US4624555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slit exposure projection device
Assignee: Canon Inc
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Filing: 1985-09-12
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Granted: 1986-11-25
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Expires: 2005-09-12
Abstract
Abstract A slit exposure projection device having a projection optical system and/or an aperture stop designed such that the pupil of the projection optical system in the longitudinal direction of the slit is large relative to the pupil in the lateral direction of the slit.
Inventors
- 👤 Mitsuhiro Tokuhara
- 👤 Hiroshi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
A slit exposure projection device comprising: means for confining a light flux reaching a photo-receiving plane to a slit shape; and a focusing optical system having a pupil which is large in a longitudinal direction of the slit so that a quantity of the light flux is sufficiently large, and which is smaller in a lateral direction of the slit than in the longitudinal direction of the slit, said focusing optical system focusing the light flux onto said photo-receiving plane.
Claim 2
Dependent Claim
80 words
A slit exposure projection device comprising: means for confining a light flux reaching a photo-receiving plane to a slit shape; and a focusing optical system having a pupil which is large in a longitudinal direction of the slit so that a quantity of the light flux is sufficiently large, and which is smaller in a lateral direction of the slit than in the longitudinal direction of the slit, said focusing optical system focusing the light flux onto said photo-receiving plane.
Claim 3
Dependent Claim
31 words
A slit exposure projection device according to claim 1, wherein said focusing optical system is of a circular shape having peripheries thereof cut off in the lateral direction of the slit.
Claim 4
Dependent Claim
23 words
A slit exposure projection device according to claim 1, wherein the size of the pupil is defined only by said focusing optical system.
Claim 5
Dependent Claim
20 words
A slit exposure projection device according to claim 1, further comprising an aperture stop mounted in said focusing optical system.
Claim 6
Dependent Claim
26 words
A slit exposure projection device according to claim 4, wherein the size of the pupil is defined by said focusing optical system and said aperture stop.
Claim 7
Dependent Claim
48 words
A slit exposure projection device according to claim 5, wherein said focusing optical system is of a circular shape having peripheries thereof cut off in the lateral direction of the slit, and said aperture stop defines the size of the pupil in the longitudinal direction of the slit.
Claim 8
Dependent Claim
43 words
A slit exposure projection device according to claim 4, wherein the size of the pupil is defined only by said aperture stop, and said aperture stop is of a circular shape having peripheries thereof cut off in the lateral direction of the slit.
Claim 9
Dependent Claim
24 words
A slit exposure projection device according to claim 4, wherein said focusing optical system is symmetric in configuration with respect to said aperture stop.
Claim 10
Dependent Claim
23 words
A slit exposure projection device according to claim 4, wherein said focusing optical system is a zoom lens having a variable magnification function.
Claim 11
Dependent Claim
18 words
A slit exposure projection device according to claim 2, wherein said focusing optical system is manufactured by molding.
Claim 12
Dependent Claim
106 words
A copying machine comprising: a photosensitive medium; means for confining a light flux reaching from a document sheet to the photosensitive medium to a slit shape; a focusing optical system for focusing an image of the document sheet onto said photosensitive medium, said system having a pupil which is large in a longitudinal direction of the slit so that a quantity of the light flux is sufficiently large, and which is smaller in a lateral direction of the slit than in the longitudinal direction of the slit, said focusing optical system focusing the light flux onto said photo-receiving plane; and means for scanning the document sheet.
Claim 13
Dependent Claim
106 words
A copying machine comprising: a photosensitive medium; means for confining a light flux reaching from a document sheet to the photosensitive medium to a slit shape; a focusing optical system for focusing an image of the document sheet onto said photosensitive medium, said system having a pupil which is large in a longitudinal direction of the slit so that a quantity of the light flux is sufficiently large, and which is smaller in a lateral direction of the slit than in the longitudinal direction of the slit, said focusing optical system focusing the light flux onto said photo-receiving plane; and means for scanning the document sheet.
Claim 14
Dependent Claim
29 words
A copying machine according to claim 11, wherein said focusing optical system is of a circular shape having peripheries thereof cut off in the lateral direction of the slit.
Claim 15
Dependent Claim
21 words
A copying machine according to claim 11, wherein the size of the pupil is defined only by said focusing optical system.
Claim 16
Dependent Claim
18 words
A copying machine according to claim 11, further comprising an aperture stop mounted in said focusing optical system.
Claim 17
Dependent Claim
24 words
A copying machine according to claim 14, wherein the size of the pupil is defined by said focusing optical system and said aperture stop.
Claim 18
Dependent Claim
46 words
A copying machine according to claim 15, wherein said focusing optical system is of a circular shape having peripheries thereof cut off in the lateral direction of the slit, and said aperture stop defines the size of the pupil in the longitudinal direction of the slit.
Claim 19
Dependent Claim
41 words
A copying machine according to claim 14, wherein the size of the pupil is defined only by said aperture stop, and said aperture stop is of a circular shape having peripheries thereof cut off in the lateral direction of the slit.
Claim 20
Dependent Claim
22 words
A copying machine according to claim 14, wherein said focusing optical system is symmetric in configuration with respect to said aperture stop.
Claim 21
Dependent Claim
21 words
A copying machine according to claim 14, wherein said focusing optical system is a zoom lens having a variable magnification function.
Claim 22
Dependent Claim
16 words
A copying machine according to claim 2, wherein said focusing optical system is manufactured by molding.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |