Optical system, optical device, and imaging device module including the optical system

Abstract

Disclosed is an optical system including: a first lens group adjacent to an 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, in which the second lens group is movable. The optical system is in a wide-angle state when the center of the second lens group overlaps the first optical path conversion member in the second optical axis direction, and is in a telephoto state when the center of the second lens group does not overlap 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 an imaging device module including the optical system. Background Art

[0002] An imaging device captures an image or video of an object and is installed in a mobile device, a drone, a vehicle, etc. The imaging device module may have an image stabilization (IS) function for compensating or preventing image blur caused by the movement of a user to improve image quality, an autofocus (AF) function for adjusting the focal length of a lens by automatically adjusting the distance between an image sensor and the lens, and a zoom function for increasing or decreasing the magnification of an image of an object at a distance using a zoom lens and capturing an image of the object.

[0003] However, due to the complex structure of a small imaging device module, there are problems in that it is difficult to assemble the small imaging device module and the brightness or F-number (Fno) is reduced due to multiple drivers and miniaturization. Summary of the Invention

[0004] [Technical Problem]

[0005] The technical object to be achieved by the present invention is to provide an optical system, an optical device, and an imaging device module in which a lens having a sufficient size is provided in front of an optical path conversion member (prism) so that the F-number (Fno) is small and the brightness is sufficiently ensured.

[0006] In addition, the present invention aims to provide an optical system, an optical device, and an imaging device module having a simple structure and being easy to assemble.

[0007] In addition, the present invention aims to provide an optical system, an optical device, and an imaging device module including one mover or driver and providing a zoom function.

[0008] The present invention aims to provide an optical system and an optical device applicable to an ultra-thin, ultra-small, and high-resolution imaging device.

[0009] The object to be solved by the embodiments is not limited thereto, and will include objects or effects that can be understood from the technical solutions or embodiments of the present invention described below.

[0010] [Technical Solution]

[0011] An optical system according to an embodiment of the present invention includes: a first lens group, which is disposed adjacent to the object side and has a first optical axis; a second lens group, which is disposed adjacent to the image side and has a second optical axis; and a first optical path conversion member, which is disposed between the first lens group and the second lens group, wherein the second lens group is movable, and when the center of the second lens group overlaps with the first optical path conversion member in the direction of the second optical axis, the optical system is in a wide-angle state, and when the center of the second lens group does not overlap with the first optical path conversion member in the direction of the second optical axis, the optical system is in a telephoto state.

[0012] In the telephoto state, the first lens group may overlap with the second lens group in the direction of the second optical axis.

[0013] In at least one of the telephoto state and the wide-angle state, the ratio of the focal length to the F-number (Fno) may be in the range of 5 to 7.

[0014] The distance between the first lens group and the second lens group may be 5 mm or greater than 5 mm.

[0015] 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 may be 5 mm or greater than 5 mm.

[0016] In the wide-angle state, the second lens group may be aligned with and overlap the first optical path conversion member along the second optical axis.

[0017] In the wide-angle state, the second lens group may be aligned with the first optical path conversion member, and at least a part of the second lens group may not overlap the first optical path conversion member along the second optical axis.

[0018] The ratio of the total lens length (TTL) to the back focal length (BFL) may be in the range of 4 to 10.

[0019] An optical system according to another embodiment includes: a first lens group; a second lens group, which is separately disposed from the first lens group; and a first optical path conversion member, which is disposed between the first lens group and the second lens group, wherein when light passes through the first lens group but not through the second lens group, the Fno is 3.5 or less than 3.5.

[0020] The first lens group may be disposed in the thickness direction of the first optical path conversion member.

[0021] [Advantageous Effects]

[0022] According to an embodiment of the present invention, an optical system, an optical device, and an imaging device module can be realized, wherein a lens having a sufficient size is provided in front of an optical path conversion member (prism) so that the F-number (Fno) is small and the brightness is sufficiently ensured.

[0023] In addition, the present invention can realize an optical system, an optical device, and an imaging device module with a simple structure and easy to assemble.

[0024] In addition, the present invention can realize an optical system, an optical device, and an imaging device module including a mover or a driver and providing a zoom function.

[0025] In addition, the present invention can provide an optical system and an optical device having sufficient space for an optical path conversion member to perform a zoom magnification.

[0026] The present invention can realize an optical system and an optical device applicable to an ultra-thin, ultra-small, and high-resolution imaging device.

[0027] Various useful advantages and effects of the present invention are not limited to the above, and can be more easily understood from the detailed description of the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a perspective view showing an imaging device module according to an embodiment.

[0029] Figure 2 is a conceptual diagram showing an optical device according to a first embodiment.

[0030] Figure 3 is a top view showing the optical device according to the first embodiment in a first state.

[0031] Figure 4 is a top view showing the optical device according to the first embodiment in a second state.

[0032] Figure 5 is a conceptual diagram showing an optical device according to a second embodiment.

[0033] Figure 6 is a top view showing the optical device according to the second embodiment in a second state.

[0034] Figure 7 is a top view showing the optical device according to the second embodiment in a first state.

[0035] Figure 8a is a conceptual diagram showing an optical system according to the first embodiment.

[0036] Figure 8bIt is a cross-sectional view showing the optical system in the wide-angle state according to the first embodiment.

[0037] Figure 9a It is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the wide-angle state according to the first embodiment.

[0038] Figure 9b It is a graph showing the diffraction modulation transfer function (MTF) in the optical system in the wide-angle state according to the first embodiment.

[0039] Figure 10 It is a cross-sectional view showing the optical system in the telephoto state according to the first embodiment.

[0040] Figure 11a It is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the telephoto state according to the first embodiment.

[0041] Figure 11b It is a graph showing the diffraction MTF in the optical system in the telephoto state according to the first embodiment.

[0042] Figure 12 It is a cross-sectional view showing the optical system in the wide-angle state according to the second embodiment.

[0043] Figure 13 It is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the wide-angle state according to the second embodiment.

[0044] Figure 14 It is a cross-sectional view showing the optical system in the telephoto state according to the second embodiment.

[0045] Figure 15 It is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the telephoto state according to the second embodiment.

[0046] Figure 16 It is a cross-sectional view showing the optical system in the wide-angle state according to the third embodiment.

[0047] Figure 17It is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the wide-angle state according to the third embodiment.

[0048] Figure 18 It is a cross-sectional view showing the optical system in the telephoto state according to the third embodiment.

[0049] Figure 19 It is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the telephoto state according to the third embodiment.

[0050] Figure 20 It is a perspective view showing a mobile terminal to which the imaging device module according to the embodiment is applied.

[0051] Figure 21 It is a perspective view showing a vehicle to which the imaging device module according to the embodiment is applied. Detailed Embodiments

[0052] Since the present invention allows various variations and has many embodiments, specific embodiments will be shown and described in the drawings. However, this is not intended to limit the present invention to the specific embodiments, and it should be understood that all variations, equivalents, and alternatives falling within the spirit and technical scope of the present invention are included in the present invention.

[0053] Although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present invention, a second element may be referred to as a first element, and a first element may similarly be referred to as a second element. The term "and / or" includes any one or any combination of a plurality of related listed items.

[0054] When a first element is referred to as being "connected" or "coupled" to a second element, it will be understood that the first element can be directly connected or coupled to the second element, or a third element may be present between them. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, it will be understood that there is no intermediate element.

[0055] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the present invention. The singular forms are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprises" or "comprising" used in this specification specify the presence of the stated features, numbers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0056] Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0057] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In all the drawings, the same or corresponding components will be denoted by the same or corresponding reference numerals, and their repeated description will be omitted.

[0058] Figure 1 is a perspective view showing a camera device module according to an embodiment, and Figure 2 is a conceptual diagram showing an optical device according to a first embodiment. Figure 3 is a top view showing the optical device according to the first embodiment in a first state, and Figure 4 is a top view showing the optical device according to the first embodiment in a second state.

[0059] Referring to Figure 1 , the camera device module 1000 according to an embodiment may include a cover CV, a first camera device actuator 1100, a second camera device actuator 1200, and a circuit board 1300. In this case, the first camera device actuator 1100 may be used interchangeably with the first actuator, and the second camera device actuator 1200 may be used interchangeably with the second actuator.

[0060] The cover CV may cover the first camera device actuator 1100 and the second camera device actuator 1200. The cover CV may increase the coupling force between the first camera device actuator 1100 and the second camera device actuator 1200.

[0061] In addition, the cover CV may be formed of a material capable of blocking electromagnetic waves. Thus, it is possible to easily protect the first camera device actuator 1100 and the second camera device actuator 1200 located in the cover CV.

[0062] The cover CV may have a structure that partially protrudes in the first direction (X-axis direction) due to the first lens group of the first imaging device actuator 1100. Additionally, the cover CV may have a structure that partially protrudes in a direction perpendicular to the second direction, for example, the third direction (Y-axis direction), corresponding to the movement of the second lens group in the second imaging device actuator 1200.

[0063] Additionally, the first imaging device actuator 1100 may be an optical image stabilizer (OIS) actuator. For example, the first imaging device actuator 1100 may change the optical axis O.

[0064] The first imaging device actuator 1100 may include a fixed focal length lens disposed in a predetermined cylinder (not shown). The fixed focal length lens may be referred to as a "single focal length lens" or a "single lens".

[0065] The first imaging device actuator 1100 may change the optical path. In an embodiment, the first imaging device actuator 1100 may use an optical member or a first optical path conversion member (e.g., a prism or a mirror) to change the optical path to be perpendicular. For example, the first optical path conversion member may change the light in the first direction (X-axis direction) to the light in the second direction (Z-axis direction). Alternatively, the optical member may change the light along the first axis to the light along the second axis. Due to this configuration, even when the thickness of the mobile terminal is reduced, a lens structure larger than the thickness of the mobile terminal can be provided in the mobile terminal by changing the optical path, thereby performing functions such as magnification, autofocus (AF), zoom, and OIS. Additionally, the distance in this specification may correspond to the distance along the optical path.

[0066] However, the present invention is not limited thereto, and the imaging device module may also change the optical path by a right angle or a specific angle multiple times.

[0067] The second imaging device actuator 1200 may be disposed behind the first imaging device actuator 1100. The second imaging device actuator 1200 may be coupled to the first imaging device actuator 1100. Additionally, the coupling between them may be performed according to any one of various methods.

[0068] Additionally, the second imaging device actuator 1200 may be a zoom actuator. For example, the second imaging device actuator 1200 may support one or more lenses and move one or more lenses according to a control signal of a predetermined controller to perform a zoom function.

[0069] In addition, one or more lenses may be moved independently or individually in a direction perpendicular to the first direction (X-axis direction). For example, in the imaging device module, the second direction (Z-axis direction) may correspond to the optical axis direction. In the second imaging device actuator 1200, the second lens group G2 may be moved in a direction (second direction and third direction) perpendicular to the optical axis direction or the first direction (X-axis direction) to align or misalign with the optical path. Alternatively, the second lens group G2 may be moved in the optical axis direction or the first direction (X-axis direction) to align or misalign with the optical path. Hereinafter, the movement of the second lens group G2 in the third direction (Y-axis direction) or its alignment or misalignment therewith will be described.

[0070] The circuit board 1300 may be disposed behind the second imaging device actuator 1200. The circuit board 1300 may be electrically connected to the second imaging device actuator 1200 and the first imaging device actuator 1100. In addition, the circuit board 1300 may be provided as a plurality of circuit boards 1300.

[0071] The imaging device module according to an embodiment may be provided as a single or multiple imaging device modules. For example, the multiple imaging device modules may include a first imaging device module and a second imaging device module.

[0072] In addition, the first imaging device module may include a single or multiple actuators. For example, the first imaging device module may include the first imaging device actuator 1100 and the second imaging device actuator 1200.

[0073] In addition, the second imaging device module may include an actuator (not shown) that is disposed in a predetermined housing (not shown) and drives the lens portion. The actuator may be a voice coil motor, a micro actuator, a silicon actuator, etc., and any one of various methods such as an electrostatic method, a thermal method, a piezoelectric method, and an electrostatic force method may be applied, but the present invention is not limited thereto. In addition, in the present specification, the imaging device actuator may also be referred to as an actuator or the like. In addition, the imaging device module provided as multiple imaging device modules may be installed in any one of various electronic devices such as a mobile terminal. In addition, the actuator may be a device that moves or tilts a lens and an optical member. However, hereinafter, the actuator will be described as conceptually including a lens or an optical member. In addition, the actuator may be referred to as a "lens transfer device", a "lens moving device", an "optical member transfer device", an "optical member moving device", etc.

[0074] Referring to Figures 2 to 4 , the optical device according to the first embodiment may include a first lens group G1, a first optical path conversion member L5, and a second lens group G2.

[0075] In addition, the optical device according to the first embodiment may further include an image sensor IS and a circuit board 1300. In this case, the image sensor IS may be disposed on the optical path and may receive light. In addition, the image sensor IS may convert the received light into an electrical signal and transmit the electrical signal to the outside through a circuit board or the like.

[0076] In addition, the optical device according to the first embodiment may include a first imaging device actuator, a second imaging device actuator, etc. For example, the first imaging device actuator may include a first lens group G1 and a first optical path conversion member L5. In addition, the second imaging device actuator may include a second lens group G2. Hereinafter, the optical device according to the present embodiment will be described based on the first lens group G1, the first optical path conversion member L5, the second lens group G2, and the image sensor IS.

[0077] First, in the optical device according to the embodiment, the first optical path conversion member L5 may change the optical path of incident light incident from the object side in the first direction (X-axis direction) to the optical path in the second direction. The first optical path conversion member L5 may be referred to as the "fifth lens". In addition, the first optical path conversion member may also be referred to as a "reflection member" or the like. In addition, the first lens group G1 may have a first optical axis. That is, the first optical axis may correspond to the central axis of the first lens group G1. In addition, the first optical axis may correspond to the first direction or the X-axis direction. In addition, the second lens group G2 may also have a second optical axis. That is, the second optical axis may correspond to the central axis of the second lens group G2. The second optical axis may correspond to the second direction (Z-axis direction).

[0078] Therefore, light may be incident on the first optical path conversion member L5 in the first direction (X-axis direction), and then the light may be reflected and emitted in the second direction (Z-axis direction). For this purpose, the first optical path conversion member L5 may include a prism, a mirror, etc.

[0079] The first lens group G1 may be located between the first optical path conversion member L5 and the object side. Alternatively, the first lens group G10 may be located in front of the first optical path conversion member L5. In addition, the first lens group G1 may be disposed close to the object side. In this specification, "front" and "front side" mean the direction of the object side on the optical path. In addition, "rear" and "rear side" mean the direction opposite to the direction of the object side, or mean the direction toward the image sensor on the optical path.

[0080] The first lens group G1 may be located on the object side of the first optical path conversion member L5 and may include at least one lens.

[0081] The first lens group G1 may be disposed in the thickness direction of the first optical path conversion member, or may be disposed in the first direction.

[0082] 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. The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 may be sequentially arranged from the object side toward the image side (corresponding to the image sensor).

[0083] In addition, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 may be disposed above the first optical path conversion member L5.

[0084] The second lens group G2 may be located between the first optical path conversion 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 sequentially arranged in the optical axis direction or the second direction (Z-axis direction).

[0085] In addition, the second lens group G2 may be aligned or misaligned with the optical path as described above. In other words, the second lens group G2 may be positioned inside or outside the optical path by various drivers. For example, the driver may include an actuator (not shown). The actuator may be a voice coil motor, a micro actuator, a silicon actuator, etc., and any one of various methods such as an electrostatic method, a thermal method, a piezoelectric method, and an electrostatic force method may also be applied, but the present invention is not limited thereto.

[0086] The second lens group G2 may move in a direction perpendicular to the second direction (Z-axis direction). For example, the second lens group G2 may move in the first direction (X-axis direction). In addition, the second lens group G2 may also move in the third direction (Y-axis direction). In this case, even when the second lens group G2 moves, the length of the imaging device module or the optical device may not increase in the first direction. In other words, even when the imaging device module or the optical device performs a zoom or magnification function, its size or thickness may be reduced. Therefore, the optical device and the imaging device module according to the embodiment may have a compact structure while providing a high magnification function.

[0087] In addition, in the first lens group G1, the area of at least one lens may be larger than the area of the first optical path conversion member L5. For example, the length W1 of at least one lens 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). For example, the length of at least one of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 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).

[0088] In addition, the length D1 of at least one lens of the first lens group G1 in the third direction (Y-axis direction) can be greater than the length of the first optical path conversion member L5 in the third direction (Y-axis direction). For example, the length of at least one of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 in the third direction (Y-axis direction) can be greater than the length of the first optical path conversion member L5 in the third direction (Y-axis direction).

[0089] Due to this configuration, the F-number (Fno) of at least one lens of the first lens group G1 can be variously changed. In an embodiment, the Fno of at least one lens of the first lens group G1 can be easily reduced.

[0090] In addition, the shape of the edge of at least one lens of the first lens group G1 can be a circular shape. For example, at least a part of the edge of at least one lens of the first lens group G1 may not have a flat shape in a direction perpendicular to the first direction. In other words, D-cut may not be applied to at least one lens of the first lens group G1.

[0091] Due to this configuration, the optical device and the imaging device module according to the present embodiment can provide bright optical performance.

[0092] In addition, at least one of the first lens group G1 and the first optical path conversion 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). Alternatively, the first optical path conversion member L5 can tilt in a direction perpendicular to the first direction (X-axis direction). Therefore, the first imaging device actuator 110 can easily perform an anti-shake function.

[0093] In addition, as described above, the length W1 of the first lens group G1 in the second direction (Z-axis direction) can be greater than the length W2 of the first optical path conversion member L5 in the second direction (Z-axis direction).

[0094] In addition, the length W3 of the second lens group G2 in the second direction (Z-axis direction) can be greater than the length of the first optical path conversion member L5 in the second direction (Z-axis direction). In addition, the length W3 of the second lens group G2 in the second direction (Z-axis direction) can be less than or equal to the length W1 of the first lens group G1 in the second direction (Z-axis direction).

[0095] In addition, the ratio of the length WL of the optical device and the imaging device 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 in the range of 1:0.8 to 1:0.95. Therefore, the optical device and the imaging device module can have a compact structure and the image sensor can be miniaturized.

[0096] In an embodiment, according to the arrangement of the second lens group G2, the optical device can be in a telephoto or wide-angle state. In this specification, the first state can be a wide angle (or wide-angle state), and the second state can be a telephoto (or telephoto state).

[0097] In addition, in the first state, the second lens group G2 can be disposed on the optical path. That is, in the first state, the second lens group G2 can overlap with the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction.

[0098] In addition, in the first state, at least a part of the second lens group G2 can overlap with the first lens group G1. For example, in the first state, the second lens group G2 can have an overlapping region OV that overlaps with the first lens group G1 in the first direction (X-axis direction). Due to this configuration, the optical device and the imaging device module can be miniaturized. In addition, the zoom drive can be easily performed by one moving group.

[0099] In addition, in the second state, the second lens group G2 can be not disposed on the optical path. That is, in the second state, at least a part of the second lens group G2 can not overlap with the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction. Alternatively, the first lens group G1 can overlap with the second lens group G2 in the second optical axis direction or the second direction (Z-axis direction). This case can be a case where the second lens group G2 moves upward or moves in the first optical axis direction.

[0100] However, in the second state, a part of the edge region of the second lens group G2 can overlap with the first optical path conversion member L5 in the second direction (Z-axis direction). Therefore, the imaging device module can have a compact structure while performing the zoom function.

[0101] For example, the cover CV may have a structure protruding toward one side to allow alignment or misalignment with the second lens group G2. Additionally, the second lens group G2 may also have a structure that partially protrudes from the first lens group G1 in the second direction in the second state. The length D3 of the protruding structure in the second direction (Y-axis direction) may be less than the length D2 of the second lens group G2 in the second direction (Y-axis direction). Therefore, the optical device and the imaging device module can provide improved space efficiency. Additionally, 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). Therefore, as described above, the optical device can provide very bright optical performance.

[0102] Additionally, the length l1 of the first lens group G1 in the first direction (X-axis direction) may be less than the length l2 of the first optical path conversion member L5 in the first direction (X-axis direction). Therefore, bright light can be provided while minimizing the thickness of the optical device and the imaging device module.

[0103] Additionally, the length of the second lens group G2 in the first direction may be less than or equal to the length l2 of the first optical path conversion member L5 in the first direction (X-axis direction).

[0104] Figure 5 is a conceptual diagram showing an optical device according to the second embodiment, Figure 6 is a top view showing the optical device according to the second embodiment in the second state, and Figure 7 is a top view showing the optical device according to the second embodiment in the first state.

[0105] Referring to Figures 5 to 7 , the optical device according to the second embodiment may include 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.

[0106] Additionally, the optical device according to the second embodiment may further include an image sensor IS and a circuit board 1300. In this case, the image sensor IS may be disposed on the optical path and may receive light. Additionally, the image sensor IS may convert the received light into an electrical signal and transmit the electrical signal to the outside through a circuit board or the like.

[0107] In addition, the optical device according to the second embodiment may include a first imaging device actuator, a second imaging device actuator, and the like. For example, the first imaging device actuator may include a first lens group G1 and a first optical path conversion member L5. In addition, the second imaging device actuator may include a second lens group G2. In addition, the second imaging device actuator may also include a second optical path conversion member L10. Hereinafter, the optical device according to the present embodiment will be described based on the first lens group G1, the first optical path conversion member L5, the second lens group G2, and the image sensor IS.

[0108] First, in the optical device of the embodiment, the first optical path conversion member L5 may change the optical path of incident light incident from the object side in the first direction (X-axis direction) to an optical path in the second direction. The first reflection member L5 may be referred to as the "fifth lens".

[0109] Therefore, light may be incident on the first optical path conversion member L5 in the first direction (X-axis direction), and then the light may be reflected and emitted in the second direction (Z-axis direction). For this purpose, the first optical path conversion member L5 may include a prism, a mirror, and the like.

[0110] The first lens group G1 may be located between the first optical path conversion member L5 and the object side. Alternatively, the first lens group G10 may be located in front of the first optical path conversion member L5. In this specification, "front" and "forward" mean the direction of the object side on the optical path. In addition, "rear" and "backward" mean the direction opposite to the direction of the object side, or mean the direction toward the image sensor on the optical path.

[0111] The first lens group G1 may be located on the object side of the first optical path conversion member L5 and may include at least one lens.

[0112] 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. The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 may be sequentially arranged from the object side toward the image side (corresponding to the image sensor).

[0113] In addition, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 may be arranged above the first optical path conversion member L5.

[0114] The second lens group G2 may be located between the first optical path conversion 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 sequentially arranged in the optical axis direction or the second direction (Z-axis direction).

[0115] In addition, the second lens group G2 can be aligned or misaligned with 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 drivers. For example, the driver can include an actuator (not shown). The actuator can be a voice coil motor, a micro actuator, a silicon actuator, etc., and any one of various methods such as the electrostatic method, the thermal method, the piezoelectric method, and the electrostatic force method can also be applied, but the present invention is not limited thereto.

[0116] 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). In addition, the second lens group G2 can also move in the third direction (Y-axis direction). In this case, even when the second lens group G2 moves, the length of the imaging device module or the optical device may not increase in the first direction. In other words, even when the imaging device module or the optical device performs a zoom or magnification function, its size or thickness can be reduced. Therefore, the optical device and the imaging device module according to the embodiment can have a compact structure while providing a high magnification function.

[0117] In addition, in the first lens group G1, the area of at least one lens can be larger than the area of the first optical path conversion member L5. For example, the length W1 of at least one lens of the first lens group G1 in the second direction (Z-axis direction) can be larger than the length W2 of the first optical path conversion member L5 in the second direction (Z-axis direction). For example, the length of at least one of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 in the second direction (Z-axis direction) can be larger than the length W2 of the first optical path conversion member L5 in the second direction (Z-axis direction).

[0118] In addition, the length D1 of at least one lens of the first lens group G1 in the third direction (Y-axis direction) can be larger than the length of the first optical path conversion member L5 in the third direction (Y-axis direction). For example, the length of at least one of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 in the third direction (Y-axis direction) can be larger than the length of the first optical path conversion member L5 in the third direction (Y-axis direction).

[0119] Due to this configuration, the Fno of at least one lens in the first lens group G1 can be changed in various ways. In an embodiment, it is possible to easily reduce the Fno of at least one lens of the first lens group G1.

[0120] In addition, the shape of the edge of at least one lens of the first lens group G1 may be a circular shape. For example, at least a part of the edge of at least one lens of the first lens group G1 may not have a flat shape in a direction perpendicular to the first direction. In other words, D-cut may not be applied to at least one lens of the first lens group G1.

[0121] Due to this configuration, the optical device and the imaging device module according to the present embodiment can provide bright optical performance.

[0122] In addition, at least one of the first lens group G1 and the first optical path conversion member L5 may move or tilt in a direction perpendicular to the first direction (X-axis direction). For example, the first lens group G1 may move in a direction perpendicular to the first direction (X-axis direction). Alternatively, the first optical path conversion member L5 may also tilt in a direction perpendicular to the first direction (X-axis direction). Therefore, the first imaging device actuator 110 can easily perform an anti-shake function.

[0123] In addition, 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).

[0124] In addition, 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 conversion member L5 in the second direction (Z-axis direction). In addition, 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).

[0125] In addition, the ratio of the length WL of the optical device and the imaging device 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) may be in the range of 1:0.8 to 1:0.95. Therefore, the optical device and the imaging device module can have a compact structure and the image sensor can be miniaturized.

[0126] In an embodiment, according to the arrangement of the second lens group G2, the optical device may be in a telephoto or wide-angle state. In this specification, the first state may be a wide-angle state, and the second state may be a telephoto state.

[0127] In addition, in the first state, the second lens group G2 may be disposed on the optical path. That is, in the first state, the second lens group G2 may overlap the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction.

[0128] In addition, in the first state, at least a part of the second lens group G2 may overlap with the first lens group G1. For example, in the first state, the second lens group G2 may have an overlapping region OV that overlaps with the first lens group G1 in the first direction (X-axis direction). Due to this configuration, the optical device and the imaging device module can be miniaturized. In addition, the zoom drive can be easily performed by one moving group.

[0129] In addition, in the second state, the second lens group G2 may not be disposed on the optical path. That is, in the second state, at least a part of the second lens group G2 may not overlap with the first optical path conversion member L5 in the second direction (Z-axis direction) or the optical axis direction.

[0130] However, in the second state, a part of the edge region of the second lens group G2 may overlap with the first optical path conversion member L5 in the second direction (Z-axis direction). Therefore, the imaging device module can have a compact structure while performing the zoom function.

[0131] For example, the cover CV may have a structure that protrudes toward one side to allow the second lens group G2 to be aligned or misaligned therewith. In addition, the second lens group G2 may also have a structure that partially protrudes from the first lens group G1 in the second direction in the second state. The length D3 of the protruding structure in the second direction (Y-axis direction) may be less than the length D2 of the second lens group G2 in the second direction (Y-axis direction). Therefore, the optical device and the imaging device module can provide improved space efficiency. In addition, 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). Therefore, as described above, the optical device can provide very bright optical performance.

[0132] In addition, the length l1 of the first lens group G1 in the first direction (X-axis direction) may be less than the length l2 of the first optical path conversion member L5 in the first direction (X-axis direction). Therefore, bright light can be provided while minimizing the thickness of the optical device and the imaging device module.

[0133] In addition, the length of the second lens group G2 in the first direction may be less than or equal to the length l2 of the first optical path conversion member L5 in the first direction (X-axis direction).

[0134] The above description regarding the optical device according to the first embodiment can equally apply to the descriptions of the first lens group G1, the first optical path conversion member L5, and the second lens group G2.

[0135] In addition, the optical device according to the second embodiment may further include a second optical path conversion member L10 disposed between the second lens group G2 and the image sensor IS.

[0136] The second optical path conversion member L10 can change the optical path of incident light incident in the second direction (Z-axis direction) to an optical path in a direction perpendicular to the second direction (e.g., the first direction (X-axis direction)). The second optical path conversion member L10 can be referred to as the "tenth lens".

[0137] Therefore, light can be incident on the second optical path conversion member L10 in the second direction (Z-axis direction), and then the light can be reflected and emitted in the first direction (X-axis direction). For this purpose, the first optical path conversion member L5 can include a prism, a mirror, etc. In addition, the image sensor IS can be miniaturized due to the reflection of the second optical path conversion member L10.

[0138] In addition, in the optical device according to the first embodiment and the second embodiment, the first lens group G1, the first optical path conversion member L5, the second lens group G2, and the second optical path conversion member L10 can be moved integrally. Therefore, the AF function can be executed.

[0139] In addition, the degree of freedom of the position of the image sensor IS or the degree of freedom of the electronic device can be increased due to the second optical path conversion member L10.

[0140] Figure 8a is a conceptual diagram showing the optical system according to the first embodiment, and Figure 8b is a cross-sectional view showing the optical system in the wide-angle state according to the first embodiment. Figure 9a is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the wide-angle state according to the first embodiment, and Figure 9b is a graph showing the diffraction modulation transfer function (MTF) in the optical system in the wide-angle state according to the first embodiment. Figure 10 is a cross-sectional view showing the optical system in the telephoto state according to the first embodiment. Figure 11a is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the telephoto state according to the first embodiment, and Figure 11b is a graph showing the diffraction MTF in the optical system in the telephoto state according to the first embodiment.

[0141] Referring to Figure 8a , as described above, the first lens group G1 can be located above the first optical path conversion member L5. In addition, as in the first embodiment and the second embodiment, the second optical path conversion member L10 may or may not exist.

[0142] The first optical path conversion member L5 changes the optical path, and the second optical path conversion member L10 also changes the optical path. When considering these and determining the optical performance, as Figures 8b to 19 shown, the first optical path conversion member L5 and the second optical path conversion member L10 correspond to members without curvature. Additionally, hereinafter, a case where light passes through the first optical path conversion member L5 and the second optical path conversion member L10 without being reflected will be shown. However, even when showing light passing through the first optical path conversion member L5 and the second optical path conversion member L10, it should be understood that the first optical path conversion member L5 and the second optical path conversion member L10 actually change the optical path as described above.

[0143] In addition, the optical system may include the first lens group G1, the first optical path conversion member L5, the second lens group G2, the second optical path conversion member L10, and the image sensor IS described above. Additionally, the optical system may further include a filter F disposed between the second optical path conversion member L10 and the image sensor IS. The filter F may be formed of glass or the like. Additionally, the filter F may allow light of a specific wavelength to pass through, or may block light of a specific wavelength. Additionally, the filter F may prevent foreign substances from being introduced into the image sensor IS. Therefore, the optical device may include some or all of the various optical systems described below. Additionally, the imaging device module may also include any one of the various optical systems described below. Hereinafter, the optical system Figures 8b to 19 will be described based on the above components.

[0144] Referring to Figure 8b , the optical system 10A according to the first embodiment includes the first lens group G1, the first optical path conversion member L5, the second lens group G2, and the second optical path conversion member L10 sequentially arranged from the object side toward the image side.

[0145] Hereinafter, the first optical path conversion member L5 will be described as the fifth lens L5. Additionally, the fifth lens L5 may include a prism. Additionally, hereinafter, the second optical path conversion member L10 will be described as the tenth lens L10. Additionally, the tenth lens L10 may include a prism.

[0146] According to an embodiment of the present invention, the first lens group G1 may include at least one lens. In the embodiment, the first lens group G1 may include the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 sequentially arranged on the optical path.

[0147] The second lens group G2 may include at least one lens. In 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. As described above, zoom driving may be performed when the second lens group G2 is aligned or misaligned therewith. Thus, the first lens group G1 may be fixed independently of the zoom driving.

[0148] In addition, as the second lens group G2 moves, the zoom of the optical system 10A may vary between a magnification of 1x and a magnification of 10x. For example, in the wide-angle state, the optical system may provide a magnification of 1x. In addition, in the telephoto state, the optical system may provide a magnification of 5x.

[0149] 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 among the plurality of lenses included in the first lens group G1 may have a positive (+) refractive power. The lens disposed on the object side among the plurality of lenses included in the first lens group G1 may have a negative (-) refractive power.

[0150] 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 sequentially disposed from the object side toward the image side. Among them, the first lens L1 may have a positive refractive power, and the second lens L2 may have a positive refractive power. The third lens L3 may have a positive refractive power. In addition, the fourth lens L4 may have a negative refractive power.

[0151] According to an embodiment of the present invention, the second lens group G2 may include a plurality of lenses having different refractive powers. The lens disposed on the image side among the plurality of lenses included in the second lens group G2 may have a positive (+) refractive power. The lens disposed on the object side among the plurality of lenses included in the second lens group G2 may have a positive (+) refractive power.

[0152] 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 sequentially disposed from the object side toward the image side. Among them, the sixth lens L6 may have a positive refractive power, and the seventh lens L7 may have a negative refractive power. The eighth lens L8 may have a negative refractive power. In addition, the ninth lens L9 may have a positive refractive power.

[0153] In addition, each of the lenses included in the first lens group G1 and the second lens group G2 may be formed of a plastic or glass material.

[0154] Table 1 and Table 2 below show the optical characteristics of the lenses included in the optical system according to an embodiment of the present invention, and Table 3 and Table 4 show the Koenig constants and aspherical coefficients of the lenses of the optical system according to an embodiment of the present invention.

[0155] [Table 1]

[0156]

[0157]

[0158] The object-side surface represents the thickness of the lens, and the image-side surface represents the distance to the next member. Additionally, Nd is the refractive index, and Vd is the Abbe number (dispersion). These apply similarly below.

[0159] [Table 2]

[0160]

[0161]

[0162]

[0163] [Table 3]

[0164]

[0165]

[0166] [Table 4]

[0167]

[0168]

[0169]

[0170] In Table 1, the unit of thickness is [mm]. In Table 1 and the like, the center thickness [mm] of the lens, the distance [mm] between the lenses, the curvature of the lens, the refractive index, and the Abbe number are shown. Additionally, the unit of the general distance described in this specification is [mm]. Additionally, in the process of zooming in the telephoto state, since the second lens group G2 is not aligned, the sixth to ninth lenses are removed. Additionally, the characteristics of the removed sixth to ninth lenses can be changed. However, the description of the first to fifth lenses can be the same. Additionally, since the sixth to ninth lenses are removed, the thickness written as corresponding to the image-side surface of the fifth lens is the distance between the fifth lens and the ninth lens, rather than the distance between the fifth lens and the sixth lens. Referring to Table 2, each surface of the first to fourth lenses and the sixth to ninth lenses can be formed into a convex shape or a concave shape.

[0171] The first lens L1 may be a lens with its object-side surface S11 bulging toward the object side. The first lens L1 may be a lens with its image-side surface S12 bulging toward the object side. In other words, the object-side surface S11 of the first lens L1 may be recessed toward the image side. Additionally, the image-side surface S12 of the first lens L1 may be recessed toward the image side.

[0172] The second lens L2 may be a lens with its object-side surface L21 bulging toward the object side. The second lens L2 may be a lens with its image-side surface L22 recessed toward the object side. The "convex" and "concave" described in Table 2 are based on the object side.

[0173] In addition, as shown in the attached drawings, the thickness T1 of the first lens L1 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S11 of the first lens L1. Also, the thickness T2 of the second lens L2 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S21 of the second lens L2. The thickness T3 of the third lens L3 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S31 of the third lens L3. The thickness T4 of the fourth lens L4 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S41 of the fourth lens L4. The thickness T6 of the sixth lens L6 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S61 of the sixth lens L6. The thickness T7 of the seventh lens L7 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S71 of the seventh lens L7. The thickness T8 of the eighth lens L8 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S81 of the eighth lens L8. The thickness T9 of the ninth lens L9 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S91 of the ninth lens L9.

[0174] [Table 5]

[0175]

[0176]

[0177] [Table 6]

[0178]

[0179]

[0180]

[0181]

[0182] Table 5 relates to the total lens length (TTL), effective focal length (EFL), back focal length (BFL), lens focal length, etc. of the optical system. Additionally, the Fno of the total lens part is 2 or greater than 2, for example, 2.275. The field of view (FOV) viewed from the imaging device module can be 20° or less than 20°, for example, it can be in the range of 8° to 15°. In this case, the FOV viewed from the imaging device module represents the half FOV. Therefore, the FOV viewed from the imaging device module can be 1 / 2 of the FOV of the imaging device module. Table 6 shows the result values of the above formula in the optical system of the embodiment. Referring to Table 6, it can be seen that the optical system according to one embodiment satisfies at least one or two or more of Formula 1 to Formula 38.

[0183] Additionally, ET is the edge thickness and represents the thickness of the edge of the lens. nx represents the refractive index of the x-th lens.

[0184] CA_L#1S# represents the effective diameter of the object-side surface of the first lens, and CA_L#2S# represents the effective diameter of the object-side surface of the second lens. CA_L3S2 is the effective diameter of the image-side surface of the third lens, and CA_L4S1 represents the effective diameter of the object-side surface of the fourth lens. d34_CT is the center (optical axis) distance between the third lens and the fourth lens, and d34_ET is the edge distance between the third lens and the fourth lens. D910_CT is the center (optical axis) distance between the ninth lens and the tenth lens, and D910_ET is the edge distance between the ninth lens and the tenth lens. L_CT_Max is the maximum thickness of the lens, 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 spacing distances. ΣIndex is the sum of the refractive indices. ΣAbb is the sum of the Abbe numbers of the lenses. Air_Edge_Max is the maximum value of the spacing distance between the edges of the lenses, and L_CT_Max is the maximum thickness of the lens. CA_max is the maximum value of the effective diameter, and CA_Aver is the average value of the effective diameter. CA_min is the minimum value of the effective diameter. TD is the distance from the object-side surface of the first lens to the image-side surface of the tenth lens. F is the EFL, and L1R1 is the radius of the object-side surface of the first lens. The f# number represents the focal length of the numbered lens.

[0185] Additionally, in the telephoto state of the optical system according to the embodiment, the Fno can be less than 3.8. That is, the optical system can provide bright light.

[0186] In addition, in at least one of the telephoto state and the wide-angle state, the ratio f / Fno of the focal length to the Fno may be in the range of 5 to 7. In this case, f may correspond to the EFL. Due to this configuration, an Fno (or F#) lower than the focal length can be provided.

[0187] In addition, the distance between the first lens group G1 and the second lens group G2 may be 5 mm or greater than 5 mm. Therefore, sufficient space for the fifth lens or the first optical path conversion member can be ensured. In addition, 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 may be 5 mm or greater than 5 mm. Therefore, sufficient space for the second optical path conversion member or the tenth lens for changing the optical path can be ensured. In addition, even without an additional driver for moving the moving group along the optical path, the optical system can ensure space and provide a zoom function.

[0188] In addition, in the present embodiment, the EFL is 11.9 in the wide-angle state and 19.4 in the telephoto state. The Fno is 2.27 in the wide-angle state and 3.71 in the telephoto state, and the HFOV is 12.80 in the wide-angle state and 8.01 in the telephoto state. In the case of the focal length, the total focal length f1-f4 of the first to fourth lenses is 19.4, and the total focal length f6-f9 of the sixth to ninth lenses is 7.94.

[0189] Referring to Figure 9a and Figure 11a , it can be seen that regardless of the wavelength, the longitudinal spherical aberration from the center to the end of the image sensor is in the range of -0.05 [mm] to 0.1 [mm]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the longitudinal spherical aberration is in the range of -0.1 [mm] to 0.1 [mm].

[0190] In addition, it can be seen that regardless of the wavelength, the astigmatism field curve from the center to the end of the image sensor is in the range of -0.05 [mm] to 0.05 [mm]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the astigmatism field curve is in the range of approximately -0.05 [mm] to 0.05 [mm].

[0191] In addition, regardless of the wavelength, the distortion from the center to the end of the image sensor is in the range of -2 [%] to 2 [%]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the distortion is in the range of approximately -2 [%] to 2 [%].

[0192] Referring to Figure 9b and Figure 11b, it can be seen that in the optical system according to the embodiment of the present invention, in each of the wide-angle state and the telephoto state, the modulation near the defocus position of 0 [mm] has a value close to the diffraction limit as the limit value. For example, in the optical system, in each of the wide-angle state and the telephoto state, the modulation near the defocus position of 0 [mm] can be 0.5 or greater than 0.5.

[0193] Figure 12 is a cross-sectional view showing the optical system in the wide-angle state according to the second embodiment, and Figure 13 is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the wide-angle state according to the second embodiment. Figure 14 is a cross-sectional view showing the optical system in the telephoto state according to the second embodiment, and Figure 15 is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of light with wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the telephoto state according to the second embodiment.

[0194] In addition to the shapes shown in the drawings and the content to be described below, the above content can also be equally applicable to the following text. Therefore, at least one or two or more of the formulas 1 to 38 described in Table 6 can also be satisfied by the optical system 10B according to the second embodiment.

[0195] [Table 7]

[0196]

[0197]

[0198] [Table 8]

[0199]

[0200]

[0201] [Table 9]

[0202]

[0203]

[0204] The unit of thickness is [mm]. In Table 8 etc., the center thickness [mm] of the lens, the distance [mm] between the lenses, the curvature of the lens, the refractive index, and the Abbe number are shown. Additionally, the unit of the general distance described in this specification is [mm]. Further, in the process of zooming in the telephoto state, since the second lens group G2 is misaligned, the sixth to ninth lenses are removed. Additionally, the characteristics of the removed sixth to ninth lenses can be changed. However, the description of the first to fifth lenses can be the same. Additionally, since the sixth to ninth lenses are removed, the thickness written as corresponding to the image-side surface of the fifth lens is the distance between the fifth lens and the ninth lens, rather than the distance between the fifth lens and the sixth lens. Referring to Table 9, each surface of the first to fourth lenses and the sixth to ninth lenses can be formed into a convex shape or a concave shape.

[0205] The first lens L1 can be a lens with the object-side surface S11 bulging toward the object side. The first lens L1 can be a lens with the image-side surface S12 recessed toward the object side.

[0206] The second lens L2 can be a lens with the object-side surface L21 bulging toward the object side. The second lens L2 can be a lens with the image-side surface L22 bulging toward the object side.

[0207] Additionally, as shown in the drawings, the thickness T1 of the first lens L1 can correspond to the thickness written as corresponding to the object-side surface S11 of the first lens L1 in Table 1. Additionally, the thickness T2 of the second lens L2 can correspond to the thickness written as corresponding to the object-side surface L21 of the second lens L2 in Table 1. The thickness T3 of the third lens L3 can correspond to the thickness written as corresponding to the object-side surface S31 of the third lens L3 in Table 1. The thickness T4 of the fourth lens L4 can correspond to the thickness written as corresponding to the object-side surface S41 of the fourth lens L4 in Table 1. The thickness T6 of the sixth lens L6 can correspond to the thickness written as corresponding to the object-side surface S61 of the sixth lens L6 in Table 1. The thickness T7 of the seventh lens L7 can correspond to the thickness written as corresponding to the object-side surface S71 of the seventh lens L7 in Table 1. The thickness T8 of the eighth lens L8 can correspond to the thickness written as corresponding to the object-side surface S81 of the eighth lens L8 in Table 1. The thickness T9 of the ninth lens L9 can correspond to the thickness written as corresponding to the object-side surface S91 of the ninth lens L9 in Table 1.

[0208] Additionally, in this embodiment, the EFL is 12.0 in the wide-angle state and 19.4 in the telephoto state. The Fno is 2.29 in the wide-angle state and 3.71 in the telephoto state, and the HFOV is 12.68 in the wide-angle state and 8.03 in the telephoto state. In the case of the focal length, the total focal length f1 - f4 of the first to fourth lenses is 19.4, and the total focal length f6 - f9 of the sixth to ninth lenses is 9.29.

[0209] Referring to Figure 13 and Figure 15 , it can be seen that regardless of the wavelength, the longitudinal spherical aberration from the center to the end of the image sensor is in the range of -0.1 [mm] to 0.2 [mm]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the longitudinal spherical aberration is in the range of -0.1 [mm] to 0.2 [mm].

[0210] In addition, it can be seen that regardless of the wavelength, the astigmatic field curve from the center to the end of the image sensor is in the range of -0.1 [mm] to 0.2 [mm]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the astigmatic field curve is in the range of approximately -0.1 [mm] to 0.2 [mm].

[0211] In addition, it can be seen that regardless of the wavelength, the distortion from the center to the end of the image sensor is in the range of -2 [%] to 5 [%]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the distortion is in the range of approximately -2 [%] to 5 [%]. In particular, in the telephoto state, the distortion can be in the range of approximately -1 [%] to 1 [%].

[0212] Figure 16 is a cross-sectional view showing the optical system in the wide-angle state according to the third embodiment, and Figure 17 is a graph showing the longitudinal spherical aberration, the astigmatic field curve, and the distortion of light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the wide-angle state according to the third embodiment. Figure 18 is a cross-sectional view showing the optical system in the telephoto state according to the third embodiment, and Figure 19 is a graph showing the longitudinal spherical aberration, the astigmatic field curve, and the distortion of light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm in the optical system in the telephoto state according to the third embodiment.

[0213] In addition to the shapes shown in the drawings and the content to be described below, the above content can also be similarly applied to the following. Therefore, at least one or two or more of the formulas 1 to 38 described in Table 6 can also be satisfied by the optical system 10C according to the second embodiment.

[0214] [Table 10]

[0215]

[0216]

[0217] [Table 11]

[0218]

[0219]

[0220] [Table 12]

[0221]

[0222]

[0223] The unit of thickness is [mm]. In Table 12 and the like, the center thickness [mm] of the lens, the distance [mm] between the lenses, the curvature of the lens, the refractive index, and the Abbe number are shown. In addition, the unit of the general distance described in this specification is [mm]. In addition, in the process of zooming in the telephoto state, since the second lens group G2 is not aligned, the sixth to ninth lenses are removed. In addition, the characteristics of the removed sixth to ninth lenses can be changed. However, the description of the first to fifth lenses can be the same. In addition, since the sixth to ninth lenses are removed, the thickness corresponding to the image-side surface of the fifth lens is written as the distance between the fifth lens and the ninth lens, rather than the distance between the fifth lens and the sixth lens. Referring to Table 12, each surface of the first to fourth lenses and the sixth to ninth lenses can be formed into a convex shape or a concave shape.

[0224] The first lens L1 can be a lens with the object-side surface S11 bulging toward the object side. The first lens L1 can be a lens with the image-side surface S12 recessed toward the object side.

[0225] The second lens L2 can be a lens with the object-side surface L21 bulging toward the object side. The second lens L2 can be a lens with the image-side surface L22 bulging toward the object side.

[0226] In addition, as shown in the attached drawings, the thickness T1 of the first lens L1 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S11 of the first lens L1. In addition, the thickness T2 of the second lens L2 may correspond to the thickness written in Table 1 as corresponding to the object-side surface L21 of the second lens L2. The thickness T3 of the third lens L3 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S31 of the third lens L3. The thickness T4 of the fourth lens L4 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S41 of the fourth lens L4. The thickness T6 of the sixth lens L6 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S61 of the sixth lens L6. The thickness T7 of the seventh lens L7 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S71 of the seventh lens L7. The thickness T8 of the eighth lens L8 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S81 of the eighth lens L8. The thickness T9 of the ninth lens L9 may correspond to the thickness written in Table 1 as corresponding to the object-side surface S91 of the ninth lens L9.

[0227] In addition, in the present embodiment, the EFL is 11.9 in the wide-angle state and 20.5 in the telephoto state. The Fno is 1.99 in the wide-angle state and 3.42 in the telephoto state, and the HFOV is 12.73 in the wide-angle state and 7.57 in the telephoto state. In the case of the focal length, the total focal length f1-f4 of the first to fourth lenses is 20.59, and the total focal length f6-f9 of the sixth to ninth lenses is 8.35. Referring to Figure 17 and Figure 19 , it can be seen that regardless of the wavelength, the longitudinal spherical aberration from the center to the end of the image sensor is in the range of -0.05 [mm] to 0.05 [mm]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the longitudinal spherical aberration is in the range of -0.05 [mm] to 0.05 [mm].

[0228] In addition, it can be seen that regardless of the wavelength, the astigmatism field curve from the center to the end of the image sensor is in the range of -0.05 [mm] to 0.05 [mm]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the astigmatism field curve is in the range of approximately -0.05 [mm] to 0.05 [mm].

[0229] In addition, it can be seen that regardless of the wavelength, the distortion from the center to the end of the image sensor is in the range of -1 [%] to 2.5 [%]. Specifically, it can be seen that in each of the wide-angle state and the telephoto state, the distortion is in the range of approximately -1 [%] to 2.5 [%]. In particular, in the telephoto state, the distortion can be in the range of approximately -0.5 [%] to 1.5 [%].

[0230] Figure 20 It is a perspective view of a mobile terminal to which a camera device module according to an embodiment is applied.

[0231] As Figure 20 shown, the mobile terminal 1500 according to an embodiment may include a camera device module 1000, a flash module 1530, and an AF device 1510.

[0232] The camera device module 1000 may have an image capturing function and an AF function. For example, the camera device module 1000 may include an AF function using an image.

[0233] The camera device module 1000 processes image frames of still images or video images obtained by an image sensor in an image capturing state or a video call state.

[0234] The processed image frames may be displayed on a predetermined display and stored in a memory. A camera device (not shown) may also be provided on the front surface of the main body of the mobile terminal.

[0235] For example, the camera device module 1000 may include a first camera device module 1000 and a second camera device module 1000, and may use the first camera device module 10000 to implement an AF or zoom function and an OIS function.

[0236] The flash module 1530 may include a light emitting element that emits light. The flash module 1530 may be operated by the operation of the camera device of the mobile terminal or by the control of the user.

[0237] The AF device 1510 may include a package of surface emitting laser elements as light emitters.

[0238] The AF device 1510 may have an AF function using a laser. The AF device 1510 may be mainly used in an environment where the AF function using the image of the camera device module 1000 deteriorates, for example, under conditions of a proximity of 10 m or less, or in a dark environment.

[0239] The AF device 1510 may include a light emitter and a light receiver. The light emitter includes a vertical cavity surface emitting laser (VCSEL), and the light receiver is, for example, a photodiode that converts light energy into electrical energy.

[0240] Figure 21 It is a perspective view of a vehicle to which a camera device module according to an embodiment is applied.

[0241] For example, Figure 21 It is a view showing the appearance of a vehicle including a vehicle driving assistance device to which the camera device module 1000 according to an embodiment is applied.

[0242] Reference Figure 21 , the vehicle 700 of the embodiment may include wheels 13FL and 13FR and a predetermined sensor. The sensor may be a camera device sensor 2000, but is not limited thereto.

[0243] The camera device 2000 may be a camera sensor of the camera device module 1000 according to the embodiment. The vehicle 700 of the embodiment may obtain image information through the camera sensor 2000 that captures a front image or a surrounding image, determine a situation where a traffic line is not recognized using the image information, and generate an unrecognized traffic line.

[0244] For example, the camera sensor 2000 may obtain a front image by capturing an image facing forward from the vehicle 700, and a processor (not shown) may obtain image information by analyzing the objects included in the front image.

[0245] For example, when the image captured by the camera sensor 2000 includes images of objects such as vehicle lines, adjacent vehicles, obstacles obstructing driving, and indirect road markings corresponding to a median, a curb, and a roadside tree, the processor may detect the objects such that the objects may be included in the image information. In this case, the processor may obtain information on the objects and distances detected by the camera sensor 2000 to supplement the image information.

[0246] The image information may be information on the object whose image is captured. The camera sensor 2000 may include an image sensor and an image processing module.

[0247] The camera sensor 2000 may process still images or video images captured by an image sensor (such as a complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD)).

[0248] The image processing module may process still images and video images captured by the image sensor to extract required information and transmit the extracted information to the processor.

[0249] In this case, the camera sensor 2000 may include a stereo camera device to improve the measurement accuracy of the object and further ensure information on the distance between the vehicle 700 and the object, but is not limited thereto.

[0250] Although the present disclosure has been described with reference to the above-described embodiments, the embodiments are merely exemplary and do not limit the present specification, and those skilled in the art will understand that various changes and applications not shown above can be made without departing from the basic features of the present embodiment. For example, the components specifically described according to the embodiment can be modified. Additionally, such differences in modifications and applications should be understood to be included within the scope of the present specification defined by the appended claims.

Claims

1. An optical system, comprising: a first lens group, which is disposed adjacent to the object side and has a first optical axis; a second lens group, which is disposed adjacent to the image side and has a second optical axis; and a first optical path conversion member, which is disposed between the first lens group and the second lens group, wherein the second lens group is movable, when the center of the second lens group overlaps with the first optical path conversion member in the direction of the second optical axis, the optical system is in a wide-angle state, and when the center of the second lens group does not overlap with the first optical path conversion member in the direction of the second optical axis, the optical system is in a telephoto state.

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

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

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 greater than 5 mm.

5. 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 greater than 5 mm.

6. The optical system according to claim 1, wherein in the wide-angle state, the second lens group is aligned with and overlaps the first optical path conversion member along the second optical axis.

7. The optical system according to claim 1, wherein in the wide-angle state, the second lens group is aligned with the first optical path conversion member, and at least a part of the second lens group does not overlap with the first optical path conversion member along the second optical axis.

8. The optical system according to claim 1, wherein the ratio of the total lens length (TTL) to the back focal length (BFL) is in the range of 4 to 10.

9. An optical system, comprising: a first lens group; a second lens group, which is separately disposed from the first lens group; and a first optical path conversion member, which is disposed between the first lens group and the second lens group, wherein when light passes through the first lens group but not through the second lens group, the F-number (Fno) is 3.5 or less than 3.

5.

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

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