Appeal No. 1999-0236
Application 08/624,173
above a stage 1 on which an object to be read is placed
(abstract). Two laser beams irradiators 8, 8' are disposed on
the side of the camera to face obliquely downwards such that
one laser beam provides a spot of light elongated lengthwise
(vertically) and the other laser beam provides a spot of light
elongated widthwise (horizontally), and that these two light
spots intersect with each other in a crisscross at the
position coincident with the focus of the camera (abstract;
col. 7, lines 32-45). A plurality of illumination blocks 10,
each equipped with infrared LEDs 9, are disposed around the
camera to illuminate the object holding stage, the angle and
brightness of the illumination blocks being adjustable
(abstract; col. 7, lines 46-60).
Hanson discloses a method and apparatus for reading
optical information over a range of distances. The apparatus
has a plurality of LED pairs, each of which emits light at a
discrete wavelength to illuminate the object, which are
sequentially turned on and off (col. 3, line 65 to col. 4,
line 28). The reflected image produced by each wavelength of
light is incident on the receiving plane 24 of a
photosensitive array 22, which produces a signal corresponding
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