Dual-magnification rear projection lectern

Details Dual-magnification rear projection lectern Dual-magnification rear projection lectern

1984-06-06

1985-12-31

Haroian, Harry N.

Optics: image projectors

Lens support

Lens position adjustable

353 78, G03B 300

Patent

active

045617406

ABSTRACT:
A dual-magnification rear screen projector having a fixed projection lens and two auxiliary lenses which may be positioned before and after the projection lens in the light path to change the magnification of the system. The system is parfocal in that none of the lenses need be repositioned axially along the light path to focus the system at either magnification.

REFERENCES:
patent: 2181133 (1939-11-01), Katz
patent: 2238267 (1941-04-01), Katz
patent: 3369450 (1968-02-01), Peters
patent: 3588226 (1971-06-01), Ikezu
patent: 3675998 (1972-07-01), Wilton
patent: 4053208 (1977-10-01), Kato et al.
patent: 4067648 (1978-01-01), Spreitzer
patent: 4119372 (1978-10-01), Morgan
patent: 4146315 (1979-03-01), Pribich
patent: 4200367 (1980-04-01), Douglas
patent: 4343538 (1982-10-01), Astero
patent: 4436393 (1984-03-01), Vanderwerf

Affiliated with

Also associated with

Rating

Dual-magnification rear projection lectern does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual-magnification rear projection lectern, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual-magnification rear projection lectern will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1021667