KR20190088716A - Optical imaging system for optical angle - Google Patents

Abstract

The present invention relates to an optical imaging system for an optical angle, capable of improving visibility of a subject to be photographed using six lenses and photographing the subject in a wide range. Moreover, the optical imaging system for an optical angle provides an image in which distortion is corrected and can provide the image of high resolution. To achieve the purpose of the present invention, the optical imaging system for an optical angle has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are aligned in order from the subject to the upper surface along an optical axis. The first lens and the sixth lens have negative refracting power, and the second lens and the fifth lens have a positive refracting power. The third lens has an incidence plane and an emission plane, which are in a convex shape. The fourth lens has the incidence plane and the emission plane, which are in a concave shape. Also, an interaction formula which is 3.5 < ¦F1/F¦ < 4.5 is established. F1 is a focal distance of the first lens, and F is the focal distance in the whole of the optical system.

Description

[0001] OPTICAL IMAGING SYSTEM FOR OPTICAL ANGLE [0002]

Field of the Invention [0002] The present invention relates to a wide-angle imaging optical system, and more particularly to a wide-angle imaging optical system capable of improving sharpness of a photographed subject, photographing a wider range of subjects, providing an image in which distortion aberration is corrected, Angle imaging optical system capable of providing a high-resolution image.

Recently, the use of mobile phone cameras and digital cameras has been increasing, and demands for diversification of services such as photographing, image transmission, and communication have been intensified.

For example, the demand for mobile phone cameras is getting stronger. In addition, the mobile phone has been widely recognized as a concept smart phone that combines digital camera technology and mobile phone technology, and the camera technology embedded in the smart phone has become a significant influence on the sales of the smartphone. Accordingly, with the development of a smartphone, a camera module which requires an improvement in brightness, an improvement in sharpness, and a wide screen is being developed.

In addition, as devices that connect computers or smart phones are developed using USB, Bluetooth, etc., it is possible to implement virtual reality, motion recognition, and augmented reality through equipment, and there are many applications of shooting optical systems in various games and everyday life It is a trend.

 As a core component of such devices, a camera module and an image pickup device are included. As the related equipment develops, a wide viewing angle of core parts is desired, and a reduction in size is demanded, and development of a higher performance lens module is required .

However, the wide angle, high resolution and high performance of the imaging lens are required, and it is difficult to realize the high-performance performance required by the user with 4 to 5 photographing lenses, and the optical characteristics and the aberration characteristics are satisfied, It is difficult to do.

Korean Patent Laid-Open Publication No. 10-2017-0137022 (titled "imaging optical system," published Dec. 12, 2017)

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the prior art. By using six lenses, it is possible to improve the sharpness of a photographed subject, to photograph a wider range of subjects, Angle imaging optical system capable of providing a high-resolution image.

According to a preferred embodiment of the present invention, the wide-angle imaging optical system according to the present invention includes a first lens, The fifth lens and the sixth lens are arranged in order, the first lens and the sixth lens have a negative refracting power, the second lens and the fifth lens have a positive refracting power, The lens has a convex shape in which both an incident surface and an emergent surface are convex, and the fourth lens has a concave shape in both an incident surface and an emergent surface, and a relation of 3.5 <? F1 / F? 4.5 is established. Here, F1 is the focal length of the first lens, and F is the focal length of the entire optical system.

The relationship of 5.0 < lR / R2 < 7.0 is additionally established in the wide-angle imaging optical system according to the present invention. Here, R1 is the radius of curvature of the first incident portion formed on the incident surface of the first lens, and R2 is the radius of curvature of the first exit portion formed on the exit surface of the first lens.

The relationship of 120 deg. &Lt; FOV < 170 deg. Is further established in the wide-angle imaging optical system according to the present invention. At this time, the FOV is called an angle of view.

Here, the third lens has a positive refractive power, and the fourth lens has a negative refractive power.

The wide-angle imaging optical system according to the present invention further includes a diaphragm for adjusting an amount of light incident on the upper surface.

Here, the entrance surface and the exit surface of the first lens are each a spherical surface.

Here, the incident surface and the exit surface of each of the second lens to the sixth lens are aspherical surfaces.

Here, a first incidence portion convex on the basis of the object side is formed on the incident surface of the first lens, a first emergence portion concave with reference to the upper surface side is formed on the emergence surface of the first lens, Is smaller than the diameter of the first emitting portion.

Here, a second incident portion convex on the object side is formed on the incident surface of the second lens, a second exit portion concave on the upper surface side is formed on the exit surface of the second lens, Is smaller than the diameter of the second emitting portion.

Here, the diameter of the sixth lens is equal to or smaller than the diameter of the first emitting portion.

According to the wide-angle imaging optical system of the present invention, by using six lenses, it is possible to improve the sharpness of a photographed subject, to photograph a wider range of subjects, to provide an image with distortion aberration correction, .

Further, the present invention can appropriately design the refractivity, the shape, the incident angle of the principal ray, the lens interval, etc. of the lens to provide a wide-angle image that is small and lightweight and has a view angle of 100 degrees or more

In addition, the lens module of the present invention is required to have a wide angle, high resolution, and high performance, and is capable of realizing high-performance performance required by a user through six lens modules and satisfying optical characteristics and aberration characteristics, Implementation is possible.

INDUSTRIAL APPLICABILITY The present invention can be used in a digital camera such as a camera or a digital camera, a surveillance camera, a computer camera, a mobile phone camera or the like that requires an optical system for virtual reality, motion recognition, image formation in the infrared region,

1 is a view showing a wide-angle imaging optical system according to a first embodiment of the present invention.
2 is a diagram showing an aberration diagram of the wide-angle imaging optical system according to the first embodiment of the present invention.
3 is a diagram showing a wide-angle imaging optical system according to a second embodiment of the present invention.
4 is a diagram showing an aberration diagram of the wide-angle imaging optical system according to the second embodiment of the present invention.
5 is a diagram showing a wide-angle imaging optical system according to the third embodiment of the present invention.
6 is a diagram showing an aberration diagram of the wide-angle imaging optical system according to the third embodiment of the present invention.

Hereinafter, an embodiment of a wide-angle imaging optical system according to the present invention will be described with reference to the accompanying drawings. Here, the present invention is not limited or limited by the examples. Further, in describing the present invention, a detailed description of well-known functions or constructions may be omitted for clarity of the present invention.

In the following description, the upper surface IMG represents a surface on which the image is formed, and the upper surface IMG side may indicate the position of an image pickup device or the like such as an image sensor. The lens surface on the object OBJ side is defined as the incident surface and the lens surface on the image surface IMG side is defined as the exit surface in both the two surfaces of each lens.

In the wide-angle imaging optical system of the present invention, the object OBJ side and the top side IMG side may be opposite to each other with respect to the lens module. Further, in the wide-angle imaging optical system of the present invention, since the optical axis OA is bent according to the installation of the prism P, the side of the object OBJ can indicate the direction facing the prism P.

1 and 2, the wide-angle imaging optical system 100 according to the first embodiment of the present invention may include a lens module arranged from the object OBJ side to the image plane IMG side. Here, the lens module includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150 and a sixth lens 160, . &Lt; / RTI &gt; Further, the lens module may further include an optical filter (OF), and may further include a diaphragm (ST).

In the first embodiment of the present invention, the upper surface IMG is formed in a planar shape. In other words, the upper surface IMG of the image pickup device is made up of a plane perpendicular to the optical axis OA.

In the first embodiment of the present invention, the object OBJ may be spherical or aspherical.

The first lens 110 has a convex meniscus shape on the object OBJ side. On the incident surface of the first lens 110, a first incidence portion 111 convex on the object OBJ side is formed. A concave first emitting portion 112 is formed on the emitting surface of the first lens 110 with reference to the upper surface IMG. The first supporting part 113 extending from the first boundary 114 indicating the edge of the first emitting part 112 is formed on the emitting surface of the first lens 110 so that the first incident part 111 It is possible to prevent the leakage of the light incident thereon. The first support portion 113 may have a planar shape corresponding to a plane perpendicular to the optical axis OA.

At this time, the radius of curvature of the first incident portion 111 is formed to be larger than the radius of curvature of the first emitting portion 112 with respect to the upper surface (IMG) side to serve as a concave lens. Accordingly, the first lens 110 has a negative refractive power.

Both the first incident portion 111 and the first emitting portion 112 may be spherical.

The diameter of the first incident portion 111 is larger than the diameter of the first exit portion 112 so that all the light incident on the first incident portion 111 is emitted through the first exit portion 112, Contributing to downsizing of the display device 100 and increasing the angle of view (FOV).

The second lens 120 has a positive refractive power. The second lens 120 has a convex meniscus shape on the object OBJ side. On the incident surface of the second lens 120, a convex second incident portion 121 is formed with reference to the object OBJ side. A convex second output portion 122 is formed on the exit surface of the second lens 120 with reference to the upper surface IMG. The second supporting portion 123 extending from the second boundary 124 indicating the edge of the second emitting portion 122 is formed on the emitting surface of the second lens 120 so that the second incident portion 121 It is possible to prevent the leakage of the light incident thereon. The second support portion 123 may have a planar shape corresponding to a plane perpendicular to the optical axis OA.

At this time, the radius of curvature of the second incident portion 121 is positive and the radius of curvature of the second exit portion 122 is negative with respect to the upper surface IMG. The second light output portion 122 may be formed to be parallel to a plane perpendicular to the optical axis OA or concave with respect to the image plane IMG, and may serve as a convex lens.

The second incident portion 121 and the second incident portion 122 may all be aspherical.

The diameter of the second lens 120 is smaller than the diameter of the first lens 110 so that light transmitted through the first exit part 112 is incident on the second incident part 121, Contributing to downsizing of the display device, and increasing the angle of view (FOV). Particularly, the diameter of the second lens 120 is smaller than the diameter of the first exit part 112 so that light transmitted through the first exit part 112 is incident on the second incident part 121, Contributes to miniaturization of the optical system 100, and the angle of view (FOV) can be increased.

The diameter of the second incident portion 121 is formed to be larger than the diameter of the second exit portion 122 so that all the light incident on the second incident portion 121 is emitted through the second exit portion 122, Contributing to downsizing of the display device 100 and increasing the angle of view (FOV).

The third lens 130 has a shape in which both an incident surface and an exit surface are convex. On the incident surface of the third lens 130, a convex third incident portion 131 is formed with reference to the object OBJ side. A diaphragm seating part for seating the diaphragm ST may be formed on the incident surface of the third lens 130. [ The iris seating part may extend from the edge of the third incident portion 131. A convex third output portion 132 is formed on the exit surface of the second lens 120 with reference to the upper surface IMG.

At this time, the radius of curvature of the third incident portion 131 is positive and the radius of curvature of the third light exiting portion 132 is negative with respect to the upper surface IMG, and can serve as a convex lens. The second emitting portion 122 may be substantially flat or may have a concave shape with respect to the upper surface (IMG) side to serve as a convex lens. Accordingly, the third lens 130 has a positive refractive power.

The third incident portion 131 and the third incident portion 132 may all be aspherical.

The diameter of the third lens 130 is smaller than the diameter of the second lens 120 so that the light transmitted through the second output portion 122 is incident on the third incident portion 131, Contributing to downsizing of the display device, and increasing the angle of view (FOV). Particularly, the diameter of the third lens 130 is smaller than the diameter of the second exit part 122, so that light transmitted through the second exit part 122 is incident on the third incident part 131, Contributes to miniaturization of the optical system 100, and the angle of view (FOV) can be increased.

The diameter of the third incident portion 131 is formed to be equal to or smaller than the diameter of the third incident portion 132 so that all the light incident on the third incident portion 131 is emitted through the third incident portion 132 , Contributing to downsizing of the optical system 100, and increasing the angle of view (FOV).

The fourth lens 140 has a shape in which both an incident surface and an exit surface are concave. On the incident surface of the fourth lens 140, a fourth incident portion 141 concaved with reference to the object OBJ side is formed. The third supporting portion 142 extending from the third boundary 143 indicating the edge of the fourth incident portion 141 is formed on the incident surface of the fourth lens 140 so that the fourth incident portion 141 It is possible to prevent the leakage of the light incident thereon. The third support portion 142 may be inclined downward toward the edge of the fourth lens 140 or may have a planar shape corresponding to a plane perpendicular to the optical axis OA. A fourth exit part 144 is formed on the exit surface of the fourth lens 140, with the concave fourth exit part 144 as a reference with respect to the upper surface IMG. A lens projection 145 protrudes from the exit surface of the fourth lens 140. The lens protrusion 145 is formed with a protruding surface that is inclined upward from the edge of the fourth emitting portion 144 toward the edge of the fourth lens 140 and the side of the upper surface IMG.

At this time, the radius of curvature of the third incident portion 131 is negative and the radius of curvature of the third emitting portion 132 is a positive number with respect to the upper surface (IMG) side, and can serve as a concave lens. Accordingly, the fourth lens 140 has a negative refractive power.

The fourth incident portion 141 and the fourth incident portion 144 may all be aspherical.

The diameter of the fourth lens 140 is larger than the diameter of the third lens 130 so that light transmitted through the third output portion 132 is incident on the fourth incident portion 141, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the fourth incident portion 141 is smaller than the diameter of the fourth exit portion 144 by the third support portion 142 so that all the light incident on the fourth incident portion 141 is reflected by the fourth exit portion 144 , Contributing to the miniaturization of the optical system 100, and increasing the angle of view (FOV).

The fifth lens 150 has a positive refractive power. The fifth lens 150 has a convex meniscus shape on the upper surface IMG side. On the incident surface of the fifth lens 150, a fifth incident portion 151 recessed with reference to the object OBJ side is formed. The fifth lens 150 may have a protruding support portion on which the lens protrusion 145 is supported. The projecting support portion can be engaged with the lens projection 145. A fifth emitting portion 152 convex on the upper surface IMG side is formed on the emitting surface of the fifth lens 150. The curved exit portion may be formed on the exit surface of the fifth lens 150, the curved exit portion extending from the edge of the fifth exit 152 and changing the radius of curvature through the inflection point. The inflection point may indicate a point where the sign of the radius of curvature changes from (+) to (-) or changes from (-) to (+). The inflection point may indicate a point where the shape of the lens changes from convex to concave or from concave to convex. The exit surface of the fifth lens 150 has a convex shape near the optical axis OA with respect to the upper surface IMG and has a concave shape as it goes from the optical axis OA to the edge of the fifth lens 150 have.

At this time, the radius of curvature of the fifth incident portion 151 and the radius of curvature of the fifth exit portion 152 are negative, and the radius of curvature of the fifth incident portion 151 is the radius of curvature of the fifth exit portion 151, Is formed to be smaller than the radius of curvature of the convex lens 152 and can serve as a convex lens. In other words, the radius of curvature of the fifth incident portion 151 is formed to be larger than the radius of curvature of the fifth exit portion 152 with respect to the object OBJ side, and can serve as a convex lens.

The fifth incident portion 151 and the fifth incident portion 152 may all be aspherical.

The diameter of the fifth lens 150 is formed to be larger than the diameter of the fourth lens 140 so that light transmitted through the fourth exit portion 144 is incident on the fifth incident portion 151, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the fifth incident portion 151 is formed to be substantially equal to the diameter of the fifth exit portion 152 so that all the light incident on the fifth incident portion 151 is emitted through the fifth exit portion 152 Contributing to downsizing of the optical system 100, and increasing the angle of view (FOV).

The sixth lens 160 has a negative refractive power. On the incident surface of the sixth lens 160, a sixth incident portion 161 convex on the object OBJ side is formed. The fourth supporting portion 162 extending from the fourth boundary 163 indicating the edge of the sixth incidence portion 161 is formed on the incident surface of the sixth lens 160 so that the fifth emergence portion 152 It is possible to prevent leakage of light transmitted from the inflection and emission unit 153. The fourth support portion 162 may have a planar shape corresponding to a plane perpendicular to the optical axis OA. A sixth exit portion 164 is formed on the exit surface of the sixth lens 160 with a concave reference with respect to the upper surface IMG.

An incidence curved portion extending from the edge of the sixth incident portion 161 and changing its curvature through at least one inflection point is formed on the incident surface of the sixth lens 160. Further, on the exit surface of the sixth lens 160, an exit curve portion extending from the edge of the sixth exit portion 164 and changing its curvature through at least one inflection point is formed. The inflection point may indicate a point where the sign of the radius of curvature changes from (+) to (-) or changes from (-) to (+). The inflection point may indicate a point where the shape of the lens changes from convex to concave or from concave to convex. The incident surface of the sixth lens 160 has a convex shape near the optical axis OA as a reference and may have a concave shape from the optical axis OA to the edge of the sixth lens 160. The exit surface of the sixth lens 160 has a concave shape near the optical axis OA with respect to the upper surface IMG and has a convex shape from the optical axis OA to the edge of the sixth lens 160 have. At this time, the thickness of the sixth lens 160 gradually increases from the optical axis OA toward the edge of the sixth lens 160.

At this time, the radius of curvature of the sixth incident portion 161 and the radius of curvature of the sixth exit portion 164 are positive, and the radius of curvature of the sixth incident portion 161 is positive with respect to the upper surface (IMG) Is formed to be larger than the radius of curvature of the concave lens 164 and can serve as a concave lens. In other words, the thickness of the sixth lens 160 may be gradually increased from the optical axis OA toward the edge of the sixth lens 160 to serve as a concave lens.

The sixth incident portion 161 and the sixth exit portion 164 may all be aspherical.

The diameter of the sixth lens 160 is larger than the diameter of the fifth lens 150 so that the light transmitted through the fifth exit 152 and the curved exit 153 passes through the sixth incidence 161, It is possible to cause the optical system 100 to be miniaturized, and the angle of view (FOV) can be increased. Particularly, the diameter of the incidence surface of the sixth lens 160 excluding the fourth support portion 162, or the diameter of the incidence surface of the sixth lens 160 including the sixth incidence portion 161 and the incidence bent portion, And the light transmitted through the fifth emitting portion 152 and the inflection and emission portion 153 is incident on both the sixth incident portion 161 and the incidence bent portion of the optical system 100, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the sixth lens 160 including the sixth incidence portion 161 and the incidence bent portion is formed smaller than the diameter of the sixth lens 160 including the sixth exit portion 164 and the exit curved portion, Both of the light incident on the light emitting portion 161 and the incident incidence portion are emitted through the sixth light output portion 164 and the outgoing light incidence portion so as to contribute to the miniaturization of the optical system 100 and to increase the angle of view FOV.

Further, the diameter of the sixth lens 160 is formed to be equal to or smaller than the diameter of the first exit 112, contributing to the miniaturization of the optical system 100, and enabling the angle of view (FOV) to be increased.

The distance D11 between the first lens 110 and the second lens 120 in the wide-angle imaging optical system 100 according to the first embodiment of the present invention is formed larger than the distance between the other lenses, It is possible to stably satisfy the design conditions according to the first embodiment of the present invention.

The distance D11 between the first lens 110 and the second lens 120 is the largest in the first embodiment of the present invention and the distance between the second lens 120 and the third lens 130 It is possible to stably collect light in a state where the distance D12 is large and the angle of view is large, and the design conditions according to the first embodiment of the present invention can be stably satisfied.

In the first embodiment of the present invention, the thickness of the first lens 110 is equal to or greater than the distance D11 between the first lens 110 and the second lens 120, And can stably satisfy the design conditions according to the first embodiment of the present invention.

At least one optical filter (OF) is disposed between the sixth lens (160) and the upper surface (IMG). As the optical filter (OF), a low pass filter, an IR-cut filter, a cover glass, or the like can be used.

A filter incident portion OF1 facing the sixth lens 160 on the object OBJ side is formed on the incident surface of the optical filter OF. A filter output portion OF2 facing the upper surface IMG on the upper surface IMG side is formed on the exit surface of the optical filter OF. The filter incident portion OF1 and the filter output portion OF2 may each have a planar shape substantially perpendicular to the optical axis OA. Accordingly, the optical filter OF can exhibit a flat plate shape.

The diameter of the optical filter OF is formed to be larger than the diameter of the sixth lens 160 so that the light transmitted through the sixth output portion 164 and the output curved portion stably passes through the optical filter OF, 100), and the angle of view (FOV) can be increased.

Further, the diameter of the optical filter (OF) is formed to be equal to or smaller than the diameter of the first output portion (112), contributing to the miniaturization of the optical system (100), and the angle of view (FOV) can be increased.

The diaphragm ST can adjust the amount of light incident on the upper surface IMG. The position of the diaphragm ST is not limited in the first embodiment of the present invention but may be variously arranged between the lenses for adjusting the light quantity of the light incident on the upper surface IMG. The diaphragm ST may be disposed between the second lens 120 and the third lens 130 as shown in the first numerical example in the first embodiment of the present invention.

Then, when light is incident on the incident surface of the first lens 110 from the object OBJ side, the light passes through the exit surface of the first lens 110, the incident surface of the second lens 120, The exit surface of the third lens 130, the exit surface of the third lens 30, the entrance surface of the fourth lens 140, the exit surface of the fourth lens 140, the exit surface of the fifth lens 150 The exit surface of the fifth lens 150, the entrance surface of the sixth lens 160, the exit surface of the sixth lens, and the optical filter OF in this order, and is incident on the upper surface IMG.

Although not shown, the wide-angle imaging optical system 100 according to the first embodiment of the present invention further includes a prism (not shown) for guiding light transmitted from the object OBJ side to the incident surface of the first lens 110 can do. A prism (not shown) is disposed apart from the incident surface of the first lens 110. A horizontal plane of the prism (not shown) is disposed to face the incident surface of the first lens 110, and a vertical plane of the prism (not shown) is disposed to face the object OBJ.

Then, when light is incident on the vertical surface of the prism (not shown) from the object OBJ side, the light is reflected through the inclined surface of the prism P and is bent, then passes through the horizontal surface of the prism (not shown) 110).

Accordingly, the arrangement direction of the lenses in the lens module according to the first embodiment of the present invention can be changed not in the thickness direction of the camera but in the longitudinal direction of the camera or in the width direction of the camera, have.

The wide-angle imaging optical system 100 according to the first embodiment of the present invention has the following design conditions.

In the first embodiment of the present invention, a relational expression according to the conditional expression (1) is established.

(1) F / (Ri - 0.5) ㅣ <F / Ri ㅣ <

Here, Ri represents the radius of curvature of the imaging element upper surface IMG, and F represents the focal length of the entire optical system 100. [

In the first embodiment of the present invention, the relational expression according to the conditional expression (2) is established.

0 < 2y / Ri < 0.5 ... Conditional expression (2)

Here, 2y represents the diagonal overall size of the imaging device or the image size of the optical system, and Ri represents the refractive index of the imaging device.

In the first embodiment of the present invention, a relational expression according to the conditional expression (3) is established.

3.5 <ㅣ F1 / F ㅣ <4.5 ... Conditional expression (3)

Here, F1 represents the focal length of the first lens 110, and F represents the focal length of the entire optical system 100. [

In the first embodiment of the present invention, a relational expression according to the conditional expression (4) is established.

5.0 <? 1 / R? 2 <7.0 ... Conditional expression (4)

Here, R1 is the radius of curvature of the first incident portion 111 of the first lens 110 and R2 is the radius of curvature of the first exit portion 112 of the first lens 110. [

In the first embodiment of the present invention, the relational expression according to the conditional expression (5) is established.

120 degrees < FOV < 170 degrees ... Conditional expression (5)

Here, FOV represents a field of view (FOV).

The wide-angle imaging optical system 100 according to the first embodiment of the present invention includes the first lens 110 arranged in order from the object OBJ side to the upper face IMG side, The lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 are arranged so as to have the shape and refractive power described above , A compact and lightweight, and a wide angle image of 100 degrees or more, and can capture a wider range of subjects, provide distorted aberration corrected images, and provide high resolution images. In addition, through the use of six lens modules, it is possible to realize high-performance performance required by the user, and to satisfy optical characteristics and aberration characteristics.

However, in the case of deviating from the above-mentioned design conditions, it is difficult to obtain a wide-angle image having a large angle of view of 100 degrees or more, a photographing range of a subject can not be specified, correction of distortion aberration is difficult, and it is difficult to provide a bright image of high resolution.

The wide-angle imaging optical system 100 according to the first embodiment of the present invention can be implemented through the first numerical embodiment.

Lens face Cotton Properties Radius of curvature thickness nd vd OBJ Sphere Infinity Infinity P Sphere Infinity 0.000000 111 Sphere 16.830 1.200 7725 49 112 Sphere 2.884 3.333 121 Asphere 5.509 0.639 651 21 122 Asphere -16.419 0.623 ST Sphere Infinity 0.025 131 Asphere 3.927 0.599 544 56 132 Asphere -1.242 0.025 141 Asphere -7.371 0.300 651 21 144 Asphere 2.017 0.273 151 Asphere -3.127 0.831 535 56 152 Asphere -0.758 0.025 161 Asphere 0.973 0.320 651 21 164 Asphere 0.620 0.321 OF1 Sphere Infinity 0.210 1.5167 64.2 OF2 Sphere Infinity 0.422 IMG Sphere Infinity 0.015

Table 1 shows design data of the first numerical example. In the first numerical example shown in [Table 1], the lens surface represents the sign of the lens surface shown in Fig. 1, the surface property represents the spherical state or the aspheric state of the lens surface, and the radius of curvature is the Represents the radius of curvature measured as a reference. Also, nd represents refractive index, and vd represents Abbe number. Further, OBJ denotes an object, P denotes a prism, ST denotes a diaphragm, and IMG denotes an upper surface.

The detailed numerical values in the first numerical example are as follows.

F number = 1.9,

F (focal length of the entire optical system) = 1.089 mm,

TL (optical system total field) = 9.160 mm,

2y (optical system image size (Sensor diagonal size)) = 4.540 mm,

F1 (focal length of the first lens) = -4.659,

F2 (focal length of the second lens) = 6.342,

F3 (focal length of the third lens) = 1.800,

F4 (focal length of the fourth lens) = -2.376,

F5 (focal length of the fifth lens) = 1.658,

F6 (focal length of the sixth lens) = -4.045.

Accordingly, F1 / F = -4.278,

R1 / R2 = 5.386,

Since FOV = 160, the above-described design conditions are satisfied.

F2 / F = 5.824.

The definition of the aspheric surface used in the wide-angle imaging optical system 100 according to the first embodiment of the present invention is as follows.

The aspherical shape can be expressed by the following equation, where the direction of the optical axis (OA) is the x axis, and the direction perpendicular to the optical axis (OA) is the y axis. Here, Z is the distance from the vertex of the lens to the optical axis OA, R is the distance in the direction perpendicular to the optical axis OA, C is the reciprocal of the radius of curvature at the apex of the lens, ) Constant, and a4, a6, a8, a10, a12, a14, ... are respectively aspheric coefficients.

In the first embodiment of the present invention,

이면,

If so,

The relationship is established.

Here, the aspherical surface coefficients in the first numerical example are as shown in [Table 2].

Aspherical coefficient Kornic constant
(K) Fourth order coefficient
(A) Sixth order coefficient
(B) 8th order coefficient
(C) 10th order coefficient
(D) 12th order coefficient
(E) 14th order coefficient
(F) 4 14.530496 0.072693 -0.076660 0.112495 -0.098771 0.050139 -0.010821 5 -90.000000 0.130345 -0.121550 0.208377 -0.178447 0.095607 -0.025709 7 0.000000 0.062637 -0.519742 2.091256 -10.071388 26.410004 -55.810749 8 -0.181337 -0.414760 2.097714 -10.047074 23.324090 -30.524676 12.661088 9 90.000000 -1.009471 3.246259 -15.911623 44.909738 -71.014262 49.837362 10 -4.743454 -0.507422 1.157590 -2.836715 4.341448 -3.732382 1.443713 11 -99.000000 -0.176552 0.519806 -0.218381 -0.588944 0.800497 -0.318829 12 -0.754766 0.020193 0.631685 -1.529030 2.095621 -1.234147 0.256287 13 -9.394739 0.000908 -0.638641 0.913542 -0.643020 0.225961 -0.031077 14 -3.181534 -0.272561 0.115290 -0.020613 -0.003572 0.001957 -0.000229

In the wide-angle imaging optical system according to the first numerical example, longitudinal spherical aberration, astigmatic field curves, and distortion are shown in FIG. Here, the curvature of the surface may show a tangential field curvature (T) and a sagittal field curvature (S).

3 and 4, the wide-angle imaging optical system 200 according to the second embodiment of the present invention may include a lens module arranged from the object OBJ side to the image plane IMG side. Here, the lens module includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250 and a sixth lens 260, . &Lt; / RTI &gt; Further, the lens module may further include an optical filter (OF), and may further include a diaphragm (ST).

In the second embodiment of the present invention, the upper surface IMG is formed in a planar shape. In other words, the upper surface IMG of the image pickup device is made up of a plane perpendicular to the optical axis OA.

In the second embodiment of the present invention, the object OBJ may be spherical or aspherical.

The first lens 210 has a convex meniscus shape on the object OBJ side. On the incident surface of the first lens 210, a convex first incident portion 211 is formed with reference to the object OBJ side. A concave first emitting portion 212 is formed on the emitting surface of the first lens 210 with reference to the upper surface IMG. The first supporting part 213 extending from the first boundary 214 indicating the edge of the first emitting part 212 is formed on the emitting surface of the first lens 210 so that the first incidence part 211 It is possible to prevent the leakage of the light incident thereon. The first support portion 213 may have a planar shape corresponding to a plane perpendicular to the optical axis OA.

At this time, the radius of curvature of the first incident portion 211 is formed to be larger than the radius of curvature of the first emitting portion 212 with respect to the upper surface IMG, so that it can serve as a concave lens. Accordingly, the first lens 210 has a negative refractive power.

Both the first incident portion 211 and the first emitting portion 212 may be spherical.

The diameter of the first incidence part 211 is larger than the diameter of the first incidence part 212 so that all the light incident on the first incidence part 211 is emitted through the first output part 212, Contributing to the downsizing of the display device 200 and increasing the angle of view FOV.

The second lens 220 has a positive refractive power. The second lens 220 has a convex meniscus shape on the object OBJ side. On the incident surface of the second lens 220, a convex second incident portion 221 is formed with reference to the object OBJ side. A convex second output portion 222 is formed on the exit surface of the second lens 220 with reference to the upper surface IMG. The second supporting portion 223 extending from the second boundary 224 indicating the edge of the second emitting portion 222 is formed on the emitting surface of the second lens 220 so that the second incident portion 221 It is possible to prevent the leakage of the light incident thereon. The second support portion 223 may have a planar shape corresponding to a plane perpendicular to the optical axis OA.

At this time, the radius of curvature of the second incident portion 221 is positive and the radius of curvature of the second light exiting portion 222 is negative with respect to the upper surface IMG, and can serve as a convex lens. The second light output unit 222 may be formed to be parallel to a plane perpendicular to the optical axis OA or concave with respect to the image plane IMG to serve as a convex lens.

Both the second light incidence part 221 and the second light output part 222 may be aspherical.

The diameter of the second lens 220 is smaller than the diameter of the first lens 210 so that light transmitted through the first exit 212 is incident on the second incidence 221, Contributing to downsizing of the display device, and increasing the angle of view (FOV). Particularly, the diameter of the second lens 220 is smaller than the diameter of the first exit part 212 so that light transmitted through the first exit part 212 is incident on the second incident part 221, Contributes to miniaturization of the optical system 200, and the angle of view (FOV) can be increased.

The diameter of the second incident portion 221 is larger than the diameter of the second exit portion 222 so that all the light incident on the second incident portion 221 is emitted through the second exit portion 222, Contributing to the downsizing of the display device 200 and increasing the angle of view FOV.

The third lens 230 has a shape in which both an incident surface and an exit surface are convex. On the incident surface of the third lens 230, a convex third incident portion 231 is formed with reference to the object OBJ side. A diaphragm seating part for seating the diaphragm ST may be formed on the incident surface of the third lens 230. The diaphragm seating part may extend from the edge of the third incident portion 231. [ The third exit part 232 is formed on the exit surface of the second lens 220 so as to be convex with respect to the upper surface IMG.

At this time, the radius of curvature of the third incident portion 231 is positive and the radius of curvature of the third emitting portion 232 is negative with respect to the image plane IMG, thereby performing a convex lens function. The second emitting portion 222 may be substantially flat or may have a concave shape with respect to the upper surface IMG side to serve as a convex lens. Accordingly, the third lens 230 has a positive refractive power.

Both the third incident portion 231 and the third incident portion 232 may be aspherical.

The diameter of the third lens 230 is smaller than the diameter of the second lens 220 so that the light transmitted through the second output portion 222 is incident on the third incident portion 231, Contributing to downsizing of the display device, and increasing the angle of view (FOV). Particularly, the diameter of the third lens 230 is smaller than the diameter of the second exit part 222, so that light transmitted through the second exit part 222 is incident on the third incident part 231, Contributes to miniaturization of the optical system 200, and the angle of view (FOV) can be increased.

The diameter of the third incident portion 231 is formed to be equal to or smaller than the diameter of the third exit portion 232 so that all the light incident on the third incident portion 231 is emitted through the third exit portion 232 Contributing to the miniaturization of the optical system 200, and increasing the angle of view (FOV).

The fourth lens 240 has a shape in which both an incident surface and an exit surface are concave. On the incident surface of the fourth lens 240, a fourth incident portion 241 concaved with reference to the object OBJ side is formed. The third supporting portion 242 extending from the third boundary 243 that indicates the edge of the fourth incident portion 241 is formed on the incident surface of the fourth lens 240 so that the fourth incident portion 241 It is possible to prevent the leakage of the light incident thereon. The third support portion 242 may have a downward inclination toward the edge of the fourth lens 240 or a planar shape corresponding to a plane perpendicular to the optical axis OA. A fourth emitting portion 244 recessed with reference to the upper surface IMG side is formed on the emitting surface of the fourth lens 240. A lens projection 245 is protruded from the exit surface of the fourth lens 240. The lens protruding portion 245 is formed with a protruding surface which is inclined upward from the edge of the fourth emitting portion 244 toward the edge of the fourth lens 240 and toward the upper surface IMG.

At this time, the radius of curvature of the third incident portion 231 is negative and the radius of curvature of the third emitting portion 232 is a positive number to serve as a concave lens, based on the upper surface IMG. Accordingly, the fourth lens 240 has a negative refractive power.

The fourth incident portion 241 and the fourth incident portion 244 may all be aspherical.

The diameter of the fourth lens 240 is larger than the diameter of the third lens 230 so that light transmitted through the third exit part 232 is incident on the fourth incident part 241, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the fourth incident portion 241 is formed smaller than the diameter of the fourth exit portion 244 by the third support portion 242 so that all the light incident on the fourth incident portion 241 passes through the fourth exit portion 244 , Contributing to downsizing of the optical system 200, and increasing the angle of view (FOV).

The fifth lens 250 has a positive refractive power. The fifth lens 250 has a convex meniscus shape on the upper surface IMG side. On the incident surface of the fifth lens 250, a fifth incident portion 251 concaved with reference to the object OBJ side is formed. The fifth lens 250 may have a protruding support portion on which the lens protrusion 245 is supported. The projecting support portion can be engaged with the lens projection portion 245. A fifth exit 252 convex on the upper surface IMG side is formed on the exit surface of the fifth lens 250. The curved exit portion may be formed on the exit surface of the fifth lens 250, the curved exit portion extending from the edge of the fifth exit 252 and changing the radius of curvature through the inflection point. The inflection point may indicate a point where the sign of the radius of curvature changes from (+) to (-) or changes from (-) to (+). The inflection point may indicate a point where the shape of the lens changes from convex to concave or from concave to convex. The exit surface of the fifth lens 250 has a convex shape near the optical axis OA with respect to the upper surface IMG and has a concave shape as it goes from the optical axis OA to the edge of the fifth lens 250 have.

At this time, the radius of curvature of the fifth incident portion 251 and the radius of curvature of the fifth emitting portion 252 are negative with respect to the upper surface IMG, and the radius of curvature of the fifth incident portion 251, Is formed to be smaller than the radius of curvature of the convex lens 252 and can function as a convex lens. In other words, the radius of curvature of the fifth incident portion 251 is greater than the radius of curvature of the fifth exit portion 252 with respect to the object OBJ side, and can serve as a convex lens.

The fifth incident portion 251 and the fifth incident portion 252 may be aspherical.

The diameter of the fifth lens 250 is larger than the diameter of the fourth lens 240 so that light transmitted through the fourth exit 244 is incident on the fifth incident portion 251, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the fifth incident portion 251 is formed to be substantially equal to the diameter of the fifth exit portion 252 so that all the light incident on the fifth incident portion 251 is emitted through the fifth exit portion 252 Contributing to the miniaturization of the optical system 200, and increasing the angle of view (FOV).

The sixth lens 260 has a negative refractive power. On the incident surface of the sixth lens 260, a sixth incident portion 261 convex on the object OBJ side is formed. The fourth supporting portion 262 extending from the fourth boundary 263 indicating the edge of the sixth incident portion 261 is formed on the incident surface of the sixth lens 260 so that the fifth emergent portion 252 Leakage of the light transmitted from the inflection and emission unit 253 can be prevented. The fourth support portion 262 may have a planar shape corresponding to a plane perpendicular to the optical axis OA. A sixth exit portion 264 concaved from the upper surface IMG side is formed on the exit surface of the sixth lens 260.

The incidence surface of the sixth lens 260 is formed with an incidence bent portion extending from the edge of the sixth incidence portion 261 and changing its curvature through at least one inflection point. Further, on the exit surface of the sixth lens 260, an exit curve portion extending from the edge of the sixth exit portion 264 and changing its curvature through at least one inflection point is formed. The inflection point may indicate a point where the sign of the radius of curvature changes from (+) to (-) or changes from (-) to (+). The inflection point may indicate a point where the shape of the lens changes from convex to concave or from concave to convex. The incident surface of the sixth lens 260 has a convex shape near the optical axis OA as a reference and may have a concave shape as it goes from the optical axis OA to the edge of the sixth lens 260. [ The exit surface of the sixth lens 260 has a concave shape near the optical axis OA with respect to the upper surface IMG and has a convex shape from the optical axis OA to the edge of the sixth lens 260 have. At this time, the thickness of the sixth lens 260 is gradually increased from the optical axis OA toward the edge of the sixth lens 260.

At this time, the radius of curvature of the sixth incident portion 261 and the radius of curvature of the sixth exit portion 264 are positive, and the radius of curvature of the sixth incident portion 261 is a positive value, Is formed to be larger than the radius of curvature of the concave lens 264 to serve as a concave lens. In other words, the thickness of the sixth lens 260 may be gradually increased from the optical axis OA toward the edge of the sixth lens 260 to serve as a concave lens.

Both the sixth incident portion 261 and the sixth exit portion 264 may be aspherical.

The diameter of the sixth lens 260 is larger than the diameter of the fifth lens 250 so that the light transmitted through the fifth emitting portion 252 and the inflection and emission portion 253 is incident on the sixth incident portion 261, So that it is possible to make the optical system 200 compact and to increase the angle of view (FOV). Particularly, the diameter of the entrance surface of the sixth lens 260 excluding the fourth support portion 262, or the diameter of the entrance surface of the sixth lens 260 including the sixth entrance portion 261 and the entrance curved portion, So that light transmitted through the fifth exit 252 and the curved exit 253 is incident on both the sixth incident portion 261 and the incidence bent portion of the optical system 200, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the sixth lens 260 including the sixth incidence portion 261 and the incidence bent portion is formed to be smaller than the diameter of the sixth lens 260 including the sixth output portion 264 and the exit curved portion, Both of the light incident on the light emitting portion 261 and the incident incidence portion are emitted through the sixth light output portion 264 and the outgoing light reflection portion so as to contribute to the miniaturization of the optical system 200 and to increase the angle of view FOV.

Further, the diameter of the sixth lens 260 is formed to be equal to or smaller than the diameter of the first exit 212, contributing to the miniaturization of the optical system 200, and increasing the angle of view (FOV).

The distance D11 between the first lens 210 and the second lens 220 in the wide-angle imaging optical system 200 according to the second embodiment of the present invention is formed larger than the distance between the other lenses, It is possible to stably satisfy the design conditions according to the second embodiment of the present invention.

The distance D11 between the first lens 210 and the second lens 220 is the greatest in the second embodiment of the present invention and the distance between the second lens 220 and the third lens 230 It is possible to stably collect light in a state in which the distance D12 is large and the angle of view is large and it is possible to stably satisfy the design conditions according to the second embodiment of the present invention.

The thickness of the first lens 210 may be equal to or greater than the distance D11 between the first lens 210 and the second lens 220. In this case, And the design conditions according to the second embodiment of the present invention can be stably satisfied.

At least one optical filter (OF) is disposed between the sixth lens (260) and the image surface (IMG). As the optical filter (OF), a low pass filter, an IR-cut filter, a cover glass, or the like can be used.

On the incident surface of the optical filter (OF), a filter incident portion (OF1) facing the sixth lens (260) on the object (OBJ) side is formed. A filter output portion OF2 facing the upper surface IMG on the upper surface IMG side is formed on the exit surface of the optical filter OF. The filter incident portion OF1 and the filter output portion OF2 may each have a planar shape substantially perpendicular to the optical axis OA. Accordingly, the optical filter OF can exhibit a flat plate shape.

The diameter of the optical filter OF is formed to be larger than the diameter of the sixth lens 260 so that the light transmitted through the sixth output portion 264 and the outgoing bent portion stably passes through the optical filter OF, 200), and the angle of view (FOV) can be increased.

Further, the diameter of the optical filter (OF) is formed to be equal to or smaller than the diameter of the first output portion (212), contributing to the miniaturization of the optical system (200) and increasing the angle of view (FOV).

The diaphragm ST can adjust the amount of light incident on the upper surface IMG. The position of the diaphragm ST is not limited in the second embodiment of the present invention but may be variously arranged between the lenses for adjusting the light amount of the light incident on the upper surface IMG. In the second embodiment of the present invention, as shown in the second numerical example, the diaphragm ST may be disposed between the second lens 220 and the third lens 230.

Then, when light is incident on the incident surface of the first lens 210 from the object OBJ side, the light passes through the exit surface of the first lens 210, the incident surface of the second lens 220, The exit surface of the third lens 230, the exit surface of the third lens 30, the entrance surface of the fourth lens 240, the exit surface of the fourth lens 240, the exit surface of the fifth lens 250 The exit surface of the fifth lens 250, the entrance surface of the sixth lens 260, the exit surface of the sixth lens, and the optical filter OF in this order, and is incident on the upper surface IMG.

Although not shown, the wide-angle imaging optical system 200 according to the second embodiment of the present invention further includes a prism (not shown) for guiding the light transmitted from the object OBJ to the incident surface of the first lens 210 can do. A prism (not shown) is disposed apart from the incident surface of the first lens 210. The horizontal plane of the prism (not shown) is disposed to face the incident surface of the first lens 210, and the vertical plane of the prism (not shown) is disposed to face the object OBJ.

Then, when light is incident on the vertical surface of the prism (not shown) from the object OBJ side, the light is reflected through the inclined surface of the prism P and is bent, then passes through the horizontal surface of the prism (not shown) 210).

Accordingly, the arrangement direction of the lenses in the lens module according to the second embodiment of the present invention can be changed not in the thickness direction of the camera but in the longitudinal direction of the camera or in the width direction of the camera, have.

The wide-angle imaging optical system 200 according to the second embodiment of the present invention has the following design conditions.

In the second embodiment of the present invention, a relational expression according to the conditional expression (1) is established.

(1) F / (Ri - 0.5) ㅣ <F / Ri ㅣ <

Here, Ri represents the radius of curvature of the imaging element upper surface IMG, and F represents the focal length of the entire optical system 200. [

In the second embodiment of the present invention, the relational expression according to the conditional expression (2) is established.

0 < 2y / Ri < 0.5 ... Conditional expression (2)

Here, 2y represents the diagonal overall size of the imaging device or the image size of the optical system, and Ri represents the refractive index of the imaging device.

In the second embodiment of the present invention, a relational expression according to the conditional expression (3) is established.

3.5 <ㅣ F1 / F ㅣ <4.5 ... Conditional expression (3)

Here, F1 represents the focal length of the first lens 210, and F represents the focal length of the entire optical system 200. [

In the second embodiment of the present invention, a relational expression according to the conditional expression (4) is established.

5.0 <? 1 / R? 2 <7.0 ... Conditional expression (4)

Here, R1 is the radius of curvature of the first incident portion 211 of the first lens 210, and R2 is the radius of curvature of the first emitting portion 212 of the first lens 210. [

In the second embodiment of the present invention, the relational expression according to the conditional expression (5) is established.

120 degrees < FOV < 170 degrees ... Conditional expression (5)

Here, FOV represents a field of view (FOV).

The wide-angle imaging optical system 200 according to the second embodiment of the present invention has the first lens 210 arranged in order from the object OBJ side to the upper face IMG side, The lens 220, the third lens 230, the fourth lens 240, the fifth lens 250, and the sixth lens 260 are designed so as to have the above-described shape and refractive power , A compact and lightweight, and a wide angle image of 100 degrees or more, and can capture a wider range of subjects, provide distorted aberration corrected images, and provide high resolution images. In addition, through the use of six lens modules, it is possible to realize high-performance performance required by the user, and to satisfy optical characteristics and aberration characteristics.

However, in the case of deviating from the above-mentioned design conditions, it is difficult to obtain a wide-angle image having a large angle of view of 100 degrees or more, a photographing range of a subject can not be specified, correction of distortion aberration is difficult, and it is difficult to provide a bright image of high resolution.

The wide-angle imaging optical system 200 according to the second embodiment of the present invention can be implemented through the second numerical embodiment.

Lens face Cotton Properties Radius of curvature thickness nd vd OBJ Sphere Infinity Infinity P Sphere Infinity 0.000000 111 Sphere 17.435 1.372 7725 49 112 Sphere 2.789 3.142 121 Asphere 5.693 0.672 651 21 122 Asphere -11.343 0.548 ST Sphere Infinity 0.047 131 Asphere 4.301 0.615 544 56 132 Asphere -1.232 0.025 141 Asphere -7,000 0.300 651 21 144 Asphere 1.985 0.246 151 Asphere -3.299 0.832 535 56 152 Asphere -0.756 0.025 161 Asphere 0.976 0.320 651 21 164 Asphere 0.636 0.315 OF1 Sphere Infinity 0.210 1.5167 64.2 OF2 Sphere Infinity 0.422 IMG Sphere Infinity 0.015

Table 3 shows design data of the second numerical example. In the second numerical embodiment shown in [Table 3], the lens surface represents the sign of the lens surface shown in Fig. 3, the surface attribute represents the spherical state or the aspheric state of the lens surface, and the radius of curvature is the Represents the radius of curvature measured as a reference. Also, nd represents refractive index, and vd represents Abbe number. Further, OBJ denotes an object, P denotes a prism, ST denotes a diaphragm, and IMG denotes an upper surface.

In the second numerical example, the detailed values are as follows.

F number = 1.9,

F (focal length of the entire optical system) = 1.067 mm,

TL (optical system total field) = 9.100 mm,

2y (optical system image size (Sensor diagonal size)) = 4.540 mm,

F1 (focal length of the first lens) = -4.459,

F2 (focal length of the second lens) = 5.852,

F3 (focal length of the third lens) = 1.824,

F4 (focal length of the fourth lens) = -2.319,

F5 (focal length of the fifth lens) = 1.637,

F6 (focal length of the sixth lens) = -4.436.

Accordingly, F1 / F = -4.179,

R1 / R2 = 6.252,

Since FOV = 160, the above-described design conditions are satisfied.

F2 / F = 5.485.

Definition of an aspherical surface used in the wide-angle imaging optical system 200 according to the second embodiment of the present invention is as follows.

The aspherical shape can be expressed by the following equation, where the direction of the optical axis (OA) is the x axis, and the direction perpendicular to the optical axis (OA) is the y axis. Here, Z is the distance from the vertex of the lens to the optical axis OA, R is the distance in the direction perpendicular to the optical axis OA, C is the reciprocal of the radius of curvature at the apex of the lens, ) Constant, and a4, a6, a8, a10, a12, a14, ... are respectively aspheric coefficients.

In the second embodiment of the present invention,

이면,

If so,

The relationship is established.

Here, the aspherical surface coefficients of the second numerical example are as shown in [Table 4].

Aspherical coefficient Kornic constant
(K) Fourth order coefficient
(A) Sixth order coefficient
(B) 8th order coefficient
(C) 10th order coefficient
(D) 12th order coefficient
(E) 14th order coefficient
(F) 4 15.541079 0.072693 -0.076660 0.112495 -0.098771 0.050139 -0.010821 5 -90.000000 0.130345 -0.121550 0.208377 -0.178447 0.095607 -0.025709 7 0.000000 0.081067 -0.313795 -0.577971 6.050281 -16.383008 -18.841465 8 -0.130319 -0.507102 2.612382 -10.465494 20.561765 -24.251209 8.959989 9 90.000000 -1.132476 3.429870 -15.229724 42.136010 -69.980978 53.426422 10 -5.038617 -0.517069 1.057913 -2.350612 3.370400 -2.819219 1.133967 11 -99.000000 -0.088060 0.439433 -0.295313 -0.328342 0.566782 -0.237988 12 -0.766465 0.017967 0.628718 -1.465829 2.044086 -1.229415 0.259602 13 -9.394739 0.035111 -0.804968 1.265554 -0.987587 0.377091 -0.055440 14 -2.904654 -0.366329 0.256934 -0.116650 0.029228 -0.003571 0.000130

In the wide-angle imaging optical system according to the second numerical embodiment, longitudinal spherical aberration, astigmatic field curves, and distortion are shown in FIG. Here, the curvature of the surface may show a tangential field curvature (T) and a sagittal field curvature (S).

5 and 6, the wide-angle imaging optical system 300 according to the third embodiment of the present invention may include a lens module arranged from the object OBJ side to the image plane IMG side. Here, the lens module includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350 and a sixth lens 360, . &Lt; / RTI &gt; Further, the lens module may further include an optical filter (OF), and may further include a diaphragm (ST).

In the third embodiment of the present invention, the upper surface IMG is formed in a planar shape. In other words, the upper surface IMG of the image pickup device is made up of a plane perpendicular to the optical axis OA.

In the third embodiment of the present invention, the object OBJ may be spherical or aspherical.

The first lens 310 has a convex meniscus shape toward the object OBJ side. On the incident surface of the first lens 310, a convex first incident portion 311 is formed with reference to the object OBJ side. A first light output portion 312 having a concave surface with reference to the upper surface IMG side is formed on the exit surface of the first lens 310. The first supporting portion 313 extending from the first boundary 314 indicating the edge of the first emitting portion 312 is formed on the emitting surface of the first lens 310 so that the first incident portion 311 It is possible to prevent the leakage of the light incident thereon. The first support portion 313 may have a planar shape corresponding to a plane perpendicular to the optical axis OA.

At this time, the radius of curvature of the first incident portion 311 is larger than the radius of curvature of the first emitting portion 312 with respect to the upper surface IMG, so that it can serve as a concave lens. Accordingly, the first lens 310 has a negative refractive power.

Both the first incident portion 311 and the first emitting portion 312 may be spherical.

The diameter of the first incident portion 311 is formed to be larger than the diameter of the first exit portion 312 so that all the light incident on the first incident portion 311 is emitted through the first exit portion 312, Contributes to miniaturization of the display device 300, and the angle of view (FOV) can be increased.

The second lens 320 has a positive refractive power. The second lens 320 has a convex meniscus shape on the object OBJ side. On the incident surface of the second lens 320, a convex second incident portion 321 is formed with reference to the object OBJ side. A convex second output portion 322 is formed on the exit surface of the second lens 320 with reference to the upper surface IMG. The second supporting portion 323 extending from the second boundary 324 indicating the edge of the second emitting portion 322 is formed on the emission surface of the second lens 320 so that the second incident portion 321 It is possible to prevent the leakage of the light incident thereon. The second support portion 323 may have a planar shape corresponding to a plane perpendicular to the optical axis OA.

At this time, the radius of curvature of the second incident portion 321 is positive and the radius of curvature of the second emitting portion 322 is negative with respect to the image plane IMG, and thus can serve as a convex lens. The second light output portion 322 may be formed to be parallel to a plane perpendicular to the optical axis OA or concave with respect to the upper surface IMG, so as to function as a convex lens.

Both the second incident portion 321 and the second incident portion 322 may be aspherical.

The diameter of the second lens 320 is smaller than the diameter of the first lens 310 so that the light transmitted through the first output portion 312 is incident on the second incident portion 321, Contributing to downsizing of the display device, and increasing the angle of view (FOV). Particularly, the diameter of the second lens 320 is smaller than the diameter of the first exit part 312 so that light transmitted through the first exit part 312 is incident on the second incident part 321, Contributes to miniaturization of the optical system 300, and the angle of view (FOV) can be increased.

The diameter of the second incident portion 321 is formed to be larger than the diameter of the second exit portion 322 so that all the light incident on the second incident portion 321 is emitted through the second exit portion 322, Contributes to miniaturization of the display device 300, and the angle of view (FOV) can be increased.

The third lens 330 has a shape in which both an incident surface and an exit surface are convex. On the incident surface of the third lens 330, a convex third incident portion 331 is formed with reference to the object OBJ side. A diaphragm seating part for seating the diaphragm ST may be formed on the incident surface of the third lens 330. [ The diaphragm seating portion may extend from the edge of the third incident portion 331. A convex third output portion 332 is formed on the exit surface of the second lens 320 with reference to the upper surface IMG.

At this time, the radius of curvature of the third incident portion 331 is positive and the radius of curvature of the third emitting portion 332 is negative with respect to the upper surface IMG, and can serve as a convex lens. The second emitting portion 322 may be substantially flat or may have a concave shape with respect to the upper surface (IMG) side to serve as a convex lens. Accordingly, the third lens 330 has a positive refractive power.

The third incident portion 331 and the third incident portion 332 may all be aspherical.

The diameter of the third lens 330 is smaller than the diameter of the second lens 320 so that light transmitted through the second output portion 322 is incident on the third incident portion 331, Contributing to downsizing of the display device, and increasing the angle of view (FOV). Particularly, the diameter of the third lens 330 is smaller than the diameter of the second exit part 322, so that light transmitted through the second exit part 322 is incident on the third incident part 331, Contributes to miniaturization of the optical system 300, and the angle of view (FOV) can be increased.

The diameter of the third incident portion 331 is formed to be equal to or smaller than the diameter of the third exit portion 332 so that all the light incident on the third incident portion 331 is emitted through the third exit portion 332 Contributing to downsizing of the optical system 300, and increasing the angle of view (FOV).

The fourth lens 340 has a shape in which both an incident surface and an exit surface are concave. On the incident surface of the fourth lens 340, a fourth incident portion 341 concaved with reference to the object OBJ side is formed. The third supporting portion 342 extending from the third boundary 343 indicating the edge of the fourth incident portion 341 is formed on the incident surface of the fourth lens 340 so that the fourth incident portion 341 It is possible to prevent the leakage of the light incident thereon. The third support portion 342 may be inclined downward toward the edge of the fourth lens 340 or may have a planar shape corresponding to a plane perpendicular to the optical axis OA. A fourth emitting portion 344 recessed from the upper surface IMG side is formed on the emitting surface of the fourth lens 340. A lens projection 345 is protruded from the exit surface of the fourth lens 340. The lens protruding portion 345 is formed with a protruding surface which is inclined upward from the edge of the fourth emitting portion 344 toward the edge of the fourth lens 340 and the side of the upper surface IMG.

At this time, the radius of curvature of the third incident portion 331 is negative and the radius of curvature of the third emitting portion 332 is positive, serving as a negative lens, based on the upper surface IMG. Accordingly, the fourth lens 340 has a negative refractive power.

Both the fourth incident portion 341 and the fourth incident portion 344 may be aspherical.

The diameter of the fourth lens 340 is larger than the diameter of the third lens 330 so that light transmitted through the third exit 332 is incident on the fourth incidence 341, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the fourth incident portion 341 is smaller than the diameter of the fourth exit portion 344 by the third support portion 342 so that all the light incident on the fourth incident portion 341 is reflected by the fourth exit portion 344 So that it contributes to downsizing of the optical system 300, and the angle of view (FOV) can be increased.

The fifth lens 350 has a positive refractive power. The fifth lens 350 has a convex meniscus shape on the upper surface IMG side. On the incident surface of the fifth lens 350, a fifth incident portion 351 concaved with reference to the object OBJ side is formed. The fifth lens 350 may have a protruding support portion for supporting the lens protrusion 345 on the incident surface thereof. The projecting support portion can be engaged with the lens projection portion 345. [ A fifth exit portion 352 convex on the upper surface IMG side is formed on the exit surface of the fifth lens 350. The fifth lens 350 may have a curved exit portion extending from the edge of the fifth exit portion 352 and having a radius of curvature changed through an inflection point. The inflection point may indicate a point where the sign of the radius of curvature changes from (+) to (-) or changes from (-) to (+). The inflection point may indicate a point where the shape of the lens changes from convex to concave or from concave to convex. The exit surface of the fifth lens 350 has a convex shape near the optical axis OA with respect to the upper surface IMG and has a concave shape as it goes from the optical axis OA to the edge of the fifth lens 350 have.

At this time, the radius of curvature of the fifth incident portion 351 and the radius of curvature of the fifth exit portion 352 are negative, and the radius of curvature of the fifth incident portion 351 is a radius of curvature of the fifth exit portion 352, Is formed to be smaller than the radius of curvature of the concave portion 352 and can function as a convex lens. In other words, the radius of curvature of the fifth incident portion 351 is formed to be larger than the radius of curvature of the fifth exit portion 352 with respect to the object OBJ side to serve as a convex lens.

The fifth incident portion 351 and the fifth incident portion 352 may all be aspherical.

The diameter of the fifth lens 350 is formed to be larger than the diameter of the fourth lens 340 so that light transmitted through the fourth emitting portion 344 is incident on the fifth incident portion 351, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the fifth incident portion 351 is formed to be substantially equal to the diameter of the fifth exit portion 352 so that all the light incident on the fifth incident portion 351 is emitted through the fifth exit portion 352 Contributing to the miniaturization of the optical system 300, and increasing the angle of view (FOV).

The sixth lens 360 has a negative refractive power. On the incident surface of the sixth lens 360, a sixth incident portion 361 convex on the object OBJ side is formed. The fourth supporting portion 362 extending from the fourth boundary 363 indicating the edge of the sixth incident portion 361 is formed on the incident surface of the sixth lens 360 so that the fifth emergent portion 352 It is possible to prevent leakage of light transmitted from the inflection and emission unit 353. The fourth support portion 362 is protruded toward the object OBJ side in correspondence with the surface perpendicular to the optical axis OA. The end of the fourth support portion 362 may be disposed between the entrance surface of the fourth lens 340 and the entrance surface of the third lens 330. [ In other words, the projection height of the fourth support portion 362 with respect to the image surface IMG is smaller than the distance from the image surface IMG to the incident surface of the third lens 330, The third lens 330, the fourth lens 340, and the fifth lens 350 are protected to prevent the light incident on the lens module from leaking to improve the sharpness of the photographed object Contributing. A sixth exit portion 364 recessed from the upper surface IMG side is formed on the exit surface of the sixth lens 360.

The incidence surface of the sixth lens 360 is formed with an incidence bent portion extending from the edge of the sixth incidence portion 361 and changing its curvature through at least one inflection point. Further, on the exit surface of the sixth lens 360, an exit curve portion extending from the edge of the sixth exit portion 364 and changing its curvature through at least one inflection point is formed. The inflection point may indicate a point where the sign of the radius of curvature changes from (+) to (-) or changes from (-) to (+). The inflection point may indicate a point where the shape of the lens changes from convex to concave or from concave to convex. The incident surface of the sixth lens 360 has a convex shape near the optical axis OA as a reference and may have a concave shape as it goes from the optical axis OA to the edge of the sixth lens 360. [ The exit surface of the sixth lens 360 has a concave shape near the optical axis OA with respect to the upper surface IMG and has a convex shape from the optical axis OA to the edge of the sixth lens 360 have. At this time, the thickness of the sixth lens 360 gradually increases from the optical axis OA toward the edge of the sixth lens 360.

At this time, the radius of curvature of the sixth incident portion 361 and the radius of curvature of the sixth exit portion 364 are positive, and the radius of curvature of the sixth incident portion 361 is a positive value, Is formed to be larger than the radius of curvature of the concave lens 364 to serve as a concave lens. In other words, the thickness of the sixth lens 360 may be gradually increased from the optical axis OA toward the edge of the sixth lens 360 to serve as a concave lens.

The sixth incidence portion 361 and the sixth incidence portion 364 may be aspherical.

The diameter of the sixth lens 360 is larger than the diameter of the fifth lens 350 so that light transmitted through the fifth emitting portion 352 and the inflection and emission portion 353 is incident on the sixth incident portion 361, It is possible to cause the optical system 300 to be miniaturized and to increase the angle of view (FOV). Particularly, the diameter of the incidence surface of the sixth lens 360 excluding the fourth support portion 362 or the diameter of the incidence surface of the sixth lens 360, including the sixth incidence portion 361 and the incidence incision portion, So that the light transmitted through the fifth exit part 352 and the curved exit part 353 is incident on both the sixth incident part 361 and the incidence curved part of the optical system 300, Contributing to downsizing of the display device, and increasing the angle of view (FOV).

The diameter of the sixth lens 360 including the sixth incidence portion 361 and the incidence bent portion is formed to be smaller than the diameter of the sixth lens 360 including the sixth exit portion 364 and the exit curved portion, It is possible to cause both of the light 361 and the incident incidence portion to emit light through the sixth light output portion 364 and the outgoing light reflection portion to contribute to the miniaturization of the optical system 300 and to increase the angle of view FOV.

The diameter of the sixth lens 360 is formed to be equal to or smaller than the diameter of the first exit 312, contributing to the miniaturization of the optical system 300 and enabling a larger angle of view (FOV).

The distance D11 between the first lens 310 and the second lens 320 in the wide-angle imaging optical system 300 according to the third embodiment of the present invention is larger than the distance between the other lenses, It is possible to stably satisfy the design conditions according to the third embodiment of the present invention.

In the third embodiment of the present invention, the distance D11 between the first lens 310 and the second lens 320 is the largest, and the distance between the second lens 320 and the third lens 330 It is possible to stably collect light in a state in which the distance D12 is large and the angle of view is large and it is possible to stably satisfy the design conditions according to the third embodiment of the present invention.

In the third embodiment of the present invention, the thickness of the first lens 310 is equal to or greater than the distance D11 between the first lens 310 and the second lens 320, And can stably satisfy the design conditions according to the third embodiment of the present invention.

The optical filter OF is disposed at least one between the sixth lens 360 and the upper surface IMG. As the optical filter (OF), a low pass filter, an IR-cut filter, a cover glass, or the like can be used.

On the incident surface of the optical filter (OF), a filter incident portion (OF1) facing the sixth lens (360) on the object (OBJ) side is formed. A filter output portion OF2 facing the upper surface IMG on the upper surface IMG side is formed on the exit surface of the optical filter OF. The filter incident portion OF1 and the filter output portion OF2 may each have a planar shape substantially perpendicular to the optical axis OA. Accordingly, the optical filter OF can exhibit a flat plate shape.

The diameter of the optical filter OF is formed to be larger than the diameter of the sixth lens 360 so that the light transmitted through the sixth output portion 364 and the outgoing bent portion stably passes through the optical filter OF, 300), and the angle of view (FOV) can be increased.

The diameter of the optical filter (OF) is formed to be equal to or smaller than the diameter of the first output portion (312), contributing to the miniaturization of the optical system (300), and the angle of view (FOV) can be increased.

The diaphragm ST can adjust the amount of light incident on the upper surface IMG. The position of the diaphragm ST is not limited in the third embodiment of the present invention but may be variously arranged between the lenses for adjusting the light amount of the light incident on the upper surface IMG. The diaphragm ST may be disposed between the second lens 320 and the third lens 330 as shown in the third numerical example in the third embodiment of the present invention.

Then, when light is incident on the incident surface of the first lens 310 from the object OBJ side, the light passes through the exit surface of the first lens 310, the incident surface of the second lens 320, The entrance surface of the third lens 330, the exit surface of the third lens 30, the entrance surface of the fourth lens 340, the exit surface of the fourth lens 340, the exit surface of the fifth lens 350 The exit surface of the fifth lens 350, the entrance surface of the sixth lens 360, the exit surface of the sixth lens, and the optical filter OF in this order, and is incident on the upper surface IMG.

Although not shown, the wide-angle imaging optical system 300 according to the third embodiment of the present invention further includes a prism (not shown) for guiding the light transmitted from the object OBJ to the incident surface of the first lens 310 can do. A prism (not shown) is disposed apart from the incident surface of the first lens 310. A horizontal plane of the prism (not shown) is disposed to face the incident surface of the first lens 310, and a vertical plane of the prism (not shown) is disposed to face the object OBJ.

Then, when light is incident on the vertical surface of the prism (not shown) from the object OBJ side, the light is reflected through the inclined surface of the prism P and is bent, then passes through the horizontal surface of the prism (not shown) 310).

Accordingly, the arrangement direction of the lenses in the lens module according to the third embodiment of the present invention can be changed not in the thickness direction of the camera but in the longitudinal direction of the camera or in the width direction of the camera, have.

The wide-angle imaging optical system 300 according to the third embodiment of the present invention has the following design conditions.

In the third embodiment of the present invention, the relational expression according to the conditional expression (1) is established.

(1) F / (Ri - 0.5) ㅣ <F / Ri ㅣ <

Here, Ri represents the radius of curvature of the imaging element upper surface IMG, and F represents the focal length of the entire optical system 300. [

In the third embodiment of the present invention, the relational expression according to the conditional expression (2) is established.

0 < 2y / Ri < 0.5 ... Conditional expression (2)

Here, 2y represents the diagonal overall size of the imaging device or the image size of the optical system, and Ri represents the refractive index of the imaging device.

In the third embodiment of the present invention, a relational expression according to the conditional expression (3) is established.

3.5 <ㅣ F1 / F ㅣ <4.5 ... Conditional expression (3)

Here, F1 represents the focal length of the first lens 310, and F represents the focal length of the entire optical system 300. [

In the third embodiment of the present invention, a relational expression according to the conditional expression (4) is established.

5.0 <? 1 / R? 2 <7.0 ... Conditional expression (4)

Here, R1 is the radius of curvature of the first incident portion 311 of the first lens 310, and R2 is the radius of curvature of the first emitting portion 312 of the first lens 310. [

In the third embodiment of the present invention, a relational expression according to the conditional expression (5) is established.

120 degrees < FOV < 170 degrees ... Conditional expression (5)

Here, FOV represents a field of view (FOV).

The wide-angle imaging optical system 300 according to the third embodiment of the present invention has the first lens 310 arranged in order from the object OBJ side to the upper face IMG side, The lens 320, the third lens 330, the fourth lens 340, the fifth lens 350 and the sixth lens 360 are designed so as to have the shape and refractive power described above , A compact and lightweight, wide-angle image with a view angle of 100 degrees or more, a wider range of subjects can be photographed, distorted aberration-corrected images can be provided, and high-resolution images can be provided. In addition, through the use of six lens modules, it is possible to realize high-performance performance required by the user, and to satisfy optical characteristics and aberration characteristics.

However, in the case of deviating from the above-mentioned design conditions, it is difficult to obtain a wide-angle image having a large angle of view of 100 degrees or more, a photographing range of a subject can not be specified, correction of distortion aberration is difficult, and it is difficult to provide a bright image of high resolution.

The wide-angle imaging optical system 300 according to the third embodiment of the present invention can be implemented through the third numerical example.

Lens face Cotton Properties Radius of curvature thickness nd vd OBJ Sphere Infinity Infinity P Sphere Infinity 0.000000 111 Sphere 16.200 1.032 7725 49 112 Sphere 2.920 3.248 121 Asphere 5.743 0.603 651 21 122 Asphere -10.991 0.510 ST Sphere Infinity 0.040 131 Asphere 13.050 0.598 544 56 132 Asphere -1.135 0.035 141 Asphere -7.957 0.360 651 21 144 Asphere 2.088 0.143 151 Asphere -4.741 1.125 535 56 152 Asphere -0.796 0.025 161 Asphere 1.206 0.354 651 21 164 Asphere 0.696 0.379 OF1 Sphere Infinity 0.210 1.5167 64.2 OF2 Sphere Infinity 0.427 IMG Sphere Infinity 0.012

Table 5 shows the design data of the third numerical example. In the third numerical embodiment shown in Table 5, the lens surface represents the sign of the lens surface shown in Fig. 5, the surface attribute represents the spherical state or the aspheric state of the lens surface, and the radius of curvature is the Represents the radius of curvature measured as a reference. Also, nd represents refractive index, and vd represents Abbe number. Further, OBJ denotes an object, P denotes a prism, ST denotes a diaphragm, and IMG denotes an upper surface.

The detailed numerical values in the third numerical example are as follows.

F number = 1.9,

F (focal length of the entire optical system) = 1.174 mm,

TL (optical system total field) = 9.100 mm,

2y (optical system image size (Sensor diagonal size)) = 4.540 mm,

F1 (focal length of the first lens) = -4.750,

F2 (focal length of the second lens) = 5.816,

F3 (focal length of the third lens) = 1.939,

F4 (focal length of the fourth lens) = -2.479,

F5 (focal length of the fifth lens) = 1.619,

F6 (focal length of the sixth lens) = -3.450.

Accordingly, F1 / F = -4.045,

R1 / R2 = 5.548,

Since FOV = 160, the above-described design conditions are satisfied.

F2 / F = 4.952.

The definition of an aspherical surface used in the wide-angle imaging optical system 300 according to the third embodiment of the present invention is as follows.

The aspherical shape can be expressed by the following equation, where the direction of the optical axis (OA) is the x axis, and the direction perpendicular to the optical axis (OA) is the y axis. Here, Z is the distance from the vertex of the lens to the optical axis OA, R is the distance in the direction perpendicular to the optical axis OA, C is the reciprocal of the radius of curvature at the apex of the lens, ) Constant, and a4, a6, a8, a10, a12, a14, ... are respectively aspheric coefficients.

In the third embodiment of the present invention,

이면,

If so,

The relationship is established.

Here, the aspherical surface coefficients in the third numerical example are as shown in [Table 6].

Aspherical coefficient Kornic constant
(K) Fourth order coefficient
(A) Sixth order coefficient
(B) 8th order coefficient
(C) 10th order coefficient
(D) 12th order coefficient
(E) 14th order coefficient
(F) 4 16.791433 0.062611 -0.078968 0.120834 -0.110422 0.058148 -0.012623 5 -90.000000 0.115285 -0.105971 0.139342 -0.070302 0.030345 -0.010173 7 0.000000 0.047094 -0.904793 4.523812 -20.164290 47.802409 -62.664659 8 -0.909960 -0.042126 -0.944164 2.861698 -7.118331 10.164742 -8.620061 9 90.000000 -0.424990 -0.136468 -0.583113 4.189888 -8.243288 6.424085 10 -0.710567 -0.272634 0.217203 -0.159362 0.180677 -0.213081 0.107675 11 -99.000000 0.084009 -0.061203 0.305963 -0.496964 0.336049 -0.082057 12 -0.752423 0.241829 -0.298378 0.395557 -0.359981 0.232493 -0.057236 13 -9.581947 0.106311 -0.629285 0.642003 -0.337734 0.093337 -0.010465 14 -2.520625 -0.226293 0.078756 -0.013543 0.000322 0.000256 -0.000034

In the wide-angle imaging optical system according to the third numerical example, longitudinal spherical aberration, astigmatic field curves, and distortion are shown in FIG. Here, the curvature of the surface may show a tangential field curvature (T) and a sagittal field curvature (S).

According to the above-described wide-angle imaging optical system, by using six lenses, it is possible to improve the sharpness of a photographed subject, to photograph a wider range of subjects, to provide an image in which distortion aberration is corrected, .

Further, the present invention can appropriately design the refractivity, the shape, the incident angle of the principal ray, the lens interval, etc. of the lens to provide a wide-angle image that is small and lightweight and has a view angle of 100 degrees or more

In addition, the lens module of the present invention is required to have a wide angle, high resolution, and high performance, and is capable of realizing high-performance performance required by a user through six lens modules and satisfying optical characteristics and aberration characteristics, Implementation is possible.

INDUSTRIAL APPLICABILITY The present invention can be used in a digital camera such as a camera or a digital camera, a surveillance camera, a computer camera, a mobile phone camera or the like that requires an optical system for virtual reality, motion recognition, image formation in the infrared region,

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modify or modify the Software.

OBJ: Object OA: Optical axis IMG: Image plane
OF: optical filter OF1: filter incident part OF2: filter output part
P: prism ST: aperture
100, 200, 300: optical system 110, 210, 310:
111, 211, 311: first incidence portion 112, 212, 312: first incidence portion
113, 213, 313: first support portion 114, 214, 314: first boundary
120, 220, 320: second lens 121, 221, 321:
122, 222, 322: second emitting part 123, 223, 323: second supporting part
124, 224, 324: second boundary 130, 230, 330: third lens
131, 231, 331: third incidence portion 132, 232, 332: third incidence portion
140, 240, 340: fourth lens 141, 241, 341: fourth incident portion
142, 242, 342: third support portion 143, 243, 343: third boundary
144, 244, 344: fourth exit part 145, 245, 345: lens projection
150, 250, 350: fifth lens 151, 251, 351: fifth incident portion
152, 252, 352: fifth emitting portion 160, 260, 360: sixth lens
161, 261, 361: sixth incidence portion 162, 262, 362: fourth support portion
163, 263, 363: fourth boundary 164, 264, 364:

Claims (10)

The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from the object side to the image side along the optical axis,
Wherein the first lens and the sixth lens have a negative refractive power,
Wherein the second lens and the fifth lens have a positive refractive power,
The third lens has a shape in which both an incident surface and an exit surface are convex,
Wherein the fourth lens has a concave shape in both an incident surface and an exit surface,
3.5 < F1 / F < 4.5.
Here, F1 is the focal length of the first lens, and F is the focal length of the entire optical system. The method according to claim 1,
5.0 < R1 / R2 < 7.0.
Here, R1 is the radius of curvature of the first incident portion formed on the incident surface of the first lens, and R2 is the radius of curvature of the first exit portion formed on the exit surface of the first lens. 3. The method of claim 2,
And a relationship of 120 DEG < FOV < 170 DEG is established.
Here, the FOV is called an angle of view. 4. The method according to any one of claims 1 to 3,
The third lens has a positive refractive power,
And the fourth lens has a negative refracting power. 4. The method according to any one of claims 1 to 3,
And a diaphragm for adjusting the amount of light incident on the upper surface of the wide-angle imaging optical system. 4. The method according to any one of claims 1 to 3,
Wherein an entrance surface and an exit surface of the first lens are respectively spherical surfaces. The method according to claim 6,
Wherein the entrance surface and the exit surface of the second lens to the sixth lens are aspherical surfaces, respectively. 4. The method according to any one of claims 1 to 3,
Wherein the first lens is formed with a convex first incidence portion on the side of the object side, and the first exit portion of the first lens forms a concave first exit portion with respect to the upper side,
And the diameter of the second lens is smaller than the diameter of the first exit portion. 9. The method of claim 8,
Wherein the second lens is formed with a convex second incident portion on the incident surface of the second lens with respect to the object side and a second output portion concave with respect to the image surface side is formed on the exit surface of the second lens,
And the diameter of the third lens is smaller than the diameter of the second exit portion. 9. The method of claim 8,
Wherein a diameter of the sixth lens is equal to or smaller than a diameter of the first emitting portion.

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