Long range optical reader

• US 7,055,747 B2
• Filed: 09/23/2002
• Issued: 06/06/2006
• Est. Priority Date: 06/11/2002
• Status: Expired due to Fees

• Current Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Original Assignee: Hand Held Products Incorporated (Honeywell International Inc.)
• Inventors: Izzo, John, Havens, William H., Hennick, Robert J., Robinson, Michael
• Primary Examiner(s): Kim, Ahshik
• Application Number:
  US10/252,484
• Publication Number:
  US 20030226895A1
• Time in Patent Office: 1,352 Days
• Field of Search: 235/462.01, 235/462.09, 235/462.22, 235/462.23, 235/462.25, 235/462.42, 235/462.43
• US Class Current: 235/462.22
• CPC Class Codes: G06K 7/10584 Source control
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10801 Multidistance reading
• CPC Class Codes: G06K 7/10861 sensing of data fields affixed to objects or articles, e.g. coded labels postal sorting B07C3/14, conveying articles B65G47/48
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence
• CPC Class Codes: H05K 1/18 Printed circuits structurally associated with non-printed electric components H05K1/0201, H05K1/023, H05K1/0243, and H05K1/16 take precedence
• CPC Class Codes: H05K 2201/09072 Hole or recess under component or special relationship between hole and component
• CPC Class Codes: H05K 2201/09463 Partial lands, i.e. lands or conductive rings not completely surrounding the hole landless plated-through hole or via H05K2201/09545
• CPC Class Codes: H05K 2201/0949 Pad close to a hole, not surrounding the hole if used for surface mounting H05K1/114
• CPC Class Codes: H05K 2201/09645 Patterning on via walls; Plural lands around one hole
• CPC Class Codes: H05K 2201/09809 Coaxial layout reduction of cross-talk, noise or interference by printed shielding conductors for shielding around a single via or around a group of vias H05K1/0222
• CPC Class Codes: H05K 2201/10121 Optical component, e.g. opto-electronic component
• CPC Class Codes: H05K 3/244 Finish plating of conductors, especially of copper conductors, e.g. for pads or lands selective plating methods H05K3/243; finish plating of conductors made by printing techniques H05K3/246; solder as finish H05K3/3457, e.g. by plating H05K3/3473

Abstract

An indicia decoding device can have an image sensor and a laser diode assembly configured to project laser light onto a substrate. When a trigger signal is received by the indicia decoding device, the device can calculate a delay and enable the laser diode assembly if a delay threshold is satisfied. The indicia decoding device, in one embodiment, can include a hand held housing and an imaging module carrying the image sensor.

Claims

1. An optical reader for reading a decodable indicia disposed on a substrate, said optical reader comprising:

an imaging assembly including an image sensor having a plurality of photodetectors, said imaging assembly further including optics focusing an image onto said image sensor, said image sensor being selected from the group consisting of a 1D image sensor and a 2D image sensor, said imaging assembly further having an imaging axis;

a hand held housing encapsulating said image sensor;

a manual trigger disposed proximate a periphery of said hand held housing;

a targeting system including at least one laser diode assembly, said targeting system being configured to direct laser light toward said substrate; and

a control circuit communicatively coupled to said imaging assembly, said manual trigger and said targeting system, said control circuit being configured so that in response to said manual trigger being actuated said control circuit (a) repetitively captures frames of image data and attempts to decode decodable indicia represented therein, (b) counts a delay, wherein said control circuit further in response to said manual trigger being actuated (c) maintains said laser diode assembly in an OFF state if said control circuit successfully decodes an indicia prior to a time at which said delay is equal to or exceeds a threshold delay, and (d) drives said laser diode assembly into an ON state if said delay becomes equal to or greater than said threshold delay prior to a time at which said control circuit successfully decodes a decodable indicia.

2. The optical reader of claim 1, wherein said threshold delay is predetermined.

3. The optical reader of claim 1, wherein said optical reader further includes at least one light emitting diode directing light toward said substrate.

4. The optical reader of claim 1, wherein said optical reader further includes at least one light emitting diode directing light toward said substrate, said at least one light emitting diode emitting light at a wavelength different from light emitted by said at least one laser diode assembly.

5. The optical reader of claim 1, wherein said image sensor is a 1D image sensor.

6. The optical reader of claim 2, wherein said image sensor is a 2D image sensor.

7. The optical reader of claim 1, wherein said control circuit counts said delay utilizing a real time clock.

8. The optical reader of claim 1, wherein said optical reader further includes an illumination LED, and wherein said control circuit drives said illumination LED into an OFF state if said delay becomes equal to or greater than said threshold delay prior to a time at which said control circuit successfully decodes said decodable indicia.

9. An optical reader comprising:

an imaging assembly having a plural photodetector image sensor and an imaging axis;

an illumination assembly comprising at least one illumination LED and at least one laser diode assembly, wherein said illumination assembly is adapted to project an aiming pattern onto a substrate; and

a control circuit in communication with said imaging assembly and said illumination assembly, wherein said reader has an operating mode in which said control circuit, in response to receipt of a trigger signal;

calculates a delay;

captures at least one frame of image data;

subjects said at least one frame of image data to an indicia decode attempt; and

enables said laser diode assembly to project said aiming pattern onto said substrate provided that said indicia decode attempt is not successful and said delay is equal to or greater than a threshold delay.

10. The reader of claim 9, wherein said control circuit subsequent to receipt of said trigger signal captures a plurality of frames of image data and subjects each of a plurality of said captured frames of image data to a decode attempt, and wherein said control circuit in response to a receipt of said trigger signal enables said laser diode assembly to project said visible laser light onto said substrate in said predetermined pattern provided that each of said plurality of decode attempts is not successful and said delay is greater than or equal to said threshold delay.

11. The reader of claim 9, wherein said plural photodetector image sensor is a 1D image sensor.

12. The reader of claim 9, wherein said plural photodetector image sensor is a 2D image sensor.

13. The reader of claim 9, wherein said LED projects light onto said substrate at a wavelength different than a wavelength of light emitted by said laser diode assembly.

14. The reader of claim 9, further including a prism for redirecting an optical path of a beam emitted by said laser diode assembly.

15. The reader of claim 9, wherein said imaging assembly includes a best focus distance of at least five feet.

16. The reader of claim 9, wherein said reader includes an optical assembly which splits a beam emitted by said laser diode assembly to project a plurality of spots on a target substrate, said spots being projected substantially along a horizontal centerline of a target.

17. The reader of claim 9, further including a hand held housing encapsulating said image sensor.

18. The reader of claim 9, wherein said reader includes an imaging module installed within said housing, said imaging module having a support assembly carrying said image sensor together with imaging optics.

19. The reader of claim 9, wherein said optical reader includes a fixed best focus position.

20. The reader of claim 9, wherein said illumination assembly includes a slit aperture and emit optics for imaging said slit aperture onto said substrate, wherein said emit optics are adapted so that said slit aperture is optimally focused onto said substrate at a reader distance greater than a best focus receive position of said reader.

21. The optical reader of claim 9, wherein said control circuit calculates said delay utilizing a clock.

22. The optical reader of claim 9, wherein said control circuit calculates said delay by monitoring an internal process of said reader.

23. The optical reader of claim 9, wherein control circuit further disables said illumination LED if said delay is equal to or greater than a threshold delay.

24. An indicia decoding device comprising:

an imaging assembly having a plural photodetector image sensor, an optics focusing target indicia onto said plural photodetector image sensor, and an imaging axis;

a hand held housing encapsulating said image sensor;

at least one laser diode assembly, wherein said laser diode assembly is adapted to project visible laser light onto a substrate in a predetermined pattern; and

a control circuit in communication with said imaging assembly and said illumination assembly, wherein said reader has an operating mode in which said control circuit, in response to receipt of a trigger signal;

calculates a delay;

captures at least one frame of image data;

subjects said at least one frame of image data to an indicia decode attempt; and

enables said laser diode assembly to project said visible laser light onto said substrate in said predetermined pattern provided that said decode attempt is not successful and a delay threshold has been satisfied, whereby enabling of said laser diode assembly is avoided if said control circuit successfully decodes a first frame of image data that is subject to a decode attempt subsequent to said receipt of said trigger signal.

25. The device of claim 24, wherein said control circuit subsequent to receipt of said trigger signal captures a plurality of frames of image data and subjects each of a plurality of said captured frames of image data to a decode attempt, and wherein said control circuit in response to a receipt of said trigger signal enables said laser diode assembly to project said visible laser light onto said substrate in said predetermined pattern provided that each of said plurality of decode attempts is not successful and said delay threshold has been satisfied.

26. The device of claim 24, wherein said image sensor, optics, and said laser diode assembly are commonly supported by a support assembly of an imaging module installed within said housing.

27. The device of claim 24, wherein said plural photodetector image sensor is a 1D image sensor.

28. The device of claim 24, wherein said plural photodetector image sensor is a 2D image sensor.

29. The device of claim 24, wherein said device further has an LED that projects light onto said substrate at a wavelength different than a wavelength of light emitted by said laser diode assembly.

30. The device of claim 24, further including a prism for redirecting an optical path of a beam emitted by said laser diode assembly.

31. The device of claim 24, wherein said imaging assembly includes a best focus distance of at least five feet.

32. The device of claim 24, wherein said reader includes an optical assembly which splits a beam emitted by said laser diode assembly to project a plurality of spots on a target substrate, said spots being projected substantially along a horizontal centerline of a target.

33. The device of claim 24, wherein said device further has an LED that projects light onto said substrate.

34. The device of claim 24, wherein said device includes a fixed best focus position.

35. The device of claim 24, wherein said device has an illumination assembly including a slit aperture and emit optics for imaging said slit aperture onto said substrate, wherein said emit optics are adapted so that said slit aperture is optimally focused onto said substrate at a reader distance greater than a best focus receive position of said reader.

36. The device of claim 24, wherein said control circuit calculates said delay utilizing a clock.

37. The device of claim 24, wherein said control circuit calculates said delay by monitoring an internal process of said reader.

38. The device of claim 33, wherein control circuit further disables said illumination LED if said delay is equal to or greater than a threshold delay.

39. An indicia decoding device capable of decoding decodable indicia disposed on a substrate, said indicia decoding device comprising:

an imaging assembly having a plural photodetector two dimensional image sensor, optics focusing target indicia onto said plural photodetector two dimensional image sensor, and an imaging axis;

a hand held housing encapsulating said plural photodetector two dimensional image sensor;

at least one laser diode assembly, wherein said laser diode assembly is adapted to project visible laser light onto said substrate in a predetermined pattern; and

a control circuit in communication with said imaging assembly and said illumination assembly, wherein said indicia decoding device has an operating mode in which said control circuit, in response to receipt of a trigger signal;

calculates a delay;

captures at least one frame of image data;

subjects said at least one frame of image data to an indicia decode attempt; and

enables said laser diode assembly to project said visible laser light onto said substrate in said predetermined pattern provided that said decode attempt is not successful and a delay threshold has been satisfied, whereby said laser diode assembly is enabled subsequent to receipt of a trigger signal only under difficult reading conditions.

40. The indicia decoding device of claim 39, wherein said control circuit in response to receipt of said trigger signal captures a plurality of frames of image data and subjects each of a plurality of said captured frames of image data to a decode attempt, and wherein said control circuit in response to a receipt of said trigger signal enables said laser diode assembly to project said visible laser light onto said substrate in said predetermined pattern provided that each of said plurality of decode attempts is not successful and said delay threshold has been satisfied.

41. The device of claim 39, wherein said device further includes an LED that projects light at a wavelength different than a wavelength of light emitted by said laser diode assembly.

42. The device of claim 39, further including a prism for redirecting an optical path of a beam emitted by said laser diode assembly.

43. The device of claim 39, wherein said imaging assembly includes a best focus distance of at least five feet.

44. The device of claim 39, wherein said reader includes an optical assembly which splits a beam emitted by said laser diode assembly to project a plurality of spots on a target substrate, said spots being projected substantially along a horizontal centerline of a target.

45. The reader of claim 39, wherein said device further has an LED that projects light onto said substrate.

46. The device of claim 39, wherein said optical reader includes a fixed best focus position.

47. The device of claim 39, wherein said illumination assembly includes a slit aperture and emit optics for imaging said slit aperture onto said substrate, wherein said emit optics are adapted so that said slit aperture is optimally focused onto said substrate at a reader distance greater than a best focus receive position of said reader.

48. The device of claim 39, wherein said control circuit calculates said delay utilizing a clock.

49. The device of claim 39, wherein said control circuit calculates said delay by monitoring an internal process of said reader.

50. The device of claim 45, wherein control circuit further disables said illumination LED if said delay is equal to or greater than a threshold delay.