JPH0442948Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a ring laser gyroscope used for detecting rotational angular velocity.

[Technical background of the invention] Generally, in a ring laser gyroscope, an optical circuit is formed by bending light using three or more reflecting mirrors and passing the light through an optical path formed in a closed circuit. In such a closed optical circuit, by oscillating a laser, there is light traveling in one direction of the closed circuit and light traveling in the opposite direction, and light traveling in the opposite direction is created. When angular velocity is given around the direction (input axis),
The Sagnac effect causes a difference in the oscillation frequency of light traveling in two directions. Since the magnitude and sign of this oscillation frequency difference correspond to the magnitude and direction of the angular velocity applied around the input shaft, the rotational angular velocity is detected from this oscillation frequency difference.

By the way, in the above-mentioned ring laser gyroscope, the reflecting mirror and He-Ne gas that make up the optical circuit deteriorate due to moisture, outgas, etc. generated in the optical circuit, so as a means to prevent this, a protection called a getter is used. The member is disposed within the optical circuit and is adapted to absorb the moisture, outgas, and the like.

[Problems in the Background Art] However, in the ring laser gyroscope described above, the protective member easily shifts its position due to vibrations caused by the operation of the device or shocks caused by the scattering of moisture, outgas, etc. This poses a problem in that it obstructs or stains the reflector.

[Purpose of the invention] This invention was made in view of the above circumstances, and the purpose is to provide a ring leather gyroscope that has a simple structure and that can improve the reliability of operation as much as possible. purpose.

[Summary of the invention] That is, this invention uses a cell having a substantially ring-shaped fixing part with a partial notch as a protective member, and is configured to improve mechanical strength. The desired purpose was achieved by improving the strength against vibrations caused by the dissipation of heat generated by barium, etc.

[Embodiments of the invention] Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

Fig. 1 shows a ring laser gyroscope according to an embodiment of this invention, and 10 in the figure is a so-called so-called
This is a substantially annular glass block that is made up of a He--Ne laser discharge tube. This glass block 10 has, for example, first and second concave reflecting mirrors 1 at its four corners.
1, 12 and first and second plane reflecting mirrors 13, 14
A ring resonator 15 is constructed, in which, for example, the first plane reflecting mirror 13 is provided with a light mixing prism 16 for extracting light. Further, the glass block 10 is provided with first and second anodes 17 and 18 facing each other at both ends thereof,
A cathode 19 is provided in the middle. Inside the glass block 10, a protective member 20 called a getter for absorbing moisture, outgas, etc. corresponds to the first and second concave reflecting mirrors 11 and 12 and the first and second flat reflecting mirrors 13 and 14. It will be established as follows. As shown in FIG. 2, this protection member 20 is supported by a cell 21 made of a metal material having a predetermined toughness in a high temperature state. The cell 21 has a notch 26
A substantially ring-shaped fixing part 22 is formed, and this fixing part 22 has first, second, and third arm parts 2.
3, 24, and 25 are formed. The protection member 20 is attached to each tip of the first, second, and third arm portions 23, 24, and 25.

In the above configuration, the protective member 20 heats and scatters barium etc. by high-frequency heating as the device is operated, absorbs moisture, outgas, etc. generated in the glass block, and absorbs He-Ne gas and the first and second glass blocks. This prevents deterioration of the second concave reflecting mirrors 11 and 12 and the first and second flat reflecting mirrors 13 and 14. At this time, if the protection member 20 is subjected to shocks due to scattering of the barium or the like or vibrations of the device itself, the shock and vibrations are absorbed by the cells 21, and the protection member 20 is securely mounted at the predetermined mounting position. Retained. Moreover, since the fixing part 22 is provided with the notch 26, even if the protective member 20 is heated by high frequency, no eddy current is generated in the fixing part 22 due to the high frequency. Therefore, the fixing portion 22 can securely hold the protective member 20 without reaching a high temperature that causes it to lose its toughness (stickiness) or elasticity.

In this way, the ring laser gyroscope is configured so that the protective member 20 is arranged using the cell 21 having the substantially ring-shaped fixing part 22 with the notch 26, and the mechanical strength is improved. This effectively improves the strength against shocks caused by the dissipation of heat generated by barium, etc., and vibrations caused by the operation of the device.

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

[Effects of the invention] As detailed above, according to this invention, it is possible to provide a ring laser gyroscope which has a simple configuration and whose operation is as reliable as possible. .

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing a ring laser gyroscope according to an embodiment of the invention, and FIG. 2 is a detailed diagram showing the main part of FIG. 1. 10...Glass block, 11...First concave mirror, 12...Second concave mirror, 13...First plane mirror, 14...Second plane mirror, 15...Ring resonator, 16...Light mixing Prism, 17...first anode, 18...second anode, 19...cathode, 20...protective member, 21...cell, 22...
...Fixed portion, 23...First arm, 24...Second arm, 25...Third arm.

Claims (1)

[Scope of utility model registration request] A ring resonator in which an annular optical path is configured with three or more reflecting mirrors is oscillated with first and second lasers in mutually opposite directions, and the oscillation frequency generated by the first and second lasers is In a ring laser gyroscope that detects the rotation angle by measuring the difference between
A cell is provided with a protective member that faces the reflective mirror of the ring resonator at one end and prevents deterioration of the reflective mirror or laser medium at one end, and has a substantially ring-shaped fixing part having a partial cutout at the other end. A ring laser gyroscope characterized by: