Triple zoom endoscope bayonet lens

Abstract

The utility model discloses a triple zoom endoscope bayonet lens, which relates to the technical field of endoscopes and comprises a front fixing group, a zoom group and a rear fixing group. The front fixing group, the zooming group and the rear fixing group are arranged in parallel along the same axial direction; the zooming group is located between the front fixing group and the rear fixing group, and the zooming group is movably arranged between the front fixing group and the rear fixing group. The utility model provides a zoom bayonet lens capable of realizing continuous change of focal length in a range of 20mm to 60mm, which can be simultaneously adapted to laparoscopes with larger calibers and endoscopes such as paranasal sinoscopes, arthroscopes, otoscopes and the like with smaller calibers in the market, and locally magnifies observation details through zooming in the use process, the imaging area covers the whole receiver, and the imaging effect is good. And diagnosis and treatment of doctors are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of endoscope technology, and in particular to a 3x zoom endoscope mount lens. Background Technology

[0002] Currently, most bayonet lenses compatible with endoscopes on the market are fixed-focus with a focal length of 25mm. For example, the light emitted from the eyepiece of a laparoscope has an angle of 14° to 16°, and the image formed by the light through a 25mm focal length bayonet lens can completely cover a 1 / 3-inch receiver. However, the light emitted from the endpiece of small-diameter endoscopes such as otoscopes, arthroscopes, and sinusoscopes has an angle of 6° to 8°, and the image area formed by the light through a 25mm focal length bayonet lens is a circular area tangent to the 1 / 3-inch receiver. This means that the fixed-focus bayonet lenses used on current endoscopes cannot achieve focusing functionality, have low compatibility with different types of endoscopes, and the imaging area cannot cover the entire receiver, affecting the quality of diagnosis and treatment for doctors. Therefore, a 3x zoom endoscope bayonet lens is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a 3x zoom endoscope mount lens to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a 3x zoom endoscope mount lens, comprising a front fixed group, a zoom group, and a rear fixed group;

[0005] The front fixing group, the zoom group, and the rear fixing group are arranged parallel to each other along the same axial direction.

[0006] The zoom group is located between the front fixed group and the rear fixed group, and the zoom group is movably positioned between the front fixed group and the rear fixed group.

[0007] Preferably, the front fixing group includes a first cemented doublet lens group and a third lens. The first cemented doublet lens group is disposed on the side of the third lens away from the zoom group. The first cemented doublet lens group is used for beam convergence, and the third lens is used for beam divergence.

[0008] Preferably, the zoom group includes lens four, a second cemented doublet group, lens seven, and lens eight. Lens four, the second cemented doublet group, lens seven, and lens eight are arranged in parallel along the same axis, with lens four located on the side closer to lens three and lens eight located on the side closer to the rear fixing group.

[0009] Preferably, the rear fixing group includes lens nine, which is disposed on the side of lens eight opposite to lens seven.

[0010] Preferably, the first doublet lens assembly includes a first lens and a second lens, wherein the second lens is disposed on the side of the first lens close to the third lens.

[0011] Preferably, the second doublet lens assembly includes lens five and lens six, with lens five disposed on the side of lens six near lens four.

[0012] Preferably, lenses one, six, and eight all have positive optical power, while lenses two, three, four, five, seven, and nine all have negative optical power.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] This invention provides a zoom mount lens that can continuously change the focal length within the range of 20mm to 60mm. It can be used with both large-diameter laparoscopes and small-diameter endoscopes such as sinus endoscopes, arthroscopes, and otoscopes on the market. During use, the zoom can be used to magnify the details of the observation, and the imaging area covers the entire receiver, which is convenient for doctors to diagnose and treat. Attached Figure Description

[0015] Figure 1 This is one of the front view structural schematic diagrams of this utility model.

[0016] Figure 2 This is the second front view structural schematic diagram of this utility model.

[0017] In the diagram: 100, front fixation group; 101, first cemented doublet lens group; 111, lens one; 112, lens two; 102, lens three;

[0018] 200. Magnification group; 201. Lens four; 202. Second cemented doublet group; 221. Lens five; 222. Lens six; 203. Lens seven; 204. Lens eight;

[0019] 300, Rear Fixed Assembly; 301, Lens Nine. Detailed Implementation

[0020] 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.

[0021] This utility model provides, for example Figures 1-2 The image shows a 3x zoom endoscope mount lens, in which... Figure 1 The middle section shows the structural distribution of a 3x zoom lens mount. Figure 2 This diagram illustrates the structural distribution of a 1x zoom lens mount, including a front fixed group 100, a zoom group 200, and a rear fixed group 300. The front fixed group 100, zoom group 200, and rear fixed group 300 are arranged parallel to each other along the same axis. The zoom group 200 is located between the front fixed group 100 and the rear fixed group 300, and is movably disposed between them. In this embodiment, the endoscope mount lens composed of the front fixed group 100, zoom group 200, and rear fixed group 300 can be fixed by the spacing between the front fixed group 100 and the rear fixed group 300. The axial movement of the zoom group 200 between the front fixed group 100 and the rear fixed group 300 adjusts the distance between the zoom group 200 and the front fixed group 100 and the rear fixed group 300 (the adjustable range of the zoom group 200 is 20mm-60mm). This allows the endoscope mount lens to magnify details during use by zooming, so that the imaging area covers the entire receiver, improving the clarity of the imaging area. This facilitates diagnosis and treatment by doctors using the endoscope, and also allows the endoscope mount lens to be used with various types of endoscopes, improving the adaptability of the mount lens.

[0022] Further, the front fixed assembly 100 includes a first cemented doublet lens assembly 101 and a third lens 102. The first cemented doublet lens assembly 101 is used for beam convergence, and the third lens 102 is used for beam divergence. The first cemented doublet lens assembly 101 is located on the side of the third lens 102 away from the zoom assembly 200. The first cemented doublet lens assembly 101 includes a first lens 111 and a second lens 112. The second lens 112 is located on the side of the first lens 111 closer to the third lens 102. The first lens 111 and the second lens 112 are fixed together by cementing. The first lens 111 has positive optical power. Lens 112 has negative optical power, and the first cemented doublet 101 formed by the two has positive optical power. The parallel light emitted from the endoscope converges after passing through lens 111 and lens 112 in sequence, which reduces the outer diameter of the optical lens. Lens 102 has negative optical power, which can diverge the light beam and increase the optical path so that the light beam can be completely incident into the zoom group 200, which facilitates the movement of the zoom group 200. The negative optical power lens 102, together with the positive optical power first cemented doublet 101, can balance primary aberrations, such as spherical aberration, coma, and distortion.

[0023] Furthermore, the zoom group 200 includes lens four 201, a second cemented doublet group 202, lens seven 203, and lens eight 204. Lens four 201, the second cemented doublet group 202, lens seven 203, and lens eight 204 are arranged parallel to each other along a coaxial axis. Lens four 201 is located on the side closer to lens three 102, and lens eight 204 is located on the side closer to the rear fixing group 300. The second cemented doublet group 202 includes lens five 221 and lens six 222. Lens five 221 is disposed on the side of lens six 222 closer to lens four 201. Lens 201 has negative optical power, which can diffuse the light beam to match the target size of the receiver. Lens 221 in the second cemented doublet 202 is a meniscus lens with negative optical power, and lens 222 is a meniscus thick lens with positive optical power. The two are fixed by cementing. The combination of the two in the second cemented doublet 202 has positive optical power, which can reduce the focal length and achromatic effect. Lens 203 has negative optical power, which can further expand the light beam, and lens 204 has positive optical power, which can deflect the light path and reduce the divergence angle of the light, thereby reducing the beam aperture.

[0024] Furthermore, the rear fixed assembly 300 includes a lens 9 301, which is located on the side of the lens 8 204 away from the lens 7 203. The principal ray of the beam emitted from the side of the lens 9 301 is parallel to the principal optical axis, ensuring a large depth of focus and a back cutoff of 15mm, which facilitates the installation and adjustment of the receiver.

[0025] It should be noted that the table below shows the data ranges for radius of curvature (mm), refractive index, and Abbe number for Lens 1 (111), Lens 2 (112), Lens 3 (102), Lens 4 (201), Lens 5 (221), Lens 6 (222), Lens 7 (203), Lens 8 (204), and Lens 9 (301).

[0026]

[0027]

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A 3x zoom endoscope mount lens, characterized in that, It includes a front fixed group (100), a variable magnification group (200), and a rear fixed group (300); The front fixing group (100), the variable magnification group (200), and the rear fixing group (300) are arranged in parallel along the same axis; The zoom group (200) is located between the front fixed group (100) and the rear fixed group (300), and the zoom group (200) is movably disposed between the front fixed group (100) and the rear fixed group (300). The zoom group (200) includes lens four (201), second cemented doublet group (202), lens seven (203) and lens eight (204). Lens four (201), second cemented doublet group (202), lens seven (203) and lens eight (204) are arranged in parallel along the same axis. Lens four (201) is located on the side closer to lens three (102), and lens eight (204) is located on the side closer to the rear fixed group (300). The second cemented doublet group (202) includes lens five (221) and lens six (222). Lens five (221) is disposed on the side of lens six (222) closer to lens four (201).

2. The 3x zoom endoscope mount lens according to claim 1, characterized in that, The front fixed group (100) includes a first cemented doublet group (101) and a third lens (102). The first cemented doublet group (101) is disposed on the side of the third lens (102) away from the zoom group (200). The first cemented doublet group (101) is used for beam convergence, and the third lens (102) is used for beam divergence.

3. A 3x zoom endoscope mount lens according to claim 2, characterized in that, The rear fixing assembly (300) includes a lens nine (301), which is disposed on the side of the lens eight (204) away from the lens seven (203).

4. A 3x zoom endoscope mount lens according to claim 3, characterized in that, The first double-cemented lens assembly (101) includes a first lens (111) and a second lens (112), wherein the second lens (112) is disposed on the side of the first lens (111) near the third lens (102).

5. A 3x zoom endoscope mount lens according to claim 4, characterized in that, Lens 1 (111), Lens 6 (222) and Lens 8 (204) all have positive optical power, while Lens 2 (112), Lens 3 (102), Lens 4 (201), Lens 5 (221), Lens 7 (203) and Lens 9 (301) all have negative optical power.

Images