Pointer beam for hand-held laser scanner

• US 5,146,463 A
• Filed: 05/20/1991
• Issued: 09/08/1992
• Est. Priority Date: 05/20/1991
• Status: Expired due to Term

• Current Assignee: PSC Scanning, Inc. (Datalogic ADC Incorporated)
• Original Assignee: Spectra-Physics Scanning Systems, Inc.
• Inventors: Rando, Joseph F.
• Primary Examiner(s): Scott, Jr., Leon
• Application Number:
  US07/703,476
• Time in Patent Office: 477 Days
• Field of Search: 372/24, 235/467, 250/235, 250/566
• US Class Current: 372/24
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: G02B 26/108 having one or more prisms as scanning elements
• CPC Class Codes: G02B 27/20 for imaging minute objects, e.g. light-pointer
• CPC Class Codes: G06K 2207/1011 Aiming
• CPC Class Codes: G06K 7/10564 Light sources
• CPC Class Codes: G06K 7/10594 Beam path

Abstract

A laser scanner and method for simultaneously generating both a pointer beam and a scan pattern from a single laser source is provided by multiplexing a laser beam between at least one pointer beam path and at least one scanning beam path. Means for multiplexing include refractive and reflective optical components, and electronic means for modifying one or more properties of the laser beam.

Claims

1. In a laser scanner, an optical arrangement for multiplexing and redirecting a laser beam to simultaneously produce both a laser beam scan pattern and a pointer beam comprising:

means for multiplexing a laser beam between at least one pointer beam path producing a pointer beam and at least one scanning beam path; and

means for redirecting said laser beam from said at least one scanning beam path to produce a laser beam scan pattern.

2. The arrangement of claim 1 wherein said means for multiplexing comprises:

an optical component; and

means for altering the position of said optical component to alter the path of said laser beam.

3. The arrangement of claim 2 wherein said optical component comprises a reflective optical component.

4. The arrangement of claim 3 wherein said reflective optical component comprises first and second mirrors mounted face-to-face in spaced, substantially parallel relationship on a pivot arm and adapted to be cyclically reciprocated in an arc about a pivot axis, said first mirror adapted to receive and reflect a laser beam to said second mirror and said second mirror adapted to receive and reflect said laser beam to at least one pointer beam path and at least one scanning beam path as said pivot arm moves successively through portions of said arc.

5. The arrangement of claim 4

wherein said means for altering the position of said optical component comprises means for cyclically reciprocating said pivot arm in an arc about said pivot axis;

wherein said means for redirecting comprises;

a dithering optical device mounted on a rotatable mount for movement through a scanning arc about a third axis, said dithering optical device adapted to receive and reflect said laser beam from said at least one scanning beam path to produce at least one laser beam scanning beam; and

means for dithering said dithering optical device about said third axis to reflect said laser beam in said at least one scanning beam path to trace at least one scanning beam of a laser scan pattern; and

wherein said arrangement further comprises means for timing the cyclical reciprocation of said pivot arm with the position of said dithering optical device as it moves through each scanning arc.

6. The arrangement of claim 5 wherein said means for timing comprises:

a hinge means for rotating attached to said pivot arm at a first end thereof for rotating said pivot arm through an arc about said pivot axis; and

means for mechanically connecting said pivot arm at a second end thereof to said dithering optical device to move said pivot arm in time with the motion of said dithering optical device as it moves through each scanning arc.

7. The arrangement of claim 4

wherein said means for altering the position of said optical component comprises means for cyclically reciprocating said pivot arm in an arc about said pivot axis;

wherein said means for redirecting comprises;

a rotating optical device mounted for movement repetitively through a rotational cycle about a second axis and having a plurality of primary reflective elements oriented in angularly displaced relation from one to the next about said second axis, each of said primary reflective elements being adapted to receive and reflect a laser light beam from said at least one scanning beam path as said primary reflective elements move successively through a portion of each rotational cycle of said rotating optical device; and

means for rotating said rotating optical device about said second axis; and

wherein said arrangement further comprises means for timing the cyclical reciprocation of said pivot arm with the position of said rotating optical device as it moves through each rotational cycle.

8. The arrangement of claim 7 wherein said means for timing comprises:

a cam mounted on said rotating optical device and positioned for movement about said second axis;

a hinge means for rotating attached to said pivot arm at a first end thereof for rotating said pivot arm through an arc about said pivot axis; and

a cam follower adapted to follow said cam and attached to said pivot arm at a second end thereof, said cam and said cam follower adapted to impart a reciprocating motion to said pivot arm as said rotating optical device moves through portions of each rotational cycle.

9. An arrangement as recited in claim 2 wherein said means for altering the position of said optical component comprises means for rotatably moving said optical component in the path of said laser beam.

10. The arrangement of claim 2 wherein said means for altering the position of said optical component comprises means for cyclically reciprocating said optical component in and out of the path of said laser beam.

11. The arrangement of claim 2 wherein means for altering the position of said optical component comprises means for cyclically reciprocating said optical component while in the path of said laser beam.

12. The arrangement of claim 11 wherein said means for cyclically reciprocating said optical component comprises a rotatable means for hinging said optical component at a first end thereof, and a source of reciprocating mechanical power connected to a second end thereof.

13. The arrangement of claim 2 wherein said optical component comprises a refractive optical component.

14. The arrangement of claim 13 wherein said refractive optical component comprises a transparent polygon mounted for movement repetitively through a rotational cycle about a first axis and having a plurality of faces oriented in angularly displaced relation from one to the next about said first axis, said transparent polygon adapted to transmit and refract a laser beam through pairs of said faces as said transparent polygon moves successively through a portion of each rotational cycle, and transmit and refract said laser beam to at least one pointer beam path and at least one scanning beam path during each of said portions of each rotational cycle.

15. The arrangement of claim 14

wherein said means for altering the position of said optical component comprises means for rotatably moving said transparent polygon about said first axis;

wherein said means for redirecting comprises;

a dithering optical device rotatably mounted for movement through a scanning arc about a third axis, said dithering optical device adapted to receive and reflect said laser beam from said at least one scanning beam path to produce at least one laser beam scanning beam; and

means for dithering said dithering optical device about said third axis to reflect said laser beam in said at least one scanning beam path to trace at least one scanning beam of a laser scan pattern; and

wherein said arrangement further comprises means for timing the rotation of said transparent polygon with the position of said dithering optical device as it moves through each scanning arc.

16. The arrangement of claim 14

wherein said means for altering the position of said optical component comprises means for rotatably moving said transparent polygon about said first axis;

wherein said means for redirecting comprises;

a rotating optical device mounted for movement repetitively through a rotational cycle about a second axis and having a plurality of primary reflective elements oriented in angularly displaced relation from one to the next about said second axis, each of said primary reflective elements being adapted to receive and reflect a laser light beam from said at least one scanning beam path as said primary reflective elements move successively through a portion of each rotational cycle of said rotating optical device; and

means for rotating said rotating optical device about said second axis; and

wherein said arrangement further comprises means for timing the rotation of said transparent polygon with the position of said rotating optical device as it moves through each rotational cycle, said means for timing comprising mounting said transparent polygon on said rotating optical device with said first axis and said second axis in substantial alignment.

17. The arrangement of claim 13 wherein said refractive optical component comprises a transparent spoked window mounted for movement repetitively through a rotational cycle about a first axis, said spoked window having a plurality of spokes extending generally radially from said first axis and separated by radial slots, said spoked window having a central mirror mounted generally along said first axis and positioned to receive and reflect a laser beam, and said spoked window adapted to receive, transmit and refract a laser beam through ones of said spokes to said at least one pointer beam path and, alternately, to transmit said laser beam through ones of said slots to said at least one scanning beam path as said transparent spoked window moves through portions of said rotational cycle.

18. The arrangement of claim 13 wherein said refractive optical component comprises a first transparent prism mounted for cyclically reciprocating into and out of the path of a laser beam, said laser beam directed along said at least one scanning beam path, and said first transparent prism adapted to intercept and refract said laser beam to said at least one pointer beam path when moved into the path of said laser beam.

19. The arrangement of claim 18

wherein said means for altering the position of said optical component comprises means for cyclically reciprocating said first transparent prism into and out of the path of said laser beam;

wherein said means for redirecting comprises;

a dithering optical device mounted on a rotatable mount for movement through a scanning arc about a third axis, said dithering optical device adapted to receive and reflect said laser beam from said at least one scanning beam path to produce at least one laser beam scanning beam; and

means for dithering said dithering optical device about said third axis to reflect said laser beam in said at least one scanning beam path to trace at least one scanning beam of a laser scan pattern; and

said arrangement further comprising means for timing the cyclical reciprocation of said first prism with the position of said dithering optical device as it moves through each scanning arc.

20. The arrangement of claim 19 wherein said means for timing comprises means for mechanically connecting said dithering optical device to said first prism to reciprocate said first prism in time with the motion of said dithering optical device as it moves through each scanning arc.

21. The arrangement of claim 18

wherein said means for altering the position of said optical component comprises means for cyclically reciprocating said first prism in and out of the path of said laser beam;

wherein said means for redirecting comprises;

a rotating optical device mounted for movement repetitively through a rotational cycle about a second axis and having a plurality of primary reflective elements oriented in angularly displaced relation from one to the next about said second axis, each of said primary reflective elements being adapted to receive and reflect a laser light beam from said at least one scanning beam path as said primary reflective elements move successively through a portion of each rotational cycle of said rotating optical device; and

means for rotating said rotating optical device about said second axis; and

wherein said arrangement further comprises means for timing the cyclical reciprocation of said first prism with the position of said rotating optical device as it moves through each rotational cycle.

22. The arrangement of claim 21 wherein said means for timing comprises:

a cam mounted on said rotating optical device and positioned for movement about said second axis; and

a cam follower adapted to follow said cam and attached to said first prism, said cam and said cam follower adapted to impart a reciprocating motion to said first prism as said rotating optical device moves through portions of each rotational cycle.

23. The arrangement of claim 21 further comprising means for redirecting said pointer beam, wherein said means for redirecting comprises one or more second prisms.

24. The arrangement of claim 1 wherein said means for multiplexing comprises electronic means for modifying one or more properties of said laser beam to alter the path of at least a portion of said laser beam.

25. The arrangement of claim 24 wherein said electronic means for modifying said laser beam comprises:

a voltage tuned phase shifter positioned to receive and transmit a laser beam and adapted to alternate the phase of light transmitted therethrough from unshifted to phase-shifted by applying voltage thereto;

a polarization sensitive mirror positioned to receive said laser beam transmitted through said phase shifter, and adapted to transmit unshifted light to at least one pointer beam path and to reflect phase-shifted light to at least one scanning beam path; and

means for operating said phase shifter comprising means for cyclically applying voltage to said phase shifter to successively alternate the phase of light in said laser beam transmitted therethrough.

26. The arrangement of claim 25 wherein:

said means for redirecting comprises means for scanning; and

said arrangement further comprises means for timing the operation of said phase shifter with the position of said means for scanning, said means for timing including means for generating a voltage control signal related to the position of said means for scanning.

27. The arrangement of claim 1 wherein said means for redirecting said laser beam from said at least one scanning beam path to produce a laser scan pattern comprises means for scanning.

28. The arrangement of claim 27 wherein said means for scanning comprises:

a dithering optical device mounted on a rotatable mount for movement through a scanning arc about a third axis, said dithering optical device adapted to receive and reflect said laser beam in said at least one scanning beam path; and

means for dithering said dithering optical device about a third axis to reflect said laser beam in said at least one scanning beam path to trace at least one scanning beam of a laser scan pattern.

29. The arrangement of claim 27 wherein said means for scanning comprises:

a rotating optical device mounted for movement repetitively through a rotational cycle about a second axis and having a plurality of primary reflective elements oriented in angularly displaced relation from one to the next about said second axis, each of said primary reflective elements being adapted to receive and reflect a laser light beam from said at least one scanning beam path as said primary reflective elements move successively through a portion of each rotational cycle of said optical device; and

means for rotating said rotating optical device about said second axis.

30. The arrangement of claim 29 further comprising one or more pluralities of secondary reflective elements, and in each of said pluralities, said secondary reflective elements thereof being disposed in positions relative to one another, said secondary reflective elements being adapted to receive the laser beam reflected from said primary reflective elements as said primary reflective elements move successively through a portion of each rotational cycle, and adapted to reflect the same to trace at least one scanning beam of the laser light beam scan pattern.

31. The arrangement of claim 29 further comprising means for timing the operation of said means for multiplexing with the position of said rotating optical device as it moves through each rotational cycle.

32. The arrangement of claim 31 wherein said means for timing comprises means for mechanically connecting said means for multiplexing to said rotating optical device.

33. The arrangement of claim 32 wherein said means for mechanically connecting comprises:

a cam mounted on said rotating optical device for movement through said second axis; and

p1 a cam follower attached to said means for multiplexing.

34. The arrangement of claim 27 wherein said means for redirecting said laser beam from said at least one scanning beam path to produce a laser beam scan pattern further comprises one or more routing mirrors adapted to receive said laser beam from said at least one scanning beam path and reflect said laser beam to said means for scanning.

35. The arrangement of claim 1 further comprising means for timing the operation of said means for multiplexing with the operation of said means for redirecting.

36. The arrangement of claim 35 wherein said means for timing comprises means for mechanically connecting said means for multiplexing to said means for redirecting.

37. The arrangement of claim 35 wherein:

said means for timing comprises means for generating a control signal related to the operation of said means for redirecting; and

said means for multiplexing is adapted to operate in response to said control signal.

38. The arrangement of claim 1 further comprising means for redirecting said pointer beam.

39. The arrangement of claim 38 wherein said means for redirecting said pointer beam comprise one or more pointer beam routing mirrors.

40. The arrangement of claim 38 wherein said means for redirecting said pointer beam comprises one or more second prisms.

41. In a laser scanner, an optical arrangement for multiplexing and redirecting a laser beam to simultaneously produce both a laser beam scan pattern and a pointer beam comprising:

means for multiplexing a laser beam between at least one pointer beam path producing a pointer beam and at least one scanning beam path producing at least one scanning beam of a laser scan pattern; and

means for redirecting said laser beam from said at least one pointing beam path to redirect said pointer beam.

42. A method for simultaneously producing a pointer beam and a scan pattern comprising:

providing a laser light beam;

multiplexing said laser light beam between at least one pointer beam path and at least one scanning beam path;

producing a pointer beam from said laser beam along said at least one pointer beam path;

redirecting said laser beam along said at least one scanning beam path to produce one or more scanning beams of a scan pattern.

43. The method of claim 42 wherein the step of redirecting said laser beam is performed in timed relation with the step of multiplexing said laser beam.

44. The method of claim 42 wherein the step of multiplexing comprises the step of transmitting said laser beam through an optical component to produce at least one pointer beam path and at least one scanning beam path.

45. The method of claim 44 wherein the step of transmitting comprises transmitting said laser beam through a refractive optical component.

46. The method of claim 44 wherein the step of transmitting comprises transmitting said laser beam through a refractive optical component.

47. The method of claim 44 wherein the step of transmitting comprises transmitting said laser beam through a rotating optical component.

48. The method of claim 44 wherein the step of transmitting comprises transmitting said laser beam through an optical component cyclically reciprocating in and out of the path of said laser beam.

49. The method of claim 44 wherein the step of transmitting comprises transmitting said laser beam through an optical component cyclically reciprocating in the path of said laser beam.

50. The method of claim 42 wherein the step of multiplexing comprises the step of transmitting said laser beam through electronic means for modifying one or more properties of said laser beam to produce at least one pointer beam path and at least one scanning beam path.

51. The method of claim 42 wherein the step of redirecting comprises the steps of:

directing said laser beam from said at least one scanning beam path to a means for scanning; and

reflecting said laser beam from said means for scanning to produce at least one scanning beam.

52. The method of claim 51 wherein said step of reflecting said laser beam from said means for scanning comprises reflecting said laser beam to one or more pluralities of secondary reflective elements.