KR20240062903A - Camera module and driving aid device - Google Patents

Abstract

A camera module disclosed in an embodiment of the invention includes a side wall portion and a head portion having a receiving space and a plurality of ribs within the side wall portion; and a lens barrel having an opening connected to the receiving space of the head part and a lens holder penetrating vertically through the opening. a lens unit having a plurality of lenses within the lens holder; and an image sensor that converts light incident through the plurality of lenses into an electrical signal, wherein each of the plurality of ribs is spaced apart from each other around an upper portion of the opening, and each of the plurality of ribs is positioned around an upper portion of the opening. It has a first inclined surface, the opening has a second inclined surface around the circumference, the first angle is R1, which is an interior angle between the first inclined surface and a horizontal straight line, and the second angle is an interior angle between the second inclined surface and a horizontal straight line. The angle is R2, the diagonal view angle of the image sensor is FOV, and Equation 1: R1 ≤ 90-(1/2*FOV) can be satisfied.

Description

Camera module and driving assistance device {CAMERA MODULE AND DRIVING AID DEVICE}

Embodiments of the invention relate to camera modules and driving assistance devices.

If the driver's attention is distracted due to drowsiness or inattention while driving, it inevitably leads to an accident. Accidents can occur due to drowsiness while driving, smoking, or failure to look ahead. Since the consequences of carelessness are too great to leave this situation to the individual driver's attention alone, various driving assistance devices are being developed.

There are several ways to recognize drowsy or inattentive driving. The most common method is to capture the driver with a camera and analyze the video, and use advanced driver assistance systems (ADAS) to receive lane departure information to detect inattentiveness. It also recognizes the situation.

ADAS (Advanced Driving Assistance System) is an advanced driver assistance system to assist the driver in driving. It senses the situation ahead, judges the situation based on the sensed results, and controls the vehicle's behavior based on the situation judgment. It consists of For example, ADAS detects vehicles ahead and recognizes lanes. Afterwards, once the target lane, target speed, and target ahead are determined, the vehicle's ESC (Electrical Stability Control), EMS (Engine Management System), and MDPS (Motor Driven Power Steering) are controlled. Typically, ADAS can be implemented as an automatic parking system, a low-speed city driving assistance system, and a blind spot warning system.

Sensor devices for sensing the situation ahead in ADAS include GPS sensors, laser scanners, front radar, and Lidar, but the most representative one is the front camera for filming the front of the vehicle.

Recently, research on detection systems that detect the surroundings of the driver or vehicle has been accelerating for driver safety and convenience. The vehicle detection system monitors the driver's situation or condition, detects objects around the vehicle, helps prevent collisions with objects that the driver does not recognize, and is used for a variety of purposes, including automatic parking. It provides the most essential data for automatic control.

Automotive camera modules are used in cars as built-in front, interior, and rear surveillance cameras and black boxes, and take photos or videos of surrounding subjects or drivers. The shooting quality of these vehicle camera modules may deteriorate due to moisture and temperature, and there is a problem in that optical characteristics change depending on the surrounding temperature and the material of the lens.

Embodiments of the invention may provide a camera module for driving assistance.

Embodiments of the invention can provide a camera module that can alleviate changes in shape and optical properties depending on temperature.

Embodiments of the invention can provide a camera module that can alleviate optical characteristics due to temperature changes in areas between a lens barrel and optical lenses, between optical lenses and a spacer, and between an optical lens and a spacer.

Embodiments of the invention can provide a portable terminal with a camera module and a driving assistance device for a moving object such as a vehicle.

A camera module according to an embodiment of the invention includes a side wall portion and a head portion having a receiving space and a plurality of ribs within the side wall portion; and a lens barrel having an opening connected to the receiving space of the head part and a lens holder penetrating vertically through the opening. a lens unit having a plurality of lenses within the lens holder; and an image sensor that converts light incident through the plurality of lenses into an electrical signal, wherein each of the plurality of ribs is spaced apart from each other around an upper portion of the opening, and each of the plurality of ribs is positioned around an upper portion of the opening. It has a first inclined surface, the opening has a second inclined surface around the circumference, the first angle is R1, which is an interior angle between the first inclined surface and a horizontal straight line, and the second angle is an interior angle between the second inclined surface and a horizontal straight line. The angle is R2, the diagonal view angle of the image sensor is FOV, and Equation 1: R1 ≤ 90-(1/2*FOV) can be satisfied.

According to an embodiment of the invention, Equation 2: R2 ≤ 90-(1/2*FOV) can be satisfied.

According to an embodiment of the invention, the second angle may be greater than or equal to the first angle.

According to an embodiment of the invention, Equation 3: 40 degrees ≤ FOV ≤ 50 degrees can be satisfied.

According to an embodiment of the invention, the first lens closest to the object among the plurality of lenses has an object-side surface convex on the optical axis, and the top of the first inclined surface passes through the center of the object-side surface of the first lens. It is disposed above a horizontal straight line, and the lower end of the first inclined surface may be disposed below a horizontal straight line passing through the center of the object-side surface of the first lens.

According to an embodiment of the invention, the height of the head part is D1, and the height of the lens holder is D2, which is the height from the lower surface of the head part to the bottom of the lens holder, and condition 1: 1 < D2/D1 < 3 can be satisfied. .

According to an embodiment of the invention, 1/2 of the maximum diameter of the head part is D4, 1/2 of the maximum diameter of the lens holder is D5, and condition 2: 1 < D4/D5 < 3 can be satisfied.

According to an embodiment of the invention, condition 3: 1 < (D4*2)/(D1+D2) < 2 can be satisfied.

According to an embodiment of the invention, the maximum diameter of the head part is B1, the diameter of the opening part is B0, and condition 4: 0.1 < B0/B1 < 0.6 can be satisfied.

According to an embodiment of the invention, the plurality of ribs are radially disposed around the upper portion of the opening, and an inner lower end of each of the plurality of ribs may be spaced apart from the upper end of the opening.

A camera module according to an embodiment of the invention includes a side wall portion and a head portion having a receiving space and a plurality of ribs within the side wall portion; and a lens barrel having an opening connected to the receiving space of the head part and a lens holder penetrating vertically through the opening. a plurality of lenses aligned along an optical axis within the lens holder; A light shield disposed on the outer perimeter between two adjacent lenses; a spacing member disposed on the outer periphery to space a gap between adjacent plastic lenses among the plurality of lenses; an optical filter disposed below the lens holder and on the sensor side of the last lens; a support member disposed around the outer lower surface of the last lens and the optical filter; and an image sensor that converts light incident through the plurality of lenses into an electrical signal, wherein each of the plurality of ribs is spaced apart from each other around an upper portion of the opening, and each of the plurality of ribs is provided around an upper portion of the opening. It has one inclined plane, and the opening has a second inclined plane around the circumference. The first angle, which is an interior angle between the first inclined plane and a horizontal straight line, is R1, and the second angle is an interior angle between the second inclined plane and a horizontal straight line. is R2, and the diagonal view angle of the image sensor is FOV, and can satisfy Equation 1: R1 ≤ 90-(1/2*FOV) and R2 ≤ 90-(1/2*FOV).

According to an embodiment of the invention, the height of the head part is D1, the height of the lens holder is D2, which is the height from the lower surface of the head part to the bottom of the lens holder, and the object of the first lens among the plurality of lenses is closest to the object. The optical axis distance from the center of the side to the image sensor is TTL, the number of lenses is nL, Condition 1: 4 < (nL*D1*D2)/TTL < 8, and nL includes 3 to 5. You can.

According to an embodiment of the invention, 1/2 of the maximum diameter of the head portion is D4, and condition 2: D4 ≤ TTL can be satisfied.

According to an embodiment of the invention, the inside of the spacing member has a third inclined surface, the outer angle of the third inclined surface with respect to the horizontal straight line is R4, and the sensor side surface of the lens disposed on the object side of the spacing member The inner angle of the straight line passing through the end of the effective area and the end of the effective area on the object side of the lens placed on the sensor side is R3, and Condition 3: FOV < R3, Condition 4: R4 ≤ FOV can be satisfied.

According to an embodiment of the invention, condition 5: 54 degrees < R3 < 90 degrees can be satisfied.

According to an embodiment of the invention, the first lens closest to the object among the plurality of lenses has an object-side surface convex on the optical axis, and the top of the first inclined surface passes through the center of the object-side surface of the first lens. It is disposed above a horizontal straight line, and the lower end of the first inclined surface may be disposed below a horizontal straight line passing through the center of the object-side surface of the first lens.

According to an embodiment of the invention, the height of the head portion is D1, the height of the lens holder is D2, which is the height from the lower surface of the head portion to the bottom of the lens holder, and 1/2 of the maximum diameter of the lens holder is D5, Condition 6: 1 < D2/D1 < 3, Condition 7: 1 < D4/D5 < 3 can be satisfied.

According to an embodiment of the invention, Condition 8: 1 < (D4*2)/(D1+D2) < 2 is satisfied, the maximum diameter of the head part is B1, the diameter of the opening is B0, and Condition 9: 0.1 < B0/B1 < 0.6 can be satisfied.

In another driving assistance device according to an embodiment of the invention, the camera module disclosed above may include an infrared camera module.

According to an embodiment of the invention, the reliability of the camera module can be improved by providing a camera module having at least one lens and/or a lens barrel that can alleviate changes in optical properties due to temperature changes.

According to an embodiment of the invention, a camera module having a lens barrel and/or a spacer that can alleviate physical changes due to temperature changes is provided, thereby improving the reliability of the camera module.

According to an embodiment of the invention, thermal deformation can be suppressed by adjusting the contact position and/or contact area for a plastic lens, thereby improving the reliability of the camera module.

According to an embodiment of the invention, the light path and light quantity can be controlled by controlling the spacing between lenses in the camera module using a spacer or/and a spacing member.

According to an embodiment of the invention, the optical reliability of a camera module can be improved and the reliability of a vehicle camera device having a camera module can be improved.

1 is a plan view of a camera module according to an embodiment of the invention.
FIG. 2 is an example of a cross-sectional view on the AA side of the camera module of FIG. 1.
FIG. 3 is an example of a cross-sectional view of the BB side of the camera module of FIG. 1.
Figure 4 is an example in which a housing is coupled around the lens barrel of Figure 2.
FIG. 5 is a partial diagram showing the combination of the lens barrel and lenses of the camera module of FIG. 2 and the optical path.
FIG. 6 is an enlarged view illustrating the spacer and peripheral lenses in the camera module of FIG. 2.
FIG. 7 is an enlarged view illustrating the support member and peripheral lenses in the camera module of FIG. 2.
Figure 8 is a graph comparing MTF (Modulation Transfer Function) characteristics of camera modules according to comparative examples and embodiments of the invention.
9 is an example of a vehicle having a camera module according to an embodiment of the invention.
FIG. 10 is a diagram explaining the driving assistance device inside the vehicle of FIG. 9.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The technical idea of the present invention is not limited to some of the described embodiments, but can be implemented in various different forms, and one or more of the components between the embodiments can be selectively combined as long as it is within the scope of the technical idea of the present invention. , can be used as a replacement. In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as "at least one (or more than one) of A and B and C", it is combined with A, B, and C. It can contain one or more of all possible combinations. Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the essence, order, or order of the component is not determined by the term. And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also is connected to the other component. It may also include cases where other components are 'connected', 'coupled', or 'connected' by another component between them. Additionally, when described as being formed or disposed "above" or "below" each component, "above" or "below" refers not only to cases where two components are in direct contact with each other, but also to one This also includes cases where another component described above is formed or placed between two components. In addition, when expressed as "top (above) or bottom (bottom)", it can include not only the upward direction but also the downward direction based on one component. Additionally, several embodiments described below can be combined with each other, unless specifically stated that they cannot be combined with each other. Additionally, unless specifically mentioned, parts omitted in the description of one of several embodiments may be applied to the description of other embodiments.

In the description of the 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 a lens adjacent to the image sensor. Unless otherwise specified in the description of the invention, the units for lens radius, thickness/distance, TTL, etc. are all mm. In this specification, the shape of the lens is expressed based on the optical axis of the lens. For example, saying that the object side of the lens is convex or concave means that the object side of the lens is convex or concave around the optical axis, but does not mean that the area around the optical axis is convex or concave. Therefore, even if the object side of the lens is described as convex, the portion around the optical axis on the object side of the lens may be concave or the opposite shape. In this specification, it should be noted that the thickness and radius of curvature of the lens are measured based on the optical axis of the lens. In other words, a convex lens surface means that the lens surface in the area corresponding to the optical axis has a convex shape, and a concave lens surface means that the lens surface in the area corresponding to the optical axis has a concave shape. can do. Additionally, “object side surface” may refer to the surface of the lens facing the object side based on the optical axis, and “sensor side surface” may refer to the surface of the lens facing the sensor side based on the optical axis.

Figure 1 is a plan view of a camera module according to an embodiment of the invention, Figure 2 is an example of a cross-sectional view on the A-A side of the camera module of Figure 1, Figure 3 is an example of a cross-sectional view on the B-B side of the camera module of Figure 1, and Figure 4 is an example. This is an example of a housing being coupled around the lens barrel of Figure 2, Figure 5 is a partial diagram showing the combination of the lens barrel and lenses of the camera module of Figure 2 and the optical path, and Figure 6 is a separation member in the camera module of Figure 2. is an enlarged view explaining the and peripheral lenses, and FIG. 7 is an enlarged view explaining the support member and peripheral lenses in the camera module of FIG. 2.

1 to 3, a camera module 1000 according to an embodiment of the invention includes a lens barrel 500, a lens unit 100 having a plurality of lenses, and members 121, 123, and 124 that maintain the distance between adjacent lenses. ), and may include a support member 125. At least one of the members 121, 123, and 124 maintaining the gap may be a spacer or a light shielding film, and the other may be a spacer.

The camera module 1000 may include a main board 190 and an image sensor 192 disposed 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 between the last lens of the lens unit 100 and the image sensor 192. The lens unit 100 can be defined as an optical system.

The lens unit 100 may be coupled to the inside of the lens barrel 500. The lens unit 100 may be an optical system in which three or more or five or more lenses are stacked. The lens unit 100 may include three or more or five or more solid lenses.

The lens unit 100 may include at least one lens made of plastic, or may include at least one lens made of glass and a lens made of plastic. In the lens unit 100 according to an embodiment of the invention, there may be more plastic lenses than glass lenses, or there may be two or more lenses. Here, the lens unit 100 may be laminated with plastic lenses or/and glass lens(s). Here, the coefficient of thermal expansion (CTE) of the plastic material is more than 5 times higher than that of the glass material, and the change value of the refractive index as a function of temperature can be more than 10 times higher for the plastic material than for the glass material.

The lens unit 100 may have a first lens 111, a second lens 113, and a third lens 115 aligned along the optical axis OA from the object side toward the image sensor 192. The second lens 113 may be disposed between the first lens 111 and the third lens 115. The third lens 115 may be disposed between the second lens 113 and the optical filter 196. As another example, a front lens may be further disposed on the object side of the first lens 111, or another lens may be further disposed between the first and second lenses 111 and 113 or between the second and third lenses 113 and 115. there is.

The lenses 111, 113, and 115 of the lens unit 100 are coupled to the opening 101 in the lens barrel 500, and may be coupled, for example, from the sensor side toward the object side. Accordingly, the opening area 101 on the object side of the first lens 111 closest to the object may 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 toward the object side and the sensor side. Hereinafter, the lenses 111, 113, and 115 within the opening 101 of the lens barrel 500 will be described as an example in which the lenses 111, 113, and 115 are coupled toward an object at the sensor side.

2 and 3, the opening 101 of the lens barrel 500 may penetrate from top to bottom. The opening 101 may have a minimum diameter B0 around the object-side surface S1 of the first lens 101 closest to the object. The opening 101 is a bottomless area and may have a maximum diameter at the lower opening area 102.

The lens barrel 500 may include a head portion 550 and a lens holder 510. The head portion 550 and the lens holder 510 may be formed integrally.

The head portion 550 has an accommodating space 551 therein, and may be connected to the opening 101 of the lens holder 510 at the center of the accommodating space 551. The inner diameter of the receiving space 551 may be more than 2 times the minimum diameter B0 of the opening 101, for example, more than 2 times but less than 4 times. The inner diameter of the receiving space 551 may be greater than 1 time, for example, greater than 1 time but less than 2 times the lower diameter of the opening 101. By providing the inner diameter of the receiving space 551 within the above range, it can be easily coupled with the external frame coupled with the lens barrel 500, that is, the upper housing.

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 receiving space 551 of the head 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 receiving space 551 may have a concave center so as to be connected to 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.

The receiving space 551 of the head portion 550 includes a plurality of ribs 555, and the ribs 555 may extend from the optical axis to the outer peripheral surface. Adjacent ribs 555 may be spaced apart from each other at the same angle relative to the optical axis 0A, for example, in the range of 40 degrees to 180 degrees or 50 degrees to 120 degrees, preferably in the range of 50 degrees to 75 degrees. there is. The plurality of ribs 555 are spaced apart from each other within the receiving space 551 and may be arranged in the range of 2 to 8 or 5 to 7 along the circumferential direction.

The plurality of ribs 555 may be arranged radially around the opening 101. Accordingly, a decrease in the rigidity of the head portion 550 can be prevented by the plurality of ribs 555.

The head unit 550 may be coupled to another transfer device. This head part 550 has a bottom part 553 and a side wall part 554, and the bottom part 553 includes a bottom S12 of the receiving space 551 and a lower surface S15 on the opposite side. You can. The side wall portion 554 may include a side surface S11 of the accommodation space 551 and an outer surface opposite thereto. The side wall portion 554 may be bent vertically or in the direction of the optical axis from the end of the bottom portion 553.

2 and 3, the height D1 of the head portion 550 is the height of the outer surface of the side wall portion 554 and may be smaller than the height D2 of the lens holder 510. The sum of the height D1 of the head portion 550 and the height D2 of the lens holder 510 may be the height or thickness of the lens barrel 500.

The height D1 of the head portion 550 and the height D2 of the lens holder 510 may satisfy Condition 1 below.

Condition 1: 1 < D2/D1 < 3

Condition 1 can be provided in a range that facilitates pickup of the camera module 1000 by a transfer device by having the head portion 550 protrude to the height D1. Preferably, 2mm ≤ D1 ≤ 3mm may be satisfied.

Condition 2: 1 < D3/D2 < 2

In condition 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 condition 2, it is possible to prevent a decrease in the amount of light incident on the object-side surface (S1) of the first lens 111, and to reduce the total length of the optical system, that is, the total top length (TTL). You can set it. The values of D2 and D3 may vary depending on 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, it is in the range of 3mm < D2 < 6.5mm, and may be in the range of 3.3mm < D3 <6.8mm.

Here, the height D2 of the head portion 550 is the height for the active align process of the camera module 1000, and can be adjusted to compensate for optical changes in the BFL through thermal compensation design. , for example, can be determined based on the coefficient of thermal expansion (CTE) of the lens material, the effective diameter of the lens, and the amount of compensation for the size of the temperature change of the lens. As another example, a camera module with an optical system with a small TTL or an optical system in which heat compensation is considered may satisfy D3 < D2 < TTL.

Condition 3: 1 < D4/D5 < 3

In Condition 3, D4 is the distance from the optical axis OA to the outer surface of the head 550 in a direction perpendicular to the optical axis OA, and is 1/2 of the diameter B1 of the head 550. D5 is 1/2 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 Condition 3 above, the work of the transfer device can be easy, an area for adhering the adhesive 650 to the lower surface S15 of the bottom 553 can be secured, and the camera Module assembly problems can be improved. Preferably, 1 < D4/D5 < 2 may be satisfied.

Condition 3-1: 1 < (D4*2)/(D1+D2) < 3

Condition 3-1 is that the diameter (D4*2) of the head portion 550 is placed larger than the height (D1+D2) of the lens barrel 500, so that the lens barrel 500 with a slim height can be provided. there is. Preferably, 1 < (D4*2)/(D1+D2) < 2 may be satisfied.

Condition 3-2: 1.5 < D4/D1 < 4

Condition 3-2 is that the radius D4 of the head part 550 is disposed within the above range than the height D1 of the head part 550, so that the operation of the transfer device through the head part 550 can be facilitated. . Preferably, 1 < (D4*2)/(D1+D2) < 2 may be satisfied.

Condition 4: 1 < D5/D6 < 3

In Condition 4, D6 is the horizontal distance between a straight line perpendicular to the outer surface of the head part 550 and the outer surface of the lens holder 510, and is the distance of the head part 550 based on the lower part of the lens barrel 500. It may be a protrusion length. This condition 4 limits the minimum protrusion length of the head portion 550 within the lens barrel 500 to the above range, thereby securing an area for adhering the adhesive 650 through the lower surface (S15) of the bottom portion 553. can do. Preferably, 1.5 < D5/D6 < 2.5 may be satisfied, and 1.5 mm ≤ D6 ≤ 3 mm may be satisfied. Additionally, D6 < D5 < D4 can be satisfied.

Condition 5: D6 ≤ D7

In condition 5, D7 is the distance from the upper outer surface of the lens holder 510 to the outer surface of the head portion 550, and is the distance from the outer surface of the head portion 550 to the upper outer surface of the lens holder 510. is the maximum depth. Here, when the depths D7 and D6 of the upper and lower outer surfaces of the lens holder 510 are the same, the upper and lower outer surfaces of the lens holder 510 can be injection molded into vertical surfaces, making processing easy. can do. Additionally, in the case of D6 < D7, in the case of the injection shape of the lens barrel 500, the lens barrel can be applied to a pyramid-type optical system for dimensional stability and uniformity of barrel thickness. Additionally, when the lens barrel is injected, the mold is required to have a shape that can be separated from the top/bottom/left/right, so D6 ≤ D7 or D6 < D7 can be satisfied.

Condition 6: 0.1 < B0/B1 < 0.6

In condition 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 within the head 550 can be set. there is.

The ribs 555 may be connected to the bottom portion 553 and the side wall portion 554. Each of the plurality of ribs 555 protrudes from the bottom 553 of the receiving space 551 in the optical axis direction and may have the same height. The thickness of the ribs 555 may be the width in the circumferential direction and may be the same. Each of the ribs 555 may have different lengths extending outward from the optical axis depending on the area. For example, the upper length of each rib 555 may be smaller than the lower length. The lower length is the lower end of each rib 555 extending from the side S11 of the side wall 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 receiving space 551 may be provided as a coupling space of a space transport device capable of effectively receiving incident light, and may be provided from the top of the opening 101 to the side S11 of the side wall 555. The straight line distance is a partial width B4 of the floor S12. Here, the lower length B2 of each rib 555 may be smaller than the partial width B4 of the bottom S12. That is, the inner lower end of each rib 555 may be spaced apart from the upper end of the opening 101. Accordingly, interference of incident light around the top of the opening 101 can be blocked or light loss around the top of the opening 101 can be reduced.

The upper periphery of the opening 101 may include a stepped portion S22a from the bottom S12 of the receiving space 551, and the stepped portion S22a may be provided in a ring shape. This stepped portion (S22a) can prevent the problem of burrs occurring during injection molding.

Each rib 555 may include an upper surface S20, a first inclined surface S21, and a recess 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 side wall portion 553. The first inclined surface S21 may be inclined from the upper surface S20 toward the opening 101. Edge portions of at least one or both of the upper surface S20 and the second inclined surface S21, which are the boundary portions with both sides of each rib 555, may be treated as curved surfaces, thereby eliminating the problem of defects caused by injection molding. It can be prevented.

The internal angle between a straight line extending along the first inclined surface S21 and a straight line (horizontal straight line) perpendicular to the optical axis OA may be the first angle R1. The first angle R1 may be 50 degrees or more, for example, in the range of 50 degrees to 65 degrees. Preferably, the first angle R1 may be in the range of 55 degrees to 60 degrees. The first angle R1 of the first inclined surface S21 may be an angle for interference with the opening 101 or the effective field of view (FOV) of the entrance pupil, and if it is smaller than the above range, the rigidity is reduced or Pickup may not be easy, and if it is larger than the above range, it may interfere with the range of the effective angle of view.

The inner surface of the opening 101 may have a second inclined surface S13. The internal angle between the second inclined surface S13 and a horizontal straight line is the second angle R2, that is, the second angle R2 is from the bottom of the receiving space 551 to the bottom of the second inclined surface S13. It can be slanted. The second angle R2 may be 65 degrees or less, for example, in the range of 50 degrees to 65 degrees. Preferably, the second angle R2 may be in the range of 55 degrees to 60 degrees. The second angle R2 may be an angle to prevent interference with the effective field of view (FOV) of the opening 101 or the entrance pupil. If it is smaller than the above range, unnecessary light may enter, and If it is larger than the range, there is a problem affecting the effective angle of view.

The second angle R2 of the second inclined surface S13 is the angle between a straight line passing between the top F2 and the bottom F1 of the second inclined surface S13 and a horizontal straight line, and the first lens 111 ) may extend to the periphery of the end of the effective area of the first surface S1 on the object side.

The top F2 of the second inclined surface S13 may be located above a straight line perpendicular to the center of the object-side first surface S1 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 object-side first surface S1 of the first lens 111. The second inclined surface S13 is disposed around the effective area of the object-side first surface S1 of the first lens 111 and may function as an upper aperture.

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 is located on the object side of the first lens 111. It may face the outer surface (S1a) disposed between the first surface (S1) and the first flange portion (111A) of the first lens 111. The upper inner surface (S14) of the lens holder 510 may be disposed to be inclined outward for insertion of the upper portion of the first lens 111, that is, the protrusion. That is, the upper inner surface (S14) of the lens holder 510 may have a gradually wider diameter as it moves from the object to the sensor, and the minimum diameter may be larger than the upper diameter (B0) of the opening 101. The upper diameter C11 of the first lens 111 may be larger than the upper diameter B0 of the opening 101, and if C11 < BO, the first surface of the first lens 111 ( Light traveling to the outer area S1a of S1) is reflected and focused on the image sensor 192 through the lenses, which may cause a ghost or flare.

The first angle (R1) and the second angle (R2) may be the same, and as another example, the first and second angles (R1, R2) may have a difference of 5 degrees or less or 3 degrees or less. . Additionally, the condition R1 ≤ R2 can be satisfied. That is, the second angle R2 of the second inclined surface S13 adjacent to the first lens 111 is equal to the first angle R1 of the first inclined surface S21 disposed on the object side compared to the opening 101. It can be big. Accordingly, the first and second inclined surfaces S21 and S13 may reduce interference of light traveling toward the opening 101 and may not affect the angle of view of the effective optical system.

The recess S22 may have a concave shape rather than a straight line extending along the first inclined surface S21. The inclination angle R1a of the surface of the recess S22 may be 65 degrees or more, for example, 65 degrees to 85 degrees or 70 degrees to 85 degrees. The inclination angle R1a of the surface of the recess S22 may be greater than the first angle R1 and the second angle R2. The lower end of the recess S22 may be connected to the bottom S12 of the receiving space 551 and may be spaced apart from the upper end F2 of the opening 101. Accordingly, when injection molding the ribs 555, a molding frame is provided up to the inner bottom of each rib 555, preventing defects in which the inner bottom of each rib 555 penetrates into the area of the opening 101. It can be prevented. Additionally, when molding the ribs 555, the injection mold can be easily separated.

The angle of view of the camera module 1000 is a diagonal view angle and can be defined as FOV or DFOV (Diagonal FOV). The diagonal angle of view is the angle of view of the entire optical system in the diagonal direction of the image sensor 192. The horizontal field of view (HFOV) of the camera module 1000 is the field of view of the entire optical system in the long axis direction of the image sensor 192, and the vertical field of view (VFOV: Vertical FOV) is the field of view of the entire optical system in the short axis direction of the image sensor 192. It is the angle of view of the optical system. The diagonal angle of view may be larger than the horizontal angle of view and the vertical angle of view.

Condition 1: 90°-(3/4*FOV) ≤ R1 ≤ 90°-(1/2*FOV)

Condition 2: 90°-(3/4*FOV) ≤ R2 ≤ 90°-(1/2*FOV)

Each of the first and second angles R1 and R2 may be greater than the angle of view (FOV) and less than 90 degrees, and preferably may be in the 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 is smaller than the largest diagonal view angle, thereby reducing loss of incident light. If the lower and upper limits of the first and second angles (R1, R2) of Conditions 1 and 2 are exceeded, the path of light incident at the effective angle of view within the lens barrel 510 may be interrupted or the amount of light may be reduced, and the rib The rigidity may decrease, the increase in the opening 101 may cause an increase in the inflow of foreign substances from the outside, and it may be difficult to control the amount of light.

In order to prevent the opening 101 of the lens holder 510 from interfering with the angle of view of the optical system, the following conditions can be satisfied.

Condition 1: 90°-(3/4*DFOV) ≤ R2 ≤ 90° - (DFOV*0.5)

Condition 2: R1 ≤ R2

DFOV is the angle of view in the diagonal direction of the image sensor, and may be 40 degrees or more, for example, 40 degrees to 60 degrees or 40 degrees to 50 degrees. Preferably, the first angle (R1) may be 62.5 degrees or less or in the range of 57.5 degrees ± 5 degrees, and the second angle (R2) may be 57.5 degrees ± 5 degrees. This camera module 1000 is a camera for a driving assistance device and can be provided as a camera for driver monitoring to prevent accidents due to the driver's drowsiness, smoking, or failure to look ahead while driving. Accordingly, the angle of view of the camera module 1000 is provided within the above range, so that the driver's condition and surrounding situations can be accurately sensed. The camera module 1000 can be applied to an infrared camera.

ImgH is 1/2 of the diagonal length of the image sensor. The first and second angles (R1, R2) may satisfy the following conditions.

Condition 3: ImgH*11 ≤ R1 ≤ ImgH*14

Condition 4: ImgH*11 ≤ R2 ≤ ImgH*14

Preferably, the first and second angles (R1, R2) may satisfy condition 1: ImgH*12 ≤ R1 ≤ ImgH*13.5 and/or condition 2: ImgH*12 ≤ R2 ≤ ImgH*13.5. By satisfying the above conditions according to the area of the image sensor 192, a decrease in the amount of light incident on the image sensor 192 can be prevented and the incident of unnecessary light can be blocked. In the specification, * indicates multiplication.

The lens holder 510 of the lens barrel 550 has different outer diameters, and even if thermal deformation occurs due to the internal lenses 111, 113, and 115, the material and outer diameter of the lens holder 510 and the materials of the lenses vary. Thus, thermal deformation of the lens(s) can be effectively suppressed.

The lens holder 510 has at least two or three lenses disclosed above therein, and may include, for example, first to third lenses 111, 113, and 115. The lens holder 510 has 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. It may be a barrel portion having. The sizes of the outer diameters may have a relationship of first outer diameter < second outer diameter < third outer diameter. The lens holder 510 may have a certain thickness on the outside of each lens 111, 113, and 115, and the thickness is a straight line distance from the inner surface of the contact side of each lens 111, 113, and 115 to the outer surface. Here, the inner diameter of the lens holder 510 is the inner diameter in contact with each lens 111, 113, and 115 as the first inner diameter inside the first outer diameter, the second inner diameter inside the second outer diameter, and the third inner diameter inside the third outer diameter. When distinguishing, the relationship of 1st inner diameter < 2nd inner diameter < 3rd inner diameter can be satisfied.

As shown in FIG. 4, a housing 600 may be coupled to the outer circumference of the lens holder 510. A portion of the housing 600 may be disposed between the outer circumference of the main board 190 and the lower side of the head portion 550. The housing 600 may support a space between the lower surface S15 of the head unit 550 and the main board 190. The housing 600 may be bonded to the lower surface (S15) of the head portion 550 using an adhesive 650.

The housing 600 protects the outside of the lens barrel 500 and the image sensor 192, blocks the inflow of foreign substances, and can be coupled to a moving object such as a vehicle. The housing 600 may be adhered to the upper surface of the main board 190 and to the coupling surface of the lens barrel 500, that is, the outer lower surface of the head portion 550 with adhesive 650. . The adhesive 650 may be made of a resin material such as epoxy or silicone.

Each of the lenses 111, 113, and 115 may include an effective area having an effective diameter through which light is incident, and an ineffective area outside the effective area. The flange portions 111A, 113A, and 115A of the lenses 111, 113, and 115 may be non-effective areas. The non-effective area may be an area where light is blocked by the first light-shielding film 121 and the second light-shielding film 123. The flange portions 111A, 113A, and 115A may extend in an effective area of the lenses 111, 113, and 115 in a direction perpendicular to the optical axis OA, in a radial direction, or in a circumferential direction.

A first light-shielding film 121 may be disposed on the outer circumference between the first lens 111 and the second lens 113, and the first light-shielding film 121 is a member that blocks light in the non-effective area. It can function and can be used as an aperture.

At least one of a spacing member 124 and a second light-shielding film 123 may be disposed on the outer periphery between the second lens 113 and the third lens 115. The spacing member 124 may have an internal hole and be formed in a ring shape.

The spacing member 124 may be disposed between the second light-shielding film 123 and the second lens 113. The spacing member 124 may be located 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 spacing member 124. Since the second lens 113 has a meniscus shape convex toward the sensor, the spacing member 124 is disposed around the outer periphery of the second lens 113, between the second and third lenses 113 and 115. It can maintain the outer spacing.

The spacing member 124 can maintain the outer gap between the second and third lenses 113 and 115. When there is no spacing member 124, the flange portions of the two lenses aligned in the optical axis direction may contact or may contact the second light shielding film 123. At least one or all of the first light-shielding film 121, the spacer 124, and the second light-shielding film 123 may function as a spacer to maintain the gap between the lenses 111, 113, and 115. The first light-shielding film 121, the spacer 124, and the second light-shielding film 123 control the amount and path of light using internal holes and can perform the function of blocking incident light.

The thickness of the first and second light-shielding films 121 and 124 may be thinner than the thickness T1 of the spacing member 124. Here, the aperture (stop) is made of the first light-shielding film 121, is disposed around the sensor-side second surface (S2) of the first lens 111, or is used as the sensor-side second surface (S2). You can.

A support member 125 may be disposed around the lower portion of the third lens 115, and the support member 125 may be press-fitted to prevent the third lens 115 from being separated from the bottom or may be connected to the optical filter 196. It can maintain spacing. Here, the support member 125 may be adhered to the inner surfaces of the optical filter 196 and the lens barrel 500 using an adhesive material 129.

The outer diameter of the lens barrel 500 is smallest at the outer circumference of the first lens 111, and may gradually increase toward the outer circumference 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.

Referring to FIG. 5, the camera module 1000 having the lens barrel 500 secures optical performance by adjusting the path of the first light L1 traveling to the end of the effective area of each lens 111, 113, and 115 of the optical system. can do.

The first lens 111 may have negative or positive power, and preferably, may have positive power. The first lens 111 is closest to the object, and on the optical axis OA, the object-side first surface S1 may have a convex shape, and the sensor-side second surface S2 may have a concave shape. As another example, on the optical axis OA, the object-side first surface S1 may have a concave shape, and the sensor-side second surface S2 may have a concave shape. As another example, on the optical axis OA, the object-side first surface S1 may have a convex shape, and the sensor-side second surface S2 may have a convex shape.

The first lens 111 may be made of glass. The first lens 111 may be provided as a spherical lens made of glass. As another example, the first lens 111 may be provided as an aspherical lens made of glass. As another example, the first lens 111 may be provided as an aspherical lens made of plastic.

When the first lens 111 is made of glass, discoloration due to the plastic material can be prevented when the camera module 1000 is exposed to light from inside or outside the vehicle, and deformation due to heat can be reduced. When the camera module 1000 is placed in a vehicle or is not exposed to the outside of the vehicle, the first lens 111 may be made of glass or plastic.

The first lens 111 may 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 may be smaller than the radius of curvature of the second surface (S2). The difference between the radius of curvature of the first surface S1 and the second surface S2 of the first lens 111 may be 1 mm or more, for example, in the range of 1 mm to 3 mm.

The central thickness of the first lens 111 may be the thickest among the lenses of the lens unit 100, for example, 1.2 mm or more. The effective diameter of the first surface (S1) of the first lens 111 may be larger than the effective diameter of the second surface (S2).

The first lens 111 may include a first flange portion 111A on the outside. A portion of the outer side of the first flange portion 111A may be in contact with the inner surface of the lens barrel 500.

The second lens 113 and the third lens 115 may have a different material from the first lens 111. The second lens 113 may have negative or positive power, and preferably, may have positive power. The second lens 113 may be made of glass or plastic, and is preferably made of plastic. The second lens 113 is disposed between the first lens 111 and the third lens 115, and may have a second flange portion 113A on the outside.

On the optical axis, the object-side third surface S3 of the second lens 113 may be concave, and the sensor-side fourth surface S4 may be convex. As another example, the object-side third surface S3 may be convex, and the sensor-side fourth surface S4 may be concave. As another example, the object-side third surface S3 may be convex, and the sensor-side fourth surface S4 may be convex. The third surface S3 and the fourth surface S4 may be aspherical on the optical axis.

A portion of the outer side of the second flange portion 113A of the second lens 113 may be in contact with the inner surface of the lens barrel 500.

The power of the third lens 115 may have the same sign as the power of at least one of the first lens 111 and the second lens 113. The third lens 115 may have negative or positive power, and preferably, may have positive power. When the first to third lenses 111, 113, and 115 have the same amount of power, the total optical axis length (TTL) can be reduced.

The third lens 115 may be made of glass or plastic, and is preferably made of plastic. The third lens 115 is disposed between the second lens 113 and the optical filter 196, and may have a third flange portion 115A on the outside. On the optical axis, the object-side fifth surface S5 of the third lens 115 may be convex, and the sensor-side sixth surface S6 may be concave. As another example, the object-side fifth surface S5 may be concave, and the sensor-side sixth surface S6 may be convex. As another example, the object-side fifth surface S5 may be concave, and the sensor-side sixth surface S6 may be concave. The fifth surface S5 and the sixth surface S6 may be aspherical on the optical axis.

A portion of the outer side of the third flange portion 115A of the third lens 115 may be in contact with the inner surface of the lens barrel 500.

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, in the range of 1.45 to 1.69. The difference in refractive index between the second lens 113 and the first lens 111 may be 0.2 or more. 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, in the range of 1.45 to 1.69. The difference in refractive index between the third lens 115 and the first lens 111 may be 0.2 or more.

When expressed as an absolute value, the radius of curvature of the third surface (S3) of the second lens 113 may be larger than the radius of curvature of the convex fourth surface (S4), for example, may be less than 7 mm or in the range of 5 mm to 7 mm. . The radius of curvature of the fourth surface S4 may be less than 5 mm in absolute value, for example, in the range of 2 mm to 4.99 mm. The difference between the radii of curvature of the third surface S3 and the fourth surface S4 of the second lens 113 may be 1 mm or more, for example, in the range of 1 mm to 4 mm.

When expressed as an absolute value, the radius of curvature of the fifth surface (S5) of the third lens 115 may be larger than the radius of curvature of the concave sixth surface (S6), for example, 1.1 mm or more or in the range of 1.1 mm to 3 mm. You can. The radius of curvature of the sixth surface S6 may be 2 mm or less in absolute value, for example, in the range of 1.1 mm to 2 mm. The difference between the curvature radii of the fifth surface S5 and the sixth surface S6 of the third lens 115 may be 1.3 mm or less.

When expressing an absolute value, the lens surface with the maximum radius of curvature may be the third surface (S3), and the lens surface with the minimum radius of curvature may be the sixth surface (S6). The absolute value of the maximum radius of curvature may be more than twice the minimum radius of curvature.

The central thickness of the second lens 113 may be the second thickest among the lenses of the lens unit 100, for example, thinner than the central thickness of the first lens 111, and the central thickness of the third lens 113. It can be thicker. The center spacing between the first lens 111 and the second lens 113 may be smaller than the thickness of the first lens 111 and may be larger than the center spacing between the second and third lenses 113 and 115. there is.

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 of the second surface (S2) and may be smaller than the effective diameter 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.

The second lens 113 is made of plastic or glass. If the second lens 113 is made of plastic, it has a higher coefficient of thermal expansion than glass, so greater thermal deformation may occur. In an embodiment of the invention, the second lens 113 is made of plastic, and when thermal deformation occurs due to a difference in the radius of curvature of the third surface (S3) and the fourth surface (S4), the second flange portion (113A) By lowering the load resulting from contact between the outer surface of the lens holder 510 and the inner surface of the lens holder 510, thermal deformation can be alleviated. That is, the contact area between the outer surface of the second flange portion 113A of the second lens 113 and the lens holder 510 is reduced and the contact position of the outer surface is located closer to the sensor side than the object side, The difference in curvature radii of the third and fourth surfaces (S3, S4) of the second lens 113 and the thermal deformation caused by the plastic material can be alleviated. Accordingly, the outer surface of the second lens 113 may have non-contact inclined surfaces at the top and bottom of the contact surface.

The outer surface of the third flange portion 115A of the third lens 115 may be in contact with 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 is 50% or less or in the range of 20% to 50% of the thickness of the third flange portion 115A. You can. Additionally, if the third lens 115 is made of plastic, the thermal expansion coefficient is higher than that of glass, so greater thermal deformation may occur. An embodiment of the invention is that when there is a difference in the radius of curvature of the fifth surface (S5) and the sixth surface (S6) of the third lens 115, the difference in the radius of curvature of the two surfaces (S5, S6) and the plastic material To minimize thermal deformation, the outer surface of the third flange portion 115A may be placed in contact with the inner surface of the lens holder 510 close to the sensor side, and may provide a non-contact area larger than the contact area.

The camera module 1000 according to an embodiment of the invention can block leaked light and control the light path and amount of light by means of members 121, 123, and 124 disposed around the outer circumference between the lenses 111, 113, and 115 to maintain the gap. At least one or all of the members 121, 123, and 124 that maintain the gap are made of plastic material and can expand or contract depending on the plastic lens. Accordingly, the members 121, 123, and 124 that maintain the gap can reduce thermal deformation of the plastic lens and reduce the problem of the optical axes of the lenses 111, 113, and 115 being misaligned.

Light incident on the lens unit 100 is refracted and transmitted along the effective areas of each lens 111, 113, and 115, and is transmitted to the image sensor 192 through the optical filter 196 and the cover glass 194. The image sensor 192 converts the incident light into an electrical signal. At this time, the members 121, 123, and 125 that maintain the gap may be disposed outside the boundary between the effective and non-effective areas of the two adjacent lenses 111, 113, and 115.

As members 121, 123, and 124 that maintain the gap, the first light-shielding film 121, the spacing member 124, and the second light-shielding film 123 block and absorb light that deviates from the optical path among the incident light, and the first light-shielding film (121), the amount of light passing through the hole of the spacer member 124 and the second light shielding film 123, and the hole of the support member 125 can be adjusted.

The first light shielding film 123 is disposed 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 optical axis direction. 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 in the range of 0.01 mm to 0.04 mm. The first light blocking film 121 has the above thickness and has a light absorption layer on the upper and/or lower surface, so that it absorbs light that deviates from the light path or takes an abnormal path.

The second light-shielding film 123 may be disposed 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 are made of plastic material and may include a light absorption layer. The second light-shielding film 123 may have a thickness of 0.1 mm or less, for example, in the range of 0.01 mm to 0.1 mm or in the range of 0.01 mm to 0.04 mm. The second light-shielding film 123 has the above-described thickness and has a light absorption layer on the upper and/or lower surface, so that it absorbs light that deviates from the light path or takes an abnormal path.

The first and second light films 121 and 123 may be made of the same material. The first and second light-shielding films 121 and 123 may include a PE film (Poly Ethylene film) or a polyester (PET)-based film. The first and second light films 121 and 124 have a multi-layer structure and may have the same stacked structure. The first and second light films 121 and 124 may have the same thickness. The first light-shielding film 121 is made of plastic material and may include a light absorption layer.

The spacing 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 the second flange portion 115A of the second lens 113 The third flange portion 115A of the third lens 115 may be spaced apart from the flange portion 113A at a predetermined interval. The spacing member 124 may include a poly ethylene film (PE film) or a polyester (PET) based film. As another example, at least one of the first and second light-shielding films 121 and 123 and the spacing member 124 may be made of a metal or alloy and an oxide film may be formed on its surface. Materials included in the metal or alloy include In, Ga, Zn, Sn, Al, Ca, Sr, Ba, W, U, Ni, Cu, Hg, Pb, Bi, Si, Ta, H, Fe, Co, It may include at least one of 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 oxidized material treated with black oxide or brown oxide using copper.

The image sensor 192 may be disposed on the main board 190. The image sensor 192 may be mounted, seated, contacted, fixed, temporarily fixed, supported, or coupled to the main board 190 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 in the main board 190, and in the embodiment, the image sensor 192 is connected to the main board 180. ) is not limited to a specific form placed in. The main board 190 may be a rigid PCB or FPCB.

The image sensor 192 may perform a function of converting light passing through the lens unit 100 into image data. A sensor module is disposed below the lens barrel 500 to surround the image sensor 192 and protect the image sensor 192 from external foreign substances or impacts. The image sensor 192 may be one of a Charge Coupled Device (CCD), Complementary Metal-Oxide Semiconductor (CMOS), CPD, or CID. When there are multiple image sensors 192, one may be a color (RGB) sensor and the other may be a black-and-white sensor.

The optical filter 196 may be disposed between the lens unit 100 and the image sensor 192. The optical filter 196 may filter light corresponding to a specific wavelength range for 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.

The cover glass 194 is disposed between the optical filter 196 and the image sensor 192, protects the upper part of the image sensor 192, and can prevent the reliability of the image sensor 192 from deteriorating.

The camera module 1000 according to an embodiment of the invention may include a driving member (not shown), which moves the barrel having at least one of the lenses in the optical axis direction or/and in a direction orthogonal to the optical axis direction. You can do it or tilt it. The camera module may include an Auto Focus (AF) function or/and an Optical Image Stabilizer (OIS) function. The camera module 1000 according to an embodiment of the invention may be applied to an infrared camera or a driver monitoring camera.

As shown in Figure 5, the ends (P1-P6) of the effective areas of each of the first to third lenses 111, 113, and 115 may have an effective radius based on the optical axis OA. The effective radius of the first surface (S1) of the first lens 111 is R11, the effective radius of the second surface (S2) is R12, and the first and third surfaces (S3, S4) of the second lens 113 ) can be defined as R21 and R22, the effective radius of the fifth surface S5 of the third lens 115 can be defined as R31, and the effective radius of the sixth surface S6 can be defined as R32.

In addition, with the surface of the image sensor 192 as a reference (R10), the distances in the optical axis direction to the ends of the effective areas of each of the first to sixth surfaces (S1) to S6 of each lens 111, 113, and 115 are H11, H12, and H21. , H22, H31, H32.

The inner end of the first light blocking film 121 may be disposed 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 blocking film 121 may be disposed closer to the second surface (S2) than to the third surface (S3).

Here, when the first light shielding film 121 functions as an aperture and the radius of the internal hole is ST_R0, the following conditions can be satisfied.

Condition 1: R11 < R12 < ST_RO

Condition 2: ST_R0 < R21 < R22 < R31 < R32

Due to this condition 1, the effective diameter from the object-side surface of the first lens 111 to the aperture gradually decreases, and the effective diameter from the aperture to the last lens surface gradually increases. By cutting the light traveling inside the optical system according to the position and inner diameter of the first light shielding film 121, the required optical performance, such as relative illuminance (RI) and F number of 2.2 or less, can be set.

The end P1 of the effective area of the first surface S1 of the first lens 111 may be disposed closest to the bottom F1 of the opening 101.

The optical axis distance between the ends (P1-P6) of the effective area of each lens surface (S1-S6) and the surface of the image sensor 192 may satisfy the following conditions.

Condition 1: 1 < H11/H12 < 1.5

Condition 2: 1.3 < H11/H21 < 1.7

Condition 3: 1 < H21/H22 < 1.5

Condition 4: 2 < H11/H31 < 3

Condition 5: 1.2 < H31/H32 < 1.6

Condition 6: (H12-H21) < (H22-H31)

The effective radius and edge thickness of the first to sixth surfaces (S1-S6) of the first, second, and third lenses (111, 113, and 115) can be set according to conditions 1, 3, and 5, so that the The path of the traveling first light L1 can be set.

According to conditions 2 and 4, the edge thickness of each lens and the edge spacing between adjacent lenses can be set from the end P1 of the effective area of the first surface S1 of the first lens 111.

The value of (H12-H21) of condition 6 can set the edge spacing of the first lens 111 and the second lens 113, and the value of (H22-H31) can set the edge spacing of the second lens 113 and the third lens 113. The edge spacing of (115) can be set. The thickness T1 (FIG. 6) of the spacing member 124 can be set according to condition 6.

Condition 7: (H22-H31) < T1

In condition 7, the thickness T1 of the spacing member 124 can be secured by the convex sensor side surface S4 of the second lens 113 and the chevron-shaped object side surface S6 of the third lens 115. there is. Preferably, 1 < T1/(H22-H31) < 1.5 may be satisfied.

The camera module according to the embodiment disclosed above may satisfy at least one or two of the equations described below. Accordingly, the camera module according to the embodiment may have improved optical characteristics. For example, if the camera module satisfies at least one mathematical equation, the camera module can alleviate thermal deformation of lenses, effectively control aberration characteristics such as chromatic aberration and distortion aberration, and can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and the center of the field of view (FOV). Good optical performance can be achieved even in the and peripheral areas. Additionally, the camera module 1000 may have improved resolution. In addition, the meaning of the thickness of the lens at the optical axis (OA) and the distance between the adjacent lenses at the optical axis (OA) described in the equations may refer to the embodiment disclosed above.

[Equation 1]

1 < CT1/CT2 <2

CT1 is the central thickness of the first lens 111, and CT2 is the central thickness of the second lens 113. If the camera module satisfies Equation 1, the aberration characteristics of the optical system can be improved.

[Equation 2]

2 < CT1/CT3 < 4

CT3 is the central thickness of the third lens 115. If the camera module satisfies Equation 2, the aberration characteristics of the optical system can be improved.

[Equation 3]

1 < CT1/CG1 < 2.5

CG1 is the center spacing between the first and second lenses. If the camera module satisfies Equation 3, the center thickness of the first lens 111 and the center distance between the first and second lenses can be set to provide good optical performance at the set angle of view and focal length, and TTL can be reduced.

[Equation 4]

2 < CT2/CG2 < 5

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

[Equation 5]

1.7 < n1

In Equation 5, n1 is the refractive index at the d-line of the first lens 111. When Equation 5 is satisfied, the first lens 111 can refract from the convex first surface S1 to the effective area of the second surface S2, which has the smallest effective diameter.

[Equation 6]

n3*v3 < n1*v1

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

[Equation 7]

L1R1 > 0

L1R1 is the radius of curvature at the optical axis of the object-side surface S1 of the first lens 111. If Equation 7 is satisfied, the amount of incident light on the first lens 111 can be increased.

[Equation 8]

L1R1 < L1R2

L1R2 is the radius of curvature at the optical axis of the sensor side surface (S2) of the first lens 111. If Equation 8 is satisfied, the inner hole size of the first light shielding film 121 can be reduced and the overall TTL can be reduced.

[Equation 9]

L1R2*CA12 < L1R1*CA11

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

[Equation 10]

1 < CA_Max/CA_Min < 3

CA_Max is the maximum effective diameter among the lens surfaces (S1-S6) of each lens, and CA_Min is the minimum effective diameter among the lens surfaces (S1-S6) of each lens. If Equation 10 is satisfied, the size of the camera module and the outer shape of the lens holder 510 can be set.

[Equation 11]

1 < CA11/CA12 < 3

If Equation 11 is satisfied, the path of light traveling to the aperture (Stop) can be adjusted by setting the effective diameter difference between the first and second surfaces (S1 and S2) of the first lens 111.

[Equation 12]

0.5 < CA11/CA32 < 1

CA32 is the effective diameter of the sixth surface S6 of the third lens 115. If Equation 12 is satisfied, the difference in effective diameter between the first surfaces (S1, S2) of the first lens 111 and the sensor side (S6) of the last lens is set, which affects performance changes according to CRA and temperature. Elements can be adjusted. Additionally, the sizes of the first and third lenses 111 and 115 can be adjusted.

[Equation 13]

2mm <ImgH

ImgH is half the diagonal size of the image sensor 192. If Equation 13 is satisfied, an optical system having the sensor size of a vehicle camera can be provided. Equation 52 preferably satisfies 2mm <ImgH<4mm.

[Equation 14]

1 < TTL/(ImgH*2) < 2

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 Equation 14 is satisfied, the length of the entire optical system can be set compared to the size of the image sensor.

[Equation 15]

0 < BFL/ImgH < 1

BFL is the optical axis distance from the center of the sensor side of the last lens to the surface of the image sensor. If Equation 15 is satisfied, installation space for the components 194 and 196 can be secured between the image sensor and the last lens, and space can be provided to guide light from the last lens toward the image sensor.

[Equation 16]

0 < CA_Max/(D1+D2) < 1

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

[Equation 17]

0 < TD/(D1+D2) < 1

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

[Equation 18]

0 < CA_Max/B1 < 0.5

B1 is the maximum effective diameter of the lens barrel and is the outer diameter of the head portion. If Equation 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 and assembly of the lens barrel.

[Equation 19]

1 < CA_Max/B0 < 1.5

B0 is the diameter of the opening 101 of the lens unit 100. If Equation 19 is satisfied, the path of incident light can be adjusted by setting the maximum effective diameter of the lenses and the size of the opening 101.

[Equation 20]

0.5 < CA11 / B0 < 1

If Equation 20 is satisfied, the size of the opening 101 and the effective diameter of the object-side surface of the first lens 111 can be set to block the inflow of light traveling through an unnecessary path.

[Equation 21]

0.3 < CA32/(D5*2) < 0.7

D5 is the straight line distance between the optical axis and the lower outer surface of the lens holder 510 and is the lower radius of the lens holder 510. If Equation 21 is satisfied, the last lens disposed in the lens holder 510 and the lower outer diameter of the lens holder 510 are set to the above range, making it easy to combine the last lens.

[Equation 22]

0.7 < D2/FD < 1.2

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 Equation 22 is satisfied, the height of the lens holder 510 can be set based on the optical axis distance from the first lens coupled within the lens holder 510 to the optical filter.

[Equation 23]

0.4 < CA_FD/(D5*2) < 0.9

CA_FD is the effective length of the optical filter and is the average of the effective lengths of the 7th surface on the object side and the 8th surface on the sensor side as shown in Table 1. If Equation 23 is satisfied, the optical filter and size with the maximum effective length within the lens holder 510 and the lower outer diameter of the lens holder 510 can be set.

[Equation 24]

0 < nGL < nPL

nGL is the number of glass lenses among the lenses, and nPL is the number of plastic lenses among the lenses. If Equation 24 is satisfied, thermal changes within the camera module can be alleviated, and plastic lenses can improve optical characteristics such as aberration and distortion.

[Equation 25]

4 < (nL*D1*D2)/TTL < 8

nL is the total number of lenses in the lens holder 510 and is 3 to 5. If Equation 25 is satisfied, the size of the camera module can be set compared to the overall TTL.

[Equation 26]

1 < Fno < nL

Fno is the F number of the optical system. If Equation 26 is satisfied, a bright optical system can be provided. Here, Fno can satisfy 2±0.2.

[Equation 27]

10 < ²∑?Index < 30

ΣAbbe refers to the sum of the Abbe numbers of each of the plurality of lenses. ΣIndex means the sum of the refractive indices of each of the plurality of lenses. When Equation 27 is satisfied, the optical system can have improved aberration characteristics and resolution. By setting the sum of the Abbe number and the refractive index of the lenses in Equation 27, optical characteristics can be controlled, and preferably 15 < ²∑?Index < 25.

[Equation 28]

40°≤ FOV ≤ 50°

FOV is the field of view of the optical system within the camera module, that is, the diagonal angle of view. Equation 28 shows that even if a mixture of glass lenses and plastic lenses is used in a camera module, deterioration of optical characteristics can be prevented through temperature compensation and aberration correction. Alternatively, Equation 28 can prevent deterioration of optical characteristics through temperature compensation and aberration correction even if a mixture of spherical lenses and aspherical lenses is used in the camera module.

[Equation 29]

TTL ≤ 9mm

In Equation 29, the size of the camera module can be reduced by setting the optical axis distance from the center of the first surface (S1) of the first lens 111 to the surface of the image sensor within the camera module. Preferably, D4 ≤ TTL can be satisfied.

Lens data of the first to third lenses 111 to 115 according to an embodiment of the invention are shown in Table 1.

lens noodle Radius of curvature (mm) Thickness/Gap (mm) refractive index Abesu Effective diameter (mm) first lens side 1 3.223 1.641 2.051 26.90 3.243 side 2
(Stop) 5.188 1.015 1.839 second lens side 3 -5.568 1.163 1.661 20.40 2.176 page 4 -3.430 0.339 2.917 third lens side 5 1.606 0.589 1.661 20.40 3.50 page 6 1.391 0.333 4.047 optical filter page 7 1.00E+18 0.300 1.513 54.50 4.169 page 8 1.00E+18 0.500 4.275 cover glass page 9 1.00E+18 0.4 1.513 54.50 4.548 page 10 1.00E+18 0.045 4.689 image
sensor 1.00E+18 0.00 4.529

Table 1 shows the items of the above-described equations in the camera module 1000 of the embodiment, including the radius of curvature of the lens surfaces of each lens, the center thickness of each lens, the center spacing between adjacent lenses, the refractive index of each lens, and Abbe. Number, indicates the effective radius of each lens surface. The values for each of the above items may have an error range of 0.5% or less.

Here, when the lens unit 100 is stacked by mixing plastic lenses and at least one glass lens, thermal deformation caused by the plastic lenses can be minimized. For example, by providing the relaxation structure of the second and third lenses 113 and 115 so that they can be compensated according to thermal deformation, diffraction ( Diffraction) The MTF change rate of optical performance can be provided at less than 10%. The high temperature may include the temperature inside or outside the vehicle.

In an embodiment of the invention, in order to alleviate thermal strain of the second and third lenses 113 and 115, the material of the lens barrel 500 may be a heat dissipating material, a material similar to that of a plastic lens, or a metal material. The material of the lens barrel 500 according to an embodiment of the invention may be a plastic material, for example, a plastic material having the same thermal expansion coefficient as a plastic lens or a plastic material of the same material. The head portion 550 of the lens barrel 500 may have a top view shape of a circular pillar or a polygonal pillar shape. A hydrophilic material may be coated or applied to the surface of the lens barrel 500. As another example, the lens barrel 500 may be selected from a metal material, such as Al, Ag, or Cu, or may be Al or an Al alloy. When the lens barrel 500 is made of metal, heat transmitted to the lateral direction of the lenses 111, 113, and 115 can be dissipated and thermal deformation of the lenses 111, 113, and 115 can be suppressed.

Referring to FIG. 6, the spacing member 124 may be disposed between the second lens 113 and the second light-shielding film 123, and may have a ring shape with an internal hole. The inner diameter K1 of the hole of the spacing member 124 may be larger than the inner diameter of the hole of the first light-shielding film 121 and may be smaller than the inner diameter of the hole of the second light-shielding film 123. The inner diameter of each hole may be the minimum diameter.

The spacing member 124 may be made of a material different from the light absorbing material of the first and second light shields 121 and 124. The spacing member 124 may be made of plastic or an injection moldable plastic material. The thickness T1 of the spacing member 124 may be thicker than the first and second light-shielding films 121 and 124. The thickness T1 of the spacing member 124 may be thicker than the sum of the thicknesses of the first and second light-shielding films 121 and 124.

If the thickness of the spacing member 124 is T1, and the central thickness of the second and third lenses 113 and 115 is CT2 and CT3, the condition: CT2 ≤ T1 < CT3 may be satisfied. The thickness T1 of the spacing member 124 may be 0.7 mm or more, for example, in the range of 0.7 mm to 1.1 mm, or in the range of 0.8 mm to 0.1 mm.

The spacing member 124 includes an inner end 124A protruding inward and a second recess 124B at the upper inner portion. The inner end 124A may 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 spacing member 124 is disposed with an inner side having an inclined surface, and the upper end of the inclined surface may be disposed closer to the optical axis OA than the lower end. The end (or the top of the inclined surface) of the inner end 124A of the spacing member 124 may correspond to or be disposed adjacent to the end P4 of the effective area of the fourth surface S4.

The third inclined surface SS1 of the inner end 124A of the spacing member 124 may overlap the end P5 of the effective area of the fifth surface S5 of the third lens 115 in the vertical direction. . That is, the third inclined surface SS1, which is the inclined inner surface of the spacing member 124, moves away from the optical axis OA from the top to the bottom, so that the end P4 of the effective area of the fourth surface S4 and the fifth The interference position of the first light L1 passing through the end P5 of the effective area of the surface S5 may deviate.

The third inclined surface SS1 of the inner end 124A of the spacing member 124 overlaps the second light shielding film 123 by more than 50% in the vertical direction, and thus is reflected by the third inclined surface SS1. The light may be absorbed by the second light blocking film 123 without traveling to the effective area of the lenses.

The spacing member 123 can block the occurrence of phenomena such as ghosts or flares caused by stray light. The position of the upper end of the inner end 124A of the spacing member 124 or the upper end of the third inclined surface SS1 is spaced apart from the optical axis OA at a first distance K1, and the first distance K1 is a first distance K1. 2 It may be larger than the effective radius (R22) of the lens 113. That is, R22 < K1 can be satisfied, and K1 ≥1.489mm. The position of the lower end of the inner end 124A of the spacing member 124 or the lower end of the inclined inner surface SS1 is spaced apart from the optical axis OA by a second distance K2, and the second distance K2 is a second distance K2. 3 It may be larger than the effective radius (R31) of the lens 115. That is, K1 < R31 < K2 can be satisfied, and K2 ≥1.695mm.

The outer angle of the third inclined surface SS1 of the spacing member 124 has a fourth angle R4 with respect to a horizontal straight line, and the effective area of the fourth surface S4 of the second lens 113 is The straight line passing through the end P4 and the end P5 of the effective area of the fifth surface S5 of the third lens 115 may have a third angle R3 as an interior angle with respect to a horizontal straight line.

The third and fourth angles (R3, R4) may satisfy R4 ≤ R3, and if this is satisfied, the first light (L1) can be prevented from being incident on the third inclined surface (SS1), and the third inclined surface ( The abnormal light incident on SS1) can be reflected and absorbed by the second light shielding film 123. Preferably, the condition: R4 < R3 or 1.5 < R3/R4 < 2.0 may be satisfied. That is, the fourth angle R4 may be smaller than or equal to the angle of the optical path of the first light L1 passing between the second and third lenses 113 and 115.

The third and fourth angles R3 and R4 may satisfy the following conditions compared to the angle of view (FOV).

Condition 1: FOV < R3

Condition 2: R4 ≤ FOV

Condition 3: 54 degrees < R3 < 90 degrees

When the fourth surface S4 of the second lens 113 has a convex shape based on the upper surface of the second light shielding film 123, the effective area of the second flange portion 113A and the fourth surface S4 The convex area S41 between the ends P4 may overlap the end 124A of the spacing member 124 in the vertical direction. At this time, the spacing member 124 is provided with a second recess 124B in an area corresponding to the convex area S41 in order to block contact with the convex area S41.

The depth T2 of the second recess 124B may be less than 50% of the thickness T1 of the spacing member 124. Condition: 0.1 < T2/T1 < 0.5 can be satisfied. Here, T2 is in the range of 0.35 mm ± 5% and may vary depending on the spherical or aspheric coefficient of the fourth surface S4.

The horizontal width W1 of the second recess 124B may satisfy the following conditions.

Condition 1: W1 ≤ (K2-K1)

The fourth angle R4 may satisfy the following conditions.

Condition 2: R4= arctan(T3/(K2-K1))

Due to these conditions, the spacing member 123 is disposed as much as possible along the path of the first light L1, thereby preventing the occurrence of phenomena such as ghosts or flares due to stray light on the image sensor 192. .

Referring to FIG. 7, the support member 125 is a lower ring or press-fit member and includes an inner portion 51, a third recess 125A at the upper inner portion, 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 the inclined inner surface It may slope from the top to the bottom. The inner portion 51 may overlap the non-effective area of the optical filter 196 in the vertical direction.

The inclined inner surface of the inner portion 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 portion 51.

The distance between the top of the inclined inner surface of the inner part 51 and the optical axis OA is K5, the distance between the bottom and the optical axis is K6, and from the optical axis OA to the end P7 of the effective area of the optical filter 196 The distance can be defined as K7.

Condition 1: K6 < K5

Condition 2: R32 ≤ K5

Condition 3: R32 < K7

Condition 4: K7 ≤ K6

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

The first light L1 passes 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, and at this time, the end The straight line connecting (P6, P7) may be inclined at a fifth angle (R5) with respect to the horizontal straight line.

The fifth and sixth angles R5 and R6 may satisfy R6 ≤ R5, and when this is satisfied, the first light L1 can be prevented from entering the inclined surface of the support member 125 and enters the inclined surface. It can absorb abnormal light. Preferably, the condition: R6 < R5 or 1 < R5/R6 < 1.5 may be satisfied. That is, the sixth angle R6 may be smaller than or equal to the angle of the optical path of the first light L1 passing between the third lens 115 and the periphery of the optical filter 196.

The fifth and sixth angles R5 and R6 may satisfy the following conditions compared to the field of view (FOV).

Condition 1: FOV < R5

Condition 2: FOV < R6

Condition 3: 54 degrees < R6 < 70 degrees

When the edge portion of the effective area of the sixth surface S6 of the third lens 115 has a convex shape based on the upper surface of the support member 125, the third flange portion 115A and the sixth surface ( The convex area between the ends P6 of the effective area (S6) may overlap the end 51 of the support member 125 in the vertical direction. At this time, the support member 125 is provided with a third recess 125A in an area corresponding to the convex area in order to block contact with the convex area.

The depth T5-T6 of the third recess 125A may be less than 50% of the thickness T5 of the support member 125. Condition: 0 < (T5-T6)/T5 < 0.2 can be satisfied. Here, the value of (T5-T6) is in the range of 0.1 mm ± 5% and may vary depending on the spherical or aspheric coefficient of the sixth surface S6.

The horizontal width W2 of the third recess 125A may satisfy the following conditions.

Condition 1: W2 ≥ (K6-K5)

The sixth angle R6 may satisfy the following conditions.

Condition 2: R6= arctan(T6/(K6-K5))

Due to these conditions, the support member 125 is disposed as much as possible along the path of the first light L1, thereby preventing the occurrence of phenomena such as ghosts or flares due to stray light on the image sensor 192. .

The lower surface 52 of the support member 125 is disposed on the non-effective area of the optical filter 196, and the lower protrusion 53 may be adhered to the adhesive material 129. The adhesive material 129 is filled in 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 serves to adhere them. You can.

Referring to Figures 8 (A) and (B), the MTF was measured while reducing the thickness of the first light blocking film 121, and the optimal focus position was optimized by reducing 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㎛ or more, for example, in the range of 20㎛ to 26㎛. Figure 8 (A) shows the MTF characteristics of the optical system when the first light-shielding film has a second thickness, and the second thickness is less than 20㎛, for example, in the range of 14㎛ to 18㎛. As shown in (A) (B) of Figure 8, it can be seen that gap differences (G1, G2) occur between the center and the peripheral area of the MTF graph of the optical system, and the first light-shielding film is connected to the first light-shielding film having the second thickness. By reducing the gap between the first and second lenses, the center position can improve peripheral resolution and minimize field curvature.

Figure 9 is an example of a top view of a vehicle to which a camera module according to an embodiment of the invention is applied.

Referring to FIG. 9, the vehicle camera system according to an embodiment of the invention includes an image generator 11, a first information generator 12, a second information generator 21, 22, 23, 24, and a control unit ( 14) Includes.

The image generator 11 may include at least one camera module 20 disposed in the host vehicle, and may generate a front image of the host vehicle or an image inside the vehicle by photographing the front of the host vehicle and/or the driver. You can.

Additionally, the image generator 11 may use the camera module 20 to generate an image of not only the front of the host vehicle but also the surroundings of the host vehicle or the driver in one or more directions.

Here, the front image and peripheral image may be digital images and may include color images, black-and-white images, and infrared images. Additionally, the front image and surrounding image may include still images and moving images. The image generator 11 provides the driver image, front image, and surrounding image to the control unit 14. Next, the first information generator 12 may include at least one radar or/and a camera disposed in the host vehicle, and generates first detection information by detecting the front of the host vehicle. Specifically, the first information generator 12 is disposed in the host vehicle and generates first detection information by detecting the location and speed of vehicles located in front of the host vehicle and the presence and location of pedestrians.

The first detection information generated by the first information generator 12 can be used to control the distance between the own vehicle and the vehicle in front to be kept constant, and when the driver wants to change the driving lane of the own vehicle or reverse parking. The stability of vehicle operation can be improved in certain preset cases, such as when driving. The first information generation unit 12 provides first detection information to the control unit 14.

Subsequently, the second information generation units 21, 22, 23, and 24 generate the front image generated by the image generating unit 11 and the first detection information generated by the first information generating unit 12, Each side of is sensed to generate second sensed information. Specifically, the second information generators 21, 22, 23, and 24 may include at least one radar or/and camera disposed on the host vehicle, and detect the positions and speeds of vehicles located on the sides of the host vehicle. Or you can shoot a video. Here, the second information generating units 21, 22, 23, and 24 may be disposed on both the front and rear sides of the host vehicle, respectively.

This vehicle camera system may be equipped with the following camera module, and provides or processes information acquired through the front, rear, each side, or corner area of the vehicle to the user to prevent autonomous driving or surrounding safety from vehicles and objects. can protect. As shown in FIG. 10, the camera module 2320 is spaced a predetermined distance d1 from the driver, captures the driver's situation and state, and provides the image to the vehicle management device to be applied as a driver monitoring system.

The optical system of the camera module according to an embodiment of the invention can be mounted in multiple numbers in a vehicle to improve safety regulations, strengthen autonomous driving functions, and increase convenience. Additionally, the optical system of the camera module is used in vehicles as a control component for lane keeping assistance systems (LKAS), lane departure warning systems (LDWS), and driver monitoring systems (DMS). These automotive camera modules can provide stable optical performance despite changes in ambient temperature and provide price-competitive modules to ensure the reliability of automotive components.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description has been made focusing on the examples, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiment. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

100: Lens part
111,113,115: Lens
111A, 113A, 115A: Flange part
121: First light curtain
123: absence of separation
124: Second light curtain
125: support member
190: main board
192: Image sensor
194: Cover glass
196: Optical filter
500: Lens barrel
1000: Camera module

Claims (19)

a head portion having a side wall portion and a receiving space within the side wall portion and a plurality of ribs; and a lens barrel having an opening connected to the receiving space of the head part and a lens holder penetrating vertically through the opening.
a lens unit having a plurality of lenses within the lens holder; and
It includes an image sensor that converts light incident through the plurality of lenses into an electrical signal,
Each of the plurality of ribs is spaced apart from each other around an upper portion of the opening,
Each of the plurality of ribs has a first inclined surface around an upper portion of the opening,
The opening has a second inclined surface around the circumference,
The first angle, which is an interior angle between the first inclined plane and a horizontal straight line, is R1,
The second angle, which is an interior angle between the second inclined plane and a horizontal straight line, is R2,
The diagonal view angle of the image sensor is FOV,
Equation 1: 90°-(3/4*FOV) ≤ R1 ≤ 90°-(1/2*FOV)
A camera module that satisfies the requirements. According to paragraph 1,
Equation 2: 90°-(3/4*FOV) ≤ R2 ≤ 90°-(1/2*FOV)
A camera module that satisfies the requirements. According to paragraph 2,
The second angle is a camera module greater than or equal to the first angle. According to any one of claims 1 to 3,
Equation 3: 40 degrees ≤ FOV ≤ 50 degrees
A camera module that satisfies the requirements. According to any one of claims 1 to 4,
Among the plurality of lenses, the first lens closest to the object has an object-side surface convex on the optical axis,
The top of the first inclined surface is disposed above a horizontal straight line passing through the center of the object-side surface of the first lens,
A camera module where the lower end of the first inclined surface is disposed below a horizontal straight line passing through the center of the object-side surface of the first lens. According to clause 5,
The height of the head portion is D1,
The height of the lens holder is D2, which is the height from the bottom of the head to the bottom of the lens holder,
Condition 1: 1 < D2/D1 < 3
A camera module that satisfies the requirements. According to clause 6,
1/2 of the maximum diameter of the head is D4,
1/2 of the maximum diameter of the lens holder is D5,
Condition 2: 1 < D4/D5 < 3
A camera module that satisfies the requirements. In clause 7,
Condition 3: 1 < (D4*2)/(D1+D2) < 2
A camera module that satisfies the requirements. According to clause 6,
The maximum diameter of the head part is B1,
The diameter of the opening is B0,
Condition 4: 0.1 < B0/B1 < 0.6
A camera module that satisfies the requirements. According to clause 5,
The plurality of ribs are radially disposed around the upper portion of the opening,
A camera module wherein an inner lower end of each of the plurality of ribs is spaced apart from an upper end of the opening. a head portion having a side wall portion and a receiving space within the side wall portion and a plurality of ribs; and a lens barrel having an opening connected to the receiving space of the head part and a lens holder penetrating vertically through the opening.
a plurality of lenses aligned along an optical axis within the lens holder;
A light shield disposed on the outer perimeter between two adjacent lenses;
a spacing member disposed on the outer periphery to space a gap between adjacent plastic lenses among the plurality of lenses;
an optical filter disposed below the lens holder and on the sensor side of the last lens;
a support member disposed around the outer lower surface of the last lens and the optical filter;
It includes an image sensor that converts light incident through the plurality of lenses into an electrical signal,
Each of the plurality of ribs is spaced apart from each other around an upper portion of the opening,
Each of the plurality of ribs has a first inclined surface around an upper portion of the opening,
The opening has a second inclined surface around the circumference,
The first angle, which is an interior angle between the first inclined plane and a horizontal straight line, is R1,
The second angle, which is an interior angle between the second inclined plane and a horizontal straight line, is R2,
The diagonal view angle of the image sensor is FOV,
Equation 1: 90°-(3/4*FOV) ≤ R1 ≤ 90°-(1/2*FOV)
Equation 2: 90°-(3/4*FOV) ≤ R2 ≤ 90°-(1/2*FOV)
A camera module that satisfies the requirements. According to clause 11,
The height of the head part is D1,
The height of the lens holder is D2, which is the height from the bottom of the head to the bottom of the lens holder,
The optical axis distance from the center of the object side of the first lens, which is closest to the object among the plurality of lenses, to the image sensor is TTL,
The number of lenses is nL,
Condition 1: 4 < (nL*D1*D2)/TTL < 8
A camera module that satisfies and nL is 3 to 5. According to clause 12,
1/2 of the maximum diameter of the head is D4,
Condition 2: D4 ≤ TTL
A camera module that satisfies the requirements. According to clause 11,
The inside of the spacing member has a third inclined surface,
The outer angle of the third inclined plane with respect to the horizontal straight line is R4,
The interior angle of a straight line passing through the end of the effective area of the sensor-side surface of the lens disposed on the object side of the spacer and the end of the effective area of the object-side surface of the lens disposed on the sensor side is R3,
Condition 3: FOV < R3
Condition 4: R4 ≤ FOV
A camera module that satisfies the requirements. According to clause 14,
Condition 5: 54 degrees < R3 < 90 degrees
A camera module that satisfies the requirements. According to clause 13,
Among the plurality of lenses, the first lens closest to the object has an object-side surface convex on the optical axis,
The top of the first inclined surface is disposed above a horizontal straight line passing through the center of the object-side surface of the first lens,
A camera module wherein the lower end of the first inclined surface is disposed below a horizontal straight line passing through the center of the object-side surface of the first lens. According to clause 16,
The height of the head part is D1,
The height of the lens holder is D2, which is the height from the bottom of the head to the bottom of the lens holder,
1/2 of the maximum diameter of the lens holder is D5,
Condition 6: 1 < D2/D1 < 3
Condition 7: 1 < D4/D5 < 3
A camera module that satisfies the requirements. According to clause 17,
Condition 8: Satisfies 1 < (D4*2)/(D1+D2) < 2,
The maximum diameter of the head part is B1,
The diameter of the opening is B0,
Condition 9: 0.1 < B0/B1 < 0.6
A camera module that satisfies the requirements. A driving assistance device having a camera module according to claim 1 or 11, wherein the camera module is an infrared camera.

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