KR102422780B1 - Image pickup lens, camera module and digital device including the same - Google Patents

Abstract

The embodiment includes first to sixth lenses arranged in order from the object side to the imaging side, wherein the first lens has a positive refractive power, and the second lens and the sixth lens have a negative refractive power, The axial distance from the apex of the object side on the optical axis of the fifth lens to the object side surface of the edge of the sixth lens is from the apex of the object side on the optical axis of the fifth lens to the effective diameter in the direction of the object side of the sixth lens An imaging lens smaller than the axial distance is provided.

Description

An imaging lens, a camera module and a digital device including the same

Embodiments relate to imaging lenses.

The conventional film camera is replaced by a camera module for a portable terminal using a compact solid-state image sensor such as CCD and CMOS, a digital still camera (DSC), a camcorder, a PC camera (imaging device attached to a personal computer), etc. and such an imaging device has been reduced in size and thickness.

In this trend, miniaturization of a light receiving element such as a CCD (Charge Coupled Device) mounted in a miniaturized imaging device is progressing, but the portion of the imaging device that occupies the most volume is the imaging lens.

Accordingly, the most important component in the miniaturization and thinning of the imaging device is an imaging lens that forms an image of an object.

Here, the problem is not only to implement a small imaging lens, but also the imaging lens is required to have high performance in response to the improvement of the performance of the light receiving element. However, the miniaturized imaging lens inevitably becomes closer to the light-receiving element, which causes a problem that the incident angle of light is obliquely incident on the imaging plane of the imaging device, so that the light-collecting performance of the imaging lens is not sufficiently exhibited, It is accompanied by a problem that the brightness of the image can change dramatically from the center of the image to the periphery.

In consideration of this problem, it is necessary to increase the number of lenses, but the volume of the gliding device may increase.

The embodiment is intended to provide an imaging lens having a high performance and an ultra-thin size.

The embodiment includes first to sixth lenses arranged in order from the object side to the imaging side, wherein the first lens has a positive refractive power, and the second lens and the sixth lens have a negative refractive power, The axial distance from the apex of the object side on the optical axis of the fifth lens to the object side surface of the edge of the sixth lens is from the apex of the object side on the optical axis of the fifth lens to the effective diameter in the direction of the object side of the sixth lens An imaging lens smaller than the axial distance is provided.

The axial distance from the apex of the object side on the optical axis of the fifth lens to the apex of the object side on the edge of the sixth lens is from the apex of the object side on the optical axis of the fifth lens to the apex of the object side on the optical axis of the fifth lens It may be smaller than the axial distance.

The axial distance from the apex of the object side on the optical axis of the fifth lens to the apex of the object side on the optical axis of the fifth lens is from the apex of the object side on the optical axis of the fifth lens to the effective diameter in the direction of the object side of the sixth lens may be greater than the axial distance of

The imaging lens may further include a shutter and an iris disposed in front of the target side of the first lens, and the shutter and diaphragm may be spaced apart from the first lens by 0.4 millimeters or more.

The distance on the optical axis of the fifth lens and the sixth lens may be within 0.1 mm.

The first lens may have a meniscus shape convex toward the object.

In the second lens, both the object side and the imaging side may be concave.

In the sixth lens, both the object side and the imaging side may be concave.

Another embodiment includes the above-described imaging lens; a filter that selectively transmits light passing through the imaging lens according to a wavelength; And it provides a camera module including a light receiving element for receiving the light transmitted through the filter.

The light receiving element is an image sensor, and a horizontal and/or vertical length of a unit pixel of the image sensor may be 2 micrometers or less, respectively.

Another embodiment provides a digital device including the above-described camera module.

The imaging lens according to the embodiment is provided in an ultra-thin shape while including six lenses, so that a moving object can be photographed without image distortion.

1 is a view showing a first embodiment of an imaging lens,
Figure 2 is a view showing the thickness and separation distance of each lens in the imaging lens of Figure 1,
3 is a graph showing an aberration diagram of the first embodiment of the imaging lens, and is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion in order from the left;
4 is a graph showing an aberration diagram of the second embodiment of the imaging lens, and is a graph showing longitudinal spherical aberration, astigmatism, and distortion aberration in order from the left;
5 is a graph showing an aberration diagram of the third embodiment of the imaging lens, and is a graph showing longitudinal spherical aberration, astigmatism, and distortion aberration in order from the left.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention that can specifically realize the above objects will be described with reference to the accompanying drawings.

In the description of the embodiment according to the present invention, the term 'target surface' refers to the surface of the lens that faces the object side with respect to the optical axis, and the term 'image-forming surface' refers to the image formation based on the optical axis. The side of the lens that faces the image side.

Also, in the present invention, "+ power" of a lens indicates a converging lens that converges parallel light, and "-power" of a lens indicates a diverging lens that diverges parallel light.

FIG. 1 is a diagram showing the configuration of a first embodiment of the imaging lens, and FIG. 2 is a diagram showing the thickness and separation distance of each lens in the imaging lens of FIG. 1 .

Referring to FIG. 1 , a first embodiment of an imaging lens shows a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , and a fifth lens from an object side to an imaging side. 150 and the sixth lens 160 are included in this order.

The front of the first lens 110 may include a shutter and a stop, and the stop may be a variable aperture. In addition, the filter 170 and the light receiving element 180 may be included in this order to form an imaging lens in the camera module, and a cover glass may be included between the filter 170 and the light receiving element 180 .

The light receiving element 180 may be an image sensor, and a horizontal and/or vertical length of a unit pixel of the image sensor may be 2um (micrometer) or less. The above-described embodiment and the embodiments described below may provide an imaging lens that can be applied to a camera module having a high pixel and/or pixel number, and the above-described camera module includes an image sensor or a light receiving element having a high pixel and/or pixel number. In this case, the horizontal and/or vertical length of the unit pixel may be 2 μm or less.

In FIG. 1 , 'S11' is the target surface of the first lens 110, 'S12' is the imaging plane of the first lens 110, 'S21' is the target surface of the second lens 120, and 'S22' is the imaging plane of the second lens 120 , 'S31' is the target plane of the third lens 130, 'S32' is the imaging plane of the third lens 130, and 'S41' is the fourth lens 140 ), 'S42' is the imaging plane of the fourth lens 140, 'S51' is the target plane of the fifth lens 150, 'S52' is the imaging plane of the fifth lens 150, ' S61' is the target surface of the sixth lens 160, and 'S62' is the imaging surface of the sixth lens 160.

In the filter 170, a flat optical member such as an infrared filter is disposed, the cover glass may be an optical member, for example, a cover glass for protecting an imaging surface, and the light receiving element 180 is a printed circuit board ( It may be an image sensor stacked on (not shown).

In this embodiment, the first lens 110 may have a meniscus shape in which the target surface S11 and the imaging surface S12 are convex toward the target side. The second lens 120 may have a concave shape in which both the target surface S21 and the imaging surface S22 are concave. The third lens 130 may have a meniscus shape convex in the object-side direction, the fourth lens 140 may have a meniscus shape convex in the object-side direction, and the fifth lens 150 may It may have a meniscus shape convex in the imaging direction, and the sixth lens 160 may have a concave shape in which both the target surface S51 and the imaging surface S62 are concave.

Some of the target surfaces and imaging surfaces of the first to sixth lenses 110 to 160 described above may be aspherical. When the aspherical surface is formed on at least one surface of the lenses, various aberrations, for example, spherical aberration, coma It may be excellent in correction of aberration and distortion aberration.

In this embodiment, the first lens 110 may have a positive (+) power configuration, and the second lens 120 and the sixth lens 160 may have a negative (-) power configuration.

In FIG. 1 , the distance D1 between the shutter and the aperture and the first lens 110 may be greater than 0.40 millimeters (mm). When the distance is greater than the distance, damage to the first lens 110 is prevented and mechanical arrangement can be made.

In addition, in order to implement an ultra-thin imaging lens, the optical axis distance of each lens is arranged very close, and the optical axis distance of the fifth lens 150 and the sixth lens 160 may be close, and in detail, the distance in FIG. d5 may be a distance within 0.1 millimeters.

In FIG. 1 , the axial distance D5 from the apex of the object side on the optical axis of the fifth lens 150 to the apex of the imaging side on the optical axis of the fifth lens 150 and the second from the apex of the object side on the optical axis of the fifth lens 6 The on-axis distance D6 of the lens 160 to the effective diameter of the target side may satisfy the following condition.

D6-D5≤0

In addition, the on-axis distance D4 from the apex of the object side surface on the optical axis of the fifth lens 150 to the object side surface side of the edge of the sixth lens 160 may be smaller than the distances D5 and D6 described above. Here, the diameter of the edge of the sixth lens 160 may be larger than the above-described effective diameter, and the effective diameter indicates an area through which light passes, but the edge is an area in which the surface of the sixth lens 160 has a radius of curvature. , and the surface of the sixth lens 160 may be flat outside the edge.

Table 1 is a view showing the curvature, thickness, distance, and refractive index of each lens of the first embodiment of the imaging lens. When the radius of curvature is large, the magnitude of the absolute value of the radius of curvature is considered when the surface of the target side is concave or convex, that is, the absolute value of the radius of curvature is not considered - or the radius of curvature is positive.

radius of curvature thickness or distance (mm) refractive index Object Infinity Infinity iris Infinity 0.6 The target surface of the first lens (S11) 1.80634 0.815 1.544 imaging plane (S12) -3342.67459019 0.085 The target surface of the second lens (S21) -6.42755776202 0.24 1.640 imaging plane (S22) 8.12046557145 0.245 Target surface of the third lens (S31) 5.06537130766 0.305 1.640 imaging plane (S32) 5.62836636619 0.2 Target surface of the fourth lens (S41) 2.64527159736 0.27 1.640 imaging plane (S42) 2.60375820619 0.305 The target surface of the fifth lens (S51) -15.4391011638 0.935 1.531 image plane (S52) -1.31832387348 0.22 Target surface of the sixth lens (S61) -15.0181522219 0.5 1.531 imaging plane (S62) 1.29421449257 0.3541 filter Infinity 0.21 1.523 cover glass Infinity 0.6859

In Table 1, the curvature of the object, the diaphragm, the first to sixth lenses 110 to 160, the filter 170, and the target surface and the image forming surface of the cover glass are sequentially described, and the curvature is positive (+) In the case of , it is a case of bending toward the object, and when it is negative (-), it is a case of bending toward the light receiving element 180 . When the curvature is infinity, it is a flat case, and the thickness is described corresponding to each target surface, and the distance to an adjacent lens is described corresponding to the imaging plane.

Although not shown, each lens may be coated on the surface to prevent reflection or improve surface hardness.

Table 2 shows the conic image (k) and aspheric coefficients (A to G) of each lens surface, but the region where the aspheric coefficient is '0' is not indicated.

k A B C D E F G S11 -1.779032 0.329445E-01 0.467208E-02 -0.141255E-01 0.612771E-02 -0.543120E-04 -0.371779E-02 -0.324490E-04 S12 0.000000 -0.430778E-01 -0.140789E-0 0.143017E-1 -0.751391E-02 0.187781E-02 -0.205595E-02 0.391443E-03 S21 0.000000 0.14789E-02 0.158850E-01 0.219392E-02 0.50768E-02 0.713324E-03 0.147300E-02 -0.990049E-03 S22 -1.0000000 0.163464E-01 0.199321E-01 0.142886E-03 -0.115863E-02 0.535671E-02 -0.328942E-02 0.520525E-02 S31 0.00000000 -0.745082E-01 0.126298E-03 -0.373770E-01 0.101475E-01 0.873367E-03 0.801531E-02 0.572008E-03 S32 -29.957801 -0.584209E-01 0.268922E-01 -0.423259E-01 0.181115E-01 0.7077673E-03 0.244681E-02 S41 0.491853 -0.158810E+00 0.484107E-1 -0.940661E-02 0.472675E-03 S42 -0.389092 -0.120398E+01 0.222764E-01 0.571882E-03 0.609616E-04 -0.506771E-06 -0.642444E-04 S51 -1.00000 0.257871E-01 -0.219967E-01 0.742478E-03 0.151278E-02 0.549491E-04 0.995068E-05 -0.235828E-04 S52 -5.305177 -0.208494E-01 0.101184E-01 -0.260078E-02 0.621319E-03 -0.28764E-05 -0.667722E-05 -0.151042E-05 S61 0.000000 -0.932115E-01 0.124952E-01 0.424006E-03 0.602496E-04 0.281532E-05 -0.160224E-05 -0.241581E-06

The aspheric coefficients H and J of the target surface S61 of the sixth lens are -0.345366E-07 and -0.133570E-07, respectively, and the aspheric coefficient of the imaging surface S62 of the sixth lens K is -7.25557E +00, AR4 is -7.5151E-02, AR5 is 1.8339E-02, AR6 is 9.5930E-03, AR7 is -1.0238E+03, AR8 is -2.8552E-03, AR9 is 1.2132E -04, AR10 is 4.6243E-04, AR11 is -1.7769E-05, AR12 is -3.9786ㄸ-05, AR13 is 1.8887E-06, and AR14 is 1.0623E-06.

3 is a graph showing an aberration diagram of the first embodiment of the imaging lens, and is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion in order from the left.

In FIG. 3 , the Y-axis means the size of the image, the X-axis means the focal length (in mm) and the degree of distortion (in %), and as the curves approach the Y-axis, the aberration correction function may be improved.

Table 3 is a view showing the curvature, thickness, distance, and refractive index of each lens of the second embodiment of the imaging lens. When the radius of curvature is large, when the surface of the target side is concave or convex, that is, the magnitude of the absolute value of the radius of curvature is taken into consideration without considering that the radius of curvature has - or +.

radius of curvature thickness or distance (mm) refractive index Object Infinity Infinity iris Infinity -0.250000 The target surface of the first lens (S11) 1.75682 0.758763 1.544 imaging plane (S12) 16.66297 0.085000 The target surface of the second lens (S21) -9.70518 0.240000 1.640 imaging plane (S22) 7.36635 0.248144 Target surface of the third lens (S31) 5.01860 0.309171 1.640 imaging plane (S32) 5.38791 0.280472 Target surface of the fourth lens (S41) 2.61040 0.281606 1.640 imaging plane (S42) 2.56088 0.340138 The target surface of the fifth lens (S51) -14.50927 0.934230 1.531 image plane (S52) -1.24777 0.191879 Target surface of the sixth lens (S61) -6.80556 0.500000 1.531 imaging plane (S62) 1.238569 0.354090 filter Infinity 0.210000 1.523 cover glass Infinity 0.716504

In Table 3, the curvatures of the object, the diaphragm, the first to sixth lenses 110 to 160, the filter 170, and the target surface and the image forming surface of the cover glass are sequentially described, and the curvature is positive (+) In the case of , it is a case of bending toward the object, and when it is negative (-), it is a case of bending toward the light receiving element 180 . When the curvature is infinity, it is a flat case, and the thickness is described corresponding to each target surface, and the distance to an adjacent lens is described corresponding to the imaging plane.

Although not shown, each lens may be coated on the surface to prevent reflection or improve surface hardness.

Table 4 shows the conic image (k) and aspheric coefficients (A to G) of each lens surface, but the region where the aspheric coefficient is '0' is not indicated.

k A B C D E F G S11 -1.713061 0.349086E-01 0.692388E-02 -0.139764E-01 0.607875E-02 -0.122057E-04 -0.348241E-02 -0.192110E-03 S12 0.000000 -0.396705E-01 -0.127210E-0 0.155935E-1 -0.669939E-02 0.216828E-02 -0.202949E-02 0.215926E-03 S21 0.000000 0.181524E-02 0.176521E-01 0.262340E-02 0.533799-02 0.552183E-03 0.158830E-02 -0.754858E-03 S22 -1.0000000 0.194830E-01 0.167739E-01 -0.108661E-03 -0.171246E-02 0.447822E-02 -0.378464E-02 0.481471E-02 S31 0.00000000 -0.748956E-01 -0.430599E-02 -0.388112E-01 0.943528E-01 0.481624E-03 0.761902E-02 -0.397647E-03 S32 -26.431761 -0.542810E-01 0.300816E-01 -0.419710E-01 0.181303E-01 0.806488E-03 0.271661E-02 S41 0.491853 -0.154149E+00 0.510206E-1 -0.887048E-02 0.737472E-04 S42 -0.389092 -0.116488E+01 0.221545E-01 0.289368E-03 0.903024E-04 -0.143353E-04 -0.742518E-04 S51 -1.00000 0.274273E-01 -0.223215E-01 0.542088E-03 0.147313E-02 0.423199E-04 0.821725E-05 -0.234185E-04 S52 -4.851506 -0.275865E-01 0.101726E-01 -0.240409E-02 0.646191E-03 -0.684517-06 -0.674684E-05 -0.166869E-05 S61 0.000000 -0.883690E-01 0.131827E-01 0.502407E-03 0.532746E-04 0.770441E-06 -0.212524E-05 -0.271358E-06

The aspheric coefficients H and J of the target surface S61 of the sixth lens are -0.296247E-07 and -0.108352E-07, respectively, and the aspheric coefficient of the imaging surface S62 of the sixth lens K is -8.6669E +00, AR4 is -7.7925E-02, AR5 is 2.0662E-02, AR6 is 9.8607E-03, AR7 is -1.1717E+03, AR8 is -2.9168E-03, AR9 is 1.0631E -04, AR10 is 4.6726E-04, AR11 is -1.5560E-05, AR12 is -3.9430E-05, AR13 is 1.8511E-06, and AR14 is 1.0623E-06.

4 is a graph showing an aberration diagram of the first embodiment of the imaging lens, and is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion in order from the left.

In FIG. 4 , the Y-axis means the size of the image, the X-axis means the focal length (in mm) and the degree of distortion (in %), and as the curves approach the Y-axis, the aberration correction function may be improved.

Table 5 is a view showing the curvature, thickness, distance, and refractive index of each lens of the second embodiment of the imaging lens. When the radius of curvature is large, when the surface of the target side is concave or convex, that is, the magnitude of the absolute value of the radius of curvature is taken into consideration without considering that the radius of curvature has - or +.

radius of curvature thickness or distance (mm) refractive index Object Infinity Infinity iris Infinity -0.250000 The target surface of the first lens (S11) 1.75682 0.738298 1.544 imaging plane (S12) 16.66297 0.085000 The target surface of the second lens (S21) -9.70518 0.250000 1.640 imaging plane (S22) 7.36635 0.222787 Target surface of the third lens (S31) 5.01860 0.250000 1.640 imaging plane (S32) 5.38791 0.174436 Target surface of the fourth lens (S41) 2.61040 0.309801 1.640 imaging plane (S42) 2.56088 0.274266 The target surface of the fifth lens (S51) -14.50927 1.049212 1.531 image plane (S52) -1.24777 0.146200 Target surface of the sixth lens (S61) -6.80556 0.500000 1.531 imaging plane (S62) 1.238569 0.462134 filter Infinity 0.210000 1.523 cover glass Infinity 0.627899

In Table 5, the curvatures of the object, the diaphragm, the first to sixth lenses 110 to 160, the filter 170, and the target surface and the image forming surface of the cover glass are sequentially described, and the curvature is positive (+) In case of , it is a case of bending toward the object side, and in the case of negative (-), it is a case of bending toward the light receiving element. When the curvature is infinity, it is a flat case, and the thickness is described corresponding to each target surface, and the distance to an adjacent lens is described corresponding to the imaging plane.

Although not shown, each lens may be coated on the surface to prevent reflection or improve surface hardness.

Table 6 shows the conic image (k) and aspheric coefficients (A to G) of each lens surface, but the region where the aspheric coefficient is '0' is not indicated.

k A B C D E F G S11 -2.072309 0.357836E-01 0.215454E-02 -0.238336E-01 0.120178E-01 -0.639871E-03 -0.824965E-02 0.321061E-03 S12 0.000000 -0.536069E-01 -0.352068E-01 0.317356E-1 -0.179836E-02 0.180318E-02 -0.151140E-02 -0.866887E-03 S21 54.094330 0.514565E-02 0.135438E-01 -0.273663E-02 0.744312E-02 0.000000E+00 0.000000E+00 0.000000E+00 S22 -30.018800 0.470596E-01 0.117599E-01 -0.204605E-03 -0.285040E-02 0.135112E-01 -0.458255E-02 0.000000E+00 S31 109.404168 -0.397656E-02 -0.284916E-02 -0.497829E-01 0.366879E-01 -0.898710E-02 0.345489E-02 0.000000E+00 S32 -8.266946 -0.407535E-01 0.600141E-01 -0.639574E-01 0.249508E-01 0.570802E-03 0.113777E-03 0.000000E+00 S41 0.491853 -0.176022E+00 0.636283E-01 -0.161904E-02 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 S42 0.176629 -0.112713E+00 0.132853E-01 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 S51 3.077045 0.372118E-01 -0.289360E-01 -0.626112E-03 0.165491E-02 0.175363E-05 0.540399E-04 0.736813E-06 S52 -4.616796 -0.447513E-01 0.122004E-01 -0.353208E-02 0.988021E-03 0.172425E-04 -0.556353E-05 -0.387630E-05 S61 0.000000 -0.117580E-01 0.141863E-01 0.557476E-03 0.862750E-04 0.000000E+00 -0.365220E-05 0.000000E+00

The aspheric coefficients H and J of the target surface of the first to sixth lenses are both 0.000000E+00, the aspheric coefficient of the imaging surface S62 of the sixth lens K is -6.6137E+00, and AR4 is -8.0663E-02, AR5 is 1.1278E-02, AR6 is 1.7313E-02, AR7 is -1.0321E+03, AR8 is -4.5711E-03, AR9 is 3.3669E-05, AR10 is 7.4848E-04, AR11 may be -4.6807E-06, AR12 may be -6.3111E-05, AR13 may be 4.6499E-07, and AR14 may be 2.0030E-06.

5 is a graph showing an aberration diagram of the first embodiment of the imaging lens, and is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion in order from the left.

In FIG. 5 , the Y-axis means the size of the image, the X-axis means the focal length (in mm) and the degree of distortion (in %), and as the curves approach the Y-axis, the aberration correction function may be improved.

The camera module including the above-described imaging lens may be embedded in various digital devices such as a digital camera, a smart phone, a notebook computer, and a tablet PC.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in the range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

110: first lens 120: second lens
130: third lens 140: fourth lens
150: fifth lens 160: sixth lens
170: filter 180: light receiving element

Claims (11)

1st to 6th lenses arranged in order from the target side to the imaging side, and a shutter and a diaphragm disposed in front of the target side of the first lens,
The first lens has a positive refractive power, the second lens and the sixth lens has a negative refractive power,
The axial distance from the apex of the object side on the optical axis of the fifth lens to the object side surface of the edge of the sixth lens is from the apex of the object side on the optical axis of the fifth lens to the effective diameter in the direction of the object side of the sixth lens smaller than the axial distance,
The first lens has a meniscus shape convex toward the object,
The second lens has both the object side and the imaging side are concave,
Outside the edge, the target side of the sixth lens is flat,
The third lens has a meniscus shape convex toward the object,
The fourth lens has a meniscus shape convex toward the object,
The shutter and the aperture are spaced apart from the first lens,
The second lens is an imaging lens having an effective diameter smaller than that of the first lens. The method of claim 1,
The axial distance from the apex of the object side on the optical axis of the fifth lens to the apex of the object side of the edge of the sixth lens is from the apex of the object side on the optical axis of the fifth lens to the vertex of the imaging side on the optical axis of the fifth lens An imaging lens smaller than the axial distance of . The method of claim 1,
The axial distance from the apex of the object side on the optical axis of the fifth lens to the apex of the imaging surface on the optical axis of the fifth lens is the effective diameter in the direction of the object side of the sixth lens from the apex of the object side on the optical axis of the fifth lens An imaging lens greater than the axial distance to . The method of claim 1,
The shutter and the aperture are spaced apart from the first lens by 0.4 millimeters or more. The method of claim 1,
The optical axis distance between the fifth lens and the sixth lens is within 0.1 mm. delete The method of claim 1,
The target side of the sixth lens is
the flat edge; and
a concave surface positioned between the edges;
The end of the effective mirror in the direction of the target side of the sixth lens is spaced apart from the edge and located on the concave surface of the sixth lens,
The optical axis distance between the fifth lens and the sixth lens is within 0.1 mm. The method of claim 1,
The sixth lens is an imaging lens in which both the object side and the imaging side are concave. The imaging lens of any one of claims 1 to 5 and 7;
a filter that selectively transmits light passing through the imaging lens according to a wavelength; and
A camera module including a light receiving element for receiving the light passing through the filter. 10. The method of claim 9,
The light receiving element is an image sensor, and a horizontal and/or vertical length of a unit pixel of the image sensor is 2 micrometers or less, respectively. A digital device comprising the camera module of claim 10 .

Images