| 摘要 |
PURPOSE:To correct mechanically and automatically the temperature variation of a focusing position, by making the time required for actuating a detaining means which detains a moving means after receiving a signal sent from a detecting means which detects the object distance variable in accordance with the ambient temperature. CONSTITUTION:The deviation in focus caused by temperature in a photographing lens system using partially a formed lens having large temperature change of refractive index in an autofocus type camera is corrected, and a stop lever 12 which can be engaged with a distance ring 2 is energized counterclockwise by a plate spring 13 having a bimetal structure made of two kinds of metallic plates. When the ambient temperature changes, for example, decreases, the actuating time of the stop lever 12, namely, the inhibiting force to the stop lever 12 generated by a shutter set plate is released and the time required for engaging the pawl part 12b of the stop lever 12 with the pawl part 2c of the distance ring 2 by the force of the plate spring 13 is shortened and the pawl part 12b is detained with the tooth 2c2 at this side of the tooth 2c1 of the pawl part 2c. |
