# US 2020/0404155 A1 · Position detecting apparatus and optical apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0404155 A1 - Document ID: US20200404155A1 - Status: Published application - Kind: A1 - Application number: 16/905,748 - Filed: 2020-06-18 - Published: 2020-12-24 - Earliest claimed: 2019-06-20 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Hiroki Ito - Web page: https://patentgrep.com/patent/US20200404155A1 ## CPC - G03B 17/14: interchangeably - H04N 23/67: Focus control based on electronic image sensor signals - G01B 11/028: {by measuring lateral position of a boundary of the object (G01B11/022, G01B11/024, G01B11/04 take precedence)} - G03B 5/00: Adjustment of optical system relative to image or object surface other than for focusing - H04N 23/663: for controlling interchangeable camera parts based on electronic image sensor signals - G03B 13/36: Autofocus systems - G03B 2205/0046: Movement of one or more optical elements for zooming - G03B 2205/0053: Driving means for the movement of one or more optical element - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS ## Abstract A position detecting apparatus includes a rotating member rotatable and having a first cam and a second cam, a first detector, a second detector, and a rotational position acquirer. The first cam moves the first moving unit in a first rotational range of the rotating member and a second rotational range following the first rotational range. The second cam moves the second moving unit in the second rotational range of the rotating member and a third rotational range following the second rotational range. The rotational position acquirer acquires the rotational position using the first signal in the first rotational range and in part on a first rotational range side in the second rotational range, and acquires the rotational position using the second signal in the third rotational range and in part on a third rotational range side in the second rotational range. ## Claims ### Claim 1 A position detecting apparatus comprising: a rotating member rotatable and having a first cam and a second cam; a first detector having a first moving unit moved by the first cam as the rotating member rotates, the first detector being configured to output a first signal corresponding to a position of the first moving unit; a second detector having a second moving unit moved by the second cam as the rotating member rotates, the second detector being configured to output a second signal corresponding to a position of the second moving unit; and a rotational position acquirer configured to acquirer a rotational position of the rotating member using the first signal and the second signal, wherein the first cam moves the first moving unit in a first rotational range of the rotating member and a second rotational range following the first rotational range, wherein the second cam moves the second moving unit in the second rotational range of the rotating member and a third rotational range following the second rotational range, and wherein the rotational position acquirer acquires the rotational position using the first signal in the first rotational range and in part on a first rotational range side in the second rotational range, and acquires the rotational position using the second signal in the third rotational range and in part on a third rotational range side in the second rotational range. ### Claim 2 (depends on 1) The position detecting apparatus according to claim 1, wherein the second cam does not move the second moving unit in the first rotational range. ### Claim 3 (depends on 1) The position detecting apparatus according to claim 1, wherein the first cam does not move the first moving unit in the third rotational range. ### Claim 4 (depends on 1) The position detecting apparatus according to claim 1, wherein the first cam moves the first moving unit in the third rotational range in a direction opposite to a moving direction of the first moving unit in the first and second rotational ranges. ### Claim 5 (depends on 1) The position detecting apparatus according to claim 1, wherein at least part of each of the first cam and the second cam is formed in the same area in the rotating member in a rotating direction of the rotating member. ### Claim 6 (depends on 1) The position detecting apparatus according to claim 1, wherein at least part of each of the first cam and the second cam is formed in the same area in the rotating member in moving directions of the first and second moving units. ### Claim 7 (depends on 1) The position detecting apparatus according to claim 1, wherein the first cam has a first zero-lift cam portion that does not move the first moving unit in the third rotational range, and the second cam has the second zero-lift cam portion that does not move the second moving unit in the first rotational range, and wherein a dividing line of a mold used to mold the rotating member is set so as to pass through the first zero-lift cam portion and the second zero-lift cam portion. ### Claim 8 (depends on 1) The position detecting apparatus according to claim 1, wherein the first detector includes a first output unit configured to output the first signal, and the second detector includes a second output unit configured to output the second signal, and the first output unit and the second output unit are arranged on opposite sides in moving directions of the first and second moving units. ### Claim 9 (depends on 1) The position detecting apparatus according to claim 1, wherein the first detector and the second detector have configurations equal to each other. ### Claim 10 (depends on 1) The position detecting apparatus according to claim 1, wherein the first detector and the second detector are arranged adjacent to each other in a rotational direction of the rotating member. ### Claim 11 An optical apparatus comprising: a position detecting apparatus; and an optical element configured to move in an optical axis direction as a rotating member rotates, wherein the position detector includes: a rotating member rotatable and having a first cam and a second cam; a first detector having a first moving unit moved by the first cam as the rotating member rotates, the first detector being configured to output a first signal corresponding to a position of the first moving unit; a second detector having a second moving unit moved by the second cam as the rotating member rotates, the second detector being configured to output a second signal corresponding to a position of the second moving unit; and a rotational position acquirer configured to acquirer a rotational position of the rotating member using the first signal and the second signal, wherein the first cam moves the first moving unit in a first rotational range of the rotating member and a second rotational range following the first rotational range, wherein the second cam moves the second moving unit in the second rotational range of the rotating member and a third rotational range following the second rotational range, and wherein the rotational position acquirer acquires the rotational position using the first signal in the first rotational range and in part on a first rotational range side in the second rotational range, and acquires the rotational position using the second signal in the third rotational range and in part on a third rotational range side in the second rotational range.