CN107728308A - Sight glass - Google Patents
Sight glass Download PDFInfo
- Publication number
- CN107728308A CN107728308A CN201711038132.3A CN201711038132A CN107728308A CN 107728308 A CN107728308 A CN 107728308A CN 201711038132 A CN201711038132 A CN 201711038132A CN 107728308 A CN107728308 A CN 107728308A
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- lens assembly
- sight glass
- breather line
- gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011521 glass Substances 0.000 title claims abstract description 38
- 238000007789 sealing Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract description 2
- 238000005538 encapsulation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229920001967 Metal rubber Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000005439 thermosphere Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding 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
- G02B23/2476—Non-optical details, e.g. housings, mountings, supports
- G02B23/2484—Arrangements in relation to a camera or imaging device
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
Abstract
The present invention discloses a kind of sight glass, including lens assembly and for encapsulating the first pipe fitting of lens assembly, also include breather line and the second pipe fitting being set in outside the first pipe fitting, there is gap between second pipe fitting and the first pipe fitting, breather line one end is used for external compressed air, and the gap between the other end and the second pipe fitting and the first pipe fitting connects；Compressed air enters from breather line flows through gap, lens assembly to the external world successively.Technical solution of the present invention in the first pipe fitting external series gap for being provided with lens assembly by being arranged the second pipe fitting, and the gap between external breather line and the second pipe fitting and the first pipe fitting is set to connect, compressed air is entered from breather line and flows through the gap, lens assembly to the external world successively, while to form high-speed air flow thermal insulation layer heat exchange is carried out with lens assembly, the function to lens assembly cooling is realized, so as to reach the effect that sight glass is capable of continuous firing at high temperature.
Description
Technical field
The present invention relates to special equipment field, more particularly to a kind of sight glass.
Background technology
With social industrial expansion, in order to check the technological work state in industrial equipment, increasing people in time
Using sight glass the function of state of the art is checked to realize.But sight glass of the prior art is not used to continuous high temperature environment
Middle work, the problem of causing camera lens module to burn out.
The content of the invention
The main object of the present invention is to propose a kind of sight glass, it is intended to solves sight glass in hot environment during continuous firing
The problem of camera lens module is burnt out.
To achieve the above object, sight glass proposed by the present invention, including lens assembly and for encapsulating the lens assembly
The first pipe fitting, the lens assembly is arranged on the end of first pipe fitting, in addition to breather line and is set in described
The second pipe fitting outside first pipe fitting, there is gap, described breather line one end between second pipe fitting and first pipe fitting
For external compressed air, the gap between the other end and second pipe fitting and first pipe fitting connects；Compressed air from
The breather line enters flows through the gap, the lens assembly to the external world successively.
Preferably, the interface being connected in second pipe fitting with the breather line, second pipe fitting and described the
Encapsulation process is carried out between one pipe fitting, between second pipe fitting and the breather line.
Preferably, the gap between second pipe fitting and first pipe fitting is in more than 0.2mm.
Preferably, the sight glass also includes being arranged on handle of first pipe fitting away from described lens assembly one end.
Preferably, the sight glass also includes joint, and the breather line is connected by the joint with the handle, institute
The second pipe fitting is stated to be fastened in the handle to connect with the breather line.
Preferably, the joint is 360 ° of swivel joints.
Preferably, be provided with sealing ring in the handle, the sealing ring be used to seal be located at second pipe fitting with it is described
Gap between first pipe fitting and second pipe fitting of the interface of breather line.
Preferably, regulating valve is provided with the breather line.
Preferably, second pipe fitting is made of exotic material.
Preferably, the sight glass also includes display main frame and the data pipe fitting being connected with the display main frame, described
Handle is connected with the one end of the data pipe fitting away from the display main frame, and the lens assembly is electrically connected with the display main frame
Connect.
Technical solution of the present invention is set by being arranged the second pipe fitting in the first pipe fitting external series gap for being provided with lens assembly
Gap between external breather line and the second pipe fitting and the first pipe fitting connects so that compressed air can be entered from breather line
Enter to flow through the gap, lens assembly to the external world successively, carry out heat with lens assembly while to form high-speed air flow thermal insulation layer
Exchange, realize the function to lens assembly cooling, so as to reach the effect that sight glass is capable of continuous firing at high temperature.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the structural representation of the embodiment of sight glass one of the present invention；
Fig. 2 is the partial enlarged drawing at B in Fig. 1；
Fig. 3 is the partial enlarged drawing at A in Fig. 1；
Fig. 4 is the structural representation of another embodiment of sight glass of the present invention.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 100 | Lens assembly | 200 | First pipe fitting |
| 300 | Second pipe fitting | 400 | Breather line |
| 500 | Handle | 600 | Joint |
| 700 | Sealing ring | 800 | Show main frame |
| 900 | Data pipe fitting |
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in drawings) between each part,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes therewith.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, " first ", " second " etc. are somebody's turn to do
Description be only used for describing purpose, and it is not intended that instruction or implying its relative importance or implicit indicating indicated skill
The quantity of art feature.Thus, " first " is defined, the feature of " second " can be expressed or implicitly includes at least one spy
Sign.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, the knot of this technical scheme is will be understood that when the combination appearance of technical scheme is conflicting or can not realize
Conjunction is not present, also not within the protection domain of application claims.
The present invention proposes a kind of sight glass.
In embodiments of the present invention, as depicted in figs. 1 and 2, the sight glass includes lens assembly 100 and for encapsulating the mirror
First pipe fitting 200 of head assembly 100, the lens assembly 100 are arranged on the end of the first pipe fitting 200；The sight glass also includes logical
Feed channel 400 and the second pipe fitting 300 being set in outside the first pipe fitting 200, between the pipe fitting 200 of the second pipe fitting 300 and first
With gap, the one end of breather line 400 be used for external compressed air, the other end and the second pipe fitting 300 and the first pipe fitting 200 it
Between gap connection；Compressed air enters from breather line 400 flows through the gap, lens assembly 100 to the external world successively.
Lens assembly 100 is mainly used in shooting extraneous working condition, and image and video data are carried out in real time
Passback.Lens assembly 100 is installed on the end of the first pipe fitting 200 so that just can drive lens group by mobile first pipe fitting 200
Part 100 is moved, and required image or video data are photographed to realize to be actually needed according to user.Work as lens assembly
100 in hot environment when working, and persistently accesses compressed air from one end of breather line 400, flows through the first pipe fitting 200 and
Gap between two pipe fittings 300, is flowed at lens assembly 100 always, and the external world is flowed at lens assembly 100 so that constantly
There is compressed air to flow through at lens assembly 100, form a gas flow at high rates layer, it is same with what is be thermally shielded to external high temperature
When, compressed air can also carry out heat exchange between lens assembly 100, be produced so as to which compressed air can take away lens assembly 100
Raw partial heat, and then the effect to cool to lens assembly 100 is realized, work can be continued at high temperature by having reached sight glass
The effect of work.
Due to being mainly that the resistance to heat problem of lens assembly 100 have impact on the high-temperature work environment of sight glass, therefore breather line
400 installation site can constantly flow through lens group depending on actual conditions as long as can ensure the air-flow of compressed air
Part 100 carries out heat exchange, directly can be connected with the second pipe fitting 300 at lens assembly 100 such as breather line 400 or
Also the place with a distance from can having from lens assembly 100 connects with the second pipe fitting 300.
In actual application, the temperature and flow velocity that flow through compressed air at lens assembly 100 can be according to actual feelings
Depending on condition, in order that the cooling-down effect for obtaining lens assembly 100 is more preferable, it is more low better to set the temperature of compressed air, makes
To carry out the heat taken away of heat exchange between lens assembly 100 more, while also can be by the flow rate set of compressed air compared with
Big speed, and the flow velocity due to compressed air is relevant with the pressure of compressed air, the pressure is unsuitable excessive, excessive may to lead to
The pipe fitting 300 of feed channel 400 or second or the first pipe fitting 200 damage, therefore are preferably arranged between 0.6Mpa~0.7Mpa, with energy
Equipment will not be damaged again while enough cooling very well to lens assembly 100.Certainly, the flow velocity of compressed air and the first pipe fitting 200
Gap length between the second pipe fitting 300 also has relation, and gap is unsuitable excessive also unsuitable too small, in the present embodiment, preferably
The gap is in more than 0.2mm.
Technical solution of the present invention in the external series gap of the first pipe fitting 200 for being provided with lens assembly 100 by being arranged the second pipe fitting
300, and set the gap between external breather line 400 and the second pipe fitting 300 and the first pipe fitting 200 to connect so that compression
Air can from breather line 400 enter flow through the gap, lens assembly 100 to the external world successively, with formed high-speed air flow every
Heat exchange is carried out with lens assembly 100 while thermosphere, the function of cooling to lens assembly 100 is realized, is peeped so as to reach
Visor is capable of the effect of continuous firing at high temperature.
Further, the interface being connected in the second pipe fitting 300 with breather line 400, the second pipe fitting 300 and the first pipe fitting
Encapsulation process is carried out between 200, between second pipe fitting 300 and breather line 400.Compressed air is from breather line 400
Enter in the gap between the second pipe fitting 300 and the first pipe fitting 200, by the second pipe fitting 300 and the first pipe fitting 200 with ventilation
The junction of pipeline 400 carries out encapsulation process so that compressed air can only flow out from the opening in the direction of lens assembly 100, prevent
The situation that the other end in compressed air gap between the first pipe fitting 200 and the second pipe fitting 300 is lost in occurs.The encapsulation process
Can be by welding or being bonded or the mode such as peripheral hardware sealing ring is realized.
Further, reference picture 1 and Fig. 3, used more flexibly in order that obtaining sight glass, the sight glass also wraps setting
In handle 500 of first pipe fitting 200 away from the one end of lens assembly 100.The main function of handle 500 is that convenient use person's operation is held
Hold, user directly can operate according to the position movement being actually needed to lens assembly 100.Because lens assembly 100 returns
, it is necessary to carry out the connection of circuit when passing data, and circuit connection typically has circuit or pcb board etc., then can set handle 500
Into the part with inner chamber, pcb board and its structure member are encapsulated in the interior intracavitary of handle 500, circuit etc. is directly encapsulated into
In the first pipe fitting 200 being connected with handle 500, structure space is also saved while easy to use.
Further, joint 600 is also included with continued reference to Fig. 1 and Fig. 3, the sight glass, the breather line 400 is connect by this
First 600 are connected with handle 500, and the second pipe fitting 300 is fixed with being connected in the handle 500 with breather line 400.Second pipe
Part 300 is fastened in handle 500, and handle 500 is connected with the first pipe fitting 200, while by breather line 400 and
The position of two pipe fittings 300 connection is arranged at handle 500 so that assembling is easier, without additional designs breather line 400
Connected mode.The main function of joint 600 is to connect breather line 400 and handle 500, in actual application,
Hand-held handle 500 is needed to go to operate in view of staff, therefore in the present embodiment, preferably joint 600 is 360 ° of swivel joints,
Make it possible to turn to breather line 400 according to the use habit of staff, avoid breather line 400 to handle
500 interference situation.
Further, reference picture 1 and Fig. 3, the handle 500 is interior to be provided with sealing ring 700, and the sealing ring 700 is used for sealing position
Gap between the second pipe fitting 300 and the first pipe fitting 200 and the second pipe fitting 300 of the interface of breather line 400.Sealing ring
700 main functions are to live the first pipe fitting 200 and clearance seal of second pipe fitting 300 in the one end of handle 500, prevent compressed air
Revealed from the end to reduce the situation generation to the cooling-down effect of lens assembly 100.Due to being compressed air in pipeline, therefore seal
Circle 700 needs have certain bearing capacity, preferable metal-rubber sealing ring, polyurethane rubber sealing ring or silicone rubber seal
Circle etc..
Further, in order to which more convenient regulation flows through the compressed air at lens assembly 100, in breather line 400
It is provided with regulating valve (not shown).The regulating valve is mainly used in adjusting the flow velocity or flow of compressed air.
Further, when lens assembly 100 works in high temperature environments, the second pipe fitting 300 is directly empty with external high temperature
What gas was contacted, therefore the material of the second pipe fitting 300 needs to select exotic material when selection, as stainless steel or titanium close
Gold etc..
Further, reference picture 4, the sight glass also include display main frame 800 and the number being connected with the display main frame 800
According to pipe fitting 900, handle 500 is connected with the one end of the data pipe fitting 900 away from display main frame 800, and lens assembly 100 is led with display
Machine 800 electrically connects.The image photographed or video data are passed through the circuit that is arranged in the first pipe fitting 200 by lens assembly 100
Passed to pcb board at the pcb board in handle 500, the component such as pcb board at handle 500 passes through image or video data again
Data pipe fitting 900, which is transferred to, to be analyzed and processed at display main frame 800 and analysis result is showed into user, and user is according to display
Result, hold handle 500 to lens assembly 100 carry out next step operation.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in the scope of patent protection of the present invention.
Claims (10)
1. a kind of sight glass, including lens assembly and the first pipe fitting for encapsulating the lens assembly, the lens assembly are set
Put in the end of first pipe fitting, it is characterised in that also including breather line and be set in outside first pipe fitting
Two pipe fittings, there is gap, it is empty that described breather line one end is used for external compression between second pipe fitting and first pipe fitting
Gas, the gap between the other end and second pipe fitting and first pipe fitting connect；Compressed air is entered from the breather line
Enter to flow through the gap, the lens assembly to the external world successively.
2. sight glass as claimed in claim 1, it is characterised in that connect in second pipe fitting with what the breather line was connected
At mouthful, sealed between second pipe fitting and first pipe fitting, between second pipe fitting and the breather line
Processing.
3. sight glass as claimed in claim 1 or 2, it is characterised in that between second pipe fitting and first pipe fitting
Gap is in more than 0.2mm.
4. sight glass as claimed in claim 1 or 2, it is characterised in that the sight glass also includes being arranged on first pipe
Handle of the part away from described lens assembly one end.
5. sight glass as claimed in claim 4, it is characterised in that the sight glass also includes joint, and the breather line leads to
Cross the joint to be connected with the handle, second pipe fitting is fastened in the handle with the breather line to connect
It is logical.
6. sight glass as claimed in claim 5, it is characterised in that the joint is 360 ° of swivel joints.
7. sight glass as claimed in claim 5, it is characterised in that be provided with sealing ring in the handle, the sealing ring is used for
Sealing is between first pipe fitting and second pipe fitting of second pipe fitting and the interface of the breather line
Gap.
8. sight glass as claimed in claim 1 or 2, it is characterised in that regulating valve is provided with the breather line.
9. sight glass as claimed in claim 1 or 2, it is characterised in that second pipe fitting is made of exotic material.
10. sight glass as claimed in claim 4, it is characterised in that the sight glass also include display main frame and with it is described
The data pipe fitting of main frame connection is shown, the handle is connected with the one end of the data pipe fitting away from the display main frame, described
Lens assembly electrically connects with the display main frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711038132.3A CN107728308A (en) | 2017-10-30 | 2017-10-30 | Sight glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711038132.3A CN107728308A (en) | 2017-10-30 | 2017-10-30 | Sight glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107728308A true CN107728308A (en) | 2018-02-23 |
Family
ID=61202336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711038132.3A Pending CN107728308A (en) | 2017-10-30 | 2017-10-30 | Sight glass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107728308A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116547A (en) * | 2018-09-26 | 2019-01-01 | 深圳市古安泰自动化技术有限公司 | Endoscope |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000046482A (en) * | 1998-07-28 | 2000-02-18 | Nippon Steel Corp | Industrial endoscope with cooling structure |
| DE102006052241A1 (en) * | 2005-11-04 | 2007-05-24 | Technolab Gmbh | Tubular endoscope for technical purposes e.g. for inspection of soldering processes and soldering of electronic elements on printed boards, has coaxially aligned pipes in which optical system is party accommodated |
| JP2008233635A (en) * | 2007-03-22 | 2008-10-02 | Olympus Corp | Cooling device for endoscope and endoscope apparatus |
| CN201352272Y (en) * | 2009-01-19 | 2009-11-25 | 林宇鹏 | Portable minitype video observer |
| JP2010008551A (en) * | 2008-06-25 | 2010-01-14 | Olympus Corp | Endoscope guide tube and endoscope system |
| CN102296327A (en) * | 2010-06-25 | 2011-12-28 | 贵阳铝镁设计研究院有限公司 | Visual detecting method and device in high-temperature melt of aluminum electrolytic bath |
| CN203968227U (en) * | 2014-07-23 | 2014-11-26 | 合肥金星机电科技发展有限公司 | Video camera retractor device |
| CN204129329U (en) * | 2014-10-24 | 2015-01-28 | 上海杰汇炉窑新技术有限公司 | Coke dry quenching furnace endoscope |
| KR20150122849A (en) * | 2014-04-23 | 2015-11-03 | 두산중공업 주식회사 | Industirial endoscope for high temperature atmosphere |
| CN207352278U (en) * | 2017-10-30 | 2018-05-11 | 深圳市古安泰自动化技术有限公司 | Sight glass |
-
2017
- 2017-10-30 CN CN201711038132.3A patent/CN107728308A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000046482A (en) * | 1998-07-28 | 2000-02-18 | Nippon Steel Corp | Industrial endoscope with cooling structure |
| DE102006052241A1 (en) * | 2005-11-04 | 2007-05-24 | Technolab Gmbh | Tubular endoscope for technical purposes e.g. for inspection of soldering processes and soldering of electronic elements on printed boards, has coaxially aligned pipes in which optical system is party accommodated |
| JP2008233635A (en) * | 2007-03-22 | 2008-10-02 | Olympus Corp | Cooling device for endoscope and endoscope apparatus |
| JP2010008551A (en) * | 2008-06-25 | 2010-01-14 | Olympus Corp | Endoscope guide tube and endoscope system |
| CN201352272Y (en) * | 2009-01-19 | 2009-11-25 | 林宇鹏 | Portable minitype video observer |
| CN102296327A (en) * | 2010-06-25 | 2011-12-28 | 贵阳铝镁设计研究院有限公司 | Visual detecting method and device in high-temperature melt of aluminum electrolytic bath |
| KR20150122849A (en) * | 2014-04-23 | 2015-11-03 | 두산중공업 주식회사 | Industirial endoscope for high temperature atmosphere |
| CN203968227U (en) * | 2014-07-23 | 2014-11-26 | 合肥金星机电科技发展有限公司 | Video camera retractor device |
| CN204129329U (en) * | 2014-10-24 | 2015-01-28 | 上海杰汇炉窑新技术有限公司 | Coke dry quenching furnace endoscope |
| CN207352278U (en) * | 2017-10-30 | 2018-05-11 | 深圳市古安泰自动化技术有限公司 | Sight glass |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116547A (en) * | 2018-09-26 | 2019-01-01 | 深圳市古安泰自动化技术有限公司 | Endoscope |
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