US4892387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light controlling sheet
Assignee: Tokai Rika Co Ltd
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Filing: 1988-07-20
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Granted: 1990-01-09
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Expires: 2008-07-20
Abstract
Abstract The present invention is directed to a light controlling sheet in use for optical indicators which comprises louver elements including an arbitrary pattern of walls which are parallel to each other and so opaque as to absorb incident light; transparent layers for permitting the incident light to pass therethrough and light reflection layers for reflecting the incident light. The transparent layers and the light reflection layers are mutually interposed between the walls of the louver element. The oblique light from the light source strikes the side surfaces of the walls, while the substantially parallel light from the light source passes through the transparent layers toward the observer. The extraneous light is reflected at the front surface of the light reflection layers so that the light controlling sheet is bright and stands out clearly.
Inventors
- 👤 Noboru Takeuchi
- 👤 Masakazu Goto
- 👤 Hiroaki Takahashi
- 👤 Takeshi Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:51
CPC Classifications
G; G12; G12B; G12B11/00; G09; G09F; G09F9/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A light controlling sheet for use for optical indicators comprising: louver element means 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 means, said walls being constructed of an opaque material for absorbing incident light; transparent layers for permitting incident light to pass therethrough; and light reflection layers for reflecting incident light; said transparent layers and the light reflection layers being mutually arranged in a side-by-side arrangement adjacent to each other with a wall of said louver element means being interposed therebetween.
Claim 2
Dependent Claim
101 words
A light controlling sheet for use for optical indicators comprising: louver element means 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 means, said walls being constructed of an opaque material for absorbing incident light; transparent layers for permitting incident light to pass therethrough; and light reflection layers for reflecting incident light; said transparent layers and the light reflection layers being mutually arranged in a side-by-side arrangement adjacent to each other with a wall of said louver element means being interposed therebetween.
Claim 3
Dependent Claim
30 words
A light controlling sheet for use for optical indicators according to claim 1, wherein said arbitrary pattern of walls of said lower element means is arranged in a hexagon shape.
Claim 4
Dependent Claim
20 words
A light controlling sheet for use for optical indicators according to claim 1, wherein said transparent layers are air layers.
Claim 5
Dependent Claim
24 words
A light controlling sheet for use for optical indicators according to claim 1, wherein said light reflection layers are arranged in a hexagon shape.
Claim 6
Dependent Claim
117 words
A light controlling sheet for use for optical indicators comprising: louver element means including an arbitrary pattern of walls having openings therebetween, inner surfaces of said walls defining openings and extending in the direction of thickness of said louver element means, said walls being constructed of an opaque mterial for absorbing incident light; transparent layers for permitting the incident light to pass therethrough, said transparent layers being defined between the walls of said louver element means; and a light reflection layer having the same pattern as said walls of said louver element means, said light reflection layer being adhered to a front surface of said louver element means so that both patterns thereof conform to each other.
Claim 7
Dependent Claim
117 words
A light controlling sheet for use for optical indicators comprising: louver element means including an arbitrary pattern of walls having openings therebetween, inner surfaces of said walls defining openings and extending in the direction of thickness of said louver element means, said walls being constructed of an opaque mterial for absorbing incident light; transparent layers for permitting the incident light to pass therethrough, said transparent layers being defined between the walls of said louver element means; and a light reflection layer having the same pattern as said walls of said louver element means, said light reflection layer being adhered to a front surface of said louver element means so that both patterns thereof conform to each other.
Claim 8
Dependent Claim
32 words
A light controlling sheet according to claim 5, and further including a colored transparent film adhered to the front surface of said louver element means with said light reflection layer interposed therebetween.
References Cited (Backward Citations)
US4506953A
Cited
US4772097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |