High resolution charge-coupled device (CCD) camera system

• US 5,182,647 A
• Filed: 12/13/1990
• Issued: 01/26/1993
• Est. Priority Date: 12/13/1990
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Chang, Win-Chyi
• Primary Examiner(s): Kostak, Victor R.
• Assistant Examiner(s): HSIA, SHERRIE Y
• Application Number:
  US07/627,136
• Time in Patent Office: 775 Days
• Field of Search: 358/213.11, 358/213.16, 358/213.17, 358/213.23, 358/213.25, 358/213.28, 358/213.31, 357/24 LR, 357/24 M
• US Class Current: 348/298
• CPC Class Codes: H01L 27/1485 Frame transfer
• CPC Class Codes: H01L 29/76841 Two-Phase CCD
• CPC Class Codes: H04N 25/63 applied to dark current

Abstract

The present invention is a high resolution charge-coupled device (CCD) camera system having a CCD camera which is capable of operating at a low data rate (e.g., 1 to 2.5 MHz) that is compatible with the input data rate of a computer. An output of the CCD camera is coupled through an analog-to-digital converter (A/D) to an input of the computer which receives and analyzes the output of the camera. The CCD camera contains a CCD image sensor which is a two phase sensor capable of operating in a mode where holes are accumulated at room temperature so as to reduce the dark current generated in the sensor. Thus, the CCD camera system is of simple construction so as to be relatively inexpensive and can operate at room temperature with reduced dark current.

Claims

1. A camera system comprising:

a computer adapted to receive at an input thereof input data and to analyze the output signals of a CCD camera;

a high resolution CCD camera having at least one million pixels and operating at a low data rate of between 1 and 2.5 MHz compatible with the input data rate of the computer, said camera having a CCD image sensor which is capable of operation in a mode where holes are accumulated at room temperature to reduce any dark current, and

an A/D converter directly coupling an output of the CCD camera to the input of the computer.

2. The camera system of claim 1 in which the CCD image sensor is a two phase CCD having a pair of conductive gates for each pixel.

3. The camera system of claim 2 further comprising means for applying a negative voltage to all of the conductive gates during the exposure time of the CCD image sensor so that the CCD sensor operates to accumulate holes and thereby reduce the dark current generated in the sensor.

4. The camera system of claim 3 in which the CCD image sensor further comprises:

a substrate of a semiconductor material having a surface;

a plurality of spaced, parallel vertical channel regions in the substrate at said surface; and

a plurality of conductive gates extending over and insulated from said substrate surface and extending transversely across the channel regions.

5. The camera system of claim 4, in which the conductive gates comprise a first set of the gates spaced along the length of the channel regions and a second set of gates alternating along said channel regions with said first set of gates, each pair of adjacent first and second gates defining a pixel of the channel regions, and each set of gates being connected to a separate voltage source to provide the two phases of the sensor.