Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-08-03
1990-08-14
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502014, 2502017, G03B 300
Patent
active
049491156
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: 2198014 (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
patent: 3836919 (1974-09-01), Matsuomoto et al.
patent: 3959660 (1976-05-01), Tolliver
patent: 4067030 (1978-01-01), Kuramoto et al.
patent: 4123650 (1978-10-01), Hosoe
patent: 4150888 (1979-04-01), Filipovich
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.
Arai Akihiro
Sugawara Saburo
Tejima Yasuyuki
Toji Shigeo
Yuda Hideaki
Asahi Kogaku Kogyo K.K.
Perkey W. B.
LandOfFree
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.
Profile ID: LFUS-PAI-O-465778