Registers – Coded record sensors – Particular sensor structure
Patent
1989-06-09
1990-09-11
Arnold, Bruce Y.
Registers
Coded record sensors
Particular sensor structure
350 371, 350 67, 235467, 235470, G02B 2702, G06K 710
Patent
active
049556932
ABSTRACT:
An optical window is disclosed for association with a scanning face of a laser scanner wherein a laser beam is projected through the window to define a scanning pattern and the optical window is supported such that at least one surface of the window is angularly oriented relative to the scanning face to improve the incidence angles of the laser beam on the window and/or the refractive angles of the laser beam at the window. Preferably, the window comprises a composite block of optical material having sections corresponding to portions of the scanning pattern of the laser scanner and being formed and supported to define the angular orientations of upper and lower surfaces of the sections relative to the scanning face of the scanner in accordance with the corresponding portions of the scanning pattern. Portions of the window through which the laser beam is not transmitted may be used to support the window and preferably are matted to reduce ambient light sensitivity of the laser scanner. Depending upon the geometry of the laser path within the laser scanner and the application, the window may comprise: a wedged block of optical material having an upper surface parallel to the scanning face and a lower surface angularly oriented relative to the upper face; a generally rectangular block of optical material having parallel upper and lower faces which are angularly oriented relative to the scanning face; or, a wedged block of optical material having an upper surface angularly oriented relative to the scanning face at a first angle of orientation and a lower face angularly oriented relative to the scanning face at a second angle of orientation different from the first angle.
REFERENCES:
patent: 4591236 (1986-05-01), Broockman et al.
patent: 4713532 (1987-12-01), Knowles
Arnold Bruce Y.
Phan James
Spectra-Physics Inc.
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