| 摘要 |
PROBLEM TO BE SOLVED: To detect the temperature of a lens system without providing a dedicated sensor and to change driving torque in accordance with various temperature conditions by providing a driving torque changing means for changing the driving torque of a lens position driving means based on the detected temperature of the lens system. SOLUTION: The temperature of the lens system 1 is detected based on output voltage from a Hall element 6 at the fixed position of a diaphragm 2, which is detected by an output voltage detection means. Next, the driving torque optimum to drive a focusing motor 10 is obtained by a CPU 17 having a table showing the driving torque corresponding to the detected temperature of the lens system 1 under the temperature condition of the detected temperature based on the table. Then, it is outputted as a TS signal to a motor driving torque setting circuit 16. The circuit 16 sets the driving torque for driving the motor 10 in accordance with the TS signal. Thus, the image pickup device is miniaturized and the cost is reduced.
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