CN201322821Y - Small-sized image-pickup lens with four lens pieces, camera module and image-pickup device - Google Patents
Small-sized image-pickup lens with four lens pieces, camera module and image-pickup device Download PDFInfo
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- CN201322821Y CN201322821Y CNU2008201371418U CN200820137141U CN201322821Y CN 201322821 Y CN201322821 Y CN 201322821Y CN U2008201371418 U CNU2008201371418 U CN U2008201371418U CN 200820137141 U CN200820137141 U CN 200820137141U CN 201322821 Y CN201322821 Y CN 201322821Y
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Abstract
The utility model provides a small-sized image-pickup lens with four lens pieces, a camera module and an image-pickup device. The image-pickup lens utilizes a good lens system with non-spherical surface can be shortened in full length, maintain good imaging performance and realize manufacturability; the image-pickup lens is provided with a positive first lens piece (L1), a negative second lens piece (L2), a third lens piece (L3) and a fourth lens piece (L4), wherein, the surface of the object side of the first lens piece (L1) is designed as a convex near an optical axis; the surface of the image side of the second lens piece (L2) is designed as a concave near the optical axis; the third lens piece (L3) has negative focal power near the optical axis; the two sides of the fourth lens piece (L4) are non spherical, and the surface of the image side of the fourth lens piece near the optical axis is designed as a convex while that at the peripheral parts are designed as concave surfaces; and the lens pieces meet the following conditional expressions (f1 represents the overall focus, f3 represents the focus of the third lens piece (L3), D4 represents the distance between the second lens piece (L2) and the third lens piece (L3) on the optical axis, DM3 represents the maximal lens thickness of the third lens piece (L3), and D5 represents the center thickness of the third lens piece (L3) ): 1. f/f3 is larger than or equal to minus 1.5 and less than or equal to minus 0.005; 2. D4/f is larger than or equal to 0.07 and less than or equal to 0.3; and 3. DM3/D5 is larger than or equal to 1.0 and less than or equal to 1.5.
Description
Technical field
The utility model relates to a kind of, 4 chip architecture small-sized image pickup lens of the optical image of imaging subject and will convert the camera module of image pickup signal to by the optical image that these 4 chip architecture small-sized image pickup lens form and load digital stillcamera that these 4 chip architecture small-sized image pickup lens photograph or the mobile phone and the personal digital assistant camera heads such as (PDA:PersonalDigital Assistance) of band camera on CCD (Charge Coupled Device) or CMOS imaging apparatuss such as (Complementary Metal Oxide Semiconductor).
Background technology
In recent years, along with PC the popularizing of general family etc., the digital static camera that image informations such as the landscape of photography or bust can be input to PC is being popularized rapidly.And the Load Images input is also more and more with the phenomenon of camera module on mobile phone.Have imaging apparatuss such as use CCD or CMOS on the equipment of this camera function.In addition, these several years, the densification of those imaging apparatuss improved, and imaging lens system whole to picture pick-up device and that be loaded into it also requires compactedness.Simultaneously, the high pixelation of imaging apparatus is also being improved, and requiring high-resolution, the high performance of imaging lens system.
To this requirement, for example can consider, in order to seek densification (shorteningization of optical axis direction) and cheap, high-resolutionization, the lens number is made as 4 chip architectures, in order to seek high performance, actively use aspheric scheme.Disclose promising this 4 chip architectures and use aspheric imaging lens system at patent documentation 1 to 4.
[patent documentation 1] patent disclosure 2004-302057 communique
[patent documentation 2] patent disclosure 2007-17984 communique
[patent documentation 3] patent disclosure 2002-228922 communique
The 6th, 917, No. 479 instructionss of [patent documentation 4] United States Patent (USP)
In above-mentioned picture pick-up device, require the limit consider to produce in batches and the deterioration of optical property is restricted to irreducible minimum, the limit attenuates the length of the optical axis direction of camera module integral body (=highly).Yet, if with the lens back focal length (from lens as the position of side distance to image planes) merely be made as too small, generally be difficult to satisfy light the ejaculation angle specification or in apparent specifications such as the cut of final lens face, foreign matters.And, if merely be made as the thickness DL of lens combination (DL: lens through thickness=to as the distance on the summit of side lens face) too small from the summit of the lens face of object side, then be necessary to be made as the center thickness D of each lens key element too small, or make aspheric effect strong excessively, produce by lens shape take place when the moulding innerly to distort, axle offset is toppled over, by the deterioration of the manufacturing of Dimensions requirement.Need thus, under the situation of carrying out the total length shorteningization, the thickness DL of lens back focal length, lens combination, the center thickness of each lens key element etc. are established little, and assemble these under proper condition evenly, when producing in batches, keep the good optical performance.
Above-mentioned patent documentation 1 described imaging lens system is because diaphragm at the rear side of the 2nd lens, therefore, if carry out the total length cripeturaization, then exists the ejaculation angle of light to become big problem easily.In addition, disclose the imaging lens system of 4 chip architectures of various kinds at patent documentation 2, but be fit closely design to each configuration example hardly.For example, about the embodiment (value of representing 4 front and back) of the little type of focal length, for the ratio of the total length of focal length greater than 1.25.The lens of embodiment beyond it are big, can think not fully take into account manufacturing to the center thickness of miniaturization etc.In addition, at the imaging lens system shown in patent documentation 3 and the patent documentation 4 because the focal length of embodiment, total length, and lens thickness all big, therefore, can think not fully take into account manufacturing to the center thickness of the miniaturization of imaging apparatus in recent years etc.
The utility model content
The utility model is referred from this problem points and proposes, its purpose is, a kind of high imaging performance of keeping when using the cripeturaization that aspheric surface keeps total length is provided, and, can realize the good lens combination of manufacturing 4 chip architecture small-sized image pickup lens, and load camera module and the camera head that its 4 chip architecture small-sized image pickup lens can obtain the image pickup signal of high-resolution.
4 chip architecture small-sized image pickup lens of the present utility model, the face that possesses object side is set as the 1st lens of the positive focal power of having of convex surface near optical axis; Near optical axis, be set as the 2nd lens of the negative focal power of having of concave surface as the face of side; Near optical axis, have the 3rd lens of negative focal power; When the two sides is aspherical shape, near optical axis, is set as concave shape, is set as the 4th lens of convex form as the face of side, and constitute the formula of meeting the following conditions at periphery:
-1.5≤f/f3≤-0.005……(1)
0.07≤D4/f≤0.3……(2)
1.0≤DM3/D5≤1.5……(3)
In the formula,
F: whole focal length
F3: the focal length of the 3rd lens
D4: the 2nd lens on the optical axis and the interval between the 3rd lens
DM3: the lens thickness of the maximum in the scope of the effective diameter of the object side of the 3rd lens
D5: the center thickness of the 3rd lens.
In 4 chip architecture small-sized image pickup lens of the present utility model, be during 4 lens constitute as a whole, effective optimization of using aspheric surface to seek each lens shape, and, satisfy the defined terms formula and seek the optimization that lens constitute, thereby, both consider manufacturing, and in the cripeturaization that can obtain total length, can obtain high imaging performance.
And, further adopting and satisfied following desirable formation by suitable selection, the consideration manufacturing also can help the cripeturaization or the imaging performance of total length more.
In 4 chip architecture small-sized image pickup lens of the present utility model, preferably suitably optionally meet the following conditions:
v3≤40……(4)
In the formula,
V3: the Abbe number of the 3rd lens.
At 4 chip architecture small-sized image pickup lens of the present utility model, on optical axis, diaphragm disposed than the outer fringe position of the object side of the 1st lens more by object side.
In this situation, preferred the 3rd lens when the face of object side is concave shape, are convex form as the face of side near optical axis, and the 4th lens when the face of object side is convex form, are concave shape as the face of side near optical axis.
4 chip architecture small-sized image pickup lens of the present utility model can also more dispose diaphragm by the picture side than the 1st lens.Need to prove, this is said " than the 1st lens more by the picture side " be meant, on optical axis, than the outer fringe position of the face of the outer fringe position of the face of the object side of the 1st lens or picture side more by looking like the position of side.
In this situation, preferred the 3rd lens are near optical axis, and the face of object side is a concave shape, and the 4th lens when the face of object side is convex form, are concave shape as the face of side near optical axis.
Possess according to camera module of the present utility model: the imaging apparatus of the image pickup signal of the optical image that 4 chip architecture small-sized image pickup lens of the present utility model and output form according to 4 chip architecture small-sized image pickup lens thus.
In according to camera module of the present utility model, can obtain the image pickup signal of high-resolution according to the optical image of the high-resolution by 4 chip architecture small-sized image pickup lens of the present utility model.And, since according to the total length of 4 chip architecture small-sized image pickup lens of the present utility model by cripeturaization, so, as seeking miniaturization with the camera module integral body of 4 chip architecture small-sized image pickup combination of lensess.
Possess according to camera module of the present utility model according to camera head of the present utility model.
In according to camera head of the present utility model, can obtain the image pickup signal of high-resolution according to the optical image of the high-resolution that obtains by camera module of the present utility model, can obtain the photographs of high-resolution according to its image pickup signal.
According to 4 chip architecture small-sized image pickup lens of the present utility model, in integral body is during 4 lens constitute, use aspheric surface to seek the optimization of each lens shape effectively, and, satisfy defined terms and seek the optimization that lens constitute, so, keep high imaging performance in the time of the total length cripeturaization, and can realize making suitable good lens combination.
In addition, according to camera module of the present utility model, output has the image pickup signal of the optical image that the 4 chip architecture small-sized image pickup lens above-mentioned of the present utility model of high imaging performance form according to by the total length cripeturaization time, so, can obtain the image pickup signal of high-resolution when seeking the miniaturization as module integral body.
In addition, according to camera head of the present utility model, because of having loaded above-mentioned camera module of the present utility model, so, when seeking the miniaturization of camera part, obtain the image pickup signal of high-resolution, can obtain the photographs of high-resolution according to its image pickup signal.
Description of drawings
Fig. 1 is the 1st configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 1.
Fig. 2 is the 2nd configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 2.
Fig. 3 is the 3rd configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 3.
Fig. 4 is the 4th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 4.
Fig. 5 is the 5th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 5.
Fig. 6 is the 6th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 6.
Fig. 7 is the 7th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 7.
Fig. 8 is the 8th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 8.
Fig. 9 is the 9th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 9.
Figure 10 is the 10th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 10.
Figure 11 is the 11st configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 11.
Figure 12 is the 12nd configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 12.
Figure 13 is the 13rd configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 13.
Figure 14 is the 14th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 14.
Figure 15 is the 15th configuration example of 4 related chip architecture small-sized image pickup lens of an expression embodiment of the present utility model, is the lens profile figure corresponding to embodiment 15.
Figure 16 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 1.
Figure 17 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 2.
Figure 18 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 3.
Figure 19 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 4.
Figure 20 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 5.
Figure 21 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 6.
Figure 22 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 7.
Figure 23 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 8.
Figure 24 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 9.
Figure 25 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 10.
Figure 26 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 11.
Figure 27 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 12.
Figure 28 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 13.
Figure 29 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 14.
Figure 30 is the figure of the basic lens data of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 15.
Figure 31 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 1.
Figure 32 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 2.
Figure 33 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 3.
Figure 34 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 4.
Figure 35 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 5.
Figure 36 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 6.
Figure 37 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 7.
Figure 38 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 8.
Figure 39 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 9.
Figure 40 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 10.
Figure 41 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 11.
Figure 42 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 12.
Figure 43 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 13.
Figure 44 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 14.
Figure 45 is expression about the figure of the aspheric data of 4 related chip architecture small-sized image pickup lens of embodiment of the present utility model 15.
Figure 46 sums up the figure of expression about the value of conditional to each embodiment.
Figure 47 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 1, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 48 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 2, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 49 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 3, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 50 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 4, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 51 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 5, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 52 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 6, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 53 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 7, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 54 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 8, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 55 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 9, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 56 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 10, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 57 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 11, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 58 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 12, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 59 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 13, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 60 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 14, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 61 is the aberration diagram of all aberrations of 4 related chip architecture small-sized image pickup lens of expression embodiment of the present utility model 15, and (A) expression spherical aberration, (B) represent astigmatic aberration, (C) expression distortion aberration, (D) expression multiplying power chromatic aberation.
Figure 62 is the stereographic map of a configuration example of the related camera module of an expression embodiment of the present utility model.
Figure 63 is the stereographic map of a configuration example of the related camera head of an expression embodiment of the present utility model.
Among the figure: L1-the 1st lens, L2-the 2nd lens, L3-the 3rd lens, L4-the 4th lens, St-aperture diaphragm, Ri-are from the radius-of-curvature of i lens face of object side, and Di-is from object side i the face interval with i+1 lens face, Z1-optical axis.
Embodiment
Below, describe embodiment of the present utility model in detail with reference to accompanying drawing.
Fig. 1 represents the 1st configuration example of the 4 chip architecture small-sized image pickup lens (following is called " imaging lens system ") that an embodiment of the present utility model is related.(Figure 16, lens Figure 31) constitute this configuration example corresponding to the described later the 1st numerical value embodiment.Equally, will (section of the 2nd to the 15th configuration example that the lens of Figure 17～Figure 30 and Figure 32～Figure 45) constitute constitutes and is shown in Fig. 2～Figure 15 corresponding to the described later the 2nd to the 15th numerical value embodiment.In Fig. 1～Figure 15, symbol Ri represents that the face with the lens key element of object side is the 1st, the radius-of-curvature of enclosing i face of symbol along with the mode that increases successively towards picture side (imaging side).Symbol Di represent on the optical axis Z1 of i face and i+1 face face at interval.In addition, because the basic comprising of each configuration example is all identical, therefore, as describing substantially, the configuration example to Fig. 2～Figure 15 also describes as required in following configuration example with imaging lens system shown in Figure 1.
The related imaging lens system of present embodiment is applicable to the various picture pick-up devices of imaging apparatuss such as using CCD or CMOS, especially more small-sized portable terminal, for example, the mobile phone of digital stillcamera, band camera, and PDA etc.This imaging lens system, Z1 possesses successively from object side along optical axis: the 1st lens L1, the 2nd lens L2, the 3rd lens L3, the 4th lens L4.At imaging apparatuss (not shown) such as imaging surface (shooting face) Simg of this imaging lens system configuration CCD.The also configurable cloche that is used to protect shooting face between the 4th lens L4 and imaging surface (shooting face) Simg, infrared ray cut is considered optics CG such as mating plate or low-pass filter.
This imaging lens system also has diaphragm St.Diaphragm St is optical aperture diaphragm, and preferred disposition is in so-called " the front side diaphragm " that lean on most object side.Herein, " by object side " mean on optical axis than the outer fringe position E of the face of the object side of the 1st lens L1 more by object side (with reference to Fig. 1), for example, also mean to be included on the optical axis, be disposed at the situation between the outer fringe position E of face of the vertex of surface position of the object side among the 1st lens L1 and the object side among the 1st lens L1.
But, also can be with diaphragm St be configured in than the 1st lens L1 more by the picture side so-called " middle diaphragm ".For example, and the configuration example as the 12nd～14 (Figure 12～Figure 14), also configurable between the 1st lens L1 and the 2nd lens L2.Be meant at this said " between the 1st lens L1 and the 2nd lens L2 ", on optical axis, between the outer fringe position of the outer fringe position of the face of the outer fringe position of the face of the object side of the 1st lens L1 or picture side and the face of the 2nd lens L2 object side.Certainly, also mean to be included on the optical axis near the situation of the configuration diaphragm St situation of the configuration diaphragm St vertex of surface position of the picture side of the 1st lens L1 near and vertex of surface position at the object side of the 2nd lens L2.
This imaging lens system, the two sides of the 4th lens L4 is set as aspherical shape.For the 1st lens L1, the 2nd lens L2, and the 3rd lens L3, also preferably contain aspheric surface respectively at least 1 bread.
The 1st lens L1 has positive focal power.The 1st lens L1, the face of object side is made as convex surface near optical axis.The 1st lens L1, preferably the face as side is made as convex form near optical axis, is two convex forms near optical axis.But, the configuration example as the 11st～13 (near Figure 11～Figure 13), also can optical axis, will be made as concave shape as the face of side, near optical axis with the positive meniscus shaped lens of convex surface towards object side.
The 2nd lens L2 has negative focal power.The 2nd lens L2 is made as concave surface as the face of side near optical axis.The 2nd lens L2, the face of preferred object side is made as convex form near optical axis, be with the negative meniscus shaped lens of convex surface towards object side near optical axis.
The 3rd lens L3 has negative focal power near optical axis.The 3rd lens L3 preferably is meniscus shape near optical axis.But the configuration example as the 12nd (Figure 12) also can be two concave shapes.In the 1st configuration example (Fig. 1), the 3rd lens L3 is set as near optical axis, when the face of object side is convex surface, is the meniscus shape of concave surface as the face of side.(among Fig. 2～Figure 11 and Figure 13～Figure 15), the 3rd lens L3 near optical axis, when the face that is set as object side is concave surface, is the meniscus shape of convex surface as the face of side to configuration example the the the 2nd～the 11st and the 13rd～the 15th.
The 4th lens L4 is made as near optical axis towards being concave shape as side as the face of side, and at periphery towards the aspheric surface that becomes convex form as side.The 4th lens L4, for example, the face that is set as the preferred object side in the convex surface, is the meniscus shape of concave surface as the face of side near optical axis.In the 1st configuration example of Fig. 1, the 4th lens L4 is made as two concave shapes, but is made as meniscus shape in other configuration examples.
The 4th lens L4 preferably according to the formation of other lenses key element, suitably selects the focal power of plus or minus near optical axis.For example, at this imaging lens system, when the stop position is middle diaphragm,, then help the shorteningization of total length if the paraxial focal power of the 4th lens L4 just is made as.In addition, if the paraxial focal power of the 4th lens L4 just is being made as, the shape of the 1st lens L1 is being made as meniscus shape, when then helping the shorteningization of total length, easily revisal spherical aberration or curvature of the image.
This imaging lens system, the formula that meets the following conditions (1)～(3):
-1.5≤f/f3≤-0.005……(1)
0.07≤D4/f≤0.3……(2)
1.0≤DM3/D5≤1.5……(3)
In the formula,
F: whole focal length
F3: the focal length of the 3rd lens L3
D4: the 2nd lens L2 on the optical axis and the interval between the 3rd lens L3
DM3: the lens thickness of the maximum in the scope of the effective diameter of the object side of the 3rd lens L3
D5: the center thickness of the 3rd lens L3.
Need to prove that more specifically, DM3 is meant the thickness of the maximum lens that are parallel to optical axis Z1 direction.The effective diameter of lens front is during less than the back, is in the scope of effective diameter of lens front from the scope of the distance (highly) of the optical axis Z1 that calculates maximum lens thickness.
And formula preferably suitably optionally meets the following conditions:
v3≤40……(4)
In the formula,
V3: the Abbe number of the 3rd lens L3.
And formula preferably optionally meets the following conditions:
1.0≤|R7/R8|≤3.0……(5)
1.3≤f/f1≤1.8……(6)
v1≥70……(7)
0.1≤D5/f≤0.15……(8)
In the formula,
R7: the paraxial radius-of-curvature of the face of the object side of the 4th lens L4
R8: the paraxial radius-of-curvature of the face of the picture side of the 4th lens L4
F: whole focal length
F1: the focal length of the 1st lens L1
V1: the Abbe number of the 1st lens L1
D5: the center thickness of the 3rd lens L3.
Figure 62 is a configuration example of the camera module of the related imaging lens system of expression assembling present embodiment.Figure 63 (A), (B) are as the mobile phone of an example expression band camera of the camera head of the camera module that loads Figure 62.
Mobile phone at the band camera shown in Figure 63 (A), (B) possesses top basket 2A and bottom basket 2B, and both constitute freely towards the direction of arrow rotation of Figure 63 (A).Basket 2B is provided with operating key 21 etc. in the bottom.Be provided with camera section 1 (Figure 63 (B)) and display part 22 (Figure 63 (A)) etc. at top basket 2A.Display part 22 is by display panels such as LCD (liquid crystal panel) or EL (Electro-Luminescence) panels and constitute.Display part 22 is disposed at a side that becomes inner face when folding.At this display part 22, except the various menus that show relevant telephony feature, also can show the image of being photographed etc. by camera section 1.Camera section 1 for example is disposed at the inner face side of top basket 2A.But the position that camera section 1 is set is not limited thereto.
In the camera module shown in Figure 62, the optical image that is formed by imaging lens system 20 converts electrical image pickup signal to by imaging apparatus, and this image pickup signal is output to the signal processing circuit of camera head main body side by flexible substrate 5 and external connection terminals 6., in this camera module, using the related imaging lens system of present embodiment herein as imaging lens system 20, so, can obtain by the image pickup signal of the high-resolution of abundant revisal aberration.At the camera head main body side, can generate the high-resolution image according to its image pickup signal.
In addition, the camera head that present embodiment is related is not limited to the mobile phone with camera, for example is that digital static camera or PDA etc. also can.
Then, be described in more detail as the effect of the imaging lens system of above formation and effect, especially about the effect and the effect of conditional.
In the related imaging lens system of present embodiment, in integral body is during 4 lens constitute, the optimization of using aspheric surface efficiently and seeking each lens shape, and satisfy the defined terms formula and seek the optimization that lens constitute, so, both take into full account manufacturing so that cost does not uprise, and can in the cripeturaization of total length, obtain high imaging performance again.
About aspherical shape, especially make the 4th lens L4 be varied to different shapes at central part and periphery, and from the image planes central part to periphery revisal curvature of the image well.In the 4th lens L4, with the 1st lens L1, the 2nd lens L2, and the 3rd lens L3 compare, light beam is separated at every visual angle.Therefore, the 4th lens L4 by making the final lens face that is bordering on imaging apparatus most as the side near optical axis towards become concave shape as side, and at periphery towards become convex form as side, the suitable aberration at the every visual angle of revisal, light beam is controlled as below the certain angle to the incident angle of imaging apparatus.Thereby, when can alleviate the distribution of the region-wide light of imaging surface, help the revisal of curvature of the image or distortion aberration etc.
Usually, in camera-lens system, telecentric iris promptly to the incident angle of the chief ray of imaging apparatus preferably to optical axis near parallel (at the incident angle of shooting face to the normal of shooting face near zero).In order to ensure this telecentric iris, diaphragm St preferably is disposed at object side as far as possible.On the other hand, if diaphragm St is disposed at lens face from the object side of the 1st lens L1 further on the position that the object side direction is left, its part (distance of the lens face of diaphragm St and object side) is added as optical path length, and is therefore, unfavorable aspect the densification that constitutes in integral body.Thereby, by on optical axis Z1, diaphragm St being disposed at the identical position of vertex position with the object side lens face of the 1st lens L1, or be disposed at the 1st lens L1 object side the vertex of surface position and the picture vertex of surface position of side between, can seek the cripeturaization of total length, and can guarantee telecentric iris.When paying attention to the guaranteeing of telecentric iris more, between the outer fringe position E (with reference to Fig. 1) of the face of the object side of the vertex of surface position of the object side that on the optical axis diaphragm St is disposed at the 1st lens L1 and the 1st lens L1, get final product.
Below, the concrete meaning of each conditional is described.
Conditional (1) relates to the focal distance f 3 of the 3rd lens L3.In this imaging lens system, the 3rd lens L3 has negative focal power near optical axis, but by the formula (1) that satisfies condition about the 3rd lens L3, in the lens combination of 4 chip architectures, can reach high-resolution when integral body is densification.In addition, in this imaging lens system, when the 3rd lens L3 and the 4th lens L4 are made as aspherical shape, successfully change at central part and periphery by making its aspherical shape, the transfer printing performance of the aspherical shape in the time of can making moulding is for good.By the formula of satisfying condition (1), can be made as the formation favourable to moulding.If surpass the lower limit of conditional (1), then the negative focal power of the 3rd lens L3 became strong, and mainly can not keep curvature of the image well and distort aberration.If surpass the upper limit, then the negative focal power of the 3rd lens L3 becomes too small, when the 3rd lens L3 is made as aspherical shape, becomes big at the central part of aspherical shape and the difference of periphery optical axis direction, and is unfavorable for moulding.
Conditional (2) relates to the interval D 4 on the optical axis of the 2nd lens L2 and the 3rd lens L3.If surpass the lower limit of conditional (2), the ejaculation angle that then makes light easily is abreast near optical axis Z1, and is difficult for designing the imaging lens system that can suitably control the incident angle of imaging apparatus face.If surpass its upper limit, then can not suitably keep spherical aberration and coma aberration, therefore, be difficult to make it bright.
In order to obtain better performance, the numerical range of conditional (2) is preferred:
0.2≤D4/f≤0.25……(2′)
Conditional (3) relates to the shape of the 3rd lens L3.By the formula of satisfying condition (3), when the 3rd lens L3 is made as aspherical shape, its aspherical shape is successfully changed at central part and periphery, the transfer printing performance of the aspherical shape in the time of can making moulding is for good.
In order to obtain better performance, the numerical range of conditional (3) is preferred:
1.0≤DM3/D5≤1.4……(3′)
More preferably:
1.0≤DM3/D5≤1.3……(3″)
Conditional (4) relates to the material of the 3rd lens L3, stipulates the value of suitable Abbe number.By the formula of satisfying condition (4), chromatic aberation and multiplying power chromatic aberation on the retainer shaft well easily.If surpass the upper limit of conditional (4), then especially become too minus side about the chromatic aberation short wavelength side of periphery, the multiplying power chromatic aberation worsens, and the resolution of periphery can worsen.
Conditional (5) relates to the paraxial shape of the 4th lens L4.By the formula of satisfying condition (5), can keep curvature of the image well.If surpass the lower limit of conditional (5), then meridianal image surface becomes minus side, and distorting aberration has the tendency that becomes the pillow type.If surpass the upper limit, then for meridianal image surface, sagittal image surface becomes minus side too partially.
In order to obtain better performance, the numerical range of conditional (5) is preferred:
1.0≤|R7/R8|≤1.2……(5′)
Conditional (6) relates to the focal distance f 1 of the 1st lens L1.By the formula of satisfying condition (6), mainly can keep the relation between total length and the spherical aberration well.If surpass the lower limit of conditional (6), then there is the focal power of the 1st lens L1 to become strong, spherical aberration becomes the too tendency of minus side.And the ejaculation angle of light becomes big tendency easily.If surpass the upper limit, the elongated tendency of total length then arranged.
Conditional (7) relates to the material of the 1st lens L1, stipulates the value of suitable Abbe number.If surpass the lower limit of conditional (7), then because of the chromatic aberation on the axle becomes big, so not preferred.
Conditional (8) relates to the center thickness D5 of the 3rd lens L3.Especially under the condition of above-mentioned conditional (4), (5), (7), if surpass the upper limit of conditional (8), then distorting becomes barrel shape, and in addition, curvature of the image becomes positive side.And, become minus side about the chromatic aberation short wavelength side of multiplying power, be difficult to remain on well the aberration balancing of peripheral image height.If surpass lower limit, the thickness integral thinned of the 3rd lens L3, be subject to process or moulding on restriction.
Imaging lens system as described above, related according to present embodiment is kept high imaging performance when can realize the total length cripeturaization, and makes suitable good lens combination.And, the camera module related according to present embodiment, because of making it to export the image pickup signal of the optical image that the imaging lens system that has high imaging performance according to by the total length cripeturaization time forms, so, when can seek the miniaturization as module integral body, can obtain the image pickup signal of high-resolution.And, the camera head related according to present embodiment, because of loading its camera module, so, when can seek the miniaturization of camera part, obtain the image pickup signal of high-resolution, can obtain the photographs of high-resolution according to its image pickup signal.
[embodiment]
Below, the concrete numerical value embodiment of the imaging lens system that present embodiment is related is described.Following, the 1st to the 15th numerical value implementation column is concluded explanation.
Figure 16 and Figure 31 represent to have the concrete lens data corresponding to the formation of imaging lens system shown in Figure 1.Especially, represent the lens data that it is basic, represent about aspheric data at Figure 31 at Figure 16.Represent to have the related imaging lens system of couple embodiment 1 on the hurdle of the face number Si of lens data shown in Figure 16, with the face of the lens key element of object side as the 1st (is the 0th with diaphragm St), along with the i that encloses symbol towards the mode that increases successively as side face number.Represent on the hurdle of radius of curvature R i corresponding at the symbol Ri that Fig. 1 enclosed, from the value (mm) of the radius-of-curvature of i face of object side.The interval (mm) from the optical axis of i face Si of object side and i+1 face Si+1 is represented on the hurdle of opposite interval D i too.Represent value to the refractive index of d line (587.6nm) from j optical parameter of object side on the Ndj hurdle.Represent value to the Abbe number of d line from j optical parameter of object side on the vdj hurdle.In the marge of Figure 16 value as the focal distance f (mm) of all data representation total systems.
The imaging lens system that this embodiment 1 is related, the two sides of the 1st lens L1 to the 4 lens L4 all becomes aspherical shape.In the basic lens data of Figure 16, represent to have near the numerical value of the radius-of-curvature (paraxial radius-of-curvature) the optical axis as those aspheric radius-of-curvature.
The aspherical surface data of representing the imaging lens system of embodiment 1 at Figure 31.In as the numerical value shown in the aspherical surface data, mark " E " expression continues in thereafter numerical value for 10 being " power exponent " at the end, and expression 10 is taken advantage of calculation " E " numerical value before for the represented numerical value of exponential function at the end in order to it.For example, if " 1.0E-02 ", then expression " 1.0 * 10
-2".
As aspherical surface data, charge to according to value with each coefficient Ai, K in the formula of the represented aspherical shape of following formula (A).Detailed it, Z represents from falling in the length of perpendicular (mm) that connects plane (perpendicular to the plane of optical axis) on aspheric surface summit under by the point on the aspheric surface of the position of optical axis height h.In the imaging lens system of embodiment 1, each aspheric surface is effectively used coefficient A3～A10 of the 3rd time～the 10th time as asphericity coefficient Ai and is represented.
Z＝C·h
2/{1+(1-K·C
2·h
2)
1/2}+∑Ai·h
i……(A)
In the formula,
Z: the aspheric degree of depth (mm)
H: the distance from the optical axis to the lens face (highly) (mm)
K: heart rate far away
C: paraxial curvature=1/R
(R: paraxial radius-of-curvature)
Ai: the asphericity coefficient of the i time (i is the integer more than 3).
Same with the imaging lens system of above embodiment 1, will be shown in Figure 17 and Figure 32 corresponding to the concrete lens data of the formation of imaging lens system shown in Figure 2 as embodiment 2.And, equally corresponding to the concrete lens data of the formation of the imaging lens system of Fig. 3～shown in Figure 15 as embodiment 3 to embodiment 15, be shown in Figure 18～Figure 30 and Figure 33～Figure 45.In those embodiment 2～15, embodiment 2～8 and embodiment 14～15, same with the imaging lens system of embodiment 1, the two sides of the 1st lens L1 to the 4 lens L4 all becomes aspherical shape.In embodiment 9～13, the two sides of the 1st lens L1 is a spherical shape, and the two sides of the 2nd lens L2 to the 4 lens L4 all is an aspherical shape.
In addition, at Figure 46, each embodiment is summed up the value of expression about above-mentioned pacing items formula (1)～(8).As shown in figure 46, for conditional (1)～(5), each embodiment is all in its numerical range.
In addition, at Figure 46, the value of the H (MAX) that uses when being also illustrated in the maximum lens thickness DM3 in the design conditions formula (3).H (MAX) is the distance (highly) from the optical axis Z1 at the position that becomes maximum lens thickness DM3.
Figure 47 (A)～Figure 47 (D) represents that respectively the spherical aberration at the imaging lens system of embodiment 1 is arranged, astigmatic aberration, distortion aberration (distortion aberration), and multiplying power chromatic aberation.Represent that at each aberration diagram with e line (546.07nm) be the aberration of reference wavelength.In spherical aberration diagram, astigmatic aberration diagram and multiplying power chromatic aberation figure, also represent aberration to F line (wavelength 486.13nm), C line (wavelength 656.27nm).Solid line is represented the aberration of sagitta of arc direction (S) in astigmatic aberration diagram, and dotted line is represented the aberration of tangential direction (T).FNo. represent the F value, Y represents image height.
Similarly, at all aberration of Figure 48 (A)～(D) expression to the imaging lens system of embodiment 2.Similarly, at Figure 49 (A)～(D) to Figure 61 (A)～(D) expression all aberrations to the imaging lens system of embodiment 3 to embodiment 15
As can be known,, can realize high imaging performance in the time of the total length cripeturaization to each embodiment from above each numeric data and each aberration diagram.
In addition, the utility model is not limited to above-mentioned embodiment and each embodiment, can all distortion implement.For example, the radius-of-curvature of each lens composition, face at interval and the value of refractive index etc. be not limited in the value shown in above-mentioned each numerical value embodiment desirable other value.
Claims (6)
1. chip architecture small-sized image pickup lens is characterized in that,
Possess successively from object side:
The face of object side is set as the 1st lens of the positive focal power of having of convex surface near optical axis;
Near optical axis, be set as the 2nd lens of the negative focal power of having of concave surface as the face of side;
Near the 3rd lens that optical axis, have negative focal power;
When the two sides is aspherical shape, as the face of side near optical axis, be set as concave shape, periphery be set as convex form the 4th lens,
And constitute the formula of meeting the following conditions:
-1.5≤f/f3≤-0.005 ……(1)
0.07≤D4/f≤0.3 ……(2)
1.0≤DM3/D5≤1.5 ……(3)
In the formula,
F: whole focal length
F3: the focal length of the 3rd lens
D4: the 2nd lens on the optical axis and the interval between the 3rd lens
DM3: the lens thickness of the maximum in the scope of the effective diameter of the object side of the 3rd lens
D5: the center thickness of the 3rd lens.
2. 4 chip architecture small-sized image pickup lens according to claim 1 is characterized in that,
Formula further meets the following conditions:
v3≤40 ……(4)
In the formula,
V3: the Abbe number of the 3rd lens.
3. 4 chip architecture small-sized image pickup lens according to claim 1 and 2 is characterized in that,
On optical axis, than the outer fringe position of the face of the object side of above-mentioned the 1st lens more by object side configuration diaphragm,
Above-mentioned the 3rd lens are near optical axis, and the face of object side is that the face of the same time image side of concave shape is a convex form,
Above-mentioned the 4th lens are near optical axis, and the face of object side is that the face of the same time image side of convex form is a concave shape.
4. 4 chip architecture small-sized image pickup lens according to claim 1 and 2 is characterized in that,
More disposing diaphragm than above-mentioned the 1st lens by the picture side,
Near the face of above-mentioned the 3rd lens object side optical axis is a concave shape,
Above-mentioned the 4th lens when the face of object side is convex form near optical axis, are concave shape as the face of side.
5. a camera module is characterized in that possessing;
Claim 1 or 2 described 4 chip architecture small-sized image pickup lens; With
Output is according to the imaging apparatus of the image pickup signal of the optical image that is formed by above-mentioned 4 chip architecture small-sized image pickup lens.
6. a camera head is characterized in that possessing, the described camera module of claim 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007271495A JP5015719B2 (en) | 2007-10-18 | 2007-10-18 | Four-element compact imaging lens, camera module, and imaging device |
| JP2007271495 | 2007-10-18 |
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| CN201322821Y true CN201322821Y (en) | 2009-10-07 |
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| JP (1) | JP5015719B2 (en) |
| CN (1) | CN201322821Y (en) |
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| CN116299998A (en) * | 2023-01-28 | 2023-06-23 | 湖北华鑫光电有限公司 | Long depth of field 4P scanning gun camera lens |
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| TWI361914B (en) * | 2007-11-16 | 2012-04-11 | Largan Precision Co Ltd | Optical lens system for taking image |
| JP4845926B2 (en) * | 2008-05-28 | 2011-12-28 | 日立マクセル株式会社 | Lens unit and camera module |
| JP5280326B2 (en) * | 2009-09-18 | 2013-09-04 | 株式会社オプトロジック | Imaging lens |
| TWI436126B (en) | 2011-05-17 | 2014-05-01 | Largan Precision Co Ltd | Image capturing optical lens assembly |
| CN103185953B (en) | 2012-12-28 | 2015-08-19 | 玉晶光电(厦门)有限公司 | Portable electronic devices and its optical imaging lens |
| KR102375648B1 (en) * | 2014-12-17 | 2022-03-17 | 엘지이노텍 주식회사 | Image pickup lens, camera module and digital device including the same |
| TWI563285B (en) | 2015-05-28 | 2016-12-21 | Largan Precision Co Ltd | Photographing lens system, image capturing device, and electronic device |
| JP7357538B2 (en) | 2019-12-24 | 2023-10-06 | 株式会社フジタ | Sealing member |
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| JP2000180719A (en) * | 1998-12-11 | 2000-06-30 | Minolta Co Ltd | Photographic lens system |
| KR100703469B1 (en) * | 2005-07-07 | 2007-04-03 | 삼성전자주식회사 | Optical image forming lens system |
| JP2007121820A (en) * | 2005-10-31 | 2007-05-17 | Mark:Kk | Imaging lens |
| JP2007127953A (en) * | 2005-11-07 | 2007-05-24 | Konica Minolta Opto Inc | Imaging optical system, imaging lens device and digital equipment |
| JP2007148138A (en) * | 2005-11-29 | 2007-06-14 | Kyocera Corp | Image pickup lens, optical module, and portable terminal |
| JP2007225833A (en) * | 2006-02-23 | 2007-09-06 | Kyocera Corp | Imaging lens, optical module and mobile terminal |
| JP2008064884A (en) * | 2006-09-05 | 2008-03-21 | Kyocera Corp | Imaging lens |
| JP4993991B2 (en) * | 2006-10-03 | 2012-08-08 | 三洋電機株式会社 | Imaging lens and imaging apparatus provided with the same |
| JP5052144B2 (en) * | 2007-01-22 | 2012-10-17 | 京セラ株式会社 | Imaging lens |
| KR100711024B1 (en) * | 2007-01-23 | 2007-04-24 | 주식회사 세코닉스 | Laminated lens |
| JP2008281873A (en) * | 2007-05-11 | 2008-11-20 | Sony Corp | Imaging lens |
| JP4947423B2 (en) * | 2007-08-29 | 2012-06-06 | コニカミノルタオプト株式会社 | Imaging lens |
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| CN116299998A (en) * | 2023-01-28 | 2023-06-23 | 湖北华鑫光电有限公司 | Long depth of field 4P scanning gun camera lens |
| CN116299998B (en) * | 2023-01-28 | 2023-10-20 | 湖北华鑫光电有限公司 | Long depth of field 4P scanning gun camera lens |
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| JP5015719B2 (en) | 2012-08-29 |
| JP2009098514A (en) | 2009-05-07 |
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