High speed imaging apparatus for CCD based scanners

• US 5,814,802 A
• Filed: 02/23/1996
• Issued: 09/29/1998
• Est. Priority Date: 02/23/1996
• Status: Expired

• Current Assignee: Accu-Sort Systems Incorporated (Datalogic S.p.A.)
• Original Assignee: Accu-Sort Systems Incorporated (Datalogic S.p.A.)
• Inventors: Di Domizio, Richard A., Hecht, Kurt
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US08/606,426
• Time in Patent Office: 949 Days
• Field of Search: 235/454, 235/455, 235/474, 235/462, 250/223 R, 250/568, 250/205
• US Class Current: 235/455
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: H04N 1/00981 by forced convection, e.g. using fans
• 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 1/0286 in combination with a light integrating, concentrating or defusing cavity
• CPC Class Codes: H04N 1/0287 using a tubular lamp or a combination of such lamps
• CPC Class Codes: H04N 1/0318 Integral pick-up heads, i.e. self-contained heads whose basic elements are a light-source, a lens array and a photodetector array which are supported by a single-piece frame
• CPC Class Codes: H04N 1/401 Compensating positionally unequal response of the pick-up or reproducing head H04N1/403 takes precedence
• CPC Class Codes: H04N 2201/02462 Illuminating means
• CPC Class Codes: H04N 2201/02485 Dedicated element, e.g. bracket or arm
• CPC Class Codes: H04N 2201/03112 Light source
• CPC Class Codes: H04N 2201/0312 Reflecting element upstream of the scanned picture elements
• CPC Class Codes: H04N 2201/03129 Transparent cover or transparent document support mounted on the head
• CPC Class Codes: H04N 2201/03141 Photodetector lens
• CPC Class Codes: H04N 2201/03158 Heat radiator
• CPC Class Codes: H04N 2201/0317 Shape
• CPC Class Codes: H04N 2201/04767 by controlling the timing of the signals, e.g. by controlling the frequency o phase of the pixel clock

Abstract

A high speed imaging apparatus for CCD based scanners comprises a housing having separate compartments which complement modular assemblies installed therein. A decoder compartment houses components associated with locating and decoding an image. An optics compartment houses the mirrors and associated optics for reflecting the subject image onto the CCD detector. A lighting compartment includes high intensity lamps and the associated components for illuminating an object to be imaged. The lighting compartment includes a heat management system which removes the heat from the high intensity lamps and prevents heat from migrating to other compartments within the housing.

Claims

1. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region; and

said reflector means including means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region;

means for focusing reflected light onto said detecting means; and

means for monitoring the intensity of said light producing means comprising a photo sensitive element and means for transmitting light from said light producing means to said element.

2. The apparatus of claim 1 wherein said transmitting means comprises a thermally conductive tube for thermally insulating said element from said light producing means.

3. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region,

said reflector means including means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region, said light detecting means comprising a CCD camera head unit having a CCD detector and an image processor; and

means for focusing reflected light onto said detecting means.

4. The apparatus of claim 3 further comprising:

a conveyor, for moving objects past said light detecting means; and

means for resealing the line clock of the CCD detector comprising;

means for measuring the speed of said conveyor;

means for determining the distance between the object and said light detecting means; and

means for calculating a new line clock rate based upon said speed and said distance.

5. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region,

said reflector means including means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region;

means for focusing reflected light onto said detecting means;

means for determining the distance between the object and said light detecting means; and

means for modulating the intensity of said light producing means, said modulating means being responsive to said distance.

6. The apparatus of claim 5 wherein said modulating means increases the intensity of said light producing means as said distance increases and decreases the intensity of said light producing means as said distance decreases.

7. The apparatus of claim 6 further including means for determining the speed of the object relative to said light detecting means, said modulating means being further responsive to said speed.

8. The apparatus of claim 7 wherein said modulating means increases the intensity of said light producing means as said speed increases and decreases the intensity of said light producing means as said speed decreases.

9. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region

said reflector means including means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region; and

means for focusing reflected light onto said detecting means;

said heat removing means comprising a plurality of thermally conductive heatsink fins, and said illuminating means further comprising a blower for producing a flow of air across said heatsink fins to remove heat, said flow of air being transverse to said heatsink fins,

said light producing means, said reflector means and said blower being housed in a compartment separate from other compartments of said imaging apparatus, thereby providing distinct thermal separation between said compartments.

10. The apparatus of claim 9, further comprising an electronic compartment adjacent to said separate compartment, the flow of air across said fins isolating and preventing degradation of components in said electronics compartment by the heat from said light producing means.

11. The apparatus of claim 10 comprising means for directing said flow of air so as to continue adjacent to said electronics compartment after passing across said fins.

12. The apparatus of claim 11 further comprising a fan for removing heat from said electronics compartment.

13. The apparatus of claim 9, wherein the ends of the fins of the reflector means are suspended directly at the sidewalls of the separate compartment whereby heat is radiated along the fins and onto the sidewalls.

14. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region; and

said reflector means including means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region; and

means for monitoring the intensity of said light producing means comprising a photo sensitive element and means for transmitting light from said light producing means to said element.

15. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region,

said reflector means including means integral with said reflector means for removing heat generated by said light producing means; and

detecting means for receiving reflected light from said object when disposed within the region, said light detecting means comprising a CCD camera head unit having a CCD detector.

16. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region

said reflector means including means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region;

said heat removing means comprising a plurality of thermally conductive heatsink fins, and said illuminating means further comprising a blower for producing a flow of air across said heatsink fins to remove heat, said flow of air being transverse to said heatsink fins,

said light producing means, said reflector means and said blower being housed in a compartment separate from other compartments of said imaging apparatus, thereby providing distinct thermal separation between said compartments.

17. An apparatus for imaging an object within a predetermined region comprising:

means for illuminating the region comprising;

means for producing light;

reflector means for directing said light toward said region; and

said reflector means includes means integral with said reflector means for removing heat generated by said light producing means;

detecting means for receiving reflected light from said object when disposed within the region; and

means for focusing reflected light onto said detecting means;

said illuminating means further comprising aperture means which selectively blocks illumination from said light producing means to provide an even illumination intensity in said region.