# US 2013/0155028 A1 · Optical position detection device, hand device, and display device with position detection function > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155028 A1 - Document ID: US20130155028A1 - Status: Published application - Kind: A1 - Application number: 13/765,348 - Filed: 2013-02-12 - Published: 2013-06-20 - Earliest claimed: 2009-12-01 - Assignees: Seiko Epson Corporation - Inventors: Daisuke NAKANISHI - Web page: https://patentgrep.com/patent/US20130155028A1 ## CPC - G01B 11/14: for measuring distance or clearance between spaced objects or spaced apertures (G01B11/26 takes precedence; rangefinders G01C3/00) - B25J 19/021: {Optical sensing devices} - G01D 5/34715: {Scale reading or illumination devices} - G06F 3/042: by opto-electronic means - G06F 3/0425: {using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected (tracking a projected light spot to determine a position on a display surface G06F3/0386)} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - B25J: MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES ({manipulators specially adapted for use in surgery A61B34/70; manipulators used in cleaning hollow articles B08B9/04}; manipulators associated with rolling mills B21B39/20; manipulators associated with forging machines B21J13/10; {manipulators associated with picking-up and placing mechanisms B23P19/007}; means for holding wheels or parts thereof B60B30/00; {vehicles with ground-engaging propulsion means, e.g. walking members B62D57/02, B62D57/032; devices for picking-up and depositing articles or materials between conveyors B65G47/90, B65G47/91; manipulators with gripping or holding means for transferring packages B65H67/065}; cranes B66C; {manipulators used in the protection or supervision of pipe-line installations F17D5/00; walking equipment adapted for nuclear steam-generators F22B37/006}; manipulators specially adapted for, or associated with, nuclear reactors G21C; {apparatus used for handling wafers during manufacture or treatment of semiconductor H10P72/50}) - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A position detection device includes: a light source adapted to form a light intensity distribution of a detection light beam; a first detector adapted to receive a reflected light beam of the detection light beam reflected by an object in a detection area where the light intensity distribution is formed; a transmissive member disposed between the detection area and the light source, and between the detection area and the first detector, and having a first surface directed toward the detection area and a second surface directed toward the light source; a second detector adapted to receive a light beam reflected by the second surface out of the detection light beam; a position detector adapted to detect the object based on the detection result in the first detector; and a light blocking member disposed between the second detector and the detection area, and adapted to block the reflected light beam. ## Claims ### Claim 1 A position detection device adapted to detect a position of a target object, comprising: a light source section forming a light intensity distribution of a detection light beam; a first light detector receiving a reflected light beam of the detection light beam reflected by the target object; a transmissive member disposed between the detection area and the light source section, and between the detection area and the first light detector; a second light detector receiving a light beam reflected by the transmissive member out of the detection light beam emitted from the light source section; and a light blocking member disposed between the second light detector and the transmissive member, and adapted to block the reflected light beam. ### Claim 2 (depends on 1) The position detection device according to claim 1, wherein the second light detector is disposed at a position overlapping the first light detector in a plan view with respect to a flat surface of the transmissive member. ### Claim 3 (depends on 1) The position detection device according to claim 1, wherein the light source section forms a first light intensity distribution in which the intensity varies in a direction from one side toward the other side in the detection area, and a second light intensity distribution having an intensity variation in a direction from the other side toward the one side different from the first light intensity distribution, and the position detection section detects a position of the target object based on a comparison result between a detection result in the first light detector when forming the first light intensity distribution, and a detection result in the first light detector when forming the second light intensity distribution. ### Claim 4 (depends on 1) The position detection device according to claim 1, wherein the light source section forms a first light intensity distribution in which the intensity varies in a direction from one side toward the other side in the detection area, and a second light intensity distribution having an intensity variation in a direction from the other side toward the one side different from the first light intensity distribution, and varies an emission intensity of the detection light beam so that the detection result in the first light detector when forming the first light intensity distribution and the detection result in the first light detector when forming the second light intensity distribution become equal to each other, and the position detection section detects a position of the target object based on one of the emission intensity of the detection light beam from the light source section after varying the emission intensity of the detection light beam and the detection result in the second light detector. ### Claim 5 (depends on 3) The position detection device according to claim 3, wherein environment light enters the first light detector and the second light detector. ### Claim 6 A hand device provided with a position detection device adapted to detect a position of a target object, comprising: a light source section forming a light intensity distribution of a detection light beam; a first light detector receiving a reflected light beam of the detection light beam reflected by the target object; a transmissive member disposed between the detection area and the light source section, and between the detection area and the first light detector; a second light detector receiving a light beam reflected by the transmissive member out of the detection light beam emitted from the light source section; alight blocking member disposed between the second light detector and the transmissive member, and adapted to block the reflected light beam; and a hand adapted to grip the target object. ### Claim 7 A display device with a position detection function adapted to detect a position of a target object, comprising: a light source section forming a light intensity distribution of a detection light beam; a first light detector receiving a reflected light beam of the detection light beam reflected by the target object; a transmissive member disposed between the detection area and the light source section, and between the detection area and the first light detector; a second light detector receiving a light beam reflected by the transmissive member out of the detection light beam emitted from the light source section; alight blocking member disposed between the second light detector and the transmissive member, and adapted to block the reflected light beam; and an image generation device adapted to display an image.