JP4668752B2 - Vibrating gyro - Google Patents

Description

  The present invention relates to a vibrating gyroscope that detects angular velocity.

  In recent years, research on miniaturization of gyroscopes has progressed, and the vibration body is excited by the piezoelectric effect. Although the downsizing of the vibrating gyroscope to be detected is remarkable, further downsizing is required so as not to limit downsizing of the applied equipment.

  A vibration gyro using such vibrations cannot achieve accurate sensing unless the internal vibration system used for sensing is thoroughly separated from external vibrations and strong forces. For this reason, high-performance vibration gyros generally have to be equipped with a large-scale suspension mechanism for separating external vibrations and violent forces from internal vibration systems. This is a major factor that hinders gyro miniaturization.

  A plurality of vibrations used by the vibrating body are referred to as an internal vibration system, and a vibration when the vibration gyroscope is vibrated from the outside or receives a strong force is referred to as an external vibration. The following shows an example of separating external vibration and internal vibration systems using a suspension.

  Patent Document 1 discloses a mechanism for separating an external vibration and an internal vibration system. The vibrator 1 is formed integrally with the frame-shaped base 20 so as to be surrounded by the frame-shaped base 20. An endless belt-shaped vibration-proof rubber 21 is wound around the frame-shaped base 20. The anti-vibration rubber 21 is wound around the frame base 20 and is sandwiched between the casing body 31 and the cover 32. It has been shown that external shocks and vibrations can be prevented from being absorbed by the anti-vibration rubber 21 and transmitted to the frame-shaped base 20, and the performance of the vibration gyroscope can be improved.

Patent Document 2 discloses a mechanism for separating external vibration and internal vibration system. The base 1 of the vibrator is joined to and supported by a frame-type gimbal body 17 having a flexible structure after a weight 17 is joined. It has been shown that external shock and vibration can be prevented from being absorbed by the frame-type gimbal body 17 and transmitted to the outside, and the performance of the vibration gyroscope can be improved.
Japanese Patent Laid-Open No. 08-178669 (FIG. 1) JP 2000-213942 (FIGS. 1 and 3)

  However, since the conventional frame structure is a closed structure, it is generally highly elastic, not suitable for loose support, and the frame structure itself does not have a damper function so that the vibration of the frame structure itself is damped. It is not. In addition, the closed frame structure cannot be a flexible structure against impacts from all directions.

  The purpose of the present invention is to solve the above-mentioned problems, and gently cushions against violent forces and vibrations from all directions, more gently cushions in specified directions, attenuates external vibrations, It is to realize a high-performance vibration gyro that separates external vibration and internal vibration systems.

  In order to solve the above object, the vibration gyro of the present invention employs the following configuration.

A vibrator having a plurality of legs, a base, and a support section, a housing for housing the vibrator, and preventing unnecessary vibration from being transmitted to the vibrator, and a joint bonded to the support section. in the vibrating gyroscope having vibration and the member, wherein the vibration isolating member is formed in a frame shape having a spring property and having an opening on at least a portion, and is fixed to the casing via a resilient member The open portion is formed at a position excluding a region joined to the support portion in the vibration isolation member .

  With this configuration, it is possible to moderately buffer strong forces and vibrations from all directions, and to realize a high-performance vibration gyro that attenuates external vibrations and separates external vibrations and internal vibration systems.

Further, the structure of this has the effect of damping vibrations from a direction parallel to a plane containing the plurality of legs.

  In addition, the vibrator has an outer peripheral surface substantially orthogonal to a plane including the plurality of legs, and the vibration isolating member so that the outer peripheral surface faces the inner peripheral surface of the vibration isolating member. It is arranged in the area of the enclosed space. With this configuration, the vibration gyro can be reduced in size without providing a useless space.

  Further, the open portion is formed at a position facing the tip of the leg portion of the vibrator. With this configuration, an effect of attenuating vibrations in a direction perpendicular to the longitudinal direction of the vibrator can be realized.

  In addition, the open portion is formed at a position facing the outer peripheral surface except for the tips of the support portion and the leg portion. With this configuration, an effect of attenuating vibrations in the longitudinal direction of the vibrator can be realized.

  The vibrator is a member separate from the vibration isolating member, and the support portion is fixed to the vibration isolating member. With this configuration, it is possible to realize an optimal vibration isolation effect without being limited to the same material as that of the vibrator.

  In addition, a plurality of the elastic members are provided between the vibration isolation member and the housing, and support the vibration isolation member with a predetermined interval.

  With this configuration, compared to the case where all the portions of the elastic member are supported by the vibration isolating member, the stress displacement of the elastic member desired to be used can be expressed without being obstructed by the vibration isolating member.

  The vibration-proof member is formed in a substantially rectangular shape having four corners, and the elastic member is disposed at the positions of the four corners.

  With this configuration, the stress displacement of the elastic member is performed in a well-balanced manner without concentrating on a part of the elastic member, and a vibration isolation effect can be efficiently expressed.

  The elastic member is a rubber damper or a silicone agent. With this configuration, it is possible to achieve an anti-vibration effect with a high vibration attenuation rate.

  Further, the vibration-proof member is a metal tungsten having a large specific gravity. With this configuration, the vibration on the vibrator side can be hardly transmitted to the outside.

According to the present invention, a high-performance vibration gyro that can gently buffer strong forces and vibrations from all directions including a specified direction, attenuate external vibrations, and separate external vibrations from internal vibration systems. Can be realized.

  Hereinafter, an embodiment according to the best mode for carrying out a vibrating gyroscope of the present invention will be described with reference to the drawings. 1 to 5 show a vibration gyro according to an embodiment of the present invention in which an external vibration and an internal vibration system are separated. FIG. 1 is a perspective view showing an external appearance of a vibration gyro according to a first embodiment in which an external vibration and an internal vibration system are separated. FIG. 2 is a plan view of the vibration gyro in which an external vibration and an internal vibration system are separated. FIG. 3 is a plan view showing a configuration of a tuning fork, and FIG. 4 is a plan view of a vibration gyro according to a second embodiment in which an external vibration and an internal vibration system are separated. FIG. 5 is a plan view of a vibration gyro according to a third embodiment in which an external vibration and an internal vibration system are separated.

(First embodiment)
In the present embodiment, a configuration of a vibration gyro capable of separating the external vibration and the internal vibration system and improving the performance of the vibration gyro will be described. A vibrating gyroscope is a device that measures this rotational speed by accurately detecting new vibration proportional to this rotational speed generated in the vibrator when the vibrator vibrating in a certain direction rotates. The vibration used is called internal vibration, and the vibration when the vibration gyroscope is vibrated from the outside or receives intense force is called external vibration.

  Intense force can be regarded as a collection of vibrations with many frequencies. It is obvious that the rotational speed is not measured when the internal vibration and the external vibration are combined or resonated.

  FIG. 1 shows a configuration of a vibration gyro 1 in which an external vibration and an internal vibration system described in this embodiment are separated. The vibration gyro 1 includes a vibrator 2 that is a vibrating body capable of exciting self-excited oscillation with a high Q value with high accuracy and exciting detected vibrations by the Coriolis force acting on the system, and a housing in which the vibrator 2 is housed. 30 and a support structure capable of separating the vibration system of the vibrator 2 from the outside.

  This support structure includes vibration isolating members 10, 40, and 50 and elastic members 20, 21, 22, and 23, which will be described later. Although not shown in FIG. 1, the casing 30 has a box shape from which one face of a hexahedron is removed, and the vibrator 2 is attached to an attachment surface 31 inside the casing 30.

  Various vibrators having various shapes have been proposed and actually applied to the vibrator used in the vibrating gyroscope 1. In this embodiment, a cantilever vibrator having a cantilever structure that is most advantageous for downsizing is used. There are various types of vibrators with a cantilevered tuning fork shape, such as the number of legs of a tuning fork and whether or not it has a planar structure. In this embodiment, the shape of the vibrator makes it easy to explain the structure. The case of a planar two-leg tuning fork where the effect of the invention is most significant will be described.

  FIG. 3 shows a tuning fork type vibrator 2 used as a vibrating body. The vibrator 2 includes a leg 3, a base 4, and a support 5. The leg 3 is a vibrating part that performs driving and detection, and a base 4 that is the base of the leg 3 supports the leg 3, and The vibration of the leg 3 is continued with the displacement. The support portion 5 extending from the base portion 4 is a portion with little distortion when the vibrator 2 is displaced by vibration, and is used for connection to the outside.

  The vibrator 2 includes an outer peripheral surface 2a in a direction (Z direction) perpendicular to the in-plane (YX plane) including the two legs 3.

1 and 2 show a support structure which is a key part of the configuration of the present invention. This support structure
A vibration isolating member 10 having a spring structure that also serves as a weight and elastic members 20 to 23 that are flexible connection portions to the housing 30, and the vibrator 2 is joined to the vibration isolating member 10.

The vibration isolation member 10 is a metal plate having a large specific gravity and a spring property, and has a size that can gradually surround the vibrator 2 and a substantially ring shape. However, a part of the opening is opened by the opening 11, and as a result, it has a substantially rectangular shape with four corners bent rather than a ring. Vibrator 2 is disposed on the inner peripheral surface 10a and so as to face, in the area of the surrounding space surrounded by the vibration isolating member 10 of the outer circumferential surface 2a is vibration isolating member 10.

  Thereby, size reduction of the vibration gyroscope 1 is realizable, without providing a useless space. The opening 11 is formed at a position facing the tip of the leg 3 of the vibrator 2. Thereby, the effect of attenuating vibration in a direction (X direction) orthogonal to the longitudinal direction (Y direction) of the vibrator 2 can be realized.

  The elastic members 20 to 23 are soft rubber-like flat plates. Moreover, you may comprise the elastic members 20-23 with a silicone agent. As a result, it is possible to achieve a vibration isolation effect with a high vibration damping rate. Further, tungsten having a large specific gravity is suitable for the vibration isolation member 10. Thereby, it can be set as the structure which is hard to transmit the vibration by the side of a vibrator to the exterior.

1 and 2, a support 5 of the vibrator 2, anti-vibration part of the member 10 to be fixed with an epoxy adhesive, the vibration isolator 10 of the housing 30 via the elastic member 20 to 23 The state of being attached to the attachment surface 31 is shown.

  In this configuration, the vibrator 2 has a large support mechanism that stabilizes vibration with respect to the vibrator 2 by fixing the support portion 5 to the vibration isolation member 10 having a larger overall size than the whole size of the vibrator 2. Can be acquired. In other words, the displacement from the outside can be attenuated by the elastic members 20 to 23, but in the direction (Z direction) perpendicular to the longitudinal direction (Y direction) of the leg 3 of the vibrator 2, the vibration isolating member 10 is further deformed. The effect is synergistic and a suspension mechanism is realized.

  Further, the vibrator 2 and the vibration isolating member 10 are constituted by different members. Thereby, the optimal anti-vibration effect can be realized without limiting the material of the anti-vibration member 10 to the same material as that of the vibrator 2. Further, the elastic members 20 to 23 are disposed at the positions of the four corners at a predetermined interval, and support the vibration isolation member 10.

  As a result, the stress deformation of the elastic member can be efficiently expressed without concentrating on a part, and furthermore, the balance of the vibration isolating member can be maintained with a good balance, so that the displacement of the vibration isolating member due to acceleration can be made even, A part of the vibration isolating member does not extend due to a large variation.

(Second Embodiment)
Next, a second embodiment of the present invention is shown in FIG. In the present embodiment, only the configuration different from the first embodiment will be described, and the same configuration will be omitted. A different configuration from the first embodiment is that holes 42, 43, 44, 45 are provided in the vibration isolating member 40 having the opening 41. With this configuration, the vibration constant member 40 can be made into a gimbal shape and the spring constant can be reduced.

(Third embodiment)
Next, a third embodiment of the present invention is shown in FIG. In the present embodiment, only the configuration different from the first embodiment will be described, and the same configuration will be omitted. The configuration different from the first embodiment is that the position of the opening 51 in the vibration isolator 50 is formed at a position facing the outer peripheral surface 2 a excluding the support 5 and the tip of the leg 3 in the vibrator 2. is there. That is, the direction in which the vibration isolator 10 is easily bent is the longitudinal direction (Y direction) of the vibrator 2.

  With this configuration, the vibrator 2 has a large support mechanism that stabilizes vibration with respect to the vibrator 2 by fixing the support portion 5 to the vibration isolating member 10 having a larger overall size than the whole size of the vibrator 2. Can be acquired. That is, the displacement from the outside can be attenuated by the elastic members 20 to 23, but the effect of the deformation of the vibration isolating member 10 is further synergized with respect to the longitudinal direction (Y direction) of the leg 3 of the vibrator 2 to realize a suspension mechanism. is doing.

  In the present embodiment, the opening 51 is formed on the left side of the vibrator 2, but the same effect can be obtained even if it is formed on the right side of the vibrator 2.

  On the other hand, in the vibrating gyroscope 1, a piezoelectric body is used for the vibrator 2 as a vibrating body in order to generate a driving vibration and detect a detected vibration, and an electronic device for detecting a vibrating body drive provided on the housing 30 side. A circuit (not shown) and the vibrating body must be electrically connected to exchange signals necessary for them.

  The tuning fork vibrator 2 used in the first to third embodiments is made of crystal and needs to exchange a very small but accurate current with an electronic circuit. Further, in the configuration shown in the first to third embodiments, the vibrator 2 is displaced relative to the housing 30, so that although not shown here, the vibrator 2 and the electronic circuit on the housing 30 For electrical connection, it is preferable to connect by wire bonding, which is an electrical connection method that allows mechanical displacement.

In addition, when the opening part of the vibration isolator shown in the first and third embodiments is formed at a position facing the tip of the leg of the vibrator, and when it is formed at a position facing the side face of the vibrator However, it may be formed at a position other than these positions, excluding the region of the vibration isolation member joined to the support portion of the vibrator.

  In the first to third embodiments, the vibrator and the vibration isolating member are separated from each other, and the vibrator leg is fixed to the vibration isolating member so that the leg portion and the support portion are substantially at the same height from the vibration isolating member. The case where it adjoined to the vibration member was demonstrated. However, the present invention is applied even when the vibrator is separated from the vibration isolating member so that the leg portion and the support portion of the vibrator are not at the same height from the vibration isolating member and the leg portion is higher. Needless to say.

1 is a perspective view showing an appearance of a vibration gyro according to a first embodiment of the present invention in which an external vibration and an internal vibration system are separated. It is a top view of the vibration gyro which isolate | separated the external vibration and internal vibration system which are the 1st Embodiment of this invention. It is a top view which shows the structure of the tuning fork which is embodiment of this invention. It is a top view of the vibration gyro which isolate | separated the external vibration and internal vibration system which are the 2nd Embodiment of this invention. It is a top view of the vibration gyro which isolate | separated the external vibration and internal vibration system which are the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibrating gyro 2 Vibrator 2a Outer peripheral surface 3 Leg part 4 Base 5 Support part 10, 40, 50 Anti-vibration member 10a Inner peripheral surface 11, 41, 51 Opening part 42, 43, 44, 45 Hole 20, 21, 22, 23 Elastic member 30 Housing 31 Mounting surface

Claims (10)

A vibrator having a plurality of legs, a base, and a support section, a housing for housing the vibrator, and preventing unnecessary vibration from being transmitted to the vibrator, and a joint bonded to the support section. A vibrating gyroscope having a vibrating member,
The vibration-proof member is formed in a frame shape having an open portion at least in part and having spring properties, and is fixed to the housing via an elastic member ,
The opening portion is formed at a position excluding an area where the vibration isolating member is joined to the support portion . The vibrator has an outer peripheral surface substantially orthogonal to a surface including the plurality of legs, and is surrounded by the vibration isolation member so that the outer peripheral surface faces the inner peripheral surface of the vibration isolation member. The vibrating gyroscope according to claim 1, wherein the vibrating gyroscope is disposed in a region of the enclosed space. The opening portion is vibrating gyroscope according to claim 1 or claim 2, characterized in Tei Rukoto formed at a position facing the tip of the legs of the vibrator. The vibrating gyroscope according to claim 1 or 2 , wherein the opening portion is formed at a position facing the outer peripheral surface except for the tips of the support portion and the leg portion. The vibrator is another member and the vibration isolating member, the vibration gyro according to claim 1, any one of 4 to the supporting portion, characterized in Tei Rukoto fixed to the vibration isolating member. The elastic member, together with the provided plurality between said vibration isolating member and the housing, one of claims 1, characterized in that for supporting the anti-vibration member at a predetermined distance of 5 The vibrating gyroscope according to claim 1. The vibration isolator according to claim 6 , wherein the vibration isolating member is formed in a substantially rectangular shape having four corners, and the elastic member is disposed at the positions of the four corners. The vibrating gyroscope according to claim 1, wherein the elastic member is a rubber damper. The vibrating gyroscope according to claim 1, wherein the elastic member is a silicone agent. The anti-vibration member, the vibration gyroscope according to any one of claims 1 9, characterized in that the tungsten large metal specific gravity.

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