Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-04-03
1993-07-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250234, 359368, H01J 314
Patent
active
052256715
ABSTRACT:
A laser beam emitted from a light source is transformed into a parallel beam by a collimator lens, and then reflected by a polarization beam splitter. Thereafter, the beam passes through a .lambda./4 plate, and is converged onto a sample plane by an objective lens. The light beam from the sample plane passes through the objective lens, the .lambda./4 plate and the polarization beam splitter, and entering into an image-forming lens. The image-forming lens comprises a convex lens and a concave lens. The focal length of the image-forming lens is long. Thus, the diameter of the airy disk of the beam converged by the image-forming lens is larger than that of a beam converged at a common focal point by a single convex lens. The converged beam passes through an aperture and enters into a photoelectric detector element which outputs a signal indicative of the intensity of the received beam. An image-forming unit forms an image of the sample plane on the basis of signals from the photoelectric detector element and a scanning unit, and the image is displayed on the display device.
REFERENCES:
patent: 5086222 (1992-02-01), Shibuya
patent: 5101295 (1992-03-01), Lichtman et al.
Nelms David C.
Olympus Optical Co,. Ltd.
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