CN206710686U - A kind of optical lens of compact - Google Patents

Abstract

The utility model discloses a compact optical lens, which comprises a lens group, a diaphragm and an IR filter, the diaphragm is located in front of the lens group, and the IR filter is located in the lens The rear of the group; the lens group includes six lens units, and the six lens units include at least two cemented lens groups and one glass aspheric lens. The optical lens of the utility model realizes large aperture, high brightness and high-definition resolution while greatly reducing the total optical length of the lens; and at least includes two cemented lenses and a glass aspherical lens, and the arrangement of the two cemented lenses can effectively reduce the Imaging chromatic aberration makes the lens have excellent color reproduction ability; aspheric glass can effectively shorten the total optical length of the lens, compensate and correct spherical aberration, field curvature and other aberrations, so that the center and edge imaging of the lens can achieve high-definition effects; the aperture is set on the lens The front of the group not only ensures the high brightness of the lens, but also reduces the tolerance sensitivity of the lens, effectively improving the production yield.

Description

A compact optical lens

technical field

The utility model relates to the field of optical lenses, in particular to a compact optical lens.

Background technique

Optical lens is an essential part of machine vision system, which directly affects the quality of imaging. This lens has been widely used in various fields. With the advancement of technology and the continuous improvement of market demand, the automotive ADAS field requires optical lenses to have a large aperture and high resolution, and at the same time require a more compact size, so that they can be used in some locations with limited installation size, such as near the car rearview mirror. etc., while improving the overall aesthetics. The total optical length of the lens in the prior art is too long, and the diameter of the front port of the lens is too large, resulting in too large overall volume, which cannot meet the market demand.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a compact lens with a large aperture that meets the current market demand for miniaturization and high-definition development of vehicle-mounted products, and can realize blind spot detection during driving. In line with the development trend of vehicle products.

In order to achieve the above purpose, the utility model provides a compact optical lens, the specific technical solution is: comprising a lens group, a diaphragm and an IR filter, the diaphragm is located in front of the lens group, the The IR filter is located behind the lens group; the lens group includes six lens units, and the six lens units include at least two cemented lens groups and a glass aspheric lens.

Preferably, the six lens units are divided into two groups, the first group includes at least five lens units and at least two cemented lens groups, and the second group includes at least one glass aspheric lens The focal length of the entire optical lens is f, and the focal lengths of the first group and the second group are respectively f1 and f2; the focal length f1 of the first group and the focal length f of the optical lens satisfy: 1<f1/f<2 ; The focal length f2 of the second group and the focal length f of the optical lens satisfy: 2<f2/f<8.

Preferably, the first group includes two groups of cemented lenses and a lens unit; the lens unit is located in the middle of the two groups of cemented lenses or at the rear end of the two groups of cemented lenses.

Preferably, the second group includes a lens unit, the lens unit is a meniscus glass aspheric lens, the concave surface of the meniscus glass aspheric lens faces the direction of the imaging surface, and the focal power is burden.

Preferably, the total length of the optical lens is L; the focal length f of the optical lens and the total optical length L of the lens satisfy: 1.5<L/f<2.5.

Preferably, the maximum imaging angle of view FOV range of the optical lens satisfies: 30º<FOV<90º.

Preferably, the surface type of the glass aspheric lens satisfies:

Z=cy2/{1+[1-(1+k)c2y2]1/2}+a1y2+a2y4+a3y6+a4y8+a5y10+a6y12+a7y14+a8y16; the parameter c is the curvature corresponding to the radius, y is a radial coordinate; the unit of the radial coordinate is the same as the length unit of the lens unit; k is the conic conic coefficient; when k is less than -1, the surface curve is a hyperbola; when k is equal to -1 , the surface curve is a parabola; when k is between -1 and 0, the surface curve is an ellipse; when k is equal to 0, the surface shape is a circle; when k is greater than 0, the surface shape is an oblate curve ; The a1-a8 respectively represent the coefficients corresponding to the radial coordinates.

The beneficial effect that the utility model realizes mainly contains the following points:

1. This lens achieves large aperture, high brightness and high-definition resolution while greatly reducing the total optical length of the lens;

2. Novel structure, using six glass lenses, including at least two cemented lenses and one aspheric glass lens: two cemented lenses can effectively reduce imaging chromatic aberration, so that the lens has excellent color reproduction ability; aspheric glass can effectively Shorten the total optical length of the lens, compensate and correct spherical aberration, field curvature and other aberrations, so that both the center and edge of the lens can achieve high-definition images; setting the diaphragm in front of the lens group not only ensures the high brightness of the lens, but also reduces the lens tolerance Sensitivity, effectively improving the production yield;

3. Since all the lenses of the optical lens are made of glass, the change is small in high and low temperature environments, which effectively ensures the resolution capability of the lens in the range of ambient temperature (-40°C-95°C), thus meeting the requirements of TS16949 for vehicle-mounted products requirements.

Description of drawings

Fig. 1 is the structural representation of the compact optical lens of the utility model embodiment 1;

Fig. 2 is the MTF curve diagram of the compact optical lens shown in Fig. 1;

Fig. 3 is a spot diagram of the compact optical lens shown in Fig. 1;

Figure 4 is a field curvature and distortion diagram of the compact optical lens shown in Figure 1;

Fig. 5 is the structural representation of the compact optical lens of the utility model embodiment 2;

Fig. 6 is the MTF curve diagram of the compact optical lens shown in Fig. 5;

Fig. 7 is a spot diagram of the compact optical lens shown in Fig. 5;

FIG. 8 is a diagram of field curvature and distortion of the compact optical lens shown in FIG. 5 .

Explanation of reference signs:

G1: the first lens unit;

G2: the second lens unit;

G3: the third lens unit;

G4: the fourth lens unit;

G5: fifth lens unit;

G6: sixth lens unit;

111: the first group;

222: second group;

L1 is the first cemented lens;

L2 is the second cemented lens;

S1: diaphragm surface;

S2: second side;

S3: the third side;

S4: the fourth side;

S5: fifth side;

S6: the sixth side;

S7: the seventh side;

S8: the eighth side;

S9: the ninth side;

S10: the tenth side;

S11: the eleventh side;

S12: the twelfth side;

S13: the thirteenth side;

Image: imaging surface;

OBJ: object plane;

F: lens focal length value;

L: total optical length;

FOV: Field of view.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

In order to facilitate the understanding of those skilled in the art, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The optical lens of the present utility model comprises a lens group, a diaphragm and an IR filter, and the lens group adopts six lens units, which are respectively the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, the first lens unit, and the second lens unit. Five lens units and the sixth lens unit; the diaphragm is located at the forefront of the lens group, that is, before the first lens unit; the IR filter is located at the rear of the lens group, that is, after the sixth lens unit; the optical lens realizes a large While the aperture has high brightness and high-definition resolution, the total optical length of the lens is greatly reduced; the six lens units include at least two cemented lens groups and one glass aspheric lens. The setting of two sets of cemented lenses can effectively reduce the imaging chromatic aberration, so that the lens has excellent color reproduction ability; the aspheric glass can effectively shorten the total optical length of the lens, compensate and correct spherical aberration, field curvature and other aberrations, so that the center and edge of the lens can image High-definition effect; setting the diaphragm in front of the lens group not only ensures the high brightness of the lens, but also reduces the tolerance sensitivity of the lens, effectively improving the production yield.

The lens group includes a first group and a second group, the first group includes two groups of cemented lenses and a lens unit; the lens unit is located in the middle of the two groups of cemented lenses or at the rear end of the two groups of cemented lenses. The second group includes a lens unit, the lens unit is a meniscus glass aspheric lens, and the concave surface of the meniscus glass aspheric lens faces the direction of the imaging surface, and the refractive power is negative.

The focal length of the entire optical lens is f, the total optical length is L, the focal lengths of the first group and the second group are f1mm and f2mm respectively, the focal length f1 of the first group and the focal length f of the optical lens satisfy: 1<f1/f<2; The focal length f2 of the second group and the focal length f of the optical lens meet: 2<f2/f<8; and the focal length f of the optical lens and the total optical length L of the lens meet: 1.5<L/f<2.5; the maximum imaging angle of view FOV range of the optical lens satisfies : 30º<FOV<90º; aspherical lens surface type meets:

Z=cy2/{1+[1-(1+k)c2y2]1/2}+a1y2+a2y4+a3y6+a4y8+a5y10+a6y12+a7y14+a8y16, where the parameter c is the curvature corresponding to the radius, y is the radial coordinate; the unit of the radial coordinate is the same as the length unit of the lens unit; k is the conic conic coefficient; when k is less than -1, the surface curve is a hyperbola; when k is equal to -1 , the surface curve is a parabola; when k is between -1 and 0, the surface curve is an ellipse; when k is equal to 0, the surface shape is a circle; when k is greater than 0, the surface shape is an oblate curve ; The a1-a8 respectively represent the coefficients corresponding to the radial coordinates.

Combined with the above parameters, the utility model has designed two lenses, and its specific structure and parameters are as follows:

Example 1

As shown in FIG. 1 , it is a structural schematic diagram of a compact optical lens according to Embodiment 1 of the present utility model.

A compact optical lens, which includes a diaphragm surface (S1) arranged sequentially from the object side; a first lens unit (G1) and a second lens unit (G2) combined into a cemented lens (L1), including the second surface (S2), the third surface (S3), the fourth surface (S4); the third lens unit (G3), including the fifth surface (S5), the sixth surface (S6); the fourth lens unit (G4) and the The five lens units (G5) are combined into a cemented lens (L2), including the seventh surface (S7), the eighth surface (S8), and the ninth surface (S9); the sixth lens unit (G6), including the tenth surface (S10 ), the eleventh surface (S11); the filter (G8), including the twelfth surface (S12), the thirteenth surface (S13); the imaging surface (Image).

The compact optical lens is divided into the first group and the second group, the first group includes the first lens unit (G1), the second lens unit (G2), the third lens unit (G3), the fourth lens unit (G4), the fifth lens unit (G5), wherein: the first lens unit (G1) is a spherical glass lens with positive refractive power, the second lens unit (G2) is a spherical glass lens with negative refractive power, the first A lens unit (G1) and a second lens unit (G2) are combined into a first cemented lens (L1), and the focal length of the cemented lens is positive; the third lens unit (G3) is a meniscus with positive power Aspheric glass lens; the fourth lens unit (G4) is a spherical glass lens with negative power, the fifth lens unit (G5) is a spherical glass lens with positive power, the fourth lens unit (G4) and the fifth The lens unit (G5) is combined into a second cemented lens (L2), which has a positive focal length value; the second group includes a sixth lens unit (G6), which is a meniscus spherical glass lens with positive optical power .

The lens parameters of the example 1 are as follows:

parameter Lens focal length value f The first group of focal length values f1 The second group of focal length values f2 Optical total length L Field of view FOV f1/f f2/f L/f value 5.87mm 8.25mm 32mm 12mm 58° 1.41 5.45 2.04

The following are the concrete parameters of embodiment 1:

surface number Types of radius thickness optical material half diameter OBJ Object surface infinity 1200 air 736 S1(Stop) standard infinity 0.005 air 1.45 S2 standard 6.12 0.88 H-ZLAF68 1.48 S3 standard -17.55 0.5 H-QK3 1.48 S4 standard 4.21 0.6 air 1.45 S5 Aspherical -4.56 1.29 D-ZLAF81 1.45 S6 Aspherical -2.73 0.22 air 1.8 S7 standard -3.17 0.5 H-ZF72 1.8 S8 standard -69.15 1.4 H-ZLAF68 2.2 S9 standard -4.29 0.1 air 2.5 S10 standard 7.07 2.65 H-ZLAF53 2.9 S11 standard 8.98 0.5 air 2.7 S12 standard infinity 0.9 BK7 2.75 S13 standard infinity 2.45 air 2.85 image standard infinity air 3.4

Aspherical coefficient of the third lens unit (G3) lens:

Third lens unit (G3) Fifth side (S5) Sixth side (S6) k 1.863 -0.058 a ₂ -0.008526 -5.89E-03 a ₃ 0.0009888 1.83E-04 a ₄ -3.76E-05 -5.53E-04 a ₅ 0.0003851 3.09E-04 a ₆ -0.000101 -5.94E-05 a ₇ 0 0 a ₈ 0 0

Figure 2, Figure 3, and Figure 4 are the MTF curve diagram, spot diagram and field curvature distortion diagram of the compact optical lens shown in Figure 1, respectively. Combining Figure 2-Figure 4, it can be seen that the first cemented lens (L1) and the second cemented lens (L2) effectively reduce the imaging chromatic aberration and make the color reproduction of the lens accurate; the third lens unit (G3) is set as an aspheric lens, greatly The volume of the lens is compressed, the image field curvature and astigmatism are effectively corrected, so that the center and edge of the imaging picture can be imaged in high definition; the diaphragm is set at the front of the lens group, which not only improves the brightness of the picture, but also reduces the lens tolerance Sensitivity, effectively improving the production yield.

Example 2

As shown in FIG. 5 , it is a structural schematic diagram of the compact optical lens according to Embodiment 2 of the present invention.

A compact optical lens, which includes a diaphragm surface (S1) arranged sequentially from the object side; a first lens unit (G1) and a second lens unit (G2) combined to form a first cemented lens (L1), including a second The second surface (S2), the third surface (S3), and the fourth surface (S4); the third lens unit (G3) and the fourth lens unit (G4) are combined into a second cemented lens (L2), including the fifth surface ( S5), the sixth surface (S6), the seventh surface (S7); the fifth lens unit (G5), including the eighth surface (S8), the ninth surface (S9); the sixth lens unit (G6), including the The tenth surface (S10), the eleventh surface (S11); the filter (G8), including the twelfth surface (S12), the thirteenth surface (S13); the imaging surface (Image).

The compact optical lens is divided into the first group and the second group, the first group includes the first lens unit (G1), the second lens unit (G2), the third lens unit (G3), the fourth lens unit (G4) and the fifth lens unit, wherein: the first lens unit (G1) is a spherical glass lens with negative refractive power, the second lens unit (G2) is a spherical glass lens with positive refractive power, the first lens unit (G1) and the second lens unit (G2) are combined into the first cemented lens (L1), the focal length of the cemented lens is positive; the third lens unit (G3) is a spherical glass lens with negative power, the first The four-lens unit (G4) is a spherical glass lens with positive power, the third lens unit (G3) and the fourth lens unit (G4) are combined into a second cemented lens (L2), and the focal length of the cemented lens is positive ; The fifth lens unit (G5) is a spherical glass lens with positive refractive power, and the second group includes a sixth lens unit (G6), which is an aspherical glass lens with negative refractive power.

Described embodiment 2 lens parameters are as follows:

parameter Lens focal length value f The first group focal length f1 The second group of focal length values f2 Optical total length L Field of view FOV f1/f f2/f L/f value 5.77mm 10.99mm 16.52mm 12mm 62° 1.9 2.86 2.08

In the above solution, the maximum imaging angle of view FOV range of the optical lens satisfies: 30º<FOV<90º; and the aspheric surface type of the sixth lens unit (G6) satisfies the following equation:

Z=cy^2/{1+[1-(1+k)c^2y^2]^1/2}+a1y^2+a2y^4+a3y^6+a4y^8+a5y^10+a6y ^12+a7y^14+a8y^16

In the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as that of the lens length), and k is the coefficient of the conic conic curve. When k is less than -1, the surface curve is a hyperbola; when k is equal to -1, the surface curve is a parabola; when k is between -1 and 0, the surface curve is an ellipse; when k is equal to 0 , the surface shape is a circle; when k is greater than 0, the surface shape is an oblate curve. a1 to a8 respectively represent the coefficients corresponding to the radial coordinates, through the above parameters, the two imaging optical surfaces of the lens can be precisely set

The shape and size of an aspheric surface.

The following is the concrete parameter setting of embodiment 2:

face number Types of radius thickness optical material half diameter OBJ Object surface infinity 1200 air 736 S1(Stop) standard infinity 0.23 air 1.45 S2 standard -6.15 0.5 H-QF3 1.45 S3 standard 5.61 1.3 H-ZLAF68 1.7 S4 standard -6.54 0.6 air 1.9 S5 standard -3.16 0.5 H-ZF52 2 S6 standard 9.42 1.8 H-ZLAF52 2.45 S7 standard -4.58 0.1 air 2.65 S8 standard 6.59 1.5 H-LAF10LA 3.05 S9 standard -79.41 0.1 air 3.05 S10 standard 53.27 1 D-ZF93 2.85 S11 standard 4.83 0.9 air 2.65 S12 standard infinity 0.9 BK7 2.75 S13 standard infinity 2.45 air 2.75 image standard infinity air 3.4

Aspheric coefficient of the sixth lens unit (G6) lens:

Sixth lens unit (G6) Tenth side (S10) Eleventh side (S11) k 0 0.152 a ₂ 0.000816 2.12E-03 a ₃ -0.0002 -5.44E-04 a ₄ 4.66E-06 -4.51E-05 a ₅ 6.01E-07 5.83E-06 a ₆ -1.8E-08 -3.54E-07 a ₇ 0 0 a ₈ 0 0

Figure 6, Figure 7, and Figure 8 are the MTF curve diagram, spot diagram and field curvature distortion diagram of the compact optical lens shown in Figure 5, respectively. Combining Figures 6-7, it can be seen that the first cemented lens (L1) and the second cemented lens (L2) effectively reduce the imaging chromatic aberration and make the lens color reproduction accurate; the sixth lens (G6) is designed as an aspheric lens, which greatly compresses The volume of the lens is increased, the image field curvature and astigmatism are effectively corrected, so that the center and edge of the imaging picture can be imaged in high definition; the diaphragm is located at the front of the lens, which not only improves the brightness of the picture, but also reduces the sensitivity of the lens tolerance, effectively improving production yield.

And because all the lenses of this optical lens are made of glass, its change is small in high and low temperature environments, which effectively ensures the resolution capability of the lens in the range of ambient temperature (-40°C-95°C), thus meeting the requirements of TS16949 for vehicle-mounted products Require.

The above is the specific implementation of the utility model, and its description is more specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present utility model, and these obvious replacement forms all belong to the protection scope of the present utility model.

Claims (7)

1. A kind of 1. optical lens of compact, it is characterised in that including lens group, diaphragm and IR optical filters, described diaphragm position In the front of described lens group, described IR optical filters are located at the rear of lens group；Described lens group includes six lens Unit, two balsaming lens groups and a glass aspheric lenses are comprised at least in described six lens units.
2. 2. the optical lens of compact according to claim 1, it is characterised in that six described lens units are divided into two Group, described first group includes five lens units, and comprises at least two balsaming lens groups, and described second group includes one Glass aspheric lenses；The focal length of described whole optical lens is f, first group, second group of focal length be respectively f1 and f2；Institute The first group of focal length f1 and the focal length f of optical lens stated meets：1<f1/f<2；Second group of focal length f2 and optical lens focal length f Meet：2<f2/f<8.
3. 3. the optical lens of compact according to claim 2, it is characterised in that described first group includes two groups of gluings Lens and a lens unit；Described lens unit is positioned at the centre of two groups of balsaming lens or the rear end of two groups of balsaming lens.
4. 4. the optical lens of compact according to claim 2, it is characterised in that described second group includes a lens Unit, described lens unit are curved month type glass aspheric lenses, the concave surface court of described curved month type glass aspheric lenses Imaging surface direction, and focal power is negative.
5. 5. the optical lens of compact according to claim 1, it is characterised in that described optical lens overall length is L； The focal length f and lens optical overall length L of described optical lens meet：1.5<L/f<2.5.
6. 6. the optical lens of compact according to claim 1, it is characterised in that the maximum imaging of described optical lens Visual angle FOV scopes meet：30º<FOV<90º.
7. 7. the optical lens of compact according to claim 1, it is characterised in that described glass aspheric lenses face Type meets：

   Z=cy2/{1+[1-(1+k)c2y2]1/2}+a1y2+a2y4+a3y6+a4y8+a5y10+a6y12+a7y14+a8y16

   Described parameter c is the curvature corresponding to radius, and y is radial coordinate；The unit and lens unit of described radial coordinate Long measure it is identical；K is circular cone whose conic coefficient；When k is less than -1, face type curve is hyperbola；When k is equal to -1, Face type curve is parabola；When k is between -1 to 0, face type curve is ellipse；When k is equal to 0, face type is circle；Work as k During more than 0, face type is oblate type curve；Described a1-a8 represents the coefficient corresponding to each radial coordinate respectively.