| 摘要 |
PURPOSE:To allow a mechanism to carry out a simple initial adjustment by adjusting the infinitive distance focus, exposure operation, etc., of a lens being manufactured by means of electronic control. CONSTITUTION:A gear 1 rotates in the clockwise direction and inverts, and when the gear 1 rotated in the counterclockwise direction for rough pulse amount measured and calculated by a range-finding device 105, the gear 1 rotates again in the clockwise direction for a micro amount. Thus, a ratchet claw member 7 is locked with a tooth 3g, for example, and the further rotation of a ratchet wheel 3 is hindered, and the infinitive focusing of the lens is completed. At this time, since the turning on/off conditions of switches 108 and 109 are input to a motor control signal generating circuit 101 from a condition setting circuit 113, the circuit 101 corrects the rough pulse number by adding a certain number of pulse according to the condition, and outputs it. Thus, the claw 7 is dropped to a ratchet claw which is at the most suitable position for the lens focusing. Then, the automatic exposure control operation is carried out so as to return to the initial position. |
