US4453824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable magnification copying apparatus
Assignee: Canon Inc
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Filing: 1982-08-04
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Granted: 1984-06-12
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Expires: 2002-08-04
Abstract
Abstract A variable magnification copying apparatus capable of not only one-to-one magnification copying but also reduction copying, and particularly a variable magnification copying apparatus of the slit exposure scanning type which is capable of two or more types of reduction copying and which uses two movable mirrors and an in-mirror lens on the object side, characterized in that the optical axis of the in-mirror lens is set non-parallel to an original carriage to make the apparatus compact and during magnification change, the in-mirror lens and the second movable mirror are initially displaced by predetermined distances in predetermined directions, whereby the object point position and image point position of an image forming principal light ray on the original supporting surface and photosensitive surface are made fixed irrespective of the copying magnification.
Inventors
- 👤 Hiroyuki Miyake
- 👤 Seiji Sagara
- 👤 Kazuo Kagiura
- 👤 Nobukazu Sasaki
- 👤 Takaji Yonemori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
174 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, and a second movable mirror holding member and an in-mirror lens holding member supporting thereon said second movable mirror and said in-mirror lens, respectively, and displaceable by predetermined amounts in predetermined directions during a magnification change such that the object point position of a principal light ray on said original carriage is maintained fixed and a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens irrespective of the magnification change while the principal light ray at the object side is inclined with the change in magnification.
Claim 2
Dependent Claim
174 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, and a second movable mirror holding member and an in-mirror lens holding member supporting thereon said second movable mirror and said in-mirror lens, respectively, and displaceable by predetermined amounts in predetermined directions during a magnification change such that the object point position of a principal light ray on said original carriage is maintained fixed and a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens irrespective of the magnification change while the principal light ray at the object side is inclined with the change in magnification.
Claim 3
Dependent Claim
98 words
A variable magnification copying apparatus according to claim 1, wherein during a magnification change, said in-mirror lens is displaced by l in the direction of its optical axis and by m in the direction perpendicular to the surface of said original carriage and at right angles to said optical axis and wherein ##EQU13## where f is the focal length, ψ is the angle formed by the optical axis of said in-mirror lens with the surface of said original carriage, θ is the angle of incidence of the image forming principal light ray, and γ is the copying magnification.
Claim 4
Dependent Claim
66 words
A variable magnification copying apparatus according to claim 2, wherein during a magnification change, said in-mirror lens is displaced by Z in the lengthwise direction of a slit and wherein ##EQU14## where h is the distance in the lengthwise direction of the slit between the optical axis of the lens and the side edge of an original during one-to-one magnification, and γ is the copying magnification.
Claim 5
Dependent Claim
223 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, an in-mirror lens holding member holding said in-mirror lens, a rectilinear slide rail for rectilinearly moving a predetermined end of said in-mirror lens holding member, a position adjusting cam plate for correcting the optical position of said in-mirror lens by sliding movement of the predetermined other end of said in-mirror lens holding member, and a second movable mirror holding member and an in-mirror lens holding member for displacing said second movable mirror and said in-mirror lens by predetermined amounts in predetermined directions during magnification change such that the object point position of a principal light ray on said original carriage is maintained fixed and a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens irrespective of the magnification change while the principal light ray at the object side is inclined with the change in magnification.
Claim 6
Dependent Claim
223 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, an in-mirror lens holding member holding said in-mirror lens, a rectilinear slide rail for rectilinearly moving a predetermined end of said in-mirror lens holding member, a position adjusting cam plate for correcting the optical position of said in-mirror lens by sliding movement of the predetermined other end of said in-mirror lens holding member, and a second movable mirror holding member and an in-mirror lens holding member for displacing said second movable mirror and said in-mirror lens by predetermined amounts in predetermined directions during magnification change such that the object point position of a principal light ray on said original carriage is maintained fixed and a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens irrespective of the magnification change while the principal light ray at the object side is inclined with the change in magnification.
Claim 7
Dependent Claim
189 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, an in-mirror lens holding member holding said in-mirror lens, a positioning pin fixed to said in-mirror lens holding member, and a positioning plate for causing said positioning pin to fit in a predetermined position corresponding to each magnification to maintain the object point position of a principal light ray on said original carriage fixed during magnification, said positioning plate partly having a bent portion and a cam profile, wherein irrespective of a change in magnifixation a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens while the principal light ray at the object side is inclined with the change in magnification.
Claim 8
Dependent Claim
189 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, an in-mirror lens holding member holding said in-mirror lens, a positioning pin fixed to said in-mirror lens holding member, and a positioning plate for causing said positioning pin to fit in a predetermined position corresponding to each magnification to maintain the object point position of a principal light ray on said original carriage fixed during magnification, said positioning plate partly having a bent portion and a cam profile, wherein irrespective of a change in magnifixation a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens while the principal light ray at the object side is inclined with the change in magnification.
Claim 9
Dependent Claim
75 words
A variable magnification copying apparatus according to claim 5, wherein during a first magnification change, said positioning pin is spaced apart from said positioning plate by said bent portion of said positioning plate and slides on the side surface of said positioning plate and is controlled to a predetermined position and during a second magnification change, said positioning pin slides along the cam profile of said positioning plate and is controlled to a predetermined position.
Claim 10
Dependent Claim
29 words
A variable magnification copying apparatus according to claim 6, wherein one end of said positioning plate is fixed and the other end thereof is fluctuant by an expansible member.
Claim 11
Dependent Claim
244 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, a one-way rotation common drive source used for the displacement of said second movable mirror and said in-mirror lens, a driving cam, a rocking plate and a driving lever for imparting a drive force to said second movable mirror, a driving cam, a rocking plate and a driving lever for imparting a drive force to said in-mirror lens, a positioning plate for controlling the positions of said second movable mirror and said in-mirror lens to maintain the object point position of a principal light ray on said original carriage fixed during magnification, and a microswitch provided at a position corresponding to the rotation of said driving cam and adapted to cut off the drive force after the position control by said positioning plate, wherein irrespective of a change in magnification a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens while the principal light ray at the object side is inclined with the change in magnification.
Claim 12
Dependent Claim
244 words
A variable magnification copying apparatus comprising an original carriage, a first movable mirror movable parallel to said original carriage at a velocity V and located at the object side and in the vicinity of said original carriage in the optical path, a second movable mirror movable at a velocity (1/2)V in the same direction as said first movable mirror and remote from said original carriage in the optical path, an in-mirror lens having its optical axis non-parallel to said original carriage, a one-way rotation common drive source used for the displacement of said second movable mirror and said in-mirror lens, a driving cam, a rocking plate and a driving lever for imparting a drive force to said second movable mirror, a driving cam, a rocking plate and a driving lever for imparting a drive force to said in-mirror lens, a positioning plate for controlling the positions of said second movable mirror and said in-mirror lens to maintain the object point position of a principal light ray on said original carriage fixed during magnification, and a microswitch provided at a position corresponding to the rotation of said driving cam and adapted to cut off the drive force after the position control by said positioning plate, wherein irrespective of a change in magnification a constant angle is maintained between said original carriage and the optical axis of said in-mirror lens while the principal light ray at the object side is inclined with the change in magnification.
Claim 13
Dependent Claim
24 words
A variable magnification copying apparatus according to claim 8, wherein said rocking plates and said driving levers are coupled together by an expansible member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |