CAMERA DEVICE

The camera device disclosed to an embodiment includes a plurality of lenses which are arranged sequentially along an optical axis from an object side to an image side, and a lens barrel in which the plurality of lenses is received and which has an incident hole formed on an image surface thereof, wherein the lens barrel includes the plurality of lenses. A head part disposed in a region corresponding to a lens closest to an object side of the lens, and an upper portion of the head part may have a smaller length than that of a lower portion of the head part in a vertical direction of the optical axis.

TECHNICAL FIELD

An embodiment relates to a camera device that has improved optical performance and may be implemented in a compact size.

BACKGROUND ART

The camera device captures an object and stores it as an image or video, and is installed in various applications. In particular, the camera device is produced in a very small size and is applied to not only portable devices such as smartphones, tablet PCs, and laptops, but also drones and vehicles to provide various functions. For example, the camera device may include an imaging lens for forming an image, and an image sensor for converting the formed image into an electrical signal. In this case, the camera device may perform an autofocus (AF) function of aligning the focal lengths of the lenses by automatically adjusting the distance between the image sensor and the imaging lens, and may perform a zooning function of zooming up or zooning out by increasing or decreasing the magnification of a remote object through a zoom lens. In addition, the camera device employs an image stabilization (IS) technology to correct or prevent image stabilization due to an unstable fixing device or a camera movement caused by a user's movement.

The most important element for this camera device to obtain an image is an imaging lens that forms an image side. Recently, interest in high resolution is increasing, and research using five or six lenses is being conducted in order to realize this. For example, research using a plurality of imaging lenses having positive (+) and/or negative (−) refractive power is being conducted to realize high resolution. However, when a plurality of lenses is included, there is a problem in that it is difficult to derive excellent optical properties and aberration properties. Recently, camera device has been applied to various applications. For example, research is being conducted to arrange the camera device inside a display, touch panel, etc., and products to which this is applied are also being released. However, it is difficult to realize a compact camera device in consideration of optical characteristics of the plurality of lenses and reliability of a barrel accommodating the plurality of lenses. Accordingly, an area occupied by the camera device on a display or a touch panel increases, resulting in an increase in an area of an ineffective region that cannot be used by a user by the camera device. Therefore, a new optical system and camera device capable of solving the above problems are required.

DISCLOSURE

Technical Problem

An embodiment of the invention provides an optical system with improved optical properties.

An embodiment of the invention provides a camera device capable of miniaturizing a lens barrel.

Technical Solution

An optical system according to an embodiment of the invention comprises a plurality of lenses which are arranged sequentially from an object side toward an image side along an optical axis, and a lens barrel in which the plurality of lenses are received and which has an incident hole formed at an upper surface thereof, wherein the lens barrel comprises a head part which is disposed on a region corresponding to a lens closest to an object side of the plurality of lenses, and an upper portion of the head part may have a smaller length than that of a lower portion of the head part in a vertical direction to the optical axis.

According to an embodiment of the invention, the head part includes an inner side surface facing the lens closest to the object side and an outer side surface corresponding to the inner side surface, and the inner side surface may have two inclined surfaces having different or equal inclination angles. A distance between the inner side surface and the outer side surface may become closer from the upper portion of the head part toward the lower portion of the head part. A distance between the inner side surface and the outer side surface of the lower portion of the head part may be constant.

According to an embodiment of the invention, the lens closest to the object side includes a connection surface connecting an end of the effective diameter on the object-side surface and an upper surface of a rib part disposed around the effective region of the lens closest to the object side, a virtual first line parallel to the optical axis contacts the first end of the effective diameter and the first inner side surface of the lens barrel, and a first point where the virtual first line and the inner side surface of the lens barrel contact may have a maximum width at an upper portion of the head part of the lens barrel in a direction perpendicular to the optical axis. The connection surface and the inner side surface of the lens barrel may be spaced apart from each other. The connection surface and the inner side surface of the lens barrel may include regions parallel to each other. The virtual second line parallel to the optical axis contacts a second end of the effective diameter and the second inner side surface of the lens barrel, a second point contacts the virtual second line and the inner side surface of the lens barrel, and a virtual third line connecting the first point and the second point may contact the object-side surface of the lens closest to the object side.

According to an embodiment of the invention, the virtual second line parallel to the optical axis contacts the second end of the effective diameter and the second inner side surface of the lens barrel, and a second point contacts the virtual second line and the inner side surface of the lens barrel. A virtual third line connecting the first point and the second point may be spaced apart from the object-side surface of the lens closest to the object side.

According to an embodiment of the invention, a thickness of the connection surface in the optical axis direction may be thicker than the thickness of the rib part. Also, an inclination angle between the inner side surface of the head part and the optical axis may be greater than 0 degrees and less than 30 degrees.

A camera device according to an embodiment of the invention includes a plurality of lenses sequentially disposed along an optical axis from an object side toward an image side, the plurality of lenses includes a first lens disposed closest to the object side and a connection surface connecting an end of an effective diameter of an object-side surface thereof and an upper surface of a rib part disposed around an effective region of the first lens, and an inclination angle between the connection surface and the optical axis may be smaller than 30 degrees.

According to an embodiment of the invention, the inclination angle between the connection surface and the optical axis may be greater than 0 degrees and less than 30 degrees. The plurality of lenses includes the first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from the object side toward the image side along the optical axis, wherein the first and second lenses may satisfy Equation 1:

(In Equation 1, TL1means a distance from an apex on the optical axis of the object-side surface of the first lens to an apex on the optical axis of the object-side surface of the second lens. In addition, T2means a center thickness of the second lens).

The first lens may satisfy Equation 2:

(In Equation 2, Sag1is a Sag value of the object-side surface of the first lens, and means a distance from the apex on the optical axis of the object-side surface of the first lens to the end of the effective diameter of the object-side surface of the first lens in a direction of the optical axis, and T1means a center thickness of the first lens).

The first lens may satisfy Equation 3:

(In Equation 3, TH1means the distance from an apex on the optical axis of the object-side surface of the first lens to the upper surface of the rib part of the first lens in the direction of the optical axis).

Advantageous Effects

A camera device according to an embodiment may have improved optical characteristics. In detail, the optical system of the camera device may correct aberration characteristics and realize high-definition and high-resolution. A camera device according to an embodiment may be provided in a compact size. In detail, in the lens barrel of the camera device, the head part and the extension part may be provided in a stepped shape. Accordingly, when the camera device is inserted into and placed in a separate member such as a display, the size of the head part may be reduced, thereby minimizing an area of the camera device exposed to the surface of the member. In addition, an area of the non-effective region formed to the member by the camera device may be minimized.

A camera device according to an embodiment may have improved reliability. In detail, the first lens disposed in the head part may include a connection surface facing an inner side surface of the heat part, and the connection surface may have an inclination angle of less than about 30 degrees with respect to an optical axis. Accordingly, it is possible to prevent or minimize a change in the thickness of the lens barrel caused by the first lens in the lens barrel protruding by the head part. Accordingly, the size of the head part of the lens barrel may be minimized and reliability of the lens barrel may be improved.

BEST MODE

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. A technical spirit of the invention is not limited to some embodiments to be described, and may be implemented in various other forms, and one or more of the components may be selectively combined and substituted for use within the scope of the technical spirit of the invention. In addition, the terms (including technical and scientific terms) used in the embodiments of the invention, unless specifically defined and described explicitly, may be interpreted in a meaning that may be generally understood by those having ordinary skill in the art to which the invention pertains, and terms that are commonly used such as terms defined in a dictionary should be able to interpret their meanings in consideration of the contextual meaning of the relevant technology. Further, the terms used in the embodiments of the invention are for explaining the embodiments and are not intended to limit the invention. In this specification, the singular forms also may include plural forms unless otherwise specifically stated in a phrase, and in the case in which at least one (or one or more) of A and (and) B, C is stated, it may include one or more of all combinations that may be combined with A, B, and C. In describing the components of the embodiments of the invention, terms such as first, second, A, B, (a), and (b) may be used. Such terms are only for distinguishing the component from other component, and may not be determined by the term by the nature, sequence or procedure etc. of the corresponding constituent element. And when it is described that a component is “connected”, “coupled” or “joined” to another component, the description may include not only being directly connected, coupled or joined to the other component but also being “connected”, “coupled” or “joined” by another component between the component and the other component. In addition, in the case of being described as being formed or disposed “above (on)” or “below (under)” of each component, the description includes not only when two components are in direct contact with each other, but also when one or more other components are formed or disposed between the two components. In addition, when expressed as “above (on)” or “below (under)”, it may refer to a downward direction as well as an upward direction with respect to one element.

In this specification, a convex surface of the lens may mean that the lens surface of the region corresponding to the optical axis has a convex shape, and a concave surface of the lens may mean that the lens surface of the region corresponding to the optical axis has a concave shape. In addition, the “object-side surface” may refer to a surface of the lens facing the object side with respect to the optical axis, and the “image-side surface” may refer to the surface of the lens facing the imaging surface with respect to the optical axis. The vertical direction may mean a direction perpendicular to the optical axis, and an end of a lens or lens surface may mean an end of an effective region of a lens through which incident light passes.

FIGS.1and2are configuration diagrams of a camera device according to a first embodiment,FIG.3is a configuration diagram of a camera device according to a second embodiment, andFIG.4is a configuration diagram of a camera device according to a third embodiment.

Referring toFIGS.1to4, a camera device1000according to embodiments may include an optical system100including a plurality of lenses, a lens barrel200, and an image sensor300. The lens barrel200may include a receiving space therein. The plurality of lenses may be disposed in the receiving space. The lens barrel200may protect the plurality of lenses disposed in the receiving space from the outside and align the plurality of lenses with respect to the optical axis OA. The lens barrel200may include an inner side surface facing the plurality of lenses and an outer side surface corresponding to the inner side surface.

The lens barrel200may include a head part210and an extension part220. The head part210may be located to an upper portion of the lens barrel200based on the direction of the optical axis OA. In detail, the head part210may be located at the upper portion opposite to a lower portion of the lens barrel200adjacent to the image sensor300. The head part210may be disposed in a region corresponding to the first lens110closest to the object side among the plurality of lenses. The head part210may be disposed in a region corresponding to the effective region A1of the first lens110. The head part210may extend in the direction of the optical axis OA and protrude toward the object side. The head part210may have a set width d1. Here, the width d1of the head part210may mean the width in a direction perpendicular to the optical axis OA. The width d1of the head part210may be smaller than the width of the lower portion of the lens barrel200. In detail, the width of the upper portion of the head part210where the incident hole200hto be described later is formed may be smaller than the width of the lower portion of the lens barrel200. The head part210may have a set height d2. Here, the height d2of the head part210is the height in the direction of the optical axis OA and may mean a height from the upper surface of the head part210to the upper surface of the extension part220. When the camera device1000is inserted into an additional member (not shown) such as a display, the head part210may be a region inserted into a hole formed in the substrate. The width d1and the height d2of the head part210may vary according to the size of a hole formed in a member for insertion of the head part210. For example, when the camera device1000exhibits the same optical performance, the smaller the width d1of the head part210, the smaller the region occupied by the lens barrel200and the effective region of the member may be secured.

The extension part220may be connected to the head part210. The extension part220may be connected to the end of the head part210. The extension part220may be bent and extended from an upper end of the head part210. The extension part220may extend in a direction different from the direction of the optical axis OA. For example, the extension part220may extend from the end of the head part210in a direction perpendicular to the optical axis OA. The extension part220may be disposed in a region corresponding to the rib part RB1of the first lens110. Here, the rib part RB1of the first lens110is a region where no light is incident, and may be an ineffective region disposed around an effective region of the first lens110. The extension part220may be disposed facing the object-side surface1of the rib part RB1of the first lens110. The extension part220may directly contact the object-side surface111of the rib part RB1. The extension part220may have a set width. Here, the width of the extension part220may mean a width in a direction perpendicular to the optical axis OA. The width of the extension part220may be greater than a width d1of the head part210.

The lens barrel200may further include an incident hole200h. The incident hole200hmay be formed on an upper surface of the lens barrel200. The incident hole200hmay be disposed on the object-side surface of the lens barrel200. The incident hole200his formed through the center of the upper surface of the lens barrel200and may communicate with the receiving space of the lens barrel200. The incident hole200hmay be formed on the upper surface of the head part210. The incident hole200hmay be formed in a region corresponding to the effective region A1of the first lens110. A center of the incident hole200hmay overlap the optical axis OA. A part of the first lens110may be disposed inside the head part210in which the incident hole200his formed. For example, a part of the effective region A1of the first lens110may be inserted and disposed inside the head part210. The incident hole200hmay provide a path for light incident to the camera device1000. That is, the light incident to the camera device1000may be incident to the plurality of lenses through the incident hole200h, and the light path is controlled by the plurality of lenses to provide the image sensor300.

When describing the head part210in more detail, the head part210may include an upper region211and a lower region212. The upper region211may be a region in which the incident hole200his formed. The lower region212may be a region located at a lower portion adjacent to the image sensor300than the upper region211. The lower region212may be a region connecting the upper region211and the extension part220.

The head part210may include an inner side surface IS facing the first lens110and an outer side surface OS corresponding to the inner side surface IS, and the inner side surface IS may include a first inner side surface IS1and a second inner side surface IS2. The first inner side surface IS1may be an inner side surface of the upper region211of the head part210. The first inner side surface IS1may be connected to the incident hole200h. The first inner side surface IS1may extend in the direction of the image sensor300. Also, the second inner side surface IS2may be an inner side surface of the lower region212of the head part210. The second inner side surface IS2may be connected to the first inner side surface IS1. The second inner side surface IS2is located lower than the first inner side surface IS1and may extend in the direction of the image sensor300. The first inner side surface IS1and the second inner side surface IS2may have an inclination set with respect to the optical axis OA. For example, an inclination angle of the first inner side surface IS1with respect to the optical axis OA may be greater than 0 degree and less than 30 degrees. Also, the inclination angle of the second inner side surface IS2with respect to the optical axis OA may be greater than or equal to 0 degree and less than 30 degrees. In addition, the inclination angles of the first inner side surface IS1and the second inner side surface IS2with respect to the optical axis OA may be different from each other. In this case, the inclination angle of the first inner side surface IS1may be greater than the inclination angle of the second inner side surface IS2. Alternatively, the inclination angles of the first inner side surface IS1and the second inner side surface IS2with respect to the optical axis OA may be equal to each other.

The upper region211and the lower region212of the head part210may have lengths in a vertical direction to the set optical axis. In detail, a vertical length to the optical axis OA from the optical axis OA to the inner side surface IS1of the upper region211may increase toward the image sensor300from the object side. In addition, the length in the vertical direction to the optical axis OA from the optical axis OA to the inner side surface IS2of the lower region212may increase or be constant from the upper region211toward the image sensor. The length in the vertical direction to the optical axis OA from the optical axis OA to the first inner side surface IS1of the upper region212may be smaller than a vertical length to the optical axis OA from the optical axis OA to the second inner side surface IS2of the lower region212. In detail, the minimum value of the vertical length to the optical axis OA in the upper region212may be smaller than the minimum value of the vertical length to the optical axis OA in the lower region212. Also, the maximum value of the vertical length to the optical axis OA in the upper region211may be smaller than or equal to the maximum value of the vertical length to the optical axis OA in the lower region212.

Also, the upper region211and the lower region212of the head part210may have set widths. Here, the width is a distance between the inner side surface IS and the outer side surface OS of the head part210in a direction perpendicular to the optical axis OA, and may mean the thickness of the head part210. A width of the head part210may decrease from the upper region211toward the lower region212. In detail, the distance between the first inner side surface IS1and the outer side surface OS in the upper region211may become closer toward the image sensor300from the object side. Also, the distance between the second inner side surface IS2and the outer side surface OS in the lower region212may be closer or constant toward the image sensor300from the object side.

The camera device1000may include a virtual first line L1parallel to the optical axis OA. The first line L1is in contact with the first end P1defined as one end of the effective diameter of the object-side surface (first surface S1) of the first lens110, and may be contacted with the inner side surface of the lens barrel200. Here, the first end P1may be a contact point between the first surface S1of the first lens110and a connection surface113to be described later. The first line L1may contact the inner side surface IS of the head part210. In detail, the first line L1may contact the first inner side surface IS1that is the inner side surface of the upper region211of the head part210. Here, the contact point between the first line L1and the first inner side surface IS1may be defined as a first point IP1. The upper region211of the head part210may have a maximum width in a direction perpendicular to the optical axis OA at the first point IP1.

The camera device1000may include a virtual second line L2parallel to the optical axis OA. The second line L2may be in contact with the second end P2defined as the other end of the object-side surface (first surface S1) of the first lens110, and may be in contact with the inner side surface of the lens barrel200. Here, the second end P2may be a contact point between the connection surface113and the rib part RB1. The second line L2may contact the inner side surface IS of the head part210. In detail, the second line L2may contact the first inner side surface IS1or the second inner side surface IS2of the head part210. Here, the contact point where the second line L2and the inner side surface IS of the head part210are in contact with each other may be defined as a second point IP2. At this time, a third line (not shown), which is a virtual straight line passing through the first point IP1and the second point IP2according to the embodiment, is included, and the third line may be in contact with or spaced apart from the lens closest to the object side, for example, the object-side surface (first surface S1) of the first lens110.

The optical system100according to the embodiment may be disposed at a position set by the lens barrel200. For example, the first lens110may be disposed such that a part of the effective region A1may be inserted into the head part210corresponding to the incident hole200h, and the rib part RB1may be disposed on an inner side surface of the extension part220of the lens barrel200. Accordingly, the first lens110may be aligned with the optical axis OA in the lens barrel200and disposed at a fixed position.

In addition, the camera device1000according to the embodiment may include the head part210and the extension part220having a stepped shape, and may include the above-described outer side surface OS, the inner side surface IS, and the extension part220and the like. Accordingly, when the camera device1000is inserted and disposed in an additional member such as a display, the size of the head part210inserted into the member may be reduced. Accordingly, an area exposed to the surface of the member by the camera device1000may be minimized, and an area of an ineffective region formed on the member by the camera device1000may be effectively reduced.

The optical system100may include a plurality of lenses. For example, the optical system100may include four or more lenses. In detail, the optical system100may include five lenses. The optical system100may include the first lens110, the second lens120, the third lens130, the fourth lens140, and the fifth lens150. The first to fifth lenses110,120,130,140, and150may be sequentially disposed along the optical axis OA of the optical system100. The light corresponding to the object information passes through the first lens110, the second lens120, the third lens130, the fourth lens140, and the fifth lens150, and may be incident on the image sensor300. Each of the first to fifth lenses110,120,130,140, and150may include an effective region and an ineffective region. The effective region may be a region through which light incident to each of the first to fifth lenses110,120,130,140, and150passes. That is, the effective region may be a region in which the incident light is refracted to implement optical characteristics. The non-effective region is a rib part disposed around the effective region, and may be a region to which the light is not incident. The non-effective region may be a region unrelated to the optical characteristics. Also, the non-effective region may be a region fixed to the lens barrel200or the like.

The image sensor300may detect light. In detail, the image sensor300may detect light sequentially passing through the first to fifth lenses110,120,130,140, and150. The image sensor300may include a charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS).

A filter (not shown) may be further disposed between the plurality of lenses110,120,130,140, and150and the image sensor300. The filter may be disposed between the image sensor300and the last lens (fifth lens150) closest to the image sensor300among the plurality of lenses110,120,130,140, and150. The filter may include at least one of an infrared filter and an optical filter such as a cover glass. The filter may pass light of a set wavelength band and filter light of a different wavelength band. When the filter includes an infrared filter, radiant heat emitted from external light may be blocked from being transferred to the image sensor300. In addition, the filter may transmit visible light and reflect infrared light.

The camera device1000according to the embodiment may include an aperture stop (not shown) for adjusting the amount of incident light. The aperture stop may be disposed between the object and the first lens110or between two lenses selected from among the first to fifth lenses110,120,130,140, and150. For example, the aperture stop may be disposed on the object-side surface of the first lens110. At least one lens of the first to fifth lenses110,120,130,140, and150may serve as an aperture stop. For example, an object-side surface or an image-side surface of one lens selected from among the first to fifth lenses110,120,130,140, and150may serve as an aperture stop for adjusting the amount of light.

Hereinafter, a plurality of lenses included in the optical system100according to the embodiment will be described in more detail.

Table 1 shows the radius of curvature, the thickness or each lens, and the distance between the lenses, refractive index, Abbe number, and focal length of the first to fifth lenses110,120,130,140, and150according to the embodiment. Referring to Table 1, the first lens110may have positive (+) refractive power. The first lens110may include a plastic or glass material. For example, the first lens110may be made of a plastic material. The first lens110may include a first surface S1defined as an object-side surface and a second surface S2defined as an image-side surface. In this case, the first surface S1may be convex. The second surface S2may be concave. That is, the first lens110may have a meniscus shape convex toward the object side. At least one of the first surface S1and the second surface S2may be an aspheric surface. For example, both the first surface S1and the second surface S2may be aspherical. The first lens110may include a connection surface113. The connection surface113may be a surface disposed between the first surface S1and the object-side surface111that is the upper surface of the rib part RB1. In detail, the connection surface113may be a surface that connects between the first end P1of the effective diameter of the object-side surface (first surface S1) of the first lens110and the upper surface111of the rib part RB1. The connection surface113may have at least one of a straight line and a curved shape. For example, the connection surface113may be provided in a straight-line shape to connect the end of the effective diameter and the upper surface111of the rib part RB1. The connection surface113may face an inner side surface of the head part210formed by the incident hole200h. The connection surface113may have a set thickness. Here, the thickness may mean a thickness in the direction of the optical axis OA. A thickness of the connection surface113may be greater than a thickness of the rib part RB1of the first lens110. The connection surface113may be formed to have a set inclination angle with respect to the optical axis OA. An inclination angle between the connection surface113and the optical axis OA may be less than about 30 degrees. Also, in the first lens110, a boundary between the connection surface113and the upper surface111of the rib part RB1may have an angular shape having a set angle. However, the embodiment is not limited thereto, and the boundary may be provided as a curved surface having a predetermined curvature.

The second lens120may have negative (−) refractive power. The second lens120may include a plastic or glass material. For example, the second lens120may be made of a plastic material. The second lens120may include a third surface S3defined as an object-side surface and a fourth surface S4defined as an image-side surface. The third surface S3may be convex. The fourth surface S4may be concave. That is, the second lens120may have a meniscus shape convex toward the object side. At least one of the third and fourth surfaces S3and S4may be an aspherical surface. For example, both the third surface S3and the fourth surface S4may be aspheric surfaces.

The third lens130may have positive (+) or negative (−) refractive power. In detail, the third lens130may have positive (+) refractive power. The third lens130may include a plastic or glass material. For example, the third lens130may be made of a plastic material. The third lens130may include a fifth surface S5defined as an object-side surface and a sixth surface S6defined as an image-side surface. The fifth surface S5may be convex. The sixth surface S6may be concave. That is, the third lens130may have a meniscus shape convex toward the object side. At least one of the fifth surface S5and the sixth surface S6may be an aspherical surface. For example, both the fifth surface S5and the sixth surface S6may be aspheric surfaces.

The fourth lens140may have positive (+) refractive power. The fourth lens140may include a plastic or glass material. For example, the fourth lens140may be made of a plastic material. The fourth lens140may include a seventh surface S7defined as an object-side surface and an eighth surface S8defined as an image-side surface. The seventh surface S7may be concave. The eighth surface S8may be convex. That is, the fourth lens140may have a meniscus shape convex toward the image side. At least one of the seventh surface S7and the eighth surface S8may be an aspherical surface. For example, both the seventh surface S7and the eighth surface S8may be aspheric surfaces.

The fifth lens150may have negative (−) refractive power. The fifth lens150may include a plastic or glass material. For example, the fifth lens150may be made of a plastic material. The fifth lens150may include a ninth surface S9defined as an object-side surface and a tenth surface S10defined as an image-side surface. The ninth surface S9may be concave. The tenth surface S10may be concave. That is, the fifth lens150may have a concave shape on both sides. At least one of the ninth surface S9and the tenth surface S10may be an aspheric surface. For example, both the ninth surface S9and the tenth surface S10may be aspheric surfaces.

In the optical system100according to the embodiment, the value of the aspheric coefficient of each lens surface is shown in Table 2 below.

Referring to the following drawings, a plurality of embodiments of the inclination angle of the connection surface113of the first lens110will be described. Referring toFIGS.1and2, in the first embodiment, the head part210may include an upper region211including a first inner side surface IS1and a lower region212including a second inner side surface IS2. The first inner side surface IS1and the second inner side surface IS2may have an inclination set with respect to the optical axis OA. For example, an inclination angle of the first inner side surface IS1with respect to the optical axis OA may be greater than 0 degree and less than 30 degrees. Also, an inclination angle of the second inner side surface IS2with respect to the optical axis OA may be greater than or equal to 0 degree and less than 30 degrees. For example, the inclination angle of the second inner side surface IS2may be 0 degrees parallel to the optical axis OA. That is, in the first embodiment, the inclination angle of the first inner side surface IS1may be greater than that of the second inner side surface IS2.

The upper region211and the lower region212of the head part210may have lengths in a vertical direction to the set optical axis OA. In detail, the vertical length to the optical axis OA from the optical axis OA to the inner side surface IS1of the upper region211may increase toward the image sensor300from the object side. In addition, the vertical length to the optical axis OA from the optical axis OA to the inner side surface IS2of the lower region212may be constant from the upper region211toward the image sensor300.

In this case, the vertical length to the optical axis OA from the optical axis OA to the first inner side surface IS1of the upper region211may be smaller than the length in the vertical direction to the optical axis OA from the optical axis OA to the second inner side surface IS2of the lower region212. In detail, the minimum value of the vertical length of the optical axis OA in the upper region211may be smaller than the minimum value of the vertical length of the optical axis OA in the lower region212. Also, the maximum value of the vertical length of the optical axis OA in the upper region211may be the same as the maximum value of the vertical length of the optical axis OA in the lower region212. The upper region211and the lower region212of the head part210may have set widths. In detail, a distance (width) between the first inner side surface IS1and the outer side surface OS in the upper region211may become closer toward the image sensor300from the object side. In addition, the distance (width) between the second inner side surface IS2and the outer side surface OS in the lower region212does not change toward the image sensor300from the object side and may be constant. The first lens110disposed in the head part210may include the connection surface113having a set inclination angle. In detail, the connection surface113may connect between the first end P1of the first surface S1of the first lens110and the upper surface111of the rib part RB1and may have a straight-line shape.

In the first embodiment, an inclination angle between the connection surface113and the optical axis OA may be less than about 30 degrees. In detail, the inclination angle may be 0 degrees. That is, the connection surface113may be disposed parallel to the optical axis OA and may include a region parallel to the inner side surface IS. For example, the connection surface113may be disposed parallel to the second inner side surface IS2. Also, the connection surface113may be spaced apart from the inner side surface IS of the head part210. The camera device1000may include a first line L1and a second line L2parallel to the optical axis OA. The first line L1may contact the first end P1of the first lens110and the first point IP1of the inner side surface IS of the head part210. Also, the second line L2may contact the second end P2of the first lens110and the second point IP2of the inner side surface IS of the head part210.

The connection surface113according to the first embodiment may have an inclination angle of 0 degrees with respect to the optical axis OA. Accordingly, the first line L1and the second line L2may overlap. That is, the first point IP1and the second point IP2may be the same point, and the first end P1and the second end P2may be arranged on the same line as the first line L1or the second line L2. Accordingly, the third line extending through the first point IP1and the second point IP2and parallel to the optical axis OA may contact the first surface S1of the first lens110. In detail, the third line may be in contact with the first end P1of the first surface S1.

Accordingly, a region of the lens barrel200corresponding to the first lens110may have improved reliability. For example, a boundary region between the head part210and the extension part220in the lens barrel200may have relatively weak rigidity due to the protruding head part210. However, in the first embodiment, as the inclination angle satisfies 0 degrees, the thickness between the outer side surface of the head part210and the inner side surface of the head part210facing the first lens110may not be changed by the first lens110. Accordingly, in the lens barrel200, each of a boundary region between the head part210and the extension part220, the head part210and the extension part220may have a thickness to secure rigidity. As a result, the lens barrel200may have improved reliability. In addition, the lens barrel200may effectively reduce the size of the head part210inserted into the member.

Referring toFIG.3, in the second embodiment, the head part210may have the upper region211including a first inner side surface IS1and the lower region212including a second inner side surface IS2. The first inner side surface IS1and the second inner side surface IS2may have an inclination set with respect to the optical axis OA. For example, an inclination angle of the first inner side surface IS1with respect to the optical axis OA may be greater than 0 degree and less than 30 degrees. Also, an inclination angle of the second inner side surface IS2with respect to the optical axis OA may be greater than 0 degrees and less than 30 degrees. For example, in the second embodiment, the inclination angle of the first inner side surface IS1may be greater than that of the second inner side surface IS2.

The upper region211and the lower region212of the head part210may have lengths in a vertical direction to the set optical axis OA. In detail, a vertical length to the optical axis OA from the optical axis OA to the inner side surface IS1of the upper region211may increase toward the image sensor300from the object side. In addition, the vertical length of the optical axis OA from the optical axis OA to the inner side surface IS2of the lower region212may increase from the upper region211toward the image sensor300. The length in the vertical direction of the optical axis OA from the optical axis OA to the first inner side surface IS1of the upper region212may be smaller than the vertical length to the optical axis OA from the optical axis OA to the second inner side surface IS2of the lower region212. In detail, the minimum value of the vertical length of the optical axis OA in the upper region212may be smaller than the minimum value of the vertical length of the optical axis OA in the lower region211. Also, the maximum value of the vertical length of the optical axis OA in the upper region211may be smaller than the maximum value of the vertical length of the optical axis OA in the lower region212.

The upper region211and the lower region212of the head part210may have set widths. In detail, a distance (width) between the first inner side surface IS1and the outer side surface OS in the upper region211may become closer toward the image sensor300from the object side. In addition, a distance (width) between the second inner side surface IS2and the outer side surface OS in the lower region212may become closer toward the image sensor300from the object side. In this case, the maximum distance between the first inner side surface IS1and the outer side surface OS may be greater than the maximum distance between the second inner side surface IS2and the outer side surface OS. The first lens110disposed in the head part210may include a connection surface113having a set inclination angle. In detail, the connection surface113may connect the first end P1of the first surface S1of the first lens110and the upper surface111of the rib part RB1and may have a straight-line shape.

In the second embodiment, an inclination angle θ1between the connection surface113and the optical axis OA may be less than about 30 degrees. In detail, the inclination angle θ1may be about 10 degrees. The connection surface113may be spaced apart from the inner side surface IS of the head part210. The camera device1000may include a first line L1and a second line L2parallel to the optical axis OA. The first line L1may contact the first end P1of the first lens110and the first point IP1of the inner side surface IS of the head part210. Also, the second line L2may contact the second end P2of the first lens110and the second point IP2of the inner side surface IS of the head part210. The connection surface113according to the second embodiment may have an inclination angle of less than about 30 degrees with respect to the optical axis OA. Accordingly, the second line L2may be positioned above the first line L1based on the optical axis OA. As a result, the virtual third line extending through the first point IP1and the second point IP2may be separated from the first surface S1of the first lens110and the connection surface113.

Referring toFIG.4, in the third embodiment, the head part210may include an upper region211including a first inner side surface IS1and a lower region212including a second inner side surface IS2. The first inner side surface IS1and the second inner side surface IS2may have an inclination set with respect to the optical axis OA. For example, an inclination angle of the first inner side surface IS1with respect to the optical axis OA may be greater than 0 degree and less than 30 degrees. Also, an inclination angle of the second inner side surface IS2with respect to the optical axis OA may be greater than 0 degrees and less than 30 degrees. For example, in the third embodiment, the inclination angle of the first inner side surface IS1may be greater than that of the second inner side surface IS2.

The upper region211and the lower region212of the head part210may have lengths in a vertical direction to the set optical axis OA. In detail, a vertical length to the optical axis OA from the optical axis OA to the inner side surface IS1of the upper region211may increase toward the image sensor300from the object side. In addition, a length in the vertical direction of the optical axis OA from the optical axis OA to the inner side surface IS2of the lower region212may increase from the upper region211toward the image sensor300.

In this case, the length in the vertical direction to the optical axis OA from the optical axis OA to the first inner side surface IS1of the upper region211may be smaller than the length in the vertical length to the optical axis OA from the optical axis OA to the second inner side surface IS2of the lower region212. In detail, the minimum value of the vertical length to the optical axis OA in the upper region211may be smaller than the minimum value of the vertical length to the optical axis OA in the lower region212. Also, the maximum value of the vertical length to the optical axis OA in the upper region211may be smaller than the maximum value of the vertical length to the optical axis OA in the lower region212. The upper region211and the lower region212of the head part210may have set widths. In detail, a distance (width) between the first inner side surface IS1and the outer side surface OS in the upper region211may become closer toward the image sensor300from the object side. In addition, a distance (width) between the second inner side surface IS2and the outer side surface OS in the lower region212may become closer toward the image sensor300from the object side. In this case, the maximum distance between the first inner side surface IS1and the outer side surface OS may be greater than the maximum distance between the second inner side surface IS2and the outer side surface OS. The first lens110disposed in the head part210may include a connection surface113having a set inclination angle. In detail, the connection surface113may connect the first end P1of the first surface S1of the first lens110and the upper surface111of the rib part RB1and may have a straight-line shape.

In the third embodiment, an inclination angle θ1between the connection surface113and the optical axis OA may be less than about 30 degrees. In detail, the inclination angle θ1may be about 20 degrees. The connection surface113may be spaced apart from the inner side surface IS of the head part210. The camera device1000may include a first line L1and a second line L2parallel to the optical axis OA. The first line L1may contact the first end P1of the first lens110and the first point IP1of the inner side surface IS of the head part210. Also, the second line L2may contact the second end P2of the first lens110and the second point IP2of the inner side surface IS of the head part210. The connection surface113according to the third embodiment may have an inclination angle of less than about 30 degrees with respect to the optical axis OA. Accordingly, the second line L2may be positioned above the first line L1based on the optical axis OA. As a result, the virtual third line extending through the first point IP1and the second point IP2may be separated from the first surface S1of the first lens110and the connection surface113.

In the lens barrel200according to the second and third embodiments, the boundary region between the head part210and the extension part220may have relatively weak in rigidity due to the protruding head part210. However, in the second and third embodiments, the inclination angles θ1and θ2may be less than about 30 degrees, about 10 degrees and about 20 degrees, respectively. Accordingly, it is possible to minimize a change in the thickness between the outer and inner side surfaces of the head part210by the first lens110. That is, in the embodiments, each of the boundary region between the head part210and the extension part220in the lens barrel200, the head part210and the extension part220may have a thickness for securing rigidity. Therefore, the lens barrel200may have improved reliability. In addition, the lens barrel200may effectively reduce the size of the head part210inserted into the member.

The camera device1000according to the above-described embodiments may satisfy at least one of conditional expressions described below. Accordingly, the camera device1000according to the embodiment has an optically improved effect and may be implemented in a small size. Also, the camera device1000may have improved reliability.

In Equation 1, θ means an inclination angle (degree) between the connection surface113of the first lens110and the optical axis OA.

In Equation 2, TL1means a distance (mm) from an apex on the optical axis OA of the object-side surface (first surface S1) of the first lens110to the apex on the optical axis OA of the object-side surface (third surface S3) of the second lens120. Also, T2means the center thickness (mm) of the second lens120.

In Equation 3, Sag1is a Sag value of the object-side surface (first surface S1) of the first lens110, and means a distance (mm) from the apex on the optical axis OA of the object-side surface of the first lens110to the end of the effective diameter of the object-side surface (first surface S1) of the first lens110in the direction of the optical axis OA. Also, T1means the center thickness (mm) of the first lens110.

In Equation 4, TH1means a distance (mm) from the apex on the optical axis OA of the object-side surface (first surface S1) of the first lens110to the upper surface111of the rib part RB1of the first lens110in the direction of the optical axis OA. In addition, TL1means the distance (mm) from the apex on the optical axis OA of the object-side surface (first surface S1) of the first lens110to the apex on the optical axis OA of the object-side surface (third surface S3) of the second lens120.

In Equation 5, d2means a height (mm) of the head part210in the direction of the optical axis OA, and TL1means a distance (mm) from an apex on the optical axis OA of the object-side surface (first surface S1) of the first lens110to the apex on the optical axis OA of the object-side surface (third surface S3) of the second lens120.

In Equation 6, F means the total focal length (mm) of the optical system100, d1is a diameter of the head part210and means a width (mm) of the head part210in the direction perpendicular to the optical axis OA.

In Equation 7, total track length (TTL) means a distance (mm) from the apex of the object-side surface (first surface S1) of the first lens110to the upper surface of the image sensor300in the direction of the optical axis OA, and Img means a distance in a vertical direction from the upper surface of the image sensor300which is overlapped with the optical axis OA to a region of a 1.0 field of the image sensor300. That is, Img means a value of ½ of the diagonal length (mm) of the effective region of the image sensor300.

In Equation 8, F means the total focal length (mm) of the optical system100, and TTL (Total track length) means a distance (mm) from the apex of the object-side surface (first surface S1) of the first lens110to the upper surface of the image sensor300in the direction of the optical axis OA.

In Equation 9, F means the total focal length (mm) of the optical system100, and f1 means the focal length (mm) of the first lens110.

In Equation 10, TH2means a distance (mm) from the apex on the optical axis OA of the image-side surface (second surface S2) of the first lens110to the lower surface of the rib part RB1of the first lens110in the direction of the optical axis OA. Here, the lower surface of the rib part RB1may be opposite to the upper surface111of the rib part RB1. Also, EG1means the thickness (mm) of the rib part RB1of the first lens110in the direction of the optical axis OA.

In Equation 11, EG1means the thickness (mm) of the rib part RB1of the first lens110in the direction of the optical axis OA, and TL1means a distance (mm) from an apex on the optical axis OA of the object-side surface (first surface S1) of the first lens110to the apex on the optical axis OA of the object-side surface (third surface S3) of the second lens120.

In Equation 12, TTL (Total track length) means a distance (mm) from the apex of the object-side surface (first surface S1) of the first lens110to the upper surface of the image sensor300in the direction of the optical axis OA, and d2means the height (mm) of the head part210in a direction of the optical axis OA.

In Equation 13, d1means the width (mm) of the head part210in the direction perpendicular to the optical axis, and means a distance in a vertical direction from the upper surface of the image sensor300which is overlapped with the optical axis OA to a region of a 1.0 field of the image sensor300. That is, Img means a value of ½ of the diagonal length (mm) of the effective region of the image sensor300.

In Equation 14, G1means the refractive index of the first lens110for light in the 587 nm band.

In Equation 15, V1means the Abbe number of the first lens110.

In Equation 16, G2means the refractive index of the second lens120for light in the 587 nm band.

In Equation 17, V2means the Abbe number of the second lens120.

In Equation 18, Z is Sag and may mean a distance from an arbitrary position on the aspheric surface to the apex of the aspherical surface in the direction of the optical axis. Y may mean a distance from an arbitrary position on the aspheric surface to the optical axis in a direction perpendicular to the optical axis. Also, c may mean the curvature of the lens, and K may mean the conic constant. The A, B, C, D, E, and F may mean aspheric constants.

The camera device1000according to the embodiment may satisfy at least one of Equations 1 to 17. In this case, the camera device1000may have improved optical characteristics and reduce the size of the head part210of the lens barrel200. When the camera device1000satisfies at least one of Equations 1 to 17, the lens barrel200may prevent or minimize a change in the thickness of one region by the lens accommodated therein, resulting in more improved may have reliability. Accordingly, when the camera device1000is inserted into and placed in a member such as a display, the camera device1000has improved reliability and the area occupied by the camera device1000on the surface of the member may be minimized. there is.

Table 3 relates to the items of the equations described above in the camera device1000according to the first to third embodiments, and relates the total track length (TTL), the total focal length (F), Img, and the inclination angle between the connection surface113and the optical axis OA of the optical system100. Also, Table 4 shows result values of Equations 1 to 17 in the camera apparatus1000according to the first to third embodiments. Referring to Table 4, it may be seen that the camera devices1000according to the first to third embodiments satisfy at least one of Equations 1 to 17. In detail, it may be seen that the camera device1000according to the embodiment satisfies all of Equations 1 to 17 above. Accordingly, the camera apparatus1000according to the first to third embodiments may have Modulation Transfer Function (MTF) characteristics, aberration characteristics, and distortion characteristics as shown inFIGS.5to7. In detail,FIG.6is a graph of an aberration diagram of the optical system100according to the embodiment, and is a graph measuring longitudinal spherical aberration, astigmatic field curves, and distortion from left to right. InFIG.6, the X axis may represent a focal length (mm) and distortion (%), and Y axis may represent the height of an image. In addition, a graph of spherical aberration is a graph of light in a wavelength band of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and a graph of astigmatism and distortion is a graph of light in a wavelength band of 546 nm. That is, the camera device1000according to the first to third embodiments may have improved optical characteristics. In addition, the lens barrel200of the camera device1000may effectively reduce the size while ensuring the reliability of the heat part210inserted into a separate substrate. Accordingly, the camera device1000according to the embodiment may be implemented in a small size with improved reliability, and thus may be applied to various substrates.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, and effects illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the invention. In addition, although the above has been described with a focus on the embodiments, these are only examples and do not limit the invention, and those skilled in the art to which the invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be seen that various variations and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the invention as defined in the appended claims.