Acceleration sensor and angular velocity sensor

• US 9,523,705 B2
• Filed: 07/09/2014
• Issued: 12/20/2016
• Est. Priority Date: 07/31/2013
• Status: Expired due to Fees

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Kim, Jong Woon, Lee, Jung Won, Shin, Seung Joo, Jeung, Won Kyu
• Primary Examiner(s): Laballe, Clayton E
• Assistant Examiner(s): Butler, Kevin
• Application Number:
  US14/326,714
• Publication Number:
  US 20150033860A1
• Time in Patent Office: 895 Days
• Field of Search: 735/143.5, 735/143.2
• US Class Current: 1/1
• CPC Class Codes: B60R 21/0132 responsive to vehicle motion parameters , e.g. to vehicle longitudinal or transversal deceleration or speed value
• CPC Class Codes: G01C 19/56 Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
• CPC Class Codes: G01C 19/5719 using planar vibrating masses driven in a translation vibration along an axis
• CPC Class Codes: G01P 15/08 with conversion into electric or magnetic values
• CPC Class Codes: G01P 15/0802 Details
• CPC Class Codes: G01P 15/135 by making use of contacts which are actuated by a movable inertial mass
• CPC Class Codes: G01P 2015/0805 being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration

Abstract

Disclosed herein is an acceleration sensor, including: a mass body part including a first mass body and a second mass body; a frame supporting the first mass body and the second mass body; first flexible parts each connecting the first mass body and the second mass body to the frame; and second flexible parts each connecting the first mass body and the second mass body to the frame, wherein the first mass body and the second mass body are each connected to the frame so as to be eccentric by the second flexible part.

Claims

1. An acceleration sensor, comprising:

a mass body part comprising a first mass body and a second mass body;

a frame supporting the first mass body and the second mass body;

first flexible parts each connecting the first mass body and the second mass body to the frame; and

second flexible parts each connecting the first mass body and the second mass body to the frame,

wherein the second flexible parts are connected to the first mass body and the second mass body so as to be spaced apart from the centers of gravity of the first mass body and the second mass body,

wherein the first flexible parts have a width W1 in a Y-axis direction larger than a thickness T1 in the Z-axis direction, and

wherein the second flexible parts have a width W2 in a Z-axis direction larger than a thickness T2 in the X-axis direction.

2. The acceleration sensor as set forth in claim 1, wherein the first flexible parts and the second flexible parts are disposed in a direction perpendicular to each other.

3. The acceleration sensor as set forth in claim 1, wherein the first mass body and the second mass body have one end having the first flexible parts each connected thereto and have the other end portions having the second flexible parts each connected thereto.

4. The acceleration sensor as set forth in claim 3, wherein the first mass body and the second mass body have one end having the first flexible parts each connected thereto with respect to an X axis direction and have the other end portions having the second flexible parts connected thereto in a Y axis direction with respect to the X axis direction.

5. The acceleration sensor as set forth in claim 3, wherein the first mass body and the second mass body face each other so that coupling parts having the second flexible parts each coupled thereto are adjacent to each other.

6. The acceleration sensor as set forth in claim 1, wherein the first flexible parts are beams having a surface formed by one axis direction and the other axis direction and a thickness extended in a direction perpendicular to the surface.

7. The acceleration sensor as set forth in claim 6, wherein the first flexible parts have a thickness in a Z axis direction, and are beams disposed along a surface formed by an X axis and a Y axis.

8. The acceleration sensor as set forth in claim 7, wherein the first flexible parts connect one end portion of the first mass body and the frame to each other and connect one end portion of the second mass body and the frame to each other, in the X axis direction.

9. The acceleration sensor as set forth in claim 1, wherein one surface of the first flexible parts or the second flexible parts is provided with a sensing unit configured to sense displacement of the first mass body and the second mass body.

10. The acceleration sensor as set forth in claim 1, wherein the second flexible parts are hinges having a thickness in one axis direction and having a surface formed in the other axis direction.

11. The acceleration sensor as set forth in claim 10, wherein the second flexible parts are hinges having a thickness in an X axis direction and having a surface disposed along a Y axis and a Z axis.

12. The acceleration sensor as set forth in claim 1, wherein the second flexible parts connect the first mass body and the frame and connect the second mass body and the frame, in a Y axis direction.

13. The acceleration sensor as set forth in claim 1, wherein the second flexible parts have a hinge shape having a rectangular cross section or a torsion bar shape having a circular cross section.

14. An angular velocity sensor, comprising:

a mass body part comprising a first mass body and a second mass body;

an internal frame supporting the first mass body and the second mass body;

first flexible parts each connecting the first mass body and the second mass body to the internal frame;

second flexible parts each connecting the first mass body and the second mass body to the internal frame,

an external frame supporting the internal frame;

a third flexible part connecting the internal frame and the external frame; and

a fourth flexible part connecting the internal frame and the external frame,

wherein the second flexible parts are connected to the first mass body and the second mass body so as to be spaced apart from the centers of gravity of the first mass body and the second mass body,

wherein the first flexible parts have a width W1 in a Y-axis direction larger than a thickness T1 in the Z-axis direction, and

wherein the second flexible parts have a width W2 in a Z-axis direction larger than a thickness T2 in the X axis direction.

15. The angular velocity sensor as set forth in claim 14, wherein the first flexible parts and the second flexible parts are disposed in a direction perpendicular to each other.

16. The angular velocity sensor as set forth in claim 14, wherein the third flexible part and the fourth flexible part are disposed in a direction perpendicular to each other.

17. The angular velocity sensor as set forth in claim 14, wherein the third flexible part is disposed in a direction perpendicular to the first flexible parts.

18. The angular velocity sensor as set forth in claim 14, wherein the fourth flexible part is disposed in a direction perpendicular to the second flexible parts.

19. The angular velocity sensor as set forth in claim 14, wherein the first flexible parts are beams having a surface formed by one axis direction and the other axis direction and a thickness extending in a direction perpendicular to the surface.

20. The angular velocity sensor as set forth in claim 19, wherein the first flexible parts have a thickness in a Z axis direction, and are beams disposed along a surface formed by an X axis and a Y axis.

21. The angular velocity sensor as set forth in claim 20, wherein the first flexible parts connect one end portion of the first mass body and the internal frame and connect one end portion of the second mass body and the internal frame, in the X axis direction.

22. The angular velocity sensor as set forth in claim 14, wherein one surface of the first flexible parts or the second flexible parts is provided with a sensing unit configured to sense displacement of the first mass body and the second mass body.

23. The angular velocity sensor as set forth in claim 14, wherein the second flexible parts are hinges having a thickness in one axis direction and having a surface formed in the other axis direction.

24. The angular velocity sensor as set forth in claim 23, wherein the second flexible parts are hinges having a thickness in an X axis direction and having a surface formed by a Y axis and a Z axis.

25. The angular velocity sensor as set forth in claim 14, wherein the second flexible parts connect the first mass body and the internal frame and connect the second mass body and the internal frame, in a Y axis direction.

26. The angular velocity sensor as set forth in claim 14, wherein the second flexible parts have a hinge shape having a rectangular cross section or a torsion bar shape having a circular cross section.

27. The angular velocity sensor as set forth in claim 14, wherein the third flexible part is a beam having a surface formed by one axis direction and the other axis direction and a thickness extending in a direction perpendicular to the surface.

28. The angular velocity sensor as set forth in claim 27, wherein the third flexible part has a thickness in a Z axis direction, is a beam configured of a surface formed by an X axis and a Y axis, and is formed so as to have a width W₃ in an X axis direction larger than a thickness T₃ in the Z axis direction.

29. The angular velocity sensor as set forth in claim 14, wherein the fourth flexible part is a hinge having a thickness in one axis direction and having a surface formed in the other axis direction.

30. The angular velocity sensor as set forth in claim 29, wherein the fourth flexible part is a hinge having a thickness in a Y axis direction and having a surface formed by a X axis and a Z axis.

31. The angular velocity sensor as set forth in claim 29, wherein the fourth flexible part is formed so as to have a width W₄ in a Z axis direction larger than a thickness T₄ in a Y axis direction.

32. The angular velocity sensor as set forth in claim 14, wherein the fourth flexible part is disposed so as to correspond to the centers of gravity of the first mass body and the second mass body.

33. The angular velocity sensor as set forth in claim 14, wherein one surface of the third flexible part or the fourth flexible part is provided with a driving unit configured to drive the internal frame.

34. The angular velocity sensor as set forth in claim 33, wherein the internal frame is configured to rotate based on an axis having the fourth flexible part coupled thereto, with respect to the external frame, in response to the internal frame being driven by the driving unit.

35. The angular velocity sensor as set forth in claim 34, wherein the third flexible part is configured to generate bending stress and the fourth flexible part is configured to generate torsion stress, in response to the internal frame being rotated based on the axis having the fourth flexible part coupled thereto.

36. The angular velocity sensor as set forth in claim 34, wherein the first mass body and the second mass body are configured to rotate based on an axis having the second flexible parts coupled thereto, with respect to the internal frame, in response to the internal frame being rotated based on the axis having the fourth flexible part coupled thereto.

37. The angular velocity sensor as set forth in claim 36, wherein the first flexible parts generate bending stress and the second flexible parts generate torsion stress, in response to the first mass body and the second mass body being rotated.

38. The angular velocity sensor as set forth in claim 14, wherein the first mass body and the second mass body have one end having the first flexible parts each connected thereto and have the other end portions having the second flexible parts each connected thereto.

39. The angular velocity sensor as set forth in claim 38, wherein the first mass body and the second mass body have one end having the first flexible parts each connected thereto with respect to an X axis direction and have the other end portions having the second flexible parts connected thereto in aY axis direction with respect to the X axis direction.

40. The angular velocity sensor as set forth in claim 38, wherein the first mass body and the second mass body face each other so that coupling parts having the second flexible parts each coupled thereto are adjacent to each other rather than coupling parts having the first flexible parts each coupled thereto.