Patent US3590683A successfully refreshed from Google Patents.
US3590683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye level and breast level viewing selection finder system for single lens reflex camera
Assignee: Ricoh Co Ltd
•
Filing: 1969-05-26
•
Granted: 1971-07-06
•
Expires: 1989-05-26
Abstract
Abstract A finder system for single-lens reflex camera which can be arbitrarily switched from an eye-level to a breast-level or vice versa by extending a plane reflecting mirror into or retracting from the optical path in a pentaroof-type reflecting mirror of a finder optical system. Since the pentaroof-type reflecting mirror is used, said plane mirror for optical path changeover may be freely moved within the reflecting mirror. The finder of the present invention is more simple in construction and more compact in size as compared with a finder system incorporating a pentaroof-type prism.
Inventors
- 👤 Kenji Hiruma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:03
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
230 words
A finder system for a single lens reflex camera comprising: a hollow pentatype-roof reflecting mirror mounted within a housing of the camera and including a light entrance and a first light emerging opening; an eye-level eyepiece disposed adjacent said first light emerging opening; a first angularly positioned plane reflecting surface located within said hollow reflecting mirror and disposed opposite said light entrance; a second angularly positioned plane reflecting surface located within said hollow reflecting mirror and disposed adjacent said light entrance to reflect light from said first reflecting surface toward said eye-level eyepiece; a second light emerging opening located in said hollow reflecting mirror between said first and second reflecting surfaces; a frame portion integral with said housing and extending outwardly from said second light emerging opening; a waist-level eyepiece disposed within said frame portion adjacent said second light emerging opening; a lever having a plane reflecting mirror attached thereto, said lever pivotally mounted on said camera adjacent to said second light emerging opening; said lever being pivotal to a first position wherein said lever reflecting mirror extends into said frame portion allowing light entering said light entrance to be reflected into said eye-level eyepiece; and said lever being pivotal to a second position wherein said lever reflecting mirror extends between said first and second reflecting surfaces allowing light entering said light entrance to be reflected into said waist-level eyepiece.
Claim 2
Dependent Claim
230 words
A finder system for a single lens reflex camera comprising: a hollow pentatype-roof reflecting mirror mounted within a housing of the camera and including a light entrance and a first light emerging opening; an eye-level eyepiece disposed adjacent said first light emerging opening; a first angularly positioned plane reflecting surface located within said hollow reflecting mirror and disposed opposite said light entrance; a second angularly positioned plane reflecting surface located within said hollow reflecting mirror and disposed adjacent said light entrance to reflect light from said first reflecting surface toward said eye-level eyepiece; a second light emerging opening located in said hollow reflecting mirror between said first and second reflecting surfaces; a frame portion integral with said housing and extending outwardly from said second light emerging opening; a waist-level eyepiece disposed within said frame portion adjacent said second light emerging opening; a lever having a plane reflecting mirror attached thereto, said lever pivotally mounted on said camera adjacent to said second light emerging opening; said lever being pivotal to a first position wherein said lever reflecting mirror extends into said frame portion allowing light entering said light entrance to be reflected into said eye-level eyepiece; and said lever being pivotal to a second position wherein said lever reflecting mirror extends between said first and second reflecting surfaces allowing light entering said light entrance to be reflected into said waist-level eyepiece.
Claim 3
Dependent Claim
42 words
A finder system according to claim 1, in which said lever reflecting mirror is attached transversely to a free end of said lever whereby in said first position said lever reflecting mirror and part of said lever extend into said frame portion.
Claim 4
Dependent Claim
46 words
A finder system according to claim 1, in which said lever is formed as a receiving frame in which said lever reflecting mirror is mounted in flush relation whereby in said first position said lever and flush reflecting mirror substantially close said second light emerging opening.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |