IMAGING LENS DEVICE

PROBLEM TO BE SOLVED: To reduce the size of an imaging lens device by decreasing the number of its components. SOLUTION: The imaging lens device includes: a lens barrel incorporating a lens; a holder 5 supporting the lens barrel 4 so that the lens barrel 4 is movable in the direction of an optical axis; and a cam mechanism 6 adjusting the position of the lens barrel 4 in a plurality of steps in the direction of the optical axis. The lens barrel 4 has: a lens barrel 9 supporting the lens inside; an adjustment ring 10 integrally attached to the lens barrel 9; and cam pins 14 projecting from the periphery of the adjustment ring 10. The holder 5 has: a lens barrel support cylindrical part 17 supporting the lens barrel 4 so as to allow its movement in the direction of the optical axis and its rotation around the optical axis; and cam grooves 19, which are formed in the lens barrel support cylindrical part 17, into which the cam pins 14 of the lens barrel 4 fit, and which adjust the position of the lens barrel 4 in the direction of the optical axis by the slide of the cam pins 14 resulting from the rotation of the lens barrel 4. A backlash prevention spring 7 is disposed between the lens barrel 4 and the holder 5. The backlash prevention spring 7 presses the lens barrel 4 supported in the holder 5, in order to restrain backlash caused by the movement of the lens barrel 4 in the direction of the optical axis and the rotation of the lens barrel 4 around the optical axis. COPYRIGHT: (C)2006,JPO&NCIPI