A rotating mirror structure of a 4K ultra-high-definition laparoscope

Abstract

The present invention relates to a rotating mirror structure of a 4K ultra-high-definition laparoscope, and its innovation lies in: it is composed of two groups of completely symmetrical three-glued mirror groups, and the two groups of three-glued mirror groups are sequentially glued into one body along the direction of light, each group of three-glued mirror groups includes a first lens, a second lens and a third lens, one side surface of the first lens is an even-order aspheric structure, and the other side surface is a concave surface, both side surfaces of the second lens are convex surfaces, one side surface of the third lens is a concave surface, and the other side surface is an even-order aspheric structure, the concave surface of the first lens is opposite to the convex surface of one side of the second lens and glued into one body, and the other side convex surface of the second lens is opposite to the concave surface of the third lens and glued into one body. In order to achieve a numerical aperture of 0.12, the present invention achieves a balance of aberrations when it is increased by 50% compared with FHD, so that it can meet the 4K resolution.

Description

Technical Field

[0001] The present invention relates to a rotating mirror structure, in particular to a rotating mirror structure of a 4K ultra-high definition laparoscope, and belongs to the technical field of laparoscopes in medical devices. Background Art

[0002] The rigid tube laparoscope consists of three parts: objective lens, relay lens and eyepiece. Working principle: The lesion surface is illuminated by the light introduced by the optical fiber bundle, and the objective lens images the lesion surface to the rear focal plane of the objective lens. The image of the rear focal plane of the objective lens is transmitted to the vicinity of the front focal plane of the eyepiece by three or five groups of relay systems with a magnification of -1. The light beam emitted from the exit pupil of the eyepiece is close to parallel light. The human eye can observe directly at the exit pupil of the eyepiece, or use an adapter to form the image onto the focal plane detector, which can be CCD or CMOS.

[0003] Among them, the image-shifting mirror plays an important role in the rigid tube laparoscope. Due to the large number of them, it is an important component of the cost of the endoscope. In order to reduce costs, the image-shifting mirror is generally designed as three groups of completely identical, each group of completely symmetrical mirrors. The advantage of this design is that the cost is low, which can effectively reduce the price of the endoscope to a reasonable range. The disadvantage is that the three groups of completely symmetrical image-shifting mirrors will cause the axial phase difference to accumulate continuously, forming a large residual field curvature, which will cause difficulties in balancing the phase difference of the entire endoscope, especially when designing a 4K ultra-high-definition resolution laparoscope. Such a disadvantage becomes unbearable. The resolution of 4K UHD laparoscope is doubled compared to FHD, and the NA (numerical aperture: a key parameter that determines the ultimate resolution of the optical system. The larger the value, the higher the ultimate resolution that can be achieved) value is expected to reach 0.12. Obviously, the existing structural form is not enough to support the transmission of the intermediate image of the new higher-resolution rigid tube laparoscope. Summary of the invention

[0004] The purpose of the present invention is to provide a rotating mirror structure for a 4K ultra-high-definition laparoscope that achieves a numerical aperture of 0.12, which is 50% larger than FHD, while achieving a balance of aberrations so that it can meet the 4K resolution.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a 4K ultra-high-definition laparoscope image-transmitting mirror structure, the innovation of which is that it is composed of two groups of completely symmetrical three-glued mirror groups, and the two groups of three-glued mirror groups are sequentially glued into one along the direction of light, and each group of three-glued mirror groups includes a first lens, a second lens and a third lens,

[0006] One side surface of the first lens is an even aspheric structure, and the other side surface is a concave surface. Both side surfaces of the second lens are convex surfaces. One side surface of the third lens is a concave surface, and the other side surface is an even aspheric structure.

[0007] The concave surface of the first lens is opposite to the convex surface of one side of the second lens and is glued together as one body, and the other convex surface of the second lens is opposite to the concave surface of the third lens and is glued together as one body.

[0008] In the above technical solution, the refractive index of the first lens is 1.67, the refractive index of the second lens is 1.62, and the refractive index of the third lens is 1.89.

[0009] In the above technical solution, the first lens, the second lens and the third lens are glued together by ultraviolet photosensitive glue.

[0010] In the above technical solution, the glass material of the second lens is one of F2 (CDGM), F4 (CDGM), F2 (HOYA), PBM2 (OHARA), F5 (SCHOTT), F1 (CDGM), F5 (HOYA), and PBM5 (OHARA).

[0011] In the above technical solution, the even-order aspheric surface structural parameters of the first lens are:

[0012] -1.0E-6>a 2 >=-1.0E-4

[0013] -2.0E-7>a 3 >-2.0E-8

[0014] 25>R>10

[0015] Among them, a 2 is the 4th order coefficient of the even aspheric surface, a 3 is the 6th order coefficient of the even aspheric surface, and R is the radius of curvature.

[0016] In the above technical solution, the aspheric surface structural parameters of the third lens are:

[0017] 1.0E-3>a 21 >=1.0E-4

[0018] -2.0E-5>a 31 >-2.0E-4

[0019] 30>R1>15

[0020] Among them, a 2 is the 4th order coefficient of the even aspheric surface, a 3 is the 6th order coefficient of the even aspheric surface, and R1 is the radius of curvature.

[0021] The positive effects of the present invention are as follows: after adopting the image-transmitting mirror structure of the 4K ultra-high-definition laparoscope of the present invention, since the present invention is composed of two groups of completely symmetrical three-glued mirror groups, and the two groups of three-glued mirror groups are sequentially glued together along the direction of light, each group of three-glued mirror groups includes a first lens, a second lens and a third lens, one side surface of the first lens is an even-order aspheric structure, and the other side surface is a concave surface, both side surfaces of the second lens are convex surfaces, one side surface of the third lens is a concave surface, and the other side surface is an even-order aspheric structure, the concave surface of the first lens is opposite to the convex surface of one side of the second lens and glued together, and the other side convex surface of the second lens is opposite to the concave surface of the third lens and glued together;

[0022] Since one side surface (front surface) of the first lens and the other side surface (rear surface) of the third lens in the image-transmitting mirror structure of the present invention both adopt an even-order aspherical design, aberration balance is achieved when the NA (numerical aperture) reaches 0.12, which is 50% higher than that of FHD (full ultra high definition). At the same time, the second lens has good transmittance in the visible light band and excellent colorability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of a rotating mirror structure of a 4K ultra-high-definition laparoscope according to the present invention;

[0024] Figure 2 This is a comparison chart of the transmittance curves of three groups of rod mirrors made of different glass materials. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to the accompanying drawings and given embodiments, but is not limited thereto.

[0026] like Figure 1 As shown, a 4K ultra-high-definition laparoscope image-transmitting mirror structure is composed of two groups of completely symmetrical three-cemented mirror groups, and the two groups of three-cemented mirror groups are sequentially glued together along the direction of light, and each group of three-cemented mirror groups includes a first lens 1, a second lens 2 and a third lens 3.

[0027] One side surface of the first lens 1 is an even aspheric structure, and the other side surface is a concave surface. Both side surfaces of the second lens 2 are convex surfaces. One side surface of the third lens 3 is a concave surface, and the other side surface is an even aspheric structure.

[0028] The concave surface of the first lens 1 is opposite to the convex surface of one side of the second lens 2 and glued together as one body, and the other convex surface of the second lens 2 is opposite to the concave surface of the third lens 3 and glued together as one body.

[0029] Furthermore, the first lens 1, the second lens 2 and the third lens 3 of the present invention are bonded together by ultraviolet photosensitive adhesive. The ultraviolet photosensitive adhesive is high temperature resistant ultraviolet photosensitive adhesive, and the high temperature resistance temperature is 125° C. to 135° C. The advantage of such a design is that it can not only balance the chromatic aberration, but also ensure that the optical system can not undergo structural changes during high temperature steam sterilization.

[0030] The even-order aspheric surface structural parameters of the first lens 1 of the present invention are:

[0031] -1.0E-6>a 2 >=-1.0E-4

[0032] -2.0E-7>a 3 >-2.0E-8

[0033] 25>R>10

[0034] Among them, a 2 is the 4th order coefficient of the even aspheric surface, a 3 is the sixth-order coefficient of the even aspheric surface, and R is the radius of curvature. The refractive index of the first lens 1 is 1.67.

[0035] The glass material of the second lens 2 is one of F2 (CDGM), F4 (CDGM), F2 (HOYA), PBM2 (OHARA), F5 (SCHOTT), F1 (CDGM), F5 (HOYA), PBM5 (OHARA), and the refractive index of the second lens 2 is 1.62.

[0036] The relay mirror is the longest part of the laparoscope. Glass is an excellent medium for light transmission, and its absorption rate is usually negligible. However, for an endoscope, the image transmission system consists of 6 identical rod mirrors, and the total glass thickness will reach 270mm. The problem with glass with higher transmittance is that the refractive index is low and the transmission capacity of optical information is insufficient. High refractive index glass often has insufficient transmittance in the blue light part, resulting in insufficient color reproduction ability of the entire optical system.

[0037] like Figure 2 Shown is the transmittance curve of glass N-BAF10 and F2 (CDGM) with a refractive index of 1.67 when the glass thickness is 270 mm. Figure 2 The horizontal axis is wavelength (in um), and the vertical axis is transmittance. It can be seen from the figure that the glass selected by the present invention can have consistent optical transmittance in the entire visible light band while meeting high-resolution imaging, and the transmittance in the visible light band is maintained at more than 90%, which is difficult to achieve with other glasses.

[0038] Furthermore, the aspheric surface structural parameters of the third lens 3 are:

[0039] 1.0E-3>a 21 >=1.0E-4

[0040] -2.0E-5>a 31 >-2.0E-4

[0041] 30>R1>15

[0042] Among them, a 2 is the 4th order coefficient of the even aspheric surface, a 3 is the 6th order coefficient of the even aspheric surface, R1 is the radius of curvature, and the refractive index of the third lens 3 is 1.89.

[0043] An example of a specific implementation is provided in Table 1 below:

[0044] Table 1

[0045]

[0046] Since one side surface (front surface) of the first lens and the other side surface (rear surface) of the third lens in the image-transmitting mirror structure of the present invention both adopt an even-order aspherical design, aberration balance is achieved when the NA (numerical aperture) reaches 0.12, which is 50% higher than that of FHD (full ultra high definition). At the same time, the second lens has good transmittance in the visible light band and excellent colorability.

[0047] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A 4K ultra-high definition laparoscope rotating mirror structure, characterized in that: The lens is composed of two groups of completely symmetrical three-cemented lens groups, and the two groups of three-cemented lens groups are sequentially cemented into one along the direction of light, and each group of three-cemented lens groups includes a first lens (1), a second lens (2) and a third lens (3). One side surface of the first lens (1) is an even-order aspheric surface, and the other side surface is a concave surface; both side surfaces of the second lens (2) are convex surfaces; one side surface of the third lens (3) is a concave surface, and the other side surface is an even-order aspheric surface; The concave surface of the first lens (1) is opposite to the convex surface of one side of the second lens (2) and is glued together as a whole; the other convex surface of the second lens (2) is opposite to the concave surface of the third lens (3) and is glued together as a whole; the refractive index of the second lens (2) is 1.

62. The even-order aspheric surface structural parameters of the first lens (1) are: -1.0E-6>a2>=-1.0E-4 -2.0E-7>a3>-2.0E-8 25＞R＞10 Wherein, a2 is the 4th order coefficient of the even aspheric surface, a3 is the 6th order coefficient of the even aspheric surface, R is the radius of curvature, and the aspheric surface structural parameters of the third lens (3) are: 1.0E-3>a 21 >=1.0E-4 -2.0E-5>a 31 >-2.0E-4 30＞R1＞15 Among them, a2 is the 4th order coefficient of the even aspheric surface, a3 is the 6th order coefficient of the even aspheric surface, and R1 is the radius of curvature.

2. The rotating mirror structure of the 4K ultra-high definition laparoscope according to claim 1, characterized in that: The refractive index of the first lens (1) is 1.67, and the refractive index of the third lens (3) is 1.

89.

3. The rotating mirror structure of the 4K ultra-high definition laparoscope according to claim 1, characterized in that: The first lens (1), the second lens (2) and the third lens (3) are bonded together by ultraviolet photosensitive adhesive.

4. The rotating mirror structure of the 4K ultra-high definition laparoscope according to claim 1, characterized in that: The glass material of the second lens (2) is one of F2 (CDGM), F4 (CDGM), F2 (HOYA), PBM2 (OHARA), F5 (SCHOTT), F1 (CDGM), F5 (HOYA), and PBM5 (OHARA).

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