OPTICAL SYSTEM FOR BARCODE SCANNER
First Claim
1. An optical system used in a barcode scanner for reading a barcode of a product, the optical system comprising:
- a light source adapted to emit a dot-shaped light beam onto the barcode of the product in a slanting angle;
a standing cylindrical lens adapted to expand the dot-shaped light beam produced by said light source as a line-shaped light beam onto the barcode of the product in a slanting angle, said expanded light beam showing a light intensity distribution curve that is a deformation curve that is asymmetric between the left side and the right side;
a focusing lens adapted to focus an image reflected by the barcode of the product; and
a linear sensor array adopted to receive the image focused by the focusing lens, wherein the reflective image has different levels between the left side and the right side.
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Accused Products
Abstract
An optical system used in a barcode scanner is disclosed to include a light source for emitting a dot-shaped light beam in a slanting angle, a standing cylindrical lens for expanding the dot-shaped light beam produced by the light source as a line-shaped light beam onto a barcode of a product in a slanting angle, which line-shaped light beam showing a light intensity distribution curve that is asymmetric between the left side and the right side, a linear sensor array, and a focusing lens for focusing a reflective image of the barcode onto the linear sensor array. A reflector means can be provided for overlapping the light path to reduce the size of the barcode scanner. Further, a shaking means may be used to cause reciprocation of the light beam in direction perpendicular to the light path of the light source, thereby eliminating image noises due to existence of black holes.
38 Citations
17 Claims
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1. An optical system used in a barcode scanner for reading a barcode of a product, the optical system comprising:
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a light source adapted to emit a dot-shaped light beam onto the barcode of the product in a slanting angle; a standing cylindrical lens adapted to expand the dot-shaped light beam produced by said light source as a line-shaped light beam onto the barcode of the product in a slanting angle, said expanded light beam showing a light intensity distribution curve that is a deformation curve that is asymmetric between the left side and the right side; a focusing lens adapted to focus an image reflected by the barcode of the product; and a linear sensor array adopted to receive the image focused by the focusing lens, wherein the reflective image has different levels between the left side and the right side. - View Dependent Claims (2, 3, 4)
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5. An optical system used in a barcode scanner for reading a barcode of a product, the optical system comprising:
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a light source adapted to emit a dot-shaped light beam onto the barcode of the product; a standing cylindrical lens adapted to expand the dot-shaped light beam produced by said light source as a line-shaped light beam onto the barcode of the product in a slanting angle; a focusing lens adapted to focus an image reflected by the barcode of the product; a linear sensor array; and reflector means mounted in the midway of the focal distance of said focusing lens and adapted to reflect said image onto said linear sensor array, the light path of said reflector means being overlapped with the light path of said focusing lens to form a light path overlap region. - View Dependent Claims (6, 7, 8, 9)
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10. An optical system used in a barcode scanner for reading a barcode of a product, the optical system comprising:
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a light source adapted to emit a dot-shaped light beam onto the barcode of the product; a standing cylindrical lens adapted to expand the dot-shaped light beam produced by said light source as a line-shaped light beam onto the barcode of the product in a slanting angle; a focusing lens adapted to focus an image reflected by the barcode of the product; a linear sensor array adapted to receive the image focused by said focusing lens; and shaking means adapted to cause reciprocation of the light beam in direction perpendicular to the light path of said light source. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification