| |
 |
|
Class Information
Number: 250/204
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controls its own optical systems > Adjusting optical system to balance brightness in plural paths
Description: Subject matter having two optical paths from a source or two sources of illumination to one or more photocells and having means for controlling one or more of the optical paths so that the ratio of light flux which traverses the different optical paths stays constant.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7045974 |
LED optical energy detection and feedback system |
May. 16, 2006 |
| 6974940 |
Anti-glare rearview mirror assembly and reflectance control method of same |
Dec. 13, 2005 |
| 6875971 |
Wafer edge exposure apparatus, and wafer edge exposure method |
Apr. 5, 2005 |
| 6870147 |
Light stability testing device |
Mar. 22, 2005 |
| 6831262 |
Method of determining characteristic correction data for correcting output signal from image sensor |
Dec. 14, 2004 |
| 6665097 |
Image reading apparatus |
Dec. 16, 2003 |
| 6525303 |
Control systems and methods for synchronizing diffuse illumination with a camera |
Feb. 25, 2003 |
| 6396873 |
Optical device |
May. 28, 2002 |
| 6350977 |
Pattern distortion detecting method and apparatus and recording medium for pattern distortion detection |
Feb. 26, 2002 |
| 6008484 |
Observer tracking directional display and observer tracking illumination system |
Dec. 28, 1999 |
| 5767989 |
Image inputting apparatus |
Jun. 16, 1998 |
| 5710662 |
Automatic focus detection device for microscopes |
Jan. 20, 1998 |
| 5672862 |
Optical apparatus having image shake preventing function |
Sep. 30, 1997 |
| 5652424 |
Focus state detection device and method |
Jul. 29, 1997 |
| 5559321 |
Focus detecting device having light distribution detection |
Sep. 24, 1996 |
| 5552594 |
Focus detecting system using a beam splitter to form an image at nominal best focus, slightly in front of best focus and slightly behind best focus |
Sep. 3, 1996 |
| 5534688 |
Focus detecting device having light distribution detection |
Jul. 9, 1996 |
| 5525792 |
Camera having superimposed information display device |
Jun. 11, 1996 |
| 5506399 |
Focus detection device |
Apr. 9, 1996 |
| 5420438 |
Focus detecting apparatus including movement of detecting zones |
May. 30, 1995 |
| 5276550 |
Optical microscope with variable magnification |
Jan. 4, 1994 |
| 5233431 |
Image pickup device |
Aug. 3, 1993 |
| 4989827 |
Distance distribution measuring method and apparatus varying spacing between an image pickup and the optical axis |
Feb. 5, 1991 |
| 4988856 |
Automatic focusing apparatus of a camera for photographing moving objects |
Jan. 29, 1991 |
| 4977311 |
Camera with focus detecting device for removing vignetting effects |
Dec. 11, 1990 |
| 4972243 |
Photoelectric conversion apparatus with shielded cell |
Nov. 20, 1990 |
| 4965443 |
Focus detection apparatus using neural network means |
Oct. 23, 1990 |
| 4952966 |
Focus detecting device for use with cameras |
Aug. 28, 1990 |
| 4950879 |
Focus detecting device for use with cameras |
Aug. 21, 1990 |
| 4942418 |
Focus condition detecting device |
Jul. 17, 1990 |
| 4939357 |
Optical system for a focal point detecting device |
Jul. 3, 1990 |
| 4914282 |
Focus detection system employing multiple area light distribution sensors |
Apr. 3, 1990 |
| 4912497 |
Device for detecting the focal value for the focusing of optical apparatus |
Mar. 27, 1990 |
| 4904855 |
Method for detecting relative position of an image pair including contrast detection |
Feb. 27, 1990 |
| 4903065 |
Focus condition detecting device |
Feb. 20, 1990 |
| 4900911 |
Focus detecting system utilizing correction data on aberrations of the photographic lens |
Feb. 13, 1990 |
| 4899041 |
Light sensor for detecting an object in a certain distance |
Feb. 6, 1990 |
| 4888490 |
Optical proximity apparatus and method using light sources being modulated at different frequencies |
Dec. 19, 1989 |
| 4883951 |
Method and system for detecting whether an optical system is in focus using an improved interpolation technique |
Nov. 28, 1989 |
| 4870263 |
Device for determining the contrast of a display screen as a function of the observation direction |
Sep. 26, 1989 |
| 4864117 |
Device with a discriminating priority system |
Sep. 5, 1989 |
| 4862204 |
Focus detection device and method |
Aug. 29, 1989 |
| 4860045 |
Automatic focusing device |
Aug. 22, 1989 |
| 4859842 |
Multi-directional focus state detection apparatus |
Aug. 22, 1989 |
| 4857718 |
Focus detecting device |
Aug. 15, 1989 |
| 4857717 |
Automatic focusing device using a light sensor of center-split type |
Aug. 15, 1989 |
| 4849782 |
Focus detecting device |
Jul. 18, 1989 |
| 4835562 |
Focus condition detecting device |
May. 30, 1989 |
| 4833313 |
Focus detecting apparatus having increased SNR by selectively varying or holding constant the number of signals from sensor arrays |
May. 23, 1989 |
| 4833315 |
Automatic focus detecting device in which two object images formed through different light paths are converted to photoelectric signals |
May. 23, 1989 |
|
|
|
