Inertia measurement module for unmanned aircraft

Patent metadata

Field	Value
Publication number	US-10591504-B2
Application number	US-201715809952-A
Country	US
Kind code	B2
Filing date	Nov 10, 2017
Priority date	Sep 2, 2011
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

The present disclosure relates to an inertia measurement module for an unmanned aircraft, which comprises a housing assembly, a sensing assembly and a vibration damper. The vibration damper comprises a first vibration-attenuation cushion; and the sensing assembly comprises a first circuit board, a second circuit board and a flexible signal line for connecting the first circuit board and the second circuit board. An inertia sensor is fixed on the second circuit board, and the first circuit board is fixed on the housing assembly. The inertia measurement module further comprises a weight block, and the second circuit board, the weight block, the first vibration-attenuation cushion and the first circuit board are bonded together. The present disclosure greatly reduces the influence of the operational vibration frequency of the unmanned aircraft on the inertia sensor and improves the measurement stability of the inertia sensor.

First claim

What is claimed is:

1. An inertia measurement module for an unmanned aircraft comprising:
a circuit board with an inertia sensor; and
a weight block including a recess;
wherein:
the circuit board is embedded in the recess; and
the weight block is configured to have a mass such that an inherent frequency of the inertia measurement module is reduced to be less than an operation frequency of the unmanned aircraft.

2. The inertia measurement module of claim 1 , wherein the weight block is made of a metallic material.

3. The inertia measurement module of claim 1 , wherein the weight block has a cuboidal shape.

4. The inertia measurement module of claim 1 , wherein the weight block has a weight in the range from 1 gram to 30 grams.

5. The inertia measurement module of claim 1 , wherein the recess of the weight block has a shape and dimensions substantially matching a shape and dimensions of the circuit board.

6. The inertia measurement module of claim 1 , wherein the recess is formed on only one side of the weight block.

7. The inertia measurement module of claim 1 , wherein the recess does not form a through-hole extending through the weight block.

8. The inertia measurement module of claim 1 , further comprising:
a vibration damper configured to attenuate vibration of the circuit board.

9. The inertia measurement module of claim 8 , further comprising:
a housing assembly accommodating the circuit board and the weight block;
wherein the vibration damper includes a vibration-attenuation cushion fixedly bonded to the circuit board and abutting against an inner wall of the housing assembly.

10. The inertia measurement module of claim 9 , wherein the vibration-attenuation cushion has a hollow part.

11. The inertia measurement module of claim 10 , wherein the hollow part has a cuboidal shape, an circular shape, an ellipsoidal shape, a rhombus shape, or a quincuncial shape.

12. The inertia measurement module of claim 9 , wherein the vibration-attenuation cushion is fixedly bonded to the circuit board through an adhesive layer.

13. The inertia measurement module of claim 12 , wherein a bonding area of the adhesive layer is in the range from about 3% to about 30% of an area of the vibration attenuation cushion.

14. The inertia measurement module of claim 1 , wherein the inertia sensor includes at least one of a gyroscope or an accelerometer.

15. The inertia measurement module of claim 1 , wherein the circuit board includes a flexible circuit board.

16. The inertia measurement module of claim 1 ,
wherein the circuit board is a second circuit board;
the inertia measurement module further comprising:
a first circuit board including at least one of a power source, a memory, a processor, or a circuit module, the first circuit board and the second circuit board being disposed at two opposite sides of the weight block.

17. The inertia measurement module of claim 16 , further comprising:
a signal line coupling the second circuit board to the first circuit board.

18. The inertia measurement module of claim 17 , wherein the signal line includes a flexible signal line.

19. The inertia measurement module of claim 1 , wherein the operation frequency of the unmanned aircraft is in a range from 50 Hz to 200 Hz.

20. The inertia measurement module of claim 1 , wherein the inherent frequency of the inertia measurement module is configured to be less than 50 Hz.

Assignees

• Sz Dji Technology Co Ltd

Inventors

• Wang Tao
• Zhao Tao

Classifications

• G01P1/003 Primary

  used for damping · CPC title

• G01C25/00 Primary

  Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass (testing, calibrating or compensating compasses G01C17/38) · CPC title

• F16F7/104

  the inertia member being resiliently mounted {(F16F7/1022 takes precedence)} · CPC title

• G01P15/0802

  Details · CPC title

• G01C19/5783

  Mountings or housings not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719 · CPC title