KR102443674B1 - Optical system and camera module including the same - Google Patents

Abstract

The optical system according to the embodiment includes first to third lenses disposed along an optical axis from an object side to a sensor side direction, wherein the first lens has a meniscus shape convex toward the object side, and satisfies 1.7 ≤ nt_1 ≤ 2.3 and TTL ≤ 6mm. (nt_1 is the refractive index of the first lens for light in the t-line wavelength band, and TTL is the distance on the optical axis from the object side surface of the first lens to the image sensor image surface).

Description

Optical system and camera module including the same

The embodiment relates to an optical system having improved optical performance and a camera module including the same.

ADAS (Advanced Driving Assistance System) is a state-of-the-art driver assistance system to assist drivers in driving. is composed of For example, the ADAS sensor device detects a vehicle ahead and recognizes a lane. Then, when the target lane or target speed and the target in front are determined, the vehicle's ESC (Electrical Stability Control), EMS (Engine Management System), MDPS (Motor Driven Power Steering), etc. are controlled. Typically, ADAS may be implemented as an automatic parking system, a low-speed city driving assistance system, a blind spot warning system, and the like.

Sensor devices for detecting the situation ahead in ADAS include a GPS sensor, a laser scanner, a front radar, and a lidar.

Such a camera may be disposed outside or inside the vehicle to sense surrounding conditions of the vehicle. In addition, the camera may be disposed inside the vehicle to detect the situation of the driver and the passenger. For example, the camera may photograph the driver at a position adjacent to the driver, and may detect the driver's health state, drowsiness, alcohol consumption, and the like. In addition, the camera may photograph the passenger at a position adjacent to the passenger, detect whether the passenger is sleeping, health status, etc., and may provide information about the passenger to the driver.

In particular, the most important factor for obtaining an image in a camera is an imaging lens that forms an image. Recently, interest in high performance such as high image quality and high resolution is increasing, and research on an optical system including a plurality of lenses is being conducted in order to realize this. However, when the camera is exposed to a harsh environment, for example, high temperature, low temperature, moisture, high humidity, etc. outside or inside the vehicle, there is a problem in that the characteristics of the optical system change. In this case, the camera has a problem in that it is difficult to uniformly derive excellent optical characteristics and aberration characteristics.

Accordingly, a new optical system and a camera capable of solving the above problems are required.

An embodiment is to provide an optical system and a camera module with improved optical characteristics.

In addition, the embodiment intends to provide an optical system and a camera module capable of providing excellent optical properties in a low-temperature or high-temperature environment.

In addition, embodiments are intended to provide an optical system and a camera module capable of preventing or minimizing changes in optical properties in various temperature ranges.

The optical system according to the embodiment includes first to third lenses disposed along an optical axis from an object side to a sensor side direction, wherein the first lens has a meniscus shape convex toward the object side, and satisfies 1.7 ≤ nt_1 ≤ 2.3 and TTL ≤ 6mm.

(nt_1 is the refractive index of the first lens for light in the t-line wavelength band, and TTL is the distance on the optical axis from the object side surface of the first lens to the image sensor image surface).

In addition, the object-side surface and the sensor-side surface of the first lens may be spherical.

In addition, 1.4mm ≤ D_1 may be satisfied.

(D_1 is the thickness on the optical axis of the first lens.)

In addition, a difference between the Abbe numbers of the first to third lenses may be 10 or less.

In addition, the F-number of the optical system may be 1.8 to 2.2.

Further, nt_2 < nt_1, nt_3 < nt_1 are satisfied, materials of the first lens and the second lens are different from each other, materials of the first lens and the third lens are different from each other, and the second lens and the second lens are different from each other. 3 The material of the lens may be the same as each other.

(nt_1 is the refractive index of the first lens with respect to the light of the t-line wavelength band, nt_2 is the refractive index of the second lens with respect to the light of the t-line wavelength band, and nt_3 is the refractive index of the light of the t-line wavelength band It is the refractive index of the third lens.)

In addition, the optical system according to the embodiment includes first to third lenses disposed along an optical axis in a direction from the object side to the sensor side, the first lens has a positive refractive power, and the first lens has a convex lens toward the object side. Each of the first to third lenses may have a niscus shape, and may satisfy the following equation.

dnt_1/dt > 0

dnt_2/dt < 0

dnt_3/dt < 0

(dnt_1/dt is a change in refractive index of the first lens according to temperature change, dnt_2/dt is a change in refractive index of the second lens according to temperature change, and dnt_3/dt is a change in refractive index of the third lens according to temperature change .)

In addition, the object-side surface and the sensor-side surface of the first lens may be spherical.

Also, 1.7 ≤ nt_1 ≤ 2.3 may be satisfied.

(nt_1 is the refractive index of the first lens with respect to the light of the t-line wavelength band.)

Further, nt_2 < nt_1, nt_3 < nt_1 are satisfied, materials of the first lens and the second lens are different from each other, materials of the first lens and the third lens are different from each other, and the second lens and the second lens are different from each other. 3 The material of the lens may be the same as each other.

(nt_1 is the refractive index of the first lens with respect to the light of the t-line wavelength band, nt_2 is the refractive index of the second lens with respect to the light of the t-line wavelength band, and nt_3 is the refractive index of the light of the t-line wavelength band It is the refractive index of the third lens.)

In addition, TTL ≤ 6mm may be satisfied.

(TTL is the distance in the optical axis from the object side surface of the first lens to the image sensor image surface.)

The optical system and the camera module according to the embodiment may have improved optical properties. In detail, in the optical system according to the embodiment, the plurality of lenses may have a set shape, refractive power, focal length, thickness, etc., and thus may have improved distortion characteristics and aberration characteristics. Accordingly, the optical system and the camera module according to the embodiment may provide high-resolution and high-quality images within a set angle of view range.

In addition, the optical system and the camera module according to the embodiment may operate in various temperature ranges. In detail, the optical system may include a first lens made of a glass material, and second and third lenses made of a plastic material. In this case, each of the first to third lenses may have a set refractive power. Accordingly, even when the focal length of each lens is changed due to a change in refractive index according to a change in temperature, the first to third lenses may be mutually compensated. That is, the optical system can effectively distribute the refractive power in the temperature range of low (about -40°C) to high (about 99°C), and in the temperature range of low (-40°C) to high (99°C) Changes in optical properties can be prevented or minimized. Accordingly, the optical system and the camera module according to the embodiment may maintain improved optical properties in various temperature ranges.

In addition, the optical system and the camera module according to the embodiment satisfy the minimum angle of view set by the lens and realize excellent optical characteristics. Due to this, the optical system may be provided in a slimmer and more compact structure. Accordingly, the optical system and the camera module may be provided for various applications and devices, and may have excellent optical properties even in a harsh temperature environment, for example, in a high temperature vehicle interior in summer.

1 is a diagram illustrating a plan view of a vehicle to which a camera module or an optical system according to an embodiment is applied.
2 and 3 are views illustrating the interior of a vehicle to which a camera module or an optical system according to an embodiment is applied.
4 is a graph of a change in refractive index according to a temperature change of a first lens in an optical system according to an embodiment.
5 is a graph showing a change in refractive index according to a temperature change of a second lens and a third lens in the optical system according to the embodiment.
6 is a block diagram of an optical system according to the first embodiment.
7 is a graph of relative illumination for each field of the optical system according to the first embodiment.
8 is data on distortion characteristics of the optical system according to the first embodiment.
9 to 17 are graphs of diffraction MTF and aberration diagrams for each temperature of the optical system according to the first embodiment.
18 is a block diagram of an optical system according to the second embodiment.
19 is a graph of relative illumination for each field of the optical system according to the second embodiment.
20 is data on the distortion characteristics of the optical system according to the second embodiment.
21 to 29 are graphs of diffraction MTF and aberration diagrams for each temperature of the optical system according to the second embodiment.
30 is a configuration diagram for explaining some terms in an optical system according to an embodiment.

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

However, the technical spirit of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected between embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or one or more) of A and (and) B, C", it is combined with A, B, C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and are not limited to the essence, order, or order of the component by the term. And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include a case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on "above (above) or under (below)" of each component, the top (above) or bottom (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upper direction but also a lower direction based on one component may be included.

In addition, the convex surface of the lens may mean that the lens surface of the optical axis region has a convex shape, and the concave lens surface may mean that the lens surface of the optical axis region has a concave shape.

In addition, "object side" may mean a surface of the lens facing the object side with respect to the optical axis, and "sensor side" may mean a surface of the lens facing the image sensor with respect to the optical axis.

In addition, the vertical direction may mean a direction perpendicular to the optical axis, and the end of the lens or lens surface may mean the end of the effective area of the lens through which the incident light passes.

In addition, the central thickness of the lens may mean a length in the optical axis direction between the object side and the sensor side in the optical axis of the lens.

In addition, the size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on a measurement method or the like.

In addition, in an embodiment, low temperature may mean a specific temperature (-40 ℃) or may mean a temperature range of about -40 ℃ to about 30 ℃, room temperature means a specific temperature (22 ℃) or about 20 ℃ to about It may mean a temperature range of 30 °C. Also, high temperature may mean a specific temperature (99°C) or a temperature range of about 85°C to about 105°C.

1 is a diagram illustrating a plan view of a vehicle to which a camera module or an optical system according to an embodiment is applied, and FIGS. 2 and 3 are views illustrating the interior of a vehicle to which a camera module or an optical system according to an embodiment is applied.

First, referring to FIG. 1 , the vehicle camera system according to the embodiment includes an image generation unit 2110 , a first information generation unit 2120 , and a second information generation unit 2210 , 2220 , 2230 , 2240 , 2250 , 2260 ). and a control unit 2140 .

The image generator 2110 may include at least one first camera module 2310 disposed outside or inside the vehicle 2000 , and may generate a front image of the vehicle 2000 . In addition, the image generating unit 2110 uses the first camera module 2310 to photograph the surroundings of the vehicle 2000 in one or more directions as well as the front of the vehicle 2000 to obtain an image of the surroundings of the vehicle 2000 . can create Here, the front image and the surrounding image may be a digital image, and may include a color image, a black-and-white image, and an infrared image. Also, the front image and the surrounding image may include a still image and a moving image. The image generator 2110 may provide the front image and the surrounding image to the controller 2140 .

Next, the first information generating unit 2120 may include at least one radar and/or a camera disposed on the vehicle 2000 , and detects the front of the vehicle 2000 to generate first detection information. Specifically, the first information generating unit 2120 is disposed in the vehicle 2000 and detects the position and speed of the vehicles 2000 located in front of the vehicle 2000, the presence and location of pedestrians, and the like to obtain the first detection information. can create

By using the first detection information generated by the first information generating unit 2120 , it is possible to control the distance between the vehicle 2000 and the vehicle in front to be kept constant, and the driver wants to change the driving lane of the vehicle 2000 . The driving stability of the vehicle 2000 may be increased in a preset specific case, such as a case or a reverse parking case. The first information generator 2120 may provide the first detection information to the controller 2140 .

Next, the second information generators 2210 , 2220 , 2230 , 2240 , 2250 , and 2260 based on the front image generated by the image generator 2110 and the first detection information generated by the first information generator 2120 . Thus, each side of the vehicle 2000 is sensed to generate second sensing information. Specifically, the second information generators 2210 , 2220 , 2230 , 2240 , 2250 , and 2260 may include at least one radar and/or camera disposed on the vehicle 2000 , and are located on the side of the vehicle 2000 . It is possible to detect the position and speed of the located vehicles or take an image. Here, the second information generators 2210 , 2220 , 2230 , 2240 , 2250 , and 2260 may be disposed at both front corners, side mirrors, and rear center and rear corners of the vehicle 2000 , respectively.

Also, referring to FIGS. 2 and 3 , the image generator 2110 may include at least one second camera module 2320 disposed inside the vehicle 2000 . The second camera module 2320 may be disposed adjacent to a driver and a passenger. For example, the second camera module 2320 may be disposed at a location spaced apart from a driver and a passenger by a first distance d1 to generate an internal image of the vehicle 2000 . In this case, the first distance d1 may be about 500 mm or more. In detail, the first distance d1 may be about 600 mm or more. In addition, the second camera module 2320 may have an angle of view (FOV) of about 55 degrees or more.

The image generator 2110 may generate an internal image of the vehicle 2000 by photographing a driver and/or a passenger inside the vehicle 2000 using the second camera module 2320 . Here, the image inside the vehicle may be a digital image, and may include a color image, a black-and-white image, and an infrared image. Also, the internal image may include a still image and a moving image. The image generating unit 2110 provides the internal image of the vehicle 2000 to the controller 2140 .

The controller 2140 may provide information to the occupant of the vehicle 2000 based on the information provided from the image generator 2110 . For example, based on the information provided from the image generating unit 2110, the driver's health state, drowsiness, drinking, etc. may be detected, and information such as guidance and warning corresponding thereto may be provided to the driver. have. In addition, based on the information provided from the image generating unit 2110, whether the passenger is sleeping, the health status, etc. may be detected, and information may be provided to the driver and/or the passenger.

Such a vehicle camera system may include a camera module having an optical system 1000 according to the following embodiment, and is provided to a user using information obtained through the front, rear, each side or corner area of the vehicle 2000 or to protect the vehicle 2000 and objects from autonomous driving or surrounding safety. In addition, it may be disposed inside the vehicle 2000 to provide various information to the driver and passengers. That is, at least one of the first camera module 2310 and the second camera module 2320 may include an optical system 1000 to be described later.

In the camera module according to the embodiment, a plurality of optical systems may be mounted in a vehicle for safety regulation, reinforcement of autonomous driving functions, and increased convenience. In addition, the optical system of the camera module is a part for control such as a lane keeping assistance system (LKAS), a lane departure warning system (LDWS), and a driver monitoring system (DMS), and is applied in a vehicle. Such a vehicle camera module can implement stable optical performance even when ambient temperature changes and provide a module with competitive price, thereby ensuring the reliability of vehicle parts.

Hereinafter, an optical system according to an embodiment will be described in detail.

The optical system 1000 according to the embodiment may include a plurality of lenses 100 and an image sensor 300 . In detail, the optical system 1000 according to the embodiment may include two or more lenses. For example, the optical system 1000 may include three lenses, and the first lens 110 , the second lens 120 , and the third lens 130 are sequentially arranged from the object side to the sensor side. and an image sensor 300 . The first to third lenses 110 , 120 , and 130 may be sequentially disposed along the optical axis OA of the optical system 1000 .

In this case, the light corresponding to the object information may pass through the first lens 110 , the second lens 120 , and the third lens 130 to be incident on the image sensor 300 .

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 third lenses 110 , 120 , and 130 passes. That is, the effective region may be a region in which incident light is refracted to realize optical properties.

The ineffective area may be disposed around the effective area. The ineffective area may be an area to which the light is not incident. That is, the ineffective region may be a region independent of the optical characteristic. Also, the ineffective region may be a region fixed to a barrel (not shown) for accommodating the lens.

The image sensor 300 may sense light. In detail, the image sensor 300 may detect light that has sequentially passed through the plurality of lenses 100 , in detail, the first to third lenses 110 , 120 , and 130 . The image sensor 300 may include a device capable of detecting incident light, such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

The image sensor 300 may include a plurality of pixels having a set size. For example, the pixel size of the image sensor 300 may be about 3 μm.

The image sensor 300 may detect light of a set wavelength. For example, the image sensor 300 may detect infrared (IR, Infrared Ray) light. In detail, the image sensor 300 may detect near infrared ray light of about 1500 nm or less. For example, the image sensor may detect light in a wavelength band of about 880 nm to about 1000 nm.

The optical system 1000 according to the embodiment may further include a cover glass 400 and a filter 500 .

The cover glass 400 may be disposed between the plurality of lenses 100 and the image sensor 300 . The cover glass 400 may be disposed adjacent to the image sensor 300 . The cover glass 400 may have a shape corresponding to the image sensor 300 . The cover glass 400 may be provided to have a size greater than or equal to that of the image sensor 300 to protect an upper portion of the image sensor 300 .

Also, the filter 500 may be disposed between the plurality of lenses 100 and the image sensor 300 . The filter 500 may be disposed between the image sensor 300 and the last lens (the third lens 130 ) closest to the image sensor 300 among the plurality of lenses 100 . In detail, the filter 500 may be disposed between the last lens (the third lens 130 ) and the cover glass 400 .

The filter 500 may pass light of a set wavelength band and filter light of a different wavelength band. The filter 500 may pass light of a wavelength band corresponding to the light received by the image sensor 300 and may block light of a wavelength band that does not correspond to the received light. In detail, the filter 500 may pass light in an infrared wavelength band and block light in an ultraviolet or visible ray band. For example, the filter 500 may include at least one of an infrared pass filter and an infrared cut-off filter.

Also, the optical system 1000 according to the embodiment may include an aperture (not shown). The aperture may control the amount of light incident on the optical system 1000 .

The aperture may be disposed at a set position. For example, the diaphragm may be positioned in front of the first lens 110 or disposed between two lenses selected from among the first to third lenses 110 , 120 , and 130 . For example, the diaphragm may be located at the rear of the first lens 110 .

In addition, at least one of the first to third lenses 110 , 120 , and 130 may serve as an aperture. In detail, the object-side or sensor-side surface of one of the first to third lenses 110 , 120 , and 130 may serve as an diaphragm for controlling the amount of light. For example, the sensor-side surface (the second surface S2 ) of the first lens 110 may serve as an aperture.

Hereinafter, the plurality of lenses 100 according to the embodiment will be described in more detail.

The first lens 110 may have a positive (+) refractive power in the optical axis OA. The first lens 110 may include a glass material.

The first lens 110 may include a first surface S1 defined as an object side surface and a second surface S2 defined as a sensor side surface. The first surface S1 may have a convex shape in the optical axis OA, and the second surface S2 may be concave in the optical axis OA. That is, the first lens 110 may have a meniscus shape convex from the optical axis OA toward the object.

At least one of the first surface S1 and the second surface S2 may be a sphere. For example, both the first surface S1 and the second surface S2 may be spheres.

The second lens 120 may have positive (+) or negative (-) refractive power in the optical axis OA. The second lens 120 may be made of a material different from that of the first lens 110 . For example, the second lens 120 may be made of a plastic material.

The second lens 120 may include a third surface S3 defined as an object side surface and a fourth surface S4 defined as a sensor side surface. The third surface S3 may have a convex shape in the optical axis OA, and the fourth surface S4 may be concave in the optical axis OA. That is, the second lens 120 may have a meniscus shape convex from the optical axis OA toward the object. Alternatively, the third surface S3 may have a convex shape along the optical axis OA, and the fourth surface S4 may be convex. That is, the second lens 120 may have a shape in which both sides are convex in the optical axis OA. Alternatively, the third surface S3 may have a concave shape in the optical axis OA, and the fourth surface S4 may be convex in the optical axis OA. That is, the second lens 120 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the third surface S3 may have a concave shape in the optical axis OA, and the fourth surface S4 may be concave in the optical axis OA. That is, the second lens 120 may have a concave shape on both sides of the optical axis OA.

At least one of the third surface S3 and the fourth surface S4 may be an aspherical surface. For example, both the third surface S3 and the fourth surface S4 may be an aspherical surface.

The third lens 130 may have positive (+) or negative (-) refractive power in the optical axis OA. The third lens 130 may be made of a material different from that of the first lens 110 . Also, the third lens 130 may be made of the same material as the second lens 120 . For example, the third lens 130 may be made of a plastic material.

The third lens 130 may include a fifth surface S5 defined as an object side surface and a sixth surface S6 defined as a sensor side surface. The fifth surface S5 may have a convex shape in the optical axis OA, and the sixth surface S6 may be concave in the optical axis OA. That is, the third lens 130 may have a meniscus shape convex from the optical axis OA toward the object. Alternatively, the fifth surface S5 may have a convex shape in the optical axis OA, and the sixth surface S6 may be convex in the optical axis OA. That is, the third lens 130 may have a shape in which both sides are convex in the optical axis OA. Alternatively, the fifth surface S5 may have a concave shape in the optical axis OA, and the sixth surface S6 may be convex in the optical axis OA. That is, the third lens 130 may have a meniscus shape convex from the optical axis OA toward the sensor. Alternatively, the fifth surface S5 may have a concave shape in the optical axis OA, and the sixth surface S6 may be concave in the optical axis OA. That is, the third lens 130 may have a concave shape on both sides of the optical axis OA.

At least one of the fifth surface S5 and the sixth surface S6 may be an aspherical surface. For example, both the fifth surface S5 and the sixth surface S6 may be an aspherical surface.

The optical system 1000 according to the embodiment may satisfy at least one of the following equations. Accordingly, the optical system 1000 according to the embodiment may prevent or minimize changes in optical properties depending on the temperature in a temperature range of low to high temperature, and thus may implement improved optical properties at various temperatures. In addition, the optical system 1000 according to the embodiment may have improved distortion and aberration characteristics at various temperatures by satisfying at least one of Equations to be described later.

Hereinafter, the equations will be described. In addition, terms indicated in some equations will be described with reference to FIG. 30 .

[Equation 1]

1.7 ≤ nt_1 ≤ 2.3

In Equation 1, nt_1 is a refractive index of the first lens 110 with respect to light in a t-line (1013.98 nm) or d-line (587.6 nm) wavelength band.

[Equation 2]

nt_2 < nt_1

nt_3 < nt_1

In Equation 2, nt_1 is the refractive index of the light of the t-line or d-line wavelength band of the first lens 110 , and nt_2 is the t-line or d-line wavelength band of the second lens 120 . It is a refractive index with respect to light, and nt_3 is a refractive index with respect to light of a t-line or d-line wavelength band of the third lens 130 .

[Equation 3]

dnt_1/dt ≥ 0

dnt_2/dt < 0

dnt_3/dt < 0

|dnt_2/dt| / |dnt_1/dt| > 20

In Equation 3, dt denotes a temperature change amount (°C), and dnt_1 is a change in the refractive index of the first lens 110 in the entire wavelength band, particularly in the d-line wavelength band. That is, dnt_1/dt means a change in the refractive index of the first lens 110 according to a temperature change in the entire wavelength band, particularly in the d-line wavelength band. In addition, dnt_2 is a change in the refractive index of the second lens 120 in the entire wavelength band, particularly in the d-line wavelength band, and dnt_2/dt is the second lens according to the temperature change in the entire wavelength band, particularly in the d-line wavelength band. (120) means a change in the refractive index. In addition, dnt_3 is a change in the refractive index of the third lens 130 in the entire wavelength band, particularly in the d-line wavelength band, and dnt_3/dt is the third lens according to the temperature change in the entire wavelength band, particularly in the d-line wavelength band. (130) means a change in the refractive index. In Equation 3, dt may be a temperature change from -40°C to 99°C.

When the optical system 1000 according to the embodiment satisfies at least one of Equations 1 to 3, the optical system 1000 may have good optical performance in a temperature range of a low temperature to a high temperature.

[Equation 4]

1 ≤ |v1 - v2| ≤ 10

1 ≤ |v1 - v3| ≤ 10

50 ≤ v1 + v2 + v3 ≤ 200

In Equation 4, v1 is the Abbe's number of the first lens 110 , v2 is the Abbe's number of the second lens 120 , and v3 is the Abbe's number of the third lens 130 .

When the optical system 1000 according to the embodiment satisfies Equation 4, the optical system 1000 may have improved chromatic aberration characteristics.

In detail, Equation 10 may satisfy 50 ≤ v1 + v2 + v3 ≤ 150 for improved incident light control characteristics and aberration control characteristics in a specific wavelength band.

More specifically, Equation 10 may satisfy 50 ≤ v1 + v2 + v3 ≤ 70 for improved incident light control characteristics and aberration control characteristics in a specific wavelength band.

[Equation 5]

0mm ≤ TTL ≤ 8mm

In Equation 5, TTL is the optical axis OA from the object-side surface (first surface S1) of the first lens 110 to the upper surface of the image sensor 300 in an environment of room temperature (about 22° C.) is the distance (mm) from In detail, Equation 5 may be 0mm ≤ TTL ≤ 7mm. Preferably, Equation 5 may be 0mm ≤ TTL ≤ 6mm.

[Equation 6]

Diop_L1 > Diop_L2 > Diop_L3

In Equation 6, Diop_L1 is a diopter value of the first lens 110 at room temperature (about 22° C.), and Diop_L2 is a diopter value of the second lens 120 at room temperature (about 22° C.) , and Diop_L3 is a diopter value of the third lens 130 at room temperature (about 22° C.).

[Equation 7]

1 < Diop_L1 / Diop_L2 < 2

In Equation 7, Diop_L1 is a diopter value of the first lens 110 at room temperature (about 22° C.), and Diop_L2 is a diopter value of the second lens 120 at room temperature (about 22° C.) to be.

[Equation 8]

10 < Diop_L1 / Diop_L3 < 600

In Equation 8, Diop_L1 is a diopter value of the first lens 110 at room temperature (about 22° C.), and Diop_L3 is a diopter value of the third lens 130 at room temperature (about 22° C.) to be.

When the optical system 1000 according to the embodiment satisfies at least one of Equations 6 to 8, the plurality of lenses 100 of the optical system 1000 may be disposed in the center and periphery of the field of view FOV, and at a low temperature to It can have good optical performance in a high temperature range.

[Equation 9]

1.8 ≤ F# ≤ 2.2

In Equation 9, F# is the F-number (F-number) of the optical system 1000 in environments of room temperature (about 22° C.), low temperature (about -40° C.) and high temperature (about 99° C.).

[Equation 10]

1mm ≤ D_1 ≤ 1.7mm

In Equation 10, D_1 is the central thickness (refer to FIG. 30 ) of the first lens 110 at room temperature (about 22° C.) and is the thickness (mm) of the first lens 110 on the optical axis OA. In detail, in Equation 10, 1.2 mm ≤ D_1 ≤ 1.6 mm. Preferably, Equation 10 may be 1.4 mm ≤ D_1 ≤ 1.5 mm.

When the optical system 1000 according to the embodiment satisfies Equation 10, the optical system 1000 may have improved optical performance and may be easily manufactured. For example, when the center thickness of the first lens 110 is less than about 1 mm, the focal length of the first lens 110 becomes long, and manufacturing a glass lens may be difficult. In addition, when the central thickness of the first lens 110 exceeds about 1.7 mm, the focal length of the first lens 110 may decrease, thereby degrading the overall optical performance of the optical system 1000 .

[Equation 10-1]

0.2 ≤ D_1/TTL ≤ 0.3

In Equation 10-1, D_1 is D_1 is the central thickness (refer to FIG. 30) of the first lens 110 at room temperature (about 22° C.), and the thickness (mm) at the optical axis OA of the first lens 110 )to be. In addition, TTL is the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the upper surface of the image sensor 300 in an environment of room temperature (about 22° C.) distance (mm).

When the optical system 1000 according to the embodiment satisfies Equation 10-1 at room temperature (about 22° C.), the optical system 1000 performs the optical system according to temperature change at room temperature (about 22° C.) and high temperature (about 99° C.). Performance changes can be prevented or minimized. In detail, Equation 10-1 may satisfy 0.25 ≤ D_1/TTL ≤ 0.3 for more improved optical performance in various temperature ranges.

[Equation 11]

1 < D_1 / D_2 < 1.6

In Equation 11, D_1 is the central thickness of the first lens 110 at room temperature (about 22° C.) and is the thickness (mm) on the optical axis OA of the first lens 110 . In addition, D_2 is the central thickness of the second lens 120 at room temperature (about 22° C.) and is the thickness (mm) on the optical axis OA of the second lens 120 . (See Fig. 30)

When the optical system 1000 according to the embodiment satisfies Equation 11, the optical system 1000 may improve aberration characteristics.

[Equation 12]

2 < D_1 / D_3 < 2.8

In Equation 12, D_1 is the central thickness of the first lens 110 at room temperature (about 22° C.), and is the thickness (mm) on the optical axis OA of the first lens 110 . In addition, D_3 is the central thickness of the third lens 130 at room temperature (about 22° C.) and is the thickness (mm) on the optical axis OA of the third lens 130 . (See Fig. 30)

When the optical system 1000 according to the embodiment satisfies Equation 12, the optical system 1000 may improve aberration characteristics.

[Equation 13]

f1 < f2 < f3

In Equation 13, f1 is the focal length (mm) of the first lens 110 at room temperature (about 22° C.), and f2 is the focal length (mm) of the second lens 120 at room temperature (about 22° C.) and f3 is the focal length (mm) of the third lens 130 at room temperature (about 22° C.).

In this case, the focal length f1 of the first lens 110 at room temperature (about 22° C.) may be greater than 4 mm and less than 7 mm. Also, the focal length f2 of the second lens 120 at room temperature (about 22° C.) may be greater than 7 mm and less than 13 mm. Also, the focal length f3 of the third lens 130 at room temperature (about 22° C.) may be greater than 80 mm and less than 120 mm.

When the optical system 1000 according to the embodiment satisfies Equation 13, the plurality of lenses 100 of the optical system 1000 may have good optical performance at the center and the periphery of the field of view (FOV).

[Equation 14]

0.4 < f1/f2 < 0.8

In Equation 14, f1 is the focal length (mm) of the first lens 110 at room temperature (about 22° C.), and f2 is the focal length (mm) of the second lens 120 at room temperature (about 22° C.) to be.

When the optical system 1000 according to the embodiment satisfies Equation 14, in the optical system 1000, the first lens 110 and the second lens 120 may have appropriate refractive power for controlling an incident light path. and the optical system 1000 may have improved resolution.

[Equation 15]

10 < f3 / f1 < 550

In Equation 15, f1 is the focal length (mm) of the first lens 110 at room temperature (about 22° C.), and f3 is the focal length (mm) of the third lens 130 at room temperature (about 22° C.) to be.

When the optical system 1000 according to the embodiment satisfies Equation 15, the optical system 1000 may have improved resolution by appropriately controlling the refractive power of the first lens 110 and the third lens 130 . .

[Equation 16]

0.5 < L1R1 / L1R2 < 0.8

In Equation 16, L1R1 is the radius of curvature of the object-side surface (first surface S1) of the first lens 110 at room temperature (about 22° C.), and L1R2 is the first lens at room temperature (about 22° C.) (110) is the radius of curvature of the sensor side face (second face S2).

When the optical system 1000 according to the embodiment satisfies Equation 16, the optical system 1000 may control incident light and may have improved aberration control characteristics.

[Equation 17]

2 < L2R1 / L2R2 < 2.3

In Equation 17, L2R1 is the radius of curvature of the object-side surface (third surface S3) of the second lens 120 at room temperature (about 22° C.), and L2R2 is the second lens at room temperature (about 22° C.) (120) is the radius of curvature of the sensor side surface (the fourth surface S4).

When the optical system 1000 according to the embodiment satisfies Equation 17, the optical system 1000 may have improved aberration control characteristics.

[Equation 18]

1 < L3R1 / L3R2 < 1.3

In Equation 18, L3R1 is the radius of curvature of the object-side surface (the fifth surface S5) of the third lens 130 at room temperature (about 22° C.), and L3R2 is the third lens at room temperature (about 22° C.) The radius of curvature of the sensor side surface (the sixth surface S6) of 130.

When the optical system 1000 according to the embodiment satisfies Equation 18, the optical system 1000 may have good optical performance in the periphery of the field of view (FOV).

[Equation 19]

0.5 < CA_L1S1 / CA_L3S2 < 0.8

In Equation 19, CA_L1S1 is the size of the effective diameter (CA, Clear Aperture) of the object-side surface (first surface S1) of the first lens 110 at room temperature (about 22° C.), and CA_L3S2 is room temperature (about 22° C.) ℃) of the sensor-side surface (sixth surface S6) of the third lens 130 is the size of the effective diameter.

When the optical system 1000 according to the embodiment satisfies Equation 19, the optical system 1000 can control incident light and has an appropriate size that can be provided in a slim and compact structure while maintaining optical performance. can

[Equation 19-1]

CA_L1S2 ≤ CA_L2S2 ≤ CA_L3S2

CA_L1S2 ≤ CA_L2S1 ≤ CA_L3S1

CA_L1S2 ≤ CA_L2S1 ≤ CA_L2S2 ≤ CA_L3S1 ≤ CA_L3S2

In Equation 19-1, CA_L1S2 is the effective diameter size of the surface on which the diaphragm is disposed at room temperature (about 22° C.). That is, CA_L1S2 is the effective diameter (CA, Clear Aperture) of the sensor side surface (second surface S2) of the first lens 110, and CA_L2S1 is the second lens 120 at room temperature (about 22° C.). ) of the effective diameter (CA, Clear Aperture) of the object-side surface (the third surface S3), and CA_L2S2 is the object-side surface (the fourth surface (fourth surface) S4)) is the size of the effective diameter (CA, Clear Aperture), and L3S1 is the size of the effective diameter of the object side surface (the fifth surface S5) of the third lens 130 (CA, clear aperture), and CA_L3S2 is the size of the effective diameter of the sensor side (sixth surface S6) of the third lens 130 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 19-1, that is, the effective diameter of the lens surface on which the diaphragm is disposed or the lens surface closest to the iris is larger than the effective diameter of the lens disposed close to the sensor. In the case of small or when the effective diameter of each surface of the lens increases from the iris to the sensor side, the optical system 1000 can control the incident light and has an appropriate size that can be provided in a slim and compact structure while maintaining optical performance can have

[Equation 20]

0.35 < d12 / D_1 < 0.5

In Equation 20, d12 is the distance (mm) from the optical axis OA of the first lens 110 and the second lens 120 at room temperature (about 22° C.), and D_1 is at room temperature (about 22° C.) The central thickness of the first lens 110 is the thickness (mm) on the optical axis OA of the first lens 110 . (See Fig. 30)

When the optical system 1000 according to the embodiment satisfies Equation 20, the optical system 1000 may control incident light and may have improved aberration control characteristics.

[Equation 21]

0.7 ≤ CA_S _max / ImgH ≤ 1

In Equation 21, CA_Smax is the size of the effective diameter of the lens surface having the largest effective diameter CA at room temperature (about 22° C.) among the lens surfaces of the plurality of lenses 100 included in the optical system 1000 ( CA).

In addition, ImgH is from the field center 0 field region of the image sensor 300 overlapping the optical axis OA at room temperature (about 22° C.) to the 1.0 field region of the image sensor 300 . It is twice the distance in the vertical direction of the optical axis OA. That is, the ImgH denotes an overall diagonal length (mm) of the image sensor 300 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 21, the optical system 1000 has good optical performance at the center and the periphery of the field of view (FOV), and may be provided in a slim and compact structure.

[Equation 22]

3 ≤ EFL ≤ 5

In Equation 22, EFL (Effective Focal Length) means an effective focal length (mm) of the optical system 1000 at room temperature (about 22° C.).

[Equation 23]

50 degree ≤ FOV ≤ 70 degree

In Equation 23, FOV means an angle of view (FOV) of the optical system 1000 in environments of room temperature (about 22° C.), low temperature (about -40° C.), and high temperature (about 99° C.).

[Equation 24]

1 < TTL / ImgH < 1.4

In Equation 24, TTL is at room temperature (about 22° C.) in the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the upper surface of the image sensor 300. distance (mm).

In addition, ImgH is from the field center 0 field region of the image sensor 300 overlapping the optical axis OA at room temperature (about 22° C.) to the 1.0 field region of the image sensor 300 . It is twice the distance in the vertical direction of the optical axis OA. That is, the ImgH denotes an overall diagonal length (mm) of the image sensor 300 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 24, the optical system 1000 is a BFL for applying a relatively large image sensor 300, for example, a large image sensor 300 of about 1 inch. (Back focal length) can be secured and it can have a smaller TTL, so it can realize high quality and have a slim structure.

[Equation 25]

0.2 < BFL / ImgH < 0.5

In Equation 25, BFL (Back focal length) is at room temperature (about 22° C.) in the optical axis (OA) from the apex of the sensor side of the lens closest to the image sensor 300 to the top surface of the image sensor 300 . distance (mm).

In addition, ImgH is from the field center 0 field region of the image sensor 300 overlapping the optical axis OA at room temperature (about 22° C.) to the 1.0 field region of the image sensor 300 . It is twice the distance in the vertical direction of the optical axis OA. That is, the ImgH denotes an overall diagonal length (mm) of the image sensor 300 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 25, the optical system 1000 is configured to apply a relatively large image sensor 300, for example, a large image sensor 300 of about 1 inch. Back focal length (BFL) can be secured, and the distance between the last lens and the image sensor 300 can be minimized, so that good optical properties can be obtained at the center and the periphery of the field of view (FOV).

[Equation 26]

3 < TTL / BFL < 5

In Equation 26, TTL is in the optical axis OA from the object side surface (first surface S1) of the first lens 110 to the upper surface of the image sensor 300 at room temperature (about 22° C.) distance (mm).

In addition, the back focal length (BFL) is the distance in the optical axis (OA) from the apex of the sensor side of the lens closest to the image sensor 300 to the upper surface of the image sensor 300 at room temperature (about 22° C.) ( mm).

When the optical system 1000 according to the embodiment satisfies Equation 26, the optical system 1000 may be provided in a slim and compact manner while securing the BFL.

[Equation 27]

0.6 < EFL / TTL < 0.8

In Equation 27, EFL (Effective Focal Length) means an effective focal length (mm) of the optical system 1000 at room temperature (about 22° C.).

In addition, TTL is the distance in the optical axis OA from the object-side surface (first surface S1) of the first lens 110 to the upper surface of the image sensor 300 at room temperature (about 22° C.) ( mm).

When the optical system 1000 according to the embodiment satisfies Equation 27, the optical system 1000 may be provided in a slim and compact manner.

[Equation 28]

2 < EFL / BFL < 3

In Equation 28, EFL (Effective Focal Length) means an effective focal length (mm) of the optical system 1000 at room temperature (about 22° C.).

In addition, the back focal length (BFL) is the distance in the optical axis (OA) from the apex of the sensor side of the lens closest to the image sensor 300 to the upper surface of the image sensor 300 at room temperature (about 22° C.) ( mm).

When the optical system 1000 according to the embodiment satisfies Equation 28, the optical system 1000 may have a set angle of view, an appropriate focal length, and may be provided in a slim and compact manner. In addition, the optical system 1000 may minimize the distance between the last lens and the image sensor 300 , and thus may have good optical characteristics at the periphery of the field of view (FOV).

[Equation 29]

0.7 < EFL / ImgH < 1

In Equation 29, EFL (Effective Focal Length) means an effective focal length (mm) of the optical system 1000 at room temperature (about 22° C.).

In addition, ImgH is from the field center 0 field region of the image sensor 300 overlapping the optical axis OA at room temperature (about 22° C.) to the 1.0 field region of the image sensor 300 . It is twice the distance in the vertical direction of the optical axis OA. That is, the ImgH denotes an overall diagonal length (mm) of the image sensor 300 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 29, the optical system 1000 is improved by applying a relatively large image sensor 300, for example, a large image sensor 300 of about 1 inch. It may have aberration characteristics.

[Equation 30]

0.2 < D_1_ET / D_1 < 1.7

In Equation 30, D_1 is the central thickness of the first lens 110 at room temperature (about 22° C.) and is the thickness (mm) on the optical axis OA of the first lens 110 . In addition, D_1_ET means a thickness (mm) in the optical axis OA direction at the end of the effective area of the first lens 110 at room temperature (about 22° C.). In detail, referring to FIG. 30 , D_1_ET is the end of the effective area of the object-side surface (first surface S1) of the first lens 110 and the sensor-side surface (second surface S2) of the first lens 110. )) means the distance (mm) in the direction of the optical axis (OA) between the ends of the effective area. D_1_ET may be a thickness of the flange outside the effective diameter of the first lens 110 .

When the optical system 1000 according to the embodiment satisfies Equation 30, the optical system 1000 may control incident light and may have improved aberration control characteristics in a temperature range of low to high temperature.

In detail, Equation 30 may satisfy 0.4 < D_1_ET / D_1 < 1.5 for improved incident light control characteristics and aberration control characteristics in a temperature range of low to high temperature. In more detail, Equation 30 may satisfy 0.7 < D_1_ET / D_1 < 1.3 for more improved incident light control characteristics and aberration control characteristics.

[Equation 31]

0.3 < D_2_ET / D_2 < 1.7

In Equation 31, D_2 is the central thickness of the second lens 120 at room temperature (about 22° C.) and is the thickness (mm) of the second lens 120 on the optical axis OA. In addition, D_2_ET means a thickness (mm) in the optical axis OA direction at the end of the effective area of the second lens 120 at room temperature (about 22° C.). In detail, referring to FIG. 30 , D_2_ET is the end of the effective area of the object-side surface (third surface S3) of the second lens 120 and the sensor-side surface (the fourth surface S4) of the second lens 120. )) means the distance (mm) in the direction of the optical axis (OA) between the ends of the effective area. D_2_ET may be a thickness of the flange outside the effective diameter of the second lens.

When the optical system 1000 according to the embodiment satisfies Equation 31, the optical system 1000 may have improved chromatic aberration control characteristics in a temperature range of a low temperature to a high temperature.

In detail, Equation 31 may satisfy 0.4 < D_2_ET / D_2 < 1.5 for more improved chromatic aberration control characteristics in a temperature range of low to high temperature. More specifically, Equation 31 may satisfy 0.5 ≤ D_2_ET / D_2 ≤ 1.3 for more improved chromatic aberration control characteristics.

[Equation 32]

0.3 < D_3_ET / D_3 < 1.7

In Equation 32, D_3 is the central thickness of the third lens 130 at room temperature (about 22° C.) and is the thickness (mm) on the optical axis OA of the third lens 130 . In addition, D_3_ET means a thickness (mm) in the optical axis OA direction at the end of the effective area of the third lens 130 at room temperature (about 22° C.). In detail, referring to FIG. 30 , D_3_ET is the end of the effective area of the object-side surface (fifth surface S5) of the third lens 130 and the sensor-side surface (sixth surface S6) of the third lens 130. )) means the distance (mm) in the direction of the optical axis (OA) between the ends of the effective area. D_3_ET may be a thickness of the flange outside the effective diameter of the third lens.

When the optical system 1000 according to the embodiment satisfies Equation 30, the optical system 1000 may have improved distortion control characteristics in a temperature range of low to high temperature, and have good optical performance in the periphery of the field of view (FOV). can

In detail, Equation 32 may satisfy 0.5 < D_3_ET / D_3 < 1.5 for more improved distortion control characteristics in various temperature ranges. In more detail, Equation 32 may satisfy 0.7 < D_3_ET / D_3 < 1.3 for more improved distortion control characteristics.

[Equation 33]

0.1 < d23 / d23_max < 1

In Equation 33, d23 is the distance (mm) at the optical axis OA of the second lens 120 and the third lens 130 at room temperature (about 22° C.), and d23_max is at room temperature (about 22° C.) The largest distance among the distances in the optical axis OA direction between the sensor-side surface (the fourth surface S4) of the second lens 120 and the object-side surface (the fifth surface S5) of the third lens 130 (mm) means.

When the optical system 1000 according to the embodiment satisfies Equation 33, the optical system 1000 may improve characteristics of chromatic aberration and distortion aberration at the periphery of the angle of view (FOV) in a temperature range of low to high temperature.

In detail, Equation 33 may satisfy 0.2 < d23 / d23_max < 0.9 in order to further improve the optical performance of the periphery of the field of view (FOV) in various temperature ranges. More specifically, Equation 33 may satisfy 0.25 < d23 / d23_max < 0.8 in order to further improve the optical performance of the peripheral part in various temperature ranges.

[Equation 34]

1 < d23_Sag_L3S1_max / d23 < 5

In Equation 34, d23 is the distance (mm) in the optical axis OA of the second lens 120 and the third lens 130 at room temperature (about 22° C.), and d23_Sag_L3S1_max is the third lens 130 . from the maximum Sag value of the object side surface (fifth surface S5) of It means the distance (mm) in the direction of the optical axis (OA). (See Fig. 30)

When the optical system 1000 according to the embodiment satisfies Equation 34, the optical system 1000 may improve the optical performance of the peripheral portion of the field of view (FOV) in a temperature range of a low temperature to a high temperature.

In detail, Equation 34 may satisfy 1.3 < d23_Sag_L3S1_max / d23 < 4 in order to further improve the optical performance of the periphery of the field of view (FOV) in various temperature ranges. More specifically, Equation 34 may satisfy 1.5 < d23_Sag_L3S1_max / d23 < 3 in order to further improve the optical performance of the peripheral part in various temperature ranges.

[Equation 35]

0.2 < L_Sag_L3S1 / CA_L3S1 < 1

In Equation 35, L_Sag_L3S1 is perpendicular to the optical axis OA from the optical axis OA to the maximum Sag value of the object-side surface (the fifth surface S5) of the third lens 130 at room temperature (about 22° C.) It means a distance in the direction, and CA_L3S1 means the size of the effective diameter of the object-side surface (the fifth surface S5) of the third lens 130 at room temperature (about 22° C.). (See Fig. 30)

When the optical system 1000 according to the embodiment satisfies Equation 35, the optical system 1000 may improve the optical performance of the peripheral portion of the field of view (FOV) in a temperature range of a low temperature to a high temperature.

In detail, Equation 35 may satisfy 0.3 < L_Sag_L3S1 / CA_L3S1 < 0.9 in order to further improve the optical performance of the periphery of the field of view (FOV) in various temperature ranges. More specifically, Equation 35 may satisfy 0.4 < L_Sag_L3S1 / CA_L3S1 < 0.8 in order to further improve the optical performance of the peripheral part in various temperature ranges.

[Equation 35-1]

0.02 < |Sag_L3S1_max| < 0.5

In Equation 35-1, Sag_L3S1_max is the Sag value of the object-side surface (the fifth surface S5) of the third lens 130 on the optical axis OA and the third lens 130 at room temperature (about 22° C.) ) means the difference from the maximum Sag value of the object side surface (the fifth surface S5).

When the optical system 1000 according to the embodiment satisfies Equation 35-1, the optical system 1000 may improve the optical performance of the peripheral portion of the field of view (FOV) in a temperature range of a low temperature to a high temperature.

In detail, Equation 35-1 is 0.04 < |Sag_L3S1_max| to further improve the optical performance of the periphery of the FOV in various temperature ranges. < 0.3 may be satisfied. More specifically, the above Equation 34 shows that 0.05 < |Sag_L3S1_max| < 0.1 may be satisfied.

[Equation 36]

0.2 < L_Sag_L3S2 / CA_L3S2 < 1

In Equation 36, L_Sag_L3S2 is perpendicular to the optical axis OA from the optical axis OA to the maximum Sag value of the sensor side (sixth surface S6) of the third lens 130 at room temperature (about 22° C.) It means a distance in the direction, and CA_L3S2 means the size of the effective diameter of the sensor-side surface (sixth surface S6) of the third lens 130 at room temperature (about 22° C.). (See Fig. 30)

In detail, Equation 36 may satisfy 0.3 < L_Sag_L3S2/ CA_L3S2 < 0.9 in order to further improve optical performance of the periphery of the field of view (FOV) in various temperature ranges. More specifically, Equation 36 may satisfy 0.4 < L_Sag_L3S2 / CA_L3S2 < 0.7 in order to further improve the optical performance of the peripheral part in various temperature ranges.

When the optical system 1000 according to the embodiment satisfies at least one of Equations 35 and 36, the optical system 1000 may improve chromatic aberration and aberration characteristics in a temperature range of low to high temperature, and a field of view (FOV). It can have good optical performance not only at the center but also at the periphery.

[Equation 36-1]

0.05 < |Sag_L3S2_max| < 0.5

In Equation 36-1, |Sag_L3S2_max| is the Sag value of the sensor side (sixth surface S6) of the third lens 130 in the optical axis OA and the third lens at room temperature (about 22° C.) (130) means the difference from the maximum Sag value of the sensor side (sixth surface (S6)).

When the optical system 1000 according to the embodiment satisfies Equation 36-1, the optical system 1000 may improve the optical performance of the periphery of the field of view (FOV) in a temperature range of a low temperature to a high temperature.

In detail, 0.1 < |Sag_L3S2_max| < 0.3 may be satisfied. More specifically, the above Equation 34 is 0.15 < |Sag_L3S2_max| < 0.2 may be satisfied.

[Equation 37]

0.2 < L3S2_max_sag to Sensor / BFL < 1

In Equation 37, BFL (Back focal length) means the distance (mm) from the vertex of the sensor side of the lens closest to the image sensor 300 to the upper surface of the image sensor 300 in the optical axis OA. .

In addition, L3S2_max_sag to Sensor is the optical axis (OA) direction distance from the maximum Sag value of the sensor side (sixth surface S6) of the third lens 130 to the image sensor 300 at room temperature (about 22° C.) (mm) means.

When the optical system 1000 according to the embodiment satisfies Equation 37, the optical system 1000 may improve distortion aberration characteristics, have good optical performance in the periphery of the field of view (FOV), and facilitate assembly. There is this.

In detail, Equation 37 may satisfy 0.3 < L3S2_max_sag to Sensor / BFL < 0.95 in order to improve distortion aberration characteristics in various temperature ranges and to further improve optical performance and assembly easiness of the periphery of the field of view (FOV). In more detail, Equation 37 may satisfy 0.4 < L3S2_max_sag to Sensor / BFL < 0.9 in order to further improve distortion aberration characteristics in various temperature ranges, optical performance of the periphery of the field of view (FOV), and ease of assembly.

[Equation 38]

3 < ∑Index < 10

In Equation 38, ∑Index means the sum of refractive indices at the d-line of each of the first to third lenses 110 , 120 , 130 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 38, it is possible to control the TTL of the optical system 1000 in a temperature range of low to high temperature, and to have improved chromatic aberration and resolution characteristics.

[Equation 39]

10 < ∑Abb / ∑Index < 50

In Equation 39, ∑Index means the sum of refractive indices at the d-line of each of the first to third lenses 110, 120, and 130 at room temperature (about 22° C.). In addition, ∑Abb denotes the sum of Abbe's numbers of each of the first to third lenses 110 , 120 , and 130 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 39, the optical system 1000 may have improved aberration characteristics and resolving power in a temperature range of a low temperature to a high temperature.

[Equation 40]

1 < CA_Smax / CA_Smin < 5

In Equation 40, CA_Smax is the size of the effective diameter of the lens surface having the largest effective diameter CA at room temperature (about 22° C.) among the lens surfaces of the plurality of lenses 100 included in the optical system 1000 ( CA). In addition, CA_Smin is the size of the effective diameter of the lens surface having the smallest effective diameter CA at room temperature (about 22° C.) among the lens surfaces of the plurality of lenses 100 included in the optical system 1000 (CA) to be.

When the optical system 1000 according to the embodiment satisfies Equation 40, the optical system 1000 may be provided in a slim and compact structure, and may have an appropriate size for realizing optical performance in a temperature range of low to high temperature. have.

[Equation 41]

1 < CA_Smax / CA_Aver < 3

In Equation 41, CA_Smax is the size of the effective diameter of the lens surface having the largest effective diameter CA at room temperature (about 22° C.) among the lens surfaces of the plurality of lenses 100 included in the optical system 1000 ( CA). CA_Aver means the average (mm) of the size of the effective diameter CA at room temperature (about 22° C.) of the lens surfaces (object side, sensor side) of the plurality of lenses 100 included in the optical system 1000 . .

When the optical system 1000 according to the embodiment satisfies Equation 41, the optical system 1000 may be provided in a slim and compact structure, and may have an appropriate size for realizing optical performance in a low to high temperature temperature range. have.

[Equation 42]

0.1 < CA_Smin / CA_Aver < 1

In Equation 42, CA_Smin is the size of the effective diameter of the lens surface having the smallest effective diameter CA at room temperature (about 22° C.) among the lens surfaces of the plurality of lenses 100 included in the optical system 1000 ( CA). CA_Aver means the average (mm) of the size of the effective diameter CA at room temperature (about 22° C.) of the lens surfaces (object-side, sensor-side) of the plurality of lenses 100 included in the optical system 1000 . .

When the optical system 1000 according to the embodiment satisfies Equation 42, the optical system 1000 may be provided in a slim and compact structure, and may have an appropriate size for realizing optical performance in a temperature range of low to high temperature. have.

[Equation 43]

0.1 < CA_Smax / ImgH < 1

In Equation 43, CA_Smax is the size of the effective diameter of the lens surface having the largest effective diameter CA at room temperature (about 22° C.) among the lens surfaces of the plurality of lenses 100 included in the optical system 1000 ( CA).

In addition, ImgH is from the field center 0 field region of the image sensor 300 overlapping the optical axis OA at room temperature (about 22° C.) to the 1.0 field region of the image sensor 300 . It is twice the distance in the vertical direction of the optical axis OA. That is, the ImgH denotes an overall diagonal length (mm) of the image sensor 300 at room temperature (about 22° C.).

When the optical system 1000 according to the embodiment satisfies Equation 43, the optical system 1000 has good optical performance in the center and the periphery of the field of view (FOV) in the temperature range of low to high temperature, and has a slim and compact structure. can be provided.

[Equation 44]

0.5 < CA_L1S2 / CA_L2S1 < 1

In Equation 44, CA_L1S2 means the size (mm) of the effective diameter of the sensor side (second surface S2) of the first lens 110 at room temperature (about 22° C.), and CA_L2S1 is room temperature (about 22° C.) ) means the size (mm) of the effective diameter of the object-side surface (third surface S3) of the second lens 120 .

When the optical system 1000 according to the embodiment satisfies Equation 44, the optical system 1000 may have improved chromatic aberration control characteristics in a temperature range of a low temperature to a high temperature.

[Equation 45]

In Equation 45, Z is Sag, which may mean a distance in the optical axis direction from an arbitrary position on the aspherical surface to the vertex of the aspherical surface.

In addition, Y may mean a distance in a direction perpendicular to the optical axis from any position on the aspherical surface to the optical axis.

Also, c may mean a curvature of the lens, and K may mean a conic constant.

Also, A, B, C, D, ... may mean an aspheric constant.

In addition, a chief ray angle (CRA) of the optical system 1000 according to the embodiment may be about 20 degrees to about 35 degrees. In detail, the chief ray incidence angle CRA of the optical system 1000 may be about 25 degrees to about 30 degrees in a 1.0 field. In addition, the optical distortion of the optical system 1000 may be ±4% or less in a 1.0 field.

In particular, in the optical system 1000 according to the embodiment, the first lens 110 may include a material different from that of the second lens 120 and the third lens 130 . For example, the first lens 110 may be made of a glass material, and the second lens 120 and the third lens 130 may be made of the same plastic material.

Temperature (℃) Refractive index according to the wavelength of the first lens 656.3nm
(C-line) 632.8nm 587.6nm
(d-line) 546.1nm
(e-line) 486.1nm
(F-line) 435.8nm
(g-line) -40 2.0396 2.043 2.0599 2.06 2.0784 2.102 -20 2.0396 2.043 2.0599 2.06 2.0785 2.1021 -10 2.0396 2.043 2.0600 2.0601 2.0786 2.1022 0 2.0397 2.0431 2.0600 2.0601 2.0787 2.1023 10 2.0397 2.0431 2.0600 2.0601 2.0787 2.1023 20 2.0397 2.0431 2.0601 2.0601 2.0787 2.1023 30 2.0397 2.0431 2.0601 2.0602 2.0788 2.1025 40 2.0397 2.0431 2.0602 2.0603 2.0789 2.1026 50 2.0398 2.0432 2.0603 2.0603 2.0789 2.1026 60 2.0398 2.0432 2.0604 2.0603 2.079 2.1027 70 2.0398 2.0432 2.0605 2.0604 2.079 2.1028 80 2.0398 2.0432 2.0605 2.0604 2.0791 2.1029 90 2.0398 2.0433 2.0606 2.0604 2.0791 2.1029

Temperature (℃) Refractive index according to the wavelength of the second lens and the third lens 1014nm
(t-line) 643.8nm
(C'-line) 587.6nm
(d-line) 546.1nm
(e-line) 480nm
(F'-line) 435.8nm
(g-line) -40 1.6373 1.6584 1.6684 1.6740 1.6924 1.7121 -20 1.6348 1.6557 1.6657 1.6711 1.6893 1.7088 -10 1.6336 1.6544 1.6644 1.6696 1.6877 1.7072 20 1.6324 1.6530 1.6603 1.6682 1.6861 1.7056 30 1.6288 1.6489 1.6590 1.6637 1.6814 1.7006 40 1.6276 1.6476 1.6577 1.6623 1.6799 1.6990 50 1.6263 1.6462 1.6563 1.6608 1.6783 1.6973 60 1.6251 1.6449 1.6550 1.6593 1.6767 1.6957 70 1.6239 1.6435 1.6536 1.6578 1.6752 1.6940 80 1.6227 1.6422 1.6523 1.6564 1.6736 1.6924 90 1.6215 1.6408 1.6510 1.6549 1.6720 1.6907

In detail, Table 1 is data on the refractive index of the first lens 110 for light of various wavelengths in a temperature range of low temperature (-40°C) to high temperature (90°C), and FIG. 4 is the first lens according to temperature change (110) is a graph of the refractive index change.

In addition, Table 2 is data on the refraction of the second lens 120 and the third lens 130 for light of various wavelengths in the temperature range of low temperature (-40 ℃) to high temperature (90 ℃), Figure 5 is It is a graph of the change in refractive index of the second lens 120 and the third lens 130 according to the temperature change.

Referring to Tables 1 and 2, the first lens 110 , the second lens 120 , and the third lens 130 may have different refractive index change characteristics according to a change in temperature.

First, referring to Tables 1 and 4, it can be seen that the first lens 110 has a very small refractive index that changes depending on the temperature in a temperature range of a low temperature (about -40 ℃) to a high temperature (about 99 ℃). . In particular, it can be seen that the change (dnt_1/dt) of the refractive index according to the temperature change of the first lens 110 has a positive number as in Equation 3 and a positive slope as shown in FIG. 4 .

On the other hand, referring to Tables 2 and 5, the second lens 120 and the third lens 130 change depending on the temperature in the temperature range of a low temperature (about -40 ℃) to a high temperature (about 99 ℃). It can be seen that the refractive index is relatively large compared to that of the first lens 110 . In particular, the change in refractive index (dnt_2/dt, dnt_3/dt) according to the temperature change of the second lens 120 and the third lens 130 has a negative number as shown in Equation 3, and is negative as shown in FIG. 5 . It can be seen that there is a slope.

In this case, the first lens 110 may have a refractive index greater than that of the second lens 120 and the third lens 130 . In detail, the first lens 110 has a refractive index greater than that of the two lenses 120 and 130 to compensate for the second lens 120 and the third lens 130 having relatively large refractive index changes according to temperature changes. can have

In addition, the first lens 110 includes the second lens 120 and the third lens 130 to compensate for the second lens 120 and the third lens 130 having relatively large refractive index changes according to temperature changes. It may have a larger diopter value than the lens 130 . Accordingly, the first lens 110 can effectively distribute the power of the optical system 1000 in a temperature range of a low temperature (about -40°C) to a high temperature (about 99°C). Accordingly, the optical system 1000 according to the embodiment may minimize or prevent deterioration of optical properties in an environment of various temperatures, and may have improved optical performance.

That is, in the optical system 1000 according to the embodiment, the first lens 110 may be provided with a material different from that of the second lens 120 and the third lens 130 , and the above-described Equations 1 to At least one of Equation 44 may be satisfied. Accordingly, the optical system 1000 may prevent or minimize changes in optical properties according to temperature, and may have improved optical properties at various temperatures.

In addition, the optical system 1000 according to the embodiment can prevent or minimize changes in distortion and aberration characteristics at various temperatures by satisfying at least one of Equations 1 to 44, thereby having improved optical characteristics. can

In addition, in the optical system 1000 according to the embodiment, a distance between the plurality of lenses 100 may have a value set according to an area.

The first lens 110 and the second lens 120 may be spaced apart from each other by a first interval. The first interval may be an optical axis (OA) direction interval between the first lens 110 and the second lens 120 .

The first interval may vary according to a position between the first lens 110 and the second lens 120 . In detail, when the first interval has the optical axis OA as the starting point and the effective area end of the sensor-side surface (the second surface S2) of the first lens 110 as the endpoint, the optical axis at the optical axis OA It can change as it goes in the direction perpendicular to (OA). That is, the first interval may change from the optical axis OA toward the end of the effective diameter of the second surface S2.

The first interval may decrease from the optical axis OA toward the first point L1 located on the second surface S2. Here, the first point L1 may be the end of the effective area of the second surface S2.

The first interval may have a maximum value in the optical axis OA. Also, the first interval may have a minimum value at the first point L1 . In this case, the maximum value of the first interval may be about 1.1 times or more of the minimum value. In detail, the maximum value of the first interval may satisfy about 1.1 times to about 3 times the minimum value.

The second lens 120 and the third lens 130 may be spaced apart from each other by a second interval. The second interval may be a distance in the optical axis OA direction between the second lens 120 and the third lens 130 .

The second interval may vary depending on a position between the second lens 120 and the third lens 130 . In detail, when the second interval has the optical axis OA as the starting point and the effective area end of the sensor side surface (the fourth surface S4) of the second lens 120 as the endpoint, the optical axis at the optical axis OA It can change as it goes in the direction perpendicular to (OA). That is, the second interval may change from the optical axis OA toward the end of the effective diameter of the fourth surface S4.

The second interval may increase from the optical axis OA toward the second point L2 located on the fourth surface S4. Here, the second point L2 may be the end of the effective area of the fourth surface S4.

The second interval may have a maximum value at the second point L2. Also, the second interval may have a minimum value in the optical axis OA. In this case, the maximum value of the second interval may be about twice or more than the minimum value. In detail, the maximum value of the second interval may satisfy about 2 to about 4 times the minimum value.

Accordingly, the optical system 1000 may have improved optical properties. In detail, the first lens 110 and the second lens 120, and the second lens 120 and the third lens 130 are set intervals according to the positions (first interval, second interval), respectively. spaced apart from each other, the optical system 1000 may prevent or minimize changes in optical properties in a temperature range of low to high temperature. Accordingly, the optical system and the camera module according to the embodiment may maintain improved optical properties in various temperature ranges.

The optical system 1000 according to the first embodiment will be described in more detail with reference to FIGS. 6 to 17 .

6 is a block diagram of an optical system according to the first embodiment. 7 is a graph of relative illumination for each field of the optical system according to the first embodiment, and FIG. 8 is data on distortion characteristics of the optical system according to the first embodiment. 9 to 17 are graphs of diffraction MTF and aberration diagrams for each temperature of the optical system according to the first embodiment.

6 to 17 , in the optical system 1000 according to the first embodiment, the first lens 110 , the second lens 120 , and the third lens 130 are sequentially arranged from the object side to the sensor side. ) and an image sensor 300 . The first to third lenses 110 , 120 , and 130 may be sequentially disposed along the optical axis OA of the optical system 1000 .

In addition, in the optical system 1000 according to the first embodiment, the sensor-side surface (the second surface S2 ) of the first lens 110 may serve as an diaphragm.

In addition, a filter 500 may be disposed between the plurality of lenses 100 and the image sensor 300 , and a cover glass 400 may be disposed between the filter 500 and the image sensor 300 . can be

lens noodle radius of curvature (mm) Thickness or spacing (mm) refractive index Abbesu Effective diameter (mm) first lens side 1 2.842 1.478 2.013 26.900 2.788 2nd side
(Stop) 4.145 0.673 1.460 second lens 3rd side -8.270 1.052 1.632 20.400 1.993 4th side -3.830 0.375 2.700 third lens page 5 1.748 0.591 1.632 20.400 3.186 page 6 1.560 0.279 3.940 filter page 7 1.E+18 0.300 1.513 54.500 4.169 page 8 1.E+18 0.500 4.275 cover glass page 9 1.E+18 0.400 1.513 54.500 4.548 page 10 1.E+18 0.045 4.689 image sensor page 11 1.E+18 0.000 4.529

Table 3 shows the radius of curvature of the first to third lenses 110 , 120 , and 130 according to the first embodiment, the thickness of each lens along the optical axis OA, and the optical axis OA. ), the distance between each lens, the refractive index for light in the t-line (1013.98 nm) wavelength band, Abbe's Number, and the size of the clear aperture (CA). Here, the lens data described in Table 3 are data at room temperature (about 22° C.).

6 and Table 3,

The first lens 110 of the optical system 1000 according to the first embodiment may have a glass material and have a positive (+) refractive power in the optical axis OA. In addition, in the optical axis OA, the first surface S1 of the first lens 110 may have a convex shape, and the second surface S2 may be concave. The first lens 110 may have a meniscus shape convex from the optical axis OA toward the object. The first surface S1 may be a sphere, and the second surface S2 may be a sphere.

Vertical height (mm) of the optical axis from the optical axis at the object-side surface of the first lens Sag (mm) of the object side of the first lens Vertical height of the optical axis from the optical axis at the sensor side of the first lens (mm) Sag (mm) of the sensor side of the first lens 0 0 0 0 0.2 0.007 0.2 0.0048 0.4 0.0283 0.4 0.0193 0.6 0.0641 0.6 0.0437 0.8 0.1149 0.8 0.0595 One 0.1817 One 0.0595 1.2 0.2658 1.2 0.0595 1.3 0.3147 1.3 0.0595 1.5 0.3147 1.5 0.0595 1.7 0.3147 1.7 0.0595 1.9 0.3147 1.9 0.0595

Vertical height of the optical axis from the optical axis (mm) Optical axis thickness of the first lens (mm) 0 1.4777 (D_1) 0.2 1.4755 0.4 1.4687 0.6 1.4573 0.8 1.4223 One 1.3555 1.2 1.2714 1.3 1.2225 (D_1_ET) 1.5 1.2225 1.7 1.2225 1.9 1.2225

Table 4 shows the vertical direction of the optical axis OA of the object-side surface (first surface S1) and the sensor-side surface (second surface S2) of the first lens 110 at room temperature (about 22° C.) Sag data according to height (0.2mm interval).

In addition, Table 5 is data on the lens thickness according to the vertical direction height (0.2 mm interval) of the optical axis (OA) at room temperature (about 22 ℃). In detail, D_1 in Table 5 is the central thickness of the first lens 110 and is the thickness (mm) of the first lens 110 on the optical axis OA. In addition, D_1_ET in Table 5 means a thickness (mm) in the optical axis OA direction at the end of the effective area of the first lens 110 . In detail, between the effective area end of the object-side surface (first surface S1) of the first lens 110 and the effective area end of the sensor-side surface (second surface S2) of the first lens 110 It means the distance (mm) in the direction of the optical axis (OA).

Referring to Tables 3, 4, and 5, the thickness of the first lens 110 in the optical axis OA direction may become thinner from the optical axis OA toward the end of the effective diameter of the first lens 110 . . In detail, the thickness in the optical axis OA direction of the first lens 110 may have a maximum value in the optical axis OA in the range from the optical axis OA to the effective mirror end of the second surface S2, It may have a minimum value at the end of the effective diameter of the two surfaces S2.

Accordingly, the first lens 110 may have improved aberration control characteristics by controlling the incident light.

The second lens 120 may be made of a plastic material and have positive (+) refractive power in the optical axis OA. In addition, in the optical axis OA, the third surface S3 of the second lens 120 may have a concave shape, and the fourth surface S4 may be convex. The second lens 120 may have a meniscus shape convex from the optical axis OA toward the sensor. The third surface S3 may be an aspherical surface, and the fourth surface S4 may be an aspherical surface.

Vertical height (mm) of the optical axis from the optical axis on the object side of the second lens Sag (mm) of the object side of the second lens Vertical height of the optical axis from the optical axis at the sensor side of the second lens (mm) Sag (mm) of the sensor side of the second lens 0 0 0 0 0.2 -0.0025 0.2 -0.0055 0.4 -0.0114 0.4 -0.0256 0.6 -0.0304 0.6 -0.0678 0.8 -0.0672 0.8 -0.1399 One -0.0951 One -0.2479 1.2 -0.0951 1.2 -0.3928 1.3 -0.0951 1.3 -0.4733 1.5 -0.0951 1.5 -0.4733 1.7 -0.0951 1.7 -0.4733 1.9 -0.0951 1.9 -0.4733

Vertical height of the optical axis from the optical axis (mm) Optical axis thickness of the second lens (mm) 0 1.0522 (D_2) 0.2 1.0492 0.4 1.0380 0.6 1.0148 0.8 0.9795 One 0.8994 1.2 0.7545 1.3 0.6740 (D_2_ET) 1.5 0.6740 1.7 0.6740 1.9 0.6740

Table 6 shows the vertical direction of the optical axis OA of the object-side surface (third surface S3) and the sensor-side surface (fourth surface S4) of the second lens 120 at room temperature (about 22° C.) Sag data according to height (0.2mm interval).

In addition, Table 7 is data on the lens thickness according to the vertical direction height (0.2 mm interval) of the optical axis OA at room temperature (about 22° C.). In detail, D_2 in Table 7 is the central thickness of the second lens 120 and is the thickness (mm) of the second lens 120 on the optical axis OA. In addition, D_2_ET in Table 7 means a thickness (mm) in the optical axis OA direction at the end of the effective area of the second lens 120 . In detail, between the effective area end of the object-side surface (third surface S3) of the second lens 120 and the effective area end of the sensor-side surface (fourth surface S4) of the second lens 120 It means the distance (mm) in the direction of the optical axis (OA).

Referring to Tables 3, 6, and 7, the thickness of the second lens 120 in the optical axis OA direction may become thinner from the optical axis OA toward the end of the effective diameter of the second lens 120 . . In detail, the thickness in the optical axis OA direction of the second lens 120 may have a maximum value in the optical axis OA in the range from the optical axis OA to the end of the effective mirror of the third surface S3, It may have a minimum value at the end of the effective diameter of the three surfaces S3.

Accordingly, the second lens 120 may prevent or minimize the change in optical properties according to the temperature in the low to high temperature range.

The third lens 130 may be made of a plastic material and may have positive (+) refractive power in the optical axis OA. Also, in the optical axis OA, the fifth surface S5 of the third lens 130 may have a convex shape, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape convex from the optical axis OA toward the object. The fifth surface S5 may be an aspherical surface, and the sixth surface S6 may be an aspherical surface.

Vertical height (mm) of the optical axis from the optical axis on the object side of the third lens Sag (mm) of the object side of the third lens Vertical height of the optical axis from the optical axis at the sensor side of the third lens (mm) Sag (mm) of the sensor side of the third lens 0 0 0 0 0.2 0.0109 0.2 0.0125 0.4 0.0377 0.4 0.0469 0.6 0.0663 0.6 0.0931 0.8 0.0771 0.8 0.1378 One 0.0541 One 0.1693 1.2 -0.0089 1.2 0.1799 1.3 -0.0535 1.3 0.1757 1.5 -0.1632 1.5 0.1452 1.7 -0.1632 1.7 0.0798 1.9 -0.1632 1.9 -0.0386

Vertical height of the optical axis from the optical axis (mm) Optical axis thickness of the third lens (mm) 0 0.5908 (D_3) 0.2 0.5924 0.4 0.6000 0.6 0.6176 0.8 0.6515 One 0.7060 1.2 0.7796 1.3 0.8200 1.5 0.8992 1.7 0.8338 1.9 0.7154 (D_3_ET)

Table 8 shows the vertical direction of the optical axis OA of the object-side surface (the fifth surface S5) and the sensor-side surface (the sixth surface S6) of the third lens 130 at room temperature (about 22° C.) Sag data according to height (0.2mm interval).

In addition, Table 9 is data on the lens thickness according to the vertical height of the optical axis (OA) at room temperature (about 22 ℃). In detail, D_3 of Table 9 is the central thickness of the first lens 110 and is the thickness (mm) on the optical axis OA of the first lens 110 . In addition, D_3_ET in Table 9 means a thickness (mm) in the optical axis OA direction at the end of the effective area of the third lens 130 . In detail, between the end of the effective area of the object-side surface (fifth surface S5) of the third lens 130 and the end of the effective area of the sensor-side surface (sixth surface S6) of the third lens 130 It means the distance (mm) in the direction of the optical axis (OA).

Referring to Tables 3, 8, and 9, the thickness of the third lens 130 in the optical axis OA direction may increase from the optical axis OA toward the end of the effective diameter of the third lens 130. . In detail, the thickness of the second lens 120 in the direction of the optical axis OA is the maximum value at the end of the effective mirror of the fifth surface S5 in the range from the optical axis OA to the end of the effective mirror of the fifth surface S5. , and may have a minimum value in the optical axis OA.

Accordingly, the third lens 130 may prevent or minimize the change in optical properties depending on the temperature in the low to high temperature range.

In this case, the refractive index of the first lens 110 may be different from the refractive power of the second lens 120 and the third lens 130 . For example, the refractive power of the first lens 110 may be about 1.1 times or more of the refractive power of the second lens 120 and the third lens 130 . In detail, the refractive power of the first lens 110 may be greater than or equal to about 1.15 times the refractive power of the second lens 120 and the third lens 130 . In more detail, the refractive power of the first lens 110 may be about 1.2 times or more of the refractive power of the second lens 120 and the third lens 130 . The refractive power of the second lens 120 and the third lens 130 may be equal to each other.

In addition, the Abbe's number of the first lens 110 may be different from that of the second lens 120 and the third lens 130 . For example, the Abbe's number of the first lens 110 may be There may be a difference between the Abbe's number of the second lens 120 and the third lens 130 within a range of 10 or less. In detail, the Abbe's number of the first lens 110 may be greater than the Abbe's number of the second lens 120 and the third lens 130 within a range of 10 or less.

In the optical system 1000 according to the first embodiment, the values of the aspheric coefficients of each lens surface are shown in Table 10 below.

first side (S1) 2nd side (S2) 3rd side (S3) 4th side (S4) 5th side (S5) 6th side (S6) K 41.46635 6.15608 -23.92412 -1.07733 A -0.06687 -0.18981 0.13438 -0.16382 B 0.13208 0.14023 -0.80885 -0.05903 C -0.56806 0.05504 1.38693 0.16777 D 1.10284 -0.40022 -1.52161 -0.15288 E -7.41E-01 6.75E-01 1.12E+00 8.16E-02 F -9.97E-01 -6.16E-01 -5.47E-01 -2.73E-02 G 2.43E+00 3.28E-01 1.67E-01 5.61E-03 H -1.86E+00 -9.49E-02 -2.91E-02 -6.49E-04 J 5.16E-01 1.16E-02 2.19E-03 3.23E-05

In addition, in the optical system 1000 according to the first embodiment, the interval (first interval) between the first lens 110 and the second lens 120 may be as shown in Table 11 below at room temperature (about 22° C.). have.

Vertical height of the optical axis from the optical axis at the sensor side of the first lens (mm) The distance in the optical axis direction of the air gap (d12) (mm)
(first interval) Vertical height (mm) of the optical axis from the optical axis on the object side of the second lens 0 0.6729 0 0.2 0.6656 0.2 0.4 0.6422 0.4 0.6 0.5988 0.6 0.8 (L1) 0.5462 0.8 (L1) One 0.5183 One 1.2 0.5183 1.2 1.3 0.5183 1.3 1.5 0.5183 1.5 1.7 0.5183 1.7 1.9 0.5183 1.9

Referring to Table 11, the first interval may decrease from the optical axis OA toward the first point L1, which is the end of the effective diameter of the second surface S2. Here, the value of the first point L1 is the sensor-side surface (second surface S2) of the first lens 110 and the object-side surface (third surface) of the second lens 120 facing each other. It is an approximate value of the effective radius value of the second surface S2 having a smaller effective diameter size among the surfaces S3), and means an approximate value of 1/2 of the effective diameter value of the second surface S2 described in Table 3.

The first interval may have a maximum value at the optical axis OA and a minimum value at the first point L1 . The maximum value of the first interval may be about 1.1 times to about 3 times the minimum value. For example, in the first embodiment, the maximum value of the first interval may be about 1.2 times the minimum value.

In addition, in the optical system 1000 according to the first embodiment, the interval (second interval) between the second lens 120 and the third lens 130 may be as shown in Table 12 below at room temperature (about 22° C.). have.

Vertical height of the optical axis from the optical axis at the sensor side of the second lens (mm) The distance in the optical axis direction of the air gap (d23) (mm)
(second interval) Vertical height (mm) of the optical axis from the optical axis on the object side of the third lens 0 0.3746 0 0.2 0.3910 0.2 0.4 0.4379 0.4 0.6 0.5087 0.6 0.8 0.5916 0.8 One 0.6766 One 1.2 0.7585 1.2 1.3 (L2) 0.7944 1.3 (L2) 1.5 0.6847 1.5 1.7 0.6847 1.7 1.9 0.6847 1.9

Referring to Table 12, the second interval may increase from the optical axis OA toward the second point L2, which is the end of the effective diameter of the fourth surface S4. Here, the value of the second point L2 is the sensor-side surface (fourth surface S4) of the second lens 120 and the object-side surface (fifth) of the third lens 130 facing each other. It is an approximate value of the effective radius value of the fourth surface S4 having a smaller effective diameter size among the surfaces S5), and means an approximate value of 1/2 of the effective diameter value of the fourth surface S4 described in Table 3.

The second interval may have a maximum value at the second point L2 and a minimum value on the optical axis OA. The maximum value of the second interval may be about 2 times to about 4 times the minimum value. For example, in the first embodiment, the maximum value of the second interval may be about 2.1 times the minimum value.

Accordingly, the optical system 1000 may have improved optical properties. In detail, the first lens 110 and the second lens 120, and the second lens 120 and the third lens 130 are set intervals according to the positions (first interval, second interval), respectively. spaced apart from each other, the optical system 1000 may prevent or minimize changes in optical properties in a temperature range of low to high temperature. Accordingly, the optical system and the camera module according to the embodiment may maintain improved optical properties in various temperature ranges.

first embodiment Diopter of the first lens (Diop_L1) (at room temperature (about 22℃)) 176.720 Diopter of the second lens (Diop_L2) (at room temperature (about 22℃)) 97.118 Diopter of the third lens (Diop_L3) (at room temperature (about 22℃)) 9.614 D_1_ET 1.222 mm D_2_ET 0.674 mm D_3_ET 0.715 mm f1 (room temperature (about 22℃)) 5.659 mm f2 (room temperature (about 22℃)) 10.297 mm f3 (room temperature (about 22℃)) 104.019 mm d23_max 7.944 mm d23_Sag_L3S1_max 0.5916 mm L_Sag_l3S1 0.8 mm L_Sag_l3S2 1.2 mm L3S2_max_sag to Sensor 1.344 mm CA_Smax 3.940 mm CA_Smin 1.460 mm CA_Aver 2.678 mm EFL (room temperature (22℃)) 3.9308 mm EFL (low temperature (-40℃)) 3.9070 mm EFL (high temperature (99℃)) 3.9606 mm TTL (room temperature (22℃)) 5.6925 mm TTL (low temperature (-40℃)) 5.6817 mm TTL (high temperature (99℃)) 5.7059 mm F# (at room temperature (22℃)) 2.0075 F# (low temperature (-40℃)) 1.9550 F# (high temperature (99℃)) 2.0226 ImgH (room temperature (22℃)) 4.6982 mm ImgH (low temperature (-40℃)) 4.7028 mm ImgH (high temperature (99℃)) 4.6932 mm BFL (room temperature (22℃)) 1.5243 mm Angle of view (FOV) (at room temperature (22℃)) 61.3374 degrees Angle of View (FOV) (Low Temperature (-40℃)) 61.6952 degrees Angle of View (FOV) (High Temperature (99℃)) 60.9010 degrees

formula first embodiment Equation 1 1.7 ≤ nt_1 ≤ 2.3 2.013 Equation 2 nt_2 < nt_1nt_3 < nt_1 satisfied Equation 3 dnt_1/dt ≥ 0
dnt_2/dt < 0
dnt_3/dt < 0
|dnt_2/dt| / |dnt_1/dt| > 20 satisfied Equation 4 1 ≤ |v1 - v2| ≤ 10
1 ≤ |v1 - v3| ≤ 10
50 ≤ v1 + v2 + v3 ≤ 200 satisfied Equation 5 0mm ≤ TTL ≤ 8mm 5.693 Equation 6 Diop_L1 > Diop_L2 > Diop_L3 satisfied Equation 7 1 < Diop_L1 / Diop_L2 < 2 1.820 Equation 8 10 < Diop_L1 / Diop_L3 < 600 18.382 Equation 9 1.8 ≤ F# ≤ 2.2 satisfied Equation 10 1mm ≤ D_1 ≤ 1.7mm 1.478 Equation 10-1 0.2 ≤ D_1/TTL ≤ 0.3 0.26 Equation 11 1 < D_1 / D_2 < 1.6 1.404 Equation 12 2 < D_1 / D_3 < 2.8 2.501 Equation 13 f1 < f2 < f3 satisfied Equation 14 0.4 < f1/f2 < 0.8 0.550 Equation 15 10 < f3 / f1 < 550 18.382 Equation 16 0.5 < L1R1 / L1R2 < 0.8 0.686 Equation 17 2 < L2R1 / L2R2 < 2.3 2.159039 Equation 18 1 < L3R1 / L3R1 < 1.3 1.120527 Equation 19 0.5 < CA_L1S1 / CA_L3S2 < 0.8 0.708 Equation 19-1 CA_L1S2 ≤ CA_L2S2 ≤ CA_L3S2 CA_L1S2 ≤ CA_L2S1 ≤ CA_L3S1
CA_L1S2 ≤ CA_L2S1 ≤ CA_L2S2 ≤ CA_L3S1 ≤ CA_L3S2 satisfied Equation 20 0.35 < d12 / D_1 < 0.5 0.455 Equation 21 0.7 ≤ CA_Smax / ImgH ≤ 1 0.839 Equation 22 3 ≤ EFL ≤ 5 satisfied Equation 23 FOV > 55 degrees satisfied Equation 24 1 < TTL / ImgH < 1.4 1.212 Equation 25 0.2 < BFL / ImgH < 0.5 0.324 Equation 26 3 < TTL / BFL < 5 3.734 Equation 27 0.6 < EFL / TTL < 0.8 0.691 Equation 28 2 < EFL / BFL < 3 2.579 Equation 29 0.7 < EFL / ImgH < 1 0.837 Equation 30 0.2 < D_1_ET / D_1 < 1.7 0.827 Equation 31 0.3 < D_2_ET / D_2 < 1.7 0.641 Equation 32 0.3 < D_3_ET / D_3 < 1.7 1.211 Equation 33 0.1 < d23 / d23_max < 1 0.472 Equation 34 1 < d23_Sag_L3S1_max / d23 < 5 1.579 Equation 35 0.2 < L_Sag_L3S1 / CA_L3S1 < 1 0.502 Equation 35-1 0.02 < |Sag_L3S1_max| < 0.5 0.771 Equation 36 0.2 < L_Sag_L3S2 / CA_L3S2 < 1 0.609 Equation 36-1 0.05 < |Sag_L3S2_max| < 0.5 0.1799 Equation 37 0.2 < L3S2_max_sag to Sensor / BFL < 1 0.882 Equation 38 3 < ∑Index <10 5.278 Equation 39 10 < ∑Abb / ∑Index <50 12.826 Equation 40 1 < CA_Smax / CA_Smin < 5 2.699 Equation 41 1 < CA_Smax / CA_Aver < 3 1.471 Equation 42 0.1 < CA_Smin / CA_Aver < 1 0.545 Equation 43 0.1 < CA_Smax / ImgH < 1 0.839 Equation 44 0.5 < CA_L1S2 / CA_L2S1 < 1 0.733

Table 13 relates to the items of the above-described equations in the optical system 1000 according to the first embodiment, and the diopter values of the first to third lenses 110 , 120 and 130 at room temperature (about 22° C.) , focal length, total track length (TTL), back focal length (BFL), F value, ImgH, effective focal length (EFL) value for each temperature of the optical system 1000 .

Table 14 shows the result values of Equations 1 to 44 described above in the optical system 1000 according to the first embodiment.

Referring to Table 14, it can be seen that the optical system 1000 according to the first embodiment satisfies at least one of Equations 1 to 44. In detail, it can be seen that the optical system 1000 according to the first embodiment satisfies all of Equations 1 to 44 above.

Accordingly, the optical system 1000 according to the first embodiment has an angle of view of about 60 degrees (60±2 degrees) in a temperature range of a low temperature (-40°C) to a high temperature (99°C), and FIGS. It may have optical characteristics as shown in FIG. 17 .

7 is a graph of relative illumination for each field of the optical system according to the first embodiment, and FIG. 8 is data on distortion characteristics of the optical system according to the first embodiment. In this case, FIGS. 7 and 8 are data obtained by measuring the optical system 1000 at room temperature (about 22° C.).

Referring to FIG. 7 , the optical system 1000 according to the first embodiment may have excellent light intensity ratio characteristics in the 0 field region (center region) to 1.0 field region (edge region) of the image sensor 300 . For example, the optical system 1000 may have an ambient light ratio of about 65% or more. In detail, in the optical system 1000, when the 0 field area is 100%, the light intensity ratio of the 0.5 field area may be about 80% or more, and the light intensity ratio of the 1.0 field area may be about 65% or more. In more detail, the light intensity ratio of the 1.0 field region may be about 70% or more.

Also, referring to FIG. 8 , the optical system 1000 according to the first embodiment may have a barrel distortion shape in which an edge portion of an image is curved outward, and has a distortion of about 0.7408% and about - It may have a TV-distortion of 1.0052%.

9 to 17 are graphs of diffraction MTF characteristics and aberration diagrams of the optical system 1000 according to temperature.

In detail, FIGS. 9 and 10 are graphs of the diffraction MTF characteristics of the optical system 1000 in a low-temperature (-40°C) environment, and FIGS. 12 and 13 are the optical systems in a room-temperature (22°C) environment. (1000) is a graph of the diffraction MTF characteristic, and FIGS. 15 and 16 are graphs of the diffraction MTF characteristic of the optical system 1000 in a high temperature (99° C.) environment.

11, 14 and 17 are graphs of aberration diagrams of the optical system 1000 in low-temperature (-40°C), room-temperature (22°C), and high-temperature (99°C) environments, respectively, from left to right This is a graph measuring Longitudinal Spherical Aberration, Astigmatic Field Curves, and Distortion. 11, 14, and 17, the X-axis may represent a focal length (mm) or distortion (%), and the Y-axis may mean the height of an image. In addition, the graph for spherical aberration is a graph for light in a wavelength band of about 920 nm, about 940 nm, and about 960 nm, and a graph for astigmatism and distortion aberration is a graph for light in a wavelength band of 940 nm.

In the aberration diagrams of FIGS. 11, 14 and 17, the closer the curves are to the Y-axis, the better the aberration correction function can be interpreted. Referring to FIGS. 11, 14 and 17, according to the first embodiment In the optical system 1000, it can be seen that measured values are adjacent to the Y-axis in almost all areas.

9 to 17 , in the optical system 1000 according to the first embodiment, there is little or no change in MTF characteristics and aberration characteristics even when the temperature is changed in the range of low temperature (-40°C) to high temperature (99°C). You can see it's not that big. In detail, it can be seen that the MTF characteristic change at low temperature (-40°C) and high temperature (99°C) is less than 10% of room temperature (22°C).

That is, the optical system 1000 according to the first embodiment may maintain excellent optical properties in various temperature ranges. In detail, in the optical system 1000 , the first lens 110 is made of a material different from that of the second lens 120 and the third lens 130 , for example, the first lens 110 is made of a glass material, and the second lens is made of glass. 120 and the third lens 130 may include a plastic material. Accordingly, when the temperature increases, the refractive index of the first lens 110 may increase, and the refractive index of the second lens 120 and the third lens 130 may decrease.

At this time, the first to third lenses 110 , 120 , and 130 according to the first embodiment are provided with a set refractive index, shape, thickness, etc. can be compensated Accordingly, the optical system 1000 may prevent or minimize changes in optical properties in a temperature range of low (-40°C) to high (99°C), and maintain improved optical properties.

Hereinafter, the optical system 1000 according to the second embodiment will be described in more detail with reference to FIGS. 18 to 29 .

18 is a block diagram of an optical system according to the second embodiment. 19 is a graph of relative illumination for each field of the optical system according to the second embodiment, and FIG. 20 is data on distortion characteristics of the optical system according to the second embodiment. 21 to 29 are graphs of diffraction MTFs and aberrations for each temperature of the optical system according to the second embodiment.

18 to 19 , in the optical system 1000 according to the second embodiment, the first lens 110 , the second lens 120 , and the third lens 130 are sequentially arranged from the object side to the sensor side. ) and an image sensor 300 . The first to third lenses 110 , 120 , and 130 may be sequentially disposed along the optical axis OA of the optical system 1000 .

Also, in the optical system 1000 according to the second embodiment, the sensor-side surface (the second surface S2 ) of the first lens 110 may serve as an aperture.

Also, a filter 500 may be disposed between the plurality of lenses 100 and the image sensor 300 , and a cover glass 400 may be disposed between the filter 500 and the image sensor 300 . can be

lens noodle radius of curvature (mm) Thickness or spacing (mm) refractive index Abbesu Effective diameter (mm) first lens side 1 2.836 1.430 2.013 26.900 2.784 2nd side
(Stop) 4.195 0.695 1.470 second lens 3rd side -7.801 1.021 1.632 20.400 2.030 4th side -3.725 0.389 2.696 third lens page 5 1.769 0.598 1.632 20.400 3.091 page 6 1.538 0.278 3.973 filter page 7 1.E+18 0.300 1.513 54.500 4.205 page 8 1.E+18 0.500 4.304 cover glass page 9 1.E+18 0.400 1.513 54.500 4.558 page 10 1.E+18 0.045 4.689 image sensor page 11 1.E+18 0.000 4.531

Table 15 shows the radius of curvature of the first to third lenses 110 , 120 , and 130 according to the second embodiment, the thickness of each lens along the optical axis OA, and the optical axis OA. ), the distance between each lens, the refractive index for light in the t-line (1013.98 nm) wavelength band, Abbe's Number, and the size of the clear aperture (CA). Here, the lens data described in Table 15 are data at room temperature (about 22° C.).

18 and Table 15,

The first lens 110 of the optical system 1000 according to the second embodiment may have a glass material and have a positive (+) refractive power in the optical axis OA. Also, in the optical axis OA, the first surface S1 of the first lens 110 may have a convex shape, and the second surface S2 may be concave. The first lens 110 may have a meniscus shape convex from the optical axis OA toward the object. The first surface S1 may be a sphere, and the second surface S2 may be a sphere.

Vertical height (mm) of the optical axis from the optical axis at the object-side surface of the first lens Sag (mm) of the object side of the first lens Vertical height of the optical axis from the optical axis at the sensor side of the first lens (mm) Sag (mm) of the sensor side of the first lens 0 0.0000 0 0.0000 0.2 0.0071 0.2 0.0048 0.4 0.0284 0.4 0.0191 0.6 0.0642 0.6 0.0431 0.8 0.1152 0.8 0.0588 One 0.1822 One 0.0588 1.2 0.2664 1.2 0.0588 1.4 0.3155 1.4 0.0588 1.6 0.3155 1.6 0.0588 1.8 0.3155 1.8 0.0588

Vertical height of the optical axis from the optical axis (mm) Optical axis thickness of the first lens (mm) 0 1.4304 (D_1) 0.2 1.4281 0.4 1.4211 0.6 1.4093 0.8 1.3740 One 1.3070 1.2 1.2228 1.4 1.1737 (D_1_ET) 1.6 1.1737 1.8 1.1737

Table 16 shows the vertical direction of the optical axis OA of the object-side surface (first surface S1) and the sensor-side surface (second surface S2) of the first lens 110 at room temperature (about 22° C.) Sag data according to height (0.2mm interval).

In addition, Table 17 is data on the lens thickness according to the vertical height (0.2 mm interval) of the optical axis OA at room temperature (about 22° C.). In detail, D_1 in Table 17 is the central thickness of the first lens 110 and is the thickness (mm) of the first lens 110 on the optical axis OA. In addition, D_1_ET in Table 17 means a thickness (mm) in the optical axis OA direction at the end of the effective area of the first lens 110 . In detail, between the effective area end of the object-side surface (first surface S1) of the first lens 110 and the effective area end of the sensor-side surface (second surface S2) of the first lens 110 It means the distance (mm) in the direction of the optical axis (OA).

Referring to Tables 15, 16, and 17, the thickness of the first lens 110 in the optical axis OA direction may become thinner from the optical axis OA toward the end of the effective diameter of the first lens 110. . In detail, the thickness in the optical axis OA direction of the first lens 110 may have a maximum value in the optical axis OA in the range from the optical axis OA to the effective mirror end of the second surface S2, It may have a minimum value at the end of the effective diameter of the two surfaces S2.

Accordingly, the first lens 110 may have improved aberration control characteristics by controlling the incident light.

The second lens 120 may be made of a plastic material and have positive (+) refractive power in the optical axis OA. In addition, in the optical axis OA, the third surface S3 of the second lens 120 may have a concave shape, and the fourth surface S4 may be convex. The second lens 120 may have a meniscus shape convex from the optical axis OA toward the sensor. The third surface S3 may be an aspherical surface, and the fourth surface S4 may be an aspherical surface.

Vertical height (mm) of the optical axis from the optical axis on the object side of the second lens Sag (mm) of the object side of the second lens Vertical height of the optical axis from the optical axis at the sensor side of the second lens (mm) Sag (mm) of the sensor side of the second lens 0 0.0000 0 0.0000 0.2 -0.0027 0.2 -0.0057 0.4 -0.0121 0.4 -0.0264 0.6 -0.0323 0.6 -0.0698 0.8 -0.0722 0.8 -0.1442 One -0.1036 One -0.2571 1.2 -0.1036 1.2 -0.4142 1.4 -0.1036 1.4 -0.5092 1.6 -0.1036 1.6 -0.5092 1.8 -0.1036 1.8 -0.5092

Vertical height of the optical axis from the optical axis (mm) Optical axis thickness of the second lens (mm) 0 1.0205 (D_2) 0.2 1.0175 0.4 1.0062 0.6 0.9830 0.8 0.9485 One 0.8670 1.2 0.7099 1.4 0.6149 (D_2_ET) 1.6 0.6149 1.8 0.6149

Table 18 shows the vertical direction of the optical axis OA of the object-side surface (third surface S3) and sensor-side surface (fourth surface S4) of the second lens 120 at room temperature (about 22° C.) Sag data according to height (0.2mm interval). In addition, Table 19 is data on the lens thickness according to the height (0.2 mm interval) in the vertical direction of the optical axis OA at room temperature (about 22° C.). In detail, D_1 of Table 19 is the central thickness of the first lens 110 and is the thickness (mm) of the first lens 110 on the optical axis OA. In addition, D_1_ET in Table 19 means a thickness (mm) in the optical axis OA direction at the end of the effective area of the first lens 110 . In detail, between the effective area end of the object-side surface (first surface S1) of the first lens 110 and the effective area end of the sensor-side surface (second surface S2) of the first lens 110 It means the distance (mm) in the direction of the optical axis (OA).

Referring to Tables 15, 18, and 19, the thickness of the second lens 120 in the optical axis OA direction may decrease from the optical axis OA toward the end of the effective diameter of the second lens 120. . In detail, the thickness in the optical axis OA direction of the second lens 120 may have a maximum value in the optical axis OA in the range from the optical axis OA to the end of the effective mirror of the third surface S3, It may have a minimum value at the end of the effective diameter of the three surfaces S3.

Accordingly, the second lens 120 may prevent or minimize the change in optical properties according to the temperature in the low to high temperature range.

The third lens 130 may be made of a plastic material and may have positive (+) refractive power in the optical axis OA. Also, in the optical axis OA, the fifth surface S5 of the third lens 130 may have a convex shape, and the sixth surface S6 may be concave. The third lens 130 may have a meniscus shape convex from the optical axis OA toward the object. The fifth surface S5 may be an aspherical surface, and the sixth surface S6 may be an aspherical surface.

Vertical height (mm) of the optical axis from the optical axis on the object side of the third lens Sag (mm) of the object side of the third lens Vertical height of the optical axis from the optical axis at the sensor side of the third lens (mm) Sag (mm) of the sensor side of the third lens 0 0.0000 0 0.0000 0.2 0.0108 0.2 0.0127 0.4 0.0373 0.4 0.0473 0.6 0.0649 0.6 0.0935 0.8 0.0739 0.8 0.1379 One 0.0475 One 0.1688 1.2 -0.0218 1.2 0.1787 1.4 -0.1336 1.4 0.1619 1.6 -0.1336 1.6 0.1122 1.8 -0.1336 1.8 0.0150

Vertical height of the optical axis from the optical axis (mm) Optical axis thickness of the third lens (mm) 0 0.5981 (D_3) 0.2 0.6000 0.4 0.6081 0.6 0.6267 0.8 0.6621 One 0.7194 1.2 0.7986 1.4 0.8936 1.6 0.8439 1.8 0.7467 (D_3_ET)

Table 20 shows the vertical direction of the optical axis OA of the object-side surface (the fifth surface S5) and the sensor-side surface (the sixth surface S6) of the third lens 130 at room temperature (about 22° C.) Sag data according to height (0.2mm interval).

In addition, Table 21 is data on the lens thickness according to the vertical height of the optical axis (OA) at room temperature (about 22 ℃). In detail, D_3 in Table 21 is the central thickness of the first lens 110 and is the thickness (mm) of the first lens 110 on the optical axis OA. In addition, D_3_ET in Table 21 means a thickness (mm) in the optical axis OA direction at the end of the effective area of the third lens 130 . In detail, between the end of the effective area of the object-side surface (fifth surface S5) of the third lens 130 and the end of the effective area of the sensor-side surface (sixth surface S6) of the third lens 130 It means the distance (mm) in the direction of the optical axis (OA).

Referring to Tables 15, 20, and 21, the thickness of the third lens 130 in the optical axis OA direction may increase from the optical axis OA toward the end of the effective diameter of the third lens 130. . In detail, the thickness of the second lens 120 in the direction of the optical axis OA is the maximum value at the end of the effective mirror of the fifth surface S5 in the range from the optical axis OA to the end of the effective mirror of the fifth surface S5. , and may have a minimum value in the optical axis OA.

Accordingly, the third lens 130 may prevent or minimize the change in optical properties depending on the temperature in the low to high temperature range.

In this case, the refractive index of the first lens 110 may be different from the refractive power of the second lens 120 and the third lens 130 . For example, the refractive power of the first lens 110 may be about 1.1 times or more of the refractive power of the second lens 120 and the third lens 130 . In detail, the refractive power of the first lens 110 may be greater than or equal to about 1.15 times the refractive power of the second lens 120 and the third lens 130 . In more detail, the refractive power of the first lens 110 may be about 1.2 times or more of the refractive power of the second lens 120 and the third lens 130 . The refractive power of the second lens 120 and the third lens 130 may be equal to each other.

In addition, the Abbe's number of the first lens 110 may be different from that of the second lens 120 and the third lens 130 . For example, the Abbe's number of the first lens 110 may be There may be a difference between the Abbe's number of the second lens 120 and the third lens 130 within a range of 10 or less. In detail, the Abbe's number of the first lens 110 may be greater than the Abbe's number of the second lens 120 and the third lens 130 within a range of 10 or less.

In the optical system 1000 according to the second embodiment, the values of the aspheric coefficients of each lens surface are shown in Table 22 below.

first side (S1) 2nd side (S2) 3rd side (S3) 4th side (S4) 5th side (S5) 6th side (S6) K 46.71759 5.57887 -18.95138 -1.34236 A -0.06605 -0.20032 0.04547 -0.17337 B 0.11766 0.17821 -0.54939 -0.02195 C -0.55000 -0.06063 0.89338 0.11721 D 1.33904 -0.21234 -0.90230 -0.10908 E -1.93E+00 4.76E-01 6.05E-01 5.71E-02 F 1.49E+00 -4.84E-01 -2.59E-01 -1.86E-02 G -3.25E-01 2.74E-01 6.60E-02 3.69E-03 H -2.84E-01 -8.30E-02 -8.51E-03 -4.11E-04 J 1.46E-01 1.04E-02 3.45E-04 1.96E-05

In addition, in the optical system 1000 according to the first embodiment, the interval (first interval) between the first lens 110 and the second lens 120 may be as shown in Table 23 below at room temperature (about 22° C.). have.

Vertical height of the optical axis from the optical axis at the sensor side of the first lens (mm) The distance in the optical axis direction of the air gap (d12) (mm)
(first interval) Vertical height (mm) of the optical axis from the optical axis on the object side of the second lens 0 0.6949 0 0.2 0.6874 0.2 0.4 0.6637 0.4 0.6 0.6195 0.6 0.8 (L1) 0.5639 0.8 (L1) One 0.5325 One 1.2 0.5325 1.2 1.4 0.5325 1.4 1.6 0.5325 1.6 1.8 0.5325 1.8

Referring to Table 23, the first interval may decrease from the optical axis OA toward the first point L1, which is the end of the effective diameter of the second surface S2. Here, the value of the first point L1 is the sensor-side surface (second surface S2) of the first lens 110 and the object-side surface (third surface) of the second lens 120 facing each other. It is an approximate value of the effective radius value of the second surface S2 having a smaller effective diameter size among the surfaces S3), and means an approximate value of 1/2 of the effective diameter value of the second surface S2 described in Table 15.

The first interval may have a maximum value at the optical axis OA and a minimum value at the first point L1 . The maximum value of the first interval may be about 1.1 times to about 3 times the minimum value. For example, in the first embodiment, the maximum value of the first interval may be about 1.2 times the minimum value.

In addition, in the optical system 1000 according to the first embodiment, the interval (second interval) between the second lens 120 and the third lens 130 may be as shown in Table 24 below at room temperature (about 22°C). have.

Vertical height of the optical axis from the optical axis at the sensor side of the second lens (mm) The distance in the optical axis direction of the air gap (d23) (mm)
(second interval) Vertical height (mm) of the optical axis from the optical axis on the object side of the third lens 0 0.3892 0 0.2 0.4057 0.2 0.4 0.4529 0.4 0.6 0.5239 0.6 0.8 0.6073 0.8 One 0.6938 One 1.2 0.7816 1.2 1.3 (L2) 0.8262 1.3 (L2) 1.4 0.7648 1.4 1.6 0.7648 1.6 1.8 0.7648 1.8

Referring to Table 24, the second interval may increase from the optical axis OA toward the second point L2, which is the end of the effective diameter of the fourth surface S4. Here, the value of the second point L2 is the sensor-side surface (fourth surface S4) of the second lens 120 and the object-side surface (fifth) of the third lens 130 facing each other. It is an approximate value of the effective radius value of the fourth surface S4 having a smaller effective diameter size among the surfaces S5), and means an approximate value of 1/2 of the effective diameter value of the fourth surface S4 described in Table 15.

The second interval may have a maximum value at the second point L2 and a minimum value on the optical axis OA. The maximum value of the second interval may be about 2 times to about 4 times the minimum value. For example, in the first embodiment, the maximum value of the second interval may be about 2.1 times the minimum value.

Accordingly, the optical system 1000 may have improved optical properties. In detail, the first lens 110 and the second lens 120, and the second lens 120 and the third lens 130 are set intervals according to the positions (first interval, second interval), respectively. spaced apart from each other, the optical system 1000 may prevent or minimize changes in optical properties in a temperature range of low to high temperature. Accordingly, the optical system and the camera module according to the embodiment may maintain improved optical properties in various temperature ranges.

second embodiment Diopter of the first lens (Diop_L1) (at room temperature (about 22℃)) 177.806 Diopter of the second lens (Diop_L2) (at room temperature (about 22℃)) 97.659 Diopter of the third lens (Diop_L3) (at room temperature (about 22℃)) 0.328 D_1_ET 1.174 mm D_2_ET 0.615 mm D_3_ET 0.747 mm f1 (room temperature (about 22℃)) 5.625 mm f2 (room temperature (about 22℃)) 10.240 mm f3 (room temperature (about 22℃)) 3049.434 mm d23_max 0.8262 mm d23_Sag_L3S1_max 0.6073 mm L_Sag_l3S1 0.8 mm L_Sag_l3S2 1.2 mm L3S2_max_sag to Sensor 0.1345 mm CA_Smax 3.973 mm CA_Smin 1.470 mm CA_Aver 2.674 mm EFL (room temperature (22℃)) 3.9530 mm EFL (low temperature (-40℃)) 3.9297 mm EFL (high temperature (99℃)) 3.9823 mm TTL (room temperature (22℃)) 5.6566 mm TTL (low temperature (-40℃)) 5.6458 mm TTL (high temperature (99℃)) 5.6699 mm F# (room temperature (22℃)) 2.0269 F# (low temperature (-40℃)) 2.0150 F# (high temperature (99℃)) 2.0417 ImgH (room temperature (22℃)) 4.7274 mm ImgH (low temperature (-40℃)) 4.7328 mm ImgH (high temperature (99℃)) 4.7214 mm BFL (room temperature (22℃)) 1.5234 mm Angle of view (FOV) (at room temperature (22℃)) 61.3596 degrees Angle of View (FOV) (Low Temperature (-40℃)) 61.7190 degrees Angle of View (FOV) (High Temperature (99℃)) 60.9228 degrees

formula second embodiment Equation 1 1.7 ≤ nt_1 ≤ 2.3 2.013 Equation 2 nt_2 < nt_1nt_3 < nt_1 satisfied Equation 3 dnt_1/dt ≥ 0
dnt_2/dt < 0
dnt_3/dt < 0
|dnt_2/dt| / |dnt_1/dt| > 20 satisfied Equation 4 1 ≤ |v1 - v2| ≤ 10
1 ≤ |v1 - v3| ≤ 10
50 ≤ v1 + v2 + v3 ≤ 200 satisfied Equation 5 0mm ≤ TTL ≤ 8mm 5.657 Equation 6 Diop_L1 > Diop_L2 > Diop_L3 satisfied Equation 7 1 < Diop_L1 / Diop_L2 < 2 1.821 Equation 8 10 < Diop_L1 / Diop_L3 < 600 542.207 Equation 9 1.8 ≤ F# ≤ 2.2 satisfied Equation 10 1mm ≤ D_1 ≤ 1.7mm 1.430 Equation 10-1 0.2 ≤ D_1/TTL ≤ 0.3 0.253 Equation 11 1 < D_1 / D_2 < 1.6 1.402 Equation 12 2 < D_1 / D_3 < 2.8 2.391 Equation 13 f1 < f2 < f3 satisfied Equation 14 0.4 < f1/f2 < 0.8 0.549 Equation 15 10 < f3 / f1 < 550 542.207 Equation 16 0.5 < L1R1 / L1R2 < 0.8 0.676 Equation 17 2 < L2R1 / L2R2 < 2.3 2.094 Equation 18 1 < L3R1 / L3R1 < 1.3 1.150 Equation 19 0.5 < CA_L1S1 / CA_L3S2 < 0.8 0.701 Equation 19-1 CA_L1S2 ≤ CA_L2S2 ≤ CA_L3S2 CA_L1S2 ≤ CA_L2S1 ≤ CA_L3S1
CA_L1S2 ≤ CA_L2S1 ≤ CA_L2S2 ≤ CA_L3S1 ≤ CA_L3S2 satisfied Equation 20 0.35 < d12 / D_1 < 0.5 0.486 Equation 21 0.7 ≤ CA_Smax / ImgH ≤ 1 0.846 Equation 22 3 ≤ EFL ≤ 5 satisfied Equation 23 FOV > 55 degrees satisfied Equation 24 1 < TTL / ImgH < 1.4 1.204 Equation 25 0.2 < BFL / ImgH < 0.5 0.324 Equation 26 3 < TTL / BFL < 5 3.713 Equation 27 0.6 < EFL / TTL < 0.8 0.695 Equation 28 2 < EFL / BFL < 3 2.580 Equation 29 0.7 < EFL / ImgH < 1 0.837 Equation 30 0.2 < D_1_ET / D_1 < 1.7 0.821 Equation 31 0.3 < D_2_ET / D_2 < 1.7 0.603 Equation 32 0.3 < D_3_ET / D_3 < 1.7 1.248 Equation 33 0.1 < d23 / d23_max < 1 0.471 Equation 34 1 < d23_Sag_L3S1_max / d23 < 5 1.560 Equation 35 0.2 < L_Sag_L3S1 / CA_L3S1 < 1 0.518 Equation 35-1 0.02 < |Sag_L3S1_max| < 0.5 0.0739 Equation 36 0.2 < L_Sag_L3S2 / CA_L3S2 < 1 0.604 Equation 36-1 0.05 < |Sag_L3S2_max| < 0.5 0.1787 Equation 37 0.2 < L3S2_max_sag to Sensor / BFL < 1 0.883 Equation 38 3 < ∑Index < 10 5.278 Equation 39 10 < ∑Abb / ∑Index < 50 12.826 Equation 40 1 < CA_Smax / CA_Smin < 5 2.702 Equation 41 1 < CA_Smax / CA_Aver < 3 1.486 Equation 42 0.1 < CA_Smin / CA_Aver < 1 0.550 Equation 43 0.1 < CA_Smax / ImgH < 1 0.840 Equation 44 0.5 < CA_L1S2 / CA_L2S1 < 1 0.724

Table 25 relates to the items of the above-described equations in the optical system 1000 according to the second embodiment, and the diopter values of the first to third lenses 110 , 120 and 130 at room temperature (about 22° C.) , focal length, total track length (TTL), back focal length (BFL), F value, ImgH, effective focal length (EFL) value for each temperature of the optical system 1000 .

Table 26 shows the result values of Equations 1 to 44 described above in the optical system 1000 according to the second embodiment.

Referring to Table 26, it can be seen that the optical system 1000 according to the second embodiment satisfies at least one of Equations 1 to 44. In detail, it can be seen that the optical system 1000 according to the second embodiment satisfies all of Equations 1 to 44 above.

Accordingly, the optical system 1000 according to the second embodiment has an angle of view of about 60 degrees (60±2 degrees) in a temperature range of a low temperature (-40°C) to a high temperature (99°C), and FIGS. It may have optical characteristics as shown in FIG. 29 .

19 is a graph of relative illumination for each field of the optical system according to the second embodiment, and FIG. 20 is data on distortion characteristics of the optical system according to the second embodiment. In this case, FIGS. 19 and 20 are data obtained by measuring the optical system 1000 at room temperature (about 22° C.).

Referring to FIG. 19 , the optical system 1000 according to the second embodiment may have excellent light intensity ratio characteristics in the 0 field region (center region) to 1.0 field region (edge region) of the image sensor 300 . For example, the optical system 1000 may have an ambient light ratio of about 65% or more. In detail, in the optical system 1000, when the 0 field area is 100%, the light intensity ratio of the 0.5 field area may be about 80% or more, and the light intensity ratio of the 1.0 field area may be about 65% or more. In more detail, the light intensity ratio of the 1.0 field region may be about 70% or more.

Also, referring to FIG. 20 , the optical system 1000 according to the second embodiment may have a barrel distortion shape in which an edge portion of an image is curved outward, and has a distortion of about 0.4630% and about - It may have a TV-distortion of 0.9464%.

21 to 29 are graphs of diffraction MTF characteristics and aberration diagrams of the optical system 1000 according to temperature.

In detail, FIGS. 21 and 22 are graphs of the diffraction MTF characteristics of the optical system 1000 in a low-temperature (-40°C) environment, and FIGS. 24 and 25 are the optical systems in a room-temperature (22°C) environment. (1000) is a graph of the diffraction MTF characteristic, and FIGS. 27 and 28 are graphs of the diffraction MTF characteristic of the optical system 1000 in a high temperature (99° C.) environment.

23, 26 and 29 are graphs of aberration diagrams of the optical system 1000 in low-temperature (-40°C), room-temperature (22°C), and high-temperature (99°C) environments, respectively, from left to right This is a graph measuring Longitudinal Spherical Aberration, Astigmatic Field Curves, and Distortion. 23, 26, and 29, the X-axis may represent a focal length (mm) or distortion (%), and the Y-axis may mean the height of an image. In addition, the graph for spherical aberration is a graph for light in a wavelength band of about 920 nm, about 940 nm, and about 960 nm, and a graph for astigmatism and distortion aberration is a graph for light in a wavelength band of 940 nm.

In the aberration diagrams of FIGS. 23, 26 and 29, the closer the curves are to the Y-axis, the better the aberration correction function can be interpreted. Referring to FIGS. 23, 26 and 29, according to the first embodiment In the optical system 1000, it can be seen that measured values are adjacent to the Y-axis in almost all areas.

21 to 29 , in the optical system 1000 according to the second embodiment, there is little or no change in MTF characteristics and aberration characteristics even when the temperature is changed in the range of low temperature (-40°C) to high temperature (99°C). You can see it's not that big. In detail, it can be seen that the MTF characteristic change at low temperature (-40°C) and high temperature (99°C) is less than 10% of room temperature (22°C).

That is, the optical system 1000 according to the second embodiment may maintain excellent optical properties in various temperature ranges. In detail, in the optical system 1000 , the first lens 110 is made of a material different from that of the second lens 120 and the third lens 130 , for example, the first lens 110 is made of glass, and the second lens is made of glass. 120 and the third lens 130 may include a plastic material. Accordingly, when the temperature increases, the refractive index of the first lens 110 may increase, and the refractive index of the second lens 120 and the third lens 130 may decrease.

At this time, the first to third lenses 110 , 120 , and 130 according to the second embodiment are provided with a set refractive index, shape, thickness, etc. can be compensated Accordingly, the optical system 1000 may prevent or minimize changes in optical properties in a temperature range of low (-40°C) to high (99°C), and maintain improved optical properties.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

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

Optics: 1000
First lens: 110 Second lens: 120
Third lens: 130 Image sensor: 300
Cover glass: 400 Filter: 500

Claims (17)

It includes first to third lenses and an image sensor disposed along the optical axis from the object side to the sensor side direction,
The refractive power of the first lens is positive,
The refractive power of the second lens is positive,
The object-side surface and the sensor-side surface of the first lens are spherical,
The first lens has a convex shape toward the object,
The refractive index (nt_1) of the first lens is 1.8 ≤ nt_1 ≤ 2.3,
The thickness (D_1) of the first lens in the optical axis satisfies 0.2 ≤ D_1/TTL ≤ 0.3,
TTL is 7mm or less
At least one of the second lens and the third lens is made of a plastic material.
(TTL is the distance in the optical axis from the object side surface of the first lens to the image sensor image surface.) The method of claim 1,
The first lens is made of glass,
The second lens and the third lens are made of a plastic material. 3. The method of claim 1 or 2,
ImgH is the diagonal length of the image sensor,
wherein the TTL and the ImgH satisfy 1 < TTL / ImgH < 1.4. 4. The method of claim 3,
An optical system in which a thickness D_1 of the first lens in the optical axis and a thickness D_2 of the second lens in the optical axis satisfy 1 < D_1 / D_2 < 1.6. 4. The method of claim 3,
BFL is the distance in the optical axis from the apex of the sensor side surface of the third lens to the upper surface of the image sensor,
and the BFL and the ImgH satisfy 0.2 < BFL / ImgH < 0.5. 4. The method of claim 3,
The focal length f1 of the first lens, the focal length f2 of the second lens, and the focal length f3 of the third lens satisfy f1 < f2 < f3. It includes first to third lenses and an image sensor disposed along the optical axis from the object side to the sensor side direction,
The refractive power of the first lens is positive,
The refractive power of the second lens is positive,
The first lens has a convex shape toward the object,
At least one lens of the second lens and the third lens is made of a plastic material,
The thickness (D_1) of the first lens in the optical axis satisfies 0.20 ≤ D_1/TTL ≤ 0.3,
TTL is 7mm or less,
When changing 50-70 degrees compared to room temperature, the rate of change of the effective focal length is 0 ~ 10%, and the rate of change of the angle of view is 0 ~ 10%.
(TTL is the distance on the optical axis from the object side surface of the first lens to the image sensor image sensor, and the room temperature is 20 to 30 degrees.) 8. The method of claim 7,
The first lens is made of glass,
The second lens and the third lens are made of a plastic material. 9. The method of claim 8,
The sag value of the object-side surface of the third lens includes an increasing section and a decreasing section,
The sag value of the object-side surface of the third lens satisfies 1.5 < d23_Sag_L3S1_max / d23 < 3.
(d23_Sag_L3S1_max is the optical axis direction distance from the maximum Sag value position of the object side surface of the third lens to the sensor side surface of the second lens facing in the optical axis direction, d23 is the distance between the second lens and the third lens It is the distance from the optical axis.) 10. The method according to claim 8 or 9,
The effective diameter length (CA_L1S1) of the object-side surface of the first lens and the effective diameter length (CA_L3S2) of the sensor-side surface of the third lens satisfy 0.5 < CA_L1S1 / CA_L3S2 < 0.8. 11. The method of claim 10,
The effective diameter length (CA_L1S2) of the sensor side surface of the first lens and the effective diameter length (CA_L2S1) of the object side surface of the second lens satisfy 0.5 < CA_L1S2 / CA_L2S1 < 1. 11. The method of claim 10,
CA_Smax is the effective diameter length of the lens having the largest effective diameter among the first to third lenses,
ImgH is the diagonal length of the image sensor,
An optical system in which the CA_Smax and the ImgH satisfy 0.7 ≤ CA_Smax / ImgH ≤ 1. It includes first to third lenses disposed along the optical axis from the object side to the sensor side direction,
The refractive power of the first lens is positive,
The refractive power of the second lens is positive,
The refractive index (nt_1) of the first lens is 1.8 ≤ nt_1 < 2.3,
At least one lens of the second lens and the third lens is made of a plastic material,
The distance (TTL) in the optical axis from the object-side surface of the first lens to the image sensor image sensor is 7 mm or less,
The sag value of the object-side surface of the third lens includes an increasing section and a decreasing section,
The sag value of the object-side surface of the third lens is 1.5 < d23_Sag_L3S1_max / d23 < 3 optical system.
(d23 is the distance on the optical axis between the second lens and the third lens, and d23_Sag_L3S1_max is from the position of the maximum Sag value on the object side surface of the third lens to the sensor side surface of the second lens facing in the optical axis direction. It is the distance in the direction of the optical axis.) 14. The method of claim 13,
The first lens is made of glass,
The second lens and the third lens are made of a plastic material. 15. The method of claim 13 or 14,
The sag value of the third lens object side surface is 0.05 < |Sag_L3S1_max| An optical system satisfying < 0.1.
(Sag_L3S1_max is the difference (mm) between the Sag value on the optical axis of the object-side surface of the third lens and the maximum Sag value on the object-side surface of the third lens.) 15. The method according to claim 13 or 14,
The sag value of the third lens object side surface satisfies 0.4 < L_Sag_L3S1 / CA_L3S1 < 0.8.
(L_Sag_L3S1 is the distance in the direction perpendicular to the optical axis from the optical axis to the maximum Sag value of the object-side surface of the third lens, and CA_L3S1 is the length from the optical axis to the effective diameter of the object-side surface of the third lens.) 15. The method of claim 13 or 14,
The sag value of the third lens sensor side includes an increasing section and a decreasing section,
The sag value of the third lens sensor side is 0.05 < |Sag_L3S2_max| An optical system satisfying < 0.5.
(Sag_L3S2_max is the difference (mm) between the Sag value at the optical axis of the sensor side of the third lens and the maximum Sag value at the sensor side of the third lens.)

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