Laser scanning assembly having an improved scan angle-multiplication factor
First Claim
1. A laser scanning assembly comprising:
- first and second rotating mirrors supported on a support structure, rotatable about a common axis of rotation, by an electrical motor;
wherein said first and second rotating mirrors have normal vectors that are coplanar with each other and said rotational axis, and which form an acute angle substantially less than 90 degrees so as to provide said laser scanning assembly with a scan angle multiplication factor that is greater than 2.0.
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Abstract
A laser scanning system for generating a laser scanning pattern in a scanning field, while amplifying the scan-angle multiplication factor of rotating mirrors employed therein. The laser scanning system employs rotatable laser scanning assembly having an axis of rotation and first and second rotating mirrors with normal vectors that are coplanar with each other and said rotational axis, and which form an acute angle substantially less than 90 degrees so as to provide a laser scanning assembly with a scan angle multiplication factor that is greater than 2.0. A cluster of stationary mirrors mounted about the first and second rotating mirrors, for sweeping a laser beam off the cluster of stationary mirrors after a laser beam has been reflected off the first rotating mirror, then reflected off the second rotating mirror, and then directed outwardly towards an array of pattern mirrors, so as to generate a resultant laser scanning pattern within the scanning field.
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Citations
16 Claims
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1. A laser scanning assembly comprising:
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first and second rotating mirrors supported on a support structure, rotatable about a common axis of rotation, by an electrical motor; wherein said first and second rotating mirrors have normal vectors that are coplanar with each other and said rotational axis, and which form an acute angle substantially less than 90 degrees so as to provide said laser scanning assembly with a scan angle multiplication factor that is greater than 2.0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A laser scanning system for generating a laser scanning pattern while amplifying the scan-angle multiplication factor of rotating mirrors employed therein, said laser scanning system comprising:
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a rotatable laser scanning assembly having an axis of rotation and first and second rotating mirrors with normal vectors that are coplanar with each other and said rotational axis, and which form an acute angle substantially less than 90 degrees so as to improve said laser scanning system with a scan angle multiplication factor that is greater than 2.0; and a cluster of stationary mirrors mounted about said first and second rotating mirrors, for sweeping a laser beam off said cluster of stationary mirrors after, a laser beam has been reflected off said first rotating mirror, then reflected off said second rotating mirror, and then directed outwardly towards an array of pattern mirrors, so as to generate a resultant laser scanning pattern within a scanning field.
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13. A laser scanning system comprising:
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a mirror support structure with a hollow center and supporting a double-side rotating mirror mounted along the axis of rotation, and pair of second rotating mirrors disposed about the axis of rotation above said double-sided rotating mirror; a motor for rotating said, mirror support structure about said axis of rotation; a first light collection mirror having a first aperture; a first photodiode mounted below said motor; a second light collection mirror having a second aperture; a second photodiode mounted above said motor; a first cluster of stationary mirrors arranged about said first rotating mirror for reflecting laser scanning beams towards said pair of second rotating mirrors. - View Dependent Claims (14, 15)
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16. Method of generating a scanning pattern for scanning a bar code symbol within a scanning field, said method comprising the steps of:
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(a) rotating a laser scanning assembly about an axis of rotation, wherein said laser scanning assembly has first and second rotating mirrors with normal vectors that are coplanar with each other and said rotational axis, and which form an acute angle substantially less than 90 degrees so as to provide said laser scanning assembly with a scan angle multiplication factor that is greater than 2.0; (b) directing a laser beam onto said first rotating mirror as said first and second rotating mirror rotate about said axis of rotation; (c) said first rotating mirror reflectively sweeping the reflected laser beam off a cluster of stationary mirrors mounted about said first and second rotating mirrors; (d) said cluster of stationary mirrors reflecting the laser beam towards said second rotating mirror; (e) said second rotating mirror reflectively sweeping the laser beam outwardly towards an array of stationary pattern mirrors; (f) said array of stationary pattern mirrors reflecting the laser beam so as to generate a resultant laser scanning pattern within the scanning field.
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Specification