EP0051976A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical refractor for diffusing light
Assignee: Toshiba Corp
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Filing: 1981-11-04
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Granted: —
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Expires: 2001-11-04
Abstract
Abstract An optical refractor comprises a plate (11) made of transparent material and having a first surface and a second surface. Segment lens elements (31) of the same size are arranged on the first and second surface of the plate (11) and formed integrally with the plate (11). The segment lens elements (31) on the first surface are positioned in face-to-face relation with the segment lens elements (31) arranged on the second surface, thus forming pairs of segment lens element. The segment lens elements have a common optical axis (32) and convex surfaces (33a and 33b), respectively. The focal lengths defined by these convex surfaces (33a and 33b) are equal. The focal point of one of the segment lens elements lies on the convex surface of the other segment lens element, and that of the other segment lens element lies on the convex surface of the first segment lens element.
Inventors
- 👤 Leo Mori
- 👤 Takashi Aoba
- 👤 Mamoru Tominaga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 11:46
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
177 words
An optical refractor comprising: a plate of transparent material having a first and a second surface; and a plurality of first segment lens elements (33a) of the same size and the same shape, integrally formed with the plate and arranged on the first surface of the plate; characterized by further comprising a plurality of second segment lens elements (33b) of the same size and the same shape, integrally formed with the plate and arranged on the second surface of the plate in face-to-face relation with the first segment lens element, respectively, thereby forming a plurality of segment lenses (31), wherein the first and second segment lens elements (33a, 33b) of each pair have a common optical axis (32) and a convex surface of revolution each and have a substantially equal focal distance so that the focal point of the first segment lens element (33a) lies on the convex surface of the second segment lens element (33b) and that of the second segment lens element (33b) lies on the convex surface of the first segment lens element (33a).
Claim 2
Dependent Claim
177 words
An optical refractor comprising: a plate of transparent material having a first and a second surface; and a plurality of first segment lens elements (33a) of the same size and the same shape, integrally formed with the plate and arranged on the first surface of the plate; characterized by further comprising a plurality of second segment lens elements (33b) of the same size and the same shape, integrally formed with the plate and arranged on the second surface of the plate in face-to-face relation with the first segment lens element, respectively, thereby forming a plurality of segment lenses (31), wherein the first and second segment lens elements (33a, 33b) of each pair have a common optical axis (32) and a convex surface of revolution each and have a substantially equal focal distance so that the focal point of the first segment lens element (33a) lies on the convex surface of the second segment lens element (33b) and that of the second segment lens element (33b) lies on the convex surface of the first segment lens element (33a).
Claim 3
Dependent Claim
27 words
An optical refractor according to claim 1, characterized in that each of said first and second segment lens elements (33a, 33b) is formed on a rectangular region.
Claim 4
Dependent Claim
27 words
An optical refractor according to claim 1, characterized in that each of said first and second segment lens elements (33a, 33b) is formed on a hexagonal region.
Claim 5
Dependent Claim
27 words
An optical refractor according to claims 1 to 3, characterized in that each of the first and second segment lens elements (33a, 33b) has a spherical surface.
Claim 6
Dependent Claim
31 words
An optical refractor according to claims 1 to 3, characterized in that one of the first and second segment lens element (33a, 33b) has a convex surface defined by an ellipse.
Claim 7
Dependent Claim
30 words
An optical refractor according to claim 4, characterized in that the other of the first and second segment lens element (33a, 33b) has a convex surface defined by an ellipse.
Claim 8
Dependent Claim
22 words
An optical refractor according to claims 1 to 3, characterized in that both segment lens elements (33a, 33b) have a spherical surface.
Claim 9
Dependent Claim
22 words
An optical refractor according to claim 7, characterized in that both segment lens element (33a, 33b) have convex surfaces of different curvature.
Claim 10
Dependent Claim
37 words
An optical refractor according to claims 1 to 7, characterized in that each of said second segment lens element (33b) have a light-transmitting section (Y) and a light-blocking section (X) covered with a light- shielding film (51).
Claim 11
Dependent Claim
37 words
An optical refractor according to claim 9, characterized in that said light-transmitting section (Y) of each second segment lens element (33b) is covered with a filter (52, 53, 54) for transmitting light rays of a specific wavelength.
Claim 12
Dependent Claim
38 words
An optical refractor according to claim 9, characterized in that said light-transmitting section (Y) of each second segment lens element is covered with a plurality of filter layers (52, 53, 54) for transmitting light rays of specific wavelengths.
Claim 13
Dependent Claim
27 words
An optical refractor according to claim 9, characterized in that said light-transmitting section (Y) of each second segment lens element (33b) diffuses light rays passing throught it.
References Cited (Backward Citations)
No citation records indexed.
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