CN115061240A

CN115061240A - Elastic beam structure, optical fiber filter and assembling method thereof

Info

Publication number: CN115061240A
Application number: CN202210423473.7A
Authority: CN
Inventors: 钟少龙; 刘昌霞; 李健; 张鑫鑫; 凌晶芳
Original assignee: Shanghai B&a Sensor Co ltd
Current assignee: Shanghai B&a Sensor Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-09-16

Abstract

A spring beam structure, an optical fiber filter and an assembling method thereof, the spring beam structure comprising: a frame; a plurality of elastic connection members symmetrically connected to both inner sides of the frame; a structural block suspended from the frame by the resilient connecting member, the frame semi-surrounding the structural block. The invention can provide better resilience force, thereby improving the moving frequency and increasing the moving displacement.

Description

Elastic beam structure, optical fiber filter and assembling method thereof

Technical Field

The invention relates to the technical field of photoelectricity, in particular to an elastic beam structure, an optical fiber filter and an assembling method of the optical fiber filter.

Background

Optical couplers or multiplexers may be used to multiplex light of different wavelengths into one optical fiber, with different wavelengths carrying different information. At the receiving end, a fiber filter may be used to separate the desired wavelength from the fiber, and light other than this wavelength will be rejected.

Taking a fabry-perot (F-P) fiber filter as an example, the incident light wave propagates through the filter, and is reflected back and forth between the end faces of two fibers with the end faces coated with a reflective film for many times, so as to form resonance and obtain band-pass filtering characteristics. Specifically, the tuning process of the F-P cavity is based on the interference effect of multiple beams, when at least one of the two end face structures can be adjusted, the selection of light waves with different wavelengths can be performed and the F-P resonant cavity is formed, and when the cavity length of the cavity changes, the wavelength of the corresponding transmitted light wave also changes.

In the prior art, when cavity length changes (such as cavity length changes of an F-P resonant cavity) are involved, an elastic beam structure is usually adopted to provide resilience force after being pressed so as to change the cavity length. However, the elasticity of the existing elastic beam structure is often small, and the elastic beam structure is not easy to rebound after deformation, so that the cavity length change frequency is low, the filtering rate of the optical fiber filter is low, and the requirement is difficult to meet.

There is a need for a flexible beam structure that provides greater flexibility and better resiliency to increase the frequency of movement and increase the amount of movement displacement.

Disclosure of Invention

The invention provides an elastic beam structure, an optical fiber filter and an assembling method thereof, which can provide better resilience force, further improve the moving frequency and increase the moving displacement.

To solve the above technical problem, an embodiment of the present invention provides an elastic beam structure, including: a frame; a plurality of elastic connection members symmetrically connected to both inner sides of the frame; a structural block suspended from the frame by the resilient connecting member, the frame semi-surrounding the structural block.

Optionally, at least a portion of the at least two symmetrical elastic connecting members is straight rod-shaped.

Optionally, the frame comprises: the through holes correspond to at least one part of the elastic connecting parts one by one; a distance exists between each through hole and the corresponding elastic connecting part, and the distance is smaller than a preset distance; the through direction of the through hole is perpendicular to the surface of the frame.

Optionally, the shape of the through hole is selected from: rounded polygons, ovals, circles, and irregularities.

Optionally, the frame portion between the straight-bar-shaped elastic connecting component and the corresponding through hole is connected with the straight-bar-shaped elastic connecting component in a T shape.

Optionally, the through hole includes a straight line edge and an arc line edge; wherein the straight edge is closer to the corresponding flexible connecting member than the curved edge.

Optionally, the frame, the plurality of elastic connecting members and the structural block are integrally formed.

Optionally, the frame, the plurality of elastic connecting members and the structural block have the same thickness; wherein the thickness is in a direction perpendicular to a surface of the frame.

Optionally, the frame is U-shaped, and the plurality of elastic connection members are symmetrically connected to symmetrical portions of the frame: the interior of the structural block having a first axial passage therethrough, the asymmetric portion of the frame having a second axial passage therethrough; wherein the extension axes of the first axial channel and the second axial channel are identical.

Optionally, the first axial channel and the second axial channel are parallel to a surface of the frame.

Optionally, the material of the elastic connecting part satisfies one or more of the following conditions: the elastic connecting part is made of kovar alloy; the material of the elastic connecting part has a Brinell hardness greater than a preset threshold.

Optionally, the material of the elastic connection member has a brinell hardness selected from: 160 to 500.

To solve the above technical problem, an embodiment of the present invention provides an optical fiber filter, including: the above-described elastic beam structure; and the piezoelectric sensor is coupled with the structural block in the elastic beam structure and generates thrust to the structural block when receiving power.

Optionally, the piezoelectric sensor is piezoelectric ceramic; wherein, the piezoelectric ceramic contains at least one through hole, or contains at least one through hole and one or more blind holes.

Optionally, the frame is U-shaped, the plurality of elastic connecting members are symmetrically connected to a symmetrical portion of the frame, the structural block has a first axial passage therethrough inside, the asymmetrical portion of the frame has a second axial passage therethrough, and extension axes of the first axial passage and the second axial passage are coincident; the optical fiber filter further includes: a first ferrule removably positioned within the first axial passage and movable with the structural block; a second ferrule removably positioned within the second axial passage; wherein one end of the first ferrule is opposite to one end of the second ferrule.

Optionally, a plurality of screws are used to press the side surface of the first ferrule to stabilize the first ferrule within the first axial passage; and/or, pressing a side of the second ferrule with a plurality of screws to stabilize the second ferrule within the second axial passage.

Optionally, the optical fiber filter further includes: the first optical fiber is positioned in the first inserting core and is fixedly connected with the first inserting core; the second optical fiber is positioned in the second inserting core and is fixedly connected with the second inserting core; when one end of the first inserting core is opposite to one end of the second inserting core, the end face of the first inserting core and the end face of the second inserting core form an F-P resonant cavity of the optical fiber filter.

Optionally, the first optical fiber is a gold-plated optical fiber; and/or the second optical fiber is a gold-plated optical fiber.

Optionally, the optical fiber filter further includes: a tail end frame having a tail end channel adapted to the first axial channel, and both ends of the tail end frame are coupled to both ends of the frame, respectively; the tail end frame presses one end of the piezoelectric sensor, so that the piezoelectric sensor presses the structural block and generates initial pretightening force.

Optionally, the tail end frame is in a straight shape.

Optionally, the temperature coefficient of the frame is positive, the temperature coefficient of the tail end frame is negative, and a difference between an absolute value of the temperature coefficient of the frame and an absolute value of the temperature coefficient of the tail end frame is smaller than a preset threshold; and/or the hardness of the tail end frame is greater than the preset hardness.

Optionally, two ends of the tail end frame are respectively connected with two ends of the frame by adopting threaded connection; wherein, the connecting position of the tail end frame is positioned on the same side surface of the tail end frame.

Optionally, the thread density of the threaded hole of the threaded connection is greater than the preset density.

Optionally, the frame is U-shaped, and the piezoelectric sensor is half-surrounded by a symmetrical portion of the frame; the inner side surface of the symmetrical part of the frame comprises one or more pairs of limit structures matched with the piezoelectric sensor; the limiting structure symmetrically limits the position of the piezoelectric sensor.

Optionally, the number of the elastic connecting parts is greater than or equal to 4; at least two symmetrical elastic connecting parts adjacent to the piezoelectric sensor are straight rod-shaped; at least two symmetrical elastic connecting parts far away from the piezoelectric sensor are in a bent shape or a broken line shape.

In order to solve the above technical problem, an embodiment of the present invention provides an assembling method of an optical fiber filter, where a first axial channel is formed through an inside of the structural block, and the frame has a second axial channel formed therethrough, where extension axes of the first axial channel and the second axial channel are the same, and the optical fiber filter further includes a tail end frame; the assembling method comprises the following steps: inserting a first ferrule into the first axial passage and a second ferrule into the second axial passage; placing the piezoelectric sensor within the frame; coupling two ends of the tail end frame with two ends of the frame respectively so that the tail end frame presses one end of the piezoelectric sensor and the piezoelectric sensor presses the structural block and generates initial pretightening force; adjusting a height of the first ferrule within the first axial channel and/or adjusting a height of the second ferrule within the second axial channel such that an end of the first ferrule is opposite an end of the second ferrule.

Optionally, coupling the two ends of the tail end frame with the two ends of the frame respectively comprises: connecting two ends of the tail end frame with two ends of the frame respectively by adopting threaded connection; and adjusting the tightness of the threaded connection to obtain the initial pretightening force.

Optionally, the optical fiber filter further includes: the first optical fiber is positioned in the first inserting core and fixedly connected with the first inserting core, and the second optical fiber is positioned in the second inserting core and fixedly connected with the second inserting core; adjusting the height of the first ferrule within the first axial passage, and/or adjusting the height of the second ferrule within the second axial passage comprises: pressing a side of the first ferrule with a plurality of screws to stabilize the first ferrule within the first axial passage; and/or, pressing a side of the second ferrule with a plurality of screws to stabilize the second ferrule within the second axial channel; when one end of the first inserting core is opposite to one end of the second inserting core, the end face of the first inserting core and the end face of the second inserting core form an F-P resonant cavity of the optical fiber filter.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, the elastic connecting part is adopted to support the structure block, compared with the mode that the narrow groove is formed in the whole structural member, the narrow groove is used for being squeezed and deformed to generate the resilience force.

Furthermore, the straight-rod-shaped elastic connecting part is adopted, compared with the fully-bent elastic connecting part, the first-order natural frequency of the straight-rod-shaped elastic connecting part is higher, the elasticity is better, the deformation is easier to rebound, and the requirement can be better met.

Further, the through hole which is relatively close to the elastic connecting part is arranged, so that stress can be conducted in a larger range and a larger deformation margin can be provided when the elastic connecting part moves, and the mobility and the resilience of the elastic connecting part are further increased.

Further, the frame part between the straight-bar-shaped elastic connecting part and the corresponding through hole is a T-shaped transverse part, the straight-bar-shaped elastic connecting part is used as a T-shaped vertical part, the T-shaped connection can better conduct stress, the T-shaped connection is not easy to break, and better elasticity and resilience can be provided.

Further, for part of graphs, the straight line edge is closer to the corresponding elastic connecting part than the arc line edge, so that the frame part between the elastic connecting part and the corresponding through hole is straighter and thinner, and the resilience force is further improved.

Further, frame, a plurality of elastic connection spare and the structure piece is integrated into one piece, compares in the splice, and the atress is more even, and elasticity and resilience performance are better.

Further, the elastic connecting part is made of a material with Brinell hardness greater than a preset threshold value, and can better conduct stress and provide better resilience force due to high hardness. .

Furthermore, the temperature coefficient of the tail end frame is negative, the absolute value of the temperature coefficient is larger than or equal to the preset temperature coefficient, the temperature coefficient of the tail end frame is set to be an extremely low negative temperature coefficient, the temperature coefficient can be partially or completely offset with the temperature coefficient of the frame, and then the overall temperature coefficient of the optical fiber filter is smaller.

Drawings

FIG. 1 is a schematic top view of a spring beam construction according to an embodiment of the invention;

FIG. 2 is a schematic top view of another spring beam configuration in accordance with an embodiment of the present invention;

FIG. 3 is a schematic top view of yet another spring beam construction in accordance with an embodiment of the present invention;

FIG. 4 is a schematic top view of an optical fiber filter according to an embodiment of the present invention;

FIG. 5 is a schematic sectional view taken along the line A1-A2 in FIG. 4;

FIG. 6 is a schematic top view of a rear frame of an optical fiber filter according to an embodiment of the present invention;

fig. 7 is a flow chart of a method for assembling an optical fiber filter according to an embodiment of the present invention.

Fig. 8 is a flow chart of a method for assembling an optical fiber filter according to an embodiment of the present invention.

Detailed Description

The inventor of the present invention has found that in the prior art, a narrow groove penetrating through a structural member is generally formed in a monolithic structural member, and then the narrow groove is compressed and deformed to generate a resilient force. Because the structural member has certain hardness, the space in the narrow groove is smaller, the deformation degree of the structural member is smaller, the provided resilience force is smaller, and the cavity length change frequency is lower.

In the embodiment of the invention, the elastic connecting parts are adopted to support the structure blocks, compared with the mode that the narrow grooves are formed in the whole structural member, the narrow grooves are used for being squeezed and deformed to generate the resilience force.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 1, fig. 1 is a schematic top view of a flexible beam structure according to an embodiment of the present invention. The elastic beam structure may include a frame 11, a plurality of elastic connection members 12, and a structural block 13.

Wherein a plurality of elastic connection members 12 may be symmetrically connected to both inner sides of the frame 11; the structural block 13 is suspended from the frame 11 by the elastic connecting member 12, and the frame 11 semi-surrounds the structural block 13.

It should be noted that the frame 11 may have a certain thickness and surround the structural block 13 in a semi-surrounding manner, and the structural block 13 is suspended in the middle of the frame 11, so that the adjacent elastic connecting members 12 are empty and have a large space for elastic movement after being stressed.

In the embodiment of the present invention, the elastic connection members 12 are used to suspend the structural block 13, and compared with the case where the narrow grooves are formed in the entire structural member 13 and the elastic connection members 12 are used to generate the elastic resilience by the compression deformation of the narrow grooves, the elastic connection members 12 are used to generate the elastic resilience by the movement deformation of the elastic connection members 12, and the elastic connection members 12 have a wider movable range due to the empty space between the adjacent elastic connection members 12, thereby providing a better elastic resilience.

Further, at least a portion of the at least two symmetrical elastic connection members 12 may be straight rod-shaped.

Specifically, a part of the two symmetrical elastic connection members 12 may be straight rod-shaped, a part of the two or more symmetrical elastic connection members 12 may be straight rod-shaped, the entire two or more symmetrical elastic connection members 12 may be straight rod-shaped, or the entire two or more symmetrical elastic connection members 12 may be straight rod-shaped. As shown in the figure, 4 elastic connection members 12 are taken as an example, two of the elastic connection members 12 are arranged symmetrically, and all of the 4 elastic connection members 12 are straight rod-shaped.

In the embodiment of the present invention, at least two symmetrical elastic connection components 12 are in the shape of a full or partial straight rod, and compared with a fully bent elastic connection component, the first-order natural frequency of the straight-rod elastic connection component 12 is higher, the elasticity is better, and the elastic connection component is more resilient after being deformed, so that the requirement can be better satisfied.

Further, the frame 11 may include: through holes 14 corresponding one-to-one to at least a part of the elastic connection members 12; a distance exists between each through hole 14 and the corresponding elastic connecting part 12, and the distance is smaller than a preset distance; the through hole 14 has a through direction perpendicular to the surface of the frame 11.

In particular, the frame 11 may have a thickness, and the through hole 14 as shown may pass through the frame 11. Some or all of the elastic connection parts 12 have through holes 14, and the distance between each through hole 14 and the corresponding elastic connection part 12 is smaller than a preset distance, so that a smaller distance is obtained, and the elastic connection parts 12 can transmit the received force to the through holes 14.

In the embodiment of the present invention, the through hole 14 is disposed at a short distance from the elastic connection part 12, so that when the elastic connection part 12 moves, the force can be transmitted in a wider range and a larger deformation margin is provided, and the mobility and the resilience of the elastic connection part 12 can be further increased.

Still further, the shape of the through hole 14 is selected from: rounded polygons, ovals, circles, and irregularities.

For example, the through-holes shown in fig. 1 are rounded rectangles and have a large aspect ratio, so that the force can be transmitted to a greater extent when the elastic connection member 12 moves.

Further, the through hole 14 may include a straight edge and an arc edge; wherein the straight sides are closer to the corresponding flexible connecting member 12 than the curved sides.

Taking the round rectangle as an example, the through hole 14 at the upper left corner in the figure may include a curved side (e.g., a round corner) and a straight side (e.g., a rectangular side), and one of the straight sides may be below and opposite to the elastic connection component 12, and the curved sides may be above left, below left, above right, below right and opposite to and away from the elastic connection component 12.

Similarly, it can be obtained that the through hole 14 at the upper left corner is irregular, such as semi-elliptical or semi-circular, with the straight side below and opposite adjacent to the flexible connecting part 12, and the elliptical or circular arc side above and opposite away from the flexible connecting part 12.

In the embodiment of the present invention, for a part of the figure, the straight side is closer to the corresponding elastic connection member 12 than the arc side, so that the frame part between the elastic connection member 12 and the corresponding through hole 13 is straighter and thinner, and the resilience is further improved.

Further, the frame portion between the straight-bar-shaped elastic connecting member 12 and the corresponding through hole 14 is connected to the straight-bar-shaped elastic connecting member 12 in a T shape.

In the embodiment of the present invention, the frame portion between the straight-bar-shaped elastic connecting component 12 and the corresponding through hole 14 is a T-shaped horizontal portion, and the straight-bar-shaped elastic connecting component is a T-shaped vertical portion, and the T-shaped connection can better transmit force, is not easy to break, and can provide better elasticity and resilience.

In the embodiment of the present invention, in the case of the T-shaped connection, the straight edge is closer to the corresponding elastic connection member 12 than the arc edge, so that the frame portion (e.g., the cross of the T-shaped) between the elastic connection member 12 and the corresponding through hole 13 is straighter and thinner, and the resilience is further improved.

Further, the frame 11, the plurality of elastic connection members 12, and the structural block 13 may be integrally formed.

In the embodiment of the present invention, the frame 11, the plurality of elastic connection members 12, and the structural block 13 are integrally formed, so that the elastic beam structure is more uniformly stressed and has better elasticity and resilience compared with a spliced structure.

Further, the materials of the frame 11, the plurality of elastic connection members 12, and the structural block 13 may be uniform.

It can be understood that the frame 11, the plurality of elastic connecting components 12 and the structural blocks 13 are made of the same material, so that an integrally formed elastic beam structure is easier to form, and the material parameters of all parts are consistent, and the stress is more uniform.

Further, the frame 11, the plurality of elastic connection members 12, and the structure block 13 are uniform in thickness; wherein the thickness direction is perpendicular to the surface of the frame 11.

In the embodiment of the invention, the uniform thickness is adopted, so that the stress between the symmetrical elastic connecting parts 12 is more uniform, the force transmitted to the frame 11 is more uniform, and the elasticity and resilience performance are further improved.

Further, the frame 11 may be U-shaped, and the plurality of elastic connection members 12 may be symmetrically connected to symmetrical portions of the frame 11: the interior of the structural block 13 may have a first axial passage 151 therethrough, and the asymmetric portion of the frame 11 may have a second axial passage 152 therethrough; wherein the extension axes of the first axial channel 151 and the second axial channel 152 may be identical.

Specifically, the U-shaped frame 11 may provide a symmetrical inner side to a greater extent to meet the requirement that the plurality of elastic connection members 12 are symmetrically connected.

In particular, the asymmetric portion of the frame 11 may be a middle area connecting the symmetric portions, so that the case where the extension axes of the first axial passage 151 and the second axial passage 152 are coincident as illustrated may be achieved.

More specifically, the case where the extension axes are consistent may be used to indicate that the first axial channel 151 and the second axial channel 152 can be opposite (may have an alignment deviation within a preset error range), and may also indicate that the difference between the radii of the first axial channel 151 and the second axial channel 152 is smaller than a preset difference, in other words, the sizes of the first axial channel 151 and the second axial channel 152 are relatively consistent.

In the embodiment of the present invention, by providing the first axial passage 151 and the second axial passage 152 extending in the same axis, it is possible to make the components placed in the first axial passage 151 and the second axial passage 152 have a relative positional relationship.

Further, the first axial channel 151 and the second axial channel 152 may be parallel to the surface of the frame 11.

In the embodiment of the present invention, by arranging the first axial passage 151 and the second axial passage 152 extending in the same axis to be parallel to the surface of the frame 11, the components placed in the first axial passage 151 and the second axial passage 152 can be also parallel to the surface of the frame 11, and have a better relative position relationship.

Further, the material of the elastic connection part 12 may satisfy one or more of the following: the material of the elastic connecting part 12 is kovar alloy (also called sealing alloy or constant expansion alloy); the material of the elastic connection member 12 has a brinell hardness greater than a preset threshold.

In the embodiment of the invention, the elastic connecting part 12 is formed by adopting the kovar alloy, so that the hardness and the elasticity can be better considered, the elastic beam structure is not easy to break, and better resilience can be provided.

It is noted that other suitable materials may be used, such as stainless steel materials, other metallic materials, etc.

In the embodiment of the present invention, the elastic connection member 12 is made of a material having a brinell hardness greater than a predetermined threshold, and thus has a high hardness, so that it can better transmit a force and can provide a better resilience.

It can be understood that the brinell hardness of the material of the elastic connecting component 12 cannot be too low, otherwise the elastic beam structure is easily deformed, the force transmission is insufficient, and the resilience force is small; the brinell hardness of the material of the elastic connecting part 12 cannot be too high, otherwise the elastic beam structure is easily broken, and the stress is insufficient.

As a non-limiting example, the Brinell hardness of the material of the elastomeric connecting member 12 may be selected from the group consisting of: 160 to 500, i.e. may be selected from HB160 to HB500, e.g. may be selected from HB340 to HB400, e.g. is HB 363.

Referring to fig. 2, fig. 2 is a schematic top view of another spring beam structure according to an embodiment of the present invention. The following description is made of a point different from the structure of the elastic beam in fig. 1.

Specifically, a part of the symmetrical elastic connecting parts 21 of the other elastic beam structure is connected with the frame in a T shape, and the other part of the symmetrical elastic connecting parts 22 is in a bent shape or a broken line shape.

More specifically, the elastic connection member 22 has a curved or broken line shape, and may be, for example, an S-shaped or S-like broken line as shown in the figure.

In the embodiment of the present invention, the elastic connection member 22 is disposed in a curved or folded shape, so as to provide elasticity and resilience, thereby meeting the use requirement of the elastic beam structure.

Further, the elastic connection member 22 may be of a uniform thickness or a non-uniform thickness.

In the embodiment of the present invention, the elastic connection member 22 has a uniform thickness to better transmit the force, and the elastic connection member 22 has a non-uniform thickness to help reduce the manufacturing complexity and the production cost.

Further, the sum of the number of the elastic connecting parts 21 and the number of the elastic connecting parts 22 is greater than or equal to 4; at least two symmetrical elastic connecting parts 21 adjacent to the stress end of the elastic beam structure are straight rod-shaped; at least two symmetrical elastic connecting parts 22 far away from the stress end of the elastic beam structure are in a bent shape or a broken line shape.

Specifically, the straight-bar-shaped elastic connection member 21 can provide a larger resilient force and can better guide the force received into the frame 11 than the curved or broken-line-shaped elastic connection member 22, and therefore, providing the straight-bar-shaped elastic connection member 21 adjacent to the force receiving end of the elastic beam structure can more effectively avoid breakage and provide a higher operating frequency.

For more details on the flexible connecting member 22, reference is made to the description in fig. 1, and further description is omitted here.

Referring to fig. 3, fig. 3 is a schematic top view of another elastic beam structure according to an embodiment of the present invention. The following description is made of a point different from the structure of the elastic beam in fig. 1.

Specifically, a portion of the symmetrical elastic connecting part 31 of the still another elastic beam structure is connected with the frame in a T shape, and the other portion of the symmetrical elastic connecting part 32 is in a curved shape or a broken line shape.

More specifically, the elastic connection member 32 has a curved or folded line shape, and may be, for example, an E-shaped or E-like folded line as shown in the figure.

It should be noted that the elastic connection component 32 may also be a W-shaped or W-like folding line, an M-shaped or M-like folding line, or other suitable shapes.

It should be noted that, in the embodiment of the present invention, the specific shape of the structural block may not be limited, and for example, the structural block may be a rectangle, may also be a pattern shown in fig. 3, and may also be an irregular pattern.

For more details on the flexible connecting member 32, reference is made to the description of fig. 1 and the flexible connecting member 22, which are not described herein again.

Referring to fig. 1, 4 and 5 in combination, fig. 4 is a schematic top view of an optical fiber filter according to an embodiment of the present invention, and fig. 5 is a schematic cross-sectional view taken along a direction a1-a2 in fig. 4.

As shown, the optical fiber filter may include: a spring beam structure 41 and a piezoelectric sensor 42.

Specifically, the elastic beam structure 41 may include the frame 11 (refer to fig. 1), the elastic connection member 12 (refer to fig. 1), and the structure block 13 (refer to fig. 1) as previously described and illustrated in fig. 1 to 3.

The piezoelectric transducer 42 may be coupled to the structural mass 13 in the elastic beam structure 41, and generate a pushing force on the structural mass 13 when receiving power.

Wherein the thrust direction is a left-to-right thrust, as shown in the figure.

Further, the piezoelectric sensor 42 may be a piezoelectric ceramic; wherein the piezoelectric ceramic may contain at least one through hole (not shown), or at least one through hole and one or more blind holes (not shown).

In particular, the at least one through hole and the one or more blind holes may be used for heat dissipation to improve the performance of the piezoelectric ceramic, and in particular, in view of the periodic thrust generated by the piezoelectric sensor 41 on the structural block 13 through high frequency movement, timely heat dissipation may reduce the temperature within the piezoelectric ceramic.

Further, some or all of the through holes have an extension axis coinciding with the first axial passage 431.

In particular, a through hole having an axis of extension coinciding with the first axial passage 431 may be used for passing the optical fiber 481 in the fiber filter.

More specifically, the case of a uniform extension axis may be used to indicate that some or all of the through holes are able to oppose the first axial channel 151 (which may have alignment deviations within a preset tolerance), it being noted that, since the through holes are used to pass through the optical fiber 481 and the first axial channel 151 is used to pass through the first ferrule 441, the cross-sectional size of the through holes may be smaller than the cross-sectional size of the first axial channel 151.

It should be noted that the piezoelectric sensor 42 may also have other dimensions, such as the thickness of the piezoelectric sensor 42 being less than the thickness of the frame 11, so that the optical fiber may pass under the piezoelectric sensor 42.

Further, the frame 11 may be U-shaped, the plurality of elastic connection members 12 are symmetrically connected to a symmetrical portion of the frame 11, the structural block 13 has a first axial passage 431 therethrough inside, and an asymmetrical portion of the frame 11 has a second axial passage 432 therethrough, wherein the first axial passage 431 and the second axial passage 432 have the same extension axis; the optical fiber filter may further include: a first ferrule 441 and a second ferrule 442.

Wherein a first ferrule 441 is removably positioned within the first axial channel 431 and moves with the structural block 13; a second ferrule 442 removably positioned within the second axial passage 432; wherein one end of the first ferrule 441 is opposite to one end of the second ferrule 442.

Furthermore, the friction force between the first ferrule 441 and the structure block 13 may be greater than a preset friction force threshold, that is, the first ferrule 441 and the structure block 13 may have a larger friction force, so as to move synchronously with the structure block 13, and increase the operation speed in the optical fiber filter as much as possible, so that the elastic beam structure 12 drives the first ferrule 441 in the structure block 13 to move at a high speed, so as to provide a high-speed filtering function.

In one non-limiting embodiment, one or more screws (not shown) may be used to press against the side of the first ferrule 441 to stabilize the first ferrule 441 within the first axial passage 431; and/or, one or more screws (not shown) may be used to compress the sides of the second ferrule 442 to stabilize the second ferrule 442 within the second axial passage 432.

It should be noted that other suitable manners may also be adopted to increase the friction between the first ferrule 441 and the structural block 13, and other suitable manners may also be adopted to increase the friction between the second ferrule 442 and the frame 11, for example, screws, bolts, etc., and the method of stabilizing the first ferrule 441 in the first axial passage 431 and stabilizing the second ferrule 442 in the second axial passage 432 is not limited in the embodiment of the present invention.

Further, the optical fiber filter may further include: a first optical fiber 481 positioned inside the first ferrule 441 and fixedly connected with the first ferrule 441; a second optical fiber 482 positioned within the second ferrule 442 and fixedly coupled to the second ferrule 442; wherein the end surface of the first ferrule 441 and the end surface of the second ferrule 442 form an F-P resonator of the fiber optic filter when one end of the first ferrule 441 is opposite to one end of the second ferrule 442.

Still further, the first and/or

second ferrules

441 and 442 may be ferrules, and the endfaces of the first and

second ferrules

441 and 442 may form an F-P cavity of the fiber optic filter.

It can be understood that the tuning process of the F-P cavity is based on the interference effect of multiple light beams, and when at least one of the relative structures of the F-P cavity can be adjusted, the selection of light waves with different wavelengths can be performed, that is, when the cavity length of the cavity changes, the wavelength of the corresponding transmitted light wave also changes.

The first and

second ferrules

441 and 442, which are disposed in parallel and opposite to each other, may form an F-P resonant cavity, and reflective films may be coated on inner surfaces of the first and

second ferrules

441 and 442, so that when a beam of light is incident through the ferrules, the refracted light may be reflected back and forth between inner reflective surfaces of the first ferrule 441, and may also be reflected back and forth between inner reflective surfaces of the second ferrule 442, thereby forming a multi-beam interference effect. Only when the wavelength of the light wave meets a certain condition, the light wave can be transmitted out of the cavity.

It should be noted that, in order to increase the transmission of the light wave, on one hand, a coating material with a reflectivity higher than a preset reflectivity threshold may be coated to increase the intensity of the light beam interference effect, so as to improve the optical performance of the F-P cavity, and on the other hand, the operation speed in the optical fiber filter may also be increased, that is, the elastic beam structure 12 may drive the first ferrule 441 in the structure block 13 to move at a high speed, so as to provide a high-speed filtering function.

In the embodiment of the invention, the optical fiber filter adopts the elastic connecting part 12 to support the structure block 13, the elastic connecting part 12 generates resilience force by utilizing the moving deformation of the elastic connecting part 12, and the adjacent elastic connecting parts 12 are empty, so that the movable range of the elastic connecting part 12 is larger, and better resilience force can be provided, and the first inserting core 441 in the structure block 13 can be driven to move at a high speed, so that a more effective high-speed filtering function is brought for the optical fiber filter, and the tunable wavelength range is improved.

Still further, the first optical fiber 481 may be a gold-plated optical fiber; and/or, the second optical fiber 482 may be a gold-plated optical fiber.

In the embodiment of the present invention, by using the gold-plated optical fiber, external light interference can be reduced, and the fiber lifetime of the first optical fiber 481 and the second optical fiber 482 can be improved.

Referring to fig. 1, 4, 5 and 6 in combination, fig. 6 is a schematic top view of a tail end frame of an optical fiber filter according to an embodiment of the present invention.

Specifically, the optical fiber filter may further include a tail frame 45, the tail frame 45 may have a tail channel 451 adapted to the first axial channel 431, and both ends of the tail frame 45 are respectively coupled to both ends of the frame 11; wherein the tail end frame 45 presses one end of the piezoelectric sensor 42, so that the piezoelectric sensor 42 presses the structural block 13 and generates an initial pre-tightening force.

Specifically, the piezoelectric sensor 42 may be placed in the frame 11, and then both ends of the tail frame 45 are coupled to both ends of the frame 11, respectively, so that the tail frame 45 presses one end of the piezoelectric sensor 42, and the piezoelectric sensor 42 presses the structural block 13 and generates an initial pre-tightening force.

In other words, the piezoelectric sensor 42 may be used to compress the structural mass 13 and generate a periodic thrust with a pulsed current when receiving the pulsed current.

Further, the tail end frame 45 is in a straight shape.

In the embodiment of the invention, by adopting the straight-line-shaped tail end frame 45, compared with the U-shaped tail end frame 45, the connection complexity can be reduced, and the stress uniformity of each connection point can be improved, so that uniform pre-tightening force is provided on the section.

Further, two ends of the tail end frame 45 may be respectively connected with two ends of the frame 11 by using a threaded connection; wherein, the connection position of the tail end frame 45 can be located at the same side of the tail end frame 45.

Specifically, the two ends of the tail end frame 45 may be provided with a threaded connection through hole 461 and a threaded connection through hole 462 in advance, and blind holes may be provided at corresponding positions of the two ends of the frame 11, and threads may be provided in the blind holes, and then the two ends of the tail end frame 45 are connected to the two ends of the frame 11 by using threaded connection.

The attachment locations of the aft frame 45 as shown in fig. 6 may all be located on the right side of the aft frame 45, further improving the capacity of the assembled assembly.

Specifically, the threaded coupling may include, and is not limited to: threaded column connection, threaded nail connection, threaded bolt connection and the like.

In the embodiment of the present invention, by using the screw coupling, the tightness between the rear end frame 45 and the frame 11 can be uniformly adjusted, that is, the pressure between the rear end frame 45 and the frame 11 can be uniformly increased or decreased.

Further, the thread density of the threaded hole of the threaded connection is greater than the preset density.

In the embodiment of the present invention, the thread density of the threaded hole of the threaded connection is greater than the preset density, and the tightness between the tail end frame 45 and the frame 11 can be more finely and more uniformly adjusted by adopting the denser threaded connection, which is helpful for improving the setting accuracy of the pre-tightening force.

Further, the temperature coefficient of the frame 11 may be positive, the temperature coefficient of the tail end frame 45 may be negative, and a difference between an absolute value of the temperature coefficient of the frame 11 and an absolute value of the temperature coefficient of the tail end frame 45 is smaller than a preset threshold; and/or the hardness of the tail end frame 45 is greater than the preset hardness.

In the embodiment of the present invention, the temperature coefficient of the tail end frame 45 is negative, and the absolute value of the temperature coefficient is greater than or equal to the preset temperature coefficient, and the temperature coefficient of the tail end frame 45 can be set to be an extremely low negative temperature coefficient, so that the temperature coefficient can be offset with a part or all of the temperature coefficient of the frame 11, and the temperature coefficient of the whole optical fiber filter is smaller, thereby improving the device performance of the optical fiber filter. In addition, in the embodiment of the present invention, the stiffness of the tail end frame 45 is greater than the predetermined stiffness, that is, the tail end frame 45 with a greater stiffness is adopted, so that the stress deformation can be reduced, and the support can be better provided when the elastic beam structure rebounds.

Further, the frame 11 may be U-shaped, the piezoelectric sensor 42 being half-surrounded by a symmetrical portion of the frame 11; the inner side of the symmetrical part of the frame 11 comprises one or more pairs of limit structures 47 which are matched with the piezoelectric sensors 42; the position limiting structure 47 symmetrically limits the position of the piezoelectric sensor 42.

It should be noted that, in the drawings, 4 limiting structures are taken as an example for illustration, but the number of the specific limiting structures is not limited in the embodiment of the present invention.

In the embodiment of the present invention, by providing the limiting structure 47, the position of the piezoelectric sensor 42 can be limited, and the stability of the piezoelectric sensor 42 and the accuracy of the movement direction can be improved.

Further, in the optical fiber sensor according to the embodiment of the present invention, the number of the elastic connection members 12 is 4 or more; at least two symmetrical elastic connecting members 12 adjacent to said piezoelectric transducer 42 are of a straight rod shape; at least two symmetrical elastic connecting parts 12 far away from the piezoelectric sensor 42 are in a bent shape or a broken line shape.

Specifically, the elastic connection member 12 is a straight rod shape, which provides a larger resilient force than a curved shape or a broken line shape, and is capable of better guiding the force into the frame 11, so that the elastic connection member 12 having a straight rod shape is provided adjacent to the piezoelectric sensor 42 (i.e., the force receiving end of the elastic beam structure), which can more effectively avoid breaking and provide a higher operating frequency.

Referring to table 1, table 1 is a first 10 order natural frequency diagram of an E-shaped flexible beam structure and a T-shaped flexible beam structure.

TABLE 1

Referring to fig. 7, fig. 7 is a schematic diagram illustrating the displacement of the elastic connection component in the X direction under a 100N step load in the embodiment of the present invention.

As can be seen from table 1 and fig. 7, the first-order natural frequency of the straight-bar T-shaped elastic beam structure is higher, and for example, the yield frequency of the straight-bar T-shaped elastic beam structure is not reached when the high-frequency motion of 2kHz is realized.

In a non-limiting specific embodiment, the elastic beam structure is subjected to comparative stress analysis by respectively adopting four straight rod-shaped T-shaped elastic connecting part designs, four bent or folded-line-shaped E-shaped elastic connecting part designs and four bent or folded-line-shaped S-shaped elastic connecting part designs, and 10 times of 100N force is loaded to the two ends of the asymmetric part and the structural block in the U-shaped frame, so that the E-shaped elastic beam structure and the S-shaped elastic beam structure are subjected to plastic deformation and are seriously deformed.

Further, a force of 10 times 100N is loaded to the asymmetric portion of the U-shaped frame and the two ends of the structural block, knowing that when the T-shaped elastic beam structure is provided and is adjacent to the stressed end, both elastic beam structures can rebound.

From the above, the straight-bar-shaped T-shaped elastic connection component design can achieve a larger tuning wavelength range, and the yield strength of the elastic beam structure is less likely to be achieved.

Referring to fig. 8, fig. 8 is a flowchart of an assembling method of an optical fiber filter according to an embodiment of the present invention.

Specifically, the structure block has a first axial channel passing through the inside thereof, and the frame has a second axial channel passing through the inside thereof, wherein the first axial channel and the second axial channel have the same extension axis, and the fiber filter further comprises a tail end frame; the method of assembling the optical fiber filter may include steps S81 to S84:

step S81: inserting a first ferrule into the first axial passage and a second ferrule into the second axial passage;

step S82: placing the piezoelectric sensor within the frame;

step S83: coupling two ends of the tail end frame with two ends of the frame respectively so that the tail end frame presses one end of the piezoelectric sensor and the piezoelectric sensor presses the structural block and generates initial pretightening force;

step S84: adjusting a height of the first ferrule within the first axial channel and/or adjusting a height of the second ferrule within the second axial channel such that an end of the first ferrule is opposite an end of the second ferrule.

Specifically, the ferrule is inserted first, then the piezoelectric sensor is placed, the tail end frame is made to extrude one end of the piezoelectric sensor, the piezoelectric sensor is made to extrude the structural block and generate initial pretightening force, assembly of the optical fiber filter can be achieved, and formation of an F-P resonant cavity of the optical fiber filter is facilitated.

In the embodiment of the invention, the piezoelectric sensor is placed between the insertion of the ferrule and the height adjustment of the ferrule, so that after one end of the first ferrule is opposite to one end of the second ferrule, the interference of the steps related to the piezoelectric sensor can be avoided, and the relative accuracy of the adjustment of the ferrules is improved.

Further, the step of coupling both ends of the tail end frame with both ends of the frame, respectively, may include: connecting two ends of the tail end frame with two ends of the frame respectively by adopting threaded connection; and adjusting the tightness of the threaded connection to obtain the initial pretightening force.

In the embodiment of the invention, the initial pretightening force can be more finely adjusted through threaded connection, and the adjustment accuracy and precision are improved.

Further, the optical fiber filter further includes: the first optical fiber is positioned in the first inserting core and fixedly connected with the first inserting core, and the second optical fiber is positioned in the second inserting core and fixedly connected with the second inserting core; adjusting the height of the first ferrule within the first axial passage, and/or adjusting the height of the second ferrule within the second axial passage comprises: pressing a side of the first ferrule with a plurality of screws to stabilize the first ferrule within the first axial passage; and/or, pressing a side of the second ferrule with a plurality of screws to stabilize the second ferrule within the second axial channel; when one end of the first ferrule is opposite to one end of the second ferrule, the end face of the first ferrule and the end face of the second ferrule form an F-P resonant cavity of the optical fiber filter.

In the embodiment of the invention, the height of the insert core in the corresponding axial channel can be more finely adjusted by screw extrusion, and the adjustment accuracy and precision are improved, so that the F-P resonant cavity of the high-quality optical fiber filter is formed.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this document indicates that the former and latter related objects are in an "or" relationship.

The "plurality" appearing in the embodiments of the present application means two or more.

The descriptions of the first, second, etc. appearing in the embodiments of the present application are only for illustrating and differentiating the objects, and do not represent the order or the particular limitation of the number of the devices in the embodiments of the present application, and do not constitute any limitation to the embodiments of the present application.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A spring beam structure, comprising:

a frame;

a plurality of elastic connection members symmetrically connected to both inner sides of the frame;

a structural mass suspended from the frame by the resilient connecting member, the frame semi-surrounding the structural mass.

2. The flexible beam structure of claim 1 wherein at least a portion of at least two symmetrical flexible connecting members are straight rod-shaped.

3. The spring beam structure of claim 2 wherein the frame comprises:

the through holes correspond to at least one part of the elastic connecting parts one by one;

a distance exists between each through hole and the corresponding elastic connecting part, and the distance is smaller than a preset distance;

the through direction of the through hole is perpendicular to the surface of the frame.

4. The spring beam structure of claim 3 wherein the shape of the through-hole is selected from the group consisting of: rounded polygons, ovals, circles, and irregularities.

5. The spring beam structure of claim 3,

the frame part between the straight-bar-shaped elastic connecting part and the corresponding through hole is connected with the straight-bar-shaped elastic connecting part in a T shape.

6. The spring beam structure of claim 3 or 5 wherein the through-holes comprise straight and curved edges;

wherein the straight edge is closer to the corresponding flexible connecting member than the curved edge.

7. The spring beam structure of claim 1,

the frame, the plurality of elastic connecting members and the structural block are integrally formed.

8. The spring beam structure of claim 1,

the frame, the plurality of elastic connecting parts and the structural block are consistent in thickness;

wherein the thickness is in a direction perpendicular to a surface of the frame.

9. The spring beam structure of claim 1 wherein the frame is U-shaped, the plurality of spring connecting members being symmetrically connected to symmetrical portions of the frame:

the interior of the structural block having a first axial passage therethrough, the asymmetric portion of the frame having a second axial passage therethrough;

wherein the extension axes of the first axial channel and the second axial channel are identical.

10. The spring beam structure of claim 9 wherein the first axial channel and the second axial channel are parallel to a surface of the frame.

11. The spring beam structure of claim 1, wherein the material of the spring connecting member satisfies one or more of:

the elastic connecting part is made of kovar alloy;

the material of the elastic connecting part has a Brinell hardness greater than a preset threshold.

12. The spring beam structure of claim 11,

the material of the elastic connection member has a brinell hardness selected from the group consisting of: 160 to 500.

13. An optical fiber filter, comprising:

a spring beam structure according to any one of claims 1 to 12;

and the piezoelectric sensor is coupled with the structural block in the elastic beam structure and generates thrust to the structural block when receiving power.

14. The fiber optic filter of claim 13, wherein the piezoelectric sensor is a piezoelectric ceramic;

wherein the piezoelectric ceramic comprises at least one through hole, or comprises at least one through hole and one or more blind holes.

15. The fiber filter according to claim 13, wherein the frame is U-shaped, the plurality of resilient connecting members are symmetrically connected to symmetrical portions of the frame, the structural block has a first axial passage therethrough in its interior, and the asymmetrical portion of the frame has a second axial passage therethrough, wherein the first and second axial passages have an axis of extension coincident;

the optical fiber filter further includes:

a first ferrule removably positioned within the first axial passage and movable with the structural block;

a second ferrule removably positioned within the second axial passage;

wherein one end of the first ferrule is opposite to one end of the second ferrule.

16. The optical fiber filter according to claim 15,

pressing a side of the first ferrule with a plurality of screws to stabilize the first ferrule within the first axial passage;

and/or the presence of a gas in the gas,

pressing a side of the second ferrule with a plurality of screws to stabilize the second ferrule within the second axial passage.

17. The fiber optic filter of claim 15, further comprising:

the first optical fiber is positioned in the first inserting core and is fixedly connected with the first inserting core;

the second optical fiber is positioned in the second inserting core and is fixedly connected with the second inserting core;

when one end of the first inserting core is opposite to one end of the second inserting core, the end face of the first inserting core and the end face of the second inserting core form an F-P resonant cavity of the optical fiber filter.

18. The optical fiber filter of claim 17,

the first optical fiber is a gold-plated optical fiber;

and/or the presence of a gas in the gas,

the second optical fiber is a gold-plated optical fiber.

19. The fiber optic filter of claim 15, further comprising:

a tail end frame having a tail end channel adapted to the first axial channel, and both ends of the tail end frame are coupled to both ends of the frame, respectively;

the tail end frame presses one end of the piezoelectric sensor, so that the piezoelectric sensor presses the structural block and generates initial pretightening force.

20. The optical fiber filter according to claim 19,

the tail end frame is in a straight line shape.

21. The optical fiber filter of claim 19,

the temperature coefficient of the frame is positive, the temperature coefficient of the tail end frame is negative, and the difference value between the absolute value of the temperature coefficient of the frame and the absolute value of the temperature coefficient of the tail end frame is smaller than a preset threshold value;

and/or the presence of a gas in the gas,

the rigidity of the tail end frame is greater than the preset rigidity.

22. The optical fiber filter according to claim 19,

two ends of the tail end frame are respectively connected with two ends of the frame by adopting threaded connection;

wherein, the connecting position of the tail end frame is positioned on the same side surface of the tail end frame.

23. The optical fiber filter according to claim 22,

the thread density of the threaded holes in threaded connection is greater than the preset density.

24. The fiber optic filter of claim 13, wherein the frame is U-shaped, the piezoelectric transducer being semi-surrounded by a symmetrical portion of the frame;

the inner side surface of the symmetrical part of the frame comprises one or more pairs of limit structures matched with the piezoelectric sensor;

the limiting structure symmetrically limits the position of the piezoelectric sensor.

25. The optical fiber filter according to claim 13, wherein the number of the elastic connection members is 4 or more;

at least two symmetrical elastic connecting parts adjacent to the piezoelectric sensor are in a straight rod shape;

at least two symmetrical elastic connecting parts far away from the piezoelectric sensor are in a bent shape or a broken line shape.

26. A method of assembling an optical fiber filter according to any one of claims 13 to 25, wherein the structure block has a first axial passage therethrough in the interior thereof, and the frame has a second axial passage therethrough, wherein the first axial passage and the second axial passage have the same extension axis, the optical fiber filter further comprising a rear end frame;

the assembling method comprises the following steps:

inserting a first ferrule into the first axial passage and a second ferrule into the second axial passage;

placing the piezoelectric sensor within the frame;

coupling two ends of the tail end frame with two ends of the frame respectively so that the tail end frame presses one end of the piezoelectric sensor and the piezoelectric sensor presses the structural block and generates initial pretightening force;

adjusting a height of the first ferrule within the first axial channel and/or adjusting a height of the second ferrule within the second axial channel such that an end of the first ferrule opposes an end of the second ferrule.

27. The method of assembling an optical fiber filter according to claim 26, wherein coupling both ends of the tail end frame with both ends of the frame, respectively, comprises:

connecting two ends of the tail end frame with two ends of the frame respectively by adopting threaded connection;

and adjusting the tightness of the threaded connection to obtain the initial pretightening force.

28. The method of assembling an optical fiber filter according to claim 26, wherein the optical fiber filter further comprises: the first optical fiber is positioned in the first inserting core and fixedly connected with the first inserting core, and the second optical fiber is positioned in the second inserting core and fixedly connected with the second inserting core;

adjusting the height of the first ferrule within the first axial passage, and/or adjusting the height of the second ferrule within the second axial passage comprises:

and/or the presence of a gas in the gas,

pressing a side of the second ferrule with a plurality of screws to stabilize the second ferrule within the second axial channel;