Flat-field achromatic objective lens with high resolution

Abstract

The utility model belongs to the field of objective lenses, and particularly relates to a flat-field achromatic objective lens with high resolution, which comprises a lens barrel, a connecting seat is fixedly connected to the top of the lens barrel, a threaded groove is arranged on the surface of the connecting seat, and a connecting barrel is slidably sleeved on the outer side of the lens barrel. Two symmetrically distributed push blocks are fixedly connected to the outer side of the connecting cylinder, a fixing seat is connected to the interior of the connecting cylinder through threads, a lens is slidably connected to the interior of the fixing seat in a sleeved mode, an adjusting mechanism is arranged on the connecting cylinder, and a connecting mechanism is arranged on the lens. According to the utility model, the clamping balls are inserted into the grooves, so that the relative positions of the connecting barrel and the lens barrel can be connected and fixed, the connecting barrel can be driven to move when the push block is pushed, the clamping balls can be driven to move immediately, the clamping balls can be inserted and matched with the grooves at other positions, and the relative positions of the connecting barrel and the lens barrel can be conveniently adjusted and fixed; the use length of the objective lens can be flexibly adjusted.

Description

Technical Field

[0001] This utility model relates to the field of objective lens technology, specifically a high-resolution plan achromatic objective lens. Background Technology

[0002] A plan achromatic objective is an optical element used to correct chromatic aberration in microscopes. Plan achromatic objectives can simultaneously correct both spherical aberration and chromatic aberration of the lens, enabling clear and accurate images to be obtained during microscopic observation without being affected by chromatic aberration.

[0003] Utility model patent CN219657932U discloses a plan-field achromatic infinity-corrected objective lens, relating to the field of objective lens technology. It includes a lens barrel with a threaded tube fixed at its front end and a sleeve at the front end. The sleeve has an internal clamping groove, into which the threaded tube is inserted and connected by threads. A threaded connecting seat is fixed at the rear of the lens barrel. A front fixing seat is located at the front end of the sleeve, housing a first lens. An internal sleeve is located at the rear end of the first lens, and a first clamping seat is fixed at the rear end of the internal sleeve. A second lens is held in the first clamping seat. A tightening mechanism is located at the rear end of the internal sleeve, and a second clamping seat is located at the rear end of the tightening mechanism. A third and fourth lens are sequentially held in the second clamping seat. This utility model allows for adjustment of the lens barrel length via a sliding mechanism, making it suitable for different environments. It features a stable structure, strong practicality, and is suitable for widespread application.

[0004] In existing technology, the objective lens can be adjusted in length via a threaded connection. However, this threaded adjustment requires frequent rotation, and the threads wear down over time, affecting the thread fit. Furthermore, it is inconvenient to adjust the length and does not provide adequate protection for the lens, making it susceptible to damage from impacts. Therefore, improvements are needed. Utility Model Content

[0005] The purpose of this invention is to provide a high-resolution plan achromatic objective lens, which solves the problem of inconvenient objective lens length adjustment and the problem of inconvenient lens protection.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-resolution plan achromatic objective lens, comprising a lens barrel, a connecting seat fixedly connected to the top of the lens barrel, a threaded groove formed on the surface of the connecting seat, a connecting cylinder slidably sleeved on the outer side of the lens barrel, two symmetrically distributed push blocks fixedly connected to the outer side of the connecting cylinder, a fixed seat threadedly connected to the inside of the connecting cylinder, a lens slidably sleeved inside the fixed seat, an adjustment mechanism provided on the connecting cylinder, and a connecting mechanism provided on the lens.

[0007] Preferably, the adjustment mechanism includes a groove, with a groove formed inside the lens barrel. A retaining ball is engaged inside the groove, and the retaining ball is movably connected to a connecting cylinder. A slider is movably adjusted outside the retaining ball, and the slider is slidably connected to the connecting cylinder and a push block. A fixing rod is slidably sleeved inside the slider, and the fixing rod is fixedly connected to the push block. A first spring is provided on the outside of the fixing rod. This adjustment mechanism allows for convenient and flexible adjustment of the objective lens's working length.

[0008] Preferably, there are multiple grooves, which are evenly distributed inside the lens barrel. By designing multiple grooves, the ball can be inserted into the grooves at different positions.

[0009] Preferably, one end of the first spring is fixedly connected to the slider, and the other end of the first spring is fixedly connected to the push block. By designing the first spring, the force of the first spring can be applied to the slider.

[0010] Preferably, the connecting mechanism includes a mounting plate, which is fixedly sleeved on the outer side of the lens. The mounting plate is slidably connected to a fixing seat. A connecting rod is slidably sleeved inside the mounting plate, and the connecting rod contacts the fixing seat. A second spring is provided on the outer side of the connecting rod. A bolt is threadedly connected inside the fixing seat, and a mounting block is slidably sleeved on the outer side of the bolt. The mounting block is slidably connected to the fixing seat and contacts the connecting rod. By designing the connecting mechanism, the lens can be protected from impact and the lens can be easily disassembled.

[0011] Preferably, one end of the second spring is slidably connected to the mounting plate, and the other end of the second spring contacts the mounting block. By designing the second spring, its force can be applied to the mounting plate.

[0012] Preferably, the mounting block has a through groove inside, and a bolt is slidably connected inside the through groove. By designing the through groove, the bolt can slide inside the mounting block.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model, through the design of the insertion of the retaining ball and the groove, can connect and fix the relative position of the connecting tube and the lens barrel. When the push block is pushed, the connecting tube can be moved, which in turn can move the retaining ball. This allows the retaining ball to be inserted and matched with the grooves in other positions, making it convenient to adjust and fix the relative position of the connecting tube and the lens barrel, and facilitating flexible adjustment of the objective lens's working length.

[0015] 2. By designing the second spring, when the lens is impacted, the impact force will push the lens into the fixing seat, causing the mounting plate to squeeze the second spring. Under the elastic action of the second spring, the impact force can be buffered, reducing the impact force on the lens and reducing damage to the lens. The lens can also be easily removed from the fixing seat, facilitating lens maintenance or replacement. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A partial three-dimensional sectional view of the structure;

[0018] Figure 3 This utility model Figure 2 Enlarged view of point A;

[0019] Figure 4 This utility model Figure 2 The front sectional view of the fixed base.

[0020] In the diagram: 1. Lens tube; 2. Connecting seat; 3. Connecting cylinder; 4. Push block; 5. Fixing seat; 6. Lens; 8. Adjustment mechanism; 9. Connecting mechanism; 81. Groove; 82. Ball retainer; 83. Slider; 84. Fixing rod; 85. First spring; 91. Mounting plate; 92. Connecting rod; 93. Second spring; 94. Bolt; 95. Mounting block; 96. Through groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 , Figure 2 A high-resolution plan achromatic objective lens includes a lens barrel 1, a connecting seat 2 fixedly connected to the top of the lens barrel 1, a threaded groove on the surface of the connecting seat 2, a connecting cylinder 3 slidably sleeved on the outside of the lens barrel 1, two symmetrically distributed push blocks 4 fixedly connected to the outside of the connecting cylinder 3, a fixing seat 5 threadedly connected to the inside of the connecting cylinder 3, a lens 6 slidably sleeved inside the fixing seat 5, an adjustment mechanism 8 provided on the connecting cylinder 3, and a connecting mechanism 9 provided on the lens 6.

[0023] Please see Figure 1 , Figure 2 , Figure 3 The adjustment mechanism 8 includes a groove 81. The inside of the lens barrel 1 has a groove 81, and a retaining ball 82 is engaged inside the groove 81. There are multiple grooves 81, which are evenly distributed inside the lens barrel 1. By designing multiple grooves 81, the retaining ball 82 can be engaged into the grooves 81 at different positions. The retaining ball 82 is movably connected to the connecting cylinder 3. A slider 83 is movably adjusted on the outside of the retaining ball 82. The slider 83 is slidably connected to the connecting cylinder 3 and movably connected to the push block 4. A fixing rod 84 is slidably sleeved inside the slider 83 and fixedly connected to the push block 4. A first spring 85 is provided on the outside of the fixing rod 84. One end of the first spring 85 is fixedly connected to the slider 83, and the other end of the first spring 85 is fixedly connected to the push block 4. By designing the first spring 85, the force of the first spring 85 can be applied to the slider 83. By designing the adjustment mechanism 8, the length of the objective lens can be easily and flexibly adjusted.

[0024] Please see Figure 1 , Figure 2 , Figure 4 The connecting mechanism 9 includes a mounting plate 91. The mounting plate 91 is fixedly sleeved on the outer side of the lens 6. The mounting plate 91 is slidably connected to the fixing seat 5. A connecting rod 92 is slidably sleeved inside the mounting plate 91. The connecting rod 92 contacts the fixing seat 5. A second spring 93 is provided on the outer side of the connecting rod 92. One end of the second spring 93 is slidably connected to the mounting plate 91, and the other end of the second spring 93 contacts the mounting block 95. By designing the second spring 93, the force of the second spring 93 can act on the mounting plate 91. A bolt 94 is threadedly connected inside the fixing seat 5. The mounting block 95 is slidably sleeved on the outer side of the bolt 94. A through groove 96 is opened inside the mounting block 95. The bolt 94 is slidably connected inside the through groove 96. By designing the through groove 96, the bolt 94 can slide inside the mounting block 95. The mounting block 95 is slidably connected to the fixing seat 5 and contacts the connecting rod 92. By designing the connecting mechanism 9, the lens 6 can be protected from collision and the lens 6 can be easily disassembled.

[0025] The specific implementation process of this utility model is as follows: When it is necessary to adjust the length of the objective lens, push the push block 4 directly. The push block 4 drives the connecting cylinder 3 to move, and the connecting cylinder 3 drives the retaining ball 82 to move. The retaining ball 82 rolls along the arc surface of the groove 81. The retaining ball 82 will be squeezed and move horizontally. The retaining ball 82 will drive the slider 83 to move horizontally. The slider 83 will slide along the fixed rod 84. At the same time, the slider 83 squeezes the first spring 85, which can separate the retaining ball 82 from the groove 81. As the connecting cylinder 3 slides in the vertical direction, the elastic action of the first spring 85 will give the slider 83 a counter-pushing force, which can push the retaining ball 82 into the groove 81 at another position. At this time, the relative position of the connecting cylinder 3 and the lens barrel 1 can be adjusted and fixed, which facilitates flexible adjustment of the length of the objective lens.

[0026] When lens 6 is impacted during use, the impact force will push lens 6 into the fixed seat 5, causing mounting plate 91 to slide along connecting rod 92 and compress second spring 93. Under the elastic action of second spring 93, the impact force can be buffered, reducing the impact force on lens 6 and reducing damage to lens 6. When lens 6 needs to be disassembled, first remove fixed seat 5, then remove bolt 94 from inside fixed seat 5, and then mounting block 95 can be directly removed from inside fixed seat 5. Then connecting rod 92, mounting plate 91 and lens 6 can be removed, making it convenient to maintain or replace lens 6.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flat-field apochromatic objective with high resolution, comprising an objective tube (1), characterized in that: The top of the lens barrel (1) is fixedly connected with a connecting seat (2), the surface of the connecting seat (2) is provided with a threaded groove, the outer side of the lens barrel (1) is slidably sleeved with a connecting barrel (3), the outer side of the connecting barrel (3) is fixedly connected with two push blocks (4) which are symmetrically distributed, the inside of the connecting barrel (3) is threadedly connected with a fixing seat (5), the inside of the fixing seat (5) is slidably sleeved with a lens (6), the connecting barrel (3) is provided with an adjusting mechanism (8), and the lens (6) is provided with a connecting mechanism (9).

2. The flat-field achromatic objective lens with high resolution according to claim 1, characterized in that: The adjusting mechanism (8) comprises a groove (81), the inside of the lens barrel (1) is provided with the groove (81), the inside of the groove (81) is clamped with a clamping ball (82), the clamping ball (82) is movably connected with the connecting barrel (3), the outer side of the clamping ball (82) movably adjusts a sliding block (83), the sliding block (83) is slidably connected with the connecting barrel (3), the sliding block (83) is movably connected with the push block (4), the inside of the sliding block (83) is slidably sleeved with a fixing rod (84), the fixing rod (84) is fixedly connected with the push block (4), and the outer side of the fixing rod (84) is provided with a first spring (85).

3. A flat field apochromatic objective with high resolution according to claim 2, characterized in that: The number of the groove (81) is multiple, and multiple grooves (81) are evenly distributed in the inside of the lens barrel (1).

4. The flat-field achromatic objective lens with high resolution according to claim 2, characterized in that: One end of the first spring (85) is fixedly connected with the sliding block (83), and the other end of the first spring (85) is fixedly connected with the push block (4).

5. The flat-field achromatic objective lens with high resolution according to claim 1, characterized in that: The connecting mechanism (9) comprises a mounting plate (91), the outer side of the lens (6) is fixedly sleeved with the mounting plate (91), the mounting plate (91) is slidably connected with the fixing seat (5), the inside of the mounting plate (91) is slidably sleeved with a connecting rod (92), the connecting rod (92) is in contact with the fixing seat (5), the outer side of the connecting rod (92) is provided with a second spring (93), the inside of the fixing seat (5) is threadedly connected with a bolt (94), the outer side of the bolt (94) is slidably sleeved with a mounting block (95), the mounting block (95) is slidably connected with the fixing seat (5), and the mounting block (95) is in contact with the connecting rod (92).

6. A flat field apochromatic objective with high resolution according to claim 5, characterized in that: One end of the second spring (93) is slidably connected with the mounting plate (91), and the other end of the second spring (93) is in contact with the mounting block (95).

7. A flat field achromatic objective lens with high resolution according to claim 5, characterized in that: The inside of the mounting block (95) is provided with a through groove (96), and the inside of the through groove (96) is slidably connected with the bolt (94).

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