Optical system and camera module

Abstract

An optical system according to an embodiment of the present invention comprises first to fourth lens groups arranged along the optical axis, wherein the first lens group has positive (+) refractive power, the second lens group has negative (−) refractive power, the third lens group has positive (+) refractive power, and the fourth lens group has positive (+) refractive power, a prism lens is arranged to be closest to the object side in the first lens group, the prism lens includes an incident surface, a reflective surface, and an emission surface, and the incident surface or the emission surface of the prism lens has a convex shape.

Description

Optical system and camera module

[0001] The present invention relates to an optical system for improved optical performance and a camera module including the same.

[0002] Camera modules capture objects and store them as images or videos, and are used in a variety of applications. In particular, camera modules are manufactured in ultra-small sizes and are used in portable devices such as smartphones, tablet PCs, and laptops, as well as drones and vehicles, providing a variety of functions.

[0003] For example, the optical system of a camera module may include an imaging lens that forms an image, and an image sensor that converts the formed image into an electrical signal. At this time, the camera module may perform an autofocus (AF) function that automatically adjusts the distance between the image sensor and the imaging lens to align the focal length of the lens, and may perform a zooming function of zooming up or zooming out to increase or decrease the magnification of a distant object to take a picture through a zoom lens. In addition, the camera module adopts an image stabilization (IS) technology to correct or prevent shaking of the image caused by movement of the camera due to an unstable fixing device or movement of the user.

[0004] The most crucial element for these camera modules to capture images is the imaging lens that forms the image. Recently, interest in high-performance features, such as high definition and resolution, has been increasing, and research is underway on optical systems that incorporate multiple lenses to achieve these goals.

[0005] For example, research is underway to implement high-performance optical systems using multiple imaging lenses with either positive (+) or negative (-) refractive power. However, the inclusion of multiple lenses can increase the overall optical system size, making it difficult to achieve superior optical and aberration characteristics.

[0006] Additionally, an optical system comprising multiple lenses can be relatively tall. For example, as the number of lenses increases, the distance between the image sensor and the object plane of the adjacent lens may increase. Consequently, the overall thickness and length of a device, such as a smartphone, in which the optical system is positioned may increase, making miniaturization difficult.

[0007] Additionally, there is a problem that it is difficult to improve optical performance through lenses.

[0008] The present invention seeks to provide a zoom optical system and camera module with improved optical characteristics.

[0009] The present invention seeks to provide an optical system and camera module having excellent optical performance in low-temperature to high-temperature environments.

[0010] The present invention seeks to provide an optical system and camera module capable of preventing or minimizing changes in optical properties over a wide temperature range.

[0011] In order to solve the above technical problem, an optical system according to an embodiment of the present invention includes first to fourth lens groups arranged along an optical axis, wherein the first lens group has positive (+) refractive power, the second lens group has negative (-) refractive power, the third lens group has positive (+) refractive power, and the fourth lens group has positive (+) refractive power, and a prism lens is arranged closest to an object side in the first lens group, and the prism lens includes an incident surface, a reflective surface, and an exit surface, and the incident surface or the exit surface of the prism lens may have a convex shape.

[0012] The first lens group and the third lens group may be fixed groups, and the second lens group and the fourth lens group may be moving groups.

[0013] The lens included in the third lens group may have a biconvex shape.

[0014] At the wide-angle end, the distance between the first lens group and the second lens group on the optical axis may be smaller than the distance between the second lens group and the third lens group, and at the telephoto end, the distance between the first lens group and the second lens group on the optical axis may be larger than the distance between the second lens group and the third lens group.

[0015] In the second lens group, the lens placed closest to the object side may have a concave shape on both sides.

[0016] The first lens group may include a first lens having positive (+) refractive power, the second lens group may include a second lens having negative (-) refractive power, a third lens having negative (-) refractive power, and a fourth lens having positive (+) refractive power, the third lens group may include a fifth lens having positive (+) refractive power, and the fourth lens group may include a sixth lens having positive (+) refractive power, a seventh lens having negative (-) refractive power, and an eighth lens having positive (+) refractive power.

[0017] An aperture may be placed between the fourth lens and the fifth lens or between the fifth lens and the sixth lens.

[0018] Among the first to eighth lenses, the effective diameter of the fifth lens may be the largest.

[0019] The following condition can be satisfied. <Condition> 1.5 < f_tele / f_wide < 2 (In the above condition, f_tele is the total focal length of the optical system at the telephoto end, and f_wide is the total focal length of the optical system at the wide-angle end.)

[0020] The following condition can be satisfied. <Condition> 0.1 < ΣCT / TTL < 1 (In the above condition, ΣCT is the sum of the central thicknesses of the lenses, and TTL is the optical axis distance from the vertex of the object-side surface of the lens closest to the object side to the upper surface of the image sensor.)

[0021] In order to solve the above technical problem, an optical system according to the present embodiment includes first to eighth lenses arranged along an optical axis, wherein the first lens has positive (+) refractive power, the second lens has negative (-) refractive power, the fifth lens has positive (+) refractive power, the first lens is a first lens group having positive (+) refractive power, the second to fourth lenses are a second lens group having negative (-) refractive power, the fifth lens is a third lens group having positive (+) refractive power, and the sixth to eighth lenses are a fourth lens group having positive (+) refractive power.

[0022] The first lens group and the third lens group may be fixed groups, and the second lens group and the fourth lens group may be moving groups.

[0023] The second lens may have a concave shape on both sides, and the fifth lens may have a convex shape on both sides.

[0024] Among the first to eighth lenses, the effective diameter of the fifth lens may be the largest, and among the first to eighth lenses, the effective diameter of the eighth lens may be the smallest.

[0025] The following condition can be satisfied. <Condition> 6 < TTL / ImgH < 7 (In the above condition, TTL is the optical axis distance from the vertex of the object-side surface of the first lens to the upper surface of the image sensor, and ImgH is the maximum diagonal length of the image sensor.)

[0026] The optical system and camera module according to the embodiment can have various magnifications and can exhibit excellent optical characteristics when providing various magnifications. Specifically, the embodiment can control a lens group having a set number of lenses, a set refractive power, a plurality of lenses having a set shape and focal length, etc., a moving distance of a moving lens group, etc. to have various magnifications and can provide an autofocus (AF) function for the subject.

[0027] Additionally, the optical system and camera module according to the embodiment can each compensate for aberration characteristics of a plurality of lens groups or mutually complement aberration characteristics that change with movement. Accordingly, the optical system according to the embodiment can minimize or prevent changes in chromatic aberration and aberration characteristics that occur when magnification changes.

[0028] Additionally, the optical system and camera module according to the embodiment can control the effective focal length (EFL) by moving only some of the plurality of lens groups, thereby minimizing the moving distance of the moving lens groups. Accordingly, the embodiment can significantly reduce the moving distance of the lens groups when the magnification changes, and can minimize the power consumption required when moving the lens groups.

[0029] Additionally, the optical system and camera module according to the embodiment can adjust the magnification by moving a lens group other than the first lens group adjacent to the subject among the plurality of lens groups. Accordingly, the optical system can maintain a constant TTL value even when the lens group moves according to the change in magnification. Accordingly, the optical system and the camera module including the same can be provided with a slimmer structure.

[0030] Fig. 1 is a configuration diagram of an optical system according to the present embodiment operating in the first mode.

[0031] Figure 2 is a configuration diagram of an optical system according to the present embodiment operating in the third mode.

[0032] Fig. 3 is a table showing the aspherical coefficients of lenses in the optical system according to the present embodiment.

[0033] FIG. 4 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at room temperature of the optical system according to the present embodiment operating in the first mode.

[0034] Fig. 5 is a graph showing data on aberration characteristics of an optical system according to the present embodiment operating in the first mode.

[0035] Fig. 6 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at room temperature of the optical system according to the present embodiment operating in the second mode.

[0036] Fig. 7 is a graph showing data on aberration characteristics of an optical system according to the present embodiment operating in the second mode.

[0037] Fig. 8 is a graph showing data on the diffraction MTF (Modulation Transfer Function) at room temperature of the optical system according to the present embodiment operating in the third mode.

[0038] Fig. 9 is a graph showing data on aberration characteristics of an optical system according to the present embodiment operating in the third mode.

[0039] FIG. 10 is a graph showing data on relative illumination versus relative field according to the relative field height of the optical system according to the present embodiment.

[0040] Fig. 11 is an example of a vehicle having an optical system according to the present embodiment.

[0041] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0042] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0043] In addition, terms (including technical and scientific terms) used in this embodiment may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which this embodiment belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0044] Additionally, the terms used in this embodiment are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0045] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0046] Additionally, in describing the components of this embodiment, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

[0047] And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, it may include not only cases where the component is 'connected', 'coupled', or 'connected' directly to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.

[0048] Additionally, when described as being formed or arranged "above" or "below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," the meaning may include not only the upward direction but also the downward direction based on one component.

[0049] In the description of the invention, the "object side" may mean a surface of the lens facing the object side with respect to the optical axis (OA), and the "sensor side" may mean a surface of the lens facing the imaging surface (image sensor) with respect to the optical axis. The "object side" may be the "object side," and the "sensor side" may be the "image side." A convex surface of a lens may mean a convex shape in the optical axis or the paraxial region, and a concave surface of a lens may mean a concave shape in the optical axis or the paraxial region. The radius of curvature, the center thickness, and the optical axis spacing between lenses described in the table for lens data may mean values ​​(unit: mm) in the optical axis. The vertical direction may mean a direction perpendicular to the optical axis, and the end of a lens or lens surface may mean the end of an effective area of ​​a lens through which incident light passes. The size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method, etc. The above-mentioned near-axis region refers to a very narrow region near the optical axis, and is a region where the distance that a light ray falls from the optical axis (OA) is almost 0. Hereinafter, the meaning of the optical axis may include the center of each lens or a very narrow region near the optical axis.

[0050]

[0051] The optical system (1000) according to the present embodiment may include a plurality of lens groups. In detail, the optical system (1000) may include a plurality of lens groups each including at least one lens. For example, the optical system (1000) may include a first lens group (LG1), a second lens group (LG2), a third lens group (LG3), a fourth lens group (LG4), and an image sensor (300) that are sequentially arranged along the optical axis (OA) from the object side toward the image sensor.

[0052] Each of the first to fourth lens groups (LG1, LG2, LG3, LG4) can have positive (+) or negative (-) refractive power. In detail, the first lens group (LG1) and the second lens group (LG2) can have refractive powers of different signs. For example, the first lens group (LG1) can have positive (+) refractive power, and the second lens group (LG2) can have negative (-) refractive power. The second lens group (LG2) and the third lens group (LG3) can have refractive powers of different signs. For example, the second lens group (LG2) can have negative (-) refractive power, and the third lens group (LG3) can have positive (+) refractive power. The third lens group (LG3) and the fourth lens group (LG4) can have refractive powers of the same sign. For example, the third lens group (LG4) may have positive (+) refractive power, and the fourth lens group (LG4) may have positive (+) refractive power.

[0053] At least one of the first to fourth lens groups (LG1, LG2, LG3, LG4) may be provided to be movable in the direction of the optical axis (OA). In detail, at least two of the plurality of lens groups (LG1, LG2, LG3, LG4) may be provided to be movable, and the remaining lens groups may be fixed. The first lens group (LG1) and the third lens group (LG3) may be arranged at fixed positions, and the second lens group (LG2) and the fourth lens group (LG4) may be provided to be movable in the direction of the optical axis (OA). By setting the second lens group (LG2) and the fourth lens group (LG4) as movable groups, the stroke may be reduced.

[0054] The first lens group (LG1) may include multiple lenses. Specifically, the first lens group (LG1) may include one or more lenses having opposite refractive powers. For example, the first lens group (LG1) may include one lens.

[0055] The second lens group (LG2) may include multiple lenses. Specifically, the second lens group (LG2) may include two or more lenses having opposite refractive powers. The number of lenses included in the second lens group (LG2) may be greater than the number of lenses included in the first lens group (LG1). For example, the second lens group (LG2) may include three lenses.

[0056] The plurality of lenses included in the second lens group (LG2) may have a set interval. In detail, the interval between the plurality of lenses included in the second lens group (LG2) may be constant without changing in the operation mode described later. For example, the interval between the second lens (102) and the third lens (103) and the interval between the third lens (103) and the fourth lens (104, 204, 304) may be constant without changing in the operation mode described later.

[0057] The third lens group (LG3) may include multiple lenses. Specifically, the third lens group (LG3) may include one or more lenses having opposite refractive powers. For example, the third lens group (LG3) may include one lens.

[0058] The fourth lens group (LG4) may include multiple lenses. Specifically, the fourth lens group (LG4) may include two or more lenses with opposite refractive powers. For example, the fourth lens group (LG4) may include three lenses.

[0059] The plurality of lenses included in the fourth lens group (LG4) may have a set spacing. Specifically, the spacing between the plurality of lenses included in the fourth lens group (LG4) may be constant and not change in the operation mode described later. For example, the spacing between the sixth lens (106) and the seventh lens (107) and the spacing between the seventh lens (107) and the eighth lens (108) may be constant and not change in the operation mode described later.

[0060]

[0061] That is, the optical system (1000) may include a plurality of lens groups (LG1, LG2, LG3, LG4) and an image sensor (300) sequentially arranged from the object side toward the sensor. In addition, the optical system (1000) may include a plurality of lenses included in the lens groups (LG1, LG2, LG3, LG4), for example, a first lens (101), a second lens (102), a third lens (103), a fourth lens (104), a fifth lens (105), a sixth lens (106), a seventh lens (107), and an eighth lens (108).

[0062] The first lens group (LG1) may include the first lens (101). The second lens group (LG2) may include the second and fourth lenses (102-104). The third lens group (LG3) may include the fifth lens (105). The fourth lens group (LG4) may include the sixth to eighth lenses (106-108). The first to eighth lenses (101-108) and the image sensor (300) may be sequentially arranged along the optical axis (OA) of the optical system (1000).

[0063] Each of the plurality of lenses (100) may include an effective area and an ineffective area. The effective area may be an area through which light incident on each of the first to eighth lenses (101-108) passes. In other words, the effective area may be an area through which the incident light is refracted to implement optical characteristics.

[0064] The inactive area may be located around the active area. The inactive area may be an area where no light is incident. In other words, the inactive area may be an area unrelated to optical properties. Additionally, the inactive area may be an area fixed to a barrel (not shown) that accommodates the lens.

[0065] In the optical system (1000) according to the present embodiment, at least one of the first to eighth lenses (101-108) may be subjected to the D-cut technique. When the D-cut technique is applied, the height of the entire optical system may be reduced by cutting off a portion of the lens effective diameter or rib. Here, the height of the entire optical system may refer to the length in the direction perpendicular to the optical axis, not the TTL.

[0066] The image sensor (300) can detect light. The image sensor (300) can detect light that has sequentially passed through a plurality of lenses, for example, the first to eighth lenses (101-108). The image sensor (300) may include a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

[0067] In addition, the optical system (1000) may further include a filter (400). The filter (400) may be arranged between a plurality of lenses and the image sensor (300). The filter (400) may be arranged between the fourth lens group (LG4) closest to the image sensor (300) among the plurality of lens groups (LG1, LG2, LG3, LG4) and the image sensor (300). For example, the filter (400) may be arranged between the last lens of the third lens group (LG3) closest to the image sensor (300) among the plurality of lenses and the image sensor (300).

[0068] The filter (400) may include at least one optical filter, such as an infrared filter or a cover glass. The filter (400) may allow light of a set wavelength band to pass through and filter out light of a different wavelength band. When the filter (400) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (300). In addition, the filter (400) may transmit visible light and reflect infrared light.

[0069] The optical system (1000) may include an aperture (not shown). The aperture may control the amount of light incident on the optical system (1000).

[0070] The aperture may be arranged between lens groups. The aperture may be arranged between the second lens group (LG2) and the third lens group (LG3). The aperture may be arranged between the third lens group (LG3) and the fourth lens group (LG4). The aperture may be arranged on the sensor side of the fourth lens (104) that is arranged closest to the sensor side of the second lens group (LG2). The aperture may be arranged on the object side of the sixth lens (106) that is arranged closest to the object side of the fourth lens group (LG4).

[0071] The aperture may be positioned in front of the first lens (101) or may be arranged between two lenses selected from the first to eighth lenses (101-108). For example, the aperture may be arranged between the fourth lens (104) and the fifth lens (105). The aperture may be arranged between the fifth lens (105) and the sixth lens (106). In addition, at least one lens from the first to eighth lenses (101-108) may function as an aperture. For example, the object-side surface or the sensor-side surface of one lens selected from the first to eighth lenses (101-108) may function as an aperture for controlling the amount of light.

[0072]

[0073] An optical system according to the present embodiment of the invention will be described.

[0074] FIG. 1 is a configuration diagram of an optical system according to an embodiment of the present invention operating in a first mode, FIG. 2 is a configuration diagram of an optical system according to an embodiment of the present invention operating in a third mode, FIG. 3 is a table showing aspherical coefficients of lenses in an optical system according to an embodiment of the present invention, FIG. 4 is a graph showing data on a diffraction MTF (Modulation Transfer Function) at room temperature of an optical system according to an embodiment of the present invention operating in a first mode, FIG. 5 is a graph showing data on aberration characteristics of an optical system according to an embodiment of the present invention operating in a first mode, FIG. 6 is a graph showing data on a diffraction MTF (Modulation Transfer Function) at room temperature of an optical system according to an embodiment of the present invention operating in a second mode, FIG. 7 is a graph showing data on aberration characteristics of an optical system according to an embodiment of the present invention operating in a second mode, FIG. 8 is a graph showing data on a diffraction MTF (Modulation Transfer Function) at room temperature of an optical system according to an embodiment of the present invention operating in a third mode, and FIG. 9 is a graph showing data on aberration characteristics of an optical system according to an embodiment of the present invention operating in a third mode, and 10 is a graph showing data on relative illumination versus relative field according to the relative field height of the optical system according to the present embodiment.

[0075] Referring to FIG. 1, the optical system (1000) includes a lens unit (100), and the lens unit (100) may include a first lens (101) to an eighth lens (108). The first to eighth lenses (101-108) may be sequentially arranged along the optical axis (OA) of the optical system (1000). Light corresponding to information about an object may pass through the first to eighth lenses (101-108) and a filter (400) and be incident on the image sensor (300).

[0076] The first lens (101) may be positioned closest to the object side. The first lens (101) may be positioned furthest from the sensor side. The first lens (101) may have positive (+) refractive power on the optical axis (OA). The first lens (101) may include a plastic material or a glass material, and may be, for example, a plastic material.

[0077] The first lens (101) may be a prism lens. The first lens (101) can rotate the optical path by 90 degrees. The first lens (10) includes an incident surface (S1) on which light is incident, a reflective surface (RS1) that reflects the incident light, and an exit surface (S2) that emits the reflected light. The reflective surface (RS1) has an inclination angle of 45 degrees and reflects the principal ray of the incident light at 90 degrees, thereby reflecting the incident light to the second lens (102). By changing the direction of the incident light to the second lens (20), the total length of the imaging lens can be reduced.

[0078] The object-side first surface (S1) of the first lens (101) may be formed as a plane, and the sensor-side second surface (S2) may be formed as a convex surface. Conversely, the object-side first surface (S1) of the first lens (101) may be convex, and the sensor-side second surface (S2) may be formed as a plane.

[0079]

[0080] The second lens (102) may be arranged second from the object side. The second lens (102) may be arranged seventh from the sensor side. The second lens (102) may be arranged between the first lens (101) and the third lens (103). The second lens (102) may have negative (-) refractive power in the optical axis (OA). The second lens (102) may have different refractive power from the first lens (101) in the optical axis (OA). The second lens (102) may include a plastic or glass material. For example, the second lens (102) may be provided as a plastic material.

[0081] The object-side third surface (S3) of the second lens (102) with respect to the optical axis (OA) may be concave, and the sensor-side fourth surface (S4) may be concave. The second lens (102) may have a concave shape on both sides. The second lens (102) may be made of a plastic material and may have an aspherical surface. The aspherical coefficients of the third and fourth surfaces (S3, S4) may be provided as L2S1 and L2S2 of FIG. 3. At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (102) may be provided without a critical point from the optical axis to the end of the effective area.

[0082]

[0083] The third lens (103) may be arranged third from the object side. The third lens (103) may be arranged sixth from the sensor side. The third lens (103) may be arranged between the second lens (102) and the fourth lens (104). The third lens (103) may have negative (-) refractive power on the optical axis (OA). The third lens (103) may include a plastic or glass material. For example, the third lens (103) may be provided as a plastic material.

[0084] The fifth surface (S5) on the object side of the third lens (103) with respect to the optical axis may be concave, and the sixth surface (S6) on the sensor side may be concave. The third lens (103) may have a shape in which both sides are concave with respect to the optical axis (OA). The third lens (103) may be made of a plastic material and may have an aspherical surface. The aspherical coefficients of the fifth and sixth surfaces (S5, S6) may be provided as L3S1 and L3S2 of FIG. 3. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (103) may be provided without a critical point from the optical axis to the end of the effective area.

[0085]

[0086] The fourth lens (104) may be arranged as the fourth lens from the object side. The fourth lens (104) may be arranged as the fifth lens from the sensor side. The fourth lens (104) may be arranged between the third lens (103) and the fifth lens (105). The fourth lens (104) may have positive refractive power. The fourth lens (104) may include a plastic or glass material. For example, the fourth lens (104) may be provided as a plastic material.

[0087] The seventh surface (S7) on the object side of the fourth lens (104) with respect to the optical axis may be convex, and the eighth surface (S8) on the sensor side may be convex. The fourth lens (104) may have a shape in which both sides are convex. The fourth lens (104) is made of a plastic material and may have an aspherical surface. The aspherical coefficients of the seventh and eighth surfaces (S7, S8) may be provided as L4S1 and L4S2 of FIG. 3. At least one or both of the seventh surface (S7) and the eighth surface (S8) of the fourth lens (104) may be provided without a critical point from the optical axis to the end of the effective area.

[0088]

[0089] The aperture (Stop) may be arranged between the sensor-side lens of the second lens group (LG2) and the object-side lens of the third lens group (LG3). The aperture (Stop) may be arranged between the fourth lens (104) and the fifth lens (105). The aperture (Stop) may be arranged between the sensor-side lens of the third lens group (LG3) and the object-side lens of the fourth lens group (LG4). The aperture (Stop) may be arranged between the fifth lens (105) and the sixth lens (106). The aperture can reduce the TTL within the field of view range, enabling miniaturization of the optical system. Accordingly, a decrease in the yield by weight of the optical system can be prevented, and production efficiency can be improved. In addition, the optical system can be miniaturized by reducing the TTL within the horizontal field of view (FOV_H) of 10 to 30 degrees.

[0090]

[0091] The fifth lens (105) may be arranged as the fifth lens from the object side. The fifth lens (105) may be arranged as the fourth lens from the sensor side. The fifth lens (105) may be arranged between the fourth lens (104) and the sixth lens (106). The fifth lens (105) may have positive (+) or negative (-) refractive power on the optical axis (OA). The fifth lens (105) may have positive (+) refractive power. The fifth lens (105) may include a plastic or glass material. For example, the fifth lens (105) may be provided as a plastic material.

[0092] With respect to the optical axis (OA), the ninth surface (S9) on the object side of the fifth lens (105) may be convex, and the tenth surface (S10) on the sensor side may be convex. The fifth lens (105) may have a shape in which both sides are convex. The fifth lens (105) may be made of a plastic material and may have an aspherical surface. The aspherical coefficients of the ninth and tenth surfaces (S9, S10) may be provided as L5S1 and L5S2 of FIG. 3. At least one or both of the ninth surface (S9) and the tenth surface (S10) of the fifth lens (105) may be provided without a critical point from the optical axis to the end of the effective area.

[0093]

[0094] The sixth lens (106) may be arranged as the sixth lens from the object side. The sixth lens (106) may be arranged as the third lens from the sensor side. The sixth lens (106) may be arranged between the fifth lens (105) and the seventh lens (107). The sixth lens (106) may have positive (+) or negative (-) refractive power on the optical axis (OA). The sixth lens (106) may have positive (+) refractive power. The sixth lens (106) may include a plastic or glass material. For example, the sixth lens (106) may be provided as a plastic material.

[0095] With respect to the optical axis (OA), the object-side eleventh surface (S11) of the sixth lens (106) may be convex, and the sensor-side twelfth surface (S12) may be convex. The sixth lens (106) may have a convex shape on both sides. The sixth lens (106) may be made of a plastic material and may have an aspherical surface. The aspherical coefficients of the eleventh and twelfth surfaces (S11, S12) may be provided as L6S1, L6S2 of FIG. 3. At least one or both of the eleventh surface (S11) and the twelfth surface (S12) of the sixth lens (106) may be provided without a critical point from the optical axis to the end of the effective area.

[0096]

[0097] The seventh lens (107) may be arranged as the seventh lens from the object side. The seventh lens (107) may be arranged as the second lens from the sensor side. The seventh lens (107) may be arranged between the sixth lens (106) and the eighth lens (108). The seventh lens (107) may have positive (+) or negative (-) refractive power on the optical axis (OA). The seventh lens (107) may have negative (-) refractive power. The seventh lens (107) may include a plastic or glass material. For example, the seventh lens (107) may be provided as a plastic material.

[0098] With respect to the optical axis (OA), the 13th surface (S13) on the object side of the seventh lens (107) may be concave, and the 14th surface (S14) on the sensor side may be concave. The seventh lens (107) may have a concave shape on both sides. The seventh lens (107) may be made of a plastic material and may have an aspherical surface. The aspherical coefficients of the 13th and 14th surfaces (S13, S14) may be provided as L7S1 and L7S2 of FIG. 3. At least one or both of the 13th surface (S13) and the 14th surface (S14) of the seventh lens (107) may be provided without a critical point from the optical axis to the end of the effective area.

[0099]

[0100] The eighth lens (108) may be positioned closest to the sensor side. The eighth lens (108) may be positioned furthest from the object side. The eighth lens (108) may have positive refractive power. The eighth lens (108) may include a plastic or glass material. For example, the eighth lens (108) may be provided as a plastic material.

[0101] With respect to the optical axis (OA), the 15th surface (S15) on the object side of the 8th lens (108) may be convex, and the 16th surface (S16) on the sensor side may be concave. The 8th lens (108) may have a meniscus shape that is convex toward the object side. At least one or both of the 15th surface (S15) and the 16th surface (S16) may be aspherical. The aspherical coefficients of the 15th and 16th surfaces (S15, S16) may be provided as L8S1 and L8S2 of FIG. 3.

[0102]

[0103] LensSurfaceRadiusThicknessndvdSemiAperture1S1Infinity5.3001.53155.7534.80S2-28.7291Variable(D1) 4.402S3-19.29810.4001.63623.8913.10S465.56040.783 3.003S5-8.73860.4191.53155.7533.00S612.71230.144 3.104S712.60550.6931.67119.2373.15S8-425.5418 Variable (D2) 3.155S917.39030.9041.53155.7533.40S10-20.6071Variable(D3) 3.456S115.61612.5101.53155.7533.30S12-7.04150.1003.157S13-8.77062.4941.63623.8913.05S147.17013.5242.508S155.63372.4831.67119.2372.60S166.0256Variable(D4)2.30FilterInfinity0.420Infinity1.000ImageInfinity2.52

[0104] Table 1 shows the surface number (Surface), radius of curvature (Radius), center thickness of each lens or distance between lens surfaces (Thickness), refractive index (Index,nd), Abbe number (Abbe,vd), effective radius (Semi Aperture), and focal length (Focal length) of the lens according to the present embodiment of the present invention. At this time, the unit of the radius of curvature and thickness or distance may be mm.

[0105]

[0106] widemiddleteleD10.7443.8365.529D24.8891.7970.104D33.9521.9230.100D43.5415.5707.393

[0107] Table 2 shows the distances (D1, D2, D3) between lenses that are variable when the optical system according to the present embodiment of the present invention operates in any one of the first to third modes. Here, the first mode may refer to a wide-angle end, the second mode may refer to a middle end, and the third mode may refer to a telephoto end. The wide-angle end may be referred to as a wide angle, and the telephoto end may be referred to as a telephoto.

[0108] In the optical system according to the present embodiment of the present invention, the distance between adjacent lens groups may change during the process of changing the magnification from the first mode to the third mode. The first and third lens groups (LG1, LG3) are fixed, and only the second and fourth lens groups (LG2, LG4) can move. The first and third lens groups (LG1, LG3) may be fixed groups, and the second and fourth lens groups (LG2, LG4) may be movable groups.

[0109] When operating from the first mode to the second mode, the distance (D1) between the first lens group (LG1) and the second lens group (LG2) may increase, the distance (D2) between the second lens group (LG2) and the third lens group (LG3) may decrease, the distance (D3) between the third lens group (LG3) and the fourth lens group (LG4) may decrease, and the distance (D4) between the fourth lens group (LG4) and the filter (400) may increase.

[0110] When operating from the second mode to the third mode, the distance (D1) between the first lens group (LG1) and the second lens group (LG2) may increase, the distance (D2) between the second lens group (LG2) and the third lens group (LG3) may decrease, the distance (D3) between the third lens group (LG3) and the fourth lens group (LG4) may decrease, and the distance (D4) between the fourth lens group (LG4) and the filter (400) may increase.

[0111] When operating from the first mode to the third mode, the distance (D1) between the first lens group (LG1) and the second lens group (LG2) may increase, the distance (D2) between the second lens group (LG2) and the third lens group (LG3) may decrease, the distance (D3) between the third lens group (LG3) and the fourth lens group (LG4) may decrease, and the distance (D4) between the fourth lens group and the filter (400) may increase.

[0112] The stroke length of the second lens group (LG2) can satisfy 4 mm to 5 mm, and preferably, can satisfy about 4.785 mm. The stroke length of the fourth lens group (LG4) can satisfy 3 mm to 4 mm, and preferably, can satisfy about 3.852 mm. The stroke length of the second lens group (LG2) can be greater than the stroke length of the fourth lens group (LG4). The second lens group (LG2) and the fourth lens group (LG4) can move at different speeds. The moving speed of the fourth lens group (LG4) can be greater than the moving speed of the second lens group (LG2). In the present embodiment, the magnification of the wide-angle end and the telephoto end can satisfy a range of 1.5 to 2 times, and can satisfy a magnification of about 1.86 times.

[0113]

[0114] EFL(f)_wide10.400EFL(f)_tele19.400BFL_wide4.961BFL_tele8.813EPD_wide4.442EPD_tele6.162SD_wide16.072SD_tele22.288Fno_wide 2.3412Fno_tele3.1482 HFOV_wide13.823HFOV_tele7.294f154.090f_LG154.090f2-23.418f_LG2-11.016f3-9.685f_LG317.900f418.246f_LG416.860f517.905LG2_stroke4.785 f66.317LG4_stroke 3.852f7-5.852TTL34.3 f836.388ImgH5.040ET15.104CA_Max9.2ET20.700CA_Min4.9ET31.285CA_Aver6.43ET40.337L_CT_max5.300ET50.300L_CT_min0.400ET60.954L_CT_aver1.900ET73.375TD_LG15.30ET82.336TD_LG22.44ΣCT15.203TD_LG30.90ΣCG12.106TD_LG411.11

[0115] Table 3 shows the items of the mathematical formulas described above in the optical system (1000) of the present embodiment, and the effective focal length (F) (mm), BFL (Back Focal Length) (mm), EPD (mm), SD (mm), Fno, HFOV (degree) which is the optical axis distance from the aperture (STOP) to the 16th surface (S16) at each of the wide-angle end and the telephoto end of the optical system (1000), and the focal lengths (f1-f8) (mm), edge thicknesses (ET1-ET8) of the first to eighth lenses (101-108), the focal lengths (f_LG1, f_LG2, f_LG3, f_LG4) (mm) of the first to fourth lens groups (LG1, LG2, LG3, LG4), the stroke length (LG2_stroke) of the second lens group (LG2), and the stroke of the fourth lens group (LG4). The length (G4_stroke), the total optical axis distance of the optical system (1000) TTL (mm), ImgH (mm), maximum effective diameter (CA_Max), minimum effective diameter (CA_Min), average effective diameter (CA_Aver), maximum center thickness (L_CT_max), minimum center thickness (L_CT_min), average center thickness (L_CT_aver) among the first to eighth lenses (101-108), and the length of each lens group in the optical axis direction (TD_LG1, TD_LG2, TD_LG3, TD_LG4) are as follows.

[0116]

[0117] The center thicknesses of the first to eighth lenses (101 to 108) are represented by CT1 to CT8, the edge thicknesses at the ends of the effective areas of each lens are represented by ET1 to ET8, the center gap between two adjacent lenses is represented by CG1 to CG7, and the edge gaps between the edges of each lens are represented by EG1 to EG7. The BFL (Back focal length) is the optical axis distance from the image sensor (300) to the center of the last lens. The TTL is the optical axis distance from the center of the first surface (S1) of the first lens (101) to the upper surface of the image sensor (300).

[0118]

[0119] When comparing the absolute values ​​of the curvature radii of each lens, the curvature radii of the eighth surface (S8) of the fourth lens (104) on the optical axis (OA) may be the largest among the lenses, and the curvature radii of the eleventh surface (S11) of the sixth lens (106) may be the smallest among the lenses. The absolute value of the curvature radii of the first surface (S1) of the first lens (101) may be larger than the absolute value of the curvature radii of the second surface (S2). The absolute value of the curvature radii of the third surface (S3) of the second lens (102) may be smaller than the absolute value of the curvature radii of the fourth surface (S4). The absolute value of the curvature radii of the fifth surface (S5) of the third lens (103) may be smaller than the absolute value of the curvature radii of the eighth surface (S8). The absolute value of the curvature radius of the seventh surface (S7) of the fourth lens (104) may be smaller than the absolute value of the curvature radius of the eighth surface (S8). The absolute value of the curvature radius of the ninth surface (S9) of the fifth lens (105) may be smaller than the absolute value of the curvature radius of the tenth surface (S10). The absolute value of the curvature radius of the eleventh surface (S11) of the sixth lens (106) may be smaller than the absolute value of the curvature radius of the twelfth surface (S12). The absolute value of the curvature radius of the thirteenth surface (S13) of the seventh lens (107) may be larger than the absolute value of the curvature radius of the fourteenth surface (S14). The absolute value of the curvature radius of the fifteenth surface (S15) of the eighth lens (108) may be smaller than the absolute value of the curvature radius of the sixteenth surface (S16).

[0120] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0121] Condition 1: 0.1 < |L2R1 / L2R2| < 0.5

[0122] Condition 2: 0.5 < |L3R1 / L3R2| < 1

[0123] Condition 3: 0.01 < |L4R1 / L4R2| < 0.05

[0124] Condition 4: 0.5 < |L5R1 / L5R2| < 1

[0125] Condition 5: 0.5 < L6R1 / L6R2 < 1

[0126] Condition 6: 1 < L7R1 / L7R2 < 1.5

[0127] Condition 7: 0.5 < L8R1 / L8R2 < 1

[0128]

[0129] When describing the central thickness of the lenses based on the optical axis, the central thickness of the first lens (101) is the largest among the lenses, and the central thickness (CT2) of the second lens (102) is the smallest among the lenses. The difference between the maximum and minimum central thicknesses among the lenses may be in the range of 4 mm or more and 6 mm or less.

[0130] The central thickness of each lens may satisfy any one of the following conditions:

[0131] Condition 1: CT1 > CT2, CT3, CT4, CT5, CT6, CT7, CT8

[0132] Condition 2: CT1, CT3, CT4, CT5, CT6, CT7, CT8 > CT2

[0133] Condition 3: CT1, CT4, CT5, CT6, CT7, CT8 > CT3 > CT2

[0134] Condition 4: CT1, CT5, CT6, CT7, CT8 > CT4 > CT2, CT3

[0135] Condition 5: CT1, CT6, CT7, CT8 > CT5 > CT2, CT3, CT4

[0136] Condition 6: CT1 > CT6 > CT2, CT3, CT4, CT5, CT7, CT8

[0137] Condition 7: CT1, CT6 > CT7 > CT2, CT3, CT4, CT5, CT8

[0138] Condition 8: CT1, CT6, CT7 > CT8 > CT2, CT3, CT4, CT5

[0139]

[0140] When zooming, the distance (CG2) between the second lens (102) and the third lens (103), the distance (CG3) between the third lens (103) and the fourth lens (104), the distance (CG6) between the sixth lens (106) and the seventh lens (107), and the distance (CG7) between the seventh lens (107) and the eighth lens (108) do not change, while the distance (CG1) between the first lens (101) and the second lens (102), the distance (CG4) between the fourth lens (104) and the fifth lens, and the distance (CG5) between the fifth lens (105) and the sixth lens (106) can change. Among the center distances between the lenses that do not change, the center distance (CG7) between the seventh lens (107) and the eighth lens (108) may be the maximum, and the center distance (CG6) between the sixth and seventh lenses (106, 107) may be the minimum. The difference between the maximum center spacing and the minimum center spacing among the lens spacings may be 3 mm or more, for example, in the range of 3.2 mm to 4 mm.

[0141] The center spacing between each lens can satisfy the following conditions.

[0142] Condition 1: CG7 > CG2 > CG3, CG6

[0143] Condition 2: CG2, CG7 > CG3 > CG6

[0144] Condition 3: CG2, CG3, CG7 > CG6

[0145] Condition 4: CG7 > CG2, CG3, CG6

[0146]

[0147] In terms of the effective diameter, the lens having the maximum effective diameter may be the first lens (101). Here, the effective diameter is the average of the effective diameters on the object side and the sensor side of each lens. The lens surface having the maximum effective diameter may be the first surface (S1) of the first lens (101). The lens having the minimum effective diameter may be the eighth lens (108). The lens surface having the minimum effective diameter may be the sixteenth surface (S16) of the eighth lens (108).

[0148] The effective diameters of the first to sixth lenses (101-106) may be larger than the diagonal length of the image sensor (300). The average effective diameters of the seventh to eighth lenses (107-108) may be smaller than the diagonal length of the image sensor (300). Accordingly, light incident through a plurality of lenses aligned along the optical axis can be guided to the image sensor (300).

[0149] The effective diameter of each lens can satisfy any one of the conditions below.

[0150] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7, CA_L8

[0151] Condition 2: CA_L1, CA_L4, CA_L5, CA_L6 > CA_L2 > CA_L7, CA_L8

[0152] Condition 3: CA_L1, CA_L4, CA_L5, CA_L6 > CA_L3 > CA_L7, CA_L8

[0153] Condition 4: CA_L1, CA_L5, CA_L6 > CA_L4 > CA_L2, CA_L3, CA_L7, CA_L8

[0154] Condition 5: CA_L1 > CA_L5 > CA_L2, CA_L3, CA_L4, CA_L6, CA_L7, CA_L8

[0155] Condition 6: CA_L1, CA_L5 > CA_L6 > CA_L2, CA_L3, CA_L4, CA_L7, CA_L8

[0156] Condition 7: CA_L1, CA_L2, CA_L3, CA_L4, CA_L5, CA_L6 > CA_L7 > CA_L8

[0157] Condition 8: CA_L1, CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7 > CA_L8

[0158]

[0159] When explaining the refractive index, the refractive index of the fourth lens (104) and the eighth lens (108) may be the largest among the lenses and may be greater than 1.6, for example, greater than 1.65. Any one or all of the first lens (101), the third lens (103), the fifth lens (105), and the sixth lens (106) may have the smallest refractive index among the lenses. For example, the refractive index of the first lens (101), the third lens (103), the fifth lens (105), and the sixth lens (106) may be the smallest among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be 0.13 or more.

[0160] The refractive index of each lens can satisfy any of the conditions below.

[0161] Condition 1: n2, n4, n7, n8 > n1 = n3 = n5 = n6

[0162] Condition 2: n4, n8 > n2 = n7 > n1, n3, n5, n6

[0163] Condition 3: n4 = n8 > n1, n2, n3, n5, n6, n7

[0164]

[0165] Comparing the Abbe numbers, the Abbe number of any one of the first lens (101), the third lens (103), the fifth lens (105), and the sixth lens (106) is the largest among the lenses and may be 50 or more. The Abbe numbers of the fourth lens (104) and the eighth lens (108) are the smallest among the lenses and may be 25 or less. The difference between the maximum refractive index and the minimum Abbe number may be 30 or more.

[0166] The Abbe number of each lens can satisfy any of the conditions below.

[0167] Condition 1: v1 = v3 = v5 = v6 > v2, v4, v7, v8

[0168] Condition 2: v1, v3, v5, v6 > v7 = v2 > v4, v8

[0169] Condition 3: v1, v2, v3, v5, v6, v7 > v4 = v8

[0170]

[0171] The focal lengths (F1, F3, F5) of the first, third, and fifth lenses (101, 103, and 105) may have positive (+) signs. The first, third, and fifth lenses (101, 103, and 105) may have positive (+) refractive power. The focal lengths (F2, F4, and F6) of the second, fourth, and sixth lenses (102, 104, and 106) may have negative (-) signs. The second, fourth, and sixth lenses (102, 104, and 106) may have negative (-) refractive power.

[0172] When comparing the focal lengths in absolute values, the focal length of the fifth lens (105) is the largest among the lenses, and may be 100 or more and 110 or less. The focal length of the third lens (103) is the smallest among the lenses, and the absolute value of the focal length of the third lens (103) may be 3 or more and 5 or less.

[0173] The absolute value of the focal length of each lens can satisfy any of the conditions below.

[0174] Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|, |f8|

[0175] Condition 1: |f1|, |f8| > |f2| > |f3|, |f4|, |f5|, |f6|, |f7|

[0176] Condition 1: |f1|, |f2|, |f4|, |f5|, |f8| > |f3| > |f6|, |f7|

[0177] Condition 1: |f1|, |f2|, |f8| > |f4| > |f3|, |f5|, |f6|, |f7|

[0178] Condition 1: |f1|, |f2|, |f4|, |f8| > |f5| > |f3|, |f6|, |f7|

[0179] Condition 1: |f1|, |f2|, |f3|, |f4|, |f5|, |f8| > |f6| > |f7|

[0180] Condition 1: |f1|, |f2|, |f3|, |f4|, |f5|, |f6|, |f8| > |f7|

[0181] Condition 1: |f1| > |f8| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

[0182]

[0183] The composite focal length (f_LG1) of the first lens group (LG1) may have a positive (+) sign. The first lens group (LG1) may have positive (+) composite refractive power. The composite focal length (f_LG2) of the second lens group (LG2) may have a negative (-) sign. The second lens group (LG2) may have negative (-) composite refractive power. The composite focal length (f_LG3) of the third lens group (LG3) may have a positive (+) sign. The third lens group (LG3) may have positive (+) composite refractive power. The composite focal length (f_LG4) of the fourth lens group (G4) may have a positive (+) sign. The fourth lens group (G4) may have positive (+) composite refractive power. Through this, light incident from the object side can move away from the optical axis direction and then gather again in the optical axis direction, thereby forming a stable optical path.

[0184] When comparing the absolute values ​​of the composite focal lengths of the first to fourth lens groups (LG1, LG2, LG3, LG4), the composite focal length of the first lens group (LG1) may be the largest, and the composite focal length of the second lens group (LG2) may be the smallest. The relationship between the composite focal lengths of the first to fourth lens groups (LG1, LG2, LG3, LG4) may satisfy |f_LG1| > |f_LG3| > |f_LG4| > |f_LG2|.

[0185]

[0186] The thickness (CT1) of the first lens (101) may be a difference of at least 1 time between the maximum thickness and the minimum thickness, for example, 1 to 1.5 times, and the center thickness (CT1) may be the maximum and the edge thickness (ET1) may be the minimum. The thickness (T2) of the second lens (102) may be a maximum thickness in a range of 1.5 to 2 times the minimum thickness. The second lens (102) may have a minimum center thickness (CT2) and a maximum edge thickness (ET2). The thickness (T3) of the third lens (103) may be minimum at the center and maximum at the edge, and the maximum thickness is in a range of 3 to 3.5 times the minimum thickness. The thickness (T4) of the fourth lens (104) may be maximum at the center and minimum at the edge, and the maximum thickness is in a range of 2 to 2.5 times the minimum thickness. The thickness (T5) of the fifth lens (105) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 3 to 3.5 times the minimum thickness. The thickness (T6) of the sixth lens (106) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 2.5 to 3 times the minimum thickness. The thickness (T7) of the seventh lens (107) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T8) of the eighth lens (108) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness.

[0187]

[0188] The thickness of each lens can satisfy any of the conditions below.

[0189] Condition 1: 1 < CT1 / ET1 < 1.5, 0.5 < ET1 / CT1 < 1

[0190] Condition 2: 0.5 < CT2 / ET2 < 1, 1.5 < ET2 / CT2 < 2

[0191] Condition 3: 0.1 < CT3 / ET3 < 0.5, 3 < ET3 / CT3 < 3.5

[0192] Condition 4: 2 < CT4 / ET4 < 2.5, 0.1 < ET4 / CT4 < 0.5

[0193] Condition 5: 3 < CT5 / ET5 < 3.5, 0.1 < ET5 / CT5 < 0.5

[0194] Condition 6: 2.5 < CT6 / ET6 < 3, 0.1 < ET6 / CT6 < 0.5

[0195] Condition 7: 0.5 < CT7 / ET7 < 1, 1 < ET7 / CT7 < 1.5

[0196] Condition 8: 1 < CT8 / ET8 < 1.5, 0.5 < ET8 / CT8 < 1

[0197] Condition 9: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0198]

[0199] Among the gaps (G1-G7) between the lenses, the gap (LG1) between the first and second lenses (101, 102) may have a maximum in the center and a minimum in the edge. The gap (LG2) between the second and third lenses (102, 103) may have a minimum in the edge and a maximum in the center. The gap (LG3) between the third and fourth lenses (103, 104) may have a maximum in the edge and a minimum in the center. The gap (G4) between the fourth and fifth lenses (104, 105) may have a maximum in the edge and a minimum in the center. The fifth gap (G5) between the fifth and sixth lenses (105, 106) may have a minimum in the center and a maximum in the edge. The sixth gap (G6) between the sixth and seventh lenses (106, 107) may have a minimum in the center and a maximum in the edge. The seventh gap (G7) between the seventh and eighth lenses (107, 108) may be maximum at the center and minimum at the edge.

[0200]

[0201] FIGS. 4, 6, and 8 are graphs showing the diffraction MTF (Modulation Transfer Function) at the wide, mid, and telephoto ends of the optical system according to the present embodiment, and are graphs showing the modulation ratio according to the spatial frequency. As shown in FIGS. 4, 6, and 8, in the present embodiment of the invention, the deviation of the MTF at low or high temperature based on the mid end may be less than 10%, that is, 7% or less.

[0202] FIGS. 5, 7, and 9 are graphs showing aberration characteristics at the wide, mid, and telephoto ends in the optical system according to the present embodiment. In the aberration graphs of FIGS. 5, 7, and 9, spherical aberration (longitudinal spherical aberration), astigmatic field curves, and distortion are measured from left to right. In FIGS. 5, 7, and 9, the X-axis may represent the focal length (mm) and the degree of distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in wavelength bands of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graphs for astigmatism and distortion are graphs for light in wavelength bands of about 546 nm. In the aberration diagrams of FIGS. 5, 7, and 9, the closer the curves at the wide, mid, and telephoto ends are to the Y-axis, the better the aberration correction function can be interpreted. It can be seen that the optical system (1000) according to the present embodiment has measured values ​​close to the Y-axis in almost all areas. That is, the optical system (1000) according to the present embodiment has improved resolution and can have good optical performance not only in the center of the field of view (FOV) but also in the periphery.

[0203]

[0204] The optical system (1000) according to the present embodiment disclosed above can satisfy at least one or two or more of the mathematical equations described below. Accordingly, the optical system (1000) according to the present embodiment can have improved optical characteristics. For example, when the optical system (1000) satisfies at least one mathematical equation, the optical system (1000) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can have good optical performance not only at the center but also at the periphery of the field of view (FOV). In addition, the optical system (1000) can have improved resolution. In addition, the thickness of the lens on the optical axis (OA) described in the mathematical equations and the spacing between adjacent lenses on the optical axis (OA) may refer to the present embodiment disclosed above.

[0205]

[0206] [Mathematical Formula 1]

[0207] 2 < TD_LG1 / TD_LG2 < 3

[0208] Mathematical expression 1 can establish a relationship between the length (TD_LG1) of the first lens group (LG1) in the optical axis direction and the length (TD_LG2) of the second lens group (LG2) in the optical axis direction. Mathematical expression 1 is a condition for reducing aberration and improving optical performance.

[0209] The first lens group (LG1) and the second lens group (LG2) satisfying mathematical expression 1 can appropriately correct astigmatism and coma aberration. In addition, the zoom optical system has a zoom magnification of approximately 2 times and can reduce the overall length of the optical system. In the present embodiment, mathematical expression 1 can preferably satisfy 2 < TD_LG1 / TD_LG2 < 2.5.

[0210]

[0211] [Equation 2]

[0212] 0.1 < TD_LG2 / TD_LG4 < 0.5

[0213] Mathematical expression 2 can establish a relationship between the length (TD_LG2) of the second lens group (LG2) in the optical axis direction and the length (TD_LG4) of the fourth lens group (LG4) in the optical axis direction. Mathematical expression 2 is a condition for reducing aberration and improving optical performance.

[0214] The second lens group (LG2) and the fourth lens group (LG4) satisfying mathematical expression 2 can appropriately correct astigmatism and coma aberration. In addition, the zoom optical system has a zoom magnification of approximately 2 times and can reduce the overall length of the optical system. In the present embodiment, mathematical expression 2 can preferably satisfy 0.1 < TD_LG2 / TD_LG4 < 0.3.

[0215]

[0216] [Equation 3]

[0217] 3 < BFL_Min < 5

[0218] In mathematical expression 3, BFL is the optical axis distance from the image sensor (300) to the center of the sensor side of the last lens. When mathematical expression 3 is satisfied, the installation space of the filter (400) and the cover glass (400) can be secured, the assembling of the components can be improved through the gap between the image sensor (300) and the last lens, and the joining reliability can be improved. In the present embodiment, mathematical expression 3 can preferably satisfy 4 < BFL_Min < 5. When the BFL is less than the range of mathematical expression 3, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may cause a decrease in resolution. When the BFL exceeds the range of mathematical expression 3, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0219]

[0220] [Equation 4]

[0221] 30 < Ave_ABV < 40

[0222] In mathematical expression 4, Ave_ABV is the average Abbe number of the lenses included in the optical system (1000). When mathematical expression 4 is satisfied, optical performance can be improved by appropriately setting factors affecting chromatic aberration. In the present embodiment, mathematical expression 4 can preferably satisfy 35 < Ave_ABV < 40.

[0223]

[0224] [Equation 5]

[0225] 1.5 < Ave_Ind < 1.8

[0226] In mathematical expression 5, Ave_Ind is the average refractive index of the lenses included in the optical system (1000). When mathematical expression 5 is satisfied, optical performance can be improved by appropriately setting factors affecting chromatic aberration. In the present embodiment, mathematical expression 4 preferably satisfies 1.5 < Ave_Ind < 1.65.

[0227]

[0228] [Equation 6]

[0229] 0.5 < |L5R1 / L5R2| < 1

[0230] Mathematical expression 6 can set the relationship between the object-side curvature radius (L5R1) of the fifth lens (105) and the sensor-side curvature radius (L5R2). By appropriately setting the lens surface shape of the fifth lens (105) arranged in the central region of the optical system (1000), it can serve to gather light. In this embodiment, Mathematical expression 6 can preferably satisfy 0.7 < |L5R1 / L5R2| < 0.9.

[0231]

[0232] [Equation 7]

[0233] 1 < CT6 / CT5 < 3

[0234] Mathematical expression 7 can set the relationship between the central thickness (CT5) of the fifth lens (105) and the central thickness (CT6) of the sixth lens (106). It can set the thickness relationship between the fifth lens (105), which is the last lens of the third lens group (LG3) of the fixed group, and the sixth lens (106), which is the first lens of the fourth lens group (LG4) of the moving group.

[0235] If the upper limit of mathematical expression 7 is exceeded, the optical system size may become excessively large and the module assembly may be reduced. If the lower limit of mathematical expression 7 is lower, the optical system aberration removal performance may be reduced. In the present embodiment, mathematical expression 7 may preferably satisfy 2 < CT6 / CT5 < 3.

[0236]

[0237] [Equation 8]

[0238] 1.5 < f_tele / f_wide < 2

[0239] Mathematical expression 8 can establish the relationship between the total focal length (f_tele) of the optical system (1000) in the third mode, the telephoto end (tele), and the total focal length (f_wide) of the optical system (1000) in the first mode, the wide-angle end (wide). f_tele / f_wide can be referred to as the magnification ratio or zoom magnification of the zoom lens optical system. Mathematical expression 8 is a condition for limiting the zoom optical performance.

[0240] If it exceeds the upper limit of mathematical expression 8, it is difficult to secure optical performance due to chromatic aberration at the telephoto end, and the amount of movement of each lens group increases significantly during zooming, making mechanical miniaturization difficult. If it is below the lower limit of mathematical expression 8, it is difficult to secure performance as a zoom optical system. A zoom optical system satisfying mathematical expression 8 can secure practically useful optical performance. Mathematical expression 8 can preferably satisfy 1.7 < f_tele / f_wide < 1.9 in the present embodiment.

[0241]

[0242] [Equation 9]

[0243] 0.1 < |f_LG2 / f_LG1| < 0.5

[0244] Mathematical expression 9 can establish the relationship between the focal length (f_LG1) of the first lens group (LG1) and the focal length (f_LG2) of the second lens group (LG2). Mathematical expression 9 is a condition for reducing aberration and improving optical performance.

[0245] The first lens group (LG1) and the second lens group (LG2) satisfying mathematical expression 9 can appropriately correct astigmatism and coma aberration. In addition, the zoom optical system has a zoom magnification of approximately 2 times and can reduce the overall length of the optical system. In the present embodiment, mathematical expression 9 can preferably satisfy 0.1 < |f_LG2 / f_LG1| < 0.3.

[0246]

[0247] [Equation 10]

[0248] 5 < f_LG1 / f_wide < 6

[0249] Mathematical expression 10 can establish a relationship between the focal length (f_G1) of the first lens group (LG1) and the overall focal length (f_wide) of the optical system (1000) in the first mode, the wide-angle end (wide). Mathematical expression 10 is a condition for limiting the magnitude of the refractive power of the first lens group (LG1).

[0250] If the upper limit of mathematical expression 10 is exceeded, the first lens group (LG1) has a weak refractive power, making it difficult to secure a back focal distance and thus unable to obtain a clear image. If the lower limit of mathematical expression 10 is less than the lower limit of mathematical expression 10, the first lens group (LG1) has a strong refractive power, making it difficult to correct field curvature aberration at the wide-angle position, spherical aberration at the telephoto position, and coma aberration. In the present embodiment, mathematical expression 10 can preferably satisfy 5 < f_LG1 / f_wide < 5.5.

[0251]

[0252] [Equation 11]

[0253] 1 < |f_LG2 / f_wide| < 2

[0254] In mathematical expression 11, the relationship between the focal length (f_LG2) of the second lens group (LG2) and the overall focal length (f_wide) of the optical system (1000) in the first mode, the wide-angle end (wide), can be established. Mathematical expression 11 is a condition for limiting the size of the refractive power of the second lens group (LG2).

[0255] If the upper limit of mathematical expression 11 is exceeded, the movement amount of the second lens group (LG2) for zoom operation may be large. If it is less than the lower limit of mathematical expression 11, the second lens group (LG2) may be difficult to manufacture. In the present embodiment, mathematical expression 11 preferably satisfies 1 < |f_LG2 / f_wide| < 1.5.

[0256]

[0257] [Equation 12]

[0258] 1.5 < f_LG3 / f_wide < 2

[0259] In mathematical expression 12, the relationship between the focal length (f_LG3) of the third lens group (LG3) and the overall focal length (f_wide) of the optical system (1000) in the first mode, the wide-angle end (wide), can be established. Mathematical expression 12 is a condition for limiting the size of the refractive power of the third lens group (LG3).

[0260] If the upper limit of mathematical expression 12 is exceeded, the stroke length of the third lens group (LG3) increases during focusing, making it difficult to miniaturize the zoom lens. If the lower limit of mathematical expression 12 is less than the lower limit, the refractive power of the third lens group (LG3) becomes too strong, and the variation of aberrations increases when performing field correction according to the object distance. In the present embodiment, mathematical expression 12 can preferably satisfy 1.6 < f_LG3 / f_wide < 1.8.

[0261]

[0262] [Equation 13]

[0263] 1.5 < f_LG4 / f_wide < 2

[0264] In mathematical expression 13, the relationship between the focal length (f_LG4) of the fourth lens group (LG4) and the overall focal length (f_wide) of the optical system (1000) in the first mode, the wide-angle end (wide), can be established. Mathematical expression 13 is a condition for limiting the size of the refractive power of the fourth lens group (LG4).

[0265] If the upper limit of mathematical expression 13 is exceeded, the stroke length of the fourth lens group (LG4) increases during focusing, making it difficult to miniaturize the zoom lens. If the lower limit of mathematical expression 13 is less than the lower limit, the refractive power of the fourth lens group (LG4) becomes too strong, and the variation of aberrations increases when performing image plane correction according to the object distance. In the present embodiment, mathematical expression 13 can preferably satisfy 1.5 < f_LG4 / f_wide < 1.7.

[0266]

[0267] [Equation 14]

[0268] 2.5 < f_LG1 / f_tele < 3

[0269] Mathematical expression 14 can establish the relationship between the focal length (f_G1) of the first lens group (LG1) and the overall focal length (f_tele) of the optical system (1000) in the third mode, the telephoto end (tele). Mathematical expression 14 is a condition for limiting the size of the refractive power of the first lens group (LG1).

[0270] If the upper limit of mathematical expression 14 is exceeded, the first lens group (LG1) has a weak refractive power, making it difficult to secure a back focal distance and thus obtaining a clear image. If the lower limit of mathematical expression 14 is less than the lower limit, the first lens group (LG1) has a strong refractive power, making it difficult to correct field curvature aberration at the wide-angle position, spherical aberration at the telephoto position, and coma aberration. In the present embodiment, mathematical expression 14 can preferably satisfy 2.6 < f_LG1 / f_tele < 2.8.

[0271]

[0272] [Equation 15]

[0273] 0.1 < |f_LG2 / f_tele| < 1

[0274] In mathematical expression 15, the relationship between the focal length (f_G2) of the second lens group (LG2) and the total focal length (f_tele) of the optical system (1000) in the third mode, the telephoto end (tele), can be established. Mathematical expression 15 is a condition for limiting the size of the refractive power of the second lens group (LG2).

[0275] If the upper limit of Equation 15 is exceeded, the movement amount of the second lens group (LG2) for zoom operation may be large. If it is less than the lower limit of Equation 15, the second lens group (LG2) may be difficult to manufacture. Equation 15 may preferably satisfy 0.4 < |f_LG2 / f_tele| < 0.6 in the present embodiment.

[0276]

[0277] [Equation 16]

[0278] 0.5 < f_LG3 / f_tele < 1

[0279] In mathematical expression 16, the relationship between the focal length (f_G3) of the third lens group (LG3) and the total focal length (f_tele) of the optical system (1000) in the third mode, the telephoto end (tele), can be established. Mathematical expression 16 is a condition for limiting the size of the refractive power of the third lens group (LG3).

[0280] If it exceeds the upper limit of mathematical expression 16, the stroke length of the third lens group (LG3) increases during focusing, making it difficult to miniaturize the zoom lens. If it is less than the lower limit of mathematical expression 16, the refractive power of the third lens group (LG3) becomes too strong, and the variation of aberration increases when performing image plane correction according to the object distance. In the present embodiment, mathematical expression 16 can preferably satisfy 0.8 < f_LG3 / f_tele < 1.

[0281]

[0282] [Equation 17]

[0283] 0.5 < f_LG4 / f_tele < 1

[0284] In mathematical expression 17, the relationship between the focal length (f_G4) of the fourth lens group (LG4) and the total focal length (f_tele) of the optical system (1000) in the third mode, the telephoto end (tele), can be established. Mathematical expression 17 is a condition for limiting the size of the refractive power of the fourth lens group (LG4).

[0285] If the upper limit of mathematical expression 17 is exceeded, the stroke length of the fourth lens group (LG4) increases during focusing, making it difficult to miniaturize the zoom lens. If the lower limit of mathematical expression 17 is less than the lower limit, the refractive power of the fourth lens group (LG4) becomes too strong, and the variation of aberrations increases when performing image plane correction according to the object distance. In the present embodiment, mathematical expression 17 can preferably satisfy 0.7 < f_LG4 / f_tele < 0.9.

[0286]

[0287] [Equation 18]

[0288] 4 < LG2_stroke < 5

[0289] Mathematical expression 18 can set the range of the stroke length (LG2_stroke) of the second lens group (LG2). If it exceeds the upper limit of Mathematical expression 18, the stroke length of the second lens group (LG2) increases during focusing, making it difficult to miniaturize the zoom lens. If it is less than the lower limit of Mathematical expression 18, the performance of the zoom optical system may deteriorate. Mathematical expression 18 can preferably satisfy 4.5 < LG2_stroke < 5 in the present embodiment.

[0290]

[0291] [Equation 19]

[0292] 3 < LG4_stroke < 4

[0293] Mathematical expression 19 can set the range of the stroke length (LG4_stroke) of the fourth lens group (LG4). If it exceeds the upper limit of Mathematical expression 19, the stroke length of the fourth lens group (LG4) increases during focusing, making it difficult to miniaturize the zoom lens. If it is less than the lower limit of Mathematical expression 19, the performance of the zoom optical system may deteriorate. Mathematical expression 19 can preferably satisfy 3.5 < LG4_stroke < 4 in the present embodiment.

[0294]

[0295] [Equation 20]

[0296]

[0297] 30 < TTL < 40

[0298] In mathematical expression 20, TTL (Total track length) means the distance (mm) from the center of the first surface (S1) of the first lens (101, 201, 301) to the upper surface of the image sensor (300) on the optical axis (OA). In this embodiment, mathematical expression 20 can preferably satisfy 33 < TTL < 36.

[0299]

[0300] [Equation 21]

[0301]

[0302] 4 < ImgH < 6

[0303] Mathematical expression 21 indicates that ImgH represents the maximum diagonal length of the image sensor (300). Mathematical expression 21 can set the diagonal size (ImgH) of the image sensor (300) and provide an optical system having a vehicle sensor size. In the present embodiment, Mathematical expression 21 preferably satisfies 4.5 < ImgH < 5.5.

[0304]

[0305] [Equation 22]

[0306] 1 < BFL < 2

[0307] In mathematical expression 22, BFL is the optical axis distance from the image sensor (300) to the center of the sensor side of the last lens. When mathematical expression 22 is satisfied, the installation space of the filter (400) and the cover glass (400) can be secured, the assembling of the components can be improved through the gap between the image sensor (300) and the last lens, and the joining reliability can be improved. In the present embodiment, mathematical expression 22 can preferably satisfy 1.5 < BFL < 2. When the BFL is less than the range of mathematical expression 22, some of the light traveling to the image sensor may not be transmitted to the image sensor, which may cause a decrease in resolution. When the BFL exceeds the range of mathematical expression 22, stray light may be introduced, which may deteriorate the aberration characteristics of the optical system.

[0308]

[0309] [Equation 23]

[0310] 10 < HFOV_wide < 20

[0311] In mathematical expression 23, the range of the angle of view (FOV_wide) in the first mode, the wide-angle end (wide), can be set. In mathematical expression 23, an angle of view suitable for a vehicle optical system can be provided. In the present embodiment, the FOV preferably satisfies 12 < HFOV_wide < 15.

[0312]

[0313] [Equation 24]

[0314] 5 < HFOV_tele < 10

[0315] In mathematical expression 24, the range of the horizontal field of view (FOV_tele) in the third mode, the telephoto end (tele), can be set. In mathematical expression 14, an angle of view suitable for a vehicle optical system can be provided. In the present embodiment, the FOV preferably satisfies 6 < HFOV_tele < 8.

[0316]

[0317] [Equation 25]

[0318] 3 < TTL / CA_max < 4

[0319] In mathematical expression 25, CA_max means the largest effective diameter (mm) among the object-side and sensor-side of a plurality of lenses, and TTL (Total track length) means the distance (mm) from the vertex of the first surface (S1) of the first lens (101) to the upper surface of the image sensor (300) on the optical axis (OA). Mathematical expression 25 sets the relationship between the total optical axis length of the optical system and the maximum effective diameter, thereby providing an improved vehicle optical system. In the present embodiment, mathematical expression 25 can preferably satisfy 3.3 < TTL / CA_max < 3.7.

[0320]

[0321] [Equation 26]

[0322] 6 < TTL / ImgH < 7

[0323] Mathematical expression 26 states that TTL (Total track length) means the distance (mm) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor (300) on the optical axis (OA), and ImgH means the maximum diagonal length of the image sensor (300). When Mathematical expression 26 is satisfied, the optical system (1000) can have TTL for application to the vehicle image sensor (300), thereby providing improved image quality. In the present embodiment, Mathematical expression 26 can preferably satisfy 6.5 < TTL / ImgH < 7.

[0324]

[0325] [Equation 27]

[0326] 1.5 < F_wide / ImgH < 2.5

[0327] Mathematical expression 27 is where F_wide is the total effective focal length of the optical system (1000) in the first mode, the wide-angle end, and ImgH represents the maximum diagonal length of the image sensor (300). Such an optical system (1000) may have improved aberration characteristics in the size of the vehicle image sensor (300). In the present embodiment, Mathematical expression 27 may preferably satisfy 1.8 < F_wide / ImgH < 2.2.

[0328]

[0329] [Equation 28]

[0330] 3 < F_tele / ImgH < 4

[0331] Mathematical expression 28 is such that F_tele is the total effective focal length of the optical system (1000) in the third mode, the telephoto end (tele), and ImgH represents the maximum diagonal length of the image sensor (300). Such an optical system (1000) may have improved aberration characteristics in the size of the vehicle image sensor (300). In the present embodiment, Mathematical expression 28 may preferably satisfy 3.5 < F_tele / ImgH < 4.

[0332]

[0333] [Equation 29]

[0334] 0.1 < ΣCT / TTL < 1

[0335] Mathematical expression 29 can set the relationship between the sum of the central thicknesses of the lenses (ΣCT) and the distance (TTL) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor (300) on the optical axis (OA). If the upper limit of Mathematical expression 29 is exceeded, the number of lenses increases and the movement of the moving lens group in the zoom optical system may become disadvantageous. If the lower limit of Mathematical expression 29 is lower, the magnification performance of the zoom lens optical system may deteriorate. In the present embodiment, Mathematical expression 29 can preferably satisfy 0.3 < ΣCT / TTL < 0.5.

[0336]

[0337] [Equation 30]

[0338] 0.1 < ΣCG / TTL < 0.5

[0339] Mathematical expression 30 can set the relationship between the sum of the spacings between adjacent lenses (ΣCG) and the distance (TTL) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor (300) on the optical axis (OA). If the upper limit of Mathematical expression 30 is exceeded, the moving distance of the moving lens group in the zoom lens optical system increases, which may increase the current consumption during the zooming operation. If the lower limit of Mathematical expression 30 is less than the lower limit of Mathematical expression 30, the magnification performance of the zoom lens optical system may deteriorate. In the present embodiment, Mathematical expression 30 can preferably satisfy 0.2 < ΣCG / TTL < 0.4.

[0340]

[0341] [Equation 31]

[0342] 1 < ΣCT / ΣCG < 2

[0343] Mathematical expression 31 can set the relationship between the sum of the central thicknesses of the lenses (ΣCT) and the sum of the spacings between adjacent lenses (ΣCT). If the upper limit of Mathematical expression 31 is exceeded, the number of lenses increases and the movement of the moving lens group in the zoom optical system may become disadvantageous. If the lower limit of Mathematical expression 31 is lower, the magnification performance of the zoom lens optical system may deteriorate. In the present embodiment, Mathematical expression 31 can preferably satisfy 1 < ΣCT / ΣCG < 1.5.

[0344]

[0345] [Equation 32]

[0346] 1.5 < CA_max / CA_min < 2.5

[0347] In mathematical expression 32, CA_max represents the maximum effective diameter among the object-side and sensor-side surfaces of the lenses, and CA_Min represents the minimum effective diameter among the object-side and sensor-side surfaces of the lenses. When mathematical expression 32 is satisfied, the optical system can set a size for a slim and compact structure while maintaining optical performance. In the present embodiment, mathematical expression 32 can preferably satisfy 1.8 < CA_max / CA_min < 2.2.

[0348]

[0349] [Equation 33]

[0350] 1 < CA_max / ImgH < 2

[0351] In mathematical expression 33, CA_max represents the maximum effective diameter among the object-side and sensor-side surfaces of the lenses, and Imgh represents the maximum diagonal length of the image sensor (300). When mathematical expression 33 is satisfied, the optical system can maintain good optical performance and set the size for a slim and compact structure. In the present embodiment, mathematical expression 33 can preferably satisfy 1.5 < CA_max / ImgH < 2.

[0352]

[0353] [Equation 34]

[0354] 0.5 < CA_min / ImgH < 1

[0355] In mathematical expression 34, CA_Min represents the minimum effective diameter among the object-side and sensor-side surfaces of the lenses, and Imgh represents the maximum diagonal length of the image sensor (300). When mathematical expression 34 is satisfied, the optical system can maintain good optical performance and set the size for a slim and compact structure. In the present embodiment, mathematical expression 34 can preferably satisfy 0.8 < CA_min / ImgH < 1.

[0356]

[0357] [Equation 35]

[0358]

[0359] In mathematical expression 35, Z can represent Sag, which is the distance from any position on the aspherical surface to the vertex of the aspherical surface along the optical axis. Y can represent the distance from any position on the aspherical surface to the optical axis in the direction perpendicular to the optical axis. c can represent the curvature of the lens, and K can represent the conic constant. In addition, A, B, C, D, E, and F can represent aspheric constants.

[0360]

[0361] The optical system (1000) according to the present embodiment can satisfy at least one or two or more mathematical equations from mathematical equations 1 to 35. In this case, the optical system (1000) can have improved optical characteristics. Specifically, when the optical system (1000) satisfies at least one or two or more mathematical equations from mathematical equations 1 to 35, the optical system (1000) can have improved resolution and improve aberration and distortion characteristics. In addition, the optical system (1000) can secure a back focal length (BFL) for applying the image sensor (300), can compensate for optical characteristic degradation due to temperature change, and can minimize the gap between the last lens and the image sensor (300), thereby having good optical performance at the center and periphery of the field of view (FOV).

[0362]

[0363] 수학식본 실시예12 < TD_LG1 / TD_LG2 < 32.1720.1 < TD_LG2 / TD_LG4 < 0.50.2233 < BFL_Min < 54.96430 < Ave_ABV < 4038.6651.5 < Ave_Ind < 1.81.5960.5 < |L5R1 / L5R2| < 10.84471 < CT6 / CT5 < 32.77881.5 < f_tele / f_wide < 21.86590.1 < |f_LG2 / f_LG1| < 0.50.204105 < f_LG1 / f_wide < 65.201111 < |f_LG2 / f_wide| < 21.059121.5 < f_LG3 / f_wide < 21.721131.5 < f_LG4 / f_wide < 21.621142.5 < f_LG1 / f_tele < 32.788150.1 < |f_LG2 / f_tele| < 10.568160.5 < f_LG3 / f_tele < 10.923170.5 < f_LG4 / f_tele < 10.869184 < LG2_stroke < 54.785193 < LG4_stroke < 43.8522030 < TTL < 4034.300214 < ImgH < 65.040221 < BFL < 21.7762310 < HFOV_wide < 2013.823245 < HFOV_tele < 107.294253 < TTL / CA_max < 43.573266 < TTL / ImgH < 76.806271.5 < F_wide / ImgH < 2.52.063283 < F_tele / ImgH < 43.849290.1 < ΣCT / TTL < 0.50.443300.1 < ΣCG / TTL < 0.50.353311 < ΣCT / ΣCG < 21.256321.5 < CA_max / CA_min < 2.52.087331 < CA_max / ImgH < 21.905340.5 < CA_min / ImgH < 10.913

[0364] Table 4 shows the result values ​​for the mathematical expressions 1 to 34 described above in the optical system (1000) of the embodiment. Referring to Table 4, it can be seen that the optical system (1000) satisfies at least one, two or more, or three or more of the mathematical expressions 1 to 34. In detail, it can be seen that the optical system (1000) according to the embodiment satisfies all of the mathematical expressions 1 to 34. Accordingly, the optical system (1000) can have good optical performance and excellent optical characteristics at the center and periphery of the field of view (FOV).

[0365]

[0366] Fig. 11 is an example of a plan view of a vehicle to which a camera module or optical system according to an embodiment of the invention is applied. Referring to Fig. 11, a vehicle camera system according to an embodiment of the invention includes an image generating unit (11), a first information generating unit (12), a second information generating unit (21, 22, 23, 24, 25, 26), and a control unit (14). The image generating unit (11) may include at least one camera module (31) disposed in the vehicle, and may capture images of the front of the vehicle and / or the driver to generate a front image or an interior image of the vehicle. The image generating unit (11) may capture images of the surroundings of the vehicle in one or more directions as well as the front of the vehicle using the camera module (31), to generate an image of the surroundings of the vehicle. Here, the front image and the surrounding images may be digital images, and may include color images, black and white images, infrared images, etc. In addition, the front image and the surrounding images may include still images and moving images. The image generation unit (11) provides the driver image, the front image, and the surrounding image to the control unit (14). Next, the first information generation unit (12) may include at least one radar and / or camera placed in the vehicle, and detects the front of the vehicle to generate first detection information. Specifically, the first information generation unit (12) is placed in the vehicle, and detects the position and speed of vehicles located in front of the vehicle, the presence and position of pedestrians, etc. to generate first detection information.

[0367] By using the first detection information generated by the first information generating unit (12), the distance between the own vehicle and the vehicle in front can be controlled to be maintained at a constant level, and the stability of vehicle operation can be improved in specific preset cases, such as when the driver wants to change the driving lane of the own vehicle or when backing up. The first information generating unit (12) provides the first detection information to the control unit (14). The second information generating unit (21, 22, 23, 24, 25, 26) detects each side of the own vehicle based on the front image generated by the image generating unit (11) and the first detection information generated by the first information generating unit (12), and generates second detection information. Specifically, the second information generating unit (21, 22, 23, 24, 25, 26) may include at least one radar and / or camera disposed in the own vehicle, and may detect the position and speed of vehicles located on the side of the own vehicle or capture images. Here, the second information generation units (21, 22, 23, 24, 25, 26) can be placed at the front two corners, side mirrors, and rear center and rear two corners of the vehicle, respectively.

[0368] At least one information generating unit of these vehicle camera systems may be equipped with an optical system and a camera module having the same as described in the embodiments disclosed above, and may provide or process information acquired through the front, rear, each side or corner area of ​​the vehicle to a user to enable autonomous driving or to protect the vehicle and objects from surrounding safety.

[0369] The optical system of the camera module according to an embodiment of the invention can be installed in multiple units within a vehicle to enhance safety regulations, autonomous driving functions, and convenience. Furthermore, the optical system of the camera module is used as a component for controlling systems such as the Lane Keeping Assistance System (LKAS), Lane Departure Warning System (LDWS), and Driver Monitoring System (DMS). These vehicle camera modules can achieve stable optical performance even under ambient temperature changes and offer competitive pricing, thereby ensuring the reliability of vehicle components.

[0370]

[0371] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be construed as falling within the scope of the present invention.

[0372] In addition, although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

Claims

1. Including first to fourth lens groups arranged along the optical axis, The above first lens group has positive (+) refractive power, The above second lens group has a negative (-) refractive power, The above third lens group has positive (+) refractive power, The above fourth lens group has positive (+) refractive power, In the first lens group, the prism lens is placed closest to the object side, The above prism lens includes an incident surface, a reflecting surface, and an exit surface, An optical system in which the incident surface or the exit surface of the prism lens has a convex shape.

2. In paragraph 1, The above first lens group and the above third lens group are fixed groups, An optical system wherein the second lens group and the fourth lens group are moving groups.

3. In paragraph 1, The lens included in the third lens group is an optical system having a convex shape on both sides.

4. In paragraph 1, In the wide-angle section, the distance between the first lens group and the second lens group on the optical axis is smaller than the distance between the second lens group and the third lens group, An optical system in which the distance between the first lens group and the second lens group on the optical axis in the telephoto end is greater than the distance between the second lens group and the third lens group.

5. In paragraph 1, An optical system in which the lens placed closest to the object side in the second lens group has a concave shape on both sides.

6. In paragraph 1, The first lens group includes a first lens having positive (+) refractive power, The second lens group includes a second lens having negative (-) refractive power, a third lens having negative (-) refractive power, and a fourth lens having positive (+) refractive power. The third lens group includes a fifth lens having positive (+) refractive power, An optical system in which the fourth lens group includes a sixth lens having positive (+) refractive power, a seventh lens having negative (-) refractive power, and an eighth lens having positive (+) refractive power.

7. In paragraph 6, An optical system in which an aperture is positioned between the fourth lens and the fifth lens or between the fifth lens and the sixth lens.

8. In paragraph 6, An optical system in which the effective diameter of the fifth lens among the first to eighth lenses is the largest.

9. In paragraph 1, An optical system that satisfies the following conditions. <Conditional expression> 1.5 < f_tele / f_wide < 2 (In the above conditional expression, f_tele is the total focal length of the optical system at the telephoto end, and f_wide is the total focal length of the optical system at the wide-angle end.) 10. In paragraph 1, An optical system that satisfies the following conditions. <Conditional expression> 0.1 < ΣCT / TTL < 1 (In the above conditional expression, ΣCT is the sum of the central thicknesses of the lenses, and TTL is the optical axis distance from the vertex of the object-side surface of the lens placed closest to the object side to the upper surface of the image sensor.)

Images