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US 2009/0288510 A1Published application
Actuator for displacement of a holder against a homing-position
AssigneeKoninklijke Philips Electronics N.V.
InventorsAndre Latenstein Van Voorst, Libert Henricus Augustinus Maria Camps, Johannes Antonius Van Rooij
Life of this patent
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Abstract
A lead screw actuator for displacing holder with a collimator lens in an optical scanning device has a home-position for accurately determining the position of the collimator lens. An anti-seize construction is provided to avoid the holder to get stuck against the home-position due to the friction between both surfaces.
Claims11
An actuator for displacement of a holder (9, 21) along a displacement axis (22), comprising
- a driving means (24) for driving a lead screw,
- the lead screw (25) having a thread (25A) with a pitch and a pitch angle,
- the holder (9, 21) having a thread arranged to cooperate with the lead screw for the displacements of the holder, the holder having a reference-surface (26),
- a home-position (27) having a stopping-surface (27A) for stopping the displacement of the holder when the reference-surface of the holder contacts the stopping-surface,
- characterized in that at least one of said stopping-surface and reference-surface is making a sharp angle with a plane perpendicular to the displacement axis of the holder and having the same direction as the pitch angle of the lead screw.
2 more elements
Dependencies are inferred from the claim text.