Method of and an apparatus for picking up an image of the surfac

Details Method of and an apparatus for picking up an image of the surfac Method of and an apparatus for picking up an image of the surfac

1992-09-08

1993-09-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

209582, 356407, 356419, G01J 350

Patent

active

052471691

ABSTRACT:
An object to be inspected is, for example, a medical capsule having differently colored surface areas. A beam splitter divides light reflected by the surface of the object into two parts. Each of the divided parts of the light is passed through an optical filter whose transmission wavelength range is set according to the colors of the object, to adjust the quantity of transmitted light from a high-brightness part of the object surface and the quantity of transmitted light from a low-brightness part of the object surface to a reference level. Image pick-up elements pick up images of the object surface according to the divided parts of the light and provide image signals. One of the image signals is selected and provided outside. Unlike a prior art that adjusts levels of signals by amplifying the signals according to brightness of an inspected object, the method and apparatus of the invention do not involve amplification. The invention, therefore, never amplifies noise components to cause errors in inspection, thereby improving inspection accuracy.

REFERENCES:
patent: 3609047 (1971-09-01), Marlow
patent: 3980181 (1976-09-01), Hoover et al.
patent: 4082188 (1978-04-01), Grimmell et al.
patent: 4143770 (1979-03-01), Grimmell et al.
patent: 4822998 (1989-04-01), Yokota et al.

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