US4673262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact finder
Assignee: Canon Inc
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Filing: 1984-12-04
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Granted: 1987-06-16
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Expires: 2004-12-04
Abstract
Abstract The disclosed finder includes an optical system having an optical axis and an image plane, an eyepiece lens conjugately arranged at the rear to observe the image plane, a plurality of lens units, and a reflecting mirror arranged between the successive two of the lens units, to obtain an erect image and to shorten the total finder length.
Inventors
- 👤 Sadahiko Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:00
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/16; G02B17/00; G02B17/02; G02B17/026; G02B23/00; G02B23/14; G02B27/14; G02B27/144
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
An eyepiece lens system for observing an image of an object comprising: an eyepiece lens including a plurality of lens units and having a frontmost surface and a rearmost surface; reflecting means having reflection surfaces to reflect light which passes a preceding one of said lens units to a next one of said lens unit; and a distance from the image of the object to the frontmost surface of the eyepiece lens along the optical axis being greater than a length of the frontmost surface to the rearmost surface of the eyepiece lens.
Claim 2
Dependent Claim
93 words
An eyepiece lens system for observing an image of an object comprising: an eyepiece lens including a plurality of lens units and having a frontmost surface and a rearmost surface; reflecting means having reflection surfaces to reflect light which passes a preceding one of said lens units to a next one of said lens unit; and a distance from the image of the object to the frontmost surface of the eyepiece lens along the optical axis being greater than a length of the frontmost surface to the rearmost surface of the eyepiece lens.
Claim 3
Dependent Claim
15 words
A system according to claim 1, wherein said eyepiece lens is composed of two lenses.
Claim 4
Dependent Claim
31 words
A device according to claim 1, wherein said lens units being three in number, and said reflecting means including a reflection surface arranged between each successive two of said lens units.
Claim 5
Dependent Claim
64 words
An eyepiece lens system comprising: an eyepiece lens including a plurality of lens units; reflecting means having reflection surfaces to reflect light which passes a preceding one of said lens units to a next one of said lens unit; and said lens units being three in number, and said reflecting means including a reflection surface arranged between each successive two of said lens units.
Claim 6
Dependent Claim
64 words
An eyepiece lens system comprising: an eyepiece lens including a plurality of lens units; reflecting means having reflection surfaces to reflect light which passes a preceding one of said lens units to a next one of said lens unit; and said lens units being three in number, and said reflecting means including a reflection surface arranged between each successive two of said lens units.
Claim 7
Dependent Claim
141 words
A photographic system comprising: (a) a photographic lens having an optical path; (b) image receiving means for receiving an image formed by said photographic lens; (c) an optical splitter between said photographic lens and said image receiving means to split off the optical path; (d) four reflection surfaces arranged along the split-off optical path successively; (e) a focusing screen arranged on the split-off optical path; (f) an eyepiece lens including a plurality of lens units for observing the image formed by said photographic lens and having a frontmost surface and a rearmost surface; (g) another reflection surface arranged between said lens units; and (h) a distance from said focusing screen to the frontmost surface of the eyepiece lens as measured along the optical axis being longer than the length from the frontmost surface to the rearmost surface of the eyepiece lens.
Claim 8
Dependent Claim
141 words
A photographic system comprising: (a) a photographic lens having an optical path; (b) image receiving means for receiving an image formed by said photographic lens; (c) an optical splitter between said photographic lens and said image receiving means to split off the optical path; (d) four reflection surfaces arranged along the split-off optical path successively; (e) a focusing screen arranged on the split-off optical path; (f) an eyepiece lens including a plurality of lens units for observing the image formed by said photographic lens and having a frontmost surface and a rearmost surface; (g) another reflection surface arranged between said lens units; and (h) a distance from said focusing screen to the frontmost surface of the eyepiece lens as measured along the optical axis being longer than the length from the frontmost surface to the rearmost surface of the eyepiece lens.
Claim 9
Dependent Claim
35 words
A photographic system according to claim 5, wherein said lens units are three in number, and first of said lens units lies on the optical splitter side of the last of said four reflection surfaces.
Claim 10
Dependent Claim
19 words
A photographic system as in claim 5, wherein said reflection surfaces reflect light successively in three mutually perpendicular directions.
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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |