# US 2019/0246031 A1 · Image-capturing apparatus, accessory apparatus and control method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246031 A1 - Document ID: US20190246031A1 - Status: Published application - Kind: A1 - Application number: 16/383,770 - Filed: 2019-04-15 - Published: 2019-08-08 - Earliest claimed: 2016-07-25 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Atsushi Sugita - Web page: https://patentgrep.com/patent/US20190246031A1 ## CPC - H04N 23/663: for controlling interchangeable camera parts based on electronic image sensor signals - G03B 3/10: Power-operated focusing - G03B 17/14: interchangeably - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - H04N 23/667: Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes - G03B 2205/0007: Movement of one or more optical elements for control of motion blur - G03B 2206/00: Systems for exchange of information between different pieces of apparatus, e.g. for exchanging trimming information, for photo finishing - H04N 23/6812: {based on additional sensors, e.g. acceleration sensors} - H04N 23/687: {by shifting the lens or sensor position} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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 The image-capturing apparatus includes a camera communicator configured to provide, with the accessory apparatus, a first data communication channel used for transmitting accessory data from the accessory apparatus to the image-capturing apparatus, and a second data communication channel used for transmitting camera data from the image-capturing apparatus to the accessory apparatus; and a camera controller configured to perform communication with the accessory apparatus through the camera communicator. The camera controller and the accessory apparatus are configured to be capable of switching their communication modes between a first communication mode and a second communication mode. The camera controller is configured to cause the accessory apparatus to transmit the accessory data whose settings of parity bits are different between in the first and second communication modes. ## Claims ### Claim 1 An image-capturing apparatus to which an accessory apparatus is detachably attachable, the image-capturing apparatus comprising: a camera communicator configured to provide, with the accessory apparatus, a first data communication channel used for transmitting accessory data from the accessory apparatus to the image-capturing apparatus, and a second data communication channel used for transmitting camera data from the image-capturing apparatus to the accessory apparatus; and a camera controller configured to perform communication with the accessory apparatus through the camera communicator, wherein: the camera controller is configured to be capable of switching its communication mode between a first communication mode and a second communication mode; and the camera controller is configured to transmit a request to transmit the accessory data whose settings of parity bits are different in the first and second communication modes. ### Claim 2 (depends on 1) An image-capturing apparatus according to claim 1, wherein, in the first and second communication modes, the settings of the parity bits are different in that the parity bit is added or not added or in that the parity bit indicates even parity or odd parity. ### Claim 3 (depends on 1) An image-capturing apparatus according to claim 1, wherein the parity bit in one of the first and second communication modes indicates even parity or odd parity, and the parity bit in the other thereof is not included. ### Claim 4 (depends on 1) An image-capturing apparatus according to claim 1, wherein the camera controller is configured to detect a parity error of the accessory data and thereby detect a difference in communication mode between the camera controller and the accessory apparatus. ### Claim 5 (depends on 4) An image-capturing apparatus according to claim 4, wherein the camera controller is configured to perform, in response to detecting the difference in communication mode, a matching process for matching the communication modes of the camera controller and the accessory apparatus. ### Claim 6 (depends on 5) An image-capturing apparatus according to claim 5, wherein the camera controller is configured to perform, in response to detecting the difference in communication mode when the communication mode of the camera controller is the first communication mode, the matching process that changes the communication mode of the accessory apparatus to the first communication mode. ### Claim 7 (depends on 5) An image-capturing apparatus according to claim 5, wherein the camera controller is configured to perform, in response to detecting the difference in communication mode when the communication mode of the camera controller is the second communication mode, the matching process that changes the communication mode of the camera controller to the first communication mode. ### Claim 8 (depends on 1) An image-capturing apparatus according to claim 1, wherein: the camera controller is configured to perform asynchronous communication with the accessory apparatus; the camera communicator is configured to provide three channels that are a communication request channel used for providing a communication request from the image-capturing apparatus to the accessory apparatus, and the first and second data communication channels; and the camera controller is configured (a) to provide the communication request to the accessory apparatus through the communication request channel to cause the accessory apparatus to transmit the accessory data to the camera controller through the first data communication channel, and (b) to transmit the camera data to the accessory apparatus through the second data communication channel. ### Claim 9 (depends on 8) An image-capturing apparatus according to claim 8, wherein the camera controller is configured to: in the first communication mode, receive from the accessory apparatus the accessory data to which a communication standby request is added; in the second communication mode, receive from the accessory apparatus the accessory data to which the communication standby request is not added; in the first communication mode, not provide the communication request until the communication standby request is terminated; and in the second communication mode, continue providing the communication request to the accessory apparatus until the communication of a predetermined amount is performed, and switch, in response to completion of the communication of the predetermined amount, the communication mode of the camera controller to the first communication mode. ### Claim 10 (depends on 8) An image-capturing apparatus according to claim 8, wherein the camera controller is configured to perform, in response to detecting a difference in communication mode in the first communication mode, a matching process that does not provide the communication request for a predetermined time and thereby switches the communication mode of the accessory apparatus to the first communication mode. ### Claim 11 An accessory apparatus detachably attachable to an image-capturing apparatus, the accessory apparatus comprising: an accessory communicator configured to provide, with the image-capturing apparatus, a first data communication channel used for transmitting accessory data from the accessory apparatus to the image-capturing apparatus, and a second data communication channel used for transmitting camera data from the image-capturing apparatus to the accessory apparatus; and an accessory controller configured to perform communication with the image-capturing apparatus through the accessory communicator, wherein: the accessory controller is configured to be capable of switching its communication mode between a first communication mode and a second communication mode; and the accessory controller is configured to transmit the accessory data whose settings of parity bits are different in the first and second communication modes. ### Claim 12 (depends on 11) An accessory apparatus according to claim 11, wherein, in the first and second communication modes, the settings of the parity bits are different in that the parity bit is added or not added or in that the parity bit indicates even parity or odd parity. ### Claim 13 (depends on 11) An accessory apparatus according to claim 11, wherein the parity bit in one of the first and second communication modes indicates even parity or odd parity, and the parity bit in the other thereof is not included. ### Claim 14 (depends on 11) An accessory apparatus according to claim 11, wherein the accessory controller is configured to switch the communication mode of the accessory controller, in response to receiving a switch request that requests switching the communication mode on the detection of a parity error of the accessory data. ### Claim 15 (depends on 14) An accessory apparatus according to claim 14, wherein the accessory controller is configured to switch, in response to receiving the switch request on the detection of the difference in communication mode in the first communication mode, the communication mode of the accessory controller to the first communication mode. ### Claim 16 (depends on 11) An accessory apparatus according to claim 11, wherein: the accessory controller is configured to perform asynchronous communication with the image-capturing apparatus; the accessory communicator is configured to provide three channels that are a communication request channel used for providing a communication request from the image-capturing apparatus to the accessory apparatus, and the first and second data communication channels; and the accessory controller is configured (a) to transmit, in response to receiving the communication request from the image-capturing apparatus through the communication request channel, the accessory data to the image-capturing apparatus through the first data communication channel, and (b) to receive the camera data transmitted from the image-capturing apparatus through the second data communication channel. ### Claim 17 (depends on 16) An accessory apparatus according to claim 16, wherein the accessory controller is configured (a) to transmit, in the first communication mode, the accessory data to which a communication standby request that requests prohibiting the image-capturing apparatus from providing the communication request is added, and (b) to transmit, in the second communication mode, the accessory data to which the communication standby request is not added while the communication request is provided from the image-capturing apparatus. ### Claim 18 (depends on 16) An accessory apparatus according to claim 16, wherein the accessory controller is configured to perform, in response to not receiving the communication request for a predetermined time from the image-capturing apparatus that detects in the first communication mode a difference in communication mode, a switching process that switches the communication mode of the accessory controller to the first communication mode. ### Claim 19 (depends on 11) An accessory apparatus according to claim 11, wherein the accessory controller is configured to transmit, in response to detecting abnormality of the camera data, the accessory data produced so as to cause the image-capturing apparatus to detect the parity error. ### Claim 20 An image-capturing system including an image-capturing apparatus and an accessory apparatus detachably attachable to the image-capturing apparatus, the system comprising: a camera communicator included in the image-capturing apparatus and an accessory communicator included in the accessory apparatus, the camera and accessory communicators being configured to provide therebetween, a first data communication channel used for transmitting accessory data from the accessory apparatus to the image-capturing apparatus, and a second data communication channel used for transmitting camera data from the image-capturing apparatus to the accessory apparatus; and a camera controller included in the image-capturing apparatus and an accessory controller included in the accessory apparatus, the camera and accessory controllers being configured to perform communication therebetween through the camera and accessory communicators, wherein: the camera and accessory controllers are configured to be capable of switching their communication modes between a first communication mode and a second communication mode; and the camera controller is configured to cause the accessory controller to transmit the accessory data whose settings of parity bits are different between in the first and second communication modes. ### Claim at position 21 21-24. (canceled)