JP2009134249A5 - - Google Patents

Claims (12)

A holding member for holding an optical element constituting the optical system ;
An advancing / retreating guide member that supports the holding member so as to be movable in an optical axis direction passing through the optical element;
A biasing force in a moving direction guided by the advance / retreat guide member with respect to the holding member and swingable in the optical axis direction in an applied state engaging with the holding member, and a direction orthogonal to the moving direction and biasing means at the same time to impart a biasing force to the,
A ring surrounding the optical axis and rotating at least one optical element constituting the optical system in the optical axis direction by rotation;
Equipped with a,
An optical element position control mechanism characterized in that the urging means is located radially outside the rotating ring . 2. The optical element position control mechanism according to claim 1, wherein the biasing unit is a coil portion supported by a support member different from the holding member with an axis line oriented in a direction orthogonal to the optical axis direction, and the coil A first arm portion extending from the portion toward the outer diameter direction and engaging with the holding member; and a second arm portion extending from the coil portion toward the outer diameter direction and engaged with the support member. And a spring member that changes the amount of bending in the rotational direction around the coil portion according to the movement of the holding member, and the first arm portion of the spring member is free to engage with the holding member. An optical element position control mechanism that is positioned outside the rocking surface defined by the rocking movement and is elastically deformed in a direction approaching the rocking surface when it is in a state of being applied to the holding member. 2. The optical element position control mechanism according to claim 1, wherein the urging means has one end portion pivotally supported by a support member different from the holding member and the other end portion engaged with the holding member, and the swing center. In a free state where the lever member is not engaged with the holding member, the lever member is biased in either the forward or reverse rotational direction to the outside of the swing surface defined by the swing. An optical element position control mechanism that is positioned and elastically deformed in a direction approaching the rocking surface when the holding member is in an applied state. 4. The optical element position control mechanism according to claim 1, wherein the advance / retreat guide member is a guide shaft whose axis is directed in the optical axis direction, and the holding member is slidable on the guide shaft. An optical element position control mechanism that has a guide hole to be inserted, and the urging means presses the inner wall of the guide hole of the holding member against the guide shaft by abutting against a contact portion in the vicinity of the guide hole. 5. The optical element position control mechanism according to claim 4, wherein the holding member protrudes from an abutting portion in the vicinity of the guide hole and is positioned on an extension of the swinging direction of the biasing member to generate a biasing force in the moving direction. An optical element position control mechanism having a receiving projection. The optical element position control mechanism according to any one of claims 1 to 5, further comprising: a pressing unit that presses the biasing unit in a direction perpendicular to a moving direction of the holding member in an applied state to the holding member. An optical element position control mechanism. 7. The optical element position control mechanism according to claim 6, wherein the pressing means has a fixed wall member positioned on at least one of the outer side and the inner side of the biasing means, and the biasing means contacts the fixed wall member. An optical element position control mechanism that contacts and is pressed in a direction orthogonal to the moving direction of the holding member. 8. The optical element position control mechanism according to claim 7, wherein the fixed wall member comprises an outer wall member positioned outside the biasing means, and presses the biasing means in a direction approaching the optical axis. mechanism. 8. The optical element position control mechanism according to claim 7, wherein the fixed wall member is an inner wall member positioned inside the biasing means, and presses the biasing means in a direction away from the optical axis. mechanism. 10. The optical element position control mechanism according to claim 7, wherein the fixed wall member has a projecting pressing portion that comes into contact with the urging means. 11. 11. The optical element position control mechanism according to claim 7, wherein the urging means has a bent shape that is convex toward the fixed wall member, and the bent portion contacts the fixed wall member. Optical element position control mechanism in contact. The optical element position control mechanism according to claim 6, further comprising: an inner cylindrical member positioned outside the holding member; and an outer wall member facing the outer surface of the inner cylindrical member;
The urging means is held between the inner cylindrical member and the outer wall member, and abuts against either the inner cylindrical member or the outer wall member and is pressed in a direction orthogonal to the moving direction of the holding member. Optical element position control mechanism.