Photocopying – Projection printing and copying cameras – With temperature or foreign particle control
Patent
1990-12-03
1991-11-05
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
With temperature or foreign particle control
355 67, G03B 2752
Patent
active
050634046
ABSTRACT:
A scanning/illumination assembly for a document copier is modified to reduce overheating conditions at the glass platen on which the document is placed during a scan/copy mode. The illumination lamp, which produces both light and an unwanted byproduct of heat, is placed within a glass tube open at both ends. The glass tube is nested within a curved portion of an associated reflector. Heat which would normally build up at the platen surface is instead contained within the space between the lamp envelope and the glass tube, and is transferred out the ends of the glass tube annulus along a convection path. Heat is also absorbed by the glass tube and transferred by convection to the air surrounding the glass tube. An additional component of heat transfer is by conduction from the glass tube to a heat sink established within the scan carriage via the seating reflector. Heat transfer as described is assisted by the movement of the illumination assembly during scan mode.
Convection heat transfer can be enhanced by the use of blower(s). Also, convection heat transfer can be enhanced by the use of a conduit and blower system to establish a predetermined forced air flow through the glass tube annulus.
REFERENCES:
patent: 3712731 (1973-01-01), Shiina
patent: 3936672 (1976-02-01), Tanaka
patent: 4143964 (1979-03-01), Ogura et al.
patent: 4183656 (1980-01-01), Ishihara
patent: 4300831 (1981-11-01), Isago
patent: 4386842 (1983-06-01), Beery
patent: 4411516 (1983-10-01), Adachi et al.
patent: 4422100 (1983-12-01), DuVall et al.
patent: 4632539 (1986-12-01), Temple
patent: 4684237 (1987-08-01), Buchar et al.
patent: 4721980 (1988-01-01), Yazaki
patent: 4827313 (1989-05-01), Corona
patent: 4954862 (1990-09-01), Lee et al.
Wintercorn Richard A.
Xerox Corporation
LandOfFree
Document illumination assembly adapted to reduce platen overheat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Document illumination assembly adapted to reduce platen overheat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Document illumination assembly adapted to reduce platen overheat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-501338