# US 2023/0053565 A1 · Lens apparatus and image pickup apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0053565 A1 - Document ID: US20230053565A1 - Status: Published application - Kind: A1 - Application number: 17/980,598 - Filed: 2022-11-04 - Published: 2023-02-23 - Earliest claimed: 2019-04-04 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Kota Asano - Web page: https://patentgrep.com/patent/US20230053565A1 ## CPC - G03B 7/00: Control of exposure by setting shutters, diaphragms or filters, separately or conjointly (control of exposure in television cameras by means of circuitry influencing the optical part of the camera H04N23/75) - G03B 9/02: Diaphragms - G03B 9/06: Two or more co-operating pivoted blades, e.g. iris type (shutters functioning as diaphragms by limiting extent of opening movement G03B9/08) - G03B 17/14: interchangeably - 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) ## Abstract A lens apparatus includes an aperture stop, a driving device configured to drive the aperture stop, a storage storing a driving instruction value for driving the aperture stop, and a controller configured to perform control of the driving device based on the driving instruction value. The storage stores the driving instruction value, among a plurality of ones of the driving instruction value, by which an absolute value of a difference, between a target aperture value and an actual aperture value obtained by the control, that is largest with respect to a plurality of ones of the drive amount is minimized. ## Claims ### Claim 1 A lens apparatus comprising: an aperture stop; a driving device configured to drive the aperture stop; a storage storing a driving instruction value for driving the aperture stop, the driving instruction value corresponding to an aperture value set in the aperture stop; and a controller configured to perform control of the driving device based on the driving instruction value, wherein the storage stores the driving instruction value according to a respective driving amount of the aperture stop. ### Claim 2 (depends on 1) The lens apparatus according to claim 1, wherein the storage stores the driving instruction value, with respect to the respective driving amount of the aperture stop, by which an absolute value of a difference between a target aperture value and an actual aperture value is not greater than a threshold. ### Claim 3 (depends on 1) The lens apparatus according to claim 1, wherein the driving instruction value is obtained by comparing a target aperture value and an actual aperture value with respect to the respective driving amount. ### Claim 4 (depends on 1) The lens apparatus according to claim 1, wherein the storage stores the driving instruction value by which an absolute value of a difference between a target aperture value and an actual aperture value is largest with respect to a plurality of driving amounts of the aperture stop and is minimized. ### Claim 5 (depends on 1) The lens apparatus according to claim 1, wherein the storage stores the driving instruction value by which an absolute value of a difference between a target aperture value and an actual aperture value is largest with respect to a plurality of driving amounts of the aperture stop and is not greater than a threshold. ### Claim 6 (depends on 4) The lens apparatus according to claim 4, wherein the driving instruction value is obtained by comparing the target aperture value and the actual aperture value with respect to each of the plurality of driving amounts, and extracting a driving amount at which the absolute value is maximized. ### Claim 7 (depends on 1) The lens apparatus according to claim 1, wherein: the aperture stop is drivable in a first driving direction from a maximum aperture side to a minimum aperture side and in a second driving direction from the minimum aperture side to the maximum aperture side, and the storage stores, as the driving instruction value, a first driving instruction value used for a first case of driving the aperture stop in the first driving direction, and a second driving instruction value used for a second case of driving the aperture stop in the second driving direction, and the controller is configured to control the driving device based on the first driving instruction value in the first case, and control the driving device based on the second driving instruction value in the second case. ### Claim 8 (depends on 1) The lens apparatus according to claim 1, wherein the respective driving amount is an amount corresponding to a difference between the driving instruction value corresponding to a current aperture value of the aperture stop and a next driving instruction value. ### Claim 9 (depends on 1) The lens apparatus according to claim 1, wherein the driving device is configured to perform acceleration driving and deceleration driving of the aperture stop by micro-step driving. ### Claim 10 (depends on 1) The lens apparatus according to claim 1, wherein the storage stores data indicating a relationship between the driving instruction value and the actual aperture value. ### Claim 11 (depends on 10) The lens apparatus according to claim 10, wherein the storage stores the data with respect to at least one of a posture, a driving frequency, or a temperature of the lens apparatus. ### Claim 12 (depends on 11) The lens apparatus according to claim 11, wherein the controller is configured to obtain the driving instruction value based on the at least one of the posture, the driving frequency, or the temperature of the lens apparatus. ### Claim 13 (depends on 1) An image pickup apparatus comprising: a lens apparatus of claim 1; and an image pickup element configured to pick up an image formed via the lens apparatus. ### Claim 14 (depends on 1) The lens apparatus according to claim 1, wherein the storage stores the driving instruction value, with respect to the respective driving amount of the aperture stop, by which an absolute value of a difference between a target aperture value and an actual aperture value is minimized.