Patent ID: 7936525
Filing Date: 2011-05-03
Classification: F16H,G02B,G03B

Abstract:
1. A driving apparatus, comprising: a lead screw rotating about a rotational axis line to transfer a driving force; a first tooth disposed to face a first circumferential portion of the lead screw; a second tooth disposed to face a second circumferential portion of the lead screw, the second circumferential portion being opposite to the first circumferential portion with respect to the rotational axis line of the lead screw, such that the first tooth and the second tooth are opposite to each other; a third tooth disposed to face a third circumferential portion of the lead screw, a diameter passing through the third circumferential portion being oriented perpendicular to a diameter passing through the first circumferential portion and the second circumferential portion; a follower section holding a driven member and moving when the follower section is driven by the rotation of the lead screw; and a biasing member biasing the first tooth such that the first tooth approaches the lead screw, wherein the first tooth engages with the lead screw so as to receive the driving force from the lead screw, when the follower section moves due to the rotation of the lead screw.