Angular relationship detection device and method
AssigneeCanon Kabushiki Kaisha
InventorsHiroyasu Nose, Toshihiko Miyazaki, Kunihiro Sakai, Toshimitsu Kawase, Takahiro Oguchi
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Abstract
An encoder or an information reading device detects a scale with a probe that is vibrated at a predetermined frequency and amplitude in a predetermined direction. The angular positional relationship between the direction of probe vibration and the scale is detected according to frequency spectrum information of a detection signal obtained by detecting the scale with the vibrating probe.
Claims31
A device for detecting an angular relationship between a probe for reading information and an information arrangement arranged in at least one direction within a predetermined surface, said device comprising:
- vibration means for vibrating the probe at a predetermined amplitude and a predetermined frequency in a predetermined direction along said predetermined surface;
- and
- angular relationship detection means for detecting an angular relationship between the direction of vibration of said probe and the direction of arrangement of said information arrangement according to frequency information of a detection signal obtained via said probe during the vibration of said probe by said vibration means.
A method for detecting an angular relationship between a probe for reading information and an information arrangement arranged in at least one direction within a predetermined surface, said method comprising:
- vibrating the probe at a predetermined amplitude and a predetermined frequency in a predetermined direction along said predetermined surface;
- and
- detecting an angular relationship between a direction of vibration of said probe and a direction of arrangement of said information arrangement, said detection being performed according to frequency information of a detection signal obtained via said probe during the vibration of said probe.
A device for detecting an angular relationship between a probe driven for reading information and an information arrangement arranged in at least one direction within a predetermined surface, said device comprising:
- a control circuit for controlling an element for driving the probe to vibrate at a predetermined amplitude and a predetermined frequency in a predetermined direction along said predetermined surface;
- and
- a processing unit for detecting an angular relationship between a direction of vibration of said probe and a direction of arrangement of said information arrangement according to frequency information of a detection signal obtained via said probe during the vibration of said probe by said control circuit.
A device for reading information from an information arrangement arranged in at least one direction within a predetermined surface via a probe, said device comprising:
- signal detection means for obtaining a detection signal via the probe, the information being read from the detection signal of said signal detection means;
- vibration means for vibrating the probe at a predetermined amplitude and a predetermined frequency in a predetermined direction along said predetermined surface;
- and
- angular relationship detection means for detecting an angular relationship between the direction of vibration of said probe and the direction of arrangement of said information arrangement according to frequency information of the detection signal obtained during the vibration of said probe.
An encoder comprising:
- a probe for reading a scale arranged within a predetermined surface;
- an encoder circuit for detecting an amount of movement according to the reading of the scale by said probe;
- a driving element for driving said probe;
- a control circuit for controlling said driving element to vibrate said probe at a predetermined amplitude and a predetermined frequency in a predetermined direction along said predetermined surface;
- and
- a processing unit for detecting an angular relationship between the direction of vibration of said probe and a direction of arrangement of an information arrangement on said scale according to frequency information of a detection signal obtained via said probe during the vibration of said probe by said control circuit.
Dependencies are inferred from the claim text.