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US 7,697,398 B2Granted
Optical pickup device having an electromechanical conversion element for recording and/ or reproducing information
AssigneeKonica Minolta Opto, Inc.
InventorKatsumi Fujiwara
Life of this patent
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Abstract
A piezoelectric element of a driving device is arranged on the opposite side of the light source, when an optical pickup device is divided by a plane that includes an optical axis of an objective lens and perpendicularly intersects the axis line of a light flux entering a raising mirror, that has come from the light source, whereby, it is possible to cause optical elements existing between the objective lens and the laser light source to be away from the piezoelectric element, and thereby to avoid an influence of heat even when a gap between members is reduced.
Claims12
An optical pickup device comprising:
- a light source;
- a reflective optical element;
- an objective lens;
- an electromechanical conversion element which repeatedly expands and contracts with different velocities between an expansion direction and a contraction direction;
- a driving device including a movable portion which moves in a predetermined direction according to a pattern of expansion and contraction of the electromechanical conversion element;
- and
- a movable optical element connected with the movable portion;
- wherein the optical pickup device conducts at least one of recording and reproduction of information by entering a light flux coming from the light source into the objective lens through the movable optical element and the reflective optical element and by focusing the light flux coming from the objective lens onto each information recording surface of various types of optical information recording media, and
- wherein when the optical pickup device is divided by a first plane which includes an optical axis of the objective lens and which is perpendicular to an axis of an incident light flux of the light flux coming from the light source, the incident light flux entering the reflective optical element, the electromechanical conversion element is positioned on an opposite side of the first plane with respect to the light source.
6 more elements
Dependencies are inferred from the claim text.