Title:
光学式読取装置
Document Type and Number:
Japanese Patent JP3571211
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To correct distribution of quantity of light without installing independently a correction circuit. SOLUTION: An image picking-up plane 50 of an optically transparent body 2 for picking up an object 13 is made circular. An irradiation means 33 is circularly arranged surrounding the image picking-up plane 50, which is obliquely irradiated from the outer peripheral side. Thereby characteristics of the quantity of light in the peripheral part of a lens 41 are decreased so as to cancel increase of the quantity of light in the peripheral part which is caused by the irradiating means 33 for oblique irradiation from the outer peripheral side.
Inventors:
Higashi Katsuhisa
Shigeki Oguchi
Shigeki Oguchi
Application Number:
JP11390998A
Publication Date:
September 29, 2004
Filing Date:
April 23, 1998
Export Citation:
Assignee:
Sankyo Seiki Co., Ltd.
International Classes:
G01N21/84; G02B1/10; G02B1/11; G02B1/111; G02B13/24; G02B27/02; G01J1/04; G03B15/03; G06K7/10; G06K9/20; G07D5/02; H04N1/04; (IPC1-7): G01J1/04; G01N21/84; G02B13/24; G02B27/02; G07D5/02
Domestic Patent References:
| JP8320450A | ||||
| JP58102210A | ||||
| JP61199661U | ||||
| JP60181879A |
Attorney, Agent or Firm:
Kazumi Murase