1. A high-voltage power supply to output a plusminus high-voltage, the high-voltage power supply comprising:
a plus high-voltage output unit to output the plus high-voltage by using a pulse width modulation (PWM) signal;
a minus high-voltage operation control unit to charge a certain voltage while the plus high-voltage output unit is outputting the plus high-voltage;
a minus high-voltage output unit to output the minus high-voltage by using the certain voltage charged in the minus high-voltage operation control unit; and
a minus high-voltage blocking unit to block the outputting of the minus high-voltage from the minus high-voltage output unit while the plus high-voltage output unit is outputting the plus high-voltage.
2. The high-voltage power supply of claim 1, wherein the minus high-voltage operation control unit charges a voltage supplied from a power source outside the plus high-voltage output unit according to the PWM signal, while the plus high-voltage output unit is outputting the plus high-voltage.
3. The high-voltage power supply of claim 1, wherein the minus high-voltage operation control unit charges a voltage supplied from the plus high-voltage output unit according to the PWM signal, while the plus high-voltage output unit is outputting the plus high-voltage.
4. The high-voltage power supply of claim 1, wherein the minus high-voltage operation control unit charges the certain voltage in an electrolytic capacitor.
5. The high-voltage power supply of claim 1, wherein the minus high-voltage output unit outputs the minus high-voltage within a period of time from when the plus high-voltage output unit stops outputting the plus high-voltage to when all of the voltage charged in the minus high-voltage operation control unit is discharged.
6. The high-voltage power supply of claim 5, wherein when the plus high-voltage output unit outputs the plus high voltage before all of the voltage charged in the minus high-voltage operation control unit is discharged, the minus high-voltage output unit stops outputting the minus high-voltage when the plus high-voltage output unit outputs the plus high-voltage.
7. The high-voltage power supply of claim 1, wherein the minus high-voltage output unit operates by using a ringing choke converter (RCC).
8. The high-voltage power supply of claim 1, wherein the minus high-voltage blocking unit blocks the outputting of the minus high-voltage from the minus high-voltage output unit by using a voltage generated in the plus high-voltage output unit.
9. The high-voltage power supply of claim 8, wherein the minus high-voltage blocking unit blocks the outputting of the minus high-voltage by turning off a transistor to drive the minus high-voltage output unit by using a ground voltage output by the voltage generated in the plus high-voltage output unit by using the PWM signal.
10. The high-voltage power supply of claim 1, wherein the plus high-voltage output unit and the minus high-voltage output unit output the plus high-voltage and the minus high-voltage via the same output terminal.
11. A method of outputting a plusminus high-voltage, the method comprising:
outputting a plus high-voltage by using a PWM signal;
charging a certain voltage while the plus high-voltage is being output; and
outputting a minus high-voltage within a period of time from when outputting the plus high-voltage is stopped to when all of the accumulated voltage is discharged,
wherein the minus high-voltage and the plus high-voltage are not output simultaneously.
12. The method of claim 11, wherein, in the charging of the certain voltage, a voltage supplied according to the PWM signal is charged while the plus high-voltage is output.
13. The method of claim 11, wherein, in the outputting of the minus high-voltage, when the plus high voltage is output again before all of the accumulated voltage is discharged, the minus high-voltage is output until when the plus high-voltage is output again.
14. The method of claim 11, wherein the plus high-voltage and the minus high-voltage are output via the same output terminal.
15. A computer-readable recording medium having recorded thereon a program to cause an image-forming apparatus to execute a method, the method comprising:
outputting a plus high-voltage by using a PWM signal;
charging a certain voltage while the plus high-voltage is being output; and
outputting a minus high-voltage within a period of time from when outputting the plus high-voltage is stopped to when the accumulated certain voltage is discharged,
wherein the minus high-voltage and the plus high-voltage are not output simultaneously.
16. A high-voltage power supply, comprising:
a positive high-voltage output unit to receive a first input signal and to output a positive high-voltage corresponding to the first input signal;
a negative high-voltage output unit to receive a second input signal and to output a negative high-voltage corresponding to the second input signal; and
a negative high-voltage blocking unit to prevent the negative high-voltage output unit from outputting a negative high-voltage when the positive high-voltage output unit outputs a positive high-voltage.
17. The high-voltage power supply according to claim 16, wherein the negative high-voltage blocking unit comprises:
an RC filter to receive an input from the positive high-voltage output unit; and
a transistor having a gate connected to the input from the positive high-voltage output unit, the transistor configured to output a ground signal to the negative high-voltage output unit when the gate is on.
18. The high-voltage power supply according to claim 16, wherein the positive high-voltage output unit and the negative high-voltage output unit are connected to a same output terminal.
19. The high-voltage power supply according to claim 16, further comprising a negative high-voltage operation control unit to supply an input voltage to the negative high-voltage output unit.
20. The high-voltage power supply according to claim 19, wherein the negative high-voltage operation control unit includes a capacitor to charge when the positive high-voltage output unit outputs a positive, high voltage and to discharge when the positive high-voltage output unit does not output a positive, high voltage.
21. The high-voltage power supply according to claim 20, wherein the capacitor is an electrolytic capacitor.
22. The high-voltage power supply according to claim 20, wherein the negative high-voltage operation control unit comprises:
a transistor having a gate connected to the first input and a source connected to a power supply, to output a predetermined voltage from the power supply to the capacitor to charge the capacitor when the gate is on.
23. The high-voltage power supply according to claim 20, wherein the capacitor of the negative high-voltage operation control unit is connected to an input from the positive high-voltage output unit, a voltage level of the input corresponding to a voltage level output from the positive high-voltage output unit.
24. A method of outputting a positive high-voltage and a negative high-voltage, the method comprising:
converting a first input signal into a positive high-voltage output signal;
converting a second input signal into a negative high-voltage output signal; and
blocking the output of the negative high-voltage signal when the positive high-voltage signal is output.
25. The method according to claim 24, wherein blocking the output of the negative high-voltage signal includes:
outputting a ground signal to a negative high-voltage output unit when the positive high-voltage signal is output.
26. The method according to claim 24, further comprising:
outputting the second input signal to a negative high-voltage output unit only when the positive high-voltage signal is not output.
27. The method according to claim 26, wherein outputting the second input signal comprises:
charging a capacitor when the positive high-voltage signal is output; and
discharging the capacitor as the second input signal when the positive high-voltage signal is not output.
28. An image-forming apparatus, comprising:
an image-development unit to receive data and to form an image on a recording medium, the image-development unit including:
a photoconductor to form an electrostatic latent image; and
a high-power voltage supply having an output node connected to the photoconductor to control a charge of the photoconductor,
wherein, the high-power voltage supply comprises:
a positive high-voltage output unit to receive a first input signal and to output to the output node a positive high-voltage corresponding to the first input signal;
a negative high-voltage output unit to receive a second input signal and to output to the output node a negative high-voltage corresponding to the second input signal; and
a negative high-voltage blocking unit to prevent the negative high-voltage output unit from outputting a negative high-voltage when the positive high-voltage output unit outputs a positive high-voltage.
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. A pickup head actuator for a recording medium device that is capable of accessing data on a recording medium inside the recording medium device, the pickup head actuator comprising:
a base providing the installation of more than one data IO elements;
a support axis installed with the base so that the base is able to move along the support axis in the perpendicular direction of the recording medium and to rotate about the support axis;
a focusing unit containing at least one focusing coil and a corresponding focusing magnet, the focusing coil being installed on the base around the support axis, the focusing magnet being installed on the outer side of the corresponding focusing coil, so that when the focusing coil is in action the magnetic force generated by the focusing magnet pushes the base to move along the support axis;
a tracking unit containing at least one tracking coil and two tracking magnets, the tracking coil being installed on the outer side of the base and the tracking magnets being installed next to the base, wherein the base rotates about the support axis in response to the action of the tracking coil so that the tracking coil is in alignment with one of the tracking magnets and makes a small-angle wiggle under the interaction between the tracking coil and the tracking magnets; and
a magnetic inductor installed on the base and attracted by one of the tracking magnets, keeping the base floating in its normal state such that the base reaches balance at different floating distances from the recording medium for the data IO element to function at different work heights.
2. The pickup head actuator of claim 1, wherein the tracking magnets have a height difference between their central positions so that the base balances at different heights.
3. The pickup head actuator of claim 2, wherein the two tracking magnets are disposed at different heights.
4. The pickup head actuator of claim 2, wherein the two tracking magnets have different sizes.
5. The pickup head actuator of claim 1, wherein the data IO elements are selected from the group consisting of the combinations of optical near-field IO elements, optical far-field IO elements, and magnetic IO elements.
6. The pickup head actuator of claim 1, wherein the data IO elements are selected from the group consisting of the combinations of objective lenses with predetermined NA’s (Numerical Aperture), SIL’s (Solid Immersion Lens), magnetic heads, holographic lasers, SIM’s (Solid Immersion Mirror), and VCSEL’s (Vertical Cavity Surface Emitting Laser).
7. The pickup head actuator of claim 1, wherein there are two tracking coils with only one of them being in alignment with one of the tracking magnets at a time.
8. The pickup head actuator of claim 7, wherein each of the tracking coils has a magnetic inductor installed at a different height, so that when one of the tracking coils is in alignment with one of the tracking magnets it is attracted by the corresponding tracking magnet, keeping the base floating at a different height.
9. The pickup head actuator of claim 1, wherein the data IO element is an optical IO element in combination with a magnetic field generator for accessing data stored on magneto-optical recording media.
10. The pickup head actuator of claim 1, wherein the data IO element uses an elastic object installed on the base so that the data IO element is capable of making relative motion to the base.