Optical lens, projection module and electronic device

Abstract

The application discloses an optical lens, a projection module and electronic equipment, the optical lens has five lenses with refractive power in common, the five lenses are sequentially arranged along an optical axis from an imaging side to an image source side, the first lens, the second lens, the fourth lens and the fifth lens have positive refractive power, the image source side surface of the first lens is a convex surface at a near optical axis; the imaging side surface and the image source side surface of the second lens are a convex surface and a concave surface respectively at the near optical axis; the third lens has negative refractive power, the imaging side surface and the image source side surface of the third lens are concave surfaces at the near optical axis; the image source side surface of the fourth lens is a convex surface at the near optical axis; the imaging side surface of the fifth lens is a convex surface at the near optical axis; the optical lens satisfies the following relationship: 5.3mm < f*tan(FOV) < 5.6mm. The optical lens, the projection module and the electronic equipment provided by the application can realize the light and thin, small and compact design of the optical lens, and improve the projection imaging quality of the optical lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging, in particular to an optical lens, a projection module and an electronic device. BACKGROUND

[0002] In an augmented reality (AR) device and a virtual reality (VR) device, an optical lens is an indispensable part, and with the development of augmented reality technology and virtual reality technology, miniaturization and super-clearness gradually become the development trend of optical lenses. However, in the related art, it is difficult to meet the design trend of light, thin, and small optical lenses while achieving high-quality projection imaging of the optical lenses. SUMMARY

[0003] The embodiments of the present application disclose an optical lens, a projection module and an electronic device, which can realize light, thin, and small design of the optical lens while improving the projection imaging quality of the optical lens.

[0004] In order to achieve the above purpose, in a first aspect, the present application discloses an optical lens, the optical lens has five lenses with refractive power in total, the five lenses are sequentially arranged along the optical axis from the imaging side to the image source side as a first lens, a second lens, a third lens, a fourth lens and a fifth lens;

[0005] The first lens has positive refractive power, and the image source side surface of the first lens is convex at the near optical axis;

[0006] The second lens has positive refractive power, the imaging side surface of the second lens is convex at the near optical axis, and the image source side surface of the second lens is concave at the near optical axis;

[0007] The third lens has negative refractive power, the imaging side surface of the third lens is concave at the near optical axis, and the image source side surface of the third lens is concave at the near optical axis;

[0008] The fourth lens has positive refractive power, and the image source side surface of the fourth lens is convex at the near optical axis;

[0009] The fifth lens has positive refractive power, and the imaging side surface of the fifth lens is convex at the near optical axis;

[0010] The optical lens satisfies the following relationship: 5.3mm < f*tan(FOV) < 5.6mm;

[0011] Wherein, f is the focal length of the optical lens, and FOV is the maximum field of view angle of the optical lens.

[0012] In the optical lens provided in the application, the first lens has positive refractive power, and the image source side surface of the first lens is convex at the near optical axis, which is conducive to converging light and projecting an image onto an imaging surface; the second lens has positive refractive power, and the imaging side surface of the second lens is convex at the near optical axis, and the image source side surface of the second lens is concave at the near optical axis, the second lens and the first lens cooperate with each other, which is conducive to reducing the refractive power burden of the second lens, preventing the second lens from being too curved, and reducing the processing difficulty of the second lens; the third lens has negative refractive power, and the imaging side surface and the image source side surface of the third lens are both designed to be concave at the near optical axis, which is used for diverging a concentrated light beam and is conducive to correcting aberration of the optical lens and improving imaging quality; the fourth lens has positive refractive power, and the image source side surface of the fourth lens is convex at the near optical axis, which is conducive to assisting the fifth lens in converging light and correcting part of the aberration generated by the fifth lens; the fifth lens has positive refractive power, and the imaging side surface of the fifth lens is designed to be convex at the near optical axis, which is conducive to balancing the surface configuration of the image source side surface of the fifth lens and enhancing the light converging ability of the fifth lens.

[0013] In addition, the optical lens satisfies the relationship: 5.3mm < f*tan(FOV) < 5.6mm. Wherein, f is the focal length of the optical lens, and FOV is the maximum field of view angle of the optical lens. When the above relationship is satisfied, it is conducive to balancing the focal length of the optical lens and the field of view angle of the optical lens, conducive to controlling the total optical length of the optical lens, realizing the miniaturization design of the optical lens, and improving the distortion of the edge field of view of the optical lens, and at the same time, it is also conducive to limiting the size of the optical lens in the direction perpendicular to the optical axis and the size of the image source surface of the image display element, to further realize the miniaturization design of the projection module and the electronic equipment with projection function, such as being applicable to AR / VR glasses, reducing the diameter of the frame of the AR / VR glasses, so as to be worn by the user. When the upper limit of the above relationship is exceeded, the focal length of the optical lens is too large, which leads to the volume of the optical lens being too large, which is not conducive to miniaturization design, or the field of view angle of the optical lens is too large, the distortion of the edge field of view of the optical lens is too large, which is not conducive to realizing high-quality projection imaging. When the lower limit of the above relationship is exceeded, the focal length of the optical lens is too small, which is easy to increase the production process difficulty of the optical lens, which is not conducive to reducing the production cost, or the field of view angle of the optical lens is too small, which reduces the field of view range of the optical lens, leading to incomplete imaging information of the optical lens, affecting the projection quality.

[0014] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 0.29 < ImgH / TTL < 0.31. Wherein, TTL is the distance from the imaging side surface of the first lens to the image source plane of the optical lens on the optical axis, that is, the total optical length of the optical lens, and ImgH is the image source height corresponding to the maximum field of view angle of the optical lens. When the above relationship is satisfied, it is beneficial to balance the size of the image source plane of the optical lens and the total optical length of the optical lens, so that the structure of the optical lens is more compact, the miniaturization design is realized, it is also beneficial to reduce the telecentricity of the optical lens, improve the telecentricity characteristics of the optical lens, in order to improve the depth of field of the optical lens, it is beneficial to improve the uniformity of the optical lens, and meet the requirements of high-quality projection imaging. When the upper limit of the above relationship is exceeded, the volume of the optical lens is too large, resulting in high production cost of the optical lens, and when the lower limit of the above relationship is exceeded, the telecentricity of the optical lens is too large, which easily affects the uniformity and projection quality of the optical lens.

[0015] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 30° < FOV < 35°. Wherein, FOV is the maximum field of view angle of the optical lens. When the above relationship is satisfied, it is beneficial to control the field of view angle of the optical lens within a reasonable range, in order to improve the distortion of the edge field of view of the optical lens. When the upper limit of the above relationship is exceeded, it is easy to make the field of view angle of the optical lens too large, resulting in too large distortion of the edge field of view of the optical lens, and the image periphery appears twisted phenomenon, and when the lower limit of the above relationship is exceeded, it is easy to make the field of view angle of the optical lens too small, which reduces the field of view range of the optical lens, resulting in incomplete imaging information of the optical lens, and affects the imaging quality of the optical lens.

[0016] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 0.31mm 2 <T45*f*tan(FOV) < 0.34mm 2 . Wherein, T45 is the air gap of the fourth lens and the fifth lens on the optical axis. When the above relationship is satisfied, it is beneficial to limit the air gap of the fourth lens and the fifth lens on the optical axis, shorten the total optical length of the optical lens, realize the miniaturization design of the optical lens, and at the same time avoid the distance between the fourth lens and the fifth lens being too small to cause interference between the fourth lens and the fifth lens, which easily increases the assembly difficulty and risk of the optical lens.

[0017] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 0.6 < f4 / f < 0.8. Wherein, f4 is the focal length of the fourth lens. When the above relationship is satisfied, it is beneficial to reasonably allocate the refractive power contribution of the fourth lens, prevent the refractive power of the fourth lens from being too strong to cause the surface of the fourth lens to be too curved, reduce the tolerance sensitivity of the optical lens, and prevent the refractive power of the fourth lens from being too weak to increase the pressure on the remaining lenses to correct aberrations, thereby ensuring the projection imaging quality of the optical lens.

[0018] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 4 < f1 / f + f2 / f < 8. Wherein, f1 is the focal length of the first lens, and f2 is the focal length of the second lens. When the above relationship is satisfied, it is beneficial to reasonably allocate the refractive power of the first lens and the second lens, prevent the refractive power of the combination of the first lens and the second lens from being too concentrated to cause the first lens and the second lens to be too curved, or the refractive power of the first lens and the second lens to be too weak to be not conducive to the correction of aberrations of the optical lens, thereby ensuring the projection imaging quality of the optical lens.

[0019] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 2 < f2 / f < 6. Wherein, f2 is the focal length of the second lens. When the above relationship is satisfied, it is beneficial to reasonably allocate the refractive power contribution of the second lens, prevent the refractive power of the second lens from being too strong to cause the surface of the second lens to be too curved, reduce the tolerance sensitivity of the optical lens, and prevent the refractive power of the second lens from being too weak to be not conducive to the correction of aberrations of the optical lens, thereby ensuring the projection imaging quality of the optical lens.

[0020] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: -3 < R2 / f < -1. Wherein, R2 is the curvature radius of the image source side surface of the first lens at the optical axis. When the above relationship is satisfied, it is beneficial to limit the refractive power of the first lens, avoid the refractive power of the first lens from being too strong to cause the surface of the first lens to be too curved and the processing difficulty of the first lens to increase, or avoid the refractive power of the first lens from being too weak to cause the focal length of the first lens to be too long, make the optical lens structure compact, and thereby facilitate the miniaturization design of the optical lens.

[0021] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: |R1 / R2|>1.5. Wherein, R1 is the radius of curvature of the imaging side surface of the first lens at the optical axis, and R2 is the radius of curvature of the image source side surface of the first lens at the optical axis. When the above relationship is satisfied, it is beneficial to balance the radii of curvature of the imaging side surface and the image source side surface of the first lens, avoiding the difference between the radii of curvature of the imaging side surface and the image source side surface of the first lens being too large, thereby increasing the processing difficulty of the first lens.

[0022] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 0.9<R3 / R4<1.1. Wherein, R3 is the radius of curvature of the imaging side surface of the second lens at the optical axis, and R4 is the radius of curvature of the image source side surface of the second lens at the optical axis. When the above relationship is satisfied, it is beneficial to balance the radii of curvature of the imaging side surface and the image source side surface of the second lens, avoiding the difference between the radii of curvature of the imaging side surface and the image source side surface of the second lens being too large, thereby increasing the processing difficulty of the second lens.

[0023] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 0.4<CT1 / (CT2+CT3)<0.6. Wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. When the above relationship is satisfied, the thickness of the first lens, the second lens and the third lens on the optical axis can be controlled within a suitable range, avoiding the thickness of a single lens being too large or too small, thereby avoiding the difficulty of processing.

[0024] As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the relationship: 11<f2 / CT2<40. Wherein, f2 is the focal length of the second lens, and CT2 is the thickness of the second lens on the optical axis. When the above relationship is satisfied, it is beneficial to limit the surface shape of the second lens, avoiding the surface of the second lens being too curved to affect the sensitivity of the optical lens, thereby being beneficial to ensure the yield of the production and processing of the optical lens, and avoiding the surface of the second lens being too flat to cause the focal length of the second lens being too long, thereby being beneficial to balance the distribution of the refractive power of each lens of the optical lens, and being beneficial to make the structure of the optical lens compact, realizing the miniaturization design of the optical lens.

[0025] As an optional implementation, in the embodiment of the first aspect, the optical lens satisfies a relationship: 0.48 < TD / TTL < 0.5. Wherein, TD is a distance on the optical axis from an imaging side surface of the first lens to an image source side surface of the fifth lens, and TTL is a distance on the optical axis from the imaging side surface of the first lens to an image source surface of the optical lens. When the above relationship is satisfied, the overall length of the optical lens can be avoided to be too long or too short, which is beneficial to realize the miniaturization design of the optical lens, and meanwhile, the manufacturing difficulty of the optical lens is controlled, and a balance is achieved between the miniaturization design of the optical lens and the manufacturing difficulty of the optical lens.

[0026] As an optional implementation, in the embodiment of the first aspect, the optical lens satisfies a relationship: 0.6 < SD11 / SD51 < 0.8. Wherein, SD11 is an effective half aperture of the imaging side surface of the first lens, and SD51 is an effective half aperture of the imaging side surface of the fifth lens. When the above relationship is satisfied, the effective half apertures of the imaging side surfaces of the first lens and the fifth lens are limited, which is beneficial to avoid the aperture difference between the two sides of the optical lens to be too large, beneficial to keep the center balance of the optical lens, and also beneficial to the installation of the optical lens.

[0027] As an optional implementation, in the embodiment of the first aspect, the optical lens satisfies a relationship: 0.8 < SD21 / SD42 < 0.9. Wherein, SD21 is an effective half aperture of the imaging side surface of the second lens, and SD42 is an effective half aperture of the image source side surface of the fourth lens. When the above relationship is satisfied, the effective half apertures of the imaging side surfaces of the second lens and the fourth lens are limited, which is beneficial to avoid the difference between the effective half aperture of the imaging side surface of the second lens and the effective half aperture of the image source side surface of the fourth lens to be too large and cause assembly difficulty, beneficial to make the overall structure of the optical lens more balanced, and ensure the assembly stability of the optical lens.

[0028] In a second aspect, the present application discloses a projection module, which comprises an image display element and the optical lens as described in the first aspect. The image display element is arranged on the image source side of the optical lens. The projection module with the optical lens can effectively control the total optical length of the optical lens, realize the light and thin miniaturization design of the optical lens, improve the distortion of the edge field of view of the optical lens, and improve the projection imaging quality of the optical lens.

[0029] In a third aspect, the present application further discloses an electronic device, which comprises a shell and the projection module as described in the second aspect. The projection module is arranged in the shell. The electronic device with the projection module can effectively control the total optical length of the optical lens, realize the light and thin miniaturization design of the optical lens, improve the distortion of the edge field of view of the optical lens, and improve the projection imaging quality of the optical lens.

[0030] Compared with the prior art, the present application has the beneficial effects that:

[0031] The optical lens, the projection module and the electronic equipment provided by the embodiments of the present application adopt five lenses, the refractive power and the surface shape of the five lenses are designed, and at the same time, the optical lens satisfies the relationship: 5.4<f*tan(HFOV)<5.6, so as to balance the focal length and the field of view angle of the optical lens, thereby being beneficial to control the total optical length of the optical lens, realize the light and thin and small design of the optical lens, improve the distortion of the edge field of view of the optical lens, improve the projection imaging quality of the optical lens, and at the same time, be beneficial to limit the size of the optical lens in the direction perpendicular to the optical axis and the size of the image source surface of the image display element, so as to further realize the small design of the projection module and the electronic equipment with the projection function, for example, which can be applied to AR / VR glasses, reduce the diameter of the frame of the AR / VR glasses, and be convenient for the user to wear. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a structure schematic diagram of the projection module provided by the first embodiment of the present application and provided with the optical lens;

[0034] Figure 2 is a longitudinal spherical aberration diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the first embodiment of the present application;

[0035] Figure 3 is an astigmatism curve diagram (mm) of the optical lens disclosed by the first embodiment of the present application;

[0036] Figure 4 is a structure schematic diagram of the projection module provided by the second embodiment of the present application and provided with the optical lens;

[0037] Figure 5 is a longitudinal spherical aberration diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed by the second embodiment of the present application;

[0038] Figure 6 is an astigmatism curve diagram (mm) of the optical lens disclosed by the second embodiment of the present application;

[0039] Figure 7 is a structure schematic diagram of the projection module provided by the third embodiment of the present application and provided with the optical lens;

[0040] Figure 8 is a longitudinal spherical aberration graph (mm) and a distortion curve graph (%) of the optical lens disclosed by the third embodiment of the present application;

[0041] Figure 9 is an astigmatism curve graph (mm) of the optical lens disclosed by the third embodiment of the present application;

[0042] Figure 10 is a structure schematic diagram of a projection module provided with an optical lens disclosed by the fourth embodiment of the present application;

[0043] Figure 11 is a longitudinal spherical aberration graph (mm) and a distortion curve graph (%) of the optical lens disclosed by the fourth embodiment of the present application;

[0044] Figure 12 is an astigmatism curve graph (mm) of the optical lens disclosed by the fourth embodiment of the present application;

[0045] Figure 13 is a structure schematic diagram of a projection module provided with an optical lens disclosed by the fifth embodiment of the present application;

[0046] Figure 14 is a longitudinal spherical aberration graph (mm) and a distortion curve graph (%) of the optical lens disclosed by the fifth embodiment of the present application;

[0047] Figure 15 is an astigmatism curve graph (mm) of the optical lens disclosed by the fifth embodiment of the present application;

[0048] Figure 16 is a structure schematic diagram of an electronic device provided by the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0050] Please refer to Figure 1 According to a first aspect of the present application, an optical lens 100 is disclosed, which has a total of five lenses with refractive power. The five lenses are sequentially arranged along the optical axis from the imaging side to the image source side as a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5. During projection, the image light beam enters the fifth lens L5, the fourth lens L4, the third lens L3, the second lens L2 and the first lens L1 in sequence from the image source of the fifth lens L5, and is projected and imaged on the imaging component on the imaging side.

[0051] The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has positive refractive power. The imaging side surface S1 of the first lens L1 can be convex or concave at the near optical axis O, the image source side surface S2 of the first lens L1 can be convex at the near optical axis O, the imaging side surface S3 of the second lens L2 can be convex at the near optical axis O, the image source side surface S4 of the second lens L2 can be concave at the near optical axis O, the imaging side surface S5 of the third lens L3 can be concave at the near optical axis O, the image source side surface S6 of the third lens L3 can be concave at the near optical axis O, the imaging side surface S7 of the fourth lens L4 can be convex or concave at the near optical axis O, the image source side surface S8 of the fourth lens L4 can be convex at the near optical axis O, the imaging side surface S9 of the fifth lens L5 can be convex at the near optical axis O, and the image source side surface S10 of the fifth lens L5 can be convex or concave at the near optical axis O.

[0052] In the optical lens 100, the first lens L1 has positive refractive power, and the image source side surface S2 of the first lens L1 is convex at the near optical axis O, which is conducive to converging light and projecting an image onto an imaging surface; the second lens L2 has positive refractive power, and the imaging side surface S3 of the second lens L2 is convex at the near optical axis O, and the image source side surface S4 of the second lens L2 is concave at the near optical axis O, the second lens L2 and the first lens L1 cooperate with each other, which is conducive to reducing the refractive burden of the second lens L2, preventing the second lens L2 from being too curved, and reducing the processing difficulty of the second lens L2; the third lens L3 has negative refractive power, and the imaging side surface S5 and the image source side surface S6 of the third lens L3 are both concave at the near optical axis O, which is used for diverging the concentrated light beam and is conducive to correcting the aberration of the optical lens 100 and improving the imaging quality; the fourth lens L4 has positive refractive power, and the image source side surface S8 of the fourth lens L4 is convex at the near optical axis O, which is conducive to assisting the fifth lens L5 in converging light and correcting part of the aberration generated by the fifth lens L5; the fifth lens L5 has positive refractive power, and the imaging side surface S9 of the fifth lens L5 is convex at the near optical axis O, which is conducive to balancing the surface configuration of the image source side surface S10 of the fifth lens L5 and enhancing the light converging ability of the fifth lens L5.

[0053] In some embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 can be plastic, so that the optical lens 100 has good optical effect and good portability. In addition, the plastic material is easier to process the lens, so that the processing cost of the optical lens 100 can be reduced.

[0054] In some embodiments, the material of the lenses in the optical lens 100 can also be glass. The lenses made of glass can withstand higher or lower temperatures and have excellent optical effects and better stability.

[0055] In some embodiments, at least two lenses made of different materials can also be provided in the optical lens 100. For example, a combination of glass lenses and plastic lenses can be used, but the specific configuration relationship can be determined according to actual needs, which is not exhaustive here.

[0056] In some embodiments, the optical lens 100 further includes a stop 101, which can be an aperture stop or a field stop. The stop 101 can be provided between the imaging side of the optical lens 100 and the imaging side surface S1 of the first lens L1. It can be understood that in other embodiments, the stop 101 can also be provided between the image source side surface S4 of the second lens L2 and the imaging side surface S5 of the third lens L3, or the stop 101 can also be provided between the image source side surface S2 of the first lens L1 and the imaging side surface S3 of the second lens L2. The specific adjustment and setting can be adjusted according to actual conditions, and the present embodiment does not make specific limitations.

[0057] In some embodiments, the optical lens 100 satisfies the relationship: 0.29 < ImgH / TTL < 0.31. Wherein, TTL is the distance between the imaging side surface S1 of the first lens L1 and the image source surface 201 of the optical lens 100 on the optical axis O, that is, the total optical length of the optical lens 100, and ImgH is the image source height corresponding to the maximum field angle of the optical lens 100. Specifically, ImgH / TTL can be 0.291, 0.296, 0.297, 0.300, 0.301, 0.303, 0.305 or 0.308, etc. When the above relationship is satisfied, it is beneficial to balance the size of the image source surface 201 of the optical lens 100 and the total optical length of the optical lens 100, so that the structure of the optical lens 100 is more compact, realizing miniaturization design, and it is also beneficial to reduce the telecentricity of the optical lens 100, improve the telecentricity of the optical lens 100, and improve the depth of field of the optical lens 100, which is beneficial to improve the uniformity of the optical lens 100, and meet the requirements of high-quality projection imaging. When the upper limit of the above relationship is exceeded, the volume of the optical lens 100 is too large, resulting in high production cost of the optical lens 100, and when the lower limit of the above relationship is exceeded, the telecentricity of the optical lens 100 is too large, which easily affects the uniformity and projection quality of the optical lens 100.

[0058] In some embodiments, the optical lens 100 satisfies a relationship: 30° < FOV < 35°. Wherein, FOV is the maximum field of view angle of the optical lens 100. Specifically, FOV can be 30.5°, 31.6°, 32.1°, 33.3°, 34.47° or 34.897°. When the above relationship is satisfied, it is beneficial to control the field of view angle of the optical lens 100 within a reasonable range to improve the distortion of the edge field of view of the optical lens 100. When exceeding the upper limit of the above relationship, the field of view angle of the optical lens 100 is too large, which leads to too large distortion of the edge field of view of the optical lens 100, and the image periphery appears distorted. When falling below the lower limit of the above relationship, the field of view angle of the optical lens 100 is too small, which reduces the field of view range of the optical lens 100, resulting in incomplete imaging information of the optical lens 100, and affecting the imaging quality of the optical lens 100.

[0059] In some embodiments, the optical lens 100 satisfies a relationship: 5.3mm < f*tan(FOV) < 5.6mm. Wherein, f is the focal length of the optical lens 100, and FOV is the maximum field of view angle of the optical lens 100. Specifically, f*tan(FOV) can be 5.305mm, 5.328mm, 5.396mm, 5.41mm, 5.45mm, 5.52mm, 5.55mm or 5.59mm, etc. When the above relationship is satisfied, it is beneficial to balance the focal length of the optical lens 100 and the field of view angle of the optical lens 100, control the total optical length of the optical lens 100, realize the miniaturization design of the optical lens 100, and improve the distortion of the edge field of view of the optical lens 100. At the same time, it is also beneficial to limit the size of the optical lens 100 in the direction perpendicular to the optical axis O and the size of the image source surface 201 of the image display element, so as to further realize the miniaturization design of the projection module and the electronic device with projection function, which can be applied to AR / VR glasses, for example, to reduce the diameter of the frame of the AR / VR glasses for the user to wear. When exceeding the upper limit of the above relationship, the focal length of the optical lens 100 is too large, which leads to too large volume of the optical lens 100, which is not conducive to miniaturization design, or the field of view angle of the optical lens 100 is too large, which leads to too large distortion of the edge field of view of the optical lens 100, which is not conducive to realizing high-quality projection imaging. When falling below the lower limit of the above relationship, the focal length of the optical lens 100 is too small, which increases the production difficulty of the optical lens 100, which is not conducive to reducing production cost, or the field of view angle of the optical lens 100 is too small, which reduces the field of view range of the optical lens 100, resulting in incomplete imaging information of the optical lens 100, and affecting the projection quality.

[0060] In some embodiments, the optical lens 100 satisfies a relationship: 0.31mm < f*tan(FOV) < 0.34mm. 2 <T45*f*tan(FOV) < 0.34mm 2. Wherein, T45 is the air gap of the fourth lens L4 and the fifth lens L5 on the optical axis O, and FOV is the maximum field of view angle of the optical lens 100. Specifically, T45*f*tan(FOV) can be 0.312mm 2 , 0.318mm 2 , 0.325mm 2 , 0.330mm 2 , 0.336mm 2 or 0.339mm 2 etc. When the above relationship is satisfied, it is beneficial to limit the air gap of the fourth lens L4 and the fifth lens L5 on the optical axis O, shorten the total optical length of the optical lens 100, realize the miniaturization design of the optical lens 100, and at the same time avoid the distance between the fourth lens L4 and the fifth lens L5 being too small to cause interference between the fourth lens L4 and the fifth lens L5, which easily increases the assembly difficulty and risk of the optical lens 100.

[0061] In some embodiments, the optical lens 100 satisfies the relationship: 0.6

[0062] In some embodiments, the optical lens 100 satisfies the relationship: 4

[0063] In some embodiments, the optical lens 100 satisfies a relationship: 2 < f2 / f < 6. Wherein, f2 is the focal length of the second lens L2. Specifically, f2 / f can be 2.2, 2.8, 3.6, 4.4, 5.17, 5.80, 5.91 or 5.97, etc. When the above relationship is satisfied, it is beneficial to reasonably allocate the refractive power contribution of the second lens L2, prevent the surface of the second lens L2 from being too curved due to excessive refractive power of the second lens L2, reduce the tolerance sensitivity of the optical lens 100, and prevent the refractive power of the second lens L2 from being too weak to be beneficial to the correction of aberration of the optical lens 100, thereby benefiting the projection imaging quality of the optical lens 100.

[0064] In some embodiments, the optical lens 100 satisfies a relationship: -3 < R2 / f < -1. Wherein, R2 is the curvature radius of the image source side surface S2 of the first lens L1 at the optical axis O. Specifically, R2 / f can be -1.12, -1.24, -1.57, -2.08, -2.36, -2.84, -2.90 or -2.976, etc. When the above relationship is satisfied, it is beneficial to limit the refractive power of the first lens L1, avoid the surface of the first lens L1 being too curved due to excessive refractive power of the first lens L1, and avoid the focal length of the first lens L1 being too long due to insufficient refractive power of the first lens L1, thereby benefiting the compact structure of the optical lens 100, and facilitating the miniaturization design of the optical lens 100.

[0065] In some embodiments, the optical lens 100 satisfies a relationship: |R1 / R2| > 1.5. Wherein, R1 is the curvature radius of the imaging side surface S1 of the first lens L1 at the optical axis O, and R2 is the curvature radius of the image source side surface S2 of the first lens L1 at the optical axis O. Specifically, |R1 / R2| can be 1.51, 2.8, 3.5, 10.6, 15.8, 20.9, 25.66 or 33.87, etc. When the above relationship is satisfied, it is beneficial to balance the curvature radii of the imaging side surface S1 and the image source side surface S2 of the first lens L1, and avoid the machining difficulty of the first lens L1 being increased due to the excessive difference between the curvature radii of the imaging side surface S1 and the image source side surface S2 of the first lens L1.

[0066] In some embodiments, the optical lens 100 satisfies a relationship: 0.9 < R3 / R4 < 1.1. Wherein, R3 is a radius of curvature of the imaging side surface S3 of the second lens L2 at the optical axis O, and R4 is a radius of curvature of the image source side surface S4 of the second lens L2 at the optical axis O. Specifically, R3 / R4 can be 0.915, 0.957, 1.005, 1.037, 1.067, 1.089, or 1.097, etc. When the above relationship is satisfied, it is beneficial to balance the radii of curvature of the imaging side surface S3 and the image source side surface S4 of the second lens L2, avoiding the difference between the radii of curvature of the imaging side surface S3 and the image source side surface S4 of the second lens L2 being too large, thereby increasing the processing difficulty of the second lens L2.

[0067] In some embodiments, the optical lens 100 satisfies a relationship: 0.4 < CT1 / (CT2+CT3) < 0.6. Wherein, CT1 is a thickness of the first lens L1 on the optical axis O, CT2 is a thickness of the second lens L2 on the optical axis O, and CT3 is a thickness of the third lens L3 on the optical axis O. Specifically, CT1 / (CT2+CT3) can be 0.413, 0.476, 0.505, 0.535, 0.579, 0.591, or 0.598, etc. When the above relationship is satisfied, the thicknesses of the first lens L1, the second lens L2, and the third lens L3 on the optical axis O can be controlled within a suitable range, avoiding the thickness of a single lens being too large or too small, thereby avoiding the difficulty of processing.

[0068] In some embodiments, the optical lens 100 satisfies a relationship: 11 < f2 / CT2 < 40. Wherein, f2 is a focal length of the second lens L2, and CT2 is a thickness of the second lens L2 on the optical axis O. Specifically, f2 / CT2 can be 11.2, 12.8, 13.6, 17.0, 22.6, 29.0, 35.1, 37.7, 39.97, etc. When the above relationship is satisfied, it is beneficial to limit the surface shape of the second lens L2, avoiding the surface of the second lens L2 being too curved to affect the sensitivity of the optical lens 100, thereby benefiting the yield of the production and processing of the optical lens 100, and avoiding the surface of the second lens L2 being too flat to cause the focal length of the second lens L2 being too long, thereby balancing the distribution of refractive power of each lens of the optical lens 100, and benefiting the compact structure of the optical lens 100, achieving the miniaturization design of the optical lens 100.

[0069] In some embodiments, the optical lens 100 satisfies a relationship: 0.48 < TD / TTL < 0.5. Wherein, TD is the distance between the imaging side surface S1 of the first lens L1 and the image source side surface S10 of the fifth lens L5 on the optical axis O, and TTL is the distance between the imaging side surface S1 of the first lens L1 and the image source surface 201 of the optical lens 100 on the optical axis O. Specifically, TD / TTL can be 0.481, 0.483, 0.487, 0.490, 0.492, 0.496, or 0.499, etc. When the above relationship is satisfied, the overall length of the optical lens 100 can be avoided to be too long or too short, which is beneficial to realize the miniaturization design of the optical lens 100, while controlling the manufacturing difficulty of the optical lens 100, and a balance is achieved between the miniaturization design of the optical lens 100 and the manufacturing difficulty of the optical lens 100.

[0070] In some embodiments, the optical lens 100 satisfies a relationship: 0.6 < SD11 / SD51 < 0.8. Wherein, SD11 is the effective half aperture of the imaging side surface S1 of the first lens L1, and SD51 is the effective half aperture of the imaging side surface S9 of the fifth lens L5. Specifically, SD11 / SD51 can be 0.607, 0.631, 0.655, 0.711, 0.724, 0.759, 0.780, 0.791, or 0.796, etc. When the above relationship is satisfied, it is beneficial to limit the effective half aperture of the imaging side surface S9 of the first lens L1 and the fifth lens L5, avoid the aperture difference of the two sides of the optical lens 100 to be too large, which is beneficial to maintain the center balance of the optical lens 100, and also beneficial to the installation of the optical lens 100.

[0071] In some embodiments, the optical lens 100 satisfies a relationship: 0.8 < SD21 / SD42 < 0.9. Wherein, SD21 is the effective half aperture of the imaging side surface S3 of the second lens L2, and SD42 is the effective half aperture of the image source side surface S8 of the fourth lens L4. Specifically, SD21 / SD42 can be 0.801, 0.817, 0.846, 0.878, 0.886, 0.890, or 0.896, etc. When the above relationship is satisfied, it is beneficial to limit the effective half aperture of the imaging side surface S7 of the second lens L2 and the fourth lens L4, avoid the difference between the effective half aperture of the imaging side surface S3 of the second lens L2 and the effective half aperture of the image source side surface S8 of the fourth lens L4 to be too large to cause assembly difficulty, and beneficial to make the overall structure of the optical lens 100 more balanced, and ensure the assembly stability of the optical lens 100.

[0072] The application also provides a projection module 10, which comprises the optical lens 100 and an image display element 200. The image display element 200 is arranged at the image source side of the optical lens, and is used to generate an image light beam. The optical lens is used to project the image light beam generated by the image display element 200 to the imaging component to form an image picture. The image display element 200 can be a liquid crystal display (LCD), a liquid crystal on silicon (LCOS) panel, a digital micro-mirror device (DMD), an organic light-emitting diode (OLED) or other image display elements. It can be understood that the projection module 10 with the optical lens 100 can effectively control the total optical length of the optical lens 100, realize the light and thin design of the optical lens 100, improve the distortion of the edge field of view of the optical lens 100, and improve the projection imaging quality of the optical lens 100.

[0073] In some embodiments, the projection module further comprises a prism L6 and a light source (not shown). The prism L6 is arranged between the image display element 200 and the optical lens 100, and is used to guide the illumination light beam of the light source to the image display element 200, so that the image display element 200 can generate an image light beam and emit the image light beam to the image source side surface S10 of the fifth lens L5 of the optical lens 100 through the prism L6. The prism L6 can be a right-angle prism.

[0074] In some embodiments, the projection module further comprises a protective glass L7, which can be arranged between the prism L6 and the image display element 200. Since the protective glass L7 has high light transmittance and high strength, the arrangement of the protective glass L7 between the prism L6 and the image display element 200 can protect the image display element 200 from the external environment without affecting the normal use of the image display element 200.

[0075] The optical lens 100 and the projection module 200 of the present embodiment will be described in detail below in combination with specific parameters.

[0076] First embodiment

[0077] Please refer to Figure 1 , Figure 1The structure diagram of the projection module 200 disclosed in the first embodiment of the present application is shown in the figure. The projection module 200 comprises, in sequence from the imaging side to the image source side along the optical axis O, an optical lens 100, a prism L6, a protective glass L7 and an image display element 200. The optical lens 100 comprises, in sequence from the imaging side to the image source side along the optical axis O, an aperture 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5.

[0078] Further, the first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power and the fifth lens L5 has positive refractive power.

[0079] Further, the imaging side surface S1 and the image source side surface S2 of the first lens L1 are respectively concave and convex at the vicinity of the optical axis O; the imaging side surface S3 and the image source side surface S4 of the second lens L2 are respectively convex and concave at the vicinity of the optical axis O; the imaging side surface S5 and the image source side surface S6 of the third lens L3 are both concave at the vicinity of the optical axis O; the imaging side surface S7 and the image source side surface S8 of the fourth lens L4 are respectively concave and convex at the vicinity of the optical axis O; and the imaging side surface S9 and the image source side surface S10 of the fifth lens L5 are both convex at the vicinity of the optical axis O.

[0080] Specifically, taking the focal length f = 8.525 mm of the optical lens 100, the field of view FOV = 32° of the optical lens 100, the total optical length TTL = 16.586 mm of the optical lens 100, and the aperture number FNO = 2.49 of the optical lens 100 as examples, other parameters of the projection module 200 are given in Table 1 below. In Table 1, the elements along the optical axis O of the optical lens 100 are arranged in the order of the elements from top to bottom in Table 1 from the imaging side to the image source side. In the same lens, the surface with a smaller surface serial number is the imaging side surface of the lens, and the surface with a larger surface serial number is the image source side surface of the lens, such as the imaging side surface S1 and the image source side surface S2 of the first lens L1 corresponding to the surface serial numbers 2 and 3, respectively. The Y radius in Table 1 is the radius of curvature of the imaging side surface or the image source side surface with the corresponding surface serial number at the near optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens at the optical axis O, and the second value is the distance from the image source side surface of the lens to the next surface at the optical axis O. The value in the "thickness" parameter column of the diaphragm 101 is the distance from the diaphragm 101 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) at the optical axis O. By default, the direction from the imaging side surface of the first lens L1 to the image source side surface of the last lens is the positive direction of the optical axis O. When the value is negative, it indicates that the diaphragm 101 is set on the image source side of the vertex of the next surface. If the thickness of the diaphragm 101 is positive, the diaphragm 101 is on the imaging side of the vertex of the next surface. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are mm. In Table 1, the reference wavelength of the refractive index and the Abbe number of each lens is 587.6 nm, and the reference wavelength of the focal length is 530 nm.

[0081] Table 1

[0082]

[0083]

[0084] Referring to FIG. (A) in Figure 2 , FIG. (A) in Figure 2 shows the longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at wavelengths of 617 nm, 530 nm, and 460 nm. Figure 2 In FIG. (A) in Figure 2 , the abscissa along the X-axis direction represents the focus offset, and the ordinate along the Y-axis direction represents the normalized field of view. From FIG. (A) in

[0085] Referring to (B) in Figure 2 , FIG. (B) in Figure 2Figure (B) in Figure 1 shows the distortion curves of the optical lens 100 in the first embodiment at wavelengths of 617 nm, 530 nm and 460 nm. In the figure, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents the field of view angle, in °. From Figure (B) in Figure 1, it can be seen that the distortion of the optical lens 100 is well corrected. Figure 2

[0086] Referring to Figure (A), Figure (B) and Figure (C) in Figure 1, Figure 3 Figure 3 Figure (A), Figure (B) and Figure (C) in Figure 1 respectively show the astigmatism curves of the optical lens 100 in the first embodiment at wavelengths of 617 nm, 530 nm and 460 nm. In the figures, the abscissa along the X-axis direction represents the focal shift, and the ordinate along the Y-axis direction represents the field of view angle, in °. In the astigmatism curves, T represents the curvature of the imaging plane in the meridional direction, and S represents the curvature of the imaging plane in the sagittal direction, from Figure (A), Figure (B) and Figure (C) in Figure 1, it can be seen that, at the wavelengths, the astigmatism of the optical lens 100 is well compensated. Figure 3

[0087] Second Embodiment

[0088] Referring to Figure (A), Figure (B) and Figure (C) in Figure 2, Figure 4 Figure 4 Figure 2 is a schematic structural diagram of a projection module 200 according to the second embodiment of the present application. The projection module 200 comprises, in order from the imaging side to the image source side along the optical axis O, an optical lens 100, a prism L6, a protective glass L7 and an image display element 200. The optical lens 100 comprises, in order from the imaging side to the image source side along the optical axis O, an aperture stop 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5.

[0089] Further, in the second embodiment, the refractive power of each lens is consistent with that of each lens in the first embodiment. In the second embodiment, the difference between the surface shape of each lens and that of each lens in the first embodiment is that the imaging side surface S1 of the first lens L1 is a convex surface at the vicinity of the optical axis O, the imaging side surface S7 of the fourth lens L4 is a convex surface at the vicinity of the optical axis O, and the image source side surface S10 of the fifth lens L5 is a concave surface at the vicinity of the optical axis O.

[0090] ​​​​In the second embodiment, the effective focal length of the optical lens 100 is f = 8.925 mm, the field of view of the optical lens 100 is FOV = 32°, the total optical length of the optical lens 100 is TTL = 16.473 mm, and the F number of the optical lens 100 is FNO = 2.49. The other parameters in the second embodiment are shown in Table 2 below, and the definitions of the parameters can be obtained from the description of the previous embodiments, which will not be repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 2 are mm. In Table 2, the reference wavelength of the refractive index and Abbe number of each lens is 587.6 nm, and the reference wavelength of the focal length is 530 nm.

[0091] Table 2

[0092]

[0093] Referring to Figure 5 , it can be seen from Figure 5 the longitudinal spherical aberration graph of Figure (A) and the distortion curve graph of Figure (B) that the longitudinal spherical aberration and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in Figure (A) and Figure (B) can refer to the description of the first embodiment regarding Figure 5 the wavelengths corresponding to the curves in Figure (A) and Figure (B) can refer to the description of the first embodiment regarding Figure 2 the wavelengths corresponding to the curves in Figure (A) and Figure (B) can refer to the description of the first embodiment regarding

[0094] Referring to Figure 6 , it can be seen from Figure 6 Figures (A), (B), and (C) that the astigmatism of the optical lens 100 is well compensated. Regarding the wavelengths corresponding to the curves in Figure (A), Figure (B), and Figure (C), they can refer to the description of the first embodiment regarding Figure 6 the wavelengths corresponding to the curves in Figure (A), Figure (B), and Figure (C) can refer to the description of the first embodiment regarding Figure 3 the wavelengths corresponding to the curves in Figure (A), Figure (B), and Figure (C) can refer to the description of the first embodiment regarding

[0095] Third Embodiment

[0096] Referring to Figure 7 , Figure 7 Figure 2 shows a structural schematic diagram of a projection module 200 according to the third embodiment of the present application. The projection module 200 includes, in order from the imaging side to the image source side along the optical axis O, an optical lens 100, a prism L6, a protective glass L7, and an image display element 200. The optical lens 100 includes, in order from the imaging side to the image source side along the optical axis O, a diaphragm 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

[0097] Further, in the third embodiment, the refractive power of each lens is consistent with that of each lens in the first embodiment. In the third embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that the imaging-side surface S7 of the fourth lens L4 is a convex surface at the near optical axis O and the image-source-side surface S10 of the fifth lens L5 is a concave surface at the near optical axis O.

[0098] In the third embodiment, the effective focal length f of the optical lens 100 is 8.925 mm, the field of view FOV of the optical lens 100 is 32°, the total track length TTL of the optical lens 100 is 16.503 mm, and the F number FNO of the optical lens 100 is 2.49. Other parameters in the third embodiment are shown in Table 3 below, and the definitions of the parameters can be obtained from the foregoing description, which will not be repeated here. It can be understood that the units of the Y radius, the thickness, and the focal length in Table 3 are mm. In Table 3, the reference wavelength of the refractive index and the Abbe number of each lens is 587.6 nm, and the reference wavelength of the focal length is 530 nm.

[0099] Table 3

[0100]

[0101] Referring to Figure 8 , it can be seen from Figure 8 , the longitudinal spherical aberration and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in Figure 8 , the wavelengths corresponding to the curves in Figure 2 , the wavelengths corresponding to the curves in

[0102] Referring to Figure 9 , it can be seen from Figure 9 , the astigmatism of the optical lens 100 is well compensated. In Figure 9 , the wavelengths corresponding to the curves in Figure 3 , the wavelengths corresponding to the curves in

[0103] Fourth Embodiment

[0104] Referring to Figure 10This is a schematic diagram of the projection module 200 disclosed in the fourth embodiment of this application. The projection module 200 includes an optical lens 100, a prism L6, a protective glass L7, and an image display element 200, arranged sequentially along the optical axis O from the imaging side to the image source side. The optical lens 100 includes an aperture stop 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, arranged sequentially along the optical axis O from the imaging side to the image source side.

[0105] Furthermore, in the fourth embodiment, the refractive power of each lens is the same as that of each lens in the first embodiment. However, the difference between the surface shape of each lens in the fourth embodiment and that in the first embodiment is that the image source side surface S10 of the fifth lens L5 is concave at the near-optical axis O.

[0106] In the fourth embodiment, the focal length f = 8.906 mm, the field of view (FOV) of the optical lens 100 = 32°, the total optical length (TTL) of the optical lens 100 = 16.520 mm, and the aperture number (FNO) = 2.49 are taken as examples. Other parameters in this fourth embodiment are given in Table 4 below, and the definitions of each parameter can be derived from the foregoing description, and will not be repeated here. It is understood that the units for Y-radius, thickness, and focal length in Table 4 are all mm. Furthermore, the reference wavelength for the refractive index and Abbe number of each lens in Table 4 is 587.6 nm, and the reference wavelength for the focal length is 530 nm.

[0107] Table 4

[0108]

[0109] Please see Figure 11 ,Depend on Figure 11 As can be seen from the longitudinal spherical aberration diagram in Figure (A) and the distortion curve in Figure (B), the longitudinal spherical aberration and distortion of the optical lens 100 are well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 11 The wavelengths corresponding to the curves in Figures (A) and (B) can be found in the first embodiment regarding... Figure 2 The contents described in Figure (A) and Figure (B) are not repeated here.

[0110] Please see Figure 12 ,Depend on Figure 12 As shown in Figures (A), (B), and (C), the astigmatism of optical lens 100 is well compensated. Regarding... Figure 12 The wavelengths corresponding to the curves in Figures (A), (B), and (C) can be found in the first embodiment regarding the wavelengths. Figure 3 The contents described in Figures (A), (B), and (C) are not repeated here.

[0111] Fifth Embodiment

[0112] Referring to Figure 13 Fig. 5 is a schematic diagram of the projection module 200 according to the fifth embodiment of the present application. The projection module 200 comprises, in order from the imaging side to the image source side along the optical axis O, an optical lens 100, a prism L6, a protective glass L7, and an image display element 200. The optical lens 100 comprises, in order from the imaging side to the image source side along the optical axis O, an aperture stop 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

[0113] Further, in the fifth embodiment, the refractive power of each lens is consistent with that of each lens in the first embodiment. However, the surface shape of each lens in the fifth embodiment is different from that of each lens in the first embodiment in that the imaging side surface S1 of the first lens L1 is a convex surface at the vicinity of the optical axis O.

[0114] In the fifth embodiment, the focal length f of the optical lens 100 is 8.728 mm, the field of view FOV of the optical lens 100 is 32°, the total track length TTL of the optical lens 100 is 16.443 mm, and the F number FNO of the optical lens 100 is 2.49. The other parameters in the fifth embodiment are given in Table 5 below, and the definitions of the parameters can be obtained from the foregoing descriptions and will not be repeated here. It should be understood that the units of the Y radius, the thickness, and the focal length in Table 5 are mm. In Table 5, the refractive index, the Abbe number, and the reference wavelength of the focal length of each lens are 587.6 nm and 530 nm, respectively.

[0115] Table 5

[0116]

[0117]

[0118] Referring to Figure 14 Fig. 5 is a schematic diagram of the projection module 200 according to the fifth embodiment of the present application. The projection module 200 comprises, in order from the imaging side to the image source side along the optical axis O, an optical lens 100, a prism L6, a protective glass L7, and an image display element 200. The optical lens 100 comprises, in order from the imaging side to the image source side along the optical axis O, an aperture stop 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. Figure 14 As can be seen from the longitudinal spherical aberration diagram of Fig. 5(A) and the distortion curve diagram of Fig. 5(B), the longitudinal spherical aberration and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the other parameters of the optical lens 100 of this embodiment are consistent with those of the optical lens 100 of the first embodiment, and thus the optical lens 100 of this embodiment also has good imaging quality. Figure 14 The wavelengths corresponding to the curves in Fig. 5(A) and Fig. 5(B) can refer to the descriptions of the wavelengths corresponding to the curves in Fig. 1(A) and Fig. 1(B) of the first embodiment, and will not be repeated here. Figure 2 The wavelengths corresponding to the curves in Fig. 5(A) and Fig. 5(B) can refer to the descriptions of the wavelengths corresponding to the curves in Fig. 1(A) and Fig. 1(B) of the first embodiment, and will not be repeated here.

[0119] Referring to Figure 15 Fig. 5 is a schematic diagram of the projection module 200 according to the fifth embodiment of the present application. The projection module 200 comprises, in order from the imaging side to the image source side along the optical axis O, an optical lens 100, a prism L6, a protective glass L7, and an image display element 200. The optical lens 100 comprises, in order from the imaging side to the image source side along the optical axis O, an aperture stop 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. Figure 15It can be seen from FIG. (A), FIG. (B) and FIG. (C) in Table 2 that the astigmatism of the optical lens 100 is well compensated. Regarding Figure 15 The wavelengths corresponding to the curves in FIG. (A), FIG. (B) and FIG. (C) in Table 2 can refer to the wavelengths described in the first embodiment regarding Figure 3 The contents described in FIG. (A), FIG. (B) and FIG. (C) in Table 2 are not repeated here.

[0120] Please refer to Table 6, which is a summary of the ratios of the relationships in the first embodiment to the fifth embodiment of the present application.

[0121] Table 6

[0122]

[0123] Please refer to Figure 16 The present application also discloses an electronic device 1, which comprises a housing 20 and the projection module 200 described above, and the projection module 200 is arranged on the housing 20 to project and image. The electronic device 1 includes but is not limited to smart glasses, smart helmets, etc. It can be understood that the electronic device 1 with the above-mentioned projection module 200 can effectively control the total optical length of the optical lens 100, realize the light and thin design of the optical lens 100, improve the distortion of the edge field of view of the optical lens 100, and improve the projection and imaging quality of the optical lens 100.

[0124] The optical lens, the projection module and the electronic device disclosed in the above embodiments of the present application are described in detail, and the principles and implementation modes of the present application are described by applying specific examples. The above embodiment is only used to help understand the optical lens, the projection module and the electronic device and the core idea thereof; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and the application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. An optical lens, characterized in that, The optical lens has five lenses with refractive power. The five lenses are, in order from the imaging side to the image source side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; The first lens has positive refractive power, and the surface of the image source side of the first lens is convex near the optical axis; The second lens has positive refractive power, the surface of the imaging side of the second lens is convex near the optical axis, and the surface of the image source side of the second lens is concave near the optical axis; The third lens has negative refractive power, the surface of the imaging side of the third lens is concave near the optical axis, and the surface of the image source side of the third lens is concave near the optical axis; The fourth lens has positive refractive power, and the surface of the image source side of the fourth lens is convex near the optical axis; The fifth lens has positive refractive power, and the surface of the imaging side of the fifth lens is convex near the optical axis; The optical lens satisfies the following relationship: 5.3mm < f * tan(FOV) < 5.6mm; Where f is the focal length of the optical lens, and FOV is the maximum field angle of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 30° < FOV < 35°; Where FOV is the maximum field angle of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.31mm 2 <T45*f*tan(FOV)<0.34mm 2 ; Where T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 4 < f1 / f + f2 / f < 8, and / or, 2 < f2 / f < 6, and / or, 0.6 < f4 / f < 0.8; Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f4 is the focal length of the fourth lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: -3 < R2 / f < -1, and / or, |R1 / R2| > 1.5, and / or, 0.9 < R3 / R4 < 1.1; Where R1 is the radius of curvature of the imaging side surface of the first lens at the optical axis, R2 is the radius of curvature of the image source side surface of the first lens at the optical axis, R3 is the radius of curvature of the imaging side surface of the second lens at the optical axis, and R4 is the radius of curvature of the image source side surface of the second lens at the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.4 < CT1 / (CT2 + CT3) < 0.6, and / or, 11 < f2 / CT _ 2 < 40; Where CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and f2 is the focal length of the second lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.48 < TD / TTL < 0.5, 0.29 < ImgH / TTL < 0.31; Where TD is the distance on the optical axis from the imaging side surface of the first lens to the image source side surface of the fifth lens, TTL is the distance on the optical axis from the imaging side surface of the first lens to the image source surface of the optical lens, and ImgH is the image source height corresponding to the maximum field angle of the optical lens.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.6 < SD11 / SD51 < 0.8, and / or, 0.8 < SD21 / SD42 < 0.9; Wherein, SD11 is the effective semi-aperture of the imaging-side surface of the first lens, SD21 is the effective semi-aperture of the imaging-side surface of the second lens, SD42 is the effective semi-aperture of the image-source side surface of the fourth lens, and SD51 is the effective semi-aperture of the imaging-side surface of the fifth lens.

9. A projection module, characterized in that, The projection module includes an image display element and an optical lens as described in any one of claims 1-8, and the image display element is disposed on the image-source side of the optical lens.

10. An electronic device, characterized in that, The electronic device includes a housing and a projection module as described in claim 9, and the projection module is disposed in the housing.

Images