CN107561678B - Operation microscope camera optical system - Google Patents
Operation microscope camera optical system Download PDFInfo
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- CN107561678B CN107561678B CN201710741303.2A CN201710741303A CN107561678B CN 107561678 B CN107561678 B CN 107561678B CN 201710741303 A CN201710741303 A CN 201710741303A CN 107561678 B CN107561678 B CN 107561678B
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Abstract
The invention discloses an imaging optical system of an operating microscope, which comprises a beam splitter prism, a first lens, a second lens and a third lens, wherein the beam splitter prism, the first lens, the second lens and the third lens are sequentially arranged along a central optical axis. The first lens is a positive focal power lens and is provided with a first light beam incidence surface and a first light beam emergent surface, and the first light beam incidence surface is opposite to the beam splitting prism. The second lens is a negative focal power lens and is provided with a second light beam incidence surface and a second light beam emergent surface, and a first distance is formed between the second light beam incidence surface and the first light beam emergent surface along the central optical axis. The third lens is a positive focal power lens and is provided with a third light beam incidence surface and a third light beam emergent surface, a second distance is formed between the third light beam incidence surface and the second light beam emergent surface along the central optical axis, and the third light beam emergent surface is opposite to the charge coupling element image surface of the operating microscope. Wherein the first interval is 4 mm-1.2 mm, and the second interval is 4.4 mm-1.35 mm. The invention is not easy to cause light energy loss and can be suitable for different CCDs.
Description
Technical Field
The invention belongs to the technical field of optical system design, and particularly relates to an operation microscope image pickup optical system.
Background
The operation microscope enlarges the operation visual field, enables doctors to clearly see the fine structure of the operation part, can perform various microsurgery which can not be completed by naked eyes, expands the operation treatment range, improves the operation fine degree, and is widely applied to a plurality of medical fields of ophthalmology, otorhinolaryngology, stomatology, neurosurgery, hand surgery, gynecology and the like. The imaging system of the operation microscope is generally used as an optional accessory of the operation microscope, is connected in the optical path of the operation microscope, divides a part of light from a main optical path, and can provide operation surface information in the visual field of a doctor to a Charge-coupled Device (CCD) during an operation so that the imaging system can shoot various optical images and videos of the operation process, and the operation team can conveniently observe the operation process.
The existing operating microscope image pickup optical system is the 'operating microscope image pickup device' disclosed in the Chinese patent application with the publication number 'CN 104155746A', a reflecting mirror is adopted to turn a light path, although the purpose of turning the light path can be achieved, the device is not easy to install and adjust, and only can be suitable for one specific CCD, if different CCDs (such as an infrared CCD, a visible CCD and a special CCD only responding to a certain special spectrum band) are replaced, the whole image pickup optical system needs to be redesigned and replaced.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: aiming at the defect that the existing operating microscope camera optical system is easy to cause light energy loss and is only suitable for a specific CCD, the operating microscope camera optical system which is not easy to cause light energy loss, is convenient to install and adjust and is suitable for different CCDs is provided.
(II) technical scheme
In order to solve the above technical problem, the present invention provides an imaging optical system for an operating microscope, having a central optical axis, including a beam splitter prism disposed on the central optical axis, and further including:
the first lens is a positive focal power lens and is provided with a first light beam incidence surface and a first light beam emergent surface, and the first light beam incidence surface is opposite to the beam splitting prism;
the second lens is a negative focal power lens and is provided with a second light beam incidence surface and a second light beam emergent surface, and a first distance is formed between the second light beam incidence surface and the first light beam emergent surface along the central optical axis; and
the third lens is a positive focal power lens and is provided with a third light beam incidence surface and a third light beam emergent surface, a second distance is formed between the third light beam incidence surface and the second light beam emergent surface along the central optical axis, and the third light beam emergent surface is opposite to the charge coupling element image surface of the operating microscope;
wherein the first interval is 4 mm-1.2 mm, and the second interval is 4.4 mm-1.35 mm.
And a third distance is reserved between the third light beam emergent surface and the charge coupled device image surface of the operating microscope along the central optical axis, and the third distance is larger than 40 mm.
Wherein a distance between the first light beam incident surface and the first light beam exit surface along the central optical axis is equal to a distance between the second light beam incident surface and the second light beam exit surface along the central optical axis and is equal to a distance between the third light beam incident surface and the third light beam exit surface along the central optical axis.
The spherical radius corresponding to the first light beam incidence surface is-25.1 mm, the spherical radius corresponding to the first light beam exit surface is 156.3mm, and the distance between the first light beam incidence surface and the first light beam exit surface along the central optical axis is 9.5 mm.
The optical glass adopted by the first lens is H-ZK 14.
The spherical radius corresponding to the second light beam incidence surface is 55.9mm, the spherical radius corresponding to the second light beam exit surface is-20.7 mm, and the distance between the second light beam incidence surface and the second light beam exit surface along the central optical axis is 9.5 mm.
The optical glass adopted by the second lens is H-F4.
The spherical radius corresponding to the third light beam incidence surface is-37.8 mm, the spherical radius corresponding to the third light beam exit surface is 52.7mm, and the distance between the third light beam incidence surface and the third light beam exit surface along the central optical axis is 9.5 mm.
Wherein the optical glass adopted by the third lens is H-ZK 21.
The optical glass adopted by the light splitting prism is H-K9L.
(III) advantageous effects
The operating microscope image pickup optical system provided by the technical scheme adopts the beam splitter prism and the three single lenses to realize the turning of the light path and the projection on the CCD, and the three lenses respectively adopt the positive focal power lens, the negative focal power lens and the positive focal power lens, so that the optical energy loss is not easy to cause, and the imaging optical system is suitable for different CCDs. Meanwhile, the system has high resolution, clear image, small color distortion, small system volume, large rear working distance and simpler and more convenient system operation.
Drawings
FIG. 1 is a view showing the construction of an imaging optical system of a surgical microscope according to the present invention;
FIG. 2 is an MTF curve of the surgical microscope imaging optical system of the present invention;
fig. 3 is a field curvature and distortion curve of the surgical microscope imaging optical system of the present invention.
The system comprises a beam splitter prism 1, a beam splitter prism 2, a first lens 21, a first light beam incidence surface 22, a first light beam emergence surface 3, a second lens 31, a second light beam incidence surface 32, a second light beam emergence surface 4, a third lens 41, a third light beam incidence surface 42, a third light beam emergence surface and a CCD image surface 5.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The focal length of the operation microscope camera optical system is 60mm, the back working distance is up to 40.4mm, and the total length of system components is 60 mm. As shown in fig. 1, the surgical microscope imaging optical system has a central optical axis a1, and includes a beam splitter prism 1, a first lens 2, a second lens 3, and a third lens 4, which are disposed on the central optical axis a1 and are sequentially disposed along the central optical axis. The beam splitter prism 1 has a function of splitting light from a main light path for use by a CCD, the splitting ratio of the beam splitter prism is determined by a plated splitting film, and the splitting ratio of a shooting light path and the main light path comprises various forms such as 5:5, 4:6, 3:7, 2:8 and the like. The first lens 2 is a positive power lens, and has a first light beam incident surface 21 and a first light beam exit surface 22, and the first light beam incident surface 21 is opposed to the beam splitter prism 1. The second lens 3 is a negative power lens having a second light beam incident surface 31 and a second light beam exit surface 32, and the second light beam incident surface 31 and the first light beam exit surface 22 have a first distance therebetween along the central optical axis a 1. The third lens 4 is a positive power lens, and has a third light beam incident surface 41 and a third light beam emergent surface 42, the third light beam incident surface 41 and the second light beam emergent surface 32 have a second distance along the central optical axis, and the third light beam emergent surface 42 is opposite to the CCD image plane 5 of the surgical microscope. In the invention, the first distance is 4 mm-1.2 mm, and the second distance is 4.4 mm-1.35 mm.
Preferably, the third light beam exit surface 42 has a third distance from the CCD image plane 5 of the surgical microscope along the central optical axis, the third distance being greater than 40 mm. The distance between the first light beam incident surface 21 and the first light beam exit surface 22 along the central optical axis is equal to the distance between the second light beam incident surface 31 and the second light beam exit surface 32 along the central optical axis, and equal to the distance between the third light beam incident surface 41 and the third light beam exit surface 42 along the central optical axis.
Obviously, the operation microscope image pickup optical system of the invention consists of a beam splitter prism and 3 single lenses, and has compact structure and simple and convenient processing and assembly and adjustment.
Table 1 below shows specific parameters of each surface of the optical system according to a preferred embodiment of the present invention, in which "serial numbers" are arranged from the light incident end, the light beam incident surface of the beam splitter prism 1 is serial number 1, the light beam exit surface is serial number 3, and so on; "radius of curvature" gives the radius of each lens surface separately; "pitch" shows the spacing between two adjacent surfaces along the central optical axis, and if two surfaces belong to the same lens, the pitch represents the thickness of that lens. The specific parameters of the optical system are as follows:
table 1 structural parameters of the operating microscope photographing optical system of the present invention
The invention adopts a beam splitter prism and three single lenses to realize the turning of the light path and the projection on the CCD, and has the advantages of high system resolution, clear image, small color distortion, small system volume and large rear working distance, thereby leading the system operation to be simpler and more convenient. The first lens 2, the second lens 3 and the third lens 4 form a camera objective group, so that light is converged on a CCD image surface, good imaging, clear image and no distortion are ensured, and the requirements of observation by a doctor and shooting and recording in the operation process are met. Furthermore, the distance setting among the first lens 2, the second lens 3 and the third lens 4 is the result after fully considering the requirements in installation, adjustment and actual use: firstly, the distance between the three is not too compact, so that the collision between the lenses and the difficulty in installation and debugging are avoided; secondly, the distance between the three is too far, so that the defects that the mechanical structure is too long and the system volume is too large due to too far, the overall volume of the operating microscope is influenced, and the use of a doctor is inconvenient are avoided; finally, the rear intercept of the whole camera system (namely, the distance between the third light beam emergent surface 42 and the CCD image surface 5 along the central optical axis, which is larger than 40mm) is ensured after the three parts are matched, so that the requirement of replacing the CCD can be met.
Table 2 below shows the optical glasses used in the optical system of the preferred embodiment of the present invention
TABLE 2 parameters of the optical glasses
| Optical glass | Refractive index nd | Coefficient of dispersion vd | λ80/λ5 |
| H-K9L | 1.51 | 64.2 | 33/29 |
| H-F4 | 1.62 | 36.35 | 39/36 |
| H-ZK14 | 1.60 | 60.6 | 35/30 |
| H-ZK21 | 1.62 | 58.12 | 36/30 |
Referring to fig. 2, the MTF curve of the imaging optical system of the surgical microscope of the present invention is shown. The curve can be used to obtain that the actual MTF curve of the image pickup optical system is close to the diffraction limit MTF curve, wherein the diffraction limit MTF curve is the theoretically optimal MTF curve of the system, but the actual MTF curve of the optical system can only be close to the diffraction limit MTF curve and cannot be reached because various unavoidable phase differences always exist in the actual system.
Referring to fig. 3, the field curvature and distortion curve of the imaging optical system of the surgical microscope of the present invention are combined. The curve shows that the maximum field curvature of the full view field of the imaging optical system of the operating microscope is 0.086, the maximum distortion of the full view field is 0.028%, and the imaging optical system is fully ensured to be clear and not deformed on a CCD.
Further, the experiment proves that the operation microscope photographing optical system can be at least suitable for 4 different CCDs, which are respectively as follows: visible light CCD, infrared CCD, CCD specific to ICG drug, and CCD specific to 5-ALA drug (ICG and 5-ALA are two fluorescence contrast drugs used most commonly in clinic); and when a fluorescence radiography function (so-called fluorescence radiography, which means that after a fluorescence radiography medicine is injected into tissues, the medicine emits light of a specific spectrum band under the irradiation of illumination light of a special spectrum band to form a fluorescence image with high identification degree, so that the timely feedback of important information in operation is ensured, such as whether tumors are completely removed and the like, and the operation efficiency and reliability are improved) is adopted, only different CCDs (charge coupled devices) need to be replaced, the inconvenience that the whole camera optical system needs to be replaced and the whole machine needs to be debugged at the present stage is avoided, the use in the medical process is facilitated, and a large amount of cost is reduced.
Obviously, the invention solves the problems of balanced imaging capability and good quality in different spectral bands, and is more convenient to use in the medical treatment process.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. An optical system for imaging of a surgical microscope, having a central optical axis, comprising a beam splitter prism disposed on the central optical axis, characterized by further comprising a light splitter prism disposed on the central optical axis and arranged in sequence along the central optical axis:
the first lens is a positive focal power lens and is provided with a first light beam incidence surface and a first light beam emergent surface, and the first light beam incidence surface is opposite to the beam splitting prism;
the second lens is a negative focal power lens and is provided with a second light beam incidence surface and a second light beam emergent surface, and a first distance is formed between the second light beam incidence surface and the first light beam emergent surface along the central optical axis; and
the third lens is a positive focal power lens and is provided with a third light beam incidence surface and a third light beam emergent surface, a second distance is formed between the third light beam incidence surface and the second light beam emergent surface along the central optical axis, and the third light beam emergent surface is opposite to the charge coupling element image surface of the operating microscope;
wherein the first distance is 4 mm-1.2 mm, and the second distance is 4.4 mm-1.35 mm;
a third distance is reserved between the third light beam emergent surface and a charge coupled device image surface of the operating microscope along the central optical axis, and the third distance is larger than 40 mm;
the distance between the first light beam incidence surface and the first light beam emergence surface along the central optical axis is equal to the distance between the second light beam incidence surface and the second light beam emergence surface along the central optical axis and equal to the distance between the third light beam incidence surface and the third light beam emergence surface along the central optical axis;
the spherical radius corresponding to the first light beam incidence surface is-25.1 mm, the spherical radius corresponding to the first light beam exit surface is 156.3mm, and the distance between the first light beam incidence surface and the first light beam exit surface along the central optical axis is 9.5 mm;
the spherical radius corresponding to the second light beam incidence surface is 55.9mm, the spherical radius corresponding to the second light beam exit surface is-20.7 mm, and the distance between the second light beam incidence surface and the second light beam exit surface along the central optical axis is 9.5 mm;
the spherical radius corresponding to the third light beam incidence surface is-37.8 mm, the spherical radius corresponding to the third light beam exit surface is 52.7mm, and the distance between the third light beam incidence surface and the third light beam exit surface along the central optical axis is 9.5 mm.
2. The surgical microscope imaging optical system according to claim 1, wherein the optical glass used for the first lens is H-ZK 14.
3. The surgical microscope imaging optical system according to claim 1, wherein the optical glass used for the second lens is H-F4.
4. The surgical microscope imaging optical system according to claim 1, wherein the optical glass used for the third lens is H-ZK 21.
5. The surgical microscope imaging optical system according to claim 1, wherein the optical glass used for the beam splitter prism is H-K9L.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710741303.2A CN107561678B (en) | 2017-08-25 | 2017-08-25 | Operation microscope camera optical system |
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| CN201710741303.2A CN107561678B (en) | 2017-08-25 | 2017-08-25 | Operation microscope camera optical system |
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| CN107561678B true CN107561678B (en) | 2020-06-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139267A (en) * | 1975-12-11 | 1979-02-13 | Canon Kabushiki Kaisha | Lens having high resolving power |
| CN201892780U (en) * | 2010-12-07 | 2011-07-06 | 桂林电子科技大学 | CaF2-free low-power plan apochromatic metallographic microscope |
| CN102341737A (en) * | 2009-03-10 | 2012-02-01 | 柯尼卡美能达精密光学株式会社 | Image-capturing optical system, image-capturing optical device, and digital equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003291701A1 (en) * | 2003-11-03 | 2004-06-06 | Dmetrix, Inc. | Miniature microscope objective lens |
| JP6579810B2 (en) * | 2015-06-10 | 2019-09-25 | キヤノン株式会社 | Observation optical system and image display apparatus having the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4139267A (en) * | 1975-12-11 | 1979-02-13 | Canon Kabushiki Kaisha | Lens having high resolving power |
| CN102341737A (en) * | 2009-03-10 | 2012-02-01 | 柯尼卡美能达精密光学株式会社 | Image-capturing optical system, image-capturing optical device, and digital equipment |
| CN201892780U (en) * | 2010-12-07 | 2011-07-06 | 桂林电子科技大学 | CaF2-free low-power plan apochromatic metallographic microscope |
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