Handheld code reader having a motion sensor

• US 8,469,276 B1
• Filed: 09/30/2010
• Issued: 06/25/2013
• Est. Priority Date: 12/21/2007
• Status: Active Grant

• Current Assignee: Cognex Corporation
• Original Assignee: Cognex Corporation
• Inventors: Nunnink, Laurens
• Primary Examiner(s): Lee, Michael G
• Assistant Examiner(s): CHEDEKEL, TABITHA F
• Application Number:
  US12/894,949
• Time in Patent Office: 999 Days
• Field of Search: 235/454, 235/462.23, 235/462.45, 235/472.01, 235/462.07, 235/462.09, 235/462.11, 235/462.24
• US Class Current: 235/462.23
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners

Abstract

A method and apparatus for use with a handheld code reader that has a plurality of operating characteristics where each operating characteristic can have a plurality of different states wherein a recipe includes a specific set of states of at least first and second characteristics, the method for switching between recipes and comprising the steps of specifying a circumstance set including at least one of reader orientation and a threshold movement level for the reader, monitoring at least one of movement and orientation of the reader, determining when the circumstance set occurs and changing from a current recipe to a next recipe when the circumstance set occurs.

Claims

1. A method for use with a handheld code reader that has a plurality of operating characteristics where each operating characteristic can have a plurality of different states wherein a recipe includes a specific set of states of at least first and second characteristics, the method for switching between recipes and comprising the steps of:

specifying a circumstance set including at least one of reader orientation and a threshold movement level for the reader;

monitoring at least one of movement and orientation of the reader;

determining when the circumstance set occurs a first time;

changing from a first recipe to a second recipe when the circumstance set occurs;

continuing to monitor for at least one of movement and orientation of the reader;

determining when the circumstance set occurs a second time;

changing from the second recipe to a third recipe when the circumstance set occurs a second time;

wherein the first recipe, the second recipe and the third recipe are different recipes.

2. The method of claim 1 wherein the plurality of operating characteristics include an illumination mode and a code decoding algorithm.

3. The method of claim 1 wherein the reader includes an indicator and wherein the indicator is activated whenever the recipe is modified.

4. The method of claim 3 wherein the indicator includes a light emitting diode.

5. The method of claim 1, wherein the circumstance set includes a threshold movement level of the reader and the handheld code reader includes a movement axis, the movement detected including movement with respect to the movement axis.

6. The method of claim 5 wherein the movement detected includes rotation substantially about the movement axis.

7. The method of claim 5 where the code reader includes an image obtaining component that has a field of view (FOV) centered on the movement axis and wherein the movement detected includes rotation substantially around the movement axis.

8. The method of claim 7 wherein the threshold movement level specifies rotation substantially around the movement axis through a threshold rotation angle.

9. The method of claim 8 wherein the threshold rotation angle is between 45 degrees and 180 degrees.

10. The method of claim 5 where the code reader includes an image obtaining component that has a field of view (FOV) centered on an FOV axis, the movement detected includes rotation substantially about the movement axis and the movement axis is substantially parallel to the FOV axis.

11. The method of claim 5 wherein the code reader movement is sensed by a motion sensor.

12. The method of claim 1 wherein the code reader includes a trigger member and the step of changing the current recipe includes changing the recipe when the trigger member is activated and the detected reader movement exceeds the threshold movement level.

13. A method for use with a handheld code reader to select at least one reader operating characteristic, the method comprising the steps of:

detecting a first movement of the handheld code reader;

determining, based on the first movement of the reader, a first optimum setting for the at least one reader operating characteristic;

setting the reader operating characteristic to the first optimum setting;

detecting a second movement of the handheld code reader;

determining, based on the second movement of the reader, a second optimum setting for the at least one reader operating characteristic;

setting the reader operating characteristic to the second optimum setting;

wherein the at least one operating characteristic includes at least one of lens focus and exposure time.

14. The method of claim 13 wherein the at least one reader operating characteristic is lens focus and wherein the optimum setting for the at least one operating characteristic includes lens focusing settings that are altered as the code reader is moved toward and away from a code to be read.

15. The method of claim 13 wherein the at least one reader operating characteristic is exposure time and wherein the optimum setting reduces the exposure time as the degree of movement increases.

16. The method of claim 13, wherein the sensing movement step further includes sensing the direction of movement of the reader.

17. The method of claim 16, further including the step of using the sensed direction of the reader movement to predict the direction in which the focus needs to be adjusted.

18. An apparatus for use with a handheld code reader that has a plurality of operating characteristics where each operating characteristic can have a plurality of different states wherein a recipe includes a specific set of states of at least first and second characteristics, the apparatus for switching between recipes and comprising:

a sensor for monitoring at least one of movement and orientation of the reader;

a processor for determining, based on at least one of movement and orientation of the reader, when the circumstance set occurs a first time;

a characteristic controller for changing from a first recipe to a second recipe when the circumstance set occurs the first time;

the processor determining, based on at least one of movement and orientation of the reader, when the circumstance set occurs a second time; and

the characteristic controller changing from the first recipe to a second recipe when the circumstance set occurs the second time.

19. The apparatus of claim 18 wherein the plurality of operating characteristics include an illumination mode and a code decoding algorithm.

20. The apparatus of claim 18 wherein the reader includes an indicator and wherein the indicator is activated whenever the recipe is modified.

21. The apparatus of claim 18, wherein the circumstance set includes a threshold movement level of the reader and the handheld code reader includes a movement axis, the movement detected including movement with respect to the movement axis.

22. An apparatus for use with a handheld code reader to select at least one reader operating characteristic, the apparatus comprising:

a sensor for detecting a first movement of the handheld code reader;

a processor for determining, based on the first movement of the reader, a first optimum setting for the at least one reader operating characteristic; and

a characteristic controller for selecting the first optimum settings for the code reader as a function of the reader movement;

the sensor for detecting a second movement of the handheld code reader;

the processor for determining, based on the second movement of the reader, a second optimum setting for the at least one reader operating characteristic; and

the characteristic controller for selecting the second optimum setting for the code reader as a function of the reader movement;

wherein the at least one operating characteristic includes at least one of lens focus and exposure time.

23. The apparatus of claim 22 wherein the at least one reader operating characteristic is exposure time and wherein the optimum setting reduces the exposure time as the degree of movement increases.

24. The apparatus of claim 22, wherein the sensor further senses the direction of movement of the reader and the processor determines the optimum setting as a function of the direction in which the reader is moving.

25. The apparatus of claim 24, further including the step of using the sensed direction of the reader movement to predict the direction in which lens focus is to be adjusted.

26. A method for use with a handheld code reader that has a plurality of operating characteristics where each operating characteristic can have a plurality of different stated wherein a recipe includes a specific set of states of at least first and second characteristics, the method for switching between recipes and comprising the steps of:

specifying a circumstance set including at least one of reader orientation and a threshold movement level for the reader;

with the reader held in the hand of a user, aligning the reader with a code;

attempting to read the code using the reader;

after attempting to read the code using the reader and while the reader remains in the hand of the user, monitoring at least one of movement and orientation of the reader;

determining when the circumstance set occurs; and

changing from a current recipe to a next recipe when the circumstance set occurs.