Optical reading head having a displaceable light source for scanning a target having surface structure
First Claim
1. A method of varying a spot size on an object being illuminated by an optical reading device, comprising the steps of:
- emitting light from a light source;
focussing said emitted light onto an object by projection optics having an optical axis;
arranging light receiving optics to receive light reflected from the object; and
displacing said light source along said optical axis relative to said projection optics.
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Accused Products
Abstract
An optical reading device has projection optics which have an optical axis and focus light emitted by a light source present in a reading head, and having light receiving optics, arranged horizontally with respect to the optical axis, for receiving light focused by the projection optics and reflected back from an object. The light source can be displaced along the optical axis, relative to the projection optics, in order, during the scanning of pattern originals, to be able to change the size of the scanning light point in accordance with the original structure, without a displacement of the light receiving optics being necessary.
69 Citations
24 Claims
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1. A method of varying a spot size on an object being illuminated by an optical reading device, comprising the steps of:
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emitting light from a light source; focussing said emitted light onto an object by projection optics having an optical axis; arranging light receiving optics to receive light reflected from the object; and displacing said light source along said optical axis relative to said projection optics. - View Dependent Claims (2, 3, 4)
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5. An optical reading device comprising:
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a light source which emits light; projection optics which focus said light onto an object, said projection optics having an optical axis; light receiving optics which receives light focussed by said projection optics and reflected back from the object; and displacing means for displacing said light source along said optical axis relative to said projection optics. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification