Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-03-25
1988-05-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 4, G01V 904
Patent
active
047483334
ABSTRACT:
A surface displacement sensor is so designed that a stop or aperture for controlling an angle of opening is disposed at the position of a pupil of a detection optical system in which a slit image is focused on the surface to be detected and the light rays reflected from the surface to be detected are collected to re-focus the slit image on the light receiving surface of the sensor. When the height position of the surface to be detected is detected by such stop for controlling the angle of opening, the deviation of the distribution of intensity of light which tends to occur in the widthwise direction of the slit through which passes the light beam which in turn focuses a slit image, can be positively decreased by limiting the angle of opening N.A. in the widthwise direction of the slit for passing the light beam to focus a slit image to be narrow and consequently the degree of detection accuracy can be improved. The stop for controlling the angle of opening is so designed and constructed that in the case of detecting operation of the sensor, the angle of opening N.A. in the widthwise direction of the slit image is limited so that the slit image having a sufficiently narrow angle of opening can be obtained. Furthermore, in the case of the focal point adjustment of the optical system, the stop is so switched that a slit image having a sufficiently wide angle of opening N.A. in the widthwise direction thereof can be focused on a receiving slit. The focal point adjustment is further facilitated in the surface displacement sensor.
REFERENCES:
patent: 4373816 (1983-02-01), Laib
patent: 4589773 (1986-05-01), Ido et al.
patent: 4647209 (1987-03-01), Neukomm et al.
Ishizaka Shoji
Mizutani Hideo
Suto Takeshi
Nelms David C.
Nippon Kogaku K. K.
Ruoff Jessica L.
LandOfFree
Surface displacement sensor with opening angle control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface displacement sensor with opening angle control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface displacement sensor with opening angle control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1876026