Image projecting system

Details Image projecting system Image projecting system

1989-01-04

1990-12-18

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Film strip

353 74, 353 97, G03B 2110

Patent

active

049782150

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 mounted in the body of the system removably. 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 said 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: 4110020 (1978-08-01), Johnson et al.
patent: 4755046 (1988-07-01), Hirose et al.

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