Optics: image projectors – Light shield – mask – hood – or diaphragm
Patent
1987-12-17
1989-07-11
Haroian, Harry N.
Optics: image projectors
Light shield, mask, hood, or diaphragm
353 26R, G03B 2114
Patent
active
048465690
ABSTRACT:
An image projecting system for irradiating a microfilm with light emitted from a light source and projecting an image recorded on the microfilm onto an image receptor such as a screen or a photosensitive drum, the image projecting system having a masking unit which is removably mounted in the body of the system. The masking unit contains a first masking portion which is for changing the range of the image advancing toward the image receptor through an optical path, in a first direction of the microfilm, and a second masking portion which is for changing the range of the image in a direction approximately perpendicular to the first direction. These masking portions are disposed in close proximity to the microfilm. Thus, a desired range of the image recorded on the microfilm can be projected on the image receptor and the outer peripheral edge of the projected image is made sharp and clear by the above masking portions. Normal operation and other operations for maintenance can be done easily by removing the masking unit from the system body.
REFERENCES:
patent: 3531193 (1970-09-01), Diehl
patent: 3627411 (1971-12-01), Nagel
patent: 3881815 (1975-05-01), McGourty
patent: 4325630 (1982-04-01), Kimura et al.
patent: 4609268 (1986-09-01), Crawford
Katoh Osami
Kusano Hideaki
Haroian Harry N.
Minolta Camera Kabushiki Kaisha
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