Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-08-21
1990-06-05
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022726, 358484, G02B 2610, H04N 110
Patent
active
049316370
ABSTRACT:
A laser beam scanner comprising a laser source, apparatus for producing a scanning beam and a reference beam which are generally parallel, apparatus for directing the scanning beam onto a surface to be scanned, and apparatus for determining the position of the scanning beam in real time in two dimensions by sensing the position of the reference beam, and wherein the apparatus for sensing the position of the reference beam comprises a grating disposed along a scan axis and defining a multiplicity of first grating lines along the scan axis, which permit the definition of the position of the reference beam in a first dimension, a second grating line disposed across the multiplicity of first grating lines and first and second sensors disposed at respective sides of the second grating line, for sensing the relative amount of light impinging above and below the second grating line, for permitting the definition of the reference beam in a second dimension, whereby the position of the reference beam may be determined both along the scan axis and perpendicular thereto at every location along the scan axis.
REFERENCES:
patent: 4568984 (1986-02-01), Juergensen et al.
patent: 4602154 (1986-07-01), Taniguchi
patent: 4617470 (1986-10-01), Horikawa
Laser Recording Performance with Spatial Error Compensation, S. Bousky and L. Teeple, SPIE, vol. 53, 1973, (pp. 133-139).
Beam Deflection at High Accuracy and Precision, D. P. Jablonowski and J. Raamot, SPIE, vol. 84, 1976.
Ultrahigh Resolution Data Terminal, M. R. Smith, R. H. Burns, and R. C. Tsai, SPIE, vol. 200, 1979, (pp. 171-178).
Bestenheimer et al., Journal of Appl. Photo. Eng., vol. 2, 1976, (pp. 86-92).
Beiber Avigdor
Berman Dov
Gilad Shalev
Nagler Michael
Succari Shmuel
Scitex Corporation Ltd.
Westin Edward P.
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