TW201917441A - Three-piece infrared single wavelength projection lens system - Google Patents

Three-piece infrared single wavelength projection lens system Download PDF

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Publication number
TW201917441A
TW201917441A TW106136444A TW106136444A TW201917441A TW 201917441 A TW201917441 A TW 201917441A TW 106136444 A TW106136444 A TW 106136444A TW 106136444 A TW106136444 A TW 106136444A TW 201917441 A TW201917441 A TW 201917441A
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Taiwan
Prior art keywords
lens
wavelength projection
imaging
optical axis
projection lens
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TW106136444A
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Chinese (zh)
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TWI631367B (en
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蔡斐欣
黃靖昀
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新鉅科技股份有限公司
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Priority to TW106136444A priority Critical patent/TWI631367B/en
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Publication of TWI631367B publication Critical patent/TWI631367B/en
Publication of TW201917441A publication Critical patent/TW201917441A/en

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Abstract

A three-piece infrared single wavelength projection lens system includes, in order from an image side to an image source side: a first lens element with a positive refractive power; a second lens element with a negative refractive power; a third lens element with a positive refractive power; a stop disposed before an image source-side surface of the first lens element or between an image-side surface of the first lens element and an image source-side surface of the second lens element. Such arrangements can provide a three-piece infrared single wavelength projection lens system with better image sensing function.

Description

Three-piece infrared single-wavelength projection lens set
The present invention relates to a projection lens set, and more particularly to a miniaturized three-piece infrared single-wavelength projection lens set for use on an electronic product.
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.
It is an object of the present invention to provide a three-piece infrared single-wavelength projection lens set, and more particularly to a three-piece infrared single-wavelength projection lens set having a better image sensing function.
In order to achieve the foregoing objective, a three-piece infrared single-wavelength projection lens set according to the present invention comprises, in order from the imaging side to the image source side, a first lens having a positive refractive power and an imaging side surface thereof. The near optical axis is convex, and at least one surface of the imaging side surface and the image source side surface is aspherical; a second lens has a negative refractive power, and the image side surface is concave at the near optical axis, and the imaging side surface thereof is At least one surface of the source side surface is aspherical. A third lens has a positive refractive power, and the imaging side surface has a concave surface at a near optical axis, and the image side surface is convex at a near optical axis, and at least one surface of the imaging side surface and the image source side surface is aspherical. An aperture is disposed between the image source side surface of the first lens or between the image side surface of the first lens and the image source side surface of the second lens.
Preferably, wherein the three-piece infrared single-wavelength projection lens group has an overall focal length of f, the first lens and the second lens have a combined focal length of f12, and satisfy the following condition: 0.6 < f/f12 < 1.6. Thereby, the proper arrangement of the refractive power of the first lens and the second lens effectively combines the characteristics of large viewing angle and miniaturization.
Preferably, wherein the three-piece infrared single-wavelength projection lens group has an overall focal length of f, the second lens and the third lens have a combined focal length of f23, and satisfy the following condition: 0.1 < f/f23 < 1.3. Thereby, the three-chip infrared single-wavelength projection lens set can achieve a balance between shortening the total optical length and correcting the aberration.
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: -3.0 < f1/f2 < -1.7. 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 focal length of the second lens is f2, the focal length of the third lens is f3, and the following condition is satisfied: -0.55 < f2/f3 < -0.15. Thereby, the arrangement of the refractive power of the second lens and the third lens is balanced, which contributes to the correction of the aberration and the reduction of the sensitivity.
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: 0.5 < f1/f3 < 1.3. Thereby, the positive refractive power of the first lens is effectively distributed, and the sensitivity of the three-piece infrared single-wavelength projection lens group is reduced.
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: 0.02 < f1/f23 < 0.46. Thereby, the resolution capability of the three-piece infrared single-wavelength projection lens group is significantly improved.
Preferably, wherein the first lens and the second lens have a combined focal length of f12, the third lens has a focal length of f3, and satisfies the following condition: 1.34 < f12/f3 < 4.05. Thereby, the resolution capability of the three-piece infrared single-wavelength projection lens group is significantly improved.
Preferably, wherein the imaging side surface of the first lens has a radius of curvature R1, the image source side surface of the first lens has a radius of curvature of R2, and satisfies the following condition: -3.38 < R1/R2 < 0.45. Thereby, the spherical aberration and astigmatism of the three-piece infrared single-wavelength projection lens group are effectively reduced.
Preferably, wherein the imaging side surface has a radius of curvature R3, the image side surface curvature radius of the second lens is R4, and the following condition is satisfied: -1.87 < R3/R4 < 6.23. Thereby, the spherical aberration and astigmatism of the three-piece infrared single-wavelength projection lens group are effectively reduced.
Preferably, wherein the imaging lens has a radius of curvature R5 of the third lens, and the image source side surface of the third lens has a radius of curvature of R6 and satisfies the following condition: 0.5 < R5/R6 < 3.2. Thereby, the spherical aberration and astigmatism of the three-piece infrared single-wavelength projection lens group are effectively reduced.
Preferably, the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, and the following condition is satisfied: 0.8 < CT1/CT2 < 3.5. Thereby, the moldability and homogeneity of the lens can be facilitated.
Preferably, the thickness of the second lens on the optical axis is CT2, and the thickness of the third lens on the optical axis is CT3, and the following condition is satisfied: 0.1 < CT2/CT3 < 1.6. This allows for an appropriate balance between image quality and sensitivity.
Preferably, 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, and the following condition is satisfied: 0.1 < CT1/CT3 < 1.1. Thereby, the moldability and homogeneity of the lens can be facilitated.
Preferably, wherein the overall focal length of the three-piece infrared single-wavelength projection lens group is f, the distance from the imaging side surface of the first lens to the image source surface on the optical axis is TL, and the following condition is satisfied: 1.0 < f /TL < 2.0. Thereby, it is advantageous to maintain the miniaturization of the three-chip infrared single-wavelength projection lens group to be mounted on a thin and light electronic product.
Preferably, 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, and satisfies the following conditions: n1, n2, and n3>1.6. Thereby, lens matching and blending of the overall three-piece infrared single-wavelength projection lens group is facilitated to provide better aberration balance.
With regard to the techniques, means, and other effects of the present invention in light of the above-described objects, the preferred embodiments are described in detail with reference to the drawings.
<First Embodiment>
1A and FIG. 1B, FIG. 1A is a schematic diagram of a three-chip infrared single-wavelength projection lens set according to a first embodiment of the present invention, and FIG. 1B is a three-piece type of the first embodiment from left to right. Infrared single-wavelength projection lens group non-point difference, distortion curve. As shown in FIG. 1A, the three-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 lens from the imaging side to the image source side. 130. The image source surface 180, wherein the lens of the three-piece infrared single-wavelength projection lens group has a refractive power of three. The aperture 100 is disposed between the imaging side surface 111 of the first lens 110 and the imaging side surface 122 of the second lens 120.
The first lens 110 has a positive refractive power and is made of a plastic material. The imaging 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 side surface 111 and the image are The source side surfaces 112 are all aspherical.
The second lens 120 has a negative refractive power and is made of a plastic material. The imaging 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 side surface 121 and the image are The source side surfaces 122 are all aspherical.
The third lens 130 has a positive refractive power and is made of a plastic material, and the imaging side surface 131 is concave at the near optical axis 190, and the image side surface 132 is convex at the near optical axis 190, and the imaging side surface 131 and the image are The source side surfaces 132 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, G, ... are High order aspheric coefficient.
In the three-piece infrared single-wavelength projection lens group of the first embodiment, the focal length of the three-piece infrared single-wavelength projection lens group is f, and the aperture value (f-number) of the three-piece infrared single-wavelength projection lens group is Fno. The maximum field of view (angle of view) in the three-piece infrared single-wavelength projection lens set is FOV, and its values are as follows: f = 5.97 (millimeters); Fno = 2.6; and FOV = 4.89 (degrees).
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the overall focal length of the three-piece infrared single-wavelength projection lens group is f, and the combined focal length of the first lens 110 and the second lens 120 is f12, and satisfies The following conditions are: f/f12 = 1.429.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the overall focal length of the three-piece infrared single-wavelength projection lens group is f, and the combined focal length of the second lens 120 and the third lens 130 is f23, and satisfies The following conditions are: f/f23 = 0.512.
In the three-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 = -2.088.
In the three-piece infrared single-wavelength projection lens group 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 = -0.383.
In the three-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 = 0.8.
In the three-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 and the third lens 130 is f23, and the following conditions are satisfied: f1/f23 = 0.175.
In the three-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 focal length of the third lens 130 is f3, and the following conditions are satisfied: f12/f3 = 1.637.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the imaging 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 Condition: R1/R2 = -3.076.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the imaging 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 Condition: R3/R4 = 3.559.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the imaging 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 Condition: R5/R6 = 0.75.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the thickness of the first lens 110 on the optical axis 190 is CT1, and the thickness of the second lens 120 on the optical axis 190 is CT2, and the following conditions are met. : CT1/CT2 = 1.004.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the thickness of the second lens 120 on the optical axis 190 is CT2, and the thickness of the third lens 130 on the optical axis 190 is CT3, and the following conditions are met. : CT2/CT3 = 1.354.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the thickness of the first lens 110 on the optical axis 190 is CT1, and the thickness of the third lens 130 on the optical axis 190 is CT3, and the following conditions are met. : CT1/CT3 = 1.360.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the overall focal length of the three-piece infrared single-wavelength projection lens group is f, and the imaging side surface 111 to the image source surface 180 of the first lens 110 are on the optical axis. The distance on 190 is TL and the following conditions are met: f/TL = 1.637.
In the three-piece infrared single-wavelength projection lens set of the first embodiment, the refractive index of the first lens 110 is n1, the refractive index of the second lens 120 is n2, and the refractive index of the third lens 130 is n3, and The following conditions are met: n1, n2, n3 = 1.65.
Refer to Table 1 and Table 2 below for reference.
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 0-9 sequentially represent the surface from the imaging side to the image source side. Table 2 is the aspherical data in the first embodiment, wherein the cone coefficients in the a-spherical curve equation of k, A, B, C, D, E, F, ... are high-order aspheric 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 three-chip infrared single-wavelength projection lens group according to a second embodiment of the present invention, and FIG. 2B is a three-piece embodiment of the second embodiment from left to right. Infrared single-wavelength projection lens group non-point difference, distortion curve. As can be seen from FIG. 2A, the three-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 lens from the imaging side to the image source side. 230, and an image source surface 280, wherein the lens of the three-piece infrared single-wavelength projection lens group has a refractive power of three. The aperture 200 is disposed between the image source side surface 212 of the first lens 210 and the imaging side surface 221 of the second lens 220.
The first lens 210 has a positive refractive power and is made of a plastic material. The imaging 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 side surface 211 and the image are The source side surfaces 212 are all aspherical.
The second lens 220 has a negative refractive power and is made of a plastic material. The imaging side surface 221 is convex at the near optical axis 290, and the image side surface 222 is concave at the near optical axis 290, and the imaging side surface 221 and the image are The source side surfaces 222 are all aspherical.
The third lens 230 has a positive refractive power and is made of a plastic material. The imaging side surface 231 is concave at the near optical axis 290, and the image side surface 232 is convex at the near optical axis 290, and the imaging side surface 231 and the image are The source side surfaces 232 are all aspherical.
Refer to Table 3 and Table 4 below.
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:
<Third embodiment>
Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of a three-chip infrared single-wavelength projection lens set according to a third embodiment of the present invention, and FIG. 3B is a three-piece third embodiment from left to right. Infrared single-wavelength projection lens group non-point difference, distortion curve. As can be seen from FIG. 3A, the three-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 lens from the imaging side to the image source side. 330, and an image source surface 380, wherein the lens having a refractive power in the three-piece infrared single-wavelength projection lens group is two. The aperture 300 is disposed between the imaging side surface 311 of the first lens 310 and the image source side surface 312.
The first lens 310 has a positive refractive power and is made of a plastic material. The imaging 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 side surface 311 and the image are The source side surfaces 312 are all aspherical.
The second lens 320 has a negative refractive power and is made of a plastic material. The imaging side surface 321 is concave at the near optical axis 390, and the image side surface 322 is concave at the near optical axis 390, and the imaging side surface 321 and the image are The source side surfaces 322 are all aspherical.
The third lens 330 has a positive refractive power and is made of a plastic material. The imaging side surface 331 is concave at the near optical axis 390, and the image side surface 332 is convex at the near optical axis 390, and the imaging side surface 331 and the image are The source side surfaces 332 are all aspherical.
Refer to Table 5 and Table 6 below for reference.
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:
<Fourth embodiment>
Please refer to FIG. 4A and FIG. 4B , wherein FIG. 4A is a schematic diagram of a three-chip infrared single-wavelength projection lens set according to a fourth embodiment of the present invention, and FIG. 4B is a three-piece form of the fourth embodiment from left to right. Infrared single-wavelength projection lens group non-point difference, distortion curve. As can be seen from FIG. 4A, the three-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 lens from the imaging side to the image source side. 430, and an image source surface 480, wherein the lens of the three-piece infrared single-wavelength projection lens group has a refractive power of three. The aperture 400 is disposed between the imaging side surface 411 of the first lens 410 and the image source side surface 412.
The first lens 410 has a positive refractive power and is made of a plastic material. The imaging side surface 411 is convex at the near optical axis 490, and the image side surface 412 is concave at the near optical axis 490, and the imaging side surface 411 and the image are The source side surfaces 412 are all aspherical.
The second lens 420 has a negative refractive power and is made of a plastic material. The imaging side surface 421 is concave at the near optical axis 490, and the image side surface 422 is concave at the near optical axis 490, and the imaging side surface 421 and the image are The source side surfaces 422 are all aspherical.
The third lens 430 has a positive refractive power and is made of a plastic material. The imaging side surface 431 is concave at the near optical axis 490, and the image side surface 432 is convex at the near optical axis 490, and the imaging side surface 431 and the image are The source side surfaces 432 are all aspherical.
Refer to Table 7 and Table 8 below for reference.
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:
<Fifth Embodiment>
5A and 5B, wherein FIG. 5A is a schematic diagram of a three-chip infrared single-wavelength projection lens group according to a fifth embodiment of the present invention, and FIG. 5B is a three-piece fifth embodiment from left to right. Infrared single-wavelength projection lens group non-point difference, distortion curve. As can be seen from FIG. 5A, the three-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 lens from the imaging side to the image source side. 530, and an image source surface 580, wherein the lens of the three-piece infrared single-wavelength projection lens group has a refractive power of three. The aperture 500 is disposed between the imaging side surface 511 of the first lens 510 and the image source side surface 512.
The first lens 510 has a positive refractive power and is made of a plastic material. The imaging side surface 511 is convex at the near optical axis 590, and the source side surface 512 is concave at the near optical axis 590, and the imaging side surface 511 and the image are The source side surfaces 512 are all aspherical.
The second lens 520 has a negative refractive power and is made of a plastic material. The imaging side surface 521 is concave at the near optical axis 590, and the image side surface 522 is concave at the near optical axis 590, and the imaging side surface 521 and the image are The source side surfaces 522 are all aspherical.
The third lens 530 has a positive refractive power and is made of a plastic material, and the imaging side surface 531 is concave at the near optical axis 590, and the image side surface 532 is convex at the near optical axis 590, and the imaging side surface 531 and the image are The source side surfaces 532 are all aspherical.
Refer to Table 9 and Table 10 below.
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:
The three-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, three-piece infrared can be added. The degree of freedom in the configuration of the refractive power of a single-wavelength projection lens set. In addition, the imaging side surface and the image source side surface of the lens in the three-piece 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 aberration. In turn, the number of lenses used is reduced, so that the total length of the three-piece infrared single-wavelength projection lens set of the present invention can be effectively reduced.
In the three-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 beam 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.
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‧ ‧ aperture
110, 210, 310, 410, 510‧‧‧ first lens
111, 211, 311, 411, 511 ‧ ‧ imaging side surface
112, 212, 312, 412, 512‧‧‧ source side surface
120, 220, 320, 420, 520‧‧‧ second lens
121, 221, 321, 421, 521 ‧ ‧ imaging side surface
122, 222, 322, 422, 522‧‧‧ source side surface
130, 230, 330, 430, 530‧‧‧ third lens
131, 231, 331, 431, 531‧‧ ‧ imaging side surface
132, 232, 332, 432, 532‧‧‧ source side surface
180, 280, 380, 480, 580‧‧‧ source side
190, 290, 390, 490, 590‧‧ ‧ optical axis
f‧‧‧Focus of three-piece infrared single-wavelength projection lens set
Aperture value of Fno‧‧‧ three-chip infrared single-wavelength projection lens set
Maximum field of view in a FOV‧‧‧ three-chip 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
F12‧‧‧Combined focal length of the first lens and the second lens
F23‧‧‧Combined focal length of the second lens and the third lens
Radius of curvature of the image side surface of the first lens of R1‧‧‧
R2‧‧‧ Image source side surface radius of curvature of the first lens
The radius of curvature of the image side surface of the R3‧‧‧ second lens
R4‧‧‧ Image source side surface radius of curvature of the second lens
R5‧‧‧ imaging lens surface curvature radius of the third lens
R6‧‧‧ Image source side surface radius of curvature of the third lens
CT1‧‧‧ thickness of the first lens on the optical axis
CT2‧‧‧ thickness of the second lens on the optical axis
CT3‧‧‧ thickness of the third lens on the optical axis
TL‧‧‧Distance of the imaging side surface of the first lens to the image source surface on the optical axis
1A is a schematic view of a three-piece infrared single-wavelength projection lens set according to a first embodiment of the present invention. FIG. 1B is a non-dot-collecting and distortion-receiving graph of the three-piece infrared single-wavelength projection lens group of the first embodiment, from left to right. 2A is a schematic view of a three-piece infrared single-wavelength projection lens set according to a second embodiment of the present invention. 2B is a non-dot-collecting and distortion-receiving graph of the three-piece infrared single-wavelength projection lens group of the second embodiment, from left to right. 3A is a schematic view of a three-piece infrared single-wavelength projection lens set according to a third embodiment of the present invention. FIG. 3B is a non-dot-collecting and distortion-receiving graph of the three-piece infrared single-wavelength projection lens group of the third embodiment, from left to right. 4A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a fourth embodiment of the present invention. 4B is a non-dot-collecting and distortion-receiving graph of the three-piece infrared single-wavelength projection lens group of the fourth embodiment, from left to right. Figure 5A is a schematic illustration of a three-piece infrared single wavelength projection lens assembly in accordance with a fifth embodiment of the present invention. FIG. 5B is a non-dot-collecting and distortion-receiving graph of the three-piece infrared single-wavelength projection lens group of the fourth embodiment, from left to right.

Claims (16)

  1. A three-piece infrared single-wavelength projection lens set comprises, from the imaging side to the image source side, sequentially: a first lens having a positive refractive power, a convex side of the imaging side surface near the optical axis, and an imaging side surface and an image source thereof At least one surface of the side surface is aspherical; a second lens having a negative refractive power, the image side surface having a concave surface at a near optical axis, and at least one surface of the image side surface and the image source side surface being aspherical; The lens has a positive refractive power, and the imaging side surface is a concave surface at a near optical axis, and the image side surface is convex at a near optical axis, and at least one surface of the imaging side surface and the image source side surface is aspherical; an aperture is set Between the image source side surface of the first lens or the image side surface of the first lens and the image source side surface of the second lens.
  2. The three-chip infrared single-wavelength projection lens set according to claim 1, wherein the overall focal length of the three-piece infrared single-wavelength projection lens group is f, and the combined focal length of the first lens and the second lens is f12, and satisfies The following conditions are: 0.6 < f/f12 < 1.6.
  3. The three-chip infrared single-wavelength projection lens set according to claim 1, wherein the overall focal length of the three-piece infrared single-wavelength projection lens group is f, and the combined focal length of the second lens and the third lens is f23, and satisfies The following conditions are: 0.1 < f/f23 < 1.3.
  4. The three-piece infrared single-wavelength projection lens set according to claim 1, 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: -3.0 < f1/f2 < -1.7 .
  5. The three-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: -0.55 < f2/f3 < -0.15 .
  6. The three-piece 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: 0.5 < f1/f3 < 1.3.
  7. The three-piece infrared single-wavelength projection lens set according to claim 1, 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: 0.02 < f1/ F23 < 0.46.
  8. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein the first lens and the second lens have a combined focal length of f12, the third lens has a focal length of f3, and satisfies the following condition: 1.34 < f12/ F3 < 4.05.
  9. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein an imaging side surface of the first lens has a radius of curvature R1, and an image source side surface of the first lens has a radius of curvature of R2, and satisfies the following conditions: -3.38 < R1/R2 < 0.45.
  10. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein the imaging lens has a radius of curvature R3 of the second lens, and the image source side surface of the second lens has a radius of curvature of R4, and satisfies the following conditions: -1.87 < R3/R4 < 6.23.
  11. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein an imaging side surface of the third lens has a radius of curvature R5, and an image source side surface of the third lens has a radius of curvature of R6, and satisfies the following conditions: 0.5 < R5/R6 < 3.2.
  12. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein the thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, and the following condition is satisfied: 0.8 < CT1/CT2 < 3.5.
  13. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, and the following condition is satisfied: 0.1 < CT2/CT3 < 1.6.
  14. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein the thickness of the first lens on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, and the following condition is satisfied: 0.1 < CT1/CT3 < 1.1.
  15. The three-piece infrared single-wavelength projection lens set according to claim 1, wherein the three-piece infrared single-wavelength projection lens group has an overall focal length of f, and the imaging side surface of the first lens is on the optical axis of the image source surface. The distance is TL and the following conditions are met: 1.0 < f/TL < 2.0.
  16. The three-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 and satisfies The following conditions: n1, n2, n3>1.6.
TW106136444A 2017-10-24 2017-10-24 Three-piece infrared single wavelength projection lens system TWI631367B (en)

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