CN102490103B - Meniscus lens and processing method therefor - Google Patents

Meniscus lens and processing method therefor Download PDF

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Publication number
CN102490103B
CN102490103B CN201110424857.2A CN201110424857A CN102490103B CN 102490103 B CN102490103 B CN 102490103B CN 201110424857 A CN201110424857 A CN 201110424857A CN 102490103 B CN102490103 B CN 102490103B
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plane
meniscus lens
predetermined surface
edging
processing
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CN102490103A (en
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柳周镐
李燕
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BEIJING TRANS MANUFACTURE AND TRADE Co Ltd
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BEIJING TRANS MANUFACTURE AND TRADE Co Ltd
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  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

The invention provides a meniscus lens and a processing method therefor. The processing method comprises the following steps: a) preparing a cylindrical optical glass blank; b) processing one side of the blank into a plane; c) processing the other side, opposite to the plane, of the blank into a first set plane through taking the plane as the standard, and conducting the first-time centering and edging through taking the first set plane or the plane; d) processing the plane into a second set plane through taking the first set plane as the standard; and e) conducting a second centering and edging through taking the first set plane or the second set plane as the standard. According to the processing method of the meniscus lens, the center aberration of the meniscus lens can be reduced, and the edge thickness difference Delta is controlled within the range less than 0.05.

Description

A kind of meniscus lens and processing method thereof
Technical field
The invention belongs to optics cold processing technique, particularly a kind of optics common component---meniscus lens and processing method thereof.
Background technology
In optical instrument, conventional meniscus lens manufacture method is all to select satisfactory optical glass material, completes, finally only through the edging of once feeling relieved by conventional optical glass cold machining process such as blanking, corase grind, fine grinding, polishings.But for the meniscus lens of nearly concentric circles or nearly same radius (or similar specification), due to its concerning the requirement of centre deviation than very high other meniscus lens, should not be by the above-mentioned conventional method edging of feeling relieved.The meniscus lens that conventional method processes, the thick difference in its limit is difficult to meet design requirement.
And, in the time of the meniscus lens processing platform face of the nearly concentric circles to table top or nearly same radius (or similar specification), shown in for example accompanying drawing 8 (a) of conventional method～(d), first to make two spheres (to have represented first to form convex surface herein and form again the situation of concave surface, but this order is not what limit), recentering cylindrical grinding finally cuts out flat surface on same axle.In the time that flat surface width is larger, conventional method is difficult to guarantee that concave surface geometric center overlaps with part outer geometric center, and the perpendicularity of flat surface and cylindrical is also difficult to guarantee.The meniscus lens processing like this, the perpendicularity of the thick difference in limit and flat surface and cylindrical is difficult to meet the requirement of design.
In patent documentation CN 101791774A, a kind of processing method of negative crescent optical lens is disclosed, just coil take the processing mold that adopted as the vacation of not establishing counterbore, work piece periphery is nonflexible line with the spherical female/convex surface of mould and contacts as principal character, but does not solve the problems referred to above that prior art exists.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of high-precision meniscus lens and processing method thereof are provided.The present invention can process for the high meniscus lens of the thick poor precision prescribed degree in limit, for example, require the meniscus lens of the thick poor Δ t < 0.05mm in limit, particularly the meniscus lens of nearly concentric circles or nearly same radius (or similar specification).
The present invention adopts the method for carrying out twice centering edging to achieve the above object, and processing method comprises the steps: a) to prepare the step of cylindrical optic chunk glass; B) one side of described blank is processed into the step of plane; C) take described plane as benchmark, the another side relative with described plane of described blank is processed into the first predetermined surface, and the step of the edging of feeling relieved for the first time take described the first predetermined surface or described plane as benchmark; D) take described the first predetermined surface as benchmark, described plane machining is become to the step of the second predetermined surface; And e) feel relieved for the second time take described the first predetermined surface or described the second predetermined surface as the benchmark step of edging.
As mentioned above, the present invention is by forming before the second predetermined surface and the edging of respectively once feeling relieved afterwards, carry out altogether centering edging twice, therefore thick limit difference can be controlled to the scope of Δ t < 0.05, can reduce the centre deviation of meniscus lens, to meet the requirement of design.And the present invention processes the first predetermined surface take plane as benchmark, more easily guarantee the machining accuracy of the first predetermined surface.
In the processing method of meniscus lens of the present invention, process the step of described plane, comprise the step of corase grind, fine grinding and polishing; Process the step of described the first predetermined surface and described the second predetermined surface, comprise the step of milling, corase grind, fine grinding and polishing.
In the processing method of meniscus lens of the present invention, process the step of described the first predetermined surface, it is the step that the another side relative with described plane of described blank is processed into the first predetermined surface forming by concave surface with described parallel plane flat surface, or, be the step that the another side relative with described plane of described blank is processed into the first predetermined surface being formed by concave surface.Thus, the present invention can be applicable to the processing that has flat surface and do not have the meniscus lens of flat surface simultaneously.
Wherein, the processing method of meniscus lens of the present invention, in the case of the another side relative with described plane of described blank being processed into the first predetermined surface forming by concave surface with described parallel plane flat surface, after described the first predetermined surface being made up of described flat surface and concave surface machines, the edging of feeling relieved for the first time described in carrying out.Or, after described concave surface machines, described flat surface first being processed, the edging of feeling relieved for the first time described in carrying out.And, now process the step of described the second predetermined surface, be the step of processing described the second predetermined surface take described flat surface as benchmark.Because flat surface is parallel to plane, so can either improve the second predetermined surface machining accuracy, can avoid again the fineness of concave surface to damage.
In addition, the processing method of meniscus lens of the present invention, in the case of the another side relative with described plane of described blank being processed into the first predetermined surface being formed by concave surface, after described concave surface machines, the edging of feeling relieved for the first time described in carrying out.
In addition, in the processing method of meniscus lens of the present invention, processing the step of described the second predetermined surface, is take described the first predetermined surface as benchmark, the step of the second predetermined surface that described plane machining is become to be made up of convex surface.Because the first predetermined surface is concave surface or is made up of concave surface and flat surface, so can process with table top or the meniscus lens with table top not by this method.
Further, the step of the edging of feeling relieved for the second time take described the first predetermined surface or described the second predetermined surface as benchmark, can obtain high-precision meniscus lens.
In addition, the present invention also comprises the product being obtained by the processing method of meniscus lens of the present invention.
In sum, according to the processing method of meniscus lens of the present invention, by forming before the second predetermined surface and the edging of respectively once feeling relieved afterwards, carry out altogether centering edging twice, the scope that thick limit difference can be controlled to Δ t < 0.05, reduces centre deviation as much as possible.In addition, the present invention can process take plane as benchmark the first predetermined surface, more easily guarantees the machining accuracy of the first predetermined surface.
In addition, in the processing method of meniscus lens of the present invention, in the time of processing plane, processing the first predetermined surface and processing the second predetermined surface, all can optionally adopt into the mode of dish processing, therefore can improve working (machining) efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic flow diagram of the processing method of the meniscus lens of the embodiment of the present invention 1.
Fig. 2 is the part blank figure of the embodiment of the present invention 1.
Fig. 3 is the semi-finished product structure schematic diagram of feeling relieved for the first time after edging of the embodiment of the present invention 1.
Fig. 4 is the finished product structure schematic diagram of feeling relieved for the second time after edging of the embodiment of the present invention 1.
Fig. 5 is the schematic flow diagram of the processing method of the meniscus lens of the embodiment of the present invention 2.
Fig. 6 is the semi-finished product structure schematic diagram of feeling relieved for the first time after edging of the embodiment of the present invention 2.
Fig. 7 is the finished product structure schematic diagram of feeling relieved for the second time after edging of the embodiment of the present invention 2.
Fig. 8 is the schematic diagram of the method for the meniscus lens of processing belt flat surface in prior art.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail, and the present invention processes nearly concentric circles meniscus lens by the method for twice edging of feeling relieved.But, nearly concentric circles meniscus lens is a concrete embodiment, and the present invention also goes for the processing of the nearly exigent meniscus lens to centre deviation with radius or similar specification.
(embodiment 1)
Fig. 1 has represented the schematic flow diagram of the processing method of the meniscus lens of the embodiment of the present invention 1, and Fig. 2～Fig. 4 has schematically shown the process of the processing method of the meniscus lens with flat surface of the embodiment of the present invention 1.
Flow process referring to Fig. 1 describes.
The one side of the blank shown in step 11. manuscript 2 is plane, through corase grind, fine grinding and polishing, until its surface smoothness reaches optical cement level, and for example Rz=0.025 and following, aperture N=-0.5, and coat very thin marine glue.
Step 12. is take the plane that processes as benchmark milling another side is as concave surface, then passes through corase grind, fine grinding and polishing, until its surface reaches designing requirement, and is coated with protection glue.
Step 13. is by plane optical cement on mirror disk, and the average table top of regrinding makes it and plane parallel, until the edge thickness difference of whole dish is less than 0.01mm, the semi-finished product that at this moment form are shown in Fig. 3.
Step 14. is bonded at the concave surface processing on the copper pipe of centering-edging machine with bonded adhesives, moving parts is until the picture point in eyepiece is almost motionless, the edging of then feeling relieved.
Step 15. is worn into convex surface take flat surface as datum level by plane milling, then roughly grinds, refines convex surface, and take flat surface as benchmark, controls edge thickness difference and be less than 0.01mm, finally by designing requirement polishing convex surface.
Step 16. is bonded at convex surface or flat surface or concave surface on the copper pipe of centering-edging machine with bonded adhesives, moving parts is until the picture point in eyepiece is almost motionless, and the edging of then feeling relieved, finally does protectiveness chamfering, forms the meniscus lens with flat surface shown in Fig. 4.
In the present embodiment, represent first to process concave surface, reprocessing flat surface, the situation of the edging of then feeling relieved for the first time.But the invention is not restricted to this, step 12,13,14 order can change, as long as feel relieved for the first time edging after concave surface machines.For example can reprocess concave surface by first processing platform face, the edging of then feeling relieved for the first time, at this moment, the processing method of flat surface is that whole face is processed as to plane in fact.In addition,, in the situation that first processing concave surface as shown in Figure 1, also can after the edging of feeling relieved for the first time, reprocess flat surface.In addition, when the present embodiment is felt relieved for the first time edging in step 14, concave surface is bonded to the edging of feeling relieved on centering-edging machine, can plays like this effect that prevents lens fragmentation, but the present invention is not limited thereto, also plane can be bonded to the edging of feeling relieved on centering-edging machine.
(embodiment 2)
Fig. 5 has represented the schematic flow diagram of the processing method of the meniscus lens of the embodiment of the present invention 2, and Fig. 6～Fig. 7 has schematically shown the not process of the processing method of the meniscus lens with platform of the embodiment of the present invention 2.Flow process referring to Fig. 5 describes, but to wherein omitting and illustrate with step identical in the flow process of Fig. 1.But, in processing not when the meniscus lens with platform, the edge thickness TE of meniscus lens should be more than 5mm, otherwise may obtain sufficiently high precision.
Step 51. is used the blank shown in Fig. 2, carries out the processing identical with step 11.
Step 52., take the plane that processes as benchmark milling another side is as concave surface, herein, can not reserve table top, then pass through corase grind, fine grinding and polishing on blank, until its surface reaches designing requirement, and is coated with protection glue, and the semi-finished product that at this moment form are shown in Fig. 6.
Step 53. is bonded at the concave surface processing on the copper pipe of centering-edging machine with bonded adhesives, moving parts is until the picture point in eyepiece is almost motionless, the edging of then feeling relieved.
Step 54. is worn into convex surface take concave surface as datum level by plane milling, then roughly grinds, refines convex surface, and take concave surface as benchmark, controls edge thickness difference and be less than 0.02mm, finally by designing requirement polishing convex surface.
Step 55. is bonded at convex surface or concave surface on the copper pipe of centering-edging machine with bonded adhesives, moving parts is until the picture point in eyepiece is almost motionless, and the edging of then feeling relieved, finally does protectiveness chamfering, forms the not meniscus lens with flat surface shown in Fig. 7.
Wherein, with embodiment 1 in the same manner, the present embodiment is in the time of the edging of centering for the first time of step 53, concave surface is bonded to the edging of feeling relieved on centering-edging machine, can play like this effect that prevents lens fragmentation, but the present invention is not limited thereto, also plane can be bonded to the edging of feeling relieved on centering-edging machine.
According to the abovementioned embodiments of the present invention, by carrying out centering edging twice, the spherical surface inclination angle that can guarantee obtained meniscus lens reaches 0.5 '～2 ' with interior (edge thickness difference 0.005～0.02, diameter of part is not identical, this numerical value can change), conventional method can only reach 5 '～10 ' (edge thickness difference 0.05～0.1, diameter of part is not identical, this numerical value can change).
Therefore, the present invention can be applicable to the manufacture of the meniscus lens high to centre deviation requirement.

Claims (6)

1. a processing method for meniscus lens, is characterized in that said method comprising the steps of:
A) step of preparation cylindrical optic chunk glass;
B) one side of described blank is processed into the step of the plane of optical cement level;
C) take described plane as benchmark, the another side relative with described plane of described blank is processed into the first predetermined surface, and take described the first predetermined surface or described plane as benchmark, utilize feel relieved for the first time step of edging of centering-edging machine;
D) take described the first predetermined surface as benchmark, described plane machining is become to the step of the second predetermined surface; With
E) take described the first predetermined surface or described the second predetermined surface as benchmark, utilize feel relieved for the second time step of edging of centering-edging machine,
Wherein, processing the step of described the first predetermined surface, is the step that the another side relative with described plane of described blank is processed into the first predetermined surface forming by concave surface with described parallel plane flat surface,
Processing the step of described the second predetermined surface, is the step of processing described the second predetermined surface take described flat surface as benchmark.
2. the processing method of meniscus lens as claimed in claim 1, is characterized in that processing the step of described plane, comprises the step of corase grind, fine grinding and polishing; Process the step of described the first predetermined surface and described the second predetermined surface, comprise the step of milling, corase grind, fine grinding and polishing.
3. the processing method of meniscus lens as claimed in claim 1, is characterized in that after described the first predetermined surface being made up of described flat surface and concave surface machines the edging of feeling relieved for the first time described in carrying out.
4. the processing method of meniscus lens as claimed in claim 1, is characterized in that after described concave surface machines, described flat surface first being processed, the edging of feeling relieved for the first time described in carrying out.
5. the processing method of the meniscus lens as described in any one in claim 1～4, is characterized in that processing the step of described the second predetermined surface, is take described the first predetermined surface as benchmark, the step of the second predetermined surface that described plane machining is become to be made up of convex surface.
6. a meniscus lens, is characterized in that:
It is the product being obtained by the processing method of the meniscus lens described in any one in claim 1～5.
CN201110424857.2A 2011-12-16 2011-12-16 Meniscus lens and processing method therefor Active CN102490103B (en)

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CN104290002B (en) * 2013-11-28 2016-08-17 中国航空工业集团公司洛阳电光设备研究所 A kind of processing method of cylindrical mirror
CN104029095B (en) * 2014-06-18 2016-08-24 福建华科光电有限公司 A kind of processing method ensureing non-spherical lens center deviation
CN105598749A (en) * 2015-11-09 2016-05-25 长春博启光学玻璃制造有限公司 Machining method and machining equipment for full-equal-thickness hemispheric and super-hemispheric sapphire fairing
CN106541311B (en) * 2016-10-13 2018-07-13 中国航空工业集团公司洛阳电光设备研究所 A kind of processing method of wedge mirror
CN113198697B (en) * 2021-05-31 2022-07-26 苏州大学 Fixture and method for positioning workpiece and processing method of optical element
CN114310495B (en) * 2021-12-31 2023-02-10 北京创思工贸有限公司 Sapphire optical element processing method based on lower-swinging machine
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