Patent US4725864A successfully refreshed from Google Patents.
US4725864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vari-focal camera
Assignee: Canon Inc
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Filing: 1985-10-16
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Granted: 1988-02-16
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Expires: 2005-10-16
Abstract
Abstract In a vari-focal camera which has a photo-taking optical system including a main lens system and an auxiliary lens system and is arranged to be shiftable between at least two different focal lengths by moving the photo-taking optical system back and forth on a photo-taking optical axis in such a way as to cause the auxiliary lens system to move onto and out of the optical axis, a guide bar is arranged to allow a lens barrel unit which includes the photo-taking optical system, a shutter and a photo-taking lens focusing device to straightly move. The guide bar is fittingly engaged with a member secured to a camera body. The camera is further provided with an adjusting member for focusing the photo-taking optical system in each of preset positions in which the photo-taking lens has the different focal lengths.
Inventors
- 👤 Yukio Ogawa
- 👤 Michio Hirohata
- 👤 Takanori Kodaira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:53
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04; G03B19/07
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
115 words
A vari-focal optical apparatus for a camera including: (A) a first optical system arranged to move along a photographic optical path; (B) a second optical system arranged to enter into, or exit from, the photographic optical path; (C) means for moving said first optical system along the photographic optical path and bringing or taking said second optical system into or out of the photographic optical path to change the focal length; and (D) first adjusting means for adjusting the standard focusing position when said second optical system is outside the photographic optical path; and (E) second adjusting means for adjusting the standard focusing position when said second optical system lies in the photographic optical path.
Claim 2
Dependent Claim
115 words
A vari-focal optical apparatus for a camera including: (A) a first optical system arranged to move along a photographic optical path; (B) a second optical system arranged to enter into, or exit from, the photographic optical path; (C) means for moving said first optical system along the photographic optical path and bringing or taking said second optical system into or out of the photographic optical path to change the focal length; and (D) first adjusting means for adjusting the standard focusing position when said second optical system is outside the photographic optical path; and (E) second adjusting means for adjusting the standard focusing position when said second optical system lies in the photographic optical path.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 1, wherein said second adjusting means includes one-side adjusting means for adjusting only said second optical system.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 1, wherein said second adjusting means includes both-side adjusting means for adjusting both said first and said second optical systems.
Claim 5
Dependent Claim
22 words
An apparatus according to claim 3, wherein said second adjusting means includes one-side adjusting means for adjusting only said second optical system.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1, further comprising a shutter which moves integrally with said first optical system along the photographic optical path.
Claim 7
Dependent Claim
37 words
An apparatus according to claim 1, wherein said first adjusting means and said second adjusting means are adjustable so as to prevent the movement stroke of the first optical system for changing the focal length from changing.
Claim 8
Dependent Claim
33 words
An apparatus according to claim 1, wherein the standard focusing position to be adjusted by said first adjusting means and said second adjusting means adjusts a focusing position for an infinity distance object.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 1, further comprising elastic means for biasing the second optical system toward entrance into the photographic optical path.
Claim 10
Dependent Claim
27 words
An apparatus according to claim 8, further comprising cam means for causing the second optical system to exit from the photographic optical path against the elastic means.
Claim 11
Dependent Claim
41 words
An apparatus according to claim 1, wherein at least one of said first adjusting means and said second adjusting means is adjustable so as to prevent the movement stroke of the first optical system for changing the focal length from changing.
Claim 12
Dependent Claim
37 words
An apparatus according to claim 1, wherein the standard focusing position to be adjusted by at least one of said first adjusting means and said second adjusting means adjusts a focusing position for an infinity distance object.
Claim 13
Dependent Claim
88 words
A vari-focal optical apparatus for a camera, including: (A) a first optical system for forming a photographic optical path; (B) a second optical system arranged upon entrance into or exit from said photographic optical path to change the focal length of said first optical system; (C) first adjusting means for adjusting the standard focusing position when said second optical system is outside the photographic optical path; and (D) second adjusting means for adjusting the standard focusing position when said second optical system lies in the photographic optical path.
Claim 14
Dependent Claim
88 words
A vari-focal optical apparatus for a camera, including: (A) a first optical system for forming a photographic optical path; (B) a second optical system arranged upon entrance into or exit from said photographic optical path to change the focal length of said first optical system; (C) first adjusting means for adjusting the standard focusing position when said second optical system is outside the photographic optical path; and (D) second adjusting means for adjusting the standard focusing position when said second optical system lies in the photographic optical path.
Claim 15
Dependent Claim
22 words
An apparatus according to claim 12, wherein said second adjusting means includes one-side adjusting means for adjusting only said second optical system.
Claim 16
Dependent Claim
25 words
An apparatus according to claim 12, wherein said second adjusting means includes both-side adjusting means for adjusting both said first and said second optical systems.
Claim 17
Dependent Claim
22 words
An apparatus according to claim 14, wherein said second adjusting means includes one-side adjusting means for adjusting only said second optical system.
Claim 18
Dependent Claim
33 words
An apparatus according to claim 12, wherein the standard focusing position to be adjusted by said first adjusting means and said second adjusting means adjusts a focusing position for an infinity distance object.
Claim 19
Dependent Claim
23 words
An apparatus according to claim 12, further comprising elastic means for biasing the second optical system toward entrance into the photographic optical path.
Claim 20
Dependent Claim
27 words
An apparatus according to claim 17, further comprising cam means for causing the second optical system to exit from the photographic optical path against the elastic means.
Claim 21
Dependent Claim
37 words
An apparatus according to claim 12, wherein the standard focusing position to be adjusted by at least one of said first adjusting means and said second adjusting means adjusts a focusing position for an infinity distance object.
Claim 22
Dependent Claim
87 words
A vari-focal optical apparatus for a camera, including: (A) a first optical system for forming a photographic optical path; (B) a second optical system arranged upon entrance into or exit from the photographic optical path to change the focal length of said first optical system between first and second values; (C) first adjusting means for adjusting the standard focusing position with the focal length at the first value; and (D) second adjusting means for adjusting the standard focusing position with the focal length at the second value.
Claim 23
Dependent Claim
87 words
A vari-focal optical apparatus for a camera, including: (A) a first optical system for forming a photographic optical path; (B) a second optical system arranged upon entrance into or exit from the photographic optical path to change the focal length of said first optical system between first and second values; (C) first adjusting means for adjusting the standard focusing position with the focal length at the first value; and (D) second adjusting means for adjusting the standard focusing position with the focal length at the second value.
Claim 24
Dependent Claim
22 words
An apparatus according to claim 20, wherein said second adjusting means includes one-side adjusting means for adjusting only said second optical system.
Claim 25
Dependent Claim
25 words
An apparatus according to claim 20, wherein said second adjusting means includes both-side adjusting means for adjusting both said first and said second optical systems.
Claim 26
Dependent Claim
22 words
An apparatus according to claim 22, wherein said second adjusting means includes one-side adjusting means for adjusting only said second optical system.
Claim 27
Dependent Claim
33 words
An apparatus according to claim 20, wherein the standard focusing position to be adjusted by said first adjusting means and said second adjusting means adjusts a focusing position for an infinity distance object.
Claim 28
Dependent Claim
23 words
An apparatus according to claim 20, further comprising elastic means for biasing the second optical system toward entrance into the photographic optical path.
Claim 29
Dependent Claim
27 words
An apparatus according to claim 25, further comprising cam means for causing the second optical system to exit from the photographic optical path against the elastic means.
Claim 30
Dependent Claim
37 words
An apparatus according to claim 20, wherein the standard focusing position to be adjusted by at least one of said first adjusting means and said second adjusting means adjusts a focusing position for an infinity distance object.
Claim 31
Dependent Claim
159 words
A vari-focal camera comprising: (A) a photo-taking optical system changeable between focal lengths, said photo-taking optical system including a first optical system movable back and forth along an optical axis and a second optical system for entering into and coming out of the optical axis; (B) a focal length change over device which moves said first optical system back and forth along said optical axis and at the same time has said second optical system enter into and come out of said optical axis, for changing said photo-taking optical system between a first focal length condition and a second focal length condition; (C) a first adjustment member for setting a reference focal point of said photo-taking optical system when said photo-taking optical system is in the first focal length condition; and (D) a second adjustment member for setting a reference focal point of said photo-taking optical system when said photo-taking optical system is in the second focal length condition.
Claim 32
Dependent Claim
159 words
A vari-focal camera comprising: (A) a photo-taking optical system changeable between focal lengths, said photo-taking optical system including a first optical system movable back and forth along an optical axis and a second optical system for entering into and coming out of the optical axis; (B) a focal length change over device which moves said first optical system back and forth along said optical axis and at the same time has said second optical system enter into and come out of said optical axis, for changing said photo-taking optical system between a first focal length condition and a second focal length condition; (C) a first adjustment member for setting a reference focal point of said photo-taking optical system when said photo-taking optical system is in the first focal length condition; and (D) a second adjustment member for setting a reference focal point of said photo-taking optical system when said photo-taking optical system is in the second focal length condition.
Claim 33
Dependent Claim
27 words
A camera according to claim 28, wherein said second adjustment member includes a member for adjusting said second optical system back and forth along said optical axis.
Claim 34
Dependent Claim
17 words
A camera according to claim 28, wherein said first and second adjustment members include an adjustment screw.
Claim 35
Dependent Claim
22 words
A camera according to claim 28, further comprising a shutter which moves integrally with the first optical system along the optical axis.
Claim 36
Dependent Claim
37 words
A camera according to claim 28, wherein said first adjustment member and said second adjustment member are adjustable so as to prevent the movement stroke of the first optical system for changing the focal length from changing.
Claim 37
Dependent Claim
31 words
A camera according to claim 28, wherein said reference focal point which is adjusted by said first and second adjustment members corresponds to a focusing position for an infinity distance object.
Claim 38
Dependent Claim
22 words
A camera according to claim 28, further comprising elastic means for biasing the second optical system toward entrance into the optical axis.
Claim 39
Dependent Claim
26 words
A camera according to claim 34, further comprising cam means for causing the second optical system to exit from the optical axis against the elastic means.
Claim 40
Dependent Claim
41 words
A camera according to claim 28, wherein at least one of said first adjustment member and said second adjustment member is adjustable so as to prevent the movement stroke of the first optical system for changing the focal length from changing.
Claim 41
Dependent Claim
36 words
A camera according to claim 28, wherein said reference focal point which is adjusted by at least one of said first and said second adjustment member corresponds to a focusing position for an infinity distance object.
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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |