Optics: image projectors – Slide transfer mechanism
Patent
1996-09-18
1997-07-01
Dowling, William
Optics: image projectors
Slide transfer mechanism
353 65, 353DIG4, G03B 2114
Patent
active
056429266
ABSTRACT:
A projector of a reflection type has a transparent stage plate on which a transparent original sheet is set. A lamp illuminates the original sheet through the stage plate. A Fresnel mirror is laid on an upside of the original sheet, and reflects light from the original sheet in a convergent manner. The light from the Fresnel mirror is reflected away from the stage plate. The light is again reflected, and incident upon a projecting lens, which projects an image of the original sheet to a screen. A housing contains the Fresnel mirror in movable fashion. An inserting slot is formed in the housing, into which the original sheet is inserted during supply of the original sheet. Photo sensors operate to detect a front edge of the original sheet inserted through the inserting slot. It is also detected that the original sheet is set on the stage plate. An ejector switch is operated for ejection of the original sheet. A solenoid shifts the Fresnel mirror up away from a set position in response to a signal from the photo sensors or the ejector switch. The Fresnel mirror is shifted down to the set position in response to a sheet setting signal, to lie on the original sheet. A sheet feeder roller moves the original sheet from the inserting slot to the stage plate during the supply, and moves the original sheet out of the housing during the ejection of the original sheet.
REFERENCES:
patent: 5059020 (1991-10-01), Genieis
patent: 5172145 (1992-12-01), Stephenson
patent: 5440362 (1995-08-01), Jones
patent: 5444506 (1995-08-01), Nakazawa et al.
patent: 5446511 (1995-08-01), Kitahara et al.
Kimura Soichiro
Nomura Masaaki
Dowling William
Fuji Photo Film Co. , Ltd.
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