Large-bearing decoupling high-precision piezoelectric objective lens positioning device

Abstract

The invention relates to the field of objective lens positioning, in particular to a large-bearing decoupling high-precision piezoelectric objective lens positioning device. The invention aims to provide a large-bearing decoupling high-precision piezoelectric objective lens positioning device. The piezoelectric objective lens positioning device with large bearing and decoupling capabilities and high precision can be provided. According to the technical scheme, the large-bearing decoupling high-precision piezoelectric objective lens positioning device comprises an inner base, a table top, an upper cover and a lower cover, a plurality of convex grooves I are evenly formed in the upper side of the inner base in the circumferential direction, a flexible hinge I is fixedly connected to the interior of each convex groove I through a set of bolts I, and the flexible hinge I is connected with the table top through a set of bolts II; the other side of each flexible hinge I is provided with the other set of bolts I. The other sides of the flexible hinges I are fixedly installed in the circumferential direction of the upper side of the table top through the other set of bolts I.

Description

Technical Field

[0001] The invention relates to the field of objective lens positioning, and more specifically to a large-load decoupled high-precision piezoelectric objective lens positioning device. Background Art

[0002] A piezoelectric objective lens positioning device is a device that uses the characteristics of piezoelectric materials to achieve precise control. When a piezoelectric material is subjected to a voltage, its shape will change slightly. This characteristic is applied to the objective lens positioner so that the objective lens can be accurately moved and positioned as required. This technology is usually used in application scenarios that require high-precision positioning, such as microscopes, telescopes and other optical instruments, as well as fields that require high-precision mechanical movement. In the prior art, for example, a three-dimensional objective lens positioning device and its installation method with application number 202010922734.0 provide a device that can perform three-dimensional positioning of the objective lens, but it is not suitable for providing a piezoelectric objective lens positioning device with large load-bearing and decoupling capabilities and high precision, so this application is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a high-precision piezoelectric objective lens positioning device with large load-bearing and decoupling capabilities, which can provide a high-precision piezoelectric objective lens positioning device with large load-bearing and decoupling capabilities.

[0004] The purpose of the present invention is achieved through the following technical solutions: A large-load decoupled high-precision piezoelectric objective lens positioning device, comprising an internal seat, a table, an upper cover and a lower cover, wherein the upper side of the internal seat is evenly provided with a plurality of convex grooves I along the circumferential direction, each convex groove I is fixedly connected with a flexible hinge I by a group of bolts I, the other side of each flexible hinge I is provided with another group of bolts I, the other sides of the plurality of flexible hinges I are fixedly installed on the upper circumferential direction of the table by another group of bolts I, the front and rear sides of the bottom of the table are fixedly connected with a flexible hinge II by a group of bolts I, the front and rear sides of the bottom of the internal seat are respectively provided with a convex groove II, and the outer sides of the two flexible hinges II are respectively fixedly connected to the two convex grooves II by another group of bolts I.

[0005] A deformation seat is provided on the left and right sides of the bottom of the inner seat respectively, and a groove is provided at the bottom of each deformation seat respectively. A bolt II is provided on the left and right sides of the bottom of the table top respectively, and the left and right sides of the bottom of the table top are respectively installed in the two grooves through two bolts II.

[0006] A piezoelectric ceramic is respectively provided at the four corners of the middle part of the inner seat, and the bottoms of the two piezoelectric ceramics on the left side are respectively in contact with the front and rear upper surfaces of the deformation seat on the left side, and the bottoms of the two piezoelectric ceramics on the right side are respectively in contact with the front and rear upper surfaces of the deformation seat on the right side.

[0007] An upper cover is arranged on the upper side of the inner seat, and a plurality of bolts IV are evenly arranged on the outer side of the upper cover along the circumferential direction. The upper cover is fixedly mounted on the upper side of the inner seat by the plurality of bolts IV, and a raised ring is arranged in the middle of the upper cover.

[0008] A lower cover is provided at the bottom of the inner seat, and two bolts V are respectively provided at the front and rear sides of the bottom of the lower cover. The lower cover is fixedly installed on the bottom of the inner seat by four bolts V.

[0009] Preferably, the outer surface of the inner seat is wrapped with a soft circuit board.

[0010] Preferably, the outer surface of the raised ring in the middle of the upper cover is provided with threads.

[0011] Preferably, an opening groove is provided on the upper side of the middle portion of the right side of the lower cover.

[0012] Preferably, a spring seat is provided on the left and right sides of the middle part of the inner seat respectively, and a bolt III is provided on the front and rear sides of the upper middle part of the two spring seats respectively, and each spring seat is fixedly installed on the left and right sides of the middle part of the inner seat by the two bolts III thereon, and a wiring opening is provided in the middle part of the right spring seat, and a wire entry pipe is fixed and connected to the middle part of the right side of the right spring seat, and the right side of the wire entry pipe extends outward through the opening groove located on the lower cover.

[0013] Preferably, the two spring seats are arranged in mirror image.

[0014] Preferably, a spring is respectively provided on the front and rear sides of each spring seat, and a spring stop wire is respectively sleeved on the upper and lower sides of each spring. The two spring stop wires located on the upper sides of the two springs on the left spring seat are respectively installed on the front and rear sides of the left spring seat, the two spring stop wires located on the upper sides of the two springs on the right spring seat are respectively installed on the front and rear sides of the right spring seat, the spring stop wires located at the bottom of the two springs on the right side are respectively installed on the front and rear sides of the middle part of the upper side of the deformation seat on the right side, and the spring stop wires located at the bottom of the two springs on the left side are respectively installed on the front and rear sides of the middle part of the upper side of the deformation seat on the left side.

[0015] Preferably, each of the springs is a tension spring.

[0016] Beneficial effects: It is convenient to provide a piezoelectric objective lens positioning device with large load-bearing and decoupling capabilities and high precision. It is convenient for the table to carry the objective lens to move in a small range and high precision along the vertical direction, so that the microscope can perform high-precision zooming to improve the imaging effect. After the deformation seats on both sides are deformed and the table and the objective lens inside it move, they can quickly and accurately restore the original position, improving the overall structural stability of the device while the internal structure is precise and compact and not easy to be damaged, providing high convenience and precision for the use of the microscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a partial structural schematic diagram of the internal seat of the present invention;

[0019] Figure 2 It is a partial structural schematic diagram of the piezoelectric ceramic of the present invention;

[0020] Figure 3 It is a partial structural schematic diagram of the table top of the present invention;

[0021] Figure 4 It is a partial structural schematic diagram of the flexible hinge I of the present invention;

[0022] Figure 5 It is a partial structural schematic diagram of the spring seat of the present invention;

[0023] Figure 6 It is a partial structural schematic diagram of the spring of the present invention;

[0024] Figure 7 It is a partial structural schematic diagram of the spring stop wire of the present invention;

[0025] Figure 8 It is a partial structural schematic diagram of the upper cover of the present invention;

[0026] Fig. 9 It is a partial structural schematic diagram of the bolt IV of the present invention;

[0027] Fig.10 It is a partial structural schematic diagram of the lower cover of the present invention;

[0028] Fig.11 It is a schematic diagram of the overall structure of the bolt V of the present invention;

[0029] Fig.12 and 13 All of them are schematic diagrams of the overall structure of the present invention;

[0030] Fig.14 It is a schematic diagram of a half-section structure of the upper cover and the lower cover of the present invention;

[0031] Fig.15 It is a schematic diagram of the half-section structure of the upper cover and the lower cover of the present invention when viewed from the bottom;

[0032] Fig.16 Schematic diagram A of another structure of the flexible hinge of the present invention;

[0033] Fig.17 FIG. 1 is a schematic diagram B of another structural form of the flexible hinge of the present invention.

[0034] In the figure: internal seat 101; deformation seat 102; piezoelectric ceramic 103; convex groove Ⅰ104; soft circuit board 105; groove 106; convex groove Ⅱ107; table 201; flexible hinge Ⅰ202; bolt Ⅰ203; flexible hinge Ⅱ204; bolt Ⅱ205; spring seat 301; wire entry tube 302; bolt Ⅲ303; wiring port 304; spring 305; spring wire stop 306; upper cover 401; bolt Ⅳ402; lower cover 501; bolt Ⅴ502; connector A601; internal seat connecting hole A602; flexible hinge A603; table connecting hole A604; flexible hinge B701; table connecting hole B702; internal seat connecting hole B703. DETAILED DESCRIPTION

[0035] A large-load decoupled high-precision piezoelectric objective lens positioning device comprises an inner seat 101, a table 201, an upper cover 401 and a lower cover 501. The upper side of the inner seat 101 is uniformly provided with a plurality of convex grooves Ⅰ104 along the circumferential direction. A flexible hinge Ⅰ202 is fixedly connected in each convex groove Ⅰ104 by a group of bolts Ⅰ203. Another group of bolts Ⅰ203 is provided on the other side of each flexible hinge Ⅰ202. The other sides of the plurality of flexible hinges Ⅰ202 are fixedly installed in the circumferential direction of the upper side of the table 201 by another group of bolts Ⅰ203. The front and rear sides of the bottom of the table 201 are fixedly connected with a flexible hinge Ⅱ204 by a group of bolts Ⅰ203. A convex groove Ⅱ107 is provided on the front and rear sides of the bottom of the inner seat 101. The outer sides of the two flexible hinges Ⅱ204 are fixedly connected in the two convex grooves Ⅱ107 by another group of bolts Ⅰ203.

[0036] A deformation seat 102 is provided on the left and right sides of the bottom of the inner seat 101, and a groove 106 is provided at the bottom of each deformation seat 102. A bolt II 205 is provided on the left and right sides of the bottom of the table 201, and the left and right sides of the bottom of the table 201 are installed in the two grooves 106 through two bolts II 205.

[0037] A piezoelectric ceramic 103 is respectively provided at the four corners of the middle part of the inner seat 101. The bottoms of the two piezoelectric ceramics 103 on the left side are respectively in contact with the front and rear upper surfaces of the deformation seat 102 on the left side, and the bottoms of the two piezoelectric ceramics 103 on the right side are respectively in contact with the front and rear upper surfaces of the deformation seat 102 on the right side.

[0038] An upper cover 401 is provided on the upper side of the inner seat 101 , and a plurality of bolts IV402 are evenly provided on the outer side of the upper cover 401 along the circumferential direction. The upper cover 401 is fixedly mounted on the upper side of the inner seat 101 by the plurality of bolts IV402 , and a raised ring is provided in the middle of the upper cover 401 .

[0039] A lower cover 501 is provided at the bottom of the inner seat 101 . Two bolts V502 are provided at the front and rear sides of the bottom of the lower cover 501 . The lower cover 501 is fixedly mounted on the bottom of the inner seat 101 by the four bolts V502 .

[0040] This part is based on Figure 1-16 The working process expressed in the figure is: in order to provide a piezoelectric objective lens positioning device with large load-bearing and decoupling capabilities and high precision, when in use, the objective lens used by the microscope is installed in the table 201, and is fixed to the upper and lower positions of the outer side of the internal seat 101 by means of the upper cover 401 and the lower cover 501 by means of bolt structures, so as to improve the external airtightness of the overall device, make the structure more symmetrical and compact and beautiful, and install the upper side of the table 201 on the internal seat 101 through a plurality of flexible hinges Ⅰ202 evenly arranged in the circumferential direction. The bottom of the table 201 is synchronously installed in the internal seat 101 through two flexible hinges II 204, which improves the stability of the table 201 in the internal seat 101. At the same time, the table 201 can offset to the greatest extent the degree to which the internal seat 101 is subjected to external forces and transmitted to the table 201 and the objective lens inside the table 201 by using the arrangement of multiple flexible hinges I 202 and flexible hinges II 204, thereby improving the decoupling ability of the overall device and further improving the ability of the table 201 to carry heavier objective lenses.

[0041] When the table 201 is moved vertically with the objective lens in a small range and with high precision, so that the microscope can perform high-precision zooming to improve the imaging effect, the four piezoelectric ceramics 103 are energized at the same time, so that the four piezoelectric ceramics 103 are synchronously deformed in the vertical direction, and then the two corresponding deformation seats 102 are pushed downward by the four piezoelectric ceramics 103 to bend downward, thereby driving the table 201 and the objective lens therein to move vertically, so that the table 201 can move vertically with the objective lens in a small range and with high precision, so that the microscope can perform high-precision zooming to improve the imaging effect, and then the device is installed on the microscope through the raised ring in the middle of the upper side of the upper cover 401 to use.

[0042] The outer surface of the inner seat 101 is wrapped and mounted with a flexible circuit board 105 .

[0043] This part is based on Figure 1-16 The working process expressed therein is: when the four piezoelectric ceramics 103 are energized and caused to deform synchronously, the soft circuit board 105 wrapped on the outer surface of the inner seat 101 is energized to provide power.

[0044] The outer surface of the raised ring in the middle of the upper cover 401 is provided with threads.

[0045] This part is based on Figure 1-16The working process expressed therein is: a thread is provided on the outer surface of the raised ring in the middle of the upper cover 401, so that the thread of the raised ring on the upper cover 401 can be installed on the microscope used.

[0046] An opening groove is provided on the upper side of the middle portion of the right side of the lower cover 501 .

[0047] A spring seat 301 is provided on the left and right sides of the middle of the inner seat 101, and a bolt III 303 is provided on the front and rear sides of the upper middle of the two spring seats 301, respectively. Each spring seat 301 is fixedly installed on the left and right sides of the middle of the inner seat 101 by the two bolts III 303 thereon, and a wiring opening 304 is provided in the middle of the right spring seat 301. A wire entry pipe 302 is fixed and connected to the middle of the right side of the right spring seat 301, and the right side of the wire entry pipe 302 extends outward through the opening groove located on the lower cover 501.

[0048] This part is based on Figure 1-16 The working process expressed therein is: when the line is docked and installed in the overall device, the docked line is extended into the line entry tube 302, and is routed through the routing port 304 located on the right spring seat 301 and connected to the soft circuit board 105 for power-on work, and then the soft circuit board 105 is used to supply power to each piezoelectric ceramic 103, thereby realizing the deformation of the deformation seats 102 on both sides and driving the table 201 to rise and fall.

[0049] The two spring seats 301 are arranged in mirror image.

[0050] A spring 305 is respectively provided on the front and rear sides of each spring seat 301, and a spring stop wire 306 is respectively sleeved on the upper and lower sides of each spring 305. The two spring stop wires 306 located on the upper sides of the two springs 305 on the left spring seat 301 are respectively installed on the front and rear sides of the left spring seat 301, and the two spring stop wires 306 located on the upper sides of the two springs 305 on the right spring seat 301 are respectively installed on the front and rear sides of the right spring seat 301, the spring stop wires 306 located at the bottom of the two springs 305 on the right are respectively installed on the front and rear sides of the middle of the upper side of the deformation seat 102 on the right, and the spring stop wires 306 located at the bottom of the two springs 305 on the left are respectively installed on the front and rear sides of the middle of the upper side of the deformation seat 102 on the left.

[0051] Each of the springs 305 is a tension spring.

[0052] This part is based on Figure 1-16The working process expressed therein is: in order to facilitate the deformation seats 102 located on both sides of the bottom of the internal seat 101 to have the force to restore the original position while being deformed, and to enable the table 201 to restore its original position, when in use, the deformation seats 102 on both sides are deformed and bent in the vertical direction, and the two spring stop wires 306 on each deformation seat 102 are pulled in the vertical direction, and the springs 305 corresponding to the two spring stop wires 306 are used to make the springs 305 with contraction force axially stretched, and when each spring 305 has a contraction force, the springs 305 on each side are stretched and deformed so that the corresponding deformation seat 102 has the force to restore the original position when deformed, and then after the deformation seats 102 on both sides are deformed and the table 201 and the objective lens inside it are moved, they can quickly and accurately restore the original position, thereby improving the structural stability of the overall device while the internal structure is precise and compact and not easy to be damaged, providing high convenience and accuracy for the use of the microscope.

[0053] Working principle: This part is based on Figure 1-16 The working process expressed in the figure is: in order to provide a piezoelectric objective lens positioning device with large load-bearing and decoupling capabilities and high precision, when in use, the objective lens used by the microscope is installed in the table 201, and is fixed to the upper and lower positions of the outer side of the internal seat 101 by means of the upper cover 401 and the lower cover 501 by means of bolt structures, so as to improve the external airtightness of the overall device, make the structure more symmetrical and compact and beautiful, and install the upper side of the table 201 on the internal seat 101 through a plurality of flexible hinges Ⅰ202 evenly arranged in the circumferential direction. The bottom of the table 201 is synchronously installed in the internal seat 101 through two flexible hinges II 204, which improves the stability of the table 201 in the internal seat 101. At the same time, the table 201 can offset to the greatest extent the degree to which the internal seat 101 is subjected to external forces and transmitted to the table 201 and the objective lens inside the table 201 by using the arrangement of multiple flexible hinges I 202 and flexible hinges II 204, thereby improving the decoupling ability of the overall device and further improving the ability of the table 201 to carry heavier objective lenses.

[0054] When the table 201 is moved vertically with the objective lens in a small range and with high precision, so that the microscope can perform high-precision zooming to improve the imaging effect, the four piezoelectric ceramics 103 are energized at the same time, so that the four piezoelectric ceramics 103 are synchronously deformed in the vertical direction, and then the two corresponding deformation seats 102 are pushed downward by the four piezoelectric ceramics 103 to bend downward, thereby driving the table 201 and the objective lens therein to move vertically, so that the table 201 can move vertically with the objective lens in a small range and with high precision, so that the microscope can perform high-precision zooming to improve the imaging effect, and then the device is installed on the microscope through the raised ring in the middle of the upper side of the upper cover 401 to use.

[0055] This part is based on Figure 1-16 The working process expressed therein is: when the four piezoelectric ceramics 103 are energized and caused to deform synchronously, the soft circuit board 105 wrapped on the outer surface of the inner seat 101 is energized to provide power.

[0056] This part is based on Figure 1-16 The working process expressed therein is: a thread is provided on the outer surface of the raised ring in the middle of the upper cover 401, so that the thread of the raised ring on the upper cover 401 can be installed on the microscope used.

[0057] This part is based on Figure 1-16 The working process expressed therein is: when the line is docked and installed in the overall device, the docked line is extended into the line entry tube 302, and is routed through the routing port 304 located on the right spring seat 301 and connected to the soft circuit board 105 for power-on work, and then the soft circuit board 105 is used to supply power to each piezoelectric ceramic 103, thereby realizing the deformation of the deformation seats 102 on both sides and driving the table 201 to rise and fall.

[0058] This part is based on Figure 1-16 The working process expressed therein is: in order to facilitate the deformation seats 102 located on both sides of the bottom of the internal seat 101 to have the force to restore the original position while being deformed, and to enable the table 201 to restore its original position, when in use, the deformation seats 102 on both sides are deformed and bent in the vertical direction, and the two spring stop wires 306 on each deformation seat 102 are pulled in the vertical direction, and the springs 305 corresponding to the two spring stop wires 306 are used to make the springs 305 with contraction force axially stretched, and when each spring 305 has a contraction force, the springs 305 on each side are stretched and deformed so that the corresponding deformation seat 102 has the force to restore the original position when deformed, and then after the deformation seats 102 on both sides are deformed and the table 201 and the objective lens inside it are moved, they can quickly and accurately restore the original position, thereby improving the structural stability of the overall device while the internal structure is precise and compact and not easy to be damaged, providing high convenience and accuracy for the use of the microscope.

[0059] The flexible hinge form is not limited to the flexible hinge I and flexible hinge II mentioned in the article. Possible structural styles can also be as follows Fig.16 As shown. The flexible hinge A603 connects the inner seat and the table top through the connecting holes 602 and 604. Fig.17 In the figure, the flexible hinge B701 connects the inner seat and the table top together through the connecting holes 702 and 703. The principles of several structural styles are the same.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-load decoupled high-precision piezoelectric objective lens positioning device, comprising an inner seat (101), a table (201), an upper cover (401) and a lower cover (501), characterized in that: The upper side of the inner seat (101) is uniformly provided with a plurality of convex grooves I (104) along the circumferential direction, each convex groove I (104) is fixedly connected with a flexible hinge I (202) via a group of bolts I (203), the other side of each flexible hinge I (202) is provided with another group of bolts I (203), the other sides of the plurality of flexible hinges I (202) are fixedly mounted on the upper circumferential direction of the table top (201) via another group of bolts I (203), the front and rear sides of the bottom of the table top (201) are fixedly connected with a flexible hinge II (204) via a group of bolts I (203), the front and rear sides of the bottom of the inner seat (101) are respectively provided with a convex groove II (107), the outer sides of the two flexible hinges II (204) are respectively fixedly connected to the two convex grooves II (107) via another group of bolts I (203); A deformation seat (102) is provided on the left and right sides of the bottom of the inner seat (101), and a groove (106) is provided on the bottom of each deformation seat (102). A bolt II (205) is provided on the left and right sides of the bottom of the table top (201), and the left and right sides of the bottom of the table top (201) are installed in the two grooves (106) via two bolts II (205). A piezoelectric ceramic (103) is provided at each of the four corners of the middle of the inner seat (101); the bottoms of the two piezoelectric ceramics (103) located on the left side are in contact with the front and rear upper surfaces of the deformation seat (102) located on the left side, respectively; and the bottoms of the two piezoelectric ceramics (103) located on the right side are in contact with the front and rear upper surfaces of the deformation seat (102) located on the right side, respectively; An upper cover (401) is provided on the upper side of the inner seat (101), a plurality of bolts IV (402) are evenly arranged on the outer side of the upper cover (401) along the circumferential direction, the upper cover (401) is fixedly mounted on the upper side of the inner seat (101) by means of the plurality of bolts IV (402), and a raised ring is provided in the middle of the upper cover (401); A lower cover (501) is provided at the bottom of the inner seat (101), and two bolts V (502) are respectively provided at the front and rear sides of the bottom of the lower cover (501). The lower cover (501) is fixedly mounted on the bottom of the inner seat (101) by means of the four bolts V (502).

2. A large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 1, characterized in that: A soft circuit board (105) is mounted on the outer surface of the inner seat (101).

3. A large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 1, characterized in that: The outer surface of the raised ring in the middle of the upper cover (401) is provided with threads.

4. The large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 1, characterized in that: An open groove is provided on the upper side of the middle portion of the right side of the lower cover (501).

5. The large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 1, characterized in that: A spring seat (301) is provided on the left and right sides of the middle of the inner seat (101), and a bolt III (303) is provided on the front and rear sides of the middle of the upper sides of the two spring seats (301). Each spring seat (301) is fixedly mounted on the left and right sides of the middle of the inner seat (101) by means of the two bolts III (303) thereon. A wiring opening (304) is provided in the middle of the right spring seat (301). A wire entry pipe (302) is fixed and connected to the middle of the right side of the right spring seat (301), and the right side of the wire entry pipe (302) extends outward through an open slot on the lower cover (501).

6. A large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 5, characterized in that: The two spring seats (301) are arranged in mirror image.

7. A large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 6, characterized in that: A spring (305) is respectively provided on the front and rear sides of each spring seat (301); a spring stop wire (306) is respectively sleeved on the upper and lower sides of each spring (305); the two spring stop wires (306) located on the upper sides of the two springs (305) on the left spring seat (301) are respectively installed on the front and rear sides of the left spring seat (301); the two spring stop wires (306) located on the upper sides of the two springs (305) on the right spring seat (301) are respectively installed on the front and rear sides of the right spring seat (301); the spring stop wires (306) located at the bottom of the two springs (305) on the right are respectively installed on the front and rear sides of the middle of the upper side of the deformation seat (102) on the right; and the spring stop wires (306) located at the bottom of the two springs (305) on the left are respectively installed on the front and rear sides of the middle of the upper side of the deformation seat (102) on the left.

8. The large load-bearing decoupled high-precision piezoelectric objective lens positioning device according to claim 7, characterized in that: Each of the springs (305) is a tension spring.

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