OPTICAL SYSTEM FOR BARCODE SCANNER
An optical system used in a barcode scanner is disclosed to include a standing cylinder lens, a light source that emits a light beam through the standing cylinder lens onto the barcode of the product to be scanned, a focusing lens that focuses the image reflected by the barcode, a linear sensor array, and a slanted arranged reflector that reflects the image focused by the focusing lens onto the linear sensor array for reading. The light path of the image focused by the focusing lens onto the reflector and the light path of the image reflected by the reflector onto the linear sensor array are overlapped, forming a light path overlap region.
1 . An optical system used in a barcode scanner for reading a barcode of a product, the optical system comprising a light source, a standing cylinder lens, a focusing lens, reflector means and a linear sensor array arranged on one same plane, wherein:
said light source is adapted to emit a light beam through said standing cylinder lens onto a barcode of a product;
said focusing lens is adapted to focus an image reflected by the barcode of the product, upon which the light beam emitted by said light source through said standing cylinder lens onto said reflector;
said reflector means is adapted to reflect the image focused by said focusing lens onto said linear sensor array for reading;
the light path of the image focused by said focusing lens onto said reflector and the light path of the image reflected by said reflector onto said linear sensor array are overlapped, forming a light path overlap region.
2 . The optical system as claimed in claim 1 , wherein said light source is comprised of a laser diode and a collimator.
3 . The optical system as claimed in claim 1 , wherein said light source is comprised of a light emitting diode and a collimator.
4 . The optical system as claimed in claim 1 , which said reflector means is a slanted arranged reflector.
5 . The optical system as claimed in claim 1 , which said reflector means comprises a plurality of reflectors arranged on said same plane.
6 . The optical system as claimed in claim 1 , further comprising slight oscillation means adapted to slightly oscillate the light beam emitted by said light source in direction perpendicular to the light path of said light source.
7 . The optical system as claimed in claim 1 , wherein said slight oscillation means is adapted to slightly oscillate said light source.
8 . The optical system as claimed in claim 1 , wherein said slight oscillation means is adapted to slightly oscillate said standing cylinder lens.
9 . The optical system as claimed in claim 8 , wherein said slight oscillation means is adapted to slightly oscillate said standing cylinder lens by means of applying different voltages to said standing cylinder lens to cause said standing cylinder lens to change a crystal structure thereof.