Abstract: In an optical apparatus having a group of contacts for electrical connection with another apparatus, a plurality of contacts for communication are disposed between a power-supply contact and a grounding contact; the power-supply and grounding contacts are spaced at a larger distance away from adjoining communication contacts than the spacing distance provided between communication contacts; the group of contacts are electrically connected by spring members to patterns formed on a contact substrate; and the width of patterns provided for the power-supply and grounding contacts is arranged to be wider than the width of patterns for the communication contacts.

Abstract: In a camera system comprising a camera body and an optical accessory which can be detachably coupled with each other through their mounts by rotating around an optical axis, mutually corresponding groups of electric connection terminals including power-supply and power-supply receiving terminals are aligned around the optical axis on the camera body and the optical accessory and arranged to come into contact with each other when the two mounts are coupled, a protruding part is formed close to the connection terminals of the camera body to protrude further than them in their contacting direction; and a cutout part is formed close to the electric connection terminals of the optical accessory in their contacting direction in a position corresponding to the protruding part of the camera body when the two mounts are coupled with each other.

Abstract: In an optical apparatus having a group of contacts for electrical connection with another apparatus, a plurality of contacts for communication are disposed between a power-supply contact and a grounding contact; the power-supply and grounding contacts are spaced at a larger distance away from adjoining communication contacts than the spacing distance provided between communication contacts; the group of contacts are electrically connected by spring members to patterns formed on a contact substrate; and the width of patterns provided for the power-supply and grounding contacts is arranged to be wider than the width of patterns for the communication contacts.

Abstract: In a camera system comprising a camera body and an optical accessory which can be detachably coupled with each other through their mounts by rotating around an optical axis, mutually corresponding groups of electric connection terminals including power-supply and power-supply receiving terminals are aligned around the optical axis on the camera body and the optical accessory and arranged to come into contact with each other when the two mounts are coupled, a protruding part is formed close to the connection terminals of the camera body to protrude further than them in their contacting direction; and a cutout part is formed close to the electric connection terminals of the optical accessory in their contacting direction in a position corresponding to the protruding part of the camera body when the two mounts are coupled with each other.

Abstract: In a lens barrel having an electromechanical transducer for driving an iris mechanism, a zooming motor for driving a zoom mechanism and focusing motor for driving a focusing mechanism, at least one of the zooming motor and the focusing motor is arranged to be a geared motor in which a motor part and a reduction gear part are interconnected in the direction of an output shaft; and the motor part of the geared motor is disposed in front of the reduction gear part as viewed in the direction of the optical axis of the lens barrel.

Abstract: A camera system comprises a camera body and an optical accessory which are detachably coupled with each other through their mounts by rotating them around an optical axis relative to each other. Each of the camera body and the optical accessory has a group of electric connection terminals. Each group is aligned approximately around the optical axis and arranged to come into contact with the other group when the mounts are coupled with each other by rotating them. The height in their contacting direction of each group of terminals is arranged to have a stepped difference at least by one step. At least one of the two groups of connection terminals is arranged to be movable in the contacting direction and to be elastically urged to move in that direction. Among each of said groups of connection terminals, a plurality of power supply connection terminals are disposed away from each other with other connection terminals which are provided for data communication disposed between the power supply terminals.