Portable, stand-alone, desk-top laser scanning workstation for intelligent data acquisition terminal and method of scanning

• US 4,369,361 A
• Filed: 03/25/1980
• Issued: 01/18/1983
• Est. Priority Date: 03/25/1980
• Status: Expired due to Term

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Barkan, Edward, Swartz, Jerome, Adelson, Alexander M., Harrison, Shelley A., Bravman, Richard, Delfine, Frank
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US06/133,945
• Time in Patent Office: 1,029 Days
• Field of Search: 235/470, 235/454, 235/462, 235/463, 235/467, 350/241, 350/243, 340/146.3 SY, 340/146.3 F, 350/6.7, 350/6.8
• US Class Current: 235/470
• CPC Class Codes: G06K 7/10871 randomly oriented data-fields, code-marks therefore, e.g. concentric circles-code

Abstract

A portable, stand-alone, desk-top, laser scanning workstation includes a laser scanning head mounted above a support base. Objects bearing bar code symbols to be scanned are passed underneath the head for overhead scanning, or are passed along one side of the head for sideward scanning. The symbols are oriented face-up towards the handler all during their passage through the workstation to facilitate sighting and registration of the symbol with the laser light beam generated by the head. The workstation is self-supporting, is fully portable, can process objects of different sizes, and grants access to objects from either side of the workstation. The workstation is connected to a microprocessor-based microcomputer which is mounted within a desk-top console, as well as to a variety of peripheral devices such as a printer, a keyboard, a communications port, audio-visual annunciators and a data display. The workstation, console and peripheral devices all constitute an intelligent laser-based data acquisition terminal for use in a variety of applications.

Claims

1. In a laser scanning system, a portable, stand-alone, desk-top, laser scanning workstation for reading bar code symbols on objects passing through the workstation, comprising:

(a) a single housing having wall portions bounding an outlet port;

(b) miniature light source means mounted within the housing, for generating a laser light beam;

(c) miniature optic means mounted within the housing, for directing the laser light beam along a light path through the outlet port and towards a bar code symbol which is located in the vicinity of a reference plane that is located exteriorly of the housing;

(d) miniature scanning means mounted in the light path and within the housing, for cyclically sweeping the laser light beam across the bar code symbol for reflection therefrom;

(e) miniature sensor means mounted within the housing, for detecting the intensity of light reflected from the bar code symbol, and for generating an electrical signal indicative of the detected intensity of the reflected light;

(f) miniature signal processing means mounted within the housing, for processing the electrical signal to generate therefrom a processed signal descriptive of the bar code symbol;

(g) all of said miniature light source means, optic means, scanning means, sensor means, and signal processing means together with said housing constituting a light-weight, compact laser scanning head;

(h) a base located exteriorly of the housing and mountable on a support surface; and

(i) means for mounting the head on the base to constitute a laser scanning workstation which supports itself on the support surface and which is portable as a unit from one location to another, said head being mounted at a predetermined elevation above the base to permit the user to view the bar code symbol from above the same, and to position the bar code symbol in the light path of the laser light beam exteriorly of the outlet port during passage of the object through the workstation.

2. The desk-top laser scanning workstation of claim 1, wherein one of the housing wall portions is a bottom wall portion which is juxtaposed with and faces the base;

and wherein said oulet port is formed in the bottom wall portion and directs the exiting laser light beam generally downwardly towards the base, for overhead reading of the bar code symbols.

3. The desk-top laser scanning workstation of claim 2, wherein another of the housing wall portions bounds a viewport located between the viewer and the outlet port;

and further comprising means for covering the viewport and the outlet port, said covering means being transparent to permit overhead viewing of the bar code symbol to be scanned along a line of sight which extends from the viewer, through the viewport, and thereupon through the outlet port, and then to the bar code symbol.

4. The desk-top laser scanning workstation of claim 3, wherein said covering means is a scratch-resistant shield free of sharp edges to protect soft-packaged objects during their passage through the workstation.

5. The desk-top laser scanning workstation of claim 1, wherein said base is a substantially planar base plate in engagement with the support surface;

and wherein said head-mounting means includes a base flange mounted on the base plate, a head flange mounted on the head, and an upright part intermediate the flanges.

6. The desk-top laser scanning workstation of claim 1, wherein said head-mounting means mounts the head for movement relative to the base between a first scanning position in which the outlet port faces towards the base and directs the exiting laser light beam generally downwardly towards the base for overhead reading of the bar code symbols, and a second scanning position in which the outlet port faces laterally away from the base and directs the exiting laser light beam generally parallel to the base for sideward reading of the bar code symbols.

7. The desk-top laser scanning workstation of claim 6;

and further comprising means for locking the head in either one of said scanning positions.

8. The desk-top laser scanning workstation of claim 1, wherein said sensor means generates an electrical analog signal indicative of the detected intensity of the reflected light;

and wherein said signal processing means includes analog-to-digital processing means for converting the analog signal to a digital processed signal; and

wherein said system further comprises a desk-top console having processor means mounted therein and electrically connected to said signal processing means, for converting the digital processed signal to data descriptive of the scanned bar code symbol.

9. The desk-top laser scanning workstation of claim 8;

and further comprising data recorder means mounted on the console and electrically connected to said processor means, for recording the data descriptive of the bar code symbol.

10. The desk-top laser scanning workstation of claim 8;

and further comprising a host computer electrically connected to said processor means for establishing two-way electrical communication between the host computer and the processor means.

11. The desk-top laser scanning workstation of claim 1, wherein said head is spaced from the base, and wherein said reference plane is located underneath the head but above the base, and wherein the head bounds with the base a workspace through which objects may freely pass above the base without mechanical interference.

12. The desk-top laser scanning workstation of claim 1, wherein said scanning means generates a multiple line scan pattern which is cyclically swept along respective directions that are generally parallel and orthogonal to the direction of passage of the objects through the workstation.

13. The desk-top laser scanning workstation of claim 12, wherein said scanning means includes a single scan element for generating the multiple line scan pattern.

14. The desk-top laser scanning workstation of claim 13, wherein said scan element has an axis of rotation, and has a plurality of light-reflecting surfaces lying in planes which form different angles of inclination relative to the axis of rotation.

15. The desk-top laser scanning workstation of claim 1, wherein said base has a work surface for supporting the objects during their passage through the workstation;

and wherein said outlet port faces the work surface and directs the exiting laser light beam generally downwardly towards the work surface, for overhead reading of the bar code symbols.

16. The desk-top laser scanning workstation of claim 15, wherein said head bounds a workspace with said work surface of the base, and wherein the objects are freely passed without mechanical interference through the workspace with their bar code symbols facing upwardly towards the outlet port for direct impingement with the exiting laser light beam.

17. The desk-top laser scanning workstation of claim 15;

and further comprising means on the work surface of the base, for supportably guiding the objects during their passage through the workstation.

18. The desk-top laser scanning workstation of claim 15;

and further comprising means on the work surface of the base, for positioning the bar code symbols of differently-sized objects in the vicinity of the reference plane.

19. The desk-top laser scanning workstation of claim 18, wherein said positioning means includes a stepped guide member having a lower object-supporting surface elevated a given distance above the base, and at least one upper object-supporting surface elevated above the base at a greater distance than said given distance.

20. The desk-top laser scanning workstation of claim 19, wherein the objects include a substantially planar phonograph record album, a parallelepiped-shaped tape casssette and a larger parallelepiped-shaped tape cartridge;

and wherein each of these differently-shaped objects is supportably guided on different surfaces of the stepped guide member.

21. The desk-top laser scanning workstation of claim 1, wherein access to the outlet port on the housing is available from either side of the workstation;

and further comprising bi-directional object sensing means at the workstation for determining entry of an object to be scanned into the workstation from either side thereof.

22. The desk-top laser scanning workstation of claim 21, wherein said bi-directional object sensing means includes two pairs of object sensors each pair comprising a light transmitter and a light receiver, said object sensor pairs being spaced apart at a distance less than the size of the object, as considered along the direction of passage of the objects through the workstation.

23. The desk-top laser scanning workstation of claim 22, wherein said bi-directional object sensing means includes means for generating a control signal whenever either object sensor pair detects entry of an object into the workstation.

24. The desk-top laser scanning workstation of claim 1;

and further comprising decode indicator means at the workstation for indicating when an object has been successfully decoded.

25. The desk-top laser scanning workstation of claim 1;

and further comprising error indicator means at the workstation for indicating that an error has occurred.

26. The desk-top laser scanning workstation of claim 1;

and further comprising action indicator means at the workstation for indicating to the user the disposition to be taken for the just-scanned object.

27. The desk-top laser scanning workstation of claim 26, wherein the object to be scanned is a magazine or the like, and wherein the action indicator means comprises destroy indicator means for destroying the magazine, hold indicator means for storing the magazine, and strip indicator means for stripping the magazine cover off the magazine.

28. The desk-top laser scanning workstation of claim 1;

and further comprising manual data entry means operatively connected to the workstation, for manually entering auxiliary data into the system.

29. The desk-top laser scanning workstation of claim 28;

and further comprising data display means operatively connected to the workstation, for visually displaying the data.

30. The desk-top laser scanning workstation of claim 1, wherein said scanning means generates a bi-orthogonal scan pattern.

31. The desk-top laser scanning workstation of claim 30, wherein said bi-orthogonal scan pattern has two scanning sections which together assume a generally L-shaped configuration.

32. The desk-top laser scanning workstation of claim 31, wherein said scanning means includes means for sweeping the laser light beam along a scanning path to generate the first scanning section of the bi-orthogonal scan pattern;

and means in a portion of the scanning path which is unused for generating the first scanning section, for reflecting the laser light beam in the unused path portion through the outlet port to generate the second scanning section of the bi-orthogonal scan pattern.

33. The desk-top laser scanning workstation of claim 32, wherein said scanning means includes a single scan element for generating both scanning sections of the bi-orthogonal scan pattern, and wherein said reflecting means includes a mirror mounted on the housing in a skew manner relative to the base.

34. The desk-top laser scanning workstation of claim 32, wherein said scanning means includes a single scan element for generating both scanning sections of the bi-orthogonal scan pattern, said scan element being rotatable about an axis of rotation and having a plurality of light-reflecting surfaces lying in planes which form different angles of inclination relative to the axis of rotation, to thereby generate multiple scan lines for each scanning section.

35. The desk-top laser scanning workstation of claim 1;

and further comprising laser safeguard means for detecting malfunction of said scanning means, and for preventing generation of the laser light beam upon detection of such malfunction.

36. The desk-top laser scanning workstation of claim 35, wherein said scanning means includes a drive motor having windings across which a self-generated voltage is established;

and wherein said laser safeguard means detects changes in the self-generated voltage and thereupon disables the light source means from its power source.

37. A method of reading bar code symbols on objects to be scanned, comprising the steps of:

(a) generating a laser light beam in a scanning head having a discharge port;

(b) emitting the laser beam through the discharge port;

(c) scanning the emitted laser beam across the symbols for reflection therefrom;

(d) generating electrical signals indicative of the symbols being scanned in response to detection of the reflected light beam;

(e) processing the electrical signals to data descriptive of the symbols being scanned;

(f) mounting a base remotely from the head on a support surface;

(g) mounting the head at a predetermined elevation above the base to thereby constitute a stand-alone, desk-top, laser scanning workstation;

(h) orienting the objects to have their bar code symbols face away from the base and towards a handler;

(i) passing the oriented objects through the workstation; and

(j) registering the bar code symbols with the emitted laser beam during passage of the objects through the workstation.

38. The method as defined in claim 37, wherein said steps of orienting and passing the objects are performed manually, and wherein said registering step is performed by visually aligning the symbols with the laser light beam.

39. The method as defined in claim 37, wherein said head-mounting step mounts the head to direct the laser light beam generally downwardly towards the base, and wherein said passing step is performed by passing the oriented objects underneath the laser scanning head, for overhead reading of the bar code symbols.

40. The method as defined in claim 37, wherein said head-mounting step mounts the head for movement between a first scanning position in which the laser light beam is directed generally downwardly towards the base for overhead reading of the bar code symbols, and a second scanning position in which the laser light beam is directed generally parallel to the base for sideward reading of the bar code symbols.

41. The method as defined in claim 40;

and further comprising the step of locking the head in either one of said scanning positions.

42. The method as defined in claim 37;

and further comprising the step of positioning the bar code symbols of differently-sized objects at the same general location exteriorly of the laser scanning head.

43. The method as defined in claim 37;

and further comprising the step of determining entry of an object to be scanned into the workstation in either direction of passage of the object through the workstation.

44. The method as defined in claim 37;

and further comprising the step of indicating to a user when an object has been successfully decoded.

45. The method as defined in claim 37;

and further comprising the step of indicating to a user that an error has occurred.

46. The method as defined in claim 37;

and further comprising the step of indicating to a user the disposition to be taken for the just-scanned object.

47. The method as defined in claim 37;

and further comprising the step of generating a bi-orthogonal scan pattern.

48. The method as defined in claim 47, when said pattern-generating step is performed by sweeping the laser light beam along a scanning path to generate a first scanning section of the bi-orthogonal scan pattern, and intercepting the laser light beam in a portion of the scanning path which is unused for generating the first scanning section, and concomitantly reflecting the laser light beam in the unused path portion to generate a second scanning section for the bi-orthogonal scan pattern.

49. The method as defined in claim 48, wherein said sweeping step is performed by using a single scan element, and wherein said reflecting step is performed by using a single light-reflecting element.

50. The method as defined in claim 49, wherein said sweeping step is performed by rotating the single scan element about an axis of rotation;

and further comprising the step of generating multiple scan lines for each scanning section of the bi-orthogonal scan pattern by positioning light-reflecting surfaces in planes which form different angles of inclination relative to the axis of rotation.

51. The method as defined in claim 37 and further comprising the step of generating a multiple line scan pattern by using a single scan element.

52. A miniature scan element for generating a multiple line scan pattern, comprising:

(a) a rotary hub portion having an axis of rotation;

(b) a plurality of radially-extending extension portions of one-piece with the hub portion, each extension portion having a light-reflecting mounting portion and a hinge portion integrally connected between the hub portion and its associated light-reflecting mounting portion;

(c) a plurality of light-reflecting means each provided on a respective light-reflecting mounting portion for joint rotation with the hub portion, said light-reflecting means being spaced circumferentially about the axis of rotation, and lying in planes which form different angles of inclination relative to the axis of rotation, to thereby reflect a multiple line scan pattern when a light beam is directed towards the rotating light-reflecting means; and

(d) adjusting means for setting the positions of the light-reflecting means at said different angles of inclination, each hinge portion having a thickness dimension which is thick enough to resist centrifugal forces developed during rotation of the hub portion, but thin enough to resiliently yield during adjustment of the positions of the light-reflecting means.

53. The miniature scan element of claim 52, wherein said adjusting means is continuously adjustable.

54. The miniature scan element of claim 52, wherein each light-reflecting means includes a mirror mounted on its associated light-reflecting mounting portion.

55. The miniature scan element of claim 54, wherein said adjusting means bears against and moves each light-reflecting mounting portion in radially outward direction.

56. The miniature scan element of claim 55, wherein said adjusting means includes a plurality of threaded elements mounted in tapped holes extending through the hub portion at an angle of inclination relative to the axis of rotation.

57. A method of making a miniature scan element for generating multiple line scan patterns, comprising the steps of:

(a) forming a one-piece construction including a rotary hub portion having an axis of rotation, and a plurality of radially-extending extension portions, each extension portion having a light-reflecting mounting portion and a hinge portion integrally connected between the hub portion and its associated light-reflecting mounting portion;

(b) providing a plurality of light-reflecting means each on a respectively light-reflecting mounting portion, and spacing the light-reflecting means circumferentially about the axis of rotation;

(c) adjusting the positions of the light-reflecting means to lie in planes which form different angles of inclination relative to the axis of rotation; and

(d) forming each hinge portion with a thickness dimension which is thick enough to resist centrifugal forces developed during rotation of the hub portion, but thin enough to resiliently yield during adjustment of the positions of the light-reflecting means.

58. A method of generating a multiple line scan pattern, comprising the steps of:

(a) forming a one-piece scan element of a rotary hub portion having an axis of rotation, and a plurality of radially-extending extension portions each having a light-reflecting mounting portion and a hinge portion integrally connected between the hub portion and its associated light-reflecting mounting portion;

(b) mounting a plurality of light-reflecting means each on a respective light-reflecting mounting portion, and spacing the light-reflecting means circumferentially about the axis of rotation;

(c) adjusting the positions of the light-reflecting means to lie in planes which form different angles of inclination relative to the axis of rotation, each hinge portion being thin enough to resiliently yield during adjustment of the positions of the light-reflecting means;

(d) rotating about the axis of rotation the one-piece scan element, each hinge portion being thick enough to resist centrifugal forces developed during rotation; and

(e) directing a light beam at the light-reflecting means for reflection therefrom, and thereby sweeping the reflected light beam along a scanning path to generate a scan line for each light-reflecting means.