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

• US 6,390,370 B1
• Filed: 04/06/1999
• Issued: 05/21/2002
• Est. Priority Date: 11/15/1990
• Status: Expired due to Fees

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Plesko, George A.
• Primary Examiner(s): Lee, Michael G.
• Assistant Examiner(s): FRANKLIN, JAMARA ALZAIDA
• Application Number:
  US09/287,487
• Time in Patent Office: 1,141 Days
• Field of Search: 235/462.45, 235/462.49, 235/472.01, 235/472.02, 235/472.03, 235/462.46, 235/454
• US Class Current: 235/462.49
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• 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 3/0087 with index gradient
• CPC Class Codes: G02B 5/001 Axicons, waxicons, reflaxicons
• 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 33/16 : 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

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 it to emerge from its opposite end as a scanned beam, propagating in the same general forward direction it 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. Communication from the device is achievable by a cable or by wireless means.

Claims

1. A light beam scanner producing a light beam and directing said light beam along an optical path toward a target comprising a light source producing a source light beam and a scan element receiving said source light beam and redirecting said source light beam to provide a scanning light beam directed toward a target, said scan element including:

a generally planar flexible uni-member;

an optical element secured to said flexible member;

a support coupled to and supporting said flexible member, so that said optical element is disposed in said optical path, said support being coupled to said flexible member at a plurality of locations so as to permit flexing of said flexible member between said locations; and

means for flexing said flexible member, whereby flexing of said flexible member moves said optical element, thereby redirecting said optical path to provide a scanning light beam.

2. A light beam scanner according to claim 1, wherein said optical element is a mirror.

3. A light beam scanner according to claim 1, wherein said light source produces a light beam directed along a source axis, and said scan element redirects said source light beam to provide a scanning beam about a scanning beam axis which is generally parallel to said source axis.

4. A light beam scanner according to claim 1, wherein said scan element includes a pair of mirror disposed in said optical path, one of said mirrors comprising said optical element.

5. A light beam scanner according to claim 4, wherein said mirrors are disposed generally parallel to each other.

6. A light beam scanner according to claim 4, wherein the other of said mirrors is secured to said support.

7. A light beam scanner according to claim 1, 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.

8. A light beam scanner according to claim 7, wherein said arms have a generally serpentine shape.

9. A light beam scanner according to claim 7, wherein said arms have a generally spiral shape.

10. A light beam scanner according to claim 1, wherein said flexing means includes an electromagnetic motor.

11. A light beam scanner according to claim 10, wherein said electromagnetic motor includes a coil coupled to said support and a magnet coupled to said flexible member.

12. A light beam scanner according to claim 7, wherein said flexing means includes a piezoelectric bender coupled to said flexible member.

13. A scan apparatus comprising:

a light source producing a source light beam directed along an axis; and

an axial scan element disposed along said axis, said scan element receiving and redirecting said source light beam to provide a scanning light beam, directed generally along said axis, said scan element including a first mirror, a second mirror, and a gyrator, said first mirror being disposed along said axis to reflect said source light beam as a first reflected beam directed toward said second mirror, said second mirror being disposed so as to receive and reflect said first reflected beam to provide said scanning light beam, said gyrator being coupled to one of said mirrors and disposed to impart to the coupled mirror a gyrating motion about said axis.

14. A scan apparatus according to claim 13, wherein said gyrator imparts to the coupled mirror a gyrating motion in a first direction which is generally perpendicular to said axis.

15. A scan apparatus according to claim 13, wherein said gyrator imparts to the coupled mirror a gyrating motion having components in first and second directions which are generally perpendicular to each other and to said axis.

16. A scan apparatus according to claim 13, wherein said first mirror is coupled to said gyrator.

17. A scan apparatus according to claim 13, wherein said second mirror is coupled to said gyrator.

18. A scan apparatus according to claim 13, further including a generally cylindrical housing, having an axis of cylindrical symmetry, said light source and said scan element being disposed in said housing so that said axis is generally parallel to said axis of cylindrical symmetry.

19. A scan apparatus according to claim 13, further including a non-imaging light concentrator having a light receiving axis about which received light is collected and concentrated, said light concentrator being deposed so that said light receiving axis is generally parallel to said axis.

20. A scan apparatus according to claim 19, wherein said light concentrator is disposed generally coaxially with said axis.

21. A scan apparatus according to claim 19, wherein said light concentrator is a compound parabolic concentrator.