| 摘要 |
PROBLEM TO BE SOLVED: To obtain a zoom lens device where a foremost lens group is made to retreat further by releasing predetermined positionalal relation between a rearmost lens group and the foremost lens group when collapsing, and where a press-contact receiving surface is formed of a large conical recessed surface in a lens holding frame performing the positioning and the adjustment of posture of the rearmost lens group in cooperation with the lens frame of the rearmost lens group and a press-contact positioning surface is formed of a small conical projecting surface in the lens frame, and the positioning and the adjustment of posture thereof are performed by making them press-contact by linear contact. SOLUTION: The lens frame 30 of the 3rd group lens 3 and the lens holding frame 20 provided in a moving lens barrel 18 holding the first group lens 1 are linked in a state where the press-contact receiving surface 22 formed of the large conical recessed surface whose apex exists on an optical axis S in the frame 20 is made to press-contact with the press-contact positioning surface 32 formed of the small conical projecting surface whose apex exists on a line parallel with the optical axis S and whose apex angle is equal to that of the large conical recessed surface in the frame 30. They are made to press-contact by the biasing force of a tension spring 4 laid over a spring bracket 31 provided to be extended forward in the frame 30 and the frame 20. COPYRIGHT: (C)2004,JPO&NCIPI
|
