Ultra-slim dual-view zoom endoscope

Abstract

The application discloses a kind of superfine binocular zoom endoscopes, and first optical path and second optical path are symmetrically arranged and constitute double optical path imaging system by side arrangement structure. Each optical path is sequentially provided with negative focus lens group, positive focus lens group and image sensor from object side to image side. Negative focus lens group is composed of single lens with negative optical power and first cemented lens;Positive focus lens group is composed of the diaphragm of the object side of second cemented lens, second cemented lens and third cemented lens. By adjusting the position of positive focus lens group, continuous optical zoom can be realized in the range of 2-100mm object distance, and double focus magnification function is provided, and the highest magnification of 32 inch display can reach 150 times. The application highly integrates binocular stereo imaging and high magnification zoom function in the diameter of only 4mm scope, the maximum outer diameter of single lens is less than 1.5mm, and the MTF value is always kept above 0.2@130lp / mm in the whole zooming process, which perfectly adapts to the full scene surgical needs of neurosurgery "wide-angle positioning-mid-magnification observation-high-magnification fine operation".

Description

Technical Field

[0001] The present invention belongs to the field of medical endoscopes and relates to an ultra-thin binocular zoom endoscope. Background Art

[0002] The core requirements of minimally invasive neurosurgery for binocular neuroendoscopes mainly focus on: the diameter of the endoscope body ≤ 5 mm to adapt to the narrow intracranial operation space, binocular stereoscopic imaging to restore the tissue spatial hierarchy, multi-fold zoom to cover long-distance lesion positioning and close-range fine operation, and stable imaging throughout the zoom range.

[0003] However, the existing technologies have multiple defects that are difficult to balance: firstly, although the scheme of using multiple lens groups and double optical paths can ensure the binocular stereoscopic effect, the diameter of the endoscope body generally exceeds 6 mm, which cannot meet the requirements of the intracranial minimally invasive space; secondly, when adopting the design of "negative focal lens group + two groups of double cemented positive focal lens groups" to streamline the structure, due to insufficient aberration correction, the spatial hierarchy of binocular imaging is lost; thirdly, the object distance coverage range of the zoom function scheme is small, making it difficult to balance long-distance positioning and close-range operation, and the field of view angle is low at high magnification, severely restricting the surgical area view. These defects force operators to frequently adjust the equipment, which not only increases the work burden, but is more likely to cause damage to normal brain tissue due to limited vision and unstable imaging. Therefore, developing an ultra-thin binocular zoom endoscope that adapts to the full-scene requirements of intracranial minimally invasive surgery has urgent clinical application value. Summary of the Invention

[0004] The purpose of the present invention is to provide an ultra-thin binocular zoom endoscope in view of the deficiencies of the prior art. On the premise of ensuring the miniaturization of the endoscope body, this lens simultaneously takes into account 3D stereoscopic imaging, multi-fold continuous zoom, and dual-focus magnification functions to adapt to the core requirements of minimally invasive and precise diagnosis and treatment in the fields of neurosurgery and the like.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An ultra-thin binocular zoom endoscope includes a first optical path and a second optical path arranged side by side, jointly constituting a double-optical-path imaging system; each optical path includes a negative focal lens group, a positive focal lens group, and an image sensor arranged in sequence from the object side to the image side; the negative focal lens group consists of a single lens and a first cemented lens, and its focal length f1 satisfies the conditional formula: -1.0 mm < f1 < -0.7 mm; the positive focal lens group consists of an aperture stop, a second cemented lens, and a third cemented lens, and its focal length f2 satisfies the conditional formula: 1.5 mm < f2 < 2.0 mm, and the aperture stop is closely attached to the object side of the second cemented lens. The endoscope further includes an adjustment mechanism for synchronously driving the positive focal lens groups of the first optical path and the second optical path to be positioned between the negative focal lens group and the image sensor, enabling continuous optical zoom and stable and clear imaging.

[0006] Furthermore, this invention achieves precise aberration correction through the combination design of the optical power distribution of the lens group and the cemented lens. The negative focal lens group uses a combination of negative optical power of a single lens and a cemented lens to offset the spherical aberration contribution of the positive focal lens group. The second cemented lens of the positive focal lens group uses a combination of a meniscus lens and a biconvex lens, and the third cemented lens uses a combination of a biconvex lens and a biconcave lens to synergistically correct astigmatism and chromatic aberration.

[0007] Furthermore, along the optical axis from the object side to the image side, the single lens is a plano-convex lens with negative optical power; in the first cemented lens, the object-side sub-lens is a biconcave lens with negative optical power, and the image-side sub-lens is a biconvex lens with positive optical power; in the second cemented lens, the object-side sub-lens is a meniscus lens with negative optical power, and the image-side sub-lens is a biconvex lens with positive optical power; in the third cemented lens, the object-side sub-lens is a biconvex lens with positive optical power, and the image-side sub-lens is a biconcave lens with negative optical power. Furthermore, the focal length of the single lens is negative; The focal length of the first cemented lens is negative; The focal length of the second cemented lens is positive; The focal length of the third cemented lens is negative.

[0008] Furthermore, the endoscope has a dual-focus magnification function within the object distance range of 2-100mm, that is, it can switch between two different magnifications at the same object distance, namely the conventional configuration and the magnification configuration, and can achieve a high magnification configuration of 150 times at an object distance of 2mm.

[0009] Furthermore, the ultra-fine binocular zoom endoscope meets the following conditions: -0.9mm≤f 11 ≤-0.7mm -0.9mm≤f 121 ≤-0.7mm 1.7mm≤f 122 ≤1.8mm -2.9mm≤f 211 ≤-2.7mm 0.9mm≤f 212 ≤1.1mm 0.9mm≤f 221 ≤1.1mm -0.9mm≤f 222 ≤-0.8mm 35≤Vd 11 ≤43 49≤Vd 121 ≤57 43≤Vd 122 ≤50 22≤Vd211 ≤28 44≤Vd 212 ≤50 57≤Vd 221 ≤64 38≤Vd 222 ≤44 1.83≤Nd 11 ≤1.92 1.71≤Nd 121 ≤1.79 1.75≤Nd 122 ≤1.84 1.74≤Nd 211 ≤1.82 1.74≤Nd 212 ≤1.82 1.56≤Nd 221 ≤1.63 1.66≤Nd 222 ≤1.73 Among them, f 11 f is the effective focal length of the single lens; 121 f is the effective focal length of the object-side sub-lens in the first cemented lens; 122 f is the effective focal length of the image-side sub-lens in the first cemented lens; 211 f is the effective focal length of the object-side sub-lens in the second cemented lens; 212 f is the effective focal length of the image-side sub-lens in the second cemented lens; 221 f is the effective focal length of the object-side sub-lens in the third cemented lens; 222 Vd is the effective focal length of the image-side sub-lens in the third cemented lens. 11 Vd is the Abbe number of the single lens; 121 Vd is the Abbe number of the object-side sub-lens in the first cemented lens; 122 Vd is the Abbe number of the image-side sub-lens in the first cemented lens; 211 Vd is the Abbe number of the object-side sub-lens in the second cemented lens; 212 Vd is the Abbe number of the image-side sub-lens in the second cemented lens; 221 Vd is the Abbe number of the object-side sub-lens in the third cemented lens; 222 Nd is the Abbe number of the image-side sub-lens in the third cemented lens; 11 Nd is the refractive index of the single lens; 121 Nd is the refractive index of the object-side sub-lens in the first cemented lens; 122 Nd is the refractive index of the image-side sub-lens in the first cemented lens; 211Nd is the refractive index of the object-side sub-lens in the second cemented lens; 212 Nd is the refractive index of the image-side sub-lens in the second cemented lens; 221 Nd is the refractive index of the object-side sub-lens in the third cemented lens; 222 The refractive index of the image-side sub-lens in the third cemented lens; Furthermore, in the magnification configuration, the ultra-fine binocular zoom endoscope has a system focal length f. 放大 Meets 0.6mm <f 放大 <1.4mm, the ultra-fine binocular zoom endoscope, in its conventional configuration, has a system focal length f. 常规 Meets 0.4mm <f 常规 <0.8mm.

[0010] The ultra-fine binocular zoom endoscope, in a magnification configuration with an object distance of 100mm, satisfies the following condition: -0.9 <f1 / f 放大 <-0.5; 2.0 <f2 / f 放大 <2.5; The ultra-fine binocular zoom endoscope, in its standard configuration with an object distance of 100mm, satisfies the following condition: -1.8 <f1 / f 常规 <-1.1; 4.0 <f2 / f 常规 <5.2; The ultra-fine binocular zoom endoscope satisfies the following condition when configured at high magnification with an object distance of 2mm: -1.4 <f1 / f 高倍率 <-0.9; 3.4 <f2 / f 高倍率 <4.2; Where f1 is the focal length of the negative focal lens group, f2 is the focal length of the positive focal lens group, and f... 高倍率 The focal length is the system's focal length in the high magnification configuration with an object distance of 2mm.

[0011] Furthermore, the total optical length of the ultra-fine binocular zoom endoscope is less than 8.5 mm, and the positive focal lens group moves more than 1 mm along the optical axis between the negative focal lens group and the image sensor. This ensures multi-magnification continuous zoom while maintaining a miniaturized endoscope body, leaving sufficient performance margins for assembly errors, temperature drift, and long-term wear.

[0012] The specific technical advantages of this invention include: miniaturization and functional integration: It is compatible with binocular stereo imaging and 2-100mm continuous zoom within a lens diameter of no more than 4mm, with a maximum outer diameter of <1.5mm for a single lens, adapting to confined intracranial operating spaces; high-definition and stable imaging: Precise aberration correction is achieved through lens group combination design, with MTF ≥0.2@130lp / mm throughout the zoom range, axial spherical aberration ≤0.04mm, and astigmatism ≤0.06mm, avoiding image blur; and full-scene adaptability: It features bifocal magnification within a 2-100mm object distance, achieving 150x high magnification at a 2mm object distance when used with a 32-inch monitor, covering the full-scene needs of neurosurgery from "wide-angle positioning to medium-magnification observation to high-magnification fine operation." Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an ultra-fine binocular zoom endoscope according to the present invention; Figure 2 This is a schematic diagram of the structure in the magnified state at a 3mm object distance in Example 1; Figure 3 This is the MTF curve of Example 1 at a magnified state with an object distance of 3mm; Figure 4 The images show the spherical aberration, astigmatism, and distortion at a magnified state with an object distance of 3mm in Example 1. Figure 5 This is a schematic diagram of the structure in the normal state with an object distance of 3mm in Example 1; Figure 6 This is the MTF curve of Example 1 under normal conditions with an object distance of 3mm; Figure 7 The images show the spherical aberration, astigmatism, and distortion under normal conditions at a 3mm object distance in Example 1. Figure 8 This is a schematic diagram of the structure in the magnified state at an object distance of 100mm in Example 2; Figure 9 This is the MTF curve at a magnified state with an object distance of 100mm in Example 2; Figure 10 The images show the spherical aberration, astigmatism, and distortion at a magnified state with an object distance of 100mm in Example 2. Figure 11 This is a schematic diagram of the structure in the normal state with an object distance of 100mm in Example 2; Figure 12 This is the MTF curve of Example 2 under normal conditions with an object distance of 100mm; Figure 13 The images show the spherical aberration, astigmatism, and distortion under normal conditions at an object distance of 100 mm in Example 2. Figure 14 This is a schematic diagram of the structure at a distance of 2mm in Example 3; Figure 15 This is the MTF curve at a 2mm object distance in Example 3; Figure 16 The images show the spherical aberration, astigmatism, and distortion at a 2mm object distance in Example 3. Figure 17(a) shows the curves of the change in system focal length and field of view during the moving stroke of the positive focal lens group; Figure 17(b) shows the curves of magnification versus object distance during the moving stroke of the positive focal lens group; Figure 18 This is a schematic diagram of an ultra-fine binocular zoom endoscopic imaging system according to the present invention. Detailed Implementation

[0014] The unique zoom imaging effect and technical solution of the present invention are presented in detail below with reference to the accompanying drawings and embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, the present invention provides an ultra-fine binocular zoom endoscope, including a first optical path and a second optical path arranged side by side, which together constitute a dual-optical-path imaging system; each optical path has the same structure, and along the optical axis from the object side to the image side, it includes a negative focal lens group 1, a positive focal lens group 2 and an image sensor 3 in sequence; the negative focal lens group 1 is composed of a single lens 11 and a first cemented lens 12; the positive focal lens group 2 is composed of an aperture stop 21, a second cemented doublet lens 22 and a third cemented lens 23, and the aperture stop 21 is closely attached to the object side of the second cemented doublet lens 22. The first cemented lens 12 includes a biconcave lens 121 with negative optical power and a biconvex lens 122 with positive optical power; the second cemented lens 22 includes a meniscus lens 221 with negative optical power and a biconvex lens 222 with positive optical power; the third cemented lens 23 includes a biconvex lens 231 with positive optical power and a biconcave lens 232 with negative optical power; the moving stroke D of the positive focal lens group is the distance between the image side of the negative lens group and the object side of the positive lens group.

[0016] The focal length f1 of the negative focal lens group satisfies the condition: -1.0mm < f1 < -0.7mm; the single lens has negative optical power, and the first cemented lens has negative optical power; The focal length f2 of the positive focal lens group satisfies the condition: 1.5mm < f2 < 2.0mm; the second cemented lens has positive optical power, and the third cemented lens has negative optical power.

[0017] In some specific embodiments of the present invention, the effective focal length, Abbe number, and refractive index of each lens in the endoscope satisfy the following conditions: -0.9mm≤f 11≤-0.7mm -0.9mm≤f 121 ≤-0.7mm 1.7mm≤f 122 ≤1.8mm -2.9mm≤f 211 ≤-2.7mm 0.9mm≤f 212 ≤1.1mm 0.9mm≤f 221 ≤1.1mm -0.9mm≤f 222 ≤-0.8mm 35≤Vd 11 ≤43 49≤Vd 121 ≤57 43≤Vd 122 ≤50 22≤Vd 211 ≤28 44≤Vd 212 ≤50 57≤Vd 221 ≤64 38≤Vd 222 ≤44 1.83≤Nd 11 ≤1.92 1.71≤Nd 121 ≤1.79 1.75≤Nd 122 ≤1.84 1.74≤Nd 211 ≤1.82 1.74≤Nd 212 ≤1.82 1.56≤Nd 221 ≤1.63 1.66≤Nd 222 ≤1.73 Among them, f 11 f is the effective focal length of the single lens; 121 f is the effective focal length of the object-side sub-lens in the first cemented lens; 122 f is the effective focal length of the image-side sub-lens in the first cemented lens; 211 f is the effective focal length of the object-side sub-lens in the second cemented lens; 212 f is the effective focal length of the image-side sub-lens in the second cemented lens; 221 f is the effective focal length of the object-side sub-lens in the third cemented lens; 222Vd is the effective focal length of the image-side sub-lens in the third cemented lens. 11 Vd is the Abbe number of the single lens; 121 Vd is the Abbe number of the object-side sub-lens in the first cemented lens; 122 Vd is the Abbe number of the image-side sub-lens in the first cemented lens; 211 Vd is the Abbe number of the object-side sub-lens in the second cemented lens; 212 Vd is the Abbe number of the image-side sub-lens in the second cemented lens; 221 Vd is the Abbe number of the object-side sub-lens in the third cemented lens; 222 Nd is the Abbe number of the image-side sub-lens in the third cemented lens; 11 Nd is the refractive index of the single lens; 121 Nd is the refractive index of the object-side sub-lens in the first cemented lens; 122 Nd is the refractive index of the image-side sub-lens in the first cemented lens; 211 Nd is the refractive index of the object-side sub-lens in the second cemented lens; 212 Nd is the refractive index of the image-side sub-lens in the second cemented lens; 221 Nd is the refractive index of the object-side sub-lens in the third cemented lens; 222 The refractive index of the image-side sub-lens in the third cemented lens is given.

[0018] Based on the above, Table 1 shows some parameter values ​​of an ultra-fine binocular zoom endoscope in an embodiment, including object distance L, field of view W, magnification M (with a 32-inch display), effective focal length F, and the travel distance D of the positive focal lens group.

[0019] Table 1 As shown in Table 1, this invention provides an ultra-fine binocular zoom endoscope. The positive focal lens group moves between the negative focal lens group and the image sensor to achieve continuous optical zoom, with the magnification initially increasing and then decreasing. It possesses dual-focal magnification functionality within an object distance range of 3-100mm, meaning it offers two different magnifications for the same object distance. During the movement, a 150x magnification effect can be achieved at an object distance of 2mm. The following description, in conjunction with various embodiments, illustrates this: Example 1 The travel distance D of the positive focal lens group along the optical axis from the object side to the image side is changed from 0.4mm to 1.1mm, achieving bifocal magnification at an object distance of 3mm: The positive focusing lens group first reaches the magnification position of the ultra-fine binocular zoom endoscope, and the focal length f of the system is... 3mm放大 Meets 0.8mm <f 3mm放大 <1.1mm.

[0020] like Figures 2-4 In the magnified state, the system magnification is 125x, the MTF reaches 0.2@145p / mm at a 48° field of view, and it can achieve an object resolution of 0.028mm, axial spherical aberration of less than 0.03mm, astigmatism of less than 0.06mm, and distortion of less than 7%.

[0021] The positive focusing lens group continues to move to the normal position of the ultra-fine binocular zoom endoscope, and the focal length f of the system... 3mm常规 Meets 0.5mm <f 3mm常规 <0.8mm.

[0022] like Figures 5-7 Under normal conditions, the system magnification is 73x, the MTF reaches 0.2@170lp / mm at a 74° field of view, and it can achieve an object resolution of 0.040mm, axial spherical aberration of less than 0.03mm, astigmatism of less than 0.06mm, and distortion of less than 18%.

[0023] Example 2 The travel distance D of the positive focal lens group along the optical axis changes from 0mm to 1.3mm, achieving bifocal magnification at an object distance of 100mm: The positive focusing lens group first reaches the magnification position of the ultra-fine binocular zoom endoscope, and the focal length f of the system is... 100mm放大 Satisfies -0.9 <f1 / f 100mm放大 <-0.5, 2.0 <f2 / f 100mm放大 <2.5.

[0024] like Figures 8-10 In magnification mode, the system has a magnification of 5x, an MTF of 0.2@132p / mm at a 38° field of view, an axial spherical aberration of less than 0.04mm, an astigmatism of less than 0.06mm, and a distortion of less than 5%.

[0025] The positive focusing lens group continues to move to the normal position of the ultra-fine binocular zoom endoscope, and the focal length f of the system... 100mm常规 Satisfies -1.8 <f1 / f 100mm常规 <-1.1, 4.0 <f2 / f 100mm常规 <5.2.

[0026] like Figures 11-13 Under normal conditions, the system magnification is 2x, the MTF reaches 0.2@180lp / mm at an 87° field of view, the axial spherical aberration is less than 0.03mm, the astigmatism is less than 0.05mm, and the distortion is less than 27%.

[0027] Example 3 When the focal lens group moves along the optical axis by a distance D=0.7mm, it can achieve 150x magnification at an object distance of 2mm when used with a 32-inch monitor, meeting the needs of close-range fine operation.

[0028] The positive focusing lens group is moved to the high magnification position of the ultra-fine binocular zoom endoscope, and the focal length f of the system is... 2mm Satisfies -1.4 <f1 / f 高倍率 <-0.9, 3.4 <f2 / f 高倍率 <4.2.

[0029] like Figures 14-16 In magnification mode, the system has a magnification of 150x, an MTF of 0.2@165p / mm at a 68° field of view, and can achieve an object-side resolution of 0.020, axial spherical aberration of less than 0.03mm, astigmatism of less than 0.05mm, and distortion of less than 11%.

[0030] Figure 17(a) shows the field of view-effective focal length correspondence curve of the ultra-fine binocular zoom endoscope of the present invention. It reflects the dynamic correlation characteristics of the system's field of view and effective focal length when the movement stroke D of the positive focusing lens group changes within the range of 0 mm to 1.3 mm. As the stroke D increases from 0 mm to 1.3 mm, the field of view and effective focal length exhibit a synergistic adjustment relationship, which can ensure that the system maintains a clear field of view coverage and stable focal length parameters throughout the full zoom process, thereby achieving the wide field of view and continuously clear imaging required for surgical operations.

[0031] Figure 17(b) shows the object distance-magnification dual-focal curve of the ultra-fine binocular zoom endoscope of the present invention, corresponding to the change of the movement stroke D of the positive focal lens group within the range of 0 mm to 1.3 mm. This curve clarifies the matching relationship between object distance and magnification under different strokes, enabling the system to adapt to the imaging requirements of at least two magnifications under the same object distance condition, and meeting the multi-scenario switching of "lesion localization-fine operation" during surgery.

[0032] like Figure 18 As shown, the ultra-fine binocular zoom endoscope of this invention can be used in conjunction with a fiber optic illumination system, a control system, and a digital display system to form a complete endoscopic imaging system. Its workflow and extended applications are as follows: The control system outputs a control signal to the fiber optic illumination system, which then transmits white light to the illumination channel of the endoscope based on this signal, ensuring sufficient brightness in the surgical field. The light signal reflected from the tissue is transmitted to the digital display system via the optical path of the endoscope of this invention, achieving imaging of the surgical area. Based on the image field of view, magnification, and clarity presented by the digital display system, the control system can precisely adjust the movement of the endoscope's positive focusing lens group to adapt to the constraints of the narrow intracranial operating space, while restoring the spatial layer information of the tissue to meet the imaging accuracy requirements for lesion localization and fine operation; it can be connected to a feedback system to achieve automatic focusing, adaptive magnification, and wide-range brightness coverage through image feedback; it can be integrated into the surgical robot system as its binocular zoom vision module to provide stereoscopic, variable-magnification surgical area visual support for robot operation.

[0033] The embodiments described above are merely some preferred embodiments of the present invention, and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An ultra-fine binocular zoom endoscope, characterized in that, It includes a first optical path and a second optical path arranged side by side, which together constitute a dual-optical-path imaging system; each optical path has the same structure, including a negative focal lens group, a positive focal lens group and an image sensor arranged sequentially from the object side to the image side; The negative focal lens group consists of a single lens and a first cemented lens, and its focal length f1 satisfies the condition: -1.0mm < f1 < -0.7mm; The positive focusing lens group consists of an aperture stop, a second cemented lens, and a third cemented lens, and its focal length f2 satisfies the condition: 1.5mm < f2 < 2.0mm; the aperture stop is closely attached to the object side of the second cemented lens; The endoscope also includes an adjustment mechanism for synchronously driving the focal lens groups of the first and second optical paths to move along the optical axis, thereby achieving continuous and synchronous optical zoom and ensuring stereoscopic imaging effect.

2. The ultra-fine binocular zoom endoscope according to claim 1, characterized in that, All cemented lenses consist of object-side sub-lenses and image-side sub-lenses, arranged along the optical axis from the object side to the image side: The single lens is a plano-convex lens with negative optical power; In the first cemented lens, the object-side sub-lens is a biconcave lens with negative optical power, and the image-side sub-lens is a biconvex lens with positive optical power. In the second cemented lens, the object-side sub-lens is a meniscus lens with negative optical power, and the image-side sub-lens is a biconvex lens with positive optical power. The object-side sub-lens of the third cemented lens is a biconvex lens with positive optical power, and the image-side sub-lens is a biconcave lens with negative optical power.

3. The ultra-fine binocular zoom endoscope according to claim 2, characterized in that, The focal length of the single lens is negative; The focal length of the first cemented lens is negative; The focal length of the second cemented lens is positive; The focal length of the third cemented lens is negative.

4. The ultra-fine binocular zoom endoscope according to claim 2, characterized in that, The endoscope meets the following conditions: -0.9mm≤f 11 ≤-0.7mm; -0.9mm≤f 121 ≤-0.7mm; 1.7mm≤f 122 ≤1.8mm; -2.9mm≤f 211 ≤-2.7mm; 0.9mm≤f 212 ≤1.1mm; 0.9mm≤f 221 ≤1.1mm; -0.9mm≤f 222 ≤-0.8mm; 35≤Vd 11 ≤43; 49≤Vd 121 ≤57; 43≤Vd 122 ≤50; 22≤Vd 211 ≤28; 44≤Vd 212 ≤50; 57≤Vd 221 ≤64; 38≤Vd 222 ≤44; 1.83≤Nd 11 ≤1.92; 1.71≤Nd 121 ≤1.79; 1.75≤Nd 122 ≤1.84; 1.74≤Nd 211 ≤1.82; 1.74≤Nd 212 ≤1.82; 1.56≤Nd 221 ≤1.63; 1.66≤Nd 222 ≤1.73; Among them, f 11 f is the effective focal length of the single lens; 121 f is the effective focal length of the object-side sub-lens in the first cemented lens; 122 f is the effective focal length of the image-side sub-lens in the first cemented lens; 211 f is the effective focal length of the object-side sub-lens in the second cemented lens; 212 f is the effective focal length of the image-side sub-lens in the second cemented lens; 221 f is the effective focal length of the object-side sub-lens in the third cemented lens; 222 Vd is the effective focal length of the image-side sub-lens in the third cemented lens. 11 Vd is the Abbe number of the single lens; 121 Vd is the Abbe number of the object-side sub-lens in the first cemented lens; 122 Vd is the Abbe number of the image-side sub-lens in the first cemented lens; 211 Vd is the Abbe number of the object-side sub-lens in the second cemented lens; 212 Vd is the Abbe number of the image-side sub-lens in the second cemented lens; 221 Vd is the Abbe number of the object-side sub-lens in the third cemented lens; 222 Nd is the Abbe number of the image-side sub-lens in the third cemented lens; 11 Nd is the refractive index of the single lens; 121 Nd is the refractive index of the object-side sub-lens in the first cemented lens; 122 Nd is the refractive index of the image-side sub-lens in the first cemented lens; 211 Nd is the refractive index of the object-side sub-lens in the second cemented lens; 212 Nd is the refractive index of the image-side sub-lens in the second cemented lens; 221 Nd is the refractive index of the object-side sub-lens in the third cemented lens; 222 The refractive index of the image-side sub-lens in the third cemented lens is given.

5. The ultra-fine binocular zoom endoscope according to claim 1, characterized in that, It features dual-focus magnification within a 2-100mm object distance range, meaning it can switch between two different magnifications at the same object distance: a standard configuration and a magnified configuration. At a 2mm object distance, it can achieve a high magnification of 150x.

6. The ultra-fine binocular zoom endoscope according to claim 4, characterized in that, When the ultra-fine binocular zoom endoscope is in magnification configuration, the system focal length f 放大 Meets 0.6mm <f 放大 <1.4mm, the ultra-fine binocular zoom endoscope, in its conventional configuration, has a system focal length f. 常规 Meets 0.4mm <f 常规 <0.8mm.

7. The ultra-fine binocular zoom endoscope according to claim 4, characterized in that, The ultra-fine binocular zoom endoscope, in a magnification configuration with an object distance of 100mm, satisfies the following condition: -0.9<f1 / f 放大 <-0.5; 2.0<f2 / f 放大 <2.5; The ultra-fine binocular zoom endoscope, in its standard configuration with an object distance of 100mm, satisfies the following condition: -1.8<f1 / f 常规 <-1.1; 4.0<f2 / f 常规 <5.2; The ultra-fine binocular zoom endoscope satisfies the following condition when configured at high magnification with an object distance of 2mm: -1.4<f1 / f 高倍率 <-0.9; 3.4<f2 / f 高倍率 <4.2; Where f1 is the focal length of the negative focal lens group, f2 is the focal length of the positive focal lens group, and f... 高倍率 The focal length is the system's focal length in the high magnification configuration with an object distance of 2mm.

8. The ultra-fine binocular zoom endoscope according to claim 1, characterized in that, The positive focal lens group has a travel distance of >1mm between the negative focal lens group and the image sensor, and this travel distance covers a clear imaging range of 2-100mm object distance.

9. The ultra-fine binocular zoom endoscope according to claim 1, characterized in that, The endoscope has a maximum diameter of no more than 4 mm, and the maximum outer diameter of a single lens in the negative focal lens group and positive focal lens group is less than 1.5 mm. When used with a 32-inch monitor, it can achieve a magnification of up to 150 times.

10. An ultra-fine binocular zoom endoscope system, characterized in that, include: An ultra-fine binocular zoom endoscope, which is provided with an illumination channel and an optical path, wherein the optical path adopts the dual-optical-path imaging system in the endoscope as described in any one of claims 1-9; The control system adjusts the movement stroke of the focal lens group of the dual-optical-path imaging system according to the image field of view, magnification, and sharpness to adapt to narrow spaces and restore tissue layers; The lighting system receives signals from the control system and provides lighting through the lighting channel; The digital display system receives the light signals transmitted through the optical path and performs imaging.

Images