Patent ID: 8451552
Filing Date: 2013-05-28
Classification: G02B

Abstract:
1. A lens driving device comprising: a holding member adapted to hold an image pickup element; a lens holding member adapted to hold a photographic lens; a lead screw adapted to move said lens holding member forward and backward in a photographic optical axis direction; and a first support member and a second support member adapted to rotationally support said lead screw, wherein said first support member is integrally formed in said holding member, one end side of said lead screw being supported by the first support member and the second support member, and other end side of said lead screw being unsupported, said second support member has a support concave portion having an apex for supporting said lead screw, and said lead screw has a support portion that is in point contact with the support concave portion having the apex, wherein the support concave portion having the apex and the support portion respectively have spherical portions in the vicinity of the portions in point contact with each other, and the spherical portion formed in the support portion has a smaller diameter than the spherical portion formed in the support concave portion having the apex, and wherein the support portion further has a first conical portion formed on an end of said lead screw, wherein the spherical portion continues from a tangent line of the first conical portion, and the support concave portion having the apex further has a second conical portion with a more obtuse angle than the first conical portion formed in the support portion, wherein the spherical portion continues from a tangent line of the second conical portion.