Video camera system and related method

• US 6,141,037 A
• Filed: 03/18/1998
• Issued: 10/31/2000
• Est. Priority Date: 03/18/1998
• Status: Expired due to Term

• Current Assignee: Linvatec Corporation (Jefferies Financial Group, Inc.)
• Original Assignee: Linvatec Corporation (Jefferies Financial Group, Inc.)
• Inventors: Upton, Wayne, Walls, Robert
• Primary Examiner(s): Kelley, Chris S.
• Assistant Examiner(s): VO, TUNG T
• Application Number:
  US09/044,090
• Time in Patent Office: 958 Days
• Field of Search: 348/65-68, 348/43, 348/69, 348/70, 348/211, 600/100, 600/110, 600/421, 600/133, 600/112, 128/908
• US Class Current: 348/65
• CPC Class Codes: A61B 1/00016 using wireless means
• CPC Class Codes: A61B 1/00029 externally powered, e.g. wireless
• CPC Class Codes: A61B 1/042 characterised by a proximal camera, e.g. a CCD camera
• 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 23/65 Control of camera operation in relation to power supply
• CPC Class Codes: H04N 23/661 Transmitting camera control signals through networks, e.g. control via the Internet
• CPC Class Codes: Y10S 128/908 Patient protection from electric shock

Abstract

A video camera system is provided in which the camera head is powered at least in part by electrical energy converted from optical energy provided by a light source. In one implementation, communication between the camera head and control circuitry thereof occurs by means of a wireless communications interface.

Claims

1. An endoscopic video camera system comprising:

an endoscope;

control circuitry for processing the electronic image as produced by the imager;

a camera head configured for placement along a first optical path extending through the endoscope;

a light source;

a second optical path extending from the light source to the camera head;

the camera head comprising;

camera head electronics including an imager for producing an electronic image; and

a power source for converting at least a portion of the optical energy as transmitted along the second optical path into electrical energy and using the same to power at least part of the camera head electronics, the power source comprising;

a splitter for segregating a portion of the optical energy transmitted along the second optical path; and

a converter for converting the segregated portion of optical energy into electrical energy,

wherein the converter comprises a plurality of photo voltaic cells arranged over an area which is sufficient to deliver necessary power to the camera head electronics given the efficiency of the cells and the intensity of the incident light, and the splitter is configured to allow approximately uniform distribution of light over the cells.

2. The system of claim 1 further comprising a wireless communications interface for allowing wireless communication between the control circuitry and the camera head.

3. The system of claim 2 in which the wireless communications interface is bidirectional.

4. The system of claim 2 in which the wireless communications interface is unidirectional.

5. The system of claim 2 in which the wireless communications interface comprises:

a transceiver and antenna within or coupled to the camera head; and

a transceiver and antenna within or coupled to the control circuitry.

6. The system of claim 1 in which the second optical path comprises a bundle of optical fibers and the splitter comprises at least one of these fibers peeled away from the others.

7. The system of claim 1 in which the second optical path is implemented with a liquid light guide.

8. The system of claim 1 in which the light source is located outside a control unit enclosing the control circuitry.

9. The system of claim 1 in which the light source is located within a control unit enclosing the control circuitry.

10. The system of claim 1 in which the imager is a solid state imager.

11. The system of claim 1 in which the imager is a CCD.

12. The system of claim 1 in which the imager is a CMOS imager.

13. The system of claim 1 in which the imager and camera head electronics are configured on a single chip.

14. The system of claim 1 in which the second optical path extends through the endoscope.

15. The system of claim 1 in which the imager produces an electronic image upon being actuated by the control circuitry.

16. An endoscopic video camera system comprising:

an endoscope;

control circuitry for processing an electronic image as produced by the imager;

a camera head configured for placement along a first optical path extending through the endoscope;

a wireless communications interface for allowing wireless communication between the control circuitry and the camera head;

a light source;

a second optical path extending from the light source to the camera head;

the camera head comprising;

camera head electronics including a solid state imager for producing an electronic image; and

a power source for powering at least a portion of the camera electronics comprising;

a splitter for segregating a portion of the optical energy transmitted along the second optical path; and

a converter for converting the segregated portion of optical energy to electrical energy,

wherein the converter comprises a plurality of photo voltaic cells arranged over an area sufficient to deliver necessary power to the camera head electronics given the efficiency of the cells and the intensity of the incident light, and the splitter is configured to allow approximately uniform distribution of light over the cells.

17. The system of claim 16 in which the imager produces an electronic image upon being actuated by the control circuitry.

18. An endoscopic video camera system comprising:

an endoscope;

control circuitry for processing an electronic image as produced by the imager;

a camera head configured for placement along a first optical path extending through the imager;

a bidirectional wireless communications interface for allowing wireless communication between the control circuitry and the camera head comprising;

a transceiver and antenna within or coupled to the camera head; and

a transceiver and antenna within or coupled to the control circuitry;

a light source;

a second optical path implemented with a bundle of optical fibers extending from the light source to the camera head;

the camera head comprising;

camera head electronics including a CMOS imager integrated on a single chip for producing an electronic image; and

a power source for powering at least a portion of the camera electronics comprising;

a splitter comprising at least one optical fiber of the bundle forming the second optical path configured to segregate a portion of the optical energy transmitted along the second optical path and distribute the segregated light approximately uniformly over an area; and

a plurality of photo voltaic cells placed within the area for converting the segregated portion of optical energy into electrical energy,

wherein the area is determined sufficient to deliver necessary power to the camera head electronics given the efficiency of the cells and the intensity of the incident light, and the splitter is configured to allow approximately uniform distribution of light over the cells.

19. The system of claim 18 in which the imager produces an electronic image upon being actuated by the control circuitry.

20. A method of operating an endoscopic video camera system comprising:

positioning an endoscope having a distal end so that the distal end is in proximity with a work site;

illuminating the work site through optical energy provided from a light source;

actuating camera electronics including an imager to produce an electronic image of a target at the work site;

segregating at least a portion of the optical energy provided from the light source;

converting the segregated portion of optical energy into electrical energy using a plurality of photocells arranged over an area determined sufficient to deliver necessary power to the camera head electronics given the efficiency of the cells and the intensity of the incident light, while having the segregated portion of the optical energy approximately uniformly distributed over the photocells;

powering at least a portion of the camera electronics with the electrical energy; and

processing the electronic image in control circuitry.

21. The method claim 20 further comprising transferring through a wireless communications interface the electronic image to the control circuitry.

22. The method of claim 20 further comprising displaying the image on a monitor.

23. The method of claim 20 further comprising storing the image in a storage device.

24. The method of claim 20 further comprising transmitting the image.

25. A video camera system comprising:

control circuitry for processing the electronic image as produced by the imager;

a camera head configured for placement along a first optical path;

a light source; and

a second optical path extending from the light source to the camera head;

the camera head comprising;

camera head electronics including an imager for producing an electronic image; and

a power source for converting at least a portion of the optical energy as transmitted along the second optical path into electrical energy and using the same to power at least part of the camera head electronics, the power source comprising;

a splitter for segregating at least a portion of the optical energy transmitted along the second optical path; and

a converter for converting the segregated portion of optical energy into electrical energy,

wherein the converter comprises a plurality of photo voltaic cells arranged over an area determined sufficient to deliver necessary power to the camera head electronics given the efficiency of the cells and the intensity of the incident light, and the splitter is configured to allow approximately uniform distribution of light over the cells.

26. The system of claim 25 further comprising a wireless communications interface for allowing wireless communication between the control circuitry and the camera head.

27. The system of claim 25 further comprising an endoscope wherein the first optical path extends through the endoscope.

28. A method of operating a video camera system comprising:

providing optical energy from a light source;

converting said optical energy into electrical energy using a plurality of photocells arranged over an area determined sufficient to deliver necessary power to camera electronics given the efficiency of the cells and the intensity of the incident light, while having at least of portion of said optical energy approximately uniformly distributed over the plurality of photocells;

providing camera electronics including an imager;

powering at least a portion of the camera electronics with the electrical energy;

actuating the camera electronics to produce an electronic image; and

processing the electronic image.

29. The method of claim 28 further comprising passing the electronic image to control circuitry through a wireless communications interface.

30. A method of reducing electromagnetic interference in a video camera system comprising:

providing optical energy from a light source;

converting said optical energy into electrical energy using a plurality of photocells arranged over an area determined sufficient to deliver necessary power to camera electronics given the efficiency of the cells and the intensity of the incident light, while having at least a portion of said optical energy substantially uniformly distributed over the plurality of photocells;

providing camera electronics including an imager;

powering at least a portion of the camera electronics with the electrical energy;

actuating the camera electronics to produce an electronic image;

providing control circuitry; and

passing the electronic image to the control circuitry through a wireless communication interface.