Apparatus for motor control of an apparatus with a motor

Patent metadata

Field	Value
Publication number	US-9365060-B2
Application number	US-201113015449-A
Country	US
Kind code	B2
Filing date	Jan 27, 2011
Priority date	Jan 29, 2010
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

An apparatus includes a driven object, a motor configured to function as a driving source of the driven object, a scanning unit configured to cause the driven object to move, and include a first pulley to which the motor is connected, a second pulley disposed opposing to the first pulley, and a member stretched around the first pulley and the second pulley, an acquisition unit configured to acquire position information of the driven object, and a signal generation unit configured to generate a periodic signal for controlling driving of the motor based on the position information acquired by the acquisition unit, wherein the signal generation unit increases a period of the signal to be generated, as a length of the member to which a pulling force is applied becomes shorter.

First claim

What is claimed is:

1. An apparatus comprising:
a carriage;
an encoder configured to output a signal according to a movement of the carriage;
a movement mechanism configured to reciprocate the carriage, wherein the movement mechanism includes a motor, a motor pulley connected to the motor, a driven pulley, and a belt stretched between the motor pulley and the driven pulley, and having two belt sections configured to move between the motor pulley and the driven pulley in opposite directions to each other, along with rotation of the motor pulley, the carriage being supported on either of the two belt sections,
wherein the carriage moves from a first side near the driven pulley toward a second side near the motor pulley as a first directional movement and the carriage moves from the second side toward the first side as a second directional movement, and wherein an elongation of the belt in the first directional movement is different from that in the second directional movement;
a signal generation unit configured to generate a first control signal, according to a drive instruction and position information based on the signal output from the encoder, and to generate a second control signal having a period used for compensating cogging torque ripples of the motor; and
a driving unit configured to drive the motor using the first control signal and the second control signal,
wherein, the signal generation unit sets a first value of the period of the second control signal for a maximum constant speed in the first directional movement, and a second value of the period of the second control signal for a maximum constant speed in the second directional movement, respectively, and the first value and the second value are different according to the elongations of the belt.

2. The apparatus according to claim 1 ,
wherein, in each of the first directional movement and the second directional movement, the carriage is configured to switch from an acceleration movement to the maximum constant speed movement, and to switch from the maximum constant speed movement to a deceleration movement after passing through a maximum constant speed region, and
wherein the first value for the maximum constant speed region in the first directional movement, is set to be smaller than the second value for the maximum constant speed region in the second directional movement.

3. The apparatus according to claim 2 ,
wherein, in the first directional movement, the carriage is configured to be pulled toward the second side by a belt part between the motor pulley and the carriage in one of the two belt sections, on which the carriage is supported, and
wherein, in the first directional movement, as the carriage comes close to the motor pulley in the maximum constant speed region, a value of the period of the second control signal becomes smaller.

4. The apparatus according to claim 3 ,
wherein, in the second directional movement, the carriage is configured to be pulled toward the first side by a belt section consisting of one of the two belt sections, on which the carriage is not supported, and a belt part between the driven pulley and the carriage in the other one of the two belt sections, on which the carriage is supported, and
wherein, in the second directional movement, as the carriage comes away from the motor pulley in the maximum constant speed region, a value of the period of the second control signal becomes smaller.

5. The apparatus according to claim 1 , wherein the carriage includes a recording head or a reading unit.

6. An apparatus comprising:
a carriage;
an encoder configured to output a signal according to a movement of the carriage;
a movement mechanism configured to reciprocate the carriage, wherein the movement mechanism includes a motor, a motor pulley connected to the motor, a driven pulley, and a belt stretched between the motor pulley and the driven pulley, and having two belt sections configured to move between the motor pulley and the driven pulley in opposite directions to each other, along with rotation of the motor pulley, the carriage being supported on either of the two belt sections,
wherein the carriage moves from a first side near the driven pulley toward a second side near the motor pulley as a first directional movement and the carriage moves from the second side toward the first side a second directional movement, and wherein an elongation of the belt in the first directional movement is different from that in the second directional movement;
a signal generation unit configured to generate a first control signal, according to a drive instruction and position information based on the signal output from the encoder, and to generate a second control signal having a period used for compensating cogging torque ripples of the motor; and
a driving unit configured to drive the motor using the first control signal and the second control signal,
wherein, in each of the first directional movement and the second directional movement the carriage is configured to switch from an acceleration movement to a maximum constant speed movement at a first position, and to switch from the maximum constant speed movement to a deceleration movement at a second position after passing through the first position and a maximum constant speed region, and
wherein, in the first and the second directional movements, the signal generation unit sets, in the maximum constant speed region, a value of the period of the second control signal at a position near the first position to be different from a value of the period of the second control signal at a position near the second position according to the elongations of the belt.

7. The apparatus according to claim 6 ,
wherein, in the first directional movement, the carriage is configured to be pulled toward the second side of the motor pulley by a belt part between the motor pulley and the carriage in one of the two belt sections, on which the carriage is supported, and
wherein, in the first directional movement, as the carriage comes close to the motor pulley in the maximum speed region, a value of the period of the second control signal becomes smaller.

8. The apparatus according to claim 7 , wherein
wherein, in the second directional movement, the carriage is configured to be pulled toward the first side of the driven pulley by a belt section consisting of one of the two belt sections, on which the carriage is not supported, and a belt part between the driven pulley and the carriage in another one of the two belt sections, on which the carriage is supported,
wherein, in the second directional movement, as the carriage comes away from the motor pulley in the maximum constant speed region, a value of the period of the second control signal becomes smaller.

9. The apparatus according to claim 6 , wherein the carriage includes a recording head or a reading unit.

Assignees

• Iwadate Yasuhiro
• Canon Kk

Inventors

• Iwadate Yasuhiro

Classifications

• H04N2201/04727

  on a linear encoder · CPC title

• H04N2201/04734

  Detecting at frequent intervals, e.g. once per line for sub-scan control · CPC title

• H04N2201/04794

  Varying the control or compensation during the scan, e.g. using continuous feedback or from line to line · CPC title

• H04N2201/04798

  Varying the main-scan control during the main-scan, e.g. facet tracking · CPC title

• H04N2201/02439

  Positioning method · CPC title