CN107021612B - Device and method for manufacturing ultra-fine diameter endoscope objective lens - Google Patents
Device and method for manufacturing ultra-fine diameter endoscope objective lens Download PDFInfo
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- CN107021612B CN107021612B CN201710419507.4A CN201710419507A CN107021612B CN 107021612 B CN107021612 B CN 107021612B CN 201710419507 A CN201710419507 A CN 201710419507A CN 107021612 B CN107021612 B CN 107021612B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/04—Re-forming tubes or rods
- C03B23/047—Re-forming tubes or rods by drawing
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B13/00—Rolling molten glass, i.e. where the molten glass is shaped by rolling
- C03B13/01—Rolling profiled glass articles, e.g. with I, L, T cross-sectional profiles
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/06—Cutting or splitting glass tubes, rods, or hollow products
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Endoscopes (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
- Lenses (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention relates to a manufacturing device and a manufacturing method of an objective lens for an ultra-fine diameter endoscope, comprising a tube furnace, a traction device and a cutting device which are coaxially arranged on a frame in sequence from left to right; the method comprises the following steps: 1) Cutting the glass gob into a long gob; 2) Processing into a thick-diameter glass rod by a rounding machine, and grinding and polishing; 3) Conveying the thick-diameter glass rod into a vacuum dustproof tubular furnace through a precise speed regulating motor, and heating and softening the thick-diameter glass rod; 4) Drawing the heated and softened coarse-diameter glass rod through a drawing device to obtain a superfine-diameter glass rod; 5) Grinding and polishing, and carrying out rotary cutting and optical cold working by a motor with a resin cutter. The invention is not easy to break when processing the lens with the diameter smaller than 0.7mm, has low rejection rate and small diameter tolerance, is easy to meet the requirements of customers, and has the characteristics of low production cost, high efficiency and the like.
Description
Technical Field
The invention belongs to the field of manufacturing of optical lenses, and particularly relates to a manufacturing device and a manufacturing method of an objective lens for an ultra-fine diameter endoscope.
Background
The development of endoscopes has been over 200 years old, and the development of endoscopes makes non-abradable contributions to the fields of medical minimally invasive, industrial nondestructive detection, public inspection trace identification and the like. Endoscopes have undergone the development stages of hard endoscopes, fiber endoscopes, electronic endoscopes and capsule endoscopes, and since 1999 ultra-fine diameter endoscopes were assembled into markets by using quartz image fibers (image fibers) and self-focusing lenses (Fujikura ltd.) of the germany platinum company (Polydiagnost gmbh), but since the self-focusing lenses can only image objects with a certain working distance, i.e., objects without depth of field, and have great chromatic aberration, no acceptance in the application field has been obtained, the ultra-fine diameter endoscopes have not actually entered into markets until 2010 with the appearance of a depth of field objective system, and have been accepted by users, but diameters of less than 0.7mm and tolerances satisfying + -0.01 mm lens manufacturing have been difficult until now.
It is known that an ultra-fine diameter endoscope has wide application prospect in the fields of medical minimally invasive/noninvasive, industrial precise nondestructive detection, trace identification of public inspection system and the like, and the national key research and development plan of China: the technical improvement of basic materials and the declaration guide of the industrial key special project 2016 are listed in the development direction of the ultra-fine diameter endoscope, and obviously the difficult problem of manufacturing the ultra-fine diameter lens cannot be avoided. Now, companies working in China or making ultra-fine diameter endoscopes in the future need to entrust swiss, germany, united states, japan and other developed countries with diameters less than 0.7mm and tolerances satisfying + -0.01 mm to manufacture, will lose proprietary intellectual property rights and be restricted by people, and the manufacturing method in developed countries is not a decade.
There are two general methods for manufacturing ultra-fine diameter lenses in the world: 1 is to manufacture pellets first, then edging and then cutting, and then optical cold working, as shown in fig. 1;2 is to process a thin diameter glass rod by a centerless grinder, cut the glass rod and then perform optical cold working, and fig. 2 is a process flow thereof. The two methods are easy to crack when the lens with the diameter smaller than 0.7mm is processed, the rejection rate is extremely high, and the diameter tolerance is difficult to meet the requirements.
U.S. patent 7116486, 7715105 teaches a method of making lenses having diameters less than 1mm by first machining slightly larger diameter cylindrical rods, such as 1.7mm to 2mm, placing them in a support groove, approximating the rods several times by sawing to ultra-fine diameter cylindrical rods, and cutting and then performing optical cold working. This method is very labor-and time-consuming and costly.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a manufacturing device and a manufacturing method for manufacturing an objective lens for an ultra-fine diameter endoscope, wherein the diameter of the objective lens is smaller than 0.7 mm.
The technical scheme for realizing the aim of the invention is as follows: the device for manufacturing the objective lens for the superfine diameter endoscope comprises a vacuum dustproof tubular furnace, a traction device and a cutting device which are coaxially arranged on a frame in sequence from left to right; the tubular furnace comprises a heating zone, a softening zone and an annealing zone which are connected in sequence, and the inner chamber is provided with electric furnace wires through a spacing distance; the working length of the heating area is 3cm, the temperature of the heating area is gradually increased from the heating inlet to the heating outlet, and the temperature difference between the heating inlet and the heating outlet is 100 ℃; the working length of the softening area is less than 3cm; the temperature of the softening area is matched with the temperature of the softening point of the glass; the working length of the annealing zone is more than or equal to 10cm, the temperature of the annealing zone is gradually reduced from an annealing inlet to an annealing outlet, and the temperature difference between the annealing inlet and the annealing outlet is 100 ℃; the traction device is double-manipulator alternate clamping traction or caterpillar clamping traction; the cutting device comprises a resin cutting sheet which is driven by a motor to rotationally cut.
The double mechanical hand wheel clamping traction device comprises a clamping hand, a speed regulating motor, a screw rod and a fixed frame; the fixed frame is fixedly arranged at the outlet end of the tube furnace; the two lead screws are symmetrically arranged on two sides of the fixed frame by taking the superfine diameter glass rod as a central symmetry axis, and one end of each lead screw is respectively connected with a rotating shaft of the corresponding speed regulating motor; the clamping hands are two pneumatic clamping hands, one clamping hand is connected to the left end of one screw rod through a corresponding connecting piece in a threaded manner, the other clamping hand is connected to the right end of the other screw rod through a corresponding connecting piece in a threaded manner, and pneumatic clamping chucks of the two clamping hands are arranged at positions corresponding to the superfine diameter glass rods.
The crawler clamping traction comprises a driving traction crawler and a driven traction crawler which are arranged in parallel; the superfine diameter glass rod is clamped between the driving traction crawler belt and the driven traction crawler belt; the active traction track is rotated by a motor to conduct linear traction.
According to the technical scheme, the vacuum pressure of the tube furnace is between 0.01 and 4MPa, the inner chamber of the tube furnace is a corundum tube, a temperature control instrument and a speed control instrument are arranged on the outer wall of the tube furnace, and a glass observation window is arranged on one surface of the furnace wall of the tube furnace.
A method for manufacturing an objective lens for an ultra-fine diameter endoscope comprises the following steps:
1) Cutting the glass gob into a long gob;
2) Processing into a thick-diameter glass rod with the diameter of 4-20 mm by a rounding machine, and grinding and polishing;
3) Conveying the thick-diameter glass rod into a vacuum dustproof tubular furnace through a precise speed regulating motor, and heating and softening the thick-diameter glass rod;
4) Drawing the heated and softened coarse-diameter glass rod through a drawing device to obtain a superfine-diameter glass rod;
5) Grinding, polishing, cutting and optical cold working.
In the step 4), two manipulators draw the superfine diameter glass rod outside the tube furnace along the guide rail in a rotating way, and the manipulator drawn to the terminal cuts off the superfine diameter glass rod and simultaneously the front manipulator clamps the superfine diameter glass rod and starts drawing.
In the step 4) of the above technical solution, the ultra-fine diameter glass rod is clamped between the driving traction crawler and the driven traction crawler, and the driving traction crawler performs linear traction under the rotation of the motor.
In the above technical solution, the traction speed is set to V2, v2=v1× (ɸ/d) 2 Wherein ɸ is the diameter of a large diameter glass rod and d is the diameter of an ultra-fine diameter glass rod.
In the step 3) according to the technical scheme, the speed of the precision speed regulating motor is set to be V1, the range of V1 is 0.5-2 mm/min, and the precision requirement is +/-0.05 mm/min.
In the step 5), the motor is used to drive the resin cutting sheet to rotate for cutting, and the rotation speed ω=l/V2 of the motor is used for cutting the superfine diameter glass rod, wherein L is the length of the cut, and V2 is the traction speed.
After the technical scheme is adopted, the invention has the following positive effects:
(1) The invention processes the glass into the glass rod with the thick diameter through the rounding machine, the glass rod with the thick diameter is sent into the tube furnace to be heated and softened, and the glass rod with the ultra-fine diameter is manufactured through traction, so that the glass rod is not easy to break when the lens with the diameter smaller than 0.7mm is processed, the rejection rate is low, the diameter tolerance is small, the requirements of customers are easily met, and the invention has the characteristics of low production cost, high efficiency and the like.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which
Fig. 1 shows a process flow of the pellet fabrication process for ultra-fine diameter lenses.
Figure 2 shows the centerless grinder process flow for manufacturing ultra-fine diameter lenses.
Fig. 3 illustrates a method of manufacturing an approximated ultra-fine diameter glass rod by multiple sawing.
Figure 4 shows a flow chart of the manufacture of an ultra-fine diameter lens of the present invention.
FIG. 5 shows a schematic diagram of a drawing and forming device of a superfine diameter glass rod manipulator of the invention.
FIG. 6 shows a temperature profile of a tube furnace-formed optical glass H-K9L of an example.
Fig. 7 shows a schematic structural diagram of a dual mechanical hand wheel change grip traction device.
FIG. 8 shows a temperature profile of an example two-tube furnace formed optical glass H-K9L.
FIG. 9 shows a schematic view of an ultra-fine diameter glass rod crawler forming apparatus.
Fig. 10 shows a schematic diagram of a track-gripping traction structure.
Fig. 11 shows a schematic of the connection of the active traction tracks to the motor, frame.
FIG. 12 shows a temperature profile of an example three-tube furnace-formed optical glass H-K9L.
FIG. 13 shows a temperature profile of the optical glass H-F4 formed by the four-tube furnace of the example.
The reference numerals in the drawings are: the device comprises a coarse-diameter glass rod 1, a tube furnace 2, a double-mechanical hand wheel changing clamping traction 3, a clamping hand 3.1, a connecting piece 3.2, a lead screw 3.3, a speed regulating motor 3.4, a fixed frame 3.5, a cutting machine 4, an ultrafine-diameter glass rod 5, a caterpillar clamping traction 6, a driving traction caterpillar 6.1, a driven traction caterpillar 6.2, a frame 6.3 and a motor 6.4.
Detailed Description
The invention relates to a manufacturing device of an objective lens for an ultra-fine diameter endoscope, which comprises a tube furnace 2, a traction device and a cutting device, wherein the tube furnace 2, the traction device and the cutting device are coaxially arranged on a frame 6.3 in sequence from left to right; the tube furnace 2 comprises a heating zone, a softening zone and an annealing zone which are connected in sequence, and the inner chamber is provided with electric furnace wires through a spacing distance; the working length of the heating area is 3cm, the temperature of the heating area is gradually increased from the heating inlet to the heating outlet, and the temperature difference between the heating inlet and the heating outlet is 100 ℃; the working length of the softening area is less than 3cm; the temperature of the softening area is matched with the temperature of the softening point of the glass; the working length of the annealing zone is more than or equal to 10cm, the temperature of the annealing zone is gradually reduced from an annealing inlet to an annealing outlet, and the temperature difference between the annealing inlet and the annealing outlet is 100 ℃; the traction device is double mechanical arms for alternately clamping and traction 3 or caterpillar clamping and traction; the cutting device comprises a resin cutting sheet which is driven to rotationally cut by a motor 6.4.
The double mechanical hand wheel changing clamping traction 3 comprises a clamping hand 3.1, a speed regulating motor, a screw rod 3.3 and a fixed frame 3.5; the fixed frame 3.5 is fixedly arranged at the outlet end of the tube furnace 2; the two lead screws 3.3 are symmetrically arranged on the two sides of the fixed frame 3.5 by taking the superfine diameter glass rod as a central symmetry axis, and one end of each lead screw 3.3 is respectively connected with the rotating shaft of the corresponding speed regulating motor; the clamping hands 3.1 are two pneumatic clamping hands 3.1, one clamping hand 3.1 is connected to the left end of one screw rod 3.3 through corresponding connecting piece 3.2 in a threaded manner, the other clamping hand 3.1 is connected to the right end of the other screw rod 3.3 through corresponding connecting piece 3.2 in a threaded manner, and pneumatic clamping chucks of the two clamping hands 3.1 are arranged corresponding to the positions of the superfine diameter glass rods.
The caterpillar clamping traction comprises a driving traction caterpillar 6.1 and a driven traction caterpillar 6.2 which are arranged in parallel; the superfine diameter glass rod is clamped between the driving traction crawler belt 6.1 and the driven traction crawler belt 6.2; the active traction track is rotated by a motor to carry out linear traction.
The vacuum pressure of the tube furnace 2 is between 0.01 and 4MPa, the inner chamber of the tube furnace 2 is a corundum tube, a temperature control instrument and a speed control instrument are arranged on the outer wall of the tube furnace 2, and a glass observation window is arranged on one surface of the furnace wall of the tube furnace 2.
As shown in FIG. 4, the manufacturing process of the invention is to cut the optical glass H-K9L into strips of (10.5X10.5) x 300, roll out the thick diameter glass rod 1 of ɸ X300 by a rounding machine, grind and polish, wipe with pure alcohol for standby by using white silk cloth to be dipped and analyzed; the optical glass H-F4 was cut into (16.5X16.5). Times.300 strips, and rolled out by a spheronizer to obtain a ɸ 16.16X10 thick-diameter glass rod 1.
Example 1
As shown in FIG. 5, ɸ X300H-K9L thick diameter glass rod 1 was fed into the tube furnace 2 at a rod feeding speed of 1.5 mm.+ -. 0.05 mm/min. The inner bore of the tube furnace 2 is a corundum tube, the inner diameter is 20mm, the length is 210mm, a heating area, a softening area and an annealing area are arranged by spacing the electric furnace wires, the temperature curve is shown in figure 6 by measuring the temperature of points at intervals of 10mm, the ordinate represents the temperature (unit ℃), the softening forming temperature is about 850 ℃, the abscissa represents the length of a hearth (unit cm), the working length of the heating area is 25-30 mm, the working length of the softening area is about 30mm, and the working length of the annealing area is 150mm. The traction device is a double-mechanical hand wheel clamping traction device 3, the traction speed is 930 mm/min, fig. 7 is a structural illustration of the double-mechanical hand wheel clamping traction device 3, the clamping hand 3.1 clamps the superfine diameter glass rod 5 under the pneumatic action, namely when the pneumatic clamping chuck is inflated, the superfine diameter glass rod 5 is loosened when the pneumatic clamping chuck is stopped, the clamping hand is connected to the screw rod 3.3 through the connecting piece 3.2 in a threaded manner, the clamping hand 3.1 and the clamping hand 3.1 do reciprocating linear motion along the screw rod 3.3 through the speed regulating motor 3.4, and the clamping hand 3.5 is a fixed frame of the traction device. The cutter 44 is rotated by a motor with a resin cutter at a rotational speed ω=0.3 revolutions per minute, and the resin cut sheet has a thickness of 0.5mm and an outer diameter of 100mm. The device is arranged in a cavity made of stainless steel plates, a glass window is arranged on the side face of the cavity, temperature control instruments, speed control instruments and the like are arranged outside the cavity, the cavity is vacuumized by a vacuum pump, and the vacuum pressure is set to be 0.06MPa.
The formed superfine diameter glass rod is 0.4 (0/-0.008) mm, and the precision meets the requirement.
Example 2
The apparatus of FIG. 5, i.e., tube furnace 2, drawing apparatus and vacuum pressure were used to feed ɸ X300H-K9L of large diameter glass rod 1 into tube furnace 2 at a rod feed speed of 1.2 mm.+ -. 0.05 mm/min, drawing speed of 750 mm/min and cutting speed ω=0.4 rpm. As shown in fig. 8, the molding temperature of the tube furnace 2 was lowered by 30 ℃ on average.
The formed superfine diameter glass rod 5 is 0.4 plus or minus 0.005mm, and the precision meets the requirement.
Example 3
As shown in FIG. 9, ɸ X300H-K9L thick diameter glass rod 1 was fed into the tube furnace 2 at a rod feeding speed of 1.5 mm.+ -. 0.05 mm/min. The traction device is a caterpillar clamping traction 6, the traction speed is set to be 460 mm/min, fig. 10 and 11 are the structural principle of the caterpillar clamping traction 6, the caterpillar is divided into a driving traction caterpillar 6.16.1 and a driven traction caterpillar 6.26.2, the ultra-fine diameter glass rod 5 is clamped by the driving traction caterpillar 6.16.1 and the driven traction caterpillar 6.26.2, the driving traction caterpillar 6.16.1 performs linear traction under the rotation of a motor 6.4, and the device is fixed on a frame 6.3. Cutting speed ω=0.6 rpm, vacuum pressure was set at 0.06MPa as shown in fig. 9, and the forming temperature of the tube furnace 2 was lowered by 10 ℃ on average from that of example 2 as shown in fig. 12.
The formed superfine diameter glass rod 5 is 0.6 plus or minus 0.01mm, and the precision meets the requirement.
Example 4
With the apparatus of fig. 9, ɸ 16 ×300H-F4 caterpillar clamp traction is carried into the tube furnace 2, the rod feeding speed is set to 1.2mm±0.05 mm/min, the traction speed is 850 mm/min, and the cutting rotation speed ω=0.33 rpm, as shown in fig. 13, the forming temperature of the tube furnace is much higher than H-K9L, which indicates that the forming temperature of different glass materials is changed.
The formed superfine diameter glass rod 5 is 0.6 plus or minus 0.01mm, and the precision meets the requirement.
In examples 1 to 4, the time from the start of the temperature rise in the furnace to the end of the formation of the ultra-fine diameter glass rod 5 was not substantially longer than 8 hours, and the production amount per time was more than 1 ten thousand lenses, and the production method was efficient and low in cost, and was particularly suitable for mass production. The tolerance of the formed superfine diameter glass rod 5 is less than or equal to +/-0.01 mm.
In embodiments 1-4, the device may be placed horizontally or vertically. If the annealing zone temperature of the tube furnace is difficult to control after transverse arrangement, a condensing tube can be arranged outside the corundum tube, and the length of the annealing zone is as long as possible and is at least more than or equal to 10cm; if the device is vertically arranged, the temperature of the annealing zone is easy to control, but the temperature of the heating zone needs to be controlled by adding a condensing tube.
Examples 1 to 4, in which the diameter of the thick glass rod is not described much, can be increased if the batch size is large, but the forming temperature is increased; the batch size is small, the diameter is properly reduced, but the straightness is relatively poor when the diameter is too small, and the length can be shortened.
Note that the forming temperature of the tube furnace is as low as possible, preventing excessive temperatures from altering the glass properties.
The rod feeding, the tube furnace, the traction device, the cutting and the like have various structural changes, and the coverage of the invention is realized.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (10)
1. An apparatus for manufacturing an objective lens for an ultra-fine diameter endoscope, comprising: comprises a vacuum dust-proof tubular furnace, a traction device and a cutting device which are coaxially arranged on a frame in sequence from left to right; the tubular furnace comprises a heating zone, a softening zone and an annealing zone which are connected in sequence, and the inner chamber is provided with electric furnace wires through a spacing distance; the working length of the heating area is 3cm, the temperature of the heating area is gradually increased from the heating inlet to the heating outlet, and the temperature difference between the heating inlet and the heating outlet is 100 ℃; the working length of the softening area is less than 3cm; the temperature of the softening area is matched with the temperature of the softening point of the glass; the working length of the annealing zone is more than or equal to 10cm, the temperature of the annealing zone is gradually reduced from an annealing inlet to an annealing outlet, and the temperature difference between the annealing inlet and the annealing outlet is 100 ℃; the traction device is double-manipulator alternate clamping traction or caterpillar clamping traction; the cutting device comprises a resin cutting sheet which is driven by a motor to rotationally cut; the vacuum pressure of the tube furnace is between 0.01 and 4MPa.
2. The apparatus for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 1, wherein: the double mechanical hand wheel clamping traction comprises a clamping hand, a speed regulating motor, a screw rod and a fixed frame; the fixed frame is fixedly arranged at the outlet end of the tube furnace; the two lead screws are symmetrically arranged on two sides of the fixed frame by taking the superfine diameter glass rod as a central symmetry axis, and one end of each lead screw is respectively connected with a rotating shaft of the corresponding speed regulating motor; the clamping hands are two pneumatic clamping hands, one clamping hand is connected to the left end of one screw rod through a corresponding connecting piece in a threaded manner, the other clamping hand is connected to the right end of the other screw rod through a corresponding connecting piece in a threaded manner, and pneumatic clamping chucks of the two clamping hands are arranged at positions corresponding to the superfine diameter glass rods.
3. The apparatus for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 1, wherein: the caterpillar clamping traction comprises a driving traction caterpillar and a driven traction caterpillar which are arranged in parallel; the superfine diameter glass rod is clamped between the driving traction crawler belt and the driven traction crawler belt; the active traction track is rotated by a motor to conduct linear traction.
4. The apparatus for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 1, wherein: the inner chamber of the tube furnace is a corundum tube, a temperature control instrument and a speed control instrument are arranged on the outer wall of the tube furnace, and a glass observation window is arranged on one surface of the furnace wall of the tube furnace.
5. A method for manufacturing an objective lens for an ultra-fine diameter endoscope, comprising the steps of:
1) Cutting the glass gob into a long gob;
2) Processing into a thick-diameter glass rod with the diameter of 4-20 mm by a rounding machine, and grinding and polishing;
3) Conveying the thick-diameter glass rod into a vacuum dustproof tubular furnace through a precise speed regulating motor, and heating and softening the thick-diameter glass rod;
4) Drawing the heated and softened coarse-diameter glass rod through a drawing device to obtain a superfine-diameter glass rod;
5) Grinding, polishing, cutting and optical cold working.
6. The method for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 5, wherein: in the step 4), two manipulators pull the superfine diameter glass rod outside the tube furnace along the guide rail in a rotating way, and the manipulator pulled to the terminal cuts off the superfine diameter glass rod and simultaneously the front manipulator clamps the superfine diameter glass rod and starts to pull.
7. The method for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 5, wherein: in the step 4), the superfine diameter glass rod is clamped between the driving traction crawler belt and the driven traction crawler belt, and the driving traction crawler belt performs linear traction under the rotation of a motor.
8. The method for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 6 or 7, wherein: the pulling speed was set to V2, v2=v1× (ɸ/d) 2, where ɸ is the diameter of the large diameter glass rod and d is the diameter of the ultra-fine diameter glass rod.
9. The method for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 8, wherein: in the step 3), the speed of the precision speed-regulating motor is set to be V1, the range of V1 is 0.5-2 mm/min, and the precision requirement is +/-0.05 mm/min.
10. The method for manufacturing an objective lens for an ultra-fine diameter endoscope according to claim 9, wherein: in the step 5), a motor is adopted to drive the resin cutting sheet to rotate for cutting, and the rotating speed omega=L/V2 of the motor is adopted, wherein L is the length of the cut, and V2 is the traction speed.
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| JP2014152077A (en) * | 2013-02-08 | 2014-08-25 | Shin Etsu Chem Co Ltd | Heating furnace for drawing optical fiber preform |
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