Portable color imager borescope

• US 4,941,456 A
• Filed: 10/05/1989
• Issued: 07/17/1990
• Est. Priority Date: 10/05/1989
• Status: Expired due to Term

• Current Assignee: GE Inspection Technologies LP (General Electric Company)
• Original Assignee: Welch Allyn Incorporated
• Inventors: Wood, Robert J., Slee, Earl H., Pileski, Michael J., Pasik, Gregory E.
• Primary Examiner(s): Grieb, William H.
• Application Number:
  US07/417,553
• Time in Patent Office: 285 Days
• Field of Search: 128/4, 128/6, 356/241, 358/98
• US Class Current: 600/152
• CPC Class Codes: G02B 23/2476 Non-optical details, e.g. housings, mountings, supports

Abstract

A portable steerable borescope has a cable bendable steering section adjacent the viewing head, a servo control mechanism for the actuation cables of the bendable steering section, a joystick for actuating the steering section which is located remotely from the insertion tube and a control module/battery pack containing all the operating functions except for the video display which is a standard JVC portable color video monitor, all of which cooperate to yield a compact and portable industrial video borescope that can be used in remote locations as well as in conventional commercial power environments. Special circuitry has been provided to limit power consumption allowing over one hour remote operation without external power or large, heavy cumbersome batteries.

Claims

1. A portable steerable borescope or endoscope of the type having, a viewing head, an insertion tube with a cable bendable steering section proximally of the viewing head, at least one pair of steering cables, a fiber optic object illumination channel connected to said viewing head, and an object image channel connected to said viewing head, which comprises;

an image sensor in said viewing head;

servo motor operatively connected to each pair of steering cables in said bendable steering section;

servo control means connected to said servo motor for operating said servo motor,

remote actuator means operatively connected to said servo control means to permit an operator to manipulate said steering section by controlling the rotation of said servo motors;

lamp means positioned to illuminate the object through said fiber optic illumination channel;

video processor means for transforming the object image from said image channel into NTSC format for display;

lamp dimmer means connected to said lamp means and said video processor means for controlling the light output of said lamp means in accordance with the video signal from said image sensor to provide optimum video image brightness;

video display means connected to the output of said video processor, via an extended flexible cable for locating said display means remotely from said servo, lamp and video processor means, and

power supply means including a battery pack and means for selectively converting commercial alternating current power to direct current power for charging the battery pack and operating the borescope/endoscope.

2. A portable steerable borescope as described in claim 1 wherein said power supply means includes said battery pack being interchangeable with other similar battery packs;

an external twelve volt connection for selectively accessing an external battery source;

an external one-hundred-ten/two-hundred twenty volt connection for accessing commercial power;

rectifier means for converting said one-hundred-ten/two-hundred-twenty volt AC to twelve volt DC; and

DC-to-DC converting means for changing the twelve volt DC voltage into a plurality of other DC voltages required to operate the device.

3. A portable steerable borescope as described in claim 2 wherein said battery pack comprises four six-volt batteries connected in a series parallel circuit to form a twelve volt output and said batteries are sealed in a plastic container with a banana plug type receptacle positioned in a recess at one end.

4. A device as described in claim 1 wherein said image sensor is a full color solid state image sensor mounted in the viewing head of said insertion tube.

5. A device as described in claim 4 in which said solid state image sensor is a CCD chip having 248,000 pixel full color capability.

6. A device as described in claim 1 in which said video display means is a full color portable five inch diagonal diameter JVC color monitor.

7. A device as described in claim 1 wherein the actuator means comprises a joystick control, including a pair of variable resistors, one being actuated by movement of the joystick in the plus or minus X direction, and one being actuated by movement of the joystick in the plus or minus Y direction.

8. A device as described in claim 1 wherein said lamp means comprises a 75 watt halogen lamp.

9. A device as described in claim 1 wherein said lamp dimmer means comprises, circuit means for turning off said lamp to reduce the illuminating power required to the minimum amount to illuminate the object as determined by the video signal from the image sensor device in the viewing head.

10. The device of claim 1 wherein said cable bendable steering section of the insertion tube includes two pair of control cables each having a servo motor operatively connected thereto and to said servo control means whereby said bendable insertion tube can be actuated in full three dimensional fashion.

11. A device as described in claim 10 wherein said servo control means includes cable tension relieving means for preventing stretching of the actuation cables in the cable bendable steering section of the insertion tube.

12. A portable steerable borescope or endoscope of the type having, a viewing head, an insertion tube with a cable bendable steering section proximally of the viewing head, at least one pair of steering cables, a fiber optic object illumination channel connected to said viewing head, an image sensor in said viewing head, and an object image channel connected to said viewing head, which comprises;

a pair of servo motors each operatively connected to a pair of steering cables extending to said bendable section;

steering control circuit means for controlling the rotation of said servo motors;

lamp means positioned to illuminate the object to be viewed via said fiber optic illumination channel,

video processor means for transforming the object image from said image channel into format for video display,

lamp dimmer means connected to said lamp and said video processor for controlling the light output of said lamp in accordance with the video signal from said image sensor to provide optimum video image brightness,

DC-to-DC converter means for changing twelve volts DC to all the voltages required to operate the borescope;

twelve volt DC battery means connected to said DC-to-DC converter means;

all of the foregoing means and apparatus being contained in a single control module box;

separate video display means operatively connected to said control module box; and

separate actuator means for said steering control circuit operatively connected to said control module by a flexible cable.

13. A device as described in claim 12 wherein said video processor includes dip switch means for adjusting the signal delay to match the length of the insertion tube.

14. In a portable borescope of the type having an insertion tube with a cable steerable section adjacent the viewing head, the combination comprising:

a first housing member having mounted therein;

a plurality of servo motors operatively connected to said cable steerable section;

a servo operating circuit control board for driving said servo motors,

lamp means positioned to transmit through a fiber optic cable light to illuminate the object to be viewed;

video processor means for transforming object images received from the viewing head into standard NTSC format;

lamp dimmer means connected to said lamp and said video processor means for controlling the light output of said lamp in accordance with the video signal from said viewing head to provide optimum video image brightness;

power supply means including a battery pack and means for selectively converting commercial alternating current power to direct current power for charging the battery pack and/or operating the borescope/endoscope;

a second housing member having mounted therein a standard five inch color video monitor;

an actuator for providing electrical signals to said control board to cause said servo motors to move said steerable section proportional to the position of said actuator; and

an insertion tube having a viewing head including an image sensor, a plurality of steering cables attached to said steerable section, a fiber optic illuminating cable, and a video cable, all operatively connected to said viewing head;

so that a compact, fully portable borescope for inspection of objects in inaccessible cavities at remote sites is provided.

15. A device as described in claim 14 further defined by a dual male banana plug mounted in a bracket on said first housing member for limited 360°

movement in a direction at right angles to the axis thereof of each male member, and a pair of female banana plug receptacles mounted in a recess in one end of said battery pack means adapted to receive said male banana plugs when said battery pack is installed in said first housing member.

16. In a portable borescope of the type having an insertion tube with a cable steerable section adjacent the viewing head, the combination comprising:

a first housing member having mounted therein;

a plurality of servo motors operatively connected to said cable steerable section;

a servo operating circuit control board for driving said servo motors,

lamp means positioned to transmit through a fiber optic cable light to illuminate the object to be viewed;

video processor means for transforming object images received from the viewing head into standard NTSC format;

lamp dimmer means connected to said lamp and said video processor means for controlling the light output of said lamp to provide optimum video image brightness;

power supply means including a battery pack and means for selectively converting commercial alternating current power to direct current power for charging the battery pack and/or operating the borescope/endoscope;

a second housing member having mounted therein a standard five inch color video monitor;

an actuator for providing electrical signals to said control board to cause said servo motors to move said steerable section proportional to the position of said actuator; and

an insertion tube having a full color multi-pixel chip mounted in a socket receptacle positioned in the distal end of said viewing head, a plurality of steering cables attached to said steering section, a fiber optic illuminating cable, a video cable, all operatively connected to said viewing head;

so that a compact, fully portable borescope for inspection of objects in inaccessible cavities at remote sites is provided.