Coplanar camera scanning system

• US 6,628,445 B2
• Filed: 03/16/2001
• Issued: 09/30/2003
• Est. Priority Date: 03/17/2000
• Status: Expired due to Term

• Current Assignee: Datalogic Automation Incorporated (Datalogic S.p.A.)
• Original Assignee: Accu-Sort Systems Incorporated (Datalogic S.p.A.)
• Inventors: Chaleff, Edward I., Brobst, Thomas J.
• Primary Examiner(s): Phan, James
• Application Number:
  US09/810,204
• Publication Number:
  US 20010035489A1
• Time in Patent Office: 928 Days
• Field of Search: 359/209, 359/210, 359/822-823, 359/204, 250/201.2, 250/227.2, 250/227.26, 250/234, 235/462.32, 235/462.41, 235/462.42, 235/454
• US Class Current: 359/210.1
• CPC Class Codes: G06K 7/10722 Photodetector array or CCD scanning
• CPC Class Codes: G06K 7/10732 Light sources
• CPC Class Codes: G06V 10/145 Illumination specially adapted for pattern recognition, e.g. using gratings
• CPC Class Codes: H04N 1/02815 Means for illuminating the original, not specific to a particular type of pick-up head
• CPC Class Codes: H04N 1/02865 using an array of light sources or a combination of such arrays, e.g. an LED bar
• CPC Class Codes: H04N 1/03 with photodetectors arranged in a substantially linear array

Abstract

A system for scanning objects having a linear array sensor, adapted to detect light input signals, is provided. A lens is optically connected to the linear array sensor, and is adapted to receive and transmit an optical image located in a field of view along a lens axis to the linear array sensor. A light source is used to generate an illumination stripe. A cylindrical lens is positioned between the light source and an object to be scanned. The cylindrical lens is adapted to collect, transmit and focus light from the light source to form the illumination stripe. The linear array sensor, lens axis, and illumination stripe are co-planar and parallel.

Claims

1. A system for scanning objects comprising:

a linear array sensor, adapted to detect light input signals;

a lens optically connected to the linear array sensor, the lens adapted to receive and transmit an optical image, located in a field of view along a lens axis, to the linear array sensor;

a light source; and

a cylindrical lens positioned between the light source and an object to be scanned, the cylindrical lens adapted to collect, transmit and focus light from the light source to form an illumination stripe;

wherein said linear array sensor, lens axis, and illumination stripe are co-planar and parallel.

2. The system for scanning objects of claim 1, wherein the cylindrical lens is a Fresnel lens.

3. The system for scanning objects of claim 1, wherein the linear array sensor is a CCD image sensor.

4. The system for scanning objects of claim 1, wherein the cylindrical lens has a center slit.

5. The system for scanning objects of claim 1, wherein the light source is an LED array.

6. The system for scanning objects of claim 5, wherein the LED array comprises very high intensity red LEDs.

7. The system for scanning objects of claim 1, wherein the light source is a semiconductor laser array.

8. The system for scanning objects of claim 1, wherein the light source is co-planar and parallel to said linear array sensor, lens axis and illumination stripe.

9. A system for scanning objects, comprising:

a linear array sensor, adapted to detect light input signals;

a lens optically connected to the linear array sensor, the lens adapted to receive and transmit an optical image, located in a field of view along a lens axis, to the linear array sensor;

a light source;

a cylindrical lens positioned between the light source and an object to be scanned, the cylindrical lens adapted to collect, transmit and focus light from the light source to form an illumination stripe;

a focusing device connected to the lens;

an actuator connected to the focusing device; and

a range finder connected to the actuator, the range finder adapted to determine a target object distance from the lens and to generate and transmit target object positioning data to the actuator.

10. The system for scanning objects of claim 9, wherein the light source includes multiple linear rows of light emitters.

11. The system for scanning objects of claim 10, further comprising:

a controller connected to the light source, the controller adapted to energize and de-energize selected linear rows of the light emitters.

12. The system for scanning objects of claim 9, wherein the light source is coplanar with the linear sensor array and the lens axis.

13. The system for scanning objects of claim 9, wherein the light source includes multiple linear rows of light emitters.

14. The system for scanning objects of claim 9, further comprising:

a controller connected to the light source, the controller adapted to energize and de-energize selected linear rows of light emitters.

15. The system for scanning objects of claim 9, wherein the cylindrical lens is a Fresnel lens.

16. The system for scanning objects of claim 9, wherein the linear array sensor is a CCD image sensor.

17. The system for scanning objects of claim 9, wherein the cylindrical lens has a center slit.

18. The system for scanning objects of claim 9, wherein the light source is an LED array.

19. The system for scanning objects of claim 9, wherein the light source is a semiconductor laser array.

20. The system for scanning objects of claim 9, wherein the light source is coplanar with the linear sensor array and the lens axis.