Optical identification multiple diffraction grating mark member

Details Optical identification multiple diffraction grating mark member Optical identification multiple diffraction grating mark member

1992-07-08

1994-03-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235487, G06K 710

Patent

active

052910270

ABSTRACT:
An identification mark comprises a set of a plurality of mark elements. One mark element is divided into a large number of first and second fine square regions alternately arranged. One or two basic gratings selected from a plurality of types of basic gratings is/are drawn in both fine square regions, so that patterns are formed. Since the basic gratings are different in direction of the grating or spatial frequency, the types of the basic gratings are different from each other. One selected type of basic gratings is drawn in all first fine square regions. Similarly, the one or another type of basic gratings is drawn in all second fine square regions. At least one first fine region and at least one second fine region exist in the diameter of the light beam when light is radiated on the mark element for optical read. Thereby, types of patterns, which one mark element can obtain, are increased.

REFERENCES:
patent: 3749922 (1973-07-01), Meeussen
patent: 4011435 (1977-03-01), Phelps et al.
patent: 4023010 (1977-05-01), Horst et al.
patent: 4870260 (1989-09-01), Niepolomski et al.
patent: 5058992 (1991-10-01), Takahashi
patent: 5101184 (1992-03-01), Antes

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