CN211014814U - High-definition wide-angle external lens optical system - Google Patents
High-definition wide-angle external lens optical system Download PDFInfo
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- CN211014814U CN211014814U CN201922493487.2U CN201922493487U CN211014814U CN 211014814 U CN211014814 U CN 211014814U CN 201922493487 U CN201922493487 U CN 201922493487U CN 211014814 U CN211014814 U CN 211014814U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 230000005499 meniscus Effects 0.000 claims abstract description 11
- 239000011521 glass Substances 0.000 claims description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims description 3
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The utility model discloses an external camera lens optical system of high definition wide angle, this external camera lens optical system has set gradually preceding negative group lens, diaphragm and positive back group lens along the optical axis from the thing side to the image side, preceding negative group lens includes first lens, second lens and third lens in proper order, first lens and second lens are the falcate lens of negative focal power, and the concave surface of first lens and second lens all faces the image side, the third lens is the biconvex lens of positive focal power; the positive rear group lens sequentially comprises a fourth lens, a first cemented lens and a second cemented lens, wherein the fourth lens is a meniscus lens with positive focal power, the convex surface of the fourth lens faces the image side, the first cemented lens is a double-convex lens with positive focal power, and the second cemented lens is a meniscus lens with positive focal power; the external lens has the advantages of being capable of obviously increasing the field angle of the external lens, good in imaging quality, low in production cost, suitable for occasions such as vehicles and mobile phone external lenses, and high in market value.
Description
Technical Field
The utility model relates to an optical system technical field, especially a high definition wide angle's external camera lens optical system.
Background
With the application fields of wide-angle lenses becoming more and more extensive, the demands of wide-angle lenses in the fields of photography, security monitoring, medicine, vehicle-mounted and the like are rising continuously, and in order to meet the requirements of wide field angles, the miniaturization and the light weight can be met by increasing the number of lens pieces, but the occupied space is increased; most lenses of wide-angle imaging systems in the market at present are aspheric lenses, and the problems of high cost and high manufacturing difficulty are ignored due to the fact that only performance requirements are considered on one side, so that the problems of distortion, poor definition, insufficient offset of projection pictures, large chromatic aberration of edge pictures and the like appear on the pictures of the wide-angle imaging systems; in addition, when the wide-angle lens works in some complex environments, such as the refractive index of glass, the mechanical structure of the lens, etc., are also affected by temperature, and therefore, an improved technique for solving the problem in the prior art is needed.
Disclosure of Invention
In order to overcome the not enough of prior art, the utility model provides a high definition wide-angle external lens optical system that imaging quality is good, the wide angle number of degrees is high and with low costs.
The utility model provides a technical scheme that its technical problem adopted is:
a high-definition wide-angle external lens optical system is provided with a front negative group lens, a diaphragm and a positive rear group lens from an object side to an image side along an optical axis in sequence, wherein the front negative group lens comprises a first lens, a second lens and a third lens in sequence, the first lens and the second lens are meniscus lenses with negative focal power, the concave surfaces of the first lens and the second lens face the image side, and the third lens is a biconvex lens with positive focal power; the positive rear group lens sequentially comprises a fourth lens, a first cemented lens and a second cemented lens, wherein the fourth lens is a meniscus lens with positive focal power, the convex surface of the fourth lens faces the image side, the first cemented lens is a double-convex lens with positive focal power, the second cemented lens is a meniscus lens with positive focal power, and the convex surface of the second cemented lens faces the image side; the first lens, the second lens, the third lens, the fourth lens, the first cemented lens and the second cemented lens are all glass spherical lenses.
The air space between the first lens and the second lens is 1-2mm, the air space between the second lens and the third lens is 0.2-0.4mm, the air space between the third lens and the fourth lens is 0.38-0.42mm, the air space between the fourth lens and the first cemented lens is 0.05-0.15mm, and the air space between the first cemented lens and the second cemented lens is 0 mm.
The air space of the first lens and the second lens is 1.588mm, the air space of the second lens and the third lens is 0.306mm, the air space of the third lens and the fourth lens is 0.383mm, the air space of the fourth lens and the first cemented lens is 0.098mm, and the air space of the first cemented lens and the second cemented lens is 0 mm.
The first lens satisfies Nd1≧ 1.5, the second lens satisfying Nd2≧ 1.2, the third lens and the fourth lens both satisfy Nd3＝Nd4≧ 1.6, the first cemented lens satisfying Nd5≦ 1.7, said second cemented lens satisfying Nd6≧ 1.8, wherein Nd is the refractive index.
The refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the first cemented lens and the second cemented lens are respectively as follows: nd (neodymium)1＝1.62、Nd2＝1.49、Nd3＝1.90、Nd4＝1.80、Nd51.59 and Nd6＝1.92。
The first lens, the second lens, the third lens and the fourth lens respectively satisfy: -1.8 < f1/f＜-1.2，-3.8＜f2/f＜-3，1.5＜f3/f＜2，2.5＜f4F is less than 3, wherein f is the focal length of an optical system consisting of the front and negative lens groups and the positive and negative lens groups, f1Is the focal length of the first lens, f2Is the focal length of the second lens, f3Is the focal length of the third lens, f4Is the focal length of the fourth lens.
The first and second cemented lenses satisfy: -1 < f5/f6< -0.3, wherein f5Is the focal length of the first cemented lens, f6Is the focal length of the second cemented lens.
The external lens optical system meets the requirements that f is more than or equal to 2mm and less than or equal to 3mm, TT L is more than or equal to 15mm and less than or equal to 17mm, and TT L/f is more than 5 and less than 7, wherein f is the focal length of an optical system consisting of a front negative group lens and a positive back group lens, and TT L is the total length of the optical system consisting of the front negative group lens and the positive back group lens.
The utility model has the advantages that: the utility model discloses an adopt the optical system that glass spherical lens constitutes, not only can show the angle of vision that increases external camera lens, obtain bigger shooting range, imaging quality is preferred, and whole camera lens light path total length is shorter moreover, and lens quantity is few, and is small, and the back is burnt moderate, can also cooperate with the camera of trigger interface to use to manufacturing cost has been reduced; in addition, the external lens optical system has compact structure and reasonable design, is suitable for occasions such as vehicle-mounted driving monitoring, backing monitoring, mobile phone external lenses and the like, has excellent cost performance and has high market value.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the optical structure of the present invention.
Detailed Description
Referring to fig. 1, a high-definition wide-angle external lens optical system is provided with a front and negative group lens, a diaphragm 1 and a positive and negative group lens in sequence from an object side to an image side along an optical axis, and light rays of the external lens optical system in an incident direction sequentially pass through the front and negative group lens, the diaphragm 1 and the positive and negative group lens and then are imaged on an image plane; the front negative group lens sequentially comprises a first lens 2, a second lens 3 and a third lens 4, the first lens 2 and the second lens 3 are negative meniscus lenses, the concave surfaces of the first lens 2 and the second lens 3 face the image side, and the third lens 4 is a positive biconvex lens; the positive rear group lens sequentially comprises a fourth lens 5, a first cemented lens 6 and a second cemented lens 7, wherein the fourth lens 5 is a meniscus lens with positive focal power, the convex surface of the fourth lens 5 faces the image side, the first cemented lens 6 is a biconvex lens with positive focal power, the second cemented lens 7 is a meniscus lens with positive focal power, and the convex surface of the second cemented lens 7 faces the image side; the image surfaces of the first lens 2 and the second lens 3 face the diaphragm 1, the object surfaces of the fourth lens 5 and the second cemented lens 7 face the diaphragm 1, and the diaphragm 1 is positioned between the third lens 4 and the fourth lens 5; the first lens 2, the second lens 3, the third lens 4, the fourth lens 5, the first cemented lens 6 and the second cemented lens 7 are all glass spherical lenses; by adopting the optical system consisting of the glass spherical lens, the field angle of the external lens can be obviously increased, a larger shooting range is obtained, the imaging quality is better, the total optical path length of the whole lens is shorter, the number of the lenses is small, the size is small, the back focus is moderate, and the optical system can be matched with a camera of a trigger interface for use, so that the production cost is reduced; in addition, the external lens optical system has compact structure and reasonable design, is suitable for occasions such as vehicle-mounted driving monitoring, backing monitoring, mobile phone external lenses and the like, has excellent cost performance and has high market value.
The air space between the first lens 2 and the second lens 3 is 1-2mm, the air space between the second lens 3 and the third lens 4 is 0.2-0.4mm, the air space between the third lens 4 and the fourth lens 5 is 0.38-0.42mm, the air space between the fourth lens 5 and the first cemented lens 6 is 0.05-0.15mm, and the air space between the first cemented lens 6 and the second cemented lens 7 is 0 mm.
The air space between the first lens 2 and the second lens 3 is 1.588mm, the air space between the second lens 3 and the third lens 4 is 0.306mm, the air space between the third lens 4 and the fourth lens 5 is 0.383mm, the air space between the fourth lens 5 and the first cemented lens 6 is 0.098mm, and the air space between the first cemented lens 6 and the second cemented lens 7 is 0 mm.
The first lens 2 satisfies Nd1≧ 1.5, the second lens 3 satisfying Nd2≧ 1.2, the third lens 4 and the fourth lens 5 both satisfy Nd3＝Nd4≧ 1.6, the first cemented lens 6 satisfying Nd5≦ 1.7, said second cemented lens 7 satisfying Nd6≧ 1.8, wherein Nd is the refractive index.
The refractive index and the dispersion coefficient of the first lens 2, the second lens 3, the third lens 4, the fourth lens 5, the first cemented lens 6 and the second cemented lens 7 are respectively as follows: nd (neodymium)1＝1.62、Vd1＝60，Nd2＝1.49、Vd2＝70，Nd3＝1.90、Vd3＝45，Nd4＝1.80、Vd4＝70，Nd5＝1.59、Vd5＝70，Nd6＝1.92、Vd6Where Vd is the abbe number 25.
The first lens 2, the second lens 3, the third lens 4 and the fourth lens 5 respectively satisfy: -1.8 < f1/f＜-1.2，-3.8＜f2/f＜-3，1.5＜f3/f＜2，2.5＜f4F is less than 3, wherein f is the focal length of an optical system consisting of the front and negative lens groups and the positive and negative lens groups, f1Is the focal length of the first lens 2, f2Is the focal length of the second lens 3, f3Is the focal length of the third lens 4, f4Is the focal length of the fourth lens 5.
The first cemented lens 6 and the second cemented lens 7 satisfy: -1 < f5/f6< -0.3, wherein f5Is the focal length of the first cemented lens 6, f6Is the focal length of the second cemented lens 7.
The parameters of each lens are shown in the following table:
in the above table, the front surface viewed from the object side to the image side is the first row parameter in the first lens element 2, the front surface viewed from the image side to the object side is the second row parameter in the first lens element 2, and the parameters of the remaining items of the second lens element 3, the third lens element 4, the fourth lens element 5, the first cemented lens element 6 and the second cemented lens element 7 are analogized in sequence.
The external lens optical system meets the requirements that f is more than or equal to 2mm and less than or equal to 3mm, TT L is more than or equal to 15mm and less than or equal to 17mm, and TT L/f is more than 5 and less than 7, wherein f is the focal length of an optical system consisting of a front negative group lens and a positive back group lens, and TT L is the total length of the optical system consisting of the front negative group lens and the positive back group lens.
In the embodiment, the external lens optical system has a 100-degree range of field angle, is clear in imaging and small in distortion, and can be widely applied to electronic products such as mobile phones and tablet computers.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (8)
1. A high-definition wide-angle external lens optical system is provided with a front negative group lens, a diaphragm (1) and a positive back group lens in sequence from an object side to an image side along an optical axis, and is characterized in that the front negative group lens comprises a first lens (2), a second lens (3) and a third lens (4) in sequence, the first lens (2) and the second lens (3) are both negative meniscus lenses, the concave surfaces of the first lens (2) and the second lens (3) face the image side, and the third lens (4) is a positive biconvex lens; the positive rear group lens sequentially comprises a fourth lens (5), a first cemented lens (6) and a second cemented lens (7), wherein the fourth lens (5) is a meniscus lens with positive focal power, the convex surface of the fourth lens (5) faces the image side, the first cemented lens (6) is a biconvex lens with positive focal power, the second cemented lens (7) is a meniscus lens with positive focal power, and the convex surface of the second cemented lens (7) faces the image side; the first lens (2), the second lens (3), the third lens (4), the fourth lens (5), the first cemented lens (6) and the second cemented lens (7) are all glass spherical lenses.
2. The external lens optical system for high definition and wide angle of claim 1, wherein the air space between the first lens (2) and the second lens (3) is 1-2mm, the air space between the second lens (3) and the third lens (4) is 0.2-0.4mm, the air space between the third lens (4) and the fourth lens (5) is 0.38-0.42mm, the air space between the fourth lens (5) and the first cemented lens (6) is 0.05-0.15mm, and the air space between the first cemented lens (6) and the second cemented lens (7) is 0 mm.
3. The external lens optical system for high definition and wide angle of claim 2, characterized in that the air space of the first lens (2) and the second lens (3) is 1.588mm, the air space of the second lens (3) and the third lens (4) is 0.306mm, the air space of the third lens (4) and the fourth lens (5) is 0.383mm, the air space of the fourth lens (5) and the first cemented lens (6) is 0.098mm, and the air space of the first cemented lens (6) and the second cemented lens (7) is 0 mm.
4. The high-definition wide-angle external lens optical system as defined in claim 1, wherein the first lens (2) satisfies Nd1≧ 1.5, the second lens (3) fullFoot Nd2≧ 1.2, the third lens (4) and the fourth lens (5) each satisfying Nd3= Nd4≧ 1.6, the first cemented lens (6) satisfying Nd5≦ 1.7, said second cemented lens (7) satisfying Nd6≧ 1.8, wherein Nd is the refractive index.
5. The external lens optical system with high definition and wide angle according to claim 4, characterized in that the refractive indexes of the first lens (2), the second lens (3), the third lens (4), the fourth lens (5), the first cemented lens (6) and the second cemented lens (7) are respectively: nd (neodymium)1=1.62、Nd2=1.49、Nd3=1.90、Nd4=1.80、Nd5=1.59 and Nd6=1.92。
6. The external lens optical system with high definition and wide angle according to claim 1, characterized in that the first lens (2), the second lens (3), the third lens (4) and the fourth lens (5) respectively satisfy: -1.8 < f1/f＜-1.2，-3.8＜f2/f＜-3，1.5＜f3/f＜2，2.5＜f4F is less than 3, wherein f is the focal length of an optical system consisting of the front and negative lens groups and the positive and negative lens groups, f1Is the focal length of the first lens (2), f2Is the focal length of the second lens (3), f3Is the focal length of the third lens (4), f4Is the focal length of the fourth lens (5).
7. The high-definition wide-angle external lens optical system according to claim 1, wherein the first and second cemented lenses (6, 7) satisfy: -1 < f5/f6< -0.3, wherein f5Is the focal length of the first cemented lens (6), f6Is the focal length of the second cemented lens (7).
8. The external lens optical system with high definition and wide angle of claim 1, wherein f is 2mm or more and is 3mm or less, TT L is 15mm or more and is 17mm or less, and 5 is TT L/f is 7, wherein f is the focal length of the optical system consisting of the front and negative lens groups and the positive and negative lens groups, and TT L is the total length of the optical system consisting of the front and negative lens groups and the positive and negative lens groups.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493487.2U CN211014814U (en) | 2019-12-30 | 2019-12-30 | High-definition wide-angle external lens optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493487.2U CN211014814U (en) | 2019-12-30 | 2019-12-30 | High-definition wide-angle external lens optical system |
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| Publication Number | Publication Date |
|---|---|
| CN211014814U true CN211014814U (en) | 2020-07-14 |
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|---|---|---|---|
| CN201922493487.2U Expired - Fee Related CN211014814U (en) | 2019-12-30 | 2019-12-30 | High-definition wide-angle external lens optical system |
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| CN (1) | CN211014814U (en) |
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- 2019-12-30 CN CN201922493487.2U patent/CN211014814U/en not_active Expired - Fee Related
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Granted publication date: 20200714 |