Optical image capturing system

Abstract

An optical imaging system comprises a lens and an optical filter from an object side to an image side along an optical axis. The lens has refractive power, the optical filter is adjacent to the lens, the lens or / and the optical filter comprises at least one visible light absorption component, the lens or / and the optical filter correspondingly absorbs visible light with the wavelength interval ranging from 400 nm to 700 nm, and the lens or / and the optical filter correspondingly penetrates light with the wavelength interval larger than 800 nm; in another embodiment, the lenses are a plurality of lenses, at least one of the plurality of lenses is a filter lens, and the filter lens comprises the visible light absorption component, so that the optical imaging system has the characteristics of absorbing visible light and high-transmittance infrared light, thereby improving the light receiving efficiency of the system and improving the working quality.

Description

Technical Field

[0001] The present invention relates to an optical image capturing system; in particular, it relates to an optical imaging system with high infrared light transmittance and low visible light transmittance which can be applied to electronic products. Background Art

[0002] In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has been increasing. The photosensitive elements of general optical systems are either Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor). With the advancement of semiconductor process technology, the pixel size of photosensitive elements has been reduced, and optical systems have gradually developed towards high-pixel areas, so the requirements for imaging quality are also increasing.

[0003] However, in recent years, traditional optical lenses have been unable to meet the high optical quality requirements of diversified electronic products, especially lenses that specifically pass infrared light. It is known that current optical technology is to coat the surface of the lens with a coating material to enable the lens to have the ability to reflect and intercept visible light. However, under different light incident angle conditions, the reflection and interception effects of the coating material on the lens produce a sensitive offset phenomenon, so it is unable to meet the increasingly stringent optical quality market requirements.

[0004] Therefore, how to provide an improved optical imaging system with the characteristics of effectively absorbing visible light and having high transmittance infrared light to improve the light collection efficiency of the system and enhance the work quality is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides an optical imaging system that can effectively provide the performance of absorbing visible light and high-transmittance infrared light.

[0006] In order to achieve the above-mentioned purpose, an optical imaging system provided by a preferred embodiment of the present invention includes at least one lens and a filter along an optical axis from an object side to an image side. The lens has a refractive power, and at least one of the object side and the image side of the lens is an aspherical surface, wherein the lens contains at least one visible light absorbing component, and the lens corresponds to absorbing visible light with a wavelength range between 400nm and 700nm, and the lens corresponds to penetrating light with a wavelength range greater than 800nm; the filter is adjacent to the lens.

[0007] Another preferred embodiment of the present invention provides an optical imaging system, comprising at least one lens and a filter along an optical axis from an object side to an image side. The filter is adjacent to the lens, the filter comprises at least one visible light absorbing component, the filter absorbs visible light with a wavelength range of 400nm to 700nm, and the filter transmits light with a wavelength range greater than 800nm.

[0008] Another preferred embodiment of the present invention provides an optical imaging system, comprising a plurality of lenses along an optical axis from an object side to an image side, wherein the plurality of lenses respectively have refractive power, and at least one of the plurality of lenses is a filter lens, wherein the filter lens comprises at least one visible light absorbing component, and the filter lens corresponds to absorbing visible light in a wavelength range between 400nm and 700nm, and the filter lens corresponds to transmitting light in a wavelength range greater than 800nm.

[0009] The effect of the present invention is that at least one lens or more than one lens in the optical imaging system contains a visible light absorbing component, and the planar filter may also contain the visible light absorbing component, wherein the optical imaging system is capable of directly performing wavefront modulation and imaging on infrared rays, so that the optical imaging system has the characteristics of absorbing visible light and having high transmittance infrared light, and can be applied to various infrared optical systems, thereby improving the system's light collection efficiency and enhancing the work quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and other features of the present invention will be described in detail with reference to the accompanying drawings.

[0011] Figure 1 A schematic diagram of the lens arrangement of the optical imaging system according to the first embodiment of the present invention;

[0012] Figure 2 It is a schematic structural diagram of defining θ1 using a first lens in the optical imaging system of the first embodiment of the present invention;

[0013] Figure 3 Another schematic diagram of a structure in which the first lens is used to define θ1 in the optical imaging system of the first embodiment of the present invention;

[0014] Figure 4 It is a schematic structural diagram of defining θ2 using a first lens in an optical imaging system according to a first embodiment of the present invention;

[0015] Figure 5 Another schematic diagram of a structure in which the first lens is used to define θ2 in the optical imaging system of the first embodiment of the present invention;

[0016] Figure 6 It is a schematic structural diagram of defining θ3 using a first lens in the optical imaging system of the first embodiment of the present invention;

[0017] Figure 7 Another schematic diagram of the structure of the optical imaging system of the first embodiment of the present invention using the first lens to define θ3;

[0018] Figure 8 A transmittance curve diagram of the optical imaging system according to the first embodiment of the present invention when the wavelength range of the light from the first lens is greater than 800 nm and the incident angles are 0, 10, 20, 30, 40 and 50 degrees;

[0019] Fig. 9 From left to right, graphs showing longitudinal spherical aberration, astigmatism, and optical distortion of the optical imaging system according to the first embodiment of the present invention are shown;

[0020] Fig.10 is a diagram showing the infrared light spectrum modulation conversion characteristics of the optical imaging system according to the first embodiment of the present invention;

[0021] Fig.11 A schematic diagram of the lens arrangement of an optical imaging system according to a second embodiment of the present invention;

[0022] Fig.12 From left to right are graphs showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging system according to the second embodiment of the present invention;

[0023] Fig.13 is a diagram showing the infrared light spectrum modulation conversion characteristics of the optical imaging system according to the second embodiment of the present invention;

[0024] Fig.14 A schematic diagram of the lens arrangement of an optical imaging system according to a third embodiment of the present invention;

[0025] Fig.15 From left to right are graphs showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging system according to the third embodiment of the present invention;

[0026] Fig.16 is a graph showing the infrared light spectrum modulation conversion characteristics of the optical imaging system according to the third embodiment of the present invention;

[0027] Fig.17 A schematic diagram of the lens arrangement of an optical imaging system according to a fourth embodiment of the present invention;

[0028] Fig.18 From left to right are graphs showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fourth embodiment of the present invention;

[0029] Fig.19 is a graph showing the infrared light spectrum modulation conversion characteristics of the optical imaging system according to the fourth embodiment of the present invention;

[0030] Fig. 20 A schematic diagram of the lens arrangement of an optical imaging system according to a fifth embodiment of the present invention;

[0031] Fig.21 From left to right are graphs showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fifth embodiment of the present invention;

[0032] Fig. 22 is a graph showing the infrared light spectrum modulation conversion characteristics of the optical imaging system according to the fifth embodiment of the present invention;

[0033] Fig.23 A schematic diagram of the lens arrangement of an optical imaging system according to a sixth embodiment of the present invention;

[0034] Fig.24 From left to right are graphs showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging system according to the sixth embodiment of the present invention;

[0035] Fig.25 is a graph showing the infrared light spectrum modulation conversion characteristics of the optical imaging system according to the sixth embodiment of the present invention;

[0036] Fig.26 is a schematic diagram of lens arrangement of an optical imaging system according to a seventh embodiment of the present invention;

[0037] Fig. 27 From left to right are graphs showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging system according to the seventh embodiment of the present invention;

[0038] Fig.28 It is a diagram showing the infrared light spectrum modulation conversion characteristics of the optical imaging system of the seventh embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 100, 200, 300, 400, 500, 600, 700: Optical imaging system

[0041] 110, 110', 210, 310, 410, 510, 610, 710: First lens

[0042] 111, 111', 211, 311, 411, 511, 611, 711: side view

[0043] 112, 112', 212, 312, 412, 512, 612, 712: Like the side

[0044] 113, 113': Outer surface

[0045] 120, 220, 320, 420, 520, 620, 720: Second lens

[0046] 121, 221, 321, 421, 521, 621, 721: side view

[0047] 122, 222, 322, 422, 522, 622, 722: Like the side

[0048] 130, 230, 330, 430, 530, 630, 730: Third lens

[0049] 131, 231, 331, 431, 531, 631, 731: side view

[0050] 132, 232, 332, 432, 532, 632, 732: Like the side

[0051] 340, 440, 540, 640, 740: Fourth lens

[0052] 341, 441, 541, 641, 741: side view

[0053] 342, 442, 542, 642, 742: Like the side

[0054] 450, 550, 650, 750: Fifth lens

[0055] 451, 551, 651, 751: side view

[0056] 452, 552, 652, 752: Like the side view

[0057] 660, 760: The sixth lens

[0058] 661, 761: side view

[0059] 662, 762: Like the side

[0060] 770: Seventh lens

[0061] 771: Side view

[0062] 772: Like the side

[0063] 140, 350, 460, 560, 670, 780: Filters

[0064] 142, 352, 462, 562, 672, 782: Like the side

[0065] 150, 240, 360, 470, 570, 680, 790: Imaging surface

[0066] ST: Aperture

[0067] Z: Optical axis

[0068] A, A': intersection point

[0069] S1, S1', S2, S2', S3, S3': Baseline

[0070] N1, N1', N2, N2', N3, N3': normal vector

[0071] T, T': imaginary line

[0072] P: Horizontal profile surface

[0073] HOI: Maximum imaging height perpendicular to the optical axis on the imaging plane

[0074] HEP: Entrance pupil diameter of the optical imaging system

[0075] ERA70: The angle at which the principal ray emerges from the image side of the lens or the filter and corresponds to 0.70*HOI of the imaging surface

[0076] IRA100: The angle at which the lower ray is incident on the object side of the lens and corresponds to 1.0*HOI of the imaging surface DETAILED DESCRIPTION

[0077] In order to more clearly illustrate the present invention, preferred embodiments are given and described in detail with reference to the accompanying drawings. Figures 1 to 10 , is an optical imaging system 100 according to a first embodiment of the present invention, wherein Figure 1 FIG. 1 is a schematic diagram showing a lens arrangement of an optical imaging system 100 according to a first embodiment of the present invention. Fig. 9 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 100 of the first embodiment. Fig.10 It is a diagram showing the infrared light spectrum modulation conversion characteristics of the first embodiment.

[0078] Depend on Figure 1 It can be seen that the optical imaging system 100 of the first embodiment includes a first lens 110 , an aperture ST, a second lens 120 , a third lens 130 , a filter 140 and an imaging surface 150 along an optical axis Z from an object side to an image side.

[0079] The first lens 110 is a convex-concave lens with positive refractive power, which means that the object-side surface 111 of the first lens 110 is convex, and the image-side surface 112 of the first lens 110 is concave, wherein at least one of the object-side surface 111 and the image-side surface 112 of the first lens 110 is aspherical. In the first embodiment, both the object-side surface 111 and the image-side surface 112 of the first lens 110 are aspherical, and the first lens 110 is a filter lens made of plastic material. The first lens 110 includes at least one visible light absorbing component, and the visible light absorbing component can be an azo dye or a porphyrin dye. The first lens 110 can effectively change the absorption of a specific wavelength by adding the visible light absorbing component, so that the first lens 110 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the lens correspondingly transmits light in a wavelength range greater than 800nm, so as to maintain a high pass rate of infrared light.

[0080] The second lens 120 is a positive refracting power meniscus lens, which means that the object side surface 121 of the second lens 120 is a concave surface, and the image side surface 122 of the second lens 120 is a convex surface, wherein at least one of the object side surface 121 and the image side surface 122 of the second lens 120 is an aspherical surface. In the first embodiment, both the object side surface 121 and the image side surface 122 of the second lens 120 are aspherical surfaces, and the second lens 120 is a filter lens made of plastic material. The second lens 120 includes the visible light absorbing component, whereby the second lens 120 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the second lens 120 correspondingly transmits light in a wavelength range greater than 800nm.

[0081] The third lens 130 is a convex-concave lens with positive refractive power, which means that the object-side surface 131 of the third lens 130 is a convex surface, and the image-side surface 132 of the third lens 130 is a concave surface, wherein at least one of the object-side surface 131 and the image-side surface 132 of the third lens 130 is an aspherical surface. In the first embodiment, both the object-side surface 131 and the image-side surface 132 of the third lens 130 are aspherical surfaces, and the third lens 130 is a filter lens made of plastic material. The third lens 130 includes the visible light absorbing component, whereby the third lens 130 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the third lens 130 correspondingly transmits light in a wavelength range greater than 800nm.

[0082] In addition, the object-side surfaces 111, 121, 131 and the image-side surfaces 112, 122, 132 of the first lens 110, the second lens 120 and the third lens 130 are all aspherical surfaces, which can obtain more control variables. In addition to reducing aberrations, the number of lenses used can even be reduced compared to the use of traditional glass lenses, thereby effectively reducing the overall height of the optical imaging system 100 of the present invention.

[0083] The equation for the above aspheric surface is:

[0084] z=ch 2 / [1+[1-(k+1)c 2 h 2 ] 0.5 ]+A4h 4 +A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h 14 +A 16 h16+A18h 18 +A20

[0085] h 20 +…(1)

[0086] Wherein, z is the position value at a height of h along the optical axis with reference to the surface vertex, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0087] Furthermore, in the optical imaging system 100 provided by the present invention, if the lens surface is convex, it means that the lens surface is convex at the near optical axis Z in principle; if the lens surface is concave, it means that the lens surface is concave at the near optical axis Z in principle.

[0088] In the first embodiment, the first lens 110, the second lens 120 and the third lens 130 respectively satisfy the following condition: |θ1|≤62°, wherein the definition of |θ1| is based on the structure of the first lens 110 as an example. Figure 2The maximum effective radius of the first lens 110 is defined by taking the object side surface 111 as an example, wherein the object side surface 111 of the first lens 110 forms an intersection A with the optical axis Z, and the intersection A is a starting point to define a vertical height L from the optical axis Z at the maximum effective radius, wherein the first lens 110 has an outer peripheral surface 113 on both sides, and the first lens 110 is defined with an imaginary line T passing through the endpoints of the two outer peripheral surfaces 113 and being perpendicular to the optical axis Z, and the imaginary line T intersects the maximum boundary point of the object side surface 111 , whereby the maximum effective radius is defined as the intersection of the imaginary line T and the maximum boundary point of the object side surface 111, wherein a point a1 is defined on the object side surface 111, which is a position corresponding to a vertical height of 0.95*L from the intersection point A to the optical axis Z, and the point a1 has a reference line S1 and a normal vector N1, the reference line S1 passes through the point a1 and is correspondingly parallel to the optical axis Z, the normal vector N1 passes through the point a1 and is correspondingly perpendicular to the object side surface 111, and an intersection angle θ1 is formed between the reference line N1 and the normal vector S1.

[0089] In other words, the definition of the maximum effective radius of the first lens 110 can also be applied to the image-side surface 112 ( Figure 2 (not shown), the image side surface 112 of the first lens 110 and the optical axis Z also form the intersection A, the intersection A is the vertical height L from the optical axis Z defined by the starting point to the maximum effective radius, the imaginary line T intersects with the maximum boundary point of the image side surface 112, thereby the maximum effective radius is defined as the intersection of the imaginary line T and the maximum boundary point of the image side surface 112, and the image side surface 112 is also defined with a point a1 (not shown), the image side surface 112 The position of point a1 of the image side surface 112 is defined in the same manner as that of the object side surface 111, that is, point a1 of the image side surface 112 is a position corresponding to a vertical height of 0.95*L from the intersection point A to the optical axis Z. Point a1 has a reference line S1 and a normal vector N1. The reference line S1 passes through point a1 and is parallel to the optical axis Z. The normal vector N1 passes through point a1 and is perpendicular to the image side surface 112. The reference line S1 and the normal vector N1 form an intersection angle of θ1( Figure 2 (not shown).

[0090] In another preferred embodiment, the first lens 110 is replaced with other lens structures, such as Figure 3The structure of another first lens 110' is shown, and the maximum effective radius of the first lens 110' is defined by taking the object side surface 111' as an example, wherein the object side surface 111' of the first lens 110' forms an intersection A' with the optical axis Z, and the intersection A' is used as a starting point to define a vertical height L' from the optical axis Z to the maximum effective radius, wherein both sides of the first lens 110' respectively have an outer peripheral surface 113', and the first lens 110' is defined with an imaginary line T' passing through the endpoints of the two outer peripheral surfaces 113' and being perpendicular to the optical axis Z, and the imaginary line T' intersects at the maximum boundary point of the object side surface 111'.

[0091] To further illustrate, the first lens 110' has a horizontal profile surface P around the object side surface 111', respectively. The two horizontal profile surfaces P respectively connect the endpoints of the two outer peripheral surfaces 113' and the maximum boundary point of the object side surface 111', and the imaginary line T' overlaps the horizontal profile surfaces P and passes through the two outer peripheral surfaces 113', whereby the maximum effective radius is defined as the intersection of the imaginary line T' and the maximum boundary point of the object side surface 111', wherein a point a1' is defined on the object side surface 111', which is a position corresponding to a vertical height of 0.95*L' from the intersection point A' to the optical axis Z, and the point a1' has a reference line S1' and a normal vector N1', the reference line S1' passes through the point a1' and is correspondingly parallel to the optical axis Z, the normal vector N1' passes through the point a1' and is correspondingly perpendicular to the object side surface 111', and an intersection angle θ1' is formed between the reference line S1' and the normal vector N1'.

[0092] In other words, the definition of the maximum effective radius of the first lens 110' can also be applied to the image side surface 112', such as Figure 3As shown, the image side surface 112' of the first lens 110' and the optical axis Z also form the intersection A', and the intersection A' is defined as the vertical height L' from the optical axis Z from the starting point to the maximum effective radius, wherein the vertical height L' defined at the maximum effective radius of the image side surface 112' is the same as the vertical height L' defined at the maximum effective radius of the object side surface 111', and the imaginary line T' intersects at the maximum boundary point of the image side surface 112', wherein the first lens 110' corresponds to the image side surface 112' around the periphery respectively It has the horizontal contour surface P, and the two horizontal contour surfaces P respectively connect the end points of the two outer peripheral surfaces 113' and the maximum boundary point of the image side surface 112'. The imaginary line T' passes through the two outer peripheral surfaces 113' by overlapping the horizontal contour surfaces P. The maximum effective radius is defined as the intersection of the imaginary line T' and the maximum boundary point of the image side surface 112'. The image side surface 112' is also defined with a point a1' (not shown in the figure). The position definition method of the point a1' of the image side surface 112' is the same as that of the object side surface 111'.

[0093] However, in other embodiments, the first lens 110' can adjust other structures as needed, that is, the vertical height L' of the image side surface 112' is greater than the vertical height L' of the object side surface 111', or the vertical height L' of the image side surface 112' is less than the vertical height L' of the object side surface 111'.

[0094] In addition, the first lens 110' may also be defined in other ways according to the lens structure. Figure 3 For example, the first lens 110' has an optically effective area 110'A and an optically invalid area 110'B, wherein the optical axis Z passes through the optically effective area 110'A, and the optically invalid area 110'B surrounds the optically effective area 110'A. The maximum effective radius of the first lens 110' is defined as the maximum turning point between the optically effective area 110'A and the optically invalid area 110'B.

[0095] In a preferred embodiment, the first lens 110, the second lens 120 and the third lens 130 respectively satisfy the following condition: |θ2|≤52°, wherein the definition of |θ2| is based on the structure of the first lens 110 as an example. Figure 4The maximum effective radius of the first lens 110 is defined by taking the object side surface 111 as an example, wherein the object side surface 111 of the first lens 110 forms an intersection A with the optical axis Z, and the intersection A is used as a starting point to define a vertical height L from the optical axis Z to the maximum effective radius, wherein a point a2 is defined on the object side surface 111, which is a position corresponding to a vertical height of 0.70*L from the intersection A to the optical axis Z, and the point a2 has a reference line S2 and a normal vector N2, the reference line S2 passes through the point a2 and is correspondingly parallel to the optical axis Z, the normal vector N2 passes through the point a2 and is correspondingly perpendicular to the object side surface 111, and an intersection angle θ2 is formed between the reference line S2 and the normal vector N2.

[0096] In other words, the definition of the maximum effective radius of the first lens 110 can also be applied to the image-side surface 112 ( Figure 4 The image side surface 112 of the first lens 110 and the optical axis Z also form the intersection A, and the intersection A is the vertical height L from the optical axis Z defined from the starting point to the maximum effective radius, and a point a2 is also defined on the image side surface 112 (not shown in the figure), and the position of the point a2 on the image side surface 112 is defined in the same manner as that of the object side surface 111.

[0097] In another preferred embodiment, Figure 5 Another structure of a first lens 110' is shown, and the maximum effective radius of the first lens 110' is defined by taking the object side surface 111' as an example, wherein the object side surface 111' of the first lens 110' forms an intersection A' with the optical axis Z, and the intersection A' is used as a starting point to define a vertical height L' from the optical axis Z at the maximum effective radius, and an imaginary line T' of the first lens 110' is perpendicular to the optical axis Z through the endpoints of the two peripheral surfaces 113', and the imaginary line T' intersects the corresponding The maximum boundary point of the object side surface 111' is further described. The first lens 110' has a horizontal contour surface P around the object side surface 111', and the two horizontal contour surfaces P respectively connect the end points of the two outer peripheral surfaces 113' and the maximum boundary point of the object side surface 111'. The imaginary line T' overlaps the horizontal contour surfaces P and passes through the two outer peripheral surfaces 113'. The maximum effective radius is defined as the intersection of the imaginary line T' and the maximum boundary point of the object side surface 111'.

[0098] A point a2' is defined on the object side surface 111', which is a position at a vertical height of 0.70*L' from the intersection A' to the optical axis Z. The point a2' has a reference line S2' and a normal vector N2'. The reference line S2' passes through the point a2' and is parallel to the optical axis Z. The normal vector N2' passes through the point a2' and is perpendicular to the object side surface 111'. The intersection angle between the reference line S2' and the normal vector N2' is θ2'.

[0099] In other words, the definition of the maximum effective radius of the first lens 110' can also be applied to the image side surface 112', such as Figure 5 As shown, the image side surface 112' of the first lens 110' also forms the intersection A' with the optical axis Z, and the intersection A' defines the vertical height L' from the optical axis Z from the starting point to the maximum effective radius, and a point a2' (not shown) is also defined on the image side surface 112', and the position of the point a2' of the image side surface 112' is defined in the same manner as that of the object side surface 111'.

[0100] In addition, the first lens 110' may also be defined in other ways according to the lens structure. Figure 5 For example, the first lens 110' has an optically effective area 110'A and an optically invalid area 110'B, wherein the optical axis Z passes through the optically effective area 110'A, and the optically invalid area 110'B surrounds the optically effective area 110'A, and the maximum effective radius is defined as the maximum turning point between the optically effective area 110'A and the optically invalid area 110'B.

[0101] In a preferred embodiment, the first lens 110, the second lens 120 and the third lens 130 respectively satisfy the following condition: |θ3|≤42°, wherein the definition of |θ3| is based on the structure of the first lens 110 as an example. Figure 6 The maximum effective radius of the first lens 110 is defined by taking the object side surface 111 as an example, wherein the object side surface 111 of the first lens 110 forms an intersection A with the optical axis Z, and the intersection A is a starting point to a maximum effective radius with a vertical height L from the optical axis Z, wherein a point a3 is defined on the object side surface 111, which is a position corresponding to a vertical height of 0.50*L from the intersection A to the optical axis Z, and the point a3 has a reference line S3 and a normal vector N3, wherein the reference line S3 passes through the point a3 and is parallel to the optical axis Z, and the normal vector N3 passes through the point a3 and is perpendicular to the object side surface 111, and an intersection angle θ3 is formed between the reference line S3 and the normal vector N3.

[0102] In other words, the definition of the maximum effective radius of the first lens 110 can also be applied to the image-side surface 112 ( Figure 6 The image side surface 112 of the first lens 110 and the optical axis Z also form the intersection A, and the intersection A is the vertical height L from the optical axis Z defined by the starting point to the maximum effective radius, and a point a3 is also defined on the image side surface 112 (not shown in the figure), and the position of the point a3 of the image side surface 112 is defined in the same manner as that of the object side surface 111.

[0103] In another preferred embodiment, Figure 7 Another structure of a first lens 110' is shown, and the maximum effective radius of the first lens 110' is defined by taking the object side surface 111' as an example, wherein the object side surface 111' of the first lens 110' forms an intersection A' with the optical axis Z, and the intersection A' is used as a starting point to define a vertical height L' from the optical axis Z to the maximum effective radius, and the imaginary line T' of the first lens 110' is perpendicular to the optical axis Z through the endpoints of the two outer peripheral surfaces 113', and the imaginary line T' intersects at The maximum boundary point of the object side surface 111' is further described. The first lens 110' has a horizontal contour surface P around the object side surface 111', and the two horizontal contour surfaces P respectively connect the end points of the two outer peripheral surfaces 113' and the maximum boundary point of the object side surface 111'. The imaginary line T' overlaps the horizontal contour surfaces P and passes through the two outer peripheral surfaces 113'. The maximum effective radius is defined as the intersection of the imaginary line T' and the maximum boundary point of the object side surface 111'.

[0104] A point a3' is defined on the object side surface 111', which is a position at a vertical height of 0.50*L' from the intersection A' to the optical axis Z. The point a3' has a reference line S3' and a normal vector N3'. The reference line S3' passes through the point a3' and is parallel to the optical axis Z. The normal vector N3' passes through the point a3' and is perpendicular to the object side surface 111'. The intersection angle between the reference line S3' and the normal vector N3' is θ3'.

[0105] In other words, the definition of the maximum effective radius of the first lens 110' can also be applied to the image side surface 112', such as Figure 7 As shown, the image side surface 112' of the first lens 110' and the optical axis Z also form the intersection A', and the intersection A' defines the vertical height L' from the optical axis Z from the starting point to the maximum effective radius, and a point a3' (not shown) is also defined on the image side surface 112', and the position of the point a3' of the image side surface 112' is defined in the same manner as that of the object side surface 111'.

[0106] In addition, the first lens 110' may also be defined in other ways according to the lens structure. Figure 7 For example, the first lens 110' has an optically effective area 110'A and an optically invalid area 110'B, wherein the optical axis Z passes through the optically effective area 110'A, and the optically invalid area 110'B surrounds the optically effective area 110'A, and the maximum effective radius is defined as the maximum turning point between the optically effective area 110'A and the optically invalid area 110'B.

[0107] In addition, the first lens 110, the second lens 120 and the third lens 130 respectively satisfy the following conditions: TWL50-TWL40≤30nm, wherein TWL40 is the wavelength of light showing a transmittance of 40% in the respective transmittance curves of the first lens 110, the second lens 120 and the third lens 130, and TWL50 is the wavelength of light showing a transmittance of 50% in the respective transmittance curves of the first lens 110, the second lens 120 and the third lens 130; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm. In this embodiment, the first lens 110, the second lens 120 and the third lens 130 all use the same visible light absorption component, thereby actually selecting the first lens 110 for the spectral transmission wavelength and transmittance test, wherein the test results are shown in Table 1 below.

[0108]

[0109] According to the data in Table 1, the wavelength of light with a spectral transmittance of 40% of the first lens 110 is 869 nm, and the wavelength of light with a spectral transmittance of 50% of the first lens 110 is 875 nm. Thus, the first lens 110 satisfies TWL50-TWL40=6, and meets the condition of TWL50-TWL40≤10 nm.

[0110] Also, see Figure 8 A transmittance curve graph showing that when the wavelength range of the light is greater than 800nm ​​and the incident angles are 0, 10, 20, 30, 40 and 50 degrees, the lens satisfies the following condition: |TA50-TA0|≤10%, wherein, when the wavelength range of the light is greater than 800nm ​​and the light penetrates the lens, TA50 is the transmittance when the incident angle is 50 degrees, and TA0 is the transmittance when the incident angle is 0 degrees.

[0111] In addition, in the first embodiment, the first lens 110 satisfies the following condition: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 150, and IRA100 is an angle at which the lower ray of the light is incident on the object side surface 111 of the lens and corresponds to 1.0*HOI of the imaging surface 150; the third lens 130 satisfies the following condition: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 150, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 112 of the lens and corresponds to 0.70*HOI of the imaging surface 150.

[0112] The first lens 110 , the second lens 120 , and the third lens 130 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0113] In addition, each of the first lens 110, the second lens 120 and the third lens 130 has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0114] The filter 140 is adjacent to the third lens 130. In a preferred embodiment, the filter 140 contains the visible light absorbing component so that the filter 140 also absorbs visible light with a wavelength range between 400nm and 700nm, and the filter 140 transmits light with a wavelength range greater than 800nm.

[0115] In the first embodiment, a light-rejecting film is disposed on the first lens 110 to the third lens 130 and / or the filter 140 , and the light-rejecting film absorbs light with a wavelength range greater than 900 nm.

[0116] The filter 140 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the filter 140, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0117] The filter 140 satisfies the following condition: 13°≤ERA70≤27°, wherein there is a maximum imaging height HOI on the imaging surface 150 , and ERA70 is the angle at which the main light ray of the light is emitted from the image side surface 141 of the filter 140 and corresponds to 0.70*HOI of the imaging surface 150 .

[0118] In addition, the optical filter 140 satisfies the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the optical filter 140 .

[0119] In a preferred embodiment, the optical filter 140 has the anti-reflection film, and the anti-reflection film corresponds to the light with a transmission wavelength range greater than 800 nm.

[0120] Please refer to Table 2 and Table 3 below.

[0121]

[0122]

[0123]

[0124] Table 2 is Figure 1 Detailed structural data of the first embodiment, where the units of curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-10 represent the surfaces from the object side to the image side in sequence. Table 3 is the aspheric surface data of the first embodiment, where k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0125] According to the data in Table 2, the angle data of the normal vector of the position of the control points located at 0.50*L, 0.70*L and 0.95*L on the object side and image side of the first lens 110 to the third lens 130 and the optical axis Z are further obtained as shown in Table 4 below, and the angle of the lower ray of the light incident on the object side surface 111 of the first lens 110 and corresponding to 1.0*HOI of the imaging surface 150, and the angle of the main ray of the light emitted from the image side surface 132 of the third lens 130 and the filter 140 and corresponding to the imaging surface 150 are obtained. 0, the data is shown in Table 5 below; in addition, the optical imaging system 100 may further include an image sensing module (not shown in the figure), which is correspondingly located at the position of the imaging surface 150, whereby light can pass through the first lens 110, the second lens 120, the third lens 130 and the filter 140 and be projected onto the image sensing module, when the image sensing module detects the light and converts it into an electrical signal, the image sensing module transmits the electrical signal to other external components for subsequent processing.

[0126]

[0127]

[0128] Second embodiment:

[0129] See also Figure 11 to Figure 13 , is an optical imaging system 200 according to a second embodiment of the present invention, wherein Fig.11 FIG. 2 is a schematic diagram showing a lens arrangement of an optical imaging system 200 according to a second embodiment of the present invention. Fig.12 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 200 of the second embodiment. Fig.13 is a diagram showing the infrared light spectrum modulation conversion characteristics of the second embodiment. Fig.11 It can be seen that the optical imaging system 200 includes an aperture ST, a first lens 210 , a second lens 220 , a third lens 230 and an imaging surface 240 in sequence from the object side to the image side along an optical axis Z.

[0130] The first lens 210 is a biconvex lens with positive refractive power, which means that both the object side surface 211 and the image side surface 212 of the first lens 210 are convex surfaces, wherein at least one of the object side surface 211 and the image side surface 212 of the first lens 210 is an aspherical surface. In the second embodiment, both the object side surface 211 and the image side surface 212 of the first lens 210 are aspherical surfaces, and the first lens 210 is a filter lens made of plastic material. The first lens 210 includes at least one visible light absorbing component, and the visible light absorbing component can be an azo dye or a porphyrin dye. The first lens 210 can effectively change the absorption of a specific wavelength by adding the visible light absorbing component, so that the first lens 210 correspondingly absorbs visible light in the wavelength range between 400nm and 700nm, and the lens correspondingly transmits light in the wavelength range greater than 800nm, so as to maintain a high pass rate of infrared light.

[0131] The second lens 220 is a negative refractive power meniscus lens, which means that the object side surface 221 of the second lens 220 is a concave surface, and the image side surface 222 of the second lens 220 is a convex surface, wherein at least one of the object side surface 221 and the image side surface 222 of the second lens 220 is an aspherical surface. In the second embodiment, both the object side surface 221 and the image side surface 222 of the second lens 220 are aspherical surfaces, and the second lens 220 is a plastic filter lens. The second lens 220 includes the visible light absorbing component, whereby the second lens 220 absorbs visible light in a wavelength range between 400nm and 700nm, and the second lens 220 transmits light in a wavelength range greater than 800nm.

[0132] The third lens 230 is a convex-concave lens with positive refractive power, which means that the object-side surface 231 of the third lens 230 is a convex surface, and the image-side surface 232 of the third lens 230 is a concave surface, wherein at least one of the object-side surface 231 and the image-side surface 232 of the third lens 230 is an aspherical surface. In the second embodiment, both the object-side surface 231 and the image-side surface 232 of the third lens 230 are aspherical surfaces, and the third lens 230 is a filter lens made of plastic material. The third lens 230 includes the visible light absorbing component, whereby the third lens 230 correspondingly absorbs visible light in the wavelength range between 400nm and 700nm, and the third lens 230 correspondingly transmits light in the wavelength range greater than 800nm.

[0133] The equation for the above aspheric surface is:

[0134] z=ch 2 / [1+[1-(k+1)c 2 h 2 ] 0.5 ]+A4h 4 +A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h 14 +A 16 h16+A18h 18 +A20

[0135] h 20 +…(1)

[0136] Wherein, z is the position value at a height of h along the optical axis Z direction with the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0137] In the second embodiment, the first lens 210, the second lens 220 and the third lens 230 respectively satisfy the following conditions: |θ1|≤62°, |θ2|≤52°, |θ3|≤42°; wherein, the definitions of |θ1|, |θ2| and |θ3| are the same as those of the first embodiment, which will not be repeated here.

[0138] In addition, the first lens 210 , the second lens 220 and the third lens 230 respectively satisfy the following conditions: TWL50-TWL40≤30nm; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm.

[0139] In addition, the first lens 210, the second lens 220 and the third lens 230 respectively satisfy the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the lens, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0140] In addition, in the second embodiment, the first lens 210 satisfies the following condition: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 240, and IRA100 is an angle at which the lower ray of the light is incident on the object side surface 211 of the first lens 210 and corresponds to 1.0*HOI of the imaging surface 240; the third lens 230 satisfies the following condition: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 240, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 232 of the third lens 230 and corresponds to 0.70*HOI of the imaging surface 240.

[0141] The first lens 210 , the second lens 220 , and the third lens 230 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0142] In addition, each of the first lens 210, the second lens 220 and the third lens 230 has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0143] Please refer to Table 6 and Table 7 below.

[0144]

[0145]

[0146]

[0147] Table 6 Fig.11Detailed structural data of the second embodiment, where the units of curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-8 represent the surfaces from the object side to the image side in sequence. Table 7 is the aspheric surface data of the second embodiment, where k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0148] According to the data in Table 6, the angle data of the normal vector of the position on the control points located at 0.50*L, 0.70*L and 0.95*L respectively on the object side and image side of the first lens 210 to the third lens 230 and the optical axis Z are further obtained as shown in Table 8 below, and the angle of the lower ray of the light incident on the object side surface 211 of the first lens 210 and corresponding to 1.0*HOI of the imaging surface 240, and the angle of the main ray of the light emitted from the image side surface 232 of the third lens 230 and corresponding to 0.70*HOI of the imaging surface 240 are obtained, and the data are shown in Table 9 below.

[0149]

[0150]

[0151]

[0152] Third embodiment:

[0153] See also Figure 14 to Figure 16 , is an optical imaging system 300 according to a third embodiment of the present invention, wherein Fig.14 FIG. 4 is a schematic diagram showing a lens arrangement of an optical imaging system 300 according to a third embodiment of the present invention. Fig.15 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 300 of the third embodiment. Fig.16 is a diagram showing the infrared light spectrum modulation conversion characteristics of the third embodiment. Fig.14 It can be seen that the optical imaging system 300 includes an aperture ST, a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a filter 350 and an imaging surface 360 ​​in sequence from the object side to the image side along an optical axis Z.

[0154] The first lens 310 is a convex-concave lens with positive refractive power, which means that the object-side surface 311 of the first lens 310 is a convex surface, and the image-side surface 312 of the first lens 310 is a concave surface, wherein at least one of the object-side surface 311 and the image-side surface 312 of the first lens 310 is an aspherical surface. In the third embodiment, both the object-side surface 311 and the image-side surface 312 of the first lens 310 are aspherical surfaces, and the first lens 310 is made of plastic and does not contain the visible light absorbing component, which means that the first lens 310 does not absorb visible light, and thus the first lens 310 corresponds to transmitting visible light.

[0155] The second lens 320 is a positive refracting power meniscus lens, which means that the object side surface 321 of the second lens 320 is a concave surface, and the image side surface 322 of the second lens 320 is a convex surface, wherein at least one of the object side surface 321 and the image side surface 322 of the second lens 320 is an aspherical surface. In the third embodiment, both the object side surface 321 and the image side surface 322 of the second lens 320 are aspherical surfaces, and the second lens 320 is a plastic filter lens. The second lens 320 includes the visible light absorption component, whereby the second lens 320 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the second lens 320 correspondingly transmits light in a wavelength range greater than 800nm.

[0156] The third lens 330 is a positive refractive power meniscus lens, which means that the object side surface 331 of the third lens 330 is a concave surface, and the image side surface 332 of the third lens 330 is a convex surface, wherein at least one of the object side surface 331 and the image side surface 332 of the third lens 330 is an aspherical surface. In the third embodiment, both the object side surface 331 and the image side surface 332 of the third lens 330 are aspherical surfaces, and the third lens 330 is made of plastic material and does not include the visible light absorption component.

[0157] The fourth lens 340 is a convex-concave lens with negative refractive power, which means that the object-side surface 341 of the fourth lens 340 is a convex surface, and the image-side surface 342 of the fourth lens 340 is a concave surface, wherein at least one of the object-side surface 341 and the image-side surface 342 of the fourth lens 340 is an aspherical surface. In the third embodiment, both the object-side surface 341 and the image-side surface 342 of the fourth lens 340 are aspherical surfaces, and the fourth lens 340 is made of plastic material and does not include the visible light absorption component.

[0158] The equation for the above aspheric surface is:

[0159] z=ch 2 / [1+[1-(k+1)c 2 h 2 ] 0.5 ]+A4h 4+A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h 14 +A 16 h16+A18h 18 +A20

[0160] h 20 +…(1)

[0161] Wherein, z is the position value at a height of h along the optical axis Z direction with the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0162] In the third embodiment, the second lens 320 satisfies the following conditions: |θ1|≤62°, |θ2|≤52°, |θ3|≤42°; wherein, the definitions of |θ1|, |θ2| and |θ3| are the same as those of the first embodiment, which will not be repeated here.

[0163] In addition, the second lens 320 satisfies the following conditions: TWL50-TWL40≤30nm; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm.

[0164] In addition, the second lens 320 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the lens, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0165] In addition, in the third embodiment, the first lens 310 satisfies the following condition: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 360, and IRA100 is an angle at which the lower ray of the light is incident on the object side 311 of the first lens 310 and corresponds to 1.0*HOI of the imaging surface 360; the fourth lens 340 satisfies the following condition: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 360, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 342 of the fourth lens 340 and corresponds to 0.70*HOI of the imaging surface 360.

[0166] The first lens 310 , the second lens 320 , the third lens 330 , and the fourth lens 340 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0167] In addition, the second lens 320 has an anti-reflection film, which corresponds to the light with a transmission wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0168] The filter 350 is adjacent to the fourth lens 340. In a preferred embodiment, the filter 350 contains the visible light absorbing component so that the filter 350 also absorbs visible light in the wavelength range between 400nm and 700nm, and the filter 350 transmits light in the wavelength range greater than 800nm.

[0169] In the third embodiment, a light filter film is provided on the second lens 320 and / or the filter 350 , and the light filter film absorbs light with a wavelength range greater than 900 nm.

[0170] The filter 350 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the filter 350, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0171] The filter 350 satisfies the following condition: 13°≤ERA70≤27°, wherein there is a maximum imaging height HOI on the imaging surface 360 ​​, and ERA70 is the angle at which the main light ray of the light is emitted from the image side surface 352 of the filter 350 and corresponds to 0.70*HOI of the imaging surface 360 ​​.

[0172] In addition, the optical filter 350 satisfies the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the optical filter 350 .

[0173] In a preferred embodiment, the optical filter 350 has the anti-reflection film, and the anti-reflection film corresponds to the light with a penetration wavelength range greater than 800 nm.

[0174] Please refer to Table 10 and Table 11 below.

[0175]

[0176]

[0177]

[0178] Table 10 Fig.14 Detailed structural data of the third embodiment, where the units of curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-12 represent the surfaces from the object side to the image side in sequence. Table 10 is the aspheric surface data of the third embodiment, where k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0179] According to the data in Table 10, the angle data of the normal vector of the position of the control points at 0.50*L, 0.70*L and 0.95*L on the object side and image side of the second lens 320 and the optical axis Z are further obtained as shown in Table 12 below, and the angle of the lower ray of the light incident on the object side surface 311 of the first lens 310 and corresponding to 1.0*HOI of the imaging surface 360, and the angle of the main ray of the light emitted from the image side surface 342 of the fourth lens 340 and the filter 350 and corresponding to 0.70*HOI of the imaging surface 360 ​​are obtained, and the data are shown in Table 13 below.

[0180]

[0181]

[0182]

[0183] Fourth embodiment:

[0184] See also Figure 17 to Figure 19 , is an optical imaging system 400 according to a fourth embodiment of the present invention, wherein Fig.17 FIG. 4 is a schematic diagram showing a lens arrangement of an optical imaging system 400 according to a fourth embodiment of the present invention. Fig.18 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 400 of the fourth embodiment. Fig.19 is a diagram showing the infrared light spectrum modulation conversion characteristics of the fourth embodiment. Fig.17 It can be seen that the optical imaging system 400 includes a first lens 410, a second lens 420, a third lens 430, an aperture ST, a fourth lens 440, a fifth lens 450, a filter 460 and an imaging surface 470 in sequence from the object side to the image side along an optical axis Z.

[0185] The first lens 410 is a convex-concave lens with negative refractive power, which means that the object-side surface 411 of the first lens 410 is convex, and the image-side surface 412 of the first lens 410 is concave, wherein at least one of the object-side surface 411 and the image-side surface 412 of the first lens 410 is an aspherical surface. In the fourth embodiment, both the object-side surface 411 and the image-side surface 412 of the first lens 410 are aspherical surfaces. The first lens 410 is a filter lens made of plastic material. The first lens 410 includes the visible light absorption component, whereby the first lens 410 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the first lens 410 correspondingly transmits light in a wavelength range greater than 800nm.

[0186] The second lens 420 is a double concave lens with negative refractive power, which means that both the object-side surface 421 and the image-side surface 422 of the second lens 420 are concave surfaces, wherein at least one of the object-side surface 421 and the image-side surface 422 of the second lens 420 is an aspherical surface. In the fourth embodiment, both the object-side surface 421 and the image-side surface 422 of the second lens 420 are aspherical surfaces, and the second lens 420 is a filter lens made of plastic material. The second lens 420 includes the visible light absorbing component, whereby the second lens 420 absorbs visible light with a wavelength range between 400nm and 700nm, and the second lens 420 transmits light with a wavelength range greater than 800nm.

[0187] The third lens 430 is a biconvex lens with positive refractive power, which means that the object side surface 431 and the image side surface 432 of the third lens 430 are both convex surfaces, wherein at least one of the object side surface 431 and the image side surface 432 of the third lens 430 is an aspherical surface. In the fourth embodiment, the object side surface 431 and the image side surface 432 of the third lens 430 are both aspherical surfaces. The third lens 430 is a filter lens made of plastic material. The third lens 430 includes the visible light absorption component, whereby the third lens 430 absorbs visible light with a wavelength range between 400nm and 700nm, and the third lens 430 transmits light with a wavelength range greater than 800nm.

[0188] The fourth lens 440 is a biconvex lens with positive refractive power, which means that the object-side surface 441 and the image-side surface 442 of the fourth lens 440 are both convex surfaces, wherein at least one of the object-side surface 441 and the image-side surface 442 of the fourth lens 440 is an aspherical surface. In the fourth embodiment, the object-side surface 441 and the image-side surface 442 of the fourth lens 440 are both aspherical surfaces. The fourth lens 440 is a filter lens made of plastic material. The fourth lens 440 includes the visible light absorbing component, whereby the fourth lens 440 absorbs visible light with a wavelength range between 400nm and 700nm, and transmits light with a wavelength range greater than 800nm.

[0189] The fifth lens 450 is a positive refracting power meniscus lens, which means that the object-side surface 451 of the fifth lens 450 is a concave surface, and the image-side surface 452 of the fifth lens 450 is a convex surface, wherein at least one of the object-side surface 451 and the image-side surface 452 of the fifth lens 450 is an aspherical surface. In the fourth embodiment, both the object-side surface 451 and the image-side surface 452 of the fifth lens 450 are aspherical surfaces, and the fifth lens 450 is made of plastic material and does not include the visible light absorption component.

[0190] The equation for the above aspheric surface is:

[0191] z=ch 2 / [1+[1-(k+1)c 2 h 2 ] 0.5 ]+A4h 4 +A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h 14 +A 16 h16+A18h 18 +A20

[0192] h 20 +…(1)

[0193] Wherein, z is the position value at a height of h along the optical axis Z direction with the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0194] In the fourth embodiment, the first lens 410 to the fourth lens 440 respectively satisfy the following conditions: |θ1|≤62°, |θ2|≤52°, |θ3|≤42°; wherein, the definitions of |θ1|, |θ2| and |θ3| are the same as those of the first embodiment, which will not be repeated here.

[0195] In addition, the first lens 410 to the fourth lens 440 respectively satisfy the following conditions: TWL50-TWL40≤30nm; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm.

[0196] In addition, the first lens 410 to the fourth lens 440 respectively satisfy the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the lens, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0197] In addition, in the fourth embodiment, the first lens 410 satisfies the following conditions: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 470, and IRA100 is an angle at which the lower ray of the light is incident on the object side surface 411 of the first lens 410 and corresponds to 1.0*HOI of the imaging surface 470; the fifth lens 450 satisfies the following conditions: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 470, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 452 of the fifth lens 450 and corresponds to 0.70*HOI of the imaging surface 470.

[0198] The first lens 410 to the fifth lens 450 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0199] In addition, each of the first lens 410 to the fourth lens 440 has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0200] The filter 460 is adjacent to the fifth lens 450. In a preferred embodiment, the filter 460 contains the visible light absorbing component so that the filter 460 also absorbs visible light in the wavelength range between 400nm and 700nm, and the filter 460 transmits light in the wavelength range greater than 800nm.

[0201] In the fourth embodiment, a light-rejecting film is disposed on the first lens 410 to the fourth lens 440 and / or the filter 460 , and the light-rejecting film absorbs light with a wavelength range greater than 900 nm.

[0202] The filter 460 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the filter 460, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0203] The filter 460 satisfies the following condition: 13°≤ERA70≤27°, wherein there is a maximum imaging height HOI on the imaging surface 470 , and ERA70 is the angle at which the main light ray of the light is emitted from the image side surface 462 of the filter 460 and corresponds to 0.70*HOI of the imaging surface 470 .

[0204] In addition, the optical filter 460 satisfies the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the optical filter 460 .

[0205] In a preferred embodiment, the optical filter 460 has the anti-reflection film, and the anti-reflection film corresponds to the light with a penetration wavelength range greater than 800 nm.

[0206] Please refer to Table 14 and Table 15 below.

[0207]

[0208]

[0209]

[0210]

[0211] Table 14 is Fig.17 Detailed structural data of the fourth embodiment, where the units of the curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-14 represent the surfaces from the object side to the image side in sequence. Table 14 is the aspheric surface data of the fourth embodiment, where k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0212] According to the data in Table 14, the angle data of the normal vectors of the positions on the control points at 0.50*L, 0.70*L and 0.95*L on the object side and image side of the first lens 410 to the fourth lens 440 and the optical axis Z are further obtained as shown in Table 16 below, and the angle of the lower ray of the light incident on the object side surface 411 of the first lens 410 and corresponding to 1.0*HOI of the imaging surface 470, and the angle of the main ray of the light emitted from the image side surface 452 of the fifth lens 450 and the filter 460 and corresponding to 0.70*HOI of the imaging surface 470 are obtained, and the data are shown in Table 17 below.

[0213]

[0214]

[0215]

[0216] Fifth embodiment:

[0217] See also Figure 20 to Figure 22 , is an optical imaging system 500 according to a fifth embodiment of the present invention, wherein Fig. 20 FIG. 4 is a schematic diagram showing a lens arrangement of an optical imaging system 500 according to a fifth embodiment of the present invention. Fig.21 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 500 of the fifth embodiment. Fig. 22 is a diagram showing the infrared light spectrum modulation conversion characteristics of the fifth embodiment. Fig. 20 It can be seen that the optical imaging system 500 includes an aperture ST, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a filter 560 and an imaging surface 570 in sequence from the object side to the image side along an optical axis Z.

[0218] The first lens 510 is a biconvex lens with positive refractive power, which means that both the object-side surface 511 and the image-side surface 512 of the first lens 510 are convex surfaces, wherein at least one of the object-side surface 511 and the image-side surface 512 of the first lens 510 is an aspherical surface. In the fifth embodiment, both the object-side surface 511 and the image-side surface 512 of the first lens 510 are aspherical surfaces. The first lens 510 is a filter lens made of plastic material. The first lens 510 includes the visible light absorption component, whereby the first lens 510 absorbs visible light with a wavelength range between 400nm and 700nm, and transmits light with a wavelength range greater than 800nm.

[0219] The second lens 520 is a biconcave lens with negative refractive power, which means that the object-side surface 521 and the image-side surface 522 of the second lens 520 are both concave surfaces, wherein at least one of the object-side surface 521 and the image-side surface 522 of the second lens 520 is an aspherical surface. In the fifth embodiment, the object-side surface 511 and the image-side surface 522 of the second lens 520 are both aspherical surfaces, and the second lens 520 is made of plastic and does not include the visible light absorption component.

[0220] The third lens 530 is a convex-concave lens with positive refractive power, which means that the object side surface 531 of the third lens 530 is a convex surface, and the image side surface 532 of the third lens 530 is a concave surface, wherein at least one of the object side surface 531 and the image side surface 532 of the third lens 530 is an aspherical surface. In the fifth embodiment, both the object side surface 531 and the image side surface 532 of the third lens 530 are aspherical surfaces, and the third lens 530 is made of plastic material and does not contain the visible light absorption component.

[0221] The fourth lens 540 is a positive refracting power meniscus lens, which means that the object side surface 541 of the fourth lens 540 is a concave surface, and the image side surface 542 of the fourth lens 540 is a convex surface, wherein at least one of the object side surface 541 and the image side surface 542 of the fourth lens 540 is an aspherical surface. In the fifth embodiment, both the object side surface 541 and the image side surface 542 of the fourth lens 540 are aspherical surfaces. The fourth lens 540 is a filter lens made of plastic material. The fourth lens 540 includes the visible light absorbing component, whereby the fourth lens 540 correspondingly absorbs visible light in the wavelength range between 400nm and 700nm, and the fourth lens 540 correspondingly transmits light in the wavelength range greater than 800nm.

[0222] The fifth lens 550 is a negative refractive power meniscus lens, which means that the object side surface 551 of the fifth lens 550 is a concave surface, and the image side surface 552 of the fifth lens 550 is a convex surface, wherein at least one of the object side surface 551 and the image side surface 552 of the fifth lens 550 is an aspherical surface. In the fifth embodiment, both the object side surface 551 and the image side surface 552 of the fifth lens 550 are aspherical surfaces. The fifth lens 550 is a filter lens made of plastic material. The fifth lens 550 includes the visible light absorbing component, whereby the fifth lens 550 absorbs visible light in a wavelength range between 400nm and 700nm, and transmits light in a wavelength range greater than 800nm.

[0223] The equation for the above aspheric surface is:

[0224] z=ch 2 / [1+[1-(k+1)c 2 h 2 ]0.5 ]+A4h 4 +A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h 14 +A 16 h16+A18h 18 +A20

[0225] h 20 +…(1)

[0226] Wherein, z is the position value at a height of h along the optical axis Z direction with the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0227] In the fifth embodiment, the first lens 510, the fourth lens 540 and the fifth lens 550 respectively satisfy the following conditions: |θ1|≤62°, |θ2|≤52°, |θ3|≤42°; wherein, the definitions of |θ1|, |θ2| and |θ3| are the same as those of the first embodiment, which will not be repeated herein.

[0228] In addition, the first lens 510, the fourth lens 540 and the fifth lens 550 respectively satisfy the following conditions: TWL50-TWL40≤30nm; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm.

[0229] In addition, the first lens 510, the fourth lens 540 and the fifth lens 550 respectively satisfy the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the lens, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0230] In addition, in the fifth embodiment, the first lens 510 satisfies the following conditions: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 570, and IRA100 is an angle at which the lower ray of the light is incident on the object side surface 511 of the first lens 510 and corresponds to 1.0*HOI of the imaging surface 570; the fifth lens 550 satisfies the following conditions: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 570, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 552 of the fifth lens 550 and corresponds to 0.70*HOI of the imaging surface 570.

[0231] The first lens 510 to the fifth lens 550 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0232] In addition, each of the first lens 510, the fourth lens 540 and the fifth lens 550 has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0233] The filter 560 is adjacent to the fifth lens 550. In a preferred embodiment, the filter 560 contains the visible light absorbing component so that the filter 560 also corresponds to absorbing visible light in the wavelength range between 400nm and 700nm, and the filter 560 corresponds to penetrating light in the wavelength range greater than 800nm.

[0234] In the fifth embodiment, a light-rejecting film is disposed on the first lens 510 to the fourth lens 540 and / or the filter 560 , and the light-rejecting film absorbs light with a wavelength range greater than 900 nm.

[0235] The filter 560 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the filter 560, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0236] The filter 560 satisfies the following condition: 13°≤ERA70≤27°, wherein there is a maximum imaging height HOI on the imaging surface 570 , and ERA70 is the angle at which the main light ray of the light is emitted from the image side surface 562 of the filter 560 and corresponds to 0.70*HOI of the imaging surface 570 .

[0237] In addition, the optical filter 560 satisfies the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the optical filter 560 .

[0238] In a preferred embodiment, the filter 560 has the anti-reflection film, and the anti-reflection film corresponds to the light with a penetration wavelength range greater than 800 nm.

[0239] Please refer to Table 18 and Table 19 below.

[0240]

[0241]

[0242]

[0243]

[0244] Table 18 Fig. 20 Detailed structural data of the fifth embodiment, where the units of the curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-14 represent the surfaces from the object side to the image side in sequence. Table 18 is the aspheric surface data of the fifth embodiment, where k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0245] According to the data in Table 18, the angle data of the normal vectors of the positions on the control points of 0.50*L, 0.70*L and 0.95*L on the object side and image side of the first lens 510, the fourth lens 540 and the fifth lens 550 and the optical axis Z are further obtained as shown in Table 20 below, and the angle of the lower ray of the light incident on the object side surface 511 of the first lens 510 and corresponding to 1.0*HOI of the imaging surface, and the angle of the main ray of the light emitted from the image side surface 552 of the fifth lens 550 and the filter 560 and corresponding to 0.70*HOI of the imaging surface 570 are obtained, and the data are shown in Table 21 below.

[0246]

[0247]

[0248]

[0249] Sixth embodiment:

[0250] See also Figure 23 to Figure 25 , is an optical imaging system 600 according to a sixth embodiment of the present invention, wherein Fig.23 FIG. 4 is a schematic diagram showing a lens arrangement of an optical imaging system 600 according to a sixth embodiment of the present invention. Fig.24 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 600 of the sixth embodiment. Fig.25 is a diagram showing the infrared light spectrum modulation conversion characteristics of the sixth embodiment. Fig.23It can be seen that the optical imaging system 600 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, an aperture ST, a fifth lens 650, a sixth lens 660, a filter 670 and an imaging surface 680 in sequence from the object side to the image side along an optical axis Z.

[0251] The first lens 610 is a convex-concave lens with negative refractive power, which means that the object-side surface 611 of the first lens 610 is convex, and the image-side surface 612 of the first lens 610 is concave, wherein at least one of the object-side surface 611 and the image-side surface 612 of the first lens 610 is aspherical. In the sixth embodiment, both the object-side surface 611 and the image-side surface 612 of the first lens 610 are aspherical. The first lens 610 is a filter lens made of plastic material. The first lens 610 includes the visible light absorbing component, whereby the first lens 610 absorbs visible light with a wavelength range between 400nm and 700nm, and transmits light with a wavelength range greater than 800nm.

[0252] The second lens 620 is a convex-concave lens with negative refractive power, which means that the object-side surface 621 of the second lens 620 is convex, and the image-side surface 622 of the second lens 620 is concave, wherein at least one of the object-side surface 621 and the image-side surface 622 of the second lens 620 is an aspherical surface. In the sixth embodiment, both the object-side surface 621 and the image-side surface 622 of the second lens 620 are aspherical surfaces, and the second lens 620 is a filter lens made of plastic material. The second lens 620 includes the visible light absorbing component, whereby the second lens 620 absorbs visible light in a wavelength range between 400nm and 700nm, and the second lens 620 transmits light in a wavelength range greater than 800nm.

[0253] The third lens 630 is a convex-concave lens with positive refractive power, which means that the object-side surface 631 of the third lens 630 is a convex surface, and the image-side surface 632 of the third lens 630 is a concave surface, wherein at least one of the object-side surface 631 and the image-side surface 632 of the third lens 630 is an aspherical surface. In the sixth embodiment, both the object-side surface 631 and the image-side surface 632 of the third lens 630 are aspherical surfaces, and the third lens 630 is made of plastic and does not contain the visible light absorption component.

[0254] The fourth lens 640 is a biconvex lens with positive refractive power, which means that the object-side surface 641 and the image-side surface 642 of the fourth lens 640 are both convex surfaces, wherein at least one of the object-side surface 641 and the image-side surface 642 of the fourth lens 640 is an aspherical surface. In the sixth embodiment, the object-side surface 641 and the image-side surface 642 of the fourth lens 640 are both aspherical surfaces. The fourth lens 640 is a filter lens made of plastic material. The fourth lens 640 includes the visible light absorbing component, whereby the fourth lens 640 absorbs visible light with a wavelength range between 400nm and 700nm, and transmits light with a wavelength range greater than 800nm.

[0255] The fifth lens 650 is a biconvex lens with positive refractive power, which means that the object-side surface 651 and the image-side surface 652 of the fifth lens 650 are both convex surfaces, wherein at least one of the object-side surface 651 and the image-side surface 652 of the fifth lens 650 is an aspherical surface. In the sixth embodiment, the object-side surface 651 and the image-side surface 652 of the fifth lens 650 are both aspherical surfaces. The fifth lens 650 is a filter lens made of plastic material. The fifth lens 650 includes the visible light absorbing component, whereby the fifth lens 650 absorbs visible light in a wavelength range between 400nm and 700nm, and transmits light in a wavelength range greater than 800nm.

[0256] The sixth lens 660 is a biconcave lens with negative refractive power, which means that the object-side surface 661 and the image-side surface 662 of the sixth lens 660 are both concave surfaces, wherein at least one of the object-side surface 661 and the image-side surface 662 of the sixth lens 660 is an aspherical surface. In the sixth embodiment, the object-side surface 661 and the image-side surface 662 of the sixth lens 660 are both aspherical surfaces, and the sixth lens 660 is made of plastic and does not include the visible light absorption component.

[0257] The equation for the above aspheric surface is:

[0258] z=ch 2 / [1+[1-(k+1)c 2 h 2 ] 0.5 ]+A4h 4 +A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h 14 +A 16 h16+A18h 18 +A20

[0259] h 20 +…(1)

[0260] Wherein, z is the position value at a height of h along the optical axis Z direction with the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0261] In the sixth embodiment, the first lens 610, the second lens 620, the fourth lens 640 and the fifth lens 650 respectively satisfy the following conditions: |θ1|≤62°, |θ2|≤52°, |θ3|≤42°; wherein, the definitions of |θ1|, |θ2| and |θ3| are the same as those of the first embodiment, which will not be repeated herein.

[0262] In addition, the first lens 610 , the second lens 620 , the fourth lens 640 and the fifth lens 650 respectively satisfy the following conditions: TWL50-TWL40≤30nm; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm.

[0263] In addition, the first lens 610, the second lens 620, the fourth lens 640 and the fifth lens 650 respectively satisfy the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the lens, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0264] In addition, in the sixth embodiment, the first lens 610 satisfies the following conditions: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 680, and IRA100 is an angle at which the lower ray of the light is incident on the object side surface 611 of the first lens 610 and corresponds to 1.0*HOI of the imaging surface 680; the sixth lens 660 satisfies the following conditions: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 680, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 662 of the sixth lens 660 and corresponds to 0.70*HOI of the imaging surface 680.

[0265] The first lens 610 to the sixth lens 660 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0266] In addition, each of the first lens 610, the second lens 620, the fourth lens 640 and the fifth lens 650 has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0267] The optical filter 670 is adjacent to the sixth lens 660. In a preferred embodiment, the optical filter 670 contains the visible light absorbing component so that the optical filter 670 also corresponds to absorbing visible light in the wavelength range between 400nm and 700nm, and the optical filter 670 corresponds to penetrating light in the wavelength range greater than 800nm.

[0268] In the sixth embodiment, a light-rejecting film is disposed on the first lens 610 to the fourth lens 640 and / or the filter 670 , and the light-rejecting film absorbs light with a wavelength range greater than 900 nm.

[0269] The filter 670 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the filter 670, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0270] The filter 670 satisfies the following condition: 13°≤ERA70≤27°, wherein there is a maximum imaging height HOI on the imaging surface 680 , and ERA70 is the angle at which the main light ray of the light is emitted from the image side surface 672 of the filter 670 and corresponds to 0.70*HOI of the imaging surface 680 .

[0271] In addition, the optical filter 670 satisfies the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the optical filter 670 .

[0272] In a preferred embodiment, the optical filter 670 has the anti-reflection film, and the anti-reflection film corresponds to the light with a penetration wavelength range greater than 800 nm.

[0273] Please refer to Table 22 and Table 23 below.

[0274]

[0275]

[0276]

[0277]

[0278] Table 22 Fig.23 Detailed structural data of the sixth embodiment, where the units of the curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-16 represent the surfaces from the object side to the image side in sequence. Table 22 is the aspheric surface data of the sixth embodiment, where k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0279] According to the data in Table 22, the angle data of the normal vectors of the positions on the object side and image side of the first lens 610, the second lens 620, the fourth lens 640 and the fifth lens 650 at the control points of 0.50*L, 0.70*L and 0.95*L respectively and the optical axis Z are further obtained as shown in Table 24 below, and the angle of the lower ray of the light incident on the object side surface 611 of the first lens 610 and corresponding to 1.0*HOI of the imaging surface 680, and the angle of the main ray of the light emitted from the image side surface 662 of the sixth lens 660 and the filter 670 and corresponding to 0.70*HOI of the imaging surface 680 are obtained, and the data are shown in Table 25 below.

[0280]

[0281]

[0282]

[0283] Seventh embodiment:

[0284] See also Figure 26 to Figure 28 , is an optical imaging system 700 according to a seventh embodiment of the present invention, wherein Fig.26 FIG. 4 is a schematic diagram showing a lens arrangement of an optical imaging system 700 according to a seventh embodiment of the present invention. Fig. 27 From left to right are the longitudinal spherical aberration, astigmatism and optical distortion curves of the optical imaging system 700 of the seventh embodiment. Fig.28 is a diagram showing the infrared light spectrum modulation conversion characteristics of the seventh embodiment. Fig.26 It can be seen that the optical imaging system 700 includes a first lens 710, a second lens 720, an aperture ST, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, a filter 780 and an imaging surface 790 in sequence from the object side to the image side along an optical axis Z.

[0285] The first lens 710 is a convex-concave lens with negative refractive power, which means that the object-side surface 711 of the first lens 710 is a convex surface, and the image-side surface 712 of the first lens 710 is a concave surface, wherein at least one of the object-side surface 711 and the image-side surface 712 of the first lens 710 is an aspherical surface. In the seventh embodiment, both the object-side surface 711 and the image-side surface 712 of the first lens 710 are aspherical surfaces, and the first lens 710 is made of plastic and does not contain the visible light absorption component.

[0286] The second lens 720 is a biconvex lens with positive refractive power, which means that both the object-side surface 721 and the image-side surface 722 of the second lens 720 are convex surfaces, wherein at least one of the object-side surface 721 and the image-side surface 722 of the second lens 720 is an aspherical surface. In the seventh embodiment, both the object-side surface 721 and the image-side surface 722 of the second lens 720 are aspherical surfaces, and the second lens 720 is a filter lens made of plastic material. The second lens 720 includes the visible light absorbing component, whereby the second lens 720 absorbs visible light in a wavelength range between 400nm and 700nm, and the second lens 720 transmits light in a wavelength range greater than 800nm.

[0287] The third lens 730 is a biconvex lens with positive refractive power, which means that the object side surface 731 and the image side surface 732 of the third lens 730 are both convex surfaces, wherein at least one of the object side surface 731 and the image side surface 732 of the third lens 730 is an aspherical surface. In the seventh embodiment, the object side surface 731 and the image side surface 732 of the third lens 730 are both aspherical surfaces. The third lens 730 is a filter lens made of plastic material. The third lens 730 includes the visible light absorption component, whereby the third lens 730 corresponds to absorbing visible light in the wavelength range between 400nm and 700nm, and the third lens 730 corresponds to penetrating light in the wavelength range greater than 800nm.

[0288] The fourth lens 740 is a double concave lens with negative refractive power, which means that both the object-side surface 741 and the image-side surface 742 of the fourth lens 740 are concave surfaces, wherein at least one of the object-side surface 741 and the image-side surface 742 of the fourth lens 740 is an aspherical surface. In the seventh embodiment, both the object-side surface 741 and the image-side surface 742 of the fourth lens 740 are aspherical surfaces. The fourth lens 740 is a filter lens made of plastic material. The fourth lens 740 includes the visible light absorbing component, whereby the fourth lens 740 absorbs visible light with a wavelength range between 400nm and 700nm, and transmits light with a wavelength range greater than 800nm.

[0289] The fifth lens 750 is a biconvex lens with positive refractive power, which means that the object-side surface 751 and the image-side surface 752 of the fifth lens 750 are both convex surfaces, wherein at least one of the object-side surface 751 and the image-side surface 752 of the fifth lens 750 is an aspherical surface. In the seventh embodiment, the object-side surface 751 and the image-side surface 752 of the fifth lens 750 are both aspherical surfaces. The fifth lens 750 is a filter lens made of plastic material. The fifth lens 750 includes the visible light absorbing component, whereby the fifth lens 750 absorbs visible light in a wavelength range between 400nm and 700nm, and transmits light in a wavelength range greater than 800nm.

[0290] The sixth lens 760 is a positive refractive power meniscus lens, which means that the object side surface 761 of the sixth lens 760 is a concave surface, and the image side surface 762 of the sixth lens 760 is a convex surface, wherein at least one of the object side surface 761 and the image side surface 762 of the sixth lens 760 is an aspherical surface. In the seventh embodiment, both the object side surface 761 and the image side surface 762 of the sixth lens 760 are aspherical surfaces. The sixth lens 760 is a filter lens made of plastic material. The sixth lens 760 includes the visible light absorbing component, whereby the sixth lens 760 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the sixth lens 760 correspondingly transmits light in a wavelength range greater than 800nm.

[0291] The seventh lens 770 is a convex-concave lens with negative refractive power, which means that the object-side surface 771 of the seventh lens 770 is a convex surface, and the image-side surface 772 of the seventh lens 770 is a concave surface, wherein at least one of the object-side surface 771 and the image-side surface 772 of the seventh lens 770 is an aspherical surface. In the seventh embodiment, both the object-side surface 771 and the image-side surface 772 of the seventh lens 770 are aspherical surfaces. The seventh lens 770 is a filter lens made of plastic material. The seventh lens 770 includes the visible light absorption component, whereby the seventh lens 770 correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the seventh lens 770 correspondingly transmits light in a wavelength range greater than 800nm.

[0292] The equation for the above aspheric surface is:

[0293] z=ch 2 / [1+[1-(k+1)c 2 h 2 ] 0.5 ]+A4h 4 +A6h 6 +A8h 8 +A10h 10 +A12h 12 +A14h14 +A 16 h16+A18h 18 +A20

[0294] h 20 +…(1)

[0295] Wherein, z is the position value at a height of h along the optical axis Z direction with the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

[0296] In the seventh embodiment, the second lens 720 to the seventh lens 770 respectively satisfy the following conditions: |θ1|≤62°, |θ2|≤52°, |θ3|≤42°; wherein, the definitions of |θ1|, |θ2| and |θ3| are the same as those of the first embodiment, which will not be repeated here.

[0297] In addition, the second lens 720 to the seventh lens 770 respectively satisfy the following conditions: TWL50-TWL40≤30nm; in a preferred embodiment, TWL50-TWL40≤20nm; in another preferred embodiment, TWL50-TWL40≤10nm.

[0298] In addition, the second lens 720 to the seventh lens 770 respectively satisfy the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the lens, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0299] In addition, in the seventh embodiment, the first lens 710 satisfies the following conditions: 28°≤IRA100≤90°, wherein a maximum imaging height HOI is provided on the imaging surface 790, and IRA100 is an angle at which the lower ray of the light is incident on the object side surface 711 of the first lens 710 and corresponds to 1.0*HOI of the imaging surface 790; the seventh lens 770 satisfies the following conditions: 13°≤ERA70≤27°, wherein a maximum imaging height HOI is provided on the imaging surface 790, and ERA70 is an angle at which the main ray of the light is emitted from the image side surface 772 of the seventh lens 770 and corresponds to 0.70*HOI of the imaging surface 790.

[0300] The first lens 710 to the seventh lens 770 respectively satisfy the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the lens.

[0301] In addition, each of the second lens 720 to the seventh lens 770 has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm, wherein the material of the anti-reflection film includes magnesium fluoride (MgF2), silicon dioxide (SiO2), zinc sulfide (ZnS), titanium dioxide (TiO2), aluminum oxide (Al2O3) and silicon nitride (Si3N4), and the material of the anti-reflection film is selected to be able to interfere with the light waves reflected from the lens surface, thereby reducing reflection and increasing light transmittance.

[0302] The optical filter 780 is adjacent to the seventh lens 770. In a preferred embodiment, the optical filter 780 contains the visible light absorbing component so that the optical filter 780 also corresponds to absorbing visible light in the wavelength range between 400nm and 700nm, and the optical filter 780 corresponds to penetrating light in the wavelength range greater than 800nm.

[0303] In the seventh embodiment, a light-rejecting film is provided on the second lens 720 to the seventh lens 770 and / or the filter 780 , and the light-rejecting film absorbs light with a wavelength range greater than 900 nm.

[0304] The filter 780 satisfies the following condition: |TA50-TA0|≤10%, wherein when the wavelength range of the light is greater than 800nm ​​and penetrates the filter 780, TA50 is the transmittance of the light at an incident angle of 50 degrees, and TA0 is the transmittance of the light at an incident angle of 0 degrees.

[0305] The filter 780 satisfies the following condition: 13°≤ERA70≤27°, wherein there is a maximum imaging height HOI on the imaging surface 790 , and ERA70 is the angle at which the main light ray of the light is emitted from the image side surface 782 of the filter 780 and corresponds to 0.70*HOI of the imaging surface 790 .

[0306] In addition, the optical filter 780 satisfies the following condition: 0.1 mm≤CT≤1.0 mm, where CT is the center thickness of the optical filter 780 .

[0307] In a preferred embodiment, the optical filter 780 has the anti-reflection film, and the anti-reflection film corresponds to the light with a penetration wavelength range greater than 800 nm.

[0308] Please refer to Table 26 and Table 27 below.

[0309]

[0310]

[0311]

[0312]

[0313] Table 26 Fig.26 Detailed structural data of the seventh embodiment, wherein the units of the curvature radius, thickness, distance, focal length and maximum effective radius are in mm, and surfaces 0-18 represent the surfaces from the object side to the image side in sequence. Table 26 is the aspheric surface data of the seventh embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A4-A20 represents the 4th-20th order aspheric surface coefficients of each surface.

[0314] According to the data in Table 26, the angle data of the normal vectors of the positions on the control points at 0.50*L, 0.70*L and 0.95*L on the object side and image side of the second lens 720 to the seventh lens 770 and the optical axis Z are further obtained as shown in Table 28 below, and the angle of the lower ray of the light incident on the object side of the first lens 710 and corresponding to 1.0*HOI of the imaging surface 790, and the angle of the main ray of the light emitted from the image side surface 772 of the seventh lens 770 and the filter 780 and corresponding to 0.70*HOI of the imaging surface 790 are obtained, and the data are shown in Table 29 below.

[0315]

[0316]

[0317]

[0318] To summarize the above-mentioned first to seventh embodiments, at least one lens or more than one lens in the optical imaging system contains a visible light absorbing component, and the planar filter may also contain the visible light absorbing component, wherein the optical imaging system is capable of directly performing wavefront modulation and imaging on infrared rays, so that the optical imaging system has the characteristics of absorbing visible light and having high transmittance infrared light, and can be applied to various infrared optical systems, thereby improving the light collecting efficiency of the system and enhancing the work quality.

[0319] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An optical imaging system, comprising: At least one lens has a refractive power, at least one of the object side surface and the image side surface of the lens is an aspherical surface, wherein the lens comprises at least one visible light absorbing component, the lens correspondingly absorbs visible light in a wavelength range of 400nm to 700nm, and the lens correspondingly transmits light in a wavelength range greater than 800nm; and A filter is adjacent to the lens.

2. The optical imaging system of claim 1, wherein the lens satisfies the following condition: |θ1|≤62°, wherein, One of the object side surface and the image side surface of the lens forms an intersection with the optical axis, and the intersection is a starting point to define a vertical height L from the optical axis to the maximum effective radius, wherein the lens has an outer peripheral surface on both sides, and the lens is defined with an imaginary line that passes through the endpoints of the two outer peripheral surfaces and is perpendicular to the optical axis, and the imaginary line intersects at the maximum boundary point of one of the object side surface and the image side surface, whereby the maximum effective radius is defined as the intersection of the imaginary line and the maximum boundary point of the object side surface, or the intersection of the imaginary line and the maximum boundary point of the image side surface, wherein a1 point is defined on the object side surface or the image side surface, which is a position at a vertical height of 0.95*L from the optical axis corresponding to the intersection, and the a1 point has a reference line and a normal vector, the reference line passes through the a1 point and is correspondingly parallel to the optical axis, the normal vector passes through the a1 point and is correspondingly perpendicular to the object side surface or the image side surface, and the intersection angle formed between the reference line and the normal vector is θ1.

3. The optical imaging system of claim 2, wherein the lens has a horizontal contour surface around the object side surface and the image side surface respectively, the two horizontal contour surfaces respectively connect the endpoints of the two peripheral surfaces and the maximum boundary point of the object side surface and the maximum boundary point of the image side surface, and the imaginary line passes through the two peripheral surfaces by overlapping the horizontal contour surfaces.

4. The optical imaging system of claim 1, wherein the lens satisfies the following condition: |θ1|≤62°, wherein, One of the object side surface and the image side surface of the lens forms an intersection with the optical axis, and the intersection is a starting point to define a vertical height L from the optical axis to the maximum effective radius, wherein the lens has an optically effective area and an optically invalid area, and the optically invalid area surrounds the optically effective area, and the maximum effective radius is defined as the maximum turning boundary point between the optically effective area and the optically invalid area, wherein a point a1 is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.95*L from the optical axis from the intersection, and the point a1 has a reference line and a normal vector, the reference line passes through the point a1 and is correspondingly parallel to the optical axis, the normal vector passes through the point a1 and is correspondingly perpendicular to the object side surface or the image side surface, and the intersection angle formed between the reference line and the normal vector is θ1.

5. The optical imaging system of claim 1, wherein the lens satisfies the following condition: |θ2|≤52°, wherein, One of the object side surface and the image side surface of the lens forms an intersection with the optical axis, and the intersection is a starting point to define a vertical height L from the optical axis to the maximum effective radius, wherein the lens has an outer peripheral surface on both sides, and the lens is defined with an imaginary line that passes through the endpoints of the two outer peripheral surfaces and is perpendicular to the optical axis, and the imaginary line intersects at the maximum boundary point of one of the object side surface and the image side surface, whereby the maximum effective radius is defined as the intersection of the imaginary line and the maximum boundary point of the object side surface, or the intersection of the imaginary line and the maximum boundary point of the image side surface, wherein a2 point is defined on the object side surface or the image side surface, which is a position at a vertical height of 0.70*L from the optical axis corresponding to the intersection, and the a2 point has a reference line and a normal vector, the reference line passes through the a2 point and is correspondingly parallel to the optical axis, the normal vector passes through the a2 point and is correspondingly perpendicular to the object side surface or the image side surface, and the intersection angle formed between the reference line and the normal vector is θ2.

6. The optical imaging system of claim 5, wherein the lens has a horizontal contour surface around the object side surface and the image side surface respectively, the two horizontal contour surfaces respectively connect the endpoints of the two peripheral surfaces and the maximum boundary point of the object side surface and the maximum boundary point of the image side surface, and the imaginary line passes through the two peripheral surfaces by overlapping the horizontal contour surfaces.

7. The optical imaging system of claim 1, wherein the lens satisfies the following condition: |θ2|≤52°, wherein, One of the object side surface and the image side surface of the lens forms an intersection with the optical axis, and the intersection is a starting point to a maximum effective radius with a vertical height L from the optical axis, wherein the lens has an optically effective area and an optically invalid area, and the optically invalid area surrounds the optically effective area, and the maximum effective radius is defined as the maximum turning boundary point between the optically effective area and the optically invalid area, wherein a2 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.70*L from the optical axis from the intersection, and the a2 point has a reference line and a normal vector, the reference line passes through the a2 point and is correspondingly parallel to the optical axis, the normal vector passes through the a2 point and is correspondingly perpendicular to the object side surface or the image side surface, and the intersection angle formed between the reference line and the normal vector is θ2.

8. The optical imaging system of claim 1, wherein the lens satisfies the following condition: |θ3|≤42°, wherein, One of the object side surface and the image side surface of the lens forms an intersection with the optical axis, and the intersection is a starting point to a maximum effective radius with a vertical height L from the optical axis, wherein the two sides of the lens respectively have an outer peripheral surface, and the lens is defined with an imaginary line that passes through the endpoints of the two outer peripheral surfaces and is perpendicular to the optical axis, and the imaginary line intersects at the maximum boundary point of one of the object side surface and the image side surface, whereby the maximum effective radius is defined as the intersection of the imaginary line and the maximum boundary point of the object side surface, or the intersection of the imaginary line and the maximum boundary point of the image side surface, wherein a3 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.50*L from the optical axis from the intersection, and the a3 point has a reference line and a normal vector, the reference line passes through the a3 point and is correspondingly parallel to the optical axis, the normal vector passes through the a3 point and is correspondingly perpendicular to the object side surface or the image side surface, and an intersection angle θ3 is formed between the reference line and the normal vector.

9. The optical imaging system of claim 8, wherein the lens has a horizontal contour surface around the object side surface and the image side surface respectively, the two horizontal contour surfaces respectively connect the endpoints of the two peripheral surfaces and the maximum boundary point of the object side surface and the maximum boundary point of the image side surface, and the imaginary line passes through the two peripheral surfaces by overlapping the horizontal contour surfaces.

10. The optical imaging system of claim 1, wherein the lens satisfies the following condition: |θ3|≤42°, wherein, One of the object side surface and the image side surface of the lens forms an intersection with the optical axis, and the intersection is a starting point to a maximum effective radius with a vertical height L from the optical axis, wherein the lens has an optically effective area and an optically invalid area, and the optically invalid area surrounds the optically effective area, and the maximum effective radius is defined as the maximum turning boundary point between the optically effective area and the optically invalid area, wherein a3 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.50*L from the optical axis from the intersection, and the a3 point has a reference line and a normal vector, the reference line passes through the a3 point and is correspondingly parallel to the optical axis, the normal vector passes through the a3 point and is correspondingly perpendicular to the object side surface or the image side surface, and an intersection angle θ3 is formed between the reference line and the normal vector.

11. The optical imaging system of claim 1, wherein the lens satisfies the following condition: TWL50-TWL40≤30nm, wherein, TWL40 is the wavelength of light showing a transmittance of 40% in the transmittance curve of the lens, and TWL50 is the wavelength of light showing a transmittance of 50% in the transmittance curve of the lens.

12. The optical imaging system of claim 1, wherein the lens satisfies the following condition: 13°≤ERA70≤30°, wherein, The optical imaging system has an imaging surface located on one side of the filter, and a maximum imaging height HOI on the imaging surface. ERA70 is the angle at which the main light ray of the light is emitted from the image side surface of the lens and corresponds to 0.70*HOI of the imaging surface.

13. The optical imaging system of claim 1, wherein the lens satisfies the following condition: 28°≤IRA100≤90°, wherein: The optical imaging system has an imaging surface located on one side of the filter, and a maximum imaging height HOI on the imaging surface, and IRA100 is the angle at which the lower ray of the light is incident on the object side of the lens and corresponds to 1.0*HOI of the imaging surface.

14. The optical imaging system of claim 1, wherein the lens satisfies the following condition: 0.1 mm ≤ CT ≤ 1.0 mm, wherein: CT is the center thickness of the lens. 15 . The optical imaging system as claimed in claim 1 , wherein the filter is located adjacent to any position of the object side surface and the image side surface of the lens, and the lens is made of plastic.

16. The optical imaging system as claimed in claim 1, wherein the lens has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 800nm.

17. The optical imaging system as claimed in claim 1, wherein the lens and / or the filter has a light filter film, and the light filter film absorbs light with a wavelength range greater than 980nm.

18. The optical imaging system as claimed in claim 1, further comprising an image sensing module, wherein the optical imaging system has an imaging surface, and the image sensing module is correspondingly located at a position of the imaging surface.

19. An optical imaging system, comprising: at least one lens; and A filter is adjacent to the lens, the filter comprises at least one visible light absorbing component, the filter absorbs visible light with a wavelength range of 400nm to 700nm, and the filter transmits light with a wavelength range greater than 800nm.

20. The optical imaging system of claim 19, wherein the filter satisfies the following condition: |TA50-TA0|≤10%, wherein, When the wavelength range of the light is greater than 800 nm and penetrates the filter, TA50 is the transmittance when the incident angle of the light is 50 degrees, and TA0 is the transmittance when the incident angle of the light is 0 degrees.

21. The optical imaging system of claim 19, wherein the filter satisfies the following condition: 13°≤ERA70≤27°, wherein: The optical imaging system has an imaging surface located on one side of the filter, and a maximum imaging height HOI on the imaging surface. ERA70 is the angle at which the main light ray of the light is emitted from the image side of the filter and corresponds to 0.70*HOI of the imaging surface.

22. The optical imaging system of claim 19, wherein the filter satisfies the following condition: 0.1 mm ≤ CT ≤ 1.0 mm, wherein: CT is the center thickness of the filter.

23. The optical imaging system as claimed in claim 19, wherein the filter is located adjacent to any position of the object side and the image side of the lens, and the filter is made of plastic.

24. The optical imaging system as claimed in claim 19, wherein the filter has an anti-reflection film, and the anti-reflection film corresponds to the light with a transmission wavelength range greater than 800nm.

25. The optical imaging system as claimed in claim 19, wherein the lens and / or the filter has a light rejection film, and the light rejection film absorbs light with a wavelength range greater than 980 nm.

26. The optical imaging system as claimed in claim 21, further comprising an image sensing module, wherein the image sensing module is correspondingly located at a position of the imaging plane.

27. An optical imaging system, comprising: A plurality of lenses each have a refractive power, at least one of the plurality of lenses is a filter lens, the filter lens comprises at least one visible light absorbing component, the filter lens correspondingly absorbs visible light in a wavelength range between 400nm and 700nm, and the filter lens correspondingly transmits light in a wavelength range greater than 800nm.

28. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |θ1|≤62°, wherein, One of the object side surface and the image side surface of the filter lens forms an intersection with the optical axis, and the intersection is a vertical height L from the optical axis defined from the starting point to the maximum effective radius, wherein the filter lens has an outer peripheral surface on both sides respectively, and the filter lens is defined with an imaginary line passing through the end points of the two outer peripheral surfaces and being perpendicular to the optical axis, and the imaginary line correspondingly intersects at the maximum boundary point of one of the object side surface and the image side surface, whereby the maximum effective radius is defined as the intersection of the imaginary line and the maximum boundary point of the object side surface, or the intersection of the imaginary line and the maximum boundary point of the image side surface, wherein a1 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.95*L from the optical axis from the intersection point, and the a1 point has a normal vector, and the intersection angle between the normal vector and the optical axis is θ1.

29. The optical imaging system of claim 28, wherein the filter lens has a horizontal contour surface around the object side surface and the image side surface respectively, the two horizontal contour surfaces respectively connect the endpoints of the two peripheral surfaces and the maximum boundary point of the object side surface and the maximum boundary point of the image side surface, and the imaginary line passes through the two peripheral surfaces by overlapping the horizontal contour surfaces.

30. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |θ1|≤62°, wherein, One of the object side surface and the image side surface of the filter lens forms an intersection with the optical axis, and the intersection is a starting point to define a vertical height L from the optical axis to the maximum effective radius, wherein the filter lens has an optically effective area and an optically invalid area, and the optically invalid area surrounds the optically effective area, and the maximum effective radius is defined as the maximum turning boundary point between the optically effective area and the optically invalid area, wherein a point a1 is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.95*L from the optical axis from the intersection, and the point a1 has a normal vector, and the intersection angle between the normal vector and the optical axis is θ1.

31. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |θ2|≤52°, wherein, One of the object side surface and the image side surface of the filter lens forms an intersection with the optical axis, and the intersection is a vertical height L from the optical axis defined from the starting point to the maximum effective radius, wherein the filter lens has an outer peripheral surface on both sides, and the filter lens is defined with an imaginary line passing through the endpoints of the two outer peripheral surfaces and being perpendicular to the optical axis, and the imaginary line correspondingly intersects at the maximum boundary point of one of the object side surface and the image side surface, whereby the maximum effective radius is defined as the intersection of the imaginary line and the maximum boundary point of the object side surface, or the intersection of the imaginary line and the maximum boundary point of the image side surface, wherein a2 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.70*L from the optical axis from the intersection, and the a2 point has a normal vector, and the intersection angle between the normal vector and the optical axis is θ2.

32. An optical imaging system as described in claim 31, wherein the filter lens has a horizontal contour surface around the object side and the image side, respectively, the two horizontal contour surfaces respectively connect the endpoints of the two outer peripheral surfaces and the maximum boundary point of the object side and the maximum boundary point of the image side, and the imaginary line passes through the two outer peripheral surfaces by overlapping each of the horizontal contour surfaces.

33. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |θ2|≤52°, wherein, One of the object side surface and the image side surface of the filter lens forms an intersection with the optical axis, and the intersection is a starting point to a maximum effective radius with a vertical height L from the optical axis, wherein the filter lens has an optically effective area and an optically invalid area, and the optically invalid area surrounds the optically effective area, and the maximum effective radius is defined as the maximum turning boundary point between the optically effective area and the optically invalid area, wherein a2 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.70*L from the optical axis from the intersection, and the a2 point has a normal vector, and the intersection angle between the normal vector and the optical axis is θ2.

34. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |θ3|≤42°, wherein, One of the object side surface and the image side surface of the filter lens forms an intersection with the optical axis, and the intersection is a vertical height L from the starting point to the maximum effective radius from the optical axis, wherein the filter lens has an outer peripheral surface on both sides, and the filter lens is defined with an imaginary line passing through the end points of the two outer peripheral surfaces and being perpendicular to the optical axis, and the imaginary line correspondingly intersects at the maximum boundary point of one of the object side surface and the image side surface, whereby the maximum effective radius is defined as the intersection of the imaginary line and the maximum boundary point of the object side surface, or the intersection of the imaginary line and the maximum boundary point of the image side surface, wherein a3 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.50*L from the optical axis from the intersection point, and the a3 point has a normal vector, and the intersection angle between the normal vector and the optical axis is θ3.

35. An optical imaging system as described in claim 34, wherein the filter lens has a horizontal contour surface around the object side and the image side, respectively, the two horizontal contour surfaces respectively connect the endpoints of the two outer peripheral surfaces and the maximum boundary point of the object side and the maximum boundary point of the image side, and the imaginary line passes through the two outer peripheral surfaces by overlapping each of the horizontal contour surfaces.

36. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |θ3|≤42°, wherein, One of the object side surface and the image side surface of the filter lens forms an intersection with the optical axis, and the intersection is a starting point to a maximum effective radius with a vertical height L from the optical axis, wherein the filter lens has an optically effective area and an optically invalid area, and the optically invalid area surrounds the optically effective area, and the maximum effective radius is defined as the maximum turning boundary point between the optically effective area and the optically invalid area, wherein a3 point is defined on the object side surface or the image side surface, which is a position corresponding to a vertical height of 0.50*L from the optical axis from the intersection, and the a3 point has a normal vector, and the intersection angle between the normal vector and the optical axis is θ3.

37. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: |TA50-TA0|≤10%, wherein, When the wavelength range of the light is greater than 800 nm and penetrates the filter lens, TA50 is the transmittance when the incident angle of the light is 50 degrees, and TA0 is the transmittance when the incident angle of the light is 0 degrees.

38. The optical imaging system of claim 27, wherein the filter lens satisfies the following condition: 0.1 mm ≤ CT ≤ 1.0 mm, wherein: CT is the center thickness of the filter lens, and the filter lens is made of plastic.

39. The optical imaging system of claim 27, wherein the filter lens has an anti-reflection film, and the anti-reflection film corresponds to the light with a wavelength range greater than 980nm.

40. The optical imaging system as claimed in claim 27, further comprising an image sensing module, the optical imaging system having an imaging surface, the image sensing module being correspondingly located at a position of the imaging surface.

Images