Imaging apparatus and accessory

An imaging apparatus comprising:

• a mount apparatus, wherein the mount apparatus includes,
• a mount portion,
• a plurality of claw portions to be used for coupling by a bayonet coupling method,
• a plurality of terminals that are disposed following a circumferential direction of the mount portion, and that are used for electrical connection,
• a holding member configured to hold the plurality of terminals, and
• a biasing unit configured to bias another claw portion which is engaged with a first claw portion of the plurality of claw portions in a direction parallel to a center axis of the mount portion,
• wherein the holding member has a first tier and a second tier, where positions of holding the plurality of terminals differ in the direction parallel to the center axis,
• wherein, among the plurality of terminals, the number of terminals held at the first tier is greater than the number of terminals held at the second tier,
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion, the biasing unit is located along the first claw portion of the mount portion, within an angle range in the circumferential direction of the mount portion,
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion, among the plurality of terminals on the first tier, a first terminal included in the plurality of terminals on the first tier is disposed further from the second tier than other terminals on the first tier, and
• wherein an angle range where the first terminal has been disposed overlaps an angle range where the biasing unit has been disposed in the circumferential direction of the mount portion.

An adapter device comprising:

• a mount apparatus, wherein the mount apparatus includes,
• a mount portion,
• a plurality of claw portions to be used for coupling by a bayonet coupling method,
• a plurality of terminals that are disposed following a circumferential direction of the mount portion, and that are used for electrical connection,
• a holding member configured to hold the plurality of terminals, and
• a biasing unit configured to bias another claw portion which is engaged with a first claw portion of the plurality of claw portions in a direction parallel to a center axis of the mount portion,
• wherein the holding member has a first tier and a second tier, where positions of holding the plurality of terminals differ in the direction parallel to the center axis,
• wherein, among the plurality of terminals, the number of terminals held at the first tier is greater than the number of terminals held at the second tier,
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion, the biasing unit is located along the first claw portion of the mount portion, within an angle range in the circumferential direction of the mount portion,
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion, among the plurality of terminals on the first tier, a first terminal included in the plurality of terminals on the first tier is disposed further from the second tier than other terminals on the first tier,
• wherein an angle range where the first terminal has been disposed overlaps an angle range where the biasing unit has been disposed in the circumferential direction of the mount portion, and
• wherein the mount apparatus is provided on one side of an adapter device.

An accessory detachably mountable on a mount apparatus, comprising:

• a mount portion;
• a plurality of claw portions to be used for coupling by a bayonet coupling method;
• a plurality of terminals that are disposed following a circumferential direction of the mount portion, and that are used for electrical connection;
• and
• a holding member configured to hold the plurality of terminals,
• wherein the holding member has a first tier and a second tier, where positions of holding the plurality of terminals differ in a direction parallel to a center axis of the mount portion,
• wherein, among the plurality of terminals, the number of terminals held at the first tier is greater than the number of terminals held at the second tier,
• wherein, among the plurality of terminals on the first tier, a first terminal is disposed further from the second tier than the other terminals on the first tier,
• wherein, in a state where the accessory is mounted on the mount apparatus, the first terminal is electrically connected with a second terminal of the mount apparatus, and
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion in a state where the accessory is mounted on the mount apparatus, an angle range where the first terminal has been disposed overlaps an angle range where a biasing unit of the mount apparatus has been disposed that is biasing a first claw portion of the plurality of claw portions in the direction parallel to the center axis of the mount portion in the circumferential direction of the mount portion.

A mount apparatus to which an accessory is detachably attached, the mount apparatus comprising:

• a mount portion;
• a plurality of claw portions;
• a plurality of terminals that are used for electrical connection to a plurality of terminals which are provided on the accessory;
• and
• a biasing unit configured to bias one of claw portion of a plurality of claw portions of the accessory which is engaged with a first claw portion of the plurality of claw portions in a direction parallel to a center axis of the mount portion,
• wherein the plurality of terminals of the mount apparatus includes a first terminal of which a number of times coming into contact with a plurality of terminals of the accessory is greater than other terminals of the mount apparatus, and
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion, an angle range where the first terminal has been disposed overlaps an angle range where the biasing unit has been disposed in the circumferential direction of the mount portion.

An accessory detachable from and attached to a mount apparatus, the accessory comprising:

• a mount portion;
• a plurality of claw portions;
• and
• a plurality of terminals that are used for electrical connection to a plurality of terminals which are provided on the mount apparatus;
• wherein the plurality of terminals of the accessory includes a first terminal of which a number of times coming into contact with a plurality of terminals of the mount apparatus is smaller than other terminals of the accessory apparatus,
• wherein the mount apparatus includes a biasing unit configured to bias a first claw portion of the plurality of claw portions in a direction parallel to a center axis of the mount portion, and
• wherein, in a case of viewing the mount portion from the direction parallel to the center axis of the mount portion in a state where the accessory is mounted on the mount apparatus, an angle range where the first terminal has been disposed overlaps an angle range where the biasing unit has been disposed in the circumferential direction of the mount portion.