CN111175950A - Bilateral telecentric lens - Google Patents

Abstract

The invention relates to the technical field of lenses, in particular to a bilateral telecentric lens, which comprises a front end lens barrel, a first optical lens, a second optical lens, a first adapter, a connecting lens barrel and a second adapter, wherein the first adapter is arranged between the front end lens barrel and the first optical lens, the connecting lens barrel is used for connecting the first adapter and the second adapter, the second adapter is arranged between the connecting lens barrel and the second optical lens, and the directions of the first optical lens and the second optical lens are the same; the built-in first angle adjusting part that is equipped with beam splitting prism and is used for adjusting beam splitting prism's angle of first adapter, the built-in second angle adjusting part that is equipped with the speculum and is used for adjusting the angle of speculum of second adapter. The bilateral telecentric lens provided by the invention has small occupied space; the path of the light path is adjusted through the fine adjustment effect of the first angle adjusting component and the second angle adjusting component, and the path deviation of the light path is reduced.

Description

Bilateral telecentric lens

Technical Field

The invention relates to the technical field of lenses, in particular to a bilateral telecentric lens.

Background

The telecentric lens is a high-end machine vision lens, and is characterized by that it can eliminate the problem of different magnification due to the inconsistent distance between the tested object (or CCD chip) and lens, and because the telecentric lens has unique technical advantages, at present, it is specially applicable to the field of precision measurement for the requirements of high-precision detection of mechanical component measurement, plastic component measurement, glass product and medicine component measurement and electronic component measurement.

At present, the structure of the lens adopting double-side observation is also available on the market, different multiplying powers can be set, and therefore the detection efficiency is improved. And because the double-side lens divides an original light path into two beams, the path of the light path is generally changed by the beam splitter prism or the reflecting mirror, so the position angle of the beam splitter prism, the reflecting mirror and other parts for changing the path of the light path determines the accuracy of the path of the light path.

Disclosure of Invention

The invention provides a double-side telecentric lens aiming at the problems in the prior art, wherein a first optical lens and a second optical lens are positioned at the same side, so that the volume of the telecentric lens can be reduced; the position of the beam splitting prism is finely adjusted through the first angle adjusting component, and the position of the reflector is finely adjusted through the second angle adjusting component, so that the path of the light path can be adjusted, and the path deviation of the light path is reduced.

In order to solve the technical problems, the invention adopts the following technical scheme: a bilateral telecentric lens comprises a front end lens barrel, a first optical lens, a second optical lens, a first adapter, a connecting lens barrel and a second adapter, wherein the first adapter is arranged between the front end lens barrel and the first optical lens; the built-in first angle adjusting part that is equipped with beam splitter prism and is used for adjusting beam splitter prism's angle of first adapter, the built-in second angle adjusting part that is equipped with the speculum and is used for adjusting the angle of speculum of second adapter.

Preferably, the first angle adjusting assembly comprises at least two splitting prism mounting seats, angle adjusting pieces and first tightening pieces, connecting pieces are arranged between the splitting prism mounting seats and the angle adjusting pieces, two ends of each connecting piece are respectively arranged in the middle of the splitting prism mounting seats and the middle of the angle adjusting pieces, two ends of each connecting piece are respectively connected with the splitting prism mounting seats and the angle adjusting pieces, and the first tightening pieces are movably arranged on the angle adjusting pieces and used for abutting against the splitting prism mounting seats; the first adapter is provided with a mounting hole and three transfer holes, the mounting hole is used for fixing the angle adjusting assembly, and the three transfer holes are respectively used for assembling the lens cone, the first optical lens and connecting the lens cone; the angle adjusting piece is assembled in the mounting hole and is rotatably connected with the hole wall of the mounting hole.

Preferably, three screw holes are opened to the angle adjustment piece, and the interval sets up between the adjacent screw hole, first elasticity piece is equipped with threely, and is three first elasticity piece is installed respectively in three threaded hole, the pore wall spiro union of first elasticity piece and screw hole, and three first elasticity piece sets up around the connecting piece, and the connecting wire of three first elasticity piece constitutes triangle-shaped.

Preferably, four threaded holes are formed in the angle adjusting piece, the adjacent threaded holes are arranged at intervals, the first tightening pieces are four in number and are respectively arranged in the four threaded holes, the first tightening pieces are in threaded connection with the hole walls of the threaded holes, and the four first tightening pieces are arranged around the connecting piece.

Preferably, a protective cover is detachably connected to one side, far away from the beam splitter prism mounting seat, of the angle adjusting piece; the mounting hole is provided with a locking plate, the locking plate is provided with a rotating hole, the rotating hole is used for assembling a protective cover, and the protective cover is in threaded connection with the inner wall of the rotating hole.

Preferably, the second angle adjusting assembly comprises a reflector mounting seat, an adjusting seat and a tightness adjusting assembly, the adjusting seat is used for assembling the reflector mounting seat, the tightness adjusting assembly comprises at least two second tightening pieces, one end of each second tightening piece penetrates through the adjusting seat and then is in threaded connection with the reflector mounting seat, the other end of each second tightening piece is arranged on the adjusting seat, a circular ring is sleeved on each second tightening piece, and the circular ring is located between the adjusting seat and the reflector mounting seat; the fixed plate has been installed to the second adapter can be dismantled, adjust the seat and install on the fixed plate.

Preferably, the quantity of second elasticity piece is three, and the interval sets up between two adjacent second elasticity pieces, and is three the line of second elasticity piece constitutes triangle-shaped, all overlaps on the three second elasticity piece to be equipped with the ring and overlaps and be equipped with the spacer ring, the spacer ring is located between ring and the regulation seat, and the both sides of spacer ring contradict with the ring and regulation seat respectively.

Preferably, adjust the seat facial make-up and be equipped with two at least first retaining members, adjacent two the interval sets up between the first retaining member, the one end and the regulation seat spiro union of first retaining member, the other end and the speculum mount pad of first retaining member are contradicted.

Preferably, the number of the first locking members is three, the three first locking members are respectively arranged at intervals, and connecting lines of the three first locking members form a triangle.

The invention has the beneficial effects that:

1. a second adapter is added, a reflector is arranged in the second adapter, two light paths are parallel after the light splitting of the light splitting prism through the reflection of the reflector, the length of a light path at one side of the light beam reflected by the light splitting prism is shortened, and therefore the length of the connecting lens barrel is shortened;

2. the position angle of the beam splitting prism is adjusted through the first angle adjusting assembly, and the position angle of the reflecting mirror is adjusted through the second angle adjusting assembly, so that the path of the finally formed two light paths is attached to an ideal path to the maximum degree, the angle deviation of the light paths can be reduced, and the measurement precision of the telecentric lens is higher.

Drawings

Fig. 1 is a schematic structural diagram of a double-sided telecentric lens in the prior art.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic view of a connection structure of the first rotating joint and the first angle adjusting assembly according to the present invention.

Fig. 4 is a schematic structural diagram of a first adapter of the present invention.

Fig. 5 is a schematic structural view of the first adapter of the present invention with a locking plate installed.

Fig. 6 is a schematic view of a connection structure between the first angle adjusting assembly and the beam splitter prism according to the present invention.

Fig. 7 is a schematic structural diagram of a first angle adjustment assembly of the present invention.

Fig. 8 is a front view of the first angle adjustment assembly of fig. 7.

Fig. 9 is a top view of the first angle adjustment assembly of fig. 7.

Fig. 10 is a schematic view showing the structure of an angle adjusting member with two threaded holes according to the present invention.

Fig. 11 is a schematic structural view of an angle adjusting member with three threaded holes according to the present invention.

Fig. 12 is a schematic view of an angle adjusting member with four threaded holes according to the present invention.

Fig. 13 is an exploded view of the second adapter and the second angle adjustment assembly of the present invention.

Fig. 14 is a schematic structural view of a second angle adjustment assembly of the present invention.

FIG. 15 is a schematic view of a second angle adjustment assembly of the present invention with two second fastening members.

FIG. 16 is a side view of a second angle adjustment assembly of the present invention.

FIG. 17 is a schematic view of a second angle adjustment assembly of the present invention with three second fastening members.

Fig. 18 is a cross-sectional view at AA in fig. 17.

Fig. 19 is a schematic structural view of the second angle adjustment assembly of the present invention after hiding the mirror mount.

The reference numerals in fig. 1 to 19 include:

1-front lens barrel, 2-first optical lens, 3-second optical lens, 4-first adapter, 41-beam splitter prism, 42-first angle adjustment component, 421-beam splitter prism mount, 422-angle adjustment component, 423-first loose piece, 424-connecting piece, 425-threaded hole, 426-protective cover, 428-mounting groove, 429-seal, 430-second loose piece, 43-mounting hole, 44-switching hole, 45-locking plate, 46-rotating hole, 5-connecting lens barrel, 6-second adapter, 61-reflector, 62-second angle adjustment component, 621-reflector mount, 622-adjustment seat, 623-second loose piece, 624-circular ring, 625-spacer ring, 626-first locking member, 627-groove, 628-opening, 63-fixing plate.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.

A double-sided telecentric lens provided in this embodiment, as shown in fig. 2, fig. 3, fig. 6 and fig. 13, includes a front end lens barrel 1, a first optical lens 2, a second optical lens 3, a first adapter 4, a connection lens barrel 5 and a second adapter 6, where the first adapter 4 is installed between the front end lens barrel 1 and the first optical lens 2, the connection lens barrel 5 is used to connect the first adapter 4 and the second adapter 6, and the second adapter 6 is installed between the connection lens barrel 5 and the second optical lens 3; the built-in first angle adjusting part 42 that is equipped with beam splitting prism 41 and is used for adjusting the angle of beam splitting prism 41 of first adapter 4, the built-in second angle adjusting part 62 that is equipped with speculum 61 and is used for adjusting the angle of speculum 61 that is equipped with of second adapter 6.

Specifically, the present embodiment has two light path paths, the beam splitter prism 41 in the first adapter 4 splits the light path formed by the front lens barrel 1 into two light paths, the first light path passes through the first optical lens 2, the second light path passes through the connecting lens barrel 5, is reflected by the reflector 61, and finally reaches the second optical lens 3, the second adapter 6 and the reflector 61 are added, so that the second light path is reflected again to change the path, preferably, the angle of the reflector 61 is adjusted to make the second light path parallel to the first light path, therefore, compared with the linear length of the second light path which is not reflected again, the path length of the second light path which is reflected again in the connecting lens barrel 5 is shortened, the length of the connecting lens barrel 5 is shortened, so that the occupied space of the side surface of the telecentric lens at both sides is reduced, and the whole occupied space of the telecentric lens is reduced, the position installation when being favorable to the actual production to use, and when assembling structures such as CCD camera, because the camera lens all is in same side, so make the assembly structure more simple and convenient. In fact, the angle of the reflecting mirror 61 can be set according to actual requirements, a second light path with different angles is obtained, and the angle range between the two light paths which are vertically adjusted to be parallel can be set. In addition, after the lens module of the double-sided telecentric lens is installed, if the angle deviation of the second beam of light path occurs and the deviation value exceeds the specified range, the position of the beam splitter prism 41 is properly adjusted through the first angle adjusting assembly 42, and the beam splitting angle of the beam splitter prism 41 is matched by adjusting the position of the reflector through the second angle adjusting assembly 62, so that the second beam of light path is attached to an ideal path, the path angle deviation of the light path is reduced, and the precision of the double-sided telecentric lens is higher.

As shown in fig. 3 to 10, the first angle adjustment assembly 42 includes a light splitting prism mounting seat 421, an angle adjustment member 422, and at least two first fastening members 423, a connection member 424 is installed between the light splitting prism mounting seat 421 and the angle adjustment member 422, two ends of the connection member 424 are respectively disposed in the middle of the light splitting prism mounting seat 421 and the middle of the angle adjustment member 422, two ends of the connection member 424 are respectively connected to the light splitting prism mounting seat 421 and the angle adjustment member 422, and the first fastening members 423 is movably installed on the angle adjustment member 422 and is used for abutting against the light splitting prism mounting seat 421; the first adapter 4 is provided with a mounting hole 43 and three transfer holes 44, the mounting hole 43 is used for fixing the angle adjusting assembly 422, and the three transfer holes 44 are respectively used for assembling the lens barrel, the first optical lens 2 and the connecting lens barrel 5; the angle adjuster 422 is fitted in the mounting hole 43 and is rotatably connected to the wall of the mounting hole 43.

Specifically, firstly, the light splitting prism 41 is fixed on the light splitting prism mounting seat 421, the angle adjusting piece 422 is rotatable, firstly, the position angle of the light splitting prism 41 is roughly adjusted through the rotation angle adjusting piece 422, the first loosening piece 423 is adjusted, so that the first loosening piece 423 is abutted against the light splitting prism mounting seat 421, the angle adjusting piece 422 is assembled in the mounting hole 43 of the first adapter 4, when the light path is subjected to light splitting, if the angle is deviated, the first loosening piece 423 at the corresponding position is adjusted, the abutting force of the different first loosening pieces 423 on the light splitting prism mounting seat 421 is different, so that the angle of the light splitting prism mounting seat 421 is finely adjusted, the most accurate adjusting effect can be achieved, and the angle of a required product is finally obtained.

When the number of the first fastening members 423 is two, the angle adjusting member 422 is configured as shown in fig. 10, the two threaded holes 425 are used for assembling the first fastening members 423, when the first fastening member 423 above is fastened in a direction close to the prism mount 421, the first fastening member 423 in fig. 8 pushes the top of the prism mount 421 to tilt rightward, when the first fastening member 423 below is fastened in a direction close to the prism mount 421, the first fastening member 423 pushes the bottom of the prism mount 421 to tilt rightward, when the first fastening member 423 is fastened in an opposite direction, the prism mount 421 is gradually reset, and according to the above actions, fine adjustment of the angle of the prism mount 421, that is, fine adjustment of the angle of the prism 41 is achieved, so that the angular deviation of the lens optical path is reduced.

When first elasticity piece 423 is three, three screw hole 425 have been seted up to angle adjustment piece 422, and the interval sets up between the adjacent screw hole 425, and three first elasticity piece 423 is installed respectively in three screw hole 425, the pore wall spiro union of first elasticity piece 423 and screw hole 425, and three first elasticity piece 423 sets up around connecting piece 424, and the connecting wire of three first elasticity piece 423 constitutes triangle-shaped. Specifically, the positions of the three threaded holes 425 are as shown in fig. 11, the three first fastening members 423 are located at three positions on the edge of the splitting prism mounting seat 421, and after the first angle adjusting assembly 42 is mounted on the lens, the force with which the first fastening members 423 abut against the splitting prism mounting seat 421 can be adjusted from three angles, so as to adjust the position angle of the splitting prism mounting seat 421, so that the position angle of the splitting prism mounting seat 421 is more in line with the actual requirement, and the deviation of the splitting angle of the splitting prism 41 is reduced.

When first elasticity piece 423 is four, four screw holes 425 have been seted up to angle adjustment piece 422, and the interval sets up between the adjacent screw hole 425, and first elasticity piece 423 is equipped with four, and four first elasticity pieces 423 are installed respectively in four screw holes 425, and first elasticity piece 423 and the pore wall spiro union of screw hole 425, four first elasticity pieces 423 set up around connecting piece 424. As shown in fig. 12, the four threaded holes 425 are positioned, the first fastening members 423 are mounted in the threaded holes 425, and the four first fastening members 423 are respectively positioned at the edge of the prism holder 421, so that the angle of the prism holder 421 can be adjusted in all directions, and the precision of the splitting angle of the splitting prism 41 is finally improved.

Of course, the number of the first fastening members 423 may be set to 1, but the adjustment effect is not as good as that of the plurality of first fastening members 423; the number of the first fastening members 423 may be more than four, so that the position adjustment of the splitting prism 41 can be performed from more angles with higher precision. This first angle adjustment assembly 42's simple structure, convenient operation can carry out the fine setting of angle again after the product installation for beam splitter prism 41 can be through the angle of the light path of fine setting suitable adjustment beam splitting, and the production of less deviation, and then improve the precision of beam splitting.

The double-sided telecentric lens provided by the embodiment is as shown in fig. 6, a protective cover 426 is detachably connected to one side of the angle adjusting piece 422 away from the beam splitter prism mounting seat 421, a locking plate 45 is installed in the mounting hole 43, a rotating hole 46 is formed in the locking plate 45, the rotating hole 46 is used for assembling the protective cover 426, and the protective cover 426 is in threaded connection with the inner wall of the rotating hole 46.

Specifically, after the angle adjusting piece 422 is rotated to a proper position, the angle adjusting piece 422 is protected by installing the protective cover 426, so that the problem of mistaken rotation of the angle adjusting piece 422 due to external force is avoided.

As shown in fig. 13, 14, 15 and 16, the second angle adjustment assembly 62 includes a reflector mounting seat 621, an adjustment seat 622 and a tightness adjustment assembly, the adjustment seat 622 is used for assembling the reflector mounting seat 621, the tightness adjustment assembly includes at least two second tightness members 623, one end of each second tightness member 623 penetrates through the adjustment seat 622 and is screwed with the reflector mounting seat 621, the other end of each second tightness member 623 is installed on the adjustment seat 622, a ring 624 is sleeved on each second tightness member 623, and the ring 624 is located between the adjustment seat 622 and the reflector mounting seat 621; the second adapter 6 is detachably installed with a fixing plate 63, and the adjusting seat 622 is installed on the fixing plate 63.

Specifically, the reflector 61 can be fixed on the reflector mounting seat 621 by glue but not limited to glue, and the product is preferably fixed on the reflector mounting seat 1021 by using silica gel, because the silica gel has elasticity, when the reflector 61 is mounted, the reflector 61 can be protected from deformation, so that a path of a light path of the reflector 61 used subsequently is prevented from being affected, and the generation of a path deviation of the light path is reduced; and the mirror mount 621 and the adjustment seat 622 are connected by the second fastening member 623 so that both sides of the ring 624 abut against the mirror mount 621 and the adjustment seat 622, respectively. The adjusting base 622 is fixed on the fixing plate 63 of the second adapter 6, when the path of the light path deviates, the purpose of properly changing the angle of the product can be achieved by changing the connection tightness degree of the second fastening members 623 and the reflector mounting base 621 on the corresponding portions, as shown in fig. 15 and 16, if two second fastening members 623 are provided, the two second fastening members 623 are arranged at intervals, if the two second fastening members 623 are arranged on the upper and lower sides of the adjusting base 622, if the reflector mounting base 621 is inclined to the right, as long as the adjusting base 622 is fixed, the upper second fastening member 623 is continuously screwed, the upper ring 624 is compressed, the top of the reflector mounting base 621 can be inclined to the right by a certain angle, and if the lower second fastening member 623 is screwed, the bottom of the reflector mounting base 621 is inclined to the right.

In order to achieve more angular adjustment of the mirror mount 621, it is preferable that the number of the second fastening members 623 is three, the positions of the three second fastening members 623 are as shown in fig. 17 and 18, the top is the first second fastening member 623, the lower left is the second fastening member 623, the lower right is the third second fastening member 623, the connecting line of the three second fastening members 623 forms a triangle, when the first second fastening member 623 is tightened, the corner of the mirror mount 621 at the position of the first second fastening member 623 is inclined in the direction approaching the adjustment seat 622, when the second fastening member 623 is tightened, the corner of the mirror mount 621 at the position of the second fastening member 623 is inclined in the direction approaching the adjustment seat 622, when the third second fastening member 623 is tightened, the corner of the mirror mount 621 at the position of the third second fastening member 623 is inclined in the direction approaching the adjustment seat 622, thereby realizing that the reflector mounting seat 621 drives the reflector 61 to carry out multi-directional angle fine adjustment. Of course, the number of the second fastening members 623 may be one, but the actual adjustment effect is not good enough. Due to the adoption of the adjusting screw, the reflector 61 can be subjected to small-amplitude angle adjustment, so that after the reflection angle of the light path is basically adjusted, the reflector 61 of the reflector 61 can be subjected to multi-directional fine adjustment by adjusting the second loosening pieces 623 at different positions, the light path is adjusted, the final required emergent angle is obtained, and the deviation of the light path is reduced.

In addition, the ring 624 is arranged between the adjusting seat 622 and the reflector mounting seat 621, and the ring 624 has certain elasticity, so that when the tightness between the second loosening element 623 and the reflector mounting seat 621 can be changed, the compression degree of the ring 624 is actually changed, and two sides of the ring 624 are respectively kept to be abutted against the reflector mounting seat 621 and the adjusting seat 622, so that the angle of the reflector mounting seat 621 can be adjusted according to requirements, the fixed connection between the reflector mounting seat 621 and the adjusting seat 622 can be ensured, and looseness cannot occur; moreover, the elastic ring 624 can prevent the reflector 61 from deforming due to the influence of external forces such as extrusion in the process of adjusting the position, so that the deviation of the optical path caused by the deformation of the reflector 61 is avoided, the precision of adjusting the angle of the reflector 61 is improved, and the precision of the reflection angle of the optical path is also improved. The provision of the shim ring 625 prevents the screw head of the second fastening member 623, which uses the adjusting screw, from wearing the mirror mount 621 or the ring 624.

As shown in fig. 15, 17 and 19, in the double-sided telecentric lens provided by this embodiment, at least two first locking members 626 are installed on the adjusting seat 622, and are spaced between two adjacent first locking members 626, one end of each first locking member 626 is screwed with the adjusting seat 622, and the other end of each first locking member 626 abuts against the reflector mounting seat 621; preferably, the number of the first locking members 626 is three, the three first locking members 626 are respectively arranged at intervals, and the connecting lines of the three first locking members 626 form a triangle, as shown in fig. 17.

Specifically, after the adjustment of the plurality of second fastening members 623 is completed, the first fastening member 626 is screwed until the first fastening member 626 abuts against the reflector mounting seat 621, so that the reflector mounting seat 621 and the adjustment seat 622 are fixed, and are not adjusted at will, thereby fixing the angle of the reflector 61.

Preferably, the reflector mounting seat 621 is provided with a groove 627 for mounting the reflector 61, and the groove 627 is provided with an opening 628; be equipped with the mounting groove 428 that is used for installing beam splitting prism 41 on beam splitting prism mount pad 421, mounting groove 428 is equipped with seals 429, seal 429 can dismantle and be provided with second retaining member 430.

Specifically, the groove 627 is provided for placing a fixed product to prevent the product from being displaced, and the opening 628 is provided, the mirror 61 may be slid into the groove 627 from the opening 628, and the mirror 61 may not necessarily correspond to the size of the groove 627, thereby making the mirror mount 621 suitable for placing more mirrors 61 of different sizes. The beam splitter prism 41 can be fixed by installing the beam splitter prism 41 in the installation groove 428 and then sealing the position of the seal 429 by using the second locking member 430, and the seal 429 is arranged to facilitate the installation of the beam splitter prism 41.

Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a two side telecentric lens, includes front end lens cone, first optical lens, second optical lens and first adapter, its characterized in that: the optical lens system further comprises a connecting lens barrel and a second adapter, wherein the first adapter is arranged between the front end lens barrel and the first optical lens, the connecting lens barrel is used for connecting the first adapter and the second adapter, and the second adapter is arranged between the connecting lens barrel and the second optical lens;

the built-in first angle adjusting part that is equipped with beam splitter prism and is used for adjusting beam splitter prism's angle of first adapter, the built-in second angle adjusting part that is equipped with the speculum and is used for adjusting the angle of speculum of second adapter.

2. The double-sided telecentric lens of claim 1, wherein: the first angle adjusting assembly comprises a beam splitter prism mounting seat, an angle adjusting piece and at least two first fastening pieces, a connecting piece is arranged between the beam splitter prism mounting seat and the angle adjusting piece, two ends of the connecting piece are respectively connected with the beam splitter prism mounting seat and the angle adjusting piece, and the first fastening pieces are movably arranged on the angle adjusting piece and used for being abutted against the beam splitter prism mounting seat;

the first adapter is provided with a mounting hole and three transfer holes, the mounting hole is used for fixing the angle adjusting assembly, and the three transfer holes are respectively used for assembling the lens cone, the first optical lens and connecting the lens cone; the angle adjusting piece is assembled in the mounting hole and is rotatably connected with the hole wall of the mounting hole.

3. The double-sided telecentric lens of claim 2, wherein: three screw holes are formed in the angle adjusting piece, the adjacent screw holes are arranged at intervals, the number of the first tightening pieces is three, the first tightening pieces are respectively arranged in the three screw holes, the first tightening pieces are in threaded connection with the hole walls of the screw holes, the three first tightening pieces are arranged around the connecting piece, and connecting lines of the three first tightening pieces form a triangle.

4. The double-sided telecentric lens of claim 2, wherein: four screw holes are formed in the angle adjusting piece, the adjacent screw holes are arranged at intervals, the number of the first tightening pieces is four, the first tightening pieces are respectively arranged in the four screw holes, the first tightening pieces are in threaded connection with the hole walls of the screw holes, and the four first tightening pieces are arranged around the connecting piece.

5. An angle adjustment assembly as set forth in claim 2, wherein: one side of the angle adjusting piece, which is far away from the beam splitter prism mounting seat, is detachably connected with a protective cover;

the mounting hole is provided with a locking plate, the locking plate is provided with a rotating hole, the rotating hole is used for assembling a protective cover, and the protective cover is in threaded connection with the inner wall of the rotating hole.

6. The double-sided telecentric lens of claim 1, wherein: the second angle adjusting assembly comprises a reflector mounting seat, an adjusting seat and a tightness adjusting assembly, the adjusting seat is used for assembling the reflector mounting seat, the tightness adjusting assembly comprises at least two second tightening pieces, one end of each second tightening piece penetrates through the adjusting seat and then is in threaded connection with the reflector mounting seat, and the other end of each second tightening piece is arranged on the adjusting seat;

the fixed plate has been installed to the second adapter can be dismantled, adjust the seat and install on the fixed plate.

7. The double-sided telecentric lens of claim 6, wherein: the second loosening element is sleeved with a circular ring, and the circular ring is located between the adjusting seat and the reflector mounting seat.

8. The double-sided telecentric lens of claim 7, wherein: the quantity of second elasticity piece is three, and the interval sets up, and is three between two adjacent second elasticity pieces the line of second elasticity piece constitutes triangle-shaped, all overlaps on the three second elasticity piece to be equipped with the ring and overlaps and be equipped with the spacer ring, the spacer ring is located between ring and the regulation seat, and the both sides of spacer ring are contradicted with the ring and regulation seat respectively.

9. The double-sided telecentric lens of claim 6, wherein: adjust the seat facial make-up and be equipped with two at least first retaining members, adjacent two the interval sets up between the first retaining member, the one end and the regulation seat spiro union of first retaining member, the other end and the speculum mount pad of first retaining member are contradicted.

10. The double-sided telecentric lens of claim 9, wherein: the number of the first locking pieces is three, the three first locking pieces are arranged at intervals respectively, and connecting lines of the three first locking pieces form a triangle.

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