ELECTROMAGNETICALLY DRIVEN SHUTTER IN CAMERA

摘要

PURPOSE:To simplify mechanism and to permit easy handling by driving all the operations for focusing and exposure adjustment by means of a single electromagnetic driving member. CONSTITUTION:A stop motor 3 is turned and a driving plate 1 and an interlocking plate 2 are run toward the right when a release member is pushed down. An excited electromagnet 7e attracts simultaneously an electromagnet 7c and holds a focusing control lever 7 in the position where said lever does not contact with a detaining tooth part 2c. A light emitting element 6a irradiates impulsive light toward a subject at the arm end of a scanning lever 6. On the other hand, a bisected sensor 8 detects the impulsive light of the element 6a as the light reflected from the subject and outputs a focusing signal at the point of the time when the outputs from the two sensors coincide. The result of the measurement is displayed in a finder and the conduction of electricity to the electromagnet 7e is interrupted. The lever 7 released from the attraction is turned toward the right by the energizing force of the spring 7a to engage the claw 7d with the part 2c, thereby stopping the running of the plate 2. A distance ring 9 is further detained via a pin 2d to stop a photographing lens in the focusing position.