Optics: image projectors – Plural projection paths with single light source
Patent
1977-08-03
1979-04-17
Henry, Jon W.
Optics: image projectors
Plural projection paths with single light source
353101, G02B 1514
Patent
active
041497759
ABSTRACT:
A remotely controlled projection zoom lens apparatus utilizes a zoom lens assembly having a spur gear fitted to the barrel element of a zoom lens rotationally driving a zoom lens element. Another spur gear is co-axially aligned with an iris element operable in line with the zoom lens assembly. Both spur gears are in turn operated by a gear train and powered by a common motor. A slip clutch may be interposed between the motor output shaft and the gear train or between the gear train and either or both spur gears, permitting the iris barrel or zoom barrel to engage stop position without damage when one or the other is driven to a stop position by the motor, or to adjust angular position relative to one another. The gear train is rotationally coupled to a potentiometer, which in turn signals the position thereof to a remotely located indicating device. The motor is controlled from the remote location as well. Images may be projected through the zoom lens from conventional slide projectors so as to have the displayed projection maintained at a constant light density regardless of the size of the displayed image.
REFERENCES:
patent: 2924146 (1960-02-01), Back
patent: 3541941 (1970-11-01), Barr
patent: 3610733 (1971-10-01), Back
patent: 3896466 (1975-07-01), Korpert
Farkas Robert D.
Henry Jon W.
LandOfFree
Zoom lens apparatus with adjustable aperture does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zoom lens apparatus with adjustable aperture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens apparatus with adjustable aperture will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1259262