Patent US4143468A successfully refreshed from Google Patents.
US3599545A
Expired / Lapsed
US
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Photographic camers with electronic exposure control
Assignee: Agfa Gevaert AG
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Filing: 1970-02-03
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Granted: 1971-08-17
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Expires: 1990-02-03
Abstract
Abstract A photographic camera with electronic exposure control and an exposure time indicator. A time scale is arranged along the length of an elongated light source which provides light at uniform intensity and as a function of the brightness condition prevailing at the object to be photographed. The light intensity of the source is varied through a photosensitive element in the electronic exposure control unit. A light attenuating member in the form of a wedge-shaped element in front of the light source extends along the length of the timing scale and provides attenuation which varies continuously in a progressive manner from one end of the wedge-shaped element to the other. A glass member with interference layers and illuminated from an auxiliary light source, is arranged to provide more precise indicating results.
Inventors
- 👤 Helmut Durr
- 👤 George Klepek
- 👤 Rainer Vesper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:52
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
A photographic camera with electronic exposure control means comprising, in combination, at least one uniform elongated light source with light intensity dependent on the brightness condition prevailing at the object to be photographed; scale means in proximity to said light source and extending in length corresponding to the length of said light source; and light attenuating means in front of said light source and extending substantially along the length of said light source, said attenuating means having an attenuating characteristic varying along the length of said attenuating element.
Claim 2
Dependent Claim
88 words
A photographic camera with electronic exposure control means comprising, in combination, at least one uniform elongated light source with light intensity dependent on the brightness condition prevailing at the object to be photographed; scale means in proximity to said light source and extending in length corresponding to the length of said light source; and light attenuating means in front of said light source and extending substantially along the length of said light source, said attenuating means having an attenuating characteristic varying along the length of said attenuating element.
Claim 3
Dependent Claim
16 words
The photographic camera as defined in claim 1 including indicating means for indicating the exposure time.
Claim 4
Dependent Claim
30 words
The photographic camera as defined in claim 1 wherein said light source and said scale means as well as said light attenuating means are within the finder of said camera.
Claim 5
Dependent Claim
27 words
The photographic camera as defined in claim 1 wherein said attenuating characteristic varies increasingly from one end of said light attenuating means to the other end thereof.
Claim 6
Dependent Claim
29 words
The photographic camera as defined in claim 1 wherein said light source comprises at least two lamps and diffusing surface means corresponding to the length of said scale means.
Claim 7
Dependent Claim
26 words
The photographic camera as defined in claim 1 wherein said light source comprises a lamp and light rod means arranged parallel to said light attenuating means.
Claim 8
Dependent Claim
17 words
The photographic camera as defined in claim 1 wherein said light source comprises a rod-shaped diffused lamp.
Claim 9
Dependent Claim
23 words
The photographic camera as defined in claim 1 wherein said light attenuating means comprises a wedge-shaped element with continuously varying light attenuation characteristics.
Claim 10
Dependent Claim
30 words
The photographic camera as defined in claim 1 wherein said light attenuating means comprises a wedge-shaped element having light attenuation characteristic varying in a stepwise manner along said wedge-shaped element.
Claim 11
Dependent Claim
21 words
The photographic camera as defined in claim 1 wherein said scale means is located in front of said light attenuating means.
Claim 12
Dependent Claim
19 words
The photographic camera as defined in claim 1 wherein said scale means is arranged above said light attenuating means.
Claim 13
Dependent Claim
19 words
The photographic camera as defined in claim 1 wherein said scale means is arranged below said light attenuating means.
Claim 14
Dependent Claim
22 words
The photographic camera as defined in claim 1 including auxiliary light source means for illuminating said scale means with constant light intensity.
Claim 15
Dependent Claim
48 words
The photographic camera as defined in claim 1 including photosensitive means within said electronic exposure control means and connected to said light source means for varying the intensity of light from said light source as a function of said brightness condition prevailing at said object to be photographed.
Claim 16
Dependent Claim
71 words
The photographic camera as defined in claim 1 including glass means with interference layers in proximity to said light attenuating means; a source of auxiliary light for illuminating said glass means so that a change in visible color takes place on said glass means at a location of said glass means where the light intensity from said elongated light source and said auxiliary source of light are equal in light intensity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |