US Patent No: 5,057,681

Number of patents in Portfolio can not be more than 2000

Long range triangulating coordinate finder

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A system for establishing a base between a light projecting station and a light receiving station of a triangulating coordinate finder incorporates a target on the light transmitting station and a reflector appropriately positioned relative to a photo sensitive receiving array in the light receiving station. A beam of light is directed through a peep hole through the target onto the reflector and is reflected back onto the target. By adjusting the relative orientation of the two stations so that the light beam is reflected back from the reflecting surface in a direction substantially co-axial with the beam of light projecting through the peep hole the bases of the two stations are arranged to be substantially in the same plane and on a base line. The base length between the two stations is measured and the orientation of the projected beam and the focal axis of the receiving station are established relative to the base line to provide coordinates for the triangulating coordinate finder. When scanning over long distances, or under conditions of varying ambient light and different colored background, the amount of light received in the light receiving station may vary due to conditions other than the change in distance. It is therefore preferred to threshold the signal received and use only those signals above a pre-determined threshold to establish accepted signals and to examine the overall signal and determine those areas where no accepted signal has been registered and rescan those areas using a slower scan rate, i.e. a longer illumination time (more light applied) per unit area per unit time of exposure or increase the exposure per unit area scanned.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
RANGE VISION INC.NORTH VANCOUVER BRITISH COLUMBIA V7J 1G41

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Beder, Douglas S Vancouver, CA 3 16
Cornwall, Gordon E North Vancouver, CA 1 5
Dieno, David A Port Coquitlam, CA 1 5
Lang, Curtis E North Vancouver, CA 2 13
Sloan, David S Burnaby, CA 1 5

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CANON KABUSHIKI KAISHA (1)
4,874,239 Distance measuring device 6 1988
 
Gewerkschaft Eisenhutte Westfalia (1)
4,732,472 Methods of, and systems for, determining the position of an object 22 1985
 
Honeywell Inc. (1)
4,410,804 Two dimensional image panel with range measurement capability 56 1981
 
Sokkisha Co., Ltd. (1)
4,311,382 Universally adjustable ranging target and retro-reflector housing bracket 30 1980
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (1)
4,893,025 Distributed proximity sensor system having embedded light emitters and detectors 95 1988

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
ASIA OPTICAL INTERNATIONAL LTD. (1)
8,169,598 Rangefinder 1 2010
 
INSTRO PRECISION LIMITED (1)
7,248,344 Surface profile measurement 9 2002
 
KEYMED (MEDICAL & INDUSTRIAL EQUIPMENT) LTD. (1)
6,482,148 Optical scope with measuring system 5 1999
 
MICROSOFT INTERNATIONAL HOLDINGS B.V. (1)
6,765,606 Three dimension imaging by dual wavelength triangulation 5 2000
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
5,218,414 Distance measuring apparatus utilizing two-dimensional image 7 1992