Optical reader
First Claim
1. An optical reader comprising:
- a light source for emitting an optical beam;
a first rotary multiface mirror means, including a plurality of reflecting surfaces disposed about the periphery of a rotary center shaft, for reflecting the optical beam emitted from said light source from said reflecting surfaces along a first optical path to scan a surface to be scanned; and
a second rotary multiface mirror means, including a plurality of reflecting surfaces disposed about the periphery of a rotary center shaft, said reflecting surfaces of said second rotary mirror means being synchronously rotated with said first rotary multiface mirror means, for reflecting an information beam reflected from the surface to be scanned along a second optical path to an optoelectric transforming means;
said first optical path being distinct from said second optical path to thereby increase the signal to noise ratio of said information beam.
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Accused Products
Abstract
The present invention relates to an optical reader for scanning a surface to be scanned by using information beam ray such as laser beam ray and optically reading a recorded information such as bar code recorded in the surface to be scanned. The optical reader is constituted such that optical beam emitted from a light source is reflected on a first rotary multiface mirror to scan on a surface to be scanned, and information beam reflected on the surface to be scanned is reflected on a second rotary multiface mirror to guide to an opto-electric transforming means. A scanning optical path for permitting the optical beam from the light source to pass therealong is formed independently from a reflecting optical path for permitting the information beam from the surface to be scanned to pass therealong. A condensing lens system including a bore diameter large enough to cover the scanning optical path and reflecting optical path as well as a single optical axis is disposed between the surface to be scanned and the first and second rotary multiface mirrors.
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Citations
18 Claims
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1. An optical reader comprising:
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a light source for emitting an optical beam; a first rotary multiface mirror means, including a plurality of reflecting surfaces disposed about the periphery of a rotary center shaft, for reflecting the optical beam emitted from said light source from said reflecting surfaces along a first optical path to scan a surface to be scanned; and a second rotary multiface mirror means, including a plurality of reflecting surfaces disposed about the periphery of a rotary center shaft, said reflecting surfaces of said second rotary mirror means being synchronously rotated with said first rotary multiface mirror means, for reflecting an information beam reflected from the surface to be scanned along a second optical path to an optoelectric transforming means; said first optical path being distinct from said second optical path to thereby increase the signal to noise ratio of said information beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical reader for reading coded information on a surface to be scanned, comprising:
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an optical source for emitting an optical beam; scanning rotary multiface mirror means, disposed on a rotary center shaft and having a plurality of reflecting surfaces disposed about the periphery of said center shaft with each of said reflecting surfaces being disposed at one of at least three different angles relative to the axis of said center shaft, for reflecting said optical beam from said reflecting surfaces to form at least three scanning beams each having a distinct optical path in accordance with said at least three different angles; reflecting optical means, disposed between said scanning mirror means and said surface to be scanned, for directing two of said at least three scanning beams to a common intersection with a third scanning beam on said surface to be scanned; photoelectric conversion means for photoelectrically converting at least three return beams, generated by said at least three scanning beams being reflected from said surface to be scanned, into electrical signals; and condensing rotary multiface mirror means, synchronously rotatable with said scanning rotary multiface mirror means and disposed between said surface to be scanned and said photoelectric conversion means, for bypassing said reflecting optical means and directing said at least three return beams onto said photoelectric conversion means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification