CN109623558B - Precision forming method of off-axis aspheric lens - Google Patents
Precision forming method of off-axis aspheric lens Download PDFInfo
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- CN109623558B CN109623558B CN201811471952.6A CN201811471952A CN109623558B CN 109623558 B CN109623558 B CN 109623558B CN 201811471952 A CN201811471952 A CN 201811471952A CN 109623558 B CN109623558 B CN 109623558B
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- lens
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- aspheric lens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention discloses a precise forming method of an off-axis aspheric lens, which comprises the following process flows: coating protective paint on the lens, bonding a rigid clamp, cutting and separating the lens by an inner circle cutting machine, taking down a semicircular lens, precisely milling and grinding an off-axis aspheric lens, bonding another semi-transparent lens, precisely milling and grinding the off-axis aspheric lens and the like. The invention solves the problem of lens rejection caused by inaccurate positioning and easy generation of optical axis deviation and inclination in the process of forming the glass material aspheric lens in process; the invention adopts the precise positioning fixture for bonding, effectively avoids the movement of the lens in the molding process, and solves the problem that the surface precision is easily damaged by scratches generated by the common method. The effects of stable quality, improved efficiency and reduced cost in mass production are realized.
Description
Technical Field
The invention belongs to the technical field of optical part manufacturing, and relates to a precise forming method of an off-axis aspheric lens, which is mainly used for precise forming of a rectangular off-axis double-sided aspheric lens after grinding and polishing.
Background
At present, for the optical processing of the off-axis aspheric lens, the main means is to firstly perform rough grinding, fine grinding and polishing on the lens and finally perform precise molding according to the external dimension.
Under the general condition, the round off-axis aspheric lens can be machined by a centering edging machine, and the edge special-shaped lens needs to be machined by a tool with reasonable design. Because the processed part is a polished double-sided aspheric lens, surface damage is easy to generate in the subsequent forming and processing process; furthermore, the off-axis aspheric surface related by the invention is a rectangular lens with two-direction off-axis, the Y-direction edge of the off-axis lens is only 0.439mm away from the optical axis of the lens, the thickness of the saw blade of the internal circle cutting machine is 0.3mm, and the invention is formed by adopting other methods, so that the invention achievement is not possible to realize, namely, one round aspheric lens takes off two rectangular off-axis aspheric lens.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: the precise forming method of the off-axis aspheric lens is used for precisely forming the rectangular off-axis double-sided aspheric lens and ensuring the position precision and the surface shape quality of the off-axis aspheric lens.
(II) technical scheme
In order to solve the above technical problems, the present invention provides a method for precisely forming an off-axis aspherical lens, comprising the steps of:
the first step is as follows: lens paint protection
Coating protective paint on two surfaces of the ground and polished round aspheric lens, and then pasting a protective adhesive tape on the protective paint surface;
the second step is that: bonding of
Bonding the protected round aspheric lens on a rigid fixture bonding die;
the third step: cutting of
Fixing the bonding die on an inner circle cutting machine for cutting to divide the round aspheric lens into two parts from the middle, and heating and then taking down one of the semi-round aspheric surfaces;
the fourth step: precision milling and grinding machine
Fixing the bonding die with the other semicircular aspheric surface on a workbench of a numerical control machining center, and milling and grinding the semicircular aspheric surface;
the fifth step: lower plate and upper plate
Heating a lower disc of a first off-axis aspheric lens formed by milling and grinding, and simultaneously, feeding the other semicircular aspheric surface of the upper disc;
and a sixth step: precision milling and grinding machine
Repeating the fourth step to finish the milling and grinding of the second off-axis aspheric lens;
the seventh step: examination of
Measuring the external dimension of the off-axis aspheric lens by using a universal tool microscope;
eighth step: package (I)
And packaging the qualified parts with lens paper and then putting the parts into a packaging box.
(III) advantageous effects
In order to ensure that the surface precision of the round aspheric lens which is ground and polished is not damaged in the precision forming process, the precision forming method of the off-axis aspheric lens provided by the technical scheme more importantly ensures that the formed off-axis aspheric lens strictly meets the technical requirements of drawings, namely the optical axis of the off-axis aspheric lens is overlapped with the optical axis of the round aspheric lens of the parent body of the off-axis aspheric lens and the inclination of the off-axis aspheric lens is within the tolerance of the requirements of the drawings. The invention designs a rigid clamp for accurate positioning and bonding; cutting and separating by an inner circle cutting machine; precise milling and grinding are carried out on numerical control machining equipment, and finally a round aspheric lens is finished to obtain the best result of two square off-axis aspheric lenses; the invention solves the problem of lens rejection caused by inaccurate positioning and easy generation of optical axis deviation and inclination in the process of forming the glass material aspheric lens in process; the invention adopts the precise positioning fixture for bonding, effectively avoids the movement of the lens in the molding process, and solves the problem that the surface precision is easily damaged by scratches generated by the common method. The effects of stable quality, improved efficiency and reduced cost in mass production are realized.
Drawings
FIG. 1 is a process flow diagram, which is a main technical scheme block diagram of the invention.
Fig. 2 is an illustration of an off-axis aspheric lens. Wherein, I is a perspective view, II is a front view, and III is a side view.
FIG. 3 is a combined view of off-axis aspheric lens bonding and cutting.
FIG. 4 is a schematic diagram of off-axis aspheric surface project shaping.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
For the precise forming of the rectangular off-axis double-sided aspheric lens, a rigid fixture is adopted for precise positioning and bonding, an inner circle cutting machine is used for cutting and separating, and then numerical control processing equipment is used for precise milling and grinding with a diamond fixed abrasive grinding tool, and finally the result that one round aspheric lens obtains two square off-axis aspheric lenses is finished.
Specifically, referring to fig. 1, the method for precisely forming the off-axis aspheric lens of the present invention includes the following steps:
the first step is as follows: lens paint protection
Coating protective paint on two surfaces of the ground and polished round aspheric lens, and then pasting a protective adhesive tape on the protective paint surface;
the required equipment is as follows: a work bench.
The second step is that: bonding of
And adhering the protected round aspheric lens on a rigid fixture adhering mold.
The bonding die is cylindrical, and the top curved surface is matched with the concave surface of the round aspheric lens.
Referring to fig. 3, a positioning sleeve ring is sleeved on the periphery of the bonding die, and protrudes out of the periphery of the bonding die, so that accurate concentric positioning of the round aspheric lens on the bonding die is ensured.
The required equipment is as follows: electric hot plate, workstation.
The third step: cutting of
And fixing the bonding die on an inner circle cutting machine for cutting to divide the round aspheric lens into two parts from the middle, and heating and then taking down one of the semi-round aspheric lenses.
Referring to fig. 3, the center of the spherical surface of the bonding die is provided with a cutting function groove with a width of 1mm, so that the cutting saw blade can pass through the center of the metal bonding die without interference.
The required equipment is as follows: an inner circle cutting machine.
The fourth step: precision milling and grinding machine
And fixing the bonding die with the other semicircular aspheric surface on a workbench of a numerical control machining center, and milling and grinding the semicircular aspheric surface.
Referring to fig. 4, a milling functional groove is pre-processed at the off-axis position of the bonding die relative to the off-axis aspheric lens, so that the diamond fixed abrasive tool does not contact with the metal bonding die in the milling process.
The required equipment is as follows: numerical control processing equipment.
The fifth step: lower plate and upper plate
Heating a lower disc of a first off-axis aspheric lens formed by milling and grinding, and simultaneously, feeding the other semicircular aspheric surface of the upper disc;
referring to fig. 4, the semicircular aspheric surface is required to cover the milling functional groove during the disc loading.
The required equipment is as follows: electric hot plate, workstation.
And a sixth step: precision milling and grinding machine
Repeating the fourth step to finish the milling and grinding of the second off-axis aspheric lens;
the required equipment is as follows: numerical control processing equipment.
The seventh step: examination of
Measuring the external dimension of the off-axis aspheric lens by using a universal tool microscope;
eighth step: package (I)
And packaging the qualified parts with lens paper and then putting the parts into a packaging box.
The required equipment is as follows: a work bench.
The invention designs a rigid clamp for accurately positioning and bonding the lens, cutting the center of an inner circle cutting machine and accurately milling and grinding a numerical control machining center, and finishes the result that one round aspheric lens obtains two square off-axis aspheric lenses. The requirements of the off-axis lens on the precision of optical axis deviation and the overall dimension are met, and the polishing grade of the surface precision of the lens is also met. And good economic and technical benefits are obtained.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A precise forming method of an off-axis aspheric lens is characterized by comprising the following steps:
the first step is as follows: lens paint protection
Coating protective paint on two surfaces of the ground and polished round aspheric lens, and then pasting a protective adhesive tape on the protective paint surface;
the second step is that: bonding of
Bonding the protected round aspheric lens on a rigid fixture bonding die;
the third step: cutting of
Fixing the bonding die on an inner circle cutting machine for cutting to divide the round aspheric lens into two parts from the middle, and heating and then taking down one of the semi-round aspheric surfaces;
the fourth step: precision milling and grinding machine
Fixing the bonding die with the other semicircular aspheric surface on a workbench of a numerical control machining center, and milling and grinding the semicircular aspheric surface;
the fifth step: lower plate and upper plate
Heating a lower disc of a first off-axis aspheric lens formed by milling and grinding, and simultaneously, feeding the other semicircular aspheric surface of the upper disc;
and a sixth step: precision milling and grinding machine
Repeating the fourth step to finish the milling and grinding of the second off-axis aspheric lens;
the seventh step: examination of
Measuring the external dimension of the off-axis aspheric lens by using a universal tool microscope;
eighth step: package (I)
And packaging the qualified parts with lens paper and then putting the parts into a packaging box.
2. The method of claim 1, wherein in the second step, the bonding mold is cylindrical and the top curved surface is matched to the concave surface of the aspheric lens.
3. The method for precisely forming an off-axis aspheric lens as claimed in claim 2, wherein in the second step, a positioning collar is fitted around the periphery of the bonding mold, the positioning collar protruding out of the periphery of the bonding mold to ensure concentric positioning of the round aspheric lens on the bonding mold.
4. The method for precisely forming an off-axis aspherical lens as defined in claim 3, wherein in the third step, a cutting groove having a width of 1mm is formed in the center of the spherical surface of the cemented mold.
5. The method for precisely forming an off-axis aspherical lens as defined in claim 4, wherein in the fourth step, the bonding mold is pre-machined with a milling groove at an off-axis position with respect to the off-axis aspherical lens.
6. A method for precision molding of off-axis aspheric lenses as claimed in claim 5, characterized in that the lens painting protection in the first step is performed on a bench.
7. The method of claim 6, wherein the second step is performed on a platen, which also requires a hot plate.
8. The method of claim 7, wherein the fifth operation is performed on a platen and requires a hot plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811471952.6A CN109623558B (en) | 2018-12-04 | 2018-12-04 | Precision forming method of off-axis aspheric lens |
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| CN201811471952.6A CN109623558B (en) | 2018-12-04 | 2018-12-04 | Precision forming method of off-axis aspheric lens |
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| CN109623558A CN109623558A (en) | 2019-04-16 |
| CN109623558B true CN109623558B (en) | 2020-04-24 |
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| CN111002493B (en) * | 2019-11-26 | 2022-03-29 | 天津津航技术物理研究所 | Diamond turning method for large-caliber germanium single crystal lens |
| CN112157497B (en) * | 2020-09-24 | 2022-06-10 | 天津津航技术物理研究所 | Precision grinding and polishing method for inner hole of large-diameter glass cylindrical window |
| CN116442055B (en) * | 2023-04-07 | 2024-01-30 | 北京创思工贸有限公司 | Wedge lens processing method |
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| IT1281259B1 (en) * | 1995-04-27 | 1998-02-17 | Armando Rattaro | PIECE HOLDER DEVICE, IN PARTICULAR FOR FIXING GLASSES LENSES |
| JP2008194771A (en) * | 2007-02-09 | 2008-08-28 | Kyoritsu Seiki Kk | Method and device for grinding lens sphere |
| JP2009166136A (en) * | 2008-01-10 | 2009-07-30 | Nano-Optonics Research Institute | Grinding device to manufacture optical element, manufacturing method of optical element and precision measuring device for precisely measuring shape/dimension of metallic mold to manufacture optical element or optical element |
| CN102229082B (en) * | 2011-06-03 | 2013-01-16 | 中国兵器工业第二〇五研究所 | Manufacturing method of wedge-shaped lens |
| WO2016083129A1 (en) * | 2014-11-27 | 2016-06-02 | SAFILO SOCIETÀ AZIONARIA FABBRICA ITALIANA LAVORAZIONE OCCHIALI S.p.A. | Method of manufacturing a lens for spectacles, lens so produced and spectacles including this lens |
| CN105643396B (en) * | 2016-01-29 | 2018-05-08 | 中国科学院上海光学精密机械研究所 | The grinding and milling processing method of large-scale bore off-axis aspheric surface lens |
| CN105710747A (en) * | 2016-05-04 | 2016-06-29 | 长春博信光电子有限公司 | Processing method of micro cylindrical mirror |
| CN107188401B (en) * | 2017-05-17 | 2019-12-20 | 莱特巴斯光学仪器（镇江）有限公司 | Processing tool and processing method for non-right-angle special-shaped lens |
| CN109366291A (en) * | 2018-11-23 | 2019-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of high-precision processing method of Schmidt prism |
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