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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/164009
Kind Code:
The objective of the present invention is to provide an illuminating device which uses one illuminating light source to supply an amount of light onto an object being detected, to create a detection image which is bright overall and which has no parts in shadow. A light source required to illuminate the object being detected from above and below is shared, and the object being detected is illuminated by the light from the illuminating light source being received by a plurality of reflectors and divided to form upward illuminating light and downward illuminating light. Further, optical paths of at least some light beams from the illuminating light source are reflected by a refracting mirror and are then caused to be incident on the reflectors. In this way, the number of illuminating light sources can be reduced without causing a reduction in the amount of light, and a reduction in the size of the overall illuminating device can be achieved. Furthermore, by employing a concave curved mirror reflector consisting of a plurality of concave curved partial surfaces having different curvatures, the object being detected is present in an illuminated zone even if a fall trajectory of the object being detected deviates from an assumed fall trajectory, and therefore a shadow does not occur in a detection image obtained using a camera, and the image itself does not become dark. As a result, a deterioration in detection accuracy can be prevented.

KAWAMURA Yoichi (7-2 Sotokanda 4-chome, Chiyoda-k, Tokyo 21, 〒1010021, JP)
Application Number:
Publication Date:
August 29, 2019
Filing Date:
February 26, 2019
Export Citation:
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SATAKE CORPORATION (7-2 Sotokanda 4-chome, Chiyoda-ku Tokyo, 21, 〒1010021, JP)
International Classes:
G01N21/84; B07C5/342; F21V7/09; G01N21/85; F21Y115/10
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (NAKAMURA & PARTNERS, Shin-Tokyo Bldg. 3-1, Marunouchi 3-chome, Chiyoda-k, Tokyo 55, 〒1008355, JP)
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