Pattern reading apparatus
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTuyoshi Ishikawa
Life of this patent
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Abstract
A pattern reading apparatus reads a pattern from a reflective object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using only a diffused component of light which has been reflected from the object. The imaging element is positioned where the image of the pattern is imaged for reading the pattern.
Claims15
A pattern reading apparatus for causing an illumination light beam, emitted from a minute-area light source, to be incident on an object surface having a pattern formed thereon as an object to be read, converging the light beam, having the information of the pattern, by an objective lens, causing the converging light beam to be incident on an imaging lens, forming the image of the pattern by the imaging lens and reading the image, wherein
- the objective lens is positioned such that the light beam originating from a point of the object surface and emitted from the objective lens is a non-parallel light beam and wherein the imaging lens and an imaging surface are movable along an optical axis direction of the imaging lens to change magnification.
A pattern reading apparatus, comprising:
- a minute-area light source;
- an objective lens that causes an illumination light beam from said light source to be incident on an object surface having a pattern formed thereon as an object to be read and converging a light beam reflected at the object surface;
- a spatial filter that captures a scattered reflected component which is contained in the reflected light beam that passed through said objective lens;
- and
- an imaging element positioned at the imaging position of the pattern image for reading the pattern,
- wherein said imaging lens and said imaging element are movable along the optical axis direction of said imaging lens to change magnification.
Dependencies are inferred from the claim text.