CN113296213B - Miniaturization and lightweight design and preparation method of optical lens and optical lens - Google Patents
Miniaturization and lightweight design and preparation method of optical lens and optical lens Download PDFInfo
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- CN113296213B CN113296213B CN202110362524.5A CN202110362524A CN113296213B CN 113296213 B CN113296213 B CN 113296213B CN 202110362524 A CN202110362524 A CN 202110362524A CN 113296213 B CN113296213 B CN 113296213B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Abstract
The invention provides a miniaturization lightweight design and preparation method of an optical lens and the optical lens, and solves the problems that when the number of lenses of the conventional optical lens is large, the assembly difficulty is high, time and labor are consumed, and the imaging quality is difficult to ensure. The method comprises the following steps: 1) Processing corresponding lens frames according to each optical glass, wherein each lens frame is of a thin-wall structure, one end of each lens frame is provided with a first glue injection hole along the radial direction, and the other end of each lens frame is of a blue structure; assembling each optical glass to a corresponding mirror frame, and injecting an adhesive between the optical glass and the mirror frame to form each lens group by each optical glass and the corresponding mirror frame; 2) Mounting the mirror frame on a centering lathe through a flange structure, finely turning the outer circle of the mirror frame, and cutting off the flange structure of the mirror frame; 3) Sequentially installing each lens group in a lens cone, arranging spacing rings between adjacent lens groups, arranging a limiting structure at one end of the lens cone, and respectively trimming the thickness of each spacing ring in the installation process to ensure the optical interval between two adjacent lens groups; and a pressing ring is arranged at the other end of the lens cone to axially pre-tighten and fix the lens group.
Description
Technical Field
The invention relates to an optical lens structure design technology, in particular to a miniaturized lightweight design and preparation method of an optical lens and the optical lens.
Background
The structural design of the optical lens provides support for the optical system to enable the optical system to complete the optical function of the optical system, and the structural design ensures the imaging quality of the optical system, and simultaneously reduces the overall dimension and the weight of the optical lens as much as possible to achieve miniaturization and light weight.
A conventional optical lens structure is designed as shown in fig. 1, an optical system is composed of 7 pieces of optical glass 01 (lenses), an axial interval between adjacent optical glass 01 is ensured by trimming a thickness of a spacer ring 02 between the two optical glass 01, and a radial position of the optical glass 01 is ensured by fitting with an inner circle of a lens barrel 03. The structure mode has the advantages of simple structure mode and easy processing. However, when the optical glass 01 is processed, the coaxiality of the optical axis and the excircle of the optical glass 01 has an error, and the optical glass 01 and the lens barrel 03 are in clearance fit, so that when the optical lens is assembled, the mutual coaxiality between the optical glass 01 needs to be continuously adjusted to ensure the imaging quality of the optical system. However, when the number of lenses of the optical system is large, the adjustment difficulty is large, time and labor are consumed, and it is difficult to ensure the imaging quality of the optical system.
Disclosure of Invention
The invention provides a small-size light-weight design and preparation method of an optical lens and the optical lens, aiming at solving the technical problems of high assembly difficulty, time and labor consumption and difficulty in ensuring the imaging quality of an optical system when the number of lenses of the conventional optical lens is large.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for designing and preparing an optical lens in a miniaturized and lightweight manner is characterized by comprising the following steps:
1) Assembling optical glasses
1.1 Processing a corresponding lens frame according to each optical glass, and enabling a fit clearance d between each optical glass and the corresponding lens frame to be 0.1mm-0.2mm;
each mirror frame is of a thin-wall structure with the thickness of 0.6mm to 0.8mm, a plurality of first glue injection holes which are circumferentially arranged are formed in the outer side wall of one end of each mirror frame along the radial direction, and a flange structure is arranged at the other end of each mirror frame;
1.2 Assembling each optical glass to one end of the corresponding mirror frame provided with a first glue injection hole, and injecting adhesive into a gap between the optical glass and the mirror frame through the first glue injection hole until the gap is full, wherein each optical glass and the corresponding mirror frame form each lens group;
2) Centering process for lens set
2.1 After the adhesive is cured, one of the mirror frames is arranged on a centering lathe through a flange structure, and the excircle of the mirror frame is finely turned to ensure that the coaxiality of the mirror frame and the optical glass is better than 0.01mm; then cutting off the flange structure of the mirror frame, and simultaneously ensuring that the axial dimensions of the mirror frame and the optical glass meet the design requirements;
2.2 Processing the other lens groups in sequence by using the method of the step 2.1) until the centering processing of all the lens groups is finished;
3) Assembling of lens sets
3.1 A second glue injection hole is arranged at the position on the lens cone matched with the lens frame of each lens group;
3.2 Each lens group is sequentially arranged in a lens cone according to the direction of a light path, a spacing ring is arranged between adjacent lens groups, and a limiting structure is arranged at one end part of the lens cone and used for realizing the axial limiting of the lens groups; the limiting structure is an annular limiting boss;
3.3 In the installation process, the thickness of each spacing ring is respectively trimmed to ensure the optical interval between two adjacent lens groups;
3.4 A pressing ring is arranged at the other end of the lens cone to axially pre-tighten and fix the lens groups, and adhesive is injected between the lens cone and the lens frame of each lens group through a second glue injection hole to complete the structural support and positioning of the optical system.
Further, in step 1.1), an inner circular surface at one end of each lens frame is provided with an annular notch for placing corresponding optical glass.
Further, in step 1.1), the first glue injection hole is a threaded hole.
Further, in the step 1.1), the plurality of first glue injection holes are uniformly distributed along the circumferential direction.
Meanwhile, the invention also provides an optical lens, which is characterized in that: the optical lens is manufactured by the miniaturization and lightweight design and preparation method of the optical lens;
the optical lens comprises a lens cone, a plurality of lens groups, a spacing ring, a limiting structure and a pressing ring, wherein the lens groups are sequentially arranged in the lens cone along the axial direction, the spacing ring is arranged between every two adjacent lens groups, the limiting structure is arranged at one end of the lens cone and used for limiting the lens groups in the axial direction, and the pressing ring is arranged at the other end of the lens cone and used for pre-tightening and fixing the lens groups in the axial direction;
every group includes the picture frame, sets up the optical glass in the picture frame and flows to the adhesive between picture frame and the optical glass through first injecting glue hole on the picture frame.
Compared with the prior art, the invention has the advantages that:
1. according to the method, the gaps between the optical glass and the mirror frame are reasonably designed, and the adhesive is injected through the first glue injection hole, so that on one hand, the radial constraint on the optical glass can be realized, and the use reliability is improved; on the other hand, the optical glass and the lens frame are in clearance fit, and the adhesive between the optical glass and the lens frame improves the temperature application range of the optical lens; each lens group adopts a centering processing technology, the coaxiality of an optical axis and the excircle of a machine (a mirror frame) is ensured, and after each lens group is installed, the imaging quality of the whole optical system is improved; the invention can realize the fixation of all the lens groups by only adopting one pressing ring, and simultaneously, the lens frame adopts a thin-wall structure, thereby not only ensuring the imaging quality, but also reducing the appearance size and the weight.
2. According to the method, a centering processing technology is adopted for each lens group, an independent lens frame is designed for each piece of glass in an optical system, the optical axis of the glass is determined through a high-precision centering instrument on a centering lathe, the outer circle and the end face of the lens frame are finely turned by taking the optical axis as a reference, and the eccentricity and the inclination between the optical axis and the lens frame are eliminated.
3. The method has the characteristics of simple design, wide application range, remarkable miniaturization and lightweight effect and the like, and can be popularized and applied in engineering practice.
4. According to the invention, the first glue injection hole is designed to be a threaded hole, and the threaded hole can increase the combination degree between the adhesive and the hole and improve the bonding fastness.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to the prior art;
in fig. 1, the reference numerals are as follows:
01-optical glass, 02-space ring, 03-lens cone.
FIG. 2 is a schematic structural diagram of an optical lens according to the present invention;
FIG. 3 is a schematic view of a lens assembly of the optical lens of the present invention;
in fig. 2 and 3, the reference numerals are as follows:
1-lens cone, 11-limit structure, 12-second glue injection hole, 2-pressing ring, 3-spacing ring, 4-lens group, 41-optical glass, 42-lens frame, 421-first glue injection hole, 422-flange structure, 423-annular gap.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The invention relates to an optical lens, which comprises a lens cone 1 and a plurality of lens groups 4 arranged in the lens cone 1, wherein 7 lens groups 4 are taken as an example in the embodiment, as shown in fig. 2, the 7 lens groups 4 are sequentially arranged in the lens cone 1 from the front end (the left side in the fig. 1) of the lens cone 1 shown in fig. 2 along the axial direction, the arrangement sequence of the 7 lens groups 4 meets the light path trend of an optical system, a spacing ring 3 is arranged between two adjacent lens groups 4, a limiting structure 11 for axially limiting the lens group 4 at the last side is arranged at the rear end part of the lens cone 1, the limiting structure 11 is an annular limiting boss arranged on the inner circular surface at the rear end part of the lens cone 1 in the embodiment, and a pressing ring 2 is arranged at the front end of the lens cone 1.
Each lens group 4 includes a lens frame 42 and optical glass 41, as shown in fig. 3, the optical glass 41 is installed in the lens frame 42, the optical glass 41 is fixed by using an adhesive, the lens frame 42 is designed to be thin-walled, the thickness of the thin wall is 0.6mm to 0.8mm, and a process flange structure 422 is designed for fixing the optical glass 41 on a centering lathe, and eccentricity and inclination of an optical axis relative to an outer circle and an end face of the lens frame 42 are eliminated through centering processing.
After each lens group 4 is centered, each lens group is installed inside the lens cone 1, the optical interval between two adjacent lenses is ensured by trimming the thickness of the spacing ring 3, and the spacing ring 3 is utilized to axially constrain the lens group 4. After all the lens groups 4 are installed, the lens groups 4 are axially pre-tightened and fixed by the pressing ring 2, so that the light and small optical lens is designed.
The optical lens has the following specific design and assembly processes of miniaturization and light weight:
1) Each optical glass 41 is assembled
1.1 As shown in fig. 3, a corresponding lens frame 42 is processed according to each optical glass 41, and when the structure is designed, the outer circle of each optical glass 41 is ensured to be in clearance fit with the corresponding lens frame 42, and the fit clearance d is 0.1mm to 0.2mm;
in order to realize light weight and miniaturization, each mirror frame 42 is of a thin-wall structure, an inner circular surface at the front end of each mirror frame is provided with an annular notch 423 for placing corresponding optical glass 41, the outer side wall at the front end is radially provided with a plurality of first glue injection holes 421 which are uniformly distributed in the circumferential direction and communicated with the annular notch 423, and the rear end of each mirror frame 42 is provided with a process flange structure 422;
1.2 When each optical glass 41 and the corresponding lens frame 42 are assembled, firstly, the optical glass 41 is assembled into the annular gap 423 of the corresponding lens frame 42, adhesive is injected into the gap between the optical glass 41 and the lens frame 42 through the first adhesive injection hole 421 on the outer circle of the lens frame 42 until the gap is full, redundant adhesive is erased, the optical glass 41 and the corresponding lens frame 42 form a lens group 4, and each bonded lens group 4 is arranged in a drying cabinet until the adhesive is completely cured;
2) Centering process for lens group 4
2.1 After the adhesive is cured, the lens group 4 is mounted on a high-precision centering lathe through a flange structure 422 (flange mounting hole) on one of the lens frames 42, the optical axis of the optical glass 41 is determined by using a centering instrument, the outer circle of the lens frame 42 is finely turned to ensure that the coaxiality is better than 0.01mm, finally the flange structure 422 of the lens frame 42 is cut off, and meanwhile, the axial dimension is ensured to meet the design requirement, the axial dimension refers to the length from the fixed point of the optical glass 41 to the cut surface, and the length of each group of lens groups 4 is different and is related to the actual required design;
2.2 By analogy, sequentially carrying out centering processing on the rest lens groups 4 and cutting off the process flange structure 422 according to the method in the step 2.1) until the centering processing of all the lens groups 4 is finished;
3) Assembly of mirror groups 4
3.1 Second glue injection holes 12 are arranged on the lens cone 1 at the positions matched with the lens frames 42 of each lens group 4;
3.2 Each lens group 4 is sequentially arranged in the lens cone 1 according to the direction of the optical path of the optical system, a spacing ring 3 is arranged between the adjacent lens groups 4, and a limiting structure 11 is arranged at the rear end part of the lens cone 1 shown in fig. 2 and used for realizing the axial limiting of the lens groups 4;
3.3 In the installation process, the optical interval between two adjacent lens groups 4 is ensured by trimming the thickness of each spacing ring 3;
3.4 After all the lens groups 4 are installed, the pressing ring 2 is installed at the front end of the lens barrel 1, the lens groups 4 are axially pre-tightened and fixed by the pressing ring 2, then adhesive is injected between the lens barrel 1 and the lens frame 42 of each lens group 4 through the second adhesive injection hole 12, each lens group 4 is further fixed by adhesive injection, the reliability of the lens group 4 in a mechanical environment is ensured, and therefore structural support and positioning of an optical system are achieved.
First notes gluey hole 421 and second notes gluey hole 12 design are the screw hole in this embodiment, because the through-hole internal glue drops easily, the screw hole can increase the combination degree between gluey and the hole.
The design method of the invention controls the glue injection amount by adjusting the fit clearance between the outer circle of the optical glass 41 and the inner circle of the lens frame 42, namely changing the diameter size of the inner circle of the lens frame 42 to change the fit clearance between the glass and the lens frame 42, thereby achieving the purpose of fixing the optical glass 41. And then the eccentricity and the inclination between the optical axis and the lens frame 42 are eliminated by a centering processing process method, the coaxiality between the lens group 4 is ensured, and the imaging quality of the whole optical system is improved.
The optical lens shown in fig. 1 is assembled with a maximum radial dimension D1 of 31.8mm and a minimum radial dimension D2 of 18 mm. The maximum radial dimension D3 of the optical lens designed by the method of the embodiment is 31.8mm, and the minimum radial dimension D4 of the optical lens is 19.2 mm, so that the optical lens of the embodiment has the same dimension as the conventional lens, but the coaxiality among the lens groups 4 is good, so that the imaging quality of an optical system is excellent, and meanwhile, the miniaturization and lightweight design is realized on the basis of ensuring the imaging quality of the lens.
In the lens design method shown in fig. 1, the outer circle of each lens is matched with the inner circle of the lens barrel 1 to ensure the coaxiality of the optical system, the matching precision depends on the processing quality of the lens barrel 1 and the lens, when the optical system comprises a plurality of lenses, the coaxiality of the optical system is difficult to ensure, or the coaxiality is corrected by debugging with great time and energy, so that the ideal imaging quality is obtained, and the method is time-consuming, labor-consuming and low in production efficiency. In the lens design method shown in fig. 2 of the present embodiment, each lens is designed to have a separate frame 42, and there is no requirement for assembly accuracy between the lens and the frame 42, so that the coaxiality of the optical glass 41 and the frame 42 is not required to be high, thereby reducing the processing cost of optical parts and structural parts. By means of the centering processing technology, the optical axis of the optical glass 41 is used as a reference, the outer circle and the end face of the lens frame 42 are trimmed, so that the eccentricity and the inclination of the optical axis relative to the outer circle of the lens frame 42 are eliminated, the rest can be done by analogy, the coaxiality of the plurality of lens groups 4 is guaranteed, the good imaging quality is finally obtained, and the production efficiency is greatly improved. The lens frame 42 adopts a thin-wall structure, and the imaging quality of the lens is improved on the premise of not increasing the size and the quality of the lens structure. Because the lenses and the frame 42 are bonded by using glue, the use reliability of the lenses is improved.
The design method provides a design idea for light weight and miniaturization design of the optical lens by improving the structural design. The method solves the problems that the traditional design method cannot ensure the imaging quality of an optical system or ensures the imaging quality and simultaneously has larger size, heavier weight and the like of an optical lens. The method has the characteristics of simple design, wide application range, remarkable miniaturization and lightweight effect and the like, and can be popularized and applied in engineering practice.
The above description is only for the preferred embodiment of the present invention and does not limit the technical solution of the present invention, and any modifications made by those skilled in the art based on the main technical idea of the present invention belong to the technical scope of the present invention.
Claims (4)
1. A method for designing and manufacturing an optical lens in a miniaturized and lightweight manner is characterized by comprising the following steps:
1) Assemble each optical glass (41)
1.1 Processing a corresponding lens frame (42) according to each optical glass (41), and enabling a fit clearance d between each optical glass (41) and the corresponding lens frame (42) to be 0.1mm to 0.2mm;
each mirror frame (42) is a thin-wall structure with the thickness of 0.6mm to 0.8mm, a plurality of first glue injection holes (421) which are circumferentially arranged are formed in the outer side wall of one end of each mirror frame in the radial direction, and a flange structure (422) is formed at the other end of each mirror frame;
the inner circle surface of one end of each lens frame (42) is provided with an annular notch (423) for placing corresponding optical glass (41);
1.2 Assembling each optical glass (41) to one end of the corresponding lens frame (42) provided with a first glue injection hole (421), injecting adhesive into a gap between the optical glass (41) and the lens frame (42) through the first glue injection hole (421) until the gap is full, forming each lens group (4) by each optical glass (41) and the corresponding lens frame (42), and enabling the lens frame (42) to be matched with each optical glass (41) in a full circle;
2) Centering processing of lens group (4)
2.1 After the adhesive is cured, one of the mirror frames (42) is mounted on a centering lathe through a flange structure (422), and the excircle of the mirror frame (42) is finely turned, so that the coaxiality of the mirror frame (42) and the optical glass (41) is better than 0.01mm; then cutting off a flange structure (422) of the lens frame (42), and simultaneously ensuring that the axial dimensions of the lens frame (42) and the optical glass (41) meet the design requirements;
2.2 Processing the other lens groups (4) in sequence by using the method of the step 2.1) until the centering processing of all the lens groups (4) is completed;
3) The assembly of each lens group (4)
3.1 A second glue injection hole (12) is arranged at the position on the lens cone (1) matched with the lens frame (42) of each lens group (4);
3.2 The lens groups (4) are sequentially arranged in the lens cone (1) according to the direction of a light path, a spacing ring (3) is arranged between the adjacent lens groups (4), and a limiting structure (11) is arranged at one end part of the lens cone (1) and is used for realizing the axial limiting of the lens groups (4); the limiting structure (11) is an annular limiting boss;
3.3 In the installation process, the thickness of each space ring (3) is respectively trimmed and cut to ensure the optical interval of two adjacent lens groups (4);
3.4 A pressing ring (2) is arranged at the other end of the lens cone (1) to axially pre-tighten and fix the lens groups (4), and adhesive is injected between the lens cone (1) and the lens frame (42) of each lens group (4) through a second adhesive injection hole (12) to complete the structural support and positioning of the optical system.
2. The method for designing and manufacturing an optical lens according to claim 1, wherein the method comprises the steps of: in the step 1.1), the first glue injection hole (421) is a threaded hole.
3. The method for designing and manufacturing an optical lens according to claim 2, wherein the method comprises the steps of: in the step 1.1), the plurality of first glue injection holes (421) are uniformly distributed along the circumferential direction.
4. An optical lens, characterized in that: the optical lens is prepared by the method for designing and preparing the optical lens according to any one of claims 1 to 3 in a miniaturized and lightweight manner;
the lens comprises a lens cone (1), a plurality of lens groups (4) which are sequentially arranged in the lens cone (1) along the axial direction, a spacing ring (3) which is arranged between two adjacent lens groups (4), a limiting structure (11) which is arranged at one end of the lens cone (1) and used for axially limiting the lens groups (4), and a pressing ring (2) which is arranged at the other end of the lens cone (1) and used for axially pre-tightening and fixing the lens groups (4);
each lens group (4) comprises a lens frame (42), optical glass (41) arranged in the lens frame (42) and an adhesive injected between the lens frame (42) and the optical glass (41) through a first injection hole (421) in the lens frame (42).
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| Microfabrication of lenses of a miniaturized electron column;M.Despont 等;《Microelectronic Engineering》;19950228;第27卷(第1-4期);第467-470页 * |
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| CN113296213A (en) | 2021-08-24 |
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