Bioptical laser scanning system providing 360 degree of omnidirectional bar code symbol scanning coverage at point of sale station

• US 7,086,597 B2
• Filed: 09/24/2004
• Issued: 08/08/2006
• Est. Priority Date: 01/11/2002
• Status: Expired due to Fees

• Current Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Original Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Inventors: Good, Timothy
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US10/950,174
• Publication Number:
  US 20050061888A1
• Time in Patent Office: 683 Days
• Field of Search: 23546201-46248, 235/472.01, 235/472.02, 235/472.03, 235/454, 235/455, 235/470, 235/494
• US Class Current: 235/462.39
• CPC Class Codes: A47F 9/04 Check-out counters, e.g. for self-service stores
• CPC Class Codes: G06K 7/10623 Constructional details
• CPC Class Codes: G06K 7/10693 for omnidirectional scanning
• CPC Class Codes: G06Q 20/20 Point-of-sale [POS] network systems
• CPC Class Codes: G06Q 20/201 Price look-up processing, e.g. updating
• CPC Class Codes: G06Q 20/202 Interconnection or interaction of plural electronic cash registers [ECR] or to host computer, e.g. network details, transfer of information from host to ECR or from ECR to ECR
• CPC Class Codes: G06Q 20/203 Inventory monitoring
• CPC Class Codes: G06Q 20/204 comprising interface for record bearing medium or carrier for electronic funds transfer or payment credit
• CPC Class Codes: G06Q 30/02 Marketing; Price estimation or determination; Fundraising
• CPC Class Codes: G07G 1/0045 with a code reader for reading of an identifying code of the article to be registered, e.g. barcode reader or radio-frequency identity [RFID] reader
• CPC Class Codes: G07G 1/0054 with control of supplementary check-parameters, e.g. weight or number of articles

Abstract

A bioptical laser scanning system employing a plurality of laser scanning stations about a two independently controlled rotating polygonal mirrors. The system has an ultra-compact construction, ideally suited for space-constrained retail scanning environments, and generates a 3-D omnidirectional laser scanning pattern between the bottom and side-scanning windows during system operation. The laser scanning pattern of the present invention comprises plurality of groups of intersecting laser scanning planes that form a complex omni-directional 3-D laser scanning pattern within a 3-D scanning volume capable of scanning a bar code symbol located on the surface of an object presented within the 3-D scanning volume at any orientation and from any direction at the POS station so as to provide 360° of omnidirectional bar code symbol canning coverage at the POS station.

Claims

1. A bioptical laser scanning system providing 360°

of omnidirectional bar code symbol scanning coverage at a point of sale (POS) station, said bioptical laser scanning system comprising;

a horizontal section integrally connected to a vertical section;

horizontal-scanning window formed in said horizontal section;

a vertical-scanning window formed in said vertical section, and being substantially orthogonal to said horizontal-scanning window;

a first laser scanning plane generation mechanism disposed within said vertical section, for generating and projecting a first plurality of laser scanning planes through said horizontal-scanning window; and

a second laser scanning plane generation mechanism disposed within said horizontal section for generating and projecting generate and project a second plurality of laser scanning planes through said horizontal-scanning window;

whereby said first and second pluralities of laser scanning planes (i) intersect within predetermined scan regions contained within a 3-D scanning volume defined between said horizontal-scanning and vertical-scanning windows, and (ii) generate a plurality of groups of quasi-orthogonal laser scanning planes within said 3-D scanning volume, and

wherein said plurality of groups of quasi-orthogonal laser scanning planes form a complex omni-directional 3-D laser scanning pattern within said 3-D scanning volume capable of scanning a bar code symbol located on the surface of an object presented within said 3-D scanning volume at any orientation and from any direction at said POS station so as to provide 360°

of omnidirectional bar code symbol scanning coverage at said POS station.

2. The bioptical laser scanning system of claim 1, which further comprises a first laser beam production module for producing a first laser beam, and a second laser beam production module for producing a second laser beam.

3. The bioptical laser scanning system of claim 2,

wherein said first laser scanning plane generation mechanism comprises said first laser beam production module and a first plurality of laser beam folding mirrors disposed within said horizontal section;

and

wherein said second laser scanning plane generation mechanism comprises said second laser beam production module and a second plurality of laser beam folding mirrors disposed within said vertical section.

4. The bioptical laser scanning system of claim 3,

wherein said first laser scanning plane generation mechanism further comprises a first polygonal scanning element having multiple reflective surfaces rotating about a first axis of rotation, for scanning said first laser beam and producing said first laser scanning beam that reflects off said first plurality of laser beam folding mirrors to generate and project said first plurality of laser scanning planes through said horizontal-scanning window;

and

wherein said second laser scanning plane generation mechanism further comprises a second polygonal scanning element having multiple reflective surfaces rotating about a second axis of rotation, for scanning said second laser beam and producing said second laser scanning beam that reflects off said second plurality of laser beam folding mirrors to generate and project said second plurality of laser scanning planes through said vertical-scanning window.

5. The bioptical laser scanning system of claim 1, wherein the height dimension of the said horizontal section is less than about 4.5 inches for installation of said horizontal section within a countertop surface at said POS.

6. The bioptical laser scanning system of claim 1, wherein said plurality of groups of quasi-orthogonal laser scanning planes comprises over 60 different laser scanning planes cooperating within said 3-D scanning volume to generate said complex omni-directional 3-D laser scanning pattern.

7. The bioptical laser scanning system of claim 1, wherein each said group of quasi-orthogonal laser scanning planes comprises (i) a plurality of substantially-vertical laser scanning planes for reading bar code symbols having bar code elements (i.e., ladder type bar code symbols) that are oriented substantially horizontal with respect to said horizontal-scanning window, and (ii) a plurality of substantially-horizontal laser scanning plane for reading bar code symbols having bar code elements (i.e., picket-fence type bar code symbols) that are oriented substantially vertical with respect to said horizontal-scanning window.

8. The bioptical laser scanning system of claim 2, wherein said first laser beam production module comprises a first visible laser diode (VLD), and said second laser beam production module comprises a second visible laser diode (VLD).

9. The bioptical laser scanning system of claim 3, wherein said first plurality of laser beam folding mirrors and said first laser beam production module cooperate with first and second light collecting/focusing optical elements and first and second photodetectors disposed within said horizontal section to form first and second scanning stations disposed about said first polygonal scanning element, and

wherein the light collecting/focusing optical element within each said laser scanning station collects light from predetermined scan regions within said 3-D scanning volume and focuses such collected light onto the photodetector to produce an electrical signal having an amplitude proportional to the intensity of light focused thereon, and said electrical signal being supplied to analog/digital signal processing circuitry for processing analog and digital scan data signals derived therefrom to perform bar code symbol reading operations.

10. The bioptical laser scanning system of claim 9, wherein said second plurality of laser beam folding mirrors and said second laser beam production module cooperate with a third light collecting/focusing optical element and a third photodetector disposed within said vertical section to form third scanning station disposed about said second polygonal scanning element, and

wherein the light collecting/focusing optical element within said third laser scanning station collects light from predetermined scan regions within said 3-D scanning volume and focuses such collected light onto the photodetector to produce an electrical signal having an amplitude proportional to the intensity of light focused thereon, and said electrical signal being supplied to analog/digital signal processing circuitry for processing analog and digital scan data signals derived therefrom to perform bar code symbol reading operations.

11. The bioptical laser scanning system of claim 4, wherein said first polygonal scanning element comprises a first polygonal scanning mirror having a first plurality of rotating mirror facets, and wherein said second polygonal scanning element comprises a second polygonal scanning mirror having a second plurality of rotating mirror facets.

12. The bioptical laser scanning system of claim 11, wherein said second plurality of rotating mirror facets on said second polygonal scanning mirror are classifiable into a first class of facets having High Elevation (HE) angle characteristics, and a second class of facets having Low Elevation (LE) angle characteristics.

13. The bioptical laser scanning system of claim 4, wherein said complex omni-directional 3-D laser scanning pattern is generated from said horizontal-scanning window and said vertical-scanning window during the revolution of said first and second polygonal scanning elements.

14. The bioptical laser scanning system of claim 4, wherein said first polygonal scanning element is disposed within said horizontal section, and said second polygonal scanning element is disposed within said vertical section.

15. A bioptical laser scanning system providing 360°

of omnidirectional bar code symbol scanning coverage at a point of sale (POS) station, said bioptical laser scanning system comprising;

a horizontal section integrally connected to a side section;

a horizontal-scanning window formed in said horizontal section;

a side-scanning window formed in said side section, and being substantially orthogonal to said horizontal-scanning window;

a first laser scanning plane generation mechanism disposed within said side section, for generating and projecting a first plurality of laser scanning planes through said horizontal-scanning window; and

a second laser scanning plane generation mechanism disposed within said horizontal section for generating and projecting a second plurality of laser scanning planes through said horizontal-scanning window;

whereby said first and second pluralities of laser scanning planes (i) intersect within predetermined scan regions contained within a 3-D scanning volume defined between said horizontal-scanning and side-scanning windows, and (ii) generate a plurality of groups of quasi-orthogonal laser scanning planes within said 3-D scanning volume, and

wherein said plurality of groups of quasi-orthogonal laser scanning planes form a complex omni-directional 3-D laser scanning pattern within said 3-D scanning volume capable of scanning a bar code symbol located on the surface of an object presented within said 3-D scanning volume at any orientation and from any direction at said POS station so as to provide 360°

of omnidirectional bar code symbol scanning coverage at said POS station.

16. The bioptical laser scanning system of claim 15, which further comprises a first laser beam production module for producing a first laser beam, and a second laser beam production module for producing a second laser beam.

17. The bioptical laser scanning system of claim 16, wherein

said first laser scanning plane generation mechanism comprises said first laser beam production module, and a first plurality of laser beam folding mirrors disposed within said horizontal section;

and

said second laser scanning plane generation mechanism comprises said second laser beam production module, and a second plurality of laser beam folding mirrors disposed within said side section.

18. The bioptical laser scanning system of claim 17, wherein

said first laser scanning plane generation mechanism further comprises a first polygonal scanning element having multiple reflective surfaces rotating about a first axis of rotation, for scanning said first laser beam and producing said first laser scanning beam that reflects off said first plurality of laser beam folding mirrors to generate and project said first plurality of laser scanning planes through said horizontal-scanning window;

and

said second laser scanning plane generation mechanism further comprises a second polygonal scanning element having multiple reflective surfaces rotating about a second axis of rotation, for scanning said second laser beam and producing said second laser scanning beam that reflects off said second plurality of laser beam folding mirrors to generate and project said second plurality of laser scanning planes through said side-scanning window.

19. The bioptical laser scanning system of claim 15, wherein the height dimension of the said horizontal section is less than about 4.5 inches for installation of said horizontal section within a countertop surface at said POS.

20. The bioptical laser scanning system of claim 15, wherein said plurality of groups of quasi-orthogonal laser scanning planes comprises over 60 different laser scanning lanes cooperating within said 3-D scanning volume to generate said complex omni-directional 3-D laser scanning pattern.

21. The bioptical laser scanning system of claim 15, wherein each said group of quasi-orthogonal laser scanning planes comprises (i) a plurality of substantially-side laser scanning planes for reading bar code symbols having bar code elements (i.e., ladder type bar code symbols) that are oriented substantially horizontal with respect to said horizontal-scanning window, and (ii) a plurality of substantially-horizontal laser scanning plane for reading bar code symbols having bar code elements (i.e., picket-fence type bar code symbols) that are oriented substantially side with respect to said horizontal-scanning window.

22. The bioptical laser scanning system of claim 16, wherein said first laser beam production module comprises a first visible laser diode (VLD), and said second laser beam production module comprises a second visible laser diode (VLD).

23. The bioptical laser scanning system of claim 22, wherein said first plurality of laser beam folding mirrors and said first laser beam production module cooperate with first and second light collecting/focusing optical elements and first and second photodetectors disposed within said horizontal housing section to form first and second scanning stations disposed about said first polygonal scanning element, and

wherein the light collecting/focusing optical element within each said laser scanning station collects light from predetermined scan regions within said 3-D scanning volume and focuses such collected light onto the photodetector to produce an electrical signal having an amplitude proportional to the intensity of light focused thereon, and said electrical signal being supplied to analog/digital signal processing circuitry for processing analog and digital scan data signals derived therefrom to perform bar code symbol reading operations.

24. The bioptical laser scanning system of claim 23, wherein said second plurality of laser beam folding mirrors and said second laser beam production module cooperate with a third light collecting/focusing optical element and a third photodetector disposed within said side housing section to form third scanning station disposed about said second polygonal scanning element, and

wherein the light collecting/focusing optical element within said third laser scanning station collects light from predetermined scan regions within said 3-D scanning volume and focuses such collected light onto the photodetector to produce an electrical signal having an amplitude proportional to the intensity of light focused thereon, and said electrical signal being supplied to analog/digital signal processing circuitry for processing analog and digital scan data signals derived therefrom to perform bar code symbol reading operations.

25. The bioptical laser scanning system of claim 18, wherein said first polygonal scanning element comprises a first polygonal scanning mirror having a first plurality of rotating mirror facets, and wherein said second polygonal scanning element comprises a second polygonal scanning mirror having a second plurality of rotating mirror facets.

26. The bioptical laser scanning system of claim 25, wherein said second plurality of rotating mirror facets on said second polygonal scanning mirror are classifiable into a first class of facets having High Elevation (HE) angle characteristics, and a second class of facets having Low Elevation (LE) angle characteristics.

27. The bioptical laser scanning system of claim 18, wherein said complex omni-directional 3-D laser scanning pattern is generated from said horizontal-scanning window and said side-scanning window during the revolution of said first and second polygonal scanning elements.

28. The bioptical laser scanning system of claim 18, wherein said first polygonal scanning element is disposed within said horizontal section, and said second polygonal scanning element is disposed within said side section.