Optical imaging system

Abstract

This disclosure relates to an optical imaging system comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side; and an optical path conversion component disposed on the object side of the first lens, wherein the condition expression 1.3 < FNO ≤ 1.5 is satisfied, where FNO is a value representing the brightness (F number) of the optical imaging system.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0201621, filed on December 31, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an optical imaging system for a wide-angle camera, and more specifically, to an optical imaging system for a wide-angle camera including an optical path conversion component. Background Technology

[0004] Wide-angle cameras are perhaps the most widely used type of camera among all types of cameras mounted on mobile devices. Therefore, the image quality obtained by a wide-angle camera can significantly impact the performance of a mobile device as perceived by the user.

[0005] For example, to achieve high-quality images, high resolution is required, and this can be improved by reducing the F-number or using a large-size image sensor.

[0006] However, due to the size constraints of mobile devices, there is a need for methods that minimize the increase in camera size while achieving high resolution.

[0007] The above information is presented as background information and is intended to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0008] The summary portion of this invention is intended to provide a brief overview of the chosen concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0009] In one general aspect, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side; and an optical path conversion component disposed on the object side of the first lens, wherein the condition 1.3 < FNO ≤ 1.5 is satisfied, where FNO is a value (F number) representing the brightness of the optical imaging system.

[0010] At least one of the seventh and eighth lenses can be a D-shaped cut lens.

[0011] The conditional expression 0.8 < OAL / IMG HT < 0.9 can be satisfied, where OAL is the distance from the object side of the first lens to the imaging plane on the optical axis, and IMG HT is the diagonal length of the imaging plane.

[0012] It can satisfy the conditional expression 100° < FOV×IMG HT / f < 120°, where FOV is the field of view of the optical imaging system, IMG HT is the diagonal length of the imaging plane, and f is the total focal length of the optical imaging system.

[0013] It can satisfy the conditional expression 1.1 < FNO×(OAL / IMG HT) ≤ 1.3, where OAL is the distance from the object side of the first lens to the imaging plane on the optical axis, and IMG HT is the diagonal length of the imaging plane.

[0014] The condition expression 10 < V1-(V6+V7) / 2 < 30 can be satisfied, where V1 is the Abbe number of the first lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

[0015] It can satisfy the conditions 25 < V1-V2 < 45 and 0 ≤ V1-V4 < 10, where V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, and V4 is the Abbe number of the fourth lens.

[0016] The condition 0 < f1 / f < 1 can be satisfied, where f is the total focal length of the optical imaging system and f1 is the focal length of the first lens.

[0017] The first, third, and fourth lenses can have positive refractive power, while the second and fifth lenses can have negative refractive power.

[0018] The seventh lens can have positive refractive power, and the image-side surface of the seventh lens can be convex.

[0019] The eighth lens can have negative refractive power, and the image-side surface of the eighth lens can be concave.

[0020] In another general aspect, an optical imaging system includes: an optical path conversion member, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a refractive power, a fourth lens having a refractive power, a fifth lens having a negative refractive power, a sixth lens having a negative refractive power, a seventh lens having a refractive power, and an eighth lens having a refractive power, wherein the optical path conversion member changes the traveling path of light incident in a first optical axis direction to a second optical axis direction, wherein the first lens to the eighth lens are arranged in the second optical axis direction, and wherein the conditional expression 1.20 < OAL / f < 1.35 is satisfied, where OAL is the distance on the second optical axis from the object side surface of the first lens to the imaging surface, and f is the total focal length of the optical imaging system.

[0021] The conditional expression 2 < |f4 / f| < 4 can be satisfied, where f4 is the focal length of the fourth lens.

[0022] The seventh lens can have a positive refractive power and can satisfy the conditional expression 1 < f7 / f < 2, where f7 is the focal length of the seventh lens.

[0023] The eighth lens can have a negative refractive power and can satisfy the conditional expression -1 < f8 / f < 0, where f8 is the focal length of the eighth lens.

[0024] The conditional expression 1 < |f3 / f| / 10 < 5 can be satisfied, where f3 is the focal length of the third lens.

[0025] According to the following detailed description, the drawings, other features and aspects will be apparent. Description of the Drawings

[0026] Figure 1A is a configuration diagram showing an optical imaging system according to a first embodiment of the present disclosure.

[0027] Figure 1B is a graph showing the aberration characteristics of the optical imaging system according to the first embodiment of the present disclosure.

[0028] Figure 2A is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure.

[0029] Figure 2B is a graph showing the aberration characteristics of the optical imaging system according to the second embodiment of the present disclosure.

[0030] Figure 3A is a configuration diagram showing an optical imaging system according to a third embodiment of the present disclosure.

[0031] Figure 3BThis is a graph showing the aberration characteristics of an optical imaging system according to a third embodiment of the present disclosure.

[0032] Figure 4A This is a configuration diagram showing an optical imaging system according to a fourth embodiment of the present disclosure.

[0033] Figure 4B This is a graph showing the aberration characteristics of an optical imaging system according to a fourth embodiment of the present disclosure.

[0034] Figure 5A This is a configuration diagram showing an optical imaging system according to a fifth embodiment of the present disclosure.

[0035] Figure 5B This is a graph showing the aberration characteristics of an optical imaging system according to a fifth embodiment of the present disclosure.

[0036] Figure 6A This is a configuration diagram showing an optical imaging system according to a sixth embodiment of the present disclosure.

[0037] Figure 6B This is a graph showing the aberration characteristics of an optical imaging system according to a sixth embodiment of the present disclosure.

[0038] Figure 7A This is a configuration diagram showing an optical imaging system according to a seventh embodiment of the present disclosure.

[0039] Figure 7B This is a graph showing the aberration characteristics of an optical imaging system according to a seventh embodiment of the present disclosure.

[0040] Figure 8A This is a configuration diagram showing an optical imaging system according to an eighth embodiment of the present disclosure.

[0041] Figure 8B This is a graph showing the aberration characteristics of an optical imaging system according to an eighth embodiment of the present disclosure.

[0042] Figure 9A This is a configuration diagram showing an optical imaging system according to a ninth embodiment of the present disclosure.

[0043] Figure 9B This is a graph showing the aberration characteristics of an optical imaging system according to a ninth embodiment of the present disclosure.

[0044] Figure 10A This is a configuration diagram showing an optical imaging system according to a tenth embodiment of the present disclosure.

[0045] Figure 10B This is a graph showing the aberration characteristics of an optical imaging system according to the tenth embodiment of the present disclosure.

[0046] Throughout the accompanying drawings and detailed embodiments, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0047] In the following description, although examples of this disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0048] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0049] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding this disclosure.

[0050] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0051] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more items.

[0052] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0053] Spatial relative terms such as “above,” “above,” “below,” and “under” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “under” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0054] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0055] Due to manufacturing techniques and / or tolerances, the shapes shown in the accompanying drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0056] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0057] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0058] One aspect of this disclosure is to provide an optical imaging system that can achieve high resolution while having a structure less affected by the thickness limitations of mobile devices.

[0059] In the accompanying drawings, for ease of description, the thickness, size, and shape of the lens may be exaggerated, and the spherical or aspherical shape of the lens is merely an example and not a limitation.

[0060] In an embodiment, the first lens may refer to the lens closest to the object side, and the eighth lens may refer to the lens closest to the imaging surface (or image sensor).

[0061] Furthermore, in the embodiments, the units for the radius of curvature, thickness, distance, and focal length of the lens can be millimeters (mm), and the unit for the field of view can be degrees (°).

[0062] In the description relating to the shape of the lens in the embodiments, a convex surface may mean that a paraxial region (a narrow region near and including the optical axis) of the surface may be convex, and a concave surface may mean that a paraxial region of the surface may be concave. Therefore, even when one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Similarly, even when one surface of the lens is described as having a concave shape, the edge portion of the lens may be convex.

[0063] The optical imaging system according to an embodiment may include eight lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side.

[0064] However, the optical imaging system according to the embodiment may include more than eight lenses, and may also include other components if necessary.

[0065] The optical imaging system according to an embodiment may further include an image sensor configured to convert incident light from an object into an electrical signal.

[0066] In addition, for example, an optical imaging system may also include an infrared blocking filter (hereinafter referred to as a "filter") configured to block infrared light incident on an image sensor.

[0067] Furthermore, for example, the optical imaging system may also include a light path conversion component that can change the path of the incident light toward the image sensor. For example, the light path conversion component may be configured as a prism or mirror with a reflective surface.

[0068] Furthermore, the optical imaging system may also include an aperture configured to adjust the amount of light. For example, the aperture may be positioned between two adjacent optical elements.

[0069] The optical imaging system according to the embodiments may include a D-shaped cut lens. For example, at least one of the seventh lens and the eighth lens may be a D-shaped cut lens. In the embodiments, a D-shaped cut lens may refer to a lens having a shape including an arcuate portion and a straight portion along the edge.

[0070] The optical imaging system according to an embodiment may include lenses formed of a plastic material. For example, all of the first to eighth lenses may be formed of a plastic material.

[0071] According to an embodiment, at least one of the first to eighth lenses may have a shape with an inflection point. For example, at least one of the first to eighth lenses may include an inflection point on at least one of the object-side and image-side surfaces. The inflection point formed on the lens surface can reduce aberrations.

[0072] For example, the optical imaging system according to the embodiments may include inflection points on at least one or more of the image-side surface of the third lens, the object-side and image-side surfaces of the fifth lens, the object-side and image-side surfaces of the sixth lens, the object-side surface of the seventh lens, and the image-side surface of the eighth lens. The surfaces of the aforementioned lenses may have at least one inflection point. The shape of the lens surface may be simply shown in the drawings as convex or concave without clearly depicting any inflection points. However, the actual shape of the lens surface should be understood based on the radius of curvature corresponding to each embodiment.

[0073] Furthermore, at least one of the first to eighth lenses may have an aspherical surface. For example, both the object-side surface and the image-side surface of the first to eighth lenses may be aspherical. The aspherical surface of the first to eighth lenses can be represented by Equation 1.

[0074] Equation 1:

[0075] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the quadratic constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to H, J, and L to P are aspherical coefficients, and Z (SAG) is the distance along the optical axis between any point on the aspherical surface of the lens and the vertex of the aspherical surface.

[0076] The optical imaging system according to an embodiment may have two optical axes. For example, the optical imaging system according to an embodiment may have a first optical axis and a second optical axis that is substantially perpendicular to the first optical axis.

[0077] According to an embodiment, the first to eighth lenses can be sequentially arranged from the object side along the second optical axis. The optical path conversion member can change the travel path of light incident on the first optical axis to the second optical axis. For example, the optical path conversion member can be disposed on the object side of the first lens, and the first and second optical axes can intersect approximately at the center of the reflecting surface of the optical path conversion member.

[0078] The optical imaging system according to the embodiments can have a field of view (FOV) range similar to that of a wide-angle lens. For example, the optical imaging system according to the embodiments can have a field of view greater than 60° and less than 90°.

[0079] The optical imaging system according to the embodiment can satisfy one or more of the following conditional expressions.

[0080]

Conditional Expression 1

[0081]

Conditional Expression 2

[0082]

Conditional Expression 3

[0083]

Conditional Expression 4

[0084]

Conditional Expression 5

[0085]

Conditional Expression 6

[0086]

Conditional Expression 7

[0087]

Conditional Expression 8

[0088]

Conditional Expression 9

[0089]

Conditional Expression 10

[0090]

Conditional Expression 11

[0091]

Conditional Expression 12

[0092]

Conditional Expression 13

[0093]

Conditional Expression 14

[0094]

Conditional Expression 15

[0095]

Conditional Expression 16

[0096]

Conditional Expression 17

[0097]

Conditional Expression 18

[0098]

Conditional Expression 19

[0099]

Conditional Expression 20

[0100] In the conditional expression, FOV is the field of view of the optical imaging system, FNO is the value representing the brightness of the optical imaging system (F number), IMG HT is the diagonal length of the imaging surface of the image sensor, OAL is the distance from the object side of the first lens to the imaging surface on the (second) optical axis, BFL is the distance from the image side of the eighth lens to the imaging surface on the (second) optical axis, and D1 is the air gap between the first lens and the second lens (or the distance from the image side of the first lens to the object side of the second lens on the (second) optical axis).

[0101] Furthermore, in the conditional expression, f is the total focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.

[0102] Furthermore, in the conditional expression, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V4 is the Abbe number of the fourth lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

[0103] **Conditional Expression 1** can be related to the field of view and miniaturization of the optical imaging system. When **Conditional Expression 1** is satisfied, the optical imaging system has an appropriate field of view, can reduce distortion aberrations, and can be miniaturized. **Conditional Expression 2** can be related to the brightness of the optical imaging system. **Conditional Expression 3** can be a thin factor related to the miniaturization of the optical imaging system. **Conditional Expression 4** can be related to both the brightness and miniaturization of the optical imaging system. When **Conditional Expression 4** is satisfied, the optical imaging system can be miniaturized while maintaining appropriate brightness.

[0104] Conditional expressions 5 through 7 can be related to the material of the lens included in the optical imaging system. When conditional expressions 5 through 7 are satisfied, chromatic aberration in the optical imaging system can be improved.

[0105] Conditional expressions 8 through 15 are the ratios of the focal length of each lens to the total focal length of the optical imaging system, and conditions 16 and 17 are the ratios of the focal length of the second or third lens of the optical imaging system to the focal length of the first lens of the optical imaging system. When conditions 8 through 17 are satisfied, the optical imaging system can effectively correct aberrations.

[0106]

Conditional Expression 18

Conditional Expression 19

Conditional Expression 20

[0107] The optical imaging system according to the embodiments will now be described.

[0108] First Embodiment

[0109] Figure 1A This is a configuration diagram showing the optical imaging system according to the first embodiment. Figure 1B This is a graph showing the aberration characteristics of the optical imaging system according to the first embodiment.

[0110] The optical imaging system 100 according to the first embodiment may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an eighth lens 180.

[0111] Prism P can be disposed on the object side of the first lens 110 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 110 to the eighth lens 180 can be arranged sequentially in the direction of the second optical axis OA2.

[0112] The filter F and the image sensor S can be disposed on the image side of the eighth lens 180. The incident light can pass sequentially through the first lens 110 to the eighth lens 180 and the filter F, and can be received at the imaging surface (the plane on which the focal point is formed) IP of the image sensor S.

[0113] In addition, an aperture stop can be provided between the prism P and the first lens 110. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 110.

[0114] The first lens 110 may have positive refractive power. The object-side surface of the first lens 110 may be convex in the paraxial region, and the image-side surface of the first lens 110 may be concave in the paraxial region.

[0115] The second lens 120 may have negative refractive power. The object-side surface of the second lens 120 may be convex in the paraxial region, and the image-side surface of the second lens 120 may be concave in the paraxial region. The second lens 120 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0116] The third lens 130 can have positive refractive power. The object side of the third lens 130 can be convex in the paraxial region, and the image side of the third lens 130 can be concave in the paraxial region.

[0117] The fourth lens 140 can have positive refractive power. The object-side surface of the fourth lens 140 can be concave in the paraxial region, and the image-side surface of the fourth lens 140 can be convex in the paraxial region.

[0118] The fifth lens 150 may have negative refractive power. The object-side surface of the fifth lens 150 may be convex in the paraxial region, and the image-side surface of the fifth lens 150 may be concave in the paraxial region. The fifth lens 150 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0119] The sixth lens 160 can have negative refractive power. The object-side surface of the sixth lens 160 can be convex in the paraxial region, and the image-side surface of the sixth lens 160 can be concave in the paraxial region.

[0120] The seventh lens 170 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 170 can be convex in the paraxial region. The seventh lens 170 can be configured as a D-shaped cut lens.

[0121] The eighth lens 180 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 180 can be concave in the paraxial region. The eighth lens 180 can be configured as a D-shaped cut lens.

[0122] According to the first embodiment, the prism P can be formed of glass material, and the first lens 110 to the eighth lens 180 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 110 to the eighth lens 180 can be aspherical.

[0123] Table 1 lists the characteristics of each lens included in the optical imaging system 100 according to the first embodiment, and Table 2 lists the aspherical coefficients of each lens included in the optical imaging system 100 according to the first embodiment.

[0124] Table 1

[0125] Table 2

[0126] Second Embodiment

[0127] Figure 2A This is a configuration diagram showing an optical imaging system according to a second embodiment. Figure 2B This is a graph showing the aberration characteristics of the optical imaging system according to the second embodiment.

[0128] The optical imaging system 200 according to the second embodiment may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, and an eighth lens 280.

[0129] Prism P can be disposed on the object side of the first lens 210 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 210 to the eighth lens 280 can be arranged sequentially in the direction of the second optical axis OA2.

[0130] The filter F and the image sensor S can be disposed on the image side of the eighth lens 280. The incident light can pass sequentially through the first lens 210 to the eighth lens 280 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0131] In addition, an aperture stop can be provided between the prism P and the first lens 210. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 210.

[0132] The first lens 210 can have positive refractive power. The object-side surface of the first lens 210 can be convex in the paraxial region, and the image-side surface of the first lens 210 can be concave in the paraxial region.

[0133] The second lens 220 may have negative refractive power. The object-side surface of the second lens 220 may be convex in the paraxial region, and the image-side surface of the second lens 220 may be concave in the paraxial region. The second lens 220 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0134] The third lens 230 can have positive refractive power. The object-side surface of the third lens 230 can be convex in the paraxial region, and the image-side surface of the third lens 230 can be concave in the paraxial region.

[0135] The fourth lens 240 can have positive refractive power. The object-side surface of the fourth lens 240 can be concave in the paraxial region, and the image-side surface of the fourth lens 240 can be convex in the paraxial region.

[0136] The fifth lens 250 can have negative refractive power. The object-side surface of the fifth lens 250 can be convex in the paraxial region, and the image-side surface of the fifth lens 250 can be concave in the paraxial region. The fifth lens 250 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0137] The sixth lens 260 can have negative refractive power. The object-side surface of the sixth lens 260 can be convex in the paraxial region, and the image-side surface of the sixth lens 260 can be concave in the paraxial region.

[0138] The seventh lens 270 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 270 can be convex in the paraxial region. The seventh lens 270 can be configured as a D-shaped cut lens.

[0139] The eighth lens 280 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 280 can be concave in the paraxial region. The eighth lens 280 can be configured as a D-shaped cut lens.

[0140] According to the second embodiment, the prism P can be formed of glass material, and the first lens 210 to the eighth lens 280 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 210 to the eighth lens 280 can be aspherical.

[0141] Table 3 lists the characteristics of each lens included in the optical imaging system 200 according to the second embodiment, and Table 4 lists the aspherical coefficients of each lens included in the optical imaging system 200 according to the second embodiment.

[0142] Table 3

[0143] Table 4

[0144] Third Embodiment

[0145] Figure 3A This is a configuration diagram showing an optical imaging system according to a third embodiment. Figure 3B This is a graph showing the aberration characteristics of the optical imaging system according to the third embodiment.

[0146] The optical imaging system 300 according to the third embodiment may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, and an eighth lens 380.

[0147] Prism P can be disposed on the object side of the first lens 310 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 310 to the eighth lens 380 can be arranged sequentially in the direction of the second optical axis OA2.

[0148] The filter F and the image sensor S can be disposed on the image side of the eighth lens 380. The incident light can pass sequentially through the first lens 310 to the eighth lens 380 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0149] Furthermore, an aperture stop can be provided between the prism P and the first lens 310. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 310.

[0150] The first lens 310 can have positive refractive power. The object-side surface of the first lens 310 can be convex in the paraxial region, and the image-side surface of the first lens 310 can be concave in the paraxial region.

[0151] The second lens 320 may have negative refractive power. The object-side surface of the second lens 320 may be convex in the paraxial region, and the image-side surface of the second lens 320 may be concave in the paraxial region. The second lens 320 may be a high-refractive-index lens with a refractive index of 1.6 or greater.

[0152] The third lens 330 can have positive refractive power. The object-side surface of the third lens 330 can be convex in the paraxial region, and the image-side surface of the third lens 330 can be concave in the paraxial region.

[0153] The fourth lens 340 can have positive refractive power. The object-side surface of the fourth lens 340 can be concave in the paraxial region, and the image-side surface of the fourth lens 340 can be convex in the paraxial region.

[0154] The fifth lens 350 can have negative refractive power. The object-side surface of the fifth lens 350 can be convex in the paraxial region, and the image-side surface of the fifth lens 350 can be concave in the paraxial region. The fifth lens 350 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0155] The sixth lens 360 can have negative refractive power. The object-side surface of the sixth lens 360 can be convex in the paraxial region, and the image-side surface of the sixth lens 360 can be concave in the paraxial region.

[0156] The seventh lens 370 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 370 can be convex in the paraxial region. The seventh lens 370 can be configured as a D-shaped cut lens.

[0157] The eighth lens 380 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 380 can be concave in the paraxial region. The eighth lens 380 can be configured as a D-shaped cut lens.

[0158] According to the third embodiment, the prism P can be formed of glass material, and the first lens 310 to the eighth lens 380 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 310 to the eighth lens 380 can be aspherical.

[0159] Table 5 lists the characteristics of each lens included in the optical imaging system 300 according to the third embodiment, and Table 6 lists the aspherical coefficients of each lens included in the optical imaging system 300 according to the third embodiment.

[0160] Table 5

[0161] Table 6

[0162] Fourth embodiment

[0163] Figure 4A This is a configuration diagram showing an optical imaging system according to a fourth embodiment. Figure 4B This is a graph showing the aberration characteristics of the optical imaging system according to the fourth embodiment.

[0164] The optical imaging system 400 according to the fourth embodiment may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, and an eighth lens 480.

[0165] Prism P can be disposed on the object side of the first lens 410 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 410 to the eighth lens 480 can be arranged sequentially in the direction of the second optical axis OA2.

[0166] The filter F and the image sensor S can be disposed on the image side of the eighth lens 480. The incident light can pass sequentially through the first lens 410 to the eighth lens 480 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0167] In addition, an aperture stop can be provided between the prism P and the first lens 410. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 410.

[0168] The first lens 410 can have positive refractive power. The object-side surface of the first lens 410 can be convex in the paraxial region, and the image-side surface of the first lens 410 can be concave in the paraxial region.

[0169] The second lens 420 may have negative refractive power. The object-side surface of the second lens 420 may be convex in the paraxial region, and the image-side surface of the second lens 420 may be concave in the paraxial region. The second lens 420 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0170] The third lens 430 can have positive refractive power. The object-side surface of the third lens 430 can be convex in the paraxial region, and the image-side surface of the third lens 430 can be concave in the paraxial region.

[0171] The fourth lens 440 can have positive refractive power. The object-side surface of the fourth lens 440 can be concave in the paraxial region, and the image-side surface of the fourth lens 440 can be convex in the paraxial region.

[0172] The fifth lens 450 can have negative refractive power. The object-side surface of the fifth lens 450 can be convex in the paraxial region, and the image-side surface of the fifth lens 450 can be concave in the paraxial region. The fifth lens 450 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0173] The sixth lens 460 can have negative refractive power. The object-side surface of the sixth lens 460 can be convex in the paraxial region, and the image-side surface of the sixth lens 460 can be concave in the paraxial region.

[0174] The seventh lens 470 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 470 can be convex in the paraxial region. The seventh lens 470 can be configured as a D-shaped cut lens.

[0175] The eighth lens 480 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 480 can be concave in the paraxial region. The eighth lens 480 can be configured as a D-shaped cut lens.

[0176] According to the fourth embodiment, the prism P can be formed of glass material, and the first lens 410 to the eighth lens 480 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 410 to the eighth lens 480 can be aspherical.

[0177] Table 7 lists the characteristics of each lens included in the optical imaging system 400 according to the fourth embodiment, and Table 8 lists the aspherical coefficients of each lens included in the optical imaging system 400 according to the fourth embodiment.

[0178] Table 7

[0179] Table 8

[0180] Fifth Embodiment

[0181] Figure 5A This is a configuration diagram showing an optical imaging system according to a fifth embodiment. Figure 5B This is a graph showing the aberration characteristics of the optical imaging system according to the fifth embodiment.

[0182] The optical imaging system 500 according to the fifth embodiment may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, and an eighth lens 580.

[0183] Prism P can be disposed on the object side of the first lens 510 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 510 to the eighth lens 580 can be arranged sequentially in the direction of the second optical axis OA2.

[0184] The filter F and the image sensor S can be disposed on the image side of the eighth lens 580. The incident light can pass sequentially through the first lens 510 to the eighth lens 580 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0185] Furthermore, an aperture stop can be provided between the prism P and the first lens 510. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 510.

[0186] The first lens 510 can have positive refractive power. The object-side surface of the first lens 510 can be convex in the paraxial region, and the image-side surface of the first lens 510 can be concave in the paraxial region.

[0187] The second lens 520 may have negative refractive power. The object-side surface of the second lens 520 may be convex in the paraxial region, and the image-side surface of the second lens 520 may be concave in the paraxial region. The second lens 520 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0188] The third lens 530 can have positive refractive power. The object-side surface of the third lens 530 can be convex in the paraxial region, and the image-side surface of the third lens 530 can be concave in the paraxial region.

[0189] The fourth lens 540 can have positive refractive power. The object-side surface of the fourth lens 540 can be concave in the paraxial region, and the image-side surface of the fourth lens 540 can be convex in the paraxial region.

[0190] The fifth lens 550 can have negative refractive power. The object-side surface of the fifth lens 550 can be convex in the paraxial region, and the image-side surface of the fifth lens 550 can be concave in the paraxial region. The fifth lens 550 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0191] The sixth lens 560 can have negative refractive power. The object-side surface of the sixth lens 560 can be convex in the paraxial region, and the image-side surface of the sixth lens 560 can be concave in the paraxial region.

[0192] The seventh lens 570 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 570 can be convex in the paraxial region. The seventh lens 570 can be configured as a D-shaped cut lens.

[0193] The eighth lens 580 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 580 can be concave in the paraxial region. The eighth lens 580 can be configured as a D-shaped cut lens.

[0194] According to the fifth embodiment, the prism P can be formed of glass material, and the first lens 510 to the eighth lens 580 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 510 to the eighth lens 580 can be aspherical.

[0195] Table 9 lists the characteristics of each lens included in the optical imaging system 500 according to the fifth embodiment, and Table 10 lists the aspherical coefficients of each lens included in the optical imaging system 500 according to the fifth embodiment.

[0196] Table 9

[0197] Table 10

[0198] Sixth Embodiment

[0199] Figure 6A This is a configuration diagram showing an optical imaging system according to a sixth embodiment. Figure 6B This is a graph showing the aberration characteristics of the optical imaging system according to the sixth embodiment.

[0200] The optical imaging system 600 according to the sixth embodiment may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, and an eighth lens 680.

[0201] Prism P can be disposed on the object side of the first lens 610 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 610 to the eighth lens 680 can be arranged sequentially in the direction of the second optical axis OA2.

[0202] The filter F and the image sensor S can be disposed on the image side of the eighth lens 680. The incident light can pass sequentially through the first lens 610 to the eighth lens 680 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0203] Furthermore, an aperture stop can be provided between the prism P and the first lens 610. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 610.

[0204] The first lens 610 can have positive refractive power. The object-side surface of the first lens 610 can be convex in the paraxial region, and the image-side surface of the first lens 610 can be concave in the paraxial region.

[0205] The second lens 620 may have negative refractive power. The object-side surface of the second lens 620 may be convex in the paraxial region, and the image-side surface of the second lens 620 may be concave in the paraxial region. The second lens 620 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0206] The third lens 630 can have positive refractive power. The object-side surface of the third lens 630 can be convex in the paraxial region, and the image-side surface of the third lens 630 can be concave in the paraxial region.

[0207] The fourth lens 640 can have positive refractive power. The object-side surface of the fourth lens 640 can be concave in the paraxial region, and the image-side surface of the fourth lens 640 can be convex in the paraxial region.

[0208] The fifth lens 650 can have negative refractive power. The object-side surface of the fifth lens 650 can be convex in the paraxial region, and the image-side surface of the fifth lens 650 can be concave in the paraxial region. The fifth lens 650 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0209] The sixth lens 660 can have positive refractive power. The object-side surface of the sixth lens 660 can be convex in the paraxial region, and the image-side surface of the sixth lens 660 can be concave in the paraxial region.

[0210] The seventh lens 670 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 670 can be convex in the paraxial region. The seventh lens 670 can be configured as a D-shaped cut lens.

[0211] The eighth lens 680 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 680 can be concave in the paraxial region. The eighth lens 680 can be configured as a D-shaped cut lens.

[0212] According to the sixth embodiment, the prism P can be formed of glass material, and the first lens 610 to the eighth lens 680 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 610 to the eighth lens 680 can be aspherical.

[0213] Table 11 lists the characteristics of each lens included in the optical imaging system 600 according to the sixth embodiment, and Table 12 lists the aspherical coefficients of each lens included in the optical imaging system 600 according to the sixth embodiment.

[0214] Table 11

[0215] Table 12

[0216] Seventh Embodiment

[0217] Figure 7A This is a configuration diagram showing an optical imaging system according to the seventh embodiment. Figure 7B This is a graph showing the aberration characteristics of the optical imaging system according to the seventh embodiment.

[0218] The optical imaging system 700 according to the seventh embodiment may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, and an eighth lens 780.

[0219] Prism P can be disposed on the object side of the first lens 710 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 710 to the eighth lens 780 can be arranged sequentially in the direction of the second optical axis OA2.

[0220] The filter F and the image sensor S can be disposed on the image side of the eighth lens 780. The incident light can pass sequentially through the first lens 710 to the eighth lens 780 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0221] Furthermore, an aperture stop can be provided between the prism P and the first lens 710. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 710.

[0222] The first lens 710 can have positive refractive power. The object side of the first lens 710 can be convex in the paraxial region, and the image side of the first lens 710 can be concave in the paraxial region.

[0223] The second lens 720 may have negative refractive power. The object-side surface of the second lens 720 may be convex in the paraxial region, and the image-side surface of the second lens 720 may be concave in the paraxial region. The second lens 720 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0224] The third lens 730 can have positive refractive power. The object-side surface of the third lens 730 can be convex in the paraxial region, and the image-side surface of the third lens 730 can be concave in the paraxial region.

[0225] The fourth lens 740 can have positive refractive power. The object-side surface of the fourth lens 740 can be concave in the paraxial region, and the image-side surface of the fourth lens 740 can be convex in the paraxial region.

[0226] The fifth lens 750 can have negative refractive power. The object-side surface of the fifth lens 750 can be convex in the paraxial region, and the image-side surface of the fifth lens 750 can be concave in the paraxial region. The fifth lens 750 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0227] The sixth lens 760 can have negative refractive power. The object-side surface of the sixth lens 760 can be convex in the paraxial region, and the image-side surface of the sixth lens 760 can be concave in the paraxial region.

[0228] The seventh lens 770 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 770 can be convex in the paraxial region. The seventh lens 770 can be configured as a D-shaped cut lens.

[0229] The eighth lens 780 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 780 can be concave in the paraxial region. The eighth lens 780 can be configured as a D-shaped cut lens.

[0230] According to the seventh embodiment, the prism P can be formed of glass material, and the first lens 710 to the eighth lens 780 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 710 to the eighth lens 780 can be aspherical.

[0231] Table 13 lists the characteristics of each lens included in the optical imaging system 700 according to the seventh embodiment, and Table 14 lists the aspherical coefficients of each lens included in the optical imaging system 700 according to the seventh embodiment.

[0232] Table 13

[0233] Table 14

[0234] Eighth embodiment

[0235] Figure 8A This is a configuration diagram showing the optical imaging system according to the eighth embodiment. Figure 8B This is a graph showing the aberration characteristics of the optical imaging system according to the eighth embodiment.

[0236] The optical imaging system 800 according to the eighth embodiment may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, and an eighth lens 880.

[0237] Prism P can be disposed on the object side of the first lens 810 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 810 to the eighth lens 880 can be arranged sequentially in the direction of the second optical axis OA2.

[0238] The filter F and the image sensor S can be disposed on the image side of the eighth lens 880. The incident light can pass sequentially through the first lens 810 to the eighth lens 880 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0239] Furthermore, an aperture stop can be provided between the prism P and the first lens 810. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 810.

[0240] The first lens 810 can have positive refractive power. The object side of the first lens 810 can be convex in the paraxial region, and the image side of the first lens 810 can be concave in the paraxial region.

[0241] The second lens 820 may have negative refractive power. The object-side surface of the second lens 820 may be convex in the paraxial region, and the image-side surface of the second lens 820 may be concave in the paraxial region. The second lens 820 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0242] The third lens 830 can have positive refractive power. The object-side surface of the third lens 830 can be convex in the paraxial region, and the image-side surface of the third lens 830 can be concave in the paraxial region.

[0243] The fourth lens 840 can have positive refractive power. The object-side surface of the fourth lens 840 can be concave in the paraxial region, and the image-side surface of the fourth lens 840 can be convex in the paraxial region.

[0244] The fifth lens 850 can have negative refractive power. The object-side surface of the fifth lens 850 can be convex in the paraxial region, and the image-side surface of the fifth lens 850 can be concave in the paraxial region. The fifth lens 850 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0245] The sixth lens 860 can have negative refractive power. The object-side surface of the sixth lens 860 can be convex in the paraxial region, and the image-side surface of the sixth lens 860 can be concave in the paraxial region.

[0246] The seventh lens 870 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 870 can be convex in the paraxial region. The seventh lens 870 can be configured as a D-shaped cut lens.

[0247] The eighth lens 880 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 880 can be concave in the paraxial region. The eighth lens 880 can be configured as a D-shaped cut lens.

[0248] According to the eighth embodiment, the prism P can be formed of glass material, and the first lens 810 to the eighth lens 880 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 810 to the eighth lens 880 can be aspherical.

[0249] Table 15 lists the characteristics of each lens included in the optical imaging system 800 according to the eighth embodiment, and Table 16 lists the aspherical coefficients of each lens included in the optical imaging system 800 according to the eighth embodiment.

[0250] Table 15

[0251] Table 16

[0252] Ninth Embodiment

[0253] Figure 9A This is a configuration diagram showing an optical imaging system according to the ninth embodiment. Figure 9B This is a graph showing the aberration characteristics of the optical imaging system according to the ninth embodiment.

[0254] The optical imaging system 900 according to the ninth embodiment may include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, a seventh lens 970, and an eighth lens 980.

[0255] Prism P can be disposed on the object side of the first lens 910 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 910 to the eighth lens 980 can be arranged sequentially in the direction of the second optical axis OA2.

[0256] The filter F and the image sensor S can be disposed on the image side of the eighth lens 980. The incident light can pass sequentially through the first lens 910 to the eighth lens 980 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0257] Furthermore, an aperture stop can be provided between the prism P and the first lens 910. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 910.

[0258] The first lens 910 can have positive refractive power. The object-side surface of the first lens 910 can be convex in the paraxial region, and the image-side surface of the first lens 910 can be concave in the paraxial region.

[0259] The second lens 920 may have negative refractive power. The object-side surface of the second lens 920 may be convex in the paraxial region, and the image-side surface of the second lens 920 may be concave in the paraxial region. The second lens 920 may be a high-refractive-index lens with a refractive index of 1.6 or greater.

[0260] The third lens 930 can have positive refractive power. The object-side surface of the third lens 930 can be convex in the paraxial region, and the image-side surface of the third lens 930 can be concave in the paraxial region.

[0261] The fourth lens 940 can have positive refractive power. The object-side surface of the fourth lens 940 can be concave in the paraxial region, and the image-side surface of the fourth lens 940 can be convex in the paraxial region.

[0262] The fifth lens 950 can have negative refractive power. The object-side surface of the fifth lens 950 can be convex in the paraxial region, and the image-side surface of the fifth lens 950 can be concave in the paraxial region. The fifth lens 950 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0263] The sixth lens 960 can have negative refractive power. The object-side surface of the sixth lens 960 can be convex in the paraxial region, and the image-side surface of the sixth lens 960 can be concave in the paraxial region.

[0264] The seventh lens 970 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 970 can be convex in the paraxial region. The seventh lens 970 can be configured as a D-shaped cut lens.

[0265] The eighth lens 980 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 980 can be concave in the paraxial region. The eighth lens 980 can be configured as a D-shaped cut lens.

[0266] According to the ninth embodiment, the prism P can be formed of glass material, and the first lens 910 to the eighth lens 980 can be formed of plastic material. Furthermore, the object-side and image-side surfaces of the first lens 910 to the eighth lens 980 can be aspherical.

[0267] Table 17 lists the characteristics of each lens included in the optical imaging system 900 according to the ninth embodiment, and Table 18 lists the aspherical coefficients of each lens included in the optical imaging system 900 according to the ninth embodiment.

[0268] Table 17

[0269] Table 18

[0270] Tenth Embodiment

[0271] Figure 10A This is a configuration diagram showing an optical imaging system according to the tenth embodiment. Figure 10B This is a graph showing the aberration characteristics of the optical imaging system according to the tenth embodiment.

[0272] The optical imaging system 1000 according to the tenth embodiment may include a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, a sixth lens 1060, a seventh lens 1070, and an eighth lens 1080.

[0273] Prism P can be disposed on the object side of the first lens 1010 as an optical path conversion component. Prism P can bend the path of light incident in the direction of the first optical axis OA1 to the direction of the second optical axis OA2. The first lens 1010 to the eighth lens 1080 can be arranged sequentially in the direction of the second optical axis OA2.

[0274] The filter F and the image sensor S can be disposed on the image side of the eighth lens 1080. The incident light can pass sequentially through the first lens 1010 to the eighth lens 1080 and the filter F, and can be received at the imaging surface IP of the image sensor S.

[0275] Furthermore, an aperture stop can be provided between the prism P and the first lens 1010. Specifically, the aperture stop can be provided between the exit surface of the prism P and the first lens 1010.

[0276] The first lens 1010 may have positive refractive power. The object-side surface of the first lens 1010 may be convex in the paraxial region, and the image-side surface of the first lens 1010 may be concave in the paraxial region.

[0277] The second lens 1020 may have negative refractive power. The object-side surface of the second lens 1020 may be convex in the paraxial region, and the image-side surface of the second lens 1020 may be concave in the paraxial region. The second lens 1020 may be a high refractive index lens with a refractive index of 1.6 or greater.

[0278] The third lens 1030 can have positive refractive power. The object-side surface of the third lens 1030 can be convex in the paraxial region, and the image-side surface of the third lens 1030 can be concave in the paraxial region.

[0279] The fourth lens 1040 can have positive refractive power. The object-side surface of the fourth lens 1040 can be concave in the paraxial region, and the image-side surface of the fourth lens 1040 can be convex in the paraxial region.

[0280] The fifth lens 1050 can have negative refractive power. The object-side surface of the fifth lens 1050 can be convex in the paraxial region, and the image-side surface of the fifth lens 1050 can be concave in the paraxial region. The fifth lens 1050 can be a high refractive index lens with a refractive index of 1.6 or greater.

[0281] The sixth lens 1060 can have positive refractive power. The object-side surface of the sixth lens 1060 can be convex in the paraxial region, and the image-side surface of the sixth lens 1060 can be concave in the paraxial region.

[0282] The seventh lens 1070 can have positive refractive power. The object-side and image-side surfaces of the seventh lens 1070 can be convex in the paraxial region. The seventh lens 1070 can be configured as a D-shaped cut lens.

[0283] The eighth lens 1080 can have negative refractive power. The object-side surface of the eighth lens 1080 can be convex in the paraxial region, and the image-side surface of the eighth lens 1080 can be concave in the paraxial region. The eighth lens 1080 can be configured as a D-shaped cut lens.

[0284] According to the tenth embodiment, the prism P can be formed of glass material, and the first lens 1010 to the eighth lens 1080 can be formed of plastic material. Furthermore, the object-side surface and image-side surface of the first lens 1010 to the eighth lens 1080 can be aspherical.

[0285] Table 19 lists the characteristics of each lens included in the optical imaging system 1000 according to the tenth embodiment, and Table 20 lists the aspherical coefficients of each lens included in the optical imaging system 1000 according to the tenth embodiment.

[0286] Table 19

[0287] Table 20

[0288] Table 21 lists the optical and physical characteristics of the optical imaging system according to the embodiments, and Table 22 lists the values ​​of the conditional expressions according to the embodiments.

[0289] Table 21

[0290] Table 22

[0291] According to the above embodiments, it is feasible to apply the optical imaging system in mobile devices with a thin profile, and the application can provide high-quality images.

[0292] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, including: The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are arranged sequentially from the object side; as well as The optical path conversion component is disposed on the object side of the first lens. Among them, the condition 1.3 < FNO ≤ 1.5 is satisfied. Wherein, FNO is a value representing the brightness of the optical imaging system, and, The optical imaging system has a total of eight lenses.

2. The optical imaging system of claim 1, wherein, At least one of the seventh lens and the eighth lens is a D-shaped cut lens.

3. The optical imaging system of claim 1, wherein, The conditional expression 0.8 < OAL / IMG HT < 0.9 is satisfied. Wherein, OAL is the distance from the object side of the first lens to the imaging surface along the optical axis, and IMG HT is the diagonal length of the imaging surface.

4. The optical imaging system according to claim 1, wherein, The conditional expression 100° < FOV×IMG HT / f < 120° is satisfied. Wherein, FOV is the field of view of the optical imaging system, IMG HT is the diagonal length of the imaging plane, and f is the total focal length of the optical imaging system.

5. The optical imaging system according to claim 1, wherein, The conditional expression 1.1 < FNO×(OAL / IMGHT) ≤ 1.3 is satisfied. Wherein, OAL is the distance from the object side of the first lens to the imaging surface along the optical axis, and IMG HT is the diagonal length of the imaging surface.

6. The optical imaging system according to claim 1, wherein, The conditional expression 10 < V1-(V6+V7) / 2 < 30 is satisfied. Wherein, V1 is the Abbe number of the first lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

7. The optical imaging system according to claim 1, wherein, The conditions 25 < V1 - V2 < 45 and 0 ≤ V1 - V4 < 10 are satisfied. Wherein, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, and V4 is the Abbe number of the fourth lens.

8. The optical imaging system according to claim 1, wherein, The conditional expression 0 < f1 / f < 1 is satisfied. Where f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

9. The optical imaging system according to claim 1, wherein, The first lens, the third lens, and the fourth lens have positive refractive power, while the second lens and the fifth lens have negative refractive power.

10. The optical imaging system according to claim 1, wherein, The seventh lens has positive refractive power, and the image-side surface of the seventh lens is convex.

11. The optical imaging system according to claim 1, wherein, The eighth lens has negative refractive power, and the image-side surface of the eighth lens is concave.

12. An optical imaging system, including: The optical path conversion component includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with negative refractive power, a sixth lens with negative refractive power, a seventh lens with refractive power, and an eighth lens with refractive power. Specifically, the optical path conversion component changes the travel path of light incident along the first optical axis to the second optical axis. The first lens to the eighth lens are positioned along the second optical axis. Among them, the conditional expression 1.20 < OAL / f < 1.35 is satisfied. Where OAL is the distance from the object side of the first lens to the imaging plane along the second optical axis, and f is the total focal length of the optical imaging system. The optical imaging system has a total of eight lenses.

13. The optical imaging system according to claim 12, wherein, The conditional expression 2 < |f4 / f| < 4 is satisfied. Where f4 is the focal length of the fourth lens.

14. The optical imaging system according to claim 12, wherein, The seventh lens has positive refractive power and satisfies the condition 1 < f7 / f < 2. Where f7 is the focal length of the seventh lens.

15. The optical imaging system according to claim 12, wherein, The eighth lens has negative refractive power and satisfies the conditional expression -1 < f8 / f < 0. Where f8 is the focal length of the eighth lens.

16. The optical imaging system according to claim 12, wherein, The conditional expression 1 < |f3 / f| / 10 < 5 is satisfied. Where f3 is the focal length of the third lens.

Images