Optics: measuring and testing – By inspection with agitation or rotation – Of container contents
Patent
1978-04-27
1981-06-23
Rosenberger, R. A.
Optics: measuring and testing
By inspection with agitation or rotation
Of container contents
250574, 356240, G01N 2124
Patent
active
042747457
ABSTRACT:
Method and apparatus for detecting foreign matters in liquids comprising the steps of turning at a high speed a transparent container filled with a liquid, bringing the container to a standstill quickly permitting suspended foreign matters to swirl with the liquid, illuminating the liquid and foreign matters causing the transmitted light to be received by a light detector consisting of a multiplicity of small light sensitive elements measuring 0.01 mm.sup.2 -1 mm.sup.2 and capable of providing output signals proportional to the projected area of foreign matters, and rejecting defective containers that give output signals exceeding the reference value. The small light sensitive elements are connected to the detection visual field selector circuits so that the detection visual field can be changed by selecting a proper number of the small light sensitive elements to be employed according to the size of object to be detected.
REFERENCES:
patent: 3900266 (1975-08-01), Takahashi et al.
patent: 3966332 (1976-06-01), Knapp et al.
patent: 4028553 (1977-06-01), Farcinade
patent: 4058737 (1977-11-01), Takahashi et al.
patent: 4095904 (1978-06-01), Klein et al.
Tagaya Ryosaku
Takahashi Toshio
Eisai Co. Ltd.
Rosenberger R. A.
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