1. A motor driving apparatus comprising a power circuit that controls, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the power circuit varies resistance of the feedback variable resistance at a time of start of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
2. The motor driving apparatus according to claim 1, wherein the power circuit includes an overvoltage protection circuit, and a short protection circuit, and
the power circuit varies the resistance in such a manner that the output voltage is within a range such that any one of the overvoltage protection circuit and the short protection circuit is not activated.
3. The motor driving apparatus according to claim 1, wherein the power circuit varies the resistance in such a manner that the output voltage is lowered when a load is applied.
4. The motor driving apparatus according to claim 1, wherein the power circuit varies, by discharging a voltage of a capacitor provided at a later stage, the resistance in such a manner that the output voltage is lowered.
5. The motor driving apparatus according to claim 1, wherein the motor driving apparatus is used for a power source of a motor that is used for a lens barrel for an image input unit.
6. A motor driving apparatus comprising a power circuit that controls, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the power circuit varies resistance of the feedback variable resistance at a time of termination of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
7. The motor driving apparatus according to claim 6, wherein the power circuit includes an overvoltage protection circuit, and a short protection circuit, and
the power circuit varies the resistance in such a manner that the output voltage is within a range such that any one of the overvoltage protection circuit and the short protection circuit is not activated.
8. The motor driving apparatus according to claim 6, wherein the power circuit varies the resistance in such a manner that the output voltage is lowered when a load is applied.
9. The motor driving apparatus according to claim 6, wherein the power circuit varies, by discharging a voltage of a capacitor provided at a later stage, the resistance in such a manner that the output voltage is lowered.
10. The motor driving apparatus according to claim 6, wherein the motor driving apparatus is used for a power source of a motor that is used for a lens barrel for an image input unit.
11. A motor driving apparatus comprising a power circuit that controls, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the power circuit varies resistance of the feedback variable resistance at times of start and termination of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
12. The motor driving apparatus according to claim 11, wherein the power circuit includes an overvoltage protection circuit, and a short protection circuit, and
the power circuit varies the resistance in such a manner that the output voltage is within a range such that any one of the overvoltage protection circuit and the short protection circuit is not activated.
13. The motor driving apparatus according to claim 11, wherein the power circuit varies the resistance in such a manner that the output voltage is lowered when a load is applied.
14. The motor driving apparatus according to claim 11, wherein the power circuit varies, by discharging a voltage of a capacitor provided at a later stage, the resistance in such a manner that the output voltage is lowered.
15. The motor driving apparatus according to claim 11, wherein the motor driving apparatus is used for a power source of a motor that is used for a lens barrel for an image input unit.
16. A digital camera comprising a motor driving apparatus that includes a power circuit that controls, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the power circuit varies resistance of the feedback variable resistance at a time of start of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
17. A digital camera comprising a motor driving apparatus that includes a power circuit that controls, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the power circuit varies resistance of the feedback variable resistance at a time of termination of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
18. A digital camera comprising a motor driving apparatus that includes a power circuit that controls, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the power circuit varies resistance of the feedback variable resistance at times of start and termination of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
19. A motor controlling method comprising controlling, via a feedback variable resistance, an output voltage that is applied to a motor, wherein
the controlling includes varying resistance of the feedback variable resistance at a time of at least one of start of activation of the motor thereby causing the motor to activate at any one of a high speed and a low speed.
20. The motor controlling method according to claim 19, wherein the controlling includes varying the resistance in such a manner that the output voltage is within a range such that any one of an overvoltage protection circuit (1-23) and a short protection circuit (1-23) that are included in a power circuit is not activated.
21. The motor driving apparatus according to claim 19, wherein the controlling includes varying the resistance in such a manner that the output voltage is lowered when a load is applied.
22. The motor controlling method according to claim 19, wherein the controlling includes varying, by discharging a voltage of a capacitor that is provided at a later stage in a power circuit, the resistance in such a manner that the output voltage is lowered.
23. The motor controlling method according to claim 19, wherein the motor controlling method is used to control a power source of a motor that is used for a lens barrel for an image input unit.
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 switch for linking a cluster of servers to a data storage facility, the switch comprising:
a facility to block ports to data traffic while allowing passage of cluster monitoring traffic,
a server malfunction monitor which monitors a characteristic from the servers for an indication of a malfunctioning server and when a malfunctioning server is indicated blocks data traffic on a respective port coupled to said malfunctioning server, and
a repaired server monitor which monitors for an indication of correction of the malfunctioning server.
2. The switch of claim 1 in which the characteristic comprises arrival of IAmAlive signals from the servers in said cluster within a predetermined time interval.
3. The switch of claim 1 in which the characteristic is monitored for out of profile behavior.
4. The switch of claim 1 in which a port blocked to data traffic is automatically opened when a previously malfunctioning server attached to the port resumes correct functioning as detected by said repaired server monitor.
5. A data storage network comprising:
(a) a resilient cluster of servers;
(b) a data storage facility; and
(c) a switch coupling each of said servers to said data storage facility;
wherein
(d) the servers each transmit cluster control signals that provide an indication of the functioning of a respective server, and
(e) said switch detects said cluster control signals and when an indication of a malfunctioning server is determined, blocks access of the malfunctioning server to the storage facility but maintains monitoring for cluster control signals related to the malfunctioning server.
6. The data storage network of claim 5 in which the servers monitor one another and initiate a shut port procedure that is transmitted to the switch in the event of a server malfunction.
7. The data storage network of claim 5 in which the switch initiates a shut port procedure when it detects a malfunction.
8. The data storage network of claim 5 further comprising means for automatically determining correction of the malfunction in response to said maintained monitoring cluster control signals from said malfunctioning server.
9. a method of operating a data storage network comprising a resilient cluster of servers, a data storage facility and a switch coupling each of said servers to said data storage facility, said method comprising:
transmitting, from each of said servers to said switch, cluster control signals that provide an indication of the functioning of respectively associated servers;
detecting, in said switch, said cluster control signals; and
when an indication of a malfunctioning server is determined by said switch, blocking by means of said switch access of the malfunctioning server to the storage facility while maintaining monitoring by said switch for cluster control signals related to the malfunctioning server.