CN208847937U - 4K Laparoscopic Imaging Objectives - Google Patents

Abstract

The utility model discloses a kind of abdominal cavity endoscope objective lens for having 4K ultra high-definition imaging function, which is successively made of protection windowpane, negative group balsaming lens, positive group balsaming lens from object side to image side, wherein just group balsaming lens group shares 3 groups.Above-mentioned objective lens arrangement realizes the imaging function of achromatism, short focus, long reach.The abdominal cavity endoscope objective lens of the utility model have the advantage that compact-sized, the piece number is few, high resolution, visual field are big, distortion is small.

Description

4K laparoscope image-forming objective lens

Technical field

The utility model relates to a kind of abdominal cavity endoscope objective lens more particularly to a kind of laparoscopes for having 4K ultra high-definition imaging function Object lens.

Background technique

Laparoscopically surgical operation is a big mainstream of modern medicine development, light, the painful small, post-operative recovery of patient with wound Many advantages, such as fast；Post-operative hospital stay can significantly be shortened simultaneously, reduce the consumption of medical resource.Optical imagery is that laparoscope is set The part of standby most critical, the operation of doctor are completely dependent on the image of laparoscope acquisition, and the clarity of image is directly related in art Judgement to disease, the identification to institutional frameworks such as blood vessel bile ducts, and operation accuracy and accuracy, generally optics at As closely related with the safety of operation.Therefore, the Main Trends of The Development of laparoscopic technique is exactly continuous raising optical imagery Quality.Optical imagery develops from 1080p high definition to 4K ultra high-definition at present, and 4K laparoscopic image resolution ratio reaches 3840 × 2160, it is 4 times of 1080p high-definition image, clearer organ and textual details is provided, improves the positioning accuracy of lesion, opponent The raising of art quality and safety has great role.

Laparoscope objective lens optical system is the critical component of laparoscope, should guarantee high-resolution, again while realize big view Rink corner and small distortion imaging, this is very challenging in optical design.Big field angle is bright for expanding doctor visual field effect Aobvious, small distortion further improves the accuracy of intracorporeal organ and tissue size and position.

Utility model content

The purpose of the utility model is to provide a kind of abdominal cavity endoscope objective lens for having the imaging of 4K ultrahigh resolution, the objective lens arrangements It is compact, the piece number is few, visual field is big, distortion is small, can be realized in 1/2 " imaging sensor specification 4K or so ultra high-definition imaging.

A kind of abdominal cavity endoscope objective lens having the imaging of 4K ultra high-definition of the utility model, including lens barrel, from object space in lens barrel The first balsaming lens, the first spacer ring, the second balsaming lens, third balsaming lens, the second spacer ring and are successively fitted with to image space Four balsaming lens can be equipped with protection windowpane in the object space of the first balsaming lens；Wherein from the object side to the image side, windowpane is protected Two faces be plane；First balsaming lens include the first negative lens and the first positive lens, the first negative lens its towards object space It is concave surface towards image space for convex surface, it is convex surface towards image space that it towards object space is plane to the first positive lens；Second balsaming lens Including the second positive lens and the second negative lens, the second face of positive lens two is convex surface, and the second face of negative lens two is concave surface； Third balsaming lens includes third negative lens and third positive lens, and two faces of third negative lens are concave surface, third positive lens two A face is convex surface；4th balsaming lens include the 4th negative lens and the 4th positive lens, the 4th negative lens its towards object space be it is convex Face is concave surface towards image space, and the 4th face of positive lens two is convex surface.

The protection windowpane use sapphire material, object space plan radius of curvature be it is infinite, mirror surface distance is 0.80mm, mirror surface radius 2.6510mm, image space plane radius of curvature be it is infinite, mirror surface distance be 0.20mm, mirror surface radius 2.3471mm lens radius 3.0mm；

First negative lens uses H-ZLAF55D glass material, convex radius 33.75mm, mirror surface distance 0.60mm, mirror surface radius 2.1308mm, the concave curvature radius of the first negative lens are 2.81mm, and mirror surface distance is 0.75mm, mirror Radius surface is 1.6887mm, lens radius 2.4mm；

First positive lens equally uses H-ZLAF55D glass material, and plan radius of curvature is infinite, mirror surface distance 11.20mm, mirror surface radius 1.6632mm, the convex radius of the first positive lens are -5.24mm, and mirror surface distance is 1.06mm, Mirror surface radius is 0.8212mm, lens radius 2.75mm；

The lens radius 2.4mm of first negative lens is greater than its concave mirror radius surface 1.6887mm, is formed in concave surface endface The plane of plane, this plane and the first positive lens is glued；

Second positive lens uses H-ZF1 glass material, and object space convex radius is 3.14mm, and mirror surface distance is 1.95mm, mirror surface radius are 1.0793mm, and image space convex radius is -3.14mm, and the object space concave surface with the second negative lens It is glued；The lens radius of second positive lens is 2.0mm；

Second negative lens uses H-ZF72A glass material, and object space concave curvature radius is -3.14mm, and mirror surface distance is 1.06mm, mirror surface radius are 1.0522mm, and the image space concave curvature radius of the second negative lens is 3.14mm, and mirror surface distance is 0.30mm, mirror surface radius are 1.2213mm, and the lens radius of the second negative lens is 2.4mm；

Third negative lens uses H-ZF52 glass material, and object space concave curvature radius is -12.53mm, and mirror surface distance is 0.60mm, mirror surface radius are 1.1069mm, and the radius of curvature of image space concave surface is 7.01mm, and convex with the object space of third positive lens Face is glued；

Third positive lens uses H-ZPK5 glass material, and object space convex radius is 7.01mm, mirror surface distance 1.65mm, mirror surface radius are 1.2968mm, and image space convex radius is -4.302mm, mirror surface distance 0.15mm, mirror surface half Diameter is 1.6859mm, and the lens radius of third negative lens and third positive lens is 2.4mm；

4th negative lens uses H-LAF4 glass material, and object space convex radius is 10.8mm, and mirror surface distance is 0.67mm, mirror surface radius are 1.8649mm, and the radius of curvature of image space concave surface is 3.04mm, and convex with the object space of the 4th positive lens Face is glued；

4th positive lens uses H-ZPK5 glass material, and object space convex radius is 3.04mm, mirror surface distance 2.11mm, mirror surface radius are 1.9524mm, and image space convex radius is -9.03mm, mirror surface distance 2.49mm, mirror surface radius For 2.0040mm, the lens radius of the 4th negative lens and the 4th positive lens is 2.4mm.

Under normal circumstances, the real image face of abdominal cavity endoscope objective lens rear end is transmitted in vitro by relay optical system, relay optical System is usually 3-5 grades, and every grade of imaging magnification is 1 times.Therefore, the imaging performance of object lens determines entire laparoscope optics The imaging performance of system.Relay optical system rear end can be shown on a monitor directly by CMOS or ccd image sensor at real image Show in-vivo image, can also be observed by eyes by eyepiece at the virtual image or image is acquired by camera system.

For terminating 1/2 " CMOS or ccd image sensor after relay optical system (such as OS08A10), image planes size For 7.7mm × 4.4mm, 2 μm of Pixel Dimensions, spatial-cut-off frequency 250lp/mm.The abdominal cavity endoscope objective lens of the utility model are in 0.5 view Its modulation degree is not much different with diffraction limit (DIFFRACTION LIMIT) in the range of field, when modulation degree is 0.26,0.5 Spatial frequency values in field range reach 185lp/mm or so, reach 2849 in the pixel resolution of CMOS photosurface × 1628, close to the resolution ratio 3840 × 2160 of 4K, better than the 1920 × 1080 of 1080p, and imaging viewing field angle reaches 90 degree, distortion Rate is about 12%.Therefore with high resolution, the imaging advantages that visual field is big, distortion is small.

Detailed description of the invention

Fig. 1 is the general structure schematic diagram of the utility model.

Fig. 2 be the utility model in the case where designing object distance (35mm object distance) optical transfer function.

Fig. 3 be the utility model in the case where designing object distance (35mm object distance) distortion curve.

Specific embodiment

The following is further explained with reference to the attached drawings the utility model.

Shown in Fig. 1, a kind of abdominal cavity endoscope objective lens having 4K ultra high-definition imaging function disclosed by the utility model, including lens barrel (6), it is successively fitted with the first balsaming lens (2), the first spacer ring (7), the second balsaming lens from the object side to the image side in lens barrel (6) (3), third balsaming lens (4), the second spacer ring (8) and the 4th balsaming lens (5) can be filled in the object space of the first balsaming lens (2) Equipped with protection windowpane (1)；Wherein from the object side to the image side, two faces for protecting windowpane (1) are plane；First balsaming lens (2) include the first negative lens (21) and the first positive lens (22), the first negative lens (21) its towards object space be convex surface, towards image space For concave surface, it is convex surface towards image space that it towards object space is plane to the first positive lens (22)；Second balsaming lens (3) includes second Positive lens (31) and the second negative lens (32), the second positive lens (31) its towards object space and image space be convex surface, the second negative lens (32) two faces are concave surface；Third balsaming lens (4) includes third negative lens (41) and third positive lens (42), and third is negative saturating (41) two faces of mirror are concave surface, and (42) two faces of third positive lens are convex surface；4th balsaming lens (5) includes the 4th negative Mirror (51) and the 4th positive lens (52), the 4th negative lens (51) its towards object space be convex surface, towards image space be concave surface, the 4th just thoroughly (52) two faces of mirror are convex surface.Protection windowpane (1) need not be assemblied in lens barrel (6), but be set according to the entirety of laparoscope Meter, is assemblied in the scope tube head end of laparoscope as needed, using sapphire glass material, plays sealing and antiwear function Energy.

A total of 15 mirror surfaces of laparoscope object lens in this example, from the object side to the image side successively is defined as: protection windowpane 1 Object space plane is the 1st mirror surface, and the image space plane of protection windowpane 1 is the 2nd mirror surface, and the object space convex surface of the first negative lens 21 is the 3rd Mirror surface, the image space concave surface of the first negative lens 21 are the 4th mirror surface, and the object space plane of the first positive lens 22 is the 5th mirror surface, and first just thoroughly The image space convex surface of mirror 22 is the 6th mirror surface, and the object space convex surface of the second positive lens 31 is the 7th mirror surface, the second positive lens 31 and second negative The cemented surface of lens 32 is the 8th mirror surface, and the image space concave surface of the second negative lens 32 is the 9th mirror surface, and the object space of third negative lens 41 is recessed Face is the 10th mirror surface, and the cemented surface of third negative lens 41 and third positive lens 42 is the 11st mirror surface, the image space of third positive lens 42 Convex surface is the 12nd mirror surface, and the object space convex surface of the 4th negative lens 51 is the 13rd mirror surface, the 4th negative lens 51 and the 4th positive lens 52 Cemented surface is the 14th mirror surface, and the image space convex surface of the 4th positive lens 52 is the 15th mirror surface.The structural parameters of 15 mirror surfaces are shown in Table 1:

Table 1

When being applied to laparoscope imaging, the object lens real image face of the utility model is transmitted to body by relay optical system Outside, relay optical system is usually 3-5 grades, and every grade of imaging magnification is 1 times.Therefore, the imaging performance of object lens determines whole The imaging performance of a laparoscope optical system.Relay optical system rear end can directly by CMOS or ccd image sensor at real image, In-vivo image is shown on a monitor, can also be observed by eyes by eyepiece at the virtual image or image is acquired by camera system.

Fig. 2 and Fig. 3 illustrates the optical imagery performance of the utility model.

The not high 0mm of jljl (AXIS), the high 7mm of object (0.25FIELD), object high 15mm when Fig. 2 calculates 35mm object distance The optical transfer function of (0.5FIELD), the high 25mm of object (0.8FIELD) and the high 35mm of object (1.0FIELD, 45 °) five visual fields Value.From Figure 2 it can be seen that the utility model modulation degree be 0.26 when, the spatial frequency values of all visual fields can reach 150lp/mm with On.When wherein the modulation degree of the high 15mm of object (0.5FIELD) is 0.26, corresponding spatial frequency values are 185lp/mm.To relay light System Back-end is learned to connect for 1/2 " CMOS or ccd image sensor (such as OS08A10), image planes having a size of 7.7mm × 4.4mm, 2 μm of Pixel Dimensions, spatial-cut-off frequency 250lp/mm (better than the spatial frequency of the utility model objective lens optical system).Its The pixel resolution of CMOS photosurface reaches 2849 × 1628, the resolution close to the resolution ratio 3840 × 2160 of 4K, better than 1080p Rate 1920 × 1080.

Fig. 3 shows the object lens of the utility model under 35mm object distance, and when the target imaging of 35mm high to object, aberration rate is about It is 12%, shows that its imaging viewing field can reach 90 °.Therefore the utility model has the imaging that high resolution, visual field are big, distortion is small Advantage.

Claims (2)

1. A 4K laparoscopic imaging objective lens is characterized in that: comprising a lens barrel (6), in the lens barrel (6) from the object side to the image side, the first cemented lens (2), the first spacer (2) are sequentially installed. 7), the second cemented lens (3), the third cemented lens (4), the second spacer (8) and the fourth cemented lens (5), the first cemented lens (2) can be equipped with protection Glass window (1); wherein from the object side to the image side, both surfaces of the protective glass window (1) are planes; the first cemented lens (2) comprises a first negative lens (21) and a first positive lens (22) ), the first negative lens (21) is a convex surface facing the object, a concave surface facing the image, the first positive lens (22) is a plane facing the object, and a convex surface facing the image; the second cemented lens (3) includes A second positive lens (31) and a second negative lens (32), both surfaces of the second positive lens (31) are convex, and both surfaces of the second negative lens (32) are concave; the third cemented lens (4) ) comprises a third negative lens (41) and a third positive lens (42), both surfaces of the third negative lens (41) are concave, and both surfaces of the third positive lens (42) are convex; the fourth cemented lens (5) comprising a fourth negative lens (51) and a fourth positive lens (52), the fourth negative lens (51) has a convex surface facing the object and a concave surface facing the image, and the fourth positive lens (52) has two surfaces All are convex. 2. 4K laparoscopic imaging objective lens according to claim 1, is characterized in that: The protective glass window (1) is made of SAPPHIRE (sapphire) material, the object plane curvature radius is infinite, the mirror surface distance is 0.80mm, the mirror surface radius is 2.6510mm, the image plane curvature radius is infinite, the mirror surface distance is 0.20mm, the mirror surface The radius is 2.3471mm, and the lens radius is 3.0mm; The first negative lens (21) is made of H-ZLAF55D glass material, the object-side convex curvature radius is 33.75mm, the mirror distance is 0.60mm, the mirror radius is 2.1308mm, and the image-side concave curvature radius of the first negative lens (21) is 2.81mm , the mirror distance is 0.75mm, the mirror radius is 1.6887mm, and the lens radius is 2.4mm; The first positive lens (22) is also made of H-ZLAF55D glass material, its plane curvature radius is infinite, the mirror surface distance is 11.20mm, the mirror surface radius is 1.6632mm, the convex surface curvature radius of the first positive lens (22) is -5.24mm, and the mirror surface distance is -5.24mm. is 1.06mm, the mirror radius is 0.8212mm, and the lens radius is 2.75mm; The lens radius 2.4mm of the first negative lens (21) is greater than the concave mirror surface radius 1.6887mm, and a plane is formed at the concave end face, and this plane is cemented with the plane of the first positive lens (22); The second positive lens (31) is made of H-ZF1 glass material, the object-side convex curvature radius is 3.14mm, the mirror distance is 1.95mm, the mirror surface radius is 1.0793mm, the image-side convex curvature radius is -3.14mm, and the second positive lens (31) is The object-side concave surfaces of the negative lens (32) are cemented; the lens radius of the second positive lens (31) is 2.0 mm; The second negative lens (32) is made of H-ZF72A glass material, the object-side concave curvature radius is -3.14mm, the mirror distance is 1.06mm, and the mirror radius is 1.0522mm. The image-side concave curvature radius of the second negative lens (32) is 3.14mm, the mirror distance is 0.30mm, the mirror radius is 1.2213mm, and the lens radius of the second negative lens (32) is 2.4mm; The third negative lens (41) is made of H-ZF52 glass material, its object-side concave surface curvature radius is -12.53mm, its mirror surface distance is 0.60mm, its mirror surface radius is 1.1069mm, its image-side concave surface curvature radius is 7.01mm, and The object-side convex surface of the third positive lens (42) is cemented; The third positive lens (42) is made of H-ZPK5 glass material, the object-side convex curvature radius is 7.01mm, the mirror surface distance is 1.65mm, the mirror surface radius is 1.2968mm, the image-side convex surface curvature radius is -4.302mm, and the mirror surface distance is 0.15mm , the mirror surface radius is 1.6859mm, and the lens radius of the third negative lens (41) and the third positive lens (42) are both 2.4mm; The fourth negative lens (51) is made of H-LAF4 glass material, its object-side convex surface curvature radius is 10.8mm, its mirror surface distance is 0.67mm, its mirror surface radius is 1.8649mm, its image-side concave surface curvature radius is 3.04mm, and the The object-side convex surfaces of the four positive lenses (52) are cemented; The fourth positive lens (52) is made of H-ZPK5 glass material, its object-side convex surface curvature radius is 3.04mm, its mirror surface distance is 2.11mm, its mirror surface radius is 1.9524mm, its image-side convex surface curvature radius is -9.03mm, and its mirror surface distance is 2.49mm , the mirror surface radius is 2.0040mm, and the lens radius of the fourth negative lens (51) and the fourth positive lens (52) are both 2.4mm.