Patent ID: 7017541

Claim:
A driving apparatus adjusting a control amount of a controlled part based on an axial position of a control axis member, comprising: a driving cam including a circular surface portion and a non-circular surface portion, the circular surface portion having a constant radius over a predetermined circumferential length of an outer cam surface, the driving cam rotating with a cam shaft member by a driving force received from a power source; a control axis member substantially perpendicular to a rotational axis of the cam shaft member, the control axis member reciprocating in a direction substantially perpendicular to the rotational axis of the cam shaft member along a profile of the outer cam surface while the driving cam rotates; and a transfer portion disposed at one end of the control axis member, having a contact portion being in contact with the driving cam, and converting a rotational motion of the driving cam into a reciprocating motion which is transferred to the control axis member, wherein a radial distance between a center of the camshaft and the circular surface portion is longer than a radial distance between the center of the cam shaft and the non-circular surface portion.