JP3711536B2 - Ring laser gyro block and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ring laser gyro (RLG) block and a method of manufacturing the same, and more particularly to an RLG block having a good airtightness and workability of an annular optical path including a counterbore hole and a method of manufacturing the same.
[0002]
[Prior art]
The configuration and operation principle of the RLG will be described with reference to FIG.
A closed annular optical path 11 is formed in the glass block 1, a mixed gas composed of helium and neon is enclosed in the annular optical path 11, and the first cathode 24, the second cathode 25, and the anode 3 are installed to resonate. The device 10 is configured. By applying a voltage between these electrodes, a plasma discharge is generated in the annular optical path 11, and a clockwise CW laser beam and a counterclockwise CCW laser beam are transmitted along the annular optical path 11 to the semitransparent concave mirror 30 and the first plane. The light is propagated and circulated independently while being reflected by the mirror 32 and the second plane mirror 32. Reference numeral 13 denotes a counterbore hole, which is formed in a part of the annular optical path 11 from the viewpoint of securing a gas capacity as the laser resonator 10. Part of the CW laser light is transmitted through the semi-transmissive concave mirror 30 and retroreflected at the corner cube 34, reflected by the external semi-transmissive mirror 35, and incident on the photodetector 36. The CCW laser light passes through the semi-transmissive concave mirror 30 and the external semi-transmissive mirror 35 and is directly incident on the photodetector 36. The CW laser light and the CCW laser light interfere immediately before entering the photodetector 36 to generate interference fringes. The photodetector 36 detects this interference fringe.
[0003]
When the angular velocity ω is input with the center of the annular optical path 11 as an axis, the starting point of the light moves during one round of the laser light, so the time for the laser light to make one round of the annular optical path 11 is apparent. It is different. That is, the time apparently increases for laser light circulating in the same direction as the input angular velocity ω, and the time is apparently reduced for laser light circulating in the opposite direction to the input angular velocity ω. The time difference required for one round between the CW laser light and the CCW laser light appears as a frequency difference between the two laser lights. The previous interference fringes are generated due to the frequency difference between the two laser beams. The input angular velocity ω can be measured by analyzing the interference fringes.
[0004]
The block forming the closed annular optical path 11 is the glass block 1 as described above. The glass block 1 has an annular optical path 11 formed therein, and a cavity corresponding to the counterbore hole 13, the first cathode 24, the second cathode 25, and the anode 2 in communication with the annular optical path 11. It is formed. It is required that the cavity hold the mixed gas composed of helium and neon to be filled inside and hardly permeate and leak outside, and the holding characteristic of helium having a small atomic radius is particularly important. In other words, helium permeability is important for the life of ring laser gyros, and depending on the choice of block material, some glass materials do not satisfy the required life even if they are glassy and can be used as block materials. Glass materials are limited. Moreover, in order to suppress the fluctuation | variation of a cyclic | annular optical path length, a block material needs to be a material of a low thermal expansion coefficient, and the glass material which can be used is limited also by this point.
[0005]
On the other hand, in the glass block 1, the opening of the counterbore hole 13 where the semi-transmissive concave mirror 30 is bonded and fixed to the glass block 1 is compared with the diameter of the semi-transmissive concave mirror 30 to the extent that it does not hinder the bonding and fixing. Therefore, it is necessary to form a small diameter. By the way, the counterbore hole 13 needs to be configured as a hole having a small opening diameter but a large internal volume and a large internal volume. This is because the internal volume of the spot facing hole 13 cannot be made extremely small in order to secure the gas capacity of the annular optical path 11 beyond a certain required amount. The counterbore hole 13 is processed by the following steps.
[0006]
(Step 1) Using an ultrasonic drill, the glass block is crushed little by little and perforated.
(Step 2) Polish the inner wall of the drilled cavity.
(Step 3) The polished surface is etched and polished more smoothly.
[0007]
[Problems to be solved by the invention]
In step 1, which is a pulverization step, it is necessary to perform pulverization by exchanging various types of ultrasonic drills according to the processing location. And the process 2 and the process 3 which are grinding | polishing processes are processing processes which make the surface area of a cavity inner wall the minimum smoothness. Adsorption and desorption of gas on the surface of the cavity inner wall is an unavoidable phenomenon, so impure gas is released from the inside of the glass block into the cavity, or gas enclosed in the cavity is adsorbed on the cavity inner wall and mixed gas composition The surface of the cavity inner wall is smoothed from the viewpoint of avoiding the problem of causing changes. When all the steps 1 to 3 for producing one ring laser gyro glass block are performed, a processing time of about 40 to 50 hours is required including the replacement time of various types of ultrasonic drills.
[0008]
As described above, glass block processing has a number of problems in terms of the number of processing steps, processing time, and simplicity of processing itself, including the selection of glass raw materials, and these are the production of ring laser gyros. This is an obstacle to reducing costs.
In order to reduce the processing cost of the glass block, how to efficiently carry out the drilling process is an important issue. In order to extend the life of the ring laser gyro, it is necessary to securely hold the sealed mixed gas necessary for laser oscillation inside and prevent it from permeating and leaking outside. In particular, the permeability of helium with a small atomic radius becomes a problem. Here, in order to improve the workability of the glass block, if an attempt is made to use a ceramic material, which is a material excellent in workability, instead of glass, it is disadvantageous for the gas retention property.
[0009]
The present invention provides an RLG block that solves the above-described problems of airtightness of an annular optical path including a counterbored hole and good workability of the block, and a method for manufacturing the same.
[0010]
[Means for Solving the Problems]
Claim 1: Lower half block 1 formed symmetrically with respect to each other's butt surfaces and butt-joined_LAnd upper half block 1_UAnd a back glass tube 1 comprising a cavity 111 corresponding to the annular optical path, and cavities 130 and 131 corresponding to the counterbore holes communicating with the cavity 111 corresponding to the annular optical path, a cavity corresponding to the cathode opening, and a cavity corresponding to the anode opening._TWith lower block 1_LAnd upper half block 1_ULined glass tube 1_TA ring laser gyro block was constructed in which the three members were joined and fixed together.
[0011]
In the ring laser gyro block according to claim 2, the lower half block 1_LAnd upper half block 1_UThe two-part annular optical path 11 constituting the annular optical path 11 on both abutting surfaces_L,_UThe counterbore hole 13 constituting the counterbore hole 13_L,_UThe first cathode opening 240 is divided into two parts constituting the first cathode opening 240._L,_UAnd the second cathode opening 250 which constitutes the second cathode opening 250._L,_UThe two-minute anode opening 300 constituting the anode opening 300_L,_UThe counterbore hole-corresponding cavity is composed of a counterbore hole-corresponding cavity 131 and a second counterbore hole-corresponding cavity 130, and the second counterbore hole-corresponding cavity 130 is longer in length than the counterbore hole-corresponding cavity 131. A ring laser gyro block was constructed, characterized in that the outer tip was opened.
[0012]
Further, in the ring laser gyro block according to claim 3, the backing glass tube 1_TA ring laser gyro block having an opening formed by removing the exposed portion was constructed.
Further, in the ring laser gyro block according to any one of claims 1 to 3, the lower half block 1_LAnd upper half block 1_UConstituted a ring laser gyro block which is a molded product of ceramic or glass.
[0013]
According to a fifth aspect of the present invention, in the ring laser gyro block according to any one of the first to fourth aspects, the backing glass tube 1_TThe material constituting the ring laser gyro block was lead glass.
In this case, the bisecting annular optical path 11 constituting the annular optical path 11 is formed on both abutting surfaces._L,_UThe counterbore hole 13 constituting the counterbore hole 13_L,_UThe first cathode opening 240 is divided into two parts constituting the first cathode opening 240._L,_UAnd the second cathode opening 250 which constitutes the second cathode opening 250._L,_UThe two-minute anode opening 300 constituting the anode opening 300_L,_ULower half block 1 is formed_LAnd upper half block 1_UAre manufactured separately (step 1), the annular optical path corresponding cavity 111, the second counterbore hole corresponding cavity 130, the counterbore hole corresponding cavity 131, the first cathode opening corresponding cavity 241, the second cathode opening corresponding cavity 251, It comprises an anode opening corresponding cavity 301, the second counterbore hole corresponding cavity 130 has a longer overall length than the counterbore hole corresponding cavity 131, and only the outer tip of the second counterbore hole corresponding cavity 130 is opened. Lined glass tube 1_T(Process 2), lower half block 1_L, Lined glass tube 1_TUpper half block 1_UAre stacked in this order and joined to each other to produce a block semi-finished product (step 3)._TThe temperature of the back glass tube 1 is increased while pressurizing air through the opening of the second counterbore hole corresponding cavity 130._TIn the lower half block 1_LAnd upper half block 1_UThe inner surface of the glass tube 1 is heat-sealed and fixed (step 4)._TThe manufacturing method of the ring laser gyro block which consists of the process (process 5) which removes and exposes the exposed part of this was comprised.
[0014]
Further, claim 7: Lower half block 1 formed symmetrically with respect to each other but butt-joined_LAnd upper half block 1_UA back glass tube 1 comprising an annular optical path corresponding cavity 111 and a counterbore hole corresponding cavity 131 communicating with the annular optical path corresponding cavity, cathode opening corresponding cavities 241 and 251, and anode opening corresponding cavity 301._TWith lower block 1_LAnd upper half block 1_ULined glass tube 1_TIn the ring laser gyro block which is fixedly bonded to the three members by sandwiching them, the lower half block 1_LAnd upper half block 1_UIs made of low thermal expansion and helium gas impervious material, backed glass tube 1_TConstructed a ring laser gyro block composed of quartz glass.
[0015]
And, in the ring laser gyro block according to claim 8, the lower half block 1_LAnd upper half block 1_UThe two-part annular optical path 11 constituting the annular optical path on both abutting surfaces_L,_U, Half counterbore hole 13 constituting counterbore hole_L,_UIs formed, upper half block 1_U Further, a first cathode opening 240, a second cathode opening 250, and an anode opening 300 are formed, and the counterbore corresponding cavity comprises a counterbore hole corresponding cavity 131 and a second counterbore hole corresponding cavity 130. The double counterbore hole-corresponding cavity 130 has a longer overall length than that of the counterbore hole-corresponding cavity 131, and forms a ring laser gyro block having an outer end opened.
[0016]
Further, in the ring laser gyro block according to claim 9 of the present invention, a ring laser gyro block opened by removing the exposed portion of the backing glass tube is configured.
Furthermore, in the ring laser gyro block according to any one of claims 7 to 9, the lower half block and the upper half block further constitute a gas reservoir on both abutting surfaces. Thus, a ring laser gyro block having a gas reservoir corresponding to the annular optical path and a gas reservoir corresponding to the annular optical path is formed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the example of FIG. FIG. 1A is a perspective view of an embodiment of an RLG block, and FIG. 1B is a plan view of a lower half block of the RLG block of FIG.
In FIG. 1, RLG block 1 is lower half block 1_LAnd upper half block 1_UConsists of. Lower half block 1_LAnd upper half block 1_UIs configured in a shape structure that is completely plane-symmetric with respect to the mutual butting surfaces. This lower half block 1_LAnd upper half block 1_UThe two-part annular optical path 11 constituting the annular optical path 11 on both abutting surfaces_L,_UThe counterbore hole 13 constituting the counterbore hole 13_L,_UThe first cathode opening 240 is divided into two parts constituting the first cathode opening 240._L,_UAnd the second cathode opening 250 which constitutes the second cathode opening 250._L,_UThe anode opening 300 constituting the anode opening 300_L,_UIs formed. Lower half block 1_LAnd upper half block 1_UWhen the RLG block 1 is constructed by butt-joining each other, an annular optical path 11, a counterbore hole 13, a first cathode opening 240, a second cathode opening 250, and an anode opening 300 are formed inside the RLG block 1. Is done.
[0018]
Referring to FIG. 2, this is an exploded perspective view of the RLG block, showing the relationship between the RLG block of FIG. 1 and the backing glass tube of the present invention. 2A is a perspective view of the upper half block, FIG. 2B is a perspective view of the backing glass tube, and FIG. 2C is a perspective view of the lower half block.
2 (a) and 2 (c), the lower half block 1 constituting the RLG block 1_LAnd upper half block 1_UThe requirements for the raw materials of
(1) A material having a low coefficient of thermal expansion that suppresses fluctuations in the annular optical path length 11 to be small.
(2) Easy to process,
It is. Specifically, a moldable ceramic is selectively used. In particular, a ceramic obtained by press-molding powder by a mold and firing is a suitable raw material because of its ease of processing and good mass productivity. Glass that is easily melt-molded can also be suitably used as a raw material constituting the RLG block 1.
[0019]
In FIG. 2 (b), the backing glass tube 1 for lining the annular optical path 11, the spot facing hole 13, the first cathode opening 240, the second cathode opening 250, and the anode opening 300._TConsists of an annular optical path corresponding cavity 111, a second counterbore hole corresponding cavity 130, a counterbore hole corresponding cavity 131, a first cathode opening corresponding cavity 241, a second cathode opening corresponding cavity 251, and an anode opening corresponding cavity 301. The second counterbore hole corresponding cavity 130 has a longer overall length than the counterbore hole corresponding cavity 131. And backed glass tube 1_TIs entirely hollow, and only the outer tip of the second counterbore hole-compatible cavity 130 is open. Lined glass tube 1_TCompared with the previous insulating material constituting the RLG block 1, glass having a lower softening temperature and excellent gas retention characteristics is appropriately selected and manufactured as a raw material. Lined glass tube 1_TAs a glass material, basically, helium impermeability is selected as a requirement. Specifically, lead glass having a dense glass structure is selected, and lead glass having a softening temperature of about 700 ° C. or lower is selected. By the way, when glass is selected as the raw material of the RLG block 1, the backing glass tube 1_TIt is a further requirement that the softening temperature of the glass raw material is lower than that of the glass of the RLG block. When the raw material of the RLG block 1 is ceramic, the material can be selected only for the impermeability of helium. When placing the highest priority on this, a backing glass tube 1 suitable as a raw material is lead borate glass, which is excellent in helium impermeability._TCan be configured. Lined glass tube 1_TThe glass itself is designed to have a thickness of 100 μm to several 100 μm.
[0020]
The manufacturing process of the RLG block will be described with reference to FIG.
FIG. 3A shows the lower half block 1 of FIG._L, Lined glass tube 1_TUpper half block 1_UAre stacked in this order, lower block 1_LAnd upper half block 1_ULined glass tube 1_TIt is a figure which shows the place which pinched | interposed. Lower half block 1_L, Lined glass tube 1_TUpper half block 1_UAre joined and integrated in this stacked state. For this joint integration, a low softening temperature glass paste or powder frit is applied as an adhesive, and the temperature is raised and the adhesive is heated and melted for bonding. When ceramic is selected as the raw material of the RLG block 1, a ceramic adhesive can also be used. This stacked lower half block 1_L, Lined glass tube 1_TUpper half block 1_UThe whole is housed in a heating furnace, heated to about 700 ° C. and heated. Lined glass tube 1_TWhen a glass having a particularly high softening temperature is selected as the raw material, the temperature is further increased correspondingly. This heating is done with the backed glass tube 1_TThe inner glass tube 1 is formed by applying no pressure to the inside through the opening at the outer tip of the second counterbore hole corresponding cavity 130._TIs softened, lower half block 1_L, Lined glass tube 1_TUpper half block 1_UThe three are integrated. In this state, the backing glass tube 1_TIs the lower half block 1_LAnd upper half block 1_UIt is closely heat-sealed.
[0021]
Referring to FIG. 3 (b), the integrated lower half block 1_L, Lined glass tube 1_TAnd upper half block 1_UAfter cooling, the outer front end portion of the second counterbore hole corresponding cavity 130 is cut and removed according to the RLG block 1 to be opened. Further, the sealing portions at the exposed tips of the counterbore corresponding cavity 131, the first cathode opening corresponding cavity 241, the second cathode opening 251 and the anode opening corresponding cavity 301 are also removed and opened.
In the above embodiment, as a preferred embodiment, an electrode is constituted by two cathodes, ie, a first cathode and a second cathode, and one anode. However, the first anode is reversed in polarity. And it can be constituted by two anodes of the second anode and one cathode.
[0022]
The above RLG block is an RLG block suitable for constituting a small, medium precision, low cost ring laser gyro having an annular optical path length of 10 cm or less.
Here, the second embodiment will be described with reference to FIGS. In the second embodiment, members corresponding to those in the previous embodiment are given the same reference numerals.
FIG. 5 is an exploded perspective view of the RLG block, FIG. 5 (a) is a perspective view of the upper half block, FIG. 5 (b) is a perspective view of the backing glass tube, and FIG. 5 (c) is a perspective view of the lower half block. It is. FIG. 6 is a diagram for explaining the assembly order of the RLG blocks. FIG. 6A is a diagram in which the lower half block, the backing glass tube, and the upper half block in FIG. FIG. 6 (b) is a diagram showing a place where the backing glass tube is sandwiched and joined, FIG. 6 (b) is a diagram showing a place where an unnecessary part of the backing glass tube is cut and removed, and FIG. 6 (c) is a diagram showing a horizontal cross section at the joined portion. is there.
[0023]
The hatched portion indicates the glass portion of the lower half block of the rectangular plate-shaped RLG block. The annular optical path 11 formed of a thin tube formed inside the glass block 1 and the annular optical path from the top for ensuring the gas capacity as a laser resonator. 11 is shown separately from the counterbore hole 13 formed in communication with the gas reservoir 4 and other portions that provide room for accommodating a larger amount of internal filling gas. The two adjacent vertices of the rectangular plate-shaped RLG block and the opening of the counterbore hole 13 formed on one side facing this are located at the vertices of an equilateral triangle, and the annular optical path 11 constitutes an equilateral triangle. are doing. The mirrors 30, 31, and 32 are attached to the openings of the spot facing holes 13, and are input to the entrances of the first cathode opening 240, the second cathode opening 250, and the anode opening 300 formed on the side surface of the block. Are attached with a first cathode, a second cathode, and an anode for laser oscillation. The dotted line connecting the vertices constituting the equilateral triangle indicates the oscillating laser beam. The center hole is for adhering the dither and penetrates the block up and down.
[0024]
In the second embodiment, the lower half block 1 is formed by horizontally dividing the RLG block into two vertically._LAnd upper half block 1_UIs manufactured by cutting using glass ceramic such as Zerodure (registered trademark, Carl Zeiss Stiffing), which is impermeable to helium gas. The ease of processing to cut these blocks using glass ceramic as a raw material is slightly inferior to the ease of processing by molding and firing with a mold, but the ease is far higher than that of the prior art. Lined glass tube 1_TManufactures quartz glass as a raw material. Lower half block 1_LAnd upper half block 1_UThe two-part annular optical path 11 constituting the annular optical path on both abutting surfaces_L,_U, Half counterbore hole 13 constituting counterbore hole_L,_U, A gas reservoir cavity 40 that constitutes the gas reservoir 4_L,_UIs formed. Upper half block 1_U Are further formed with a first cathode opening 240, a second cathode opening 250, and an anode opening 300. The counterbore corresponding cavity comprises a counterbore hole corresponding cavity 131 and a second counterbore hole corresponding cavity 130, The second counterbore hole-corresponding cavity 130 is configured to have a longer overall length than the counterbore hole-corresponding cavity 131, and the outer end thereof is opened.
[0025]
Here, lower half block 1_LAnd upper half block 1_ULined glass tube 1_TIs inserted. This lined glass tube 1_TConsists of a counterbore hole corresponding cavity 131 and a second counterbore hole corresponding cavity 130, and an annular optical path corresponding cavity 111 which is connected to these in a triangular shape to form the annular optical path 11, and the annular optical path corresponding cavity 111 includes a first A cathode opening corresponding cavity 241, a second cathode opening corresponding cavity 251, and an anode opening corresponding cavity 301 are erected vertically. The counterbore hole-corresponding cavity 131 and the second counterbore hole-corresponding cavity 130 are finally mounted with mirrors, and correspond to the first cathode opening corresponding cavity 241, the second cathode opening corresponding cavity 251, and the anode opening corresponding. The electrode is finally attached to the cavity 301. The first cathode opening corresponding cavity 241, the second cathode opening corresponding cavity 251, and the anode opening corresponding cavity 301 are erected vertically, and the lower half block 1 is where the electrodes are attached._LAnd upper half block 1_UAvoid being located on the joint surface. Next, a backing glass tube 1 made of quartz glass_TLower block 1 consisting of zero dewar_LAnd upper half block 1_UAnd the three members are fusion-bonded with low-melting glass. Thereby, the space between these three members is filled with the low melting point glass. Next, the part where the mirror and the electrode are attached is opened, and the mirror attachment surface of the glass block is polished.
[0026]
The above-described second embodiment of the RLG block is also an RLG block suitable for constituting a small, medium precision, low cost ring laser gyro having an annular optical path length of 10 cm or less.
[0027]
【The invention's effect】
As described above, according to the invention described in claims 1 to 6, the cavity containing the mixed gas composed of helium and neon is lined with glass having sufficient gas retention characteristics, and the cavity is machined. RLG blocks with excellent gas retention characteristics can be efficiently manufactured by using ceramics with excellent processability, ceramics that can be molded, or glass, and manufacturing costs for small and medium-precision ring laser gyros Can be lowered.
[0028]
That is, it is possible to provide a simple RLG block manufacturing method that eliminates a drilling process that requires a large number of processing steps. Since the annular optical path is formed by stacking the lower half block, the backing glass tube, and the upper half block in this order and joining them together, it is not necessary to form a hole to form the annular optical path.
And since the structure which consists of a lower half block and an upper half block ensures the precision of a cyclic | annular optical path, the precision precision of a backing glass tube is eased.
Moreover, the tolerance of the temperature fluctuation of a finished RLG block can be improved by semi-melting the backing glass tube and bringing it into close contact with the lower half block and the upper half block.
[0029]
Furthermore, the RLG block material can be selected regardless of the gas retention characteristics by using a glass material having excellent gas retention characteristics in the portion filled with gas.
The RLG block made of zero dewar has excellent helium retention characteristics as the outer shell, and the back glass tube 1 made of quartz glass_TCan fully compensate for the disadvantages.
In order to extend the life of the RLG, the sealed gas necessary for laser oscillation must be confined inside the block. In addition to the counterbore hole, the gas reservoir 4 is further formed to form the RLG. The lifespan of the product has been significantly extended.
[0030]
Further, in the previous embodiment, an RLG block that pursues low thermal expansion and processability for the upper half block and the lower half block and has a helium gas impermeability function for the backing glass tube has been pursued. In the second embodiment, the upper half block and the lower half block have a function of impervious to helium gas, thereby expanding the degree of freedom of the material of the backing glass tube and facilitating selection. As a result, the backing glass tube may be composed of ordinary quartz glass as a raw material.
Further, by making the shape of the RLG block a rectangular plate, there is room for forming the gas reservoir 4 in addition to the counterbore hole, thereby reducing both the absolute amount of helium gas to be accommodated and the lifetime of the laser. Can be enlarged.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an embodiment.
FIG. 2 is an exploded perspective view of an RLG block and a backing glass tube.
FIG. 3 is a diagram illustrating a manufacturing process of an RLG block.
FIG. 4 is a diagram illustrating RLG.
FIG. 5 is an exploded perspective view illustrating a second embodiment.
FIG. 6 is a view for explaining the assembly order of the second embodiment.
[Explanation of symbols]
1 Glass block 1_L Lower half block
1_U  Upper half block 1_T Lined glass tube
10 Resonator 11 Annular optical path
11_L,_U  Two-minute annular optical path 111 Cavity for annular optical path
13 counterbore hole 13_L,_U  2 countersunk holes
130 Second counterbore hole cavity 131 Counterbore hole cavity
24 1st cathode 25 2nd cathode
240 First cathode opening 240_L,_U  2 minutes first cathode opening
241 Cavity corresponding to first cathode opening 250 Second cathode opening
250_L,_U  2 minutes 2nd cathode opening 251 2nd cathode opening
3 Anode 30 Transflective concave mirror
300 Anode opening 300_L,_U  2 minutes anode opening
301 Cavity corresponding to anode opening 31 First plane mirror
32 Second plane mirror 34 Corner cube
35 External transflective mirror 36 Photodetector
4 Gas reservoir 4_L,_U  2-minute gas reservoir
40 Cavity for gas reservoir

Claims (10)

A lower half block and an upper half block which are formed symmetrically with respect to each other's butt surface and are butt-joined;
A hollow glass tube comprising a cavity corresponding to an annular optical path, a cavity corresponding to a counterbore hole communicating with the cavity corresponding to the annular optical path, a cavity corresponding to a cathode opening, and a cavity corresponding to an anode opening;
A ring laser gyro block characterized in that a backing glass tube is sandwiched between a lower half block and an upper half block, and the three members are joined and fixed together. The ring laser gyro block according to claim 1,
The lower half block and the upper half block have a bisected annular optical path constituting an annular optical path, a bisected countersunk hole constituting a counterbore hole, and a halved first cathode constituting a first cathode opening on both abutting surfaces. An opening, a two-minute anode opening that forms a second cathode opening, a two-minute anode opening that forms an anode opening,
The counterbore hole-corresponding cavity consists of a counterbore hole-corresponding cavity and a second counterbore hole-corresponding cavity, and the second counterbore hole-corresponding cavity has a longer overall length than the counterbore hole-corresponding cavity, and its outer end is opened. A ring laser gyro block characterized by that. In the ring laser gyro block according to claim 2,
A ring laser gyro block that is opened by removing the exposed portion of the backing glass tube. In the ring laser gyro block according to any one of claims 1 to 3,
A ring laser gyro block characterized in that the lower half block and the upper half block are molded products of ceramic or glass. In the ring laser gyro block according to any one of claims 1 to 4,
A ring laser gyro block characterized in that the raw material constituting the backing glass tube is lead glass. On both abutting surfaces, a bisecting annular optical path constituting an annular optical path, a bisecting countersunk hole constituting a counterbored hole, a bisecting first cathode opening constituting a first cathode opening, and a second cathode opening are provided. The lower half block and the upper half block in which the two-part second cathode opening and the two-part anode opening constituting the anode opening are formed are manufactured separately (step 1).
A cavity corresponding to an annular optical path, a cavity corresponding to a spot facing hole, a cavity corresponding to a second spot facing hole, a cavity corresponding to a first cathode opening, a cavity corresponding to a second cathode opening, a cavity corresponding to an anode opening, and a cavity corresponding to a second spot facing hole Is configured to have a longer overall length than the counterbore hole-corresponding cavity, and manufactures a backing glass tube that opens only the outer tip of the second counterbore hole-corresponding cavity (step 2).
A lower half block, a backing glass tube, and an upper half block are stacked in this order and joined together to produce a block half product (step 3).
Place the block semi-finished product in a heating furnace, raise the temperature while pressing air into the backing glass tube through the opening for the second counterbore hole, and place the backing glass tube on the inner surface of the lower and upper half blocks. Fixing by heat sealing (step 4),
A method of manufacturing a ring laser gyro block, comprising: a step of removing an exposed portion of the backing glass tube after the block semi-finished product is cooled and opening the block (step 5). An annular optical path-corresponding cavity and a counterbore cavity-corresponding cavity, a cathode-opening-corresponding cavity, and an anode, each having a lower half block and an upper half block that are formed symmetrically with respect to each abutment surface and are butt-joined In a ring laser gyro block comprising a backing glass tube composed of an opening-corresponding cavity, and sandwiching the backing glass tube between the lower half block and the upper half block, and joining and fixing the three members together,
A ring laser gyro block characterized in that the lower half block and the upper half block are made of a low thermal expansion and helium gas impermeable material, and the backing glass tube is made of quartz glass. The ring laser gyro block according to claim 7,
The lower half block and the upper half block are formed with a bisection annular optical path constituting an annular optical path and a half counterbore hole constituting a counterbore hole on both abutting surfaces, and the first cathode is further opened in the upper half block. A hole, a second cathode opening, and an anode opening are formed, and the counterbore corresponding cavity is composed of a counterbore corresponding cavity and a second counterbore corresponding cavity, and the second counterbore corresponding cavity is a counterbore corresponding cavity. A ring laser gyro block having a longer overall length than that of the outer ring and having an outer end opened. In the ring laser gyro block according to claim 8,
A ring laser gyro block that is opened by removing the exposed portion of the backing glass tube. In the ring laser gyro block according to any one of claims 7 to 9,
In the lower half block and the upper half block, a halved gas reservoir cavity constituting a gas reservoir is further formed on both abutting surfaces, and the backing glass tube communicates with the annular optical path corresponding cavity and the annular optical path corresponding cavity. A ring laser gyro block further having a reservoir-compatible cavity.

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