DEVICE FOR MEASURING ROTATION ANGLE ACCELERATION

• US 20150176994A1
• Filed: 05/15/2013
• Published: 06/25/2015
• Est. Priority Date: 06/22/2012
• Status: Active Grant

• Current Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Inventors: Yamamoto, Yasuyuki
• Granted Patent: US 9,464,896 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01C 19/5705 using masses driven in reciprocating rotary motion about an axis
• CPC Class Codes: G01C 19/5712 the devices involving a micromechanical structure
• CPC Class Codes: G01L 1/2243 the supports being parallelogram-shaped
• CPC Class Codes: G01L 3/1428 using electrical transducers
• CPC Class Codes: G01P 15/0888 for indicating angular acceleration

Abstract

In a case where (i) accelerations except a specific angular acceleration cause a problem of noise and (ii) low-cost production is required, the present invention provides a device for measuring an angular acceleration which device has reduced noise that is caused by accelerations except the specific angular acceleration, by having an arrangement in which an oscillator is supported by a spring structure capable of greatly restraining movement in directions except a specific rotation direction.

A device for measuring an angular acceleration integrally fabricated by a semiconductor microfabrication technology, the device including: an oscillator rotating around a rotating shaft as a center; a plurality of nodes for supporting the oscillator, the plurality of nodes each being provided at a point on a circle whose radius is r and whose center is the rotating shaft; a plurality of parallelogram links each having arms whose length is r, the arms making movement of the plurality of nodes supporting the oscillator become circular movement around the rotating shaft as a center; a supporting section for supporting fixed nodes of the plurality of parallelogram links; a rotation angle detecting section for detecting a rotation angle; and a calculation section for calculating an angular acceleration from the

Claims

1. A device for measuring an angular acceleration comprising:

an oscillator rotating around a rotating shaft as a center;

a plurality of nodes for supporting the oscillator, the plurality of nodes each being provided at a point on a circle whose radius is r and whose center is the rotating shaft;

a plurality of parallelogram links each having arms whose length is r, the arms making movement of the plurality of nodes supporting the oscillator become circular movement around the rotating shaft as a center;

a supporting section for supporting fixed nodes of the plurality of parallelogram links;

a rotation angle detecting section for detecting a rotation angle; and

a calculation section for calculating an angular acceleration from the rotation angle.

2. The device as set forth in claim 1, further comprising:

an actuator for applying force so as to make a displacement angle of the oscillator zero;

a feedback control section for controlling an input signal to be supplied to the actuator in accordance with a measurement signal of the displacement angle, the input signal being controlled so that the displacement angle becomes zero; and

a calculation section for calculating an angular acceleration from the input signal supplied to the actuator.

3. The device as set forth in claim 2, wherein:

the rotation angle detecting sensor, the actuator, the control section, the calculation sections, and a supporting mechanism of the rotating shaft are integrally formed by use of a semiconductor microfabrication technology, by forming the supporting mechanism as a planar hinge structure.