| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve an opening/closing of a variable diaphragm, gradually changing of an aperture diameter, the miniaturization of a lens barrel, the structural simplification and the reduction of the number of components without using variable diaphragm driving means such as an actuator. <P>SOLUTION: A first inclined part 20a for contacting to a first inclined receiving part 12b of a rotation member 12 is attached on the outer peripheral part of a first lens holding frame 20. A projection part 30c is penetrated into a coil-shaped optical axis energizing spring 11b and inserted into a hole 11a formed on a base member 11, so that a second lens holding frame 30 can move to the direction along an optical axis integrally with the variable diaphragm 10. On the side face of a linear guide ring 40, a guide groove 40a is formed to slide the second lens holding frame 30 to the direction along the optical axis in the linear guide ring 40 by fitting with a pawl part 30b of the second lens holding frame 30. On the inner peripheral surface of the linear guide ring 40, a second inclined part 40b for contacting to a second inclined receiving part 12a of the rotation member 12 is formed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
