JPS61155811A - Rotary oscillation driving device - Google Patents

Abstract

PURPOSE:To reduce the size and to improve the reliability by providing a rotary oscillation member which has plural supporting parts radially, and providing the plural supporting parts with bases and bodies as objects of rotary oscillation at specific intervals. CONSTITUTION:A ring laser gyro 10 has its center part supported on a base 12 through a nearly circular rotary oscillation member 11 and is arranged so as to initiate specific rotary oscillation around its input shaft. This member 11 is provided with the 1st and the 2nd supporting parts 13 and 14 radially by turns and an expansion/contraction element (piezoelectric element) 15 for rotary oscillation which is polarized in a specific direction is stuck on respective intermediate parts between those supporting parts 13 and 14. The member 11 has a base fitting part 17 formed atop of the supporting part 14 and a fitting part 17 for an object body of rotary oscillation is formed at the tip part of the supporting part 14. The fitting part 16 is fitted to the base 12 by using a fitting member 18 and the fitting member 17 is fitted to the ring laser gyro 10 by using the member 18. Thus, a desired natural oscillation frequency is obtained even when the supporting parts 13 and 14 are made thick.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rotation system that is used to apply a predetermined minute rotational vibration input by rotating a Ringlade gyro for detecting angular velocity around its input shaft. The present invention relates to a vibration drive device.

[Technical background of the invention]

In general, a Lingle de gyro uses three or more reflecting mirrors to bend light, and an optical circuit is formed by adjusting the reflecting mirrors so that the light passes through an optical path formed in a closed circuit. ing. and.

In a closed optical circuit like this, by oscillating the radar, there is light traveling in one direction of the closed circuit and light traveling in the opposite direction.

When an angular velocity is applied to the rotation in the direction perpendicular to the plane (input axis) created by the closed circuit, a difference occurs in the oscillation frequency of the light traveling in the two directions due to the 8agnaa effect. . Since the magnitude and sign of this oscillation frequency difference correspond to the magnitude and direction of the angular velocity applied to the input shaft rotation, the angular velocity is detected from this oscillation frequency difference.

By the way, the above-mentioned Lingle de gyro has an input shaft m, for example.
When the angular velocity of b is small, the difference in the oscillation frequencies of light traveling in two directions is small; if the difference in oscillation frequencies is too small, the two oscillation frequencies are pulled into a predetermined common frequency, a so-called lock. The in phenomenon occurs and the frequency difference disappears. For this reason, when the input angular velocity is low, Ringrad Gyro can obtain a frequency difference that is smaller than the frequency difference according to the input angular velocity, or the frequency difference is zero, making it difficult to detect the angular velocity. A device is used to apply minute and stable rotational vibrations to the input shaft rotation, thereby providing an angular velocity above the threshold angular velocity at which the lock-in phenomenon occurs.

FIG. 4 shows the rotary vibrating member 1 of the rotary vibrating drive device. Part 3
A second support member 4 for attaching a ringlet gyro, which is a rotating vibrating body, is integrally provided through the second support member 4 . Further, a rotary drive extensible element 5 called a piezo element is attached to each of the plurality of spoke parts 3 . The elastic element 5 is polarized in a predetermined direction, and when an electric signal having a frequency equal to or near the mechanical natural frequency of the rotary vibration shaft is applied, the elastic element 5 is elastically deformed, and the spoke portion 3 The second support member 4 is rotated and vibrated through the support member 4.

[Problems with background technology]

However, in the above rotary vibration drive device, the slide portion 3
Since the length is the radius of rotation of the rotational vibration motion, if the length of the spoke part 3 is shortened in order to promote miniaturization, the thickness will be reduced accordingly to the desired approximately 350 to 40 mm.
It is difficult to obtain a natural frequency of 0 Hz and an amplitude of about 2 to 3 minutes, and the manufacturing thereof is complicated and expensive. Further, according to this, the stress generated in the spoke portions 3 inevitably becomes large, so there is also a problem that the reliability and durability thereof are inferior.

[Purpose of the invention]

This invention has been made in view of the above circumstances, and is a rotary vibration drive device that has a simple configuration, can promote miniaturization as much as possible, and can improve manufacturability, reliability, and durability. The purpose is to provide money.

[Summary of the invention]

That is, the present invention includes a rotary vibrating member in which a plurality of support parts are provided radially, and by attaching a base and a rotating vibrating body to the plurality of support parts at predetermined intervals, it is possible to effectively The intended purpose was achieved by configuring the rotary vibration to have a long radius of rotation.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Figures 1(a) and 1(b) show a rotary vibration drive device according to the present invention; Figure 1(a) is a plan view, and Figure 1(a) is a plan view;
b) is a sectional view. In the figure, numeral 10 denotes a rotating vibrating body, such as a ringlet gyro. This Ringlade gyro 10 is supported at its substantially central portion by a base 12 via a substantially circular rotational vibration member 11, and is arranged so that a predetermined rotational vibration is applied to its input shaft. has been done. As shown in FIG. 2, this rotary vibrating member 11 is provided with a plurality of first and second support parts 13.14 arranged radially, for example, alternately, and between each of the first and second support parts 13.14. For example, an elastic element (piezoelectric element) 15 for rotational driving called a piezo element, which is polarized in a predetermined direction, is attached to each of the parts. Further, the rotary vibration member 11 has a base mounting portion 16 formed at the tip of the first support portion 13, and the second
A rotating vibrating body mounting portion 17 is formed at the tip of the support portion 14 . The base mounting part 16 is attached to the base 12 using the mounting member 18, and the rotating vibrating body mounting part 1
1 is attached to the ringlet gyro 10 using a mounting member 18.

That is, in the rotary vibration drive device, an electrical signal having a mechanical natural frequency of the rotary vibration shaft or a predetermined frequency close to it is applied from a control section (not shown) to the elastic element 15, and the elastic element 15 is caused to expand or contract. Let it be controlled. Then,
As this elastic element 15 expands and contracts, the first and second
The support portions 13 and 14 of the ring are bent and deformed as shown in FIG. 3, and rotational vibration is applied to the input shaft 9 of the ringlet gyro 100. In this case, the rotational vibration amplitude Δθ given by the Lingle de gyro 10 is as follows with respect to the base 12, assuming that the amplitude of the first support portion 13 is Δθl and the amplitude of the second support portion 14 is Δθ. Δθ; Δθ1+Δθ.

This is the result.

In this way, the rotary vibration drive device has a plurality of first and second support parts 13, 14 arranged radially in an alternating manner, and a base 12 at each tip of the first and second support parts 13, 14. Since it is configured so that the ring ray degyros 10 and 10 are attached alternately, it is possible to obtain a radius of rotation of rotational vibration that is the sum of the first support part 13 and the second support part 14,
The effective rotation radius of rotational vibration can be made as long as possible. According to this, it is possible to obtain a desired natural frequency even if the thickness of the first and second support parts 13, 14 is increased, so that miniaturization can be effectively promoted and Since the stress generated can be reduced, manufacturability, reliability, and durability can be improved.

Furthermore, in the above embodiment, the first and second support parts 1 each have a base mounting part 16 and a rotating vibrating body mounting part 11.
Although the description has been made on the case where the 3.14s are arranged alternately one by one, the present invention is not limited to this, and substantially the same effect can be expected even if the arrangement is such that they are arranged every two or more, for example.

It goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As detailed above, according to the present invention, with a simple configuration,
It is possible to provide a rotary vibration drive device that can be miniaturized as much as possible and that can improve manufacturability, reliability, and winter resistance.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing a rotary vibration drive device according to an embodiment of the present invention, and FIG. 2 is a diagram of '1!' in FIG. 1! FIG. 3 is a state diagram for explaining the operation of FIG. 1, and FIG. 4 is a configuration diagram showing main parts of a conventional rotary vibration drive device. DESCRIPTION OF SYMBOLS 10... Lingle de gyro, 11... Rotating vibration member, 12... Base, 13... First support part, 14
...Second support part, f5-...Expansion element, 16-...
・Base mounting part, 17...Rotated vibrating body mounting part, 18.
...Mounting parts.

Claims (1)

[Claims] A rotary vibrating member having a plurality of support portions provided in a radial manner, an elastic element for rotational driving each attached to a substantially intermediate portion of the support portions of the rotary vibrating member, and a predetermined spacing between the support portions. A rotary vibration drive device comprising: a base supported by a distal end portion of the support portion; and a rotary vibrating body supported by another distal end portion of the support portion that is not supported by the base.