CN111596431A - Temperature compensation type plastic optical system and manufacturing method thereof - Google Patents
Temperature compensation type plastic optical system and manufacturing method thereof Download PDFInfo
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- CN111596431A CN111596431A CN202010536643.3A CN202010536643A CN111596431A CN 111596431 A CN111596431 A CN 111596431A CN 202010536643 A CN202010536643 A CN 202010536643A CN 111596431 A CN111596431 A CN 111596431A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 11
- 239000011521 glass Substances 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 9
- 238000003384 imaging method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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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
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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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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- Optics & Photonics (AREA)
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Abstract
The invention relates to the field of optical application of lenses, in particular to a temperature compensation type plastic optical system. Including moulding compensation casing and moulding lens, mould the internal connection of compensation casing and mould lens, make and mould compensation casing and mould lens and satisfy: Δ f ═ Δ T ═ L ═ at; delta f is the effective focal length change of the plastic lens when the temperature changes; Δ T is the temperature change; l is the horizontal distance from the incident end of the plastic lens facing the light path to the end part of the plastic compensation shell; and at is the linear expansion coefficient of the plastic compensation shell. The invention solves the problem of wide temperature application of the plastic optical system by respectively utilizing the thermal properties of the plastic lens and the plastic compensation shell; the whole optical system is made of plastic materials, and compared with a glass lens metal shell, the system is light in weight, low in cost, multiple in material selectivity and capable of being molded for mass production.
Description
Technical Field
The invention relates to the field of optical application of lenses, in particular to a temperature compensation type plastic optical system and a manufacturing method thereof.
Background
The optical system generally consists of a single or multiple piece optical lens and a mechanical optical cavity. According to different application scenes, different requirements are provided for temperature, humidity, vibration resistance and the like. The existing optical lens is generally made of glass materials or plastic materials, and the optical lens made of the glass materials has more stable performance but higher price; the plastic optical lens is not very stable in temperature characteristics, but is low in price. In particular, the refractive index and the surface shape of the molded lens change with temperature change, and thus the optical characteristics of the molded lens often change greatly.
Disclosure of Invention
The invention aims to provide a temperature compensation type plastic optical system. The invention solves the problem of poor imaging effect caused by effective concentration change when the temperature is increased when the plastic lens in the prior art is used.
In order to solve the technical problems, the following technical scheme is proposed:
temperature compensation formula is moulded and is made optical system, including moulding compensation casing and moulding lens, mould the internal connection of compensation casing and mould lens, make and mould compensation casing and mould lens and satisfy: Δ f ═ Δ T ═ L ═ at;
delta f is the effective focal length change of the plastic lens when the temperature changes;
Δ T is the temperature change;
l is the horizontal distance from the incident end of the plastic lens facing the light path to the end part of the plastic compensation shell;
and at is the linear expansion coefficient of the plastic compensation shell.
The molded lens is cheap, but in use, because the molded lens is unstable, the refractive index and the surface shape of the molded lens are changed under the condition of temperature change, and the change of the refractive index can cause the change of the effective focal length delta f1The change of the surface shape results in a change of the effective focal length Δ f2Therefore, the effective focal length of the molded lens varies Δ f ═ Δ f1+ Δ f 2. The change of the effective convergence can cause the position of the image formed by the plastic lens to change, and the image can be used as the position of the object of the second plastic lens, so that the image formed by the first plastic lens can not fall on the position of the object of the second plastic lens when the effective focal length is changed, and the imaging effect of the second lens is poor.
In order to compensate the effective focal length, the plastic compensation shell and the plastic lens meet the following requirements: and delta f is delta T L at, and when the effective focal length is changed, the focal length change is compensated by mechanical change of the plastic compensation shell. The imaging position of the first plastic lens can be located at the position of the second lens object, and the imaging effect is guaranteed.
Select for use low-cost mould system lens, use simultaneously and mould system compensation casing, not only satisfied the compensation to effective focal length, and have with low costs, easily batch production's advantage.
Wherein Δ f1And Δ f2Calculated using calculation means well known to those skilled in the art; l is the horizontal distance from the incident end of the plastic lens to the end of the plastic compensation shell, and the L section can freely expand along with the temperature change.
A stepped hole is formed in the plastic compensation shell, and a plastic lens is connected in the first stepped hole.
Based on the structure, when the plastic lens is installed, the installation position of the plastic lens can be directly determined, the installation is facilitated, the installation efficiency is improved, and the production cost is reduced.
The inner diameter of the first stepped hole is larger than that of the second stepped hole.
The end face of the second stepped hole is connected with a connecting portion, the inner diameter of the connecting portion is equal to that of the second stepped hole, and the outer diameter of the connecting portion is larger than that of the second stepped hole.
The connecting part is integrally formed with the plastic compensation shell and is used for external bonding, and the connecting part does not expand when the temperature changes.
The plastic compensation shell is provided with a connecting part.
The optical systems are provided with a plurality of groups which are connected in sequence.
The number of optical systems is selected by those skilled in the art according to the actual application.
The manufacturing method of the temperature compensation type plastic optical system is as follows: manufacturing a plastic lens and a plastic compensation shell, installing the plastic lens in the plastic compensation shell,
delta f is the effective focal length change of the plastic lens when the temperature changes;
Δ T is the temperature change;
l is the horizontal distance from the incident end of the plastic lens facing the light path to the end part of the plastic compensation shell;
and at is the linear expansion coefficient of the plastic compensation shell.
The plastic compensation shell is integrally provided with a connecting part.
And connecting a plurality of plastic compensation shells in sequence.
By adopting the technical scheme, the beneficial effects brought are as follows:
1. the invention has simple structure, the plastic lens replaces the glass lens, and the cost is low when the film is pressed in batch; the plastic compensation shell replaces a metal shell, and also has the advantage of low cost; the wide temperature application problem of the plastic optical system is solved by respectively utilizing the thermal properties of the plastic lens and the plastic compensation shell; the whole optical system is made of plastic materials, and compared with a glass lens metal shell, the system is light in weight.
2. The inner diameter of the first stepped hole is larger than that of the second stepped hole, so that the plastic lens can be conveniently mounted, and the stability of the plastic lens can be ensured.
3. The optical system is provided with a plurality of groups, so that the effective focal lengths of the plastic lenses can be compensated by mechanical change, and the imaging effect is good. The optical system with different number according to the actual setting has the advantage of wide application range.
4. The invention has the advantages of light system weight, low cost, multiple material selectivity, capability of being molded and produced in batch, and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of the present invention;
in the drawings: 1. and the plastic compensation shell 2, the plastic lens 3 and the connecting part.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
The refractive index of the material of the molded lens 2 changes significantly when the temperature changes, which causes the effective focal length to change with temperature. At the same time, the surface shape of the molded lens 2 will also change due to the temperature, which will also affect the effective focal length of the lens.
By using professional simulation software, the change Δ T of the temperature, the refractive index change Δ n generated by the molded lens 2, and the change Δ f1 of the Effective Focal Length (EFL) caused by the refractive index change can be obtained through simulation calculation. Meanwhile, the Effective Focal Length (EFL) caused by the change of the surface shape due to the temperature change Δ T is changed to Δ f 2.
As shown in fig. 2, the plastic lens 2 is bonded to the plastic compensation housing 1, and the plastic compensation housing 1 is connected to the connection portion 3, and bonded to the outside through the connection portion 3, and the connection portion 3 is fixed during temperature change, so that expansion is not generated. And a region L in which the plastic compensation shell 1 can freely expand along with the temperature change, wherein the linear expansion coefficient of the material used for the plastic compensation shell 1 is at, and the length change Delta L is equal to Delta T L at when the temperature changes Delta T.
When Δ f1+ Δ f2 is ensured to be Δ T × L at, the optical system is not affected by temperature during temperature change, and the optical performance is stable. The design takes into account the material of the plastic lens 2, the surface parameters, the material of the plastic housing, the free expansion length L, etc.
Example 2
As shown in fig. 3, the present embodiment is different from embodiment 1 in that a connecting portion 3 is connected to the outside of a plastic compensation housing 1.
Example 3
As shown in fig. 4, two sets of optical systems are provided, and multiple sets of optical systems can be provided, and are selected according to actual needs. Viewing from the right incident end to the left in the figure, a first plastic compensation shell 1 and a second plastic compensation shell 1 are sequentially arranged, a first plastic lens 2 is arranged in the first plastic compensation shell 1, and a second plastic lens 2 is arranged in the second plastic compensation shell 1; the free expansion length of the first plastic compensation shell 1 is L1, and the linear expansion coefficient of the first plastic compensation shell 1 is at 1; the length of the second plastic compensation shell 1 is L2, and the linear expansion coefficient of the second plastic compensation shell 1 is at 2. Ensure that the molded lens 2 i (Δ f1+ Δ f2) and the molded lens 2 ii (Δ f1+ Δ f2) are Δ T × L × at1+ Δ T × L × at 2.
Example 4
The temperature compensation type plastic optical system comprises a plastic compensation shell 1 and a plastic lens 2, wherein the plastic lens 2 is connected in the plastic compensation shell 1, so that the plastic compensation shell 1 and the plastic lens 2 meet the following requirements: Δ f ═ Δ T ═ L ═ at;
Δ f is the effective focal length change of the molded lens 2 when the temperature changes;
Δ T is the temperature change;
l is the horizontal distance from the incident end of the plastic lens 2 facing the light path to the end of the plastic compensation shell 1;
at is the linear expansion coefficient of the plastic compensation shell 1.
The molded lens 2 is cheap, but in use, because the molded lens 2 is unstable, the refractive index and the surface shape of the molded lens 2 are changed under the condition of temperature change, the change of the refractive index can cause the effective focal length to change by delta f1, and the change of the surface shape can cause the effective focal length to change by delta f2, so that the effective focal length change delta f of the molded lens 2 is delta f1+ delta f 2. The change of the effective convergence can cause the position of the image formed by the plastic lens 2 to change, and the image can be used as the position of the object of the second plastic lens 2, so that the image formed by the first plastic lens 2 can not fall on the position of the object of the second lens when the effective focal length is changed, and the imaging effect of the second lens is poor.
In order to compensate for this effective focal length, the plastic compensation housing 1 and the plastic lens 2 are made to satisfy: Δ f Δ T L at, when the effective focal length changes, the focal length change is compensated by the mechanical change of the molded compensation housing 1. The imaging position of the first plastic lens 2 can be at the position of the second lens object, and the imaging effect is ensured.
Choose for use low-cost mould system lens 2, use simultaneously and mould system compensation casing 1, not only satisfied the compensation to effective focal length, and have with low costs, easily the advantage of mass production.
Wherein Δ f1 and Δ f2 are calculated using calculations well known to those skilled in the art; l is the horizontal distance from the injection end of the plastic lens 2 to the end of the plastic compensation shell 1, and the section L can freely expand along with the temperature change.
Example 5
In addition to embodiment 4, as shown in fig. 2, a stepped hole is formed in the molded compensation housing 1, and the molded lens 2 is connected to the first stepped hole.
Based on the structure, when the plastic lens is installed, the installation position of the plastic lens 2 can be directly determined, the installation is facilitated, the installation efficiency is improved, and the production cost is reduced.
The inner diameter of the first stepped hole is larger than that of the second stepped hole.
The terminal surface of second shoulder hole is connected with connecting portion 3, the internal diameter of connecting portion 3 equals the internal diameter of second shoulder hole, and the external diameter of connecting portion 3 is greater than the external diameter of second shoulder hole.
The connecting part 3 is provided integrally with the plastic compensating housing 1, the connecting part 3 is used for external bonding, and the connecting part 3 does not expand when the temperature changes.
Example 6
On the basis of embodiment 4, a stepped hole is formed in the plastic compensation housing 1, and the plastic lens 2 is connected in the first stepped hole.
Based on the structure, when the plastic lens is installed, the installation position of the plastic lens 2 can be directly determined, the installation is facilitated, the installation efficiency is improved, and the production cost is reduced.
As shown in fig. 2 and 3, the plastic compensation housing 1 is provided with a connecting portion 3, and a person skilled in the art determines the position of the connecting portion 3 according to actual needs.
Example 7
On the basis of embodiment 3, a plurality of groups of optical systems are arranged, and the plurality of groups of optical systems are connected in sequence.
The number of optical systems is selected by those skilled in the art according to the actual application.
Each group of optical systems can be connected with the connecting part 3, or the connecting parts 3 can be arranged on the optical systems at the two ends; the above-mentioned arrangement is merely exemplary and not limited to the above-mentioned arrangement.
The multiple optical systems satisfy (Δ f1+ Δ f2) + (Δ f1+ Δ f2) +. + - ((Δ f1+ Δ f2) ═ Δ T × L at1+ Δ T × L at2+ -. Δ T × L at 2)n。
To satisfy the above conditions, the connection portion 3 is provided so that the connection portion 3 does not increase the distance between the two plastic lenses 2.
Example 8
The manufacturing method of the temperature compensation type plastic optical system is as follows: Δ f Δ T L at, the plastic lens 2 and the plastic compensation housing 1 are manufactured, the plastic lens 2 is mounted in the plastic compensation housing 1,
Δ f is the effective focal length change of the molded lens 2 when the temperature changes;
Δ T is the temperature change;
l is the horizontal distance from the incident end of the plastic lens 2 facing the light path to the end of the plastic compensation shell 1;
at is the linear expansion coefficient of the plastic compensation shell 1.
The plastic compensation shell 1 is integrally provided with a connecting part 3.
A plurality of plastic compensating housings 1 are connected in sequence.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. Temperature compensation formula is moulded and is made optical system, its characterized in that: including moulding compensation casing (1) and moulding lens (2), mould compensation casing (1) in-connection and mould lens (2), make and mould compensation casing (1) and mould lens (2) and satisfy: Δ f ═ Δ T ═ L ═ at;
delta f is the effective focal length change of the plastic lens (2) when the temperature changes;
Δ T is the temperature change;
l is the horizontal distance from the incident end of the plastic lens (2) facing the light path to the end of the plastic compensation shell (1);
at is the linear expansion coefficient of the plastic compensation shell (1).
2. The temperature-compensated molding optical system of claim 1, wherein: a stepped hole is formed in the plastic compensation shell (1), and a plastic lens (2) is connected in the first stepped hole.
3. The temperature-compensated molding optical system according to claim 2, wherein: the inner diameter of the first stepped hole is larger than that of the second stepped hole.
4. The temperature-compensated molding optical system according to claim 3, wherein: the end face of the second stepped hole is connected with a connecting portion (3), the inner diameter of the connecting portion (3) is equal to that of the second stepped hole, and the outer diameter of the connecting portion (3) is larger than that of the second stepped hole.
5. The temperature-compensated molding optical system of claim 1, wherein: the plastic compensation shell (1) is provided with a connecting part (3).
6. The temperature-compensated molding optical system according to any one of claims 1 to 5, characterized in that: the optical systems are arranged in a plurality of groups which are connected in sequence, and the plurality of groups of optical systems meet the conditions that (delta f1+ delta f2) + (delta f1+ delta f2) +. + (delta f1+ delta f2) ═ delta T at1+ delta T at2+ -. delta T atn。
7. The manufacturing method of the temperature compensation type plastic optical system is characterized in that: according to the formula: manufacturing a plastic lens (2) and a plastic compensation shell (1) by delta f-delta T-L-at, and installing the plastic lens (2) in the plastic compensation shell (1);
delta f is the effective focal length change of the plastic lens (2) when the temperature changes;
Δ T is the temperature change;
l is the horizontal distance from the incident end of the plastic lens (2) facing the light path to the end of the plastic compensation shell (1);
at is the linear expansion coefficient of the plastic compensation shell (1).
8. The method of manufacturing a temperature-compensated molding optical system according to claim 7, wherein: the plastic compensation shell (1) is integrally provided with a connecting part (3).
9. The method for manufacturing a temperature-compensated plastic optical system according to claim 7 or 8, wherein: a plurality of plastic compensation shells (1) are connected in sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010536643.3A CN111596431A (en) | 2020-06-12 | 2020-06-12 | Temperature compensation type plastic optical system and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010536643.3A CN111596431A (en) | 2020-06-12 | 2020-06-12 | Temperature compensation type plastic optical system and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115236852A (en) * | 2022-08-16 | 2022-10-25 | 中国科学院上海技术物理研究所 | A kind of optical compensation device and design method of all-optical path low temperature system |
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| CN115236852A (en) * | 2022-08-16 | 2022-10-25 | 中国科学院上海技术物理研究所 | A kind of optical compensation device and design method of all-optical path low temperature system |
| CN115236852B (en) * | 2022-08-16 | 2024-01-26 | 中国科学院上海技术物理研究所 | Optical compensation device of all-optical-path low-temperature system and design method |
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Application publication date: 20200828 |
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| RJ01 | Rejection of invention patent application after publication |