Optical lens group

Abstract

The invention provides an optical lens group, which can provide a light, thin, short and small lens with low cost and excellent optical quality under the condition of shortening the overall length through the concave-convex curved surface arrangement design of the lens, the condition of the refractive index and the design satisfying a certain conditional expression.

Description

Technical Field

[0001] The present invention relates to the field of optics, and in particular to an optical lens assembly. Background Art

[0002] In recent years, the applications of portable electronic products have become increasingly diverse, and their key components—optical lens assemblies—have also developed more diversified. In addition to camera and video recording, they can also be used for 3D sensing technology that can recognize faces or objects.

[0003] There are two main types of 3D sensing technology. The first involves emitting infrared light through an optical lens system, which then reflects off an object's surface. The time it takes for the light to reflect back from different depths is used to calculate the distance (depth) at each location. The other involves the light source forming a specific pattern through an optical lens system. Reflection from different depths of an object distorts the light pattern, allowing the resulting three-dimensional structure to be inferred. Resolution is crucial for clearly discernible projected light, and it must also meet the requirements for thinness and lightness in portable electronic devices. However, manufacturing costs for such optical lens systems are high, and yield rates are low. Therefore, designing low-cost, compact, and optically high-quality optical lens systems is a worthy research topic. Summary of the Invention

[0004] The present invention provides an optical lens assembly which is light, thin, short, low-cost and has excellent optical quality.

[0005] One embodiment of the present invention provides an optical lens assembly comprising, in order from a light-exiting side to a light-incident side along an optical axis, a first lens, a second lens, and a third lens. Each of the first to third lenses includes a light-exiting surface facing the light-exiting side and a light-incident surface facing the light-incident side. The first lens has a negative refractive power. The optical lens assembly comprises only the first to third lenses, is used for projection, and further satisfies the following condition: n2 / (n1-n3)≧14.000.

[0006] One embodiment of the present invention provides an optical lens assembly comprising, in order from a light-exiting side to a light-incident side along an optical axis, a first lens, a second lens, and a third lens. Each of the first to third lenses includes a light-exiting surface facing the light-exiting side and a light-incident surface facing the light-incident side. The first lens has a negative refractive power, and a circumferential region of the light-exiting surface of the first lens is a convex surface. The optical lens assembly comprises only the first to third lenses, is used for projection, and further satisfies the following condition: n3 / |n2-n1|≦170.000.

[0007] In the above optical lens assembly, the embodiment may further selectively satisfy any of the following conditions:

[0008] V3 / V1≧2.200,

[0009] (V3+V2) / V1≧3.300,

[0010] T1 / G12≧5.000,

[0011] (T1+T2) / G23≧4.000,

[0012] (T3+EFL) / Fno≧1.550mm,

[0013] ALT / Gmax≧8.000,

[0014] TTL / Gmin≧26.000,

[0015] EFL / AAG≧6.900,

[0016] (TL-Gavg) / ImgH≧5.000,

[0017] HFOV*Gmin≦1.260 degrees·mm,

[0018] (Tavg+BFL) / Gmax≧4.500,

[0019] (G12+T3) / AAG≧2.750,

[0020] Fno / Gmax≧8.300 mm -1 ,

[0021] HFOV / (T1+BFL)≦9.500 degrees / mm,

[0022] HFOV*(ALT+EFL)≧49.000 degrees·mm,

[0023] Tmax / Gavg≧4.900,

[0024] (T2+T3) / Gmin≧12.500,

[0025] (Tmin+T3) / Gmax≧5.500.

[0026] Wherein, n1 is the nd refractive index of the first lens, n2 is the nd refractive index of the second lens, n3 is the nd refractive index of the third lens, V1 is the Vd Abbe number of the first lens, V2 is the Vd Abbe number of the second lens, V3 is the Vd Abbe number of the third lens, T1 is the thickness of the first lens on the optical axis, T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, EFL is the effective focal length of the optical lens group, Fno is the aperture value of the optical lens group, ALT is the sum of the thicknesses of the three lenses from the first lens to the third lens on the optical axis, TTL is the distance from the light-emitting surface of the first lens to a light-emitting surface on the optical axis, AAG is the sum of the two air gaps from the first lens to the third lens on the optical axis, and TL is the distance from the light-emitting surface of the first lens to the light-entering surface of the third lens. where HFOV is the half field of view of the optical lens group, BFL is the distance on the optical axis from the light incident surface of the third lens to a light emitting surface, Gmax is the maximum value of the air gap of all lenses from the first lens to the third lens on the optical axis, Gmin is the minimum value of the air gap of all lenses from the first lens to the third lens on the optical axis, Gavg is the average value of the air gap of the first lens to the third lens on the optical axis, Tavg is the average value of the lens thickness of all lenses on the optical axis, Tmax is the maximum value of the thickness of the three lenses from the first lens to the third lens on the optical axis, Tmin is the minimum value of the thickness of the three lenses from the first lens to the third lens on the optical axis, and ImgH is the image height of the optical lens group.

[0027] Based on the above, the beneficial effect of the optical lens assembly of the embodiments of the present invention is that, by satisfying the above-mentioned lens concave and convex surface arrangement design, the refractive index conditions, and the design satisfying the above-mentioned conditional formula, the optical lens assembly can provide a light, thin, short, low-cost, and high-optical quality projection imaging lens while shortening the overall length. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A It is a schematic diagram illustrating the application of the optical lens assembly of the present invention to a projection imaging lens.

[0029] Figure 1B FIG. 1 is a front view of an embodiment of a multi-light source structured light generating unit.

[0030] Figure 2 This is a schematic diagram illustrating the surface structure of a lens.

[0031] Figure 3 This is a schematic diagram illustrating the concave-convex structure of a lens and the focus of light.

[0032] Figure 4FIG. 1 is a schematic diagram illustrating the surface structure of a lens of Example 1.

[0033] Figure 5 is a schematic diagram illustrating the surface structure of a lens in Example 2.

[0034] Figure 6 is a schematic diagram illustrating the surface structure of a lens in Example 3.

[0035] Figure 7 FIG. 1 is a schematic diagram of an optical lens assembly according to a first embodiment of the present invention.

[0036] Figure 8 Graphs showing field curvature and distortion of the optical lens assembly of the first embodiment.

[0037] Figure 9 Graph showing longitudinal spherical aberration of the optical lens assembly according to the first embodiment of the present invention.

[0038] Figure 10 FIG. 4 is a schematic diagram of an optical lens assembly according to a second embodiment of the present invention.

[0039] Figure 11 Graphs showing field curvature and distortion of the optical lens assembly of the second embodiment.

[0040] Figure 12 Graph showing longitudinal spherical aberration of the optical lens assembly of the second embodiment.

[0041] Figure 13 FIG. 4 is a schematic diagram of an optical lens assembly according to a third embodiment of the present invention.

[0042] Figure 14 Graphs showing field curvature and distortion of the optical lens assembly of the third embodiment.

[0043] Figure 15 Graph showing longitudinal spherical aberration of the optical lens assembly of the third embodiment.

[0044] Figure 16 FIG. 4 is a schematic diagram of an optical lens assembly according to a fourth embodiment of the present invention.

[0045] Figure 17 Graphs showing field curvature and distortion of the optical lens assembly of the fourth embodiment.

[0046] Figure 18 Graph showing longitudinal spherical aberration of the optical lens assembly of the fourth embodiment.

[0047] Figure 19 FIG. 4 is a schematic diagram of an optical lens assembly according to a fifth embodiment of the present invention.

[0048] Figure 20 Graphs showing field curvature and distortion of the optical lens assembly of the fifth embodiment.

[0049] Figure 21 Graph showing longitudinal spherical aberration of the optical lens assembly of the fifth embodiment.

[0050] Figure 22 FIG. 4 is a schematic diagram of an optical lens assembly according to a sixth embodiment of the present invention.

[0051] Figure 23 Graphs showing field curvature and distortion of the optical lens assembly of the sixth embodiment.

[0052] Figure 24 Graph showing longitudinal spherical aberration of the optical lens assembly of the sixth embodiment.

[0053] Figure 25 FIG. 4 is a schematic diagram of an optical lens assembly according to a seventh embodiment of the present invention.

[0054] Figure 26 Graphs showing field curvature and distortion of the optical lens assembly of the seventh embodiment.

[0055] Figure 27 Graph showing longitudinal spherical aberration of the optical lens assembly of the seventh embodiment.

[0056] Figure 28 1 is a numerical table showing important parameters and their relationship equations of the optical lens assembly according to the first to seventh embodiments of the present invention. DETAILED DESCRIPTION

[0057] Before describing the present invention in detail, the following symbols are clearly indicated in the accompanying drawings: 0: aperture; 1: first lens; 2: second lens; 3: third lens; 8: first protective glass; 9: second protective glass; 10: optical lens group; 11, 21, 31, 81, 91, 110, 410, 510: light exit surface; 12, 22, 32, 82, 92, 120, 320: light incident surface; 20: three-dimensional sensing transmitting end mirror Head; 100, 200, 300, 400, 500: lens; 100a: light-emitting surface; 111, 121, 211, 221, 311, 321, Z1: optical axis area; 112, 122, 212, 222, 312, 322, Z2: circumferential area; 130: assembly part; 211, 212: parallel light; a, b, c: light beam; A1: light-emitting side; A2: light-incident side; CP: center point; CP 1: first center point; CP2: second center point; EL: extension line; I: optical axis; Lc: main light; LCR: light-emitting circle radius; Lm: edge light; M, R: point; OB: optical boundary; P, Pa, Pb, Pc: light source; PM: multi-light source generating unit; TP 1: first transition point; TP2: second transition point; Z3: relay area; ω: maximum half light-emitting angle.

[0058] Please refer to Figure 1A, the light direction of the three-dimensional (3D) sensing transmitting end lens 20 is a plurality of near-infrared lights emitted by a multi-light source generating unit PM, and the multi-light source generating unit PM can be a structured light (StructuredLight). The optical lens group 10 of the embodiment of the present invention generates a plurality of light beams a, b, and c for detecting objects or faces in front of the lens, wherein the range of the exit angle is, for example, within the range of -ω degrees to ω degrees, and ω is the maximum half-light exit angle of the optical lens group 10; the light beams a, b, and c are not limited to any form of light beams, and the direction of the light beams is described in the form of dotted lines. The number of light beams a, b, and c is not limited to 3, and the number can be other numbers not equal to 3 and 1, and Figure 1A In the figure, light beams a, b, and c are shown as representatives, wherein light beams a, b, and c respectively have a chief ray and a marginal ray (not shown). The chief ray and marginal ray of light beam a are approximately parallel to each other; similarly, the chief ray and marginal ray of light beam b are also approximately parallel to each other, and the chief ray and marginal ray of light beam c are also approximately parallel to each other. In detail, Figure 1A The beams a, b, and c are respectively Figure 1B The light sources Pa, Pb, and Pc at different positions emit Figure 1A It can be seen that the light emitted by the light source P at different positions will all be emitted from the optical lens group 10 in a parallel manner after passing through the optical lens group 10, but the emission direction will be different depending on the position. Figure 1A For example, after passing through the optical lens group 10, the light source Pa is emitted from the optical lens group 10 in a direction obliquely to the lower left and in parallel (as shown by light beam a). After passing through the optical lens group 10, the light source Pb at another position is emitted from the optical lens group 10 in a direction directly to the left and in parallel (as shown by light beam b). After passing through the optical lens group 10, the light source Pc at another position is emitted from the optical lens group 10 in a direction obliquely to the upper left and in parallel (as shown by light beam c).

[0059] Please refer to Figure 1B In one embodiment, the multi-light source generating unit PM includes a plurality of near-infrared light sources P arranged in an array. In other embodiments, the near-infrared light sources P may be arranged in a circular arrangement or other arrangements, and the present invention is not limited thereto. The near-infrared light sources P may be infrared laser light sources. The light-emitting surfaces of the near-infrared light sources P form the light-emitting surface 100a of the multi-light source generating unit PM.

[0060] The optical specifications of the embodiments of the present invention described below are determined based on the assumption that reverse tracking of the light direction is a parallel imaging light beam from the light emitting side through the optical lens assembly 10 to the light emitting surface 100a of the multi-light source generating unit PM for focusing and imaging.

[0061] The terms "optical axis region", "circumferential region", "concave surface" and "convex surface" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0062] The optical system of this specification includes at least one lens, which receives the imaging light of the incident optical system that is parallel to the optical axis and within the half field of view (HFOV) angle relative to the optical axis. The imaging light is imaged on the imaging surface through the optical system. The so-called "a lens has a positive refractive power (or negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The so-called "light-emitting surface (or light-incident surface) of the lens" is defined as the specific range through which the imaging light passes through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 2 The light exit surface (or light incident surface) of the lens can be divided into different regions according to different positions, including an optical axis region, a circumferential region, or one or more intermediate regions in some embodiments. These regions will be described in detail below.

[0063] Figure 2 is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: the center point and the transition point. The center point of the lens surface is an intersection of the surface and the optical axis I. Figure 2 As shown in the example, the first center point CP 1 is located at the light exit surface 110 of the lens 100, and the second center point CP2 is located at the light incident surface 120 of the lens 100. A conversion point is a point on the lens surface, and the tangent of the point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the radially outermost edge ray Lm passing through the lens surface intersects with the lens surface. All conversion points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, if a single lens surface has multiple conversion points, the conversion points are named in order from the first conversion point in the radial outward direction. For example, the first conversion point TP 1 (closest to the optical axis I), the second conversion point TP2 (such as Figure 5 as shown) and the Nth conversion point (farthest from the optical axis I).

[0064] The range from the center point to the first transition point TP1 is defined as the optical axis region, where the optical axis region includes the center point. The region extending radially outward from the Nth transition point, farthest from the optical axis I, to the optical boundary OB is defined as the circumferential region. In some embodiments, intermediate regions may be included between the optical axis region and the circumferential region. The number of intermediate regions depends on the number of transition points.

[0065] When a light ray parallel to the optical axis I passes through an area, if the ray is deflected toward the optical axis I and its intersection with the optical axis I is located at the light entrance side A2 of the lens, the area is considered convex. When a light ray parallel to the optical axis I passes through an area, if the extension of the ray intersects the optical axis I at the light exit side A1 of the lens, the area is considered concave.

[0066] In addition, see Figure 2 Lens 100 may also include an assembly portion 130 extending radially outward from optical boundary OB. Assembly portion 130 is generally used to assemble lens 100 to a corresponding element in an optical system (not shown). Imaging light does not reach assembly portion 130. The structure and shape of assembly portion 130 are merely illustrative of the present invention and do not limit the scope of the present invention. Assembly portion 130 of the lens discussed below may be partially or entirely omitted from the drawings.

[0067] See also Figure 3 , define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 3 As shown, after passing through the optical axis region Z1, the parallel light 211 intersects the optical axis I at the light incident side A2 of the lens 200. That is, the focus of the parallel light 211 passing through the optical axis region Z1 is located at point R on the light incident side A2 of the lens 200. Since the light intersects the optical axis I at the light incident side A2 of the lens 200, the optical axis region Z1 is a convex surface. Conversely, the parallel light 212 diverges after passing through the circumferential region Z2. Figure 3 As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects the optical axis I at the light exit side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at point M on the light exit side A1 of the lens 200. Since the extended line EL of the light intersects the optical axis I at the light exit side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 3 In the lens 200 shown, the first transition point TP 1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP 1 is the boundary point from the convex surface to the concave surface.

[0068] Alternatively, the convexity of the optical axis region can be determined using a method commonly used by those skilled in the art. This involves determining the convexity of the lens' optical axis region based on the sign of the paraxial radius of curvature (abbreviated as the R value). R values ​​are commonly used in optical design software such as Zemax or CodeV. R values ​​are also commonly found in lens data sheets within optical design software. For the light-exiting surface, a positive R value indicates that the optical axis region of the light-exiting surface is convex; a negative R value indicates that the optical axis region of the light-exiting surface is concave. Conversely, for the light-incident surface, a positive R value indicates that the optical axis region of the light-incident surface is concave; a negative R value indicates that the optical axis region of the light-incident surface is convex. The results of this method are consistent with the previously described method of determining the convexity of the lens' optical axis region based on the intersection of a ray / ray extension line with the optical axis. This method uses the focus of a ray parallel to the optical axis located on either the light-exiting or light-incident side of the lens to determine the convexity of the lens' optical axis. The terms “a region is convex (or concave)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0069] Figures 4 to 6 Examples are provided for determining the surface shape and area boundaries of lens areas in various situations, including the aforementioned optical axis area, circumferential area, and relay area.

[0070] Figure 4 is a radial cross-sectional view of the lens 300. Figure 4 , the light incident surface 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis area Z1 and the circumferential area Z2 of the light incident surface 320 of the lens 300 are as follows: Figure 4 The R value of the light incident surface 320 is positive (ie, R>0), and therefore, the optical axis region Z1 is a concave surface.

[0071] Generally speaking, the shape of each area bounded by a transition point is opposite to that of the adjacent areas. Therefore, the transition point can be used to define the transition of the surface shape, that is, from concave to convex or from convex to concave. Figure 4 In the figure, since the optical axis area Z1 is a concave surface, the surface shape changes at the transition point TP1, so the circumferential area Z2 is a convex surface.

[0072] Figure 5 is a radial cross-sectional view of the lens 400. Figure 5 The light-emitting surface 410 of the lens 400 has a first transition point TP1 and a second transition point TP2. The area between the optical axis I and the first transition point TP1 is defined as the optical axis region Z1 of the light-emitting surface 410. The R value of the light-emitting surface 410 is positive (i.e., R>0), and therefore, the optical axis region Z1 is convex.

[0073] The area between the second transition point TP2 and the optical boundary OB of the light-emitting surface 410 of the lens 400 is defined as the circumferential area Z2. The circumferential area Z2 of the light-emitting surface 410 is also convex. In addition, the area between the first transition point TP1 and the second transition point TP2 is defined as the intermediate area Z3. The intermediate area Z3 of the light-emitting surface 410 is concave. Figure 5 The light-emitting surface 410 includes, radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and the first turning point TP1, an intermediate region Z3 between the first turning point TP1 and the second turning point TP2, and a circumferential region Z2 between the second turning point TP2 and the optical boundary OB of the light-emitting surface 410 of the lens 400. Since the optical axis region Z1 is convex, the surface shape changes from the first turning point TP1 to concave, so the intermediate region Z3 is concave. Since the surface shape changes again from the second turning point TP2 to convex, the circumferential region Z2 is convex.

[0074] Figure 6 is a radial cross-sectional view of the lens 500. The light exit surface 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the light exit surface 510 of the lens 500, the optical axis area is defined as 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and the circumferential area is defined as 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface. Figure 6 In the illustrated lens 500, the optical axis region Z1 of the light-emitting surface 510 is defined as the distance from the optical axis I to 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 surface. The R value of this light-emitting surface 510 is positive (i.e., R > 0), and therefore, the optical axis region Z1 is convex. Because the light-emitting surface 510 of the lens 500 lacks a transition point, the circumferential region Z2 of the light-emitting surface 510 is also convex. The lens 500 may further include an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0075] First embodiment:

[0076] Figure 7 is a schematic diagram of an optical lens assembly according to a first embodiment of the present invention, and Figure 9 and Figure 10 The longitudinal spherical aberration and various aberration diagrams of the optical lens assembly of the first embodiment are shown. Figure 7The optical lens assembly 10 of the first embodiment of the present invention includes, in order from the light-emitting side A1 to the light-entering side A2, a first protective glass 8, an aperture O, a second protective glass 9, a first lens 1, a second lens 2, and a third lens 3 along the optical axis I of the optical lens assembly 10. When multiple near-infrared lights are emitted from the light-emitting surface 100a of the multi-light-source generating unit PM and enter the optical lens assembly 10, they sequentially pass through the third lens 3, the second lens 2, the first lens 1, the second protective glass 9, the first protective glass 8, and the aperture O, generating multiple light beams that exit the optical lens assembly 10. It should be noted that the light-entering side A2 is the side facing the multi-light-source generating unit PM, while the opposite side is the light-emitting side A1.

[0077] In this embodiment, to ensure that the optical lens assembly 10 of the present invention maintains a certain optical quality under various environments, a first protective glass 8 and a second protective glass 9 are disposed sequentially from the light-emitting side A1 to the light-entering side A2. Furthermore, to enhance the optical quality of the optical lens assembly 10, a cement having the same refractive index as the first and second protective glasses 8, 9 is disposed between the first and second protective glasses 8, 9. The aperture 0 is bonded to the first protective glass 8. Furthermore, the first through third lenses 1, 3 are all made of plastic. However, in other embodiments, the materials of the first through third lenses 1, 3 are not limited to this material.

[0078] In this embodiment, the first protective glass 8, the second protective glass 9, the first lens 1, the second lens 2, and the third lens 3 of the optical lens assembly 10 each have a light-emitting surface 81, 91, 11, 21, 31 facing the light-emitting side A1 and allowing a plurality of near-infrared rays to pass therethrough, and a light-entering surface 82, 92, 12, 22, 32 facing the light-entering side A2 and allowing a plurality of near-infrared rays to pass therethrough.

[0079] The first lens element 1 has a negative refractive power. The optical axis region 111 of the light-emitting surface 11 of the first lens element 1 is convex, and its circumferential region 112 is also convex. The optical axis region 121 of the light-incident surface 12 of the first lens element 1 is concave, and its circumferential region 122 is also concave. In this embodiment, both the light-emitting surface 11 and the light-incident surface 12 of the first lens element 1 are aspheric surfaces, but the present invention is not limited to this.

[0080] The second lens element 2 has a positive refractive power. The optical axis region 211 of the light-emitting surface 21 of the second lens element 2 is convex, and its circumferential region 212 is also convex. The optical axis region 221 of the light-incident surface 22 of the second lens element 2 is concave, and its circumferential region 222 is also concave. In this embodiment, both the light-emitting surface 21 and the light-incident surface 22 of the second lens element 2 are aspherical surfaces, but the present invention is not limited to this.

[0081] The third lens element 3 has a positive refractive power. The optical axis region 311 of the light-emitting surface 31 of the third lens element 3 is convex, and its circumferential region 312 is also convex. The optical axis region 321 of the light-incident surface 32 of the third lens element 3 is convex, and its circumferential region 322 is also convex. In this embodiment, both the light-emitting surface 31 and the light-incident surface 32 of the third lens element 3 are aspherical surfaces, but the present invention is not limited to this.

[0082] Other detailed optical data of the first embodiment are shown in Table 1. The optical lens assembly 10 of the first embodiment has an effective focal length (EFL) of 2.695 millimeters (mm), a half field of view (HFOV) of 10.907 degrees, a distance DL of 3.321 mm, an aperture value (F-number, Fno) of 2.264, and an image height (ImgH) of 0.500 mm. The distance DL refers to the distance from the light-emitting surface 81 of the first protective glass 8 to the light-emitting surface 100a along the optical axis I. The "aperture value" herein is calculated based on the principle of reversibility of light, assuming that aperture 0 is the entrance pupil.

[0083] Table 1

[0084]

[0085] In this embodiment, the optical lens assembly 10 only includes the first lens 1 to the third lens 3 described above.

[0086] Furthermore, in this embodiment, all six surfaces (light exit surfaces 11, 21, 31) and light incident surfaces 12, 22, 32) of the first lens element 1, the second lens element 2, and the third lens element 3 are aspherical surfaces. Of these, the light exit surfaces 11, 21, 31 and the light incident surfaces 12, 22, 32 are typical even-order aspherical surfaces. These aspherical surfaces are defined according to the following formula:

[0087]

[0088] in:

[0089] Y: the distance between the point on the aspheric curve and the optical axis I;

[0090] Z: Depth of the aspheric surface (the vertical distance between the point Y from the optical axis I on the aspheric surface and the tangent plane tangent to the vertex on the optical axis I of the aspheric surface);

[0091] R: radius of curvature of the lens surface at the near optical axis I;

[0092] K: conic coefficient;

[0093] a i : i-th order aspheric coefficient.

[0094] The various aspheric coefficients in formula (1) from the light-exiting surface 11 of the first lens 1 to the light-incident surface 32 of the third lens 3 are shown in Table 2. Column number 11 in Table 2 represents the aspheric coefficient of the light-exiting surface 11 of the first lens 1, and the same applies to the other columns. In this embodiment and the following embodiments, the conic coefficient K is 0, and the second-order aspheric coefficient a2 is 0.

[0095] Table 2

[0096]

[0097]

[0098] In addition, the relationship between the important parameters of the optical lens assembly 10 of the first embodiment is as follows: Figure 28 shown.

[0099] CG1 is the thickness of the first protective glass 8 on the optical axis I; CG2 is the thickness of the second protective glass 9 on the optical axis I; T1 is the thickness of the first lens 1 on the optical axis I; T2 is the thickness of the second lens 2 on the optical axis I; T3 is the thickness of the third lens 3 on the optical axis I.

[0100] CG12 is the distance from the light incident surface 82 of the first protective glass 8 to the light exit surface 91 of the second protective glass 9 on the optical axis I; CG21 is the distance from the light incident surface 92 of the second protective glass 9 to the light exit surface 11 of the first lens 1 on the optical axis I.

[0101] G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I; G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I.

[0102] AAG is the sum of the two air gaps between the first lens 1 and the third lens 3 on the optical axis I, that is, the sum of G12 and G23; ALT is the sum of the three lens thicknesses between the first lens 1 and the third lens 3 on the optical axis I, that is, the sum of T1, T2, and T3; TL is the distance between the light-emitting surface 11 of the first lens 1 and the light-entering surface 32 of the third lens 3 on the optical axis I; TTL is the distance between the light-emitting surface 11 of the first lens 1 and the light-emitting surface 100a on the optical axis I; DL is the distance between the optical element closest to the light-emitting side A1 and the light-emitting surface 100a on the optical axis I; BFL is the distance between the light-entering surface 32 of the third lens 3 and the light-emitting surface 100a on the optical axis I; HFOV is the half viewing angle of the optical lens group 10, which is the maximum half light-emitting angle ω of the optical lens group 10 according to the principle of reversibility of light; EFL is the effective focal length of the optical lens group 10; LCR (Light circle radius) is the light-emitting circle radius (marked as LCR, as shown in FIG. Figure 1B ), is the radius of the minimum circumscribed circle of the light-emitting surface 100a of the multi-light-source generating unit PM; Fno is the aperture value of the optical lens assembly 10, which is the aperture value calculated based on the principle of reversibility of light for the effective aperture of the light beam emitted by the optical lens assembly 10. In the embodiment of the present invention, this is the aperture value calculated by considering aperture 0 as the entrance pupil.

[0103] Tavg is the average lens thickness of all lenses on the optical axis I; Gavg is the average air gap between the first lens 1 to the third lens 3 on the optical axis I; Tmax is the maximum value of the three lens thicknesses between the first lens 1 to the third lens 3 on the optical axis I; Gmax is the maximum value of the air gap between all lenses among the first lens 1 to the third lens 3 on the optical axis I; Tmin is the minimum value of the three lens thicknesses between the first lens 1 to the third lens 3 on the optical axis I; Gmin is the minimum value of the air gap between all lenses among the first lens 1 to the third lens 3 on the optical axis I.

[0104] In addition, define:

[0105] f1 is the focal length of the first lens 1; f2 is the focal length of the second lens 2; f3 is the focal length of the third lens 3; n1 is the nd refractive index of the first lens 1; n2 is the nd refractive index of the second lens 2; n3 is the nd refractive index of the third lens 3; V1 is the Vd Abbe number (also known as the dispersion coefficient) of the first lens 1; V2 is the Vd Abbe number of the second lens 2; V3 is the Vd Abbe number of the third lens 3.

[0106] The lens material parameters disclosed in the optical data tables of the embodiments are formatted in the International Glass Code format of refractive index (nd) and Abbe number (Vd), allowing those skilled in the art to understand the specific material implementation. nd is the material's refractive index at the d-helium yellow line at 587.56 nm, and Vd is calculated based on the material's refractive index at wavelengths d, F, and C in the Fraunhofer spectrum. The focal length values ​​disclosed in the optical data tables of the embodiments are calculated based on the refractive index of the optical system's implementation wavelength. Since the primary wavelength of the embodiments of the present invention is 940 nm, the focal length values ​​of the present invention are calculated based on the material's refractive index at 940 nm.

[0107] like Figure 8 and Figure 9 , Figure 9 The diagrams illustrate the longitudinal spherical aberration of the first embodiment at the light emitting surface 100a when the wavelengths are 931nm, 940nm and 949nm. Figure 8 and Figure 9 The figures respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the light emitting surface 100a of the multi-light source generating unit PM of the first embodiment when the wavelength is 931nm, 940nm and 949nm. Figure 8 The diagram of FIG1 illustrates the distortion aberration of the first embodiment on the light emitting surface 100a of the multi-light source generating unit PM when the wavelength is 931nm, 940nm and 949nm. Figure 9 As shown, the curves for each wavelength are very close and approach the center, indicating that the off-axis light rays of different heights for each wavelength are concentrated near the imaging point. The deviation of the curves for each wavelength indicates that the deviation of the imaging points of the off-axis light rays of different heights is controlled within a range of -20.0 μm to 4.0 μm. Therefore, the first embodiment significantly improves spherical aberration of the same wavelength. In addition, the distances between the three representative wavelengths are also very close, indicating that the imaging positions of the light rays of different wavelengths are relatively concentrated, thereby significantly improving chromatic aberration.

[0108] exist Figure 8 In the field curvature aberration diagram, the focal length variation of the three representative wavelengths within the entire field of view falls within the range of -2.0μm to 6.0μm, indicating that the optical system of the first embodiment can effectively eliminate aberrations. Figure 8The distortion diagram shows that the distortion of the first embodiment is maintained within the range of -5.0% to 0%, indicating that the distortion of the first embodiment meets the optical quality requirements of the optical system. This indicates that the first embodiment can still provide better optical quality than conventional optical lens assemblies even when the distance DL is shortened to approximately 3.321 mm. Furthermore, the first embodiment has the shortest lens length TTL, making it easier to manufacture. Therefore, the optical lens assembly 10 of the present invention also has a higher manufacturing process yield.

[0109] Second embodiment:

[0110] Figure 10 is a schematic diagram of an optical lens assembly according to a second embodiment of the present invention, and Figure 11 and Figure 12 The longitudinal spherical aberration and various aberration diagrams of the optical lens assembly of the second embodiment are shown. Figure 10 The second embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, with only slight differences in the optical data, aspheric coefficients, and parameters between lenses 1, 2, and 3. It should be noted that for clarity of illustration, Figure 10 The reference numerals of the optical axis area and the circumferential area having similar surface shapes to those of the first embodiment are omitted.

[0111] The first lens 1 has a negative refractive power. The optical axis region 111 of the light exit surface 11 of the first lens 1 is convex, and the circumferential region 112 thereof is convex. The optical axis region 121 of the light incident surface 12 of the first lens 1 is concave, and the circumferential region 122 thereof is concave.

[0112] The second lens 2 has a positive refractive power. The optical axis region 211 of the light exit surface 21 of the second lens 2 is convex, and the circumferential region 212 thereof is convex. The optical axis region 221 of the light incident surface 22 of the second lens 2 is concave, and the circumferential region 222 thereof is concave.

[0113] The third lens element 3 has a negative refractive power. The optical axis region 311 of the light exit surface 31 of the third lens element 3 is concave, and the circumferential region 312 thereof is convex. The optical axis region 321 of the light incident surface 32 of the third lens element 3 is concave, and the circumferential region 322 thereof is also concave.

[0114] Detailed optical data of the optical lens assembly 10 of the second embodiment are shown in Table 3. The effective focal length (EFL) of the optical lens assembly 10 of the second embodiment is 3.080 mm, the half field of view (HFOV) is 8.821 degrees, the distance DL is 3.765 mm, the aperture value (Fno) is 2.588, and the image height (ImgH) of the optical lens assembly 10 is 0.500 mm.

[0115] Table 3

[0116]

[0117] Table 4 shows the aspheric coefficients of the second embodiment from the light exit surface 11 of the first lens 1 to the light incident surface 32 of the third lens 3 in formula (1).

[0118] Table 4

[0119]

[0120] In addition, the relationship between the important parameters of the optical lens assembly 10 of the second embodiment is as follows: Figure 28 shown.

[0121] like Figure 12 As shown in FIG, the imaging point deviation of off-axis light at different heights is controlled in the range of -16.0 μm to 16.0 μm. Figure 11 In the field curvature diagram, the focal length variation of the three representative wavelengths within the entire field of view ranges from -2.0μm to 12.0μm. Figure 11 The distortion diagram shows that the distortion of the second embodiment is maintained within the range of 0% to 4.0%. This shows that the second embodiment can still provide better optical quality than the first embodiment even when the distance DL is extended to 3.765 mm.

[0122] From the above description, it can be seen that the advantage of the second embodiment over the first embodiment is that the distortion aberration of the second embodiment is better than that of the first embodiment.

[0123] Third embodiment:

[0124] Figure 13 is a schematic diagram of an optical lens assembly according to a third embodiment of the present invention, and Figure 14 and Figure 15 The longitudinal spherical aberration and various aberration diagrams of the optical lens assembly of the third embodiment are shown. Figure 13 The third embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, with only slight differences in the optical data, aspheric coefficients, and parameters between lenses 1, 2, and 3. It should be noted that for clarity of illustration, Figure 13 The reference numerals of the optical axis area and the circumferential area having similar surface shapes to those of the first embodiment are omitted.

[0125] The first lens 1 has a negative refractive power. The optical axis region 111 of the light exit surface 11 of the first lens 1 is convex, and the circumferential region 112 thereof is convex. The optical axis region 121 of the light incident surface 12 of the first lens 1 is concave, and the circumferential region 122 thereof is concave.

[0126] The second lens 2 has a negative refractive power. The optical axis region 211 of the light exit surface 21 of the second lens 2 is convex, and the circumferential region 212 thereof is convex. The optical axis region 221 of the light incident surface 22 of the second lens 2 is concave, and the circumferential region 222 thereof is concave.

[0127] The third lens element 3 has a positive refractive power. The optical axis region 311 of the light exit surface 31 of the third lens element 3 is convex, and the circumferential region 312 thereof is also convex. The optical axis region 321 of the light incident surface 32 of the third lens element 3 is convex, and the circumferential region 322 thereof is also convex.

[0128] Detailed optical data of the optical lens assembly 10 of the third embodiment are shown in Table 5. The effective focal length (EFL) of the optical lens assembly 10 of the third embodiment is 3.804 mm, the half field of view (HFOV) is 7.701 degrees, the distance DL is 5.853 mm, the aperture value (Fno) is 3.197, and the image height (ImgH) of the optical lens assembly 10 is 0.500 mm.

[0129] Table 5

[0130]

[0131] Table 6 shows the aspheric coefficients of the third embodiment from the light exit surface 11 of the first lens 1 to the light incident surface 32 of the third lens 3 in formula (1).

[0132] Table 6

[0133]

[0134] In addition, the relationship between the important parameters of the optical lens assembly 10 of the third embodiment is as follows: Figure 27 shown.

[0135] like Figure 15 As shown in FIG, the imaging point deviation of off-axis light at different heights is controlled in the range of -13.0 μm to 4.0 μm. Figure 14 In the field curvature diagram, the focal length variation of the three representative wavelengths within the entire field of view ranges from -10.0μm to 20.0μm. Figure 14 The distortion diagram shows that the distortion of the third embodiment is maintained within the range of -3.0% to 0.5%. This shows that the third embodiment can still provide better optical quality compared to the first embodiment even when the distance DL is extended to approximately 5.853 mm.

[0136] From the above description, it can be seen that the advantages of the third embodiment over the first embodiment are that the distortion aberration and longitudinal spherical aberration of the third embodiment are better than those of the first embodiment.

[0137] Fourth embodiment:

[0138] Figure 16 is a schematic diagram of an optical lens assembly according to a fourth embodiment of the present invention, and Figure 17 and Figure 18 The longitudinal spherical aberration and various aberration diagrams of the optical lens assembly of the fourth embodiment are shown. Figure 16 The fourth embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, with only slight differences in the optical data, aspheric coefficients, and parameters between lenses 1, 2, and 3. It should be noted that for clarity of illustration, Figure 16 The reference numerals of the optical axis area and the circumferential area having similar surface shapes to those of the first embodiment are omitted.

[0139] The first lens 1 has a negative refractive power. The optical axis region 111 of the light exit surface 11 of the first lens 1 is convex, and the circumferential region 112 thereof is convex. The optical axis region 121 of the light incident surface 12 of the first lens 1 is concave, and the circumferential region 122 thereof is concave.

[0140] The second lens 2 has a negative refractive power. The optical axis region 211 of the light exit surface 21 of the second lens 2 is convex, and the circumferential region 212 thereof is convex. The optical axis region 221 of the light incident surface 22 of the second lens 2 is concave, and the circumferential region 222 thereof is concave.

[0141] The third lens element 3 has a negative refractive power. The optical axis region 311 of the light exit surface 31 of the third lens element 3 is convex, and the circumferential region 312 thereof is also convex. The optical axis region 321 of the light incident surface 32 of the third lens element 3 is convex, and the circumferential region 322 thereof is also convex.

[0142] Detailed optical data of the optical lens assembly 10 of the fourth embodiment are shown in Table 7. The effective focal length (EFL) of the optical lens assembly 10 of the fourth embodiment is 10.024 mm, the half field of view (HFOV) is 3.215 degrees, the distance DL is 12.996 mm, the aperture value (Fno) is 8.423, and the image height (ImgH) of the optical lens assembly 10 is 0.500 mm.

[0143] Table 7

[0144]

[0145]

[0146] Table 8 shows the aspheric coefficients of the fourth embodiment from the light exit surface 11 of the first lens 1 to the light incident surface 32 of the third lens 3 in formula (1).

[0147] Table 8

[0148]

[0149] In addition, the relationship between the important parameters of the optical lens assembly 10 of the fourth embodiment is as follows: Figure 28 shown.

[0150] like Figure 18 As shown in FIG, the imaging point deviation of off-axis light at different heights is controlled in the range of -30.0 μm to 30.0 μm. Figure 17 In the field curvature diagram, the focal length variation of the three representative wavelengths in the entire field of view ranges from -4.0μm to 16.0μm. Figure 17 The distortion diagram shows that the distortion of the fourth embodiment is maintained within the range of -8.0% to 0%. This shows that the fourth embodiment can still provide better optical quality compared to the first embodiment even when the distance DL is extended to approximately 12.996 mm.

[0151] Fifth embodiment:

[0152] Figure 19 is a schematic diagram of an optical lens assembly according to a fifth embodiment of the present invention, and Figure 20 and Figure 21 The longitudinal spherical aberration and various aberration diagrams of the optical lens assembly of the fifth embodiment are shown. Figure 19 The fifth embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, with only slight differences in the optical data, aspheric coefficients, and parameters between lenses 1, 2, and 3. It should be noted that for clarity of illustration, Figure 19 The reference numerals of the optical axis area and the circumferential area having similar surface shapes to those of the first embodiment are omitted.

[0153] Detailed optical data of the optical lens assembly 10 of the fifth embodiment are shown in Table 9. The effective focal length (EFL) of the optical lens assembly 10 of the fifth embodiment is 2.976 mm, the half field of view (HFOV) is 9.682 degrees, the distance DL is 3.780 mm, the aperture value (Fno) is 2.501, and the image height (ImgH) of the optical lens assembly 10 is 0.500 mm.

[0154] Table 9

[0155]

[0156] Table 10 shows the aspheric coefficients of the fifth embodiment from the light exit surface 11 of the first lens 1 to the light incident surface 32 of the third lens 3 in formula (1).

[0157] Table 10

[0158]

[0159] In addition, the relationship between the important parameters of the optical lens assembly 10 of the fifth embodiment is as follows: Figure 28 shown.

[0160] like Figure 21 As shown in FIG, the imaging point deviation of off-axis light at different heights is controlled in the range of -35.0 μm to 10.0 μm. Figure 20 In the field curvature diagram, the focal length variation of the three representative wavelengths within the entire field of view ranges from -3.0μm to 9.0μm. Figure 20 The distortion diagram shows that the distortion of the fifth embodiment is maintained in the range of -1.6% to 0.2%. This shows that the fifth embodiment can still provide better optical quality compared to the first embodiment even when the distance DL is extended to approximately 3.780 mm.

[0161] From the above description, it can be seen that the fifth embodiment has an advantage over the first embodiment in that the distortion aberration of the fifth embodiment is better than that of the first embodiment.

[0162] Sixth embodiment:

[0163] Figure 22 is a schematic diagram of an optical lens assembly according to a sixth embodiment of the present invention, and Figure 23 and Figure 24 This is a diagram of the longitudinal spherical aberration and various aberrations of the optical lens assembly of the sixth embodiment. Figure 22 The sixth embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, with only minor differences in the optical data, aspheric coefficients, and parameters between lenses 1, 2, and 3. It should be noted that for clarity of illustration, Figure 22 The reference numerals of the optical axis area and the circumferential area having similar surface shapes to those of the first embodiment are omitted.

[0164] The first lens 1 has a negative refractive power. The optical axis region 111 of the light exit surface 11 of the first lens 1 is convex, and the circumferential region 112 thereof is convex. The optical axis region 121 of the light incident surface 12 of the first lens 1 is concave, and the circumferential region 122 thereof is concave.

[0165] The second lens 2 has a negative refractive power. The optical axis region 211 of the light exit surface 21 of the second lens 2 is convex, and the circumferential region 212 thereof is convex. The optical axis region 221 of the light incident surface 22 of the second lens 2 is concave, and the circumferential region 222 thereof is concave.

[0166] The third lens element 3 has a positive refractive power. The optical axis region 311 of the light exit surface 31 of the third lens element 3 is convex, and the circumferential region 312 thereof is also convex. The optical axis region 321 of the light incident surface 32 of the third lens element 3 is convex, and the circumferential region 322 thereof is also convex.

[0167] Detailed optical data of the optical lens assembly 10 of the sixth embodiment are shown in Table 11. The effective focal length (EFL) of the optical lens assembly 10 of the sixth embodiment is 3.575 mm, the half field of view (HFOV) is 8.298 degrees, the distance DL is 4.573 mm, the aperture value (Fno) is 3.004, and the image height (ImgH) of the optical lens assembly 10 is 0.500 mm.

[0168] Table 11

[0169]

[0170]

[0171] Table 12 shows the aspheric coefficients of the sixth embodiment from the light exit surface 11 of the first lens 1 to the light incident surface 32 of the third lens 3 in formula (1).

[0172] Table 12

[0173]

[0174] In addition, the relationship between the important parameters of the optical lens assembly 10 of the sixth embodiment is as follows: Figure 28 shown.

[0175] like Figure 24 As shown in FIG, the imaging point deviation of off-axis light at different heights is controlled in the range of -50.0μm to 20.0μm. Figure 23 In the field curvature diagram, the focal length variation of the three representative wavelengths in the entire field of view ranges from -4.5μm to 3.5μm. Figure 23 The distortion diagram shows that the distortion of the sixth embodiment is maintained within the range of -4.5% to 0%. This indicates that the sixth embodiment can still provide better optical quality compared to the first embodiment even when the distance DL is extended to approximately 3.780 mm.

[0176] From the above description, it can be seen that the advantages of the sixth embodiment over the first embodiment are: the distortion aberration of the sixth embodiment is better than that of the first embodiment, and the difference in field curvature aberration between the sixth embodiment and the first embodiment is not much.

[0177] Seventh embodiment:

[0178] Figure 25 is a schematic diagram of an optical lens assembly according to a seventh embodiment of the present invention, and Figure 26 and Figure 27 The longitudinal spherical aberration and various aberration diagrams of the optical lens assembly of the seventh embodiment are shown. Figure 25The seventh embodiment of the optical lens assembly 10 of the present invention is substantially similar to the first embodiment, with only slight differences in the optical data, aspheric coefficients, and parameters between lenses 1, 2, and 3. It should be noted that for clarity of illustration, Figure 25 The reference numerals of the optical axis area and the circumferential area having similar surface shapes to those of the first embodiment are omitted.

[0179] The first lens 1 has a negative refractive power. The optical axis region 111 of the light exit surface 11 of the first lens 1 is convex, and the circumferential region 112 thereof is convex. The optical axis region 121 of the light incident surface 12 of the first lens 1 is concave, and the circumferential region 122 thereof is concave.

[0180] The second lens 2 has a positive refractive power. The optical axis region 211 of the light exit surface 21 of the second lens 2 is convex, and the circumferential region 212 thereof is convex. The optical axis region 221 of the light incident surface 22 of the second lens 2 is concave, and the circumferential region 222 thereof is concave.

[0181] The third lens element 3 has a negative refractive power. The optical axis region 311 of the light exit surface 31 of the third lens element 3 is convex, and the circumferential region 312 thereof is convex. The optical axis region 321 of the light incident surface 32 of the third lens element 3 is concave, and the circumferential region 322 thereof is concave.

[0182] Detailed optical data of the optical lens assembly 10 of the seventh embodiment are shown in Table 13. The effective focal length (EFL) of the optical lens assembly 10 of the seventh embodiment is 5.098 mm, the half field of view (HFOV) is 5.794 degrees, the distance DL is 4.388 mm, the aperture value (Fno) is 4.284, and the image height (ImgH) of the optical lens assembly 10 is 0.500 mm.

[0183] Table 13

[0184]

[0185] Table 14 shows the aspheric coefficients of the seventh embodiment from the light exit surface 11 of the first lens 1 to the light entrance surface 32 of the third lens 3 in formula (1).

[0186] Table 14

[0187]

[0188]

[0189] In addition, the relationship between the important parameters of the optical lens assembly 10 of the seventh embodiment is as follows: Figure 28 shown.

[0190] like Figure 27As shown in FIG, the imaging point deviation of off-axis light at different heights is controlled in the range of -7.0 μm to 7.0 μm. Figure 26 In the field curvature diagram, the focal length variation of the three representative wavelengths within the entire field of view ranges from -9.0μm to 10.0μm. Figure 26 The distortion diagram shows that the distortion of the seventh embodiment is maintained within the range of -6.5% to 0%. This indicates that the seventh embodiment can still provide better optical quality compared to the first embodiment even when the distance DL is extended to approximately 3.780 mm.

[0191] It can be seen from the above description that the advantage of the seventh embodiment over the first embodiment is that the longitudinal spherical aberration of the seventh embodiment is better than that of the first embodiment.

[0192] Also refer to Figure 28 , Figure 28 It is a table diagram of various optical parameters of the first embodiment to the seventh embodiment.

[0193] In order to shorten the overall length of the optical lens assembly 10 of the embodiment of the present invention while ensuring optical quality, while also considering the difficulty of manufacturing, reducing the air gap between lenses or appropriately shortening the lens thickness are used as means. If the numerical limits of the following conditional expression are met, the embodiment of the present invention can have a better configuration.

[0194] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: n2 / (n1-n3)≧14.000, wherein a preferred range is 22.000≧n2 / (n1-n3)≧14.000.

[0195] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: n3 / |n2-n1|≦170.000, wherein a preferred range is 21.500≦n3 / |n2-n1|≦170.000.

[0196] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: V3 / V1≧2.200, wherein a preferred range is 2.800≧V3 / V1≧2.200.

[0197] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (V3+V2) / V1≧3.300, wherein a preferred range is 4.400≧(V3+V2) / V1≧3.300.

[0198] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: T1 / G12≧5.000, wherein a preferred range is 11.000≧T1 / G12≧5.000.

[0199] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (T1+T2) / G23≧4.000, wherein a preferred range is 17.500≧(T1+T2) / G23≧4.000.

[0200] In the optical lens assembly 10 of the embodiment of the present invention, the following condition is met: (T3+EFL) / Fno≧1.550 mm, wherein a preferred range is 2.500 mm≧(T3+EFL) / Fno≧1.550 mm.

[0201] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: ALT / Gmax≧8.000, wherein a preferred range is 75.000≧ALT / Gmax≧8.000.

[0202] In the optical lens assembly 10 of the embodiment of the present invention, the following condition is met: TTL / Gmin≧26.000, wherein the preferred range is 147.000≧TTL / Gmin≧26.000.

[0203] In the optical lens assembly 10 of the embodiment of the present invention, the following condition is met: EFL / AAG≧6.900, wherein a preferred range is 41.500≧EFL / AAG≧6.900.

[0204] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (TL-Gavg) / ImgH≧5.000, wherein a preferred range is 24.000≧(TL-Gavg) / ImgH≧5.000.

[0205] In the optical lens assembly 10 of the embodiment of the present invention, the following condition is met: HFOV*Gmin≦1.260 degrees·mm, wherein a preferred range is 0.270 degrees·mm≦HFOV*Gmin≦1.260 degrees·mm.

[0206] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (Tavg+BFL) / Gmax≧4.500, wherein a preferred range is 29.300≧(Tavg+BFL) / Gmax≧4.500.

[0207] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (G12+T3) / AAG≧2.750, wherein a preferred range is 45.000≧(G12+T3) / AAG≧2.750.

[0208] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: Fno / Gmax≧8.300 mm -1 , among which the preferred range is 54.000 mm -1 ≧Fno / Gmax≧8.300 mm -1 .

[0209] In the optical lens assembly 10 of the embodiment of the present invention, the following condition is met: HFOV / (T1+BFL)≦9.500 degrees / mm, wherein a preferred range is 2.200 degrees / mm≦HFOV / (T1+BFL)≦9.500 degrees / mm.

[0210] In the optical lens assembly 10 of the embodiment of the present invention, the following condition is met: HFOV*(ALT+EFL)≧49.000 degrees·mm, wherein a preferred range is 70.100 degrees·mm≧HFOV*(ALT+EFL)≧49.000 degrees·mm.

[0211] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: Tmax / Gavg≧4.900, wherein a preferred range is 89.300≧Tmax / Gavg≧4.900.

[0212] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (T2+T3) / Gmin≧12.500, wherein a preferred range is 127.500≧(T2+T3) / Gmin≧12.500.

[0213] In the optical lens assembly 10 of the embodiment of the present invention, the following conditional expression is satisfied: (Tmin+T3) / Gmax≧5.500, wherein a preferred range is 70.200≧(Tmin+T3) / Gmax≧5.500.

[0214] Furthermore, any combination of parameters in the embodiments can be selected to increase lens restrictions, thereby facilitating the design of lenses with the same structure as the present invention. Given the unpredictability of optical system design, within the structure of the embodiments of the present invention, compliance with the above-mentioned conditional formula can preferably reduce the size of the optical lens assembly 10 of the embodiments of the present invention, maintain good optical quality, or improve assembly yield, thereby overcoming the shortcomings of prior art.

[0215] The exemplary limiting relationships listed above may be selectively combined in varying quantities and applied to the embodiments of the present invention, and are not intended to be limiting. In implementing the present invention, in addition to the aforementioned relationships, additional lens details, such as the arrangement of concave and convex surfaces, may be designed for a single lens or more broadly for multiple lenses to enhance control over system performance and / or resolution. It should be noted that these details may be selectively combined and applied to other embodiments of the present invention, provided that no conflicts exist.

[0216] In summary, the optical lens assembly 10 of the embodiment of the present invention can achieve the following effects and advantages:

[0217] 1. When n2 / (n1-n3)≧14.000 is satisfied in the present invention, manufacturing costs can be reduced. Furthermore, by using the first lens element 1 with a negative refractive power to balance the overall focal length, the aberration of the optical lens assembly 10 can be effectively improved, distortion can be reduced, and the system length of the optical lens assembly 10 can be shortened.

[0218] 2. When n3 / |n2-n1|≦170.000 is satisfied in the present invention, the third lens element 3 is made of a low-refractive-index material to reduce manufacturing costs. Furthermore, the negative refractive power of the first lens element 1 and the convex surface of the circumferential region 112 of the light-emitting surface 11 of the first lens element 1 balance the overall focal length and correct for aberrations in the central field of view and distortion in the peripheral field of view of the imaging plane.

[0219] 3. The lens of the present invention is made of plastic material, which helps to reduce the weight of the lens and reduce production costs.

[0220] The numerical ranges obtained by combining and proportioning the optical parameters disclosed in various embodiments of the present invention and including the maximum and minimum values ​​can all be implemented accordingly.

[0221] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary skill in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent applications.

Claims

1. An optical lens assembly comprising, in order from a light-emitting side to a light-entering side along an optical axis, a first lens, a second lens, and a third lens, wherein each of the first lens to the third lens comprises a light-emitting surface facing the light-emitting side and a light-entering surface facing the light-entering side, wherein The first lens has a negative refractive power; The optical lens set only includes the first to third lenses, and the optical lens set is used for projection and further satisfies the following conditional formula: n2 / (n1-n3)≧14.000, where n1 is the nd refractive index of the first lens, n2 is the nd refractive index of the second lens, and n3 is the nd refractive index of the third lens.

2. An optical lens assembly comprising, in order from a light-exiting side to a light-entering side along an optical axis, a first lens, a second lens, and a third lens, wherein each of the first lens to the third lens comprises a light-exiting surface facing the light-exiting side and a light-entering surface facing the light-entering side, wherein The first lens has a negative refractive power, and a circumferential area of ​​the light-emitting surface of the first lens is a convex surface; The optical lens set only includes the first to third lenses, and the optical lens set is used for projection and further satisfies the following conditional formula: n3 / |n2-n1|≦170.000, where n1 is the nd refractive index of the first lens, n2 is the nd refractive index of the second lens, and n3 is the nd refractive index of the third lens.

3. The optical lens assembly as claimed in claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: V3 / V1≧2.200, wherein V1 is the Vd Abbe number of the first lens element, and V3 is the Vd Abbe number of the third lens element.

4. The optical lens assembly as claimed in claim 1 or 2, wherein the optical lens assembly further satisfies the following conditional equation: (V3+V2) / V1≧3.300, wherein V1 is the Vd Abbe number of the first lens element, V2 is the Vd Abbe number of the second lens element, and V3 is the Vd Abbe number of the third lens element.

5. The optical lens assembly as claimed in claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: T1 / G12≧5.000, wherein T1 is the thickness of the first lens on the optical axis, and G12 is the air gap between the first lens and the second lens on the optical axis.

6. The optical lens assembly of claim 1 or 2, further satisfying the following conditional equation: (T1+T2) / G23≧4.000, wherein T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

7. The optical lens assembly of claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: (T3 + EFL) / Fno ≧ 1.550 mm, where T3 is the thickness of the third lens element along the optical axis, EFL is the effective focal length of the optical lens assembly, and Fno is the aperture value of the optical lens assembly.

8. The optical lens assembly of claim 1 or 2, further satisfying the following condition: ALT / Gmax≧8.000, wherein ALT is the sum of the thicknesses of the first through third lenses on the optical axis, and Gmax is the maximum air gap between the first through third lenses on the optical axis.

9. The optical lens assembly according to claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: TTL / Gmin≧26.000, wherein TTL is the distance between the light-emitting surface of the first lens and a light-emitting surface on the optical axis, and Gmin is the minimum air gap between all lenses from the first lens to the third lens on the optical axis.

10. The optical lens assembly according to claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: EFL / AAG≧6.900, wherein EFL is the effective focal length of the optical lens assembly, and AAG is the sum of two air gaps between the first lens and the third lens on the optical axis.

11. The optical lens assembly according to claim 1 or 2, wherein the optical lens assembly further satisfies the following conditional equation: (TL - Gavg) / ImgH ≥ 5.000, wherein TL is the distance on the optical axis from the light-exiting surface of the first lens element to the light-incident surface of the third lens element, Gavg is the average value of the air gap on the optical axis from the first lens element to the third lens element, and ImgH is the image height of the optical lens assembly.

12. The optical lens assembly according to claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: HFOV*Gmin≦1.260 degrees·mm, wherein HFOV is a half viewing angle of the optical lens assembly, and Gmin is a minimum value of the air gap between the first lens and the third lens on the optical axis.

13. The optical lens assembly of claim 1 or 2, further satisfying the following conditional equation: (Tavg + BFL) / Gmax ≥ 4.500, wherein Tavg is the average lens thickness of all lenses on the optical axis, BFL is the distance from the light incident surface to a light emitting surface of the third lens on the optical axis, and Gmax is the maximum air gap between all lenses from the first lens to the third lens on the optical axis.

14. The optical lens assembly of claim 1 or 2, further satisfying the following conditional equation: (G12 + T3) / AAG ≥ 2.750, wherein G12 is the air gap between the first lens and the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and AAG is the sum of the air gaps between the first lens and the third lens on the optical axis.

15. The optical lens assembly as claimed in claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: Fno / Gmax≧8.300 mm -1 , where Fno is the aperture value of the optical lens group, and Gmax is the maximum value of the air gap of all lenses from the first lens to the third lens on the optical axis.

16. The optical lens assembly of claim 1 or 2, further satisfying the following condition: HFOV / (T1+BFL)≦9.500 degrees / mm, wherein HFOV is a half-angle of view of the optical lens assembly, T1 is a thickness of the first lens on the optical axis, and BFL is a distance from a light-entering surface to a light-emitting surface of the third lens on the optical axis.

17. The optical lens assembly according to claim 1 or 2, wherein the optical lens assembly further satisfies the following condition: HFOV*(ALT+EFL)≧49.000 degrees·mm, wherein HFOV is the half viewing angle of the optical lens assembly, ALT is the sum of the thicknesses of the first lens to the third lens on the optical axis, and EFL is the effective focal length of the optical lens assembly.

18. The optical lens assembly of claim 1 or 2, further satisfying the following condition: Tmax / Gavg≧4.900, wherein Tmax is the maximum thickness of the three lenses from the first lens to the third lens on the optical axis, and Gavg is the average value of the air gap between the first lens and the third lens on the optical axis.

19. The optical lens assembly of claim 1 or 2, further satisfying the following condition: (T2+T3) / Gmin≧12.500, wherein T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and Gmin is the minimum air gap between the first lens and the third lens on the optical axis.

20. The optical lens assembly of claim 1 or 2, further satisfying the following conditional equation: (Tmin+T3) / Gmax≧5.500, wherein Tmin is the minimum thickness of the three lenses from the first lens to the third lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and Gmax is the maximum air gap between all lenses from the first lens to the third lens on the optical axis.

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