CN102566014A - Lens module - Google Patents
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- CN102566014A CN102566014A CN2010106004794A CN201010600479A CN102566014A CN 102566014 A CN102566014 A CN 102566014A CN 2010106004794 A CN2010106004794 A CN 2010106004794A CN 201010600479 A CN201010600479 A CN 201010600479A CN 102566014 A CN102566014 A CN 102566014A
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Abstract
The invention discloses a lens module, which consists of four optical lenses. The lens module comprises a first optical lens group and a second optical lens group. The first optical lens group comprises first optical lenses with negative diopter. Each first optical lens is provided with a first surface and a second surface, wherein the first surface faces an amplification side; the second surface faces a reducing side; at least one of the first surface and the second surface is a non-spherical surface. The second optical lens group is configured between the first optical lenses and the reducing side, and moreover, the second optical lens group comprises second optical lenses, third optical lenses and fourth optical lenses which are arranged in sequence from the amplification side to the reducing side. The diopter of the second optical lenses, the diopter of the third optical lenses and the diopter of the fourth optical lenses are positive, negative and positive in sequence, and moreover, at least two of the second optical lenses, the third optical lenses and the fourth optical lenses respectively comprise non-spherical surfaces. Moreover, the effective focal length of each third optical lens is f3, and the refractive index is Nd3, whereas the effective focal length of each fourth optical lens is f4. Moreover, the lens module meets the formula as follow: the absolute value of f3/(f4*Nd3) is greater than 0.45 but is less than 1.2.
Description
Technical field
The present invention relates to a kind of camera lens module, and particularly relate to four camera lens modules that lens are formed of a kind of use.
Background technology
Along with scientific-technical progress, micro projection camera lens (Projection Lens) becomes one of the main flow in market gradually.In general; The valuable feature of minitype projection machine is light source is made into the environmental protection power saving by traditional high-pressure sodium lamp (UHP) a LED lamp; Yet in volume-diminished, hope again to possess high brightness; This expression projection lens need have less numerical aperture (F number), and meaning promptly need be used the large aperture camera lens.Be accompanied by the aperture become big in, the size of the eyeglass in the lens head also can become greatly relatively, thus, the aberration of imaging picture can increase rapidly, so the degree of difficulty in optical design just can promote widely.
At present, prior art is to use aspherical lens to correct aberration more, or the quantity that increases eyeglass overcomes the problems referred to above, but so the practice can be run counter to the purpose that reduces manufacturing cost each other.In addition, use too much aspherical lens to improve the tolerance susceptibility possibly, and eyeglass quantity crosses and can make total system can't satisfy compactedness (Compact) at most, be difficult to really make the dimension shrinks of whole optics.
The TaiWan, China patent publication No. discloses a kind of projection lens No. 201003115, and this projection lens is comprised to dwindling end by enlarged ends successively: have negative power first lens, have positive light coke second lens, have the 3rd lens of negative power and have the 4th lens of positive light coke.Projection lens satisfies 3.7＜TT/f＜4 and BFL/f＞1.41, and wherein TT is the length overall of projection lens; BFL is the back focal length of projection lens; F is the effective focal length of projection lens.
The TaiWan, China patent announcement discloses a kind of projection arrangement number I258597 number, and it comprises the first optics group, aperture, the second optics group.The first optics group has first lens and second lens.First lens are the bending negative lens, and its convex surface is towards picture end, and second lens are plano-convex lens, and its plane is towards the thing end.The second optics crowd has the 3rd lens, the 4th lens, the 5th lens.The 3rd lens are biconcave lens, and the 4th lens are the bending positive lens.In addition, optics group satisfies 0.75＜f1/f2＜0.95, and wherein f1, f2 are the effective focal length of the first optics group and the second optics group.
The TaiWan, China patent announcement discloses a kind of tight shot number I315410 number, and it comprises first lens group and second lens group.First lens group has positive diopter, and first lens group is by forming from thing side to first lens and second lens that are arranged in order as side.Wherein, first lens are to have negative diopter and the convex surface meniscus lens towards second lens, and second lens are the biconvex lens with positive diopter.In addition, second lens group has positive diopter, and is disposed between first lens group and the picture side.Second lens group is by forming from thing side to the 3rd lens, the 4th lens and the 5th lens that are arranged in order as side.The 3rd lens are to have a negative dioptric biconcave lens, and the 4th lens are to have positive diopter and the convex surface meniscus lens towards the 5th lens, and the 5th lens are the biconvex lens with positive diopter.
The United States Patent (USP) notification number discloses a kind of projection lens No. 6124978, and it comprises that convex surface is towards first lens of the positive curved month type of enlarged ends, convex surface the 4th positive lens L4 towards the different biconvex of the diopter on the 3rd negative lens of the different double concave type of the diopter on second lens of the negative curved month type of enlarged ends, two surfaces, two surfaces.
The United States Patent (USP) notification number discloses a kind of projection lens No. 7075622, and this projection lens comprises 6 lens.First lens have negative diopter; Second lens have positive diopter; The 3rd lens have negative diopter; The 4th lens are that compound lens has positive diopter; The 5th lens have positive diopter.Projection lens satisfies 0.3＜L23/L2-4＜0.5, and L23 is the distance of surface to the 3rd lens front surface behind second lens; L2-4 is the distance on surface behind the second lens front surface to the, four lens.
U.S. Patent Publication discloses a kind of wide-angle lens No. 20020196564, and this wide-angle lens is made up of four lens.Wide-angle lens comprises four lens of concave surface towards thing side and negative dioptric first lens of tool, second lens of tool positive diopter, negative dioptric the 3rd lens of tool and tool positive diopter.At least one surface of second lens is an aspheric surface, and the concave surface of the 3rd lens is towards thing side or picture side, and the convex surface of the 4th lens is towards as side and comprise an aspheric surface at least.Wide-angle lens satisfies following one of them formula at least :-2.0＜f/f1＜-0.5; 0.5＜f/f2＜2.0; 0.5＜f/f4＜2.0, wherein f representes effective focal length.
The United States Patent (USP) notification number discloses a kind of lens system No. 7679832, and it comprises the 3rd lens of negative dioptric first lens of tool, second lens of tool positive diopter, negative dioptric the 3rd lens combination of tool and tool positive diopter.Lens system satisfies: 0.3＜| f1/f2-4|＜1.0, wherein f1 representes the focal length of first lens, f2-4 representes the effective focal length of second lens, the 3rd lens combination, the 4th lens.
Summary of the invention
The present invention provides a kind of camera lens module, and it uses four lens can present preferable optical appearance (as: high resolution), and has low-cost and the less advantage of size simultaneously.
Other purpose of the present invention and advantage can further be understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or entirely purpose or other purpose, embodiments of the invention propose a kind of camera lens module, and wherein camera lens module is made up of four lens.Camera lens module comprises first lens group and second lens group.First lens group comprises having negative dioptric first lens.First lens have towards the first surface of Zoom Side and second surface towards reduced side, wherein first surface and second surface one of them is that non-ball is surperficial at least.Second lens group is disposed between first lens and the reduced side, and second lens group comprises second lens, the 3rd lens and the 4th lens that are arranged in order to reduced side from the Zoom Side.That the diopter of second lens, the 3rd lens and the 4th lens is followed successively by is positive and negative, just, and second lens, the 3rd lens and the 4th lens at least wherein two respectively comprise non-ball surface.In addition, the effective focal length of the 3rd lens is f
3And refractive index is Nd
3, and the effective focal length of the 4th lens is f
4, and camera lens module meet 0.45＜| f
3/ (f
4* Nd
3) |＜1.2.
In an embodiment of the present invention, the effective focal length of second lens is f
2, the back focal length length of camera lens module is BFL, and camera lens module meets 0.5＜BFL/f
2＜1.3.
In an embodiment of the present invention, camera lens module also comprises aperture diaphragm, and wherein aperture diaphragm is disposed between second lens and the 3rd lens.
In an embodiment of the present invention, first surface and second surface one of them is a concave surface at least.In an embodiment of the present invention, first lens are crescent lens or biconcave lens.
In an embodiment of the present invention, second lens, the 3rd lens and the 4th lens at least wherein two be non-spherical lens.
In an embodiment of the present invention, second lens comprise biconvex lens.
In an embodiment of the present invention, the 3rd lens comprise biconcave lens.
In an embodiment of the present invention, the 4th lens comprise biconvex lens.
In an embodiment of the present invention, the material of first lens, second lens, the 3rd lens and the 4th lens comprises glass or plastics.
In an embodiment of the present invention, first lens group is focusing crowd in order to move with respect to camera lens module, and second lens group is in order to fixed and be group of stability with respect to camera lens module.
In an embodiment of the present invention, first lens group and second lens group be in order to moving with respect to camera lens module simultaneously and to be the focusing crowd, and first lens group when moving with respect to camera lens module simultaneously with second lens group in order to the back focal length length of change camera lens module.
Embodiments of the invention have following one of them advantage.Since camera lens module satisfies 0.45＜| f
3/ (f
4* Nd
3) |＜1.2, just therefore can use four lens, and still can demonstrate preferable quality of optical imaging, as: improve camera lens module issuable aberration when forming images.In addition, because camera lens module uses four lens just can demonstrate preferable quality of optical imaging, so camera lens module just can have advantage low-cost and size little (as: miniaturization) simultaneously.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and conjunction with figs. elaborates as follows.
Description of drawings
Fig. 1 is the camera lens module structural representation of one embodiment of the invention;
Fig. 2 A to Fig. 2 D and Fig. 3 are respectively the image optics emulated data figure of the camera lens module of Fig. 1;
Fig. 4 is the camera lens module structural representation of another embodiment of the present invention; And
Fig. 5 A to Fig. 5 D and Fig. 6 are respectively the image optics emulated data figure of the camera lens module of Fig. 4.
[main element symbol description]
60: the image processing element
70: glass cover
100,200: camera lens module
110,210: the first lens
120,220: the second lens
130,230: the three lens
140,240: the four lens
150: aperture diaphragm
BFL: back focal length length
LG1: first lens group
LG2: second lens group
S1～S9: surface
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in following DETAILED DESCRIPTION OF THE PREFERRED, can clearly appear with reference to accompanying drawing.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are the directions with reference to accompanying drawing.Therefore, the direction term of use is to be used for explaining not to be to be used for limiting the present invention.
Fig. 1 is the structural representation of the camera lens module of one embodiment of the invention.With reference to Fig. 1; The camera lens module 100 of present embodiment is made up of four lens basically; Under the optical appearance that does not influence camera lens module 100; Camera lens module 100 itself also can have the travel mechanism that supports with the fixed mechanism of fixing these lens and mobile these lens; So that the imaging that camera lens module 100 can be focused and so on performance, wherein present embodiment focus on use four lens just can make camera lens module 100 present preferable image quality, so present embodiment does not specify these fixed mechanisms and travel mechanism.
The camera lens module 100 of present embodiment comprises the first lens group LG1 and the second lens group LG2, and is as shown in Figure 1.The first lens group LG1 comprises having negative dioptric first lens 110.First lens 110 have towards the first surface S1 of Zoom Side and second surface S2 towards reduced side, and wherein one of them is that non-ball is surperficial at least for first surface S1 and second surface S2.Particularly; First surface S1 and second surface S2 one of them adopts the design on non-ball surface at least the time; It can be in order to the aberration beyond the optical axis of eliminating camera lens module 100; For example be the aberration that improves coma (Coma) or astigmatism (Astigmatism) and so on, wherein specifically, more remarkable for the improvement of aberration of distortion (Distortion).In the present embodiment, first lens 110 can be the biconcave lens of concave surface towards Zoom Side and reduced side, have negative diopter simultaneously, that is to say, first surface S1 and second surface S2 can be respectively a concave surface, and be as shown in Figure 1.
In addition, the second lens group LG2 is disposed between first lens 110 and the reduced side, and the second lens group LG2 comprises from the Zoom Side second lens 120, the 3rd lens 130 and the 4th lens 140 that are arranged in order to reduced side, and is as shown in Figure 1.That the diopter of second lens 120, the 3rd lens 130 and the 4th lens 140 is followed successively by is positive and negative, just.In the present embodiment; Second lens 120 can be the biconvex lens of convex surface towards Zoom Side and reduced side; And having positive diopter simultaneously, the 3rd lens 130 can be the biconcave lens of concave surface towards Zoom Side and reduced side, and have negative diopter simultaneously; And the 4th lens 140 can be the biconvex lens of convex surface towards Zoom Side and reduced side, and are as shown in Figure 1.In addition, the camera lens module 100 of present embodiment also can comprise aperture diaphragm 150, and wherein aperture diaphragm 150 is disposed between second lens 120 and the 3rd lens 130, and is as shown in Figure 1.In the present embodiment, aperture diaphragm 150 can be used to limit the size of the bore of imaging beam, thereby can influence illumination, readability and the depth of field of picture.
In order to make camera lens module 100 under the framework that uses four lens, can present preferable quality of optical imaging; Therefore second lens 120, the 3rd lens 130 and the 4th lens 140 at least wherein two respectively comprise non-ball surface; That is to say that it two respectively is a non-spherical lens at least for second lens 120, the 3rd lens 130 and the 4th lens 140.For example, lens surface S3, S4, S5, S6, S7, the S8 of second lens 120, the 3rd lens 130 and the 4th lens 140 all can adopt aspheric design, and meaning i.e. second lens 120, the 3rd lens 130 and the 4th lens 140 is all non-spherical lens; Or; Aspheric design can be adopted in the surface of second lens 120, the 3rd lens 130 and the 4th lens 140 any two lens wherein; Another lens then can adopt the design of spherical lens; Meaning promptly second lens 120, the 3rd lens 130 and the 4th lens 140 wherein two can adopt non-spherical lens design, another lens then can adopt the design of spherical lens.In the present embodiment; The 4th lens 14 can be used to cooperate the 3rd lens 130 suitably to select for use the 4th lens 140 can improve the problem of the aberration (chromatic aberration) that camera lens module 100 produced effectively when forming images to correct light through the issuable aberration problems in the 3rd lens 130 backs, that is to say.
More than adopt the quantity of non-spherical lenses to decide about second lens 120, the 3rd lens 130 and the 4th lens 140 according to user's demand, above-mentioned being merely illustrates.In addition, the shape of above-mentioned first lens 110, second lens 120, the 3rd lens 130 and the 4th lens 140 is merely and illustrates, and in other embodiments, lens 110,120,130,140 also can have and are different from above-mentioned shape, looks actual situation and decides.In the present embodiment, if above-mentioned lens 110,120,130,140 adopt aspheric design, then its material can be to select glass material, but also can be the material of selecting plastic lens, so then can reach cost-effective purpose effectively.
In the present embodiment; The camera lens module 100 of present embodiment is divided into two groups with four lens 110,120,130,140; Wherein the first lens group LG1 is made up of 110 on first lens, and the second lens group LG2 then is made up of second lens 120, the 3rd lens 130 and 140 on the 4th lens.In the present embodiment; If when desiring to make camera lens module 100 to focus imaging, can focus (focus) through the spacing that changes between two lens group LG1, the LG2, or; While mobile lens crowd LG1, LG2, the back focal length length BFL that changes camera lens module 100 is to focus.In detail; If desire is through changing spacing between two lens group LG1, the LG2 so that camera lens module 100 when focusing; Then the first lens group LG1 is focusing crowd in order to move with respect to camera lens module 100, and the second lens group LG2 is in order to fixed and be group of stability with respect to camera lens module 100.In other words, move the first lens group LG1, and need not move the action that the second lens group LG2 just can make camera lens module 100 focus.
In addition; If desire changes the back focal length length BFL of camera lens module 100 through while mobile lens crowd LG1, LG2; So that camera lens module 100 is when focusing; Then the first lens group LG1 and the second lens group LG2 be in order to moving with respect to camera lens module 100 simultaneously and to be the focusing crowd, when wherein the first lens group LG1 and the second lens group LG2 move with respect to camera lens module 100 simultaneously in order to the back focal length length BFL of change camera lens module 100.In other words, through moving the first lens group LG1 and the second lens group LG2, the action that just camera lens module 100 is focused simultaneously.
In the present embodiment, can be provided with image processing element 60 (imageprocessing device) in reduced side.In the present embodiment; Image processing element 60 for example is light valve (lightvalve); And light valve for example is digital micromirror elements (digital micro-mirror device; DMD), silica-based liquid crystal panel (liquid-crystal-on-silicon panel, LCOS panel) or transmissive liquid crystal panel (transmissive liquid crystal panel, transmissive LCD).In addition, in the present embodiment, camera lens module 100 in order to video imaging that image processing element 60 is provided in the Zoom Side.Can be a kind of projection lens when in other words, camera lens module 100 is applied to projection arrangement.In another embodiment, camera lens module 100 can also be the camera lens that is used on the general camera, and meaning is that camera lens module 100 can be with the object image-forming that is positioned at the Zoom Side on the imaging surface that is positioned at reduced side.
Further, for the size (as: adopting four lens) that has miniaturization simultaneously concurrently and have quality of optical imaging preferably.Under the prerequisite of miniaturization camera lens module 100, camera lens module 100 satisfies following condition.
0.45＜| f
3/ (f
4* Nd
3) |＜1.2 (conditions one)
F wherein
3Be the effective focal length of the 3rd lens 130, Nd
3For example be the refractive indexes (but be not limited thereto) of the 3rd lens 130 under green-yellow light wavelength (as: 589nm), and f
4It is the effective focal length of the 4th lens 140.In detail, in camera lens module 100, if | f
3/ (f
4* Nd
3) |＜0.45, or, | f
3/ (f
4* Nd
3) |＞1.2, then the problem of the aberration that the time produced in imaging of camera lens module 100 just is difficult to obtain to correct effectively; Otherwise, the camera lens module of present embodiment 100 if can satisfy 0.45＜| f
3/ (f
4* Nd
3) |＜1.2 o'clock, then camera lens module 100 just can still can demonstrate preferable optical quality and performance under the situation that adopts four lens 110,120,130,140.In other words, camera lens module 100 can be taken into account outside the advantage of low-cost and size little (as: miniaturization), and preferable quality of optical imaging can be provided.
In addition, present preferable quality of optical imaging, so the also visual actual state of camera lens module 100 satisfies following condition two in order to make camera lens module 100:
0.5＜BFL/f
2＜1.3 (conditions two)
F wherein
2Be the effective focal length of second lens 120, BFL then is the back focal length length of camera lens module 100.If camera lens module 100 satisfied condition 2 o'clock, then camera lens module 100 can demonstrate preferable performance on the condition of miniaturization.For example, in camera lens module 100, if BFL/f
2＞1.3 o'clock, then the back focal length length of camera lens module 100 just can relatively become greatly, and thus, camera lens module 100 is miniaturization effectively just, and meaning is that the size of camera lens module 100 just can't be dwindled effectively; If BFL/f
2＜0.5 o'clock, it is too small that the back focal length length of camera lens module 100 relatively just can become, and thus, if camera lens module 100 is when being applied to projection arrangement, just easily with projection arrangement in illuminator generation mechanism on interference and collision.In other words, the camera lens module 100 of present embodiment is if can satisfy 0.5＜BFL/f
2＜1.3 o'clock; Then camera lens module 100 just can dwindle its overall dimensions effectively; And preferable quality of optical imaging is provided simultaneously; Meaning promptly is that camera lens module 100 can have smaller volume, and in order to be applied on the optical articles that size dwindles day by day (as: optical articles of minitype projection machine, digital camera and so on).
Supplementary notes a bit when design camera lens module 100, do not limit camera lens module 100 and need satisfy above-mentioned listed condition simultaneously, but the demand of optometry image quality optionally satisfy above-mentioned listed condition.
Following content will be enumerated the embodiment of camera lens module 100.Be noted that; Listed data are not in order to limit the present invention in the below table; Any person of ordinary skill in the field does suitable modification when using principle of the present invention to its parameter or setting, precisely because must belong in the scope of the present invention after with reference to the present invention.
(table)
In table one, radius-of-curvature is meant the radius-of-curvature that each is surperficial, and spacing is meant the distance between two adjacently situated surfaces.For instance, the spacing of surperficial S1, promptly surperficial S1 is to the distance between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number are please with reference to each spacing, refractive index and Abbe number value corresponding in the same column in the remarks column.In addition, in table one, surperficial S1, S2 are two surfaces of first lens 110, and surperficial S3, S4 are two surfaces of second lens 120, and surperficial S5, S6 are two surfaces of the 3rd lens 130, and surperficial S7, S8 are two surfaces of the 4th lens 140.Surface S9 is the surface of the glass cover (cover glass) 70 that is used for light valve 60.
Relevant for parameter values such as each surperficial radius-of-curvature, spacings,, no longer repeat at this please with reference to table one.
In addition, owing to surperficial S1, S2, S3, S4, S5, S6, S8 are aspheric surface, and the formula of aspheric surface is following:
Wherein, Z is the side-play amount of optical axis L direction.R is the radius of osculating sphere (osculating sphere), just near the radius-of-curvature (like the radius-of-curvature of S1, S2, S3, S4, S5, S6, S8 in the form) at optical axis place.K is the constant of the cone (conic constant).H be on the aspheric surface apart from the vertical height of optical axis, be from the lens center height toward rims of the lens, can learn that from formula different h can be corresponding go out different Z values.C4～C10 is asphericity coefficient (asphericcoefficient).The asphericity coefficient of surface S1, S2, S3, S4, S5, S6, S8 and k value are shown in table two:
(table two)
| The surface | K | C4 | C6 | C8 | C10 |
| S1 | 7.1523E+00 | -6.9787E-05 | -5.1286E-07 | -- | -- |
| S2 | -2.5149E+00 | 6.9485E-05 | -4.1731E-06 | -- | -- |
| S3 | -- | -2.0810E-04 | -6.0351E-07 | -- | -- |
| S4 | -3.1863E+00 | -- | -- | -- | -- |
| S5 | 2.7274E+00 | -2.5072E-04 | -3.0430E-06 | -- | -- |
| S6 | -1.8836E+00 | -- | -- | -- | -- |
| S8 | -9.6179E-01 | -8.5515E-05 | -6.5649E-06 | -- | -- |
(table three)
| Project | Numerical value |
| f 2 | 11.306 |
| f 3 | -7.453 |
| f 4 | 7.55 |
| BFL | 10.91 |
| |f 3/(f 4×Nd 3)| | 0.623 |
| BFL/f 2 | 0.965 |
In addition, in table three, list some simulation parameter values of camera lens module 100 respectively, comprise effective focal distance f
2, f
3, f
4, back focal length length BFL, and camera lens module 100 simulation value to condition two that satisfies condition.
Fig. 2 A to Fig. 2 D and Fig. 3 are respectively the image optics emulated data figure of the camera lens module 100 of Fig. 1.In detail, Fig. 2 A is the simulation figure of spherical aberration (spherical aberration), and wherein Fig. 2 A is simulated out with the light of two kinds of different wave lengths (being respectively 436nm, 589nm).Fig. 2 B is the simulation figure of astigmatism, and wherein Fig. 2 B is simulated out with the light of a kind of wavelength (as: 589nm).Fig. 2 C is the simulation figure of distortion, and wherein Fig. 2 C is simulated out with the light of a kind of wavelength (as: 589nm).Fig. 2 D is the simulation figure of lateral chromatic aberration, and Fig. 2 D is simulated out with the light of a kind of wavelength (as: 436nm).In addition, Fig. 3 is the simulation figure of light fan map analysis (ray fan), and wherein Fig. 3 is simulated out with the light of a kind of wavelength (as: 589nm).Because the figure that Fig. 2 A to Fig. 2 D and Fig. 3 are demonstrated is all in the scope of standard; Therefore the camera lens module 100 of present embodiment still can have favorable imaging quality under the framework that adopts four lens 110,120,130,140, and takes into account advantage low-cost and size little (as: miniaturization) simultaneously.
Fig. 4 is the structural representation of the camera lens module of another embodiment of the present invention.With reference to Fig. 4; The camera lens module 200 of present embodiment is similar to camera lens module 100; Both are that first lens 210 in the camera lens module 200 are the meniscus of convex surface (first surface S1) towards the Zoom Side at the difference of one of them; And because first surface S1 adopts the aspheric surface design, though so first surface S1 overall curvature radius be the numerical value of the radius-of-curvature of convex surface, yet the embodiment of first surface S1 concave surface also possible as shown in Figure 4.In the present embodiment; Second lens 220 can be the biconvex lens of convex surface towards Zoom Side and reduced side; Have positive diopter simultaneously, the 3rd lens 230 can be the biconcave lens of concave surface towards Zoom Side and reduced side, have negative diopter simultaneously; And the 4th lens 240 can be the biconvex lens of convex surface towards Zoom Side and reduced side, and are as shown in Figure 4.
Similarly, because the structural similarity of camera lens module 200 and camera lens module 100, both one of them difference is that the first lens group LG1 adopts the first dissimilar lens 210, and LG3 uses the different refractivity material.Therefore camera lens module 200 has the mentioned advantage of camera lens module 100 equally.In other words, if camera lens module 200 meet aforesaid condition () to (two) at least one of them the time, its overall dimensions and optical quality thereof also can obtain good performance.
Following content will be enumerated the embodiment of camera lens module 200.Be noted that; Listed data are not in order to limit the present invention in the below table four; Those skilled in the art do suitable modification when using principle of the present invention to its parameter or setting, precisely because must belong in the scope of the present invention under any after with reference to the present invention.
(table four)
In table four, radius-of-curvature is meant the radius-of-curvature that each is surperficial, and spacing is meant the distance between two adjacently situated surfaces.For instance, the spacing of surperficial S1, promptly surperficial S1 is to the distance between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number are please with reference to each spacing, refractive index and Abbe number value corresponding in the same column in the remarks column.In addition, in table four, surperficial S1, S2 are two surfaces of first lens 110, and surperficial S3, S4 are two surfaces of second lens 120, and surperficial S5, S6 are two surfaces of the 3rd lens 130, and surperficial S7, S8 are two surfaces of the 4th lens 140.Surface S9 is the surface of the glass cover (cover glass) 70 that is used for light valve 60.
Relevant for parameter values such as each surperficial radius-of-curvature, spacings,, no longer repeat at this please with reference to table one.
In addition, owing to surperficial S1, S2, S3, S4, S5, S6, S7, S8 are aspheric surface, and the formula of aspheric surface is following:
Wherein, Z is the side-play amount of optical axis L direction.R is the radius of osculating sphere, just near the radius-of-curvature (like the radius-of-curvature of S1～S8 in the form) at optical axis place.K is the constant of the cone.H be on the aspheric surface apart from the vertical height of optical axis, be from the lens center height toward rims of the lens, can learn that from formula different h can be corresponding go out different Z values.C4～C10 is an asphericity coefficient.The asphericity coefficient of surface S1～S8 and k value are shown in table five:
(table five)
(table six)
| Project | Numerical value |
| f 2 | 17.237 |
| f 3 | -9.226 |
| f 4 | 7.971 |
| BFL | 16.65 |
| |f 3/(f 4×Nd 3)| | 0.72 |
| BFL?/f 2 | 0.953 |
In addition, in table six, list some simulation parameter values of camera lens module 200 respectively, comprise effective focal distance f
2, f
3, f
4, back focal length length BFL, and camera lens module 200 satisfies the simulation value of aforementioned condition one to condition two.
Fig. 5 A to Fig. 5 D and Fig. 6 are respectively the image optics emulated data figure of the camera lens module 200 of Fig. 4.In detail, Fig. 5 A is the simulation figure of spherical aberration, and wherein Fig. 5 A is simulated out with the light of two kinds of different wave lengths (being respectively 436nm, 589nm).Fig. 5 B is the simulation figure of astigmatism, and wherein Fig. 5 B is simulated out with the light of a kind of wavelength (as: 589nm).Fig. 5 C is the simulation figure of distortion, and wherein Fig. 5 C is simulated out with the light of a kind of wavelength (as: 589nm).Fig. 5 D is the simulation figure of lateral chromatic aberration, and Fig. 5 D is simulated out with the light of a kind of wavelength (as: 436nm).In addition, Fig. 6 is the simulation figure of light fan map analysis, and wherein Fig. 6 is simulated out with the light of a kind of wavelength (as: 589nm).Because the figure that Fig. 5 A to Fig. 5 D and Fig. 6 are demonstrated is all in the scope of standard; Therefore the camera lens module 200 of present embodiment still can have favorable imaging quality under the framework that adopts four lens 210,120,130,140, and takes into account advantage low-cost and size little (as: miniaturization) simultaneously.
In sum, embodiments of the invention can reach following effect at least one of them.At first, camera lens module satisfy 0.45＜| f
3/ (f
4* Nd
3) | under＜1.2 the condition, use four lens and demonstrate preferable quality of optical imaging, as: camera lens module issuable aberration when the imaging improved.In addition, because camera lens module uses four lens just can demonstrate preferable quality of optical imaging, therefore just can have advantage low-cost and size little (as: miniaturization) simultaneously.
The above person is merely the preferred embodiments of the present invention, and can not limit the scope of the present invention's enforcement with this, and promptly all simple equivalent of doing according to claim of the present invention and invention description change and revise, and all still belong in the scope of patent covering of the present invention.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary and denomination of invention only are used for auxiliary patent document retrieval, are not to be used for limiting interest field of the present invention.
Claims (13)
1. a camera lens module is made up of four lens, and said camera lens module comprises:
First lens group comprises:
First lens have negative diopter, and have towards the first surface of Zoom Side and second surface towards reduced side, said first surface and said second surface one of them is that non-ball is surperficial at least; And
Second lens group; Be disposed between said first lens and the said reduced side; And said second lens group comprises second lens, the 3rd lens and the 4th lens that are arranged in order to said reduced side from said Zoom Side; That the diopter of said second lens, said the 3rd lens and said the 4th lens is followed successively by is positive and negative, just, and said second lens, said the 3rd lens and said the 4th lens at least wherein two respectively comprise non-ball surface;
Wherein, the effective focal length of said the 3rd lens is f
3And refractive index is Nd
3, the effective focal length of said the 4th lens is f
4, and said camera lens module meets formula:
0.45＜|f
3/(f
4×Nd
3)|＜1.2。
2. camera lens module according to claim 1, the effective focal length of wherein said second lens are f
2, the back focal length length of said camera lens module is BFL, and said camera lens module meets 0.5＜BFL/f
2＜1.3.
3. camera lens module according to claim 1 also comprises aperture diaphragm, is disposed between said second lens and said the 3rd lens.
4. camera lens module according to claim 1, wherein said first surface and said second surface one of them is a concave surface at least.
5. camera lens module according to claim 4, wherein said first lens are crescent lens or biconcave lens.
6. camera lens module according to claim 1, wherein said second lens, said the 3rd lens and said the 4th lens at least wherein two respectively be non-spherical lens.
7. camera lens module according to claim 1, wherein said second lens comprise biconvex lens.
8. camera lens module according to claim 1, wherein said the 3rd lens comprise biconcave lens.
9. camera lens module according to claim 1, wherein said the 4th lens comprise biconvex lens.
10. camera lens module according to claim 1, the material of wherein said first lens, said second lens, said the 3rd lens and said the 4th lens comprises glass or plastics.
11. camera lens module according to claim 1, wherein said first lens group are focusing crowd in order to move with respect to said camera lens module, said second lens group is in order to fixed and be group of stability with respect to said camera lens module.
12. camera lens module according to claim 1; Wherein said first lens group and said second lens group be in order to moving with respect to said camera lens module simultaneously and to be the focusing crowd, and said first lens group when moving with respect to said camera lens module with said second lens group while in order to change the back focal length length of said camera lens module.
13. camera lens module according to claim 1, the refractive index Nd of wherein said the 3rd lens
3Be the refractive index of said the 3rd lens under the green-yellow light wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106004794A CN102566014A (en) | 2010-12-17 | 2010-12-17 | Lens module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106004794A CN102566014A (en) | 2010-12-17 | 2010-12-17 | Lens module |
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|---|---|
| CN102566014A true CN102566014A (en) | 2012-07-11 |
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ID=46411843
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|---|---|---|---|
| CN2010106004794A Pending CN102566014A (en) | 2010-12-17 | 2010-12-17 | Lens module |
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| CN105765339A (en) * | 2013-11-29 | 2016-07-13 | 克劳迪奥·塞达扎里 | Telecentric lens |
| CN107831630A (en) * | 2017-12-15 | 2018-03-23 | 浙江舜宇光学有限公司 | Projection lens |
| CN108885330A (en) * | 2016-04-01 | 2018-11-23 | 柯尼卡美能达株式会社 | Imaging lens system, lens unit and photographic device |
| CN108897123A (en) * | 2018-09-21 | 2018-11-27 | 协益电子（苏州）有限公司 | Optical lens and automobile data recorder |
| CN109298584A (en) * | 2018-12-04 | 2019-02-01 | 深圳市大象投影显示技术有限责任公司 | Projection lens and projector |
| WO2019114232A1 (en) * | 2017-12-15 | 2019-06-20 | 浙江舜宇光学有限公司 | Projection lens |
| CN109932800A (en) * | 2017-12-18 | 2019-06-25 | 上旸光学股份有限公司 | Zoom lens |
| CN110262016A (en) * | 2019-07-30 | 2019-09-20 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN110873945A (en) * | 2018-08-31 | 2020-03-10 | 声远精密光学股份有限公司 | Wide-angle imaging lens |
| US11966012B2 (en) | 2020-07-28 | 2024-04-23 | Coretronic Corporation | Projection lens including four lenses of −+−+ refractive powers |
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| CN101082695A (en) * | 2006-05-31 | 2007-12-05 | 富士能株式会社 | Wide-angle imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105765339B (en) * | 2013-11-29 | 2018-09-25 | 奥普图工程股份有限公司 | Telecentric lens |
| CN105765339A (en) * | 2013-11-29 | 2016-07-13 | 克劳迪奥·塞达扎里 | Telecentric lens |
| CN108885330A (en) * | 2016-04-01 | 2018-11-23 | 柯尼卡美能达株式会社 | Imaging lens system, lens unit and photographic device |
| CN108885330B (en) * | 2016-04-01 | 2020-11-24 | 柯尼卡美能达株式会社 | Imaging lens, lens unit, and imaging device |
| CN107831630A (en) * | 2017-12-15 | 2018-03-23 | 浙江舜宇光学有限公司 | Projection lens |
| CN107831630B (en) * | 2017-12-15 | 2023-12-29 | 浙江舜宇光学有限公司 | Projection lens |
| WO2019114232A1 (en) * | 2017-12-15 | 2019-06-20 | 浙江舜宇光学有限公司 | Projection lens |
| CN109932800A (en) * | 2017-12-18 | 2019-06-25 | 上旸光学股份有限公司 | Zoom lens |
| CN109932800B (en) * | 2017-12-18 | 2022-03-25 | 上旸光学股份有限公司 | Zoom lens |
| CN110873945B (en) * | 2018-08-31 | 2021-10-08 | 声远精密光学股份有限公司 | Wide-angle imaging lens |
| CN110873945A (en) * | 2018-08-31 | 2020-03-10 | 声远精密光学股份有限公司 | Wide-angle imaging lens |
| CN108897123A (en) * | 2018-09-21 | 2018-11-27 | 协益电子（苏州）有限公司 | Optical lens and automobile data recorder |
| CN109298584A (en) * | 2018-12-04 | 2019-02-01 | 深圳市大象投影显示技术有限责任公司 | Projection lens and projector |
| CN110262016A (en) * | 2019-07-30 | 2019-09-20 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN110262016B (en) * | 2019-07-30 | 2024-05-28 | 浙江舜宇光学有限公司 | Optical imaging system |
| US11966012B2 (en) | 2020-07-28 | 2024-04-23 | Coretronic Corporation | Projection lens including four lenses of −+−+ refractive powers |
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