| 摘要 |
PURPOSE: An optical element retracting mechanism for a photographing lens is provided to retract an optical element of a photographing optical system to a position deviating from a photographing optical axis of the photographing optical system, and at the same time, retract the optical element toward a picture plane with a high degree of accuracy. CONSTITUTION: The front eccentric pin(34X-b) and the rear eccentric pin(34X-c) have the common axis eccentric to the axis of the large diameter portion(34X-a) as mentioned above. Therefore, a rotation of the first eccentric shaft on the adjustment axis PX causes the front and rear eccentric pins(34X-b) to revolve about the adjustment axis PX, i.e., rotate in a circle about the adjustment axis PX, thus causing the front eccentric pin(34X-b) to push the front second lens frame support plate(36) in the X-direction while moving in the Y-direction and at the same time causing the rear eccentric pin to push the rear second lens frame support plate in the X-direction while moving in the Y-direction. At this time, although the front eccentric pin(34Y-b) and the rear eccentric pin are respectively movable in the horizontally-elongated hole(36e) and the horizontally-elongated hole in the X-direction, the front second lens frame support plate(36) swings about a fluctuating axis extending substantially parallel to the common axis of the front and rear bosses in the vicinity of this common axis since the second vertically-elongated hole(36f) is immovable in the X-direction relative to the front boss(8j) and at the same time the rear second lens frame support plate swings about the fluctuating axis since the second vertically-elongated hole is immovable in the X-direction relative to the rear boss. The position of the fluctuating axis corresponds to the following two resultant positions: a front resultant position between the position of the horizontally-elongated hole(36e) relative to the front eccentric pin(34Y-b) and the position of the second vertically-elongated hole(36f) relative to the front boss(8j), and a rear resultant position between the position of the horizontally-elongated hole relative to the rear eccentric pin(34Y-b) and the position of the second vertically-elongated hole relative to the rear boss.
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