Omnidirectional optical scanning apparatus

• US 3,947,816 A
• Filed: 07/01/1974
• Issued: 03/30/1976
• Est. Priority Date: 07/01/1974
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Rabedeau, Melbourne Edward
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US05/484,479
• Time in Patent Office: 638 Days
• Field of Search: 340/146.3 Z, 340/146.3 H, 340/146.3 F, 235/61.11 E, 178/7.6, 350/6, 350/7, 350/103, 350/99, 350/285, 250/568
• US Class Current: 235/462.4
• CPC Class Codes: G06K 7/10871 randomly oriented data-fields, code-marks therefore, e.g. concentric circles-code

Abstract

An omnidirectional optical system is arranged for scanning bar coded labels passing a rectangular scanning window with a plurality of interlaced scans in a plurality of differing directions whereby the labels are completely scanned irrespective of orientation. The interlaced and plural directive scanning rays are generated by directing a beam of light, from a laser or like light source, onto a rotating multi-faceted mirror for deflecting the light beam in a line extending in a given direction. A set of fixed mirrors is positioned to deflect the light beam in a number of laterally displaced scanning segments all parallel to the line extending in the given direction. A pair of fixed end mirrors are arranged for reflecting the light from half of the segments back onto the other half of the segments to provide the intersecting scanning pattern. Beam splitting mirrors are interposed in the light beam from the laser for providing additional light beams directed onto the rotating mirror to provide an interlaced raster.

Claims

1. Omnidirectional optical scanning apparatus for scanning bar coded labels, comprising

an elongated scanning window at which said labels are presented in random orientation,

optical means for generating a beam of light,

optical means arranged with respect to said generating means for deflecting said beam of light along a line in a given plane intersecting the plane of said scanning window at a predetermined angle to the longitundinal axis of said window,

optical means interposed between said deflecting means and said scanning window for dividing said deflected beam of light along said line into scanning segments and offsetting said segments with respect to each other intersecting the plane of said scanning window at the same predetermined angle for producing a multiple of scans across said scanning window, and

optical means intercepting a portion of said deflected light beam scanning segments and reflecting the intercepted scanning segments over to and intersecting the other scanning segments within said scanning window.

2. Omnidirectional optical scanning apparatus as defined in claim 1 and incorporating

optical means interposed between said light beam generating means and said optical deflecting means for splitting said beam into a plurality of like beams arranged at different angles for producing a multiple of interlaced scans across said scanning window.

3. Omnidirectional optical scanning apparatus as defined in claim 1 and wherein

said predetermined angle is one at which said scanning segments overlap one another within said scanning window.

4. Omnidirectional optical scanning apparatus for scanning bar coded labels comprising

an elongated scanning window at which said labels are presented in random orientation,

a light source providing a beam of light,

a multifaceted mirror arranged for continuous rotation,

said light source and said rotating mirror being arranged with respect to said scanning window in angular relationship at which said beam of light is deflected over a line lying at a predetermined angle to the longitudinal axis of said window is scanned by said beam of light, and

a multiple of fixed mirrors arranged along said line and interposed between said multifaceted mirror and said scanning window for dividing the deflected beam of light at said line and offsetting the divisional segments thereof into segments scanning consecutively across said window at said predetermined angle.

5. Omnidirectional optical scanning apparatus as defined in claim 4 and incorporating

an optical beam splitting mirror assembly interposed between said laser and said multifaceted mirror for producing a plurality of beams projected onto said mirror at different angles at which the scanning beams across said scanning window are interlaced.

6. Omnidirectional optical scanning apparatus as defined in claim 4 and wherein

two of said multiple mirrors are arranged at the ends of said window and depend thereform parallel to each other.

7. Omnidirectional optical scanning apparatus as defined in claim 6 and wherein

the remainder of said multiple mirrors are arranged on a line at the center thereof at an angle of substantially 45°

to the longitudinal axis of said scanning window, and

each mirror is also arranged at an angle with respect to the other mirrors on said line.

8. Omnidirectional optical scanning apparatus as defined in claim 7 and wherein

the mirrors of said remainder of multiple mirrors at the ends of said line are slightly convex for increasing the focal length.

9. Omnidirectional optical scanning apparatus as defined in claim 4 and incorporating

a photoresponsive device arranged for intercepting light from said scanning window as reflected by said label, and

electric signal translating circuitry coupled to said photoresponsive device for producing an electric signal indicative of the information borne by said label.

10. Omnidirectional optical scanning apparatus as defined in claim 4 and wherein

said scanning window is an elongated rectangle having an aspect ratio of 10:

1.

11. Omnidirectional optical scanning apparatus as defined in claim 10 and wherein

sixteen crossed scans appear in said scanning window.

12. Omnidirectional optical scanning apparatus as defined in claim 10 and wherein said scanning segment intersect at angles of 90°

within said scanning window.

13. Omnidirectional optical scanning apparatus as defined in claim 10 and wherein said scanning segment intersect at angles of 80°

within said scanning window.

14. Omnidirectional optical scanning apparatus for scanning bar coded labels comprising

an elongated scanning window at which said labels are presented in random orientation,

a light source providing a beam of light,

a multifaceted mirror arranged for continuous rotation,

said light source and said rotating mirror being arranged with respect to said scanning window in angular relationship at which said beam of light is deflected over a line lying at a predetermined angle to the longitudinal axis of said window is scanned by said beam of light, and

a multiple of fixed mirrors arranged along said line and interposed between said multifaceted mirror and said scanning window for dividing the deflected beam of light at said line and offsetting the divisional segments thereof into segments scanning consecutively across said window at a rate imparting the appearance to the eye of scanning substantially simultaneously across said window at said predetermined angle.