WO2024107011A1

WO2024107011A1 - Camera module and electronic device comprising same

Info

Publication number: WO2024107011A1
Application number: PCT/KR2023/018561
Authority: WO
Inventors: 문성민
Original assignee: 엘지이노텍 주식회사
Priority date: 2022-11-18
Filing date: 2023-11-17
Publication date: 2024-05-23
Also published as: KR20240073475A

Abstract

A camera module according to an embodiment of the present invention comprises: a reflection member which reflects, in a second direction, light incident in a first direction; a lens holder having a plurality of lenses aligned along the second direction; a circuit board on which is disposed an image sensor for converting the light refracted through the plurality of lenses into an electrical signal; a housing covering the reflection member and the lens holder; and an inner wall portion having a reflection pattern on a portion of one side between the lens holder and the image sensor, wherein at least one of the plurality of lenses has a non-circular shape, and the upper part of the lens holder may have a shape that is shorter in the first direction than in a third direction perpendicular to the first and second directions.

Description

Camera module and electronic device having same

The present invention relates to a camera module and an electronic device including the same.

Camera modules perform the function of photographing objects and saving them as images or videos, and are installed in various applications. In particular, the camera module is manufactured in an ultra-small size and is applied to not only portable devices such as smartphones, tablet PCs, and laptops, but also drones and vehicles, providing various functions. For example, the optical system of the camera module may include an imaging lens that forms an image, and an image sensor that converts the formed image into an electrical signal. At this time, the camera module can perform an autofocus (AF) function that automatically adjusts the distance between the image sensor and the imaging lens to align the focal length of the lens, and can focus on distant objects through a zoom lens. The zooming function of zoom up or zoom out can be performed by increasing or decreasing the magnification of the camera. In addition, the camera module adopts image stabilization (IS) technology to correct or prevent image shake caused by camera movement due to an unstable fixation device or the user's movement.

The most important element for this camera module to obtain an image is the lens that forms the image. Recently, interest in high resolution has been increasing, and research is being conducted on optical systems including multiple lenses to realize this.

Camera modules with image sensors such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor Image Sensor) use filters (optical filters) with various optical functions to obtain clear images while reproducing color tones well. It is placed between the and image sensor. A representative example is an optical filter (near-infrared cut filter) that blocks light in the near-infrared wavelength region in order to correct the spectral sensitivity of the image sensor to human visibility, and the optical filter is placed between the last lens and the image sensor. This camera module has a plurality of lenses stacked, and light passing through the plurality of lenses is focused on an image sensor and can be stored as data in a memory within the device. However, since reflection or scattering of light incident on the camera module may cause a flare phenomenon such as light blurring, which may adversely affect image quality, it is necessary to block unnecessary light from proceeding to the image sensor. Therefore, a new camera module that can solve the above-mentioned problems is required.

Embodiments of the invention provide a camera module having a reflective pattern on the outer side between the last lens and the image sensor. Preferably, a camera module is provided that includes a housing having a lens barrel and a reflection pattern formed on an inner side of the housing adjacent to the image sensor.

Embodiments of the invention provide a camera module having a reflective pattern on a portion of the side between the optical filter and the last lens. Preferably, a camera module is provided that includes a housing having a lens barrel and a reflection pattern formed on an inner side or part of the housing adjacent to the optical filter.

An embodiment of the invention provides a camera module having a pattern for reflecting, absorbing, or scattering light traveling in an abnormal path among light traveling through a reflection member to a plurality of lenses. Embodiments of the invention can improve the reliability of a folded camera module.

A camera module according to an embodiment of the present invention includes a reflective member that reflects light incident in a first direction in a second direction; a lens holder having a plurality of lenses aligned along the second direction; a circuit board on which an image sensor is disposed to convert the light refracted through the plurality of lenses into an electrical signal; a housing surrounding the reflective member and the lens holder; and an inner wall portion having a reflection pattern on a portion of one side between the lens holder and the image sensor.

According to an embodiment of the invention, the reflective pattern may be disposed in a partial area of the inner wall portion, and the reflective pattern may be spaced apart from the bottom of the lens holder. The reflective pattern may be disposed between the bottom of the housing and the bottom of the lens holder. The reflective pattern may be disposed on a side opposite to the incident surface of the reflective member and in an area adjacent to the image sensor.

According to an embodiment of the invention, the housing includes a first opening exposing an incident surface of the reflective member and a second opening disposed on the image sensor, and the reflection pattern is formed at the top of the second opening and the lens. It can be placed on the outside between the holders.

According to an embodiment of the invention, the reflective pattern may include a concave pattern and a convex pattern alternately arranged in the second direction. The yaw pattern and the convex pattern of the reflective pattern may have a long length in a third direction orthogonal to the first and second directions.

A camera module according to an embodiment of the invention includes a reflective member that reflects light incident in a first direction in a second direction; a lens holder having a plurality of lenses aligned along the second direction; a circuit board on which an image sensor is disposed to convert the light refracted through the plurality of lenses into an electrical signal; a housing covering the optical member and the lens holder; and an inner wall portion having a reflection pattern on a portion of one side between the lens holder and the image sensor, wherein at least one of the plurality of lenses has a non-circular shape, and the upper shape of the lens holder has a length in the first direction. It may be smaller than the length of the third direction orthogonal to the first and second directions.

According to an embodiment of the invention, three or fewer lenses adjacent to the reflective member among the plurality of lenses may be non-circular lenses.

According to an embodiment of the invention, the inner wall portion may be a part of the inner surface of the other side of the housing. The housing includes one side having a first opening exposing the incident surface of the reflective member, the other side opposite the one side, and a second opening adjacent to the image sensor, and the reflection pattern is formed at the top of the second opening. It may be disposed on the other inner surface between the lens holder and the lens holder.

According to an embodiment of the invention, the length of the reflective pattern in the third direction may be equal to or smaller than the length of the second opening in the third direction. The reflective pattern is disposed between the lower end of the lens holder and the lower end of the housing on the other inner surface of the housing, and the reflective pattern may be spaced apart from the lower end of the lens holder.

According to an embodiment of the invention, it includes an optical filter disposed between the image sensor and the bottom of the housing, and the height of the reflection pattern is disposed at 20% or more of the optical axis distance between the image sensor and the last lens in the lens holder. , the length of the reflection pattern in the third direction may be smaller than the length of the optical filter in the third direction.

According to an embodiment of the invention, the reflective pattern has a concave pattern and a convex pattern arranged alternately in the second direction, and the concave pattern and the convex pattern of the reflective pattern are arranged in a third direction orthogonal to the first and second directions. It is disposed to have a long length, and the optical axis distance between the image sensor and the object side surface of the lens closest to the image sensor among the plurality of lenses is BFL and is 5 mm or more, and the height of the reflection pattern in the second direction is that of the BFL. It may be more than 20%.

A portable terminal or electronic device according to an embodiment of the invention may include the camera module disclosed above.

According to an embodiment of the invention, the intensity of flare can be reduced by dispersing light traveling in an abnormal path by placing a pattern on the inside of the camera module.

According to an embodiment of the invention, a pattern is formed on the side between the lens barrel and the image sensor to reflect, scatter, or absorb light transmitted to the image sensor through the side, thereby minimizing the occurrence of flare phenomenon. You can. The invention can improve the reliability of folded camera modules. The invention can improve the reliability of electronic devices having camera modules with improved reliability, portable terminals having the same, and unmanned or manned vehicles (vehicles, drones, bikes, water vehicles).

1 is a perspective view of a camera module according to an embodiment.

Figure 2 is a side cross-sectional view of the camera module of Figure 1.

FIG. 3 is an exploded perspective view of the lenses of the second lens assembly in the camera module of FIG. 2.

FIG. 4 is a plan view of lenses of the second lens assembly of FIG. 2 having different lengths in the first and second directions perpendicular to the optical axis.

Figure 5 is a partial side cross-sectional view of the second lens assembly and housing of Figure 2;

FIG. 6 is a perspective view illustrating a reflection pattern within the housing of FIG. 2.

Figure 7 is a perspective view of the housing of Figure 6 viewed from another direction.

FIG. 8 is a perspective view showing the lower structure and sensor assembly of the housing of FIG. 1.

FIG. 9 is a diagram showing a reflection pattern of the housing of FIG. 2.

Figures 10(A)(B) are another example of a reflection pattern of a housing.

Figures 11 (A) and (B) are diagrams comparing flare intensities incident on image sensors according to comparative examples and embodiments.

Figure 12 is a perspective view of a mobile terminal to which a camera module is applied according to an embodiment.

Figure 13 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

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 "on top or bottom" of each component, top or bottom 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 from the description of one of several embodiments may be applied to the description of other embodiments.

In the specification, the first lens refers to the lens closest to the object (or subject), and the last lens refers to the lens closest to the image surface (or image sensor). In this specification, the units of lens radius of curvature, thickness, TTL, ImgH (height of image surface: 1/2 of the diagonal length of image surface), and focal length are all in mm units. In addition, the thickness of the lens, the distance between lenses, and TTL are the distance from the optical axis of the lens. In addition, in the description of the shape of the lens, the shape of one side being convex means that the optical axis part of the surface is convex, and the shape of one side being concave means that the optical axis part of the surface is concave. Therefore, even if one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Likewise, even if one side of the lens is described as having a concave shape, the edge portion of the lens may be convex.

The optical system includes an optical system consisting of a plurality of lenses. For example, the optical system consists of a plurality of lenses with refractive power. The optical system may include a plurality of lenses with refractive power, a prism that refracts incident light, and an aperture (stop) to control the amount of light. Additionally, the optical system includes an optical filter for blocking infrared rays, and the optical filter may include an infrared blocking filter. Additionally, the optical system may further include an image sensor for converting an image of a subject incident through the optical system into an electrical signal. Additionally, the optical system may further include a gap maintenance member for adjusting the distance between lenses. Many lenses are made of materials that have a refractive index different from that of air. For example, many lenses are made of plastic or glass. At least one of the plurality of lenses has an aspherical shape.

FIG. 1 is a perspective view of a camera module according to an embodiment, FIG. 2 is a side cross-sectional view of the camera module of FIG. 1, FIG. 3 is an exploded perspective view of the lenses of the second lens assembly in the camera module of FIG. 2, and FIG. 4 is a Among the lenses of the second lens assembly of 2, the lenses have different lengths in the first and second directions perpendicular to the optical axis. FIGS. 5 to 7 are partial side cross-sectional views of the second lens assembly and housing of FIG. 2, FIG. 8 is a perspective view showing the lower structure and sensor assembly of the housing of Figure 1, Figure 9 is a diagram showing the reflection pattern of the housing of Figure 2, and Figures 10 (A) and (B) are another example of the reflection pattern of the housing. .

1 to 5, the camera module 1000 according to the embodiment may include a housing 1400, a first lens assembly 1100, a second lens assembly 1200, and a circuit board 1300. there is. Here, the first lens assembly 1100 may be used interchangeably as a first actuator, and the second lens assembly 1200 may be used interchangeably as a second actuator.

The housing 1400 may cover the first lens assembly 1100 and the second lens assembly 1200. The coupling force between the first lens assembly 1100 and the second lens assembly 1200 can be improved by the housing 1400. The housing 1400 may be made of a material that blocks electromagnetic waves. The housing 1400 may be made of metal. Accordingly, the first lens assembly 1100 and the second lens assembly 1200 within the housing 1400 can be easily protected.

The housing 1400 has a first opening 1401 open on the upper surface, and the first opening 1401 is an area where light enters the first lens assembly 1100. The first opening 1401 may overlap the first lens assembly 1100 in the vertical direction (X). The housing 1400 has a second opening 140 on the sensor side, and a shield can (not shown) connected to the circuit board 1300 may be placed in the second opening 140.

And the first lens assembly 1100 may be an Optical Image Stabilizer (OIS) actuator. For example, the first lens assembly 1100 may move the reflective member in a direction perpendicular to the optical axis (axis of incident light). The first lens assembly 1100 may include a fixed focal length lens disposed in a predetermined barrel (not shown). Fixed focal length lenses can be defined as “single focal length lenses” or “single-layer lenses.” The first lens assembly 1100 can change the path of light. In an embodiment, the first lens assembly 1100 may vertically change the path of light incident through the internal reflection member 1132. The reflective member 1132 may be, for example, a prism or mirror. For example, the reflective member 1132 may change light from the first direction (X) to the second direction (Z). Alternatively, the reflective member 1132 may change light from the first axis (X1) to the second axis (Z1). With this configuration, even if the thickness of the mobile terminal in the first direction ( ) and OIS functions can be performed. However, it is not limited to this, and the first lens assembly 1100 may be moved in multiple vertical directions along the optical path or may be tilted at a predetermined angle.

The first lens assembly 1100 may include a first carrier 110, a mover 112, a driving unit 117, and a tilt guide unit 115. The mover 112 includes a reflective member 1132 at the top, and the reflective member 1132 can reflect incident light in the direction of the second axis Z1. The reflective member 1132 may be made of a mirror or prism. Hereinafter, a prism is shown, but as in the above-described embodiment, it may be composed of a plurality of lenses. As another example, the additional reflection member may be comprised of a prism or mirror disposed behind the plurality of lenses 125. And the reflective member 1132 may include a reflective portion disposed therein. The reflective member 1132 and the mover 112 may be tilted along the tilt guide unit 115 by the driving unit 117.

The driving unit 117 is shown as an example located at the bottom of the mover 112, but may be further disposed on both sides of the mover 112. The driving unit 117 may include a plurality of rotors (not shown) disposed on the bottom and both sides of the mover 112, and a stator (not shown) at a position corresponding to the plurality of rotors. The rotor may be a magnet and the stator may be a coil. In the driving unit 117, a yoke and a Hall sensor may be disposed on the outside of each stator, respectively. The first lens assembly 1100 may perform an OIS function. The second lens assembly 1200 may perform zooming and AF functions. The configuration of the driving unit of the second lens assembly 1200 will be omitted.

The second lens assembly 1200 may be disposed behind the first lens assembly 1100. Here, the rear end of the first lens assembly 1100 is an area adjacent to the image sensor 1303. The second lens assembly 1200 may be disposed between the first lens assembly 1100 and the image sensor 1303 and may be coupled to the first lens assembly 1100. And mutual bonding can be achieved in various ways. The second lens assembly 1200 may be a zoom actuator or an auto focus (AF) actuator. For example, the second lens assembly 1200 includes one or more lenses 125 and can perform an auto-focusing function or a zoom function by moving at least one lens according to a control signal from a predetermined control unit. Additionally, one or more lenses 125 may move independently or individually along the optical axis direction.

The second lens assembly 1200 may include a plurality of lenses 125 and a lens holder 121. The second lens assembly 1200 may be placed inside the housing 1400. The second lens assembly 1200 may be disposed between the first lens assembly 1100 and the sensor assembly 1300. As another example, a third lens assembly may be further disposed between the second lens assembly 1200 and the sensor assembly 1300, and the third lens assembly may be a reflecting prism.

The second lens assembly 1200 may include a plurality of lenses 125 stacked along the second direction (Z). The plurality of lenses 125 may be three or more, for example, 3 to 7 lenses or 4 to 6 lenses. The lens holder 121 supports the plurality of lenses 125 and can support movement of at least one lens in the optical axis direction. Here, when at least one lens among the plurality of lenses 125 moves in the optical axis direction, the lens holder 121 may be separated into a fixed holder and a movable holder.

As shown in FIG. 7 , the maximum length E2 of the lens holder 121 in the first direction (X) may be different from the maximum length (E1) of the third direction (Y). The maximum length E2 of the lens holder 121 in the first direction (X) may be smaller than the maximum length E1 in the third direction (Y). The third direction (Y) is a direction perpendicular to the first and second directions (Z). Among the outer areas of the lens holder 121, the maximum lengths E2 and E1 of the areas adjacent to the first lens assembly 1100 in the first and third directions (X, Y) may be different from each other.

4 and 5 , at least one lens among the plurality of lenses 125 may have a length in the first direction (X) and a length in the third direction (Y) that are different from each other. For example, the maximum length C2 of the first lens 51 in the first direction (X) may be smaller than the maximum length (C1) of the first lens 51 in the third direction (Y). The first lens 51 may have a non-circular shape. The maximum length C2 of the second lens 52 in the first direction (X) may be smaller than the maximum length (C1) of the second lens 52 in the third direction (Y). The second lens 52 may have a non-circular shape. The maximum length C2 of the third lens 53 in the first direction (X) may be smaller than the maximum length (C1) of the third lens 53 in the third direction (Y). The third lens 53 may have a non-circular shape.

One, two, or all of the first to

third lenses

51, 52, and 53 may have a non-circular shape. At least one or more of the first to

third lenses

51, 52, and 53 are arranged such that the maximum length C2 in the first direction (X) is smaller than the maximum length (C1) in the third direction (Y). As shown in FIG. 7, the maximum length E2 of the lens holder 121 in the first direction (X) is disposed to be smaller than the maximum length E1 in the third direction (Y), so the The height in three directions (Y) can be lowered, and the height or thickness of the camera module 1000 in the third direction (Y) can be lowered. Accordingly, the thickness or height of the mobile terminal or electronic device having the camera module 1000 in the third direction (Y) can be reduced, and the thickness of the terminal or electronic device can be provided to be slim.

As shown in Figure 4, at least one of the first to

third lenses

51, 52, and 53 may have one or both sides in the first direction (X) with a flat surface. For example, one or both sides of the first lens 51 in the first direction (X) may be provided as flat surfaces, and both sides of the first lens 51 in the third direction (Y) may be provided as convex curved surfaces. One or both sides of the second lens 52 in the first direction (X) may be provided as flat surfaces, and both sides of the second lens 52 in the third direction (Y) may be provided as convex curved surfaces. One or both sides of the third lens in the first direction (X) may be provided as flat surfaces, and both sides of the third lens in the third direction (Y) may be provided as convex curved surfaces. At least one of the first to

third lenses

51, 52, and 53 has a length C32 in the third direction (Y) of the flat or cut surfaces (CS1 to CS6) in the third direction (Y) passing through the center of the optical axis. ) may be smaller than the length (C1) of

A first spacer 61 may be disposed around the object-side surface of the first lens 51. The first spacer 61 is a gap maintenance member or a light blocking member, and the maximum length of the internal through hole in the first direction (X) may be smaller than the maximum length in the third direction (Y).

A second spacer 62 may be disposed on the outer circumference between the first lens 51 and the second lens 52. The second spacer 62 is a gap maintenance member or a light blocking member, and the maximum length of the internal through hole in the first direction (X) may be smaller than the maximum length in the third direction (Y). A third spacer 63 may be disposed on the outer circumference between the second lens 52 and the third lens 53. The third spacer 63 is a gap maintenance member or a light blocking member, and the maximum length of the through hole in the first direction (X) may be smaller than the maximum length in the third direction (Y). A fourth spacer 64 may be disposed on the outer circumference between the third lens 53 and the fourth lens 54. The fourth spacer 64 is a gap maintenance member or a light blocking member, and the maximum length of the internal through hole in the first direction (X) may be smaller than the maximum length in the third direction (Y). The upper portion of the through hole of the fourth spacer 64 may be non-circular, and the lower portion may be circular.

A fifth spacer 64 may be disposed on the outer circumference between the fourth lens 54 and the fifth lens 55. The fifth spacer 65 is a gap maintenance member or a light blocking member, and the internal through hole may be circular. Among the plurality of lenses 125, the number of circular lenses may be equal to or smaller than the number of non-circular lenses. In the plurality of spacers 61 to 65, the number of spacers in which the through hole having the maximum length has a circular shape may be equal to or smaller than the number in which the spacer has a non-circular shape.

Since one or both sides of the lens with a relatively large effective diameter among the plurality of lenses 125 are cut and combined, the object-side opening 121A of the lens holder 121 accommodating the lenses is opened in the first direction ( The length in X) may be smaller than the length in the third direction (Y). Additionally, the object-side outer side surface S15 of the lens holder 121 may be provided as a flat surface or an inclined plane.

The housing 1400 has a second opening 140 in an area corresponding to the sensor assembly 1300, and the lenses 125 and the image sensor 1303 face each other through the second opening 140. You can. An optical filter 149 may be disposed on the second opening 140 of the housing 1400. The optical filter 149 may be disposed on the sensor side of the second opening 140 of the housing 1400. As another example, the optical filter 149 may be disposed on the object-side surface of the second opening 140 of the housing 1400.

The optical filter 140 may be disposed between the plurality of lenses 125 and the image sensor 1303. The optical filter 140 may include at least one of an infrared filter and/or a cover glass. The optical filter 140 may pass light in a set wavelength band and filter light in a different wavelength band. When the optical filter 140 includes an infrared filter, radiant heat emitted from external light can be blocked from being transmitted to the image sensor 1303. Additionally, the optical filter 140 can transmit visible light and reflect infrared rays.

The sensor assembly 1300 may include a circuit board 1301 and an image sensor 1303 disposed on one side of the circuit board 1301. The circuit board 1301 may be electrically connected to the connector board 1350. The circuit board 1301 may be electrically connected to the driving unit and Hall sensor of the first and

second lens assemblies

1100 and 1200. The image sensor 1303 may face the plurality of lenses 125 . The circuit board 1300 may include a circuit board with a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), or a rigid flexible PCB. You can. The circuit board 1300 may be electrically connected to another camera module within the terminal or a processor of the terminal. Through this, the lens assembly described above and the camera device including the same can transmit and receive various signals within the terminal.

The central positions of the plurality of lenses 125 in the second direction (Z) may be disposed closer to the reflective member 1132 than to the image sensor 1303. The distance (BFL: Back focal length) in the optical axis direction (Z) between the last lens 55 of the plurality of lenses 125 and the image sensor 1303 is 5 mm or more, for example, in the range of 5 mm to 15 mm or 5 mm to 10 mm. It can be. BFL may be equal to or greater than the maximum optical axis distance (TD: Total Distance) between the plurality of lenses 125. This can be provided as a folded camera module with a tele function by arranging the plurality of lenses 125 closer to the reflection member 1132 than the image sensor 1303.

An inner wall portion 150 having a pattern 151 may be included on a portion of the inner side of the housing 1400 or the outer side of the inner storage portion 120. The inner wall portion 150 may be an inner part of the housing 1400 or may be a separate structure disposed inside the housing 1400. The inner wall portion 150 may be made of metal or non-metallic material, and the non-metallic material may include plastic material. The inner wall portion 150 may be formed of the same material as the housing 1400 or may be formed of a different material. The inner wall portion 150 may be molded integrally with the housing 1400 or may be attached separately. The pattern 151 may reflect, scatter, or absorb incident light to reduce flare. Hereinafter, for convenience, the pattern 151 will be described as a reflective pattern.

The reflective pattern 151 may be formed on the inner surface of the housing 1400 or the surface of the inner wall portion 150, which is a structure. The reflective pattern 151 may be disposed in the first area A1 between the bottom of the housing 1400 and the bottom of the lens holder 121. The reflective pattern 151 may be disposed on a portion of the second inner surface S12 of the housing 1400. When the housing 1400 has a polygonal shape, the inner side of the surface where the first opening 1401 is disposed is the first inner surface S11, and the surface facing the first inner surface S11 is the second inner surface S11. It is a side surface (S12) and may include third and fourth inner surfaces (S13 and S14) facing each other on both sides of the first and second inner surfaces (S11 and S12). The reflective pattern 151 is disposed on a portion of the second inner side surface S12 in the first direction (X), or the first area A1 where the reflective pattern 151 is located is the It may be an area between the 3 inner surface (S13) and the fourth inner surface (S14).

The reflection pattern 151 is formed on a side of the inner side surfaces S11 to S14 of the housing 1400 opposite to the side where the first opening 1401 is formed, and is located in the area closest to the image sensor 1303. can be placed. That is, the reflective pattern 151 may be formed in the first area A1 corresponding to the path of some light L10 reflected by the reflective member 1132, as shown in FIG. 2. That is, some of the light L10 reflected by the reflection member 1132 is refracted through the plurality of lenses 125 and then reflected on the first area A1, and most of the reflected light is reflected by the image sensor ( 1303), and can increase the flare intensity within the image sensor 1303. Here, among the sides of the housing 1400, the incident side of the reflective member 1132 may be one side, and the side opposite to one side may be the other side. That is, one side of the housing 1400 is the first inner surface (S11), and the other side is the second inner surface (S12).

An embodiment of the invention forms a reflection pattern 151 in the first area A1, so that the light incident on the first area A1 through the plurality of lenses 125 is transmitted to the reflection pattern 151. The incident light may be reflected, absorbed, or scattered so as not to proceed directly toward the image sensor 1303. The first area A1 may be the second inner surface S12 or the other surface in the first direction (X). The first area A1 may be a partial area of the second inner surface S12 adjacent to the image sensor 1303 among the other surfaces in the first direction (X).

As shown in FIGS. 9 and 10 , the reflective pattern 151 may have a shape in which concavo-convex patterns are alternately arranged or may be formed as a rough surface 151B. The yaw pattern and the convex pattern are alternately arranged in the second direction (Z) and may have a long length (W1, FIG. 8) in the third direction (Y). As another example, the uneven pattern may be arranged to be inclined in a diagonal shape in the range of 10 to 80 degrees with respect to the third direction (Y).

2 and 5 to 7, the top of the reflective pattern 151 may be spaced a predetermined distance D2 from the bottom of the lens holder 121. The distance D2 may be 1 mm or more, for example, in the range of 1 mm to 2.5 mm. If the distance D2 is smaller than the above range, the improvement in reflection efficiency in the first area A1 may be minimal, and if the distance D2 is larger than the above range, the flare reduction effect may be minimal. That is, when the reflective pattern 151 is formed adjacent to the lower periphery of the lens holder 121, the amount of light incident on the reflective pattern 151 by the lower part of the lens holder 121 may be insignificant.

The bottom of the reflection pattern 151 extends to the bottom of the housing 1400 or the bottom of the second inner surface (S12), or the distance (D2) between the lens holder 121 and the top of the reflection pattern 151 ) can be separated from the bottom of the housing by a distance less than. The reflective pattern 151 may be spaced apart from both ends of the second inner surface S12. That is, the third direction width W2 of the second inner surface S12 may be greater than the third direction length W1 of the reflective pattern 151. Here, when the reflection pattern 151 extends to both ends of the second inner surface S12, the amount of light incident on the extended area is minimal, and the flare improvement effect may also be minimal.

The length W1 of the reflective pattern 151 in the third direction (Y) is smaller than the length W2 of the second inner surface S12 adjacent to the lower part of the lens holder 121 in the third direction (Y). You can. The length W1 of the reflective pattern 151 in the third direction (Y) is 40% or more, for example, 40% to 80% of the length W2 of the second inner surface S12 in the third direction (Y). range or 45% to 65%. If the length W1 of the reflection pattern 151 in the third direction (Y) is smaller than the above range, the flare reduction effect will be insignificant, and if it is larger than the above range, the amount of light incident on the surrounding area will be low and the flare improvement effect will be insignificant. You can.

The length or height (B4) of the reflective pattern 151 in the second direction (Z) may be 20% or more of BFL (B1, Figure 1), for example, in the range of 20% to 80% or 20% of BFL (B1). It can be formed in the range of 60% to 60%. If the length B4 of the reflection pattern 151 in the second direction (Z) is larger than the above range, the amount of incident light is low, and if it is smaller than the above range, the flare suppression effect may be minimal. The BFL (B1) is the distance on the optical axis between the image surface of the image sensor 1303 and the sensor side surface of the last lens. The length or height B4 of the reflection pattern 151 in the second direction Z is directed from the bottom S16 of the storage unit 120 or the top of the second opening 140 toward the lens holder 121. It is the height of the direction.

The length or height (B4) of the reflection pattern (151) in the second direction (Z) is the distance (B2) from the bottom (S16) of the receiving part (120) of the housing (1400) to the bottom of the lens holder (121). ), and may be arranged, for example, at least 51% of the distance B2, for example, in the range of 51% to 84% or in the range of 51% to 75%. If the length or height B4 of the reflection pattern 151 in the second direction (Z) is smaller than the above range, the flare improvement effect is minimal, and if it is larger than the above range, the incident occurs in the area adjacent to the lens holder 121. The amount of light may be minimal. Here, based on the distance B2 between the bottom of the lens holder 121 and the bottom of the housing 1400, the height B4 of the reflective pattern 151 is the height of the area without the reflective pattern 151. (i.e., D2), the height B4 may be greater than 51% of the distance B2, and D2 may be less than 50% of the distance B2. That is, when B2 is 1, B4:D2 can be in the range of 0.51:0.49 to 0.75:0.25.

The length W1 of the reflective pattern 151 in the first direction (X) may be equal to or smaller than the length W2 of the second opening 140 in the first direction (X). The length W1 of the reflection pattern 151 in the first direction (X) may be smaller than the length of the optical filter 140 in the first direction (X). Accordingly, the reflection pattern 151 is disposed on the outer surface between the lens holder 121 and the second opening 140 to reflect the amount of light incident on the inner wall 150 through the lens holder 121. Accordingly, the amount of light directly reflected from the inner wall 150 to the image sensor 1303 can be reduced and flare can be improved. As shown in FIG. 2, the distance D1 between the second axis Z1, that is, the optical axis, and the reflection pattern 151 may be 2.4 mm or more, for example, in the range of 2.4 mm to 4 mm or 3 mm to 3.5 mm. If the distance D1 is smaller than the above range, interference may occur and reduce image resolution, and if it is smaller than the above range, the light blocking effect may be minimal.

As shown in FIGS. 9 and 10 (A), the shape of the yaw pattern of the

reflective patterns

151 and 151A may include a triangular, semicircular, or semielliptic side cross section. The shape of the yaw pattern of the

reflection patterns

151 and 151A may be a vertical triangle or an equilateral triangle.

The yaw pattern depth T1 of the

reflective patterns

151 and 151A may be 0.1 mm or more, for example, 0.1 mm to 0.9 mm or 0.1 mm to 0.5 mm. If the recess depth T1 is less than the above range, reflection efficiency is reduced and the flare improvement effect is minimal, and if it is greater than the above range, the rigidity of the housing may be affected. The pitch T2 between the iron patterns of the

reflective patterns

151 and 151A may be 0.2 mm or more, for example, in the range of 0.2 mm to 1.2 mm, or in the range of 0.2 mm to 0.8 mm. If the pitch T2 between the iron patterns of the

reflection patterns

151 and 151A is outside the above range, reflection efficiency may be reduced. As shown in FIGS. 9 and 10(A), the hypotenuse of the triangular iron pattern may be disposed inclined toward the bottom of the housing or may be disposed inclined toward the lens holder. The internal angle (R1) of the groove pattern between adjacent iron patterns may be 30 degrees or more, for example, in the range of 25 degrees to 65 degrees or 35 degrees to 55 degrees, and if the angle (R1) is smaller than the above range, the amount of reflected light If it decreases and is greater than the above range, the flare reduction effect may be reduced. As shown in FIG. 10(B), the reflective pattern 151B may be formed with a rough surface. The rough surface may be formed of alternating convex and concave curves, thereby improving the reflection efficiency of incident light.

The inner wall portion 150 having the

reflective patterns

151, 151A, and 151B is formed integrally with the housing 1400, is formed on the lower base of the housing 1400, or is formed as a separate reinforcing plate made of plastic. It can be.

Figure 11 is a diagram measuring the flare intensity of a comparative example (A) without a reflective pattern on the inner wall portion and an example (B) with a reflective pattern. It can be seen that the flare intensity of the example of FIG. 11 (B) is significantly lower or almost eliminated compared to the comparative example (A).

As shown in FIG. 12, the mobile terminal 1500 of the embodiment may include a camera module 1000, a flash module 1530, and an autofocus device 1510 provided at the rear. The camera module 1000 may include an image capture function and an autofocus function. For example, the camera module 1000 may include an autofocus function using an image. The camera module 1000 processes image frames of still or moving images obtained by an image sensor in shooting mode or video call mode. The processed image frame can be displayed on a certain display unit and stored in memory. A camera (not shown) may also be placed on the front of the mobile terminal body. For example, the camera module 1000 may include a first camera module 1000A and a second camera module 1000B, and OIS along with AF or zoom functions may be implemented by the first camera module 1000A. You can.

The flash module 1530 may include a light emitting element inside that emits light. The flash module 1530 can be operated by operating a camera of a mobile terminal or by user control. The autofocus device 1510 may include one of the packages of surface light emitting laser devices as a light emitting unit. The autofocus device 1510 may include an autofocus function using a laser. The autofocus device 1510 can be mainly used in conditions where the autofocus function using the image of the camera module 1000 is degraded, for example, in close proximity of 10 m or less or in dark environments. The autofocus device 1510 may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device, and a light receiving unit such as a photo diode that converts light energy into electrical energy.

Figure 13 is a perspective view of a vehicle to which a camera module according to an embodiment is applied. Figure 13 is an external view of a vehicle equipped with a vehicle driving assistance device to which the camera module 1000 according to an embodiment is applied. Referring to FIG. 13, the vehicle 700 of the embodiment may be provided with wheels 13FL and 13FR that rotate by a power source and a predetermined sensor. The sensor may be a camera sensor (2000), but is not limited thereto.

The camera 2000 may be a camera sensor to which the camera module 1000 according to the embodiment is applied. The vehicle 700 of the embodiment may acquire image information through a camera sensor 2000 that captures a front image or surrounding image, determines the lane identification situation using the image information, and generates a virtual lane when identification is performed. can do. For example, the camera sensor 2000 may acquire a front image by photographing the front of the vehicle 700, and a processor (not shown) may acquire image information by analyzing objects included in the front image. For example, if the image captured by the camera sensor 2000 captures objects such as lanes, adjacent vehicles, obstacles, and indirect road markings such as median strips, curbs, and street trees, the processor detects these objects. This can be included in the video information. At this time, the processor can further supplement the image information by obtaining distance information to the object detected through the camera sensor 2000. Image information may be information about an object captured in an image. This camera sensor 2000 may include an image sensor and an image processing module.

The camera sensor 2000 can process still images or moving images obtained by an image sensor (eg, CMOS or CCD). The image processing module can process still images or moving images obtained through an image sensor, extract necessary information, and transmit the extracted information to the processor. At this time, the camera sensor 2000 may include, but is not limited to, a stereo camera to improve measurement accuracy of the object and secure more information such as the distance between the vehicle 700 and the object. Although the above description focuses on the examples, this is only an example and does not limit the present invention, and those skilled in the art will be able to You will see that various variations 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.

Claims

a reflective member that reflects light incident in a first direction in a second direction;

a lens holder having a plurality of lenses aligned along the second direction;

a circuit board on which an image sensor is disposed to convert the light refracted through the plurality of lenses into an electrical signal;

a housing surrounding the reflective member and the lens holder; and

A camera module comprising an inner wall portion having a reflection pattern on a portion of one side between the lens holder and the image sensor.
The method of claim 1, wherein the reflective pattern is disposed in a partial area of the inner wall portion,

The reflection pattern is spaced apart from the bottom of the lens holder.
The camera module of claim 1 or 2, wherein the reflective pattern is disposed between the lower end of the housing and the lower end of the lens holder.
The camera module of claim 1 or 2, wherein the reflective pattern is disposed on a surface opposite to the incident surface of the reflective member and an area adjacent to the image sensor.
The method of claim 1 or 2, wherein the housing includes a first opening exposing an incident surface of the reflective member and a second opening disposed on the image sensor,

The reflection pattern is disposed on the outside between the top of the second opening and the lens holder.
The camera module of claim 1 or 2, wherein the reflection patterns include concave patterns and convex patterns alternately arranged in the second direction.
The camera module according to claim 1 or 2, wherein the concave pattern and the convex pattern of the reflection pattern are arranged to have a long length in a third direction perpendicular to the first and second directions.
a reflective member that reflects light incident in a first direction in a second direction;

a lens holder having a plurality of lenses aligned along the second direction;

a circuit board on which an image sensor is disposed to convert the light refracted through the plurality of lenses into an electrical signal;

a housing covering the optical member and the lens holder; and

An inner wall portion having a reflective pattern on a portion of one side between the lens holder and the image sensor,

At least one of the plurality of lenses has a non-circular shape,

A camera module wherein the upper shape of the lens holder has a length in a first direction smaller than a length in a third direction orthogonal to the first and second directions.
The camera module of claim 8, wherein among the plurality of lenses, three or fewer lenses adjacent to the reflective member are non-circular lenses.
The camera module of claim 8, wherein the inner wall portion is a part of the inner surface of the other side of the housing.
The method of claim 8, wherein the housing includes one side having a first opening exposing an incident surface of the reflective member, another side opposite the one side, and a second opening adjacent to the image sensor,

The reflection pattern is disposed on the other inner surface between the top of the second opening and the lens holder.
The camera module of claim 11, wherein the length of the reflective pattern in the third direction is equal to or smaller than the length of the second opening in the third direction.
The method according to any one of claims 8 to 11,

The reflective pattern is disposed between the lower end of the lens holder and the lower end of the housing on the other inner surface of the housing,

The reflection pattern is spaced apart from the bottom of the lens holder.
The method according to any one of claims 8 to 11,

Includes an optical filter disposed between the image sensor and the bottom of the housing,

The height of the reflection pattern is arranged to be more than 20% of the optical axis distance between the last lens in the lens holder and the image sensor,

A camera module, wherein the length of the reflection pattern in the third direction is smaller than the length of the optical filter in the third direction.
The method according to any one of claims 8 to 11,

The reflective pattern has concave patterns and convex patterns arranged alternately in the second direction,

The yaw pattern and the convex pattern of the reflective pattern are arranged to have a long length in a third direction perpendicular to the first and second directions,

The optical axis distance between the image sensor and the object side of the lens closest to the image sensor among the plurality of lenses is BFL and is 5 mm or more,

A camera module wherein the height of the reflection pattern in the second direction is 20% or more of the BFL.