US5245375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finder optical system
Assignee: Nikon Corp
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Filing: 1992-11-30
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Granted: 1993-09-14
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Expires: 2012-11-30
Abstract
Abstract In a finder optical system wherein a field frame and a field lens are placed near an objective lens and a real image plane made by the objective lens and a prism having a reflecting surface is disposed between the field frame and an eyepiece, a transmitting surface substantially perpendicular to the optical axis of reflected light reflected by the reflecting surface of the prism is provided on the reflecting surface of the prism or by cutting away the reflecting surface, and an information display system for displaying desired information through that transmitting surface is provided. The information display system is provided at a position optically symmetrical with the field frame.
Inventors
- 👤 Koichi Ohshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:03
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; G03B13/06; G03B13/08; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
107 words
A finder optical system including: an objective lens; a field frame and a field lens disposed near a real image plane made by said objective lens; an eyepiece for observing therethrough an object image formed on the real image plane made by said objective lens; an erect prism having a plurality of reflecting surfaces and disposed between said field frame and said eyepiece; a transmitting surface provided on a first one of said plurality of reflecting surfaces of said prism substantially perpendicularly to the optical axis of reflected light from said one reflecting surface; and an information display system for displaying desired information through said transmitting surface.
Claim 2
Dependent Claim
107 words
A finder optical system including: an objective lens; a field frame and a field lens disposed near a real image plane made by said objective lens; an eyepiece for observing therethrough an object image formed on the real image plane made by said objective lens; an erect prism having a plurality of reflecting surfaces and disposed between said field frame and said eyepiece; a transmitting surface provided on a first one of said plurality of reflecting surfaces of said prism substantially perpendicularly to the optical axis of reflected light from said one reflecting surface; and an information display system for displaying desired information through said transmitting surface.
Claim 3
Dependent Claim
23 words
A finder optical system according to claim 1, wherein said transmitting surface is protrudedly provided on a portion of said one reflecting surface.
Claim 4
Dependent Claim
35 words
A finder optical system according to claim 1, wherein said information display system has an information display member provided at a position optically symmetrical with the field frame with respect to said one reflecting surface.
Claim 5
Dependent Claim
18 words
A finder optical system according to claim 3, wherein said information display member includes an information display frame.
Claim 6
Dependent Claim
18 words
A finder optical system according to claim 3, wherein said information display member includes a light emitting diode.
Claim 7
Dependent Claim
114 words
A finder optical system including: an objective lens; a field frame and a field lens disposed near a real image plane made by said objective lens; an eyepiece for observing therethrough an object image formed on the real image plane made by said objective lens; a prism means for erecting the image, said prism means having a plurality of reflecting surfaces and disposed between said field frame and said eyepiece; a transmitting surface provided on a first one of said plurality of reflecting surfaces of said prism substantially perpendicularly to the optical axis of reflected light from said one reflecting surface; and an information display system for displaying desired information through said transmitting surface.
Claim 8
Dependent Claim
114 words
A finder optical system including: an objective lens; a field frame and a field lens disposed near a real image plane made by said objective lens; an eyepiece for observing therethrough an object image formed on the real image plane made by said objective lens; a prism means for erecting the image, said prism means having a plurality of reflecting surfaces and disposed between said field frame and said eyepiece; a transmitting surface provided on a first one of said plurality of reflecting surfaces of said prism substantially perpendicularly to the optical axis of reflected light from said one reflecting surface; and an information display system for displaying desired information through said transmitting surface.
Claim 9
Dependent Claim
23 words
A finder optical system according to claim 6, wherein said transmitting surface is protrudedly provided on a portion of said one reflecting surface.
Claim 10
Dependent Claim
35 words
A finder optical system according to claim 6, wherein said information display system has an information display member provided at a position optically symmetrical with the field frame with respect to said one reflecting surface.
Claim 11
Dependent Claim
18 words
A finder optical system according to claim 8, wherein said information display member includes an information display frame.
Claim 12
Dependent Claim
18 words
A finder optical system according to claim 8, wherein said information display member includes a light emitting diode.
Claim 13
Dependent Claim
106 words
A finder optical system including: an objective lens; a field frame and a field lens disposed near a real image plane made by said objective lens; an eyepiece for observing therethrough an object image formed on the real image plane made by said objective lens; a prism having a plurality of reflecting surfaces and disposed between said field frame and said eyepiece; a transmitting surface provided on a first one of said plurality of reflecting surfaces of said prism substantially perpendicularly to the optical axis of reflected light from said one reflecting surface; and an information display system for displaying desired information through said transmitting surface.
Claim 14
Dependent Claim
106 words
A finder optical system including: an objective lens; a field frame and a field lens disposed near a real image plane made by said objective lens; an eyepiece for observing therethrough an object image formed on the real image plane made by said objective lens; a prism having a plurality of reflecting surfaces and disposed between said field frame and said eyepiece; a transmitting surface provided on a first one of said plurality of reflecting surfaces of said prism substantially perpendicularly to the optical axis of reflected light from said one reflecting surface; and an information display system for displaying desired information through said transmitting surface.
Claim 15
Dependent Claim
23 words
A finder optical system according to claim 1, wherein said transmitting surface is protrudedly provided on a portion of said one reflecting surface.
Claim 16
Dependent Claim
35 words
A finder optical system according to claim 11, wherein said information display system has an information display member provided at a position optically symmetrical with the field frame with respect to said one reflecting surface.
Claim 17
Dependent Claim
18 words
A finder optical system according to claim 13, wherein said information display member includes an information display frame.
Claim 18
Dependent Claim
18 words
A finder optical system according to claim 13, wherein said information display member includes a light emitting diode.
References Cited (Backward Citations)
US4833494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-13 | 1997-03-15 | 1997-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-13 | 2001-03-15 | 2001-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-13 | 2005-03-15 | 2005-09-14 | $7700.00 | Window Closed / Lapsed |