Patent US4165167A successfully refreshed from Google Patents.
US4165167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera
Assignee: Pentacon GmbH Foto und Feinwerktechnik
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Filing: 1977-06-24
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Granted: 1979-08-21
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Expires: 1997-06-24
Abstract
Abstract A viewfinder and exposure factor indicator system for photographic cameras comprising an indicator panel, a micro-luminous element for illuminating said panel, and a reproduction system arranged between the luminous element and the indicator panel. The image of said luminous element can be reproduced at the exit of said viewfinder system.
Inventors
- 👤 Rolf Jurenz
- 👤 Claus Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
In a camera having a viewfinder and exposure factor indicator system and including a roof prism, a field lens, an eyepiece, an indicator panel carrying exposure factor markings, and a luminous element which illuminates the indicator panel uniformly, the provision of an image reproduction system adjacent the indicator panel, the indicator panel being located between said system and the roof prism, which system transmits therethrough the light ray from the luminous element to the roof prism so as to reproduce the exposure factor markings and an image of the luminous element visible to the observer of the viewfinder, said reproduction system having a reflecting surface arranged to reflect the light from the luminous element into the roof prism.
Claim 2
Dependent Claim
118 words
In a camera having a viewfinder and exposure factor indicator system and including a roof prism, a field lens, an eyepiece, an indicator panel carrying exposure factor markings, and a luminous element which illuminates the indicator panel uniformly, the provision of an image reproduction system adjacent the indicator panel, the indicator panel being located between said system and the roof prism, which system transmits therethrough the light ray from the luminous element to the roof prism so as to reproduce the exposure factor markings and an image of the luminous element visible to the observer of the viewfinder, said reproduction system having a reflecting surface arranged to reflect the light from the luminous element into the roof prism.
Claim 3
Dependent Claim
19 words
A camera according to claim 1 wherein said system is disposed between the luminous element and said indicator panel.
Claim 4
Dependent Claim
28 words
A camera according to claim 1 in which the prism is formed with a bevelled off side face wherein said system is disposed against said bevelled-off side face.
Claim 5
Dependent Claim
119 words
In a camera having a viewfinder and an exposure factor indicator system and including a roof prism, a field lens, an eyepiece, an indicator panel carrying exposure factor markings, and a luminous element which illuminates the indicator panel uniformly, the provision of an image reproduction system adjacent the prism, the reproduction system being located between said indicator panel and said roof prism, which system transmits therethrough the light ray from the luminous element to the roof prism so as to reproduce the exposure factor markings and an image of the luminous element visible to the observer of the viewfinder, said reproduction system having a reflecting surface arranged to reflect the light from the luminous element into the roof prism.
Claim 6
Dependent Claim
119 words
In a camera having a viewfinder and an exposure factor indicator system and including a roof prism, a field lens, an eyepiece, an indicator panel carrying exposure factor markings, and a luminous element which illuminates the indicator panel uniformly, the provision of an image reproduction system adjacent the prism, the reproduction system being located between said indicator panel and said roof prism, which system transmits therethrough the light ray from the luminous element to the roof prism so as to reproduce the exposure factor markings and an image of the luminous element visible to the observer of the viewfinder, said reproduction system having a reflecting surface arranged to reflect the light from the luminous element into the roof prism.
Claim 7
Dependent Claim
34 words
A camera according to claim 4, wherein the image reproduction system is positioned against a surface of the roof prism which surface is on the opposite side of the roof prism to the eyepiece.
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) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |