KR102355282B1 - Optical system and camera module for comprising the same - Google Patents

Abstract

An optical system according to an embodiment of the present invention includes: a first lens, which are sequentially arranged from an object side to an image side; a second lens; a third lens; a fourth lens; and a fifth lens, wherein the second lens has an object-side surface concave toward the object side and an image-side surface concave toward the image side, and the third lens has a meniscus in which the object-side surface and the image-side surface are convex toward the image side with respect to the optical axis. The fourth lens has a meniscus shape in which the object side surface and the image side surface are convex toward the image side with respect to the optical axis.

Description

Optical system and camera module including the same

The present invention relates to a camera module, and more particularly, to an optical system and a camera module including the same.

As the technology of the portable terminal and the camera embedded therein develops, the demand for slimness, low power consumption, high resolution and weight reduction of the camera module is increasing.

For slimming and lightening, a camera module including five lenses has been proposed. The camera module includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, and a negative refractive power from the object side to the image side. The fifth lens having a refractive power of may have a structure in which the fifth lens is sequentially arranged.

Such a camera module has a problem in that it is difficult to obtain satisfactory optical performance due to design restrictions.

Accordingly, there is a need for an optical system that can be implemented in a compact size while satisfying resolution, and a camera module including the same.

An object of the present invention is to provide an optical system and a camera module including the same.

An optical system according to an embodiment of the present invention includes: a first lens, which are sequentially arranged from an object side to an image side; a second lens; a third lens; a fourth lens; and a fifth lens, wherein the fourth lens has an object-side surface convex, and the fifth lens has an object-side surface convex.

An object side surface of the first lens may be convex.

The second lens may have a convex object side surface.

The third lens may have a concave object side surface.

An image side surface of the first lens may be concave.

The third lens may have a convex image side.

The third lens may have a meniscus shape convex toward the image.

The fourth lens may have a meniscus shape convex toward the image.

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

The first lens may have positive refractive power.

The second lens may have negative refractive power.

The third lens may have negative refractive power.

The fourth lens may have positive refractive power.

The fifth lens may have negative refractive power.

A camera module according to an embodiment includes a first lens, including an imaging lens, arranged in order from an object side to an image side; a second lens; a third lens; a fourth lens; and a fifth lens, wherein the fourth lens has an object-side surface convex, and the fifth lens has an object-side surface convex.

According to an embodiment of the present invention, it is possible to obtain an optical system and a camera module that has good chromatic aberration correction, satisfies resolving power, can cope with high pixel resolution, and can be implemented in a compact size. Such a camera module can be applied to a portable terminal that is being miniaturized, slimmer, and high-performance.

1 is a cross-sectional view of an optical system according to a first embodiment of the present invention.
2 is a cross-sectional view of an optical system according to a second embodiment of the present invention.
3 is a cross-sectional view of an optical system according to a third embodiment of the present invention.
4, 6 and 8 are graphs obtained by measuring spherical aberration, astigmatic field curves, and distortion of the optical system according to the first to third embodiments of the present invention, and FIG. 5 , 7 and 9 are graphs in which coma aberrations of the optical system according to the first to third embodiments of the present invention are measured.
10 is a cross-sectional view of a camera module including an optical system according to an embodiment of the present invention.

Since the present invention may have various changes and may have various embodiments, specific embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms including an ordinal number such as second, first, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In the optical system according to an embodiment of the present invention, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are sequentially arranged from the object side to the image side. ) and a fifth lens L5. In addition, the first lens L1 may have a positive refractive power. The second lens L2 may have negative refractive power. The third lens L3 may have negative refractive power. The fourth lens L4 may have a positive refractive power. The fifth lens L5 may have negative refractive power. And, the optical system according to the embodiment of the present invention may satisfy Conditional Expressions 1 to 3.

(Conditional Expression 1) Ø5> Ø2>Ø3

(Conditional Expression 2) N3d>1.6

(Condition 3) 20<V3d<30

Here, Ø5 is the refractive power of the fifth lens, Ø2 is the refractive power of the second lens, Ø3 is the refractive power of the third lens, N3d is the refractive index of the third lens at the d-line, and V3d is the third lens Abbe number at the d-line of the lens. The refractive power of each lens can be expressed as the reciprocal of the effective focal length.

When three lenses out of five lenses, such as the second lens L2, the third lens L3, and the fifth lens L3, have negative refractive power, the number of surfaces having a diverging action increases, so that the periphery of the screen good imaging performance can be obtained.

And, among the three lenses having negative refractive power, the fifth lens L5 has the largest refractive power, followed by the refractive power of the second lens L2 and the third lens L3. Accordingly, chromatic aberration can be corrected, and distortion can be satisfactorily corrected.

And, if the refractive index (N3d) and Abbe number (V3d) in the d-line of the third lens are set as in Conditional Expressions 2 and 3, the dispersion and refractive power of the third lens are properly maintained to correct chromatic aberration and distortion. can

In addition, the optical system according to the embodiment of the present invention may further satisfy Conditional Expressions 4 to 5.

(Conditional Expression 4) 0.8<f1/F<1.2

(Conditional Expression 5) Ø4> Ø1

Here, f1 is the effective focal length of the first lens, F is the total effective focal length of the optical system, Ø4 is the refractive power of the fourth lens, and Ø1 is the refractive power of the first lens. The refractive power of each lens can be expressed as the reciprocal of the effective focal length.

As described above, if the ratio of the effective focal length of the first lens L1 to the total effective focal length satisfies Conditional Expression 4, the optical system can be miniaturized and chromatic aberration can be maintained well. When f1/F is 0.8 or less, chromatic aberration correction becomes difficult due to the optical power of the first lens L1. And, when f1/F is 1.2 or more, since the total length of an optical system becomes long, size reduction becomes difficult.

In addition, the refractive power of the fourth lens L4 among the two lenses having positive refractive power may be set to be greater than that of the first lens L1 . Accordingly, chromatic aberration can be corrected, and distortion can be satisfactorily corrected.

In addition, the refractive power of three lenses (second lens, third lens, and fifth lens) having negative refractive power is designed as in Conditional Expression 1, and two lenses (first lens, fourth lens) having positive refractive power If the refractive power of the lens) is designed as in Conditional Expression 5, the ratio of the focal lengths of the first to fifth lenses is appropriately set, so that the refractive power is dispersed. The correction effect can be increased.

1 is a cross-sectional view of an optical system according to a first embodiment of the present invention.

Referring to FIG. 1 , the optical system 100 includes a first lens 110 , a second lens 120 , a third lens 130 , and a fourth lens sequentially arranged from an object side to an image side. 140 , a fifth lens 150 , a filter 160 , and an image sensor 170 .

Light corresponding to image information of an object passes through the first to fifth lenses 110 to 150 and the filter 160 and is incident on the image sensor 170 .

The filter 160 may be an IR (Infrared) filter. The filter 160 may block near-infrared light, for example, light having a wavelength of 700 nm to 1100 nm from light incident into the camera module. And, the image sensor 170 may be connected to the printed circuit board by a wire (wire). The image sensor 170 may be, for example, a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) sensor.

The first lens 110 may have a positive refractive power. In addition, the first lens 110 may include at least one convex surface. For example, the first lens 110 may include a convex surface toward the object. Both sides may be convex.

The second lens 120 may have negative refractive power. In addition, the second lens 120 may include at least one concave surface. For example, the second lens 120 may include a surface concave toward the image. Both sides may be concave.

The third lens 130 may have negative refractive power. In addition, the third lens 130 may include a meniscus shape convex toward the image. The upper surface may have an upwardly convex shape.

The fourth lens 140 may have a positive refractive power. In addition, the fourth lens 140 may include a meniscus shape convex toward the image. The upper surface may have an upwardly convex shape.

The fifth lens 150 may have negative refractive power. In addition, the fifth lens 150 may include a meniscus shape convex toward the object. The water side may have a convex shape toward the water side.

In this case, the image side surface of the fifth lens 150 may be an aspherical surface. Accordingly, it is possible to satisfactorily correct the chromatic aberration in the periphery of the screen.

Also, the fifth lens 150 may have at least one inflection point at a position other than the intersection point with the optical axis. Here, the inflection point means a point on the aspherical surface at which the tangent plane of the aspherical vertex is perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius. Accordingly, it is possible to adjust the maximum exit angle of the chief ray incident on the image sensor 170 , thereby preventing the periphery of the screen from becoming dark, and it is easy to secure the telecentric characteristic of the upper luminous flux.

At least one of the first lens 110 to the fifth lens 150 may be made of a plastic material. Accordingly, it is possible to implement an optical system that is lightweight and has a low manufacturing cost.

Meanwhile, an aperture 180 may be further disposed between the object side and the first lens 110 . The diaphragm 180 may selectively converge the incident light to adjust the focal length. When the diaphragm 180 is located closer to the object side than the first lens 110 , it is possible to reduce the length of the overall length, thereby realizing a compact optical system.

Table 1 shows the optical characteristics of the five lenses according to the embodiment of FIG. 1 . In the embodiment of FIG. 1, F, which is the total effective focal length, is 3.75 mm, and the distance from the object side surface of the first lens to the image surface is 4.55 mm.

Lens No. Lens surface No. radius of curvature (R, mm) Thickness (mm) Effective focal length (f, mm) refractive index (Nd) Abbesu (Vd) first lens R1 1.530 0.800 3.13 1.531 55.7 R2 14.376 0.100 second lens R3 15.883 0.251 -9.56 1.635 24.0 R4 4.373 0.451 third lens R5 -2.916 0.288 -10.08 1.635 24.0 R6 -5.554 0.100 4th lens R7 -77.330 0.654 2.51 1.544 56.1 R8 -1.370 0.161 5th lens R9 3.383 0.469 -2.49 1.544 56.1 R10 0.923 -

Here, the thickness (mm) represents the distance from each lens surface to the next lens surface. Referring to Table 1, in the optical system according to the first embodiment of the present invention, the first lens has a positive refractive power, It can be seen that the second lens has negative refractive power, the third lens has negative refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power. And, it can be seen that the refractive power of the fifth lens, Ø5, is 1/2.49, the refractive power of the second lens, Ø2, is 1/9.56, and the refractive power of the third lens, Ø3, is 1/10.08. In addition, it can be seen that the refractive index N3d at the d-line of the third lens is 1.635, and the Abbe number V3d at the d-line of the third lens is 24.0.

Also, since the total effective focal length F of the first embodiment is 3.75, it can be seen that f1/F is 3.13/3.75. And, it can be seen that the refractive power of the fourth lens Ø4 is 1/2.51, and the refractive power of the first lens Ø1 is 1/3.13.

2 is a cross-sectional view of an optical system according to a second embodiment of the present invention. Descriptions similar to those of the first embodiment of FIG. 1 will be omitted.

Referring to FIG. 2 , the optical system 200 includes a first lens 210 , a second lens 220 , a third lens 230 , and a fourth lens sequentially arranged from the object side to the image side. 240 , a fifth lens 250 , a filter 260 , and an image sensor 270 .

The first lens 210 may have a positive refractive power. In addition, the first lens 210 may include at least one convex surface. For example, the first lens 210 may include a convex surface toward the object. Both sides may be convex.

The second lens 220 may have negative refractive power. In addition, the second lens 220 may include at least one concave surface. For example, the second lens 220 may include a surface concave toward the image side. Both sides can be concave

The third lens 230 may have negative refractive power. In addition, the third lens 230 may include a meniscus shape convex toward the image. The upper surface may have a shape convex upward.

The fourth lens 240 may have a positive refractive power. In addition, the fourth lens 240 may include a meniscus shape convex toward the image. The upper surface may have a shape convex upward.

The fifth lens 250 may have negative refractive power. In addition, the fifth lens 250 may include a meniscus shape convex toward the object side. The water side may have a convex shape toward the water side.

In this case, the image side surface of the fifth lens 250 may be an aspherical surface. Accordingly, it is possible to satisfactorily correct the chromatic aberration in the periphery of the screen.

Also, the fifth lens 250 may have at least one inflection point at a position other than the intersection point with the optical axis. Here, the inflection point means a point on the aspherical surface at which the tangent plane of the aspherical vertex is perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius. Accordingly, it is possible to adjust the maximum emission angle of the chief ray incident on the image sensor 270 , thereby preventing the darkening of the periphery of the screen, and it is easy to secure the telecentric characteristic of the upper luminous flux.

Meanwhile, an aperture 280 may be further disposed between the object side and the first lens 210 . The diaphragm 280 may selectively converge the incident light to adjust the focal length. When the diaphragm 280 is located closer to the object side than the first lens 210 , it is possible to reduce the length of the overall length, thereby realizing a compact optical system.

Table 2 shows optical characteristics of the five lenses according to the embodiment of FIG. 2 . In the embodiment of FIG. 2 , the total effective focal length, F, is 3.79 mm, and the distance (TTL) from the object-side surface of the first lens to the image surface is 4.58 mm.

Lens No. Lens surface No. radius of curvature (R, mm) Thickness (mm) Effective focal length (f, mm) refractive index (Nd) Abbesu (Vd) first lens R1 1.548 0.750 3.17 1.531 55.7 R2 14.610 0.100 second lens R3 16.004 0.272 -9.67 1.635 24.0 R4 4.442 0.457 third lens R5 -2.948 0.292 -9.89 1.635 24.0 R6 -5.719 0.100 4th lens R7 354.409 0.658 2.52 1.544 56.1 R8 -1.383 0.168 5th lens R9 3.285 0.462 -2.45 1.544 56.1 R10 0.906 -

Here, the thickness (mm) represents the distance from each lens surface to the next lens surface. Referring to Table 2, in the optical system according to the second embodiment of the present invention, the first lens has a positive refractive power, It can be seen that the second lens has negative refractive power, the third lens has negative refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power. Further, it can be seen that the refractive power of the fifth lens, Ø5, is 1/2.45, the refractive power of the second lens, Ø2, is 1/9.67, and the refractive power of the third lens, Ø3, is 1/9.89. In addition, it can be seen that the refractive index N3d of the d-line of the third lens is 1.635, and the Abbe's number V3d of the d-line of the third lens is 24.0.

Also, since the total effective focal length F of the first embodiment is 3.79, it can be seen that f1/F is 3.17/3.79. Also, it can be seen that the refractive power of the fourth lens, Ø4, is 1/2.52, and the refractive power of the first lens, Ø1, is 1/3.17.

3 is a cross-sectional view of an optical system according to a third embodiment of the present invention. Descriptions similar to those of the first embodiment of FIG. 1 will be omitted.

Referring to FIG. 3 , the optical system 300 includes a first lens 310 , a second lens 320 , a third lens 330 , and a fourth lens sequentially arranged from the object side to the image side. 340 , a fifth lens 350 , a filter 360 , and an image sensor 370 .

The first lens 310 may have a positive refractive power. In addition, the first lens 310 may include at least one convex surface. For example, the first lens 310 may include a convex surface toward the object. Both sides can be convex

The second lens 320 may have a negative refractive power. In addition, the second lens 320 may include at least one concave surface. For example, the second lens 320 may include a surface concave toward the image side. Both sides can be concave

The third lens 330 may have negative refractive power. In addition, the third lens 330 may include a meniscus shape convex toward the image. The upper surface may have a shape convex upward.

The fourth lens 340 may have a positive refractive power. In addition, the fourth lens 340 may include a meniscus shape convex toward the image. The upper surface may have a shape convex upward.

The fifth lens 350 may have negative refractive power. In addition, the fifth lens 350 may include a meniscus shape convex toward the object. The water side may have a convex shape toward the water side.

In this case, the image side surface of the fifth lens 350 may be an aspherical surface. Accordingly, it is possible to satisfactorily correct the chromatic aberration in the periphery of the screen.

Also, the fifth lens 350 may include at least one inflection point at a position other than the intersection with the optical axis. Here, the inflection point means a point on the aspherical surface at which the tangent plane of the aspherical apex is perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius. Accordingly, it is possible to adjust the maximum emission angle of the chief ray incident on the image sensor 370 , thereby preventing the periphery of the screen from becoming dark, and it is easy to secure the telecentric characteristic of the upper luminous flux.

Meanwhile, an aperture 380 may be further disposed between the object side and the first lens 310 . The diaphragm 380 may selectively converge the incident light to adjust the focal length. When the diaphragm 380 is located closer to the object side than the first lens 310 , it is possible to reduce the length of the overall length, thereby realizing a compact optical system.

Table 3 shows optical characteristics of the five lenses according to the embodiment of FIG. 3 . In the embodiment of FIG. 3 , F, which is the total effective focal length, is 3.77 mm, and the distance (TTL) from the object-side surface of the first lens to the image surface is 4.56 mm.

Lens No. Lens surface No. radius of curvature (R, mm) Thickness (mm) Effective focal length (f, mm) refractive index (Nd) Abbesu (Vd) first lens R1 1.523 0.750 3.18 1.531 55.7 R2 12.271 0.100 second lens R3 12.388 0.265 -10.14 1.635 24.0 R4 4.231 0.456 third lens R5 -2.910 0.287 -10.15 1.635 24.0 R6 -5.466 0.100 4th lens R7 -119.253 0.670 2.55 1.544 56.1 R8 -1.382 0.168 5th lens R9 4.164 0.456 -2.53 1.544 56.1 R10 1.000 -

Here, the thickness (mm) represents the distance from each lens surface to the next lens surface. Referring to Table 3, in the optical system according to the third embodiment of the present invention, the first lens has a positive refractive power, It can be seen that the second lens has negative refractive power, the third lens has negative refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power. Also, it can be seen that the refractive power of the fifth lens, Ø5, is 1/2.53, the refractive power of the second lens, Ø2, is 1/10.14, and the refractive power of the third lens, Ø3, is 1/10.15. In addition, it can be seen that the refractive index N3d of the d-line of the third lens is 1.635, and the Abbe's number V3d of the d-line of the third lens is 24.0.

Also, since the total effective focal length F of the first embodiment is 3.77, it can be seen that f1/F is 3.18/3.77. Also, it can be seen that the refractive power of the fourth lens, Ø4, is 1/2.55, and the refractive power of the first lens, Ø1, is 1/3.18.

As such, it can be seen that the optical systems according to the first to third embodiments satisfy Conditional Expressions 1 to 3. And, it can be seen that conditional expressions 4 to 5 are further satisfied.

(Conditional Expression 1) Ø5> Ø2>Ø3

(Condition 2) N3d>1.6

(Condition 3) 20<V3d<30

Here, Ø5 is the refractive power of the fifth lens, Ø2 is the refractive power of the second lens, Ø3 is the refractive power of the third lens, N3d is the refractive index at the d-line of the third lens, and V3d is the third lens Abbe number at the d-line of the lens.

(Conditional Expression 4) 0.8<f1/F<1.2

(Conditional Expression 5) Ø4>Ø1

Here, f1 is the effective focal length of the first lens, F is the total effective focal length of the optical system, Ø4 is the refractive power of the fourth lens, and Ø1 is the refractive power of the first lens.

The refractive power of each lens can be expressed as the reciprocal of the effective focal length.

4 is a graph of measuring spherical aberration, astigmatic field curves, and distortion of an optical system according to a first embodiment of the present invention, and FIG. 5 is a first embodiment of the present invention. It is a graph measuring coma aberration of an optical system according to an example.

6 is a graph of measuring spherical aberration, astigmatic field curves, and distortion of an optical system according to a second embodiment of the present invention, and FIG. 7 is a second embodiment of the present invention. It is a graph measuring coma aberration of an optical system according to an example.

8 is a graph of measuring spherical aberration, astigmatic field curves, and distortion of an optical system according to a third embodiment of the present invention, and FIG. 9 is a third embodiment of the present invention. It is a graph measuring coma aberration of an optical system according to an example.

Spherical aberration represents spherical aberration according to each wavelength, astigmatism represents the aberration characteristics of tangential plane and sagital plane according to the height of the image plane, and distortion aberration indicates the degree of distortion according to the height of the image plane. indicates. And, the coma aberration shows tangential aberration characteristics and sagittal aberration characteristics at each wavelength according to the height of the image plane.

* Referring to FIGS. 4 to 9 , since values of images appear adjacent to the axis in almost all fields, it can be seen that the optical system according to the embodiment of the present invention has excellent aberration characteristics.

Meanwhile, the optical system according to an embodiment of the present invention may be applied to a camera module. 10 is a cross-sectional view of a camera module including an optical system according to an embodiment of the present invention.

Referring to FIG. 10 , the camera module 600 includes a lens assembly 610 , a filter 620 , an image sensor 630 , a printed circuit board 640 , and a lens holder 650 .

The image sensor 630 may be mounted on the printed circuit board 640 , the filter 620 may be formed on the image sensor 630 , and the lens assembly 610 may be formed on the filter 620 .

The image sensor 630 may be connected to the printed circuit board 640 by a wire. The image sensor 630 may be, for example, a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) sensor.

The filter 620 may be an IR (Infrared) filter. The filter 620 may block near-infrared rays, for example, light having a wavelength of 700 nm to 1100 nm from light incident into the camera module 600 .

The filter 620 and the lens assembly 610 may be embedded in the lens holder 650 and supported.

The camera module according to an embodiment of the present invention may be embedded in a mobile terminal such as a smart phone, a tablet PC, a laptop computer, and a PDA.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as described in the claims below. You will understand that it can be done.

100: optical system
110-150: Lens
160: filter
170: image sensor
180: aperture

Claims (15)

arranged in order from the object side to the image side,
a first lens;
a second lens;
a third lens;
a fourth lens; and
5th lens; including,
The second lens has an object-side surface concave toward the object side and an image-side surface concave toward the image side,
The third lens has a meniscus shape in which the object side surface and the image side surface are convex toward the image side with respect to the optical axis,
The fourth lens has a meniscus shape in which the object side surface and the image side surface are convex toward the image side with respect to the optical axis,
An optical system that further satisfies the following conditional expressions 4 to 5.
(Conditional Expression 4) 0.8<f1/F<1.2
(Conditional Expression 5) Ø4>Ø1
Here, f1 is the effective focal length of the first lens, F is the total effective focal length of the optical system, Ø4 is the refractive power of the fourth lens, and Ø1 is the refractive power of the first lens.
According to claim 1,
The first lens is an optical system in which the object side is convex.
The method of claim 1,
The third lens is an optical system in which the object side is concave.
According to claim 1,
The first lens is an optical system in which the image side is concave.
The method of claim 1,
The third lens is an optical system in which the image side is convex.
The method of claim 1,
The first lens is an optical system having a positive refractive power.
7. The method of claim 6,
The second lens is an optical system having a negative refractive power.
8. The method of claim 7,
The third lens is an optical system having a negative refractive power.
9. The method of claim 8,
The fourth lens is an optical system having a positive refractive power.
10. The method of claim 9,
The fifth lens is an optical system having a negative refractive power.
The method of claim 1,
An optical system that satisfies all of the following Conditional Expressions 1 to 3.
(Conditional Expression 1) Ø5>Ø2>Ø3
(Conditional Expression 2) N3d>1.6
(Condition 3) 20<V3d<30
Here, Ø5 is the refractive power of the fifth lens, Ø2 is the refractive power of the second lens, Ø3 is the refractive power of the third lens, N3d is the refractive index at the d-line of the third lens, and V3d is the third lens Abbe number at the d-line of the lens.
delete The method of claim 1,
The fifth lens is an optical system having a meniscus shape in which the object side surface and the image side surface are convex toward the object side with respect to the optical axis.
The method of claim 1,
The fifth lens has at least one point of inflection at a position other than the point of intersection with the optical axis.
comprising an imaging lens;
arranged in order from the object side to the image side,
a first lens;
a second lens;
a third lens;
a fourth lens; and
5th lens; including,
The second lens has an object-side surface concave toward the object side and an image-side surface concave toward the image side,
The third lens has a meniscus shape in which the object side surface and the image side surface are convex toward the image side with respect to the optical axis,
The fourth lens has a meniscus shape in which the object side surface and the image side surface are convex toward the image side with respect to the optical axis,
A camera module that further satisfies the following conditional expressions 4 to 5.
(Conditional Expression 4) 0.8<f1/F<1.2
(Conditional Expression 5) ØØ
Here, f1 is the effective focal length of the first lens, F is the total effective focal length of the optical system, Ø is the refractive power of the fourth lens, and Ø is the refractive power of the first lens.

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