US4616294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic flash device
Assignee: Canon Inc
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Filing: 1985-10-29
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Granted: 1986-10-07
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Expires: 2005-10-29
Abstract
Abstract Disclosed is a reflector for an electronic flash device capable of changing the illuminating angle. The reflector is nearly of elliptical shape as in the case of the conventional one, wherein the ratio of the longer diameter of the ellipse to the shorter one and the shorter diameter itself are set at special values. Thus, the reflector can be designed small, while the same illuminating angle as in a case where a wide angle adapter is mounted on the flash device can be obtained.
Inventors
- 👤 Yoshiharu Tenmyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:13
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/0517; G03B2215/0525; G03B2215/0528
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
An electronic flash device comprising: (a) reflector, said reflector being almost elliptical and represented by ##EQU4## where 2a is a longer diameter of the ellipse formed by said reflector and 2b is a shorter diameter of the ellipse formed by said reflector; and (b) supporting means for supporting said reflector at a predetermined position.
Claim 2
Dependent Claim
54 words
An electronic flash device comprising: (a) reflector, said reflector being almost elliptical and represented by ##EQU4## where 2a is a longer diameter of the ellipse formed by said reflector and 2b is a shorter diameter of the ellipse formed by said reflector; and (b) supporting means for supporting said reflector at a predetermined position.
Claim 3
Dependent Claim
46 words
An electronic flash device according to claim 1, further comprising: an optical system arranged in front of said reflector, said optical system including a plurality of parts having different focal lengths, in which the nearer the circumference of said optical system, the longer said focal lengths.
Claim 4
Dependent Claim
16 words
An electronic flash device according to claim 2, wherein said optical system is a Fresnel lens.
Claim 5
Dependent Claim
20 words
An electronic flash device according to claim 1, wherein said reflector is formed of metal having a heat radiating fin.
Claim 6
Dependent Claim
23 words
An electronic flash device according to claim 4, wherein said heat radiating fin is formed at the end portion of said metal reflector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |