A three-axis drive light-collection actuator and light-collection device with coils

Abstract

The invention relates to a light pickup actuator and a light pickup apparatus with a three-axis drive by use of coils. The invention comprises: a pair of magnet structures which are arranged on the right end and the left end and form the magnetic field flows of the closed circuit respectively; at least a first coil, which is positioned between the two magnet structures and mutually opposites to the magnet structures so as to enable the first coil within the magnetic field flows; at least a second coil, which is positioned between the two magnetic structures and mutually opposites to the magnet structures so as to enable the second coil within the magnetic field flows; the first coil and the second coil enable the current paths in the coils different from each other and the tracking driving force, the focusing driving force and the inclination driving force are generated with the electromagnetic force combination generated by the first coil and the second coil. The three-axis drive makes use of the coil combinations which can differentiate circuit structures to reflect the tracking, the focusing servo and the tilt compensation for tilting change and replaces the lateral wall of the field hood with the coil layering, so as to reduce the weight of the instrument, resulting in the promotion of the driving induction degree.

Description

technical field [0001] The present invention relates to an optical pick-up actuator, in particular to a three-axis drive that embodies tracking, focus servo and tilt compensation for skew changes, but effectively constitutes an electromagnetic circuit, improves the drive sensitivity, and reduces the use of the weight of the drive part The coil's three-axis drive pick-up actuator and pick-up equipment. Background technique [0002] In order to record information on an optical information storage medium—the optical disc, which stores information optically, or to play back the recorded information, an optical pickup that irradiates light of an appropriate wavelength to the optical disc to change or interpret the physical state of the internal tracks of the optical disc is required. [0003] The optical pickup is formed by concentrating the light generated by the light source onto the optical disc through the objective lens. At this time, the concentrated position of the light o...

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Problems solved by technology

In addition, the greater the distance between the coil and the magnet, the air-gap (air-gap), the lower the driving sensitivity of the light pickup actuator becomes, as described in Figure 2b As shown, the above-mentioned coil is constituted by a wire-wound coil as an example, because in order to ensure the space for the wire-wound coil coil, the thickness of the lens hood is more than a certain value, and the thickness difference of the guide part required for the coil of the bobbin, The space between the coil and the magnet exceeds a certain level, resulting in a decrease in sensitivity

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