CN113287049A

CN113287049A - Image capture lens

Info

Publication number: CN113287049A
Application number: CN202080008377.5A
Authority: CN
Inventors: 权德根
Original assignee: LG Innotek Co Ltd
Current assignee: LG Innotek Co Ltd
Priority date: 2019-01-07
Filing date: 2020-01-07
Publication date: 2021-08-20
Also published as: KR20200085674A; TW202041910A; TWI824096B

Abstract

The present exemplary embodiment relates to an image capturing lens system, which includes: a first lens group including at least one solid lens; a second lens group disposed apart from the first lens group and including at least one solid lens; and a variable focal length lens disposed between the first lens group and the second lens group, wherein conditional equation 1< THlg1/THlg2<2 is satisfied.

Description

Image capture lens

Technical Field

The present exemplary embodiment relates to an imaging lens.

Background

Recently, as for an image pickup system, camera modules for communication terminals, Digital Still Cameras (DSCs), camcorders, and PC cameras (imaging devices attached to personal computers) have been studied. One of the most important components for a camera module associated with such an image pickup system to acquire an image is an imaging lens that forms an image.

Portable terminals, such as mobile phones or vehicle cameras, are becoming smaller and/or lighter. According to this trend, the imaging lens also becomes miniaturized. Further, in addition to miniaturization of the imaging lens, the performance of the imaging lens is also required to cope with the high performance of the light receiving lens.

The related art imaging lens performs an Auto Focus (AF) function and an Optical Image Stabilization (OIS) function by a voice coil motor type lens driving apparatus. Therefore, there are the following problems: it is difficult to reduce the size of the entire camera module.

Disclosure of Invention

Technical problem

The present exemplary embodiment is intended to provide an imaging lens including a liquid lens.

Further, the present invention is intended to provide a camera module having a reduced size compared to a camera module including a voice coil motor type lens driving device by the imaging lens according to the present exemplary embodiment.

Technical solution

The imaging lens system according to the present exemplary embodiment includes: a first lens group including at least one solid lens; a second lens group spaced apart from the first lens group and including at least one solid lens; and a variable focal lens disposed between the first lens group and the second lens group, wherein the following conditional expression 1 may be satisfied.

[ conditional expression 1]

1<THlg1/THlg2<2

(THlg 1 in conditional expression 1 means the thickness of the first lens group on the optical axis, THlg2 means the thickness of the second lens group on the optical axis.)

The number of solid lenses of the first lens group may be greater than the number of solid lenses of the second lens group.

The lens closest to the object side in the first lens group may have a positive refractive power, and the lens closest to the image side in the second lens group may have a negative refractive power.

The first lens group may include a first lens having a positive refractive power, a second lens, and a third lens, and the second lens group may include a fourth lens having a positive refractive power and a fifth lens having a negative refractive power.

The imaging lens system may satisfy the following conditional expression 2.

[ conditional expression 2]

|L2R2|<|L2R1|

(in conditional expression 2, L2R2 refers to the radius of curvature of the image-side surface of the second lens, and L2R1 refers to the radius of curvature of the object-side surface of the second lens.)

The imaging lens system may satisfy the following conditional expression 3.

[ conditional expression 3]

G2>G1

(in conditional expression 3, G1 denotes a refractive index of a material of the first lens, and G2 denotes a refractive index of a material of the second lens.)

The imaging lens system according to the present exemplary embodiment includes: a first lens having a positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, wherein the first lens to the sixth lens are arranged in order from the object side to the image side, the first lens to the third lens and the fifth lens and the sixth lens are solid lenses, and the fourth lens includes a variable-focus lens, wherein the following conditional expression 4 may be satisfied.

[ Condition expression 4]

|L2R2|<|L2R1|

(in conditional expression 4, L2R2 denotes a radius of curvature of the image-side surface of the second lens, and L2R1 denotes a radius of curvature of the object-side surface of the second lens.)

The imaging lens system according to the present exemplary embodiment may include: a first lens group including at least one solid lens; a second lens group spaced apart from the first lens group and including at least one solid lens; and a variable focal lens disposed between the first lens group and the second lens group, wherein the following conditional expression 5 may be satisfied.

[ conditional expression 5]

0.1<THlg1/TTL<0.5

(in conditional expression 5, THlg1 denotes a thickness of the first lens group on the optical axis, and TTL denotes a distance on the optical axis from an object-side surface of the first lens to an imaging surface.)

The imaging lens system according to the present exemplary embodiment includes: a first lens group including at least one solid lens; a second lens group spaced apart from the first lens group and including at least one solid lens; and a variable focal lens disposed between the first lens group and the second lens group, wherein the following conditional expression 6 may be satisfied.

[ conditional expression 6]

0<Fg1/|Fg2|<0.5

(in conditional expression 6, Fg1 refers to the focal length of the first lens group, and Fg2 refers to the focal length of the second lens group.)

The camera module according to the present exemplary embodiment may include: an image sensor; the imaging lens system of claim 1; and a filter disposed between the image sensor and the imaging lens.

An imaging lens for achieving the above object according to an aspect of the present invention, which is disposed in order from an object side to an image side, includes: a first lens having a positive refractive power; a second lens having negative refractive power; a third lens; a fourth lens including first to fifth lens surfaces and having a variable refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, wherein a third lens surface of the fourth lens becomes convex toward the image side when a voltage is applied.

In addition, a radius of curvature of an object-side surface of the third lens may be smaller than a radius of curvature of an image-side surface, and a radius of curvature of an object-side surface of the fifth lens may be larger than the radius of curvature of the image-side surface.

In addition, a first liquid may be disposed between the second lens surface and the third lens surface, and a second liquid may be disposed between the third lens surface and the fourth lens surface.

In addition, the first liquid may be a non-conductive liquid and the second liquid may be a conductive liquid.

In addition, the refractive power of the fourth lens may change from negative to positive.

In addition, the refractive power of the fourth lens may vary from-50 diopters to 1000 diopters.

In addition, the refractive power of the fourth lens may be changed from 0 to positive.

In addition, the refractive power of the fourth lens may be varied within a positive range.

In addition, the diameter of the second lens surface may be smaller than the diameter of the fourth lens surface.

The ratio of the diameter of the fourth lens surface to the diameter of the second lens surface may be greater than 1.1 and less than 1.6.

Additionally, the refractive index of the first lens may be between 1.5 and 1.7.

In addition, the object-side surface of the first lens may be convex toward the object side.

In addition, when a voltage is applied, the diameter of the third lens surface of the fourth lens may become smaller.

In addition, the diameter may gradually increase as it travels from the second lens to the sixth lens.

In addition, at least a part of an image-side surface of the third lens may be convex toward the image-side direction.

In addition, a distance between the third lens and the fourth lens may be shorter than a distance between the fourth lens and the fifth lens.

In addition, a partial region of the object-side surface of the fifth lens may be located at the image side with respect to the central region, and the end region may be closer to the object side than the central region.

In addition, a central region of the object-side surface of the fifth lens may be convex toward the object side, and a partial region may be concave toward the image side.

In addition, a central region of the object-side surface of the sixth lens may be convex toward the object side.

In addition, the object-side surface and the image-side surface of the sixth lens may have at least one inflection point.

In addition, the first lens may have a positive refractive power, the second lens may have a negative refractive power, the fifth lens may have a positive refractive power, and the sixth lens may have a negative refractive power.

In addition, a distance between an image-side surface of the third lens and an object-side surface of the fifth lens may be greater than 0.5 mm.

In addition, a ratio of a distance between an image-side surface of the third lens and an object-side surface of the fifth lens to a distance between the object-side surface of the first lens and the image sensor may be greater than 0.1.

In addition, a ratio of a distance between an image-side surface of the third lens and an object-side surface of the fifth lens to twice an image height may be greater than 0.1.

In addition, a ratio of the total focal length to a distance between the object-side surface of the first lens and the image sensor may be between 0.5 and 1.

In addition, a ratio of a distance between the object-side surface of the first lens and the image sensor to twice the image height may be between 0.5 and 1.5.

In addition, a ratio of a radius of an image-side surface of the second lens to a radius of an object-side surface of the third lens may be less than 1.

Additionally, the inverse of the focal length of the fourth lens may be between-0.05 and 0.1.

In addition, SAG at 80% of the effective diameter of the fifth lens may be greater than zero.

In addition, the imaging lens may include an aperture disposed between the first lens and the second lens.

An imaging lens for achieving the above object according to an aspect of the present invention, which is disposed in order from an object side to an image side, includes: a first lens; a second lens; a third lens; a fourth lens including first to fifth lens surfaces and having a variable refractive power; a fifth lens; and a sixth lens, wherein a radius of curvature of the fourth lens decreases when a voltage is applied.

An imaging lens for achieving the above object according to an aspect of the present invention, which is disposed in order from an object side to an image side, includes: a first lens; a second lens; a third lens; a fourth lens including first to fifth lens surfaces and having a variable refractive power; a fifth lens in which a part of the object-side surface is located at the image side with respect to the central region, and the end region is closer to the object side than the central region; and a sixth lens.

Advantageous effects

By the present exemplary embodiment, an imaging lens that can perform AF or OIS using a liquid lens can be provided.

Drawings

Fig. 1 is a configuration diagram of an imaging lens according to a first exemplary embodiment of the present invention.

Fig. 2 is a configuration diagram of an imaging lens according to a second exemplary embodiment of the present invention.

Fig. 3 is a configuration diagram of an imaging lens according to a third exemplary embodiment of the present invention.

Fig. 4 and 5 are cross-sectional views of a fourth lens of the imaging lens according to the present exemplary embodiment.

Fig. 6 is a conceptual diagram of a diagonal field of view (DFOV) of the imaging lens according to the present exemplary embodiment.

Fig. 7 is an exploded perspective view of a camera module according to the present exemplary embodiment.

Detailed Description

Hereinafter, preferred exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to the described some exemplary embodiments, but may be implemented in various forms, and one or more components may be combined and substituted between the exemplary embodiments within the technical idea of the present invention.

In addition, unless explicitly defined and described, terms (including technical and scientific terms) used in exemplary embodiments of the present invention may be those commonly understood by one of ordinary skill in the art to which the present invention belongs. Commonly used terms such as those defined in dictionaries can be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the exemplary embodiments of the present invention are used for describing the exemplary embodiments and are not intended to limit the present invention.

In this specification, unless the context specifically indicates otherwise, the singular form may also include the plural form, and when describing "at least one (or one or more) of A, B and C", the singular form may include one or more of any combination of A, B and C.

In describing the components of the exemplary embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish one element from another, and do not limit the nature, order, or sequence of the elements.

When an element is described as being "connected," "coupled," or "engaged" to another element, it includes not only the case where it is directly "connected," "coupled," or "engaged" to another element, but also the case where it is "connected," "coupled," or "engaged" to another element because another element is also present between the element and the other element.

In addition, when an element is described as being formed or disposed "on top (above) or bottom (below)" of each element, the top (above) or bottom (below) includes not only a case where two elements are in direct contact with each other but also a case where one or more other elements are formed or disposed between the two elements. In addition, when it is stated as "top (upper) or bottom (lower)", not only the meaning of the upward direction with respect to one member but also the meaning of the downward direction with respect to one member may be included.

In the following description of the configuration of each lens, "object side surface" refers to a surface of the lens facing the object, and "image side surface" refers to a surface of the lens facing the image plane.

The unit of length, distance, radius of curvature, thickness, etc., used hereinafter may be mm.

Hereinafter, the configuration of an imaging lens according to a first embodiment of the present invention will be described with reference to the drawings.

The imaging lens according to the first embodiment of the present invention may include a plurality of lenses. The imaging lens may include six lenses. The imaging lens may include a first lens 100, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, a sixth lens 600, and an aperture STOP (aperture STOP). However, in the imaging lens according to the first embodiment, one or more of the first lens 100, the second lens 200, the third lens 300, the fourth lens 400, the fifth lens 500, the sixth lens 600, and the aperture stop may be omitted. The imaging lens may be provided with a first lens 100, an aperture stop, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, and a sixth lens 600 in this order from the object side to the image side. The imaging lens according to the first embodiment may be constituted by up to five lenses. Alternatively, the imaging lens according to the first embodiment may be constituted by seven or more lenses.

In another exemplary embodiment, one or more of another lens, a flat plate, and an optical member may be added between the first to sixth lenses 100 to 600. In addition, at least one of another lens, a flat plate, and an optical member may be added in front of the first lens 100 or behind the sixth lens 600. In addition, any one or more of another lens, a flat plate, and an optical member may be added between the aperture stop and the lens, between the lens and the optical filter 700, and between the optical filter 700 and the image sensor 800. At this time, the filter 700 may be a flat lens. The refractive power of the flat lens may be '0'. A flat lens may have no refractive power. In addition, filter layers may be provided between the aperture stop and the lens, between the lens and the filter 700, and between the filter 700 and the image sensor 800. In this case, the filter layer may be coated to become a filter.

The imaging lens may include a first lens 100. The first lens 100 may be closest to the object side. The first lens 100 may be a lens disposed first from the object side. The first lens 100 may be a lens first adjacent to the object side. A lens may be additionally disposed between the first lens 100 and the second lens 200. The second to

fifth lenses

200, 300, 400 and 500 may be disposed between the first lens 100 and the sixth lens 600. Lenses other than the second to

fifth lenses

200, 300, 400, and 500 may be additionally disposed between the first lens 100 and the sixth lens 600. A lens may be additionally disposed between at least two of the first to

sixth lenses

100, 200, 300, 400, 500, and 600.

The first lens 100 may have a positive refractive power. Both surfaces of the first lens 100 may be formed to be convex. Both surfaces of the first lens 100 may be formed to be convex on the optical axis. The object-side surface of the first lens 100 may be formed to be convex. The object-side surface of the first lens 100 may be formed convex on the optical axis. The first lens 100 may include an object-side surface having a convex shape. The first lens 100 may include an object-side surface having a convex shape on an optical axis. The image-side surface of the first lens 100 may be formed to be convex. The image-side surface of the first lens 100 may be formed convex on the optical axis. The first lens 100 may include an image side surface having a convex shape. The first lens 100 may include an image side surface having a convex shape on an optical axis. The object-side surface or the image-side surface of the first lens 100 may include at least one inflection point. The image-side surface of the first lens 100 may be concave toward the object side as it proceeds from the central portion to the peripheral portion side. The image side surface of the first lens 100 may protrude toward the image side as it travels from the peripheral portion toward the outermost area.

The radius of curvature of the object-side surface of the first lens 100 may be positive. The radius of curvature at the optical axis of the object-side surface of the first lens 100 may be positive. The radius of curvature of the image-side surface of the first lens 100 may be negative. The radius of curvature of the image-side surface of the first lens 100 in the optical axis may be negative. The absolute value of the radius of curvature of the object-side surface of the first lens 100 may be greater than the absolute value of the radius of curvature of the image-side surface of the first lens 100. The first lens 100 may be a solid lens.

Both surfaces of the first lens 100 may be formed as spherical surfaces. Both surfaces of the first lens 100 may be formed as aspherical surfaces. Either one of the two surfaces of the first lens 100 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

The first lens 100 may be formed of a material having a refractive index. The first lens 100 may be formed of a material having a lower refractive index than the second lens 200. The first lens 100 may be formed of a material having a higher refractive index than the third lens 300. The first lens 100 may be formed of a material having a higher refractive index than the fifth lens 500. The first lens 100 may be formed of a material having a higher refractive index than the sixth lens 600.

The first lens 100 may satisfy the range of 1.5< N1< 1.7. In addition, the first lens 100 may satisfy the range of 1.53< N1< 1.65. N1 is the refractive index of the first lens 100. The first lens 100 may satisfy the range of 20< V1< 60. In addition, the first lens 100 may satisfy 22< V1< 58. V1 is the Abbe number (Abbe #) of the first lens 100.

The imaging lens may include a second lens 200. The second lens 200 may be a lens disposed second from the object side. The second lens 200 may be a lens second adjacent to the object side. The second lens 200 may be disposed between the first lens 100 and the image side. The second lens 200 is disposed at the image side compared to the aperture stop. The second lens 200 may be disposed between the first lens 100 and the third lens 300. A lens may be additionally disposed between the second lens 200 and the first lens 100 or between the second lens 200 and the third lens 300.

The second lens 200 may have a negative refractive power. The object-side surface of the second lens 200 may be formed in a convex shape. The object-side surface of the second lens 200 may be formed to be convex on the optical axis. The second lens 200 may include an object-side surface having a convex shape. The second lens 200 may include an object-side surface having a convex shape on an optical axis. The image-side surface of the second lens 200 may be formed in a concave shape. The image-side surface of the second lens 200 may be formed in a concave shape on the optical axis. The second lens 200 may include an image side surface having a concave shape. The second lens 200 may include an image side surface having a concave shape on an optical axis. The second lens 200 may be formed in a meniscus shape with the object side surface having a convex shape. The second lens 200 may be formed in a meniscus shape with the object-side surface being convex on the optical axis. The object-side surface or the image-side surface of the second lens 200 may include at least one inflection point. The object-side surface of the second lens 200 may be concave toward the image side as it goes from the central portion toward the peripheral portion side. The object-side surface of the second lens 200 may protrude toward the object side as it travels from the peripheral portion side toward the outermost region side. The diameter of the second lens 200 may be smaller than the diameter of the first lens 100. The thickness of the second lens 200 may be smaller than that of the first lens 100. Based on the optical axis C, the distance between the second lens 200 and the first lens 100 may be shorter than the distance between the second lens 200 and the third lens 300.

The radius of curvature of the object-side surface of the second lens 200 may be positive. The radius of curvature on the optical axis of the object-side surface of the second lens 200 may be positive. The radius of curvature of the image-side surface of the second lens 200 may be positive. The radius of curvature of the image-side surface of the second lens 200 on the optical axis may be positive. The radius of curvature of the object-side surface of the second lens 200 may be larger than the radius of curvature of the image-side surface of the second lens 200. The second lens 200 may be a solid lens.

Both surfaces of the second lens 200 may be formed as spherical surfaces. Both surfaces of the second lens 200 may be formed as aspherical surfaces. One surface of the two surfaces of the second lens 200 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

The second lens 200 may be formed of a material having a refractive index. The second lens 200 may be formed of a material having a higher refractive index than the first lens 100. The second lens 200 may be formed of a material having a higher refractive index than the third lens 300. The second lens 200 may be formed of a material having a higher refractive index than the fifth lens 500. The second lens 200 may be formed of a material having a higher refractive index than the sixth lens 600.

The second lens 200 may satisfy the range of 1.6< N2< 1.7. In addition, the second lens 200 may satisfy the range of 1.64< N2< 1.68. N2 is the refractive index of the second lens 200. The second lens 200 may satisfy the range of 15< V2< 25. In addition, the second lens 200 may satisfy a range of 17< V2< 20. V2 is the Abbe number (Abbe #) of the second lens 200.

The imaging lens may include a third lens 300. The third lens 300 may be a lens disposed third from the object side. The third lens 300 may be a lens third adjacent to the object side. The third lens 300 may be disposed between the second lens 200 and the image side. The third lens 300 may be disposed between the third lens 300 and the fourth lens 400. The third lens 300 may be disposed between the second lens 200 and the fourth lens 400. A lens may be additionally disposed between the third lens 300 and the second lens 200 or between the third lens 300 and the fourth lens 400.

The third lens 300 may have a positive refractive power. Both surfaces of the third lens 300 may be formed to be convex. Both surfaces of the third lens 300 may be formed to be convex on the optical axis. The object-side surface of the third lens 300 may be formed to be convex. The third lens 300 may have a convex object-side surface on the optical axis. The third lens 300 may include an object-side surface having a convex shape. The third lens 300 may include an object-side surface having a convex shape on an optical axis. The image-side surface of the third lens 300 may be formed to be convex. The image-side surface of the third lens 300 may be formed convex on the optical axis. The third lens 300 may include an image side surface having a convex shape. The third lens 300 may include an image side surface having a convex shape on an optical axis. At least a portion of the image-side surface of the third lens 300 may include a surface convex in the image-side direction. The object-side surface or the image-side surface of the third lens 300 may include at least one inflection point. The object-side surface of the third lens 300 may protrude toward the image side as it travels from the central portion toward the peripheral portion side. The image-side surface of the third lens 300 may be formed to become more planar as it travels from the peripheral portion side toward the outermost region side. The diameter of the third lens 300 may be formed to have a size corresponding to the diameter of the first lens 100. The thickness of the third lens 300 may be formed in a size corresponding to the thickness of the first lens 100. The diameter of the third lens 300 may be smaller than that of the fourth lens 400. The thickness of the third lens 300 may be less than that of the fourth lens 400. Based on the optical axis C, the distance between the third lens 300 and the second lens 200 may be shorter than the distance between the third lens 300 and the fourth lens 400.

The radius of curvature of the third lens 300 on the object-side surface may be positive. The radius of curvature of the object-side surface of the third lens 300 on the optical axis may be positive. The radius of curvature of the image-side surface of the third lens 300 may be negative. The radius of curvature of the image-side surface of the third lens 300 on the optical axis may be negative. An absolute value of a radius of curvature of the object-side surface of the third lens 300 may be smaller than an absolute value of a radius of curvature of the image-side surface of the third lens 300. The third lens 300 may be a solid lens.

Both surfaces of the third lens 300 may be formed as spherical surfaces. Both surfaces of the third lens 300 may be formed as aspherical surfaces. One surface of the two surfaces of the third lens 300 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

The third lens 300 may be formed of a material having a refractive index. The third lens 300 may be formed of a material having a lower refractive index than the first lens 100. The third lens 300 may be formed of a material having a lower refractive index than the second lens 200. The third lens 300 may be formed of the same material having the same refractive index as the fifth lens 500. The third lens 300 may be formed of a material having a higher refractive index than the sixth lens 600.

The third lens 300 may satisfy the range of 1.5< N3< 1.6. In addition, the third lens 300 may satisfy the range of 1.52< N3< 1.58. N3 is the refractive index of the third lens 300. The third lens 300 may satisfy the range of 50< V3< 60. In addition, the third lens 300 may satisfy a range of 52< V3< 58. V3 is the Abbe number (Abbe #) of the third lens 300.

The imaging lens may include a fourth lens 400. The fourth lens 400 may be a lens disposed fourth from the object side. The fourth lens 400 may be a lens fourth adjacent to the object side. The fourth lens 400 may be a lens disposed third from the image side. The fourth lens 400 may be a lens third adjacent to the image side. The fourth lens 400 may be disposed between the third lens 300 and the image side. The fourth lens 400 may be disposed between the third lens 300 and the fifth lens 500. A lens may be additionally disposed between the fourth lens 400 and the third lens 300 or between the fourth lens 400 and the fifth lens 500.

The diameter of the fourth lens 400 may be larger than the diameters of the first to

third lenses

100, 200, 300. Based on the optical axis C, a distance between the fourth lens 400 and the third lens 300 may be shorter than a distance between the fourth lens 400 and the fifth lens 500. The inverse of the focal length of the fourth lens 400 may be between-0.05 and 0.1.

The fourth lens 400 may comprise a variable focus lens. The variable focus lens may comprise a variable lens surface. The fourth lens 400 may include first to fifth lens surfaces 7, 8, 9, 10, and 11. The variable focus lens may comprise a liquid lens. The fourth lens 400 may include a liquid lens. The liquid lens may be a liquid lens comprising two liquids. A liquid lens comprising two liquids may comprise a conductive liquid and a non-conductive liquid. In this case, the focal point can be changed by adjusting the interface formed between the conductive liquid and the non-conductive liquid using a voltage applied to the liquid lens. A liquid lens may be disposed between the third lens 300 and the fifth lens 500. The liquid lens may be disposed between the solid lenses. The liquid lens may be spaced apart from the solid lens. The liquid lens may be a variable lens. The liquid lens may be an auto-focus lens.

The liquid lens may include a first liquid 420. The first liquid 420 may be disposed between the second plate 410 and the third plate 440. The first liquid 420 may have electrical conductivity. The first liquid 420 may be in contact with the second liquid 430. The image-side surface of the first liquid 420 may be in contact with the object-side surface of the second liquid 430. The liquid lens may comprise a second liquid 430. The second liquid 430 may be disposed between the second plate 410 and the third plate 440. The second liquid 430 may be non-conductive. As a modified example, the first liquid 420 may be non-conductive and the second liquid 430 may be conductive.

The liquid lens may include an interface surface. The interface surface may be formed by contacting the first liquid 420 and the second liquid 430. The interface surface may be formed by contacting the image side of the first liquid 420 and the object side of the second liquid 430. The interface surface may be a refractive surface. The curvature of the interface surface may vary depending on the applied voltage.

As a modified example, the liquid lens may be a liquid lens containing one liquid. A liquid lens comprising a liquid can change the focal length by adjusting a membrane arranged at a position corresponding to the liquid. For example, the focal length can be changed by pressing the film by the electromagnetic force of the magnet and the coil. Alternatively, the liquid lens may be a liquid lens including three or more types of liquids.

The liquid lens may include a first plate including a cavity in which a conductive liquid and a non-conductive liquid are disposed. The liquid lens may include an electrode disposed on the first plate. The liquid lens, whose focal length is adjusted in response to the driving voltage, may receive the operating voltage through the electrodes. The electrodes of the liquid lens may include individual electrodes and a common electrode. One common electrode may be provided, or a plurality of individual electrodes may be provided. For example, the individual electrodes may comprise four or eight individual electrodes of the liquid lens. The individual electrodes may be disposed on the first surface of the first plate. The common electrode may be disposed on the second surface of the first plate. The common electrode may be disposed on a second surface opposite to the first surface of the liquid lens. When an operating voltage is applied through the individual electrodes and the common electrode, an interface between the conductive liquid and the non-conductive liquid disposed in the lens region may be deformed.

One side of the liquid lens may receive a voltage from a separate electrode. The other side of the liquid lens may receive a voltage from the common electrode. In this way, any one or more of the AF and OIS functions may be performed.

The fourth lens 400 may include a second plate 410. The second plate may be disposed on one side of the first plate 415. The second plate 410 may be spaced apart from the third plate 440. A third plate 440 may be disposed on the other side of the first plate 415. The first plate 415 may be disposed between the second plate 410 and the third plate 440. The second plate 410 may be spaced apart from the third plate 440 in the optical axis direction. The second plate 410 may be disposed closer to the object side than the third plate 440. The second plate 410 may cover the object-side surface of the first liquid 420. The second plate 410 may be formed of a flat plate. The refractive power of the second plate 410 may be '0'. The second plate 410 may contact the first liquid 420. A distance between the second plate 410 and the third lens 300 on the optical axis may be smaller than a distance between the third plate 440 and the fifth lens 500 on the optical axis. The length of the second plate 410 in a direction perpendicular to the optical axis may correspond to the length of the third plate 440 in a corresponding direction.

The fourth lens 400 may include a third plate 440. The third plate 440 may be spaced apart from the second plate 410. The third plate 440 may be spaced apart from the second plate 410 in the optical axis direction. The third plate 440 may be disposed closer to the image side than the second plate 410. The third plate 440 may cover an image-side surface of the second liquid 430. The third plate 440 may be formed of a flat plate. The refractive power of the third plate 440 may be '0'. The third plate 440 may contact the second liquid 430. The length of the third plate 440 in a direction perpendicular to the optical axis may correspond to the length of the second plate 410 in the corresponding direction.

The liquid lens may include a first liquid 420. The first liquid 420 may be disposed between the second plate 410 and the third plate 440. Additionally, the first liquid 420 may be arranged between the second lens surface 8 and the third lens surface 9. The first liquid 420 may have electrical conductivity.

The liquid lens may comprise a second liquid 430. The second liquid 430 may be disposed between the second plate 410 and the third plate 440. In addition, the second liquid 430 may be arranged between the third lens surface 9 and the fourth lens surface 10. The second liquid 430 may be non-conductive.

When a voltage is applied, the third lens surface 9 of the fourth lens 400 may be convex in the image side direction. The second lens surface 8 of the fourth lens 400 may have a smaller diameter or radius of curvature when a voltage is applied. Thus, the fourth lens 400 may have a variable refractive power. For example, the refractive power of the fourth lens 400 may change from negative to positive. In this case, the refractive power of the fourth lens 400 may be varied within a range of-50 diopters to 1000 diopters. Alternatively, the fourth lens 400 may change from 0 to positive or vary within a positive range.

The diameter of the second lens surface 8 of the fourth lens 400 may be smaller than the diameter of the fourth lens surface 10. At this time, the ratio of the diameter of the fourth lens surface 10 to the diameter of the second lens surface 8 may be between 1.1 and 1.6. Thus, the light passing through the fourth lens 400 may be effectively received by the image sensor 800.

Hereinafter, the liquid lens will be described with reference to a cross-sectional view of the fourth lens 400 of the imaging lens according to the present exemplary embodiment.

Fig. 4 and 5 are cross-sectional views of a fourth lens 400 of the imaging lens according to the present exemplary embodiment.

The fourth lens 400 may be a liquid lens 400. The liquid lens 400 may include a first liquid 420, a second liquid 430, a first plate 415, a first electrode 425, and a second electrode 435. The first liquid 420 may comprise a non-conductive liquid. For example, the first liquid 420 may be oil. The second liquid 430 may comprise a conductive liquid. For example, the second liquid 430 may be water.

The first plate 415 may comprise a cavity in which the first liquid 420 and the second liquid 430 are disposed.

Electrodes

425 and 435 may be disposed above or below the first plate 415. For example, the first electrode 425 may be disposed below the first plate 415, and the second electrode 435 may be disposed above the first plate 415. The second plate 410 and/or the third plate 440 may be disposed above or below the first plate 415. For example, the third plate 440 may be disposed below the second electrode 435, the second plate 410 may be disposed above the first electrode 425, the second plate 410 may be disposed on the first electrode 425, and at least one of the second plate 410 and the third plate 440 may be omitted.

The first plate 415 may be disposed between the second plate 410 and the third plate 440, and the first plate 415 may include an upper opening and a lower opening having a predetermined inclined surface (e.g., an inclined surface having an angle of about 55 to 65 degrees or 50 to 70 degrees). The region surrounded by the above-described inclined surface, the first opening contacting the second plate 410, and the second opening adjacent to the third plate 440 may be referred to as a 'cavity'.

Here, the size of the opening may represent a cross-sectional area in a horizontal direction, or if the cross-section of the opening is circular, the size of the opening may represent a radius, and if the cross-section is square, the size of the opening may represent a length of a diagonal line.

The first plate 415 is a structure for containing the first liquid 420 and the second liquid 430. Since the second plate 410 and the third plate 440 include regions through which light passes, the second plate 410 and the third plate 440 may be made of a light-transmissive material, such as glass; and the second plate 410 and the third plate 440 may be formed of the same material for easy handling.

In addition, the first plate 415 may be made of a transparent material, or the first plate 415 may contain impurities so that light is not easily transmitted.

The second plate 410 is configured to be incident when light incident from the third lens 300 travels into the cavity, and the third plate 440 is configured to pass light having passed through the cavity to the fifth lens 500.

The above-described cavities may be filled with a first liquid 420 and a second liquid 430 having different properties, and an interface surface may be formed between the first liquid 420 and the second liquid 430. The interface surface formed by the first liquid 420 and the second liquid 430 may vary in curvature, inclination, and the like.

The first electrode 425 may be disposed in a portion of the lower surface of the first plate 415 and may directly contact the first liquid 420. The second electrode 435 may be spaced apart from the first electrode 425 and may be disposed on the upper surface, the side surface, and the lower surface of the first plate 415.

The inside surface of the first plate 415 may form a sidewall i of the cavity. An insulating layer 450 may be disposed between the first liquid 420 and the first electrode 425 or between the second liquid 430 and the first electrode 425. A portion of the second liquid 430 and a portion of the second electrode 435 may be in contact with each other. The first electrode 425 and the second electrode 435 may be applied with an electrical signal received from an external circuit board to control the interface surface between the first liquid 420 and the second liquid 430.

The first electrode 425 and the second electrode 435 may be made of a conductive material, such as a metal.

The insulating layer 450 may be disposed to cover a portion of the lower surface of the second plate 410 and a portion of the first electrode 425 forming a sidewall of the cavity in an upper region of the cavity. In addition, an insulating layer 450 may be disposed on a lower surface of the first plate 415 to cover a portion of the first electrode 425, the first plate 415, and the second electrode 435.

As shown, an insulating layer 450 may be disposed between the first liquid 420 and the second plate 410. The second liquid 430 may be in direct contact with the third plate 440.

The edges of the second plate 410 and the third plate 440 may be rectangular, but are not limited thereto.

The first electrode 425 may be exposed in at least one region of the periphery of the second plate 410, and the second electrode 435 may be exposed in at least one region of the edge of the third plate 440.

Also, a first contact electrode 426 is provided on the first electrode 425 in an outer region of the second plate 410, and a second contact electrode 436 is provided on the second electrode 435 in an outer region of the third plate 400. The first contact electrode 426 and the second contact electrode 436 may be a part of a connection substrate.

Although not shown, a conductive epoxy may be disposed between the first electrode 425 and the first contact electrode 426, and a conductive epoxy may be disposed between the second electrode 435 and the second contact electrode 436. In addition, the first contact electrode 426 and the second contact electrode 436 may be integrally provided with the first electrode 425 and the second electrode 435, respectively.

Therefore, in the imaging lens including the liquid lens 400 according to an exemplary embodiment of the present invention, a distance from the object-side surface of the first lens 100 to the image-side surface of the sixth lens 600 is fixed, and a focal length, diopter, or the like of the liquid lens 400 may be varied. That is, the autofocus AF can be performed without moving the

lenses

100, 200, 300, 400, 500, 600 inside the imaging lens.

The imaging lens may include a fifth lens 500. The fifth lens 500 may be a lens disposed second from the image side. The fifth lens 500 may be a second adjacent lens to the image side. The fifth lens 500 may be disposed between the fourth lens 400 and the image side. The fifth lens 500 may be disposed between the fourth lens 400 and the sixth lens 600. A lens may be additionally disposed between the fifth lens 500 and the fourth lens 400 or between the fifth lens 500 and the sixth lens 600.

The fifth lens 500 may have a positive refractive power or a negative refractive power. The object-side surface of the fifth lens 500 may be formed in a concave shape. A central region of the object-side surface of the fifth lens 500 adjacent to the optical axis C may be formed in a convex shape toward the object side. An end region of the object-side surface of the fifth lens 500, which is most spaced apart from the optical axis C, may be closer to the object side than the central region. At least a part of a portion connecting the central region and the end region of the object-side surface of the fifth lens 500 may be positioned closer to the image side than the central region. A portion connecting the central region and the end region of the object-side surface of the fifth lens 500 may be formed concave toward the image side. The image-side surface of the fifth lens 500 may be formed convex toward the image side. Alternatively, the object-side surface of the fifth lens 500 may be formed to be concave on the optical axis. The fifth lens 500 may include an object-side surface having a concave shape. The fifth lens 500 may include an object-side surface having a concave shape on an optical axis. The image-side surface of the fifth lens 500 may be formed to be convex. An image-side surface of the fifth lens 500 may be formed convex on the optical axis. The fifth lens 500 may include an image side surface having a convex shape. The fifth lens 500 may include an image side surface having a convex shape on an optical axis. The fifth lens 500 may be formed in a meniscus shape whose image side surface is convex. The fifth lens 500 may be formed in a meniscus shape in which an image side surface is convex on an optical axis. The object-side surface or the image-side surface of the fifth lens 500 may include at least one inflection point. The object-side surface of the fifth lens 500 may be more recessed toward the image side as it travels from the central portion toward the peripheral portion side. The object-side surface of the fifth lens 500 may protrude more toward the object side as it travels from the peripheral portion toward the outermost region. The object-side surface of the fifth lens 500 may become more planar as it travels from the peripheral portion toward the outermost region side. The image-side surface of the fifth lens 500 may be more recessed toward the object side as it travels from the central portion toward the peripheral side. The image-side surface of the fifth lens 500 may protrude more toward the image side as it goes from the peripheral portion toward the outermost area. The diameter of the fifth lens 500 may be larger than that of the fourth lens 400. The thickness of the fifth lens 500 may be greater than that of the fourth lens 400. Based on the optical axis C, a distance between the fifth lens 500 and the fourth lens 400 may be longer than a distance between the fifth lens 500 and the sixth lens 600.

The radius of curvature of the object-side surface of the fifth lens 500 may be negative. The radius of curvature of the object-side surface of the fifth lens 500 may be negative on the optical axis. The radius of curvature of the image-side surface of the fifth lens 500 may be negative. The radius of curvature of the image-side surface of the fifth lens 500 may be negative on the optical axis. An absolute value of a radius of curvature of the object-side surface of the fifth lens 500 may be greater than an absolute value of a radius of curvature of the image-side surface of the fifth lens 500. The fifth lens 500 may be a solid lens.

Both surfaces of the fifth lens 500 may be formed as spherical surfaces. Both surfaces of the fifth lens 500 may be formed as aspherical surfaces. One surface of the two surfaces of the fifth lens 500 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface.

The fifth lens 500 may be formed of a material having a refractive index. The fifth lens 500 may be formed of a material having a lower refractive index than the first lens 100. The fifth lens 500 may be formed of a material having a lower refractive index than the second lens 200. The fifth lens 500 may be formed of the same material having the same refractive index as the third lens 300. The fifth lens 500 may be formed of a material having a higher refractive index than the sixth lens 600.

The fifth lens 500 may satisfy the range of 1.5< N5< 1.6. Further, the fifth lens 500 may satisfy the range of 1.52< N5< 1.58. N5 is the refractive index of the fifth lens 500. The fifth lens 500 may satisfy the range of 50< V5< 60. In addition, the fifth lens 500 may satisfy a range of 52< V5< 58. V5 is the Abbe number (Abbe #) of the fifth lens 500.

The SAG at 80% of the effective diameter of the fifth lens 500 may be greater than zero. When a vertical line as an effective diameter of the fifth lens 500 descends to the optical axis C in the end region, an intersection with the optical axis C is closer to the object side direction than a vertex of the object side surface of the fifth lens 500. When the vertical line descends to the optical axis C at the position P of 80% of the effective diameter of the fifth lens 500, the intersection point with the optical axis C is closer to the image side than the vertex of the object-side surface of the fifth lens 500. Here, the vertex of the object-side surface of the fifth lens 500 refers to an intersection point where the object-side surface of the fifth lens 500 intersects the optical axis C.

The imaging lens may include a sixth lens 600. The sixth lens 600 may be the lens closest to the image side. The sixth lens 600 may be disposed between the fifth lens 500 and the image side. The sixth lens 600 may be disposed between the fifth lens 500 and the filter 700. A lens may be additionally disposed between the sixth lens 600 and the fifth lens 500 or between the sixth lens 600 and the filter 700.

The sixth lens 600 may have a negative refractive power. The object-side surface of the sixth lens 600 may be formed in a convex shape. The object-side surface of the sixth lens 600 may be formed in a convex shape on the optical axis. The sixth lens 600 may include an object-side surface having a convex shape. The sixth lens 600 may include an object-side surface having a convex shape on the optical axis. The image-side surface of the sixth lens 600 may be formed to be concave. An image-side surface of the sixth lens 600 may be formed to be concave on the optical axis. The sixth lens 600 may include a concave image side surface. The sixth lens 600 may include a concave image-side surface on the optical axis. The sixth lens 600 may be formed in a meniscus shape in which the object side surface is convex. The sixth lens 600 may be formed in a meniscus shape in which the object-side surface is convex on the optical axis. The object side surface or the image side surface of the sixth lens 600 may include at least one inflection point. The object-side surface of the sixth lens 600 may be more recessed toward the image side as it travels from the central portion toward the peripheral portion. The object-side surface of the sixth lens 600 may protrude more toward the object side as it travels from the peripheral portion toward the outermost region. The object-side surface of the sixth lens 600 may become more planar as it travels from the peripheral portion toward the outermost region side. The image-side surface of the sixth lens 600 may protrude more toward the image side as it goes from the center to the peripheral side. The image-side surface of the sixth lens 600 may be more recessed toward the object side as it travels from the peripheral portion toward the outermost area. The thickness of the central portion of the sixth lens 600 in the optical axis C direction may be smaller than the thickness of the remaining region in the optical axis C direction. Based on the optical axis C, a distance between the sixth lens 600 and the fifth lens 500 may be shorter than a distance between the sixth lens 600 and the filter 700. The diameter of the sixth lens 600 may be larger than that of the fifth lens 500. The thickness of the sixth lens 600 may be greater than that of the fifth lens 500.

The radius of curvature of the object-side surface of the sixth lens 600 may be positive. The radius of curvature of the object-side surface of the sixth lens 600 may be positive on the optical axis. The radius of curvature of the image-side surface of the sixth lens 600 may be positive. The radius of curvature of the image-side surface of the sixth lens 600 may be positive on the optical axis. A radius of curvature of the object-side surface of the sixth lens 600 may be larger than a radius of curvature of the image-side surface of the sixth lens 600. The sixth lens 600 may be a solid lens.

Both surfaces of the sixth lens 600 may be formed as spherical surfaces. Both surfaces of the sixth lens 600 may be formed as aspherical surfaces. One surface of the two surfaces of the sixth lens 600 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The sixth lens 600 may have a surface including one or more inflection points.

The sixth lens 600 may be formed of a material having a refractive index. The sixth lens 600 may be formed of a material having a lower refractive index than the first lens 100. The sixth lens 600 may be formed of a material having a lower refractive index than the second lens 200. The sixth lens 600 may be formed of a material having a lower refractive index than the third lens 300. The sixth lens 600 may be formed of a material having a lower refractive index than the fifth lens 500.

The sixth lens 600 may satisfy the range of 1.5< N6< 1.7. In addition, the sixth lens 600 may satisfy the range of 1.52< N6< 1.68. N6 is the refractive index of the sixth lens 600. The sixth lens 600 may satisfy the range of 18< V6< 60. In addition, the sixth lens 600 may satisfy the range of 20< V6< 58. V6 is the Abbe number (Abbe #) of the sixth lens 600.

All lens surfaces of the first lens 100, the second lens 200, the third lens 300, the fifth lens 500, and the sixth lens 600 may be spherical surfaces or aspherical surfaces. Each of the first lens 100, the second lens 200, the third lens 300, the fifth lens 500, and the sixth lens 600 may be formed to have spherical surfaces on both surfaces thereof. Each of the first lens 100, the second lens 200, the third lens 300, the fifth lens 500, and the sixth lens 600 may be formed to have an aspherical surface on both surfaces thereof. Any one of two surfaces of each of the first lens 100, the second lens 200, the third lens 300, the fifth lens 500, and the sixth lens 600 may be formed as a spherical surface, and the other surface may be formed as an aspherical surface. The diameter may gradually increase as it travels on the optical axis C from the second lens 200 to the sixth lens 600. The thickness may gradually increase as it travels from the second lens 200 to the sixth lens 600 on the optical axis C.

The imaging lens may include a filter 700. The filter 700 may be disposed closer to the object side than the sixth lens 600. The filter 700 may be at least one of an infrared filter and a cover glass. When the infrared filter is used as the filter 700, radiant heat emitted from external light may be blocked from being transferred to the light receiving device. In addition, the infrared filter transmits visible light and reflects infrared rays to the outside.

The imaging lens may include an image sensor 800. The image sensor 800 may include a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The length of the horizontal length and/or the vertical length of the unit pixel of the image sensor 800 may be 2 μm or less. Thus, an imaging lens applicable to a pixel module and/or a camera module having a high pixel count can be provided.

The imaging lens may include an aperture STOP. The aperture stop may be disposed between the first lens 100 and the second lens 200. The aperture stop may be disposed closer to the first lens 100 than the second lens 200. The aperture stop may be spaced apart from the object side surface of the second lens 200. The aperture stop can adjust the amount of light incident from the object. The aperture stop can adjust the amount of light passing through the first lens 100. The aperture stop can adjust the amount of light incident on the second lens 200. The aperture stop may comprise a circular diameter aperture.

The imaging lens may include a first lens group disposed on a water side with respect to a variable focus lens (e.g., a liquid lens) and a second lens group disposed on an image side with respect to the variable focus lens. Each of the first lens group and the second lens group may include at least one solid lens.

The cavity of the first plate in which the liquid of the liquid lens is disposed may have an inclined surface. Due to the inclined surface, the diameter of the opening of the cavity of the first plate of the liquid lens adjacent to the aperture stop may be smaller than the diameter at the side of the cavity of the first plate remote from the aperture stop.

The imaging lens according to the first exemplary embodiment of the present invention may satisfy the following conditional expressions 1 to 65.

The conditional expressions and exemplary embodiments described below are preferred exemplary embodiments for enhancing the effect of action, and the configuration of the optical device of the present invention can have a synergistic effect by satisfying only some of the conditional expressions described below.

[ conditional expression 1]

1.2<d1/d2<1.8

In conditional expression 1, d1 refers to a distance between the first lens group and the second lens group on the optical axis (e.g., a distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500), and d2 refers to a thickness of the fourth lens 400 on the optical axis. In addition, conditional expression 1 may satisfy the range of 1.4< d1/d2< 1.7.

[ conditional expression 2]

0<Fg1/|Fg2|<0.5

In conditional expression 2, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and Fg2 refers to the combined focal length of the second lens group (e.g., from the fifth lens 500 to the sixth lens 600). In addition, conditional expression 2 may satisfy the range of 0< Fg1/| Fg2| <0.3 |.

[ conditional expression 3]

0.1<d1/TTL<0.4

In conditional expression 3, d1 is a distance between the first lens group and the second lens group on the optical axis (e.g., a distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500), and TTL refers to a distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 3 may satisfy the range of 0.2< d1/TTL < 0.3. In addition, conditional expression 3 can satisfy the range of d1/TTL > 0.1.

[ conditional expression 4]

0.1<d1/imgH<0.4

In conditional expression 4, d1 refers to the distance between the first lens group and the second lens group on the optical axis (e.g., the distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500). imgH refers to the diagonal length of the image sensor 800 of the image plane. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 4 may satisfy the range of 0.15< d1/imgH < 0.3.

[ conditional expression 5]

0.8mm<d1<2.0mm

In conditional expression 5, d1 refers to the distance between the first lens group and the second lens group on the optical axis (e.g., the distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500). In addition, conditional expression 5 may satisfy the range of 1.0mm < d1<1.6 mm. In addition, conditional expression 5 may satisfy the range of d1<0.5 mm.

[ conditional expression 6]

0.1<THlg1/TTL<0.5

In conditional expression 6, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the first lens 100 to the image-side surface of the third lens 300), and TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 6 may satisfy the range of 0.2< THlg1/TTL < 0.35.

[ conditional expression 7]

0.1<THlg2/TTL<0.5

In conditional expression 7, THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object side surface of the fifth lens 500 to the image side surface of the sixth lens 600), and TTL refers to the distance on the optical axis from the object side surface of the first lens 100 to the image plane. In addition, conditional expression 7 may satisfy the range of 0.15< THlg2/TTL < 0.3.

[ conditional expression 8]

0.1<THlg1/imgH<0.4

In conditional expression 8, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the first lens 100 to the image-side surface of the third lens 300), and imgH refers to the diagonal length of the image plane of the image sensor 800. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 8 may satisfy the range of 0.15< THlg1/imgH < 0.3.

[ conditional expression 9]

0.1<THlg2/imgH<0.4

In conditional expression 9, THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object side surface of the fifth lens 500 to the image side surface of the sixth lens 600), and imgH refers to the diagonal length of the image plane of the image sensor 800. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 9 may satisfy the range of 0.15< THlg2/imgH < 0.3.

[ conditional expression 10]

0.5<THlg1/d1<1.5

In conditional expression 10, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the first lens 100 to the image-side surface of the third lens 300), and d1 refers to the distance on the optical axis between the first lens group and the second lens group (e.g., the distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500). In addition, conditional expression 10 may satisfy the range of 0.8< THlg1/d1< 1.3.

[ conditional expression 11]

1<THlg1/d2<2

In conditional expression 11, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the first lens 100 to the image-side surface of the third lens 300), and d2 refers to the thickness of the fourth lens 400 on the optical axis. In addition, conditional expression 11 may satisfy the range of 1.3< THlg1/d2< 1.8.

[ conditional expression 12]

0.5<THlg2/d1<1.5

In conditional expression 12, THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the fifth lens 500 to the image-side surface of the sixth lens 600), and d1 refers to the distance on the optical axis between the first lens group and the second lens group (e.g., the distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500). In addition, conditional expression 12 may satisfy the range of 0.7< THlg2/d1< 1.2.

[ conditional expression 13]

1<THlg2/d2<2

In conditional expression 13, THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the fifth lens 500 to the image-side surface of the sixth lens 600), and d2 refers to the thickness of the fourth lens 400 on the optical axis. In addition, conditional expression 13 may satisfy the range of 1.0< THlg2/d2< 1.7.

[ conditional expression 14]

0<TTL/|D_inf|<8

In conditional expression 14, TTL denotes a distance on the optical axis from the object-side surface of the first lens 100 to the image plane, and D _ inf denotes a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an infinite object distance. In addition, conditional expression 14 may satisfy the range of 1< TTL/| D _ inf | < 5.

[ conditional expression 15]

0.1<TTL/|D_macro|<0.5

In conditional expression 15, TTL refers to a distance on the optical axis from the object-side surface of the first lens 100 to the image plane, and D _ macro refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an object distance of 10 cm. In addition, conditional expression 15 may satisfy the range of 0.15< TTL/| D _ macro | < 0.4.

[ conditional expression 16]

0<imgH/|D_inf|<8

In conditional expression 16, imgH refers to a diagonal length of an image plane of the image sensor 800, and D _ inf refers to a value obtained by dividing 1000mm by a focal length of the fourth lens 400 at an infinite object distance. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 16 may satisfy the range of 1< imgH/| D _ inf | < 5.

[ conditional expression 17]

0.1<imgH/|D_macro|<0.4

In conditional expression 17, imgH refers to a diagonal length of an image plane of the image sensor 800, and D _ macro refers to a value obtained by dividing 1000mm by a focal length of the fourth lens 400 at an object distance of 10 cm. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 17 may satisfy the range of 0.2< imgH/| D _ mac | < 0.4.

[ conditional expression 18]

0.6<F_macro/F_inf<1.5

In conditional expression 18, F _ macro refers to the total focal length at 10cm, and F _ inf refers to the total focal length at an infinite object distance. In addition, conditional expression 18 may satisfy the range of 0.8< F _ macro/F _ inf < 1.2.

[ conditional expression 19]

0.5<Fno/|D_inf|<2.0

In conditional expression 19, Fno refers to the F-number of the entire optical system, and D _ inf refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an infinite object distance. In addition, conditional expression 19 may satisfy the range of 0.8< Fno/D _ inf < 1.4.

[ conditional expression 20]

0<Fno/D_macro<0.4

In conditional expression 20, Fno refers to the F-number of the entire optical system, and D _ macro refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an object distance of 10 cm. In addition, conditional expression 20 may satisfy the range of 0< Fno/D _ macro < 0.2.

[ conditional expression 21]

0.5<Fno/d1<4

In conditional expression 21, Fno refers to the F-number of the entire optical system, and d1 refers to the distance between the first lens group and the second lens group on the optical axis (e.g., the distance on the optical axis from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500). In addition, conditional expression 21 may satisfy the range of 1< Fno/d1< 3.

[ conditional expression 22]

0.5<Fg1/TTL<2

In conditional expression 22, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 22 may satisfy the range of 0.8< Fg1/TTL < 1.2.

[ conditional expression 23]

|Fg2|/TTL>1

In conditional expression 23, Fg2 refers to the combined focal length of the second lens group (e.g., from the fifth lens 500 to the sixth lens 600), and TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 23 may satisfy the range of | Fg2|/TTL > 3.

[ conditional expression 24]

0.5<Fg1/imgH<1.2

In conditional expression 24, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and imgH refers to the diagonal length of the image plane of the image sensor 800. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 24 may satisfy the range of 0.6< Fg1/imgH < 1.0.

[ conditional expression 25]

|Fg2|/imgH>1.0

In conditional expression 25, Fg2 refers to the combined focal length of the second lens group (e.g., from fifth lens 500 to sixth lens 600), and imgH refers to the diagonal length of the image plane of image sensor 800. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 25 may satisfy the range of | Fg2|/imgH > 2.

[ conditional expression 26]

0<f1/|L1R1|<5

In conditional expression 26, f1 denotes a focal length of the first lens 100, and L1R1 denotes a radius of curvature of the object-side surface of the first lens 100. In addition, conditional expression 26 may satisfy the range of 0< f1/| L1R1| <3.

[ conditional expression 27]

0<L2R2/|f2|<1

In conditional expression 27, L2R2 denotes a radius of curvature of the image-side surface of the second lens 200, and f2 denotes a focal length of the second lens 200. In addition, conditional expression 27 may satisfy the range of 0< L2R2/| f2| < 0.7.

[ conditional expression 28]

0.5<Fg1/f1<3.0

In conditional expression 28, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and f1 refers to the focal length of the first lens 100. In addition, conditional expression 28 may satisfy the range of 0.8< Fg1/f1< 2.0.

[ conditional expression 29]

0<Fg1/|f2|<5

In conditional expression 29, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and f2 refers to the focal length of the second lens 200. In addition, conditional expression 29 may satisfy the range of 0.5< Fg1/| f2| < 4.

[ conditional expression 30]

0<Fg1/|L1R1|<5

In conditional expression 30, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and L1R1 refers to the radius of curvature of the object-side surface of the first lens 100. In addition, conditional expression 30 may satisfy the range of 0< Fg1/| L1R1| <2.

[ conditional expression 31]

1<Fg1/L2R2<10

In conditional expression 31, Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), and L2R2 refers to the radius of curvature of the image-side surface of the second lens 200. In addition, conditional expression 31 may satisfy the range of 2< Fg1/L2R2< 5.

[ conditional expression 32]

|Fg2|/f1>1

In conditional expression 32, Fg2 refers to the combined focal length of the second lens group (e.g., from fifth lens 500 to sixth lens 600), and f1 refers to the focal length of the first lens 100. In addition, conditional expression 32 may satisfy the range of | Fg2|/f1> 5.

[ conditional expression 33]

|Fg2|/|f2|>1

In conditional expression 33, Fg2 refers to the combined focal length of the second lens group (e.g., from fifth lens 500 to sixth lens 600), and f2 refers to the focal length of the second lens 200. In addition, conditional expression 33 may satisfy the range of | Fg2|/| f2| > 5.

[ conditional expression 34]

|Fg2|/|L1R1|>0.2

In conditional expression 34, Fg2 refers to the combined focal length of the second lens group (e.g., from fifth lens 500 to sixth lens 600), and L1R1 refers to the radius of curvature of the object-side surface of the first lens 100. Conditional expression 34 may satisfy the range of | Fg2|/| L1R1| > 0.3.

[ conditional expression 35]

|Fg2|/L2R2>5

In conditional expression 35, Fg2 refers to the combined focal length of the second lens group (e.g., from fifth lens 500 to sixth lens 600), and L2R2 refers to the radius of curvature of the image-side surface of the second lens 200. In addition, conditional expression 35 may satisfy the range of | Fg2|/L2R2> 10.

[ conditional expression 36]

0<tan(DFOV/2)/|D_inf|<0.8

In conditional expression 36, DFOV means twice the angle between the light incident from the object side toward the maximum image height and the optical axis, and D _ inf means a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an infinite object distance. In addition, conditional expression 36 may satisfy the range of 0< tan (DFOV/2)/| D _ inf | < 0.5.

[ conditional expression 37]

0<tan(DFOV/2)/|D_macro|<0.5

In conditional expression 37, DFOV means twice the angle between the light incident from the object side toward the maximum image height and the optical axis, and D _ macro means a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an object distance of 10 cm. In addition, conditional expression 37 may satisfy the range of 0< tan (DFOV/2)/| D _ macro | < 0.2.

[ conditional expression 38]

1.5<G1<1.7

In conditional expression 38, G1 refers to the refractive index of the material of the first lens 100. In addition, G1 may refer to the refractive index of the first lens 100 at a wavelength of 587 nm. In addition, conditional expression 38 may satisfy the range of 1.53< G1< 1.65.

[ conditional expression 39]

20<V1<60

In conditional expression 39, v1 refers to the abbe number of the first lens 100. In addition, conditional expression 39 may satisfy the range of 21< V1< 58.

[ conditional expression 40]

0<|L1R2|/|L1R1|<1

In conditional expression 40, L1R2 refers to the radius of curvature of the image-side surface of the first lens 100, and L1R1 refers to the radius of curvature of the object-side surface of the first lens 100. In addition, conditional expression 40 may satisfy the range of 0< | L1R2|/| L1R1| < 0.5.

[ conditional expression 41]

0.7<TTL/imgH<1.3

In conditional expression 41, TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane, and imgH refers to the diagonal length of the image plane of the image sensor 800. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800. In addition, conditional expression 41 may satisfy the range of 0.5< TTL/imgH <1. In addition, conditional expression 41 may satisfy the range of 0.5< TTL/imgH < 1.5.

[ conditional expression 42]

0.5<F_inf/TTL<1.5

In conditional expression 42, F _ inf denotes a total focal length at an infinite object distance, and TTL denotes a distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 42 may satisfy the range of 0.6< F _ inf/TTL < 1.0.

[ conditional expression 43]

0.5<F_macro/TTL<1

In conditional expression 43, F _ macro refers to a total focal length at an object distance of 10cm, and TTL refers to a distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 43 may satisfy the range of 0.6< F _ macro/TTL < 0.8.

[ conditional expression 44]

0.5<F_inf/f1<2

In conditional expression 44, F _ inf refers to the total focal length of the object from infinity, and F1 refers to the focal length of the first lens 100. In addition, conditional expression 44 may satisfy the range of 0.7< F _ inf/F1< 1.5.

[ conditional expression 45]

0.5<F_macro/f1<2

In conditional expression 45, F _ macro refers to a total focal length at an object distance of 10cm, and F1 refers to a focal length of the first lens 100. In addition, conditional expression 45 may satisfy the range of 0.65< F _ macro/F1< 1.5.

[ conditional expression 46]

0.2<F_inf/|f2|<3

In conditional expression 46, F _ inf refers to the total focal length of the object from infinity, and F2 refers to the focal length of the second lens 200. In addition, conditional expression 46 may satisfy the range of 0.4< F _ inf/| F2| <2.

[ conditional expression 47]

0.2<F_macro/|f2|<2.0

In conditional expression 47, F _ macro refers to the total focal length at an object distance of 10cm, and F2 refers to the focal length of the second lens 200. In addition, conditional expression 47 may satisfy the range | <1.8 of 0.4< F _ macro// F2.

[ conditional expression 48]

1<THlg1/THlg2<2

In conditional expression 48, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object side surface of the first lens 100 to the image side surface of the third lens 300), and THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object side surface of the fifth lens 500 to the image side surface of the sixth lens 600). In addition, conditional expression 48 may satisfy the range of 1< THlg1/THlg2< 1.5.

[ conditional expression 49]

G2>G1

In conditional expression 49, G1 refers to the refractive index of the material of the first lens 100, and G2 refers to the refractive index of the material of the second lens 200. In addition, G1 may refer to a refractive index of the first lens 100 at a wavelength of 587nm, and G2 may refer to a refractive index of the second lens 200 at a wavelength of 587 nm.

[ conditional expression 50]

|L2R2|<|L2R1|

In conditional expression 50, L2R2 refers to the radius of curvature of the image-side surface of the second lens 200, and L2R1 refers to the radius of curvature of the object-side surface of the second lens 200.

[ conditional expression 51]

0.5<F/TTL<1.0

In conditional expression 51, F refers to the total effective focal length of the entire optical system, that is, the total effective focal lengths of the first lens 100 to the sixth lens 600, and TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane. In addition, conditional expression 51 may satisfy the range of 0.5< F/TTL < 0.8.

[ conditional expression 52]

L2R2/L3R1<1

In conditional expression 52, L2R2 refers to the radius of curvature of the image-side surface of the second lens 200, and L3R1 refers to the radius of curvature of the object-side surface of the third lens 300. In addition, conditional expression 52 may satisfy the range of 0< L2R2/L3R1< 0.6.

[ conditional expression 53]

SAG5>0

In conditional expression 53, SAG refers to a ratio of an intersection point on the optical axis C where vertical lines drawn from corresponding regions of the lens surface of the lens intersect toward the optical axis C to a vertex of the lens. In addition, SAG5 refers to the SAG value at position P of 80% of the effective diameter of the fifth lens 500. That is, when a vertical line, i.e., the effective diameter of the fifth lens 500, is drawn from the end region toward the optical axis C, the intersection with the optical axis C may be closer to the object side direction than the vertex of the object side surface of the fifth lens 500, and when a vertical line, i.e., 80% of the effective diameter of the fifth lens 500, is drawn from the position P toward the optical axis C, the intersection with the optical axis C may be closer to the image side direction than the vertex of the object side surface of the fifth lens 500.

[ conditional expression 54]

0<THlg1/|D_inf|<2

In conditional expression 54, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the first lens 100 to the image-side surface of the third lens 300), and D _ inf refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at the infinite object distance. In addition, conditional expression 54 may satisfy the range of 0.3< THlg1/| D _ inf | < 1.5.

[ conditional expression 55]

0<THlg2/|D_inf|<1.5

In conditional expression 55, THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the fifth lens 500 to the image-side surface of the sixth lens 600), and D _ inf refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an infinite object distance. In addition, conditional expression 55 may satisfy the range of 0.3< THlg2/| D _ inf | < 1.0.

[ conditional expression 56]

0<THlg1/|D_macro|<0.5

In conditional expression 56, THlg1 refers to the thickness of the first lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the first lens 100 to the image-side surface of the third lens 300), and D _ macro refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an object distance of 10 cm. In addition, conditional expression 56 may satisfy the range of 0< THlg1/| D _ macro | < 0.2.

[ conditional expression 57]

0<THlg2/|D_macro|<0.5

In conditional expression 57, THlg2 refers to the thickness of the second lens group on the optical axis (e.g., the distance on the optical axis from the object-side surface of the fifth lens 500 to the image-side surface of the sixth lens 600), and D _ macro refers to a value obtained by dividing 1000mm by the focal length of the fourth lens 400 at an object distance of 10 cm. In addition, conditional expression 57 may satisfy the range of 0< THlg2/| D _ macro | < 0.2.

[ conditional expression 58]

0.5<TTL/Fg1<2

In conditional expression 58, TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane, and Fg1 refers to the combined focal length of the first lens group (e.g., from the first lens 100 to the third lens 300). In addition, conditional expression 58 may satisfy the range of 0.8< TTL/Fg1< 1.5.

[ conditional expression 59]

0<TTL/|Fg2|<0.5

In conditional expression 59, TTL refers to the distance on the optical axis from the object-side surface of the first lens 100 to the image plane, and Fg2 refers to the combined focal length of the second lens group (e.g., from the fifth lens 500 to the sixth lens 600). In addition, conditional expression 59 may satisfy the range of 0< TTL/| Fg2| < 0.3.

[ conditional expression 60]

0<L2R2/|L2R1|<1

In conditional expression 60, L2R2 refers to the radius of curvature of the image-side surface of the second lens 200, and L2R1 refers to the radius of curvature of the object-side surface of the second lens 200. In addition, conditional expression 60 may satisfy the range 0< L2R2/| L2R1| < 0.5.

[ conditional expression 61]

THI>0.5

In conditional expression 61, THI refers to an optical axis distance from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500. That is, the distance between the image-side surface of the third lens 300 and the object-side surface of the fifth lens 500 may be greater than 0.5 mm.

[ conditional expression 62]

THI/TTL>0.1

In conditional expression 62, THI denotes a distance from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500, and TTL denotes a distance on the optical axis from the object-side surface of the first lens 100 to the image plane. That is, a ratio of a distance between the image-side surface of the third lens 300 and the object-side surface of the fifth lens 500 with respect to a distance between the object-side surface of the first lens 100 and the image sensor 800 may be greater than 0.1.

[ conditional expression 63]

THI/(Yx2)>0.1

In conditional expression 63, THI denotes a distance from the image-side surface of the third lens 300 to the object-side surface of the fifth lens 500, and Y denotes a distance in the vertical direction from the optical axis C of the image sensor 800 to the maximum image height. That is, the ratio of the distance between the image-side surface of the third lens 300 and the object-side surface of the fifth lens 500 to twice the image height may be greater than 0.1.

[ conditional expression 64]

0.5<TTL/(Yx2)<1.5

In conditional expression 64, TTL denotes a distance on the optical axis from the object-side surface of the first lens 100 to the image plane, and Y denotes a distance in the vertical direction from the optical axis C of the image sensor 800 to the maximum image height. That is, a ratio of a distance between the object side surface of the first lens 100 and the image sensor 800 to twice the image height may be between 0.5 and 1.5.

[ conditional expression 65]

R5/R6<1

In conditional expression 65, R5 refers to the radius of the image-side surface of the second lens 200, and R6 refers to the radius of the object-side surface of the third lens 300. That is, this means that the ratio of the radius of the image-side surface of the second lens 200 to the radius of the object-side surface of the third lens 300 may be less than 1.

The following non-spherical surface can be obtained from equation 1. The E followed by the numbers for conic constant k and aspheric coefficients A, B, C, D, E and F represent powers of 10. For example, E +01 represents 10¹And E-02 represents 10^-2。

[ equation 1]

Here, z is a distance from the vertex of the lens to the optical axis direction. c refers to the base curvature of the lens. Y refers to a distance in a direction perpendicular to the optical axis. K refers to the conic constant. A. B, C, D and E represent aspheric coefficients.

[ TABLE 1]

Table 1 shows the surface number (surface), Radius of curvature (Radius), thickness of the center of each lens or distance between lens surfaces (THlckness), refractive Index (Index), and Abbe number (Abbe) of the imaging lens according to the first exemplary embodiment of the present invention. At this time, the unit of the radius of curvature and the thickness or distance may be mm.

[ TABLE 2]

Table 2 shows values of an aspherical coefficient and a conic constant (k) of each lens surface of the imaging lens according to the first exemplary embodiment of the present invention.

[ TABLE 3]

Table 3 shows characteristics of the imaging lens according to the first exemplary embodiment of the present invention. imgH refers to a diagonal length of an image plane of the image sensor 800, F _ inf refers to a total focal length at an infinite object distance, F _ macro refers to a total focal length at an object distance of 10cm, D _ inf refers to a value obtained by dividing 1000mm by a focal length of the fourth lens 400 at an infinite object distance, D _ macro refers to a value obtained by dividing 1000mm by a focal length of the fourth lens 400 at an object distance of 10cm, Fg1 refers to a composite focal length of the first lens group (e.g., from the first lens 100 to the third lens 300), Fg2 refers to a composite focal length of the second lens group (e.g., from the fifth lens 500 to the sixth lens 600), TTL refers to a distance on an optical axis from an object-side surface of the first lens 100 to the image plane (imaging surface), Fno is an F-number of the entire optical system, DFOV refers to twice an angle between light incident from the object side toward a maximum image height and the optical axis, G1 is a refractive index of a material of the first lens 100, and G2 denotes a refractive index of a material of the second lens 200, v1 denotes an abbe number of the first lens 100, d1 denotes a distance between the first lens group and the second lens group on an optical axis (e.g., a distance on the optical axis from an image-side surface of the third lens 300 to an object-side surface of the fifth lens 500), d2 denotes a thickness of the fourth lens 400 on the optical axis, THlg1 denotes a thickness of the first lens group on the optical axis (e.g., a distance on the optical axis from an object-side surface of the first lens 100 to an image-side surface of the third lens 300), THlg2 denotes a thickness of the second lens group on the optical axis (e.g., a distance on the optical axis from an object-side surface of the fifth lens 500 to an image-side surface of the sixth lens 600), f1 denotes a focal length of the first lens 100, f2 denotes a focal length of the second lens 200, L1R1 denotes a radius of curvature of the object-side surface of the first lens 100, L2R2 denotes a radius of curvature of the image-side surface of the second lens 200, L1R2 refers to a radius of curvature of an image-side surface of the first lens 100, L3R1 refers to a radius of curvature of an object-side surface of the third lens 300, SAG refers to a ratio of an intersection point on the optical axis C where a vertical line drawn from a corresponding region of a lens surface of the lens intersects toward the optical axis C to a vertex of the lens, F refers to a total effective focal length of the entire optical system, i.e., the total effective focal length of the first lens 100 to the sixth lens 600, THI refers to a distance from the image-side surface of the third lens 300 to an object-side surface of the fifth lens 500, Y refers to a distance in the vertical direction from the optical axis C of the image sensor 800 to the maximum image height, R5 refers to a radius of an image-side surface of the second lens 200, R6 refers to a radius of an object-side surface of the third lens 300, and SAG5 refers to an SAG value at a position P of 80% of the effective diameter of the fifth lens 500. At this time, units of imgH, TTL, Fno, F _ inf, F _ macro, Fg1, Fg2, d1, d2, THlg1, THlg2, F1, F2, L1R1, L2R2, and L1R2 may be mm.

Hereinafter, a concept of a diagonal field of view (DFOV) of the imaging lens according to the present exemplary embodiment will be described with reference to the drawings.

At this time, the field of view (FOV) may be a diagonal field of view (DFOV). Diagonal field of view DFOV) can be distinguished from horizontal field of view (HFOV) and vertical field of view (VFOV). For example, the horizontal field of view (HFOV) may be 0.8 times the diagonal field of view (DFOV). Additionally, the field of view (FOV) may be distinguished from the half field of view (HFOV). The field of view (FOV) refers to the diameter of an imaginary circle connecting the four vertices of the image sensor, and the half field of view (HFOV) may refer to the radius of the mentioned imaginary circle. That is, the field of view (FOV) may be twice the half field of view (HFOV).

The diagonal view angle (DFOV) can be calculated using the following equation.

[ equation ]

DFOV＝2*arctan(imgH/(2*F))

Here, imgH refers to a diagonal length of an image plane of the image sensor 800, and F refers to an effective focal length of the optical system. In addition, imgH may represent twice the distance in the vertical direction from the optical axis of the image plane to the maximum image height. In addition, imgH may be equal to the diagonal length of the active area 810 of the image sensor 800.

Hereinafter, the configuration of an imaging lens according to a second exemplary embodiment of the present invention will be described with reference to the drawings.

The imaging lens according to the second exemplary embodiment of the present invention may include a plurality of lenses. The imaging lens may include six lenses. The imaging lens may include a first lens 100, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, a sixth lens 600, and an aperture stop. It may comprise. However, in the imaging lens according to the second exemplary embodiment, any one or more of the first lens 100, the second lens 200, the third lens 300, the fourth lens 400, the fifth lens 500, the sixth lens 600, and the aperture stop may be omitted. The imaging lens may be provided with a first lens 100, an aperture stop, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, and a sixth lens 600 in this order from the object side to the image side. The imaging lens according to the second exemplary embodiment may be constituted by five or less lenses. Alternatively, the imaging lens according to the second exemplary embodiment may be composed of seven or more lenses.

In another exemplary embodiment, one or more of another lens, a flat plate, and an optical member may be added between the first lens 100 and the sixth lens 600. In addition, at least one of another lens, a flat plate, and an optical member may be added in front of the first lens 100 or behind the sixth lens 600. In addition, any one or more of another lens, a flat plate, and an optical member may be added between the aperture stop and the lens, between the lens and the optical filter 700, and between the optical filter 700 and the image sensor 800. At this time, the filter 700 may be a flat lens. The refractive power of the flat lens may be '0'. A flat lens may have no refractive power. In addition, filter layers may be disposed between the aperture stop and the lens, between the lens and the filter 700, and between the filter 700 and the image sensor 800. In this case, the filter layer may be coated to become a filter.

The first lens 100 according to the second exemplary embodiment may have a positive refractive power. The object-side surface of the first lens 100 may be concave. The first lens 100 may be formed such that the object-side surface is concave on the optical axis. The first lens 100 may include an object-side surface having a concave shape. The first lens 100 may include an object-side surface having a concave shape on an optical axis. The image-side surface of the first lens 100 may be convex. The first lens 100 may have a convex image-side surface on the optical axis. The first lens 100 may include an image side surface having a convex shape. The first lens 100 may include an image side surface having a convex shape on an optical axis. The first lens 100 may be formed in a meniscus shape whose image side surface is convex. The first lens 100 may be formed in a meniscus shape in which an image side surface is convex on an optical axis. The object-side surface or the image-side surface of the first lens 100 may include at least one inflection point.

The radius of curvature of the object-side surface of the first lens 100 may be negative. The radius of curvature of the object-side surface of the first lens 100 at the optical axis may be negative. The radius of curvature of the image-side surface of the first lens 100 may be negative. The radius of curvature of the image-side surface in the optical axis of the first lens 100 may be negative. The absolute value of the radius of curvature of the object-side surface of the first lens 100 may be greater than the absolute value of the radius of curvature of the image-side surface of the first lens 100. The first lens 100 may be a solid lens.

The imaging lens according to the second exemplary embodiment uses the same reference numerals for the imaging lens and the radius of curvature, the center thickness of each lens or the distance between lens surfaces, the refractive index, the abbe number, and the same components according to the first exemplary embodiment, and the description thereof will be omitted. For the omitted part of the description of the imaging lens according to the second exemplary embodiment, the description of the imaging lens according to the first exemplary embodiment may be applied by analogy.

[ TABLE 4]

Table 4 shows the surface number (surface), Radius of curvature (Radius), thickness of the center of each lens or distance between lens surfaces (THlckness), refractive Index (Index), and Abbe number (Abbe) of the imaging lens according to the first exemplary embodiment of the present invention. At this time, the unit of the radius of curvature and the thickness or distance may be mm.

[ TABLE 5]

Table 5 shows values of an aspherical coefficient and a conic constant (k) of each lens surface of the imaging lens according to the second exemplary embodiment of the present invention.

[ TABLE 6]

Table 6 shows characteristics of the imaging lens according to the second exemplary embodiment of the present invention.

Hereinafter, the configuration of an imaging lens according to a third exemplary embodiment of the present invention will be described with reference to the drawings.

The imaging lens according to the third exemplary embodiment of the present invention may include a plurality of lenses. The imaging lens may include six lenses. The imaging lens may include a first lens 100, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, a sixth lens 600, and an aperture stop. It may comprise. However, in the imaging lens according to the third exemplary embodiment, any one or more of the first lens 100, the second lens 200, the third lens 300, the fourth lens 400, the fifth lens 500, the sixth lens 600, and the aperture stop may be omitted. The imaging lens may be provided with a first lens 100, an aperture stop, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, and a sixth lens 600 in this order from the object side to the image side. The imaging lens according to the second exemplary embodiment may be composed of five or less lenses. Alternatively, the imaging lens according to the third exemplary embodiment may be composed of seven or more lenses.

In another exemplary embodiment, one or more of another lens, a flat plate, and an optical member may be added between the first lens 100 to the sixth lens 600. In addition, at least one of another lens, a flat plate, and an optical member may be added in front of the first lens 100 or behind the sixth lens 600. In addition, any one or more of another lens, a flat plate, and an optical member may be added between the aperture stop and the lens, between the lens and the optical filter 700, and between the optical filter 700 and the image sensor 800. At this time, the filter 700 may be a flat lens. The refractive power of the flat lens may be '0'. A flat lens may have no refractive power. In addition, filter layers may be provided between the aperture stop and the lens, between the lens and the filter 700, and between the filter 700 and the image sensor 800. In this case, the filter layer may be coated to become a filter.

The third lens 300 may have a positive refractive power. Both surfaces of the third lens 300 may be convex. Both surfaces of the third lens 300 may be convex on the optical axis. The object-side surface of the third lens 300 may be convex. The third lens 300 may have a convex object-side surface on the optical axis. The third lens 300 may include an object-side surface having a convex shape. The third lens 300 may include an object-side surface having a convex shape on an optical axis. The image-side surface of the third lens 300 may be convex. The third lens 300 may have a convex image-side surface on the optical axis. The third lens 300 may include an image side surface having a convex shape. The third lens 300 may include an image side surface having a convex shape on an optical axis. The object-side surface or the image-side surface of the third lens 300 may include at least one inflection point.

The radius of curvature of the object-side surface of the third lens 300 may be positive. The radius of curvature of the object-side surface of the third lens 300 on the optical axis may be positive. The radius of curvature of the image-side surface of the third lens 300 may be negative. The radius of curvature of the image-side surface of the third lens 300 on the optical axis may be negative. An absolute value of a radius of curvature of the object-side surface of the third lens 300 may be greater than an absolute value of a radius of curvature of the image-side surface of the third lens 300. The third lens 300 may be a solid lens.

The imaging lens according to the third exemplary embodiment uses the same reference numerals for the imaging lens and the radius of curvature, the center thickness of each lens or the distance between lens surfaces, the refractive index, the abbe number, and the same components according to the first exemplary embodiment, and the description thereof will be omitted. For the omitted part of the description of the imaging lens according to the third exemplary embodiment, the description of the imaging lens according to the first exemplary embodiment may be applied by analogy.

[ TABLE 7]

Surface of	Radius of curvature	Thickness of	Refractive index	Abbe#
						1*	21.208	0.465	1.5441	56.1
2*	-3.379	0.105
					Diaphragm	Infinity(s)	0.026
3*	3.971	0.300	1.6714	19.2
					4*	1.418	0.309
5*	8.695	0.511	1.5441	56.1
					6*	-4.794	0.126
7	Infinity(s)
					8	Infinity(s)
9	Variable
					10	Infinity(s)
11	Infinity(s)	0.502
					12*	-39.141	0.556	1.5441	56.1
13*	-4.119	0.039
					14*	1.718	0.589	1.6613	20.3
15*	1.076	0.682
					Light filter	Infinity(s)	0.110	1.523	54.5
Image of a person	Infinity(s)	0.484

Table 7 shows the surface number (surface), Radius of curvature (Radius), thickness of the center of each lens or distance between lens surfaces (THlckness), refractive Index (Index), and Abbe number (Abbe) of the imaging lens according to the first exemplary embodiment of the present invention. At this time, the unit of the radius of curvature and the thickness or distance may be mm.

[ TABLE 8]

Table 8 shows values of an aspherical coefficient and a conic constant (k) of each lens surface of the imaging lens according to the third exemplary embodiment of the present invention.

[ TABLE 9]

Table 9 shows characteristics of the imaging lens according to the third exemplary embodiment of the present invention.

[ TABLE 10]

Referring to table 10, it can be seen that the first to third embodiments of the present invention satisfy all the conditional expressions. In addition, the first to third embodiments of the present invention may satisfy 1.2< d1/d2<1.8, 0< Fg1/| Fg2| <0.5, and 0.1< d1/TTL < 0.4. Alternatively, the first to third embodiments of the present invention may satisfy 0.1< d1/imgH <0.4, 0.8< d1<2.0, 0.1< THlg1/TTL <0.5, and 0.1< THlg2/TTL < 0.5. Alternatively, the first to third embodiments of the invention may satisfy 0.1< THlg1/imgH <0.4, 0.1< THlg2/imgH <0.4, and 0.5< THlg1/d1< 1.5. Alternatively, the first to third embodiments of the present invention may satisfy 1< THlg1/D2<2, 0.5< THlg2/D1<1.5, 1< THlg2/D2<2, and 0< TTL/| D _ inf | < 8. Alternatively, the first to third embodiments of the present invention may satisfy 0.1< TTL/| D _ macro | <0.5, 0< imgH/| D _ inf | <8, and 0.1< imgH/| D _ macro | < 0.4.

Alternatively, the first to third embodiments of the present invention may satisfy 0.6< F _ macro/F _ inf <1.5, 0.5< Fno/| D _ inf | <2, 0< Fno/| D _ macro | <0.4, 0.5< Fno/D1< 4. Alternatively, the first to third embodiments of the present invention may satisfy 0.5< Fg1/TTL <2, | Fg2|/TTL >1, 0.5< Fg1/imgH <1.2, | Fg2|/imgH > 1.0. Alternatively, the first to third embodiments of the present invention may satisfy 0< f1/| L1R1| <5, 0< L2R2/| f2| <1, 0.5< Fg1/f1<3.0, 0< Fg1/| f2| < 5.

Alternatively, the first to third embodiments of the present invention may satisfy 0< Fg1/| L1R1| <5, 1< Fg1/L2R2<10, | Fg2|/f1>1, and | Fg2|/| f2| >1. Alternatively, the first to third embodiments of the present invention may satisfy | Fg2|/| L1R1| >0.2, | Fg2|/L2R2>5, 0< tan (DFOV/2) |/| D _ inf | <0.8, 0< tan (DFOV/2)/| D _ macro | <0.5, and 1.5< G1< 1.7. Alternatively, the first to third embodiments of the present invention may satisfy 20< V1<60, 0< | L1R2|/| L1R1| <1, 0.7< TTL/imgH <1.3, and 0.5< F _ inf/TTL < 1.5.

Hereinafter, a camera module according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The camera device may include a camera module 70. The camera module 70 may include a lens driving device. The lens driving means may be a Voice Coil Motor (VCM). The lens driving means may be a lens driving motor. The lens driving means may be a lens driving actuator. The lens driving apparatus may include an AF module. The lens driving apparatus may include an OIS module.

The camera module 70 may include a substrate 10. The substrate 10 may be a Printed Circuit Board (PCB). The substrate 10 may include an upper surface. An image sensor and a sensor base 40 may be disposed on an upper surface of the substrate 10. The substrate 10 may include terminals 11. The terminals 11 of the substrate 10 may be electrically connected to the terminals of the holder 61 through conductive members.

The camera module 70 may include an image sensor (not shown). The image sensor may be disposed in the substrate 10. The image sensor may be disposed on the substrate 10. The image sensor may be disposed on the upper surface of the substrate 10. The image sensor may be electrically connected to the substrate 10. In one example, the image sensor may be coupled to the substrate 10 by a Surface Mount Technology (SMT). As another example, the image sensor may be coupled to the substrate 10 by a flip chip technique. The image sensor may be disposed such that the imaging lens coincides with the optical axis. That is, the optical axis of the image sensor and the optical axis of the imaging lens may be aligned. The image sensor may convert light irradiated to an effective image area of the image sensor into an electrical signal. The image sensor may be any one of a Charge Coupled Device (CCD), a Metal Oxide Semiconductor (MOS), a CPD, and a CID.

The camera module 70 may include a connector 20. The connector 20 may be connected to the substrate 10 through the connection substrate 30. The connector 20 may include a port for electrical connection with an external device.

The camera module 70 may include a sensor base 40. The sensor base 40 may be disposed between the holder 61 and the substrate 10. A filter 50 may be provided on the sensor base 40. An opening may be formed in a portion of the sensor base 40 where the filter 50 is disposed so that light passing through the filter 50 may be incident on the image sensor.

The camera module 70 may include the optical filter 50. The filter 50 may include an infrared filter. The infrared filter may block light in an infrared region from entering the image sensor. The infrared filter may reflect infrared light. Alternatively, the infrared filter may absorb infrared rays. The infrared filter may be disposed between the lens module and the image sensor. The infrared filter may be provided in the sensor base 40.

The camera module 70 may include a lens driving device 60. The lens driving device 60 may include a holder 61, a lens holder 62, a cover 63, and an imaging lens. The lens driving device 60 may perform the AF function and/or the OIS function by using a liquid lens. The lens driving device 60 may be provided in the sensor base 40. As a modified example, the lens driving device 60 may be directly provided on the substrate 10 without the sensor base 40.

The camera module 70 may include a holder 61. The holder 61 may be disposed on the substrate 10. The holder 61 may be provided in the sensor base 40. The holder 61 may be disposed on an upper surface of the sensor base 40. The holder 61 may be coupled to the sensor base 40. The holder 61 may be combined with a lens module. The holder 61 may be disposed inside the cover 63. The holder 61 may be formed of an insulating material.

The lens module may include a lens holder 62. The lens holder 62 may be a lens barrel. The lens holder 62 may be combined with the holder 61. The lens holder 62 may be disposed in the holder 61. The lens holder 62 may accommodate therein an imaging lens. The inner circumferential surface of the lens holder 62 may be formed in a shape corresponding to the outer circumferential surface of the lens. The lens holder 62 may be formed of an insulating material.

The lens module may include an imaging lens. The imaging lens may be disposed in the lens holder 62. The imaging lens may include a plurality of lenses. The imaging lens may comprise a variable focus lens. The imaging lens may be the imaging lens according to the present exemplary embodiment described above.

The camera module 70 may include a cover 63. The cover 63 may cover the holder 61. The cover 63 may be combined with the holder 61. A portion of the lens module may be accommodated in the cover 63. The cover 63 may form the appearance of the camera module 70. The cover 63 may have a hexahedral shape with a lower surface open. The cover 63 may be a non-magnetic material. The cover 63 may be formed of a metal material. The cover 63 may be formed of a metal plate. The cover 63 may be connected to the ground portion of the substrate 10. Thereby, the cover 63 can be grounded. The cover 63 may shield electromagnetic interference (EMI). In this case, the cover 63 may be referred to as an "EMI shield".

Although the exemplary embodiments of the present invention have been described above with reference to the accompanying drawings, it can be understood by those skilled in the art to which the present invention pertains that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. It should therefore be understood that the above-described exemplary embodiments are illustrative in all respects and not restrictive.

Claims

1. An imaging lens system comprising:

a first lens group including at least one solid lens;

a second lens group spaced apart from the first lens group and comprising at least one solid lens; and

a variable focus lens disposed between the first lens group and the second lens group,

wherein the following conditional expression 1 is satisfied:

[ conditional expression 1]

1<THlg1/THlg2<2

Wherein THlg1 in conditional expression 1 refers to a thickness of the first lens group on an optical axis, and THlg2 refers to a thickness of the second lens group on the optical axis.

2. The imaging lens system of claim 1, wherein the number of solid lenses of the first lens group is greater than the number of solid lenses of the second lens group.

3. The imaging lens system according to claim 1, wherein a lens closest to an object side in the first lens group has a positive refractive power, and a lens closest to an image side in the second lens group has a negative refractive power.

4. The imaging lens system according to claim 1, wherein the first lens group includes a first lens having positive refractive power, a second lens, and a third lens, and the second lens group includes a fourth lens having positive refractive power and a fifth lens having negative refractive power.

5. The imaging lens system according to claim 4, wherein the following conditional expression 2 is satisfied:

[ conditional expression 2]

|L2R2|<|L2R1|

Wherein, in conditional expression 2, L2R2 refers to a radius of curvature of an image-side surface of the second lens, and L2R1 refers to a radius of curvature of an object-side surface of the second lens.

6. The imaging lens system according to claim 2, wherein the following conditional expression 3 is satisfied:

[ conditional expression 3]

G2>G1

Wherein, in conditional expression 3, G1 denotes a refractive index of a material of the first lens, and G2 denotes a refractive index of a material of the second lens.

7. An imaging lens system comprising:

a first lens having a positive refractive power;

a second lens;

a third lens;

a fourth lens;

a fifth lens having a positive refractive power; and

a sixth lens having a negative refractive power,

wherein the first lens to the sixth lens are arranged in order from an object side to an image side,

wherein the first to third lenses and the fifth and sixth lenses are solid lenses,

wherein the fourth lens comprises a variable focus lens, and

wherein the following conditional expression 4 is satisfied:

[ Condition expression 4]

|L2R2|<|L2R1|

Wherein, in conditional expression 4, L2R2 refers to a radius of curvature of an image-side surface of the second lens, and L2R1 refers to a radius of curvature of an object-side surface of the second lens.

8. An imaging lens system comprising:

a first lens group including at least one solid lens;

wherein the following conditional expression 5 is satisfied:

[ conditional expression 5]

0.1<THlg1/TTL<0.5

Wherein, in conditional expression 5, THlg1 refers to a thickness of the first lens group on an optical axis, and TTL refers to a distance on the optical axis from an object side surface of the first lens to an imaging surface.

9. An imaging lens system comprising:

a first lens group including at least one solid lens;

wherein the following conditional expression 6 is satisfied:

[ conditional expression 6]

0<Fg1/|Fg2|<0.5

Wherein, in conditional expression 6, Fg1 refers to a focal length of the first lens group, and Fg2 refers to a focal length of the second lens group.

10. A camera module, comprising:

an image sensor;

the imaging lens system of claim 1; and

a filter disposed between the image sensor and the imaging lens.