Patent US5036440A successfully refreshed from Google Patents.
US5036440A
Expired / Lapsed
US
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Illumination type keytop
Assignee: Alps Alpine Co Ltd
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Filing: 1990-02-16
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Granted: 1991-07-30
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Expires: 2010-02-16
Abstract
Abstract An illumination type keytop is disclosed, in which a transmitted light restricting member is disposed opposite to a display portion formed in a part of a light intercepting layer and a colored and transparent filter member is disposed on the rear side thereof so that the display portion can be illuminated with light having a high directivity, which has passed through the transmitted light restricting member, at the illumination in the night, etc.
Inventors
- 👤 Yasuo Takii
- 👤 Hitoshi Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:21
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/04; F; F21; F21V; F21V9/00; F21V9/08; H; H01; H01H; H01H9/00; H01H9/18; H01H2009/187; H01H2219/00; H01H2219/028; H01H2219/034; H01H2219/054; H01H2219/058; H01H9/182
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
An illumination type keytop, in which a display portion having a predetermined shape, which is transparent, is disposed in a part of a light intercepting layer so as to face on the top surface side and said display portion is illuminated with light coming from the rear side, comprising: a transmitted light restricting member disposed on the rear side of said light intercepting layer, at least opposite to said display portion, which has an optical anisotropy and makes light pass through, depending on the incident angle; and a colored and transparent filter member disposed on the rear side of said transmitted light restricting member.
Claim 2
Dependent Claim
104 words
An illumination type keytop, in which a display portion having a predetermined shape, which is transparent, is disposed in a part of a light intercepting layer so as to face on the top surface side and said display portion is illuminated with light coming from the rear side, comprising: a transmitted light restricting member disposed on the rear side of said light intercepting layer, at least opposite to said display portion, which has an optical anisotropy and makes light pass through, depending on the incident angle; and a colored and transparent filter member disposed on the rear side of said transmitted light restricting member.
Claim 3
Dependent Claim
84 words
An illumination type keytop according to claim 1 wherein said transmitted light restricting member is worked so as to have a knob-shape by dishing, said light intercepting layer being disposed on the surface of said transmitted light restricting member; said filter member is disposed on the rear side of said transmitted light restricting member at least at a place opposite to said display portion, which member is secured to a reinforcing member made of a transparent resin mold backing said transmitted light restricting member.
Claim 4
Dependent Claim
63 words
An illumination type keytop according to claim 1 wherein said transmitted light restricting member is buried in a base material formed by shaping said transparent resin at a place opposite to said display portion, said light intercepting layer being disposed on the surface of said base material, and said colored filter is disposed on the rear side of said transmitted light restricting member.
Claim 5
Dependent Claim
79 words
An illumination-type keytop comprising: a reinforcing member defining a through-hole; a colored filtered layer disposed adjacent said through-hole; a transmitted light restricting member substantially covering said through-hole and said colored filter layer, said transmitted light restricting member comprising a transmission restricting layer through which light from a preselected incident angle is passed; and a light intercepting layer disposed over said transmitted light restricting member, said light restricting layer defining a display portion disposed opposite a portion of said through-hole
Claim 6
Dependent Claim
79 words
An illumination-type keytop comprising: a reinforcing member defining a through-hole; a colored filtered layer disposed adjacent said through-hole; a transmitted light restricting member substantially covering said through-hole and said colored filter layer, said transmitted light restricting member comprising a transmission restricting layer through which light from a preselected incident angle is passed; and a light intercepting layer disposed over said transmitted light restricting member, said light restricting layer defining a display portion disposed opposite a portion of said through-hole
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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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |