Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1991-07-31
1993-07-20
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502018, G03B 1336, G02B 728, G01J 120
Patent
active
052298078
ABSTRACT:
A focus detecting device which comprises an objective lens for forming an image of an object, a condenser lens, located behind a predetermined focal plane of the objective lens, for converging the light passed through the objective lens, a pair of image re-forming lenses, located behind the condenser lens, for re-forming a pair of secondary images of the image formed by the objective lens on an off-axial region of the objective lens located at a position far from the optical axis thereof, a light direction changing device, located nearby the condenser lens, for changing the direction along which light bundles forming the secondary images passes towards the optical axis, and a light receiving device for receiving the pair of the secondary images formed by the secondary image forming device to produce a light intensity distribution signal representing the light intensity distribution of the secondary images, a focus condition calculating device for calculating a focus condition of the objective lens by means of detecting the positions of the pair of the secondary images in accordance with the light intensity distribution signal.
REFERENCES:
patent: 4857718 (1989-08-01), Karasaki et al.
patent: 4949116 (1990-08-01), Karasaki et al.
patent: 4978988 (1990-12-01), Karasaki
patent: 4992818 (1991-02-01), Karasaki et al.
patent: 5005041 (1991-04-01), Suda et al.
patent: 5017005 (1991-05-01), Shindo
Karasaki Toshihiko
Sugitani Kazumi
Minolta Camera Kabushiki Kaisha
Perkey W. B.
LandOfFree
Focus detecting device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detecting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1764252