# US 2019/0377243 A1 · Accessory 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 2019/0377243 A1 - Document ID: US20190377243A1 - Status: Published application - Kind: A1 - Application number: 16/429,404 - Filed: 2019-06-03 - Published: 2019-12-12 - Earliest claimed: 2018-06-06 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yuki Chishima; Fumihiko Aikawa - Web page: https://patentgrep.com/patent/US20190377243A1 ## CPC - G03B 17/14: interchangeably - G03B 17/56: Accessories (carrying-cases A45C11/38) - H04N 23/51: Housings - H04N 23/54: Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils - G03B 2206/00: Systems for exchange of information between different pieces of apparatus, e.g. for exchanging trimming information, for photo finishing - 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 ## Abstract An accessory attachable to and detachable from an image pickup apparatus includes a first connector connectable to the image pickup apparatus, a second connector connectable to the image pickup apparatus, and an accessory controller configured to communicate with the image pickup apparatus. The accessory controller, in an initial setting after the accessory is attached to the image pickup apparatus, sends a first detection signal to the image pickup apparatus via the first connector and receives, in response to a second detection signal for detecting that the second connector is attached to the image pickup apparatus, a third detection signal from the image pickup apparatus via the second connector. ## Claims ### Claim 1 An accessory attachable to and detachable from an image pickup apparatus, the accessory comprising: a first connector connectable to the image pickup apparatus; a second connector connectable to the image pickup apparatus; and an accessory controller configured to communicate with the image pickup apparatus, wherein the accessory controller, in an initial setting after the accessory is attached to the image pickup apparatus, sends a first detection signal to the image pickup apparatus via the first connector and receives, in response to a second detection signal for detecting that the second connector is attached to the image pickup apparatus, a third detection signal from the image pickup apparatus via the second connector. ### Claim 2 (depends on 1) The accessory according to claim 1, wherein the accessory controller determines that the accessory is normally attached to the image pickup apparatus when receiving the third detection signal, and that the accessory is not normally attached to the image pickup apparatus when not receiving the third detection signal. ### Claim 3 (depends on 2) The accessory according to claim 2, wherein the accessory controller issues a notice of an abnormal state when the accessory controller does not receive the third detection signal and when a battery power inserted in the accessory is consumed by a predetermined value or more. ### Claim 4 (depends on 1) The accessory according to claim 1, wherein the accessory controller determines that the accessory controller receives the third detection signal when the third detection signal has a low level, and that the accessory controller does not receive the third detection signal when the third detection signal has a high level. ### Claim 5 (depends on 1) The accessory according to claim 1, wherein the first connector includes a terminal configured to communicate a first communication signal between a battery inserted in the accessory and the image pickup apparatus, and wherein the accessory controller sends the first detection signal to the image pickup apparatus via the terminal in the initial setting. ### Claim 6 (depends on 5) The accessory according to claim 5, wherein the accessory controller sends the first detection signal corresponding to the first communication signal having a predetermined level when the battery is inserted into the accessory and a battery lid of the accessory is closed. ### Claim 7 (depends on 6) The accessory according to claim 6, wherein the accessory controller sets a first ON signal to a high level, turns on a first switch, and sets the first communication signal to a low level, when the battery is inserted into the accessory and the battery lid is closed. ### Claim 8 (depends on 7) The accessory according to claim 7, wherein the accessory controller communicates a second communication signal with the battery by switching a second switch after setting the first communication signal to the low level. ### Claim 9 (depends on 8) The accessory according to claim 8, wherein the accessory controller controls the second switch so as to enable a communication between the image pickup apparatus and the battery when the accessory controller receives the third detection signal and a communication of the second communication signal is completed. ### Claim 10 (depends on 1) The accessory according to claim 1, wherein when the accessory is attached to the image pickup apparatus, the first connector is attached to the image pickup apparatus and then the second connector is attached to the image pickup apparatus. ### Claim 11 (depends on 1) The accessory according to claim 1, wherein the accessory is a battery grip that includes a body portion into which a battery is inserted, and a protrusion portion attachable to a battery compartment in the image pickup apparatus, and wherein the first connector is provided to the protrusion portion, and the second connector is provided to the body. ### Claim 12 An image pickup apparatus to which an accessory is detachably attachable, the image pickup apparatus comprising: a first connector connectable to the accessory; a second connector connectable to the accessory; and a camera controller communicating with the accessory, wherein the camera controller, in an initial setting after the accessory is attached to the image pickup apparatus, receives a first detection signal from the accessory via the first connector, receives a second detection signal when the second connector is attached to the accessory, and sends a third detection signal through the second connector after receiving the first detection signal and the second detection signal. ### Claim 13 (depends on 12) The image pickup apparatus according to claim 12, wherein the camera controller determines that the accessory is normally attached to the image pickup apparatus when receiving the first and second detection signals, and determines that the accessory is not normally attached to the image pickup apparatus when not receiving at least one of the first and second detection signals. ### Claim 14 (depends on 12) The image pickup apparatus according to claim 12, wherein the camera controller issues a notice of an abnormal state when not receiving the second detection signal for a predetermined time after receiving the first detection signal. ### Claim 15 (depends on 12) The image pickup apparatus according to claim 12, wherein the first connector includes a terminal configured to communicate a first communication signal between a battery inserted in the accessory and the image pickup apparatus, and wherein the camera controller receives the first detection signal from the accessory via the terminal in the initial setting. ### Claim 16 (depends on 12) The image pickup apparatus according to claim 12, wherein the camera controller receives the first detection signal corresponding to the first communication signal having a predetermined level when the accessory is attached to the image pickup apparatus via the first connector. ### Claim 17 (depends on 16) The image pickup apparatus according to claim 16, wherein the first detection signal corresponds to the first communication signal having a low level.