Hand-supportable planar linear illumination and imaging (PLIIM) based code symbol reading system

• US 7,527,202 B2
• Filed: 12/04/2006
• Issued: 05/05/2009
• Est. Priority Date: 06/07/2000
• Status: Expired due to Fees

• Current Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Original Assignee: Metrologic Instruments Incorporated (Honeywell International Inc.)
• Inventors: Zhu, Xiaoxun, Amundsen, Thomas, Naylor, Charles A., Knowles, Carl Harry, Jankevics, Andrew, Schnee, Michael D., Tsikos, Constantine J., Wirth, Allan, Dobbs, Russell Joseph
• Primary Examiner(s): Kim; Ahshik
• Application Number:
  US11/633,666
• Publication Number:
  US 20080029599A1
• Time in Patent Office: 883 Days
• Field of Search: 235/462.01, 235/462.09, 235/462.24, 235/462.42
• US Class Current: 235/462.01
• CPC Class Codes: B82Y 15/00 Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10732 Light sources
• CPC Class Codes: G06K 7/10811 Focalisation
• CPC Class Codes: H01S 5/02325 Mechanically integrated components on mount members or optical micro-benches
• CPC Class Codes: H01S 5/4025 Array arrangements, e.g. constituted by discrete laser diodes or laser bar H01S5/42 takes precedence

Abstract

A hand-supportable planar linear illumination and imaging (PLIIM) based code symbol reading system comprising: a hand-supportable housing having a light transmission aperture; and a planar laser illumination and imaging module (PLIIM), disposed in the hand-supportable housing. The PLIIM includes (i) a linear image detection array having optics providing a field of view (FOV) on said linear image detection array that projects through the light transmission aperture, and (ii) at least one planar laser illumination module (PLIM) for producing a substantially planar laser illumination beam (PLIB) that extends substantially along the same plane as the FOV of the linear image detection array. This arrangement provides a coplanar illumination and imaging plane that projects through the light transmission aperture, for capturing a series of linear (1-D) digital images of an object intersecting therewith during object illumination and imaging operations. An image frame grabber then accesses 1-D digital images therefrom and composes a 2-D digital image of the object. An image data buffer buffers 2-D images received from the image frame grabber, and a decode image processor processes the digital images stored within the image data buffer so as to read one or more code symbols graphically represented in the digital images. A system controller controls the operations within the system.

Claims

1. A hand-supportable planar linear illumination and imaging (PLIIM) based code symbol reading system comprising:

a hand-supportable housing having a light transmission aperture;

a planar laser illumination and imaging module (PLIIM), disposed in said hand-supportable housing, and including

(i) a linear image detection array having optics providing a field of view (FOV) projecting on said linear image detection array and through said light transmission aperture, and

(ii) at least one planar laser illumination module (PLIM) for producing a substantially planar laser illumination beam (PLIB) that extends substantially along the same plane as the FOV of said linear image detection array so as to provide a coplanar illumination and imaging plane that projects through said light transmission aperture, for capturing a series of linear (1-D) digital images of an object intersecting said coplanar illumination and imaging plane during illumination and imaging operations;

an image frame grabber, disposed in said hand-supportable housing, for accessing 1-D digital images from said linear image detection array and composing one or more 2-D digital images of the object during illumination and imaging operations;

an image data buffer, disposed in said hand-supportable housing, for buffering 2-D digital images received from said image frame grabber during illumination and imaging operations;

a decode image processor, disposed in said hand-supportable housing, for processing said 2-D digital images stored within said image data buffer so as to read one or more code symbols graphically represented in said 2-D digital images; and

a system controller, disposed in said hand-supportable housing, for controlling operations within said PLIIM-based code symbol reading system.

2. The hand-supportable PLIIM-based code symbol reading system of claim 1, wherein said PLIM comprises a visible laser diode (VLD), a focusing lens, and a cylindrical optical element arranged therewith to produce said PLIB.

3. The hand-supportable PLIIM-based code symbol reading system of claim 1, which further comprises a printed circuit board, mounted in said hand-supportable housing, for supporting electronic and electro-optical components to implement one or more of said subsystems selected from the group consisting of said PLIIM, said image frame grabber, said image data buffer, said decode image processor, and said system controller.

4. The hand-supportable PLIIM-based code symbol reading system of claim 1, which has a working range, and wherein said PLIB has substantially uniform power density characteristics over the entire spatial extent of said PLIB, over the working range of said PLIIM-based code symbol reading system.

5. The hand-supportable PLIIM-based code symbol reading system of claim 1, wherein said PLIB is focused so that the minimum beam width thereof occurs at a point or plane which is the maximum object distance at which said PLIIM is designed to acquire said 1D digital images.

6. The hand-supportable PLIIM-based code symbol reading system of claim 1, wherein said linear image detection array comprises an array of electronic image detection cells realized using charge-coupled device (CCD) technology.

7. The hand-supportable PLIIM-based code symbol reading system of claim 1, wherein said one or more code symbols comprise one or more bar code symbols selected from the group consisting of 1D bar code symbols, 2D bar code symbols and data matrix type bar code symbols.

8. The hand-supportable PLIIM-based code symbol reading system of claim 1, wherein said image data buffer comprises VRAM for buffering 2-D digital images received from said image frame grabber.