# US 10,871,370 B2 · Measurement device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,370 B2 - Document ID: US10871370B2 - Status: Granted - Kind: B2 - Application number: 15/909,461 - Filed: 2018-03-01 - Published: 2018-09-20 - Granted: 2020-12-22 - Earliest claimed: 2017-03-02 - Assignees: Topcon Corporation - Applicants: Topcon Corporation - Inventors: Ikuo Ishinabe; Fumio Ohtomo - Web page: https://patentgrep.com/patent/US10871370B2 ## CPC - G01C 3/08: Use of electric radiation detectors - G01B 11/026: {by measuring distance between sensor and object (G01B11/0608 takes precedence)} - G01C 15/002: {Active optical surveying means (optical plumbing G01C15/105)} - G01S 7/4814: {of transmitters alone} - G01S 7/4816: {of receivers alone} - G01S 7/497: Means for monitoring or calibrating - G01S 7/51: Display arrangements - G01S 17/08: for measuring distance only (indirect measurement G01S17/46; active triangulation systems G01S17/48) - G01S 17/42: Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) - G01S 17/86: Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders - 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) - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - 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 ## Abstract The measurement device includes a light source that emits the distance measurement light, a focusing member that transmits the reflected distance measurement light and reflects reflected collimated light to form an image of the measurement target object, the reflected collimated light being reflected by the measurement target object and in a wavelength band different from a wavelength band of the reflected distance measurement light, a distance measurement light reception unit that receives the reflected distance measurement light that has been transmitted through the focusing member and the internal reference light, and a collimated light reception unit that receives the reflected collimated light reflected by the focusing member. ## Claims ### Claim 1 A measurement device that irradiates a measurement target object with distance measurement light and measures a distance to the measurement target object based on reflected distance measurement light that is the distance measurement light reflected on the measurement target object and internal reference light, the measurement device comprising: a light source that emits the distance measurement light; a focusing member that transmits the reflected distance measurement light and reflects reflected collimated light to form an image of the measurement target object, the reflected collimated light being reflected by the measurement target object and in a wavelength band different from a wavelength band of the reflected distance measurement light; a distance measurement light reception unit that receives the reflected distance measurement light that has been transmitted through the focusing member and the internal reference light; a collimated light reception unit that receives the reflected collimated light reflected by the focusing member; a reflection mirror that is disposed on an optical path between the focusing member and the collimated light reception unit, disposed on an optical axis on which the focusing member is also disposed, and reflects the reflected collimated light that has been reflected by the focusing member, toward the collimated light reception unit; and an objective lens that is disposed on the optical axis, wherein the focusing member is a plate shaped member that does not condense the reflected distance measurement light, the focusing member transmits the reflected distance measurement light and causes the distance measurement light reception unit to receive the reflected distance measurement light, the reflected distance measurement light being reflected by the measurement target object and condensed by the objective lens, and the focusing member reflects the reflected collimated light and causes the reflection mirror to further reflect the reflected collimated light and causes the collimated light reception unit to receive the reflected collimated light, the reflected collimated light being reflected by the measurement target object and condensed by the objective lens. ### Claim 2 (depends on 1) The measurement device according to claim 1, wherein the collimated light reception unit is an image sensor that converts brightness of the image formed by the focusing member, indicated by the reflected collimated light, into an electric signal. ### Claim 3 (depends on 2) The measurement device according to claim 2, wherein the focusing member is a bandpass filter that transmits light in the wavelength band corresponding to the reflected distance measurement light. ### Claim 4 (depends on 2) The measurement device according to claim 2, wherein the focusing member is a semitransparent mirror that reflects light in the wavelength band corresponding to the reflected collimated light. ### Claim 5 (depends on 1) The measurement device according to claim 1, wherein the focusing member is a bandpass filter that transmits light in the wavelength band corresponding to the reflected distance measurement light. ### Claim 6 (depends on 1) The measurement device according to claim 1, wherein the focusing member is a bandpass filter that transmits light in the wavelength band corresponding to the reflected distance measurement light. ### Claim 7 (depends on 1) The measurement device according to claim 1, wherein the collimated light reception unit is an image sensor that converts brightness of the image formed by the focusing member, indicated by the reflected collimated light, into an electric signal. ### Claim 8 (depends on 1) The measurement device according to claim 1, wherein the focusing member is a semitransparent mirror that reflects light in the wavelength band corresponding to the reflected collimated light. ### Claim 9 (depends on 1) The measurement device according to claim 1, wherein the focusing member is a semitransparent mirror that reflects light in the wavelength band corresponding to the reflected collimated light. ### Claim 10 (depends on 1) The measurement device according to claim 1, wherein the collimated light reception unit forms an image of the measurement target object on the collimated light reception unit with moving along an optical axis of the light reflected by the reflection mirror. ### Claim 11 (depends on 1) The measurement device according to claim 1, wherein the focusing member forms an image of the measurement target object on the collimated light reception unit with moving along the optical axis.