Aiming aid for optical data reading

• US 6,223,986 B1
• Filed: 04/10/1998
• Issued: 05/01/2001
• Est. Priority Date: 04/17/1997
• Status: Expired due to Term

• Current Assignee: PSC Scanning, Inc. (Datalogic ADC Incorporated)
• Original Assignee: PSC Scanning, Inc. (Datalogic ADC Incorporated)
• Inventors: Bobba, Mohan L., Hofer, John A., Rudeen, Robert W.
• Primary Examiner(s): Frech, Karl D.
• Application Number:
  US09/058,501
• Time in Patent Office: 1,117 Days
• Field of Search: 235/462.2, 235/462.21, 235/462.45, 235/472.01, 235/472.02, 235/472.03, 235/473, 235/453, 235/454, 359/15-19, 250/566
• US Class Current: 235/462.2
• CPC Class Codes: G06K 2207/1011 Aiming
• CPC Class Codes: G06K 7/10683 Arrangement of fixed elements

Abstract

A data reading systems including an aiming aid system which creates a highly visible target or image in the scan volume at a preferred location for placement of the article to be scanned. In a preferred application, an overhead bar code scanner employs a rotating polygon mirror which scans one or more laser beams off pattern mirrors creating a complex pattern of scan lines down into the scan volume whereby the aiming aid is created by directing a laser beam onto a scanning mirror positioned on top of the polygon mirror generally along the rotational axis of the polygon mirror and then directing that beam out into the scan volume in the desired pattern, such as a circular aiming aid. Alternately, the aiming aid may be a multi-dimensional graphical image formed by holographic or diffractive optics.

Claims

1. A data reading system for scanning items in a scan volume., comprising a data reader positioned above a scan volume;

a light source for producing a reading beam;

a polygon mirror having an axis of rotation and a plurality of mirror facets disposed about an outer periphery, the polygon mirror being rotated about the axis for scanning the reading beam to project a scan pattern into the scan volume for reading objects in the scan volume;

a secondary scan mirror disposed on one end of the polygon mirror along the axis, for producing an aiming aid in the scan volume, wherein the aiming aid is formed by a laser beam directed alone a line parallel to the axis of rotation and onto the secondary mirror, whereby the laser beam is scanned by the secondary scanning mirror drawing out a two-dimensional pattern projected into the scan volume.

2. A data reading system according to claim 1 wherein the laser beam draws out a circular pattern comprising the aiming aid.

3. A data reading system according to claim 1 further comprising

a tertiary scanning mirror disposed on the end of the polygon mirror wherein the aiming aid is formed by the laser beam scanned by the secondary scanning mirror and the tertiary mirror and projected into the scan volume.

4. A data reading system according to claim 1 wherein the aiming aid is selected from the group consisting of:

a circle, a rectangle, an ellipse.

5. A data reading system for scanning items in a scan volume, comprising

a data reader mounted in a fixed position above a scan volume and projecting a scan pattern downwardly into the scan volume;

means for producing an aiming aid in the scan volume for assisting a user in positioning an item to be scanned,

wherein the aiming aid comprises a multi-dimensional graphics image projected into the scan volume.

6. A data reading system according to claim 5 wherein the data reader is constructed and arranged to read labels on parcels and wherein the image comprises a graphical representation of a parcel label.

7. A data reading system according to claim 5 wherein the image comprises a company logo.

8. A data reader according to claim 5 wherein the data reader is selected from the group consisting of:

laser scanner, CCD scanner, and LED scanner.

9. A data reading system for scanning items in a scan volume, comprising

a data reader mounted in a fixed position above a scan volume and protecting a scan pattern downwardly into the scan volume;

a laser beam source producing a laser beam along a beam path;

a diffractive optic disposed in the beam path and forming a multi-dimensional image in the scan volume comprising an aiming aid for assisting a user in positioning an item to be scanned.

10. A data reading system for scanning items in a scan volume, comprising

a data reader mounted in a fixed position above a scan volume and projecting a scan pattern downwardly into the scan volume;

means for producing an aiming aid in the scan volume for assisting a user in positioning an item to be scanned,

wherein the means for forming an aiming aid comprises a laser beam source producing a laser beam along a beam path and a holographic element disposed in the beam path and forming a multi-dimensional image.

11. A method of data reading comprising the steps of

generating a scan pattern and passing the scan pattern into a scan volume;

passing a laser beam through an optical system and forming a multi-dimensional graphic image within the scan volume;

permitting the user to use the graphic image as a guide for placing an article being scanned at a desired location within the scan volume.

12. A method according to claim 11 wherein the optical system comprises a diffractive optic.

13. A method according to claim 11 wherein the optical system comprises a holographic optic.

14. A method according to claim 11 further comprising

reading labels on parcels being placed in the scan volume;

forming the multi-dimensional image into a graphical representation of a parcel label.

15. A method according to claim 11 further comprising

forming the multi-dimensional image into a company logo.

16. A method according to claim 11 further comprising forming the multi-dimensional image into a two-dimensional geometric figure.

17. A method of data reading comprising the steps of

generating a scan pattern and passing the scan pattern into a scan volume from a position outside the scan volume;

projecting a multi-dimensional aiming aid into the scan volume at a desired position;

using the aiming aid as a guide for placing an article being scanned at a desired position within the scan volume.

18. A method according to claim 17 further comprising forming the aiming aid as a graphic image by passing a laser beam through a diffractive optic.

19. A method according to claim 17 further comprising

reading labels on parcels being placed in the scan volume;

forming the graphic image into a graphical representation of a parcel label.

20. A method according to claim 17 further comprising forming the multi-dimensional aiming aid as a two-dimensional geometric figure.

21. A method according to claim 17 further comprising

providing a plurality of aiming aids corresponding to different types of items;

sensing a type of item being placed in the scan volume;

automatically selecting a given aiming aid corresponding to the type of item having been sensed;

projecting the given aiming aid into the scan volume.

22. A method according to claim 17 further comprising

providing a plurality of aiming aids;

allowing a user to select one of the plurality of aiming aids;

projecting the given aiming aid into the scan volume.