초록 ▼

When starting charging of an internal battery as a result of connection of an external power source by an AC adapter, a charging control unit sets a first charging voltage at which the charging capacity of the internal battery is maximized. When starting the charging from recognition of reduced capa

When starting charging of an internal battery as a result of connection of an external power source by an AC adapter, a charging control unit sets a first charging voltage at which the charging capacity of the internal battery is maximized. When starting the charging from recognition of reduced capacity of the internal battery due to its self-discharge in desk-top use where the AC adapter is in connection at all times, the charging control unit sets a second charging voltage lower than the first charging voltage to prevent the battery from degrading.

대표청구항 ▼

When starting charging of an internal battery as a result of connection of an external power source by an AC adapter, a charging control unit sets a first charging voltage at which the charging capacity of the internal battery is maximized. When starting the charging from recognition of reduced capa

When starting charging of an internal battery as a result of connection of an external power source by an AC adapter, a charging control unit sets a first charging voltage at which the charging capacity of the internal battery is maximized. When starting the charging from recognition of reduced capacity of the internal battery due to its self-discharge in desk-top use where the AC adapter is in connection at all times, the charging control unit sets a second charging voltage lower than the first charging voltage to prevent the battery from degrading. the power interruption and upon the counter being prevented from counting the current ripples contained in the armature current signal of the motor during the slowdown of the motor shaft, an amount of current ripples expected to be contained in the armature current signal of the motor during the slowdown of the motor shaft is estimated. The position of the element during the slowdown of the motor shaft is determined based on the estimated amount of current ripples. ing frequency. 6. The ballast according to claim 5, wherein f2 is greater than f1, where f1 is a maximum driving frequency of the DC/AC conversion portion in the first operation mode and f2 is a driving frequency of the DC/AC conversion portion in the second operation mode. 7. A bulb-shaped fluorescent lamp, comprising a base and the ballast according to claim 1, wherein the AC/DC conversion portion, the dimming control portion, the DC/AC conversion portion, and the discharge lamp are formed integrally. ed together in plan having the shape of a fan. 5. The microactuator of claim 4 wherein the rotatable member, the plurality of comb drive assemblies and the first and second springs when viewed together in plan subtend an angle of approximately 180° or less about the axis of rotation. 6. An electrostatic microactuator comprising a substantially planar substrate, a rotatable member overlying the substrate for rotation about an axis of rotation extending perpendicular to the substrate, at least one electrostatic drive assembly extending substantially radially from the axis of rotation and having first and second electrostatic drive members, the first electrostatic drive member being mounted on the substrate and the second electrostatic drive member being coupled to the rotatable member, and not more than first and second spaced-apart springs, each spring having a first end portion coupled to the substrate and a second end portion coupled to the second electrostatic drive member for suspending the second electrostatic drive member and the rotatable member over the substrate, the second electrostatic drive member being movable in a direction of travel about the axis of rotation between first and second positions relative to the first electrostatic drive member. 7. The microactuator of claim 6 wherein the at least one electrostatic drive assembly is disposed between the first and second spaced-apart springs. 8. The microactuator of claim 6 wherein each of the first and second electrostatic drive members is a comb drive member provided with comb drive fingers. 9. The microactuator of claim 8 wherein the second comb drive member is movable relative to the first comb drive member from a first position in which the comb drive fingers of the first and second comb drive members are not substantially fully interdigitated to a second position in which the comb drive fingers of the first and second comb drive members are substantially fully interdigitated. 10. The microactuator of claim 6 wherein the first and second springs each extend radially from the axis of rotation. 11. The microactuator of claim 6 further comprising a movable structure overlying the substrate, the movable structure including the rotatable member and the second electrostatic drive member and having a center mass at the axis of rotation for inhibiting undesirable movement of the movable structure in response to externally applied accelerations to the microactuator. 12. A micromechanical device comprising a substantially planar substrate, a rotatable member overlying the substrate for rotation about an axis of rotation extending perpendicular to the substrate, not more than first and second spaced-apart springs, each spring having a first end portion coupled to the substrate and a second end portion coupled to the rotatable member for suspending the rotatable member over the substrate, and a micromotor carried by the substrate and coupled to the rotatable member for driving the rotatable member about the axis of rotation between first and second positions relative to the substrate. 13. The device of claim 12 wherein the first and second springs each extend radially from the axis of rotation. 14. The device of claim 12 wherein the micromotor is disposed between the first and second spaced-apart springs. 15. An electrostatic microactuator comprising a substantially planar substrate, a rotatable member overlying the substrate for rotation about an axis of rotation extending perpendicular to the substrate, a plurality of electrostatic drive assemblies extending substantially radially from the axis of rotation, each of the plurality of electrostatic drive assemblies having a first electrostatic drive member mounted on the substrate and a second electrostatic drive member coupled to the rotatable member, and first and second spaced-apart springs, each spring having a first end portion coupled to the substrate and a second end portion coupled to the second electrostatic drive member for suspending the second electrostatic drive member and the rotatable member over the substrate, each second electrostatic drive member being movable in a direction of travel about the axis of rotation between first and second positions relative to the respective first electrostatic drive member, the rotatable member, the plurality of electrostatic drive assemblies and the first and second springs when viewed together in plan having the shape of a sector of a circle. 16. The microactuator of claim 15 wherein the rotatable member, the plurality of electrostatic drive assemblies and the first and second springs subtend an angle of approximately 180° or less about the axis of rotation. 17. The microactuator of claim 16 wherein the rotatable member, the plurality of electrostatic drive assemblies and the first and second springs subtend an angle of approximately 90° about the axis of rotation. 18. The microactuator of claim 15 wherein each of the first and second electrostatic drive members is a comb drive member having comb drive fingers. 19. The microactuator of claim 18 wherein the comb drive fingers of the first and second comb drive members are not substantially fully interdigitated when in the first position and the comb drive fingers of the first and second comb drive members are substantially fully interdigitated when in the second position. 20. The microactuator of claim 15 wherein the first and second springs each extend radially from the axis of rotation. 21. An electrostatic microactuator comprising a substantially planar substrate, a rotatable member overlying the substrate for rotation about an axis of rotation extending perpendicular to the substrate, a plurality of comb drive assemblies extending substantially radially from the axis of rotation, each of the plurality of comb drive assemblies having a first comb drive member mounted on the substrate and a second comb drive member coupled to the rotatable member and having the shape of a truncated sector of a circle, and first and second spaced-apart springs, each spring having a first end portion coupled to the substrate and a second end portion coupled to the second comb drive member for suspending the second comb drive member and the rotatable member over the substrate, each of the first and second comb drive members being provided with comb drive fingers, the comb drive fingers of the second comb drive member having respective distal ends which extend along an imaginary line that does not intersect the axis of rotation. 22. The microactuator of claim 21 wherein the comb drive fingers of the first comb drive member having respective distal ends which extend along an imaginary line that does not intersect the axis of rotation. 23. The microactuator of claim 21 wherein the second comb drive member is movable relative to the first comb drive member from a first position in which the comb drive fingers of the first and second comb drive members are not substantially fully interdigitated to a second position in which the comb drive fingers of the first and second comb drive members are substantially fully interdigitated. 24. The microactuator of claim 21 wherein the first and second springs each extend radially from the axis of rotation. 25. The microactuator of claim 21 wherein the rotatable member, the plurality of comb drive assemblies and the first and second springs when viewed together in plan have the shape of a sector of a circle. 26. The microactuator of claim 25 wherein the rotatable member, the plurality of comb drive assemblies and the first and second springs when viewed together in plan subtend an angle of approximately 180° or less about the axis of rotation. 27. An electrostatic microactuator comprising a substantially planar substrate, a rotatable member overlying the substrate for rotation about an axis of rotation extending perpendicular to the substrate, first and second linear micromotors for imparting substantially linear motion and a f