MICRO INERTIAL MEASUREMENT SYSTEM

• US 20130111993A1
• Filed: 12/06/2010
• Published: 05/09/2013
• Est. Priority Date: 08/09/2010
• Status: Active Grant

• Current Assignee: SZ DJI Technology Co., Ltd. (d/b/a DJI) (iFlight Technology Company Limited)
• Original Assignee: SZ DJI Technology Co., Ltd. (d/b/a DJI) (iFlight Technology Company Limited)
• Inventors: Wang, Tao
• Granted Patent: US 9,213,046 B2
• Time in Patent Office: Days
• US Class Current: 73/514.01
• CPC Class Codes: F16F 15/022 using dampers and springs in combination
• CPC Class Codes: F16F 15/04 using elastic means single elements or their attachment F16F1/00 - F16F13/00; F16F15/023, F16F15/03 take precedence
• CPC Class Codes: F16F 15/085 Use of both rubber and metal springs
• CPC Class Codes: G01C 19/5783 Mountings or housings not specific to any of the devices covered by groups G01C19/5607 - G01C19/5719
• CPC Class Codes: G01C 21/166 Mechanical, construction or arrangement details of inertial navigation systems
• CPC Class Codes: G01P 1/02 Housings
• CPC Class Codes: G01P 15/14 by making use of gyroscopes gyroscopes per se G01C19/00
• CPC Class Codes: G01P 15/18 in two or more dimensions

Abstract

A micro inertial measurement system includes a housing, a sensing module, and a damper. The sensing module includes a rigid sensing support, a measuring and controlling circuit board mounted on the rigid sensing support and an inertial sensor set on the measuring and controlling circuit board. The inertial sensor includes a gyroscope and an accelerometer. The sensing module is mounted in the housing. The damper is mounted in the housing and set in the gap between the sensing module and the inside wall of the housing. By use of the above-mentioned structure, the noise immunity of the inertial measuring system can be greatly improved, and the volume and weight of the inertial measuring system can be greatly reduced.

Claims

1. A micro inertial measurement system, comprising a housing, a sensing module and a damper;

wherein the sensing module includes a rigid sensing support, a measuring and controlling circuit board mounted on the sensing support and an inertial sensor provided on the measuring and controlling circuit board;

the inertial sensor includes a gyroscope and an accelerometer;

the sensing module is received in the housing;

the damper is received in the housing and provided in the gap between the sensing module and an inside wall of the housing.

2. The micro inertial measurement system of claim 1, wherein said sensing module furthering includes a sensing support, said measuring and controlling circuit board is mounted on said sensing support, said inertial sensor includes a gyroscope and an accelerometer, the sensing support is a rigid support in the shape of cube and a groove is engraved on at least one of its surfaces;

the measuring and controlling circuit board is a flexible one;

at least a portion of circuit components on the flexible measuring and controlling circuit board is embedded in the groove on at least one surface.

3. A The micro inertial measurement system of claim 2, wherein six surfaces of the sensing support are all engraved with the groove;

the number of the flexible measuring and controlling circuit board is up to six, and the flexible measuring and controlling circuit boards cover the surfaces of the sensing support respectively;

the circuit components on each flexible measuring and controlling circuit board are embedded in the groove on its corresponding surface of the sensing support so as to make the flexible measuring and controlling circuit board cover each surface of the sensing support smoothly.

4. The micro inertial measurement system of claim 3, wherein the sensing module also includes an anti-aliasing circuit and an A/D switching circuit provided on the flexible measuring and controlling circuit board;

the inertial sensor includes three gyroscopes and one accelerometer;

such circuit modules are arranged on the flexible measuring and controlling circuit boards, respectively.

5. The micro inertial measurement system of claim 4, wherein the flexible measuring and controlling circuit boards are integrated together to form an integrated structure, and they cover each surface of the sensing support completely after they have bent by an angle of 90°

along the edges of the sensing support respectively.

6. The micro inertial measurement system of claim 3, wherein the damper includes at least two damping units, one of which is arranged in the gap between one corresponding surface of the sensing module and the inside wall of the housing.

7. The micro inertial measurement system of claim 4, wherein the damper comprises up to six damping units.

8. The micro inertial measurement system of claim 7, wherein the sensing module is hung at the centre of an inner cavity of the housing by up to six damping units, and the elastic centre P of the damper is coincident with the centroidal m of the sensing module.

9. The micro inertial measurement system of anyone of claims 1, wherein the housing includes an upper housing with an opening in its lower part and a lower cover provided at the opening.

10. The micro inertial measurement system of claim 1, wherein said sensing module furthering includes a sensing support, said measuring and controlling circuit board is mounted on said sensing support.

11. The micro inertial measurement system of claim 2, wherein said inertial sensor includes a gyroscope and an accelerometer.