Optical information code reading apparatus using marker beam
First Claim
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1. An optical information reading apparatus comprising:
- a pickup unit having a predetermined reading field and configured to optically pickup an information code from a target when the information code is located in the reading field; and
a marker beam irradiating unit comprising;
a light beam source configured to emit a light beam;
a diffusing lens coaxially arranged at a light beam emitting side of the light beam source and configured to diffuse the light beam emitted from the light beam source;
a collective lens arranged optically coaxial with the diffusing lens and configured to collect the diffused light beam;
a beam pattern forming member arranged between the collective lens and the target and configured to form a marker beam having a predetermined beam pattern based on the diffused light beam collected by the collective lens, the predetermined beam pattern having at least one linear beamlet indicating the reading field of the pickup unit; and
an imaging lens arranged be the beam pattern forming member and the target and configured to form a marker beam image on the target based on the marker beam with the predetermined beam pattern;
wherein the light beam emitted from the light beam source has a substantially prolate ellipsoid profile in a first direction orthogonal to an optical axis of the light beam source, and the diffusing lens has an output surface facing the collective lens, the output surface being concavely curved in a second direction orthogonal to the optical axis and the first direction, the output surface allowing the light beam emitted from the light beam source incident into the diffusing lens to be diffused in the second direction to form a diffused light beam so that the diffused light beam diffused by the diffusing lens has a substantially circular profile in a lateral cross section thereof.
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Abstract
In an optical information reading apparatus, a marker beam irradiating unit has a light beam source for emitting a light beam, a diffusing lens for diffusing the light beam emitted from the light beam source, and a collective lens for collecting the light beam diffused by the diffusing means. The marker beam irradiating unit has a pattern forming unit for forming a marker beam based on the light beam collected by the collecting means to irradiate the marker beam. The marker beam has a predetermined beam pattern indicating the reading position of the pickup unit.
10 Citations
11 Claims
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1. An optical information reading apparatus comprising:
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a pickup unit having a predetermined reading field and configured to optically pickup an information code from a target when the information code is located in the reading field; and a marker beam irradiating unit comprising; a light beam source configured to emit a light beam; a diffusing lens coaxially arranged at a light beam emitting side of the light beam source and configured to diffuse the light beam emitted from the light beam source; a collective lens arranged optically coaxial with the diffusing lens and configured to collect the diffused light beam; a beam pattern forming member arranged between the collective lens and the target and configured to form a marker beam having a predetermined beam pattern based on the diffused light beam collected by the collective lens, the predetermined beam pattern having at least one linear beamlet indicating the reading field of the pickup unit; and an imaging lens arranged be the beam pattern forming member and the target and configured to form a marker beam image on the target based on the marker beam with the predetermined beam pattern; wherein the light beam emitted from the light beam source has a substantially prolate ellipsoid profile in a first direction orthogonal to an optical axis of the light beam source, and the diffusing lens has an output surface facing the collective lens, the output surface being concavely curved in a second direction orthogonal to the optical axis and the first direction, the output surface allowing the light beam emitted from the light beam source incident into the diffusing lens to be diffused in the second direction to form a diffused light beam so that the diffused light beam diffused by the diffusing lens has a substantially circular profile in a lateral cross section thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification