Image capture device with zoom lens

1. An image capture device, comprising:

a zoom lens provided to a device body through a zoom mechanism, the zoom lens being caused by the operation of the zoom mechanism to move back and forth along the optical axis of the zoom lens, the zoom mechanism includes a lens barrel to which the zoom lens is fixed;

an information acquisition part which acquires information about the amount of movement determined by the amount of movement of the zoom lens;

a power supply part which supplies power to the information acquisition part;

an operational part which gives instructions to operate the zoom mechanism;

a first controller which controls the operation of the zoom mechanism;

a second controller which controls power supply from the power supply part to the information acquisition part; and

a state detection part which detects a specific halt state in which the zoom mechanism stops the movement of the zoom lens when the zoom mechanism is in any one of a plurality of predetermined operating positions, wherein each of the predetermined operating positions being such that the zoom lens hardly changes its position despite the action of external force,

wherein the first controller being adapted to move the zoom mechanism to a predetermined rest position that is closest to the zoom lens, when the operational part gives an instruction to stop the zoom mechanism, and

wherein the second controller being adapted to stop power supply from the power supply part to the information acquisition part in the process of transferring the zoom lens along the optical axis when the state detection part detects the specific halt state, when the predetermined rest position is one of the predetermined operating positions.

2. The image capture device according to claim 1 , wherein

the state detection part includes:

a storage part containing position information stored in advance therein, the position information indicating the position of the zoom lens when the zoom mechanism is in the predetermined operating position; and

a determination part which determines whether or not the zoom mechanism has reached the predetermined operating position based on the information about the amount of movement acquired from the information acquisition part and the position information stored in the storage part, the determination being made when the operational part gives instructions to stop the operation of the zoom mechanism, and

when the determination part determines that the zoom mechanism has reached the predetermined operating position, the state detection part detects this state as the specific halt state.

3. The image capture device according to claim 1 , wherein

the lens barrel being capable of rotating about the optical axis of the zoom lens while being capable of moving back and forth along the optical axis, and

the device body and the lens barrel are coupled to each other by a cam mechanism, the cam mechanism having a cam curve that defines the change of the operating position of the zoom mechanism determined by the amount of rotation of the lens barrel about the optical axis.

4. The image capture device according to claim 1 , wherein

the controller stops power supply from the power supply part to the information acquisition part when the zoom lens has reached at least a wide end or a telephoto end.

5. The image capture device according to claim 1 , wherein

the zoom lens is caused to move back and forth along the optical axis of the zoom lens by driving of a motor, and

the information acquisition part includes a pulse encoder for acquiring the number of pulses determined by the amount of rotation of the motor, the acquired number of pulses serving as the information about the amount of movement.