# US 4,761,072 A · Electro-optical sensors for manual control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,761,072 A - Document ID: US4761072A - Status: Granted - Kind: A - Application number: 07/110,589 - Filed: 1987-10-19 - Granted: 1988-08-02 - Earliest claimed: 1984-10-03 - Assignees: Diffracto Ltd. - Inventors: Timothy R. Pryor - Web page: https://patentgrep.com/patent/US4761072A ## CPC - G01S 17/48: Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves - G01C 3/10: using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) ## Abstract Novel method and apparatus are disclosed which assist in utilization of ranging type non-contact sensors with coordinate measurement machines (CMM's ) and other machines. Various visual and/or audible indicators are provided to assist the operator in using the machine. ## Claims ### Claim 1 An apparatus for providing an in-range control signal for a non-contact distance measuring sensor of a part where the sensor and part are relatively movable comprising: a determining means for determining if the measuring sensor is within an operating range thereof, said determining means including (a) a light projecting means for projecting a light zone on the part, (b) an imaging means for imaging the projected light zone, and (c) a sensing means for sensing a characteristic of the imaged light zone indicative of the measuring sensor being within the operating range thereof; and a signal means for providing an operating signal when said determining means determines that the measuring sensor is within the operating range thereof. ### Claim 2 (depends on 1) An apparatus according to claim 1 wherein said measuring sensor is a triangulation based on electro-optical sensor projecting a zone of light onto a part surface which zone of light serves as the light zone of said light projecting means, and said imaging means is an image sensing detector. ### Claim 3 (depends on 2) An apparatus according to claim 2 wherein said sensing means of said determining means determines the position of said image on said detector. ### Claim 4 (depends on 2) An apparatus according to claim 2 and further including a reference detector means for compensating for light power as a function of light intensity of said image. ### Claim 5 (depends on 2) An apparatus according to claim 2 wherein said sensing means of said determining means includes a comparison means for comparing a detected light intensity of the imaged light zone to a standard. ### Claim 6 (depends on 4) An apparatus according to claim 4 wherein said reference detector means is a detector capable of detecting both light zone intensity and zone image position. ### Claim 7 (depends on 2) An apparatus according to claim 2 and further including a reference detector means for compensating for image sensing integration time of said image sensing detector. ### Claim 8 (depends on 1) An apparatus according to claim 1 including a range means for providing a range signal which is a function of the range of said measuring sensor from the operating range. ### Claim 9 (depends on 8) An apparatus according to claim 8 wherein said range signal changes in frequency pulse rate as a function of range. ### Claim 10 (depends on 8) An apparatus according to claim 8 wherein said range signal is the same over a nominal operating range and changes as the limits of the operating range is approached. ### Claim 11 (depends on 8) An apparatus according to claim 8 wherein said range signal changes in amplitude as a function of range. ### Claim 12 An apparatus for determining the distance to a part surface comprising: a triangulation based optical sensor for non-contact determining of the exact distance from said triangulation sensor to the part surface; a reference detector means for sensing an approximate distance of said triangulation sensor to the part surface, said reference detector means including (a) a light projecting means for projecting a light zone on the part surface, (b) an imaging means for imaging the projected light zone, and (c) a sensing means for sensing a characteristic of the imaged light zone indicative of the approximate distance of said triangulation sensor to the part surface; and a signal means for providing an operating signal when the approximate distance determined by said reference detector means is within an operating range of said triangulation sensor. ### Claim 13 (depends on 12) An apparatus according to claim 12 wherein said senseing means senses an intensity of the projected light zone and the distance operating signal is produced by the light intensity sensed by said sensing means. ### Claim 14 (depends on 13) An apparatus according to claim 13 wherein said light projecting means includes a light power control means for controlling an intensity of the projected light zone of said triangulation sensor which light power control means is momentarily deactivated by said reference detector means during sensing by said sensing means. ### Claim 15 (depends on 12) An apparatus according to claim 12 wherein said reference detector means detects light intensity and second characteristic of the imaged light zone, which said second characteristic is used to determine the approximate distance and which said light intensity is used to control an operating parameter of said triangulation sensor. ### Claim 16 (depends on 15) An apparatus according to claim 15 wherein said imaging means is a continuous analog type detector.