TW200848778A - Wide lens - Google Patents

Abstract

A wide lens from the object side comprises a first lens element, a second lens element, a third lens element, an aperture stop and a fourth lens element. With the above-mentioned four lens elements, even if the field of view can reach up to 140 degree, such a wide lens can avoid the extreme bent portions in a periphery of the image, and the image has high sharpness which is applicable to monitor and car lens.

Description

200848778 - IX. Description of the Invention: [Technical Field] The present invention is a wide-angle lens having a first lens, a second lens, a third lens, an aperture and a fourth lens arranged in sequence, and particularly refers to a suitable Solid image capture on monitors or cars, with a viewing angle of up to 140. Super wide-angle lens. [Prior Art]

The problem is that the length is too long and the weight is too heavy. Therefore, P ---------

As long as 4 to 5 lenses, as long as 3 to 4 lenses, the lens looks at the lens angle of view 120. When the above is popular, there are many small spherical lenses. When the angle of view of the lens is 100°, as long as 4 to 丨5 200848778, 5 to 6 lenses are required, and the lens is indeed small and lightweight. For example, the disclosed patent case: the ultra wide-angle lens of Japanese Patent Laid-Open No. 2003-307674, the wide-angle lens of Japanese Patent Laid-Open No. 2005-227426, the wide-angle lens of Japanese Patent Laid-Open No. 2006-146016, and the wide-angle lens of Japanese Patent Laid-Open No. 2006-292988 The image pickup device, the optical device of Japanese Patent Laid-Open No. 2007-025499, has indeed reduced the number of lenses used to 4 to 5 pieces, so the size and weight are determined; f However, the problem of image distortion of these wide-angle lenses is still Existence, the general lens, usually based on the projection method of y, f · tana to correct the distortion of the image, ^ is the image height of the pixel, f is the focal length, ω is the half angle of view, and other projection methods also have stereoscopic projection: y, 2f · tan ( ω/2), equidistant projection method: y' = f · ω, and other solid angle projection methods: y, 2f * sin (6J /2) and orthophotograph: y, 2f.sin6J, but These formulas can be derived at a fixed focal length f. As the angle of view and the half angle of view ω increase, the I image height of the pixel increases. When the value of y' is too large, it cannot be in the plane. To form a complete image, the image of the surrounding area must be compressed to display the image completely inside the surface, but this makes the image around the image difficult to distinguish. If it is used on a monitor, it may not be visible because the surrounding image is blurred. Clear prisoner's face, if used in the car's reversing surveillance system, may cause the driver to ignore the object and ignore the child because of the blurring of the surrounding image; although the current image processing technology is quite advanced, the distortion of the lens exists 6 200848778 Image processing technology is not straightforward, but after processing the image is difficult / ^ enough to directly avoid the surrounding image pressure __ defects, the development of wide-angle I brothers is still _ film sweep /, angle ~ the main inventor himself In the field of the lens, the study of the nine years of the year, the test, the difference between the two, can avoid extreme image distortion, and into a wide-angle lens with sharp sharpness. SUMMARY OF THE INVENTION The present invention provides a wide-angle lens comprising four lenses and an aperture, and sequentially arranged from the object side to the image side as a first lens, a second lens, a second lens, an aperture, and a fourth lens, and - the lens and the second lens are negative half meniscus lenses convexly facing the side, the third lens and the fourth lens are lenses having convex surfaces on both sides, and the mirrors of the first lens, the second lens and the third lens are The face is aspherical, and the mirrors on both sides of the fourth lens are aspherical 'by the arrangement of the lens', the effect of correcting the difference can be achieved with a minimum number of lenses; and = the wide-angle lens is at the angle of view 140. The incident light is affected by the negative force of the first f-sheet and the second lens, and is incident on the first lens ' at a gentle angle, but the light emitted by the second lens has a negative distortion. The non-point payout magnification color difference is corrected by the positive refractive power of the third lens and the fourth lens, so that it is known that the viewing angle is 14G. Under the super wide-angle condition, the wide-angle lens of the present invention can also avoid the image distortion of the imaging week 200848778 with a minimum number of four lenses, and the imaging can have high sharpness. In addition, when the combined focal length of the first to third lenses is ―, and the overall focal length of the wide-angle lens is f, the following relationship is satisfied: -15· 0 < f 123/f < —8· 0 because When Wf>-8. ,, the negative refractive power of the first lens and the second lens will be too large to make the image around the imaging image too large, and it must be corrected by using image processing technology; when fl23/f<_15 G At the time of the guide, 14〇. The light of the first lens must be relatively increased, which will increase the difficulty of miniaturizing the lens. Although the focal length of the fourth lens is (4), the following relationship is satisfied: -6· 5<f123/f4<-3. 〇Because when fl23/f4>-3.〇, the positive refractive power of the fourth lens will decrease. Winter's heat method completely corrects the negative quilting difference, and must be corrected by image processing; =3/4<~6.5' The positive refractive power of the fourth lens will become too high, and it must be increased. Imaging. Mirror surface 4 =: 7 objects: the mirror curvature half..., the image side is r6 day guard, to satisfy the following relationship: (r6+r5) / (r6-r5) <1.〇200848778 because (r6+r5 ) / (r6-r5) >1.0 The Japanese will become smaller, although it is helpful in correcting the distortion of the distortion, the correction effect of the curvature radius aberration of ^ is reduced by the point ^ and the comet is low; , "一◦:20%^正歪曲收差. ... will achieve the need to make up the fourth lens to the object side of the mirror surface radius of curvature ^, the image side of the face radius of curvature is "quote, to meet The following relation: , -〇.55< (r9+r8) / (r9-r8) <-0.45 positive /i(r9+r8)/(r9-r8)> rhyme, spherical compensation... When ("_(,9,)"..55, the correction of the spherical aberration will be excessive, and the sharpness of the image of the image will be very low. [Embodiment] The implementation of the wide-angle lens of the present invention is, for example, From the third to the seventh, the angle of view (10) can be applied to a monitor or a car: and the inch: 1A to $7A is a schematic diagram of various embodiments of the wide-angle lens, and the wide-angle lens is placed from the object side to the object side. The side of the image is arranged in order - The sheet i, the second lens 2, the third lens 3, the aperture 5, the fourth lens 4, the cymbal 6, the glass cover 7, and the imaging surface 8, wherein: the first slice 1 is a negative half of the convex surface facing the object side The meniscus lens, the second lens 2 is a negative half-bend dry bow material with a convex surface facing the object side, and the third lens 3 is a convex lens. The fourth lens is convex on both sides. The lens, and the four lenses 2, 3, and 4 are all materials to save material cost, and in the mirror surface of the second lens 2 and the third lens 3, at least four mirror surfaces are aspherical mirrors. The mirrors of the fourth lens 4 are aspherical mirrors, and the filter 6 and the cover 7 are both formed by a plane _ which is used to block infrared rays. The glass cover 7 is disposed on the imaging surface. 8 to protect members such as CCD or CMOS; and in the embodiment, respectively, L1 (incident angle r), L2 (incident angle 21°), L3 (incident angle 35d), L4 (incident angle 42), [5 ( Incident angles L), L6 (incident angle 56.) 47 (incident angle 63 〇), L8 (incident angle 7 〇.), etc., and the angle of the person shooting the wide-angle lens Like on the imaging surface 8, as can be seen from the drawing, the peripheral image of the image is not extremely compressed, and the moon b is enough to form a holographic and correct image, and the image is more sharp and sharp; Figures 7B are graphs corresponding to the 1A to 7A graphs, wherein (a) is a spherical aberration graph, wherein the ◦ line, the d line, the e line, the F line, and the g line respectively represent different The spherical surface of the wavelength light is divided by the leg, and (b) is a graph of the non-point difference, indicating the non-point difference of the light of different wavelengths, the unit is mm ' and S represents the horizontal difference, and τ represents the vertical The difference is (c) is the curve of the distortion of the distortion, indicating the distortion of the different wavelengths of light, the unit is %' and it can be seen from the figure that the wide-angle lens has corrected various losses to enough for 10200848778, practical degree . In the lower jaw J males, in the example, the wide-angle head value is FN0. The apparent focal length is {, the aperture angle is 2ω, and the respective mirrors are numbered sequentially from the object side, and the two lenses of the wide-angle lens are... For the mirror of the second brother's month 2 is the illusion of the well 圃 "... The mirror of the mourning brother - the syllabary 3 is S5, S6, the mirror of the syllabary 5 is S7, the mirror of the cymbal 6 Mm cm X is 4 S8, S9, the =L S11' the mirror surface of the glass cover 7 is a crime. For example, the formula for the aspherical surface is ·· x=(i/R)HV{i+[i_(1+K) (H/R 2]-}+Ar+BH6+CH8+DHl0 弁/, B, C, D are aspheric coefficients, H is the height at which the optical axis starts, X is the displacement in the first axis direction, and x is the basis of the surface vertices r is the paraxial radius of curvature, K is the conical record, and ship tE represents the scientific notation, as e_q3 represents ι〇3. In the embodiment of Figure 1A, u〇.868mm, FN〇. is 28,2 〇 140, and the radius of curvature "unit surface", the interplanar spacing d (unit_), the inflection rate nd, and the inverse dispersion ratio vd of each mirror surface are as follows: 11 200848778 rd nd vd S1 37.482 1. 658 1. 53 56. 3 S2 5. 1 2.481 S3 13· 033 0. 703 1. 53 56. 3 S4 1. 3516 1. 098 S5 3. 094 3. 316 1. 63 23.4 S6 -50· 05 1. 076 S7 〇〇0. 768 S8 3. 6223 2. 668 1. 53 56. 3 S9 -1·084 0. 549 S10 〇〇0· 3 BSC7 S11 〇〇0. 22 S12 〇〇0.4 BSC7 S13 〇〇表ΙΑ Table 1Β shows the aspherical coefficients of the mirrors, and the mirror surface S2 of the first lens 1 except that the mirror surface S1 of the first lens 1 is a spherical mirror surface The mirrors S3, S4, S5, S6, S8, and S9 of the remaining lenses 2, 3, and 4 are all aspherical mirrors, and the values of K, A, B, C, and D are as shown in Table 1B below: S2 S3 S4 S5 K -0.30617 K -130.592 K -2.22925 K 0.014399 A -1.4258E-04 A 2.06049E-05 A 0·019928 A 2.69735E-03 B -1.7796E-05 B 3.69527E-05 B -5.8237E-04 B -1.5359 E-04 C -3.9258E-07 C -2.1735E-06 C 6.74317E-05 C 1.34546E-05 D -2.2476E-08 D 2.55094E-08 D 7.26238E-07 D 0. 0000 S6 S8 S9 Table IB K 0.0000 K -10.2785 K -2.16306 A 0. 010417 A -2.5238E-03 A -0.014978 B -7.4480E-05 B 2.85871E-03 B 2.66345E-03 C -1.2656E-04 C -6.7331E-04 C 1. 1 0642E-04 D 0.0000 D 3.18772E-05 D -6.4109E-05 12 200848778 ' And in this case The four lenses 1, 2, 3, and 4 are made of plastic, and the distal sheet 6 and the glass cover 7 are made of colorless optical glass (10) (7). In the embodiment of Fig. 2A, f is 0.881 mm, F N0· is 2.8, 2 ω is 140°, and the radius of curvature r (unit leg) of each mirror surface, the surface spacing d (single

The following table 2B is the aspherical coefficient of each mirror surface. In this embodiment, except that the mirror surface S1 of the first lens 1 is a spherical mirror surface, the mirror surface S2 and the mirror surfaces S3, S4, S5, S6, and S8 of the remaining lenses 2, 3, and 4 Both S9 and S9 are aspherical mirrors, and in this embodiment, the four lenses 1, 2, 3, and 4 are made of plastic, and the filter 6 and the cover glass 7 are made of colorless optical glass (BSC7): 13 200848778 S2 S3 S4 S5 K -0.29195 K -307.964 K -2.26337 K 0.131281 A -3.6889E-04 A -2.8127E-05 A 0.023806 A 1.66395E-03 B -3.3492E-05 B 5.64126E-05 B -1. 0143E -03 B -2.2361E-04 C -9.0847E-07 C -4.1176E-06 C 1.67306E-04 C 2.78828E-05 D -5.1873E-08 D 5.76249E-08 D 1.12956E-05 D 0. 0000 S6 S8 S9 Table 2B K 0.00000 K -8.24701 K -2.28854 A 7.14915E-03 A -7.1405E-03 A -2·06280E-02 B 7.43519E-05 B 4.32695E-03 B 4.03999E-03 C -2.4614E -04 C -1.1861E-03 C 1.91367E-04 D 0.0000 D 4.46248E-05 D -1. 6005E-04 In the embodiment of Fig. 3A, f is 0. 885mm, F NO. is 2. 8. 2 ω is 140°, the radius of curvature r (in mm) of each mirror surface, the surface spacing d (unit leg), and The folding rate nd and the inverse dispersion rate vd are as shown in Table 3A below:

Rd nd vd SI 38.075 1. 658 BSC7 S2 4. 1006 2.481 S3 2· 6583 0. 703 1.53 56· 3 S4 0.9793 1. 098 S5 3· 0961 3. 316 1. 63 23.4 S6 -139. 7 1· 076 S7 OO 0. 768 S8 3· 3993 2. 668 1. 53 56· 3 S9 -1. 104 0. 549 S10 OO 0· 3 BSC7 Sll CO 0. 22 S12 CO 0.4 BSC7 S13 CO

Table 3A 14 200848778 Table 3B below shows the aspherical coefficients of the mirrors. In this embodiment, the mirrors S3, S4, S5, S6, S8, and S9 of the three lenses 2, 3, and 4 are all aspherical mirrors: S3 S4 S5 K -8.3267 K -1. 8369 K -0.0685 A -4, 5736E-04 A 0. 018663 A 4.67170E-03 B 1.5069E-04 B -2. 0060E-03 B -7.8960E-04 C -6.8544E -06 C 7. 20489E-06 C 7.92671E-06 D 2.8798E-07 D 2.5550E-06 D 0.0000 S6 S8 S9 K 0.0000 K -17. 4520 K -2. 1555 A 6.48199E-03 A 1.0251E-02 A -1.6781E-02 B 3.0247E-03 B -9.9380E-04 B 2.7050E-03 C -1.1447E-04 C -1.0893E-04 C 4.99743E-04 D 0.0000 D -1.1820E-05 D -1.2380 E-04

In the embodiment, the three lenses 2, 3, and 4 are made of plastic, and the first lens 1, the filter 6 and the cover glass 7 are made of colorless optical glass (BSC7). In the embodiment of Fig. 4A, f is 0·996 mm, F N0. is 2. 8, 2 ω is 140 °, radius of curvature r (unit: mm) of each mirror surface, surface spacing d (unit leg), inflection rate The nd and inverse dispersion rate vd are shown in the following Table 4A: 15 200848778 r D nd vd S1 33· 156 1. 042 L 53 56. 3 S2 4·6052 2. 11 S3 192. 48 0. 599 1. 53 56. 3 S4 1. 502 1. 075 S5 3·0814 3 1. 63 23. 4 S6 -15· 93 0. 977 S7 〇〇0. 94 S8 3·5563 2. 571 1. 53 56. 3 S9 -1·256 0· 5 S10 〇〇0· 3 BSC7 S11 〇〇0· 2 S12 〇〇0.4 BSC7 S13 〇〇

Table 4A below is the aspherical coefficient of each mirror. In this embodiment, except that the mirror surface S1 of the first lens 1 is a spherical mirror surface, the mirror surface S2 and the mirrors S3, S4, S5, and S6 of the remaining lenses 2, 3, and 4 are shown. , S8, S9 are all aspherical mirrors: S2 S3 S4 S5 K -0. 31 7337 K -4061.767 K -2.627553 K -0.00068 A -3.7530E-04 A -2.7790E-05 A 2.5414E-02 A 7.8160E- 04 B -3.2530E-05 B 5.7230E-05 B -1. 1710E-03 B -1.0110E-04 C -1.0739E-06 C -4.1046E-06 C 1.26077E-04 C 1.63242E-05 D -5.7570 E-08 D 5.9822E-08 D 8.1789E-06 D 0.0000 S6 S8 S9 Table 4B K 0.0000 K -7.540089 K -2.573615 A 5. 0869E-03 A -6.5570E-03 A -1.9237E-02 B 4. 5473E -04 B 4.8564E-03 B 4.3423E-03 C -1.3770E-04 C -1.0794E-03 C 2.26471E-04 D 0.0000 D -1.3160E-04 D -1.5790E-04 16 200848778 _ and this age It, t rule that the cymbal 6 and the glaze 7 are made of colorless optical glass (10) 7).

The lower surface i5 is the aspherical coefficient of each mirror surface. In this embodiment, except that the mirror surface S1 of the first lens 1 is a spherical mirror surface, the mirror surface S2 and the mirror surfaces S3, S4, S5, and S6 of the remaining lenses 2, 3, and 4 are formed. The anti-spherical mirrors are all aspherical mirrors, and in the embodiment, the four lenses 1, 2, 3, and 4 are made of plastic, and the filter 6 and the glass cover 7 are made of colorless optical glass (BSC7). : 17 200848778 S2 S3 S4 S5 K -0.31836 K -10571.8 K -2.70782 K -0. 0414 A 3.8168E-04 A -3. 4963E-05 A 0.024128 A 3. 20657E-04 B -3.2659E-05 B 5. 70299E-05 B -1. 1 978E-03 B -6.3624E-05 C -1.0854E-06 C -4. 1130E-06 C 1.33296E-04 C 1.74657E-05 D -5.8072E-08 D 5. 94099E -08 D 7.97304E-06 D 0.0000 S6 S8 S9 Table 5B K 0.0000 K -7.50242 K -2.56657 A 3. 03904E-03 A -7.1587E-03 A -1.9412E-02 B 2.46722E-04 B 4.68392E-03 B 4.10651E-03 C -1.1208E-04 C -1.1126E-03 C 2.15727E-04 D .0.0000 D -1.3618E-04 D -1.5421E-04 In the embodiment of Fig. 6A, f is 1. 003mm, F NO. is 2· 8, 2 ω is 140°, radius of curvature r (unit: mm), face spacing d (unit leg) of each mirror surface The inflection rate nd and the inverse dispersion rate vd are as shown in Table 6A below:

r D nd vd SI 30. 758 0. 924 1. 53 56. 3 S2 4.6101 2· 706 S3 185. 22 0. 601 1· 53 56. 3 S4 1.5407 1. 161 S5 3.5803 3· 002 1· 72 22· 1 S6 -25.46 0. 977 S7 OO 0. 922 S8 3.6996 2. 6 1. 53 56· 3 S9 -1.26 0· 5 S10 OO 0· 3 BSC7 Sll OO 0· 2 S12 OO 0.4 BSC7 S13 OO

Table 6A 18 200848778 Table 6B below shows the aspherical coefficients of the mirrors. In this embodiment, except that the mirror surface S1 of the first lens 1 is a spherical mirror surface, the mirror surface S2 and the mirror surfaces S3, S4, and S5 of the remaining lenses 2, 3, and 4 are shown. , S6, S8, S9 are all aspherical mirrors: S2 S3 S4 So K -0.3197 K -14138. 1 K -2.83595 K -0.02563 A -3.8715E-04 A -2.9065E-05 A 0.023262 A 1.11572E-04 B -3.3001E-05 B 5. 72669E-05 B -1.3038E-03 B -1.8981E-05 C -1.0993E-08 C -4.1075E-06 C 1. 1 9092E-04 C 1.85755E-07 D -5.8638 E-08 D 5.93717E-08 D 6.54210E-06 D 0.0000 S6 S8 S9 Table 6B K 0. 0000 K -7.74769 K -2. 5039 A 2. 19456E-03 A -7.5497E-03 A -1. 9654E- 02 B 1. 87412E-04 B 4. 65994E-03 B 4.01053E-03 C -7.5339E-05 C -1.0953E-03 C 2.07026E-04 D 0.0000 D -1.2958E-04 D -1. 5236E-04 In this embodiment, the four lenses 1, 2, 3, and 4 are made of plastic, and the filter 6 and the cover glass 7 are made of colorless optical glass (BSC7). In the embodiment of Fig. 7A, f is 0·819 mm, F N0. is 2. 8, 2 ω is 140 °, radius of curvature r (unit: mm) of each mirror surface, surface spacing d (unit wakes up), inflection rate The nd and inverse dispersion rate vd are shown in the following list 7A: 19 200848778

Rd nd vd S1 38· 075 1. 658 BSC7 S2 4· 1516 2.481 S3 3· 8988 0. 703 1. 53 56. 3 S4 1·0926 1. 098 S5 3. 0394 3. 316 1. 63 23· 4 S6 -139·7 1. 076 S7 〇〇0. 768 S8 3.4666 2. 668 1. 53 56. 3 S9 -1.051 0. 549 S10 〇〇0· 3 BSC7 S11 〇〇0. 22 S12 〇〇0.4 BSC7 S13 CO

Table 7A shows the aspherical coefficients of the mirrors in Table 7B. In this embodiment, the mirrors S3, S4, S5, S6, S8, and S9 of the three lenses 2, 3, and 4 are all aspherical mirrors: S3 S4 S5 K -26.1724 K -2.30334 K 0.068542 A -4.1612E-04 A 0.025581 A 2.20443E-03 B 1.9828E-04 B -2, 5630E-03 B -1.4690E-04 C -1.0493E-05 C 8.76466E-05 C -1.3458E-05 D 5.6127E-07 D 2.3923E-05 D 0.0000 S6 S8 S9 K 0.0000 K -23.5699 K -2·22357 A 9.60776E-03 A 1.2804E-02 A -3.0414E-02 B -2.8160E -04 B 1. 1178E-03 B 4.7420E-03 C -3.1147E-04 C -6.9335E-04 C 1.25882E-03 D 0.0000 D -5.2700E-05 D -2.6640E-04

Table 7B 20 200848778 and in the embodiment of the present invention, the two lenses 2, 3, and 4 are made of plastic, and the first brother piece 1, the cross piece 6 and the glass cover 7 are made of colorless optical glass (BSC7). It can be seen from the description that the 忒 wide-angle lens is composed of four lens 234, and the incident light will first adjust the incident lightness of the light spring through the first lens 丨 and the second lens 2 to make it more moderate. However, after the light is directed to the third piece 3, the light that passes through the second lens 2 still has a large negative distortion, a non-point difference, and a magnification of the magnification, so the first lens The composite focal length to the third lens is f123, and when the overall focal length of the wide-angle lens is f, the following relationship must be satisfied: 'Relationship 1: -15· 〇< f 123/f < u \ because when f123/f> -8. When 〇, the negative refractive power of the first lens and the second lens will be too large to make the image around the imaging image too large, and it must be corrected by image processing technology; when fl23/f<45.0, it is imported. The perspective is just right. The light ray 'the outer diameter of the first lens must be relatively increased, which will increase the difficulty of miniaturizing the lens.曰When the fourth lens focal length is f4a, the following relationship is satisfied: Relation 2 ·· -6. 5<f123/f4<-3. 〇Because Wf4>-3.〇, the fourth lens The positive refractive power will decrease, so it will not be able to completely correct the negative distortion. You must use image processing correction; 21 200848778, you must decide to prepare f123/f4<-6.5 day temple, the positive refractive power of the fourth lens will become too high ^ The addition-piece lens can be imaged, but the positive refractive power of the 6-Dimensional lens 3 based on the relationship and formula can solve the aforementioned problems. And when the mirror radius of the third lens approaching the object side is r5, and the mirror radius of curvature of the image side is r6, the following relationship is satisfied: Relation 3: 〇·6< (r6+r5)/(r6_r5) <;1〇(R6+r5) / (r6_r5) >1〇, the curvature of the object side will become smaller, although it is helpful in correcting the distortion of the distortion, but in the non-point collection and Hui ^ The correction effect of the aberration difference is reduced, and the sharpness of the imaged image is reduced - (R6+r5) / (r6-r5) < 0.6, the distortion of the distortion that needs to be corrected cannot be achieved. Since the light is incident on the fourth lens 4 after being refracted by the second lens 2 and the third lens 3, it is known that the fourth lens 4 is the main lens for imaging the wide-angle lens, so the following relationship may be The shape of the fourth lens 4 is determined. When the radius of curvature of the mirror on the object side of the fourth lens is r8 and the radius of curvature of the mirror side of the image side is r9, the following relationship is satisfied: · Relationship 4 · -〇. 55 &lt ; ( r9+r8 ) / ( r9-r8 ) < -〇· 45 Because (r9+r8) / (r9-r8) >-〇·45, the correction of the spherical aberration is insufficient, when (r9+ R8) / (r9-r8) <-〇· 55, the spherical aberration 22 200848778 • There will be too many corrections, and the image sharpness of the imaged at the center of the face will become very low; therefore, the same as the relationship 4 The four lenses 4, with the aspherical features of both mirrors, keep the image in the middle and periphery of the image clear and complete. Numerical implementations conforming to the foregoing relationships are as follows: Example 8: Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Remuneration 5 Embodiment 6 Embodiment 7 fWi -9. 42 -10. 7 -8. 25 -13 7 -12. 2 -11.6 -8. 47 fm/ii -4. 14 -4. 77 -3. 66 -6. 28 -5. 53 -5. 31 -3. 60 (r6+r5)/( R6-r5) 0. 88 0. 77 0. 96 0. 68 0. 70 0. 75 0. 96 Cr9+r8)/(r9-r8) -0· 54 -0. 54 -0. 51 -0.48 - 0. 49 -0· 49 -0. 53 Table 8 It can be seen that even if the angle of view of the wide-angle lens is as high as 140°, only four lenses can be used to avoid extreme distortion of the periphery of the image, and the image can have high sharpness, so it is suitable for use. Monitor and car lens. 23 200848778 . BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic view showing the structure of a first embodiment of the present invention. Fig. 1B is a schematic view showing the spherical, non-dot and distortion of the first embodiment of the present invention. 2A is a schematic view showing the structure of a second embodiment of the present invention. Fig. 2B is a schematic view showing the spherical, non-dot and distortion of the second embodiment of the present invention. Fig. 3A is a schematic view showing the structure of a third embodiment of the present invention. Fig. 3B is a schematic view showing the spherical, non-dot and distortion of the third embodiment of the present invention. 4A is a schematic structural view of a fourth embodiment of the present invention. Fig. 4B is a schematic view showing the spherical surface, the non-dot and the distortion of the fourth embodiment of the present invention. Fig. 5A is a schematic view showing the structure of a fifth embodiment of the present invention. Fig. 5B is a schematic view showing the spherical surface, the non-dot and the distortion of the fifth embodiment of the present invention. Fig. 6A is a schematic view showing the structure of a sixth embodiment of the present invention. Fig. 6B is a schematic view showing the spherical, non-dot and distortion of the sixth embodiment of the present invention. Fig. 7A is a schematic view showing the structure of a seventh embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 7 is a schematic view showing a spherical, non-dot and distortion of a seventh embodiment of the present invention. [Main component symbol description] "Invention" First lens 1 Second lens 2 Third lens 3 24 200848778 Fourth lens 4 Aperture 5 Filter 6 Glass cover 7 Imaging surface 8

Claims (1)

200848778 $r - X. Patent application scope · 1. 1. A wide-angle lens comprising: a first lens, a second lens, a third lens, a fourth lens and an aperture, characterized by: starting from the object side The first lens, the second lens, the third lens, the aperture and the fourth lens are arranged in sequence, and the first lens and the second lens are negative half meniscus lenses convexly facing the object side, the first lens The three lenses and the fourth lens are lenses having convex surfaces on both sides; in addition, at least four of the mirror surfaces of the first lens, the second lens and the third lens are aspherical surfaces, and the mirror faces of the fourth lens are both non-spherical Spherical. 2. The wide-angle lens according to claim 1, wherein the composite focal length of the first to the second film is f123 'the overall focal length of the wide-angle lens is f ' and &quot;~15· 0 &lt; f 123 /f &lt; -8· 〇. 3. The wide-angle lens of claim 1, wherein the composite focal length of the first to third lenses is fm, the focal length of the fourth lens is L, and -6·5 &lt; f i23/f4&lt; 3. The wide-angle lens of claim 1, wherein the composite focal length of the first to third lenses is f4, the focal length of the fourth lens is f4, and the overall focal length of the wide-angle lens is f, and -15· 〇&lt; fm/f &lt;-8. 〇,—6 26 200848778 f 123/f4<~3· 〇0 b. The wide-angle lens described in the item: the radius of curvature of the mirror near the object side is r5, and the mirror curvature of the other side is: r6, and 〇·6&lt; (r6+r5) / (r6-r5) &lt;!· Hey. f 6·If you apply for the patent scope! The wide-angle lens according to the item, wherein a radius of curvature of a mirror surface of the first lens near the object side is r8, and a radius of curvature of the mirror surface of the other side is r9, and -〇·55&lt; (r9+r8) / (r9-γ8) &lt;~ 〇·45. XI. Schema: 27