CN113835191B - Five-piece infrared single focus lens group - Google Patents

Abstract

The present invention is a five-piece infrared single-focus lens group, which includes: aperture; the first lens with positive refractive power; the second lens; the third lens with positive refractive power; the fourth lens from the object side to the image side lens; and a fifth lens; wherein the focal length of the first lens is f1, the focal length of the third lens is f3, the thickness of the first lens on the optical axis is CT1, and the thickness of the third lens on the optical axis The thickness above is CT3, the radius of curvature of the object-side surface of the first lens is R1, and the curvature radius of the object-side surface of the third lens is R5, and the following conditions are satisfied: -1.60<(f1×CT1×R1)/ (f3×CT3×R5)<2.43. Therefore, the present invention provides a five-piece infrared single-focus lens with wide viewing angle, high resolution capability, short lens length, and small distortion.

Description

Five-piece infrared single focus lens group

technical field

The invention relates to a five-piece lens group, in particular to a miniaturized five-piece infrared single-focus lens group applied to electronic products.

Background technique

Today's digital image technology is constantly innovating and changing, especially in the miniaturization of digital carriers such as digital cameras and mobile phones, and the photosensitive components such as CCD or CMOS are also required to be more miniaturized. In the application of infrared focusing lenses, in addition to using In the field of photography, it has also been widely used in the field of infrared receiving and sensing of game machines in recent years. In order to make the range of game machines sensing users wider, most of the lens groups that receive infrared wavelengths currently use lenses with larger picture angles. Wide-angle lenses are the mainstream.

Among them, the applicant also previously proposed a number of lens sets related to infrared wavelength reception, but the current game consoles mainly focus on 3D games that are more three-dimensional, realistic and immersive, so the current or the applicant’s previous lens sets are all 2D The detection of plane games is a requirement, so that it cannot meet the depth sensing function that 3D games focus on.

Furthermore, for the infrared receiving and sensing lens sets dedicated to game consoles, plastic lenses are used in pursuit of low cost. First, the poor light transmission of the material is one of the key factors affecting the lack of depth detection accuracy of game consoles. Second, plastic lenses are easy to detect. When the ambient temperature is too hot or too cold, the focal length of the lens group changes and cannot be accurately focused. As mentioned above, the current infrared wavelength receiving lens group cannot meet the two technical issues of accurate sensing of depth and distance in 3D games.

In view of this, how to provide an accurate depth detection and reception, and how to prevent the focal length of the lens group from affecting the depth detection effect is the technical bottleneck that the infrared wavelength receiving lens group is eager to overcome.

Contents of the invention

The object of the present invention is to provide a five-piece infrared single-focus lens set, especially a four-piece infrared single-wavelength lens set with improved picture angle, high resolution, short lens length, and small distortion.

In order to achieve the aforementioned purpose, a five-piece infrared single-focus lens group provided by the present invention includes an aperture and an optical group composed of five lenses, and the sequence from the object side to the image side is: the aperture; A lens with positive refractive power, the object-side surface of the first lens near the optical axis is convex, at least one of the object-side surface and the image-side surface of the first lens is aspheric; the second lens has a refractive The near optical axis of the object side surface of the second lens is concave, the image side surface of the second lens is convex near the optical axis, and at least one of the object side surface and the image side surface of the second lens is It is an aspherical surface; the third lens has a positive refractive power, and at least one surface of the object-side surface and the image-side surface of the third lens is aspherical; the fourth lens has a refractive power, and the object-side surface of the fourth lens is The near optical axis is concave, the image side surface of the fourth lens is convex near the optical axis, at least one of the object side surface and the image side surface of the fourth lens is aspherical; and the fifth lens has a refractive The near optical axis of the object-side surface of the fifth lens is convex, the image-side surface of the fifth lens is concave near the optical axis, and at least one of the object-side surface and the image-side surface of the fifth lens is It is an aspheric surface, at least one of the object-side surface and the image-side surface of the fifth lens has at least one inflection point;

Wherein the focal length of the first lens is f1, the focal length of the third lens is f3, the thickness of the first lens on the optical axis is CT1, and the thickness of the third lens on the optical axis is CT3, so The radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the object-side surface of the third lens is R5, and the following conditions are satisfied: -1.60<(f1×CT1×R1)/(f3×CT3×R5) <2.43.

Preferably, the overall focal length of the five-piece infrared single-focus lens group is f, the focal length of the first lens is f1, and the following conditions are satisfied: 0.9<f1/f<2.2. Thus, the refractive power of the first lens is maintained in an appropriate range, and the angle of view (FOV) of the five-piece infrared single-focus lens group is maintained at an appropriate angle, while reducing the assembly sensitivity of the first lens.

Preferably, the focal length of the first lens is f1, the focal length of the third lens is f3, and the following conditions are satisfied: 0.74<f3/f1<4.30. Accordingly, the five-piece infrared single-focus lens group can have an appropriate distribution of refractive power, which is helpful for adjusting the viewing angle and compressing the volume.

Preferably, the composite focal length of the first lens and the second lens is f12, the focal length of the third lens is f3, and the following conditions are satisfied: 0.28<f12/f3<3.07. Thus, the resolution capability of the five-piece infrared single-focus lens group is improved.

Preferably, the composite focal length of the first lens and the second lens is f12, the composite focal length of the first lens, the second lens, the third lens and the fourth lens is f1234, and the following conditions are satisfied: 0.70< f12/f1234<3.91. Accordingly, the five-piece infrared single-focus lens group can have a large viewing angle, and at the same time, the resolution capability is significantly improved.

Preferably, the overall focal length of the five-piece infrared single-focus lens group is f, the composite focal length of the first lens, the second lens and the third lens is f123, and the following conditions are satisfied: 0.36<f/f123 <1.33. Thus, light with a wider viewing angle can be incident on the five-piece infrared single-focus lens group, so as to improve the peripheral illumination and expand the viewing angle.

Preferably, the focal length of the first lens is f1, the radius of curvature of the object-side surface of the first lens is R1, and the following conditions are satisfied: 0.98<f1/R1<2.97. Thus, it is helpful to regulate the incident light, especially for the incident light with a large viewing angle.

Preferably, the radius of curvature of the image-side surface of the second lens is R4, the radius of curvature of the object-side surface of the second lens is R3, and the following conditions are satisfied: 0.71<R4/R3<2.75. Thus, image curvature can be corrected, and imaging quality can be improved.

Preferably, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, and the following conditions are satisfied: 0.38<R7/R8<7.81. Thus, image curvature can be corrected, and imaging quality can be improved.

Preferably, the radius of curvature of the object-side surface of the fifth lens is R9, the radius of curvature of the image-side surface of the fifth lens is R10, and the following conditions are satisfied: 0.66<R9/R10<1.75. Thereby, the change of the thickness of the fifth lens from the near optical axis to the off-axis can be slowed down, and the situation of poor molding caused by the excessive thickness difference at the off-axis can be alleviated.

Preferably, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, and the following conditions are satisfied: -15.0<f3/R5<4.9. Thereby, lens formability is improved.

Preferably, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the thickness of the second lens on the optical axis is CT2, and the thickness of the third lens on the optical axis is The thickness is CT3, the thickness of the fourth lens on the optical axis is CT4, and the following condition is satisfied: 2.5<TL/(CT2+CT3+CT4)<8.1. Therefore, it is beneficial to maintain the miniaturization of the five-piece infrared single-focus lens group so as to be mounted on light and thin electronic products.

Preferably, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the overall focal length of the five-piece infrared single-focus lens group is f, and the following conditions are met: 1.06<TL /f<2.07. Therefore, it is beneficial to obtain a wide range of picture angles (field of view) and to maintain the miniaturization of the five-piece infrared single-focus lens group, so that it can be mounted on thin and light electronic products.

Preferably, the distance from the image-side surface of the fifth lens to the imaging plane on the optical axis is BFL, and the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, and satisfies the following Condition: 0.15<BFL/TL<0.39. Thereby, an appropriate back focus can be obtained.

Preferably, the distance on the optical axis from the object-side surface of the first lens to the imaging plane is TL, and half of the imaging height that can be captured by the five-piece infrared single-focus lens group on the imaging plane is IMH, And meet the following conditions: 1.4<TL/IMH<2.6. Therefore, a balance can be achieved between reducing the volume of the five-piece infrared single-focus lens group and increasing the area of the imaging surface.

Preferably, the focal length of the first lens is f2, the thickness of the second lens on the optical axis is CT2, the radius of curvature of the object-side surface of the second lens is R3, and the image side of the second lens is The radius of curvature of the surface is R4, and the following condition is satisfied: -1.72<f2×CT2/(R3×R4)<0.48. Lens formability is thereby improved.

Description of drawings

FIG. 1A is a schematic diagram of a five-piece infrared single-focus lens set according to the first embodiment of the present invention.

FIG. 1B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the first embodiment.

FIG. 2A is a schematic diagram of a five-piece infrared single-focus lens set according to a second embodiment of the present invention.

FIG. 2B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the second embodiment.

FIG. 3A is a schematic diagram of a five-piece infrared single-focus lens group according to a third embodiment of the present invention.

FIG. 3B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the third embodiment.

FIG. 4A is a schematic diagram of a five-piece infrared single-focus lens group according to a fourth embodiment of the present invention.

FIG. 4B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the fourth embodiment.

FIG. 5A is a schematic diagram of a five-piece infrared single-focus lens group according to a fifth embodiment of the present invention.

FIG. 5B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the fifth embodiment.

FIG. 6A is a schematic diagram of a five-piece infrared single-focus lens group according to the sixth embodiment of the present invention.

FIG. 6B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the sixth embodiment.

FIG. 7A is a schematic diagram of a five-piece infrared single-focus lens group according to a seventh embodiment of the present invention.

FIG. 7B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the seventh embodiment.

FIG. 8A is a schematic diagram of a five-piece infrared single-focus lens group according to the eighth embodiment of the present invention.

FIG. 8B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the eighth embodiment.

FIG. 9A is a schematic diagram of a five-piece infrared single-focus lens group according to the ninth embodiment of the present invention.

FIG. 9B is, from left to right, the field curvature and distortion aberration curves of the five-element infrared single-focus lens set of the ninth embodiment.

Explanation of symbols in the accompanying drawings:

100, 200, 300, 400, 500, 600, 700, 800, 900: Aperture

110, 210, 310, 410, 510, 610, 710, 810, 910: first lens

111, 211, 311, 411, 511, 611, 711, 811, 911: object side surface

112, 212, 312, 412, 512, 612, 712, 812, 912: image side surface

120, 220, 320, 420, 520, 620, 720, 820, 920: second lens

121, 221, 321, 421, 521, 621, 721, 821, 921: object side surface

122, 222, 322, 422, 522, 622, 722, 822, 922: image side surface

130, 230, 330, 430, 530, 630, 730, 830, 930: third lens

131, 231, 331, 431, 531, 631, 731, 831, 931: object side surface

132, 232, 332, 432, 532, 632, 732, 832, 932: image side surface

140, 240, 340, 440, 540, 640, 740, 840, 940: fourth lens

141, 241, 341, 441, 541, 641, 741, 841, 941: object side surface

142, 242, 342, 442, 542, 642, 742, 842, 942: image side surface

150, 250, 350, 450, 550, 650, 750, 850, 950: fifth lens

151, 251, 351, 451, 551, 651, 751, 851, 951: object side surface

152, 252, 352, 452, 552, 652, 752, 852, 952: image side surface

160, 260, 360, 470, 570, 670, 770, 870, 970: Infrared bandpass components

180, 280, 380, 480, 580, 680, 780, 880, 980: imaging surface

190, 290, 390, 490, 590, 690, 790, 890, 990: optical axis

f: focal length of the five-piece infrared single-focus lens group

Fno: the aperture value of the five-element infrared single-focus lens group

FOV: The largest field of view among the five-piece infrared single-focus lens group

f1: focal length of the first lens

f2: focal length of the second lens

f3: focal length of the third lens

f12: composite focal length of the first lens and the second lens

f123: composite focal length of the first lens, the second lens and the third lens

f1234: composite focal length of the first lens, the second lens, the third lens and the fourth lens

R1: radius of curvature of the object-side surface of the first lens

R3: The radius of curvature of the object-side surface of the second lens

R4: Radius of curvature of the image-side surface of the second lens

R5: Radius of curvature of the object-side surface of the third lens

R7: Radius of curvature of the object-side surface of the fourth lens

R8: Radius of curvature of the image-side surface of the fourth lens

R9: radius of curvature of the object-side surface of the fifth lens

R10: Radius of curvature of the image-side surface of the fifth lens

CT2: The thickness of the second lens on the optical axis

CT3: The thickness of the third lens on the optical axis

CT4: The thickness of the fourth lens on the optical axis

TL: the distance from the object-side surface of the first lens to the imaging plane on the optical axis

IMH: Half of the imaging height that can be captured by the five-element infrared single-focus lens group on the imaging surface

BFL: the distance from the image-side surface of the fifth lens to the imaging surface on the optical axis

detailed description

The technical solution of the present invention will be clearly and completely described below, obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

first embodiment

As shown in Figure 1A and Figure 1B, Figure 1A shows a schematic diagram of a five-piece infrared single-focus lens group according to the first embodiment of the present invention, and Figure 1B shows the five-piece infrared single-focus lens group of the first embodiment from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 1A that the five-piece infrared single-focus lens group includes an aperture 100 and an optical group, and the optical group includes a first lens 110, a second lens 120, a third lens 130, and a first lens 110 from the object side to the image side in sequence. The four lenses 140, the fifth lens 150, the infrared bandpass component 170, and the imaging surface 180, wherein there are five lenses with refractive power in the five-piece infrared single-focus lens group. The aperture 100 is disposed between the subject and the first lens 110 .

The first lens 110 has positive refractive power and is made of plastic material. Its object-side surface 111 is convex near the optical axis 190, and its image-side surface 112 is concave near the optical axis 190. The object-side surface 111 and the image-side surface 112 All are aspherical.

The second lens 120 has negative refractive power and is made of plastic material. Its object-side surface 121 near the optical axis 190 is concave, its image-side surface 122 near the optical axis 190 is convex, and the object-side surface 121 and image-side surface 122 All are aspherical.

The third lens 130 has positive refractive power and is made of plastic material. Its object-side surface 131 is convex near the optical axis 190, and its image-side surface 132 is concave near the optical axis 190. The object-side surface 131 and the image-side surface 132 All are aspherical.

The fourth lens 140 has a positive refractive power and is made of plastic material. Its object side surface 141 near the optical axis 190 is concave, its image side surface 142 near the optical axis 190 is convex, and the object side surface 141 and the image side surface 142 All are aspherical.

The fifth lens 150 has positive refractive power and is made of plastic material. Its object-side surface 151 near the optical axis 190 is convex, its image-side surface 152 near the optical axis 190 is concave, and the object-side surface 151 and image-side surface 152 Both are aspherical, and both the object-side surface 151 and the image-side surface 152 have at least one inflection point.

The infrared band-pass component 170 is made of glass, and is disposed between the fifth lens 150 and the imaging surface 180 without affecting the focal length of the five-piece infrared single-focus lens group.

The curve equations of the aspheric surfaces of the above-mentioned lenses are expressed as follows:

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

In the five-piece infrared single-focus lens group of the first embodiment, the focal length of the five-piece infrared single-focus lens group is f, and the aperture value (f-number) of the five-piece infrared single-focus lens group is Fno. The maximum field of view (picture angle) in the infrared single-focus lens group is FOV, and its values are as follows: f=3.64 (mm); Fno=1.45; and FOV=73.0 (degrees).

In the five-piece infrared single-focus lens group of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the third lens 130 is f3, the thickness of the first lens 110 on the optical axis 190 is CT1, and the third lens The thickness of 130 on the optical axis 190 is CT3, the radius of curvature of the object side surface 111 of the first lens 110 is R1, the curvature radius of the object side surface 131 of the third lens 130 is R5, and the following conditions are satisfied: (f1×CT1×R1 )/(f3×CT3×R5)=0.50.

In the five-piece infrared single-focus lens group of the first embodiment, the overall focal length of the five-piece infrared single-focus lens group is f, the focal length of the first lens 110 is f1, and the following conditions are satisfied: f1/f=1.26 .

In the five-piece infrared single-focus 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: f3/f1=3.58.

In the five-piece infrared single-focus lens group of the first embodiment, the composite focal length of the first lens 110 and the second lens 120 is f12, the focal length of the third lens 130 is f3, and the following condition is satisfied: f12/f3=0.50.

In the five-piece infrared single-focus lens group of the first embodiment, the combined focal length of the first lens 110 and the second lens 120 is f12, and the focal length of the first lens 110, the second lens 120, the third lens 130 and the fourth lens 140 The composite focal length is f1234, and the following condition is satisfied: f12/f1234=1.33.

In the five-piece infrared single-focus lens group of the first embodiment, the overall focal length of the five-piece infrared single-focus lens group is f, and the combined focal length of the first lens 110, the second lens 120 and the third lens 130 is f123 , and satisfy the following conditions: f/f123=0.60.

In the five-piece infrared single-focus lens group of the first embodiment, the focal length of the first lens 110 is f1, the radius of curvature of the object-side surface 111 of the first lens 110 is R1, and the following conditions are satisfied: f1/R1=1.67.

In the five-piece infrared single-focus lens group of the first embodiment, the radius of curvature of the second lens 120 image side surface 122 is R4, the radius of curvature of the object side surface 121 of the second lens 120 is R3, and satisfies the following conditions: R4/ R3 = 2.10.

In the five-piece infrared single-focus lens group of the first embodiment, the radius of curvature of the object side surface 141 of the fourth lens 140 is R7, the radius of curvature of the image side surface 142 of the fourth lens 140 is R8, and satisfies the following conditions: R7/ R8 = 0.94.

In the five-piece infrared single-focus lens group of the first embodiment, the radius of curvature of the object side surface 151 of the fifth lens 150 is R9, the radius of curvature of the image side surface 152 of the fifth lens 150 is R10, and meets the following conditions: R9/ R10 = 0.93.

In the five-piece infrared single-focus lens set of the first embodiment, the focal length of the third lens 130 is f3, the radius of curvature of the object-side surface 131 of the third lens 130 is R5, and the following conditions are satisfied: f3/R5=3.59.

In the five-piece infrared single-focus lens group of the first embodiment, the distance from the object-side surface 111 of the first lens 110 to the imaging surface 180 on the optical axis 190 is TL, and the thickness of the second lens 120 on the optical axis 190 is CT2, the thickness of the third lens 130 on the optical axis 190 is CT3, the thickness of the fourth lens 140 on the optical axis 190 is CT4, and the following condition is satisfied: TL/(CT2+CT3+CT4)=6.15.

In the five-piece infrared single-focus lens group of the first embodiment, the distance from the object-side surface 111 of the first lens 110 to the imaging surface 180 on the optical axis 190 is TL, and the entirety of the five-piece infrared single-focus lens group The focal length is f, and the following condition is satisfied: TL/f=1.44.

In the five-piece infrared single-focus lens group of the first embodiment, the distance from the image-side surface 152 of the fifth lens 150 to the imaging plane 180 on the optical axis 190 is BFL, and the distance from the object-side surface 111 of the first lens 110 to the imaging plane The distance of 180 on the optical axis 190 is TL, and the following condition is satisfied: BFL/TL=0.32.

In the five-piece infrared single-focus lens group of the first embodiment, the distance from the object-side surface 111 of the first lens 110 to the imaging surface 180 on the optical axis 190 is TL, and the five-piece infrared single-focus lens group is imaging Half of the image height that can be captured by the surface 180 is IMH, and the following condition is satisfied: TL/IMH=1.91.

In the five-piece infrared single-focus lens group of the first embodiment, the focal length of the first lens 110 is f2, the thickness of the second lens 120 on the optical axis 190 is CT2, and the radius of curvature of the object side surface 121 of the second lens 120 is R3, the radius of curvature of the image-side surface 122 of the second lens 120 is R4, and satisfies the following condition: f2×CT2/(R3×R4)=−0.19.

Then refer to Table 1 and Table 2 below.

Table 1 is the detailed structural data of the first embodiment in FIG. 1A, where the units of the radius of curvature, thickness and focal length are mm, and surfaces 0-15 represent the surfaces from the object side to the image side in sequence, and also include the test surface ( i.e. surface 1). Table 2 is the aspheric surface data in the first embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A, B, C, D, E, F, G... are high-order aspheric coefficients. In addition, the tables of the following embodiments are schematic diagrams and curves of field curvature and distortion curves corresponding to each embodiment. The definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment. Add repeat.

second embodiment

As shown in Figure 2A and Figure 2B, where Figure 2A shows a schematic diagram of a five-piece infrared single-focus lens group according to the second embodiment of the present invention, and Figure 2B shows the five-piece infrared lens group of the second embodiment in sequence from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 2A that the five-piece infrared single-focus lens group includes an aperture 200 and an optical group, and the optical group includes a first lens 210, a second lens 220, a third lens 230, and a first lens from the object side to the image side in sequence. The four lenses 240, the fifth lens 250, and the infrared bandpass component 280, wherein there are five lenses with refractive power in the five-piece infrared single-focus lens group. The aperture 200 is disposed between the subject and the first lens 210 .

The first lens 210 has positive refractive power and is made of plastic material. Its object-side surface 211 is convex near the optical axis 290, and its image-side surface 212 is convex near the optical axis 290. The object-side surface 211 and the image-side surface 212 All are aspherical.

The second lens 220 has negative refractive power and is made of plastic material. Its object-side surface 221 near the optical axis 290 is concave, its image-side surface 222 near the optical axis 290 is convex, and the object-side surface 221 and the image-side surface 222 All are aspherical.

The third lens 230 has a positive refractive power and is made of plastic material. Its object-side surface 231 near the optical axis 290 is convex, and its image-side surface 232 near the optical axis 290 is concave. The object-side surface 231 and the image-side surface 232 All are aspherical.

The fourth lens 240 has positive refractive power and is made of plastic material. Its object-side surface 241 near the optical axis 290 is concave, its image-side surface 242 near the optical axis 290 is convex, and the object-side surface 241 and the image-side surface 242 All are aspherical.

The fifth lens 250 has negative refractive power and is made of plastic material. Its object-side surface 251 near the optical axis 290 is convex, its image-side surface 252 near the optical axis 290 is concave, and the object-side surface 251 and image-side surface 252 Both are aspherical, and both the object-side surface 251 and the image-side surface 252 have at least one inflection point.

The infrared band-pass component 270 is made of glass, and it is disposed between the fifth lens 250 and the imaging surface 280 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 3 and Table 4 below.

In the second embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 3 and Table 4, the following data can be deduced:

third embodiment

As shown in Figure 3A and Figure 3B, where Figure 3A shows a schematic diagram of a five-piece infrared single-focus lens group according to the third embodiment of the present invention, and Figure 3B is the five-piece infrared single-focus lens group of the third embodiment from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 3A that the five-piece infrared single-focus lens group includes an aperture 300 and an optical group, and the optical group includes a first lens 310, a second lens 320, a third lens 330, and a first lens 310 from the object side to the image side in sequence. The four lenses 340, the fifth lens 350, the infrared bandpass component 370, and the imaging surface 380, wherein the five lenses with refractive power in the five-piece infrared single-focus lens group are five. The aperture 300 is disposed between the subject and the first lens 310 .

The first lens 310 has a positive refractive power and is made of plastic material. Its object-side surface 311 is convex near the optical axis 390, and its image-side surface 312 is concave near the optical axis 390. The object-side surface 311 and the image-side surface 312 All are aspherical.

The second lens 320 has negative refractive power and is made of plastic material. Its object-side surface 321 near the optical axis 390 is concave, its image-side surface 322 near the optical axis 390 is convex, and the object-side surface 321 and the image-side surface 322 All are aspherical.

The third lens 330 has a positive refractive power and is made of plastic material. Its object-side surface 331 is convex near the optical axis 390, and its image-side surface 332 is concave near the optical axis 390. The object-side surface 331 and the image-side surface 332 All are aspherical.

The fourth lens 340 has a negative refractive power and is made of plastic material. Its object-side surface 341 near the optical axis 390 is concave, its image-side surface 342 near the optical axis 390 is convex, and the object-side surface 341 and the image-side surface 342 All are aspherical.

The fifth lens 350 has positive refractive power and is made of plastic material. Its object-side surface 351 near the optical axis 390 is convex, its image-side surface 352 near the optical axis 390 is concave, and the object-side surface 351 and image-side surface 352 Both are aspherical, and both the object-side surface 351 and the image-side surface 352 have at least one inflection point.

The infrared band-pass component 370 is made of glass, and it is disposed between the fifth lens 350 and the imaging surface 380 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 5 and Table 6 below.

In the third embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 5 and Table 6, the following data can be deduced:

Fourth embodiment

As shown in Fig. 4A and Fig. 4B, Fig. 4A shows a schematic diagram of a five-piece infrared single-focus lens group according to the fourth embodiment of the present invention, and Fig. 4B shows the five-piece infrared single-focus lens group of the fourth embodiment from left to right. Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 4A that the five-piece infrared single-focus lens group includes an aperture 400 and an optical group, and the optical group includes a first lens 410, a second lens 420, a third lens 430, and a first lens 410 from the object side to the image side in sequence. Four lenses 440 , fifth lens 450 , infrared band-pass component 470 , and imaging surface 480 , wherein the five lenses with refractive power in the five-piece infrared single-focus lens group are five. The aperture 400 is disposed between the subject and the first lens 410 .

The first lens 410 has positive refractive power and is made of plastic material. Its object-side surface 411 is convex near the optical axis 490, and its image-side surface 412 is convex near the optical axis 490. The object-side surface 411 and the image-side surface 412 All are aspherical.

The second lens 420 has negative refractive power and is made of plastic material. Its object-side surface 421 near the optical axis 490 is concave, its image-side surface 422 near the optical axis 490 is convex, and the object-side surface 421 and image-side surface 422 All are aspherical.

The third lens 430 has a positive refractive power and is made of plastic material. Its object-side surface 431 is convex near the optical axis 490, and its image-side surface 432 is concave near the optical axis 490. The object-side surface 431 and the image-side surface 432 All are aspherical.

The fourth lens 440 has a positive refractive power and is made of plastic material. Its object-side surface 441 near the optical axis 490 is concave, its image-side surface 442 near the optical axis 490 is convex, and the object-side surface 441 and the image-side surface 442 All are aspherical.

The fifth lens 450 has negative refractive power and is made of plastic material. Its object-side surface 451 near the optical axis 490 is convex, its image-side surface 452 near the optical axis 490 is concave, and the object-side surface 451 and image-side surface 452 Both are aspherical, and both the object-side surface 451 and the image-side surface 452 have at least one inflection point.

The infrared band-pass component 470 is made of glass, and it is disposed between the fifth lens 450 and the imaging surface 480 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 7 and Table 8 below.

In the fourth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 7 and Table 8, the following data can be deduced:

fifth embodiment

As shown in Figure 5A and Figure 5B, where Figure 5A shows a schematic diagram of a five-piece infrared single-focus lens group according to the fifth embodiment of the present invention, and Figure 5B shows the five-piece infrared lens group of the fifth embodiment from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 5A that the five-piece infrared single-focus lens group includes an aperture 500 and an optical group, and the optical group includes a first lens 510, a second lens 520, a third lens 530, and a first lens 510 from the object side to the image side in sequence. The four lenses 540, the fifth lens 550, the infrared bandpass component 570, and the imaging surface 580, wherein there are five lenses with refractive power in the five-piece infrared single-focus lens group. The aperture 500 is disposed between the subject and the first lens 510 .

The first lens 510 has positive refractive power and is made of plastic material. Its object-side surface 511 is convex near the optical axis 590, and its image-side surface 512 is convex near the optical axis 590. The object-side surface 511 and the image-side surface 512 All are aspherical.

The second lens 520 has negative refractive power and is made of plastic material. Its object-side surface 521 near the optical axis 590 is concave, its image-side surface 522 near the optical axis 590 is convex, and the object-side surface 521 and the image-side surface 522 All are aspherical.

The third lens 530 has a positive refractive power and is made of plastic material. Its object-side surface 531 near the optical axis 590 is convex, and its image-side surface 532 near the optical axis 590 is concave. The object-side surface 531 and the image-side surface 532 All are aspherical.

The fourth lens 540 has positive refractive power and is made of plastic material. Its object-side surface 541 near the optical axis 590 is concave, its image-side surface 542 near the optical axis 590 is convex, and the object-side surface 541 and the image-side surface 542 All are aspherical.

The fifth lens 550 has positive refractive power and is made of plastic material. Its object-side surface 551 near the optical axis 590 is convex, its image-side surface 552 near the optical axis 590 is concave, and the object-side surface 551 and image-side surface 552 Both are aspherical, and both the object-side surface 551 and the image-side surface 552 have at least one inflection point.

The infrared band-pass component 570 is made of glass, and it is disposed between the fifth lens 550 and the imaging surface 580 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 9 and Table 10 below.

In the fifth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 9 and Table 10, the following data can be deduced:

Sixth embodiment

As shown in Figure 6A and Figure 6B, Figure 6A shows a schematic diagram of a five-piece infrared single-focus lens group according to the sixth embodiment of the present invention, and Figure 6B shows the five-piece infrared lens group of the sixth embodiment from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 6A that the five-piece infrared single-focus lens group includes an aperture 600 and an optical group, and the optical group includes a first lens 610, a second lens 620, a third lens 630, and a first lens from the object side to the image side in sequence. The four lenses 640, the fifth lens 650, the infrared bandpass component 670, and the imaging surface 680, wherein there are five lenses with refractive power in the five-piece infrared single-focus lens group. The aperture 600 is disposed between the subject and the first lens 610 .

The first lens 610 has positive refractive power and is made of plastic material. Its object-side surface 611 near the optical axis 690 is convex, its image-side surface 612 near the optical axis 690 is concave, and the object-side surface 611 and the image-side surface 612 All are aspherical.

The second lens 620 has negative refractive power and is made of plastic material. Its object-side surface 621 near the optical axis 690 is concave, its image-side surface 622 near the optical axis 690 is convex, and the object-side surface 621 and the image-side surface 622 All are aspherical.

The third lens 630 has a positive refractive power and is made of plastic material. Its object-side surface 631 near the optical axis 690 is convex, its image-side surface 632 near the optical axis 690 is concave, and the object-side surface 631 and the image-side surface 632 All are aspherical.

The fourth lens 640 has a negative refractive power and is made of plastic material. Its object-side surface 641 near the optical axis 690 is concave, its image-side surface 642 near the optical axis 690 is convex, and the object-side surface 641 and the image-side surface 642 All are aspherical.

The fifth lens 650 has positive refractive power and is made of plastic material. Its object-side surface 651 near the optical axis 690 is convex, its image-side surface 652 near the optical axis 690 is concave, and the object-side surface 651 and the image-side surface 652 Both are aspherical, and both the object-side surface 651 and the image-side surface 652 have at least one inflection point.

The infrared band-pass component 670 is made of glass, and it is disposed between the fifth lens 650 and the imaging surface 680 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 11 and Table 12 below.

In the sixth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 11 and Table 12, the following data can be deduced:

Seventh embodiment

As shown in Figure 7A and Figure 7B, Figure 7A shows a schematic diagram of a five-piece infrared single-focus lens group according to the seventh embodiment of the present invention, and Figure 7B shows the five-piece infrared lens group of the seventh embodiment from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 7A that the five-piece infrared single-focus lens group includes an aperture 700 and an optical group, and the optical group includes a first lens 710, a second lens 720, a third lens 730, and a first lens 730 from the object side to the image side. Four lenses 740, a fifth lens 750, an infrared band-pass component 770, and an imaging surface 780, wherein the five-element infrared single-focus lens group has five lenses with refractive power. The aperture 700 is disposed between the subject and the first lens 710 .

The first lens 710 has positive refractive power and is made of plastic material. Its object-side surface 711 near the optical axis 790 is convex, its image-side surface 712 near the optical axis 790 is concave, and the object-side surface 711 and the image-side surface 712 All are aspherical.

The second lens 720 has negative refractive power and is made of plastic material. Its object-side surface 721 near the optical axis 790 is concave, its image-side surface 722 near the optical axis 790 is convex, and the object-side surface 721 and the image-side surface 722 All are aspherical.

The third lens 730 has positive refractive power and is made of plastic material. Its object-side surface 731 is convex near the optical axis 790, and its image-side surface 732 is concave near the optical axis 790. The object-side surface 731 and the image-side surface 732 All are aspherical.

The fourth lens 740 has a negative refractive power and is made of plastic material. Its object-side surface 741 near the optical axis 790 is concave, its image-side surface 742 near the optical axis 790 is convex, and the object-side surface 741 and the image-side surface 742 All are aspherical.

The fifth lens 750 has positive refractive power and is made of plastic material. Its object-side surface 751 near the optical axis 790 is convex, its image-side surface 752 near the optical axis 790 is concave, and the object-side surface 751 and the image-side surface 752 Both are aspherical, and both the object-side surface 751 and the image-side surface 752 have at least one inflection point.

The infrared bandpass component 770 is made of glass, and it is disposed between the fifth lens 750 and the imaging surface 780 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to the following Table 13 and Table 14.

In the seventh embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 13 and Table 14, the following data can be deduced:

Eighth embodiment

As shown in Fig. 8A and Fig. 8B, Fig. 8A shows a schematic diagram of a five-piece infrared single-focus lens group according to the eighth embodiment of the present invention, and Fig. 8B shows the five-piece infrared single-focus lens group of the eighth embodiment from left to right. Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 8A that the five-piece infrared single-focus lens group includes an aperture 800 and an optical group. The optical group includes a first lens 810, a second lens 820, a third lens 830, and a first lens 810 from the object side to the image side. Four lenses 840, fifth lens 850, infrared band-pass component 870, and imaging surface 880, wherein the number of lenses with refractive power in the five-piece infrared single-focus lens group is five. The aperture 800 is disposed between the subject and the first lens 810 .

The first lens 810 has positive refractive power and is made of plastic material. Its object-side surface 811 near the optical axis 890 is convex, its image-side surface 812 near the optical axis 890 is concave, and the object-side surface 811 and the image-side surface 812 All are aspherical.

The second lens 820 has negative refractive power and is made of plastic material. Its object-side surface 821 near the optical axis 890 is concave, its image-side surface 822 near the optical axis 890 is convex, and the object-side surface 821 and the image-side surface 822 All are aspherical.

The third lens 830 has positive refractive power and is made of plastic material. Its object-side surface 831 is convex near the optical axis 890, and its image-side surface 832 is convex near the optical axis 890. The object-side surface 831 and the image-side surface 832 All are aspherical.

The fourth lens 840 has negative refractive power and is made of plastic material. Its object-side surface 841 near the optical axis 890 is concave, its image-side surface 842 near the optical axis 890 is convex, and the object-side surface 841 and the image-side surface 842 All are aspherical.

The fifth lens 850 has positive refractive power and is made of plastic material. Its object-side surface 851 near the optical axis 890 is convex, its image-side surface 852 near the optical axis 890 is concave, and the object-side surface 851 and the image-side surface 852 Both are aspherical, and both the object-side surface 851 and the image-side surface 852 have at least one inflection point.

The infrared band-pass component 870 is made of glass, and is disposed between the fifth lens 850 and the imaging surface 880 without affecting the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 15 and Table 16 below.

In the eighth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 15 and Table 16, the following data can be deduced:

Ninth embodiment

As shown in Fig. 9A and Fig. 9B, Fig. 9A shows a schematic diagram of a five-piece infrared single-focus lens group according to the ninth embodiment of the present invention, and Fig. 9B shows the five-piece infrared lens group of the ninth embodiment from left to right Image plane curvature and distortion aberration curve of infrared single focus lens group. It can be seen from FIG. 9A that the five-piece infrared single-focus lens group includes an aperture 900 and an optical group, and the optical group includes a first lens 910, a second lens 920, a third lens 930, and a first lens 930 from the object side to the image side. The four lenses 940, the fifth lens 950, the infrared band-pass component 970, and the imaging surface 980, wherein there are five lenses with refractive power in the five-piece infrared single-focus lens group. The aperture 900 is disposed between the subject and the first lens 910 .

The first lens 910 has positive refractive power and is made of plastic material. Its object-side surface 911 near the optical axis 990 is convex, its image-side surface 912 near the optical axis 990 is concave, and the object-side surface 911 and image-side surface 912 All are aspherical.

The second lens 920 has positive refractive power and is made of plastic material. Its object-side surface 921 near the optical axis 990 is concave, its image-side surface 922 near the optical axis 990 is convex, and the object-side surface 921 and image-side surface 922 All are aspherical.

The third lens 930 has positive refractive power and is made of plastic material. Its object-side surface 931 near the optical axis 990 is concave, its image-side surface 932 near the optical axis 990 is convex, and the object-side surface 931 and image-side surface 932 All are aspherical.

The fourth lens 940 has negative refractive power and is made of plastic material. Its object-side surface 941 near the optical axis 990 is concave, its image-side surface 942 near the optical axis 990 is convex, and the object-side surface 941 and the image-side surface 942 All are aspherical.

The fifth lens 950 has positive refractive power and is made of plastic material. Its object-side surface 951 near the optical axis 990 is convex, its image-side surface 952 near the optical axis 990 is concave, and the object-side surface 951 and image-side surface 952 Both are aspherical, and both the object-side surface 951 and the image-side surface 952 have at least one inflection point.

The infrared band-pass component 970 is made of glass, and it is disposed between the fifth lens 950 and the imaging surface 980 and does not affect the focal length of the five-piece infrared single-focus lens group.

Then refer to Table 17 and Table 18 below.

In the ninth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 17 and Table 18, the following data can be deduced:

In the five-piece infrared single-focus lens group provided by the present invention, the material of the lens can be plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. In addition, when the lens is made of glass, the five-piece infrared single focus lens group can be increased. The degree of freedom of the configuration of the refractive power of the focus lens group. In addition, the object-side surface and the image-side surface of the lens in the five-piece infrared single-focus lens group can be aspherical, and the aspheric surface can be easily made into a shape other than a spherical surface, and more control variables can be obtained to reduce aberrations. The number of lenses used can be reduced, so the total length of the five-piece infrared single-focus lens group of the present invention can be effectively reduced.

In the five-piece infrared single-focus lens group provided by the present invention, as far as the lens with refractive power is concerned, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is at the near optical axis. Convex; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at the near optical axis.

The five-piece infrared single-focus lens group provided by the present invention can be applied to the optical system of moving focus according to the needs, and has the characteristics of excellent aberration correction and good imaging quality, and can be applied to 3D (three-dimensional) image capture in many ways. Electronic imaging systems such as cameras, digital cameras, mobile devices, digital graphics tablets, or car photography.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, Improvements and the like should all be included within the protection scope of the present invention.

Claims (15)

1. A five-piece infrared single-focus lens group is characterized in that it comprises an aperture and an optical group made up of five lenses, from the object side to the image side in order: said aperture; The first lens has a positive refractive power, the object-side surface of the first lens is convex near the optical axis, and at least one of the object-side surface and the image-side surface of the first lens is aspherical; The second lens has a refractive power, the object side surface of the second lens is concave near the optical axis, the image side surface of the second lens is convex near the optical axis, and the object side surface of the second lens is in contact with the optical axis. At least one surface on the image side is aspherical; The third lens has a positive refractive power, and at least one of the object-side surface and the image-side surface of the third lens is aspherical; The fourth lens has refractive power, the object side surface of the fourth lens is concave at the near optical axis, the image side surface of the fourth lens is convex at the near optical axis, and the object side surface of the fourth lens is in contact with the at least one of the image side surfaces is aspherical; and The fifth lens has positive refractive power, the object side surface of the fifth lens is convex near the optical axis, the image side surface of the fifth lens is concave near the optical axis, and the object side surface of the fifth lens is At least one of the surface and the image-side surface is an aspheric surface, and at least one of the object-side surface and the image-side surface of the fifth lens has at least one inflection point; Wherein the focal length of the first lens is f1, the focal length of the third lens is f3, the thickness of the first lens on the optical axis is CT1, and the thickness of the third lens on the optical axis is CT3, so The radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the object-side surface of the third lens is R5, the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, and the Half of the imaging height that can be captured by the five-piece infrared single-focus lens group on the imaging surface is IMH, and the following conditions are met: -1.60<(f1×CT1×R1)/(f3×CT3×R5)<2.43 and 1.78≦TL/IMH<2.6. 2. The five-piece infrared single-focus lens group according to claim 1, wherein the overall focal length of the five-piece infrared single-focus lens group is f, and the focal length of the first lens is f1, and satisfies The following conditions: 0.9<f1/f<2.2. 3. The five-piece infrared single-focus lens group according to claim 1, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following conditions are met: 0.74<f3 /f1<4.30. 4. five-chip infrared single-focus lens group according to claim 1, is characterized in that, the composite focal length of described first lens and second lens is f12, and the focal length of described 3rd lens is f3, and satisfy following Condition: 0.28<f12/f3<3.07. 5. The five-piece infrared single-focus lens group according to claim 1, wherein the composite focal length of the first lens and the second lens is f12, and the first lens, the second lens, and the third lens The combined focal length with the fourth lens is f1234, and the following conditions are satisfied: 0.70<f12/f1234<3.91. 6. The five-piece infrared single-focus lens group according to claim 1, wherein the overall focal length of the five-piece infrared single-focus lens group is f, and the first lens, the second lens and the third The composite focal length of the lens is f123 and satisfies the following conditions: 0.36<f/f123<1.33. 7. The five-piece infrared single-focus lens group according to claim 1, wherein the focal length of the first lens is f1, and the radius of curvature of the object-side surface of the first lens is R1, and satisfies the following conditions : 0.98<f1/R1<2.97. 8. The five-piece infrared single-focus lens group according to claim 1, wherein the radius of curvature of the image side surface of the second lens is R4, and the radius of curvature of the object side surface of the second lens is R3, And meet the following conditions: 0.71<R4/R3<2.75. 9. The five-piece infrared single-focus lens group according to claim 1, wherein the radius of curvature of the fourth lens object side surface is R7, and the radius of curvature of the fourth lens image side surface is R8, And meet the following conditions: 0.38<R7/R8<7.81. 10. The five-piece infrared single-focus lens group according to claim 1, wherein the radius of curvature of the object-side surface of the fifth lens is R9, and the radius of curvature of the image-side surface of the fifth lens is R10, And meet the following conditions: 0.66<R9/R10<1.75. 11. The five-piece infrared single-focus lens group according to claim 1, wherein the focal length of the third lens is f3, and the radius of curvature of the object-side surface of the third lens is R5, and satisfies the following conditions : -15.0<f3/R5<4.9. 12. The five-piece infrared single-focus lens group according to claim 1, wherein the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the distance between the second lens and the optical axis is TL. The thickness on the axis is CT2, the thickness of the third lens on the optical axis is CT3, and the thickness of the fourth lens on the optical axis is CT4, and the following conditions are satisfied: 2.5<TL/(CT2+CT3+CT4 )<8.1. 13. The five-piece infrared single-focus lens group according to claim 1, wherein the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the five-piece infrared single focus The overall focal length of the focus lens group is f, and the following conditions are met: 1.06<TL/f<2.07. 14. The five-piece infrared single-focus lens group according to claim 1, wherein the distance from the image-side surface of the fifth lens to the imaging plane on the optical axis is BFL, and the object of the first lens is The distance on the optical axis from the side surface to the imaging plane is TL, and the following conditions are met: 0.15<BFL/TL<0.39. 15. The five-piece infrared single-focus lens group according to claim 1, wherein the focal length of the first lens is f2, the thickness of the second lens on the optical axis is CT2, and the second lens has a thickness of f2. The radius of curvature of the object-side surface of the lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following conditions are satisfied: -1.72<f2×CT2/(R3×R4)<0.48.

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