EP0204572A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Light-emitting device for automatic focus adjustment apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1986-06-05
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Granted: —
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Expires: 2006-06-05
Abstract
Abstract In an automatic focus adjustment apparatus with a light-emitting device comprising a condenser lens (2) and a light-emitting element (1) which radiates light onto an object and adjusts the focal point according to light reflected back from the object, undesired flare is eliminated by placing a diaphragm (3a) sufficiently close to the light-emitting element (1) so that only the effective light from the element passes to the condenser lens by using a cap (3), an opaque paint (11) or a spatial filter (13), and/or by applying a low reflectance paint to the inner wall of an outer casing (5) of the light-emitting device.
Inventors
- 👤 Ryuichiro Kuga
- 👤 Yoshiaki Hirao
- 👤 Hiroyuki Asakura
- 👤 Yoshitomi Nagaoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 10:23
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/855
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A light-emitting device comprising: a light-emitting element (1) for emitting a light; a base (6) for mounting thereon said light-emitting element; an outer casing (5) for encasing therein said base and said light-emitting element; and means (3) for reducing flare light reflected from an inner wall of said case and a surface of said base.
Claim 2
Dependent Claim
55 words
A light-emitting device comprising: a light-emitting element (1) for emitting a light; a base (6) for mounting thereon said light-emitting element; an outer casing (5) for encasing therein said base and said light-emitting element; and means (3) for reducing flare light reflected from an inner wall of said case and a surface of said base.
Claim 3
Dependent Claim
41 words
A device according to claim 1, wherein said means comprises a cap (3) covering said outer casing (5), said cap having a center aperture (3a) for passing therethrough only the light emitted from said light- emitted from said light-emitting element (1).
Claim 4
Dependent Claim
67 words
A device according to claim 1 or 2, wherein said means comprises a cover glass (4) placed in front of said light-emitting element (1), an outer surface of said cover glass being coated with a low reflectance opaque paint (11) except a center aperture area thereof opposing to said light-emitting element (1) so that only the light emitted from said light-emitting element passes through said aperture area.
Claim 5
Dependent Claim
37 words
A device according to claim 1, 2 or 3, wherein said means comprises a low reflectance material (15) coated at least on the inner wall of said outer casing (5) or the surface of said base (6).
Claim 6
Dependent Claim
35 words
A device according to claim 1, wherein said means comprises a spatial filter (13, 14) placed in front of said light-emitting element (1) for passing therethrough only the light emitted from said light emitting element.
Claim 7
Dependent Claim
40 words
A device according to claim 5, wherein said spatial filter (13) comprises a plurality of semi-cone shields (13a, 13b, 13c), said light-emitting element (1) being placed at a position corresponding to an imaginary apex of each of said semi-cone shields.
Claim 8
Dependent Claim
39 words
A device according to claim 1, wherein said means comprises a part of said outer casing opposing to said light-emitting element (1), said part having a center aperture for passing therethrough only the light emitted from said light-emitting element.
Claim 9
Dependent Claim
25 words
A combination according to any one of the proceding claims of a light-emitting device for emitting and a_condenser lens (2) for collecting the emitted light.
Claim 10
Dependent Claim
52 words
A combination according to claim 8 when dependent on claim 2, wherein the diameter of said center aperture (3a) is larger than a solid angle of an imaginary cone defined by the diameter of said condenser lens (2) as a bottom and the center of said light-emitting element (1) as an apex.
Claim 11
Dependent Claim
57 words
A combination according to claim 8 when dependent on claim 3, wherein the diameter of said center aperture area of the paint coating (11) is larger than a solid angle of an imaginary cone defined by the diameter of said condenser lens (2) as a bottom and the center of said light-emitting element (1) as an apex.
Claim 12
Dependent Claim
51 words
A combination according to claim 8 when dependent on claim 7, wherein the diameter of said center aperture is larger than a solid angle of an imaginary cone defined by the diameter of said condenser lens (2) as a bottom and the center of said light-emitting element (1) as an apex.
References Cited (Backward Citations)
DE2209194A1
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US4013915A
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FR2335013A1
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DE2632462A1
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WO1982002800A1
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EP0137555A1
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