US4733280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Original illuminating device of a copying machine
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1986-10-22
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Granted: 1988-03-22
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Expires: 2006-10-22
Abstract
Abstract A novel original illuminator of electrophotographic copying machine capable of leading the majority of light from the illuminant onto the original surface placed on the contact glass by applying the condenser mirror to allow the light not oriented to the original to reflect itself by a mirror opposite from the condenser mirror before eventually leading light to the illuminant over again.
Inventors
- 👤 Yoichiro Irie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:12
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/542
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A device for illuminating an original document on an electrophotographic copying machine and to prevent a tip shadow on a copy obtained from the machine, said device comprising a contact glass for supporting an original document, an illuminant, a condenser mirror, and a second mirror which is opposite from and faces toward said condenser mirror, said condenser mirror being provided with a shape capable of guiding a majority of light from said illuminant onto an original document which is placed on said contact glass, said second mirror facing said condenser mirror being located in a path of light from the illuminant and condenser mirror but being displaced from direct paths of light which extend from the illuminant and condenser mirror to the original document, said condenser mirror having a shape and orientation capable of reflecting light back to said illuminant.
Claim 2
Independent Claim
140 words
A device for illuminating an original document on an electrophotographic copying machine and to prevent a tip shadow on a copy obtained from the machine, said device comprising a contact glass for supporting an original document, an illuminant, a condenser mirror, and a second mirror which is opposite from and faces toward said condenser mirror, said condenser mirror being provided with a shape capable of guiding a majority of light from said illuminant onto an original document which is placed on said contact glass, said second mirror facing said condenser mirror being located in a path of light from the illuminant and condenser mirror but being displaced from direct paths of light which extend from the illuminant and condenser mirror to the original document, said condenser mirror having a shape and orientation capable of reflecting light back to said illuminant.
Claim 3
Dependent Claim
33 words
The original illuminating device of an electrophotographic copying machine in accordance with claim 1, in which said illuminant has a configuration that causes incident light from the second mirror to be irregularly reflected.
Claim 4
Dependent Claim
29 words
The original illuminating device of an electrophotographic copying machine in accordance with claim 1, in which said second mirror facing said condenser mirror is provided with a plane surface.
Claim 5
Dependent Claim
29 words
The original illuminating device of an electrophotographic copying machine in accordance with claim 1, in which said second mirror facing said condenser mirror is provided with a concave surface.
Claim 6
Dependent Claim
50 words
The original illuminating device of an electrophotographic copying machine in accordance with claim 1, in which said condenser mirror and the second mirror which is opposite from it are integrally formed, and slit means positioned between these mirrors for constraining a passable range of light reflected from the original document.
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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |