CN108594402B - Vehicle-mounted lens - Google Patents
Vehicle-mounted lens Download PDFInfo
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- CN108594402B CN108594402B CN201810771948.5A CN201810771948A CN108594402B CN 108594402 B CN108594402 B CN 108594402B CN 201810771948 A CN201810771948 A CN 201810771948A CN 108594402 B CN108594402 B CN 108594402B
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- 230000003287 optical effect Effects 0.000 claims abstract description 80
- 238000003384 imaging method Methods 0.000 claims abstract description 41
- 239000011521 glass Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 12
- 238000012546 transfer Methods 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003678 scratch resistant effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003137 locomotive effect Effects 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
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention relates to a vehicle-mounted lens, comprising: a first lens group having negative optical power; a second lens group arranged with the first lens group along a main optical axis, the second lens group having positive optical power; the diaphragm is arranged between the first lens group and the second lens group, and the through hole of the diaphragm is arranged on the main optical axis; the imaging surface is arranged on one side of the second lens group away from the first lens group; the first lens group and the second lens group satisfy the following conditions: -2.5 is more than or equal to Fa/Fb is more than or equal to-25; wherein Fa is the combined focal length value of the first lens group, fb is the combined focal length value of the second lens group. The vehicle-mounted lens meeting the conditions has the characteristics of clear image, 160 degrees or more of horizontal view field and good imaging quality.
Description
Technical Field
The present invention relates to imaging technology, and in particular, to a vehicle lens.
Background
In recent years, with the increasing demand of people for safe driving of locomotives, the on-board lens has been rapidly developed. In-vehicle lenses are used to provide monitoring of the environment inside and outside the cabin, and generally require a large viewing angle.
The inventors found in the process of implementing the conventional technology that: the traditional vehicle-mounted lens is usually not clear enough in image, and the requirement of people on the vehicle-mounted lens is difficult to meet.
Disclosure of Invention
Based on this, it is necessary to provide a vehicle-mounted lens for the problem that the influence of the conventional vehicle-mounted lens is not clear enough.
An in-vehicle lens comprising: a first lens group having negative optical power; a second lens group arranged with the first lens group along a main optical axis, the second lens group having positive optical power; the diaphragm is arranged between the first lens group and the second lens group, and the through hole of the diaphragm is arranged on the main optical axis; the imaging surface is arranged on one side of the second lens group away from the first lens group; the first lens group and the second lens group satisfy the following conditions: -2.5 is more than or equal to Fa/Fb is more than or equal to-25; wherein Fa is the combined focal length value of the first lens group, fb is the combined focal length value of the second lens group.
The vehicle-mounted lens comprises a first lens group and a second lens group. Wherein, the ratio of the combined focal length value of the first lens group to the combined focal length value of the second lens group is more than or equal to-2.5 and more than or equal to Fa/Fb and more than or equal to-25. Based on the focal length ratio, the vehicle-mounted lens has the characteristics of clear image, 160 degrees or more of horizontal view field and good imaging quality.
In one embodiment, the first lens group of the in-vehicle lens further satisfies the following condition: -8.5mm is more than or equal to Fa is more than or equal to-100 mm; -8.5 is more than or equal to Fa/F is more than or equal to-80; and F is the whole set of focal length values of the vehicle-mounted lens.
In one embodiment, the first lens group of the in-vehicle lens includes, in order from an object side to an imaging surface: a first lens having negative optical power, a first side surface of the first lens protruding toward the object side, a second side surface of the first lens being concave toward the first lens; a second lens having negative optical power, a first side of the second lens protruding toward the first lens, a second side of the second lens being recessed inward of the second lens; a third lens having positive optical power, a first side surface of the third lens protruding toward the second lens, a second side surface of the second lens protruding toward the imaging surface; the first lens, the second lens and the third lens are arranged with a main optical axis.
In one embodiment, the first lens of the in-vehicle lens further satisfies the following condition: n1 is less than or equal to 1.75, and V1 is more than or equal to 50; wherein, N1 is the light refractive index of the first lens, and V1 is the Abbe number of the first lens; the second lens also satisfies the following condition: n2 is more than or equal to 1.5, and V2 is more than or equal to 50; wherein N2 is the optical refractive index of the second lens, and V2 is the abbe number of the second lens; the third lens also satisfies the following condition: n3 is more than or equal to 1.6, and V3 is less than or equal to 25; wherein N3 is the refractive index of light of the third lens, and V3 is the abbe number of the third lens.
In one embodiment, the second lens group of the in-vehicle lens further satisfies the following condition: fb is more than or equal to 5mm and more than or equal to 2.5mm; 5. Fb/F is more than or equal to 2.5; and F is the whole set of focal length values of the vehicle-mounted lens.
In one embodiment, the second lens group of the in-vehicle lens includes, in order from an object side to an imaging surface: a fourth lens having negative optical power, a first side of the fourth lens protruding toward the aperture, a second side of the fourth lens being concave inward toward the fourth lens; a fifth lens having positive optical power, a first side surface of the fifth lens protruding toward the fourth lens, and a second side surface of the fifth lens protruding toward the imaging surface; the fourth lens and the fifth lens are arranged with the main optical axis.
In one embodiment, the fourth lens of the in-vehicle lens further satisfies the following condition: n4 is more than or equal to 1.6, and V4 is less than or equal to 25; wherein, N4 is the light refractive index of the fourth lens, and V4 is the abbe number of the fourth lens; the fifth lens further satisfies the following condition: n5 is more than or equal to 1.5, and V5 is more than or equal to 50; wherein N5 is the optical refractive index of the fifth lens, and V5 is the abbe number of the fifth lens.
In one embodiment, the material of the first lens of the in-vehicle lens includes a glass lens, and the material of the second lens, the third lens, the fourth lens, and the fifth lens includes a plastic lens.
According to the vehicle-mounted lens, the material of the first lens close to the object side surface is set to be the glass lens, so that the fireproof, high-temperature resistant, high-humidity resistant and scratch resistant capabilities of the vehicle-mounted lens can be improved, the adaptation requirement of the vehicle-mounted lens to temperature change is met, and the adaptation of the vehicle-mounted lens to severe environments can be improved. The second lens, the third lens, the fourth lens and the fifth lens which are far away from the object side are arranged as plastic lenses, so that the total weight of the vehicle-mounted lens can be reduced.
In one embodiment, the in-vehicle lens further satisfies the following condition: 21mm is more than or equal to TTL is more than or equal to 10mm; wherein the TTL represents the optical length of the vehicle-mounted lens from the first lens group to the imaging surface.
In one embodiment, the in-vehicle lens further includes: the optical filter is arranged between the second lens group and the imaging surface.
The vehicle-mounted lens meeting the conditions has the advantages of small volume, light weight, clear image, short total optical length and horizontal view field of more than 160 degrees.
Drawings
Fig. 1 is a schematic diagram of the shape and the positional relationship of optical elements constituting an in-vehicle lens according to an embodiment of the present application.
Fig. 2 is a schematic diagram showing the shape and the positional relationship of optical elements constituting the in-vehicle lens according to another embodiment of the present application.
Fig. 3 is a graph of a modulation transfer function characteristic of an in-vehicle lens according to an embodiment of the present application.
Fig. 4 is a meridian field curve, a sagittal field curve, and a distortion curve of an in-vehicle lens according to an embodiment of the present application.
Fig. 5 is a light fan diagram of the vehicle lens when the object plane angle is 0 in an embodiment of the present application.
Fig. 6 is a light fan diagram of the vehicle lens when the object plane angle is 40 degrees in an embodiment of the present application.
Fig. 7 is a light fan diagram of the vehicle lens when the object plane angle is 60 degrees in an embodiment of the present application.
Fig. 8 is a light fan diagram of the vehicle lens when the object plane angle is 99 degrees in an embodiment of the present application.
Fig. 9 is a graph of chromatic aberration of an in-vehicle lens according to an embodiment of the present application.
Wherein the meanings represented by the reference numerals are as follows:
100. first lens group
110. First lens
112. First side of the first lens
114. Second side of the first lens
120. Second lens
122. First side of the second lens
124. A second side of the second lens
130. Third lens
132. First side of third lens
134. Second side of the third lens
200. Second lens group
210. Fourth lens
212. First side of fourth lens
214. Second side of fourth lens
220. Fifth lens
222. First side of fifth lens
224. Second side of the fifth lens
300. Diaphragm
400. Imaging surface
500. Optical filter
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
The application provides a vehicle-mounted lens, as shown in fig. 1, including a first lens group 100, a second lens group 200, a diaphragm 300 disposed between the first lens group 100 and the second lens group 200, and an imaging plane 400.
Specifically, the first lens group 100 has negative optical power. The first lens group 100 may include a plurality of optical lenses, thereby forming a lens group. The first lens group 100 should be disposed on the object side, i.e. the side closer to the object.
The second lens group 200 has positive optical power. The second lens group 200 may also include a plurality of optical lenses, thereby forming another lens group. The second lens group 200 should be disposed with the primary optical axis as the first lens group 100. Meanwhile, the second lens group 200 should be disposed on a side close to the imaging plane 400.
The diaphragm 300 is disposed between the first lens group 100 and the second lens group 200. The aperture 300 may be an aperture 300, and the light-passing hole of the aperture 300 should be disposed on the main optical axis of the first lens group 100 and the second lens group 200.
The imaging surface 400 is disposed on one side of the second lens group 200, and the imaging surface 400 is far away from the first lens group 100 and the diaphragm 300.
The first lens group 100 and the second lens group 200 of the vehicle-mounted lens further satisfy the following conditions:
-2.5≥Fa/Fb≥-25；
wherein Fa is the combined focal length value of the first lens group 100, fb is the combined focal length value of the second lens group 200.
More specifically, the vehicle lens includes a first lens group 100, a diaphragm 300, a second lens group 200, and an imaging plane 400, which are disposed in order from an object side to the imaging plane 400 and on the same main optical axis. Wherein the first lens group 100 has negative optical power and the second lens group 200 has positive optical power. And the combined focal length value Fa of the first lens group 100 and the combined focal length value Fb of the second lens group 200 meet-2.5 being more than or equal to Fa/Fb being more than or equal to-25.
The vehicle-mounted lens comprises a first lens group and a second lens group. Wherein, the ratio of the combined focal length value of the first lens group to the combined focal length value of the second lens group is more than or equal to-2.5 and more than or equal to Fa/Fb and more than or equal to-25. Based on the focal length ratio, the vehicle-mounted lens has the characteristics of clear image, 160 degrees or more of horizontal view field and good imaging quality.
In one embodiment, the first lens group 100 of the in-vehicle lens further satisfies the following conditions:
-8.5mm≥Fa≥-100mm；-8.5≥Fa/F≥-80；
here, fa is a combined focal length value of the first lens group 100, and F is an entire set of focal length values of the vehicle lens. The combined focal length value Fa of the first lens group 100 is negative, and the overall focal length value F of the in-vehicle lens is positive.
The second lens group 200 also satisfies the following conditions:
5mm≥Fb≥2.5mm；5≥Fb/F≥2.5；
fb is a combined focal length value of the second lens group 200, and F is a whole set of focal length values of the vehicle lens. The combined focal length Fb of the second lens group 200 is positive, and the overall focal length F of the vehicle lens is positive.
In one embodiment, as shown in fig. 2, the vehicle lens assembly 100 includes, in order from an object side to an imaging surface 400: the first lens 110, the second lens 120 and the third lens 130 should be disposed with the main optical axis, and the first lens 110, the second lens 120 and the third lens 130 should be disposed with the main optical axis.
Specifically, the first lens 110 has negative optical power. The first side 112 of the first lens protrudes toward the object side, and the first side 114 of the first lens is recessed into the first lens 110, so that the first lens 110 has negative optical power.
The second lens 120 also has negative optical power. Wherein the first side 122 of the second lens protrudes toward the first lens 110, and the second side 124 of the second lens is recessed toward the second lens 120, so that the second lens 120 has negative optical power.
The third lens 130 has positive optical power. Wherein the first side 132 of the third lens is convex toward the second lens 120 and the second side 134 of the third lens is convex toward the imaging surface 400, so that the third lens 130 has positive optical power.
Further, the first lens 110 should also satisfy the following conditions:
N1≤1.75，V1≥50；
where N1 is the optical refractive index of the first lens 110, and V1 is the abbe number of the first lens 110.
The second lens 120 should also satisfy the following conditions:
N2≥1.5，V2≥50；
where N2 is the optical refractive index of the second lens 120, and V2 is the abbe number of the second lens 120.
The third lens 130 should also satisfy the following conditions:
N3≥1.6，V3≤25；
where N3 is the optical refractive index of the third lens 130, and V3 is the abbe number of the third lens 130.
In one embodiment, as shown in fig. 2, the second lens group 200 of the vehicle lens includes, in order from an object side to an image side: the fourth lens 210 and the fifth lens 220, and the fourth lens 210 and the fifth lens 220 should be disposed with the main optical axis.
Specifically, the fourth lens 210 has negative optical power. The first side 212 of the fourth lens protrudes toward the diaphragm 300, i.e., toward the first lens 110, and the second side 214 of the fourth lens is recessed into the fourth lens 210, so that the fourth lens 210 has negative optical power.
The fifth lens 220 has positive optical power. The first side 222 of the fifth lens protrudes toward the fourth lens 210, and the second side 224 of the fifth lens protrudes toward the imaging surface 400, so that the fifth lens 220 has positive optical power.
Further, the fourth lens 210 should also satisfy the following conditions:
N4≥1.6，V4≤25；
where N4 is the optical refractive index of the fourth lens 210, and V4 is the abbe number of the fourth lens 210.
The fifth lens 220 should also satisfy the following conditions:
N5≥1.5，V5≥50；
where N5 is the optical refractive index of the fifth lens 220, and V5 is the abbe number of the fifth lens 220.
In one embodiment, the above-mentioned vehicle-mounted lens should also satisfy the following conditions:
21mm≥TTL≥10mm；
wherein TTL represents an optical length of the in-vehicle lens from the first lens group 100 to the imaging plane 400, that is, a vertical distance from a vertex of the first side 112 of the first lens group 100 to the imaging plane 400.
In one embodiment, the on-vehicle lens may be a spherical lens of glass. The second lens may be a high dispersion, plastic, aspheric lens. The third lens may be a low dispersion, plastic, aspheric lens. The fourth lens may be a low dispersion, plastic, aspheric lens. The fifth lens may be a high dispersion, plastic, aspheric lens.
Further, as shown in fig. 2, the second side 214 of the fourth lens and the first side 222 of the fifth lens may be attached to each other, so that the fourth lens 210 and the fifth lens 220 form a cemented lens.
Further, the second lens, the third lens, the fourth lens and the fifth lens of the vehicle lens are aspheric lenses, and any aspheric surface satisfies the following formula:
wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the height h along the main optical axis direction. c=1/r, c is the curvature of the aspherical pole, and r is the radius of curvature of the sphere. k is a quadric coefficient. A. B, C, D, E are higher order aspheric coefficients, respectively.
According to the vehicle-mounted lens, the material of the first lens close to the object side surface is set to be the glass lens, so that the fireproof, high-temperature resistant, high-humidity resistant and scratch resistant capabilities of the vehicle-mounted lens can be improved, the adaptation requirement of the vehicle-mounted lens to temperature change is met, and the adaptation of the vehicle-mounted lens to severe environments can be improved. The second lens, the third lens, the fourth lens and the fifth lens which are far away from the object side are arranged as plastic lenses, so that the total weight of the vehicle-mounted lens can be reduced.
In one embodiment, as shown in fig. 2, the on-vehicle lens further includes: the optical filter 500.
Specifically, the optical filter 500 is used for selecting an optical radiation band. The optical filter 500 is disposed between the second lens group 200 and the imaging plane 400, so that the light passes through the fourth lens 210 and the fifth lens 220 of the second lens group 200, then passes through the optical filter 500, and is projected onto the imaging plane 400.
In one embodiment, the above-mentioned vehicle-mounted lens further satisfies the following conditions:
arctan(y/F/(1+D))≥160°；
wherein y is the image height on the imaging plane, F is the whole set of focal length values of the vehicle-mounted lens, and D is the optical distortion value of the lens.
The vehicle-mounted lens meeting the conditions has the advantages of small volume, light weight, clear image, short total optical length and horizontal view field of more than 160 degrees.
In a specific embodiment, the application provides a vehicle-mounted lens, which comprises a first lens group, a diaphragm, a second lens group, a filter and an imaging surface, wherein the first lens group, the diaphragm, the second lens group, the filter and the imaging surface are sequentially arranged from an object side to the imaging surface. The first lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power. The second lens group comprises a fourth lens with negative focal power and a fifth lens with positive focal power, and the fourth lens and the fifth lens are glued into a whole. The first lens is a glass spherical lens, and the second lens, the third lens, the fourth lens and the fifth lens are plastic aspherical lenses.
In this embodiment, each side surface of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens satisfies the conditions described in the following table:
| face number | Radius of curvature r | Center thickness d | Refractive index N | Abbe number V |
| 112 | 15.5 | 1.0 | 1.73 | 55 |
| 114 | 2.9 | 1.2 | -- | -- |
| 122 | 3.5 | 0.5 | 1.54 | 56 |
| 124 | 1.1 | 1.7 | -- | -- |
| 132 | 5.1 | 1.5 | 1.64 | 24 |
| 134 | -4.9 | 0.6 | -- | -- |
| 300 | -- | 0.3 | -- | -- |
| 212 | 3.7 | 0.8 | 1.64 | 24 |
| 214 | 0.9 | 2.1 | 1.54 | 56 |
| 222 | -1.9 | 2.5 | -- | -- |
| 224 | -- | 0.3 | 1.52 | 54 |
| 500 | -- | -- | -- | -- |
| 600 | -- | -- | -- | -- |
The first side 122 of the second lens, the second side 124 of the second lens, the first side 132 of the third lens, the second side 134 of the third lens, the first side 212 of the fourth lens, the second side 214 of the fourth lens, the first side 222 of the fifth lens, and the second side 224 of the fifth lens are aspheric, and the aspheric coefficients k, A, B, C, D, E thereof are as shown in the following table:
in this embodiment, the vehicle-mounted lens satisfying the above condition has the entire group focal length value f=1.28 mm, the F-number fno=2.8, and the optical length TTL from the first lens group to the imaging surface=12.5 mm.
The vehicle-mounted lens in the embodiment is subjected to optical test, and the obtained optical modulation transfer function characteristic curve is shown in fig. 3; the field curvature characteristic curve and the distortion characteristic curve are shown in fig. 4; the obtained light fan diagrams are shown in fig. 5 to 8; the resulting color difference plot is shown in fig. 9.
Fig. 3 is an optical modulation transfer function characteristic curve obtained by the vehicle lens of the present embodiment, where the abscissa is a spatial frequency period of each millimeter, and the unit is line coupling/millimeter; the ordinate is the percentage of imaging quality approaching the physical condition. The curve (1) is the limit resolution of the vehicle lens. The curve (2) is a meridian field curve and a sagittal field curve of the vehicle-mounted lens when the view field angle is 0 degrees. The curve (3) is a sagittal field curve of the vehicle lens at a field angle of 50 degrees. And the curve (4) is a meridian field curve of the vehicle-mounted lens at a view field angle of 50 degrees. The curve (5) is a sagittal field curve of the vehicle lens at a field angle of 90 degrees. The curve (6) is a meridian field curve of the vehicle-mounted lens when the view field angle is 90 degrees. As can be seen from fig. 3, the modulation transfer function of the center field of view is greater than 0.5 at 1/2 frequency (Nyquist frequency), i.e., at half frequency in the present embodiment. The modulation transfer function of the 0.8 field of view is greater than 0.3. The remainder are between 0.3 and 0.5 based on the modulation transfer function of the field of view between the central field of view and 0.8 field of view.
In fig. 4, the left graph is a field curve characteristic curve, and the right graph is a distortion characteristic curve. In the field curvature characteristic curve, T is a meridian field curvature characteristic curve, and S is a sagittal field curvature characteristic curve. As can be seen from fig. 4, the meridian field curvature of the on-vehicle lens is controlled to be between-0.04 mm and 0.06mm, and the sagittal field curvature is controlled to be between-0.04 mm and 0.02 mm.
Fig. 5 to 8 are light fan diagrams of the in-vehicle lens in the present embodiment. Wherein, the F curve represents the color difference curve of the cyan light with the wavelength of 486.1nm in the vehicle-mounted lens, and the C curve represents the color difference curve of the red light with the wavelength of 656.3nm in the vehicle-mounted lens. The abscissa Py in each figure indicates that the aperture of the light ray of the object plane on the Y axis is high; px denotes that the ray aperture of the object plane in the X-axis is high. An ordinate eY in the drawings indicates the component phase difference of the image plane on the Y axis; eX represents the component phase difference of the image plane on the X-axis. Fig. 5 shows a light fan diagram of the vehicle lens when the object plane is 0 degrees, and it can be seen from the figure that when the object plane is 0 degrees, the component phase difference is almost unchanged along with the increase of the aperture height of the light rays, no matter in the X axis or the Y axis, and the imaging effect is good. Fig. 6 shows a light fan diagram of the on-vehicle lens when the object plane is 40 °, and it can be seen from the figure that when the object plane is 40 °, the component phase difference changes slightly with increasing light aperture height, both in the X-axis and the Y-axis. Fig. 7 shows a light fan diagram of the vehicle lens when the object plane is 60 degrees, and it can be seen from the figure that when the aperture of the light ray of the object plane on the Y axis is not large, the component phase difference of the image plane on the Y axis is small, and the imaging quality is good. And the component phase difference of the image plane on the X axis is smaller as the aperture of the light ray of the object plane on the X axis is high. Fig. 8 shows a light fan diagram of the vehicle lens when the object plane is 99 °, and it can be seen from the figure that the component phase difference of the image plane on the X axis is still not greatly changed with the increase of the aperture height of the light ray on the X axis of the object plane, and the component phase difference of the image plane on the Y axis is relatively greatly changed with the increase of the aperture height of the light ray on the Y axis of the object plane, and at this time, the distortion of the image plane on the Y axis is great.
Fig. 9 is a color difference graph of the in-vehicle lens in the present embodiment, wherein the F curve represents a color difference curve of cyan light of wavelength 486.1nm in the in-vehicle lens, the D curve represents a color difference curve of yellow light of wavelength 589.3nm in the in-vehicle lens, and the C curve represents a color difference curve of red light of wavelength 656.3nm in the in-vehicle lens. As can be seen from FIG. 6, the color difference range of cyan light is controlled to be between-0.035 mm and 0.005mm, the color difference range of yellow light is controlled to be between-0.03 mm and 0.01mm, and the color difference range of cyan light is controlled to be between-0.02 mm and 0.01 mm.
The vehicle-mounted lens in the specific embodiment has small optical distortion, clear influence and short optical total length of only 13.5 mm.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A vehicle-mounted lens, characterized by comprising:
a first lens group having negative optical power;
a second lens group arranged with the first lens group along a main optical axis, the second lens group having positive optical power;
the diaphragm is arranged between the first lens group and the second lens group, and the through hole of the diaphragm is arranged on the main optical axis;
the imaging surface is arranged on one side of the second lens group away from the first lens group;
the first lens group and the second lens group satisfy the following conditions:
-2.5≥Fa/Fb≥-25；
wherein Fa is the combined focal length value of the first lens group, fb is the combined focal length value of the second lens group;
the first lens also satisfies the following condition: n1 is less than or equal to 1.75, and V1 is more than or equal to 50; wherein, N1 is the light refractive index of the first lens, and V1 is the Abbe number of the first lens;
the second lens also satisfies the following condition: n2 is more than or equal to 1.5, and V2 is more than or equal to 50; wherein N2 is the optical refractive index of the second lens, and V2 is the abbe number of the second lens;
the third lens also satisfies the following condition: n3 is more than or equal to 1.6, and V3 is less than or equal to 25; wherein N3 is the refractive index of light of the third lens, and V3 is the abbe number of the third lens.
2. The vehicle lens according to claim 1, wherein the first lens group further satisfies the following condition:
-8.5mm≥Fa≥-100mm；-8.5≥Fa/F≥-80；
and F is the whole set of focal length values of the vehicle-mounted lens.
3. The vehicle-mounted lens according to claim 2, wherein the first lens group includes, in order from an object side to an imaging surface:
a first lens having negative optical power, a first side surface of the first lens protruding toward the object side, a second side surface of the first lens being concave toward the first lens;
a second lens having negative optical power, a first side of the second lens protruding toward the first lens, a second side of the second lens being recessed inward of the second lens;
a third lens having positive optical power, a first side surface of the third lens protruding toward the second lens, a second side surface of the second lens protruding toward the imaging surface;
the first lens, the second lens and the third lens are arranged with a main optical axis.
4. The in-vehicle lens according to claim 3, wherein the second lens group further satisfies the following condition:
5mm≥Fb≥2.5mm；5≥Fb/F≥2.5；
and F is the whole set of focal length values of the vehicle-mounted lens.
5. The vehicle-mounted lens according to claim 4, wherein the second lens group includes, in order from an object side to an imaging surface:
a fourth lens having negative optical power, a first side of the fourth lens protruding toward the aperture, a second side of the fourth lens being concave inward toward the fourth lens;
a fifth lens having positive optical power, a first side surface of the fifth lens protruding toward the fourth lens, and a second side surface of the fifth lens protruding toward the imaging surface;
the fourth lens and the fifth lens are arranged with the main optical axis.
6. The in-vehicle lens according to claim 5, wherein the fourth lens further satisfies the following condition: n4 is more than or equal to 1.6, and V4 is less than or equal to 25; wherein, N4 is the light refractive index of the fourth lens, and V4 is the abbe number of the fourth lens;
the fifth lens further satisfies the following condition: n5 is more than or equal to 1.5, and V5 is more than or equal to 50; wherein N5 is the optical refractive index of the fifth lens, and V5 is the abbe number of the fifth lens.
7. The vehicle lens of claim 5, wherein the material of the first lens comprises a glass lens, and the material of the second lens, the third lens, the fourth lens, and the fifth lens comprises a plastic lens.
8. The in-vehicle lens according to any one of claims 1 to 7, characterized in that the in-vehicle lens further satisfies the following condition:
21mm≥TTL≥10mm；
wherein the TTL represents the optical length of the vehicle-mounted lens from the first lens group to the imaging surface.
9. The in-vehicle lens according to any one of claims 1 to 7, characterized in that the in-vehicle lens further comprises:
the optical filter is arranged between the second lens group and the imaging surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771948.5A CN108594402B (en) | 2018-07-13 | 2018-07-13 | Vehicle-mounted lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771948.5A CN108594402B (en) | 2018-07-13 | 2018-07-13 | Vehicle-mounted lens |
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| Publication Number | Publication Date |
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| CN108594402A CN108594402A (en) | 2018-09-28 |
| CN108594402B true CN108594402B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810771948.5A Active CN108594402B (en) | 2018-07-13 | 2018-07-13 | Vehicle-mounted lens |
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| Country | Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109975960A (en) * | 2019-04-25 | 2019-07-05 | 协益电子（苏州）有限公司 | One kind looking around wide-angle without thermalization camera lens and automobile panoramic round-looking system |
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| JPS5862608A (en) * | 1981-10-12 | 1983-04-14 | Minolta Camera Co Ltd | Wide angle lens having short-overall length |
| CN101587231A (en) * | 2009-06-09 | 2009-11-25 | 宁波舜宇车载光学技术有限公司 | Megapixels large aperture vehicle front view lens |
| CN101614864A (en) * | 2009-06-09 | 2009-12-30 | 宁波舜宇车载光学技术有限公司 | Super wide angle mega pixel vehicle-mounted lens |
| CN206039008U (en) * | 2016-08-24 | 2017-03-22 | 协益电子（苏州）有限公司 | Optical lens and on -vehicle camera lens subassembly |
| CN208444071U (en) * | 2018-07-13 | 2019-01-29 | 协益电子（苏州）有限公司 | On-vehicle lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3594088B1 (en) * | 2004-06-02 | 2004-11-24 | マイルストーン株式会社 | Imaging lens |
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2018
- 2018-07-13 CN CN201810771948.5A patent/CN108594402B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5862608A (en) * | 1981-10-12 | 1983-04-14 | Minolta Camera Co Ltd | Wide angle lens having short-overall length |
| CN101587231A (en) * | 2009-06-09 | 2009-11-25 | 宁波舜宇车载光学技术有限公司 | Megapixels large aperture vehicle front view lens |
| CN101614864A (en) * | 2009-06-09 | 2009-12-30 | 宁波舜宇车载光学技术有限公司 | Super wide angle mega pixel vehicle-mounted lens |
| CN206039008U (en) * | 2016-08-24 | 2017-03-22 | 协益电子（苏州）有限公司 | Optical lens and on -vehicle camera lens subassembly |
| CN208444071U (en) * | 2018-07-13 | 2019-01-29 | 协益电子（苏州）有限公司 | On-vehicle lens |
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| CN108594402A (en) | 2018-09-28 |
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