Endoscope provided with a distally located color CCD

• US 5,594,497 A
• Filed: 12/20/1995
• Issued: 01/14/1997
• Est. Priority Date: 04/07/1993
• Status: Expired due to Fees

• Current Assignee: John M. Ahern, Stephen Koo
• Original Assignee: John M. Ahern, Stephen Koo
• Inventors: Ahern, John M., Koo, Stephen
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US08/575,463
• Time in Patent Office: 391 Days
• Field of Search: 348/71, 348/65, 348/66, 348/68
• US Class Current: 348/71
• CPC Class Codes: A61B 1/05 characterised by the image sensor, e.g. camera, being in the distal end portion
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/555 for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
• CPC Class Codes: H04N 23/56 provided with illuminating means

Abstract

The present invention is directed to an endoscope provided with a color CCD chip located in the distal end of the endoscope. The CCD chip directly produces a chromatic signal which is sent to a video system center and then to a monitor for viewing.

Claims

1. An endoscope for viewing a scene, within the body of a human or an animal, comprising

an elongated tube having distal and proximal ends, the diameter of said elongated tube being equal to or less than 10 mm;

an objective lens system provided in said distal end of said elongated tube, said objective lens system comprising first and second lenses, a lens diaphragm having an aperture therein, said lens diaphragm provided between said first and second lenses, a first spacer provided in front of said first lens, a second spacer provided between said lens diaphragm and said second lens;

a nut provided in front of said first spacer for positioning said objective lens system; and

a color charge coupled device having a diameter equal to or less than 8.6 mm provided in said distal end of said elongated tube behind said objective lens system, said charge coupled device directly providing a chromatic signal based upon the viewed scene, said charge coupled device connected to one or more electrical wires for transmitting said chromatic signal from said distal end of said elongated tube to said proximal end of said elongated tube.

2. The endoscope in accordance with claim 1, further including a filter assembly provided between said objective lens system and said color charge coupled device, said filter assembly including three crystal filters and an infrared filter.

3. The endoscope in accordance with claim 1, further including an inner tube provided within and extending the entire length of said elongated tube, and a fiber optic bundle provided between said inner tube and said elongated tube, said fiber optic bundle extending from said distal end of said elongated tube to said proximal end of said elongated tube.

4. An endoscopic system for viewing a scene within the body of a human or an animal, comprising,

an elongated tube having distal and proximal ends, the diameter of said elongated tube being equal to or less than 10 mm;

an objective lens system provided in said distal end of said elongated tube;

said objective lens system comprising first and second lenses, a lens diaphragm having an operative therein, said lens diaphragm provided between said first and second lenses, a first spacer provided in front of said first lens, a second spacer provided between said lens diaphragm and said second lens;

a nut provided in front of said first spacer for positioning said objective lens system;

a color charge coupled device having a diameter being equal to or less than 8.6 mm provided in said distal end of said elongated tube behind said objective lens system, said charge coupled device directly providing a chromatic signal based upon the viewed scene, said charge coupled device connected to one or more electrical wires for transmitting said chromatic signal from said distal end of said tube to said proximal end of said tube;

a chromatic signal processing circuit connected to said one or more electrical wires and provided external to said elongated tube; and

a monitor connected to said chromatic signal processing circuit for viewing the scene.

5. The endoscopic system in accordance with claim 6, further including a filter assembly provided between said objective lens system and said color charge coupled device, said filter assembly including three crystal filters and an infrared filter.

6. The endoscopic system in accordance with claim 4, further including an inner tube provided within and extending the entire length of said elongated tube, and a fiber optic bundle provided between said inner tube and said elongated tube, said fiber optic bundle extending from said distal end of said elongated tube to said proximal end of said elongated tube, and a light source connected to said fiber optic bundle extending from the proximal end of said elongated tube, said light source provided external to said elongated tube.

7. The endoscopic system in accordance with claim 4, further including a filter assembly provided between said objective lens system and said color charge coupled device, said filter assembly including three crystal filters and an infrared filter.