Optical image reader having a replaceable optical array panel

• US 7,304,290 B2
• Filed: 08/27/2004
• Issued: 12/04/2007
• Est. Priority Date: 08/27/2004
• Status: Active Grant

• Current Assignee: Psion PLC (Motorola Solutions, Inc.)
• Original Assignee: Psion Teklogix Systems Incorporated
• Inventors: Zhang, Tao, Xie, Xinjun, Kricorissian, Gregg
• Primary Examiner(s): Epps; Georgia
• Assistant Examiner(s): Lee; Patrick J.
• Application Number:
  US10/927,694
• Publication Number:
  US 20060054779A1
• Time in Patent Office: 1,194 Days
• Field of Search: None
• US Class Current: 250/216
• CPC Class Codes: G02B 13/16 for use in conjunction with image converters or intensifiers , or for use with projectors, e.g. objectives for projection TV
• CPC Class Codes: G02B 27/09 Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for adapting the beam shape of a laser diode G02B19/0052; adapting the beam shape of an LED G02B19/0061; coupling into light guides using intermediate optical elements G02B6/4204; beam shaping specially adapted for lasers H01S3/005
• CPC Class Codes: G02B 7/00 Mountings, adjusting means, or light-tight connections, for optical elements

Abstract

The optical image reader is versatile since it can be assembled for use in a variety of reader applications, such as an ultra high definition reader, a high definition reader, a standard reader and an ultra long range reader. In addition to a housing enclosing an image sensor, an adjustable objective lens assembly for focusing an image of a target on the image sensor and a light source for illuminating and/or targeting the target, the reader includes a light shaping optical element array comprising optical elements assembled together as an integral unit and adapted to be fixed to the housing for shaping and directing light on the target. The optical elements are mounted on a panel, which is adapted to be fixed to the reader housing either permanently, or releasably to permit replacement of the panel on the housing. The method of assembling the image reader comprises the steps of selecting a light shaping optical element array from the variety of optical element arrays for the specific application, adjusting the objective lens assembly for optimum focal length for the specific application, and fixing the light shaping optical element array panel to the image reader housing. The present invention is further directed to a kit for an imaging system. The kit for an imaging system comprises an image reader mounted in a housing and one or more light shaping optical element array panels, each adapted to be releasably attached to the image reader housing.

Claims

1. In an image reader having a housing enclosing an image sensor, an adjustable objective lens assembly for focusing an image of a target onto the image sensor and a light source for illuminating and/or targeting the target, an optical element panel adapted to be fixed to the housing, the optical element panel comprising:

a light shaping optical element array of optical elements fixed on the panel as an integral unit for shaping and directing light onto the target; and

a securing element including;

a first aperture on the panel for receiving the objective lens assembly, the housing including a second aperture associated with the first aperture; and

a plurality of first fingers integrated into the panel and extending from the first aperture, the plurality of first fingers releasably engaged with a plurality of second fingers extending from the second aperture of the housing by a snap engagement for securing the position of the objective lens assembly in the housing when the optical element panel is fixed to the housing, wherein the position of the objective lens assembly in the housing may be changed when the plurality of first fingers are not engaged with the plurality of second fingers.

2. An optical element panel as claimed in claim 1 wherein the plurality of second fingers includes collet fingers, the collet fingers associating with the plurality of first fingers.

3. An optical element panel as claimed in claim 2 wherein the plurality of first fingers include tapered fingers that coincide with the collet fingers for securing the objective lens assembly.

4. An optical element panel as claimed in claim 1 wherein the optical elements in the optical element array are adapted to shape and direct light for illuminating the target.

5. An optical element panel as claimed in claim 1 wherein the optical elements in the optical element array are adapted to shape and direct light for targeting the target.

6. An optical element panel as claimed in claim 1 wherein the optical elements in the optical element array are adapted to shape and direct light for illuminating and targeting the target.

7. A light shaping optical element array panel as claimed in claim 1, wherein the optical element array is any one of a group of arrays that meet the requirements of an ultra high definition reader, a high definition reader, a standard reader and an ultra long range reader.

8. An optical element panel as claimed in claim 1, wherein the plurality of first fingers are configured to slide over the plurality of second fingers and compress the plurality of second fingers.

9. An optical element panel as claimed in claim 8, wherein each of the plurality of first fingers includes a tab extending from the corresponding first finger inwardly into the first aperture.

10. In an image reader having a housing enclosing an image sensor, an adjustable objective lens assembly for focusing an image of a target onto the image sensor, a light source for illuminating and/or targeting the target and an optical element panel adapted to be fixed to the housing, the optical element panel comprising a light shaping optical element array of optical elements fixed on the panel as an integral unit for shaping and directing light onto the target, a method of assembling the image reader comprising the steps of:

selecting an optical element panel comprising a securing element including a first aperture on the optical element panel for receiving the objective lens assembly and a plurality of first fingers integrated into the panel and extending from the first aperture for securing the objective lens assembly in the housing when the optical element panel is fixed to the housing;

adjusting the objective lens assembly for optimum focal length for the specific reader; and

releasably fixing the optical element panel to the image reader housing, including;

sliding the plurality of first fingers over a connector of the housing, the connector of the housing including a second aperture and a plurality of second fingers extending from the second aperture; and

engaging the plurality of the first fingers with the plurality of second fingers by a snap movement so that the plurality of first fingers compresses the plurality of second fingers, thereby securing the objective lens assembly in the housing.

11. A kit for an imaging system comprising:

an image reader mounted in a housing for imaging a target; and

a plurality of optical element panels, each of the optical element panels including;

a securing element having;

a first aperture on the optical element panel for receiving an objective lens assembly, and

a plurality of first fingers integrated into the panel and extending from the first aperture, the plurality of first fingers being releasably engaged with a plurality of second fingers extending from a second aperture of the housing by a snap engagement for securing the objective lens assembly in the housing when the optical element panel is fixed to the housing; and

a light shaping optical element array of optical elements fixed to the panel

as an integral unit for shaping and directing light onto the target,

each optical element panel being adapted to be releasably attached to the image reader housing.

12. A kit as claimed in claim 11 wherein the optical element panels are constructed to shape and direct light to illuminate the target.

13. A kit as claimed in claim 11 wherein the optical element panels are constructed to shape and direct light to target the target.

14. A kit as claimed in claim 11 wherein at least one of the optical element panels meets the requirements of an ultra high definition reader.

15. A kit as claimed in claim 11 wherein at least one of the optical element panels meets the requirements of a high definition reader.

16. A kit as claimed in claim 11 wherein at least one of the optical element panels meets the requirements of a standard reader.

17. A kit as claimed in claim 11 wherein at least one of the optical element panels include a panel that meets the requirements of an ultra long range reader.

18. A kit as claimed in claim 11 wherein the image reader comprises an image sensor, and a targeting and/or illumination light source.

19. A kit as claimed in claim 11, wherein the plurality of first fingers are configured to slide over the plurality of second fingers and compress the plurality of second fingers.

20. A kit as claimed in claim 19, wherein each of the plurality of first fingers includes a tab extending from the corresponding first finger inwardly into the first aperture.

21. An optical element panel for an image reader comprising:

a light shaping optical element array of optical elements for shaping and directing sources of light; and

a fixing element for assembling an objective lens assembly with the optical element array as an integral unit;

the fixing element including;

a first aperture on the panel for receiving the objective lens assembly; and

a plurality of first fingers integrated into the panel and extending from the first aperture, the plurality of first fingers being releasably engaged with a plurality of second fingers extending from a second aperture of a housing for the image reader by a snap engagement for fixing the optical element panel to the housing thereby securing the objective lens assembly at a predetermined position in the housing.

22. An optical element panel as claimed in claim 21, wherein the first snap element comprises a plurality of fingers for releasably engaging a plurality of fingers extended from a second aperture on the housing of the image reader.

23. An optical element panel as claimed in claim 21, wherein the image reader comprises an image sensor for detecting light from the objective lens assembly, wherein the predetermined position of the objective lens assembly provides an appropriate focal length for focusing light onto the image sensor based on an intended function of the image reader.

24. An optical element panel as claimed in claim 23, wherein the intended function of the image reader is one of an ultra high definition reader, a high definition reader, a standard reader and an ultra long range reader.

25. An optical element panel as claimed in claim 21, wherein the first snap element comprises a plurality of first fingers associated with a plurality of second fingers extending from a second aperture of the housing, the plurality of first fingers being configured to slide over the plurality of second fingers and compress the plurality of second fingers.

26. An optical element panel as claimed in claim 25, wherein each of the plurality of first fingers includes a tab extending from the corresponding first finger inwardly into the first aperture.

27. A housing for an image reader comprising:

a first aperture to accommodate a barrel of an objective lens assembly; and

a connector surrounding the first aperture for cooperating with an optical element panel, the optical element panel including a second aperture for receiving the barrel of the object lens assembly, the connector including;

a plurality of first fingers extending from the first aperture, the plurality of first fingers being releasably engaged with a plurality of second fingers extending from the second aperture of the optical element panel by a snap engagement to releasably secure the position of the objective lens assembly within the housing when the optical element panel is fixed to the housing.

28. The housing for an image reader as claimed in claim 27 further comprising means for accepting an image sensor for detecting light from the objective lens assembly.

29. The housing for an image reader as claimed in claim 28, wherein the position of the objective lens assembly provides an appropriate focal length with respect to the image sensor based on an intended function of the image reader.

30. The housing for an image reader as claimed in claim 29, wherein the intended function of the image reader is one of an ultra high definition reader, a high definition reader, a standard reader and an ultra long range reader.

31. The housing for an image reader as claimed in claim 27, wherein the plurality of first fingers comprise a plurality of collet fingers,

the plurality of second fingers cooperating with the plurality of collet fingers through the snap engagement.

32. A housing as claimed in claim 27, wherein the plurality of second fingers are configured to slide over the plurality of first fingers and compress the plurality of first fingers.

33. A kit as claimed in claim 32, wherein each of the plurality of second fingers includes a tab extending from the corresponding second finger inwardly into the second aperture.