| 摘要 |
PURPOSE:To correct the pint of a lens device incapable of changing an imaging position even at the time of the generation of a temperature change. CONSTITUTION:A relay lens 2a is used as a focus correcting lens, the temperature in a lens camera cone 1 is detected by a temperature sensor 5, and the detected temperature signal is inputted to a correction amount arithmetic circuit 11. The position of the relay lens 2a in the temperature state is detected by a corrected data setting means 12 at which data concerned with the position of the relay lens 2a for holding the imaging position to be constant according to the temperature change are set, and compared with a signal concerned with the present lens position from a lens position detecting means 4 by a comparing means 13, so that the moving direction and moving amounts of the relay lens 2a can be calculated. Then, the signal is inputted to a lens driving circuit 14 which controls the operation of a motor 3, the motor 3 is operated, and the relay lens 2a is moved to the focusing position in the pertinent temperature state. |
