Patent US5041994A successfully refreshed from Google Patents.
Patent US5081480A successfully refreshed from Google Patents.
US5081480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Finder of camera having macro-photographing function
Assignee: Pentax Corp
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Filing: 1991-02-14
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Granted: 1992-01-14
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Expires: 2011-02-14
Abstract
Abstract A finder device for a camera having a photographing optical system, a finder optical system independent therefrom, and having a macro-photographing mode. The finder includes at least one variable power lens which is provided in the finder optical system to vary the magnification thereof, and a field magnification varying device which moves the variable power lens in a direction to decrease the magnification upon transfer to the macro-photographing mode.
Inventors
- 👤 Tetsuya Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:51
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; G03B13/10; G03B13/14; G02; G02B; G02B23/00; G02B23/14; G02B23/145
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
79 words
A finder device for a camera having a photographing optical system and a finder optical system independent from the photographic optical system and having a macro-photographing mode, wherein said finder comprises: at least one variable power lens which is provided in said finder optical system to vary the magnification of the finder optical system; and, a field magnification varying device which moves said variable power lens in a direction to decrease the magnification upon transfer to said macro-photographing mode.
Claim 2
Dependent Claim
79 words
A finder device for a camera having a photographing optical system and a finder optical system independent from the photographic optical system and having a macro-photographing mode, wherein said finder comprises: at least one variable power lens which is provided in said finder optical system to vary the magnification of the finder optical system; and, a field magnification varying device which moves said variable power lens in a direction to decrease the magnification upon transfer to said macro-photographing mode.
Claim 3
Dependent Claim
32 words
A finder according to claim 1, further comprising a macro-photographing range indicating frame which is provided in said finder optical system to indicate a macro-photographing range upon transfer to said macro-photographing mode.
Claim 4
Dependent Claim
33 words
A finder according to claim 2, wherein said macrophotographing mode comprises a plurality of macro-photographing modes in which said field magnification varying device provides different values of magnification of said finder optical system.
Claim 5
Dependent Claim
25 words
A finder according to claim 3, wherein said macro-photographing frame comprises a plurality of frames having different sizes corresponding to the different values of magnification.
Claim 6
Dependent Claim
24 words
A finder according to claim 3, wherein said magnification of said finder optical system decreases as the magnification of said photographing optical system increases.
Claim 7
Dependent Claim
42 words
A finder according to claim 1, wherein said finder optical system comprises a real image type finder device having an objective optical system and an eye piece optical system through which an image formed by said objective optical system can be observed.
Claim 8
Dependent Claim
27 words
A finder according to claim 6, further comprising a field frame plate on an image plane on which an image is formed by said objective optical system.
Claim 9
Dependent Claim
32 words
A finder according to claim 7, further comprising a macro-photographing range indicating frame which is provided on said field frame plate to indicate a macro-photographing range upon transfer to said macro-photographing mode.
Claim 10
Dependent Claim
27 words
A finder according to claim 8, wherein said objective optical system comprises a pair of variable power lenses which vary said magnification of said finder optical system.
Claim 11
Dependent Claim
25 words
A finder according to claim 1, wherein the variable power lens moves to correct a diopter of said finder optical system at said macro-photographing mode.
Claim 12
Dependent Claim
34 words
A finder according to claim 10, wherein said diopter is corrected at said macro-photographing mode so that a photographer looks at a portion located closer than a reference distance of a normal zooming mode.
Claim 13
Dependent Claim
91 words
A camera comprising: a zoom-photographing optical system; a zoom finder optical system which varies the field of view in accordance with a zoom-photographing range of said zoom-photographing optical system; said zoom-photographing optical system having a macro-photographing mode at which a picture can be taken at a closer object distance than a normal zoom-photographing range; and, a field magnification varying device which varies the magnification of said zoom finder optical system to a value smaller than that in the zoom-photographing range upon transfer of said zoom-photographing optical system to said macro-photographing mode.
Claim 14
Dependent Claim
91 words
A camera comprising: a zoom-photographing optical system; a zoom finder optical system which varies the field of view in accordance with a zoom-photographing range of said zoom-photographing optical system; said zoom-photographing optical system having a macro-photographing mode at which a picture can be taken at a closer object distance than a normal zoom-photographing range; and, a field magnification varying device which varies the magnification of said zoom finder optical system to a value smaller than that in the zoom-photographing range upon transfer of said zoom-photographing optical system to said macro-photographing mode.
Claim 15
Dependent Claim
32 words
A camera according to claim 12, further comprising a macro-photographing range indicating frame which is provided in said finder optical system to indicate a macro-photographing range upon transfer to said macro-photographing mode.
Claim 16
Dependent Claim
34 words
A camera according to claim 12, wherein said macro-photographing mode comprises a plurality of macro-photographing modes in which said field magnification varying device provides different values of magnification of said zoom finder optical system.
Claim 17
Dependent Claim
22 words
A camera according to claim 14, wherein said macro-photographing frame comprises a plurality of frames having different sizes corresponding to the magnifications.
Claim 18
Dependent Claim
26 words
A camera according to claim 12, wherein said magnification of said zoom finder optical system decreases as the magnification of said zoom photographing optical system increases.
Claim 19
Dependent Claim
25 words
A camera according to claim 12, wherein said zoom-photographing optical system moves from a focal length extremity on a telephoto side to said macro-photographing mode.
Claim 20
Dependent Claim
44 words
A camera according to claim 17, wherein said field magnification varying device of said zoom finder optical system varies the field magnification to a value smaller than that at the telephoto extremity thereof upon transfer of said zoom-photographing optical system to the macro-photographing mode.
Claim 21
Dependent Claim
28 words
A camera according to claim 12, wherein said zoom finder optical system includes a pair of variable power lenses which vary the magnification of the finder optical system.
Claim 22
Dependent Claim
28 words
A finder according to claim 19, wherein said pair of variable power lenses move to correct a diopter of said zoom finder optical system at said macro-photographing mode.
Claim 23
Dependent Claim
34 words
A camera according to claim 20, wherein said diopter is corrected at said macro-photographing mode so that a photographer looks at a portion located closer than a reference distance of a normal zooming mode.
References Cited (Backward Citations)
US2737844A
Cited
US4000501A
Cited
US4336985A
Cited
WO1987007038A1
Cited
US4944030A
Cited
US4944030B1
Cited
US4967219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |