Title:
CORRECTNESS RECOGNIZING METHOD, AND SEAL AND RECOGNITION DEVICE USED FOR THE SAME
Document Type and Number:
Japanese Patent JPH05224579
Kind Code:
A
Abstract:
PURPOSE: To provide the correctness recognizing method which exactly decides whether or not an article correct and the seal and recognition device which are used for the method.
CONSTITUTION: An image of a Fourier-transformed hologram is formed on the sheet 20 on the seal. This sheet 20 is irradiated vertically with the laser light from the laser light emission device 104 of the recognition device 100. The laser light which is reflected by the surface of the sheet 20 is received by a screen 110 and the image formed on the sheet 20 is reproduced on the screen surface. At this time, it is confirmed whether or not the laser light strikes on the sheet 20 by peeping through the opening part 108 of a case 102.
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Inventors:
HOU HAYAO
ISAKA ISAO
ISAKA ISAO
Application Number:
JP32117491A
Publication Date:
September 03, 1993
Filing Date:
November 08, 1991
Export Citation:
Assignee:
SHOEI PRINTING
A M C KK
A M C KK
International Classes:
G03H1/16; G03H1/18; G03H1/22; G09F3/02; G06K13/16; (IPC1-7): G03H1/16; G03H1/18; G09F3/02
Domestic Patent References:
| JPH0196682A | 1989-04-14 | |||
| JPH01252988A | 1989-10-09 |
Attorney, Agent or Firm:
Okada