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Disclosed is a prismatic optical cavity for use in point of sale bar code scanners. Its function is to create the desired laser beam scan pattern.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
97% of the total text.
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Solid Optical Cavity for Point of Sale Bar Code Scanners
Disclosed is a prismatic optical cavity for use in point of sale bar code
scanners. Its function is to create the desired laser beam scan pattern.
The optical cavity in conventional bar code scanners usually consists of
multiple mirrors that are bonded in place and are enclosed within a sealed
chamber. Sealing of this chamber protects the mirror surfaces from
contaminants and prevents exposure to the laser beam by the accidental
insertion of a reflective object into the optical cavity. Considerable design effort
and product cost is consumed in properly sealing the scanner.
The disclosed design replaces these multiple mirrors with a single, solid,
transparent plastic part with flat exterior surfaces. Fig. 1 shows an isometric
sketch of the solid cavity where the laser beam enters at point 'A' and is reflected
by the appropriate surfaces to form the desired pattern on surface 10. As long as
the incident angle of the beam exceeds the critical angle, no mirror coating is
required on that surface. This includes the top surface where the beam may be
deflected when it comes from the laser source and yet leave the cavity when it
comes from a mirror, allowing a single surface to be both a mirror and a window.
Where the angle of incidence is too small, a mirror coating may be applied to that
The solid cavity replaces multiple mirrors, solves the sealing problem and
provides a very efficient optical system in...