Patent ID: 6972404
Filing Date: 2005-12-06
Classification: G11B

Abstract:
1. An optical control device for controlling movement of a driven member along a first track, said optical control device comprising: a drive unit including a drive member that is disposed to be movable along a second track and that is adapted to be coupled to the driven member for driving the driven member to move along the first track, said drive member having a first surface formed with a plurality of reflecting regions which are disposed along the second track and which have different light reflecting responses to a same light signal; an optical unit disposed adjacent to said drive member, said optical unit including a light emitter for emitting a light beam that is incident upon an aligned one of said reflecting regions on said first surface of said drive member during movement of said drive member along the second track, and a light receiver for receiving a light beam that was reflected by said aligned one of said reflecting regions on said first surface of said drive member, said light receiver generating an electrical output corresponding to the light beam received thereby; and a controller coupled electrically to said optical unit and said drive unit, said controller determining actual position of said drive member on the second track according to the electrical output of said light receiver and further determining actual position of the driven member on the first track according to the actual position of said drive member on the second track, said controller being adapted to receive a control input corresponding to a desired position of the driven member on the first track, and controlling said drive unit in response to the control input for moving said drive member along the second track so as to dispose the driven member at the desired position on the first track,