle plate, wherein said display device including a liquid crystal plate, wherein said liquid crystal plate has respective light emitting groups spatially arranged directly below the respective keys, and wherein said display device further includes a luminescence plate at a lower portion thereof beneath said emitting groups.

9. An optical keyboard according to claim 7, wherein said plurality of elastic means surround the respective key tops.

10. An optical keyboard according to claim 9, wherein each elastic means comprises a leaf spring.

11. An optical keyboard apparatus according to claim 1, wherein said key tops are formed of a transparent material selected from the group consisting of epoxy resin, acrylic resin, glass and crystal.

12. An optical keyboard according to claim 1, wherein said opaque material comprises metal.