TWI355503B - Hybrid lens system - Google Patents

Description

1355503 Japanese nuclear replacement page in August, 100 [0004]

094132039 VI. Description of the Invention: [Technical Field to Which the Invention Is Applicated] ′ - ιυο, [0001] The present invention relates to a closed lens system, and more particularly to a compound lens system that can be used in a mobile phone. [Prior Art] [0002] A conventional digital camera lens can be divided into a full glass lens (Glasses)

Lens), piastic Lens, and hybrid hybrid lens (Hybrid Lens). [0003] When a digital camera lens is applied to a mobile phone, it is difficult to achieve a light weight "low cost" requirement due to the large weight and high cost of the all-glass lens. Although the all-plastic lens has the advantages of light weight and low cost, it is easily affected by the external environment, and its plastic lens that is in contact with the outside world is inferior in temperature resistance and damage resistance. In the traditional glass-plastic hybrid lens, the glass lens It is different from the position of the plastic lens. In the glass-plastic hybrid lens, it includes a front positive lenticular lens and an intermediate negative double concave lens in the order from the object side to the image side. Double convex lens. The front positive lenticular lens and the intermediate negative double concave lens are made of a plastic material 'and the two lenses have an aspherical surface'. The positive positive lenticular lens is made of a glass material. A lens made of a plastic material with an aspherical lens reduces the cost and the 4 division of the filial piety. However, the glass-plastic hybrid lens is made up of a lens that is in contact with the outside, so that the temperature is resistant to the injury, and the monthly b is poor. Compared with a conventional digital camera, the mobile phone has a small holding area. Hand ^ α, Τ 更 谷 谷 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易 易0006] [0007]

100 years. August 03, Jun is replacing W. The probability is increased. * It is easy to scratch plastic lenses. In another type of glass-plastic hybrid type • · · · · · · · · · · · · · · · · · , , , 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头 镜头Both the lens and the second lens are spherical glass lenses. The third lens is a plastic lens that is aspherical on both sides. Although this lens can basically meet the requirements of imaging, its resolution is low, and it is difficult to meet the requirements of the southern resolution lens. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a compound lens system that is resistant to abrasion, has a small impact on the environment, and is suitable for use in a mobile phone. In addition, it is necessary to provide a composite lens system with good optical imaging performance. A composite lens system comprising: a first lens made of glass, a second, a third, and a fourth lens made of plastic, in order from the object side to the image side, wherein the first and third lens systems have a positive focal length a lens of a value, the second and fourth lenses are lenses having a negative focal length, the first, second, third, and fourth lenses have an aspherical structure, and the first lens has first and second surfaces, first and second Both surfaces are convex with an aspherical structure. The second lens tool has a third surface and a fourth surface, the third surface has a concave surface of an aspherical structure, and the fourth surface has a convex surface of an aspherical structure. The third lens has fifth and sixth surfaces, and the fifth and sixth surfaces each have a convex surface with an aspherical structure. The fourth lens has a seventh and eighth surface, and the seventh and eighth surfaces are both 094132039. Form No. A0101 Page 4 / Total 20 pages 1003281587-0, 1355503 100 years. 08 Body 03 correction _ page surface Θ (mmV |S] £E(nun)^ Tongguang Dongluo (mm) The quadratic curve makes the film "> .00^3: ^ P - 〇P 0; 03398873P 1.967867^ CM The first face is 7.31215243 1.358034PP 2.04802 buckle second surface Θ -2.571817*3 0.6735465^ 2.65956 buckle Op third table -1.527524P 0.6008621^ p 2.69724P CM ® should p the first Cfl surface Θ -6.545839^ 0.6766579^ 3.<31644^ OP夺面Θ 450825 知1.77037245 P 433742543 0*3 sixth surface *3 -2.370574P 0.7833835^ 4.166895^ seventh in the face Θ • 2.1 coffee 37P 1.033449P 4.150936^ eighth surface Θ 1351974P P 0.^39849^ 5.81651V Cl ·3 诹4 4〇4fl V* 6.420395P 〇p «3 [0008], the aspherical coefficient is: First " ft Yin 萆 A* face. ¥三表尹.. :第λ*面·第面, seventh * ftf : the first > \ *. face 4 eg electricity one -0.019578- ^0:014634 0.058616« 0.0135062 ^.016941 0.02397ί8 Mxaiyiino. -0.007370696^ .' Six-G.diim -0;0ίί064 0.0015724 -0:0(31376 0:0030891 -0.0007 U >0.006125D054 -0.001067225.- 八和p.0Q6^S22 0.0064993 0.000778^ 4)b〇02 must•0.0003砂0.0005755 Ο.ΟΟί 匆0.000188819^ •0.006975- -0.00292l· 0;000902< ^,000234 1.918E-05 8.638Ε^5 -8;2829 ί&〇5 -ί.46778Ε-05

[0010]. [0011] Compared with the prior art, the lens of the composite lens system in contact with the external environment is made of glass, and the other lenses are made of a low-cost plastic aspherical lens. It is suitable for mobile phones due to its impact on friction, scratch resistance and the use environment. [0012] Further, the first, second, third, and fourth lenses of the composite lens system are improved in design, and have a resolution of up to four million pixels, and have good optical imaging performance. [Embodiment] Referring to a first embodiment, a composite lens system 100 ′ according to an embodiment of the present invention includes: a first lens 1 〇 and a second lens 20 arranged in order from the object side to the image side. The third lens 30 and the fourth lens 40. In addition, the first 094132039 form number A0101 page 5 / total 20 pages 1003281587-0 1355503 l〇tf year. August 03, according to the object side of the positive lens 10 is provided with a light barrier 5 〇, the image of the fourth lens 40 The side of the side is set with a tablet element.) Niu 6 0 No Shadow | Sensor ί 7 ί) Head [0014]

I lens 10 is a lens with a positive focal length, made of a glass material having a refractive index and a dispersion of η ΐ = 1·58313, ν1 = 59.4, and the first and second surfaces 11, 12 are convex, first The surface 11 or the second surface 12 may be plated with & a line cut-off film to eliminate the influence of infrared rays on the image quality. The preferred glass material for the first lens of this embodiment is L-BAL42, which has resistance to abrasion, abrasion, moisture and heat. The second lens 20 is a lens having a negative focal length, and is made of an optical plastic material having a refractive index and a dispersion of η2 = 1.60726 and ν2 = 26.645, respectively, and the third surface 21 is a concave surface, and the fourth surface 22 is a convex surface. The preferred plastic material of the second lens 20 of this embodiment is 0KP4. The third lens 30 is a lens whose positive focal length is made of an optical plastic material having a refractive index and a dispersion of η =1.53116, v, 56. 04, respectively, and the fifth and sixth surfaces 31 and 32 are convex. . The fourth lens 40 is a lens having a negative focal length, and is made of an optical plastic material having a refractive index and a dispersion of % = 1.53116 and v4 = 56.04, respectively, and the seventh and eighth surfaces 41 and 42 are concave. . The preferred type of plastic material for making the third and fourth lenses in this embodiment is E48R. [0015] The light barrier 50 is used to limit the beam aperture through the first, second, third, and fourth lenses 10, 20, 30, 40 and to limit the field of view. The flat panel component 60 can be made of a transparent glass material, and the image sensor 70 can be a CMOS (Comp 1 einentary Metal-Oxide Seraicon duct-or) or CCD (Charge Coupled Device) image sensor, and a digital camera lens for a general mobile phone. Image sensors are usually CMOS due to cost considerations. The preferred CMOS diagonal half in this embodiment 094132039 Form number A0101 Page 6 of 20 1003281587-0 1355503

100 years. August 0. 3, the revised replacement page is 3·18mm, that is, 1. The image height of the 〇 field of view is 3. 18 (1. 〇 = 3 18mm, which can reach the resolution of the 苜 苜 画 。 。. The plate member can be used to prevent dust from contaminating the image sensor 70. The first parallel surface 61 or the second parallel surface 62 can be plated with an infrared cut-off film to eliminate the influence of infrared rays on the image quality. A preferred type of glass material for making a flat 70 piece 60 is B270. The specific situation of the composite lens system 100 is as shown in Table 1: [0016] Table 1 composite lens 'system, unified planning by the leather year R · (m «〇P 屏茂问泛(rnm)« 通光直裆fmmV Quadratic curve you &(Κ)^致' Sheet Seto CO 43 ea4^ 43 0.03398873 1,967867^ .,,,,,,,,,,,,,,,,,,,,,, 3 1.358034^ >> 2.048028^ OP I. Face ρ -2.571817^ 0.6735465· 2:659565^ OP .. Third at ft*3 -1.527524^ 0.6008621^ 2,69724^ -.-..· Of iff( PKP4y . ¢3 surface e -6.54383SM 43 0.6766579* 3.«1644P O43 . Section: 丘 '表4.508254^ 1770372^ 4.33742^ P4" S9(E48R)43. Sixth face 43 -2,370574^ 0.78338334 4.16689 If 0+ The seventh table - 2.180Q37V 1:033449^ 4.150936iP The eighth surface β 135197443 > · «3 0.2239849« .3.816513^ OP 苐 - Parallel CD «3 · 6.11174445 Qf Broken ang ($27〇^ Second parallel 00^3 04358876 ^ , 6.251O0V fit®*3 eb#3 6.420395^ P43 V gun length 4 8,1.4016) 523^/ [〇〇18] In the composite lens system 100, the first lens 1 and the first surface 11 of the first lens 1 12, the third and fourth surfaces 21, 22 of the second lens 20, the fifth and sixth surfaces 31, 32 of the third lens 30, and the seventh and eighth surfaces 41, 42 of the fourth lens 40 have non- Spherical structure, the surface of the aspherical structure can be expressed by the following formula: [0019] *Υ 1003281587-0 094132039 Form No. Λ0101 Page 7 / Total 20 Pages 1355503 100 years. 08月0·3»Replacement Replacement Page 6m +A8*Y-8+A1{)Hibiscus~10+...where, [0020] X: the depth of the section on the mirror surface; — [0021] Υ: the vertical distance of the mirror from the optical axis; [0022] ] Κ : quadratic curve coefficient; [〇〇23] A4, A6, A8, AIQ: aspherical fourth-order, sixth-order, eighth-order, ten-order coefficient 9 [0024] R: radius of curvature of the aspherical vertex.

[0025] Their respective aspherical coefficients are shown in Table 2:

[0026] Table 2 lens aspheric coefficient system bath, first surface 114J surface second surface 214 is also & 2243 fifth surface 31 ^ 豕 six surface 32 ^. seventh surface - eighth surface a 42 ^ > A4P -0.019378^ -0.014654 0.0586164 0.0135062 -0.016941^ 0.0239768 0:025337724? 4).0073706904 A643 -0.012724 ^0.011064 0.0015724 -0.001376- 0.0050891 -0.00071* .0.006123005« -0.0010672254 A84 0.0069822 0.ϋ06^93 0.0007784 0.0002Ώ · -0.000369^ 0.0005735 0.001598584^ Ό:000188819ι: Al.O^ -0.00697^ -0'00292-l· 0;:0009024 -0,000234 I;918E^05 8.638^03 -8^8295B-Q5 - ί. 46 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。. When the composite lens system 1 is used for photographing, the light incident from the object side is restricted by the light column 50, and part of the light beam is concentrated by the first lens 10, is incident on the second lens 20, is diverged by the second lens 20, and is incident to the second lens 20. The third lens 30, the third lens 30 re-converges the partial incident beam and then projects on the plate member 60 through the fourth lens 40. The plate member 60 refracts the beam twice and projects it to the image sensor 70 » [0028] Referring to the second, third, fourth and fifth figures, respectively, the optical performance of the composite lens system 100 is shown, wherein: 1003281587-0 094132039 Form No. A0101 Page 8 / Total 20 Page 1355503 [0030]

[0031] [0032] The 100-year-August-Nikkei nuclear replacement page is in the phase contrast and image height graphs shown in the second figure, and its image height is from the center to the edge of the image, that is, the horizontal seat. The correlation value of 1 8 can reach '0.5 or more, which indicates that the composite lens system 100 can still ensure a high degree of contrast at the edge of the image. In the field curvature graph shown in the third figure, the two represent the amount of error (cross-width) corresponding to the change in the radial (S) and tangential (Τ) as the image height (ordinate) changes. The image height is 3.18mm, and the edge error of the image is less than 0. 10mm, which means that the edge of the image can still guarantee a lower error amount, that is, the field curvature remains small at the edge of the image. . In the distortion diagram shown in the fourth figure, the distortion (abscissa) varies with the image height (ordinate), and the distortion is less than 0. 5% at the height of the entire image, which is much lower than the general requirement. ±1%, which means that the image formed by the composite lens system 100 has a small change in the image. The half of the diagonal defining the effective area of the CMOS is the maximum image height, and is set to 1.0 field field. To measure the spatial frequency of different image heights, take 1.0 field of view and 0 field of view. In this embodiment, the CMOS diagonal half is 3.18 mm, that is, the image of the 1.0 field of view is high, and the image height of the 0 field of view is Omm, which is the CMOS center point. In the MTF (Modular Transfer Function Modulus Transfer Function) graph shown in the fifth figure, the wavelength range of the light to be tested is 460 nm to 656 nm. The top three pairs of virtual solid curves S1, T], s2, τ2 , s3, 'respectively indicate that the spatial frequency is 901p/mm (line pairs/mm, that is, the logarithm of black and white lines that can be displayed per mm of length), 1201p/mm and 20 01p/mm of object point light passing through the composite lens Radial, tangential MTF values imaged after system 100. 094132039 Form No. A0101 Page 9 / Total 20 pages 1003281587-0 1355503. [0033] ί元伊1〇〇'08: Month; 03日正正_page where 901ρ/ππη spatial frequency west line S3, Τ3 in image The edge of the field is close to 1.0. The position of the MTF is close to 20%, and the dog is placed at 40% of the field of view. The 1201p/mm spatial frequency curve S2, Τ2 is close to 1.0 at the edge of the image. The position MTF value is close to 40% 'the MTF is greater than 60% at the 0 field of view; the 200 1p/mm spatial frequency curve, 'the edge of the image is close to 1.0. The position of the field of view is close to 50% of the MTF value' at the 0 field position MTF is greater than 70%. This indicates that the composite lens system 100 satisfies the resolution requirements.

[0034] It can be understood that, due to the calculation accuracy, the data given in Table 1 takes six digits after the decimal point, but after rounding off, the range of two decimal places is still within the scope of the creation. The aspherical coefficients given in Table 2 take ten decimal places, but after rounding off, the range of four decimal places is still within the scope of this creation. The refractive index of each of the lenses is taken to be five digits after the decimal point, but after rounding off, the two spheres after the decimal point are still within the scope of the present invention. The composite lens is not limited to use in a mobile phone, and can be applied to other portable electronic devices such as a camera, a PDA (personal digital assistant) and the like. [0035] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. It is to be understood that the above-mentioned preferred embodiments of the present invention are intended to be included within the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS [0036] The first figure is a schematic diagram of lens arrangement of the composite lens system of the present invention. [0037] The second figure is a phase contrast graph of the first lens composite lens system. [0038] The third figure is a field curvature curve diagram of the first lens composite lens system. 094132039 Form No. A0101 Page 10 of 20 1003281587-0 1355503 [0039] 100 years. August 0. 3 correction replacement page The fourth picture is the distortion curve of the first figure compound lens system. Only; the fifth picture is: the first picture of the ^ lens system 1 〇 曲 & picture '.

[Major component symbol description] First lens: 10 [0042] First surface: 11 [0043] • Second surface.: 12 [0044] Second lens: 20 [0045] Third surface: 21 [0046] Fourth surface: 22 [0047] Third lens: 30 [0048] Fifth surface: 31 [0049] Sixth surface: 32 [0050] Fourth lens: 40 [0051] Seventh surface: 41 [0052] Eight surfaces: 42 [0053] Light bar: 50 [0054] Plate element: 60 [0055] First parallel face: 61 [0056] Second parallel face: 62 [0057] Image sensor: 70 Form number ΑΟ 101 094132039 11 pages / total 20 pages 1003281587-0 1355503 100 years. August 0. 3 shuttles _ page [0058] Compound lens system: 100 094132039 Form number A0101 Page 12 / Total 20 pages 1003281587-0

Claims (1)

August 3, 1100, Revised Keys ^Page I Patent Application Range: A composite lens system comprising: a first lens, a second lens, a third lens and a fourth lens in order from object to image The first first-shift lens is a lens having a positive focal length, and the second and fourth lens are lenses having a negative focal length, and the improvement is that the first lens is made of glass, the second and the second The third and fourth lenses are made of plastic, and the first 'second, second and fourth lenses have an aspherical structure, wherein the first lens has a first first surface' a convex surface of the aspherical structure, the second lens has a third surface, a third surface having a concave surface of an aspherical structure, and a fourth surface having a convex surface of an aspherical structure; the third lens having a fifth surface a sixth surface, the fifth surface and the sixth surface each having a convex surface having an aspherical structure; the fourth lens has a seventh surface and an eighth surface, and the seventh and eighth surface islands each have a concave surface with an aspherical structure, wherein the composite The lens system parameters are: ^'- Qu Qu Beer (mitiV * find as a coffee fS\ pass first pa. CmmV. secondary politician ft sheet 铒e -- «0 4*. 0> 〇t*. v> 十例十c〇AP 0.03398873^ 1:967867〆0^.: v* 7.312152^. :L338Q34^ p 2:0480284 τ2.3718Ϊ7^ *> 0.673M65P 2.65956V 0+1 A**5 is a table -1.52752Φ3 0.600862143 2:69724^. 〇P -6.545839^ «3 0.6766579^ 3.431644^ ¢¢^ • 丘丘衣¢) 4ί508234Ρ L770372P 4:337425P ..第六六0, , -2:37057Φ3 Λ .0.783立33^ 4.16689^ DP 史舟4 -2.180037- 1.033445Μ 4.150956^ The eighth table ftp 1351974*3 Ρ 0.2239849P 5.816513P history, αοθ 43 43 6.420395^ 0*3 , the aspherical coefficient is: the first table 3b the second table al · the third table ft, (9th table ab - the first table fi. sixth table δ' seventh table® θ. eighth table®p -0.019578. -0014654 0.058616« 0.0135062 •0.016941 0.023976S 0,0253377243 -Ο.ΟΪ373706964 ^:13⁄443 ^ 012724- 4}m\Q6A> 0001572, -0.001376 0.0050S91 4).00071* 4).006123005^ -0.001067225* 0.0069822 0.006^93 0.000778« -0.000243· 410003 sand 0.0005755 0.001598 5ΕΦ; .0:00018^819^ """1^ 4).006975^ 4).00292l· 0.000902« -0.000234 1.9Ι8Ε4Ϊ5 S.63S&O5 ·8<28295Ε05 AAsrmos Form nickname A0101 Page 13 / Total 20 pages 1003281587-0 1355503 100 years. August 03 shuttle replacement page 2 · As claimed in the patent scope: the composite lens system described in the first head, wherein the first lens used for the model of the lens is L-BAL42; The second lens uses a plastic type of 0KP4, the second lens uses a plastic type E 4 8 R, and the fourth lens uses a plastic type E48R. The composite lens of the first lens is made of a glass material having a refractive index of 1.58 and a dispersion of 59.4. 4. The composite lens system of claim 3, wherein the plastic material used in the second lens has a refractive index of 1.61 and a dispersion of 26.645 5 . The composite lens system of claim 4 The refractive index of the plastic material used in the third and fourth lenses is 1.53, and the dispersion is 56.04. 6. The composite lens system of claim 1, wherein at least one surface of the first lens is plated with an infrared cut-off film. 7. The composite lens system of claim 1, wherein the composite lens further has a light barrier, a flat panel component, and an image sensor for preventing dust from contaminating the image sensor. 8. The composite lens system of claim 7, wherein the flat element has first and second parallel faces that are parallel to each other. 9. The composite lens system of claim 8, wherein the flat member is made of flat glass, and at least one of the first and second parallel faces is plated with an infrared cut-off film. 10. The composite lens system of claim 8, wherein the first and second parallel plane parameters are: 094132039 Form No. A0101 Page 14 of 20 1003281587-0 1355503 094132039 100 years 0& month corrections replacement page pot noodles face pregnancy semi-individual (mm)*3 screen (mm)*3 /SI light straight 硿 (mmV* secondary line system & (ϊζΗ 片 材料 material Ρ First parallel surface Peop 0.5543 6.111744^ Ο*3 Glass 瑀 (B27C[^ Second 行 Θ ooP 0.4338876^ 6.25100 Egg form number A0101 Page 15 / Total 20 pages 1003281587-0