Optical system, optical device, and camera module including the same

Abstract

An embodiment of the present invention starts with an optical system that includes a first lens group adjacent to the object side and having a first optical axis, a second lens group adjacent to the image side and having a second optical axis, and a first optical path conversion member disposed between the first lens group and the second lens group, wherein the second lens group is movable and has a wide state when the center of the second lens group overlaps with the first optical path conversion member in the second optical axis direction, and has a telephoto state when the center of the second lens group does not overlap with the first optical path conversion member in the second optical axis direction.

Description

[Technical Field]

[0001] The present invention relates to an optical system, an optical device, and a camera module including the same. [Background technology]

[0002] A camera is a device that takes photos or videos of a subject and is attached to mobile devices, drones, vehicles, etc. To improve image quality, a camera module can have an image stabilization (IS) function that corrects or prevents image shake caused by user movement, an autofocus (AF) function that automatically adjusts the distance between the image sensor and lens to align the lens focal length, and a zoom function that increases or decreases the magnification of a distant subject through a zoom lens.

[0003] However, miniaturized camera modules have complex structures that make assembly difficult, and there are problems with brightness or Fno decreasing due to multiple driving parts and miniaturization. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is to provide an optical system, optical device, and camera module that ensure sufficient brightness by providing a sufficiently large lens at the front end of an optical path conversion element (prism) so that the f-number is small.

[0005] Furthermore, the present invention can provide an optical system, an optical device, and a camera module that are simple in structure and easy to assemble.

[0006] Furthermore, the present invention can provide an optical system, an optical device, and a camera module that provide zooming while using only one moving part or driving part.

[0007] The technical problem to be solved by the present invention is to provide an optical system and an optical device that can be applied to an ultra-slim, ultra-compact and high-resolution camera.

[0008] The problems to be solved by the examples are not limited to these, and may also include the objectives and effects that can be grasped from the means for solving the problems and embodiments described below. [Means for solving the problem]

[0009] An optical system according to an embodiment of the present invention includes a first lens group adjacent to the object side and having a first optical axis, a second lens group adjacent to the image side and having a second optical axis, and a first optical path conversion member disposed between the first lens group and the second lens group, wherein the second lens group is movable and has a wide state when the center of the second lens group overlaps with the first optical path conversion member in the second optical axis direction, and has a tele state when the center of the second lens group does not overlap with the first optical path conversion member in the second optical axis direction.

[0010] In the telephoto state, the first lens group can overlap with the second lens group in the second optical axis direction.

[0011] The ratio of the focal length to the F-number (fno) may be 5 to 7 in at least one of the telephoto state and the wide-angle state.

[0012] The distance between the first lens group and the second lens group may be 5 mm or more.

[0013] In the wide state, the distance between the image side surface of the outermost lens of the second lens group and the image sensor may be 5 mm or more.

[0014] In the wide state, the second lens group is inserted and can overlap the first optical path changing member and the second optical axis.

[0015] In the wide state, the second lens group may be inserted so that at least a portion of the first optical path changing member does not overlap with the second optical axis.

[0016] The ratio of TTL (Total track length) to BFL (Back focus length) can be 4-10.

[0017] The optical system according to the embodiment includes a first lens group, a second lens group spaced apart from the first lens group, and a first optical path conversion member disposed between the first lens group and the second lens group, and has an F-number of 3.5 or less when light passes through the first lens group but not the second lens group.

[0018] The first lens group may be disposed in a thickness direction of the first optical path changing member. [Effects of the Invention]

[0019] According to an embodiment of the present invention, by providing a lens of sufficient size at the front end of the optical path conversion member (prism), it is possible to realize an optical system, optical device, and camera module that has a small f-number and therefore sufficient brightness.

[0020] Furthermore, the present invention can realize an optical system, an optical device, and a camera module that are simple in structure and easy to assemble.

[0021] Furthermore, the present invention can realize an optical system, an optical device, and a camera module that provide zooming while using only one moving part or driving part.

[0022] Furthermore, the present invention can provide an optical system and an optical device that achieves zoom magnification while ensuring sufficient space for an optical path conversion member.

[0023] The technical problem to be solved by the present invention is to realize an optical system and an optical device that can be applied to an ultra-slim, ultra-compact and high-resolution camera.

[0024] The various beneficial advantages and effects of the present invention are not limited to the above, but will be more easily understood in the course of describing specific embodiments of the present invention. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a perspective view of a camera module according to an embodiment.

[0026] [Figure 2] FIG. 1 is a conceptual diagram of an optical device according to a first embodiment.

[0027] [Figure 3] FIG. 2 is a top view of the optical device according to the first embodiment in a first state.

[0028] [Figure 4] FIG. 2 is a top view of the optical device according to the first embodiment in a second state.

[0029] [Figure 5] FIG. 10 is a conceptual diagram of an optical device according to a second embodiment.

[0030] [Figure 6] FIG. 10 is a top view of the optical device according to the second embodiment in a second state.

[0031] [Figure 7] FIG. 10 is a top view of an optical device according to a second embodiment in a first state.

[0032] [Figure 8a] FIG. 1 is a conceptual diagram of an optical system according to a first example.

[0033] [Figure 8b] FIG. 1 is a cross-sectional view of an optical system according to a first example in a wide state.

[0034] [Figure 9a]1 is a graph showing measurements of spherical aberration, astigmatic field curves, and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the wide state of the optical system according to the first example.

[0035] [Figure 9b] 1 is a diffraction MTF graph in a wide state of the optical system according to the first example.

[0036] [Figure 10] FIG. 1 is a cross-sectional view of an optical system according to a first embodiment in a telephoto state.

[0037] [Figure 11a] 10 is a graph showing measurements of spherical aberration, astigmatic field curves, and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the tele state of the optical system according to the first example.

[0038] [Figure 11b] 1 is a diffraction MTF graph in a telephoto state of the optical system according to the first example.

[0039] [Figure 12] FIG. 10 is a cross-sectional view of the optical system according to the second embodiment in a wide state.

[0040] [Figure 13]10 is a graph showing measurements of spherical aberration, astigmatic field curves, and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the wide state of the optical system according to the second example.

[0041] [Figure 14] FIG. 10 is a cross-sectional view of the optical system according to the second embodiment in a telephoto state.

[0042] [Figure 15] 10 is a graph showing measurements of spherical aberration, astigmatic field curves, and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the tele state of the optical system according to the second embodiment.

[0043] [Figure 16] FIG. 10 is a cross-sectional view of the optical system according to the third example in a wide state.

[0044] [Figure 17] 10 is a graph showing measurements of spherical aberration, astigmatic field curves, and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the wide state of the optical system according to the third example.

[0045] [Figure 18] FIG. 10 is a cross-sectional view of the optical system according to the third embodiment in a telephoto state.

[0046] [Figure 19]10 is a graph showing measurements of spherical aberration, astigmatic field curves, and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the tele state of the optical system according to the third example.

[0047] [Figure 20] 1 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied;

[0048] [Figure 21] 1 is a perspective view of a vehicle to which a camera module according to an embodiment is applied; DETAILED DESCRIPTION OF THE INVENTION

[0049] The present invention can be modified in various ways and can have various embodiments, and a specific embodiment will be described by way of example in the drawings. However, it is not intended to limit the present invention to the specific embodiment, and it should be understood that the present invention includes all modifications, equivalents, and alternatives that fall within the spirit and technical scope of the present invention.

[0050] Terms including ordinal numbers, such as "second," "first," etc., may be used to describe various components, but the components are not limited by the terms. Terms are used only to distinguish one component from another. For example, a second component may be designated as a "first component," and similarly, a first component may be designated as a "second component," without departing from the scope of the present invention. The term "and / or" includes a combination of multiple related listed items or any of multiple related listed items.

[0051] When a component is said to be "coupled" or "connected" to another component, it should be understood that it may be directly coupled or connected to the other component, but that there may be other components in between. Conversely, when a component is said to be "directly coupled" or "directly connected" to another component, it should be understood that there are no other components in between.

[0052] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. The singular expressions include the plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprise" or "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood not to preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0053] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0054] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, and the same or corresponding elements will be given the same reference numerals regardless of the drawing reference numerals, and redundant description thereof will be omitted.

[0055] FIG. 1 is a perspective view of a camera module according to an embodiment, FIG. 2 is a conceptual diagram of an optical device according to a first embodiment, FIG. 3 is a top view of the optical device according to the first embodiment in a first state, and FIG. 4 is a top view of the optical device according to the first embodiment in a second state.

[0056] 1, a camera module 1000 according to the embodiment may include a cover CV, a first camera actuator 1100, a second camera actuator 1200, and a circuit board 1300. Here, the first camera actuator 1100 may be used interchangeably with the first actuator, and the second camera actuator 1200 may be used interchangeably with the second actuator.

[0057] The cover CV can cover the first camera actuator 1100 and the second camera actuator 1200. The cover CV can improve the coupling force between the first camera actuator 1100 and the second camera actuator 1200.

[0058] Furthermore, the cover CV may be made of a material that blocks electromagnetic waves, thereby easily protecting the first camera actuator 1100 and the second camera actuator 1200 within the cover CV.

[0059] The cover CV may have a structure that partially protrudes along the first direction (X-axis direction) due to the first lens group of the first camera actuator 1100. Also, the cover CV may have a structure that partially protrudes along a direction perpendicular to the second direction, for example, a third direction (Y-axis direction), in consideration of the movement of the second lens group of the second camera actuator 1200.

[0060] The first camera actuator 1100 may be an OIS (Optical Image Stabilizer) actuator. For example, the first camera actuator 1100 may change the optical axis O.

[0061] The first camera actuator 1100 may include a fixed focal length lens disposed in a predetermined lens barrel (not shown). A fixed focal length lens may also be referred to as a "single focal length lens" or "single lens."

[0062] The first camera actuator 1100 can change the path of light. As an example, the first camera actuator 1100 can change the path of light vertically through an internal optical member or a first optical path conversion member (e.g., a prism or mirror). For example, the first optical path conversion member can change the light from a first direction (X-axis direction) to a second direction (Z-axis direction). Alternatively, the optical member can change the light from a first axis to a second axis. With this configuration, even if the thickness of the mobile terminal is reduced, a lens configuration larger than the thickness of the mobile terminal can be disposed within the mobile terminal through the change in the optical path, thereby enabling magnification, autofocusing (AF), zoom, and OIS functions to be performed. Also, in this specification, distance may correspond to the length of the optical path.

[0063] However, the present invention is not limited to this, and the camera module may change the optical path vertically or at a predetermined angle multiple times.

[0064] The second camera actuator 1200 may be disposed at the rear end of the first camera actuator 1100. The second camera actuator 1200 may be coupled to the first camera actuator 1100. The coupling therebetween may be achieved in various ways.

[0065] The second camera actuator 1200 may also be a zoom actuator. For example, the second camera actuator 1200 may support one or more lenses and perform the function of moving the lenses in response to a control signal from a predetermined control unit.

[0066] One or more lenses can be moved independently or individually in a direction perpendicular to the first direction (X-axis direction). For example, in a camera module, the second direction (Z-axis direction) can correspond to the optical axis direction. The second camera actuator 1200 can move the second lens group G2 in the optical axis direction or in directions perpendicular to the first direction (X-axis direction) (second and third directions) to insert or remove the second lens group G2 into or from the optical path. Alternatively, the second lens group G2 can be moved in the optical axis direction or in the first direction (X-axis direction) to insert or remove the second lens group G2 into or from the optical path. The following description will be based on the movement or insertion / removal of the second lens group G2 in the third direction (Y-axis direction).

[0067] The circuit board 1300 may be disposed at the rear end of the second camera actuator 1200. The circuit board 1300 may be electrically connected to the second camera actuator 1200 and the first camera actuator 1100. There may also be a plurality of circuit boards 1300.

[0068] The camera module according to the embodiment may be a single camera module or multiple camera modules, for example, multiple camera modules may include a first camera module and a second camera module.

[0069] The first camera module may include a single actuator or multiple actuators. For example, the first camera module may include a first camera actuator 1100 and a second camera actuator 1200.

[0070] The second camera module may be disposed in a predetermined housing (not shown) and may include an actuator (not shown) capable of driving the lens unit. The actuator may be a voice coil motor, a microactuator, a silicon actuator, or the like, and may be variously applied, such as an electrostatic type, a thermal type, a bimorph type, or an electrostatic force type, but is not limited thereto. In addition, in this specification, a camera actuator may be referred to as an actuator, etc. Furthermore, a camera module consisting of multiple camera modules may be mounted in various electronic devices such as a mobile terminal. Furthermore, an actuator may be a device that moves or tilts a lens or optical member. However, hereinafter, an actuator will be described as a concept including a lens or an optical member. Furthermore, an actuator may be referred to as a "lens moving device," a "lens moving device," an "optical member moving device," an "optical member moving device," etc.

[0071] 2 to 4, the optical device according to the first embodiment can include a first lens group G1, a first optical path changing member L5, and a second lens group G2.

[0072] The optical device according to the first embodiment may further include an image sensor IS and a circuit board 1300. Here, the image sensor IS is disposed on the optical path and can receive light. The image sensor IS can convert the received light into an electrical signal and transmit it to the outside through the circuit board or the like.

[0073] Furthermore, the optical device according to the first embodiment may include the first camera actuator, second camera actuator, etc. For example, the first camera actuator may include the first lens group G1 and the first optical path changing member L5. The second camera actuator may include the second lens group G2. Hereinafter, the optical device according to this embodiment will be described based on the first lens group G1, the first' optical path changing member L5, the second lens group G2, and the image sensor IS.

[0074] First, in the optical device according to the embodiment, the first optical path conversion member L5 can change the optical path of incident light incident from the object side along a first direction (X-axis direction) to a second direction. Such a first optical path conversion member L5 can be referred to as a "fifth lens." Consequently, the first optical path conversion member can be referred to as a "reflecting member," etc. Consequently, the first lens group G1 can have a first optical axis. That is, the first optical axis can correspond to the central axis of the first lens group G1. Consequently, the first optical axis can correspond to the first direction or the X-axis direction. And the second lens group G2 can have a second optical axis. That is, the second optical axis can correspond to the central axis of the second lens group G2. The second optical axis can correspond to the second direction (Z-axis direction).

[0075] As a result, light can be incident on the first optical path converting member L5 along a first direction (X-axis direction) and can be reflected and then emitted in a second direction (Z-axis direction). To this end, the first optical path converting member L5 may include a prism, a reflecting mirror, etc.

[0076] The first lens group G1 may be located between the first optical path changing member L5 and the object side. Alternatively, the first lens group G10 may be located at the front end of the first optical path changing member L5. The first lens group G1 may also be disposed adjacent to the object side. In this specification, the terms "front end" and "front" refer to the direction toward the object side on the optical path. The terms "rear end" and "rear" refer to the direction opposite the object side on the optical path or toward the image sensor.

[0077] The first lens group G1 is located on the object side of the first optical path changing member L5 and can include at least one lens.

[0078] The first lens group G1 can be arranged in the thickness direction or the first direction of the first optical path changing member.

[0079] For example, the first lens group G1 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 on the optical path, which may be arranged sequentially from the object side to the image side (corresponding to the image sensor).

[0080] Furthermore, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can be located above the first optical path conversion member L5.

[0081] The second lens group G2 may be disposed between the first optical path converting member L5 and the image sensor IS. The second lens group G2 may include at least one lens. For example, the second lens group G2 may include a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. The sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 may be disposed sequentially along the optical axis direction or the second direction (Z-axis direction).

[0082] The second lens group G2 can be inserted into or removed from the optical path as described above. In other words, the second lens group G2 can be positioned inside or outside the optical path by various driving units. For example, the driving unit can include an actuator (not shown). The actuator can be a voice coil motor, a micro-actuator, a silicon actuator, or the like, and can be applied in various ways, such as an electrostatic type, a thermal type, a bimorph type, or an electrostatic force type, but is not limited thereto.

[0083] The second lens group G2 can move in a direction perpendicular to the second direction (Z-axis direction). For example, the second lens group G2 can move in the first direction (X-axis direction). The second lens group G2 can also move in the third direction (Y-axis direction). In this case, the length of the camera module or optical device in the first direction may not increase with the movement of the second lens group G2. In other words, the size or thickness of the camera module or optical device can be reduced while still performing zoom or magnification. As a result, the optical device and camera module according to the embodiment can have a compact structure while providing high magnification.

[0084] Furthermore, at least one lens in the first lens group G1 may have a larger area than the first optical path converting member L5. For example, the length W1 of at least one lens in the first lens group G1 in the second direction (Z-axis direction) may be larger than the length W2 of the first optical path converting member L5 in the second direction (Z-axis direction). For example, the length of at least one lens among the first lens L1, second lens L2, third lens L3, and fourth lens L4 in the second direction (Z-axis direction) may be larger than the length W2 of the first optical path converting member L5 in the second direction (Z-axis direction).

[0085] At least one lens of first lens group G1 may have a length D1 in the third direction (Y-axis direction) that is greater than the length of first optical path conversion member L5 in the third direction (Y-axis direction). For example, at least one lens among first lens L1, second lens L2, third lens L3, and fourth lens L4 may have a length in the third direction (Y-axis direction) that is greater than the length of first optical path conversion member L5 in the third direction (Y-axis direction).

[0086] This configuration allows the F-number of at least one lens in the first lens group G1 to be varied in various ways. For example, the F-number of at least one lens in the first lens group G1 can be easily reduced.

[0087] Furthermore, at least one lens in the first lens group G1 may have a circular edge. For example, at least a portion of the edge of at least one lens in the first lens group G1 may not be flat in a direction perpendicular to the first direction. In other words, at least one lens in the first lens group G1 may not be D-cut.

[0088] With this configuration, the optical device and camera module according to the embodiment can provide bright optical performance.

[0089] Furthermore, at least one of the first lens group G1 and the first optical path converting member L5 can move or tilt in a direction perpendicular to the first direction (X-axis direction). For example, the first lens group G1 can move in a direction perpendicular to the first direction (X-axis direction). Or, the first optical path converting member L5 can tilt in a direction perpendicular to the first direction (X-axis direction). This allows the first camera actuator 110 to easily perform an image stabilization function.

[0090] As described above, the length W1 of the first lens group G1 in the second direction (Z-axis direction) may be greater than the length W2 of the first optical path conversion member L5 in the second direction (Z-axis direction).

[0091] The length W3 of the second lens group G2 in the second direction (Z-axis direction) may be greater than the length of the first optical path changing member L5 in the second direction (Z-axis direction). Also, the length W3 of the second lens group G2 in the second direction (Z-axis direction) may be less than or equal to the length W1 of the first lens group G1 in the second direction (Z-axis direction).

[0092] The ratio of the length WL of the optical device and camera module in the second direction (Z-axis direction) to the sum of the length W1 of the first lens group G1 in the second direction (Z-axis direction) and the length W3 of the second lens group G2 in the second direction (Z-axis direction) can be 1:0.8 to 1:0.95. This allows the optical device and camera module to be compact, yet have a structure that allows the image sensor to be miniaturized.

[0093] As an example, the optical device may be in a telephoto or wide angle state depending on the configuration of the second lens group G2. Herein, the first state may be the wide state and the second state may be the tele state.

[0094] In the first state, the second lens group G2 can be disposed on the optical path, i.e., the second lens group G2 can overlap the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction in the first state.

[0095] Furthermore, in the first state, the second lens group G2 can at least partially overlap with the first lens group G1. For example, in the first state, the second lens group G2 can have an overlapping area OV where it overlaps with the first lens group G1 in the first direction (X-axis direction). This configuration allows for the miniaturization of the optical device and camera module. Furthermore, zooming can be easily performed with a single moving group.

[0096] In the second state, the second lens group G2 does not have to be positioned on the optical path. That is, the second lens group G2 does not have to at least partially overlap with the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction in the second state. Alternatively, the first lens group G1 may overlap with the second lens group G2 in the second optical axis direction or the second direction (Z-axis direction). In this case, the second lens group G2 may move upward or in the first optical axis direction.

[0097] However, the second lens group G2 may partially overlap the first optical path converting member L5 in the second direction (Z-axis direction) at the edge region in the second state, thereby allowing the camera module to have a compact structure while still performing a magnification function.

[0098] For example, the cover CV may have a protruding structure on one side to facilitate insertion and removal of the second lens group G2. The second lens group G2 may also have a structure that protrudes partially in the second direction relative to the first lens group G1 in the second state. The length D3 of this protruding structure in the second direction (Y-axis direction) may be smaller than the length D2 of the second lens group G2 in the second direction (Y-axis direction). This allows the optical device and camera module to provide improved space efficiency. Furthermore, the length D1 of the first lens group G1 in the second direction may be greater than the length D2 of the second lens group G2 in the second direction (Y-axis direction). This allows the optical device to provide extremely bright optical performance, as described above.

[0099] Furthermore, the length l1 of the first lens group G1 in the first direction (X-axis direction) may be smaller than the length l2 of the first optical path conversion member L5 in the first direction (X-axis direction), thereby minimizing the thickness of the optical device and the camera module while providing bright light.

[0100] Consequently, the length of the second lens group G2 in the first direction can also be equal to or less than the length l2 in the first direction (X-axis direction) of the first optical path conversion member L5.

[0101] FIG. 5 is a conceptual diagram of the optical device according to the second embodiment, FIG. 6 is a top view of the optical device according to the second embodiment in a second state, and FIG. 7 is a top view of the optical device according to the second embodiment in a first state.

[0102] 5 to 7, the optical device according to the second embodiment can include a first lens group G1, a first optical path changing member L5, a second lens group G2, and a second optical path changing member L10.

[0103] The optical device according to the second embodiment may further include an image sensor IS and a circuit board 1300. Here, the image sensor IS is disposed on the optical path and can receive light. The image sensor IS can convert the received light into an electrical signal and transmit it to the outside through the circuit board or the like.

[0104] Furthermore, the optical device according to the second embodiment may include the first camera actuator, second camera actuator, etc. described above. For example, the first camera actuator may include the first lens group G1 and the first optical path changing member L5. The second camera actuator may include the second lens group G2. The second camera actuator may also include the second optical path changing member L10. Hereinafter, the optical device according to this embodiment will be described based on the first lens group G1, the first' optical path changing member L5, the second lens group G2, and the image sensor IS.

[0105] First, in the optical device according to the embodiment, the first optical path changing member L5 can change the optical path of incident light, which is incident from the object side along the first direction (X-axis direction), to the second direction. Such a first reflecting member L5 can be called a “fifth lens.”

[0106] As a result, light can be incident on the first optical path converting member L5 along a first direction (X-axis direction) and can be emitted in a second direction (Z-axis direction) after being reflected by the first optical path converting member L5. To this end, the first optical path converting member L5 may include a prism, a reflecting mirror, etc.

[0107] The first lens group G1 may be located between the first optical path changing member L5 and the object side. Alternatively, the first lens group G10 may be located at the front end of the first optical path changing member L5. In this specification, the terms "front end" and "front" refer to the direction toward the object side on the optical path. Additionally, the terms "rear end" and "rear" refer to the direction opposite to the object side on the optical path or toward the image sensor.

[0108] The first lens group G1 is located on the object side of the first optical path changing member L5 and can include at least one lens.

[0109] For example, the first lens group G1 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 on the optical path, which may be arranged sequentially from the object side to the image side (corresponding to the image sensor).

[0110] Furthermore, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can be located above the first optical path conversion member L5.

[0111] The second lens group G2 may be disposed between the first optical path converting member L5 and the image sensor IS. The second lens group G2 may include at least one lens. For example, the second lens group G2 may include a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. The sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 may be disposed sequentially along the optical axis direction or the second direction (Z-axis direction).

[0112] The second lens group G2 can be inserted into or removed from the optical path as described above. In other words, the second lens group G2 can be positioned inside or outside the optical path by various driving units. For example, the driving unit can include an actuator (not shown). The actuator can be a voice coil motor, a micro-actuator, a silicon actuator, or the like, and can be applied in various ways, such as an electrostatic type, a thermal type, a bimorph type, or an electrostatic force type, but is not limited thereto.

[0113] The second lens group G2 can move in a direction perpendicular to the second direction (Z-axis direction). For example, the second lens group G2 can move in the first direction (X-axis direction). The second lens group G2 can also move in the third direction (Y-axis direction). In this case, the length of the camera module or optical device in the first direction may not increase with the movement of the second lens group G2. In other words, the size or thickness of the camera module or optical device can be reduced while still performing zoom or magnification. As a result, the optical device and camera module according to the embodiment can have a compact structure while providing high magnification.

[0114] Furthermore, at least one lens in the first lens group G1 may have a larger area than the first optical path converting member L5. For example, the length W1 of at least one lens in the first lens group G1 in the second direction (Z-axis direction) may be larger than the length W2 of the first optical path converting member L5 in the second direction (Z-axis direction). For example, the length of at least one lens among the first lens L1, second lens L2, third lens L3, and fourth lens L4 in the second direction (Z-axis direction) may be larger than the length W2 of the first optical path converting member L5 in the second direction (Z-axis direction).

[0115] At least one lens of first lens group G1 may have a length D1 in the third direction (Y-axis direction) that is greater than the length of first optical path conversion member L5 in the third direction (Y-axis direction). For example, at least one lens among first lens L1, second lens L2, third lens L3, and fourth lens L4 may have a length in the third direction (Y-axis direction) that is greater than the length of first optical path conversion member L5 in the third direction (Y-axis direction).

[0116] This configuration allows the F-number of at least one lens in the first lens group G1 to be varied in various ways. For example, the F-number of at least one lens in the first lens group G1 can be easily reduced.

[0117] Furthermore, at least one lens in the first lens group G1 may have a circular edge. For example, at least a portion of the edge of at least one lens in the first lens group G1 may not be flat in a direction perpendicular to the first direction. In other words, at least one lens in the first lens group G1 may not be D-cut.

[0118] With this configuration, the optical device and camera module according to the embodiment can provide bright optical performance.

[0119] Furthermore, at least one of the first lens group G1 and the first optical path converting member L5 can move or tilt in a direction perpendicular to the first direction (X-axis direction). For example, the first lens group G1 can move in a direction perpendicular to the first direction (X-axis direction). Or, the first optical path converting member L5 can tilt in a direction perpendicular to the first direction (X-axis direction). This allows the first camera actuator 110 to easily perform an image stabilization function.

[0120] As described above, the length W1 of the first lens group G1 in the second direction (Z-axis direction) may be greater than the length W2 of the first optical path conversion member L5 in the second direction (Z-axis direction).

[0121] The length W3 of the second lens group G2 in the second direction (Z-axis direction) may be greater than the length of the first optical path changing member L5 in the second direction (Z-axis direction). Also, the length W3 of the second lens group G2 in the second direction (Z-axis direction) may be less than or equal to the length W1 of the first lens group G1 in the second direction (Z-axis direction).

[0122] The ratio of the length WL of the optical device and camera module in the second direction (Z-axis direction) to the sum of the length W1 of the first lens group G1 in the second direction (Z-axis direction) and the length W3 of the second lens group G2 in the second direction (Z-axis direction) can be 1:0.8 to 1:0.95. This allows the optical device and camera module to be compact, yet have a structure that allows the image sensor to be miniaturized.

[0123] As an example, the optical device may be in a telephoto or wide angle state depending on the configuration of the second lens group G2. Herein, the first state may be wide and the second state may be tele.

[0124] In the first state, the second lens group G2 can be disposed on the optical path, i.e., the second lens group G2 can overlap the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction in the first state.

[0125] Furthermore, in the first state, the second lens group G2 can at least partially overlap with the first lens group G1. For example, in the first state, the second lens group G2 can have an overlapping area OV where it overlaps with the first lens group G1 in the first direction (X-axis direction). This configuration allows for the miniaturization of the optical device and camera module. Furthermore, zooming can be easily performed with a single moving group.

[0126] In the second state, the second lens group G2 does not have to be disposed on the optical path, i.e., the second lens group G2 does not have to at least partially overlap with the first optical path changing member L5 in the second direction (Z-axis direction) or the optical axis direction in the second state.

[0127] However, the second lens group G2 may partially overlap the first optical path converting member L5 in the second direction (Z-axis direction) at the edge region in the second state, thereby enabling the camera module to have a compact structure while still performing a magnification function.

[0128] For example, the cover CV may have a protruding structure on one side to facilitate insertion and removal of the second lens group G2. The second lens group G2 may also have a structure that protrudes partially in the second direction relative to the first lens group G1 in the second state. The length D3 of this protruding structure in the second direction (Y-axis direction) may be smaller than the length D2 of the second lens group G2 in the second direction (Y-axis direction). This allows the optical device and camera module to provide improved space efficiency. Furthermore, the length D1 of the first lens group G1 in the second direction may be greater than the length D2 of the second lens group G2 in the second direction (Y-axis direction). This allows the optical device to provide extremely bright optical performance, as described above.

[0129] Furthermore, the length l1 of the first lens group G1 in the first direction (X-axis direction) may be smaller than the length l2 of the first optical path conversion member L5 in the first direction (X-axis direction), thereby minimizing the thickness of the optical device and the camera module while providing bright light.

[0130] Consequently, the length of the second lens group G2 in the first direction can also be equal to or less than the length l2 in the first direction (X-axis direction) of the first optical path conversion member L5.

[0131] As such, the description of the first lens group G1, the first optical path changing member L5, and the second lens group G2 in the optical device according to the first embodiment can be applied in the same manner.

[0132] Moreover, the optical device according to the second embodiment can further include a second optical path changing member L10 disposed between the second lens group G2 and the image sensor IS.

[0133] The second optical path conversion member L10 can change the optical path of incident light incident along the second direction (Z-axis direction) to a direction perpendicular to the second direction (e.g., the first direction (X-axis direction)). Such a second optical path conversion member L10 can be referred to as a "tenth lens."

[0134] As a result, light can be incident on the second optical path changing member L10 in the second direction (Z-axis direction) and, after reflection, can be emitted in the first direction (X-axis direction). To this end, the first optical path changing member L5 can include a prism, a reflecting mirror, etc. Furthermore, the image sensor IS can be miniaturized through reflection by the second optical path changing member L10.

[0135] Furthermore, in the optical devices according to the first and second embodiments, the first lens group G1, the first optical path changing member L5, the second lens group G2, and the second optical path changing member L10 can move as a unit, thereby enabling autofocusing to be performed.

[0136] In addition, the second optical path changing member L10 can improve the degree of freedom of the position of the image sensor IS or the degree of freedom of the electronic device.

[0137] 8a is a conceptual diagram of the optical system according to the first embodiment, FIG. 8b is a cross-sectional view of the optical system according to the first embodiment in a wide state, FIG. 9a is a graph of measurements of spherical aberration (Longitudinal Spherical Aberration), astigmatism (Astigmatic Field Curves), and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm for the optical system according to the first embodiment in a wide state, FIG. 9b is a diffraction MTF graph of the optical system according to the first embodiment in a wide state, FIG. 10 is a cross-sectional view of the optical system according to the first embodiment in a telephoto state, and FIG. 11a is a graph of spherical aberration (Longitudinal Spherical Aberration), astigmatism (Astigmatic Field Curves), and distortion for light of wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm for the optical system according to the first embodiment in a telephoto state. 11b is a diffraction MTF graph in the telephoto state of the optical system according to the first embodiment.

[0138] 8a, as described above, the first lens group G1 may be located above the first optical path changing member L5, and the second optical path changing member L10 may or may not be present, as in the first and second embodiments.

[0139] The first optical path changing member L5 changes the optical path, and the second optical path changing member L10 also changes the optical path. Reflecting this, when determining optical performance, as shown in Figures 8b to 19, the first optical path changing member L5 and the second optical path changing member L10 correspond to members with no curvature. Therefore, the following illustrations will be based on light transmission, omitting reflection by the first optical path changing member L5 and the second optical path changing member L10. However, even though the first optical path changing member L5 and the second optical path changing member L10 are illustrated as transmitting light, as described above, it should be understood that the first optical path changing member L5 and the second optical path changing member L10 actually change the optical path.

[0140] Further, the optical system described below may include the first lens group G1, first optical path changing member L5, second lens group G2, second optical path changing member L10, and image sensor IS. Further, the optical system may further include a filter F disposed between the second optical path changing member L10 and the image sensor IS. The filter F may be made of glass or the like. The filter F may transmit or block light of a specific wavelength. The filter F may also prevent foreign matter from entering the image sensor IS. Therefore, the optical device may include some or all of the various optical systems described below. The camera module may also include the various optical systems described below. The optical systems of FIGS. 8b to 19 will be described below based on this.

[0141] Referring to FIG. 8b, the optical system 10A of the first embodiment includes a first lens group G1, a first optical path conversion member L5, a second lens group G2, and a second optical path conversion member L10, which are arranged sequentially from the object side to the image side.

[0142] The first optical path changing member L5 will be referred to as the fifth lens L5 below. The fifth lens L5 may include a prism. The second optical path changing member L10 will be referred to as the tenth lens L10 below. The tenth lens L10 may include a prism.

[0143] According to an embodiment of the present invention, the first lens group G1 may include at least one lens, and may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially on the optical path.

[0144] The second lens group G2 can include at least one lens. As an example, the second lens group G2 can include a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. As described above, zooming can be achieved by inserting or removing the second lens group G2. Therefore, the first lens group G1 is not involved in zooming and can be fixed.

[0145] By moving the second lens group G2, the zooming of the optical system 10A can be varied between 1x and 10x. For example, in the wide-angle position, the optical system can provide a magnification of 1x, and in the telephoto position, the optical system can provide a magnification of 5x.

[0146] According to an embodiment of the present invention, the first lens group G1 may include a plurality of lenses having different refractive powers. The lens disposed on the image side of the plurality of lenses included in the first lens group G1 may have a positive (+) refractive power. The lens disposed on the object side of the plurality of lenses included in the first lens group G1 may have a negative (-) refractive power.

[0147] According to an embodiment, the first lens group G1 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged in this order from the object side to the image side. Among these, the first lens L1 may have positive refractive power, the second lens L2 may have positive refractive power, the third lens L3 may have positive refractive power, and the fourth lens L4 may have negative refractive power.

[0148] According to an embodiment of the present invention, the second lens group G2 may include a plurality of lenses having different refractive powers. Of the plurality of lenses included in the second lens group G2, the lens located on the image side may have positive (+) refractive power. Of the plurality of lenses included in the second lens group G2, the lens located on the object side may have positive (+) refractive power.

[0149] According to an embodiment, the second lens group G2 may include a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 arranged in sequence from the object side (or object side) to the image side. Among these, the sixth lens L6 may have positive refractive power, the seventh lens L7 may have negative refractive power, the eighth lens L8 may have negative refractive power, and the ninth lens L9 may have positive refractive power.

[0150] Furthermore, the lenses included in the first lens group G1 and the second lens group G2 may be made of plastic or glass material.

[0151] Tables 1 and 2 below show the optical characteristics of the lenses included in the optical system according to an embodiment of the present invention, and Tables 3 and 4 show the conic constants and aspherical coefficients of the lenses included in the optical system according to an embodiment of the present invention.

[0152] [Table 1]

[0153] *The object side is the thickness of the lens, and the image side is the distance to the next element. Nd is the refractive index, and Vd is the Abbe number (dispersion). This can be applied equally to the following:

[0154] [Table 2]

[0155] [Table 3]

[0156] [Table 4]

[0157] In Table 1, thickness is measured in mm. Table 1 discloses the center thickness (mm) of each lens, the distance between each lens (mm), curvature, refractive index, and Abbe's number. Furthermore, general distances described in the specification are measured in mm. Furthermore, during telephoto zooming, the second lens group G2 is removed, resulting in the removal of lenses 6 through 9. Therefore, the characteristics of the removed lenses 6 through 9 may vary. However, the description of lenses 1 through 5 remains the same. Furthermore, because lenses 6 through 9 are removed, the thickness listed on the image side of lens 5 refers to the distance between lenses 5 and 9, not the distance between lenses 5 and 6. Referring to Table 2, each of lenses 1 through 4 and lenses 6 through 9 may be embodied as a convex or concave shape.

[0158] The first lens L1 may be a lens whose object-side surface S11 bulges toward the object side. The first lens L1 may be a lens whose image-side surface S12 bulges toward the object side. In other words, the object-side surface S11 of the first lens L1 may be concave toward the image side. And the image-side surface S12 of the first lens L1 may be concave toward the image side.

[0159] The second lens L2 may be a lens whose object-side surface L21 bulges toward the object side. The second lens L2 may be a lens whose image-side surface L22 is concave toward the object side. Convex and concave lenses listed in Table 2 are listed with the object side as the reference.

[0160] As shown in the drawings, the thickness T1 of the first lens L1 may correspond to the thickness listed on the object-side surface S11 of the first lens L1 in Table 1. The thickness T2 of the second lens L2 may correspond to the thickness listed on the object-side surface S21 of the second lens L2 in Table 1. The thickness T3 of the third lens L3 may correspond to the thickness listed on the object-side surface S31 of the third lens L3 in Table 1. The thickness T4 of the fourth lens L4 may correspond to the thickness listed on the object-side surface S41 of the fourth lens L4 in Table 1. The thickness T6 of the sixth lens L6 may correspond to the thickness listed on the object-side surface S61 of the sixth lens L6 in Table 1. The thickness T7 of the seventh lens L7 may correspond to the thickness listed on the object-side surface S71 of the seventh lens L7 in Table 1. The thickness T8 of the eighth lens L8 may correspond to the thickness listed on the object-side surface S81 of the eighth lens L8 in Table 1. The thickness T9 of the ninth lens L9 may correspond to the thickness listed on the object-side surface S91 of the ninth lens L9 in Table 1.

[0161] [Table 5]

[0162] [Table 6-1] [Table 6-2] [Table 6-3]

[0163] Table 5 shows the total track length (TTL), effective focal length (EFL), back focus length (BFL), and focal length of the lens of the optical system. The F-number of the entire lens unit is 2 or more, for example, 2.275. The angle FOV as viewed from the camera module may be 20 degrees or less, for example, in the range of 8 to 15 degrees. Here, the angle FOV as viewed from the camera module means half the angle of view. Therefore, it may be 1 / 2 the angle of view of the camera module. Table 6 shows the result values ​​of the optical system of the embodiment for the above mathematical formulas. Referring to Table 6, it can be seen that the optical system according to one embodiment satisfies at least one or more of Formulas 1 to 38.

[0164] Further, ET is the edge thickness of the lens, and nx is the refractive index of the xth lens.

[0165] CA_L#1S# means the object-side effective diameter of the first lens, and CA_L#2S# means the object-side effective area of ​​the second lens. CA_L3S2 means the image-side effective area of ​​the third lens, and CA_L4S1 means the object-side effective area of ​​the fourth lens. d34_CT is the center-to-center (optical axis) distance between the third and fourth lenses, and d34_ET is the edge-to-edge distance between the third and fourth lenses. D910_CT is the center-to-edge (optical axis) distance between the ninth and tenth lenses, and D910_ET is the edge-to-edge distance between the ninth and tenth lenses. L_CT_Max is the maximum lens thickness, and Air_Max is the maximum distance between the lenses. ΣL_CT is the sum of the lens thicknesses, and ΣAir_CT is the sum of the lens separation distances. ΣIndex is the sum of the refractive indices. ΣAbb is the sum of the Abbe numbers for the lenses. Air_Edge_Max is the maximum separation distance between the lens edges, and L_CT_Max is the maximum thickness of the lens. CA_max is the maximum clear aperture, and CA_Aver is the average clear aperture. CA_min is the minimum clear aperture. TD is the distance from the object side surface of the first lens to the image side surface of the tenth lens. F is EFL, and L1R1 is the radius of curvature of the object side surface of the first lens. The f# number indicates the focal length of the lens.

[0166] Furthermore, the optical system according to the embodiment may have an F number smaller than 3.8 in the telephoto state, which means that the optical system can provide bright light.

[0167] In addition, the ratio of focal length to F-number (f / fno) can be 5 to 7 in at least one of the telephoto and wide-angle positions, where f corresponds to EFL. This configuration can provide a low F-number (F#, fno) relative to the focal length.

[0168] In addition, the distance between the first lens group G1 and the second lens group G2 may be 5 mm or more. This ensures sufficient space for the fifth lens or the first optical path changing member. In the wide-angle state, the distance between the image side of the outermost lens of the second lens group and the image sensor may be 5 mm or more. This ensures sufficient space for the second optical path changing member or the tenth lens for changing the optical path. Consequently, the optical system can ensure such space and provide zooming without an additional drive unit that moves the moving group along the optical path.

[0169] Furthermore, in this embodiment, the EFL (Effective Focal Length) is 11.9 at wide and 19.4 at tele. The Fno is 2.27 at wide and 3.71 at tele, and the HFOV is 12.80 at wide and 8.01 at tele. In terms of focal length, the combined focal length (f1-f4) of the first to fourth lenses is 19.4, and the combined focal length (f6-f9) of the sixth to ninth lenses is 7.94.

[0170] 9a and 11a, we can see that the spherical aberration is within -0.05 mm to 0.1 mm from the center to the end of the image sensor regardless of the wavelength. Specifically, we can see that the spherical aberration is within -0.1 mm to 0.1 mm in the wide and telephoto states.

[0171] It can also be seen that the astigmatism is within -0.05mm to 0.05mm from the center to the end of the image sensor regardless of wavelength. Specifically, it can be seen that the astigmatism is within approximately -0.05mm to 0.05mm in the wide and telephoto states.

[0172] It can also be seen that distortion aberration is within -2% to 2% from the center to the edge of the image sensor regardless of wavelength. Specifically, it can be seen that distortion aberration is within approximately -2% to 2% in the wide and telephoto states.

[0173] 9b and 11b, the optical system according to the embodiment of the present invention has a value close to the diffraction limit near the defocus position of 0 [mm] in the wide-angle and telephoto states, respectively. For example, the optical system may have a modulation of 0.5 or more near the defocus position of 0 [mm] in the wide-angle and telephoto states, respectively.

[0174] FIG. 12 is a cross-sectional view of the optical system of Example 2 in a wide state, FIG. 13 is a graph showing measurements of spherical aberration (Longitudinal Spherical Aberration), astigmatism (Astigmatic Field Curves), and distortion for light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm for the optical system of Example 2 in a wide state, FIG. 14 is a cross-sectional view of the optical system of Example 2 in a telephoto state, and FIG. 15 is a graph showing measurements of spherical aberration (Longitudinal Spherical Aberration), astigmatism (Astigmatic Field Curves), and distortion for light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm for the optical system of Example 2 in a telephoto state.

[0175] Hereinafter, the same contents as above can be applied except for the shapes shown in the drawings and the contents described below. Therefore, at least one or more of Formulas 1 to 38 described in Table 6 above can be satisfied in the same way for the optical system 10B according to the second embodiment.

[0176] [Table 7]

[0177] [Table 8]

[0178] [Table 9]

[0179] The unit of thickness is [mm]. Table 8 and other tables disclose the center thickness (mm) of each lens, the distance between each lens (mm), curvature, refractive index, and Abbe's number. Furthermore, general distances described in the specification are in [mm]. Furthermore, during telephoto zooming, the second lens group G2 is removed, so the sixth through ninth lenses are also removed. Therefore, the characteristics of the removed sixth through ninth lenses may change. However, the description of the first through fifth lenses remains the same. Furthermore, because the sixth through ninth lenses are removed, the thickness listed on the image side of the fifth lens refers to the distance between the fifth and ninth lenses, not the distance between the sixth and sixth lenses. Referring to Table 9, the first through fourth lenses and the sixth through ninth lenses may each be embodied as a convex or concave shape.

[0180] The first lens L1 may be a lens whose object-side surface S11 is convex toward the object side, or whose image-side surface S12 is concave toward the object side.

[0181] The second lens L2 may be a lens whose object-side surface L21 bulges toward the object side. The second lens L2 may be a lens whose image-side surface L22 bulges toward the object side.

[0182] As shown in the drawings, the thickness T1 of the first lens L1 may correspond to the thickness listed on the object-side surface S11 of the first lens L1 in Table 1. The thickness T2 of the second lens L2 may correspond to the thickness listed on the object-side surface S21 of the second lens L2 in Table 1. The thickness T3 of the third lens L3 may correspond to the thickness listed on the object-side surface S31 of the third lens L3 in Table 1. The thickness T4 of the fourth lens L4 may correspond to the thickness listed on the object-side surface S41 of the fourth lens L4 in Table 1. The thickness T6 of the sixth lens L6 may correspond to the thickness listed on the object-side surface S61 of the sixth lens L6 in Table 1. The thickness T7 of the seventh lens L7 may correspond to the thickness listed on the object-side surface S71 of the seventh lens L7 in Table 1. The thickness T8 of the eighth lens L8 may correspond to the thickness listed on the object-side surface S81 of the eighth lens L8 in Table 1. The thickness T9 of the ninth lens L9 may correspond to the thickness listed on the object-side surface S91 of the ninth lens L9 in Table 1.

[0183] Furthermore, in this embodiment, the EFL (Effective Focal Length) is 12.0 at wide and 19.4 at tele. The Fno is 2.29 at wide and 3.71 at tele, and the HFOV is 12.68 at wide and 8.03 at tele. In terms of focal length, the combined focal length (f1-f4) of the first to fourth lenses is 19.4, and the combined focal length (f6-f9) of the sixth to ninth lenses is 9.29.

[0184] 13 and 15, it can be seen that the spherical aberration is within -0.1 mm to 0.2 mm from the center to the end of the image sensor regardless of the wavelength. Specifically, it can be seen that the spherical aberration is within -0.1 mm to 0.2 mm in the wide and telephoto states.

[0185] It can also be seen that the astigmatism is within -0.1mm to 0.2mm from the center to the end of the image sensor regardless of wavelength. Specifically, it can be seen that the astigmatism is within approximately -0.1mm to 0.2mm in the wide and telephoto states.

[0186] It can also be seen that distortion aberration is within -2% to 5% from the center to the end of the image sensor regardless of wavelength. Specifically, it can be seen that distortion aberration is within approximately -2% to 5% in the wide and telephoto states. In particular, distortion aberration can be within approximately -1% to 1% in the telephoto state.

[0187] FIG. 16 is a cross-sectional view of the optical system of Example 3 in a wide state, FIG. 17 is a graph of measurements of spherical aberration (Longitudinal Spherical Aberration), astigmatism (Astigmatic Field Curves), and distortion for light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm for the optical system of Example 3 in a wide state, FIG. 18 is a cross-sectional view of the optical system of Example 3 in a telephoto state, and FIG. 19 is a graph of measurements of spherical aberration (Longitudinal Spherical Aberration), astigmatism (Astigmatic Field Curves), and distortion for light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm for the optical system of Example 3 in a telephoto state.

[0188] Hereinafter, the same applies to the above except for the shapes shown in the drawings and the following description, and therefore, at least one or more of Equations 1 to 38 described in Table 6 above can be satisfied in the optical system 10C according to the second embodiment.

[0189] [Table 10]

[0190] [Table 11]

[0191] [Table 12]

[0192] The unit of thickness is [mm]. Table 12 and other tables disclose the center thickness (mm) of each lens, the distance (mm) between each lens, curvature, refractive index, and Abbe's number. Furthermore, general distances described in the specification are in [mm]. Furthermore, during telephoto zooming, the second lens group G2 is removed, so the sixth through ninth lenses are also removed. Therefore, the characteristics of the removed sixth through ninth lenses may change. However, the description of the first through fifth lenses remains the same. Furthermore, because the sixth through ninth lenses are removed, the thickness listed on the image side of the fifth lens refers to the distance between the fifth and ninth lenses, not the distance between the fifth and sixth lenses. Referring to Table 12, the first through fourth lenses and the sixth through ninth lenses may each be embodied as a convex or concave shape.

[0193] The first lens L1 may be a lens whose object-side surface S11 is convex toward the object side, or whose image-side surface S12 is concave toward the object side.

[0194] The second lens L2 may be a lens whose object-side surface L21 bulges toward the object side. The second lens L2 may be a lens whose image-side surface L22 bulges toward the object side.

[0195] As shown in the drawings, the thickness T1 of the first lens L1 may correspond to the thickness listed on the object-side surface S11 of the first lens L1 in Table 1. The thickness T2 of the second lens L2 may correspond to the thickness listed on the object-side surface S21 of the second lens L2 in Table 1. The thickness T3 of the third lens L3 may correspond to the thickness listed on the object-side surface S31 of the third lens L3 in Table 1. The thickness T4 of the fourth lens L4 may correspond to the thickness listed on the object-side surface S41 of the fourth lens L4 in Table 1. The thickness T6 of the sixth lens L6 may correspond to the thickness listed on the object-side surface S61 of the sixth lens L6 in Table 1. The thickness T7 of the seventh lens L7 may correspond to the thickness listed on the object-side surface S71 of the seventh lens L7 in Table 1. The thickness T8 of the eighth lens L8 may correspond to the thickness listed on the object-side surface S81 of the eighth lens L8 in Table 1. The thickness T9 of the ninth lens L9 may correspond to the thickness listed on the object-side surface S91 of the ninth lens L9 in Table 1.

[0196] Furthermore, in this embodiment, the EFL (Effective Focal Length) is 11.9 at wide angle and 20.5 at telephoto. The Fno is 1.99 at wide angle and 3.42 at telephoto, and the HFOV is 12.73 at wide angle and 7.57 at telephoto. In terms of focal length, the combined focal length (f1-f4) of the first through fourth lenses is 20.59, and the combined focal length (f6-f9) of the sixth through ninth lenses is 8.35. Referring to FIGS. 17 and 19, it can be seen that the spherical aberration is within -0.05 mm to 0.05 mm from the center to the end of the image sensor regardless of wavelength. Specifically, it can be seen that the spherical aberration is within -0.05 mm to 0.05 mm in both the wide angle and telephoto positions.

[0197] It can also be seen that the astigmatism is within -0.05mm to 0.05mm from the center to the end of the image sensor regardless of wavelength. Specifically, it can be seen that the astigmatism is within approximately -0.05mm to 0.05mm in the wide and telephoto states.

[0198] It can also be seen that distortion aberration is within -1% to 2.5% from the center to the end of the image sensor regardless of wavelength. Specifically, it can be seen that distortion aberration is within approximately -1% to 2.5% in the wide and telephoto positions. In particular, distortion aberration can be within approximately -0.5% to 1.5% in the telephoto position.

[0199] FIG. 20 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied.

[0200] As shown in FIG. 20, the mobile terminal 1500 of the embodiment may include a camera module 1000, a flash module 1530, and an autofocus device 1510 provided on the rear surface.

[0201] The camera module 1000 may include an image capture function and an autofocus function, for example, the camera module 1000 may include an image-based autofocus function.

[0202] The camera module 1000 processes still or moving image frames obtained by an image sensor in a shooting state or a video call state.

[0203] The processed image frame can be displayed on a predetermined display unit or stored in a memory.A camera (not shown) can also be disposed on the front of the mobile terminal body.

[0204] For example, the camera module 1000 may include a first camera module 1000 and a second camera module 1000, and the first camera module 10000 may be capable of implementing OIS along with AF or zoom functions.

[0205] The flash module 1530 may include a light emitting element for emitting light therein, and may be activated by the camera of the mobile terminal or by user control.

[0206] The autofocus device 1510 may include one in a package of surface emitting laser elements as the light emitter.

[0207] The autofocus device 1510 may include an autofocus function using a laser. The autofocus device 1510 may be used primarily in conditions where the image-based autofocus function of the camera module 1000 is degraded, such as in close proximity of less than 10 m or in dark environments.

[0208] The autofocus device 1510 may include a light emitting portion including a vertical cavity surface emitting laser (VCSEL) semiconductor device, and a light receiving portion such as a photodiode that converts optical energy into electrical energy.

[0209] FIG. 21 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

[0210] For example, FIG. 21 is an external view of a vehicle equipped with a vehicle driving assistance device to which a camera module 1000 according to an embodiment is applied.

[0211] 21, a vehicle 700 according to an embodiment may include wheels 13FL and 13FR that are rotated by a power source, and a predetermined sensor. The sensor may be, but is not limited to, a camera sensor 2000.

[0212] The camera 2000 may be a camera sensor to which the camera module 1000 according to the embodiment is applied. The vehicle 700 according to the embodiment can acquire image information through the camera sensor 2000 that captures a front image or a surrounding image, determine a lane unidentified state using the image information, and generate a virtual lane when the lane is unidentified.

[0213] For example, the camera sensor 2000 may capture an image in front of the vehicle 700 to acquire a front image, and a processor (not shown) may analyze objects included in the front image to acquire image information.

[0214] For example, if an object such as a lane marking, an adjacent vehicle, a driving obstacle, or a median strip, a curb, or a roadside tree, which corresponds to an indirect road marking, is captured in the image captured by the camera sensor 2000, the processor can detect such an object and include it in the image information. At this time, the processor can obtain distance information from the detected object through the camera sensor 2000 to further complement the image information.

[0215] The image information may be information about an object captured in the image. The camera sensor 2000 may include an image sensor and an image processing module.

[0216] The camera sensor 2000 can process still or moving images obtained by an image sensor (eg, CMOS or CCD).

[0217] The image processing module processes still or moving images acquired through the image sensor to extract necessary information and transmit the extracted information to a processor.

[0218] In this case, the camera sensor 2000 may include, but is not limited to, a stereo camera to improve the accuracy of measuring the object and further secure information such as the distance between the vehicle 700 and the object.

[0219] The above description has focused on the embodiments, but these are merely examples and are not intended to limit the present invention. Those skilled in the art will recognize that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present invention. For example, each component specifically illustrated in the embodiments can be modified and implemented. Differences related to such modifications and applications should be construed as being included within the scope of the present invention as defined in the appended claims.

Claims

1. a first lens group adjacent to the object side and having a first optical axis; a second lens group adjacent to the image side and having a second optical axis; a first optical path conversion member disposed between the first lens group and the second lens group, the second lens group is movable; a wide state is provided when the center of the second lens group overlaps with the first optical path conversion member in the direction of the second optical axis; an optical system having a telephoto state when the center of the second lens group does not overlap with the first optical path conversion member in the second optical axis direction;

2. The optical system according to claim 1 , wherein the first lens group overlaps with the second lens group in the second optical axis direction in the telephoto state.

3. 2. The optical system according to claim 1, wherein the ratio of the focal length to the F-number (fno) is 5 to 7 in at least one of the telephoto state and the wide-angle state.

4. The optical system according to claim 1 , wherein the distance between the first lens group and the second lens group is 5 mm or more.

5. 2. The optical system according to claim 1, wherein in the wide-angle state, the distance between the image side surface of the outermost lens of the second lens group and the image sensor is 5 mm or more.

6. The optical system according to claim 1 , wherein in the wide state, the second lens group is inserted so that the first optical path conversion member overlaps with the second optical axis.

7. The optical system according to claim 1 , wherein in the wide state, the second lens group is inserted so that at least a part of the first optical path changing member does not overlap with the second optical axis.

8. 2. The optical system according to claim 1, wherein the ratio of TTL (total track length) to BFL (back focus length) is 4-10.

9. a first lens group; and a second lens group disposed apart from the first lens group; a first optical path converting member disposed between the first lens group and the second lens group, An optical system having an F number (Fno) of 3.5 or less when light passes through the first lens group but not through the second lens group.

10. The optical system according to claim 1 , wherein the first lens group is disposed in a thickness direction of the first optical path changing member.

Images