US4788094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light controlling sheet
Assignee: Tokai Rika Co Ltd
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Filing: 1986-10-09
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Granted: 1988-11-29
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Expires: 2006-10-09
Abstract
Abstract The disclosure relates to a light controlling sheet for use with indicators which includes a louver element including an arbitrary pattern of walls which are parallel to each other and opaque so as to absorb light, and an electrically conductive film which is mounted on one surface of the louver element. This film is porous so that the light from a light source may penetrate. The oblique light strikes the opaque walls of the louver element and is absorbed in the walls, while the substantially parallel light is permitted to pass through the space or transparent portion betwee the walls. The electrically conductive film not only acts as a protective cover for the louver element but also shields unwanted electromagnetic wave.
Inventors
- 👤 Masayuki Morita
- 👤 Noboru Takeuchi
- 👤 Masakazu Goto
- 👤 Hiroaki Takahashi
- 👤 Takeshi Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:19
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; G; G02; G02B; G02B5/00; H01J2229/00; H01J2229/89; H01J2229/8905; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/12; Y10T428/12361; Y10T428/24; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T428/24322
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A light controlling sheet for use in indicators comprising: a louver element including an arbitrary pattern of walls having openings therebetween, inner surfaces of said walls defining said openings and extending in a direction of thickness of said louver element, said walls being opaque such that oblique light striking the inner surfaces of said walls may be absorbed by said walls while substantially parallel light may only travel through said openings in a direction which is substantially parallel to said walls; and an electrically conductive film mounted on one surface of said louver element, said film permitting light to pass through openings therein, said film acting as a protective cover for said louver element and acting to avoid electromagnetic waves.
Claim 2
Dependent Claim
120 words
A light controlling sheet for use in indicators comprising: a louver element including an arbitrary pattern of walls having openings therebetween, inner surfaces of said walls defining said openings and extending in a direction of thickness of said louver element, said walls being opaque such that oblique light striking the inner surfaces of said walls may be absorbed by said walls while substantially parallel light may only travel through said openings in a direction which is substantially parallel to said walls; and an electrically conductive film mounted on one surface of said louver element, said film permitting light to pass through openings therein, said film acting as a protective cover for said louver element and acting to avoid electromagnetic waves.
Claim 3
Dependent Claim
24 words
The light controlling sheet as recited in claim 1, wherein said film has a pattern which corresponds to the pattern of said louver element.
Claim 4
Dependent Claim
20 words
The light controlling sheet as recited in claim 1, wherein said film is opaque so as to absorb extraneous light.
Claim 5
Dependent Claim
21 words
The light controlling sheet as recited in claim 1, wherein said film is a member of a contact for a switch.
References Cited (Backward Citations)
US4232104A
Cited
JPS55139250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |