Title:
DETECTION METHOD OF MINUTE FLAW IN TRANSPARENT OBJECT
Document Type and Number:
Japanese Patent JP2769797
Kind Code:
B2
Abstract:
PURPOSE: To obtain a detection method in which a minute bubble at the inside of a transparent object or a minute inside foreign body which has been stuck to its surface can be detected automatically, at a high speed and with good accuracy.
CONSTITUTION: A transparent object such as a glass bottle 1 or the like is irradiated with a converged laser beam 4. The laser beam which has been incident from one face 5 of the transparent object is reflected by the other face 9, and it is radiated again from one face. A region which contains a part from the incident point (a) up to the radiant point (b) of time laser beam 4 is imaged by a camera 7. Reflected images C, D between a reflected image A by the incident point (a) and a reflected image B by the radiant point (b) are detected regarding its image. The existence of a minute flaw is judged on the basis of the detected reflected images C, D.
Inventors:
Kuribayashi Seiki
Application Number:
JP8201995A
Publication Date:
June 25, 1998
Filing Date:
March 15, 1995
Export Citation:
Assignee:
Toyo Glass Co., Ltd.
International Classes:
G01N21/88; G01N21/90; G01N21/94; G06T1/00; G06T7/00; (IPC1-7): G01N21/90
Domestic Patent References:
| JP424541A | ||||
| JP41507A | ||||
| JP474748A | ||||
| JP674915A |
Attorney, Agent or Firm:
Harada Shinichi