US5515045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multipurpose optical intelligent key board apparatus
Assignee: Iljin Corp
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Filing: 1992-06-05
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Granted: 1996-05-07
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Expires: 2012-06-05
Abstract
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.
Inventors
- 👤 Seung H. Tak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:35
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/968; H03K17/969; G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/0202; G06F3/023; G06F3/0238
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
187 words
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.
Claim 2
Dependent Claim
187 words
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.
Claim 3
Dependent Claim
25 words
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.
Claim 4
Dependent Claim
22 words
An optical keyboard apparatus according to claim 2, wherein the optical display means is either an LCD display or an LED display.
Claim 5
Dependent Claim
17 words
An optical keyboard apparatus according to claim 1, further comprising means for changing the character patterns simultaneously.
Claim 6
Dependent Claim
20 words
An optical keyboard apparatus according to claim 1, wherein all of the character patterns are present at the surface simultaneously.
Claim 7
Dependent Claim
58 words
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.
Claim 8
Dependent Claim
47 words
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.
Claim 9
Dependent Claim
68 words
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.
Claim 10
Dependent Claim
18 words
An optical keyboard according to claim 7, wherein said plurality of elastic means surround the respective key tops.
Claim 11
Dependent Claim
15 words
An optical keyboard according to claim 9, wherein each elastic means comprises a leaf spring.
Claim 12
Dependent Claim
31 words
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.
Claim 13
Dependent Claim
13 words
An optical keyboard according to claim 1, wherein said opaque material comprises metal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-07 | 1999-11-06 | 2000-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-07 | 2003-11-06 | 2004-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-07 | 2007-11-06 | 2008-05-07 | $7700.00 | Window Closed / Lapsed |