Light beam scanning pen, scan module for the device and method of utilization

• US 5,932,860 A
• Filed: 08/11/1997
• Issued: 08/03/1999
• Est. Priority Date: 11/15/1990
• Status: Expired due to Term

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: GeoLabs, Inc.
• Inventors: Plesko, George A.
• Primary Examiner(s): LEE, MICHAEL GUNYOUNG
• Application Number:
  US08/909,165
• Time in Patent Office: 722 Days
• Field of Search: 235/454, 235/462.32, 235/462.33, 235/462.35, 235/462.37, 235/462.38, 235/462.46, 235/462.49, 235/472.01, 235/472.02, 235/472.03, 250/353, 250/275, 359/224, 359/199, 359/213, 359/872
• US Class Current: 235/454
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: G02B 26/101 with both horizontal and vertical deflecting means, e.g. raster or XY scanners colour television using laser beams scanning a display screen H04N9/3129
• CPC Class Codes: G02B 26/105 with one or more pivoting mirrors or galvano-mirrors G02B26/101 takes precedence
• CPC Class Codes: G02B 26/121 Mechanical drive devices for polygonal mirrors
• CPC Class Codes: G02B 3/14 of variable focal length
• CPC Class Codes: G06K 2207/1013 Multi-focal
• CPC Class Codes: G06K 2207/1016 Motor control or optical moving unit control
• CPC Class Codes: G06K 2207/1017 Programmable
• CPC Class Codes: G06K 7/10594 Beam path
• CPC Class Codes: G06K 7/10643 Activating means
• CPC Class Codes: G06K 7/10653 using flexible or piezoelectric means
• CPC Class Codes: G06K 7/10673 Parallel lines
• CPC Class Codes: G06K 7/10762 Relative movement
• CPC Class Codes: G06K 7/10772 Moved readers, e.g. pen, wand
• CPC Class Codes: G06K 7/10811 Focalisation
• CPC Class Codes: G06K 7/10871 randomly oriented data-fields, code-marks therefore, e.g. concentric circles-code
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners
• CPC Class Codes: H02K 2201/12 Transversal flux machines
• CPC Class Codes: H02K 26/00 Machines adapted to function as torque motors, i.e. to exert a torque when stalled
• CPC Class Codes: H02K 33/06 with polarised armatures
• CPC Class Codes: H02K 33/16 : with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
• CPC Class Codes: H02K 7/06 : Means for converting reciprocating motion into rotary motion or vice versa
• CPC Class Codes: H02K 7/065 : Electromechanical oscillators; Vibrating magnetic drives
• CPC Class Codes: H03K 17/94 : characterised by the way in which the control signals are generated
• CPC Class Codes: H03K 17/941 : using an optical detector H03K17/968 takes precedence
• CPC Class Codes: H03K 17/9631 : using a light source as part of the switch

Abstract

A high speed non-contact beam scanning device sized and shaped to provide the ergonomic benefits of a pen or wand, yet can scan a wide angle moving beam across an information-bearing target in one or two dimensional scan patterns such as lines, rasters or other patterns in order to read information therefrom. The device is well suited for reading one or two dimensional bar-code or other printed matter. In order to achieve the high density optical packaging necessary for its high performance to size benefits the device employs a novel in-line or "axial" gyrating, or "axial" scan element. The axial scan element can accept an input light beam at one end and cause the light beam to emerge from its opposite end as a scanned beam, propagating in the same general forward direction the light beam had upon entering the element. Reflected light, which carries information contained on the target, is collected by an internal non-imaging light collector and is processed by signal processing electronics. All components are integrated into a thin low mass module small enough to fit in a pen. The device is achievable by a cable or by wireless communication.

Claims

1. A device for providing angular displacement of a light beam in a direction selected from the X and Y directions with respect to a Z-axis, comprising:

a light beam deflecting means for redirecting said light beam;

a flexible mounting means for mounting said light beam deflecting means and defining a Z-axis, said mounting means being capable of angular displacement about the X or Y direction; and

a distortion means proximate said mounting means for introducing a distortion force in said mounting means to cause angular displacement of said mounting means about at least one of said X and Y directions.

2. The device of claim 1, wherein said light beam deflecting means is a mirror.

3. The device of claim 1, wherein said flexible mounting means comprises a spring having different spring constants for angular displacements about said X and Y directions.

4. The device of claim 3, wherein said distortion means is a piezoelectric distortion means.

5. The device of claim 3, wherein said flexible mounting means has folded arms.

6. The device of claim 5, wherein said distortion means is a piezoelectric distortion means.

7. The device of claim 1, wherein said flexible mounting means is a flexible ribbon suspension.

8. The device of claim 7 wherein said ribbon suspension is made from plastic film.

9. The device of claim 1, wherein said distortion means includes:

a first magnetic core element attached to said mounting means for angular displacement therewith, said first core element producing a first magnetic field in a first direction; and

a first coil means proximate said first core element, said first core element and said first coil means introducing an angular distortion force in said flexible mounting means about at least one of said X and Y directions.

10. The device of claim 9, wherein said flexible mounting means has flexible folded arms permitting angular displacement about said X and Y directions.

11. The device of claim 9, wherein said distortion means further includes:

a second magnetic core element attached to said mounting means for angular displacement therewith, said second core element producing a magnetic field generally perpendicular to said first magnetic field and a second coil means proximate said second core element , said second core element and said second coil means an angular distortion force in said flexible mounting means about at least one of said X and Y directions.

12. The device of claim 9, wherein said distortion means further includes a piezoelectric element.

13. A device for providing angular displacement of a light beam about a direction selected from the X and Y directions with respect to a Z axis comprising:

an entrance aperture at a first end of said device for admitting an incoming light beam;

a first mirror disposed to receive and reflect said incoming light beam;

a flexible mounting means mounting said first mirror, said mounting means defining said Z axis, and being capable of angular displacement about the X and Y directions;

distortion means for inducing angular displacement of said mounting means about the X or Y directions;

a second mirror disposed generally parallel to said first mirror to receive said reflected beam from said first mirror;

an exit aperture at a second end of said device opposite said first end, said exit aperture being disposed to permit said beam reflected from said second mirror to exit said device as a scanned beam of light proceeding in the same general direction as said incoming beam.

14. A device according to claim 13 further including:

a second flexible mounting means mounting said second mirror, said second mounting means being capable of angular displacements about said X and Y directions independently of said first mounting means;

and a second distortion means for inducing angular displacement of said second mounting means about the X or Y directions to cause generally independent movement of said second mirror with respect to said first mirror.

15. The device of claim 14, wherein said distortion means includes a first magnetic core producing a magnetic field in a plane defined by said X and Y directions and mounted to said flexible mounting means;

and a coil means for introducing a force in said first magnetic core to cause angular displacement of said flexible mounting means and first mirror about said X and Y directions.

16. A gyrating optical beam deflector comprising:

a generally planar flexible member, the plane of said flexible member defining a Z axis perpendicular to said plane and mutually perpendicular X and Y axis in said plane;

a support coupled to said flexible member at a plurality of spaced apart locations so as to permit flexing of said flexible member intermediate said locations;

an optical element coupled to said flexible member adjacent said locations; and

means coupled to said flexible member for applying a force thereto so as to flex said flexible member and rotate said optical element about said X axis.

17. A beam deflector according to claim 16, wherein said force-applying means applies a force to said flexible member so as to flex said flexible member and rotate said optical element about said X axis and said Y axis.

18. A light beam scanner according to claim 17, wherein the other of said mirrors is secured to said support.

19. A light beam scanner according to claim 17, wherein said flexible member includes a perimeter area, a central area, and a plurality of arms connecting said perimeter area with said central area, and said plurality of locations are disposed on said perimeter area so as to permit flexing of said arms and said central area.

20. A light beam scanner according to claim 16, wherein said arms have a generally serpentine shape.

21. A light beam scanner according to claim 16, wherein said arms have a generally spiral shape.

22. A light beam scanner according to claim 21, wherein said flexing means includes an electromagnetic motor.

23. A light beam scanner according to claim 16, wherein said electromagnetic motor includes a coil coupled to said support and a magnet coupled to said flexible member.