Automatic focusing projector

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

250201, G03B 300, G01J 120

Patent

active

049050346

ABSTRACT:
An automatic focusing projector has a reflector which includes a semispherical mirror and a semielliptical mirror in combination, and a contrast chart having a contrast pattern associated with the reflector. The first focal point of the semielliptical mirror is identical to the center of the semispherical mirror. The contrast pattern is located between the first and second focal points of the semielliptical mirror. A light source is provided in the vicinity of the first focal point of the semielliptical mirror. The light source can be a white light source, and a colored filter can be positioned forwardly of a projecting lens which forms part of the projector in order to pass light having a wavelength region of low luminosity in which a human eye is virtually insensitive.

REFERENCES:
patent: 2154842 (1939-04-01), Glenn
patent: 2198018 (1940-04-01), Ott
patent: 3088023 (1963-04-01), Ayroldi
patent: 3682071 (1972-08-01), Hosoe et al.
patent: 3784836 (1974-01-01), Tolliver
patent: 3820129 (1974-06-01), Hosoe et al.
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 3959660 (1976-05-01), Tolliver
patent: 4067030 (1978-01-01), Kuramoto et al.
patent: 4123650 (1978-10-01), Hosoe et al.
patent: 4150888 (1979-04-01), Filipovitch
patent: 4255029 (1981-03-01), Freudenschuss
patent: 4274735 (1981-06-01), Tamura et al.
patent: 4394077 (1983-07-01), Yoshino et al.
patent: 4447865 (1984-05-01), Van Horn et al.
patent: 4494868 (1985-01-01), Lambeth
patent: 4690538 (1987-09-01), Matsui et al.
patent: 4710638 (1987-12-01), Wood
patent: 4771308 (1988-09-01), Tejima et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Automatic focusing projector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic focusing projector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing projector will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-176726

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.