CN108121064A - Capsule endoscope - Google Patents
Capsule endoscope Download PDFInfo
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- CN108121064A CN108121064A CN201810055019.4A CN201810055019A CN108121064A CN 108121064 A CN108121064 A CN 108121064A CN 201810055019 A CN201810055019 A CN 201810055019A CN 108121064 A CN108121064 A CN 108121064A
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- capsule endoscope
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- top hood
- image side
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- 239000002775 capsule Substances 0.000 title claims abstract description 129
- 238000003384 imaging method Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims description 12
- 230000003746 surface roughness Effects 0.000 claims description 9
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 3
- 239000006117 anti-reflective coating Substances 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 2
- 239000011521 glass Substances 0.000 description 12
- 238000013461 design Methods 0.000 description 11
- 238000007789 sealing Methods 0.000 description 11
- 239000003292 glue Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000009747 swallowing Effects 0.000 description 4
- 239000008280 blood Substances 0.000 description 3
- 210000004369 blood Anatomy 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000003902 lesion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000167880 Hirundinidae Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002052 colonoscopy Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2423—Optical details of the distal end
- G02B23/243—Objectives for endoscopes
-
- 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
- A61B1/00064—Constructional details of the endoscope body
- A61B1/00071—Insertion part of the endoscope body
- A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
- A61B1/00096—Optical elements
-
- 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
- A61B1/04—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 combined with photographic or television appliances
- A61B1/041—Capsule endoscopes for imaging
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- Optics & Photonics (AREA)
- Biomedical Technology (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pathology (AREA)
- Heart & Thoracic Surgery (AREA)
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- Radiology & Medical Imaging (AREA)
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Abstract
The present invention provides a kind of capsule endoscope, which includes the transparent top hood and lens group of coaxial arrangement from object side to image side successively, wherein：The transparent top hood has negative power, wherein, the first object side of the transparent top hood is the first convex surface near axis area, and the first image side surface of the transparent top hood is the first concave surface near axis area, and first convex surface and first concave surface are spherical surface.Capsule endoscope provided by the present invention has the advantages that size is small, visual field is big, high resolution, rich in color, visible ray and near infrared light dual-waveband imaging.
Description
Technical field
The present invention relates to the field of medical instrument technology more particularly to a kind of capsule endoscopes.
Background technology
For lumenal tissues lesions such as detection human stomach, intestines, mode most commonly seen in early days is using gastroscope, colonoscopy etc.
Plug-in type scope instrument measures.Due to when plug-in type scope instrument works its picture shooting assembly need it is strong by positions such as throats
Property processed reaches patient's body, therefore causes the usage experience of this instrument excessively poor so that many poor resistances, it is old and frail or
The patient being in a bad way hangs back to it.As the capsule endoscope minimized occurs in the development of science and technology, in this capsule
Sight glass can enter patient's body by way of oral.After capsule endoscope enters patient's body, gastral wriggling makes glue
Intracapsular sight glass moves in alimentary canal, capsule endoscope acquisition image and by image transmitting to patient's external figure while movement
As display device, situation about suffering from alimentary canal is understood in real time for medical worker.Final capsule endoscope is discharged from patient's body.
Although existing capsule endoscope brings better usage experience for patient, its still have it is certain not
Foot part：
Firstth, in the prior art, the transparent top hood (generally use hemispherical design) of capsule endoscope functions only as close
Envelope act on, and in capsule endoscope as, there are a certain distance, this has virtually resulted in glue between the lens group of camera lens
Waste of the intracapsular sight glass on axial dimension, it is bigger so as to cause the size of capsule endoscope, bring one for swallowing for patient
Fixed inconvenience.
Secondth, the existing smaller shortcoming of capsule endoscope generally existing field range.Most of glue on the market at present
Its field range of intracapsular sight glass is within 100 °, and only the field range of sub-fraction capsule endoscope can reach 120 °.Pin
For this sub-fraction capsule endoscope that field range can reach 120 °, lens group usually requires three pieces or three pieces
Above non-spherical lens realizes that this, which allows for lens group, often has larger size and higher cost, and then right
The size and cost of capsule endoscope also result in certain influence.
3rd, the shortcomings that existing capsule endoscope generally existing resolution ratio is not high, color is not abundant enough, in human intracavity
Substantially in dark pink colour, blood penetration and pathological tissues substantially take on a red color or the background of black under, what capsule endoscope collected
Image often distinguishes difficult, it is therefore desirable to which the intervention of image procossing could well carry out capsule endoscope the image collected
It distinguishes, this can undoubtedly increase the complexity of post-processing, so as to cause the increase of capsule endoscope structure complexity, and then to glue
Intracapsular sight glass Miniaturization Design increases difficulty.
4th, existing capsule endoscope is only capable of realizing the imaging of visible ray, and visible ray is only applicable in observation human body
The surface layer of chamber and can not tissue visualization and the inside lesion of blood well, that is to say, that deposited using existing capsule endoscope
The possibility of lesion inside tissue and blood can not be being found in time.
The content of the invention
In order to overcome drawbacks described above of the prior art, the present invention provides a kind of capsule endoscope, the capsule endoscopes
Include the transparent top hood and lens group of coaxial arrangement successively from object side to image side, wherein：
The transparent top hood has negative power, wherein, the first object side of the transparent top hood is the near axis area
One convex surface, the first image side surface of the transparent top hood are the first concave surfaces near axis area, first convex surface and described first recessed
Face is spherical surface.
According to an aspect of the present invention, in the capsule endoscope, the scope of the radius of curvature on first convex surface is
3.5mm to 20mm, the scope of the radius of curvature of first concave surface is 0.39mm to 0.45mm.
According to another aspect of the present invention, in the capsule endoscope, the table of first convex surface and first concave surface
Surface roughness is less than the surface roughness in other regions in the first object side and first image side surface.
According to a further aspect of the invention, in the capsule endoscope, the lens group includes successively from object side to image side
The first lens with positive light coke and with the second lens of negative power.
According to a further aspect of the invention, in the capsule endoscope, the scope of first power of lens is
1.25 to 2.08, the scope of second power of lens is -1.43 to -1.16.
According to a further aspect of the invention, in the capsule endoscope, the second object side of first lens is paraxial
Region is the second convex surface, and the second image side surface of first lens is the 3rd convex surface near axis area；The of second lens
Three object sides are the 4th convex surfaces near axis area, and the 3rd image side surface of second lens is the second concave surface near axis area；Institute
It is spherical surface to state the second convex surface, the 3rd convex surface, the 4th convex surface and second concave surface.
According to a further aspect of the invention, in the capsule endoscope, except described first is convex in the first object side
Region in region and first image side surface outside face in addition to the first concave surface is coated with black；First lens
On second object side and the surface of the second image side surface and the 3rd object side of second lens and the surface of the 3rd image side surface
On be coated with antireflective coating.
According to a further aspect of the invention, in the capsule endoscope, the material of the transparent top hood is medical grade
Makconal2458, the material of first lens is POLYCARB, and the material of second lens is POLYSTYR.
According to a further aspect of the invention, in the capsule endoscope, the transparent top hood include overhead guard body and with
The integrally formed lens support of overhead guard body, the lens group are fixed in the lens support.
According to a further aspect of the invention, in the capsule endoscope, the lens support is equipped with frame, the lens
Group is fixed on by trim ring in the frame.
According to a further aspect of the invention, in the capsule endoscope, the capsule endoscope is further included positioned at image side
Imaging sensor, described image sensor are fixed on sensor stand, screw thread between the sensor stand and the trim ring
Connection.
Capsule endoscope provided by the present invention is since its transparent top hood has negative power, hence transparent top hood is simultaneous
Have sealing function and imaging function, that is to say, that transparent top hood while sealing function is played, also and lens group together as
The camera lens of capsule endoscope is imaged, thus, efficiently avoid size wasting phenomenon in existing capsule endoscope
Occur, while also efficiently reduce the length of capsule endoscope so that capsule endoscope is easier to swallowing for patient.In addition,
The field range of capsule endoscope can also effectively be expanded using the transparent top hood with negative power, shorten capsule endoscope
Focal length, improve capsule endoscope resolution ratio, abundant capsule endoscope imaged color and will be into capsule endoscope
Light extends near infrared light from visible ray.
Description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, of the invention is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is the cross-sectional view of the capsule endoscope of a specific embodiment according to the present invention；
Fig. 2 be in capsule endoscope shown in Fig. 1 transparent top hood and lens group in the structure diagram of near axis area；
Fig. 3 is the imaging schematic diagram of structure shown in Fig. 2.
The same or similar reference numeral represents the same or similar component in attached drawing.
Specific embodiment
For a better understanding and interpretation of the present invention, below in conjunction with attached drawing, the present invention is described in further detail.
The present invention provides a kind of capsule endoscope, which includes coaxial arrangement successively from object side to image side
Transparent top hood and lens group, wherein：
The transparent top hood has negative power, wherein, the first object side of the transparent top hood is the near axis area
One convex surface, the first image side surface of the transparent top hood are the first concave surfaces near axis area, first convex surface and described first recessed
Face is spherical surface.
The structure of capsule endoscope provided by the present invention is described in detail below.
Specifically, capsule endoscope includes transparent top hood successively from object side to image side and is covered by transparent top hood saturating
Microscope group, wherein, the coaxial arrangement of the optical axis of transparent top hood and the optical axis coincidence of lens group, i.e. transparent top hood and lens group.The present invention
The capsule endoscope provided, transparent top hood have negative power, wherein, the object side of transparent top hood is (i.e. in transparent top hood
Close to the surface of object side, hereinafter represented with the first object side) near axis area it is convex surface (hereinafter being represented with the first convex surface),
The image side surface (close to the surface of image side i.e. in transparent top hood, hereinafter being represented with the first image side surface) of transparent top hood is near axis area
It is concave surface (hereinafter being represented with the first concave surface).In addition, the first convex surface and the first concave surface use spherical design.Due to transparent top
Cover has negative power, and therefore, for transparent top hood in addition to playing the role of being sealed capsule endoscope, transparent top hood is (main
If near axis area) it is also used as correction of a piece of lens for aberration, that is to say, that and transparent top hood and lens group one act as
It is participated in for the camera lens of capsule endoscope in the imaging of capsule endoscope.Thus, it is peeped in capsule provided by the present invention
In mirror, transparent top hood has both sealing function and imaging function simultaneously.It is herein it should be noted that paraxial due to transparent top hood
Region participates in imaging and other regions and is not involved in being imaged, and therefore, the present invention is to other areas outside transparent top hood near axis area
The structure in domain does not make any specific restriction, and every near axis area meets above-mentioned design and can be used for capsule endoscope sealing
Transparent top hood be included in the present invention protect in the range of, for brevity, no longer transparent top hood is possible to herein
Structure enumerated.
Preferably, the scope of the radius of curvature on the first convex surface in transparent top hood is 3.5mm to 20mm, such as 3.5mm,
6.5mm, 10mm, 15mm, 20mm etc., the scope of the radius of curvature of the first concave surface in transparent top hood is 0.39mm to 0.45mm,
Such as 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm etc..It will be appreciated by those skilled in the art that
, the scope of the radius of curvature of above-mentioned first convex surface and the first concave surface is only preferred embodiment, every to make transparent top
Cover can participate in capsule endoscope imaging with negative power and not influence the first convex surface that capsule endoscope swallows and first recessed
The radius of curvature in face each fall within the present invention protect in the range of.
Due in transparent top hood near axis area participate in capsule endoscope imaging and other regions only play sealing make
With therefore, in order to which the near axis area for alloing transparent top hood is preferably imaged, it is preferable that make the object side of the near axis area (i.e.
First convex surface) and the near axis area image side surface (i.e. the first concave surface) have smaller surface roughness, that is to say, that first
The surface roughness of convex surface and the first concave surface is less than the table on the first convex surface in transparent top hood and other regions outside the second concave surface
Surface roughness.In a specific embodiment, the surface roughness of the first convex surface and the first concave surface is 0.008 μm, transparent top hood
In the surface roughness in other regions outside the first convex surface and the first concave surface be 1.6 μm.
Preferably, the lens group of capsule endoscope includes the first lens and the second lens successively from object side to image side, also
It is to say, lens group is made of two lens.In order to which, with synthesized image, the first lens design is with the transparent top hood with negative power
With positive light coke, the second lens design is with negative power.Wherein, the scope of the first power of lens is preferably 1.25
To 2.08, such as 1.25,1.5,1.8,2.08 etc., the scope of the second power of lens is preferably -1.43 to -1.16, such as -
1.43rd, -1.35, -1.24, -1.16 etc..In a specific embodiment, the object side of the first lens is (i.e. close in the first lens
The surface of object side is hereinafter represented with the second object side) near axis area it is convex surface (hereinafter being represented with the second convex surface), first
The image side surface (i.e., close to the surface of image side in the first lens, hereinafter being represented with the second image side surface) of lens is convex near axis area
Face (hereinafter represents) with the 3rd convex surface, wherein, the second convex surface and the 3rd convex surface are spherical surface；The object side of second lens is (i.e.
Close to the surface of object side in second lens, hereinafter represented with the 3rd object side) near axis area it is convex surface (hereinafter with the 4th
Convex surface represents), the image side surface (i.e., close to the surface of image side in the second lens, hereinafter being represented with the 3rd image side surface) of the second lens
It is concave surface (hereinafter being represented with the second concave surface) near axis area, wherein, the 4th convex surface and the second concave surface are spherical surface.It needs herein
It is noted that the near axis area of the first lens and the second lens participates in the imaging of capsule endoscope, and outside near axis area
Other regions are only used for the assembling (other regions outside lens near axis area hereinafter are known as assembly area) of lens, because
This, its object side of the assembly area of the first lens and the second lens and image side surface use planar structure.Art technology
Personnel are it is understood that the near axis area of above-mentioned second object side and the second image side surface is convex surface, the 3rd object side and
The near axis area of three image side surfaces is respectively convex surface and concave surface is only schematic example, in other embodiments, the second object side,
Two image side surfaces, the 3rd object side, the near axis area of the 3rd image side surface can also use other design methods, for example, second
The near axis area of object side and the second image side surface is that the near axis area on convex surface, the 3rd object side and the 3rd image side surface is respectively recessed
Face and convex surface for brevity, herein no longer carry out the structure that is possible to of the first lens and the second lens near axis area
It enumerates.In addition, those skilled in the art will also be appreciated that the model of above-mentioned first lens and the second power of lens
Only preferred embodiment is enclosed, in other embodiments, the scope of the first lens and the second power of lens can also be set
For other numerical value, capsule can be well realized when the first lens, the second lens and transparent top hood are used cooperatively as long as can guarantee
Endoscopic imaging.In the prior art, the lens group in capsule endoscope usually requires at least three pieces lens composition, and this hair
Bright provided capsule endoscope due to transparent top hood have negative power can together participate in being imaged with lens group, hence
The imaging that capsule endoscope can be realized in two panels lens is used only in lens group, so as to effectively reduce the quantity of lens, and then
Significantly reduce the cost of capsule endoscope.In addition, in existing capsule endoscope, the region that lens participate in imaging is usual
Aspheric design, and in capsule endoscope provided by the present invention, the region that lens participate in imaging uses common spherical design,
Compared with aspheric design, common spherical design can be effectively reduced the required precision of processing and assembling.
Preferably, it is additionally provided with diaphragm between transparent top hood and the first lens.In a specific embodiment, diaphragm is tight
The the second object side for pasting the first lens is set, wherein, the bore of diaphragm is equal to the clear aperture of first the second object of lens side.
Non-imaged light beam impacts the imaging of capsule endoscope in order to prevent, it is preferable that makes the paraxial of transparent top hood
Region keeps transparent, by the surface blacking in other regions outside transparent top hood near axis area, i.e. except the in the first object side
Region in region and the first image side surface outside one convex surface in addition to the first concave surface is coated with black and in the first lens
The second object side and the second image side surface surface on, plate and subtract on the surface of the 3rd object side of the second lens and the 3rd image side surface
Reflectance coating forms ghost image thus, can be effectively prevented non-imaged light beam and enter in the imaging sensor of capsule endoscope.
Transparent top hood is made of medical grade sealing material, such as Makconal2458.First lens use POLYCARB
It is made, the second lens are made of POLYSTYR.It will be appreciated by persons skilled in the art that the example above is only to be preferably implemented
Mode, it is every to be surveyed by related medical safety standard not to the restriction of transparent top hood, the first lens and the second lens material
Examination grade is used equally for forming transparent top hood, every material that can form lens available for sealing and transparent material
For forming the first lens and the second lens, such as Xiao Te glass etc., for brevity, herein no longer to transparent top hood, the
The institute of the material of one lens and the second lens is it is possible that enumerated.
It is directed to for capsule endoscope, if deviation occurs for the distance between lens, influences whether capsule endoscope
Imaging effect even result in capsule endoscope can not normal imaging, it is therefore necessary to ensure the accuracy of distance between lens.
It is directed to for capsule endoscope provided by the present invention, transparent top hood is participated in into together as a piece of lens and lens group
Picture, it is therefore desirable to ensure that the distance between transparent top hood and lens group will not change in capsule endoscope whole work process
Become.Based on above-mentioned consideration, it is preferable that transparent top hood includes overhead guard body and the lens supports being fixedly connected with the overhead guard body
Portion, lens group are fixed in the lens support, thus, which the whole work process in capsule endoscope can be effectively ensured
Middle lens group and the relative position of transparent top hood will not change, and then ensure the distance between lens group and transparent top hood
It will not change.Even if transparent top hood loosens during operation of capsule endoscope, but due to lens group and transparent top
The distance between cover will not change, and will not influence the imaging effect of capsule endoscope.It is highly preferred that overhead guard body and thoroughly
Mirror support portion is integrally formed, so as to further ensure the accuracy of distance between lens group and transparent top hood.Herein
It should be noted that the concrete structure of the invention for lens support is there is no any restriction, it is every to can be used for fixing thoroughly
Microscope group makes transparent top hood and lens group that can be each fallen with the support construction of normal imaging in protection scope of the present invention.In a tool
In body embodiment, the frame to match with lens group is offered in lens support, after lens group is put into frame, profit
Lens group is fixed in the frame with trim ring, wherein, trim ring can be adhesively fixed by such as epoxide-resin glue with frame.This
Outside it should be noted that the setting of the distance between lens can be by setting between lens with certain thickness in lens group
Gasket is realized.
Imaging sensor in capsule endoscope is located at image side, and position is also most important for imaging effect, equally
Influence whether the imaging effect of capsule endoscope.Preferably, imaging sensor and transparent top hood are fixed, thus,
Transparent top hood, lens group and imaging sensor are fixed together, and no matter how capsule endoscope moves, transparent top hood, thoroughly
The distance between microscope group and imaging sensor will not all change, so that it is guaranteed that capsule endoscope can be with normal imaging.
In one specific embodiment, imaging sensor is fixed on sensor stand, and sensor stand is fixed on trim ring.More preferably
Ground is provided with the first screw thread on sensor stand, the second screw thread to match with first screw thread, sensor is provided on trim ring
Stent and trim ring are realized by the first screw thread and the second screw thread to be threadedly coupled, thus, on the one hand sensor can be fixed
It on trim ring and then realizes the fixation of sensor and transparent top hood, on the other hand can also pass through the position of threaded adjusting sensor
It puts, ensures imaging clearly.
In existing capsule endoscope, transparent top hood functions only as sealing function, and with the lens group as camera lens it
Between have a certain distance, this has virtually resulted in the waste of certain size.And in capsule endoscope provided by the present invention,
Transparent top hood has negative power so that transparent top hood has both sealing function and imaging function, that is to say, that transparent top hood is rising
While to sealing function, also it is imaged with lens group together as the camera lens of capsule endoscope, thus, effectively keep away
The appearance of size wasting phenomenon in existing capsule endoscope is exempted from, while has also efficiently reduced the length of capsule endoscope, made
It obtains capsule endoscope and is easier to swallowing for patient.In addition, can also effectively it be expanded using the transparent top hood with negative power
The field range of capsule endoscope, the length for shortening capsule endoscope while the resolution ratio of capsule endoscope is ensure that, into glue
The light of intracapsular sight glass extends near infrared light from visible ray, enriches the imaged color of capsule endoscope.
Capsule endoscope provided by the present invention is illustrated with a specific embodiment below.
It please refers to Fig.1, Fig. 1 is the cross-section structure signal of the capsule endoscope of a specific embodiment according to the present invention
Figure.As shown in the figure, capsule endoscope includes capsule housing 300 and the transparent top hood being used cooperatively with the capsule housing 300,
In, transparent top hood further comprises overhead guard body 100 and lens support 101.It is formed in transparent top hood and capsule housing 300
Enclosure space in be provided with lens group and imaging sensor.Lens group includes 120 He of the first lens successively from object side to image side
Second lens 130, wherein, transparent top hood 100, the first lens 120 and the second lens 130 be coaxially disposed (optical axis in figure with
Label 200 represents).Imaging sensor is located at image side, including protective glass 140a and photosensitive array 140b.In addition, in capsule
Sight glass further includes diaphragm 110, which is arranged on the second object side of the first lens 120, wherein, the bore of diaphragm 110
Equal to the clear aperture of the second object side.Gasket 400 is provided between first lens 120 and the second lens 130.Lens group passes through
Trim ring 500 is fixed in the frame of lens support 101, and imaging sensor is fixed on sensor stand 140c, sensor branch
It is threadedly coupled between frame 140c and trim ring 500.It should be noted that due to the present invention inventive point only with capsule endoscope into
As related, therefore, the component (such as lighting system, signal receiving and transmitting system, power supply etc.) of imaging it is not related in capsule endoscope simultaneously
It is not shown.Fig. 2 be in capsule endoscope shown in Fig. 1 transparent top hood and lens group near axis area structure diagram,
As shown in the figure, the near axis area of transparent top hood, the first lens and the second lens is respectively with label 100a, 120a and 130a table
Show.In the following, the capsule endoscope provided with reference to Fig. 1 and Fig. 2 the present embodiment is illustrated.
In the present embodiment, transparent top hood is made of medical grade material Makconal2458.First object of transparent top hood
Side is convex surface S1 near axis area, and the first image side surface of transparent top hood is concave surface S2, convex surface S1 and concave surface S2 near axis area
It is spherical surface.Wherein, the subsequent corrosion of convex surface S1 is 5.5mm, the clear aperture Φ of convex surface S11It is 2.31mm；The song of concave surface S2
Radius surface is 0.41mm, the clear aperture Φ of concave surface S22It is 0.81mm.The thickness D of transparent top hood1(i.e. the first object of transparent top hood side
The distance between the vertex in face and the vertex of the first image side surface) it is 0.39mm.The distance between transparent top hood and the first lens 120
L1The distance between (i.e. the vertex of the first image side surface of transparent top hood with the vertex of 120 second object side of the first lens) is
1.25mm。
First lens 120 are made of POLYCARB.Second object side of the first lens 120 is convex surface near axis area
S3, the second image side surface of the first lens 120 are that convex surface S4, convex surface S3 and convex surface S4 are spherical surface near axis area.Wherein, convex surface
The radius of curvature of S3 is 1.09mm, the clear aperture Φ of convex surface S33It is 0.18mm；The subsequent corrosion of convex surface S4 is 0.5mm, convex surface
The clear aperture Φ of S44It is 0.25mm.The thickness D of first lens 1202(the i.e. vertex of 120 second object side of the first lens and the
The distance between vertex of two image side surfaces) it is 0.15mm.The distance between first lens 120 and the second lens 130 L2(i.e. first
The distance between the vertex of 120 second image side surface of lens and the vertex of the 3rd object side of the second lens 130) it is 0.12mm.Diaphragm
110 bore and the clear aperture Φ of convex surface S33It is equal.
Second lens 130 are made of POLYSTYR.3rd object side of the second lens 130 is convex surface near axis area
S5, the 3rd image side surface of the second lens 130 are that concave surface S6, convex surface S5 and concave surface S6 are spherical surface near axis area.Wherein, convex surface
The radius of curvature of S5 is 1.68mm, the clear aperture Φ of convex surface S55It is 0.33mm；The subsequent corrosion of concave surface S6 is 0.76mm, recessed
The clear aperture Φ of face S66It is 0.42mm.The thickness D of second lens 1303(i.e. the vertex of the 3rd object side of the second lens 130 with
The distance between vertex of 3rd image side surface) it is 0.33mm.In second lens 130 and imaging sensor between protective glass 140a
Distance L3(i.e. the distance between the vertex of the 3rd image side surface of the second lens 130 and protective glass 140a) is 0.11mm.
The imaging schematic diagram for the capsule endoscope that the present embodiment is provided can refer to Fig. 3.Wherein, in the capsule of the present embodiment
Sight glass its focal length is equal to 0.35mm, and visual field is up to 160 ° or more, and F-number (F) is 5-7, depth of field 0.5mm-35mm, 0.5mm work
Make away from when object space resolution ratio up to 8lp/mm, it can be achieved that the ripple of visible ray and near infrared light dual-waveband imaging, wherein near infrared light
It is long 1 μm reachable.
Capsule endoscope provided by the present invention is since its transparent top hood has negative power, hence transparent top hood is simultaneous
Have sealing function and imaging function, that is to say, that transparent top hood while sealing function is played, also and lens group together as
The camera lens of capsule endoscope is imaged, thus, efficiently avoid size wasting phenomenon in existing capsule endoscope
Occur, while also efficiently reduce the length of capsule endoscope so that capsule endoscope is easier to swallowing for patient.In addition,
The field range of capsule endoscope can also effectively be expanded using the transparent top hood with negative power, shorten capsule endoscope
Focal length, improve capsule endoscope resolution ratio, abundant capsule endoscope imaged color and will be into capsule endoscope
Light extends near infrared light from visible ray.
The application range of the present invention is not limited to the technique of specific embodiment described in specification, mechanism, manufacture, substance
Composition and means.It from the disclosure, will readily appreciate that as those of ordinary skill in the art, at present
In the presence of or technique, mechanism, manufacture, material composition and the means that will develop later, wherein they perform and retouched with the present invention
The function or acquisition that the correspondence embodiment stated is substantially the same be substantially the same as a result, can be answered according to the present invention them
With.Therefore, appended claims of the present invention are intended to these techniques, mechanism, manufacture, material composition or means included in its protection
In the range of.
Claims (11)
1. a kind of capsule endoscope, which includes the transparent top hood and thoroughly of coaxial arrangement from object side to image side successively
Microscope group, wherein：
The transparent top hood has negative power, wherein, the first object side of the transparent top hood is first convex near axis area
Face, the first image side surface of the transparent top hood are the first concave surfaces near axis area, and first convex surface and first concave surface are equal
For spherical surface.
2. capsule endoscope according to claim 1, wherein, the scope of the radius of curvature on first convex surface is 3.5mm
To 20mm, the scope of the radius of curvature of first concave surface is 0.39mm to 0.45mm.
3. capsule endoscope according to claim 1, wherein：
The surface roughness of first convex surface and first concave surface is less than the first object side and first image side surface
In other regions surface roughness.
4. capsule endoscope according to any one of claim 1 to 3, wherein, the lens group from object side to image side according to
Secondary the first lens including with positive light coke and with the second lens of negative power.
5. capsule endoscope according to claim 4, wherein, the scope of first power of lens be 1.25 to
2.08, the scope of second power of lens is -1.43 to -1.16.
6. capsule endoscope according to claim 4, wherein：
Second object side of first lens is the second convex surface near axis area, and the second image side surface of first lens is near
Axis region is the 3rd convex surface；
3rd object side of second lens is the 4th convex surface near axis area, and the 3rd image side surface of second lens is near
Axis region is the second concave surface；
Second convex surface, the 3rd convex surface, the 4th convex surface and second concave surface are spherical surface.
7. capsule endoscope according to claim 6, wherein：
Except first is recessed in region and first image side surface in the first object side in addition to first convex surface
Region outside face is coated with black；
On second object side of first lens and the surface of the second image side surface and the 3rd object side of second lens
Antireflective coating is coated with on the surface of the 3rd image side surface.
8. capsule endoscope according to claim 4, wherein, the material of the transparent top hood is medical grade
Makconal2458, the material of first lens is POLYCARB, and the material of second lens is POLYSTYR.
9. capsule endoscope according to claim 1, wherein：
The transparent top hood include overhead guard body and with the integrally formed lens support of overhead guard body, the lens group consolidates
It is scheduled in the lens support.
10. capsule endoscope according to claim 9, wherein：
The lens support is equipped with frame, and the lens group is fixed on by trim ring in the frame.
11. capsule endoscope according to claim 10, wherein：
The capsule endoscope further includes the imaging sensor positioned at image side, and described image sensor is fixed on sensor stand
On, it is threadedly coupled between the sensor stand and the trim ring.
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| CN201810055019.4A CN108121064B (en) | 2018-01-19 | 2018-01-19 | Capsule endoscope |
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| CN108873264A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | The optical system of capsule endoscope |
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| CN108121064B (en) | 2023-10-27 |
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