Patent US4969723A successfully refreshed from Google Patents.
US4969723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallax adjusting mechanism for a finder device
Assignee: Canon Inc
•
Filing: 1988-12-09
•
Granted: 1990-11-13
•
Expires: 2008-12-09
Abstract
Abstract In an external-measured real image type finder optical system having a prism for a non-reverse erecting image interposed in between an objective lens system and an eyepiece lens system, parallax correction is accomplished by adjusting the position of at least a part of the objective lens system within a plane perpendicular to the optical axis of the finder optical system.
Inventors
- 👤 Masatake Kato
- 👤 Makoto Sekita
- 👤 Kenichi Kawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:32
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; G03B13/10; G03B13/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
A camera including a real image type finder device, said finder comprising: an objective lens having a positive refractive power; an eyepiece lens for sighting an image formed by said objective lens; a lens barrel; a holding frame for holding at least one lens constituting said objective lens; a spring located between said lens barrel and said holding frame for exerting a force against said holding frame in a first direction vertical to an optical axis of said objective lens; a member of preselected size being located between said lens barrel and said holding frame in opposition to the force of said spring to set a position of said lens relative to the first direction; and a guide member provided on said lens barrel and extending in a second direction which is vertical to the optical axis of said objective lens and vertical to said first direction to guide said holding frame in said second direction, whereby said holding frame is adjustable to position said objective lens to correct for parallax in a field of said finder device.
Claim 2
Dependent Claim
178 words
A camera including a real image type finder device, said finder comprising: an objective lens having a positive refractive power; an eyepiece lens for sighting an image formed by said objective lens; a lens barrel; a holding frame for holding at least one lens constituting said objective lens; a spring located between said lens barrel and said holding frame for exerting a force against said holding frame in a first direction vertical to an optical axis of said objective lens; a member of preselected size being located between said lens barrel and said holding frame in opposition to the force of said spring to set a position of said lens relative to the first direction; and a guide member provided on said lens barrel and extending in a second direction which is vertical to the optical axis of said objective lens and vertical to said first direction to guide said holding frame in said second direction, whereby said holding frame is adjustable to position said objective lens to correct for parallax in a field of said finder device.
References Cited (Backward Citations)
AT47506B
Cited
US1358721A
Cited
US3011403A
Cited
US3222987A
Cited
US3719132A
Cited
JPS4719028U
Cited
US3774994A
Cited
US4526444A
Cited
US4763998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |