TWI351529B - Wide lens - Google Patents

Description

1351529 v · January 11th, 100th revised replacement page* IX. Description of the invention: 1' [Technical field of invention] « The present invention is a wide-angle lens having a first lens, a second lens, and a first order The three lenses, the aperture and the fourth lens, and in particular, a solid image for use on a monitor or a car, with a viewing angle of up to 140. Super wide-angle lens. [Prior Art] In the past, the biggest problem in the design of wide-angle lens is that the image of the object will be plagued by the distortion of the image after the optical action of the lens, and in the past, only the spherical glass is used to correct the negative distortion of the image ( Or barrel deformation, that is, the closer the image is to the edge, the image will expand and the curve will be curved into an arc.) It is necessary to configure multiple negative meniscus lenses and positive meniscus lenses at the front end of the lens. When the angle of view is 80β, a lens that requires 8 to 1 〇 film requires 10 to 12 # when the lens is 100° or more, which causes the lens to be too long and too heavy. Therefore, with the advancement of optical plastic materials and the popularization of aspherical lens manufacturing technology, there are many small and lightweight mirrors, especially after the use of aspherical lenses. When the mouth | q μ, Saki's eight to 3 to 4 lenses, the lens angle of 100 ° 'as long as 4 to 5 pounds η, 妒 55, day a illusion film, lens angle of view 120. Above, only 1351529 V __ • · January 11th, 100th revision replacement page 'To 5 to 6 lenses, the lens is indeed small and lightweight. · In addition, as disclosed in the patent: 曰本专利专Super wide-angle lens of 2003-307674, wide-angle lens of Japanese Patent Laid-Open No. 2005-227426, wide-angle lens of Japanese Patent Laid-Open No. 2006-146016, wide-angle lens and image capturing device of Japanese Patent Laid-Open No. 2006-292988, Japanese Patent Special Opening 2007-025 The optical device 'the number of lenses used has indeed been reduced to 4 to 5, so the small and lightweight ^ is broken;

The problem of image distortion is still present in some corner lenses. The general lens is usually based on the projection method of y\f · tan6; to correct the distortion of the image as the image of the pixel, and f is the focal length. '(4) is a half-angle other shot: the mode also has a stereo projection method: y, = 2f · plus (Μ), equidistant projection: y, f · ω, etc. stereoscopic projection: y, = 2f · 3ίη (ω /2) and positive projective mode: y'=2f · , but by these formulas, ^ can be fixed at a fixed focal length f, with the increase of (four) and half-view, the inter-pixel y will also increase, when y When the value of / is too large, the image must be compressed, and the image around it must be compressed; it is inside, but this makes the image around the image difficult to distinguish. If the image on the 2 monitor is 'may be closed, the image mode _ cannot Seeing the face of the prisoner, = in the car (four) car surveillance secret, can be a week of the job to make the driver W slightly and slammed the items or children; 'the distortion of the lens, although the current image processing technology is quite advanced 1335129

On January 11th, 100th, the replacement page can be corrected by the technique of image processing to complement jt, but in the case of avoiding distortion, if the defect of peripheral image compression blur can be directly avoided, the development of wide-angle lens is still m, so the inventor himself With years of experience in the lens field, he has developed a wide-angle lens that avoids extreme image distortion and high sharpness in imaging. 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 third lens, an aperture, and a fourth lens, and - the lens and the second lens are convexly facing: a negative half meniscus lens on the side, the third lens and the fourth lens are lenses having a convex surface on both sides, and the mirror surfaces of the first lens, the second lens and the third lens At least four mirrors are aspherical, and the mirrors on both sides of the fourth lens are aspherical. With such a lens configuration, the effect of correcting the difference can be achieved with a minimum number of lenses; and the wide-angle lens is at a viewing angle 140. The incident light is affected by the negative refractive power of the first lens and the second lens, and is incident on the second lens at a gentle angle. However, the light emitted by the second lens has a negative distortion. = difference and magnification color difference 'which can be corrected by the positive bending of the third lens and the fourth lens, so that even at the viewing angle 14 〇. Under the super wide-angle condition, this wide-angle lens can also avoid the imaging week 1335129 _ * January 11 correction replacement page with the lowest number of four lenses, the image of the extreme image is distorted, and the image can have high sharpness. . • In addition, when the combined focal length of the first to third lenses is fm, and the overall focal length of the wide-angle lens is f, the following relationship is satisfied: -15. 0 &lt; f 123/f< _8. 0 • Because F123/f&gt;-8. 0, the negative refractive power of the first lens and the second lens will be too large, so that the image compression around the image is too large, it must be corrected by using image processing technology; when fm/f &lt; -15. 0, in order to introduce light of 140° angle of view, the outer diameter of the first lens must be relatively increased, which will increase the difficulty of miniaturization of the lens. When the focal length of the fourth lens is f4, the following relationship is satisfied: -6. 5&lt;fl23/f4&lt;_3. 0 Because when f123/f4&gt;-3.0, the positive refractive power of the fourth lens is lowered #low , you can not completely correct the negative distortion, you must use image processing correction; when f123/f4 &lt;-6. 5, the positive refractive power of the fourth lens will become too high, you must add a lens to be able to image. When the mirror radius of curvature of the third lens on the object side is r5 and the radius of curvature of the mirror side of the image side is r6, the following relationship is satisfied: 0.6&lt; (r6+r5) / (r6-r5) &lt;1.0 1351529 _ • Corrected replacement page on January 11, 100* Because (r6+r5) / ( r6-r5) &gt; 1. 0, the radius of curvature of the object side will become smaller, although it is helpful in correcting the distortion However, the correction effect of the non-point difference and the comet's aberration is reduced, which reduces the sharpness of the imaged image; when (r6+r5) / (r6-r5) &lt;0.6, it cannot Achieve a distortion that needs to be corrected. When the mirror radius of curvature of the fourth lens on the object side is r8 and the radius of curvature of the mirror surface is r9, the following relationship is satisfied: -0.55&lt; (r9+r8) / (r9-r8) &lt;- 0.45 Because (r9+r8) / (r9-r8) &gt;-0.45, the correction of the spherical aberration will be insufficient; when (r9+r8) / ( r9-r8) &lt; -0. 55, the spherical aberration There will be too many corrections, and the sharpness of the imaged image in the center of the face will become very low. [Embodiment] The embodiment of the wide-angle lens of the present invention is shown in Figs. 1 to 7, and is particularly useful for a lens having a viewing angle of about 140°, which can be applied to a monitor or a car, and Figs. 1A to 7A show Schematic diagram of various embodiments of the wide-angle lens, which are sequentially arranged from the object side to the image side as the first lens 1, the second lens 2, the third lens 3, the aperture 5, the fourth lens 4, the filter 6, the glass cover 7 and The imaging surface 8, wherein: the first lens 1 is a negative half meniscus lens having a convex surface facing the object side, and the modified second lens 2 is modified on the 11th of the 100th year as a negative half-moon shape of the convex surface toward the object side. The lens is a convex lens. The fourth lens is a lens with convex surfaces on both sides, and the four lenses 2, 3, and 4 are all plastic materials to save material cost, and the second lens 2 and the third lens At least four of the mirrors of the lens 3 are aspherical mirrors, and the two mirrors of the fourth lens 4 are aspherical surfaces, and the (10)6 and the broken glass are formed to form a filter 6 for blocking Infrared, the glass cover 7 is disposed on the imaging surface 8 to protect the CCD or CMOS And other components; in the embodiment, respectively, L1 (human (four) ().), 1 ^ person (four) 21 °), L3 (incident angle 35 °), L4 (incident angle 42), then the incident angle 49 n) , !^ incident angle 56. ) 吖 7 (incident angle π) - incident angle 7 〇. ) such as a kind of light, the angle of the person shoots the wide-angle lens, and is imaged 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 sufficiently shaped and correct. The image 'and the image is more sharp and sharp; and the 1B to 7B are the corresponding graphs of the 1A to 7A graphs, where (a) is a spherical aberration graph, where C line, d Line, e line, F line and g line respectively represent the difference of the different wavelengths of the ball-correcting surface, the unit is mm '( b) is the graph of non-dot difference', indicating the non-point difference of light of different wavelengths, the unit is s Representing the level of the difference, τ represents the vertical difference, (c) is the 歪 = the graph of the difference 'represents the distortion of the different wavelengths of light, the unit is /6. As can be seen from the figure, the wide-angle lens has received various kinds of The difference is correct enough to correct the replacement page usefulness of 13351529 January 11 100. In the following embodiments, the wide-angle lens has a focal length f, an aperture value of F NO., a viewing angle of 2 ω, and starts from the object side. The respective mirrors of the wide-angle lens are sequentially numbered, and the first lens 1 is sequentially The mirror surface is Sl, s2, the mirror surface of the second lens 2 is S3, S4, the mirror surface of the third lens 3 is S5, S6, the mirror surface of the aperture 5 is S7, and the mirror surface of the fourth lens 4 is S8. S9, the mirror surface of the filter 6 is S10, S11, the mirror surface of the glass cover 7 is S12, S13, and the formula of the aspherical mirror surface is · X = (1/R) H2 / {1 + [1-^1 +K) ^h/R)2],/2}+ah4+bh6+ch8+dh10 a, B, C, D are 祚 spherical coefficients ' Η is the height at which the optical axis starts' X is the displacement in the optical axis direction 'And X is the basis of the vertices of the face, R is the paraxial radius of curvature' Κ is the conic coefficient, and 系数 in the coefficient represents the scientific notation, such as Ε-03 means 1 (Γ3; • In the embodiment of the first ' diagram, 'f is 〇.868min' F NO. is 2.8, 2 ω is 140., and the radius of curvature r (unit surface), surface spacing d (unit mm), inflection rate nd, and inverse dispersion rate vd of each mirror surface are as shown in Table 1A below: 11 1351529 _ • January 11, 100 revised replacement page 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 CO 0.3 BSC7 S11 oo 0.22 S12 oo 0.4 BSC7 S13 oo

Table 1A Table 1B shows the aspherical coefficients of the mirror surfaces, and except that the mirror surface S1 of the first lens 1 is a spherical mirror surface, the mirror surface S2 of the first lens 1 and the mirror surfaces S3, S4 of the remaining lenses 2, 3, and 4, S5, S6, S8, and S9 are all aspherical mirrors, and the values of (, 8, 6, 0, 0 are as shown in the following table 18: 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 -1.5359E-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 -2.5238 E-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 1.10642E-04 D 0.0000 D 3.18772E-05 D -6.4109 E-05 12 1351529 _ • January 11th, 100th revised replacement page* L_ - -- --- --- • In this embodiment, the four lenses 1, 2, 3, 4 are made of plastic. • The filter 6 and the cover glass 7 are made of colorless optical glass (BSC7). The embodiment of Fig. 2A Where, f is 0. 881mm, F NO. is 2. 8, 2 ω is 140°, the radius of curvature r (unit: mm), the interplanar spacing d (unit 匪), the inflection rate nd, and the inverse dispersion ratio vd of each mirror surface are as follows Listing 2A shows: r D nd vd S1 30.933 1.319 1. 53 56.3 S2 4. 6259 2. 167 S3 24. 701 0.598 1. 53 56.3 S4 1.3649 1. 086 S5 3. 0326 3.003 1. 63 23.4 S6 -23.66 0 977 S7 〇〇0.847 S8 3. 7781 2.36 1. 53 56.3 S9 -1. 12 0· 5 S10 〇〇0.3 BSC7 S11 〇〇0.2 S12 〇〇0.4 BSC7 S13 〇〇

Table 2A 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, and in this embodiment, the four lenses 1, 2, 3, 4 are made of plastic, the filter 6 and the glass cover 7 are made of colorless optical glass (BSC7): 13 1351529 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 Modified replacement page on January 11, 100 In the embodiment of Figure 3A, f is 0. 885mm, F NO. is 2. 8, 2 ω is 140°, radius of curvature r of each mirror (unit: mm) The interplanar spacing d (unit 匪), the flexion ratio nd and the inverse dispersion rate vd are as shown in the following table 3A: 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 〇〇0. 768 S8 3.3993 2. 668 1. 53 56. 3 S9 -1. 104 0. 549 S10 oo 0. 3 BSC7 Sll oo 0.22 S12 oo 0.4 BSC7 S13 oo

Table 3A 14 1351529 _ - Modified replacement page on January 11, 100 - The following table 3B shows the aspherical coefficients of the mirrors. In this embodiment, the mirrors S3, S4, S5 of the three lenses 2, 3, 4, S6, S8, S9 are all aspherical • Mirror surface: 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 -1.2380E-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 NO. is 2.8, 2 ω is 140°, and the radius of curvature r (unit mm) of each mirror surface 'face spacing d (unit: mm), inflection rate nd and inverse The dispersion rate vd is shown in the following table 4A: 15 1351529 January 11th, 100th revised replacement page r D nd vd S1 33.156 1. 042 1. 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. 317337 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 -5.7570E -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 1351529 _ • January 11, 100 The replacement page is modified - and in this embodiment, the four lenses 1, 2, 3, 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. 5A, f is 0.987 mm, F NO. is 2.8, 2 ω is 140°, radius of curvature r (unit: mm), surface spacing d (unit_), inflection rate nd, and inverse of each mirror surface The dispersion rate vd is shown in the following table 5 A: r D nd vd SI 31.Oil 0. 97 1. 53 56. 3 S2 4. 609 2. 093 S3 46.207 0.599 1. 53 56. 3 S4 1.4464 1. 128 S5 3.4039 3. 001 1. 69 22.5 S6 -19. 37 0. 977 S7 〇〇0. 926 S8 3. 6273 2. 588 1. 53 56. 3 S9 -1.255 0. 5 S10 〇〇0. 3 BSC7 Sll oo 0 . 2 S12 oo 0.4 BSC7 S13 oo

Table 5A 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 shown. , S8, S9 are all aspherical mirrors, and in this embodiment, the four lenses 1, 2, 3, 4 are made of plastic, the filter 6 and the glass cover 7 are made of colorless optical glass (BSC7): 17 1351529 January 11th, 100th revised replacement page 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 0024128 A 3.20657E-04 B -3.2659E -05 B 5.70299E-05 B -1.1978E-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. 003 mm, F NO. is 2. 8, 2 ω is 140°, radius of curvature r (unit: mm) of each mirror surface, surface spacing d (unit: mm), inflection rate The nd and inverse dispersion rate vd are shown in the following table 6A: 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 〇〇0. 922 S8 3. 6996 2. 6 1.53 56.3 S9 -1. 26 0. 5 S10 〇〇0.3 BSC7 Sll oo 0 . 2 S12 oo 0.4 BSC7 S13 oo

Table 6A 18 1351529 _ • January 11th, 100th revised replacement page Table 6B 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 remaining lens 2 The mirrors S3, S4, S5, S6, S8, and S9 of 3, 4 are all aspherical mirrors: S2 S3 S4 S5 K -0.3197 K -14138. 1 K -2.83595 K -0.02563 A -3.8715E-04 A -2.9065 E-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. 19092E- 04 c 1.85755E-07 D -5.8638E-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. 819mm, F NO. is 2. 8, 2 ω is 140°, radius of curvature r (unit: mm), face spacing d (unit_), inflection rate of each mirror surface The nd and inverse dispersion rate vd are shown in the following list 7A: 19 1351529 January 11, 100 correction replacement page 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 〇〇

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 -2.8160 E-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 January 11, 100 revised replacement page and in this embodiment, the three mirror months 2, 3, 4 are made of plastic, the first lens 1, the filter 6 and the glass cover 7 are colorless optical glass (BSC7) made. As can be seen from the foregoing, the wide-angle lens is composed of four lenses 1, 2, 3, and 4, and the incident light will first adjust the incident angle of the light through the first lens 1 and the second lens 2 to make the light angle more moderate. Then, the light is incident on the third lens 3, but the light passing through the second lens 2 still has a large negative distortion, a non-point difference, and a magnification, so in the first to third The composite focal length of the lens is fl23, and when the overall focal length of the wide-angle lens is f, the following relationship must be satisfied: Relation 1: -15. 0&lt;fm/f&lt;-8. 0 Because when fm/f&gt;-8.0, The negative refractive power of the first lens and the second lens may be too large, so that the image compression around the image is too large, and the image processing technology must be used to correct; when fmMC-lS.O, the light is introduced into the viewing angle of 140°. The outer diameter of the first lens must be relatively increased, which will increase the difficulty of miniaturization of the lens. When the focal length of the fourth lens is f4, the following relationship is satisfied: Relation 2: _6. 5 &lt; f i23/f4&lt; ·~3. 0 Because when f123/f4&gt;-3.0, the fourth lens If the positive refractive power is reduced, it will not be able to completely correct the negative distortion. It must be corrected by image processing. 1351529 Volume 11丨 Correction replacement page m/fd 5 'The fourth lens's positive flexion ^^^^ needs to be increased by 1 (four) Only after the (four) New Zealand and the independent material are used to determine the positive refractive power of the second lens 3 can solve the aforementioned problems. On the image side, and when the mirror radius of curvature of the mirror radius of curvature of the third lens approaching the object side is r5, the following relationship is satisfied:

Relation 3: 0· 6 &lt; ( r6+r5 ) / ( r6-r5 )< 1 〇 Since (r6+r5)/(r6-r5) &gt;1.0, the radius of curvature of the object side becomes smaller, although It is helpful to correct the distortion of the distortion, but the correction effect of the non-point difference and the difference of the comet aberration is reduced, which reduces the sharpness of the imaged image; when (r6+r5) / (r6-r5 ) &lt;0.6, it is impossible to achieve the distortion of the distortion that needs to be corrected. Since the light is incident on the fourth lens 4 after being refracted by the first lens 1, the second lens 2 and the third lens 3, it can be seen that the fourth lens 4 is the main lens for imaging the wide-angle lens, so the following relationship can be Determining the shape of the fourth lens 4' When the mirror radius of curvature of the fourth lens on the object side is r8 and the radius of curvature of the mirror side of the image side is r9, the following relationship is satisfied: Relation 4: -0. 55 &lt; ( r9+r8 ) / ( r9-r8 ) &lt; -〇. 45 Because (r9+r8) / (r9-r8) &gt;-0.45, the correction of the spherical aberration will be insufficient; when (r9+r8) / (r9-r8) &lt;-0.55, the spherical surface difference 22 1351529 L100 January 11 correction correction page will be too much correction, the image of the central image of the kneading surface is in line with the fourth lens 4 of the relationship 4, with Yi #九' is characterized by its aspherical features, which keeps the image in the middle and periphery of the image clear and complete. The numerical implementation of the relational expression is as follows in the following Table 8: Example 2 Your package example 3 Hybrid 4 Hybrid 5 Example 6 fto/f -9.42 -10.7 -8. 25 -13. 7 -12. 2 -11. 6 -8.47 im /ΪΑ •4. 14 -4. 77 ~3. 66 -6. 28 -5. 53 '5. 31 -3. 60 (r6fr5)/(r6-r5) 0. 88 0. 77 0. 96 0. 68 0. 70 0. 75 0. 96 (r9fr«)/(r9-r«) ~〇. 54 -0. 54 -0. 51 -0.48 -0.49 -0. 49 -0.53 Table 8 shows that the wide-angle lens even The viewing angle is as high as 140. By using only four lenses, it is possible to avoid extreme distortion of the periphery of the image and to make the image sharp and sharp, so it is quite suitable for monitors and automotive lenses.

23 1351529 _ - January 11, 2011 Revision Replacement Page » -- [Simplified Schematic Description] Fig. 1A is a schematic view showing the structure of the 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. Fig. 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. . • Fig. 4A is a schematic view showing the structure of a fourth embodiment of the present invention. Fig. 4B is a schematic view showing the spherical, non-dot and 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, non-dot and 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. • Fig. 7B is a schematic view showing the spherical, non-dot and distortion of the seventh embodiment of the present invention. . [Description of main component symbols] "Invention" First lens 1 Second lens 2 Third lens 3 24 1351529 _ - January 11, 100 correction replacement page Fourth lens 4 • Aperture 5 • Septa glass 6 Glass cover 7 Imaging Face 8

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Claims (1)

1351529 _ • January 11th, 100th Revision Replacement Page 10, Patent Application: 1. A wide-angle lens comprising a first lens, a second lens, a third lens, a fourth lens and an aperture 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 convexly facing the object side. a negative semi-bent lens, the third lens and the fourth lens are lenses having convex surfaces on both sides; • at least four of the mirror surfaces of the first lens, the second lens and the third lens are aspherical, The first lens to the third lens is aspherical, and the composite focal length of the first lens to the third lens is, the overall focal length of the wide-angle lens is f, and -15. 0&lt; fm / f &lt; - 8. 0. 2. A wide-angle lens comprising a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein: 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, and the third lens and the fourth lens are both sides a convex lens; in addition, at least four mirror surfaces of the first lens, the second lens, and the third lens are aspherical surfaces, and the mirror surfaces of the fourth lens are aspherical, and the first lens to the third The combined focal length of the lens is fm, the fourth lens focal length is 26 1351529 _ • January 11th, 100th revised replacement page • The distance is f4, and _6. 5&lt;fl23/f4&lt;_3. 0. 3. A wide-angle lens comprising a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein: the first lens, the second lens, and the first lens start from the object side The three lenses, 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, and the third lens and the fourth lens are both sides a convex lens; in addition, in the mirror surfaces of the first lens, the second lens, and the third lens, to a minimum of four mirror surfaces are aspherical surfaces, the mirror surfaces of the fourth lens are aspherical, and the first lens is The combined focal length of the third lens is fm, and the focal length of the fourth lens is (4, the overall focal length of the wide-angle lens is ", and -15.0&lt;[123/^&lt;-8.0, -6. 5 &lt; f 123/f 4 &lt; -3. 0. 肇 4. 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 The 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 third lens and the fourth lens are lenses having convex surfaces on both sides; and the first lens and the second lens In the mirror surface of the lens and the third lens, up to 27 1351529 _ 磉 • January 11th, 100th revised replacement page, there are four mirrors that are aspherical, and the two mirrors of the fourth lens are aspherical, and the third lens The radius of curvature of the mirror near the object side is r5, and the radius of curvature of the mirror surface of the other side is r6, and 0.6 &lt; ( r6 + r5) / ( r6 - r5 ) &lt; 1. 0. 5. A wide-angle lens, which includes a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein: the first lens, the second lens, the third lens, the light circle and the first The four lenses are arranged in sequence, and the first lens and the second lens are negative half meniscus lenses convexly facing the object side, and the third lens and the fourth lens are both lenses having convex surfaces on both sides; In addition, in the mirror surfaces of the first lens, the second lens, and the third lens, The mirror surface of the fourth lens is aspherical, and the radius of curvature of the mirror on the other side is r8, and the radius of curvature of the mirror on the other side is r9, and -0.55 &lt; ( r9+r8) / ( r9-r8) &lt; -0· 45. 28