Patent US4872000A successfully refreshed from Google Patents.
US4872000A
Expired / Lapsed
US
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Coordinate input apparatus
Assignee: Hitachi Ltd
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Filing: 1987-07-20
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Granted: 1989-10-03
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Expires: 2007-07-20
Abstract
Abstract A coordinate input apparatus which comprises a display unit having a display layer, and a protecting layer disposed on said display layer and having two-dimensionally arranged light guides for transmitting light from the display layer in the direction substantially perpendicular to the display layer, wherein a user designates a coordinate position on the display layer through the protecting layer.
Inventors
- 👤 Mitsunari Kano
- 👤 Yoshiharu Konishi
- 👤 Toshihiko Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:34
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/037; G06F3/038; G06F3/0386
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
A coordinate input apparatus comprising a display unit provided with a display layer, and a transparent protecting layer provided on said display layer so that, when a desired coordinate position on said display layer is designated through said protecting layer to thereby input coordinate position information, said display layer produces a visible indication on the outer surface of said protecting layer, said protecting layer comprising a layer of light guides two-dimensionally arranged so as to transmit light form a spot on said display layer in the direction substantially perpendicular to said display layer to a spot on the outer surface of said protecting layer, so as to minimize apparent displacement between a designated coordinate position on said display layer and the position of a resulting visual indication on said outer surface of said protecting layer.
Claim 2
Dependent Claim
135 words
A coordinate input apparatus comprising a display unit provided with a display layer, and a transparent protecting layer provided on said display layer so that, when a desired coordinate position on said display layer is designated through said protecting layer to thereby input coordinate position information, said display layer produces a visible indication on the outer surface of said protecting layer, said protecting layer comprising a layer of light guides two-dimensionally arranged so as to transmit light form a spot on said display layer in the direction substantially perpendicular to said display layer to a spot on the outer surface of said protecting layer, so as to minimize apparent displacement between a designated coordinate position on said display layer and the position of a resulting visual indication on said outer surface of said protecting layer.
Claim 3
Dependent Claim
59 words
A coordinate input apparatus according to claim 1, wherein said protecting layer further comprises a thin glass layer provided between said display layer and said layer of light guides and having a thickness which is substantially less than the thickness of said layer of light guides for protecting said display layer while adding structural strength to said protecting layer.
Claim 4
Dependent Claim
30 words
A coordinate input apparatus according to claim 1, wherein said light guides include short pieces of optical fibers made of glass fibers two-dimensionally arranged in close relation to each other.
Claim 5
Dependent Claim
30 words
A coordinate input apparatus according to claim 1, wherein said light guides include short pieces of optical fibers made of plastic fibers two-dimensionally arranged in close relation to each other.
Claim 6
Dependent Claim
31 words
A coordinate input apparatus according to claim 1, wherein said light guides include short pieces of metal pipes having a high reflection factor two-dimensionally arranged in close relation to each other.
Claim 7
Dependent Claim
15 words
A coordinate input apparatus according to claim 1, wherein said display unit is a CRT.
Claim 8
Dependent Claim
18 words
A coordinate input apparatus according to claim 1, wherein said display unit includes a liquid crystal display unit.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |