JPH02268219A - Gyroscope apparatus - Google Patents

Abstract

PURPOSE:To prevent deterioration due to time change at high temperature and vibration shock and to improve reliability by determining the motional characteristics around the input shaft of a gyroscope with hinge deflecting parts which are provided at the center of the plate part of a hinge in place of an ordinary elastic members. CONSTITUTION:A detecting hinge 30 having a second hinge 40 is fixed to a base stage 44 by using hinge attaching holes 40-2 at three hinge attaching parts 40-1 and by using bolt 50-4 and spacer 40-5. At this time, hinge deflecting parts 40-3 have the functions of plate springs. The deflecting parts have a free angular resonance frequency which is determined by inertial efficiency and the spring constant of the deflecting part 40-3 around a shaft that passes through the center O of the three attaching parts 40-1 and is perpendicular to the surface of a plate part 30-5 of the hinge. Thus the function of an elastic member is provided in the deflecting part. Even if this apparatus is used at high temperature, deterioration in characteristics due to time change, vibration and shock can be prevented, and the highly reliable gyroscope apparatus can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gyro device (angular velocity detection device) using a tuning fork.
Regarding.

[Conventional technology]

In a conventional gyro device using a tuning fork, as shown in FIG.
1), (1-1), a flexible part (1-2) connected to each of these, (1-2), and both flexible parts (1-2)
, a base (1-3) connecting each free end of (1-2);
From this base (1-3), both flexible parts (1-2), (1-
2) A connecting part (1-4) that extends in the gap between the two without contacting them
) and more.

In addition, (30) is a detection hinge, and this detection hinge (3
0) is a central connecting portion (30-2), and strip-shaped hinge portions (30-1) and (30-3) extending from this to the left and right.
and the two strip-shaped f hinges, part (30-1), (3
0-3) and a base or plate part (30-5) that integrally connects and connects the free ends of the base plate (30-3). It is desirable that the hinge (30) be manufactured as a whole from a single plate by a method such as wire cutting. Further, the tuning fork (1) can also be produced from the plate part (30-5) by a method such as wire canting.

The rectangular hinge portions (30-1) and (30-3) include a tuning fork (1) with an angular velocity Ω input around the input shaft (Z-Z) of the tuning fork (1), and therefore a detection hinge (30). a piezoelectric element (31-1) for detecting deflection occurring in (
31-2) are fixed respectively. Also, a detection hinge (30
) is the connecting part (30-2) of the tuning fork (1).
4) is fitted into the U-shaped recess (1-4a).

In this case, the surface of the plate portion (30-5) of the detection hinge (30) is perpendicular to the tuning fork axis or the input axis (Z-Z). The plate portion (30-5) of the hinge includes cylindrical elastic members (42-1), (42-2), (42
-3) is fixed to the mounting base (44) via (42-4). In addition, in the above configuration, the center of gravity of the tuning fork (1) is located at both the rectangular hinge portions (3) of the detection hinge (30).
0-1), (30-3), that is, the connecting part (30-
It goes without saying that each part of the tuning fork (1) is designed so that it hits the center of 2). It is also possible to attach an electric circuit (46) such as a gyro signal detection circuit or a tuning fork drive circuit directly to the plate part (30-5) of the hinge as shown in the figure.

FIG. 3 is an explanatory diagram for explaining the principle of the conventional example shown in FIG. 2, and shows the main parts thereof as viewed from the axis (Z-2) direction in FIG. 2. As shown in the figure, when an angular velocity Ω is applied around the axis (2-2) to this gyro device, a corresponding Coriolis force Fc is applied to the two vibrating masses (1-IL).
(1-1) are generated in parallel and opposite directions to each other, and the resulting torque is applied to the connecting portion (30-2) of the detection hinge (30).
) through the strip-shaped hinge part (30-1), (30-3
) produces an S-shaped bending deformation as shown in the figure. In this case, a piezoelectric element (31-1).

(31-2) are fixed to the rectangular hinge parts (30-1) and (30-3), respectively, so that their polarization directions are in opposite directions, as indicated by + and - in the figure. Since it has been
Both piezoelectric elements (31-1) and (31-2) are short-circuited to form one output (45), which is converted into a voltage 1 shown in FIG.
By performing synchronous rectification with the voltage from (5a) and the demosulator (force), the input angular velocity Ω can be detected, and therefore a gyro device can be obtained.In addition, (4a), (4a
) indicates a piezoelectric element for driving the tuning fork (1).

Although not shown, an axis (Y-Y
) direction, the piezoelectric element (31-
The voltages induced at 1) and (31-2) have opposite signs, and there is no output from these.

Further, in order to avoid the influence of temperature, it is desirable to make the tuning fork (1) and the detection hinge (30) from a thermostatically elastic material.

Furthermore, in order to increase the detection sensitivity, the resonance frequency of the tuning fork (1), the inertia rate around the input axis CZ-Z of the tuning fork (1), and the hinge parts (30-1) and (30-3) must be adjusted. The torque spring constant around the input shaft <2-2) and the plate part of the hinge (
It is desirable that the free angle resonance frequency around the input shaft <2-2> determined by the inertia factor around the input shaft (Z-Z) of 30-5) is selected to be approximately the same value.

[Problem to be solved by the invention]

However, in such a conventional gyro device, the plate portion (30-5) of the detection hinge (30) is connected to the mounting base through the cylindrical elastic members (42-1) to (42-4). Since it has a structure fixed to the stand (44), when the gyro device is used in a particularly high temperature state, changes over time and vibrations of the cylindrical elastic members (42-1) to (42-4) can be avoided. .

There were problems in that the gyro function deteriorated due to impact and other factors, and the reliability was also low.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a novel gyro device that eliminates the above-mentioned conventional problems.

[Means to solve the problem]

According to the present invention, in a gyro device having a tuning fork and a detection section that detects a moment due to the Coriolis force generated on the tuning fork, a second hinge is provided approximately at the center of the plate-like member of the detection section. A gyro device is obtained.

[Effect]

At the center of gravity of the tuning fork (1), insert the detection hinge (
30) strip-shaped hinge parts (30-1), (30-3)
piezoelectric elements for detection (31
-1).

By attaching (31-2), the moment due to the Coriolis force generated on the tuning fork due to the angular velocity around the tuning fork axis is detected as the voltage of the piezoelectric element for detection. By rectifying this voltage synchronously with the driving voltage of the tuning fork, an angular velocity detection device, that is, a gyro device is formed. Further, a second plate portion (30-5) of the detection hinge (30) includes a hinge mounting portion (40-1) having a bending axis parallel to the tuning fork axis, and a hinge bending portion (40-3). By providing a hinge (40) and attaching it to the base (44) via the hinge attachment portion, a gyro device that does not use an elastic member such as rubber can be obtained.

〔Example〕

FIGS. 1A and 1B are a plan view of an embodiment of a gyro device according to the present invention and a side view of its main parts. Although not shown in the drawings, the other configurations are substantially the same as the conventional example shown in FIG. 2, so a detailed explanation thereof will be omitted.

The difference between the embodiment of the present invention shown in FIG. 1 and the conventional example shown in FIG. 2 is the configuration of the plate portion (30-5) of the detection hinge (30). That is, in the present invention, the detection hinge (30)
The plate portion (30-5) has a second hinge (40) approximately in the center thereof. This second hinge (40) extends radially outward from the center (0) of the plate part (30-5), and has three hinge attachment parts (40-1
).

Three hinge mounting holes (40-
2) and between the adjacent hinge attachment part (40-1),
It consists of three rectangular hinge bending parts (40-3) extending radially outward from the center (0). In addition, each of the above parts (4
0-1), (40-2), (40-3) are -
It is manufactured by connecting two plates, in this example, plate portion (30-5), by a method such as wire cutting or the like, as shown in FIG. 1A.

The detection hinge (3o) having the second hinge (40) has three hinge mounting portions (40-1), using their respective hinge mounting holes (40-2) and using the port l-( 40～
4) and the spacer (40-5), the base (44)
(see Figure 1B). In this case, each hinge bending portion (40-3) has the function of a temporary spring, so 3
Around the axis passing through the center (0) of the hinge mounting part (40-1) and perpendicular to the plane of the hinge plate part (30-5), that is, around the axis parallel to the gyro input axis CZ-Z) The inertia factor of the plate part (30-5) of the hinge and the bending part of the hinge (
40-3), and has a free angle resonance frequency determined by the spring constant of the elastic members (42-1) to (42-3) in the conventional example.
4) It has the function of

In addition, in the example of the present invention shown in FIG.
-3) and the hinge mounting portion (40-1) are each three, but there is no need to limit the number to three; for example, two
It may be 1 piece, 4 pieces, etc.

〔Effect of the invention〕

According to the present invention configured as described above, the conventional elastic member (42
-1") to (42-4), the hinge plate (30
-5) can determine the motion characteristics around the input axis of the gyro, so when the gyro device is used at particularly high temperatures, it is possible to This has the effect of eliminating deterioration of characteristics due to aging, vibration, impact, etc. that is observed in elastic members, reducing changes in gyro performance over time, and increasing reliability.

Furthermore, since the conventionally used elastic member is no longer necessary, material costs can be reduced, and a reduction in assembly man-hours and assembly time can be expected.

[Brief explanation of drawings]

1A and 1B are a plan view of an embodiment of the gyro device of the present invention and a side view of its main parts, FIG. 2 is a perspective view of a conventional example, and FIG. 3 is a route diagram for explaining its principle. . In the figure, (1) is a tuning fork, (30) is a detection hinge, and (3
0-1) (30-3) is the hinge part, (30-2) is the connecting part, (30-5) is the plate part, (40) is the second hinge, (
40-1) is a hinge mounting portion, (40-2) is a hinge mounting hole, and (40-3) is a hinge flexible portion. Figure 3 of υ Kenbanyama from the axis (Z-Z) direction of agent Hidemori Matsukuma Kiku 2rf3

Claims (1)

[Scope of Claims] 1. In a gyro device having a tuning fork and a detection section that detects a moment due to the Coriolis force generated on the tuning fork, a second hinge is provided approximately at the center of the plate-like member of the detection section. A gyro device characterized by being provided with. 2. The gyro device according to item 1, wherein the second hinge includes a hinge mounting portion, a hinge bending portion, and a hinge mounting hole provided in the hinge mounting portion.