CN108761746A - Big depth of field wide-angle laparoscope/thoracic cavity lens head - Google Patents
Big depth of field wide-angle laparoscope/thoracic cavity lens head Download PDFInfo
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- CN108761746A CN108761746A CN201810888554.8A CN201810888554A CN108761746A CN 108761746 A CN108761746 A CN 108761746A CN 201810888554 A CN201810888554 A CN 201810888554A CN 108761746 A CN108761746 A CN 108761746A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/313—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for introducing through surgical openings, e.g. laparoscopes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/313—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for introducing through surgical openings, e.g. laparoscopes
- A61B1/3132—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for introducing through surgical openings, e.g. laparoscopes for laparoscopy
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Biophysics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Endoscopes (AREA)
Abstract
The invention discloses a kind of big depth of field wide-angle laparoscope/thoracic cavity lens head, which includes big visual-field beam constrained lens, correcting lens and the correcting lens group being arranged in order from the object side to the image side, and correcting lens and correcting lens group are used to control image-forming range；The first spacer ring is equipped between visual-field beam constrained lens and correcting lens greatly, the second spacer ring is equipped between correcting lens and correcting lens group；The focal length f1 satisfactions -1.5f of big visual-field beam constrained lens<f1<-0.9f；The focal length f2 of correcting lens meets 0.9f<f2<1.8f；The focal length f3 satisfactions -520f of correcting lens group<f3<∞；Wherein f is the lens focus.The present invention is directly realized by big 25~250mm of the depth of field without adjusting camera lens, and 90 ° of wide-angle, the depth of field covers range of operation, without waiting for regulating time, you can blur-free imaging.
Description
Technical field
The present invention relates to optical field more particularly to a kind of big depth of field wide-angle laparoscope/thoracic cavity lens heads.
Background technology
Laparoscope/thoracoscope is a kind of electronic imaging mirror with miniature video camera system, is used for Minimally Invasive Surgery.Laparoscope/
Thoracoscopic operation mostly uses 2~4 hole operation methods, utmostly avoids leaving the scar of strip at patient abdominal cavity position, restores
Afterwards, it is that the surface of a wound is small only at abdominal cavity position there are 1~3 0.5~1 centimetre of linear scar, pain is small, restores fast operation, because
Also someone is referred to as " keyhole " operation for this.The development of laparoscope/thoracoscopic operation alleviates the pain that patient operates on, simultaneously
So that the convalescence of patient is shortened, is the operation project quickly grown in recent years.
Laparoscope/thoracoscopic operation can inflate patients abdomen, promote surgical procedure space, and inflation postabdomen depth is general
In 200mm or so, operation optimum distance is between 50~60mm.Laparoscope/thoracoscope is mostly the hard mirror of optics, front end eyeglass at present
Complicated, quantity is more, and rear end needs the devices such as ocular lens adapter, and the imaging of the different depth of field is realized by adjusting image planes.Long distance
It is required for continuous shift position from when finding lesion and close-ups lesion, is required for manually or automatically adjusting when mobile every time
Image planes increase the operating procedure and operating time of doctor when needing certain waiting.
Invention content
The technical problem to be solved in the present invention is to be directed to finds disease at a distance using laparoscope/thoracoscope in the prior art
It is required for continuous shift position when stove and close-ups lesion, is required for manually or automatically adjusting lacking for image planes when mobile every time
It falls into, one kind is provided and is directly realized by big 25~250mm of the depth of field without adjusting, 90 ° of wide-angle, the depth of field covers range of operation, without waiting
Regulating time, big depth of field wide-angle laparoscope/thoracic cavity lens head of blur-free imaging.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of big depth of field wide-angle laparoscope/thoracic cavity lens head is provided, which includes being arranged in order from the object side to the image side
Big visual-field beam constrained lens, correcting lens and correcting lens group, correcting lens and correcting lens group be used to control imaging away from
From；
The first spacer ring is equipped between visual-field beam constrained lens and correcting lens greatly, between correcting lens and correcting lens group
Equipped with the second spacer ring；
The focal length f1 satisfactions -1.5f of big visual-field beam constrained lens<f1<-0.9f；The focal length f2 of correcting lens meets 0.9f
<f2<1.8f；The focal length f3 satisfactions -520f of correcting lens group<f3<∞；Wherein f is the lens focus.
Connect above-mentioned technical proposal, which is placed in compacting ring, the compacting ring endpiece be equipped with interconnecting piece, the interconnecting piece with it is micro-
Type CCD or COMS sensor connects.
Above-mentioned technical proposal is connect, which is external thread structure.
Above-mentioned technical proposal is connect, diaphragm is additionally provided between big visual-field beam constrained lens.
Above-mentioned technical proposal is connect, big visual-field beam constrained lens select high Abbe number glass, correcting lens group to select high and low
Abbe number glass material combines.
Above-mentioned technical proposal is connect, the first spacer ring and the second spacer ring are fixedly connected by dispensing mode with lens.
Above-mentioned technical proposal is connect, correcting lens group includes biconvex lens and concave-convex lens.
Above-mentioned technical proposal is connect, big visual-field beam constrained lens are single concavees lens, correcting lens are single convex lens.
Above-mentioned technical proposal is connect, the rear portion of correcting lens group is additionally provided with optical filter.
The beneficial effect comprise that：The present invention camera lens without adjust camera lens be directly realized by the big depth of field 25~
250mm, maximum wide-angle is up to 90 °, and the depth of field covers range of operation, without waiting for regulating time, you can blur-free imaging.And entire mirror
Header structure is simple, and number of lenses is few, and image quality is high, greatly reduces cost and improves yield rate.This camera lens is light-weight, knot
Structure is compact, and appearance and size is small, fully meets the demand of laparoscope/thoracoscope camera system.
Further, big visual-field beam is constrained with L1 microscope groups compared with high Abbe number glass, L2 and L3 microscope groups realize correction color
Difference and raising image quality effect, while the parameter of L2 and L3 microscope groups is adjusted, at same F/#, image space disc of confusion smaller can be made,
Realize the big depth of field.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is camera lens shape assumption diagram of the present invention；
Fig. 2 is camera lens internal structure chart of the present invention (being changed in rear figure)；
Fig. 3 is that the best operation of the present invention is schemed apart from lower full filed OTF；
Fig. 4 is the best operation of the present invention apart from lower chromaticity difference diagram；
Fig. 5 is the best operation of the present invention apart from lower full filed point range figure；
Fig. 6 is the best operation of the present invention apart from the lower curvature of field, distortion figure；
Fig. 7 is that image planes of the present invention are scheduled on the full filed point range figure under object distance 25mm and 250mm when under best operation distance；
Fig. 8 is that image planes of the present invention are scheduled on the OFT figures under object distance 25mm and 250mm when under best operation distance；
Fig. 9 is camera lens of the present invention band filter sheet structure figure；
Figure 10 is the index path of camera lens of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Problems solved by the invention is directly realized by big 25~250mm of the depth of field without adjusting, 90 ° of wide-angle, depth of field covering operation
Range, without waiting for regulating time, blur-free imaging.
The present invention designs a kind of fine definition, big 25~250mm of the depth of field, Micro laparoscopic/thoracoscope mirror of 90 ° of wide-angle
Head.It is that big visual-field beam constrains mirror, L2 that the sequence of camera lens from the object side to the image side, which is arranged in order as microscope group L1, L2 and L3, microscope group L1,
It is respectively that system corrects microscope group, while controlling image-forming range with L3.
Further, it is additionally provided with diaphragm L4 between L1 and L2, limitation light beam imaging aperture (aperture of the diaphragm 0.15f~
0.35f), the positions diaphragm L4 are not fixed, and can be changed between microscope group L1 and L2.It is clear that the camera lens realizes big 25~250mm of the depth of field
Clear imaging (being imaged on image planes I), 90 ° of visual fields of wide-angle have fully met the requirement of laparoscope/thoracoscope.
Mirror, small curvature are constrained to do first light beam using small radius of curvature and high Abbe number eyeglass L1 when this lens design
Radius can effectively constrain big visual field wide-angle light beam, and high Abbe number can reduce the generation of aberration again, and base is established for subsequent correction
Plinth；Then optimization is compensated with microscope group L2 and L3, microscope group L2 uses the collocation of high refractive index and high Abbe number, further to press
Contracting turnover beam course, ensure that the outer diameter of camera lens；Microscope group L3 is designed using glued mirror, using larger Abbe number and refraction
The design of rate difference, further corrected aberration and control image space, finally with 4 lens designs meet the big depth of field, extensively
The high quality of angle mirror head is imaged.
This lens construction is simple, and number of lenses is few, and image quality is high, greatly reduces cost and improves yield rate.This
Camera lens is light-weight, compact-sized, and appearance and size is small, fully meets the demand of laparoscope/thoracoscope camera system.
As shown in Figure 1, in one embodiment of the invention, camera lens shape is cylindrical shape, mechanical overall length 7.0mm, mechanical outer diameter
4.5mm, outer diameter 5.5mm at screw thread.Camera lens front end is incidence end, and rear end screw thread can connect miniature CCD or COMS sensors.Camera lens
Main part is made of three microscope groups, is arranged in order from incident ray as microscope group L1, L2 and L3.L1 is single concavees lens, and L2 is also
Single convex lens, L3 are biconvex and the microscope group of concave-convex lens.When installation, by design sequence be sequentially loaded into L1, spacer ring 1, L2, spacer ring 2,
Spacer ring 3 and L3, are finally packed into compacting ring, control spacing by spacer ring, last compacting ring, which compresses, (can also use dispensing mode solid
It is fixed), all eyeglasses in lock jail are simple in structure, are easy dismounting.The camera lens index path of the present invention, as shown in Figure 10.
Fig. 2 show the internal structure of camera lens of the present invention.Referring to Fig. 2 and the following table 1, the lens wearer design parameter such as table 1
Shown, the first lens group of the camera lens is from left to right arranged in order, and lens focus is defined as f, eyeglass maximum outside diameter 3.2mm,
Fully meet the size requirement of laparoscope/thoracoscope.
1 lens parameters of table
Fig. 3 show camera lens and most preferably performs the operation the optical transfer function value (OTF) under.As can be seen from Figure, it regards entirely
Field OTF values are close to diffraction limit.Laparoscope/thoracoscope imaging is fully met when full filed OTF > 0.2 in 160lp/mm to want
It asks.
Fig. 4 show camera lens and most preferably performs the operation the lateral chromatism difference under.Wave band design alternative visible waveband (486~
656nm), full filed visible waveband lateral chromatic aberration < 1.5um are much smaller than Airy radius, can be considered no color differnece.
Fig. 5 show the point range figure that camera lens is most preferably performed the operation under.Point range figure on full filed all band focal plane is provided in figure,
Point range size is respectively less than Airy, imaging clearly.
Fig. 6 show camera lens and most preferably performs the operation the curvature of field and distortion curve under.Curvature of field maximum value 35um, appears in maximum
Under field angle, which does not influence to be imaged in focal depth range.Optical distortion increases with visual field and is increased 22%, which is to allow
Distortion value.
Fig. 7 (a), Fig. 7 (b) show complete under object distance 25mm and 250mm when camera lens image planes are scheduled on best operation under
Visual field point range figure.Position of focal plane is fixed under best operation distance first, then front and back instrumentality away from, respectively modulator away from
Under 25mm and object distance 250mm, depth field imaging effect is tested.Fig. 7 (a) provides the point range figure under object distance 25mm, central vision 98%
For envelope energy all in Airy, peripheral field envelope energy reaches 100%, under this object distance, during marginal definition is slightly above
The heart, but all can be considered imaging clearly.Fig. 7 (b) provides the point range figure under object distance 250mm, and completely by envelope, edge regards central vision
Field envelope degree reaches 99% or more, and under this object distance, center imaging definition is slightly above edge, is all imaging clearly.All in all,
Object distance farther out when, imaging it is apparent.
Fig. 8 (a), Fig. 8 (b) show the OTF under object distance 25mm and 250mm when camera lens image planes are scheduled on best operation under
Figure, the same to Fig. 7 (a) of test condition, Fig. 7 (b) are consistent.Fig. 8 (a) is the OTF curves under object distance 25mm, it can be seen that central vision
OTF be less than peripheral field, in 100lp/mm when OTF > 0.2, fully meet laparoscope/thoracoscope imaging resolution.Fig. 8 (b)
For the OTF curves under object distance 250mm, center coincide higher than edge and Fig. 7 point range figures, and close to diffraction limit, image quality is high.
Fig. 9 show camera lens band filter sheet structure figure of the present invention.It, can be in mirror of the present invention according to the imaging demand of different occasions
Optical filter L5 is added in the rear portion of head, and optical filter can be ultraviolet, infrared fileter, can also be that single spectrum penetrates optical filter, this
The design spectral region of invention camera lens is 400~700nm, and the imaging of single spectrum peculiar spectrum may be implemented in the spectral region, should
The big depth field imaging function of the present invention can be achieved in spectral region.It does not influence to be imaged after optical filter is added, slightly changing back focal length is
Blur-free imaging can be achieved, it is simple in structure, it adjusts and is easy.
This camera lens realizes fine definition, big 25~250mm of the depth of field, and maximum wide-angle is up to 90 ° of Micro laparoscopic/thoracic cavity
Lens head.Image quality is high, and simple in structure, easy to assemble, appearance and size is small to be adapted for mount on all kinds of laparoscopes/thoracoscope front end.
Number of lenses of the present invention only 4, the quantity of the eyeglass of reduction, but realizes the big depth of field compared with prior art.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of big depth of field wide-angle laparoscope/thoracic cavity lens head, which is characterized in that the camera lens includes arranging successively from the object side to the image side
Big visual-field beam constrained lens, correcting lens and the correcting lens group of row, correcting lens and correcting lens group be used to control at
Image distance from；
The first spacer ring is equipped between visual-field beam constrained lens and correcting lens greatly, is equipped between correcting lens and correcting lens group
Second spacer ring；
The focal length f1 satisfactions -1.5f of big visual-field beam constrained lens<f1<-0.9f；The focal length f2 of correcting lens meets 0.9f<f2<
1.8f；The focal length f3 satisfactions -520f of correcting lens group<f3<∞；Wherein f is the lens focus.
2. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 1, which is characterized in that the camera lens is placed in pressure
In collar, which is equipped with interconnecting piece, which connect with miniature CCD or COMS sensors.
3. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 2, which is characterized in that the interconnecting piece is outer
Helicitic texture.
4. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 1, which is characterized in that big visual-field beam is about
It is additionally provided with diaphragm between beam lens.
5. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 1, which is characterized in that big visual-field beam is about
Beam lens select high Abbe number glass, correcting lens group to select high and low Abbe number glass material combination.
6. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 1, which is characterized in that the first spacer ring and
Two spacer rings are fixedly connected by dispensing mode with lens.
7. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 1, which is characterized in that correcting lens group packet
Include biconvex lens and concave-convex lens.
8. big depth of field wide-angle laparoscope/thoracic cavity lens head according to claim 1, which is characterized in that big visual-field beam is about
Beam lens are single concavees lens, correcting lens are single convex lens.
9. big depth of field wide-angle laparoscope/thoracic cavity lens head according to any one of claim 1-8, which is characterized in that rectify
The rear portion of positive lens groups is additionally provided with optical filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810888554.8A CN108761746A (en) | 2018-08-07 | 2018-08-07 | Big depth of field wide-angle laparoscope/thoracic cavity lens head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810888554.8A CN108761746A (en) | 2018-08-07 | 2018-08-07 | Big depth of field wide-angle laparoscope/thoracic cavity lens head |
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| Publication Number | Publication Date |
|---|---|
| CN108761746A true CN108761746A (en) | 2018-11-06 |
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ID=63969238
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810888554.8A Pending CN108761746A (en) | 2018-08-07 | 2018-08-07 | Big depth of field wide-angle laparoscope/thoracic cavity lens head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458837A (en) * | 2020-04-09 | 2020-07-28 | 江苏匠岭半导体有限公司 | Broadband low-dispersion lens |
-
2018
- 2018-08-07 CN CN201810888554.8A patent/CN108761746A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458837A (en) * | 2020-04-09 | 2020-07-28 | 江苏匠岭半导体有限公司 | Broadband low-dispersion lens |
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