Projection lens set

Abstract

The present application discloses a projection lens group, which includes, in order from the imaging side to the image source side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with optical power, whose near imaging side is a convex surface; a fourth lens with optical power, whose near imaging side is a convex surface; and a fifth lens with negative optical power, whose near imaging side is a concave surface; at least one lens from the first lens to the fourth lens is a glass lens; the distance TTL from the image source surface of the projection lens group to the near imaging side of the first lens on the optical axis satisfies: TTL<4.8mm; and the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 1.5<|f3 / f1|<6.0.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to a projection lens assembly. Background Art

[0002] With the continuous upgrading of imaging technology, more and more customers are beginning to favor small and portable micro-projection devices. However, most projection devices on the market currently use a large number of lenses in the projection lens group and a complex optical path design. In addition, this also leads to high prices, large size, high power consumption, and inconvenience in carrying.

[0003] How to reasonably allocate the optical focal length and surface characteristics of each lens in the projection lens group and design the key technical parameters of the projection lens group to obtain a projection lens group with the characteristics of miniaturization, portability, high quality, and high resolution is one of the difficult problems that many lens designers are currently trying to solve. Summary of the invention

[0004] On one hand, the present application provides such a projection lens group, which includes, in order from the imaging side to the image source side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with optical power, whose near imaging side is convex; a fourth lens with optical power, whose near imaging side is convex; and a fifth lens with negative optical power, whose near imaging side is concave. At least one lens from the first lens to the fourth lens is a glass lens; the distance TTL from the image source surface of the projection lens group to the near imaging side of the first lens on the optical axis can satisfy: TTL<4.8mm; and the effective focal length f1 of the first lens and the effective focal length f3 of the third lens can satisfy: 1.5<|f3 / f1|<6.0.

[0005] In one embodiment, there is at least one aspherical mirror surface from the near imaging side surface of the first lens to the near image source side surface of the fifth lens.

[0006] In one embodiment, the incident angle MCRA of the maximum chief ray on the imaging side may satisfy: 1.2<1 / tan(MCRA)<2.1.

[0007] In one embodiment, the aperture value Fno of the projection lens assembly may satisfy: Fno<1.9.

[0008] In one embodiment, the relative illumination RI of the projection lens assembly may satisfy: RI ≥ 36%.

[0009] In one embodiment, the total effective focal length f of the projection lens assembly and the effective focal length f5 of the fifth lens may satisfy: -2<f / f5<0.

[0010] In one embodiment, the distance SAG32 from the intersection of the near image source side of the third lens and the optical axis to the vertex of the effective radius of the near image source side of the third lens on the optical axis and the distance SAG42 from the intersection of the near image source side of the fourth lens and the optical axis to the vertex of the effective radius of the near image source side of the fourth lens on the optical axis may satisfy: 0<|SAG32 / SAG42|<1.5.

[0011] In one embodiment, the curvature radius R1 of the near imaging side surface of the first lens, the curvature radius R2 of the near image source side surface of the first lens, and the effective focal length f1 of the first lens may satisfy: 0.5<(R1+R2) / f1<1.5.

[0012] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 2<CT4 / T34<6.

[0013] In one embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens and the total effective focal length f of the projection lens group may satisfy: 0.9<f123 / f<1.6.

[0014] In one embodiment, the distance TTL from the image source surface of the projection lens group to the near imaging side surface of the first lens on the optical axis and the sum ΣAT of the spacing distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis may satisfy: 2<TTL / ΣAT<4.

[0015] In one embodiment, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the spacing distance T23 between the second lens and the third lens on the optical axis, and the spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 2.0<(CT2+CT3+CT4) / (T23+T34)<5.0.

[0016] In one embodiment, a center thickness CT1 of the first lens on the optical axis and an edge thickness ET1 of the first lens may satisfy: 1.5<CT1 / ET1<2.5.

[0017] In one embodiment, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens may satisfy: V1-V2>40.

[0018] In one embodiment, the projection lens assembly further includes an aperture stop disposed between the imaging side and the first lens.

[0019] On the other hand, the present application provides a projection lens group. The projection lens group includes, in order from the imaging side to the image source side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with optical power, whose side surface near the imaging is convex; a fourth lens with optical power, whose side surface near the imaging is convex; and a fifth lens with negative optical power, whose side surface near the imaging is concave. The combined focal length f123 of the second lens and the third lens and the total effective focal length f of the projection lens group satisfy: 0.9<f123 / f<1.6.

[0020] The present application adopts multiple (for example, five) lenses, and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and axial spacing between each lens, the above-mentioned projection lens group has at least one beneficial effect of miniaturization, small astigmatism, high brightness, high imaging quality, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 A schematic structural diagram of a projection lens assembly according to Embodiment 1 of the present application is shown;

[0023] Figure 2A and Figure 2B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 1 are respectively shown;

[0024] Figure 3 A schematic structural diagram of a projection lens assembly according to Embodiment 2 of the present application is shown;

[0025] Figure 4A and Figure 4B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 2 are respectively shown;

[0026] Figure 5 A schematic structural diagram of a projection lens assembly according to Embodiment 3 of the present application is shown;

[0027] Fig. 6A and Figure 6B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 3 are respectively shown;

[0028] Figure 7 A schematic structural diagram of a projection lens assembly according to Embodiment 4 of the present application is shown;

[0029] Fig. 8A and Figure 8B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 4 are respectively shown;

[0030] Fig. 9 A schematic structural diagram of a projection lens assembly according to Embodiment 5 of the present application is shown;

[0031] Fig. 10A and Fig. 10B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 5 are shown respectively;

[0032] Fig.11 A schematic structural diagram of a projection lens assembly according to Embodiment 6 of the present application is shown;

[0033] Fig. 12A and Fig. 12B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 6 are shown respectively;

[0034] Fig.13 A schematic structural diagram of a projection lens assembly according to Embodiment 7 of the present application is shown;

[0035] Fig.14A and Fig. 14B The relative illumination curve and astigmatism curve of the projection lens assembly of Example 7 are respectively shown;

[0036] Fig.15 A schematic structural diagram of a projection lens assembly according to Embodiment 8 of the present application is shown; and

[0037] Fig.16A and Fig. 16B The relative illumination curve and astigmatism curve of the projection lens group of Example 8 are shown respectively. DETAILED DESCRIPTION

[0038] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0040] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0041] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the imaging side is called the near imaging side of the lens, and the surface of each lens closest to the image source side is called the near image source side of the lens.

[0042] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The features, principles and other aspects of the present application are described in detail below.

[0046] The projection lens group according to the exemplary embodiment of the present application may include five lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The five lenses are arranged in sequence from the imaging side to the image source side along the optical axis. Any two adjacent lenses from the first lens to the fifth lens may have a spacing distance between them.

[0047] In an exemplary embodiment, the first lens may have positive optical power; the second lens may have positive optical power or negative optical power; the third lens may have positive optical power or negative optical power, and its near imaging side may be convex; the fourth lens may have positive optical power or negative optical power, and its near imaging side may be convex; and the fifth lens may have negative optical power, and its near imaging side may be concave.

[0048] In an exemplary embodiment, by reasonably controlling and matching the optical power and surface shape of each lens of the system, various aberrations of the system can be effectively balanced to ensure that the system has high imaging quality.

[0049] In an exemplary embodiment, at least one of the first to fourth lenses may be a glass lens. The refractive index and Abbe number of glass materials are widely distributed, and the range of options is relatively wide. At the same time, the thermal expansion coefficient of glass is low and is less affected by the ambient temperature. Therefore, it can be effectively applied to the projection lens to reduce its temperature drift and improve the thermal stability of the system. In addition, the chromatic aberration of the system can be effectively reduced by the reasonable coordination of the materials between the lenses.

[0050] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: TTL<4.8mm, where TTL is the distance from the image source surface of the projection lens assembly to the near imaging side surface of the first lens on the optical axis. More specifically, TTL may further satisfy: TTL<4.6mm. Satisfying TTL<4.8mm can ensure the miniaturization of the system.

[0051] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: 1.5<|f3 / f1|<6.0, where f1 is the effective focal length of the first lens and f3 is the effective focal length of the third lens. Satisfying 1.5<|f3 / f1|<6.0 is beneficial to correcting the astigmatism error of the system and balancing the image quality on the meridional image plane and the sagittal image plane.

[0052] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: 1.2<1 / tan(MCRA)<2.1, where MCRA is the incident angle of the maximum principal ray on the imaging side. Satisfying 1.2<1 / tan(MCRA)<2.1 is conducive to balancing the projection angle of the system and the light energy utilization rate of the image source, and is conducive to ensuring high resolution and uniformity of the projected imaging picture.

[0053] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: Fno<1.9, where Fno is the aperture value of the projection lens assembly. Satisfying Fno<1.9 helps to improve the lens's ability to receive light source energy, thereby obtaining a projection image with higher brightness and resolution.

[0054] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: RI ≥ 36%, where RI is the relative illumination of the projection lens assembly. Satisfying RI ≥ 36% can effectively reduce or avoid problems such as glare and dark corners in the image, and ensure that the projection system has high imaging uniformity.

[0055] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: -2 < f / f5 < 0, where f is the total effective focal length of the projection lens assembly, and f5 is the effective focal length of the fifth lens. More specifically, f and f5 may further satisfy: -1.6 < f / f5 < -0.2. Satisfying -2 < f / f5 < 0 can control the contribution of the fifth lens to the spherical aberration of the system, so that the system has a higher imaging quality, and is also conducive to reducing the optical size of the system.

[0056] In an exemplary embodiment, the projection lens group according to the present application may satisfy: 0<|SAG32 / SAG42|<1.5, wherein SAG32 is the distance from the intersection of the near image source side of the third lens and the optical axis to the effective radius vertex of the near image source side of the third lens on the optical axis, and SAG42 is the distance from the intersection of the near image source side of the fourth lens and the optical axis to the effective radius vertex of the near image source side of the fourth lens on the optical axis. More specifically, SAG32 and SAG42 may further satisfy: 0.4<|SAG32 / SAG42|<1.4. Satisfying 0<|SAG32 / SAG42|<1.5 can effectively control the inclination angles of the third lens and the fourth lens, which is beneficial to correcting the astigmatism aberration of the projection system, and ensuring the processability of the lens, thereby improving the production yield.

[0057] In an exemplary embodiment, the projection lens group according to the present application may satisfy: 0.5<(R1+R2) / f1<1.5, wherein R1 is the radius of curvature of the near imaging side of the first lens, R2 is the radius of curvature of the near image source side of the first lens, and f1 is the effective focal length of the first lens. More specifically, R1, R2 and f1 may further satisfy: 0.6<(R1+R2) / f1<1.4. Satisfying 0.5<(R1+R2) / f1<1.5 is conducive to reducing the stray light generated by the first lens and improving the imaging quality of the optical imaging system; in addition, it is conducive to reducing the total optical length of the lens and realizing the miniaturization of the system.

[0058] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: 2<CT4 / T34<6, wherein CT4 is the center thickness of the fourth lens on the optical axis, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis. Satisfying 2<CT4 / T34<6 can reduce the field curvature and distortion of the projection lens and ensure the miniaturization of the system.

[0059] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: 0.9<f123 / f<1.6, wherein f123 is the combined focal length of the first lens, the second lens, and the third lens, and f is the total effective focal length of the projection lens assembly. Satisfying 0.9<f123 / f<1.6 can control the distribution of the system's focal power, reflect the focusing characteristics of the front lens group of the projection lens, and effectively correct the spherical aberration and astigmatism of the system.

[0060] In an exemplary embodiment, the projection lens group according to the present application may satisfy: 2<TTL / ΣAT<4, wherein TTL is the distance from the image source surface of the projection lens group to the near imaging side surface of the first lens on the optical axis, and ΣAT is the sum of the spacing distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis. More specifically, TTL and ΣAT may further satisfy: 2.5<TTL / ΣAT<4. Satisfying 2<TTL / ΣAT<4 is beneficial to correcting the aberration of the projection system, and is also beneficial to the assembly of each lens, so that the projection system has better processability.

[0061] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: 2.0<(CT2+CT3+CT4) / (T23+T34)<5.0, wherein CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, T23 is the spacing distance between the second lens and the third lens on the optical axis, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis. Satisfying 2.0<(CT2+CT3+CT4) / (T23+T34)<5.0 is conducive to correcting the off-axis aberration of the projection lens and reducing the intensity of ghost images, so that the system has higher imaging quality; in addition, it is also conducive to ensuring the assemblability and miniaturization of the system.

[0062] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: 1.5<CT1 / ET1<2.5, wherein CT1 is the center thickness of the first lens on the optical axis, and ET1 is the edge thickness of the first lens. More specifically, CT1 and ET1 may further satisfy: 1.6<CT1 / ET1<2.5. Satisfying 1.5<CT1 / ET1<2.5 can effectively control the shape of the first lens, making it processable and having lower molding stress.

[0063] In an exemplary embodiment, the projection lens assembly according to the present application may satisfy: V1-V2>40, where V1 is the Abbe number of the first lens and V2 is the Abbe number of the second lens. Satisfying V1-V2>40 can effectively reduce the chromatic aberration of the system and improve the imaging quality of the system.

[0064] In an exemplary embodiment, the projection lens assembly according to the present application further includes an aperture provided between the imaging side and the first lens. Providing the aperture between the imaging side and the first lens facilitates the coordination test between the assembled projection lens assembly and the test equipment, and can reduce the front end size of the projection lens assembly, meeting the characteristics of lightness and miniaturization of the system.

[0065] The projection lens group according to the above-mentioned embodiment of the present application may use multiple lenses, such as the five lenses described above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between each lens, etc., the incident light can be effectively converged, the total length of the projection lens group can be reduced, and the processability of the projection lens group can be improved, so that the structure of each lens is more compact, the projection lens group is more conducive to production and processing, and has higher practicality. Through the above configuration, the projection lens group according to the exemplary embodiment of the present application can have characteristics such as miniaturization, large aperture, smaller projection ratio, small astigmatism, high brightness, high resolution, and high imaging quality.

[0066] In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the near imaging side surface of the first lens to the near image source side surface of the fifth lens is an aspherical mirror surface. The characteristic of the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the near imaging side surface and the near image source side surface of each lens of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspherical mirror surface. Optionally, the near imaging side surface and the near image source side surface of each lens of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical mirror surfaces.

[0067] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the projection lens group can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiments, the projection lens group is not limited to including five lenses. If necessary, the projection lens group may also include other numbers of lenses.

[0068] Specific embodiments of the projection lens assembly applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0069] Example 1

[0070] The following reference Figures 1 to 2B A projection lens assembly according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of a projection lens assembly according to Embodiment 1 of the present application is shown.

[0071] like Figure 1As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0072] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has positive focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has negative focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is concave. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is convex. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0073] Table 1 shows the basic parameters of the projection lens assembly of Example 1, wherein the units of the radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0074]

[0075] Table 1

[0076] In this example, the total effective focal length f of the projection lens group is 3.41 mm, the total length TTL of the projection lens group (i.e., the distance from the image source surface S11 of the projection lens group to the near imaging side S1 of the first lens E1 on the optical axis) is 4.00 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.32 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 38.48°, the aperture value Fno of the projection lens group is 1.70, the relative illumination RI of the projection lens group is 57.51%, and the incident angle MCRA of the maximum chief light on the imaging side is 26.29°.

[0077] In Embodiment 1, the near imaging side surface and the near image source side surface of any lens from the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0078]

[0079] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0080]

[0081] Table 2

[0082] Figure 2A The relative illumination curve of the projection lens assembly of Example 1 is shown, which indicates the relative illumination values ​​corresponding to different image heights. Figure 2B FIG. 1 shows the astigmatism curve of the projection lens group of Example 1, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figure 2A and Figure 2B It can be seen that the projection lens assembly provided in Example 1 can achieve good imaging quality.

[0083] Example 2

[0084] The following reference Figures 3 to 4B The projection lens assembly according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of a projection lens assembly according to Embodiment 2 of the present application is shown.

[0085] like Figure 3 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0086] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has positive focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is concave. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is convex. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0087] In this example, the total effective focal length f of the projection lens group is 3.22 mm, the total length TTL of the projection lens group is 4.06 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.23 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 38.50°, the aperture value Fno of the projection lens group is 1.61, the relative illumination RI of the projection lens group is 58.90%, and the incident angle MCRA of the maximum chief light on the imaging side is 29.58°.

[0088] Table 3 shows the basic parameters of the projection lens set of Example 2, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0089]

[0090] Table 3

[0091] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -8.3763E-03 -1.9634E-02 4.9747E-02 -1.1223E-01 1.1614E-01 -6.6159E-02 1.3433E-02 0.0000E+00 0.0000E+00 S2 -6.1945E-02 -8.4678E-03 -6.1635E-02 4.7462E-02 -6.7439E-02 9.3306E-02 -4.0878E-02 0.0000E+00 0.0000E+00 S3 -1.6299E-02 -1.1116E-01 1.4818E-01 -5.1704E-01 9.2012E-01 -5.2680E-01 8.3761E-02 0.0000E+00 0.0000E+00 S4 4.9992E-03 -7.2272E-02 2.0722E-01 -8.4628E-01 1.8033E+00 -1.6388E+00 6.4555E-01 0.0000E+00 0.0000E+00 S5 -1.5414E-01 5.5993E-02 -1.2306E-01 -1.5307E-01 4.2006E-01 -4.9906E-01 2.0901E-01 0.0000E+00 0.0000E+00 S6 -2.4089E-01 7.8285E-02 7.9325E-02 -4.4104E-01 6.0135E-01 -3.9686E-01 1.0625E-01 0.0000E+00 0.0000E+00 S7 -1.4008E-01 -6.0268E-03 3.0165E-02 -7.0187E-02 5.3253E-02 -1.7225E-02 3.3784E-03 -4.6577E-04 0.0000E+00 S8 -3.6831E-02 -5.3236E-02 6.1965E-02 -5.5432E-02 3.9480E-02 -1.6935E-02 3.7968E-03 -3.5128E-04 0.0000E+00 S9 -3.9922E-01 2.3095E-01 -2.9472E-02 -1.6251E-02 7.9834E-03 -1.5558E-03 1.4936E-04 -5.8528E-06 0.0000E+00 S10 -2.2198E-01 1.9486E-01 -1.4095E-01 7.5179E-02 -2.6267E-02 5.4786E-03 -6.1009E-04 2.7774E-05 0.0000E+00

[0092] Table 4

[0093] Figure 4A The relative illumination curve of the projection lens assembly of Example 2 is shown, which indicates the relative illumination values ​​corresponding to different image heights. Figure 4B FIG. 2 shows the astigmatism curve of the projection lens group of Example 2, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figure 4A and Figure 4B It can be seen that the projection lens assembly provided in Example 2 can achieve good imaging quality.

[0094] Example 3

[0095] The following reference Figures 5 to 6B A projection lens assembly according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of a projection lens assembly according to Embodiment 3 of the present application is shown.

[0096] like Figure 5 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0097] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has negative focal power, and its near imaging side surface S3 is concave, and the near image source side surface S4 is convex. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is convex. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is concave. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0098] In this example, the total effective focal length f of the projection lens group is 3.16 mm, the total length TTL of the projection lens group is 4.39 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.33 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 38.52°, the aperture value Fno of the projection lens group is 1.58, the relative illumination RI of the projection lens group is 47.44%, and the incident angle MCRA of the maximum chief light on the imaging side is 29.13°.

[0099] Table 5 shows the basic parameters of the projection lens set of Example 3, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0100]

[0101] Table 5

[0102] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.5325E-03 3.7433E-03 -2.8675E-02 6.9136E-02 -1.1557E-01 9.8026E-02 -3.7733E-02 0.0000E+00 0.0000E+00 S2 -1.4314E-02 -4.2637E-02 5.7035E-02 -1.9346E-01 2.4576E-01 -1.7246E-01 4.9300E-02 0.0000E+00 0.0000E+00 S3 -6.3425E-02 -4.3344E-02 2.5603E-02 -4.4207E-02 1.8648E-01 -1.5986E-01 4.5054E-02 0.0000E+00 0.0000E+00 S4 9.8986E-03 -6.3910E-02 2.6490E-01 -7.8709E-01 1.3681E+00 -1.1057E+00 3.6596E-01 0.0000E+00 0.0000E+00 S5 -1.0278E-01 9.4613E-02 -1.3096E-01 -2.3739E-01 5.6005E-01 -4.8062E-01 1.3831E-01 0.0000E+00 0.0000E+00 S6 -2.4962E-01 2.2335E-01 -1.8774E-01 -4.0133E-03 9.1807E-02 -5.7076E-02 8.8921E-03 0.0000E+00 0.0000E+00 S7 -3.7939E-02 -4.7751E-02 1.0495E-01 -1.1707E-01 7.3887E-02 -2.5678E-02 4.5483E-03 -3.1735E-04 0.0000E+00 S8 -5.0465E-02 4.1232E-03 -2.0929E-02 2.0295E-02 -7.8010E-03 1.6012E-03 -2.0317E-04 1.3600E-05 0.0000E+00 S9 -3.6186E-01 -3.5299E-02 1.9827E-01 -1.0838E-01 2.7985E-02 -3.8777E-03 2.7910E-04 -8.2540E-06 0.0000E+00 S10 1.4692E-01 -3.3413E-01 2.2348E-01 -7.9964E-02 1.7358E-02 -2.3658E-03 1.8983E-04 -6.8263E-06 0.0000E+00

[0103] Table 6

[0104] Fig. 6A The relative illumination curve of the projection lens assembly of Example 3 is shown, which indicates the relative illumination values ​​corresponding to different image heights. Figure 6B FIG. 2 shows the astigmatism curve of the projection lens group of Example 3, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig. 6A and Figure 6B It can be seen that the projection lens assembly provided in Example 3 can achieve good imaging quality.

[0105] Example 4

[0106] The following reference Figures 7 to 8B A projection lens assembly according to Embodiment 4 of the present application is described. Figure 7 A schematic structural diagram of a projection lens assembly according to Embodiment 4 of the present application is shown.

[0107] like Figure 7 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0108] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has negative focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is convex. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is convex. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0109] In this example, the total effective focal length f of the projection lens group is 3.70 mm, the total length TTL of the projection lens group is 4.54 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.67 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 38.50°, the aperture value Fno of the projection lens group is 1.85, the relative illumination RI of the projection lens group is 51.25%, and the incident angle MCRA of the maximum chief light on the imaging side is 36.78°.

[0110] Table 7 shows the basic parameters of the projection lens set of Example 4, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0111]

[0112] Table 7

[0113]

[0114] Table 8

[0115] Fig. 8A The relative illumination curve of the projection lens assembly of Example 4 is shown, which indicates the relative illumination values ​​corresponding to different image heights. Figure 8B FIG. 4 shows the astigmatism curve of the projection lens group of Example 4, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig. 8A and Figure 8B It can be seen that the projection lens assembly provided in Example 4 can achieve good imaging quality.

[0116] Example 5

[0117] The following reference Figures 9 to 10B A projection lens assembly according to Embodiment 5 of the present application is described. Fig. 9 A schematic structural diagram of a projection lens assembly according to Embodiment 5 of the present application is shown.

[0118] like Fig. 9 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0119] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has negative focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is convex. The fourth lens E4 has negative focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is concave. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is convex. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0120] In this example, the total effective focal length f of the projection lens group is 3.68 mm, the total length TTL of the projection lens group is 4.55 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.75 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 38.50°, the aperture value Fno of the projection lens group is 1.84, the relative illumination RI of the projection lens group is 44.39%, and the incident angle MCRA of the maximum chief light on the imaging side is 37.57°.

[0121] Table 9 shows the basic parameters of the projection lens set of Example 5, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0122]

[0123] Table 9

[0124] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.6229E-12 4.6454E-14 -2.7287E-13 7.8285E-13 -1.1747E-12 8.8309E-13 -2.6194E-13 0.0000E+00 0.0000E+00 S2 -2.1793E-02 -6.9508E-03 -2.1151E-02 3.5242E-02 -4.4434E-02 3.0618E-02 -1.0311E-02 0.0000E+00 0.0000E+00 S3 -1.2259E-01 6.0623E-02 2.0254E-03 -7.2023E-02 2.3051E-01 -2.2080E-01 6.7006E-02 0.0000E+00 0.0000E+00 S4 -9.5155E-02 1.0090E-01 -3.3513E-02 -8.3054E-03 2.0015E-01 -2.2715E-01 8.7405E-02 0.0000E+00 0.0000E+00 S5 -4.0350E-02 1.4230E-02 -5.5992E-02 8.7226E-02 -8.4557E-02 4.6019E-02 -9.5196E-03 0.0000E+00 0.0000E+00 S6 -1.5925E-01 7.2859E-02 -8.6834E-02 6.7001E-02 -4.1359E-02 1.5711E-02 -3.1390E-03 0.0000E+00 0.0000E+00 S7 -1.4275E-01 5.9928E-03 1.7504E-03 -5.3308E-02 8.2855E-02 -6.3629E-02 2.4645E-02 -3.8090E-03 0.0000E+00 S8 -3.0970E-02 -5.1455E-03 2.0509E-03 -5.4127E-04 6.0357E-05 -3.2559E-06 8.5462E-08 -8.7952E-10 0.0000E+00 S9 -1.4609E-09 -4.4982E-15 5.5856E-15 -3.5138E-15 1.2490E-15 -2.5434E-16 2.7655E-17 -1.2429E-18 0.0000E+00 S10 1.9982E-06 -4.2323E-11 4.8945E-15 -2.2406E-15 6.5007E-16 -1.0758E-16 9.4772E-18 -3.4490E-19 0.0000E+00

[0125] Table 10

[0126] Fig. 10A The relative illumination curve of the projection lens assembly of Example 5 is shown, which indicates the relative illumination values ​​corresponding to different image heights. Fig. 10B FIG. 2 shows the astigmatism curve of the projection lens group of Example 5, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig. 10A and Fig. 10B It can be seen that the projection lens assembly provided in Example 5 can achieve good imaging quality.

[0127] Example 6

[0128] The following reference Figures 11 to 12B A projection lens assembly according to Embodiment 6 of the present application is described. Fig.11 A schematic structural diagram of a projection lens assembly according to Example 6 of the present application is shown.

[0129] like Fig.11 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0130] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has negative focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is convex. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is convex. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0131] In this example, the total effective focal length f of the projection lens group is 3.57 mm, the total length TTL of the projection lens group is 4.54 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.67 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 38.50°, the aperture value Fno of the projection lens group is 1.78, the relative illumination RI of the projection lens group is 43.64%, and the incident angle MCRA of the maximum chief light on the imaging side is 38.14°.

[0132] Table 11 shows the basic parameters of the projection lens set of Example 6, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0133]

[0134] Table 11

[0135] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -4.8042E-08 2.4888E-11 6.1234E-14 -1.9812E-13 3.1206E-13 -2.3954E-13 7.1104E-14 0.0000E+00 0.0000E+00 S2 -1.9214E-02 2.6413E-02 -1.6809E-01 3.3880E-01 -4.0673E-01 2.4094E-01 -5.3856E-02 0.0000E+00 0.0000E+00 S3 -1.1945E-01 7.4478E-02 -1.6389E-01 2.3350E-01 2.2726E-02 -2.2554E-01 1.0501E-01 0.0000E+00 0.0000E+00 S4 -1.0845E-01 2.1039E-01 -5.9500E-01 1.5014E+00 -2.0083E+00 1.5285E+00 -4.9869E-01 0.0000E+00 0.0000E+00 S5 -1.0549E-01 7.3192E-02 -1.2482E-01 8.5087E-02 1.3704E-02 -2.8769E-02 6.7835E-03 0.0000E+00 0.0000E+00 S6 -1.3679E-01 8.0556E-02 -1.5113E-01 1.7343E-01 -1.3296E-01 6.1312E-02 -1.1783E-02 0.0000E+00 0.0000E+00 S7 -1.1172E-01 6.5610E-02 -1.6539E-01 2.3051E-01 -2.1342E-01 1.2053E-01 -3.6715E-02 4.5971E-03 0.0000E+00 S8 3.8740E-02 -1.4929E-02 1.6393E-03 -5.8915E-05 -2.2139E-06 2.5423E-07 -7.7503E-09 8.1535E-11 0.0000E+00 S9 1.8682E-02 2.2218E-05 -2.4697E-07 5.2939E-10 -5.3983E-13 -1.5396E-16 5.1394E-17 -2.4420E-18 0.0000E+00 S10 -2.3700E-02 6.7356E-03 -1.6064E-03 1.8950E-04 -1.2063E-05 4.1938E-07 -7.4587E-09 5.3012E-11 0.0000E+00

[0136] Table 12

[0137] Fig. 12A The relative illumination curve of the projection lens assembly of Example 6 is shown, which represents the relative illumination values ​​corresponding to different image heights. Fig. 12B FIG. 2 shows the astigmatism curve of the projection lens group of Example 6, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig. 12A and Fig. 12B It can be seen that the projection lens assembly provided in Example 6 can achieve good imaging quality.

[0138] Example 7

[0139] The following reference Figures 13 to 14B A projection lens assembly according to Embodiment 7 of the present application is described. Fig.13 A schematic structural diagram of a projection lens assembly according to Embodiment 7 of the present application is shown.

[0140] like Fig.13 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0141] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has negative focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is convex. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is convex. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0142] In this example, the total effective focal length f of the projection lens group is 3.43 mm, the total length TTL of the projection lens group is 4.40 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.32 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 36.70°, the aperture value Fno of the projection lens group is 1.72, the relative illumination RI of the projection lens group is 46.97%, and the incident angle MCRA of the maximum chief light on the imaging side is 34.24°.

[0143] Table 13 shows the basic parameters of the projection lens set of Example 7, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 14 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0144]

[0145] Table 13

[0146]

[0147] Table 14

[0148] Fig.14A The relative illumination curve of the projection lens assembly of Example 7 is shown, which represents the relative illumination values ​​corresponding to different image heights. Fig. 14B FIG. 2 shows the astigmatism curve of the projection lens group of Example 7, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.14A and Fig. 14B It can be seen that the projection lens assembly provided in Example 7 can achieve good imaging quality.

[0149] Example 8

[0150] The following reference Figures 15 to 16BA projection lens assembly according to Example 8 of the present application is described. Fig.15 A schematic structural diagram of a projection lens assembly according to Example 8 of the present application is shown.

[0151] like Fig.15 As shown, the projection lens group includes, from the imaging side to the image source side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and an image source surface S11.

[0152] The first lens E1 has positive focal power, and its near imaging side surface S1 is convex, and the near image source side surface S2 is concave. The second lens E2 has negative focal power, and its near imaging side surface S3 is convex, and the near image source side surface S4 is concave. The third lens E3 has positive focal power, and its near imaging side surface S5 is convex, and the near image source side surface S6 is convex. The fourth lens E4 has positive focal power, and its near imaging side surface S7 is convex, and the near image source side surface S8 is convex. The fifth lens E5 has negative focal power, and its near imaging side surface S9 is concave, and the near image source side surface S10 is concave. The light from the image source surface S11 passes through each surface S10 to S1 in sequence and is finally projected onto a target object (not shown) in space.

[0153] In this example, the total effective focal length f of the projection lens group is 3.42 mm, the total length TTL of the projection lens group is 4.38 mm, half the diagonal length ImgH of the image source surface S11 of the projection lens group is 2.32 mm, the maximum half field of view angle Semi-FOV of the projection lens group is 36.99°, the aperture value Fno of the projection lens group is 1.71, the relative illumination RI of the projection lens group is 36.41%, and the incident angle MCRA of the maximum chief light on the imaging side is 34.81°.

[0154] Table 15 shows the basic parameters of the projection lens set of Example 8, wherein the units of the radius of curvature, thickness / distance and focal length are all in millimeters (mm). Table 16 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0155]

[0156] Table 15

[0157] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -6.3190E-03 -1.1420E-02 2.3685E-02 -5.9578E-02 6.0341E-02 -3.4353E-02 5.5680E-03 0.0000E+00 0.0000E+00 S2 -5.3835E-02 -9.2616E-03 -4.6750E-02 5.9120E-02 -6.8069E-02 5.0796E-02 -1.6323E-02 0.0000E+00 0.0000E+00 S3 -8.1275E-02 2.1940E-03 -3.3396E-02 2.1541E-01 -2.5223E-01 1.6944E-01 -5.2610E-02 0.0000E+00 0.0000E+00 S4 -6.3034E-02 8.5015E-02 -4.4615E-02 1.1627E-01 2.9274E-02 -1.4511E-01 1.0188E-01 0.0000E+00 0.0000E+00 S5 -9.8979E-02 1.2358E-03 -2.6892E-02 -1.2244E-01 2.3345E-01 -2.0662E-01 5.2199E-02 0.0000E+00 0.0000E+00 S6 -1.5277E-01 5.2251E-02 -8.5133E-02 8.6371E-02 -7.6161E-02 4.0709E-02 -1.1615E-02 0.0000E+00 0.0000E+00 S7 -1.2425E-01 -1.4327E-03 1.4905E-02 -5.9119E-02 8.5636E-02 -6.1357E-02 2.2950E-02 -3.4936E-03 0.0000E+00 S8 2.8487E-02 -4.7228E-02 3.2801E-02 -3.0959E-02 2.1564E-02 -7.9442E-03 1.4101E-03 -9.5680E-05 0.0000E+00 S9 -3.5261E-01 4.4735E-01 -4.0132E-01 2.3020E-01 -7.8071E-02 1.5046E-02 -1.5177E-03 6.2076E-05 0.0000E+00 S10 -1.3034E-01 1.2105E-01 -7.7645E-02 3.0194E-02 -6.9214E-03 9.0092E-04 -6.1215E-05 1.6833E-06 0.0000E+00

[0158] Table 16

[0159] Fig.16A The relative illumination curve of the projection lens assembly of Example 8 is shown, which represents the relative illumination values ​​corresponding to different image heights. Fig. 16BFIG. 8 shows the astigmatism curve of the projection lens group of Example 8, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.16A and Fig. 16B It can be seen that the projection lens set provided in Example 8 can achieve good imaging quality.

[0160] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17.

[0161]

[0162] Table 17

[0163] The present application also provides a projection device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The projection device can be an independent projection device such as a projector, or a projection module integrated in a mobile electronic device such as a mobile phone. The projection device is equipped with the projection lens group described above.

[0164] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A projection lens assembly, characterized in that: Along the optical axis from the imaging side to the image source side, it includes: The first lens has a positive refractive power, the side surface near the image forming part is convex, and the side surface near the image source is concave; a second lens having negative optical power; The third lens has positive power and its image-forming side surface is convex; a fourth lens element having optical power, wherein the side surface near the image forming part is convex; and The fifth lens element has a negative optical power and its side surface near the image formation is concave; At least one of the first lens to the fourth lens is a glass lens; The distance TTL from the image source surface of the projection lens assembly to the near imaging side surface of the first lens on the optical axis satisfies: 4.00 mm ≤ TTL < 4.6 mm; and The effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 1.5<|f3 / f1|≤5.87; The total effective focal length f of the projection lens group and the effective focal length f5 of the fifth lens satisfy: -1.6<f / f5≤-0.28; The curvature radius R1 of the near imaging side surface of the first lens, the curvature radius R2 of the near image source side surface of the first lens, and the effective focal length f1 of the first lens satisfy: 0.69≤(R1+R2) / f1<1.4; The center thickness CT4 of the fourth lens on the optical axis and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 2.95≤CT4 / T34≤5.90; The number of lenses having optical power in the projection lens group is five.

2. The projection lens assembly according to claim 1, characterized in that: The incident angle MCRA of the maximum chief ray on the imaging side satisfies: 1.27≤1 / tan(MCRA)≤2.

02.

3. The projection lens assembly according to claim 1, wherein: The aperture value Fno of the projection lens group satisfies: 1.58≤Fno<1.

9.

4. The projection lens assembly according to claim 1, wherein: The relative illumination RI of the projection lens group satisfies: 36%≤RI≤58.90%.

5. The projection lens assembly according to claim 1, wherein: The distance SAG32 from the intersection of the near image source side of the third lens and the optical axis to the effective radius vertex of the near image source side of the third lens on the optical axis and the distance SAG42 from the intersection of the near image source side of the fourth lens and the optical axis to the effective radius vertex of the near image source side of the fourth lens on the optical axis satisfy: 0.46≤|SAG32 / SAG42|≤1.

32.

6. The projection lens assembly according to claim 1, wherein: The combined focal length f123 of the first lens, the second lens and the third lens and the total effective focal length f of the projection lens group satisfy: 0.9<f123 / f≤1.

54.

7. The projection lens assembly according to claim 1, wherein: The distance TTL from the image source surface of the projection lens group to the near imaging side surface of the first lens on the optical axis and the sum ΣAT of the spacing distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis satisfy: 2.55≤TTL / ΣAT≤3.

91.

8. The projection lens assembly according to claim 1, wherein: The center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the spacing distance T23 between the second lens and the third lens on the optical axis, and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 2.08≤(CT2+CT3+CT4) / (T23+T34)≤4.

47.

9. The projection lens assembly according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis and an edge thickness ET1 of the first lens satisfy: 1.71≤CT1 / ET1≤2.

39.

10. The projection lens assembly according to claim 1, wherein: The Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2>40.

11. The projection lens assembly according to claim 1, wherein: The projection lens group further includes an aperture stop disposed between the imaging side and the first lens.

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