US4538216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting apparatus
Assignee: Toshiba Corp
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Filing: 1982-07-21
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Granted: 1985-08-27
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Expires: 2002-07-21
Abstract
Abstract An lighting apparatus including a housing having an opening, a light source received in the housing and a light transmitting-cover fixed at the opening of the housing and through which light rays are projected from the light source. The light transmitting-cover includes a plate made of light transmitting-material and having a first surface and a second surface. Segment lens elements of the same size are arranged on the first and second surface of the plate and formed integrally with the plate. The segment lens elements on the first surface are positioned in face-to-face relation with the segment lens elements arranged on the second surface, thus forming a segment lens. The segment lens elements have a common optical axis and convex surfaces, respectively. The focal lengths defined by these convex surfaces are equal. The focal point of one of the segment lens elements lies on the convex surface of the other segment lens element, and the focal point of the other segment lens element lies on the convex surface of the other segment lens element.
Inventors
- 👤 Leo Mori
- 👤 Mamoru Tominaga
- 👤 Takashi Aoba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:38
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/02; G02B5/0205; G02B5/021; G02B5/0215; G02B5/0273; G02B5/0278; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625; G09; G09F; G09F13/00; G09F13/04; G09F13/0409; G09F13/0418; G09F13/0472; G09F13/0481
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
176 words
A lighting apparatus having a first light transmitting-cover through which light rays are projected, said first light transmitting-cover comprising: a plate of light transmitting-material having a first and second surfaces; a plurality of first segment lens elements of a same size and a same shape, integrally formed with the plate and arranged on the first surface of the plate; and a plurality of second segment lens elements of a same size and a same shape, integrally formed with the plate and arranged on the second surface of the plate in face-to-face relation with the plurality of first segment lens elements, respectively, thereby forming a plurality of segment lenses, wherein the first and second segment lens elements of each pair have a common optical axis and convex surfaces and have substantially equal focal lengths so that a focal point of the first segment lens element lies on a convex surface of the second segment lens element and a focal point of the second segment lens element lies on a convex surface of the first segment lens element.
Claim 2
Dependent Claim
176 words
A lighting apparatus having a first light transmitting-cover through which light rays are projected, said first light transmitting-cover comprising: a plate of light transmitting-material having a first and second surfaces; a plurality of first segment lens elements of a same size and a same shape, integrally formed with the plate and arranged on the first surface of the plate; and a plurality of second segment lens elements of a same size and a same shape, integrally formed with the plate and arranged on the second surface of the plate in face-to-face relation with the plurality of first segment lens elements, respectively, thereby forming a plurality of segment lenses, wherein the first and second segment lens elements of each pair have a common optical axis and convex surfaces and have substantially equal focal lengths so that a focal point of the first segment lens element lies on a convex surface of the second segment lens element and a focal point of the second segment lens element lies on a convex surface of the first segment lens element.
Claim 3
Dependent Claim
23 words
The lighting apparatus according to claim 1, wherein each of said first and second segment lens elements further comprises a spheroidal convex surface.
Claim 4
Dependent Claim
23 words
The lighting apparatus according to claim 1, wherein each of said first and second segment lens elements further comprises a substantially polygonal shape.
Claim 5
Dependent Claim
23 words
The lighting apparatus according to claim 1, wherein each of said first and second segment lens elements further comprises a substantially trapezoidal shape.
Claim 6
Dependent Claim
23 words
The lighting apparatus according to claim 1, wherein each of said first and second segment lens elements further comprises a substantially hexagonal shape.
Claim 7
Dependent Claim
24 words
The lighting apparatus according to claim 1, wherein each of said first and second segment lens elements further comprises an elongated cylindrical convex surface.
Claim 8
Dependent Claim
16 words
The lighting apparatus according to claim 1, wherein said plate is made of a transparent material.
Claim 9
Dependent Claim
16 words
The lighting apparatus according to claim 1, wherein said plate is made of a semi-transparent material.
Claim 10
Dependent Claim
26 words
The lighting apparatus according to claim 1, wherein said second segment lens element from which light rays are projected, is covered with a light diffusing layer.
Claim 11
Dependent Claim
19 words
The lighting apparatus according to claim 6, wherein said first and second segment lens elements are contacted each other.
Claim 12
Dependent Claim
35 words
The lighting apparatus according to claim 6, wherein said first and second segment lens elements are so arranged that the convex surfaces of the first and second segment lens elements are elongated in different directions.
Claim 13
Dependent Claim
25 words
The lighting apparatus according to claim 1, further comprising a plurality of light reflecting regions, each of which is arranged between adjacent first segments regions.
References Cited (Backward Citations)
US1317872A
Cited
US1489697A
Cited
US1211447A
Cited
US1250669A
Cited
US2220639A
Cited
JPS4877830A
Cited
DE2607415A1
Cited
JPS51100723A
Cited
US4165154A
Cited
FR2404270A1
Cited
DE2929971A1
Cited
US4373178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |