US 12,292,288 B2
Azimuth/attitude angle measuring device
Takafumi Moriguchi, Amagasaki (JP)
Assigned to Sumitomo Precision Products Co., Ltd., Amagasaki (JP)
Appl. No. 17/913,251
Filed by Sumitomo Precision Products Co., Ltd., Amagasaki (JP)
PCT Filed Mar. 23, 2021, PCT No. PCT/JP2021/011897
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2021/193597, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-052433 (JP), filed on Mar. 24, 2020.
Prior Publication US 2023/0140455 A1, May 4, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01C 21/16 (2006.01); G01C 17/28 (2006.01); G01C 19/5712 (2012.01)
CPC G01C 21/16 (2013.01) [G01C 17/28 (2013.01); G01C 19/5712 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An azimuth/attitude angle measuring device comprising:
a first angular velocity sensor that detects an angular velocity around a first axis;
a second angular velocity sensor that detects an angular velocity around a second axis in a direction different from the first axis;
a power supply unit that supplies power to the first angular velocity sensor and the second angular velocity sensor; and
a control unit, wherein
the first angular velocity sensor and the second angular velocity sensor each include
a vibrator,
a primary side control circuit that has a closed control loop, an output of the closed control loop inducing primary vibration in the vibrator, and
a secondary side control circuit that has a closed control loop for detecting secondary vibration generated in the vibrator due to an angular velocity applied to the vibrator,
the primary side control circuit and the secondary side control circuit are configured so that a function as the primary side control circuit and a function as the secondary side control circuit are interchangeable, and
the control unit is configured so that, when an angular velocity to be used for an operation before and after interchanging the function of the primary side control circuit and the function of the secondary side control circuit is detected by one of the first angular velocity sensor and the second angular velocity sensor, the control unit does not perform control for interchanging the function of the primary side control circuit and the function of the secondary side control circuit in the other of the first angular velocity sensor and the second angular velocity sensor.