US4707103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system of variable magnification
Assignee: Canon Inc
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Filing: 1986-02-12
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Granted: 1987-11-17
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Expires: 2006-02-12
Abstract
Abstract An optical system of variable magnification including an image forming lens system having at least one optical member axially movable for varying the image magnification, and a light beam splitting device in the optical path of the lens system, the optical member and the splitting device being arranged to move simultaneously.
Inventors
- 👤 Keiji Ikemori
- 👤 Takeshi Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/16; G02B15/177; G02B15/143; G02B15/1435; G02B15/143503; G02B23/00; G02B23/14; G02B23/145
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
50 words
An optical system comprising: an image forming zoom optical system having first optical means axially movable when zooming; and light beam splitting means for splitting an optical path of said image forming optical system, said light beam splitting means moving in response to a movement of said first optical means.
Claim 2
Dependent Claim
50 words
An optical system comprising: an image forming zoom optical system having first optical means axially movable when zooming; and light beam splitting means for splitting an optical path of said image forming optical system, said light beam splitting means moving in response to a movement of said first optical means.
Claim 3
Dependent Claim
31 words
An optical system according to claim 1, wherein said image forming zoom optical system has second optical means movable at the same time with, and independently of, said first optical means.
Claim 4
Dependent Claim
20 words
An optical system according to claim 2, wherein said second optical means moves in unison with said beam splitting means.
Claim 5
Dependent Claim
27 words
An optical system according to claim 1, wherein said image forming zoom optical system has third optical means on the image side of said beam splitting means.
Claim 6
Dependent Claim
20 words
An optical system according to claim 4, wherein said third optical means remains stationary when said first optical means moves.
Claim 7
Dependent Claim
25 words
An optical system according to claim 4, wherein said third optical means moves at the same time with and independently of said first optical means.
Claim 8
Dependent Claim
36 words
An optical system according to claim 1, wherein said image forming zoom optical system has a stop movable at the same time with said beam splitting means on the object side of said beam splitting means.
Claim 9
Dependent Claim
18 words
An optical system according to claim 7, wherein said stop moves in unison with said beam splitting means.
Claim 10
Dependent Claim
24 words
An optical system according to claim 1, wherein a view finder is arranged on the path of a split-off beam of said splitting means.
Claim 11
Dependent Claim
25 words
An optical system according to claim 1, wherein means for focus detection is arranged on the path of a split-off beam of said slitting means.
Claim 12
Dependent Claim
22 words
An optical system according to claim 10, wherein said means for focus detection has a light emitting element and a projection lens.
Claim 13
Independent Claim
92 words
An apparatus comprising: (a) an imaging optical system having optical means axially movable for varying a magnification of said imaging optical system; (b) splitting means for splitting at least a portion of a photo-taking light flux of said imaging optical system, said splitting means moving on the optical axis in response to a movement of said optical means; and (c) observation means for observing one of the light fluxes which has been split by said splitting means, wherein another one of the split light fluxes is imaged by said imaging optical system.
Claim 14
Independent Claim
92 words
An apparatus comprising: (a) an imaging optical system having optical means axially movable for varying a magnification of said imaging optical system; (b) splitting means for splitting at least a portion of a photo-taking light flux of said imaging optical system, said splitting means moving on the optical axis in response to a movement of said optical means; and (c) observation means for observing one of the light fluxes which has been split by said splitting means, wherein another one of the split light fluxes is imaged by said imaging optical system.
Claim 15
Dependent Claim
14 words
An apparatus according to claim 12, wherein said observation means images said light flux.
Claim 16
Dependent Claim
28 words
An apparatus according to claim 12, wherein said splitting means is moved in a manner that an imaging position of said observation means is in a predetermined position.
Claim 17
Dependent Claim
32 words
An apparatus according to claim 12, wherein said imaging optical system has an aperture diaphragm which independently moves in a same direction as that of said splitting means in an integral manner.
Claim 18
Dependent Claim
81 words
An apparatus according to claim 12, wherein said observation means has a reflectance member for reflecting a portion of the photo-taking light flux which has been split by said splitting means in a direction almost parallel to the optical axis of said imaging optical system, said reflectance member being integrally moved with said splitting means in varying the magnification and at the same time an imaging position of said observation image is positioned at an observation side of said reflectance member.
Claim 19
Dependent Claim
16 words
An apparatus acoording to claim 16, wherein said splitting means is positioned within said optical means.
Claim 20
Dependent Claim
43 words
An apparatus according to claim 17, wherein said optical means comprises lens groups and said splitting means is positioned at a part of the lens groups at an image plane side of the optical means, and is moved together with said lens groups.
Claim 21
Dependent Claim
34 words
An apparatus according to claim 12, further comprising a condenser lens positioned in the vicinity of an imaging position of said observation means so that an observation image is observed through said condenser lens.
Claim 22
Independent Claim
82 words
An apparatus comprising: (a) an imaging optical system having optical means axially movable for varying a magnification of said imaging optical system; (b) splitting means for splitting at least a portion of light flux of said imaging optical system, said splitting means moving in response to a movement of said optical means; and (c) detection means for detecting the light flux split by said splitting means thus producing information relating to a state of a focus adjustment of said imaging optical system.
Claim 23
Independent Claim
82 words
An apparatus comprising: (a) an imaging optical system having optical means axially movable for varying a magnification of said imaging optical system; (b) splitting means for splitting at least a portion of light flux of said imaging optical system, said splitting means moving in response to a movement of said optical means; and (c) detection means for detecting the light flux split by said splitting means thus producing information relating to a state of a focus adjustment of said imaging optical system.
Claim 24
Dependent Claim
17 words
An apparatus according to claim 20, wherein said splitting means constitutes a portion of said optical means.
Claim 25
Dependent Claim
32 words
An apparatus according to claim 20, wherein said splitting means has a dichroic plane which possesses a high transmittance in the visible beam region and a high reflectance in the infrared region.
Claim 26
Dependent Claim
32 words
An apparatus according to claim 20, further comprising an aperture diaphragm positioned at an object side of side splitting means, said aperture diaphragm moving in response to movement of said optical 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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |