1. A manufacturing method for a variable capacitor, comprising:
forming a first element of which a capacitance value depends on a voltage applied to both of two terminals of a first area on a substrate;
forming a second element having a capacitance value fixed to a second area on the substrate adjacent to the first area; and
forming metallic wires for connecting the first element and the second element and connecting the first element and the second element with the outside.
2. The method of claim 1, wherein the first element is a bipolar transistor.
3. The method of claim 2, wherein the bipolar transistor includes a diode.
4. The method of claim 1, wherein the second element is a capacitor including a dielectric.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An apparatus for laser positioning in an optical disc drive, comprising:
a first positioning assembly that positions a first laser beam generated by a first laser and directed toward a first side of an optical disc site in the optical disc drive; and
a second positioning assembly that positions a second laser beam generated by a second laser and directed toward a second side of the optical disc site in the optical disc drive, the second positioning assembly positioning the second laser beam independent of the positioning of first laser beam by the first positioning assembly the second positioning assembly further comprising an actuator that positions the second laser beam, and an elastic member that opposes a movement of the actuator.
2. The apparatus of claim 1, wherein the first positioning assembly further comprises a screw drive system that moves a laser head, wherein the first laser is located in the laser head.
3. The apparatus of claim 1, wherein the actuator further comprises a solenoid.
4. The apparatus of claim 3 wherein a displacement of the solenoid is proportional to a current applied to the solenoid.
5. The apparatus of claim 1, wherein the actuator further comprises a voice coil motor.
6. The apparatus of claim 1, wherein the elastic member further comprises a spring.
7. The apparatus of claim 1, wherein the elastic member further comprises an elastic material.
8. The apparatus of claim 1, the second positioning assembly further comprises:
a laser head, wherein the second laser is located in the laser head;
guiding structure facilitating a linear movement of the laser head; and
wherein both the elastic member and the actuator are coupled to the laser head.
9. The apparatus of claim 8, wherein the guiding structure further comprises at least one rail, wherein the laser head slides along the at least one rail.
10. The apparatus of claim 1, the second positioning assembly further comprises:
an arm that pivots about a pivot point, wherein a pivotal movement of the arm positions the second laser beam along an arcuate path;
wherein both the elastic member and the actuator are coupled to the arm, wherein the actuator positions the second laser beam by causing the pivotal movement of the arm.
11. The apparatus of claim 1, further comprising a controller operatively coupled to the second positioning assembly, the controller executing a calibration routine to calibrate a positioning of the second laser beam.
12. A method for laser positioning in an optical disc drive, comprising the steps of:
positioning a first laser beam generated by a first laser and directed toward a first side of an optical disc in the optical disc drive to read data from or write data to an optical disc; and
positioning a second laser beam generated by a second laser and directed toward a second side of the optical disc in the optical disc drive independent of the positioning of first laser beam by manipulating an actuator that positions the second laser beam, wherein an elastic member opposes a movement of the actuator.
13. The method of claim 12, further comprising the step of writing a label on the second side of the optical disc using the second laser beam.
14. The method of claim 13, further comprising the steps of
inserting an optical disc into the optical disc drive;
performing the steps of positioning the first laser beam, reading or writing the data, positioning the second laser beam, and writing the label without removing the optical disc from the optical disc drive.
15. The method of claim 12, wherein the steps of positioning the first laser beam and positioning the second laser beam are performed simultaneously.
16. The method of claim 12, wherein the step of positioning the second laser beam further comprises the step of causing a linear movement of a laser head, wherein the second laser is located in the laser head.
17. The method of claim 12, wherein the step of positioning the second laser beam further comprises the step of positioning the second laser beam along an arcuate path.
18. The method of claim 12, wherein the step of positioning the second laser beam further comprises the step of controlling a displacement of an actuator by controlling a magnitude of a current applied to the actuator, wherein the second laser beam is positioned by the displacement of the actuator.
19. The method of claim 12, further comprising the steps of:
controlling a positioning the second laser beam with a controller; and
calibrating the positioning of the second laser beam with the controller.
20. An apparatus for laser positioning in an optical disc drive, comprising:
means for positioning a first laser beam generated by a first laser and directed toward a first side of an optical disc site in the optical disc drive; and
means for positioning a second laser beam generated by a second laser and directed toward a second side of the optical disc site in the optical disc drive independent of the positioning of first laser beam by manipulating an actuator that positions the second laser beam, wherein an elastic member opposes a movement of the actuator.
21. The apparatus of claim 20, wherein the means for positioning positions the second laser beam along a linear path.
22. The apparatus of claim 20, wherein the means for positioning positions the second laser beam along an arcuate path.
23. A program embodied in a computer readable medium and executable by a computer system for calibration of a positioning assembly that positions a laser beam generated by a laser and directed toward a side of an optical disc site in an optical disc drive, the positioning assembly comprising an actuator that positions the laser beam, and an elastic member that opposes a movement of the actuator, the program comprising:
code that positions the laser beam on at least one laser calibration position; and
code that calculates a gain of the actuator from an actuator input identified from at least two laser calibration positions.
24. The program embodied in the computer readable medium and executable by the computer system of claim 23, wherein the code that positions the laser beam on at least one laser calibration position positions the laser beam on at least two laser positions.