Camera module and driving assistance device

Abstract

A camera module provided by an embodiment of the present invention may include: a head having a side wall portion, an accommodation space in the side wall portion, and a plurality of ribs; a lens barrel having an opening communicating with the accommodation space of the head and a lens holder vertically extending through the opening; a lens portion having a plurality of lenses in the lens holder; and an image sensor for converting light incident from the plurality of lenses into an electric signal, in which the plurality of ribs are spaced apart from each other on an upper peripheral edge of the opening, each of the plurality of ribs has a first inclined surface on the upper peripheral edge of the opening, the opening has a second inclined surface on a peripheral edge thereof, a first angle, which is an interior angle between the first inclined surface and the horizontal straight line, is R1, a second angle, which is an interior angle between the second inclined surface and the horizontal straight line, is R2, and a viewing angle of the image sensor in a diagonal direction is FOV, which satisfies formula 1: R1 < = 90 DEG-(1 / 2 * FOV).

Description

Technical Field

[0001] Embodiments of the present invention relate to a camera module and a driving assistance device. Background Art

[0002] If a driver's attention is distracted while driving due to fatigue or negligence, accidents are inevitable. Accidents can occur due to fatigue, smoking, or not paying attention to the road ahead. Because the consequences of negligence are too severe to rely solely on individual drivers, various driver assistance devices are being developed. There are various methods for identifying fatigued or inattentive driving. The main method uses a camera to capture the driver and analyze the image, while Advanced Driver Assistance Systems (ADAS) are also used to receive lane departure information and identify inattentive driving.

[0003] An advanced driver assistance system (ADAS) is an advanced driver assistance system used to assist the driver in driving. The advanced driver assistance system includes sensing the situation ahead, judging the situation based on the sensing results, and controlling the behavior of the vehicle based on the judgment of the situation. For example, ADAS detects the vehicle ahead and identifies the lane. Afterwards, when the target lane, target speed, and target ahead are determined, the vehicle's electronic stability control system (ESC: Electrical Stability Control), engine management system (EMS: Engine Management System), motor-driven power steering system (MDPS: MotorDriven Power Steering), etc. are controlled. Representative examples of ADAS include automatic parking systems, low-speed city driving assistance systems, and blind spot warning systems. The sensor devices used to sense the situation ahead in ADAS include GPS sensors, laser scanners, front radars, and lidars, and the most representative one is a front camera for photographing the front of the vehicle.

[0004] Recently, for the safety and convenience of the driver, research on detection systems that detect the driver or the vehicle's surrounding environment has been accelerated. The vehicle detection system monitors the driver's condition or state, detects objects around the vehicle, supports collisions with objects that the driver is not aware of, and also performs automatic parking. It is used for various purposes and provides the most necessary data for automatic vehicle control. The vehicle-mounted camera module is used by the front, interior, and rear surveillance cameras and driving recorders (black boxes) built into the vehicle, and takes pictures or videos of surrounding objects or the driver. The shooting quality of such a vehicle-mounted camera module may be reduced due to moisture and temperature, and such a vehicle-mounted camera module has a problem that the optical characteristics vary depending on the ambient temperature and the material of the lens. Summary of the Invention

[0005] Technical issues

[0006] Embodiments of the present invention may provide a camera module for driving assistance. Embodiments of the present invention may provide a camera module that can mitigate temperature-induced changes in shape and optical properties. Embodiments of the present invention may provide a camera module that can mitigate temperature-induced changes in optical properties in the areas between the lens barrel and the optical lens, between the optical lens and the spacing member, and between the optical lens and the partition member. Embodiments of the present invention may provide a mobile terminal having a camera module and a driving assistance device for a mobile device such as a vehicle.

[0007] Technical Solution

[0008] A camera module according to an embodiment of the present invention may include: a head portion having a side wall portion and a receiving space and a plurality of ribs within the side wall portion; a lens barrel having an opening communicating with the receiving space of the head portion and having a lens holder perpendicularly passing through the opening; a lens portion having a plurality of lenses located within the lens holder; and an image sensor configured to convert light incident through the plurality of lenses into an electrical signal, wherein each of the plurality of ribs is spaced apart from each other on an upper peripheral edge of the opening, wherein each of the plurality of ribs has a first inclined surface on an upper peripheral edge of the opening, wherein the opening has a second inclined surface on the peripheral edge, wherein a first angle as an inner angle between the first inclined surface and a horizontal straight line is denoted as R1, a second angle as an inner angle between the second inclined surface and the horizontal straight line is denoted as R2, and a diagonal field of view of the image sensor is denoted as FOV, wherein Mathematical Formula 1 is satisfied: 90°-(3 / 4*FOV)≤R1≤90°-(1 / 2*FOV).

[0009] According to an embodiment of the present invention, Mathematical Formula 2 may be satisfied: 90°-(3 / 4*FOV)≤R2≤90°-(1 / 2*FOV). The second angle may be equal to or greater than the first angle. Mathematical Formula 3 may be satisfied: 40 degrees≤FOV≤50 degrees.

[0010] According to an embodiment of the present invention, the first lens closest to the object among the multiple lenses can have a convex shape on the optical axis on the object side surface, the upper end of the first inclined surface can be set above the horizontal straight line passing through the center of the object side surface of the first lens, and the lower end of the first inclined surface can be set below the horizontal straight line passing through the center of the object side surface of the first lens.

[0011] According to an embodiment of the present invention, the height of the head can be expressed as D1, and the height of the lens holder, which is the height from the lower surface of the head to the lower end of the lens holder, can be expressed as D2. The conditional expression 1 can be satisfied: 1 < D2 / D1 < 3. Half of the maximum diameter of the head is expressed as D4, and half of the maximum diameter of the lens holder is expressed as D5. The conditional expression 2 can be satisfied: 1 < D4 / D5 < 3. According to an embodiment of the present invention, the conditional expression 3 can be satisfied: 1 < (D4 * 2) / (D1 + D2) < 2. The maximum diameter of the head can be expressed as B1, and the diameter of the opening can be expressed as B0. The conditional expression 4 can be satisfied: 0.1 < B0 / B1 < 0.6.

[0012] According to an embodiment of the present invention, a plurality of ribs can be arranged radially around the upper peripheral edge of the opening, and the inner lower end of each of the plurality of ribs can be spaced apart from the upper end of the opening.

[0013] The camera module according to an embodiment of the present invention can include: a head having a side wall portion, a receiving space located within the side wall portion, and a plurality of ribs; a lens barrel having an opening communicating with the receiving space of the head and having a lens holder vertically passing through the opening; a plurality of lenses aligned along the optical axis within the lens holder; a light shielding film provided on the outer peripheral edge between adjacent two lenses; a spacer member provided on the outer peripheral edge to space apart adjacent plastic lenses among the plurality of lenses; an optical filter provided below the lens holder and on the sensor side of the last lens; a support member provided on the outer lower surface of the last lens and the peripheral edge of the optical filter; and an image sensor configured to convert light incident through the plurality of lenses into an electrical signal. Among them, each of the plurality of ribs can be spaced apart from each other on the upper peripheral edge of the opening. Among them, each of the plurality of ribs can have a first inclined surface on the upper peripheral edge of the opening. The opening can have a second inclined surface on the peripheral edge. The first angle, which is the internal angle between the first inclined surface and the horizontal straight line, can be expressed as R1. The second angle, which is the internal angle between the second inclined surface and the horizontal straight line, can be expressed as R2. The diagonal field of view of the image sensor can be expressed as FOV. Among them, the mathematical expressions 1: 90° - (3 / 4 * FOV) ≤ R1 ≤ 90° - (1 / 2 * FOV) and mathematical expression 2: 90° - (3 / 4 * FOV) ≤ R2 ≤ 90° - (1 / 2 * FOV) can be satisfied.

[0014] According to an embodiment of the present invention, the height of the head can be represented as D1, the height of the lens holder, which is the height from the lower surface of the head to the lower end of the lens holder, can be represented as D2, the distance from the center of the object side surface of the first lens closest to the object among the multiple lenses to the optical axis of the image sensor can be represented as TTL, and the number of the multiple lenses can be nL. Among them, the conditional expression 1 can be satisfied: 4 < (nL * D1 * D2) / TTL < 8, where nL can be 3 to 5. Half of the maximum diameter of the head can be represented as D4, and the conditional expression 2 can be satisfied: D4 ≤ TTL.

[0015] According to an embodiment of the present invention, the inner side of the spacer member can have a third inclined surface. The outer angle of the third inclined surface with respect to the horizontal straight line can be represented as R4, and the inner angle of the straight line passing through the ends of the effective areas of the sensor side surface of the lens provided on the object side of the spacer member and the object side surface of the lens provided on the sensor side can be represented as R3. The conditional expression 3 can be satisfied: FOV < R3, and the conditional expression 4: R4 ≤ FOV. According to an embodiment of the present invention, the condition 5 can be satisfied: 54 degrees < R3 < 90 degrees.

[0016] According to an embodiment of the present invention, the object side surface of the first lens closest to the object among the multiple lenses can have a convex shape on the optical axis. The upper end of the first inclined surface can be provided above the horizontal straight line passing through the center of the object side surface of the first lens, and the lower end of the first inclined surface can be provided below the horizontal straight line passing through the center of the object side surface of the first lens.

[0017] According to an embodiment of the present invention, the height of the head is represented as D1, the height of the lens holder, which is the height from the lower surface of the head to the lower end of the lens holder, is represented as D2, and half of the maximum diameter of the lens holder is represented as D5. The conditional expression 6 can be satisfied: 1 < D2 / D1 < 3, and the conditional expression 7: 1 < D4 / D5 < 3. According to an embodiment of the present invention, the maximum diameter of the head is represented as B1, and the diameter of the opening is represented as B0. The conditional expression 8 can be satisfied: 1 < (D4 * 2) / (D1 + D2) < 2, and the conditional expression 9: 0.1 < B0 / B1 < 0.6.

[0018] In another embodiment of the present invention, the above - disclosed driving assistance device can include an infrared camera module.

[0019] Beneficial effects

[0020] According to an embodiment of the present invention, a camera module is provided, which includes at least one of a lens and / or a lens barrel capable of mitigating changes in optical characteristics caused by temperature changes, thereby improving the reliability of the camera module. According to an embodiment of the present invention, a camera module is provided, which includes at least one of a lens and / or a lens barrel capable of mitigating physical changes caused by temperature changes, thereby improving the reliability of the camera module.

[0021] According to embodiments of the present invention, by controlling the contact position and / or contact area of plastic lenses, thermal deformation can be suppressed, thereby improving the reliability of the camera module. According to embodiments of the present invention, spacers and / or spacing members can be used to control the distance between lenses in the camera module, thereby controlling the optical path and light intensity. According to embodiments of the present invention, the optical reliability of the camera module can be improved, and the reliability of the vehicle-mounted camera device including the camera module can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a plan view of a camera module according to an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Example of an AA side cross-sectional view of a camera module.

[0024] Figure 3 yes Figure 1 Example of a BB side cutaway view of a camera module.

[0025] Figure 4 is with Figure 2 An example of a housing combined with the periphery of the lens barrel.

[0026] Figure 5 It shows Figure 2 A partial view of the camera module's barrel and lens combination and the optical path.

[0027] Figure 6 It shows Figure 2 A magnified view of the partition member and peripheral lens in the camera module.

[0028] Figure 7 It shows Figure 2 A magnified view of the support structure and surrounding lenses in the camera module.

[0029] Figure 8 is a graph comparing modulation transfer function (MTF) characteristics of camera modules according to a comparative example and an embodiment of the present invention.

[0030] Figure 9 is an example of a vehicle having a camera module according to an embodiment of the present invention.

[0031] Figure 10 It shows Figure 9 A diagram of the driving assistance devices inside the vehicle. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The technical idea of the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more components between the embodiments can be selectively combined or replaced. In addition, the terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as meanings that can be generally understood by ordinary technicians in the technical field to which the present invention belongs, unless clearly and specifically defined and described, and commonly used terms (such as terms defined in dictionaries) can be interpreted in consideration of the contextual meaning of the relevant technology.

[0033] In addition, the terms used in the embodiments of the present invention are used to describe the embodiments and are not intended to limit the present invention. In this specification, unless specifically stated in the wording, the singular form may also include the plural form, and when described as "at least one (or more than one) of A and (and) B, C", it may include more than one of all combinations that can be combined with A, B, C. In addition, when describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are only intended to distinguish the components from other components, and the properties, order or sequence of the components are not determined by these terms. In addition, when a component is described as being "connected", "combined" or "connected" to another component, the component may include not only the situation where it is directly connected, combined or connected to another component, but also the situation where it is "connected", "combined" or "connected" by another component located between the component and the other component. In addition, when described as being formed or arranged "above or below" each component, above or below not only includes the situation where the two components are in direct contact with each other, but also includes the situation where one or more other components are formed or arranged between the two components. In addition, when the expression "above" or "below" is used, it can include not only the meaning of the upward direction based on a component, but also the meaning of the downward direction based on the component. In addition, unless otherwise explicitly stated, the multiple embodiments described below can be combined with each other. In addition, unless otherwise explicitly stated, any part omitted in the description of one embodiment among the multiple embodiments can be applied to the description of other embodiments.

[0034] In the description of this invention, the first lens refers to the lens closest to the object side, and the last lens refers to the lens closest to the image side (or sensor surface). The last lens may include the lens adjacent to the image sensor. Unless otherwise specified, the units of lens radius, thickness / distance, TTL, etc. are all in mm. In this specification, the shape of a lens is expressed based on the lens' optical axis. For example, "the object side of a lens is convex or concave" means that it is convex or concave near the optical axis on the object side of the lens, but not that the area surrounding the optical axis is convex or concave. Therefore, even if the object side of a lens is described as convex, the area surrounding the optical axis on the object side of the lens may be concave, or may have the opposite shape. It should be noted that the thickness and radius of curvature of a lens in this specification are measured based on the lens' optical axis. That is, the convex surface of a lens may refer to the lens surface having a convex shape in the area corresponding to the optical axis, and the concave surface of a lens may refer to the lens surface having a concave shape in the area corresponding to the optical axis. In addition, the "object-side surface" may refer to the surface of the lens facing the object side relative to the optical axis, and the "sensor-side surface" may refer to the lens surface facing the sensor side relative to the optical axis.

[0035] Figure 1 is a plan view of a camera module according to an embodiment of the present invention, Figure 2 yes Figure 1 Example of an AA side cross-sectional view of a camera module, Figure 3 yes Figure 1 Example of a BB side cross-sectional view of a camera module, Figure 4 is with Figure 2 An example of a housing combined with the periphery of the lens barrel, Figure 5 It shows Figure 2 The combination of the lens barrel and lens in the camera module and a partial view of the optical path, Figure 6 It is an explanation Figure 2 A magnified view of the spacer components and peripheral lenses in the camera module. Figure 7 It is an explanation Figure 2 A magnified view of the support structure and surrounding lenses in the camera module.

[0036] Reference Figures 1 to 3 A camera module 1000 according to an embodiment of the present invention may include: a lens barrel 500; a lens unit 100 having a plurality of lenses; members 121, 123, and 124 for maintaining a gap between adjacent lenses; and a supporting member 125. At least one of the members 121, 123, and 124 for maintaining a gap may be a spacer member or a light shielding portion, and the remaining members may be spacer members.

[0037] The camera module 1000 may include a main substrate 190 and an image sensor 192 arranged on the sensor side of the lens unit 100. The camera module 1000 may include an optical cover glass 194 and an optical filter 196 located between the last lens of the lens unit 100 and the image sensor 192. The lens unit 100 may be defined as an optical system. The lens unit 100 may be incorporated into the lens barrel 500. The lens unit 100 may be an optical system in which three or more or five or less lenses are stacked. The lens unit 100 may include three or more or less solid lenses.

[0038] The lens portion 100 may include at least one plastic lens, or at least one glass lens, and a plastic lens. In the lens portion 100 according to an embodiment of the present invention, the number of plastic lenses may be greater than or equal to two, or more than the number of glass lenses. Here, the lens portion 100 may be stacked with plastic lenses and / or glass lenses. Here, the coefficient of thermal expansion (CTE) of the plastic material may be at least 5 times higher than the coefficient of thermal expansion (CTE) of the glass material, and the change value of the refractive index as a function of temperature may be at least 10 times higher for the plastic material than for the glass material.

[0039] The lens unit 100 can align a first lens 111, a second lens 113, and a third lens 115 along the optical axis (OA) on the object side toward the image sensor 192. The second lens 113 can be positioned between the first lens 111 and the third lens 115. The third lens 115 can be positioned between the second lens 113 and the optical filter 196. As another example, a front lens can be further positioned on the object side of the first lens 111, or another lens can be further positioned between the first lens 111 and the second lens 113, or between the second lens 113 and the third lens 115. The lenses 111, 113, and 115 of the lens unit 100 are coupled to the opening 101 in the lens barrel 500, and can be coupled, for example, from the sensor side toward the object side. Therefore, the opening area of the opening 101 on the object side of the first lens 111, which is closest to the object, can be smaller than the opening area 102 on the sensor side of the last lens. As another example, the lenses 111, 113, and 115 may be coupled from the object side of the lens unit 100 toward the sensor, or may be coupled with the object side in the sensor direction. Hereinafter, the lens 111, 113, and 115 in the opening 101 of the lens barrel 500 may be coupled from the sensor side toward the object as an example.

[0040] like Figure 2 and Figure 3As shown, the opening 101 of the lens barrel 500 can penetrate from the top to the bottom. The opening 101 can have a minimum diameter (B0) at the periphery of the object-side surface (S1) of the first lens 101 closest to the object. The opening 101 is a bottomless area and can have a maximum diameter at the lower opening area 102. The lens barrel 500 may include a head 550 and a lens holder 510. The head 550 and the lens holder 510 may be formed integrally.

[0041] The head 550 may have a receiving space 551 therein, and the center of the receiving space 551 may be in communication with the opening 101 of the lens holder 510. The inner diameter of the receiving space 551 may be greater than twice the minimum diameter (B0) of the opening 101, for example, greater than twice and less than four times. The inner diameter of the receiving space 551 may be greater than 1 times and less than twice the diameter of the lower portion of the opening 101. Since the inner diameter of the receiving space 551 is set within the above range, it can be easily connected to the outer frame connected to the lens barrel 500, that is, the upper shell.

[0042] The outer diameter or maximum diameter (B1) of the head portion 550 may be larger than the lower outer diameter or maximum diameter of the lens holder 510. The lower inner diameter of the lens holder 510 may be larger than the upper inner diameter located around the first lens 111. The accommodation space 551 of the head portion 550 is open to the object side area or the upper area and may have an inner diameter larger than the lower outer diameter of the lens holder 510. The accommodation space 551 may have a recessed center to communicate with the opening 101 of the lens holder 510. The lens holder 510 may extend from the center of the head portion 550 toward the sensor side.

[0043] The accommodation space 551 of the head 550 includes a plurality of ribs 555, and the ribs 555 can extend from the optical axis toward the outer circumference. Adjacent ribs 555 can be spaced apart from each other at the same angle with respect to the optical axis (OA), for example, the angle is in the range of 40 to 180 degrees or in the range of 50 to 120 degrees, and preferably in the range of 50 to 75 degrees. The plurality of ribs 555 are spaced apart from each other in the accommodation space 551 and can be arranged in the range of 2 to 8 or in the range of 5 to 7 in the circumferential direction. The plurality of ribs 555 can be arranged in a radial shape around the opening 101. Therefore, the rigidity of the head 550 can be prevented from being reduced by the plurality of ribs 555.

[0044] The head portion 550 can be coupled to another conveying device. The head portion 550 has a bottom portion 553 and a sidewall portion 554. The bottom portion 553 may include a bottom portion S12 of the receiving space 551 and an opposing lower surface S15. The sidewall portion 554 may include a side surface S11 of the receiving space 551 and an opposing outer surface. The sidewall portion 554 may be bent vertically from the end of the bottom portion 553 or in the direction of the optical axis.

[0045] As Figure 2 and Figure 3 shown, the height (D1) of the head 550 is the outer surface height of the side wall portion 554, and can be less than the height (D2) of the lens holder 510. The sum of the height (D1) of the head 550 and the height (D2) of the lens holder 510 can be the height or thickness of the lens barrel 500. The height (D1) of the head 550 and the height (D2) of the lens holder 510 can satisfy the following conditional formula 1.

[0046] Conditional formula 1: 1 < D2 / D1 < 3

[0047] In conditional formula 1, the head 550 can be set within a range convenient for the transport device to pick up the camera module 1000 by protruding to the height (D1). Preferably, 2 mm ≤ D1 ≤ 3 mm can be satisfied.

[0048] Conditional formula 2: 1 < D3 / D2 < 2

[0049] In conditional formula 2, D3 is the optical axis distance from the center of the object side surface S1 of the first lens 111 to the bottom of the lens holder 510. When the camera module 1000 satisfies conditional formula 2, the reduction of the amount of light incident on the object side surface (S1) of the first lens 111 can be prevented, and the total length of the optical system, that is, the total top length (TTL, Total Top Length) can be set. The values of D2 and D3 can vary according to the optical design, and D2 < D3 < TTL can be satisfied. Here, TTL is the optical axis distance from the center of the object side surface S1 of the first lens 111 to the surface of the image sensor 192. Preferably, D2 is within the range of 3 mm < D2 < 6.5 mm, and D2 can be within the range of 3 mm < D2 < 6.5 mm. Here, the height D2 of the head 550 is the height for the active alignment process of the camera module 1000, can be adjusted to compensate for the optical change of BFL through thermal compensation design, and can be determined according to, for example, the coefficient of thermal expansion (CTE) of the lens material, the effective diameter of the lens, and the amount of compensation for the magnitude of the temperature change of the lens. As another example, a camera module including an optical system with a small TTL or an optical system considering thermal compensation can satisfy D3 < D2 < TTL.

[0050] Conditional formula 3: 1 < D4 / D5 < 3

[0051] In Conditional Expression 3, D4 is the distance from the optical axis (OA) in a direction perpendicular to the optical axis (OA) to the outer surface of the head 550, and this distance is half of the diameter (B1) of the head 550. D5 is half of the lower outer diameter of the lens holder 510 or the lower radius of the lens holder 510. When the lens barrel 500 satisfies Conditional Expression 3, the operation of the conveying device can be facilitated, the area for bonding the adhesive 650 to the lower surface (S15) of the bottom 553 can be ensured, and the assembly problem of the camera module can be improved. Preferably, 1 < D4 / D5 < 2 can be satisfied.

[0052] Conditional Expression 3-1: 1 < (D4 * 2) / (D1 + D2) < 3

[0053] Conditional Expression 3-1 arranges the diameter (D4 * 2) of the head 550 to be greater than the height (D1 + D2) of the lens barrel 500, thereby providing a lens barrel 500 with a thin height. Preferably, 1 < (D4 * 2) / (D1 + D2) < 2 can be satisfied.

[0054] Conditional Expression 3-2: 1.5 < D4 / D1 < 4

[0055] Conditional Expression 3-2 arranges the radius (D4) of the head 550 to be greater than the height (D1) of the head 550, thereby facilitating the operation of the conveying device through the head 550. Preferably, 1 < (D4 * 2) / (D1 + D2) < 2 can be satisfied.

[0056] Conditional Expression 4: 1 < D5 / D6 < 3

[0057] In Conditional Expression 4, D6 is the horizontal distance between the straight line perpendicular to the outer surface of the head 550 and the outer surface of the lens holder 510, and can be the protruding length of the head 550 based on the lower part of the lens barrel 500. This Conditional Expression 4 can ensure the area for bonding the adhesive 650 through the lower surface S15 of the bottom 553 by limiting the minimum protruding length of the head 550 in the lens barrel 500 to the above range. Preferably, 1.5 < D5 / D6 < 2.5 can be satisfied, and 1.5 mm ≤ D6 ≤ 3 mm can be satisfied. In addition, D6 < D5 < D4 can be satisfied.

[0058] Conditional Expression 5: D6 ≤ D7

[0059] In conditional expression 5, D7 is the distance from the upper outer surface of the lens holder 510 to the outer surface of the head 550, and is the maximum depth from the outer surface of the head 550 to the upper outer surface of the lens holder 510. Here, when the depths (D7, D6) of the upper outer surface and the lower outer surface of the lens holder 510 are the same, the upper outer surface and the lower outer surface of the lens holder 510 can be injection-molded into vertical surfaces, which can facilitate processing. In addition, when D6 < D7, in the case of the injection-molded shape of the lens barrel 500, the lens barrel can be applied to a conical optical system to obtain dimensional stability and uniformity of the lens barrel thickness. In addition, when injecting the lens barrel, a shape in which the mold can be separated from the top / bottom / left / right is required, so that D6 ≤ D7 or D6 < D7 can be satisfied.

[0060] Conditional expression 6: 0.1 < B0 / B1 < 0.6

[0061] In conditional expression 6, the upper diameter B1 of the opening 101 is designed to be less than 0.6 times the diameter B1 of the head 550, so that the diameter of the opening 101 inside the head 550 can be set.

[0062] The ribs 555 can be connected to the bottom 553 and the side wall portion 554. Each of the plurality of ribs 555 projects from the bottom 553 of the accommodation space 551 in the optical axis direction and can have the same height. The thickness of the ribs 555 can be the width in the circumferential direction and can be the same for each other. The length of the ribs 555 extending outward from the optical axis can vary according to the region. For example, the upper length of each rib 555 can be shorter than the lower length. The lower length is the lower length of each rib 555 extending from the side surface S11 of the side wall portion 555 toward the optical axis. The upper length is the upper surface length of each rib 555 extending from the side surface S11 of the side wall portion 555 toward the optical axis. Here, the accommodation space 551 can be set as a combined space of a space transfer device capable of effectively receiving incident light, and the straight-line distance from the upper end of the opening 101 to the side surface S11 of the side wall portion 555 is a part of the width B4 of the bottom S12. Here, the lower length B2 of each rib 555 can be arranged to be less than a part of the width B4 of the bottom S12. That is, the inner lower end of each rib 555 can be spaced apart from the upper end of the opening 101. Therefore, interference with the incident light around the upper end of the opening 101 can be prevented, or light loss around the upper end of the opening 101 can be reduced.

[0063] The upper end of the opening 101 can include a stepped portion S22a starting from the bottom S12 of the accommodation space 551, and the stepped portion S22a can be set as an annular shape. This stepped portion S22a can prevent the problem of burrs due to injection molding.

[0064] Each rib 555 may include an upper surface S20, a first inclined surface S21, and a recessed portion S22. The upper surface S20 of each rib 555 may extend in the same plane as the upper surface S10 of the head portion 550 or the upper surface of the sidewall portion 553. The first inclined surface S21 may be inclined from the upper surface S20 toward the opening 101. At least one or both of the upper surface S20 and the second inclined surface S21 may have an edge portion, which is a boundary portion between both sides of each rib 555 and is processed into a curved surface to prevent defects caused by injection molding.

[0065] The interior angle between a straight line extending along the first inclined surface S21 and a straight line perpendicular to the optical axis OA (horizontal straight line) may be a first angle R1. The first angle R1 may be greater than 50 degrees, for example, within a range of 50 to 65 degrees. Preferably, the first angle R1 may be within a range of 55 to 60 degrees. The first angle R1 of the first inclined surface S21 may be an angle that interferes with the effective field of view (FOV) or entrance pupil of the opening 101. If the first angle R1 is less than this range, the rigidity may be reduced or the image may be difficult to pick up. If the first angle R1 is greater than this range, the effective field of view may be interfered with.

[0066] The inner surface of the opening 101 may have a second inclined surface S13. The inner angle between the second inclined surface S13 and the horizontal line is a second angle R2, that is, the second angle R2 may be inclined from the bottom of the accommodating space 551 to the bottom of the second inclined surface S13. The second angle R2 may be less than 65 degrees, for example, in the range of 50 to 65 degrees. Preferably, the second angle R2 may be in the range of 55 to 60 degrees. The second angle R2 may be an angle for preventing interference with the effective field of view (FOV) or the entrance pupil of the opening 101. If it is less than this range, unnecessary light may be introduced. If it is greater than this range, there is a problem of affecting the effective field of view.

[0067] The second angle R2 of the second inclined surface S13 is the angle between a straight line passing through the upper end F2 and the lower end F1 of the second inclined surface S13 and a horizontal straight line, and may extend to the periphery of the effective area of the first surface S1 on the object side of the first lens 111. The upper end F2 of the second inclined surface S13 may be located above a straight line perpendicular to the center of the first surface S1 on the object side of the first lens 111. The lower end F1 of the first inclined surface S13 may be located below a straight line perpendicular to the center of the first surface S1 on the object side of the first lens 111. The second inclined surface S13 may be arranged around the periphery of the effective area of the first surface S1 on the object side of the first lens 111 and may function as an upper aperture.

[0068] The upper inner surface S14 of the lens holder 510 adjacent to the second inclined surface S13 extends outward from the lower end F1 of the second inclined surface S13 and may face the outer surface S1a between the first surface S1 on the object side of the first lens 111 and the first flange portion 111A of the first lens 111. For the insertion of the upper part of the first lens 111, i.e., the protruding part, the upper inner surface S14 of the lens holder 510 may be arranged to incline outward. That is, the upper inner surface S14 of the lens holder 510 may have a diameter that gradually widens from the object towards the sensor, and the minimum diameter may be greater than the upper diameter B0 of the opening 101. The upper diameter C11 of the first lens 111 may be arranged to be greater than the upper diameter B0 of the opening 101, and when C11 < B0, the light traveling to the outer surface S1a of the first surface S1 of the first lens 111 may be reflected by the lens and focused on the image sensor 192, which may cause ghosting or flare.

[0069] The first angle R1 and the second angle R2 may be the same, and as another example, the difference between the first angle R1 and the second angle R2 may be 5 degrees or less or 3 degrees or less. In addition, the conditional expression R1 ≤ R2 may be satisfied. That is, the second angle R2 of the second inclined surface S13 adjacent to the first lens 111 may be equal to or greater than the first angle R1 of the first inclined surface S21 provided on the object side with respect to the opening 101. Therefore, the first inclined surface S21 and the second inclined surface S13 may reduce the interference with the light traveling towards the opening 101 and do not affect the viewing angle of the effective optical system.

[0070] The concave portion S22 may have a shape that is more recessed than the straight line extending along the first inclined surface S21. The inclination angle R1a of the surface of the concave portion S22 may be 65 degrees or more, for example, within the range of 65 degrees to 85 degrees or within the range of 70 degrees to 85 degrees. The inclination angle R1a of the surface of the concave portion S22 may be greater than the first angle R1 and the second angle R2. The lower end of the concave portion S22 may be connected to the bottom S12 of the accommodation space 551 and may be spaced apart from the upper end F2 of the opening 101. Therefore, when the rib 555 is injection-molded, the mold can be set up to the inner lower end of each rib 555, thereby preventing the defect that the inner lower end of each rib 555 penetrates into the area of the opening 101. In addition, when the rib 555 is molded, it may facilitate the separation of the injection mold.

[0071] The viewing angle of camera module 1000 can be defined as a diagonal viewing angle, FOV, or DFOV (diagonal FOV). The diagonal viewing angle is the viewing angle of the entire optical system in the diagonal direction of image sensor 192. The horizontal viewing angle (HFOV: horizontal FOV) of camera module 1000 is the viewing angle of the entire optical system in the direction of the long axis of image sensor 192, and the vertical viewing angle (VFOV: vertical FOV) is the viewing angle of the entire optical system in the direction of the short axis of image sensor 192. The diagonal viewing angle can be greater than the horizontal and vertical viewing angles.

[0072] Conditional formula 7: 90°-(3 / 4*FOV)≤R1≤90°-(1 / 2*FOV)

[0073] Conditional formula 8: 90°-(3 / 4*FOV)≤R2≤90°-(1 / 2*FOV)

[0074] In Conditional Formulas 7 and 8, each of the first angle R1 and the second angle R2 can be greater than the angle of view FOV and less than 90 degrees, preferably within a range of 49.5 degrees to 63 degrees or less. Since the opening 101 has a circular shape, the second angle R2 of the second inclined surface S13 can be set to be less than the maximum diagonal angle of view, thereby reducing the loss of incident light. If the lower and upper limits of the first angle R1 and the second angle R2 of Conditional Formulas 1 and 2 are exceeded, the optical path incident at the effective angle of view within the lens barrel 510 may be blocked, or the amount of light may be reduced, the rigidity of the rib may be reduced, the increase in the opening 101 may lead to an increase in the inflow of foreign matter from the outside, and light quantity control may be difficult.

[0075] In order for the opening 101 of the lens holder 510 not to interfere with the viewing angle of the optical system, the following conditional expression may be satisfied.

[0076] Conditional formula 9: 90°-(3 / 4*DFOV)≤R2≤90°-(DFOV*0.5)

[0077] Conditional expression 10: R1≤R2

[0078] DFOV is the viewing angle in the diagonal direction of the image sensor, and may be greater than 40 degrees, for example, in the range of 40 to 60 degrees or in the range of 40 to 50 degrees. Preferably, the first angle R1 may be less than 62.5 degrees or in the range of 57.5 degrees ± 5 degrees, and the second angle R2 may be 57.5 degrees ± 5 degrees. The camera module 1000 is a camera for a driving assistance device, and may be configured as a camera for driver monitoring to prevent accidents caused by fatigue, smoking, or inability to look forward while the driver is driving. Therefore, the viewing angle of the camera module 1000 is provided within the above range so that the driver's condition and surrounding conditions can be accurately sensed. The above-mentioned camera module 1000 can be applied to an infrared camera.

[0079] ImgH is 1 / 2 of the diagonal length of the image sensor. The first angle R1 and the second angle R2 may satisfy the following conditional expression.

[0080] Conditional formula 11: ImgH*11≤R1≤ImgH*14

[0081] Conditional formula 12: ImgH*11≤R2≤ImgH*14

[0082] In Conditional Formulas 11 and 12, the first angle R1 and the second angle R2 may satisfy Conditional Formula 1: ImgH*12≤R1≤ImgH*13.5 and / or Conditional Formula 2: ImgH*12≤R2≤ImgH*13.5. Satisfying these conditions based on the area of image sensor 192 can prevent a reduction in the amount of light incident on image sensor 192 and block unnecessary light from entering. In the specification, * represents multiplication.

[0083] The lens holder 510 of the lens barrel 550 has a shape with mutually different outer diameters. Even if thermal deformation occurs due to the lenses 111, 113, and 115 within, the material and outer diameter of the lens holder 510, along with the materials of the lenses, effectively suppresses thermal deformation of the lenses. The lens holder 510 houses at least two or more of the lenses disclosed above, and may include, for example, the first lens 111, the second lens 113, and the third lens 115. The lens holder 510 may be a cylindrical portion having a first outer diameter outside the first lens 111, a second outer diameter outside the second lens 113, and a third outer diameter outside the third lens 115. The dimensions of these outer diameters may have the following relationship: first outer diameter < second outer diameter < third outer diameter. The lens holder 510 may have a constant thickness outside each lens 111, 113, and 115, with this thickness being the straight-line distance from the inner surface to the outer surface of each lens 111, 113, and 115 on the contact side. Here, when the inner diameter of the inner surface in contact with each lens 111, 113, 115 is divided into a first inner diameter inside the first outer diameter, a second inner diameter inside the second outer diameter, and a third inner diameter inside the third outer diameter, the inner diameter of the lens holder 510 can satisfy the following relationship: first inner diameter < second inner diameter < third inner diameter.

[0084] like Figure 4 As shown, the housing 600 can be bonded to the outer periphery of the lens holder 510. A portion of the housing 600 can be disposed between the outer periphery of the main substrate 190 and the underside of the head 550. The housing 600 can be supported between the lower surface S15 of the head 550 and the main substrate 190. The housing 600 can be bonded to the lower surface S15 of the head 550 using an adhesive 650. The housing 600 protects the outer surfaces of the lens barrel 500 and the image sensor 192, blocks the inflow of foreign matter, and can be bonded to a mobile object such as a vehicle. The housing 600 can be adhered to the upper surface of the main substrate 190 and can be adhered to the bonding surface of the lens barrel 500, i.e., the outer lower surface of the head 550, using an adhesive 650. The adhesive 650 can be a resin material, such as an epoxy resin material or a silicone resin material.

[0085] Each lens 111, 113, 115 may include an active region having an effective diameter and an inactive region outside the active region, through which light enters. The flanges 111A, 113A, 115A of the lenses 111, 113, 115 may be the inactive region. The inactive region may be an area where light is blocked by the first and second light-shielding films 121, 123. The flanges 111A, 113A, 115A may extend in a direction perpendicular to the optical axis OA, in a radial direction, or in a circumferential direction within the active region of the lenses 111, 113, 115.

[0086] The first light-shielding film 121 may be arranged on the outer periphery between the first lens 111 and the second lens 113. The first light-shielding film 121 can function as a member to block light in the inactive area and can also function as an aperture. A spacer member 124 or at least one of the second light-shielding film 123, which maintains a gap, may be arranged on the outer periphery between the second lens 113 and the third lens 115. The spacer member 124 may have an inner hole and may be formed in a ring shape. The spacer member 124 may be arranged between the second light-shielding film 123 and the second lens 113. The spacer member 124 may be positioned closer to the object than the second light-shielding film 123, and the second light-shielding film 123 may be positioned closer to the sensor than the spacer member 124. Since the second lens 113 has a meniscus shape that bulges toward the sensor, the spacer member 124 may be arranged on the outer periphery of the second lens 113 to maintain an external gap between the second lens 113 and the third lens 115.

[0087] The spacer member 124 can maintain an external gap between the second lens 113 and the third lens 115. Without the spacer member 124, the flanges of the two lenses aligned along the optical axis would contact each other or would contact the second light-shielding film 123. At least one or all of the first light-shielding film 121, the spacer member 124, and the second light-shielding film 123 can function as spacers to maintain a gap between the lenses 111, 113, and 115. The first light-shielding film 121, the spacer member 124, and the second light-shielding film 123 can use internal apertures to control the amount and path of light and function to block incident light.

[0088] The thickness of the first light shielding film 121 and the second light shielding film 124 may be thinner than the thickness T1 of the spacer member 124. Here, an aperture may be formed by the first light shielding film 121, or may be arranged around the second surface S2 on the sensor side of the first lens 111, or may be used as the second surface S2 on the sensor side.

[0089] The support member 125 may be arranged around the lower periphery of the third lens 115, and the support member 125 may press the third lens 115 to prevent it from detaching from the lower side, or may maintain a gap with the optical filter 196. Here, the support member 125 may be bonded to the optical filter 196 and the inner surface of the lens barrel 500 using an adhesive material 129. The outer diameter of the lens barrel 500 may be smallest at the outer periphery of the first lens 111 and may gradually increase toward the outer periphery of the third lens 115. The outer diameter of the lens barrel 500 may be largest at the outer circumference of the third lens 115 or the outer circumference of the optical filter 196.

[0090] Reference Figure 5The camera module 1000 with the lens barrel 500 can ensure optical performance by controlling the path of the first light L1 that reaches the end of the active area of each lens 111, 113, and 115 of the optical system. The first lens 111 can have negative or positive refractive power, and preferably has positive refractive power. The first lens 111 is closest to the object, and its first surface S1 on the object side on the optical axis OA can have a convex shape, while its second surface S2 on the sensor side can have a concave shape. As another example, the first surface S1 on the object side on the optical axis OA can have a concave shape, while the second surface S2 on the sensor side can have a concave shape. As another example, the first surface S1 on the object side on the optical axis OA can have a convex shape, while the second surface S2 on the sensor side can have a convex shape. The first lens 111 can be made of glass. The first lens 111 can be configured as a spherical lens made of glass. As another example, the first lens 111 can be configured as an aspherical lens made of glass. As another example, the first lens 111 can be configured as an aspherical lens made of plastic.

[0091] If the first lens 111 is made of glass, discoloration due to the plastic material can be prevented and deformation due to heat can be reduced when the camera module 1000 is exposed to light inside or outside the vehicle. If the camera module 1000 is set inside the vehicle or not exposed to the outside of the vehicle, the first lens 111 can be made of glass or plastic. The first lens 111 can have a refractive index of 1.7 or more, or in the range of 1.8 to 2.3. When expressed as an absolute value, the radius of curvature of the first surface S1 of the first lens 111 can be smaller than the radius of curvature of the second surface S2. The difference between the radius of curvature of the first surface S1 of the first lens 111 and the radius of curvature of the second surface S2 can be 1 mm or more, and can be, for example, in the range of 1 mm to 3 mm.

[0092] The center thickness of the first lens 111 can be the thickest among the lenses of the lens unit 100, and can be, for example, 1.2 mm or more. The effective diameter of the first surface S1 of the first lens 111 can be larger than the effective diameter of the second surface S2. The first lens 111 can include a first flange portion 111A on the outer side. A portion of the outer side of the first flange portion 111A can contact the inner surface of the lens barrel 500.

[0093] The second lens 113 and the third lens 115 can be made of a different material than the first lens 111. The second lens 113 can have negative or positive refractive power, preferably positive. The second lens 113 can be made of glass or plastic, preferably plastic. The second lens 113 is arranged between the first lens 111 and the third lens 115 and can have a second flange portion 113A on its outer side. On the optical axis, the object-side third surface S3 of the second lens 113 can be concave, and the sensor-side fourth surface S4 can be convex. As another example, the object-side third surface S3 can be convex, and the sensor-side fourth surface S4 can be concave. As another example, the object-side third surface S3 can be convex, and the sensor-side fourth surface S4 can be convex. The third and fourth surfaces S3 and S4 can be aspherical on the optical axis. A portion of the outer side of the second flange portion 113A of the second lens 113 can contact the inner surface of the lens barrel 500.

[0094] The refractive power of the third lens 115 may have the same sign as the refractive power of at least one of the first lens 111 and the second lens 113. The third lens 115 may have negative or positive refractive power, and preferably has positive refractive power. When the first lens 111, the second lens 113, and the third lens 115 have the same positive refractive power, the total optical axis length (TTL) can be reduced. The third lens 115 can be made of glass or plastic, and preferably plastic. The third lens 115 is arranged between the second lens 113 and the optical filter 196 and may have a third flange portion 115A on the outer side. On the optical axis, the fifth surface S5 on the object side of the third lens 115 may be convex, and the sixth surface S6 on the sensor side may be concave. As another example, the fifth surface S5 on the object side may be concave, and the sixth surface S6 on the sensor side may be convex. As another example, the fifth surface S5 on the object side may be concave, and the sixth surface S6 on the sensor side may be concave. The fifth surface S5 and the sixth surface S6 may be aspherical on the optical axis. A portion of the outer portion of the third flange portion 115A of the third lens 115 may contact the inner surface of the lens barrel 500 .

[0095] The refractive index of the second lens 113 may be lower than that of the first lens 111 and may be less than 1.7, for example, within the range of 1.45 to 1.69. The refractive index difference between the second lens 113 and the first lens 111 may be greater than 0.2. The refractive index of the third lens 115 may be lower than that of the first lens 111 and may be less than 1.7, for example, within the range of 1.45 to 1.69. The refractive index difference between the third lens 115 and the first lens 111 may be greater than 0.2. Expressed as an absolute value, the radius of curvature of the third surface S3 of the second lens 113 may be greater than the radius of curvature of the convex fourth surface S4 and, for example, may be 7 mm or less, or within the range of 5 mm to 7 mm. For example, the absolute value of the radius of curvature of the fourth surface S4 may be less than 5 mm and may be within the range of 2 mm to 4.99 mm. The difference between the radius of curvature of the third surface S3 and the radius of curvature of the fourth surface S4 of the second lens 113 may be greater than 1 mm and, for example, within the range of 1 mm to 4 mm. When expressed as absolute values, the radius of curvature of the fifth surface S5 of the third lens 115 may be greater than the radius of curvature of the concave sixth surface S6, and may, for example, be greater than 1.1 mm or within the range of 1.1 mm to 3 mm. The absolute value of the radius of curvature of the sixth surface S6 may be less than 2 mm, and may, for example, be within the range of 1.1 mm to 2 mm. The difference between the radius of curvature of the fifth surface S5 and the radius of curvature of the sixth surface S6 of the third lens 115 may be less than 1.3 mm. When expressed as absolute values, the lens surface with the largest radius of curvature may be the third surface S3, and the lens surface with the smallest radius of curvature may be the sixth surface S6. The absolute value of the largest radius of curvature may be greater than twice the smallest radius of curvature.

[0096] The center thickness of the second lens 113 may be the second thickest among the lenses in the lens portion 100 and may be thinner than the center thickness of the first lens 111 and thicker than the center thickness of the third lens 113. The center-to-center distance between the first lens 111 and the second lens 113 may be smaller than the thickness of the first lens 111 and larger than the center-to-center distance between the second lens 113 and the third lens 115. The effective diameter of the third surface S3 of the second lens 113 may be smaller than the effective diameter of the fourth surface S4. The effective diameter of the third surface S4 may be larger than the effective diameter size of the second surface S2 and smaller than the effective diameter size of the first surface S1. The effective diameter of the fifth surface S5 of the third lens 115 may be smaller than the effective diameter of the sixth surface S6. The effective diameter of the sixth surface S6 may be the largest among the lenses.

[0097] The second lens 113 is made of plastic or glass. Plastic has a higher thermal expansion coefficient than glass, potentially leading to more significant thermal deformation. In embodiments of the present invention, when the second lens 113 is made of plastic and experiences thermal deformation due to the difference in curvature radius between the third surface S3 and the fourth surface S4, the load caused by the contact between the outer surface of the second flange portion 113A and the inner surface of the lens holder 510 can be reduced, thereby mitigating thermal deformation. Specifically, by reducing the contact area between the outer surface of the second flange portion 113A of the second lens 113 and the lens holder 510 and positioning the outer surface closer to the sensor side than the object side, the difference in curvature radius between the third surface S3 and the fourth surface S4 of the second lens 113, as well as thermal deformation caused by the plastic material, can be reduced. Therefore, the outer surface of the second lens 113 can have non-contact inclined surfaces above and below the contact surface.

[0098] The outer surface of the third flange portion 115A of the third lens 115 can contact the inner surface of the lens holder 510. When the third lens 115 is made of plastic, the length of the outer contact surface of the third flange portion 115A can be less than 50% of the thickness of the third flange portion 115A, or can be in the range of 20% to 50%. Furthermore, when the third lens 115 is made of plastic, it can have a higher coefficient of thermal expansion than glass, potentially causing more significant thermal deformation. In an embodiment of the present invention, when the fifth and sixth surfaces S5, S6 of the third lens 115 have different radii of curvature, the outer surface of the third flange portion 115A can be positioned so that the contact position with the inner surface of the lens holder 510 is closer to the sensor side and provides a non-contact area larger than the contact area, thereby minimizing the difference in the curvature radii of the two surfaces S5 and S6 and thermal deformation caused by the plastic material.

[0099] The camera module 1000 according to an embodiment of the present invention can prevent light leakage and control the light path and light amount through the components 121, 123, 124, which are arranged on the outer periphery between the lenses 111, 113, 115 to maintain a gap. At least one or all of the components 121, 123, 124 that maintain the gap are formed of a plastic material and can expand or contract according to the plastic lens. Therefore, the components 121, 123, 124 that maintain the gap can reduce thermal deformation of the plastic lens and reduce the problem of misalignment of the optical axes of the lenses 111, 113, 115. Light incident on the lens portion 100 is refracted and transmitted along the effective area of each lens 111, 113, 115, and is transmitted to the image sensor 192 through the optical filter 196 and the cover glass 194. The above-mentioned image sensor 192 converts the incident light into an electrical signal. At this time, the space-maintaining members 121 , 123 , and 125 may be placed outside the boundary between the active area and the inactive area of two adjacent lenses 111 , 113 , and 115 .

[0100] Because the members 121, 123, and 124 are spaced apart, the first light-shielding film 121, the spacer member 124, and the second light-shielding film 123 block and absorb incident light that deviates from the optical path, thereby controlling the amount of light that passes through the apertures of the first light-shielding film 121, the spacer member 124, and the second light-shielding film 123, as well as the aperture of the support member 125. The first light-shielding film 123 is arranged between the first flange portion 111A of the first lens 111 and the second flange portion 115A of the second lens 113 and may extend in the direction of the optical axis. The first light-shielding film 121 may have a thickness of 0.1 mm or less, for example, in the range of 0.01 mm to 0.1 mm or 0.01 mm to 0.04 mm. The first light-shielding film 121 has this thickness and includes a light-absorbing layer on its upper and / or lower surfaces to absorb light that deviates from the optical path or has an abnormal path. The second light-shielding film 123 can be arranged between the second flange portion 113A of the second lens 113 and the third flange portion 115A of the third lens 115. The first and second light-shielding films 123, 124 are formed of a plastic material and may include a light-absorbing layer. The second light-shielding film 123 may have a thickness of 0.1 mm or less, for example, within a range of 0.01 mm to 0.1 mm or 0.01 mm to 0.04 mm. The second light-shielding film 123 has the aforementioned thickness and includes a light-absorbing layer on its upper and / or lower surfaces to absorb light that deviates from the optical path or takes an abnormal path. The first and second light-shielding films 121, 123 may be made of the same material. They may include polyethylene (PE) or polyester (PET) films. The first and second light-shielding films 121, 124 may have a multilayer structure and may have the same laminated structure. The first and second light-shielding films 121, 124 may have the same thickness. The first light shielding film 121 is formed of a plastic material and may include a light absorbing layer.

[0101] The spacer member 124 is disposed between the second flange portion 113A of the second lens 113 and the third flange portion 115A of the third lens 115, and can separate the third flange portion 115A of the third lens 115 from the second flange portion 113A of the second lens 113 by a predetermined distance. The spacer member 124 can include a polyethylene (PE) film or a polyester (PET) film. As another example, at least one of the first light-shielding film 121, the second light-shielding film 123, and the spacer member 124 can be formed of a metal or an alloy, and an oxide film can be formed on its surface. The material contained in the metal or alloy can include at least one of the following elements: In, Ga, Zn, Sn, Al, Ca, Sr, Ba, W, U, Ni, Cu, Hg, Pb, Bi, Si, Ta, H, Fe, Co, Cr, Mn, Be, B, Mg, Nb, Mo, Cd, Sn, Zr, Sc, Ti, V, Eu, Gd, Er, Lu, Yb, Ru, Y, and La. The oxide film may be an oxide material treated with black oxide or brown oxide using copper.

[0102] The image sensor 192 may be disposed on the main substrate 190. The main substrate 190 may be mounted, placed, contacted, fixed, temporarily fixed, supported, or coupled to the image sensor 192 on a plane intersecting the optical axis (OA). Alternatively, according to another embodiment, a groove or hole (not shown) capable of accommodating the image sensor 192 may be formed on the main substrate 190, and this embodiment is not limited to a specific form in which the image sensor 192 is disposed on the main substrate 180. The main substrate 190 may be a rigid PCB or an FPCB. The image sensor 192 may perform the function of converting light passing through the lens unit 100 into image data. A sensor module may be disposed on the lower portion of the lens barrel 500 and surround the image sensor 192, protecting the image sensor 192 from external foreign matter or impact. The image sensor 192 may be one of a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS), a CPD, and a CID. When multiple image sensors 192 are present, one may be a color (RGB) sensor and the other may be a black and white sensor.

[0103] The optical filter 196 may be disposed between the lens portion 100 and the image sensor 192. The optical filter 196 may filter light corresponding to a specific wavelength range from light passing through the lenses 111, 113, and 115. The optical filter 196 may be an infrared (IR) blocking filter that blocks infrared rays or an ultraviolet (UV) blocking filter that blocks ultraviolet rays, but the embodiment is not limited thereto. The optical filter 196 may be disposed on the image sensor 192.

[0104] The cover glass 194 is arranged between the optical filter 196 and the image sensor 192, and can protect the upper part of the image sensor 192 and prevent the reliability of the image sensor 192 from being deteriorated. The camera module 1000 according to an embodiment of the present invention may include a driving member (not shown), and the driving member may cause the lens barrel having at least one lens to move or tilt in the optical axis direction or / and in a direction orthogonal to the optical axis direction. The camera module may include an autofocus (AF) function or / and an optical image stabilizer (OIS) function. The camera module 1000 according to an embodiment of the present invention may be applied to an infrared camera or a driver monitoring camera.

[0105] like Figure 5 As shown, the ends P1 to P6 of the effective areas of each of the first lens 111, the second lens 113, and the third lens 115 may be effective radii based on the optical axis OA. The effective radius of the first surface S1 of the first lens 111 is R11, where R11 is the straight-line distance from the optical axis to the end P1 of the effective area. The effective radius of the second surface S2 is R12, where R12 is the straight-line distance from the optical axis to the end P2 of the effective area. The effective radii of the third surface S3 and the fourth surface S4 of the second lens 113 are R21 and R22, where R21 and R22 are the straight-line distances from the optical axis OA to the ends P3 and P4 of the effective area. The effective radius of the fifth surface S5 of the third lens 115 is R31, where R31 is the straight-line distance from the optical axis OA to the end P5 of the effective area. The effective radius of the sixth surface S6 is R32, where R32 is the straight-line distance from the optical axis OA to the end of the effective area. In addition, with the surface R10 of the image sensor 192 as a reference, the distance to the end of the effective area of each of the first surface S1 to the sixth surface S6 of each lens 111, 113, and 115 in the direction of the optical axis can be defined as H11, H12, H21, H22, H31, and H32.

[0106] The inner end of the first light shielding film 121 can be arranged closer to the optical axis than the end P2 of the effective area of the second surface S2. The inner end of the first light shielding film 121 can be arranged closer to the second surface S2 than the third surface S3. Here, when the first light shielding film 121 functions as an aperture and the radius of the inner aperture is ST_R0, the following conditional expression can be satisfied.

[0107] Conditional formula 13: R11 <R12<ST_R0

[0108] Conditional formula 14: ST_R0 <R21<R22<R31<R32

[0109] According to Conditional Equations 13 and 14, the effective diameter gradually decreases from the object-side surface of the first lens 111 toward the aperture, and the effective diameter gradually increases from the aperture toward the final lens surface. Due to the position and inner diameter of the first light-shielding film 121, light traveling within the optical system can be cut to achieve desired optical performance, such as relative illumination (RI) and an F-number of 2.2 or less.

[0110] An end P1 of an effective area of the first surface S1 of the first lens 111 may be disposed closest to the bottom F1 of the opening 101. An optical axis distance from an end P1 to P6 of an effective area of each lens surface S1 to S6 to a surface of the image sensor 192 may satisfy the following conditional equation.

[0111] Conditional expression 15:1 <H11 / H12<1.5

[0112] Conditional expression 16: 1.3 <H11 / H21<1.7

[0113] Conditional expression 17:1 <H21 / H22<1.5

[0114] Conditional expression 18:2 <H11 / H31<3

[0115] Conditional expression 19: 1.2 <H31 / H32<1.6

[0116] Condition 20: (H12-H21) < (H22-H31)

[0117] By means of Conditional Formulas 15, 17, and 19, the effective radius and edge thickness of the first to sixth surfaces S1 to S6 of the first lens 111, the second lens 113, and the third lens 115 can be set, thereby setting the path of the first light L1 traveling to the outermost portion of the effective area of the lens. By means of Conditional Formulas 16 and 18, the edge thickness of each lens and the edge spacing between adjacent lenses can be set according to the end P1 of the effective area of the first surface S1 of the first lens 111. In Conditional Formula 20, the value of (H12-H21) can set the edge spacing between the first lens 111 and the second lens 113, and the value of (H22-H31) can set the edge spacing between the second lens 113 and the third lens 115. The thickness T1 ( Figure 6 ) can be set by condition 20.

[0118] Conditional formula 21: (H22-H31) <T1

[0119] In Conditional Expression 21, the thickness T1 of the spacer member 124 can be ensured by the convex sensor-side surface S4 of the second lens 113 and the gull-side surface S6 of the third lens 115. Preferably, 1 can be satisfied. <T1 / (H22-H31)<1.5。

[0120] The camera module according to the embodiment disclosed above may satisfy at least one or two or more of the mathematical formulas described below. Therefore, the camera module according to the embodiment may have improved optical properties. For example, when the camera module satisfies at least one mathematical formula, the camera module may alleviate thermal deformation of the lens, effectively control aberration characteristics (e.g., chromatic aberration and distortion aberration), and may have good optical performance in the center and periphery of the field of view (FOV). In addition, the camera module 1000 may have improved resolution. In addition, the thickness of the lens on the optical axis (OA) and the spacing between adjacent lenses on the optical axis (OA) described in the mathematical formula may refer to the above-mentioned embodiments.

[0121] [Mathematical formula 1]1 <CT1 / CT2<2

[0122] CT1 is the center thickness of the first lens 111, and CT2 is the center thickness of the second lens 113. If the camera module satisfies Math. 1, aberration characteristics of the optical system may be improved.

[0123] [Mathematical formula 2]2 <CT1 / CT3<4

[0124] CT3 is the center thickness of the third lens 115. If the camera module satisfies Math Formula 2, the aberration characteristics of the optical system may be improved.

[0125] [Mathematical formula 3]1 <CT1 / CG1<2.5

[0126] CG1 is the center distance between the first lens and the second lens. If the camera module satisfies Math Formula 3, the center thickness of the first lens 111 and the center distance between the first lens and the second lens can be set to provide good optical performance at a set viewing angle and focal length, and TTL can be reduced.

[0127] [Mathematical formula 4]2 <CT2 / CG2<5

[0128] CG2 is the center distance between the second lens and the third lens. If the camera module satisfies Equation 4, the center thickness of the second lens 113 and the center distance between the second lens and the third lens can be set to provide good optical performance at a set viewing angle and focal length, and TTL can be reduced.

[0129] [Math 5] 1.7 <n1

[0130] In Math 5, n1 is the refractive index of the first lens 111 at the d-line. When Math 5 is satisfied, the first lens 111 may refract light from the convex first surface (S1) to an effective area of the second surface (S2) having the smallest effective diameter.

[0131] [Mathematical formula 6]n3*v3 <n1*v1

[0132] In Math 6, n3 is the refractive index of the third lens at the d-line, and v1 and v3 are the Abbe numbers of the first lens and the third lens. When the camera module satisfies Math 6, the first lens 111 can guide incident light to the effective area of the third lens 115.

[0133] [Mathematical formula 7] L1R1>0

[0134] L1R1 is a curvature radius on the optical axis of the object-side surface S1 of the first lens 111. If Math. 7 is satisfied, the amount of incident light on the first lens 111 may be increased.

[0135] [Formula 8] L1R1 <L1R2

[0136] L1R2 is the curvature radius on the optical axis of the sensor-side surface S2 of the first lens 111. If Math. Equation 8 is satisfied, the inner hole size of the first light shielding film 121 can be reduced, and the total TTL can be reduced.

[0137] [Mathematical formula 9] L1R2*CA12 <L1R1*CA11

[0138] CA11 and CA12 are effective diameters of the object-side surface S1 and the sensor-side surface S2 of the first lens 111. If Math 9 is satisfied, the amount of incident light can be increased by the small curvature radius and large effective diameter of the first surface S1.

[0139] [Mathematical formula 10]1 <CA_Max / CA_Min<3

[0140] CA_Max is the maximum effective diameter of each lens surface S1 to S6, and CA_Min is the minimum effective diameter of each lens surface S1 to S6. If Math 10 is satisfied, the size of the camera module and the outer shape of the lens holder 510 can be set.

[0141] [Mathematical formula 11]1 <CA11 / CA12<3

[0142] If Math Formula 11 is satisfied, a path along which light travels to the aperture Stop may be controlled by setting an effective diameter difference between the first surface S1 and the second surface S2 of the first lens 111 .

[0143] [Math 12] 0.5 <CA11 / CA32<1

[0144] CA32 is the effective diameter of the sixth surface S6 of the third lens 115. If Equation 12 is satisfied, the effective diameter difference between the first surfaces S1 and S2 of the first lens 111 and the sensor-side surface S6 of the final lens can be controlled, thereby controlling factors that affect performance variations depending on CRA and temperature. Furthermore, the sizes of the first lens 111 and the third lens 115 can be controlled.

[0145] [Mathematical formula 13] 2mm <ImgH

[0146] ImgH is 1 / 2 of the diagonal size of the image sensor 192. If Math 13 is satisfied, an optical system having the sensor size of a vehicle-mounted camera can be provided. Preferably, Math 52 satisfies 2 mm <ImgH<4mm。

[0147] [Mathematical formula 14]1 <TTL / (ImgH*2)<2

[0148] TTL is the optical axis distance from the center of the first surface S1 of the first lens 111 to the image sensor 192. If Math Formula 14 is satisfied, the length of the entire optical system can be set relative to the size of the image sensor.

[0149] [Mathematical formula 15]0 <BFL / ImgH<1

[0150] The BFL is the optical axis distance from the center of the sensor-side surface of the final lens to the surface of the image sensor. If Math Formula 15 is satisfied, it is possible to ensure installation space for components (194, 196) between the image sensor and the final lens, and to provide space for guiding light from the final lens toward the image sensor.

[0151] [Mathematical formula 16]0 <CA_Max / (D1+D2)<1

[0152] In Math 16, (D1+D2) is the height of the lens barrel 500, which represents the sum of the height of the lens holder 510 and the height of the head 520. If Math 16 is satisfied, the maximum effective diameter of the lens surface and the height of the lens barrel 500 can be set, thereby setting the size of the camera module.

[0153] [Mathematical formula 17]0 <TD / (D1+D2)<1

[0154] TD is the optical axis distance from the object side of the first lens 111 to the sensor side of the last lens in the lens holder. If Math 17 is satisfied, the optical axis length of the lens in the lens holder and the length of the lens barrel can be set.

[0155] [Mathematical formula 18]0 <CA_Max / B1<0.5

[0156] B1 is the maximum effective diameter of the lens barrel and is the outer diameter of the head. If Math 18 is satisfied, the maximum effective diameter of the lens surface and the maximum effective diameter of the lens barrel can be set to facilitate injection molding and assembly of the lens barrel.

[0157] [Mathematical formula 19]1 <CA_Max / B0<1.5

[0158] B0 is the diameter of the opening 101 of the lens portion 100. If Math. 19 is satisfied, the maximum effective diameter of the lens and the size of the opening 101 can be set to control the path of incident light.

[0159] [Mathematical formula 20] 0.5 <CA11 / B0<1

[0160] If Math. 20 is satisfied, the size of the opening 101 and the effective diameter of the object-side surface of the first lens 111 may be set to prevent inflow of light traveling through an unnecessary path.

[0161] [Mathematical formula 21] 0.3 <CA32 / (D5*2)<0.7

[0162] D5 is the straight-line distance from the optical axis to the lower outer surface of the lens holder 510 and is the lower radius of the lens holder 510. If Math. 21 is satisfied, the last lens disposed in the lens holder 510 and the lower outer diameter of the lens holder 510 can be set to the above range, thereby facilitating the bonding of the last lens.

[0163] [Math 22] 0.7 <D2 / FD<1.2

[0164] FD represents the distance from the center of the object-side surface of the first lens 111 to the lower surface of the optical filter. If Math. 22 is satisfied, the height of the lens holder 510 may be set based on the optical axis distance from the first lens incorporated in the lens holder 510 to the optical filter.

[0165] [Math 23] 0.4 <CA_FD / (D5*2)<0.9

[0166] CA_FD is the effective length of the optical filter, which is the average of the effective lengths of the seventh surface on the object side and the eighth surface on the sensor side, as shown in Table 1. If Math Formula 23 is satisfied, the optical filter having the maximum effective length and size within the lens holder 510 and the lower outer diameter of the lens holder 510 can be set.

[0167] [Mathematical formula 24]0 <nGL<nPL

[0168] nGL is the number of glass lenses in the lens, and nPL is the number of plastic lenses in the lens. If Math Formula 24 is satisfied, thermal changes within the camera module can be mitigated, and the plastic lenses can improve optical characteristics such as aberration and distortion.

[0169] [Math 25]4<(nL*D1*D2) / TTL<8

[0170] nL is the total number of lenses in the lens holder 510, which is 3 to 5. If Math Formula 25 is satisfied, the size of the camera module compared to the total TTL can be set.

[0171] [Mathematical formula 26]1 <Fno<nL

[0172] Fno is the F number of the optical system. If Mathematical Formula 26 is satisfied, a bright optical system can be provided. Here, Fno can satisfy 2±0.2.

[0173] [Mathematical formula 27] 10 < ∑Abbe / ∑Index < 30

[0174] ∑Abbe refers to the sum of the Abbe numbers of each lens in the plurality of lenses. ∑Index refers to the sum of the refractive indices of each lens in the plurality of lenses. If Equation 27 is satisfied, the optical system can have improved aberration characteristics and resolution. In Equation 27, the optical characteristics can be controlled by setting the sum of the Abbe numbers and the sum of the refractive indices of the lenses. Preferably, 15 < ∑Abbe / ∑Index < 25 can be satisfied.

[0175] [Mathematical formula 28]40°≤FOV≤50°

[0176] FOV is the field of view (FOV) of the optical system in the camera module, that is, the diagonal field of view. Even if a camera module uses a mixture of glass and plastic lenses, Equation 28 can prevent optical degradation through temperature compensation and aberration correction. Alternatively, even if a camera module uses a mixture of spherical and aspherical lenses, Equation 28 can prevent optical degradation through temperature compensation and aberration correction.

[0177] [Math 29] TTL ≤ 9 mm

[0178] In Math 29, the optical axis distance from the center of the first surface S1 of the first lens 111 to the surface of the image sensor in the camera module is set to reduce the size of the camera module. Preferably, D4≤TTL may be satisfied.

[0179] Lens data of the first lens 111 to the third lens 115 according to an embodiment of the present invention are shown in Table 1.

[0180] [Table 1]

[0181]

[0182] Table 1 shows each of the above mathematical formulas in the camera module 1000 of this embodiment, which represents the radius of curvature of the lens surface of each lens, the center thickness of each lens, the center spacing between adjacent lenses, the refractive index of each lens, the Abbe number, and the effective radius of each lens surface. The value of each of the above items can have an error range of less than 0.5%. Here, when the lens unit 100 is stacked by mixing plastic lenses and at least one glass lens, the thermal deformation caused by the lens of the plastic material can be minimized. For example, by providing a relaxation structure (relaxation structure) of the second lens 113 and the third lens 115, it is possible to compensate for the thermal deformation, and the MTF change rate of the diffraction optical performance at high temperature (e.g., 80 degrees to 105 degrees) can be provided to be less than 10% compared to room temperature (e.g., 20 degrees to 30 degrees). High temperature can include the temperature inside or outside the vehicle. In an embodiment of the present invention, in order to reduce the thermal deformation of the second lens 113 and the third lens 115, the material of the lens barrel 500 can be a heat dissipation material, a material the same as the material of the plastic lens, or a metal material. The material of the lens barrel 500 according to an embodiment of the present invention can be a plastic material, for example, a plastic material with the thermal expansion coefficient identical with the thermal expansion coefficient of a plastic lens or the material identical with the material of a plastic lens. The head 550 of the lens barrel 500 can comprise a top view shape of a cylindrical shape or a polygonal cylinder shape. The surface of the lens barrel 500 can be coated or coated with a hydrophilic material. As another example, the lens barrel 500 can be selected from a metallic material, for example Al, Ag or Cu, and can be Al or an Al alloy. When the lens barrel 500 is made of metal, the heat transmitted to the lateral direction of the lens 111, 113, 115 can be dissipated, and the thermal deformation of the lens 111, 113, 115 can be suppressed.

[0183] Reference Figure 6 The spacer member 124 can be disposed between the second lens 113 and the second light-shielding film 123 and can be annular with an inner hole. The inner diameter K1 of the hole of the spacer member 124 can be larger than the inner diameter of the hole of the first light-shielding film 121 and smaller than the inner diameter of the hole of the second light-shielding film 123. Each inner diameter of the hole can be a minimum diameter. The spacer member 124 can be made of a material different from the light-absorbing material of the first light-shielding film 121 and the second light-shielding film 124. The spacer member 124 can be made of a plastic material or a plastic material that can be injection molded. The thickness T1 of the spacer member 124 can be thicker than the thickness of the first light-shielding film 121 and the second light-shielding film 124. The thickness T1 of the spacer member 124 can be thicker than the sum of the thicknesses of the first light-shielding film 121 and the second light-shielding film 124.

[0184] When the thickness of the above-mentioned spacer member 124 is T1 and the center thicknesses of the second lens 113 and the third lens 115 are CT2 and CT3, the conditional formula: CT2 ≤ T1 < CT3 can be satisfied. The thickness T1 of the above-mentioned spacer member 124 can be 0.7 mm or more, for example, within the range of 0.7 mm to 1.1 mm, or within the range of 0.8 mm to 1.0 mm.

[0185] The spacer member 124 includes an inwardly protruding inner end 124A and a second concave portion 124B located at the upper inner part. The inner end 124A can extend from the upper surface of the third flange portion 115A to the end P4 of the effective area of the fourth surface S4 of the second lens 113. The inner end 124A of the spacer member 124 can be provided with an inclined inner surface, and the upper end of the inclined surface can be arranged closer to the optical axis OA than the lower end. The end of the inner end 124A of the spacer member 124 (or the upper end of the inclined surface) can correspond to or be arranged adjacent to the end P4 of the effective area of the fourth surface S4.

[0186] The third inclined surface SS1 of the inner end 124A of the spacer member 124 can vertically overlap with the end P5 of the effective area of the fifth surface S5 of the third lens 115. That is, the third inclined surface SS1, which is the inclined inner surface of the spacer member 124, is farther away from the optical axis OA from top to bottom, so that the interference position of the first light L1 passing through the end P4 of the effective area of the fourth surface S4 and the end P5 of the effective area of the fifth surface S5 can be avoided. The third inclined surface SS1 of the inner end 124A of the above-mentioned spacer member 124 overlaps with the second light-shielding film 123 by more than 50% in the vertical direction, so that the light reflected by the third inclined surface SS1 does not travel to the effective area of the lens and can be absorbed by the second light-shielding film 123.

[0187] The above-mentioned spacer member 123 can prevent the occurrence of phenomena such as ghosting or flare caused by stray light. The position of the upper end of the inner end 124A of the above-mentioned spacer member 124 or the upper end of the third inclined surface SS1 is spaced from the optical axis OA by a first distance K1, and the first distance K1 can be greater than the effective radius R22 of the second lens 113. That is, R22 < K1 can be satisfied, and K1 ≥ 1.489 mm can be satisfied. The position of the lower end of the inner end 124A of the spacer member 124 or the lower end of the inclined inner surface SS1 is spaced from the optical axis OA by a second distance K2, and the second distance K2 can be greater than the effective radius R31 of the third lens 115. That is, K1 < R31 < K2 can be satisfied, and K2 ≥ 1.695 mm.

[0188] The outer angle of the third inclined surface SS1 of the above-mentioned spacer member 124 has a fourth angle R4 with respect to the horizontal straight line, and the straight line passing through the end P4 of the effective area of the fourth surface S4 of the second lens 113 and the end P5 of the effective area of the fifth surface S5 of the third lens 115 may have an inner angle of a third angle R3 with respect to the horizontal straight line. The third angle R3 and the fourth angle R4 may satisfy R4≤R3, and when R4≤R3 is satisfied, the first light L1 can be prevented from being incident on the third inclined surface SS1, and the abnormal light incident on the third inclined surface SS1 can be reflected and absorbed by the second light-shielding film 123. Preferably, the conditional expression: R4<R3 or 1.5<R3 / R4<2.0 can be satisfied. That is to say, the fourth angle R4 may be less than or equal to the angle of the optical path of the first light L1 passing between the second lens 113 and the third lens 115. The third angle R3 and the fourth angle R4 may satisfy the following conditional expressions compared with the field of view FOV.

[0189] Conditional expression 1: FOV<R3

[0190] Conditional expression 2: R4≤FOV

[0191] Conditional expression 3: 54 degrees<R3<90 degrees

[0192] When the fourth surface (S4) of the second lens 113 is convex with respect to the upper surface of the second light-shielding film 123, the protruding area S41 between the second flange portion 113A and the end P4 of the effective area of the fourth surface S4 may vertically overlap with the inner end 124A of the spacer member 124. At this time, the spacer member 124 is provided with a second concave portion 124B in the area corresponding to the protruding area S41 to prevent contact with the protruding area S41. The depth T2 of the second concave portion 124B may be less than 50% of the thickness T1 of the spacer member 124. The conditional expression: 0.1<T2 / T1<0.5 can be satisfied. Here, T2 is within the range of 0.35 mm±5%, and may vary according to the spherical coefficient or aspherical coefficient of the fourth surface S4.

[0193] The horizontal width W1 of the second concave portion 124B may satisfy the following conditional expressions.

[0194] Conditional expression 1: W1≤(K2-K1)

[0195] The fourth angle R4 may satisfy the following conditional expressions.

[0196] Conditional expression 2: R4=arctan(T3 / (K2-K1))

[0197] Through these conditions, the spacer member 123 is arranged as much as possible along the path of the first light L1, so that the occurrence of phenomena such as ghosting or flare due to stray light on the image sensor 192 can be prevented.

[0198] Referring to Figure 7 , the support member 125 is a lower ring or a press - fit member, and includes an inner part 51, a third recess 125A in the upper part of the inner side, and a lower protrusion 53. The inner part 51 has an inclined surface, and the upper end of the inclined inner surface of the inner part 51 corresponds to the end P6 of the effective area of the sixth surface S5 of the third lens 115, and may be inclined from the upper end to the lower end of the inclined inner surface. The inner part 51 may vertically overlap with the non - effective area of the optical filter 196. The inclined inner surface of the inner part 51 may be inclined at a sixth angle R6 with respect to a horizontal straight line. The first light L1 may be refracted from the third lens 115 toward the optical filter 196 along the inner side of the inclined inner surface of the inner part 51. The distance between the upper end of the inclined inner surface of the inner part 51 and the optical axis OA is K5, the distance between the lower end and the optical axis is K6, and the distance from the optical axis OA to the end P7 of the effective area of the optical filter 196 may be defined as K7.

[0199] Condition 1: K6 < K5

[0200] Condition 2: R32 ≤ K5

[0201] Condition 3: R32 < K7

[0202] Condition 4: K7 ≤ K6

[0203] R32 is the effective radius of the sixth surface S6 of the third lens 115.

[0204] The first light L1 travels from the end P6 of the effective area of the sixth surface S6 of the third lens 115 to the end P7 of the effective area of the optical filter 196. At this time, the straight line connecting the ends P6 and P7 may be inclined at a fifth angle R5 with respect to a horizontal straight line. The fifth angle R5 and the sixth angle R6 may satisfy R6 ≤ R5, and when R6 ≤ R5 is satisfied, the first light L1 can be prevented from being incident on the inclined surface of the support member 125, and the abnormal light incident on the inclined surface can be absorbed. Preferably, the conditional formula: R6 < R5 or 1 < R5 / R6 < 1.5 can be satisfied. That is to say, the sixth angle R6 may be less than or equal to the angle of the optical path of the first light L1 passing between the peripheries of the third lens 115 and the optical filter 196. The fifth angle R5 and the sixth angle R6 may satisfy the following conditional formulas compared with the viewing angle FOV.

[0205] Condition 1: FOV < R5

[0206] Condition 2: FOV < R6

[0207] Condition 3: 54 degrees < R6 < 70 degrees

[0208] When the edge portion of the effective area of the sixth surface S6 of the third lens 115 has a convex shape with respect to the upper surface of the support member 125, a convex area between the third flange portion 115A and the end P6 of the effective area of the sixth surface S6 may overlap with the inner portion 51 of the support member 125 in a vertical direction. In this case, the support member 125 is provided with a third concave portion 125A in a region corresponding to the convex area to prevent contact with the convex area.

[0209] The depth T5-T6 of the third concave portion 125A may be less than 50% of the thickness T5 of the support member 125. The conditional expression 0<(T5-T6) / T5<0.2 may be satisfied. Here, the value of (T5-T6) is within the range of 0.1 mm ± 5% and may vary depending on the spherical coefficient or aspherical coefficient of the sixth surface S6.

[0210] The horizontal width W2 of the third recess 125A may satisfy the following conditional expression.

[0211] Conditional formula 1: W2 ≥ (K6 - K5)

[0212] The sixth angle R6 may satisfy the following conditional expression.

[0213] Conditional formula 2: R6 = arctan(T6 / (K6-K5))

[0214] Through these conditions, the support member 125 is disposed as much as possible along the path of the first light L1 , so that it is possible to prevent a phenomenon such as ghosting or flare from occurring on the image sensor 192 due to stray light.

[0215] The lower surface 52 of the support member 125 is disposed on the inactive area of the optical filter 196, and the lower protrusion 53 may be bonded by the adhesive material 129. The adhesive material 129 may fill the area between the inner surface of the lens holder 510 and the lower protrusion 53 and the area between the lower protrusion 53 and the optical filter 196, and may adhere them.

[0216] Reference Figure 8 (A) and Figure 8 (B), the MTF is measured while reducing the thickness of the first light shielding film 121, and the best focus position is optimized by reducing the thickness from the first thickness to the second thickness. Figure 8 (A) shows the MTF characteristics of the optical system when the first light-shielding film has a first thickness and the first thickness is 20 μm or more (for example, in the range of 20 μm to 26 μm). Figure 8 (B) shows the MTF characteristics of the optical system when the first light-shielding film has the second thickness and the second thickness is less than 20 μm (for example, in the range of 14 μm to 18 μm). Figure 8 (A) and Figure 8 As shown in (B), it can be seen that: gap differences (G1, G2) appear in the central area and peripheral areas of the MTF curve diagram of the optical system, and the gap between the first lens and the second lens is reduced by the first light-shielding film having the second thickness, so that the center position can improve peripheral resolution and minimize field curvature.

[0217] Figure 9 1 is an example of a plan view of a vehicle to which a camera module according to an embodiment of the present invention is applied. Figure 9 According to an embodiment of the present invention, an in-vehicle camera system may include: an image generation unit 11; a first information generation unit 12; second information generation units 21, 22, 23, and 24; and a control unit 14. The image generation unit 11 may include at least one camera module 20 disposed in the vehicle and may capture the front of the vehicle and / or the driver to generate a front image or an interior image of the vehicle. Furthermore, the image generation unit 11 may use the camera module 20 to generate images of the vehicle's surroundings or the driver and the front of the vehicle in one or more directions. The front and surrounding images may be digital images and may include color, black and white, and infrared images. Furthermore, the front and surrounding images may include still images and moving images. The image generation unit 11 provides the driver image, the front image, and the surrounding images to the control unit 14. The first information generation unit 12 may include at least one radar and / or camera disposed in the vehicle and detect the front of the vehicle to generate first detection information. Specifically, the first information generation unit 12 is disposed in the vehicle and detects the position and speed of vehicles disposed in front of the vehicle, as well as the presence and position of pedestrians, to generate the first detection information.

[0218] Using the first detection information generated by the first information generating unit 12, the distance between the own vehicle and the vehicle in front can be controlled to be maintained at a constant level, and the stability of the vehicle operation can be improved under specific preset circumstances, such as when the driver wants to change the driving lane of the own vehicle or when reversing to park. The first information generating unit 12 provides the first detection information to the control unit 14. Then, the second information generating units 21, 22, 23, 24 detect each side of the own vehicle based on the front image generated by the image generating unit 11 and the first detection information generated by the first information generating unit 12, and generate second detection information. Specifically, the second information generating units 21, 22, 23, 24 may include at least one radar and / or camera arranged on the own vehicle, and may detect the position and speed of the vehicle located on the side of the own vehicle or take images. Here, the second information generating units 21, 22, 23, 24 may be arranged on the front and rear sides of the vehicle, respectively.

[0219] The vehicle-mounted camera system may be equipped with the following camera modules and may provide or process information acquired through the front, rear, each side, or corner areas of the vehicle to a user to achieve autonomous driving or protect the surrounding safety of the vehicle and objects. Figure 10 As shown, the camera module 2320 is spaced apart from the driver by a predetermined distance d1, and the camera module 2320 captures the driver's situation and status and provides it to the vehicle management device so that it can be used as a driver monitoring system. The optical system of the camera module according to an embodiment of the present invention can be installed in multiple units in the vehicle for safety adjustment, enhancing autonomous driving functions and improving convenience. In addition, the optical system of the camera module is used in the vehicle as a component for control, such as a lane keeping assist system (LKAS), a lane departure warning system (LDWS) and a driver monitoring system (DMS). These on-board camera modules can achieve stable optical performance even when the ambient temperature changes, and provide price-competitive modules, thereby ensuring the reliability of vehicle components.

[0220] The 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 one embodiment. In addition, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified in other embodiments by those of ordinary skill in the art to which the embodiment belongs. Therefore, the content related to such combination and modification should be interpreted as being included in the scope of the present invention. In addition, although the embodiments have been described above, they are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention belongs will understand that various modifications and applications not illustrated above are possible without departing from the essential features of the present embodiment. For example, each component specifically shown in the embodiment can be modified and implemented. Moreover, the differences associated with such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. A camera module, comprising: a head portion having a side wall portion, a receiving space within the side wall portion, and a plurality of ribs; a lens barrel having an opening communicating with the accommodation space of the head and having a lens holder vertically passing through the opening; a lens portion having a plurality of lenses positioned within the lens holder; as well as an image sensor configured to convert light incident through the plurality of lenses into an electrical signal, wherein each of the plurality of ribs is spaced apart from each other on an upper peripheral edge of the opening, wherein each of the plurality of ribs has a first inclined surface on the upper peripheral edge of the opening, wherein the opening has a second inclined surface on the periphery, wherein a first angle as an inner angle between the first inclined surface and the horizontal line is denoted as R1, a second angle as an inner angle between the second inclined surface and the horizontal line is denoted as R2, a diagonal field of view of the image sensor is denoted as FOV, and Among them, mathematical formula 1 is satisfied: 90°-(3 / 4*FOV)≤R1≤90°-(1 / 2*FOV).

2. The camera module according to claim 1, wherein: Satisfies mathematical formula 2: 90°-(3 / 4*FOV)≤R2≤90°-(1 / 2*FOV).

3. The camera module according to claim 2, wherein: The second angle is equal to or greater than the first angle.

4. The camera module according to any one of claims 1 to 3, wherein: Satisfies Mathematical Formula 3: 40 degrees ≤ FOV ≤ 50 degrees.

5. The camera module according to any one of claims 1 to 4, wherein: An object-side surface of a first lens closest to the object among the plurality of lenses has a convex shape on the optical axis, The upper end of the first inclined surface is arranged above a horizontal straight line passing through the center of the object-side surface of the first lens, and the lower end of the first inclined surface is arranged below the horizontal straight line passing through the center of the object-side surface of the first lens.

6. The camera module according to claim 5, wherein: The height of the head is represented by D1, and the height of the lens holder is the height from the lower surface of the head to the lower end of the lens holder and is represented by D2, satisfying Conditional Formula 1: 1<D2 / D1<3.

7. The camera module according to claim 6, wherein: 1 / 2 of the maximum diameter of the head is expressed as D4, and 1 / 2 of the maximum diameter of the lens holder is expressed as D5, satisfying the conditional expression 2: 1<D4 / D5<3.

8. The camera module according to claim 7, wherein: Conditional formula 3 is satisfied: 1<(D4*2) / (D1+D2)<2.

9. The camera module according to claim 6, wherein: The maximum diameter of the head is denoted as B1, the diameter of the opening is denoted as B0, and Here, conditional formula 4 is satisfied: 0.1<B0 / B1<0.

6.

10. The camera module according to claim 5, wherein: The plurality of ribs are radially disposed on the upper edge of the opening, And an inner lower end of each of the plurality of ribs is spaced apart from an upper end of the opening.

11. A camera module, comprising: a head portion having a side wall portion, a receiving space within the side wall portion, and a plurality of ribs; a lens barrel having an opening communicating with the accommodation space of the head and having a lens holder vertically passing through the opening; a plurality of lenses aligned along an optical axis within the lens holder; a light-shielding film, the light-shielding film being arranged on the outer periphery between two adjacent lenses; a spacing member provided on the outer periphery and spacing adjacent plastic lenses among the plurality of lenses apart; an optical filter provided at a lower portion of the lens holder and on a sensor side of the last lens; a supporting member provided on an outer lower surface of the last lens and a periphery of the optical filter; as well as an image sensor configured to convert light incident through the plurality of lenses into an electrical signal, wherein each of the plurality of ribs is spaced apart from each other on an upper peripheral edge of the opening, wherein each of the plurality of ribs has a first inclined surface on the upper peripheral edge of the opening, The opening has a second inclined surface on its periphery, a first angle as an inner angle between the first inclined surface and a horizontal line is denoted as R1, a second angle as an inner angle between the second inclined surface and the horizontal line is denoted as R2, and a diagonal field of view of the image sensor is denoted as FOV, and Among them, mathematical formula 1 is satisfied: 90°-(3 / 4*FOV)≤R1≤90°-(1 / 2*FOV) and Mathematical formula 2: 90°-(3 / 4*FOV)≤R2≤90°-(1 / 2*FOV).

12. The camera module according to claim 11, wherein: The height of the head is represented by D1, the height of the lens holder, which is the height from the lower surface of the head to the lower end of the lens holder, is represented by D2, the optical axis distance from the center of the object-side surface of the first lens closest to the object among the plurality of lenses to the image sensor is represented by TTL, the number of the plurality of lenses is nL, Among them, the condition 1 is satisfied: 4<(nL*D1*D2) / TTL<8, where nL is 3 to 5, Wherein, 1 / 2 of the maximum diameter of the head is represented as D4, and Among them, conditional expression 2 is satisfied: D4≤TTL.

13. The camera module according to claim 11, wherein: The inner side of the spacer member has a third inclined surface, and an outer angle of the third inclined surface relative to a horizontal straight line is denoted as R4, an inner angle of a straight line passing through an end of an effective area of a sensor-side surface of a lens provided on the object side of the spacer member and an end of an effective area of the object-side surface of the lens provided on the sensor side is denoted as R3, and At least two of the following conditions are met: Conditional formula 3: FOV < R3; Conditional 4: R4 ≤ FOV; and Conditional expression 5: 54 degrees < R3 < 90 degrees.

14. The camera module according to claim 13, wherein: An object-side surface of a first lens closest to the object among the plurality of lenses has a convex shape on the optical axis, and The upper end of the first inclined surface is arranged above a horizontal straight line passing through the center of the object-side surface of the first lens, and the lower end of the first inclined surface is arranged below the horizontal straight line passing through the center of the object-side surface of the first lens.

15. The camera module according to claim 14, wherein: The height of the head is represented by D1, the height of the lens holder which is the height from the lower surface of the head to the lower end of the lens holder is represented by D2, 1 / 2 of the maximum diameter of the lens holder is represented by D5, the maximum diameter of the head is represented by B1, and the diameter of the opening is represented by B0, and At least two of the following conditions are met: Conditional formula 6: 1<D2 / D1<3; Conditional formula 7: 1<D4 / D5<3; Conditional formula 8: 1<(D4*2) / (D1+D2)<2; and Conditional formula 9: 0.1<B0 / B1<0.6.

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