CN102854611A - Micro imaging lens - Google Patents

Abstract

The invention relates to a microminiature imaging lens, which comprises a first lens, a second lens, a third lens, an aperture, a fourth lens and a fifth lens which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens is a crescent lens with negative refractive power, the convex surface of the crescent lens faces to the object side, and at least one surface of the crescent lens is an aspheric surface; the second lens is a biconvex lens with positive refractive power; the third lens is a biconcave lens with negative refractive power; the fourth lens is a biconvex lens with positive refractive power, and at least one surface of the fourth lens is an aspheric surface; the fifth lens is a lens with negative refractive power, so that the lens configuration can achieve the purposes of miniaturization and high optical efficiency.

Description

Micro Imaging Lenses

technical field

The present invention relates to an optical device, and more specifically refers to a miniature imaging lens.

Background technique

In recent years, with the advancement of technology, image capture devices such as cameras, video cameras, microscopes or scanners have gradually become smaller and lighter in order to facilitate people's portability and use. This will make the imaging devices used in image capture devices The size of the lens is also greatly reduced. In addition, in addition to miniaturization and light weight, higher optical performance is also required to achieve high-resolution and high-contrast display. Therefore, miniaturization and high optical performance are two indispensable requirements for imaging lenses.

However, in order to achieve high optical performance, the current imaging lens used by the image capture device is nothing more than using a plurality of lens groups, and some lenses even have more than ten lenses in total. In addition, in order to achieve the purpose of miniaturizing the imaging lens, only a few lenses are used, but the optical performance cannot be effectively improved.

Based on the above, the known imaging lens is still not perfect, and still needs to be improved.

Contents of the invention

The technical problem to be solved by the present invention is to provide a miniaturized imaging lens which is not only small in size but also has high optical efficiency in view of the defect that the imaging lens in the prior art cannot satisfy miniaturization and high optical performance at the same time.

The technical solution adopted by the present invention to solve its technical problems is to provide a micro-miniature imaging lens, which includes a first lens, a second lens, a third lens, Aperture, fourth lens and fifth lens. Wherein, the first lens is a crescent lens with negative refractive power, its convex surface faces the object side, and at least one side is an aspheric surface; the second lens is a biconvex lens with positive refractive power; the third lens has The biconcave lens with negative refractive power; the fourth lens is a biconvex lens with positive refractive power, and at least one side is an aspheric surface; the fifth lens is a lens with negative refractive power.

In this way, the purpose of miniaturization and high optical performance can be achieved by using the arrangement of the lens and the aperture.

Description of drawings

Fig. 1 is a lens configuration diagram of the first preferred embodiment of the present invention.

Fig. 2 is an optical path diagram of the first preferred embodiment of the present invention.

FIG. 3A is a field curvature diagram and a distortion diagram of the first preferred embodiment of the present invention.

FIG. 3B is a lateral light fan diagram of the first preferred embodiment of the present invention.

FIG. 3C is a diagram of the through-focus modulation transfer function of the first preferred embodiment of the present invention.

FIG. 3D is a diagram of the spatial frequency modulation transfer function of the first preferred embodiment of the present invention.

Fig. 4 is a lens configuration diagram of the second preferred embodiment of the present invention.

Fig. 5 is an optical path diagram of the second preferred embodiment of the present invention.

FIG. 6A is a field curvature diagram and a distortion diagram of the second preferred embodiment of the present invention.

FIG. 6B is a lateral light fan diagram of the second preferred embodiment of the present invention.

FIG. 6C is a diagram of the through-focus modulation transfer function of the second preferred embodiment of the present invention.

FIG. 6D is a diagram of the spatial frequency modulation transfer function of the second preferred embodiment of the present invention.

Fig. 7 is a lens configuration diagram of the third preferred embodiment of the present invention.

Fig. 8 is an optical path diagram of the third preferred embodiment of the present invention.

FIG. 9A is a field curvature diagram and a distortion diagram of the third preferred embodiment of the present invention.

FIG. 9B is a lateral light fan diagram of the third preferred embodiment of the present invention.

FIG. 9C is a diagram of the through-focus modulation transfer function of the third preferred embodiment of the present invention.

FIG. 9D is a diagram of the spatial frequency modulation transfer function of the third preferred embodiment of the present invention.

Detailed ways

In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with accompanying drawings as follows.

Please refer to FIG. 1 , which is a lens arrangement diagram of a miniature imaging lens 1 according to a first preferred embodiment of the present invention. FIG. 2 is an optical path diagram of the embodiment shown in FIG. 1 . With reference to FIG. 1 and FIG. 2 , the micro-miniature imaging lens 1 according to the first embodiment of the present invention will be described in detail below.

The miniature imaging lens 1 includes a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4 and a fifth lens L5 arranged in sequence along the optical axis Z from the object side to the image side. . In addition, according to the needs of use, a filter CF, which is flat glass, can be optionally provided between the fifth lens L5 and the imaging plane IP (Image Plane). in:

The first lens L1 is made of glass material, and is a crescent-shaped lens with negative refractive power, with its convex surface facing the object side. In addition, both the convex surface S1 and the concave surface S2 of the first lens L1 are aspheric surfaces.

The second lens L2 is made of glass material and is a biconvex lens with positive refractive power. The third lens L3 is made of glass material and is a biconcave lens with negative refractive power. In addition, the second lens L2 is glued to the third lens L3 to form a cemented lens L23 with positive refractive power.

The fourth lens L4 is made of glass material and is a biconvex lens with positive refractive power. In addition, the two convex surfaces S8 and S9 of the fourth lens L4 are both aspheric surfaces.

The fifth lens L5 is made of glass material, and is a crescent-shaped lens with negative refractive power, and its convex surface S11 faces the image side.

In the above-mentioned lens configuration of the miniature imaging lens 1, the negative refractive power characteristic of the first lens L1, the positive refractive power characteristic of the fourth lens L4, and the aspheric surface design of the two lenses L1 and L4 can make the miniature imaging lens The lens 1 has a better imaging effect, and can effectively shorten the total length of the lens, and also enables the miniature imaging lens 1 to obtain a larger field of view (Field of View Angle, FOV).

The focal length F (Focus Length), the numerical aperture Fno (F-number) of the miniature imaging lens 1 of the first embodiment of the present invention, the radius of curvature R (radius of curvature) where the optical axis Z of each lens surface passes through, each lens at The thickness T (thickness) on the optical axis Z, the refractive index Nd (refractive index) of each lens and the Abbe number Vd (Abbe number) of each lens are shown in Table 1:

Table I

In each lens of the present embodiment, the surface concavity z of these aspherical surfaces S1, S2, S8 and S9 is obtained by the following formula:

$\mathrm{<span\; class="notranslate">\; z</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="ch"\; filenames="HDA0000142088970000081.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">ch</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; c</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ]</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="4"\; label="Ah"\; filenames="HDA0000142088970000011.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">Ah</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="6"\; label="Bh"\; filenames="HDA0000142088970000111.png"\; state="\{\{state\}\}">Bh</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="8"\; label="Ch"\; filenames="HDA0000142088970000011.png"\; state="\{\{state\}\}">Ch</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="10"\; label="Dh"\; filenames="HDA0000142088970000011.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">Dh</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Eh</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; fh</span>}}^{\mathrm{<span\; class="notranslate">\; 14</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Gh</span>}}^{\mathrm{<span\; class="notranslate">\; 16</span>}}$

in:

z: Concavity of the aspheric surface;

c: the reciprocal of the radius of curvature;

h: the aperture radius of the surface;

k: conic coefficient;

A～G: coefficients of each order of surface aperture radius h.

In this embodiment, the conic coefficient k (conic constant) of each aspherical surface and the coefficients A to G of each order of the surface aperture radius h are shown in Table 2:

Table II

With the configuration of the above-mentioned lens and aperture ST, the miniature imaging lens 1 of this embodiment can not only effectively reduce the size to meet the miniaturization requirements, but also meet the requirements in terms of imaging quality, which can be seen from FIGS. 3A to 3D out.

Shown in Fig. 3 A is the field curvature diagram and distortion diagram of the miniature imaging lens 1 of the present embodiment; Shown in Fig. 3B is the lateral light fan diagram of the miniature imaging lens 1 of the present embodiment; Shown in Fig. 3C It is the through focus modulation transfer function diagram (Through Focus MTF) of the miniature imaging lens 1 of the present embodiment; shown in Fig. 3D is the spatial frequency modulation transfer function diagram (Spatial MTF) of the miniature imaging lens 1 of the present embodiment Frequency MTF).

It can be seen from FIG. 3A that the maximum field curvature of this embodiment does not exceed 0.1mm and -0.1mm, and the distortion does not exceed 0.6%. It can be seen from FIG. 3B and FIG. 3C that this embodiment has good resolution regardless of the position of the field of view. It can be seen from FIG. 3D that the modulation optical transfer function value of this embodiment is still above 60% at 48 lp/mm. It is obvious that the resolution of the miniature imaging lens 1 of this embodiment meets the standard.

The above is the miniature imaging lens 1 of the first embodiment of the present invention; according to the technology of the present invention, the second embodiment of the present invention will be described below with reference to FIG. 4 and FIG. 5 .

Similar to the first embodiment, the miniature imaging lens 2 of the second embodiment of the present invention includes a first lens L1, a second lens L2, a third lens L3, The aperture ST, the fourth lens L4 and the fifth lens L5 are also provided with a flat glass filter CF between the fifth lens L5 and the imaging plane IP. in:

The first lens L1 is made of glass material, and is a crescent-shaped lens with negative refractive power, with its convex surface S1 facing the object side. In addition, both the convex surface S1 and the concave surface S2 of the first lens L1 are aspherical surfaces.

The second lens L2 is made of glass material and is a biconvex lens with positive refractive power. The third lens L3 is made of glass material and is a biconcave lens with negative refractive power. In addition, the second lens L2 is glued to the third lens L3 to form a cemented lens L23 with positive refractive power.

The fourth lens L4 is made of glass material and is a biconvex lens with positive refractive power. In addition, the two convex surfaces S8 and S9 of the fourth lens L4 are both aspheric surfaces.

The fifth lens L5 is made of glass material, and is a crescent-shaped lens with negative refractive power, and its convex surface S11 faces the image side.

In the above-mentioned lens configuration, wherein the negative refractive power characteristic of the first lens L1, the positive refractive power characteristic of the fourth lens L4, and the aspherical design of the two lenses L1, L4 can also make the miniature imaging lens 2 have Better imaging effect, effectively shortening the total length of the lens, and enabling the miniature imaging lens 2 to obtain a larger field of view (Field of View Angle, FOV).

The focal length F (Focus Length), the numerical aperture Fno (F-number) of the miniature imaging lens 2 of the second embodiment of the present invention, the radius of curvature R (radius of curvature) where the optical axis Z of each lens surface passes through, each lens at The thickness T (thickness) on the optical axis Z, the refractive index Nd (refractive index) of each lens and the Abbe coefficient Vd (Abbe number) of each lens are shown in Table 3:

Table three

In each lens of the present embodiment, the surface concavity z of these aspherical surfaces S1, S2, S8 and S9 is obtained by the following formula:

$\mathrm{<span\; class="notranslate">\; z</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="ch"\; filenames="HDA0000142088970000081.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">ch</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; c</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ]</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="4"\; label="Ah"\; filenames="HDA0000142088970000011.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">Ah</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="6"\; label="Bh"\; filenames="HDA0000142088970000111.png"\; state="\{\{state\}\}">Bh</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="8"\; label="Ch"\; filenames="HDA0000142088970000011.png"\; state="\{\{state\}\}">Ch</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="10"\; label="Dh"\; filenames="HDA0000142088970000011.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">Dh</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Eh</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; fh</span>}}^{\mathrm{<span\; class="notranslate">\; 14</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Gh</span>}}^{\mathrm{<span\; class="notranslate">\; 16</span>}}$

in:

z: Concavity of the aspheric surface;

c: the reciprocal of the radius of curvature;

h: the aperture radius of the surface;

k: conic coefficient;

A～G: coefficients of each order of surface aperture radius h.

In this embodiment, the conic coefficient k (conic constant) of each aspherical surface and the coefficients A to G of each order of the surface aperture radius h are shown in Table 4:

Table four

With the configuration of the above-mentioned lens and aperture ST, the micro-miniature imaging lens 2 of this embodiment can not only effectively reduce the volume to meet the miniaturization requirements, but also meet the requirements in terms of imaging quality, which can be seen from FIGS. 6A to 6D out.

Shown in Fig. 6A is the field curvature diagram and distortion diagram of the miniature imaging lens 2 of the present embodiment; shown in Fig. 6B is the lateral light fan diagram of the miniature imaging lens 2 of the present embodiment; shown in Fig. 6C It is the through-focus modulation transfer function diagram (Through Focus MTF) of the miniature imaging lens 2 of the present embodiment; shown in FIG. Frequency MTF).

It can be seen from FIG. 6A that the maximum field curvature of this embodiment does not exceed 0.1mm and -0.1mm, and the distortion does not exceed 0.6%. It can be seen from Fig. 6 B and Fig. 6 C that the present embodiment has good resolution regardless of the position of the field of view. It can be seen from FIG. 6D that the modulation optical transfer function value of this embodiment is still above 50% at 48 lp/mm. It is obvious that the resolution of the miniature imaging lens 2 of this embodiment meets the standard.

Please refer to FIG. 7 and FIG. 8 , which are the lens configuration and optical path diagram of the miniature imaging lens 3 according to the third preferred embodiment of the present invention. The miniature imaging lens 3 also includes a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4 and a fifth lens L5 arranged along the optical axis Z from the object side to the image side, Moreover, a filter CF of plate glass is also arranged between the fifth lens L5 and the imaging plane IP. in:

The first lens L1 is made of glass material, and is a crescent-shaped lens with negative refractive power, with its convex surface facing the object side. In addition, both the convex surface S1 and the concave surface S2 of the first lens L1 are aspherical surfaces.

The second lens L2 is made of glass material and is a biconvex lens with positive refractive power. The third lens L3 is made of glass material and is a biconcave lens with negative refractive power. In addition, the second lens L2 is glued to the third lens L3 to form a cemented lens L23 with negative refractive power.

The fourth lens L4 is made of glass material and is a biconvex lens with positive refractive power. In addition, the two convex surfaces S8 and S9 of the fourth lens L4 are both aspheric surfaces.

The fifth lens L5 is made of glass material and is a biconcave lens with negative refractive power.

And in the above-mentioned lens configuration, wherein the negative refractive power characteristic of the first lens L1, the positive refractive power characteristic of the fourth lens L4, and the aspherical design of the two lenses L1, L4 can also make the miniature imaging lens 3 have Better imaging effect, effectively shortening the total length of the lens, and enabling the miniature imaging lens 3 to obtain a larger field of view (Field of ViewAngle, FOV).

The focal length F (Focus Length), the numerical aperture Fno (F-number) of the miniature imaging lens 3 of the third embodiment of the present invention, the radius of curvature R (radius of curvature) where the optical axis Z of each lens surface passes through, each lens at The thickness T (thickness) on the optical axis Z, the refractive index Nd (refractive index) of each lens and the Abbe coefficient Vd (Abbe number) of each lens are shown in Table 5:

Table five

In each lens of the present embodiment, the surface concavity z of these aspherical surfaces S1, S2, S8 and S9 is obtained by the following formula:

$\mathrm{<span\; class="notranslate">\; z</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="ch"\; filenames="HDA0000142088970000081.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">ch</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; c</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ]</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="4"\; label="Ah"\; filenames="HDA0000142088970000011.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">Ah</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="6"\; label="Bh"\; filenames="HDA0000142088970000111.png"\; state="\{\{state\}\}">Bh</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="8"\; label="Ch"\; filenames="HDA0000142088970000011.png"\; state="\{\{state\}\}">Ch</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="10"\; label="Dh"\; filenames="HDA0000142088970000011.png,HDA0000142088970000111.png"\; state="\{\{state\}\}">Dh</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Eh</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; fh</span>}}^{\mathrm{<span\; class="notranslate">\; 14</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Gh</span>}}^{\mathrm{<span\; class="notranslate">\; 16</span>}}$

in:

z: Concavity of the aspheric surface;

c: the reciprocal of the radius of curvature;

h: the aperture radius of the surface;

k: conic coefficient;

A～G: coefficients of each order of surface aperture radius h.

In this embodiment, the conic coefficient k (conic constant) of each aspherical surface and the coefficients A to G of each order of the surface aperture radius h are shown in Table 6:

Table six

With the configuration of the above-mentioned lenses and aperture ST, the miniature imaging lens 3 of this embodiment can not only effectively reduce the volume to meet the miniaturization requirements, but also meet the requirements in terms of imaging quality, which can be seen from FIGS. 9A to 9D out.

Shown in FIG. 9A is the field curvature diagram and distortion diagram of the miniature imaging lens 3 of the present embodiment; shown in FIG. 9B is the transverse light fan diagram of the miniature imaging lens 3 of the present embodiment; shown in FIG. 9C It is the through focus modulation transfer function diagram (Through Focus MTF) of the miniature imaging lens 3 of the present embodiment; shown in FIG. Frequency MTF).

It can be seen from FIG. 9A that the maximum field curvature of this embodiment does not exceed 0.1mm and -0.1mm, and the distortion does not exceed 0.6%. It can be seen from FIG. 9B and FIG. 9C that this embodiment has good resolution regardless of the position of the field of view. It can be seen from FIG. 9D that the modulation optical transfer function value of this embodiment is still above 50% at 48 lp/mm, which shows that the resolution of the miniature imaging lens of this embodiment meets the standard.

Based on the above, it can be seen that the miniature imaging lens of the present invention can not only effectively reduce the size but also have high optical performance.

The above description is only a preferred feasible embodiment of the present invention, and any equivalent structure and manufacturing method changes made by applying the specification and claims of the present invention should be included in the patent scope of the present invention.

Claims (9)

1. A micro-miniature imaging lens is characterized in that it includes along the optical axis and is arranged in sequence from the object side to the image side: The first lens is a crescent-shaped lens with negative refractive power, its convex surface faces the object side, and at least one side is an aspheric surface; The second lens is a biconvex lens with positive refractive power; The third lens is a biconcave lens with negative refractive power; aperture; The fourth lens is a biconvex lens with positive refractive power, and at least one side is an aspheric surface; The fifth lens is a lens with negative refractive power. 2. The miniature imaging lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all made of glass. 3. The miniature imaging lens as claimed in claim 1, wherein both the concave surface and the convex surface of the first lens are aspherical surfaces. 4. The miniature imaging lens as claimed in claim 1, wherein both convex surfaces of the fourth lens are aspheric surfaces. 5. The miniature imaging lens as claimed in claim 1, wherein the second lens and the third lens are glued to form a cemented lens, and the cemented lens has positive refractive power. 6 . The miniature imaging lens as claimed in claim 1 , wherein the second lens and the third lens are glued together to form a cemented lens, and the cemented lens has a negative refractive power. 7. The miniature imaging lens according to claim 1, further comprising a filter, located between the fifth lens and the image side, and is a plate glass. 8 . The miniaturized imaging lens as claimed in claim 1 , wherein the fifth lens is a crescent lens with a convex surface facing the image side. 9. The miniature imaging lens as claimed in claim 1, wherein the fifth lens is a biconcave lens.

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