Method and arrangement of generating a non-diffractive beam at a

Details Method and arrangement of generating a non-diffractive beam at a Method and arrangement of generating a non-diffractive beam at a

1992-07-31

1994-08-09

Ben, Loha

Registers

Coded record sensors

Particular sensor structure

359 15, 359196, 359558, 359566, 359641, G06K 710, G02B 532, G02B 2608, G02B 2730

Patent

active

053368754

ABSTRACT:
In order to generate a Bessel beam at a location remote from an optical arrangement, the optical arrangement includes, a first beam converging element which is illuminated by a collimated beam, a second beam converging element which is illuminated by a beam which has passed through the first beam converging element. The first and second beam converging elements ere arranged in a manner to radiate a ring beam which is parallel with an optical axis. A third beam converging element is further provided which is illuminated by the ring beam. The third beam converging element is arranged to generate a non-diffractive beam at a location which is remote therefrom. Further, an improvement of a bar code reader is disclosed, which includes a laser source for producing a laser beam. A laser beam deflecting member is provided to deflect the laser beam so as to form a scan pattern comprised of two scan lines. The two scan lines are oriented at a predetermined angle with respect to one another. A combination of photo sensor and electric circuitry is provided to detect the beginning of the scan pattern and to discriminate between the two scan lines.

REFERENCES:
patent: 4887885 (1989-12-01), Durnin et al.
patent: 4999482 (1991-03-01), Yang
patent: 5111312 (1992-05-01), Stewart
patent: 5245619 (1993-09-01), Kronberg
J. Durnin, "Exact solutions for nondiffracting beams. I. The scalar theory", J. Opt. Soc. Am. A, vol. 4, No. 4, Apr. 1987, pp. 651-654.
J. Durnin and J. J. Miceli, Jr., "Diffraction-Free Beams", Physical Review Letters, vol. 58, No. 15, Apr. 13, 1987, pp. 1499-1501.
Jari Turunen et al, "Holographic generation of diffraction-free beams", Applied Optics, vol. 27, No. 19, Oct. 1, 1988, pp. 3959-3961.
M. V. Perez et al, "Diffraction patterns and zone plates produced by thin linear axicons", Optica Acta, vol. 33, No. 9, 1986, pp. 1161-1176.

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