US4217050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera with an image of exposure condition indicia visible through a view-finder thereof
Assignee: Canon Inc
•
Filing: 1977-08-05
•
Granted: 1980-08-12
•
Expires: 1997-08-05
Abstract
Abstract An optical system for forming a view-finder image in combination with an image of exposure condition indicia as applied to a cinematographic camera includes a first image plane at which a focusing screen lies with the exposure condition indicia located at a desired large distance from the finder field of view, and a prism positioned ahead of a second image plane at which both the images are erected, and oriented so that the image of the indicia can be seen immediately adjacent the finder field of view by a photographer looking through an ocular of the system.
Inventors
- 👤 Yasuhisa Sato
- 👤 Akira Tajima
- 👤 Yukiharu Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:36
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
An information display system for a photographic camera comprising: a photographic lens having a front lens group; light-reflecting means arranged behind said front lens group; a finder optical system facing said light-reflecting means and having a front image plane, a focusing means arranged on the front image plane, an imaging lens, a rear image plane and an ocular for observing said rear image plane in this order; data indicating means for supplying data on said front image plane; and refracting means positioned between said imaging lens and said rear image plane for shifting an image of said data on said rear image plane toward the optical axis of said finder optical system.
Claim 2
Dependent Claim
112 words
An information display system for a photographic camera comprising: a photographic lens having a front lens group; light-reflecting means arranged behind said front lens group; a finder optical system facing said light-reflecting means and having a front image plane, a focusing means arranged on the front image plane, an imaging lens, a rear image plane and an ocular for observing said rear image plane in this order; data indicating means for supplying data on said front image plane; and refracting means positioned between said imaging lens and said rear image plane for shifting an image of said data on said rear image plane toward the optical axis of said finder optical system.
Claim 3
Dependent Claim
13 words
A system according to claim 1, wherein said refracting means is a prism.
Claim 4
Dependent Claim
77 words
An information display system for a photographic camera comprising: a photographic system; a view finder system optically coupled to said photographic system and including a front image plane, an imaging lens means and an ocular in this order; information indicating means for projecting information beam through said imaging lens means and for forming visible information; and a prism positioned between said imaging lens and said rear image plane for deflecting said information beam into the visual field.
Claim 5
Dependent Claim
77 words
An information display system for a photographic camera comprising: a photographic system; a view finder system optically coupled to said photographic system and including a front image plane, an imaging lens means and an ocular in this order; information indicating means for projecting information beam through said imaging lens means and for forming visible information; and a prism positioned between said imaging lens and said rear image plane for deflecting said information beam into the visual field.
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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |