US4949107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera having telescopic capability
Assignee: Canon Inc
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Filing: 1989-08-15
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Granted: 1990-08-14
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Expires: 2009-08-15
Abstract
Abstract A camera having a photographic lens and an eyepiece lens for observing an image formed by the photographic lens, wherein when this camera is used as a telescope, the interval between the image and the eyepiece lens is shortened, while simultaneously changing the focal length of the eyepiece lens, so that the magnification of the finder is increased.
Inventors
- 👤 Nozomu Kitagishi
- 👤 Takeshi Koyama
- 👤 Sadatoshi Takahashi
- 👤 Kouji Oizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:22
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; G03B13/10; G03B13/12; G02; G02B; G02B23/00; G02B23/14; G02B23/145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
62 words
A camera having a first mode and a second mode, comprising: objective lens means; eyepiece lens means for observing an image concerning light of said objective lens means; focal length altering means for changing a focal length of said eyepiece lens means and distance from the image to said eyepiece lens means to shift from said first mode to said second mode.
Claim 2
Dependent Claim
62 words
A camera having a first mode and a second mode, comprising: objective lens means; eyepiece lens means for observing an image concerning light of said objective lens means; focal length altering means for changing a focal length of said eyepiece lens means and distance from the image to said eyepiece lens means to shift from said first mode to said second mode.
Claim 3
Dependent Claim
28 words
A camera according to claim 1, wherein said first mode is an observation mode for photography preparation and said second mode is an observation mode for a telescope.
Claim 4
Dependent Claim
44 words
A camera according to claim 1 or 2, wherein to shift from said first mode to said second mode, said focal length altering means, while moving said objective lens means rearward along an optical axis, shortens the focal length of said eyepiece lens means.
Claim 5
Dependent Claim
53 words
A camera according to claim 1 or 2, wherein when shifting from said first mode to said second mode, said focal length altering means, while changing the focal length of said objective lens means to bring the image closer toward said eyepiece lens means, changes the focal length of said eyepiece lens means.
Claim 6
Dependent Claim
35 words
A camera according to claim 4, wherein said focal length altering means changes the image position by inserting an auxiliary lens having a negative refractive power to the image side of said objective lens means.
Claim 7
Dependent Claim
56 words
A camera according to claim 1 or 2, wherein to shift from said first mode to said second mode, said focal length altering means arranges an optical member between the image of said objective lens means and said eyepiece lens means to shorten an optical path and shortens the focal length of said eyepiece lens means.
Claim 8
Dependent Claim
17 words
A camera according to claim 1 or 2, wherein said objective lens means is a zoom lens.
Claim 9
Dependent Claim
31 words
A camera according to claim 7, wherein when zooming from the wide angle side to the telephoto side, the last lens group of said zoom lens moves to the object side.
Claim 10
Dependent Claim
39 words
A camera according to claim 8, wherein shifting from said first mode to said second mode, said focal length altering means moves said zoom lens of telephoto setting rearward and shortens the focal length of said eyepiece lens means.
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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |