TWI647505B - Four-piece infrared single wavelength lens system - Google Patents

Abstract

The invention relates to a four-piece infrared single-wavelength projection lens group, which comprises: an aperture from the imaging source side to the image source side; a first lens having a positive refractive power and a glass material, and an imaging source side surface low beam The second lens has a refractive power, and the imaging source side surface has a convex surface at a near optical axis, and the source side surface has a concave surface at a near optical axis; and a third lens has a negative refractive power, and the imaging thereof The source side surface has a concave surface at the near-optical axis, and the source side surface is concave at the near-optical axis; a fourth lens has a positive refractive power, and the imaging source side surface is concave at the near-optical axis, and the source side surface is near The optical axis is convex. A four-piece infrared single-wavelength projection lens set with improved focus length, high resolution, short lens length, and small distortion is achieved.

Description

Four-piece infrared single-wavelength projection lens set

The present invention relates to a lens group, and more particularly to a miniaturized four-piece infrared single-wavelength projection lens set for use in electronic products.

Nowadays, digital imaging technology is constantly innovating and changing. Especially in digital cameras such as digital cameras and mobile phones, miniaturization is being developed. Photosensitive components such as CCD or CMOS are also required to be more miniaturized. In addition to the application of infrared focusing lenses, In the field of photography, in recent years, it has also been widely used in the field of infrared receiving and sensing of game machines, and in order to make the range of the user of the game machine wider, the lens group that receives the infrared wavelength is mostly in the angle of drawing. The wide-angle lens group is the mainstream.

Among them, the applicant has previously proposed a number of lens sets for infrared wavelength reception. However, the current game machine is mainly a 3D game with more stereo, real and realistic feeling. Therefore, the current lens group of the applicant or the applicant is The 2D plane game detection is so demanding that it cannot satisfy the depth sensing effect of the 3D game.

Furthermore, the infrared receiving and sensing lens sets for game machines are made of plastic lenses for the pursuit of low cost. The poor light transmittance of the materials is one of the key factors affecting the depth detection accuracy of the game machine. Secondly, the plastic lenses are easy to be used. The ambient temperature is too hot or too cold, so that the focal length of the lens group changes and the focus cannot be detected accurately. As mentioned above, the lens group that receives the infrared wavelength is unable to meet the two technical problems of accurate sensing of the depth of the 3D game.

In view of this, how to provide an accurate depth-distance detection, reception, and prevention of the focal length change of the lens group affects the depth detection effect, and the lens group that is the infrared wavelength receiving is currently eager to overcome the technical bottleneck.

The object of the present invention is to provide a four-piece infrared single-wavelength projection lens set, in particular to a four-piece infrared single-wavelength projection lens set with improved focus length, high resolution capability, short lens length and small distortion.

In order to achieve the foregoing objective, a four-piece infrared single-wavelength projection lens set according to the present invention includes, in order from the imaging source side to the image source side: an aperture; a first lens having a positive refractive power and a glass material. The imaging source side surface has a convex surface at a near optical axis, and at least one surface of the imaging source side surface and the image source side surface is aspherical; a second lens has a refractive power, and the imaging source side surface has a convex surface at a near optical axis The source side surface has a concave surface at a near optical axis, and at least one surface of the image source side surface and the image source side surface is aspherical; a third lens has a negative refractive power, and the imaging source side surface is at a near optical axis a concave surface having a concave surface at a near-optical axis of the source side surface, at least one surface of the image source side surface and the image source side surface being aspherical; a fourth lens having a positive refractive power, the imaging source side surface at the near optical axis It is a concave surface which is convex at the near-optical axis of the source side surface, and at least one surface of the image source side surface and the image source side surface is aspherical.

Accordingly, the first lens system is placed on the side closest to the object and is most susceptible to damage by external factors, so the first lens cannot be made of a plastic material that is easily damaged but made of a glass material. Therefore, the first lens can be reduced in the generation of cracks, and the first lens can protect other lenses formed of a plastic material. At the same time, the first lens is formed of a glass material, and its refractive index hardly changes with temperature.

Preferably, wherein the four-piece infrared single-wavelength projection lens group has an overall focal length of f, the focal length of the first lens is f1, and the following condition is satisfied: 1.0 < f/f1 < 4.0. The refractive power of the first lens is suitable to avoid excessive sensitivity.

Preferably, wherein the four-piece infrared single-wavelength projection lens group has an overall focal length of f, and the second lens, the third lens and the fourth lens have a combined focal length of f234, and satisfy the following condition: 0.35 < f/f234 < 1.2. Temperature variations can be used to suppress positional variations in image points throughout the four-piece infrared single wavelength projection lens set to a very low level.

Preferably, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -0.81 < f1/f2 < 1.1. Thereby, the refractive power arrangement of the first lens and the second lens is suitable, which can be beneficial to reduce excessive increase of system aberration.

Preferably, wherein the second lens has a focal length of f2, the third lens has a focal length of f3, and satisfies the following condition: -72.3 < f2/f3 < 5.6. Thereby, the peripheral resolution and illumination of the system can be improved.

Preferably, wherein the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following condition is satisfied: -0.67 < f3/f4 < -0.20. This effectively balances the system's flexural force configuration and helps reduce sensitivity to improve manufacturing yield.

Preferably, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following condition is satisfied: -4.9 < f1/f3 < -1.6. Thereby, the positive refractive power of the first lens is effectively distributed, and the sensitivity of the four-piece infrared single-wavelength projection lens group is reduced.

Preferably, wherein the focal length of the second lens is f2, the focal length of the fourth lens is f4, and the following condition is satisfied: -2.5 < f2/f4 < 29.8. Thereby, the distribution of the flexural force of the system is more suitable, which is beneficial to correct the system aberration to improve the imaging quality of the system.

Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following condition is satisfied: -4.1 < f1/f23 < -1.4. When f1/f23 satisfies the above conditions, the resolution of the four-chip infrared single-wavelength projection lens group can be significantly improved.

Preferably, wherein the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens and the fourth lens is f34, and the following condition is satisfied: 0.05 < f12/f34 < 0.79. Thereby, the curvature of field can be effectively corrected.

Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following condition is satisfied: 0.07 < f1/f234 < 0.62. Thereby, the focus length can be effectively increased.

Preferably, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens has a focal length of f4, and satisfies the following condition: 2.8 < f123/f4 < 5.3. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the first lens has an imaging source side surface having a radius of curvature R1, and the image source side surface of the first lens has a radius of curvature of R2 and satisfies the following condition: -0.9 < R1/R2 < 0.9. Thereby, the combined focal length of the four-piece infrared single-wavelength projection lens group is effectively improved.

Preferably, the imaging lens side surface has a radius of curvature R3, the second lens has a source side surface curvature radius of R4, and satisfies the following condition: 0.1 < R3/R4 < 3.6. Thereby, the spherical aberration and astigmatism of the four-chip infrared single-wavelength projection lens group are effectively reduced.

Preferably, the imaging lens side surface has a radius of curvature R5, and the image source side surface of the third lens has a radius of curvature of R6 and satisfies the following condition: -3.9 < R5/R6 < -0.6. Thereby, the spherical aberration and astigmatism of the four-chip infrared single-wavelength projection lens group are effectively reduced.

Preferably, the fourth lens has an imaging source side surface having a radius of curvature R7, and the image source side surface of the fourth lens has a radius of curvature of R8 and satisfies the following condition: 3.5 < R7/R8 < 29.2. Thereby, the spherical aberration and astigmatism of the four-chip infrared single-wavelength projection lens group are effectively reduced.

Preferably, wherein the overall focal length of the four-piece infrared single-wavelength projection lens group is f, the distance from the imaging source side surface to the image source side surface of the first lens on the optical axis is TL, and the following conditions are satisfied: 1.0 < f/TL < 1.67. Thereby, it is advantageous to maintain the miniaturization and long focus of the four-piece infrared single-wavelength projection lens group to be mounted on a thin electronic product.

Preferably, wherein the first lens has a refractive index of n1, the second lens has a refractive index of n2, the third lens has a refractive index of n3, and the fourth lens has a refractive index of n4, and satisfies the following conditions: N1, n2, n3, n4>1.6. Thereby, the transmittance of the whole four-chip infrared single-wavelength projection lens group is facilitated, and the absorption rate of the infrared single wavelength of the mirror group is reduced.

The present invention has been described with reference to the preferred embodiments of the present invention in order to attain

<First Embodiment>

1A and FIG. 1B, FIG. 1A is a schematic diagram of a four-chip infrared single-wavelength projection lens group according to a first embodiment of the present invention, and FIG. 1B is a four-piece type of the first embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As shown in FIG. 1A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 100 and an optical group. The optical group sequentially includes a first lens 110, a second lens 120, and a third from the imaging source side to the image source side. The lens 130, the fourth lens 140, and the image source surface 180, wherein the four-piece infrared single-wavelength projection lens group has four refractive lenses. The aperture 100 is disposed between the imaging source side surface 111 of the first lens 110 and the image source side surface 112.

The first lens 110 has a positive refractive power and is made of glass. The imaging source side surface 111 is convex at the near optical axis 190, and the source side surface 112 is convex at the near optical axis 190, and the imaging source side surface 111 is convex. And the image source side surface 112 are all aspherical.

The second lens 120 has a positive refractive power and is made of a plastic material. The imaging source side surface 121 is convex at the near optical axis 190, and the source side surface 122 is concave at the near optical axis 190, and the imaging source side surface 121 is concave. And the image source side surface 122 are all aspherical.

The third lens 130 has a negative refractive power and is made of a plastic material. The imaging source side surface 131 is concave at the near optical axis 190, and the source side surface 132 is concave at the near optical axis 190, and the imaging source side surface 131 is concave. And the image source side surface 132 are all aspherical.

The fourth lens 140 has a positive refractive power and is made of a plastic material, and the imaging source side surface 141 is concave at the near optical axis 190, and the image side surface 142 is convex at the near optical axis 190, and the imaging source side surface 141 is convex. And the image source side surface 142 are all aspherical.

The aspherical curve equations of the above lenses are expressed as follows:

Where z is the position value with reference to the surface apex at a position of height h in the direction of the optical axis 190; c is the curvature of the lens surface near the optical axis 190, and is the reciprocal of the radius of curvature (R) (c = 1/R) R is the radius of curvature of the lens surface near the optical axis 190, h is the vertical distance of the lens surface from the optical axis 190, k is a conic constant, and A, B, C, D, E, F, G, ... ...is a high-order aspheric coefficient.

In the four-piece infrared single-wavelength projection lens group of the first embodiment, the focal length of the four-chip infrared single-wavelength projection lens group is f, and the aperture value (f-number) of the four-chip infrared single-wavelength projection lens group is Fno. The maximum field of view (angle of view) in the four-piece infrared single-wavelength projection lens set is FOV, and its values are as follows: f = 4.80 (millimeter); Fno = 2.8; and FOV = 12.0 (degrees).

In the four-piece infrared single-wavelength projection lens group of the first embodiment, the overall focal length of the four-chip infrared single-wavelength projection lens group is f, the focal length of the first lens 110 is f1, and the following condition is satisfied: f/f1 =2.52.

In the four-piece infrared single-wavelength projection lens group of the first embodiment, the overall focal length of the four-chip infrared single-wavelength projection lens group is f, and the composite focal length of the second lens 120, the third lens 130, and the fourth lens 140 Is f234, and the following conditions are met: f/f234=0.57.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, and the following condition is satisfied: f1/f2=0.04.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, and the following condition is satisfied: f2/f3=-71.82.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f3/f4=-0.40.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the third lens 130 is f3, and the following condition is satisfied: f1/f3=-2.74.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f2/f4=28.75.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the first lens 110 is f1, the combined focal length of the second lens 120 and the third lens 130 is f23, and the following conditions are satisfied: f1/f23 =-2.58.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the composite focal length of the first lens 110 and the second lens 120 is f12, and the combined focal length of the third lens 130 and the fourth lens 140 is f34, and is satisfied. The following conditions: f12/f34=0.21.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the focal length of the first lens 110 is f1, and the combined focal length of the second lens 120, the third lens 130, and the fourth lens 140 is f234, and the following Condition: f1/f234=0.23.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the first lens 110, the second lens 120 and the third lens 130 have a combined focal length of f123, and the fourth lens 140 has a focal length of f4 and satisfies The following conditions are: f123/f4 = 3.34.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the imaging source side surface 111 of the first lens 110 has a radius of curvature R1, and the image source side surface 112 of the first lens 110 has a radius of curvature of R2 and satisfies The following conditions are: R1/R2 = -0.01.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the imaging source side surface 121 of the second lens 120 has a radius of curvature R3, and the image source side surface 122 of the second lens 120 has a radius of curvature of R4 and satisfies The following conditions are true: R3/R4 = 0.89.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the imaging source side surface 131 of the third lens 130 has a radius of curvature R5, and the image source side surface 132 of the third lens 130 has a radius of curvature of R6 and satisfies The following conditions are: R5/R6 = -3.57.

In the four-piece infrared single-wavelength projection lens set of the first embodiment, the imaging source side surface 141 of the fourth lens 140 has a radius of curvature R7, and the image source side surface 142 of the fourth lens 140 has a radius of curvature of R8 and satisfies The following conditions are: R7/R8 = 5.65.

In the four-piece infrared single-wavelength projection lens group of the first embodiment, the overall focal length of the four-chip infrared single-wavelength projection lens group is f, and the imaging source side surface 111 to the image source side surface 112 of the first lens 110 are The distance on the optical axis 190 is TL and the following conditions are met: f/TL = 1.37.

The four-chip infrared single-wavelength projection lens set according to claim 1, wherein the first lens 110 has a refractive index n1, the second lens 120 has a refractive index n2, and the third lens 130 has a refractive index n3. The fourth lens 140 has a refractive index of n4 and satisfies the following conditions: n1 = 1.694, n2 = 1.636, n3 = 1.636, and n4 = 1.636.

Refer to Table 1 and Table 2 below for reference.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 1</b></td></tr><tr>< Td> first embodiment </td></tr><tr><td><u>F(</u><u>focal length)=4.80 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.0 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.226 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.226 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 1.314 </td><td> (ASP) </td><td> 0.598 </td><td> Glass</td><td> 1.694 </td><td> 53.2 </td><td> 1.91 </td></tr><tr><td> 4 </td><td> </td ><td> -97.791 </td><td> (ASP) </td><td> 0.036 </td><td> </td><td> </t d><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 4.263 </td>< Td> (ASP) </td><td> 0.327 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td><td> 49.98 </td>< /tr><tr><td> 6 </td><td> </td><td> 4.808 </td><td> (ASP) </td><td> 0.608 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td> <td> -2.030 </td><td> (ASP) </td><td> 0.250 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td ><td> -0.70 </td></tr><tr><td> 8 </td><td> </td><td> 0.568 </td><td> (ASP) </td> <td> 0.779 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td ><td> Fourth lens</td><td> -5.179 </td><td> (ASP) </td><td> 0.513 </td><td> Plastic </td><td> 1.636 </td><td> 24.0 </td><td> 1.74 </td></tr><tr><td> 10 </td><td> </td><td> -0.917 </td ><td> (ASP) </td><td> 0.398 </td><td> </td><td> </td><td> </td><td> </td></tr ><tr><td> 11 </td><td> Image source surface </td><td> Plane</td><td> </td><td> </td><td> </td ><td> </td><td> </ Td></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 2</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -8.4403E-01 </td><td> -3.2622E+02 </td><td> 1.6912 E+01 </td><td> -7.3427E+01 </td></tr><tr><td> A: </td><td> -1.0677E-02 </td><td> 2.6010E-02 </td><td> 4.7586E-02 </td><td> -4.7110E-02 </td></tr><tr><td> B: </td><td> -1.8032E-02 </td><td> -1.4891E-02 </td><td> 9.4453E-02 </td><td> -9.2715E-02 </td></tr><tr ><td> C: </td><td> -7.6615E-02 </td><td> 1.9209E-02 </td><td> 6.0812E-02 </td><td> 5.9737E- 02 </td></tr><tr><td> D: </td><td> 1.3092E-02 </td><td> -1.5576E-02 </td><td> 1.1717E- 02 </td><td> 3.4487E-02 </td></tr><tr><td> E: </td><td> </td><td> </td><td> 2.2304 E-03 </td><td> -4.0669E-02 </td></tr><tr><td> F: </td><td> </td><td> </td>< Td> -1.3020E-01 </td><td> -6.1812E-02 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 </td><td> 9 </td><td> 10 </td></tr><tr><td> K: </td><td> 1.9126E+01 </td><td> -3.0145E+00 </td><td> 5.5651E+01 </td><td> -8.6108E-01 </ Td></tr><tr><td> A: </td><td> -6.7094E-01 </td><td> 1.5973E+00 </td><td> 7.9115E-02 </ Td><td> -3.2845E-01 </td></tr><tr><td> B: </td><td> 2.2042E+00 </td><td> 8.3575E+00 </ Td><td> -1.0659E+00 </td><td> 5.6358E-01 </td></tr><tr><td> C: </td><td> 1.1020E+00 </ Td><td> -8.4614E+01 </td><td> 4.2545E+00 </td><td> -2.1332E+00 </td></tr><tr><td> D: < /td><td> -4.6783E+01 </td><td> 2.2472E+02 </td><td> -4.5758E+00 </td><td> 2.8358E+00 </td>< /tr><tr><td> E: </td><td> 3.5677E+02 </td><td> 4.5970E+03 </td><td> 2.2936E+00 </td><td > 7.7635E-01 </td></tr><tr><td> F: </td><td> -1.4430E+02 </td><td> -2.7594E+04 </td>< Td> 1.6728E+00 </td><td> -1.7925E+00 </td></tr></TBODY></TABLE>

Table 1 is the detailed structural data of the first embodiment of Fig. 1A, in which the unit of curvature radius, thickness and focal length is mm, and the surfaces 0-11 sequentially represent the surface from the imaging source side to the image source side. Table 2 is the aspherical surface data in the first embodiment, wherein the cone surface coefficients in the a-spherical curve equation of k, A, B, C, D, E, F, G, H, ... are high-order aspherical coefficients. In addition, the table of the following embodiments corresponds to the schematic diagram and the aberration diagram of each embodiment, and the definition of the data in the table is the same as the definitions of Table 1 and Table 2 of the first embodiment, and details are not described herein.

<Second embodiment>

2A and FIG. 2B, FIG. 2A is a schematic diagram of a four-chip infrared single-wavelength projection lens set according to a second embodiment of the present invention, and FIG. 2B is a four-piece form of the second embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As can be seen from FIG. 2A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 200 and an optical group. The optical group sequentially includes a first lens 210, a second lens 220, and a third from the imaging source side to the image source side. The lens 230, the fourth lens 240, and the image source surface 280, wherein the four-piece infrared single-wavelength projection lens group has four refractive lenses. The aperture 200 is disposed between the imaging source side surface 211 and the image source side surface 212 of the first lens 210.

The first lens 210 has a positive refractive power and is made of a glass material. The imaging source side surface 211 is convex at the near optical axis 290, and the source side surface 212 is convex at the near optical axis 290, and the imaging source side surface 211 is formed. And the image source side surface 212 are all aspherical.

The second lens 220 has a negative refractive power and is made of a plastic material. The imaging source side surface 221 is convex at the near optical axis 290, and the source side surface 222 is concave at the near optical axis 290, and the imaging source side surface 221 And the image source side surface 222 are all aspherical.

The third lens 230 has a negative refractive power and is made of a plastic material, and the imaging source side surface 231 is concave at the near optical axis 290, and the source side surface 232 is concave at the near optical axis 290, and the imaging source side surface 231 And the image source side surface 232 are all aspherical.

The fourth lens 240 has a positive refractive power and is made of a plastic material. The imaging source side surface 241 is concave at the near optical axis 290, and the source side surface 242 is convex at the near optical axis 290, and the imaging source side surface 241 is formed. And the image source side surface 242 are all aspherical.

Refer to Table 3 and Table 4 below.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 3</b></td></tr><tr>< Td> Second embodiment </td></tr><tr><td><u>F(</u><u>focal length) =4.49 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.8 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.386 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.386 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 0.967 </td><td> (ASP) </td><td> 0.628 </td><td> Glass</td><td> 1.694 </td><td> 53.2 </td><td> 1.34 </td></tr><tr><td> 4 </td><td> </td ><td> -11.955 </td><td> (ASP) </td><td> 0.050 </td><td> </td><td> </t d><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 2.521 </td>< Td> (ASP) </td><td> 0.307 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td><td> -2.21 </td> </tr><tr><td> 6 </td><td> </td><td> 0.840 </td><td> (ASP) </td><td> 0.433 </td><td > </td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td ><td> -0.958 </td><td> (ASP) </td><td> 0.209 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </ Td><td> -0.68 </td></tr><tr><td> 8 </td><td> </td><td> 0.798 </td><td> (ASP) </td ><td> 0.613 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </ Td><td> fourth lens</td><td> -24.441 </td><td> (ASP) </td><td> 0.561 </td><td> plastic</td><td> 1.636 </td><td> 24.0 </td><td> 1.45 </td></tr><tr><td> 10 </td><td> </td><td> -0.867 </ Td><td> (ASP) </td><td> 0.509 </td><td> </td><td> </td><td> </td><td> </td></ Tr><tr><td> 11 </td><td> image source surface </td><td> plane </td><td> </td><td> </td><td> </ Td><td> </td><td> < /td></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 4</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -4.7373E-01 </td><td> -5.0000E+02 </td><td> 1.1269 E+01 </td><td> -5.4720E+00 </td></tr><tr><td> A: </td><td> 5.8676E-03 </td><td> 4.8166 E-01 </td><td> 4.5659E-01 </td><td> 6.1166E-01 </td></tr><tr><td> B: </td><td> 1.5655E -01 </td><td> 1.3966E+00 </td><td> 2.8239E+00 </td><td> 2.3037E+00 </td></tr><tr><td> C : </td><td> 5.8754E-02 </td><td> 1.9361E-01 </td><td> 1.2858E-01 </td><td> -4.2978E+00 </td> </tr><tr><td> D: </td><td> 9.8624E-02 </td><td> -3.5861E+00 </td><td> -6.7087E+00 </td ><td> 3.7456E+01 </td></tr><tr><td> E: </td><td> </td><td> </td><td> -3.8747E+00 </td><td> 2.2735E+02 </td></tr><tr><td> F: </td><td> </td><td> </td><td> 4.6024E +01 </td><td> -6.9418E+02 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 </td>< Td> 9 </td><td> 10 </td></tr><tr><td> K: < /td><td> 3.5847E+00 </td><td> -2.3102E+00 </td><td> 1.3624E+02 </td><td> -7.7606E-01 </td>< /tr><tr><td> A: </td><td> -2.0790E+00 </td><td> -1.1886E-01 </td><td> 1.7513E-02 </td> <td> -3.3955E-01 </td></tr><tr><td> B: </td><td> 1.2453E+01 </td><td> 1.0168E+01 </td> <td> -7.6911E-01 </td><td> 1.3941E+00 </td></tr><tr><td> C: </td><td> -7.0046E+01 </td ><td> 3.7721E+01 </td><td> 4.3536E+00 </td><td> -6.4229E+00 </td></tr><tr><td> D: </td ><td> 8.4522E+02 </td><td> -7.6680E+01 </td><td> -6.9622E+00 </td><td> 1.5429E+01 </td></tr ><tr><td> E: </td><td> -6.9062E+03 </td><td> -5.3374E+03 </td><td> 8.1794E+00 </td><td > -1.7176E+01 </td></tr><tr><td> F: </td><td> 1.3841E+04 </td><td> 1.9116E+04 </td><td > -7.2187E+00 </td><td> 8.9290E+00 </td></tr></TBODY></TABLE>

In the second embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 3 and Table 4, the following data can be derived:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Second embodiment</td></tr><tr><td> f[mm ] </td><td> 4.49 </td><td> f1/f23 </td><td> -2.94 </td></tr><tr><td> Fno </td><td> 2.8 </td><td> f12/f34 </td><td> 0.48 </td></tr><tr><td> FOV[deg.] </td><td> 12.8 </td> <td> f1/f234 </td><td> 0.23 </td></tr><tr><td> f/f1 </td><td> 3.35 </td><td> f123/f4 < /td><td> 4.55 </td></tr><tr><td> f/f234 </td><td> 0.76 </td><td> R1/R2 </td><td> - 0.08 </td></tr><tr><td> f1/f2 </td><td> -0.61 </td><td> R3/R4 </td><td> 3.00 </td>< /tr><tr><td> f2/f3 </td><td> 3.25 </td><td> R5/R6 </td><td> -1.20 </td></tr><tr> <td> f3/f4 </td><td> -0.47 </td><td> R7/R8 </td><td> 28.19 </td></tr><tr><td> f1/f3 </td><td> -1.97 </td><td> f/TL </td><td> 1.36 </td></tr><tr><td> f2/f4 </td><td > -1.52 </td><td> </td><td> </td></tr></TBODY></TABLE>

<Third embodiment>

Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of a four-chip infrared single-wavelength projection lens set according to a third embodiment of the present invention, and FIG. 3B is a four-piece embodiment of the third embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As can be seen from FIG. 3A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 300 and an optical group. The optical group sequentially includes a first lens 310, a second lens 320, and a third from the imaging source side to the image source side. The lens 330, the fourth lens 340, and the image source surface 380, wherein the four-chip infrared single-wavelength projection lens group has four refractive lenses. The aperture 300 is disposed between the imaging source side surface 311 and the image source side surface 312 of the first lens 310.

The first lens 310 has a positive refractive power and is made of a glass material. The imaging source side surface 311 is convex at the near optical axis 390, and the image side surface 312 is convex at the near optical axis 390, and the imaging source side surface 311 is formed. And the image source side surface 312 are all aspherical.

The second lens 320 has a negative refractive power and is made of a plastic material. The imaging source side surface 321 is convex at the near optical axis 390, and the image side surface 322 is concave at the near optical axis 390, and the imaging source side surface 321 And the image source side surface 322 are all aspherical.

The third lens 330 has a negative refractive power and is made of a plastic material. The imaging source side surface 331 is concave at the near optical axis 390, and the image side surface 332 is concave at the near optical axis 390, and the imaging source side surface 331 The image source side surface 332 is aspherical.

The fourth lens 340 has a positive refractive power and is made of a plastic material, and the imaging source side surface 341 is concave at the near optical axis 390, and the source side surface 342 is convex at the near optical axis 390, and the imaging source side surface 341 And the image source side surface 342 are all aspherical.

Refer to Table 5 and Table 6 below for reference.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 5</b></td></tr><tr>< Td> Third embodiment </td></tr><tr><td><u>F(</u><u>focal length) = 4.50 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.8 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.195 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.195 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 1.240 </td><td> (ASP) </td><td> 0.600 </td><td> Glass</td><td> 1.694 </td><td> 53.2 </td><td> 1.21 </td></tr><tr><td> 4 </td><td> </td ><td> -1.989 </td><td> (ASP) </td><td> 0.044 </td><td> </td><td> </td ><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 2.749 </td><td > (ASP) </td><td> 0.312 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td><td> -2.12 </td>< /tr><tr><td> 6 </td><td> </td><td> 0.842 </td><td> (ASP) </td><td> 0.473 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td> <td> -1.101 </td><td> (ASP) </td><td> 0.223 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td ><td> -0.60 </td></tr><tr><td> 8 </td><td> </td><td> 0.586 </td><td> (ASP) </td> <td> 0.583 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td ><td> Fourth lens</td><td> -8.292 </td><td> (ASP) </td><td> 0.573 </td><td> Plastic </td><td> 1.636 </td><td> 24.0 </td><td> 1.42 </td></tr><tr><td> 10 </td><td> </td><td> -0.804 </td ><td> (ASP) </td><td> 0.501 </td><td> </td><td> </td><td> </td><td> </td></tr ><tr><td> 11 </td><td> Image source surface </td><td> Plane</td><td> </td><td> </td><td> </td ><td> </td><td> </t d></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 6</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -7.9251E-01 </td><td> -4.1582E+01 </td><td> 1.2193 E+01 </td><td> -8.4044E+00 </td></tr><tr><td> A: </td><td> -2.5483E-02 </td><td> 2.0448E-01 </td><td> 4.0801E-01 </td><td> 2.1216E-02 </td></tr><tr><td> B: </td><td> 3.5504 E-03 </td><td> 5.9631E-03 </td><td> -2.8000E-01 </td><td> -1.3395E+00 </td></tr><tr>< Td> C: </td><td> 4.2414E-02 </td><td> -1.5132E-01 </td><td> 2.1253E+00 </td><td> 7.7099E+00 < /td></tr><tr><td> D: </td><td> -1.1998E-01 </td><td> -4.8274E-03 </td><td> -3.8096E+ 00 </td><td> -1.1940E+01 </td></tr><tr><td> E: </td><td> </td><td> </td><td> 3.9485E+00 </td><td> 1.1662E+00 </td></tr><tr><td> F: </td><td> </td><td> </td>< Td> 0.0000E+00 </td><td> 0.0000E+00 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 </ Td><td> 9 </td><td> 10 </td></tr><tr><td> K : </td><td> 8.2126E-01 </td><td> -1.1612E+01 </td><td> 1.4562E+02 </td><td> -7.8841E-01 </td ></tr><tr><td> A: </td><td> -2.8399E+00 </td><td> 6.0132E+00 </td><td> 2.8051E-01 </td ><td> -2.8899E-01 </td></tr><tr><td> B: </td><td> 1.0214E+01 </td><td> -4.7873E+01 </ Td><td> -8.9883E-01 </td><td> 1.6858E+00 </td></tr><tr><td> C: </td><td> 1.3405E+01 </ Td><td> 6.0287E+02 </td><td> 6.3373E+00 </td><td> -8.0383E+00 </td></tr><tr><td> D: </ Td><td> -3.7861E+02 </td><td> -4.0165E+03 </td><td> -1.2180E+01 </td><td> 1.8810E+01 </td>< /tr><tr><td> E: </td><td> 8.7233E+02 </td><td> 8.5908E+03 </td><td> 6.7973E+00 </td><td > -1.5526E+01 </td></tr><tr><td> F: </td><td> 0.0000E+00 </td><td> 0.0000E+00 </td><td > 0.0000E+00 </td><td> 0.0000E+00 </td></tr></TBODY></TABLE>

In the third embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 5 and Table 6, the following data can be derived:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Third Embodiment</td></tr><tr><td> f[mm ] </td><td> 4.50 </td><td> f1/f23 </td><td> -3.06 </td></tr><tr><td> Fno </td><td> 2.8 </td><td> f12/f34 </td><td> 0.39 </td></tr><tr><td> FOV[deg.] </td><td> 12.8 </td> <td> f1/f234 </td><td> 0.17 </td></tr><tr><td> f/f1 </td><td> 3.71 </td><td> f123/f4 < /td><td> 4.63 </td></tr><tr><td> f/f234 </td><td> 0.64 </td><td> R1/R2 </td><td> - 0.62 </td></tr><tr><td> f1/f2 </td><td> -0.57 </td><td> R3/R4 </td><td> 3.27 </td>< /tr><tr><td> f2/f3 </td><td> 3.55 </td><td> R5/R6 </td><td> -1.88 </td></tr><tr> <td> f3/f4 </td><td> -0.42 </td><td> R7/R8 </td><td> 10.32 </td></tr><tr><td> f1/f3 </td><td> -2.04 </td><td> f/TL </td><td> 1.36 </td></tr><tr><td> f2/f4 </td><td > -1.50 </td><td> </td><td> </td></tr></TBODY></TABLE>

<Fourth embodiment>

Please refer to FIG. 4A and FIG. 4B , wherein FIG. 4A is a schematic diagram of a four-chip infrared single-wavelength projection lens set according to a fourth embodiment of the present invention, and FIG. 4B is a four-piece fourth embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As can be seen from FIG. 4A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 400 and an optical group. The optical group sequentially includes a first lens 410, a second lens 420, and a third from the imaging source side to the image source side. The lens 430, the fourth lens 440, and the image source surface 480, wherein the four-chip infrared single-wavelength projection lens group has four refractive lenses. The aperture 400 is disposed between the imaging source side surface 411 and the image source side surface 412 of the first lens 410.

The first lens 410 has a positive refractive power and is made of a glass material, and the imaging source side surface 411 is convex at the near optical axis 490, and the source side surface 412 is convex at the near optical axis 490, and the imaging source side surface 411 And the image source side surface 412 are all aspherical.

The second lens 420 has a negative refractive power and is made of a plastic material. The imaging source side surface 421 is convex at the near optical axis 490, and the source side surface 422 is concave at the near optical axis 490, and the imaging source side surface 421 And the image source side surface 422 are all aspherical.

The third lens 430 has a negative refractive power and is made of a plastic material, and the imaging source side surface 431 is concave at the near optical axis 490, and the source side surface 432 is concave at the near optical axis 490, and the imaging source side surface 431 is concave. And the image source side surface 432 are all aspherical.

The fourth lens 440 has a positive refractive power and is made of a plastic material. The imaging source side surface 441 is concave at the near optical axis 490, and the image side surface 442 is convex at the near optical axis 490, and the imaging source side surface 441 is formed. And the image source side surface 442 are all aspherical.

Refer to Table 7 and Table 8 below for reference.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 7</b></td></tr><tr>< Td> Fourth embodiment </td></tr><tr><td><u>F(</u><u>focal length) =4.50 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.8 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.188 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.188 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 1.250 </td><td> (ASP) </td><td> 0.598 </td><td> Glass</td><td> 1.694 </td><td> 53.2 </td><td> 1.24 </td></tr><tr><td> 4 </td><td> </td ><td> -2.107 </td><td> (ASP) </td><td> 0.031 </td><td> </td><td> </td ><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 2.738 </td><td > (ASP) </td><td> 0.330 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td><td> -2.28 </td>< /tr><tr><td> 6 </td><td> </td><td> 0.881 </td><td> (ASP) </td><td> 0.487 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td> <td> -1.123 </td><td> (ASP) </td><td> 0.231 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td ><td> -0.59 </td></tr><tr><td> 8 </td><td> </td><td> 0.575 </td><td> (ASP) </td> <td> 0.520 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td ><td> Fourth lens</td><td> -5.860 </td><td> (ASP) </td><td> 0.640 </td><td> Plastic </td><td> 1.636 </td><td> 24.0 </td><td> 1.39 </td></tr><tr><td> 10 </td><td> </td><td> -0.774 </td ><td> (ASP) </td><td> 0.499 </td><td> </td><td> </td><td> </td><td> </td></tr ><tr><td> 11 </td><td> Image source surface </td><td> Plane</td><td> </td><td> </td><td> </td ><td> </td><td> </t d></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 8</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -8.8505E-01 </td><td> -4.2960E+01 </td><td> 1.1819 E+01 </td><td> -8.3987E+00 </td></tr><tr><td> A: </td><td> -3.1652E-02 </td><td> 1.9349E-01 </td><td> 3.9062E-01 </td><td> 9.4515E-02 </td></tr><tr><td> B: </td><td> 2.8551 E-03 </td><td> -4.6447E-02 </td><td> -3.3693E-01 </td><td> -1.0861E+00 </td></tr><tr> <td> C: </td><td> 4.3129E-02 </td><td> -2.3073E-01 </td><td> 2.1257E+00 </td><td> 8.0517E+00 </td></tr><tr><td> D: </td><td> -1.8161E-01 </td><td> 3.1149E-02 </td><td> -3.8528E+ 00 </td><td> -1.1576E+01 </td></tr><tr><td> E: </td><td> </td><td> </td><td> 3.7060E+00 </td><td> 2.3601E+00 </td></tr><tr><td> F: </td><td> </td><td> </td>< Td> 0.0000E+00 </td><td> 0.0000E+00 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 </ Td><td> 9 </td><td> 10 </td></tr><tr><td> K : </td><td> -3.5142E+00 </td><td> -1.4382E+01 </td><td> 4.8232E+01 </td><td> -6.0709E-01 </ Td></tr><tr><td> A: </td><td> -2.7674E+00 </td><td> 6.7752E+00 </td><td> 1.6746E-01 </ Td><td> -2.1341E-01 </td></tr><tr><td> B: </td><td> 1.1256E+01 </td><td> -5.4368E+01 < /td><td> -1.2985E+00 </td><td> 1.5185E+00 </td></tr><tr><td> C: </td><td> 2.6507E+01 < /td><td> 6.7506E+02 </td><td> 6.6627E+00 </td><td> -8.3326E+00 </td></tr><tr><td> D: < /td><td> -5.3141E+02 </td><td> -4.3912E+03 </td><td> -1.2881E+01 </td><td> 1.7484E+01 </td> </tr><tr><td> E: </td><td> 1.3214E+03 </td><td> 1.1235E+04 </td><td> 6.2733E+00 </td>< Td> -1.4008E+01 </td></tr><tr><td> F: </td><td> 5.1795E+02 </td><td> -9.1903E+03 </td> <td> 0.0000E+00 </td><td> 0.0000E+00 </td></tr></TBODY></TABLE>

In the fourth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 7 and Table 8:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Fourth Embodiment</td></tr><tr><td> f[mm ] </td><td> 4.50 </td><td> f1/f23 </td><td> -3.08 </td></tr><tr><td> Fno </td><td> 2.8 </td><td> f12/f34 </td><td> 0.426 </td></tr><tr><td> FOV[deg.] </td><td> 12.8 </td> <td> f1/f234 </td><td> 0.216 </td></tr><tr><td> f/f1 </td><td> 3.62 </td><td> f123/f4 < /td><td> 4.60 </td></tr><tr><td> f/f234 </td><td> 0.78 </td><td> R1/R2 </td><td> - 0.59 </td></tr><tr><td> f1/f2 </td><td> -0.55 </td><td> R3/R4 </td><td> 3.11 </td>< /tr><tr><td> f2/f3 </td><td> 3.85 </td><td> R5/R6 </td><td> -1.95 </td></tr><tr> <td> f3/f4 </td><td> -0.43 </td><td> R7/R8 </td><td> 7.57 </td></tr><tr><td> f1/f3 </td><td> -2.10 </td><td> f/TL </td><td> 1.35 </td></tr><tr><td> f2/f4 </td><td > -1.64 </td><td> </td><td> </td></tr></TBODY></TABLE>

<Fifth Embodiment>

5A and 5B, wherein FIG. 5A is a schematic diagram of a four-chip infrared single-wavelength projection lens set according to a fifth embodiment of the present invention, and FIG. 5B is a four-piece form of the fifth embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As can be seen from FIG. 5A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 500 and an optical group. The optical group sequentially includes a first lens 510, a second lens 520, and a third from the imaging source side to the image source side. The lens 530, the fourth lens 540, and the image source surface 580, wherein the four-chip infrared single-wavelength projection lens group has four refractive lenses. The aperture 500 is disposed between the imaging source side surface 511 and the image source side surface 512 of the first lens 510.

The first lens 510 has a positive refractive power and is made of a glass material. The imaging source side surface 511 is convex at the near optical axis 590, and the source side surface 512 is convex at the near optical axis 590, and the imaging source side surface 511 is convex. And the image source side surface 512 are all aspherical.

The second lens 520 has a negative refractive power and is made of a plastic material. The imaging source side surface 521 is convex at the near optical axis 590, and the source side surface 522 is concave at the near optical axis 590, and the imaging source side surface 521 is formed. And the image source side surface 522 are all aspherical.

The third lens 530 has a negative refractive power and is made of a plastic material, and the imaging source side surface 531 is concave at the near optical axis 590, and the source side surface 532 is concave at the near optical axis 590, and the imaging source side surface 531 is concave. And the image source side surface 532 are all aspherical.

The fourth lens 540 has a positive refractive power and is made of a plastic material, and the imaging source side surface 541 is concave at the near optical axis 590, and the source side surface 542 is convex at the near optical axis 590, and the imaging source side surface 541 is convex. And the image source side surface 542 are all aspherical.

Refer to Table 9 and Table 10 below.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 9</b></td></tr><tr>< Td> Fifth embodiment </td></tr><tr><td><u>F(</u><u>focal length) =4.50 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.8 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.190 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.190 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 1.124 </td><td> (ASP) </td><td> 0.612 </td><td> Glass</td><td> 1.694 </td><td> 53.2 </td><td> 1.46 </td></tr><tr><td> 4 </td><td> </td ><td> -6.653 </td><td> (ASP) </td><td> 0.030 </td><td> </td><td> </td ><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 1.829 </td><td > (ASP) </td><td> 0.340 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td><td> -3.15 </td>< /tr><tr><td> 6 </td><td> </td><td> 0.872 </td><td> (ASP) </td><td> 0.519 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td> <td> -0.766 </td><td> (ASP) </td><td> 0.242 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td ><td> -0.62 </td></tr><tr><td> 8 </td><td> </td><td> 0.849 </td><td> (ASP) </td> <td> 0.507 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td ><td> Fourth lens</td><td> -9.601 </td><td> (ASP) </td><td> 0.589 </td><td> Plastic </td><td> 1.636 </td><td> 24.0 </td><td> 1.39 </td></tr><tr><td> 10 </td><td> </td><td> -0.799 </td ><td> (ASP) </td><td> 0.500 </td><td> </td><td> </td><td> </td><td> </td></tr ><tr><td> 11 </td><td> Image source surface </td><td> Plane</td><td> </td><td> </td><td> </td ><td> </td><td> </t d></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 10</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -7.3231E-01 </td><td> -3.1367E+02 </td><td> 4.8351 E+00 </td><td> -1.7929E+00 </td></tr><tr><td> A: </td><td> -2.8178E-02 </td><td> 4.0302E-01 </td><td> 7.0662E-01 </td><td> 3.8759E-01 </td></tr><tr><td> B: </td><td> 8.6830 E-02 </td><td> -3.4625E-02 </td><td> -9.1470E-02 </td><td> 8.7775E-01 </td></tr><tr>< Td> C: </td><td> 1.2417E-02 </td><td> -1.0493E+00 </td><td> 9.5686E-01 </td><td> 3.4398E+00 < /td></tr><tr><td> D: </td><td> -1.1679E-01 </td><td> 8.4764E-01 </td><td> -4.9062E+00 </td><td> -5.5696E+00 </td></tr><tr><td> E: </td><td> </td><td> </td><td> 8.4796 E+00 </td><td> 2.7203E+01 </td></tr><tr><td> F: </td><td> </td><td> </td><td > -3.5847E+00 </td><td> -2.4278E+02 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 < /td><td> 9 </td><td> 10 </td></tr><tr><td> K: </td><td> -1.3315E+01 </td><td> -2.4165E+01 </td><td> 2.0744E+02 </td><td> 1.4062E-01 </ Td></tr><tr><td> A: </td><td> -2.7020E+00 </td><td> 7.1283E+00 </td><td> 4.3902E-01 </ Td><td> 7.9338E-02 </td></tr><tr><td> B: </td><td> 9.8176E+00 </td><td> -5.8923E+01 </ Td><td> -1.2085E+00 </td><td> 7.8301E-01 </td></tr><tr><td> C: </td><td> -1.9463E+01 < /td><td> 6.0752E+02 </td><td> 6.9948E+00 </td><td> -3.6234E+00 </td></tr><tr><td> D: < /td><td> -1.2174E+03 </td><td> -4.4472E+03 </td><td> -1.5207E+01 </td><td> 1.6465E+01 </td> </tr><tr><td> E: </td><td> 1.2145E+04 </td><td> 1.5956E+04 </td><td> 1.1010E+01 </td>< Td> -3.1451E+01 </td></tr><tr><td> F: </td><td> -4.2901E+04 </td><td> -2.3773E+04 </td ><td> 3.3157E+00 </td><td> 2.8647E+01 </td></tr></TBODY></TABLE>

In the fifth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 9 and Table 10:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Fifth Embodiment</td></tr><tr><td> f[mm ] </td><td> 4.50 </td><td> f1/f23 </td><td> -3.08 </td></tr><tr><td> Fno </td><td> 2.8 </td><td> f12/f34 </td><td> 0.43 </td></tr><tr><td> FOV[deg.] </td><td> 12.8 </td> <td> f1/f234 </td><td> 0.25 </td></tr><tr><td> f/f1 </td><td> 3.08 </td><td> f123/f4 < /td><td> 4.77 </td></tr><tr><td> f/f234 </td><td> 0.75 </td><td> R1/R2 </td><td> - 0.17 </td></tr><tr><td> f1/f2 </td><td> -0.46 </td><td> R3/R4 </td><td> 2.10 </td>< /tr><tr><td> f2/f3 </td><td> 5.06 </td><td> R5/R6 </td><td> -0.90 </td></tr><tr> <td> f3/f4 </td><td> -0.45 </td><td> R7/R8 </td><td> 12.01 </td></tr><tr><td> f1/f3 </td><td> -2.35 </td><td> f/TL </td><td> 1.35 </td></tr><tr><td> f2/f4 </td><td > -2.27 </td><td> </td><td> </td></tr></TBODY></TABLE>

<Sixth embodiment>

6A and 6B, wherein FIG. 6A is a schematic diagram of a four-chip infrared single-wavelength projection lens set according to a sixth embodiment of the present invention, and FIG. 6B is a four-piece form of the sixth embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As can be seen from FIG. 6A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 600 and an optical group. The optical group sequentially includes a first lens 610, a second lens 620, and a third from the imaging source side to the image source side. The lens 630, the fourth lens 640, and the image source surface 680, wherein the four-chip infrared single-wavelength projection lens group has four refractive lenses. The aperture 600 is disposed between the imaging source side surface 611 and the image source side surface 612 of the first lens 610.

The first lens 610 has a positive refractive power and is made of glass. The imaging source side surface 611 is convex at the near optical axis 690, and the source side surface 612 is concave at the near optical axis 690, and the imaging source side surface 611 is formed. And the image source side surface 612 are all aspherical.

The second lens 620 has a positive refractive power and is made of a plastic material. The imaging source side surface 621 is convex at the near optical axis 690, and the source side surface 622 is concave at the near optical axis 690, and the imaging source side surface 621 is formed. And the image source side surface 622 are all aspherical.

The third lens 630 has a negative refractive power and is made of a plastic material. The imaging source side surface 631 is concave at the near optical axis 690, and the image side surface 632 is concave at the near optical axis 690, and the imaging source side surface 631 is concave. And the image source side surface 632 are all aspherical.

The fourth lens 640 has a positive refractive power and is made of a plastic material. The imaging source side surface 641 is concave at the near optical axis 690, and the image side surface 642 is convex at the near optical axis 690, and the imaging source side surface 641 is formed. And the image source side surface 642 are all aspherical.

Referring again to Table 11 and Table 12 below.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 11</b></td></tr><tr>< Td> Sixth embodiment </td></tr><tr><td><u>F(</u><u>focal length) = 4.50 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.8 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.335 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.335 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 1.010 </td><td> (ASP) </td><td> 0.518 </td><td> Glass</td><td> 1.694 </td><td> 53.2 </td><td> 2.76 </td></tr><tr><td> 4 </td><td> </td ><td> 1.733 </td><td> (ASP) </td><td> 0.030 </td><td> </td><td> </td ><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 1.663 </td><td > (ASP) </td><td> 0.346 </td><td> Plastic</td><td> 1.636 </td><td> 24.0 </td><td> 3.96 </td></ Tr><tr><td> 6 </td><td> </td><td> 4.872 </td><td> (ASP) </td><td> 0.623 </td><td> < /td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td>< Td> -0.760 </td><td> (ASP) </td><td> 0.256 </td><td> Plastic </td><td> 1.636 </td><td> 24.0 </td> <td> -0.61 </td></tr><tr><td> 8 </td><td> </td><td> 0.821 </td><td> (ASP) </td>< Td> 0.451 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td> <td> Fourth lens</td><td> -3.535 </td><td> (ASP) </td><td> 0.593 </td><td> Plastic </td><td> 1.636 < /td><td> 24.0 </td><td> 1.51 </td></tr><tr><td> 10 </td><td> </td><td> -0.780 </td> <td> (ASP) </td><td> 0.510 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 11 </td><td> Image source surface </td><td> Plane</td><td> </td><td> </td><td> </td> <td> </td><td> </td ></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 12</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -3.0751E-01 </td><td> -8.2747E-01 </td><td> - 1.6824E-02 </td><td> -7.0384E+01 </td></tr><tr><td> A: </td><td> -1.0014E-03 </td><td > 6.0922E-03 </td><td> 1.8296E-02 </td><td> 7.5911E-02 </td></tr><tr><td> B: </td><td> 4.1447E-02 </td><td> 1.9652E-01 </td><td> 6.6535E-02 </td><td> 4.6670E-01 </td></tr><tr><td > C: </td><td> -1.3627E-01 </td><td> -3.2552E+00 </td><td> -1.3207E+00 </td><td> -2.9461E+ 00 </td></tr><tr><td> D: </td><td> -1.6963E-01 </td><td> 1.7963E+01 </td><td> 9.5068E+ 00 </td><td> 4.4903E-01 </td></tr><tr><td> E: </td><td> 1.3831E+00 </td><td> -4.8798E+ 01 </td><td> -3.3256E+01 </td><td> 3.4056E+01 </td></tr><tr><td> F: </td><td> -2.3696E +00 </td><td> 6.5069E+01 </td><td> 5.7424E+01 </td><td> -9.2660E+01 </td></tr><tr><td> G: </td><td> 1.2103E+00 </td><td> -3 .4413E+01 </td><td> -3.8750E+01 </td><td> 7.3346E+01 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 </td><td> 9 </td><td> 10 </td></tr><tr><td> K: </td><td> -1.1416E +01 </td><td> 1.9567E+00 </td><td> -1.0000E+02 </td><td> -7.1146E-01 </td></tr><tr><td > A: </td><td> -1.3078E+00 </td><td> 3.6756E+00 </td><td> -3.4264E-01 </td><td> -4.7921E-01 </td></tr><tr><td> B: </td><td> -4.4991E+01 </td><td> -1.3521E+02 </td><td> -5.1362E +00 </td><td> -1.5559E+00 </td></tr><tr><td> C: </td><td> 1.6637E+03 </td><td> 4.7624E +03 </td><td> 5.4073E+01 </td><td> 2.1561E+01 </td></tr><tr><td> D: </td><td> -2.9956E +04 </td><td> -9.4572E+04 </td><td> -2.8842E+02 </td><td> -1.2944E+02 </td></tr><tr>< Td> E: </td><td> 2.9324E+05 </td><td> 1.0461E+06 </td><td> 8.9236E+02 </td><td> 3.8732E+02 </ Td></tr><tr><td> F: </td><td> -1.4833E+06 </td><td> -5.9625E+06 </td><td> -1.4346E+03 </td><td> -5.8604E+02 </td></tr><tr><td> G: </td><td> 3.0207E+06 </td><td> 1.3534E+07 </td><td> 9.1668E+02 </td><td> 3.4941E+02 </td>< /tr></TBODY></TABLE>

In the sixth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 11 and Table 12:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Sixth embodiment</td></tr><tr><td> f[mm ] </td><td> 4.50 </td><td> f1/f23 </td><td> -2.69 </td></tr><tr><td> Fno </td><td> 2.8 </td><td> f12/f34 </td><td> 0.12 </td></tr><tr><td> FOV[deg.] </td><td> 12.8 </td> <td> f1/f234 </td><td> 0.39 </td></tr><tr><td> f/f1 </td><td> 1.63 </td><td> f123/f4 < /td><td> 4.03 </td></tr><tr><td> f/f234 </td><td> 0.64 </td><td> R1/R2 </td><td> 0.58 </td></tr><tr><td> f1/f2 </td><td> 0.70 </td><td> R3/R4 </td><td> 0.34 </td></tr ><tr><td> f2/f3 </td><td> -6.53 </td><td> R5/R6 </td><td> -0.93 </td></tr><tr>< Td> f3/f4 </td><td> -0.40 </td><td> R7/R8 </td><td> 4.53 </td></tr><tr><td> f1/f3 < /td><td> -4.54 </td><td> f/TL </td><td> 1.35 </td></tr><tr><td> f2/f4 </td><td> 2.62 </td><td> </td><td> </td></tr></TBODY></TABLE>

<Seventh embodiment>

Please refer to FIG. 7A and FIG. 7B , wherein FIG. 7A is a schematic diagram of a four-chip infrared single-wavelength projection lens set according to a seventh embodiment of the present invention, and FIG. 7B is a four-piece type of the seventh embodiment from left to right. Image curvature and distortion curve of infrared single-wavelength projection lens set. As can be seen from FIG. 7A, the four-chip infrared single-wavelength projection lens assembly includes an aperture 700 and an optical group. The optical group sequentially includes a first lens 710, a second lens 720, and a third from the imaging source side to the image source side. The lens 730, the fourth lens 740, and the image source surface 780, wherein the four-chip infrared single-wavelength projection lens group has four refractive lenses. The aperture 700 is disposed between the imaging source side surface 711 and the image source side surface 712 of the first lens 710.

The first lens 710 has a positive refractive power and is made of a glass material. The imaging source side surface 711 is convex at the near optical axis 790, and the source side surface 712 is concave at the near optical axis 790, and the imaging source side surface 711 And the image source side surface 712 are all aspherical.

The second lens 720 has a positive refractive power and is made of a plastic material. The imaging source side surface 721 is convex at the near optical axis 790, and the source side surface 722 is concave at the near optical axis 790, and the imaging source side surface 721 is formed. And the image source side surface 722 are all aspherical.

The third lens 730 has a negative refractive power and is made of a plastic material, and the imaging source side surface 731 is concave at the near optical axis 790, and the source side surface 732 is concave at the near optical axis 790, and the imaging source side surface 731 is concave. And the image source side surface 732 are all aspherical.

The fourth lens 740 has a positive refractive power and is made of a plastic material, and the imaging source side surface 741 is concave at the near optical axis 790, and the source side surface 742 is convex at the near optical axis 790, and the imaging source side surface 741 is formed. And the image source side surface 742 are all aspherical.

Refer to Table 13 and Table 14 below.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 13</b></td></tr><tr>< Td> seventh embodiment </td></tr><tr><td><u>F(</u><u>focal length) = 4.50 mm (mm), Fno (aperture value) = 2.8, FOV (drawn angle) = 12.8 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature</td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Projection </td><td> Plane</td><td> 700 </td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Plane</td><td> 0.332 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> aperture</td ><td> Plane</td><td> -0.332 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 3 </td><td> First lens</td><td> 1.043 </td><td> (ASP) </td><td> 0.510 </td><td> Glass</td><td> 1.806 </td><td> 40.7 </td><td> 2.64 </td></tr><tr><td> 4 </td><td> </td ><td> 1.645 </td><td> (ASP) </td><td> 0.030 </td><td> </td><td> </td ><td> </td><td> </td></tr><tr><td> 5 </td><td> second lens</td><td> 1.130 </td><td > (ASP) </td><td> 0.426 </td><td> Plastic</td><td> 1.643 </td><td> 22.5 </td><td> 4.52 </td></ Tr><tr><td> 6 </td><td> </td><td> 1.622 </td><td> (ASP) </td><td> 0.397 </td><td> < /td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td>< Td> -1.440 </td><td> (ASP) </td><td> 0.210 </td><td> Plastic </td><td> 1.643 </td><td> 22.5 </td> <td> -0.65 </td></tr><tr><td> 8 </td><td> </td><td> 0.594 </td><td> (ASP) </td>< Td> 0.661 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td> <td> Fourth lens</td><td> -5.063 </td><td> (ASP) </td><td> 0.599 </td><td> Plastic </td><td> 1.643 < /td><td> 22.5 </td><td> 1.60 </td></tr><tr><td> 10 </td><td> </td><td> -0.864 </td> <td> (ASP) </td><td> 0.500 </td><td> </td><td> </td><td> </td><td> </td></tr> <tr><td> 11 </td><td> Image source surface </td><td> Plane</td><td> </td><td> </td><td> </td> <td> </td><td> </td ></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 14</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> surface </td><td> 3 </td><td> 4 </td><td> 5 </td><td > 6 </td></tr><tr><td> K: </td><td> -2.7729E-01 </td><td> 2.4374E+00 </td><td> 1.1828E +00 </td><td> -1.6507E+01 </td></tr><tr><td> A: </td><td> -1.0414E-03 </td><td> - 1.3611E-01 </td><td> -9.1367E-02 </td><td> 3.7484E-01 </td></tr><tr><td> B: </td><td> 3.2010E-01 </td><td> 5.9758E+00 </td><td> 6.2869E+00 </td><td> -2.8300E+00 </td></tr><tr>< Td> C: </td><td> -1.4933E+00 </td><td> -4.1173E+01 </td><td> -4.3354E+01 </td><td> 2.8304E+ 01 </td></tr><tr><td> D: </td><td> 4.1256E+00 </td><td> 1.5852E+02 </td><td> 1.7423E+02 </td><td> -2.1032E+02 </td></tr><tr><td> E: </td><td> -5.8878E+00 </td><td> -3.6446E +02 </td><td> -4.4130E+02 </td><td> 7.4854E+02 </td></tr><tr><td> F: </td><td> 3.8611E +00 </td><td> 4.4588E+02 </td><td> 6.0397E+02 </td><td> -1.3477E+03 </td></tr><tr><td> G: </td><td> -9.0185E-01 </td><td> - 2.2155E+02 </td><td> -3.5008E+02 </td><td> 1.0012E+03 </td></tr><tr><td> Surface </td><td> 7 </td><td> 8 </td><td> 9 </td><td> 10 </td></tr><tr><td> K: </td><td> -8.2237E -01 </td><td> -4.0388E-02 </td><td> 5.5397E+01 </td><td> -5.4694E-01 </td></tr><tr><td > A: </td><td> -2.5237E+00 </td><td> -3.3472E-02 </td><td> -3.0948E-01 </td><td> -6.0601E- 01 </td></tr><tr><td> B: </td><td> 1.1430E+01 </td><td> -2.5227E+01 </td><td> 9.6788E- 01 </td><td> 2.9079E+00 </td></tr><tr><td> C: </td><td> -3.1643E+02 </td><td> 5.6137E+ 02 </td><td> -1.3468E+00 </td><td> -1.1846E+01 </td></tr><tr><td> D: </td><td> 5.2875E +03 </td><td> -3.7369E+03 </td><td> -2.0481E+01 </td><td> 1.9638E+01 </td></tr><tr><td > E: </td><td> -4.3403E+04 </td><td> 4.8016E+03 </td><td> 8.4776E+01 </td><td> 7.4823E+00 </ Td></tr><tr><td> F: </td><td> 1.7398E+05 </td><td> 3.8535E+04 </td><td> -5.9395E+01 </ Td><td> -7.5740E+01 </td></tr><tr><td> G: </td><td> -2.6073E+05 </td><td> 4.8372E+04 < /td><td> -3.5374E+01 </td><td> 7.7935E+01 </td> </tr></TBODY></TABLE>

In the seventh embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 13 and Table 14:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Seventh embodiment</td></tr><tr><td> f[mm ] </td><td> 4.50 </td><td> f1/f23 </td><td> -2.44 </td></tr><tr><td> Fno </td><td> 2.8 </td><td> f12/f34 </td><td> 0.29 </td></tr><tr><td> FOV[deg.] </td><td> 12.8 </td> <td> f1/f234 </td><td> 0.51 </td></tr><tr><td> f/f1 </td><td> 1.71 </td><td> f123/f4 < /td><td> 3.78 </td></tr><tr><td> f/f234 </td><td> 0.87 </td><td> R1/R2 </td><td> 0.63 </td></tr><tr><td> f1/f2 </td><td> 0.58 </td><td> R3/R4 </td><td> 0.70 </td></tr ><tr><td> f2/f3 </td><td> -6.92 </td><td> R5/R6 </td><td> -2.43 </td></tr><tr>< Td> f3/f4 </td><td> -0.41 </td><td> R7/R8 </td><td> 5.86 </td></tr><tr><td> f1/f3 < /td><td> -4.04 </td><td> f/TL </td><td> 1.35 </td></tr><tr><td> f2/f4 </td><td> 2.83 </td><td> </td><td> </td></tr></TBODY></TABLE>

The four-piece infrared single-wavelength projection lens set provided by the invention can be made of plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the four-piece infrared can be added. The single-wavelength projection lens sets the degree of freedom in the flexural force configuration and reduces the overall effect of ambient temperature on the lens. In addition, the imaging source side surface and the image source side surface of the lens in the four-chip infrared single-wavelength projection lens group may be aspherical, and the aspheric surface can be easily formed into a shape other than a spherical surface, and more control variables are obtained to reduce the image. The difference, which in turn reduces the number of lenses used, can effectively reduce the overall length of the four-piece infrared single wavelength projection lens set of the present invention.

In the four-piece infrared single-wavelength projection lens set provided by the present invention, in the case of a lens having a refractive power, if the lens surface is convex and the convex position is not defined, it indicates that the lens surface is at the low optical axis. If the surface of the lens is concave and the position of the concave surface is not defined, it indicates that the surface of the lens is concave at the low beam axis.

The four-chip infrared single-wavelength projection lens set provided by the invention is more suitable for the optical system of moving focus, and has the characteristics of excellent aberration correction and good imaging quality, and can be applied to 3D (three-dimensional) images in various aspects. In electronic imaging systems such as digital cameras, digital cameras, digital devices, or car photography.

In the above, the above embodiments and drawings are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention are all It should be within the scope of the patent of the present invention.

100, 200, 300, 400, 500, 600, 700‧‧ ‧ aperture

110, 210, 310, 410, 510, 610, 710‧‧‧ first lens

111, 211, 311, 411, 511, 611, 711 ‧ ‧ imaging source side surface

112, 212, 312, 412, 512, 612, 712‧‧‧ source side surface

120, 220, 320, 420, 520, 620, 720‧‧‧ second lens

121, 221, 321, 421, 521, 621, 721 ‧ ‧ imaging source side surface

122, 222, 322, 422, 522, 622, 722‧‧‧ source side surface

130, 230, 330, 430, 530, 630, 730 ‧ ‧ third lens

131, 231, 331, 431, 531, 631, 731 ‧ ‧ imaging source side surface

132, 232, 332, 432, 532, 632, 732‧‧‧ source side surface

140, 240, 340, 440, 540, 640, 740 ‧ ‧ fourth lens

141, 241, 341, 441, 541, 641, 741‧‧ ‧ imaging source side surface

142, 242, 342, 442, 542, 642, 742 ‧ ‧ source side surface

180, 280, 380, 480, 580, 680, 780‧‧‧ source side

190, 290, 390, 490, 590, 690, 790‧‧ ‧ optical axis

f‧‧‧Focus of four-piece infrared single-wavelength projection lens set

Aperture value of Fno‧‧‧4-piece infrared single-wavelength projection lens set

Maximum field of view in FOV‧‧‧4-piece infrared single-wavelength projection lens set

F1‧‧‧The focal length of the first lens

F2‧‧‧The focal length of the second lens

f3‧‧‧The focal length of the third lens

F4‧‧‧The focal length of the fourth lens

F12‧‧‧Combined focal length of the first lens and the second lens

F23‧‧‧Combined focal length of the second lens and the third lens

F34‧‧‧Combined focal length of the third lens and the fourth lens

F123‧‧‧Combined focal length of the first lens, the second lens and the third lens

f234‧‧‧Combined focal length of the second lens, the third lens and the fourth lens

Radius of curvature of the source side surface of the first lens of R1‧‧‧

R2‧‧‧ Image source side surface radius of curvature of the first lens

R3‧‧‧ Imaging lens side surface radius of curvature of the second lens

R4‧‧‧ Image source side surface radius of curvature of the second lens

Radius of curvature of the source side surface of the R5‧‧‧ third lens

R6‧‧‧ Image source side surface radius of curvature of the third lens

Radius of curvature of the source side surface of the R7‧‧‧ fourth lens

The radius of curvature of the image source side surface of the R8‧‧‧ fourth lens

TL‧‧‧Distance of the source side surface of the first lens to the image source side surface on the optical axis

1A is a schematic view of a four-piece infrared single-wavelength projection lens set according to a first embodiment of the present invention. FIG. 1B is a graph showing the curvature of field and the distortion of the distortion of the four-chip infrared single-wavelength projection lens group of the first embodiment from left to right. 2A is a schematic view of a four-piece infrared single-wavelength projection lens set according to a second embodiment of the present invention. 2B is a graph showing the curvature of field and the distortion of the distortion of the four-piece infrared single-wavelength projection lens group of the second embodiment from left to right. 3A is a schematic view of a four-piece infrared single-wavelength projection lens set according to a third embodiment of the present invention. FIG. 3B is a graph showing the curvature of field and the distortion of the distortion of the four-piece infrared single-wavelength projection lens set of the third embodiment from left to right. 4A is a schematic view of a four-piece infrared single-wavelength projection lens set according to a fourth embodiment of the present invention. 4B is a graph showing the curvature of field and the distortion of the distortion of the four-piece infrared single-wavelength projection lens group of the fourth embodiment from left to right. Figure 5A is a schematic illustration of a four-piece infrared single wavelength projection lens set in accordance with a fifth embodiment of the present invention. FIG. 5B is a graph showing the curvature of field and the distortion of the distortion of the four-piece infrared single-wavelength projection lens group of the fifth embodiment from left to right. 6A is a schematic view of a four-piece infrared single-wavelength projection lens set according to a sixth embodiment of the present invention. FIG. 6B is a graph showing the curvature of field and the distortion of the distortion of the four-chip infrared single-wavelength projection lens set of the sixth embodiment from left to right. 7A is a schematic view of a four-piece infrared single-wavelength projection lens set according to a seventh embodiment of the present invention. 7B is a graph showing the curvature of field and the distortion of the distortion of the four-piece infrared single-wavelength projection lens group of the seventh embodiment from left to right.

Claims (18)

A four-piece infrared single-wavelength projection lens set comprises, in order from the imaging source side to the image source side: an aperture; a first lens having a positive refractive power and being made of glass, the imaging source side surface being at the near optical axis a convex surface, wherein at least one surface of the image source side surface and the image source side surface is aspherical; a second lens having a refractive power, the imaging source side surface being convex at a near optical axis, and the source side surface being at a near optical axis a concave surface whose at least one surface of the image source side surface and the image source side surface is aspherical; a third lens having a negative refractive power, the imaging source side surface being a concave surface at the near optical axis, and the source side surface at the near optical axis a concave surface whose at least one surface of the image source side surface and the image source side surface is aspherical; a fourth lens having a positive refractive power, the imaging source side surface having a concave surface at the near optical axis, and the source side surface near the optical axis At a convex surface, at least one surface of the image source side surface and the image source side surface is aspherical. The four-chip infrared single-wavelength projection lens set according to claim 1, wherein the overall focal length of the four-chip infrared single-wavelength projection lens group is f, the focal length of the first lens is f1, and the following condition is satisfied: 1.0< f/f1 < 4.0. The four-chip infrared single-wavelength projection lens set according to claim 1, wherein the overall focal length of the four-chip infrared single-wavelength projection lens group is f, and the composite focal length of the second lens, the third lens and the fourth lens is F234, and the following conditions are met: 0.35 < f/f234 < 1.2. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the first lens has a focal length of f1, the second lens has a focal length of f2, and satisfies the following condition: -0.81 < f1/f2 < 1.1. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the second lens has a focal length of f2, the third lens has a focal length of f3, and satisfies the following condition: -72.3 < f2/f3 < 5.6. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following condition is satisfied: -0.67 < f3/f4 < -0.20 . The four-chip infrared single-wavelength projection lens set according to claim 1, wherein the first lens has a focal length of f1, the third lens has a focal length of f3, and satisfies the following condition: -4.9 < f1/f3 < -1.6 . The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the second lens has a focal length of f2, the fourth lens has a focal length of f4, and satisfies the following condition: -2.5 < f2/f4 < 29.8. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein a focal length of the first lens is f1, a combined focal length of the second lens and the third lens is f23, and the following condition is satisfied: -4.1 < f1 /f23 < -1.4. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein a composite focal length of the first lens and the second lens is f12, and a combined focal length of the third lens and the fourth lens is f34, and the following conditions are met. :0.05 < f12/f34 < 0.79. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the focal length of the first lens is f1, and the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following conditions are met: 0.07 < f1/f234 < 0.62. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens has a focal length of f4, and the following conditions are met: 2.8 < f123/f4 < 5.3. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the first lens has an imaging source side surface having a radius of curvature R1, and the image source side surface of the first lens has a radius of curvature of R2, and satisfies the following conditions: :-0.9 < R1/R2 < 0.9. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the imaging lens side surface has a radius of curvature R3, the second lens has a source side surface curvature radius of R4, and satisfies the following conditions: :0.1 < R3/R4 < 3.6. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the imaging lens side surface has a radius of curvature R5, the third lens has a source side surface curvature radius of R6, and satisfies the following conditions: :-3.9 < R5/R6 < -0.6. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the imaging lens side surface has a radius of curvature R7, and the fourth lens has a source side surface curvature radius of R8, and satisfies the following conditions: :3.5 < R7/R8 < 29.2. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the overall focal length of the four-piece infrared single-wavelength projection lens group is f, and the imaging source side surface to the image source side surface of the first lens is light. The distance on the axis is TL and the following conditions are met: 1.0 < f/TL < 1.67. The four-piece infrared single-wavelength projection lens set according to claim 1, wherein the first lens has a refractive index of n1, the second lens has a refractive index of n2, and the third lens has a refractive index of n3. The four lenses have a refractive index of n4 and satisfy the following conditions: n1, n2, n3, n4>1.6.