KR101785506B1

KR101785506B1 - Ultra wide angle lens module

Info

Publication number: KR101785506B1
Application number: KR1020150155874A
Authority: KR
Inventors: 오규환; 손영태; 문일춘
Original assignee: 대원전광주식회사
Priority date: 2015-11-06
Filing date: 2015-11-06
Publication date: 2017-10-17
Also published as: KR20170053408A

Abstract

The ultra-wide angle lens module of the present invention includes a first lens unit 110 consisting of a spherical lens to change the path of incident light and emit the focused light; A second lens unit 130 including a spherical lens for correcting chromatic aberration of light emitted from the first lens unit 110 and outputting the corrected light; A diaphragm 120 disposed between the first lens unit 110 and the second lens unit 130; And a third lens unit 140 including both aspheric lenses so as to change the path of light emitted from the second lens unit 130 so as to widen the angle of view of either the horizontal angle of view or the vertical angle of view with respect to the image, ; &Lt; / RTI >

Description

ULTRA WIDE ANGLE LENS MODULE

The present invention relates to an ultra-wide angle lens module.

Generally, lenses that are mounted on a camera module of a small-sized device such as a mobile communication terminal, a computer, and a notebook, or are usable in various surveillance cameras such as CCTV and rear detection of a vehicle are preferably small and have a wide shooting range. In addition, the image captured by the camera module must be prevented from being distorted due to the influence of the ambient temperature change.

Prior art 1 relating to an ultra-wide angle lens module has been proposed to meet the above requirements. Prior Art 1 uses a small number of lenses to realize a wide angle of view (more than 180 degrees), prevents distortion, and prevents vignetting. However, it is necessary to support a wider angle of view, and since a plurality of spherical lenses are used, manufacturing of the lens is difficult and the cost is increased.

Also, Prior Art 2 on a pinhole lens for a surveillance camera for a visible ray and a near-infrared ray having high resolution has been proposed. The prior art 2 has a high resolution by appropriately combining a spherical lens and an aspherical lens, but the manufacturing cost of the lens increases when the number of aspherical lenses increases. Further, in order to use it in a surveillance camera, it is necessary to develop a lens having a wider angle of view.

(Prior art 1) Korean Patent Laid-open Publication No. 10-2013-0056574 (published on May 30, 2013) (Prior Art 2) Korean Patent Registration No. 10-1123776 (Registered on February 28, 2012)

An object of the present invention is to provide an ultra-wide angle lens module which is easy to manufacture, low in cost, and has a wide angle of view.

The ultra-wide angle lens module of the present invention includes a first lens unit 110 consisting of a spherical lens to change the path of incident light and emit the focused light; A second lens unit 130 including a spherical lens for correcting chromatic aberration of light emitted from the first lens unit 110 and outputting the corrected light; A diaphragm 120 disposed between the first lens unit 110 and the second lens unit 130; And a third lens unit 140 including both aspheric lenses so as to change the path of light emitted from the second lens unit 130 so as to widen the angle of view of either the horizontal angle of view or the vertical angle of view with respect to the image, Wherein the first lens unit 110 has a negative refractive index and the first surface 1 is convex on the subject side and the second surface 2 is concave on the subject side, A first lens 10 having a curvature type and a negative refractive index and allowing the light having passed through the first lens 10 to be incident on the third lens 30, A second lens 20 having a concave second surface 4 concave on the subject side and a second lens 20 having positive refractive index and having one surface 5 convex on the subject side and the second surface 6 convex on the image side And a third lens 30 for allowing the light passing through the third lens 30 to pass through the diaphragm 120. The second lens unit 130 is composed of positive A fourth lens 40 having a first surface 7 convex on the object side and a second surface 8 convex on the image side and a first surface 9 having a refractive index of negative The third lens unit 140 has a positive refractive index and the first surface 11 has a positive refractive index and the second lens 10 has a concave surface and a concave second lens 10 is concave on the subject side. And the sixth lens 60 is convex on the object side and the second surface 12 is formed of a glass material convex upward. The incident angle and the focal length of the light from the first lens 10 to the sixth lens 60 are It is characterized by the following.

In addition, the ultra-wide angle lens module of the present invention includes a first lens unit 110 consisting of a spherical lens for changing the path of incident light, A second lens unit 130 including a spherical lens for correcting chromatic aberration of light emitted from the first lens unit 110 and outputting the corrected light; A diaphragm 120 disposed between the first lens unit 110 and the second lens unit 130; And a third lens unit 140 including both aspheric lenses so as to change the path of light emitted from the second lens unit 130 so as to widen the angle of view of either the horizontal angle of view or the vertical angle of view with respect to the image, Wherein the first lens unit 110 has a negative refractive index and the first surface 1a is convex on the subject side and the second surface 2a is concave on the subject side, A first lens 10a having a curvature type and a negative refractive index such that light having passed through the first lens 10a is made incident on the third lens 30a and the first surface 3a is made incident on the object side A second lens 20a which is convex and has a second surface 4a concaved toward the object side and a second lens 20a having a positive refractive index and one surface 5a being concave upward and the second surface 6a being convex upward And a third lens 30a through which the light having passed through the third lens 30a passes through the diaphragm 120. The second lens unit 130 includes a first lens 30a, A fourth lens 40a having a refractive index of positive (+) and a first surface 7a being convex on the subject side and a second surface 8a being convex on the image side, and a first surface 9a And the third lens unit 140 has a positive refractive index and is disposed on the first surface 50a of the first lens unit 50. The first lens 50a is concave upward and the second surface 10a is convex upward. And a sixth lens 60a whose first surface 11a is convex on the object side and the second surface 12a is formed of a glass material so as to be convex upward, and the light from the first lens 10a to the sixth lens 60a The incident angle and the focal length are characterized by the following.

In addition, the fourth lens (40, 40a) has a curvature radius on the subject side larger than a curvature radius on the image side on the upper side, and the fifth lens (50, 50a) has a curvature radius on the image side Larger than .

In addition, the fourth lens has a refractive index lower than that of the fifth lens and has a high Abbe number.

In addition, the view angle is characterized in that the view angle in the vertical direction is displayed on the sensor unit 150 to be wider.

According to the ultra-wide angle lens module and the camera using the ultra-wide angle lens module according to the present invention, an angle of view of 210 degrees or more is supported and the manufacturing cost is low. In addition, since it is less deformed by heat, it can be used in various environments.

1 is a structural view showing an embodiment of a camera employing an ultra-wide angle lens module according to the present invention.
2 is a structural view showing an embodiment of the structure of the super wide angle lens module shown in FIG.
3 is a structural view showing another embodiment of the structure of the ultra-wide angle lens module shown in FIG.
FIG. 4 is a view showing an image in which a horizontal angle of view and a vertical angle of view are formed on a sensor in the third lens unit shown in FIG. 1;
5A is a view showing an image formed on a sensor by an ultra-wide angle lens according to the present invention.
5B is a view showing an image formed on a sensor in a comparative example with the present invention.
FIG. 6A is a view showing an automobile equipped with a camera having a super wide angle lens module according to the present invention installed on a rear surface thereof.
FIG. 6B is a view showing an automobile provided with front and rear cameras using the ultra-wide angle lens module according to the present invention.

The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In this specification, the terms first, second, etc. are used to distinguish one element from another element, and the element is not limited by these terms.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

FIG. 1 is a structural view showing an embodiment of a camera employing an ultra-wide angle lens module according to the present invention, and FIG. 2 is a structural view illustrating an embodiment of the super wide angle lens module shown in FIG.

1 and 2, the ultra-wide angle lens module 100 includes a first lens unit 110 for changing the path of incident light and focusing the light, and a second lens unit 110 for emitting a chromatic aberration of light emitted from the first lens unit 110 A diaphragm 120 disposed between the first lens unit 110 and the second lens unit 130 and a light path of light emitted from the second lens unit 130 And a third lens unit 140 for widening the angle of view of either the horizontal angle of view or the vertical angle of view with respect to the image. The ultra-wide angle lens module 100 may further include a sensor unit 150 for receiving light that has passed through the third lens unit 140 of the ultra-wide angle lens module.

The first lens unit 110 can change and concentrate the path of the incident light so as to have a wide angle of view without deteriorating the resolution. The first lens unit 110 may include a first lens 10, a second lens 20, and a third lens 30 that change the path of light.

The first lens 10 is made of glass and is disposed closest to the subject side. Further, the first lens 10 may have a sectional shape that becomes thinner from the edge of the lens toward the optical axis. The first lens 10 may have a relatively larger size than the second lens 20 and the third lens 30. Further, the first lens 10 may be set such that the curvature radius of the first surface 1, which is the side surface of the subject, is larger than the curvature radius of the second surface 2 which is the upper side. The path of the light incident through the first surface 1 and the second surface 2 of the first lens 10 is changed so that all the light passing through the first lens 10 passes through the second lens 20, To be incident on the first surface (3). The first lens 10 can receive light having an incident angle of up to 210 degrees and change the path of light to change the angle of incidence of light incident on the second lens 20 up to 132 degrees. Therefore, the ultra-wide angle lens module 100 can ensure a wide angle of view due to the first lens 10. Also, the first lens 10 has a negative refractive index, and the first surface 1 may be a spherical surface convex to the subject side and the second surface 2 may be a spherical surface concave toward the subject side. Further, the first lens 10 may have a convex meniscus shape on the object side. Also, the first lens 10 may have a refractive index of 1.773 and an Abbe number of 49.6. In addition, the focal length of the first lens 10 may be -5.21 mm.

The second lens 20 is made of glass and disposed closer to the upper side than the first lens 10. The second lens 20 has a negative refractive index as shown in FIG. 2 and changes the path of the light passing through the first lens 10 so that all the light passing through the second lens 20 3 lens 30 as shown in FIG. Therefore, the resolution is not lowered. Further, the second surface 20 of the second lens 20, which is the upper surface, may be spherical and concave toward the object side. In addition, the second lens 20 may have a first surface 3, which is a side surface of the subject, is spherical and concave upward. At this time, the radius of curvature of the first surface 3 of the second lens 20 may be larger than that of the second surface 4. The second lens 20 may refract the light passing through the first lens 10 so that the maximum incident angle of the light incident on the third lens 30 is 69 degrees. Also, the second lens 20 may have a refractive index of 1.755 and an Abbe number of 52.3. Further, the focal length of the second lens 20 may be -2.74 mm.

The third lens 30 is made of glass and disposed closer to the upper side than the second lens 20. The third lens 30 changes the path of the light passing through the second lens 20 and passes the light through the third lens 30 through the diaphragm 120 so that the resolution is not lowered. 2, the third lens 30 is a spherical surface that is both a first side 5 and a second side 6 which are the upper side and the second side, respectively. The third lens 30 may be convex toward the subject and the upper side, . Further, the radius of curvature of the first surface 5 and the second surface 6 of the third lens 30 can be made constant. When the radius of curvature of the first surface 5 and the second surface 6 is constant, it is not necessary to distinguish the object side surface and the upper surface side of the third lens 30, Time can be shortened. The third lens 30 may refract light passing through the second lens 20 and pass through the diaphragm 120 so that the maximum incident angle of the light incident on the fourth lens 40 is 74 degrees. The refractive index of the third lens 30 may be 1.911 and the Abbe number may be 35.3. Also, the focal length of the third lens 30 may be 3.27 mm.

The second lens unit 130 can correct chromatic aberration. The second lens unit 130 may include a fourth lens 40 and a fifth lens 50. The fourth lens 40 and the fifth lens 50 may be in contact with each other to correct chromatic aberration .

The fourth lens 40 is made of glass and disposed closer to the upper side than the third lens 30. The fourth lens 40 has a positive refractive index and has a first surface 7 which is a side surface of the object convex on the subject side and a second surface 89 which is an upper surface contacting with the fifth lens 50, . &Lt; / RTI > Further, the fourth lens 40 can be realized such that the radius of curvature of the first surface 7 is larger than the radius of curvature of the second surface 8. The fourth lens 40 may refract the incident light through the third lens 30 to make the maximum incident angle of the light incident on the fifth lens 50 be 57.4 degrees.

The fifth lens 50 is made of glass and disposed closer to the upper side than the fourth lens 40. The fifth lens 50 has a negative refractive index and has a first surface 9 which is a side surface of the subject and which is in contact with the fourth lens 40 is concave upward and a second surface 10, As shown in Fig. In addition, the fifth lens 50 may have a larger radius of curvature of the second surface 10 than a curvature radius of the first surface 9. The fifth lens 50 may refract light incident through the fourth lens 40 and may cause the maximum incident angle of the light incident on the sixth lens 60 to be 135 degrees.

The fourth lens 40 may have a lower refractive index than the fifth lens 50 and may have a higher Abbe number. The fourth lens 40 may have a refractive index of 1.804 and an Abbe number of 46.5, and the fifth lens 50 may have a refractive index of 1.923 and an Abbe number of 20.9. Further, the fourth lens 40 and the fifth lens 50 are bonded to each other to have a focal length of -321.83 mm.

The diaphragm 120 may be disposed between the first lens unit 110 and the second lens unit 130 to adjust the amount of light incident through the first lens unit 110. That is, the diaphragm 120 adjusts the light amount according to the intensity of the light passing through the first lens unit 110.

The third lens unit 140 can widen one of the horizontal angle of view and the vertical angle of view. The third lens unit 140 includes a third lens unit 140 having a first surface 11 that is convex on the subject side and a second surface 12 that is an upper side convex on the image side and has an aspheric surface on both surfaces and a positive refractive index 6 lens 60 as shown in FIG. The sixth lens 60 may be formed of a glass material, and one of the horizontal angle of view and the vertical angle of view with respect to the image may be widened. At this time, since the horizontal angle of view of the sensor unit 150 is wider than the vertical angle of view, the angle of view in the vertical direction can be widened. Therefore, the angle of view can be increased in the diagonal direction. The sixth lens 60 may have a refractive index of 1.515 and an Abbe number of 63.4. Further, the sixth lens 6 may have a focal length of 2.88 mm.

The ultra-wide angle lens module 100 constructed as described above can refer to a lens close to the object around the diaphragm 120 as a group of lenses and a lens closer to the upper side around the diaphragm 120 as a group of lenses . That is, the lenses of the first group are the first lens 10, the second lens 20 and the third lens 30, and the lenses of the second group include the fourth lens 40, the fifth lens 50, 6 lens (60). In this case, the focal length of the first lens group may be -3.69 mm and the focal length of the second lens group may be 3.19 mm.

Also, the ultra-wide angle lens module 100 can be referred to as a group of lenses and a group of lenses, respectively, of a spherical lens and an aspherical lens. That is, the first to fifth lenses 10 to 50 may be referred to as a group of lenses, and the sixth lens 60 may be referred to as a group of lenses. In this case, the focal length of the first group of lenses may be 5.29 mm and the focal length of the second group of lenses may be 2.88 mm.

Table 1 below shows the curvature, thickness, and diameter of each lens.

Face number curvature Thickness (mm) Material (nd / vd) Diameter (mm) One 9.201 1.12 1.773 / 49.6 ф 12.36 2 2.650 1.98 ф 5.12 3 -145.088 0.50 1.755 / 52.3 ф 7.20 4 2.100 1.83 ф 3.58 5 5.692 1.06 1.911 / 35.3 ф 3.50 6 -5.692 0.38 ф 3.50 7 Stop 1.20 Φ 1.33 8 8.049 1.41 1.804 / 46.5 ф 3.50 9 -2.300 0.50 1.923 / 20.9 ф 3.50 10 15.115 0.10 ф 5.50 11 3.117 1.92 1.515 / 63.4 ф 5.50 12 -2,232 0.10 ф 5.50 13 Infinity 0.30 1.523 / 54.4 Ф 5.50

In Table 1, the surface number is an increment number of the surface of each lens in the order from the top to the top of the object. 1 denotes the surface number of the object side surface of the first lens 10, Quot; means the surface number of the upper surface of the substrate 10. 7 denotes a diaphragm and 13 denotes a surface of the sensor portion or the filter member.

Further, the object side surface and the image side surface of the sixth lens 60 satisfy the following expression (1).

Here, Z means sag at a specific position. C is the curvature (1 / r), k is the conic constant, and r is the curvature radius. And, A to E mean aspheric coefficients in order.

Table 2 below shows the characteristics of the sixth lens 60.

The sixth aspherical glass lens R1 (subject side) R2 (upper side) Curvature (r) 3.117 -2,232 Kornic constant (K) 0 0 A -3.213E-02 2.313E-02 B 1.586E-02 5.791E-03 C -5.198E-03 -8.443E-04 D 1.018E-03 2.291E-04 E -8.266E-05 7.963E-06

The ultra-wide angle lens module 100 can be manufactured from glass materials of the first to sixth lenses 10 to 60 and the filter member 80. Since the glass material is less deformed by heat, The super-wide-angle lens is less deformed by heat, and resolution is not changed even in a temperature range of -40 to 85, so resolution can be assured in various environments.

Since the manufacturing cost of the aspherical lens is higher than that of the spherical lens, the ultra-wide angle lens module 100 allows only the sixth lens 60 of the first to sixth lenses 10 to 60 to be constructed of an aspherical lens, Can be lowered.

The ultra-wide angle lens module 100 may include a sensor unit 150 for sensing an image generated by light emitted from the third lens unit 140. The sensor unit 150 includes a sensor 70 for receiving light, a cover glass 80 for protecting the sensor 70, and a filter member 90 for filtering the light irradiated to the sensor 70 . The sensor unit 150 operates upon receiving power from the power source unit 160 shown in FIG. 1, and the image of the subject can be projected through the light incident through the first lens unit to the third lens unit 140, , CMOS can be used. In addition, the filter member 90 may be an IR cut-off filter for blocking infrared rays. In addition, the filter member 90 may be an infrared (IR) pass filter capable of transmitting infrared rays. However, the present invention is not limited thereto. Further, the filter member 90 may be made of glass. Here, the filter member 90 is shown adjacent to the sensor unit 150, but it is not limited thereto and may be formed integrally with the sensor unit 150. Further, the filter member 90 may be formed integrally with the third lens unit 140. The filter member 90 may be omitted depending on the intended use of the lens.

3 is a structural view showing another embodiment of the structure of the ultra-wide angle lens module shown in FIG.

Referring to FIG. 3, the first lens 10a of the ultra-wide angle lens module 100 is made of glass and disposed closest to the subject side. Further, the first lens 10a may have a sectional shape that becomes thinner from the edge of the lens toward the optical axis. The first lens 10a may have a relatively larger size than the second lens 20a and the third lens 30a. In addition, the first lens 10a can be set such that the radius of curvature of the first surface 1a, which is the side surface of the subject, is larger than the radius of curvature of the second surface 2a, which is the upper surface. This changes the path of the light that is incident on the first surface 1a on the object side of the first lens 10a through the concave first surface 1a and the concave second surface 2a on the object side so that all the light passing through the first lens 10a Can be made incident on the first surface (3a) of the second lens (20a). Also, the first lens 10a can receive light having an incident angle of 210 degrees at most, and can change the light path to change the angle of incidence of light incident on the second lens 20a up to 135 degrees. Therefore, the ultra-wide angle lens module 100 can ensure a wide angle of view due to the first lens 10a. Also, the first lens 10a has a negative refractive index, and the first surface 1a and the second surface 2a can be spherical. Further, the first lens 10a may have a convex meniscus shape on the object side. Also, the first lens 10a may have a refractive index of 1.603 and an Abbe number of 65.5. In addition, the focal length of the first lens 10a may be -7.87 mm.

The second lens 20a is made of glass and disposed closer to the upper side than the first lens 10a. The second lens 20a has a negative refractive index as shown in FIG. 3 and changes the path of the light passing through the first lens 10a so that all the light passing through the second lens 20a 3 lens 30a as shown in FIG. Therefore, the resolution is not lowered. In addition, the second surface 20a of the second surface 4a, which is the upper surface, may be spherical and concave on the subject side. In addition, the second lens 20a may have a first surface 3a, which is a side surface of the subject, is spherical and convex to the subject side. At this time, the radius of curvature of the first surface 3a of the second lens 20a may be larger than that of the second surface 4a. The second lens 20a may refract the light passing through the first lens 10a so that the maximum incident angle of the light incident on the third lens 30a is 70.7 degrees. In addition, the second lens 20a may have a refractive index of 1.603 and an Abbe number of 65.5. Further, the focal length of the second lens 20a may be -3.52 mm.

The third lens 30a is made of glass and disposed closer to the upper side than the second lens 20a. The third lens 30a changes the path of the light passing through the second lens 20a and passes through the third lens 30a through the diaphragm 120 so that the resolution is not lowered. The third lens 30a has a positive refractive index as shown in FIG. 3, and the first surface 5a, which is the side surface of the subject, is spherical and concave upward. Also, the first surface 5a may be judged not to be concave because the radius of curvature is very large. The second surface 6a, which is the upper surface of the third lens 30a, is a spherical surface and can be convex upward. Here, the first surface 5a of the third lens 30a and the second surface 6a of the upper surface 6a are shown as being convex, but the present invention is not limited thereto, The first surface 5a of the first surface 5a and the second surface 6a of the upper surface may be convex.

Further, the third lens 30a is configured to transmit the light passing through the second lens 20a And the maximum incident angle of the light incident on the fourth lens 40a through the diaphragm 120a is 79.2 degrees. The third lens 30a may have a refractive index of 2.000 and an Abbe number of 25.4. Further, the focal length of the third lens 30a may be 5.22 mm.

The second lens unit 130 can correct chromatic aberration. The second lens unit 130 may include a fourth lens 40a and a fifth lens 50a and the fourth lens 40a and the fifth lens 50a may contact each other to correct chromatic aberration .

The fourth lens 40a is made of glass and disposed closer to the upper side than the third lens 30a. The fourth lens 40a has a positive refractive index and has a first surface 7a which is a side surface of the object convex toward the object side and a second surface 8a which is an upper surface which is in contact with the fifth lens 50a, . &Lt; / RTI > Further, the fourth lens 40a can be realized such that the radius of curvature of the first surface 7a is larger than the radius of curvature of the second surface 8a. The fourth lens 40a may refract the incident light through the third lens 30a so that the maximum incident angle of the light incident on the fifth lens 50a is 30.1 degrees.

The fifth lens 50a is made of glass and disposed closer to the upper side than the fourth lens 40a. The fifth lens 50a has a negative refractive index and a first surface 9a which is a side surface of the subject in contact with the fourth lens 40a can be concave upward and a second surface 10a May be convex upward. The radius of curvature of the second surface 10a of the fifth lens 50a may be larger than the radius of curvature of the first surface 9a. The fifth lens 50a may refract light incident through the fourth lens 40a to have a maximum incident angle of 136.0 degrees with respect to the sixth lens 60a.

The fourth lens 40a may have a lower refractive index than the fifth lens 50a and may have a higher Abbe number. The fourth lens 40a may have a refractive index of 1.804 and the Abbe number may be 46.5 and the fifth lens 50a may have a refractive index of 1.923 and an Abbe number of 20.9. Further, the fourth lens 40a and the fifth lens 50a are bonded to each other to have a focal length of 17.54 mm.

The third lens unit 140 can widen one of the horizontal angle of view and the vertical angle of view. The third lens unit 140 includes a third lens unit 140 having a first surface 11a that is a convex surface facing the object side and a second surface 12a that is an upper surface is an aspheric surface convex upward and a positive lens having a positive refractive index, (60a). The sixth lens 60a may be formed of a glass material, and the horizontal angle of view and the vertical angle of view with respect to the image may be widened. At this time, since the horizontal angle of view of the sensor unit 150 is wider than the vertical angle of view, the angle of view in the vertical direction can be widened. Therefore, the angle of view can be increased in the diagonal direction. The sixth lens 60a may have a refractive index of 1.515 and an Abbe number of 63.4. Further, the focal length of the sixth lens 6 may be 2.97 mm.

The ultra-wide angle lens module 100 as described above can refer to a lens close to the object around the diaphragm 120 as a group of lenses and a lens close to the upper side around the diaphragm 120a as a group of lenses . That is, the first group of lenses may be a first lens, a second lens, and a third lens, and the second group of lenses may be a fourth lens, a fifth lens, and a sixth lens. At this time, the focal length of the first lens group is -86.24 mm and the focal length of the second lens group is 2.93 mm.

Also, the ultra-wide angle lens module 100 can be referred to as a group of lenses and a group of lenses, respectively, of a spherical lens and an aspherical lens. That is, the first to fifth lenses 10a to 50a may be referred to as a group of lenses, and the sixth lens 60a may be referred to as a group of lenses. In this case, the focal length of the first lens group is 7.51 mm and the focal length of the second lens group is 2.97 mm.

Table 3 below shows the curvature, thickness, and diameter of each lens.

Face number curvature Thickness (mm) Material (nd / vd) Diameter (mm) 1a 11.449 0.8 1.603 / 65.5 ф 12.5 2a 3.266 2.28 ф 6.2 3a 198.169 0.50 1.603 / 65.5 ф 5.8 4a 2.100 1.98 ф 3.62 5a -150,000 0.97 2.000 / 25.4 2.92 6a -5.065 0.62 ф 2.68 7a Stop 0.42 Ф 1.22 8a 8.049 1.41 1.804 / 46.5 ф 3.50 9a -2.300 0.50 1.923 / 20.9 ф 3.50 10a -179.365 0.10 2.72 11a 4.755 1.96 1.515 / 63.4 ф 3.32 12a -1.940 ф 3.30 13a Infinity 0.30 1.523 / 54.4 ф 5.50

Table 4 below shows the characteristics of the sixth lens 60a.

The sixth aspherical glass lens R1 (subject side) R2 (upper side) Curvature (r) 4.755 -1.940 Kornic constant (K) 0 0 A -1.040E-02 6.060E-02 B 1.370E-02 -3.420E-02 C -9.300E-04 3.320E-02 D -4.100E-04 -1.200E-02 E 7.680E-05 2.000E-03

FIG. 4 is a view showing an image in which a horizontal angle of view and a vertical angle of view are formed on a sensor in the third lens unit shown in FIG. 1;

4, light passing through the first lens unit 110 and the second lens unit 130 of the ultra-wide angle lens module 100 appears as a circle, and the sensor unit 150 has a rectangular shape . Accordingly, the sensor unit 150 can receive the light irradiated to the rectangular portion corresponding to the sensor unit 150 among the light that has passed through the first lens unit 110 and the second lens unit 130. The sensor unit 150 can be operated by receiving power from the power supply unit 160 shown in FIG. At this time, the sensor unit 150 has a predetermined ratio between the horizontal direction and the vertical direction. When the light passing through the first lens unit 110 and the second lens unit 130 is refracted by the third lens unit 140, And the third lens unit 140 does not exist, the images located at A and B outside the sensor unit 150 are displayed on the A 'and B' in the sensor unit 150 by the third lens unit 140, So that the angle of view of the camera becomes wider. The viewing angle in the diagonal direction can be widened even if the sensor unit 150 is constant. Therefore, when the angle of view in the horizontal direction is 190 degrees, the angle of view in the diagonal direction can be 210 degrees.

FIG. 5A is a view showing an image formed on a sensor by an ultra-wide angle lens module according to the present invention, and FIG. 5B is a view showing an image formed on a sensor in a comparative example of the present invention.

Referring to FIGS. 5A and 5B, it can be seen that the image at the point A in FIG. 4A does not appear in FIG. 5B when the angle of view in the vertical direction is widened. In addition, the vignetting phenomenon does not appear much because the amount of ambient light is not sufficient.

FIG. 6A is a view showing an automobile equipped with a super wide-angle lens module according to the present invention, and FIG. 6B is a view illustrating an automobile equipped with a super wide-angle lens module according to the present invention on a front surface and a rear surface.

6A, a camera 200 equipped with an ultra-wide angle lens module shown in FIG. 1 is disposed at the center of the rear surface of the automobile 600 to monitor the rear surface of the automobile 600, It is possible to prevent a crash of the automobile 600 by making it possible to recognize an object. In addition, as shown in FIG. 5B, the camera 200 is installed not only on the rear surface but also on the front surface of the vehicle, so that both the rear surface and the front surface of the vehicle can be monitored. The camera 200 disposed on the rear and front surfaces of the automobile can monitor the sides of the automobile 600 because the angle of view is wide and can monitor the surroundings of the automobile 600 with only the camera 200 disposed on the rear surface and the front surface. At this time, the automobile 500 is provided with an image processing unit (not shown) for processing the image transmitted from the camera 200 installed on the rear and front sides of the vehicle, and a display unit (not shown) for displaying the image processed by the image processing unit And the image processing unit processes the image received from the camera installed on the rear and front sides of the vehicle to generate an image that can display all the surroundings of the vehicle and display it on the display unit so that the image displayed on the display unit So that the environment around the automobile can be grasped.

Here, the camera 200 is illustrated as being disposed on the rear and / or the front of the vehicle 600, but the present invention is not limited thereto. A camera may be disposed on the left and right sides of the vehicle 600, It is also possible to process an image photographed by a side camera to generate an image that allows more thorough monitoring of the surroundings of the automobile 600. [

The functions of the various elements shown in the drawings of the present invention may be provided through use of dedicated hardware as well as hardware capable of executing software in association with appropriate software. When provided by a processor, such functionality may be provided by a single dedicated processor, a single shared processor, or a plurality of individual processors, some of which may be shared.

In the claims hereof, the elements depicted as means for performing a particular function encompass any way of performing a particular function, such elements being intended to encompass a combination of circuit elements that perform a particular function, Microcode, etc., coupled with suitable circuitry to perform the software for the computer system 100. The computer system 100 may include any type of software, including firmware, microcode, etc.,

Reference throughout this specification to " one embodiment ", etc. of the principles of the invention, and the like, as well as various modifications of such expression, are intended to be within the spirit and scope of the appended claims, it means. Thus, the appearances of the phrase " in one embodiment " and any other variation disclosed throughout this specification are not necessarily all referring to the same embodiment.

It will be understood that the term " connected " or " connecting ", and the like, as used in the present specification are intended to include either direct connection with other components or indirect connection with other components. Also, the singular forms in this specification include plural forms unless the context clearly dictates otherwise. Also, components, steps, operations, and elements referred to in the specification as " comprises " or " comprising " refer to the presence or addition of one or more other components, steps, operations, elements, and / or devices.

100: super wide angle camera module 110: first lens unit
120: diaphragm 130: second lens unit
140: Third lens unit 150: Sensor unit
160:

Claims

A first lens unit 110 consisting of a spherical lens for changing and concentrating the path of the incident light; A second lens unit 130 including a spherical lens for correcting chromatic aberration of light emitted from the first lens unit 110 and outputting the corrected light; A diaphragm 120 disposed between the first lens unit 110 and the second lens unit 130; And a third lens unit 140 including both aspheric lenses so as to change the path of light emitted from the second lens unit 130 so as to widen the angle of view of either the horizontal angle of view or the vertical angle of view with respect to the image, Lt; / RTI >
The first lens unit 110 includes a first lens unit 110 having a negative refractive index and having a first surface 1 convex on the subject side and a second surface 2 concave on the subject side, The lens 10 and the light having the negative refractive index and passing through the first lens 10 are made incident on the third lens 30 so that the first surface 3 is concave upward, A second lens 20 having a convex surface facing the object side, a second lens 20 having a convex surface facing the object side, a second lens 20 having a convex surface on the object side, And a third lens 30 for allowing light passing through the diaphragm 30 to pass through the diaphragm 120,
The second lens unit 130 includes a fourth lens 40 having a positive refractive index and having a first surface 7 convex on the subject side and a second surface 8 convex on the image side, And a fifth lens 50 having a first surface 9 concave toward the image side and a second surface 10 concave toward the object side,
The third lens unit 140 includes a sixth lens 60 having a positive refractive index and having a first surface 11 convex on the subject side and a second surface 12 convex on the top side, Respectively,
The light incident angle and the focal distance of the first lens (10) to the sixth lens (60) are as follows.

A first lens unit 110 consisting of a spherical lens for changing and concentrating the path of the incident light; A second lens unit 130 including a spherical lens for correcting chromatic aberration of light emitted from the first lens unit 110 and outputting the corrected light; A diaphragm 120 disposed between the first lens unit 110 and the second lens unit 130; And a third lens unit 140 including both aspheric lenses so as to change the path of light emitted from the second lens unit 130 so as to widen the angle of view of either the horizontal angle of view or the vertical angle of view with respect to the image, Lt; / RTI >
The first lens unit 110 is a meniscus type first lens unit having a negative refractive index and having a first surface 1a convex on the subject side and a second surface 2a concave on the subject side, The lens 10a and the light having the negative refractive index and having passed through the first lens 10a are made incident on the third lens 30a so that the first surface 3a is convex toward the object side, A second lens 20a having a concave surface 4a on the object side and a first lens 5 having a positive refractive index and having one surface 5a concave upward and a second surface 6a convex upward, And a third lens 30a through which light passing through the diaphragm 30a passes through the diaphragm 120,
The second lens unit 130 includes a fourth lens 40a having a positive refractive index and having a first surface 7a convex on the subject side and a second surface 8a convex on the image side, And a fifth lens 50a having a first surface 9a concave upward and a second surface 10a convex upward,
The third lens unit 140 includes a sixth lens 60a having a positive refractive index and having a first surface 11a convex toward the subject side and a second surface 12a convex upwardly, Respectively,
The light incident angle and the focal distance of the first lens (10a) to the sixth lens (60a) are as follows.

The method according to claim 1 or 2,
Wherein the curvature radius of the fourth lens (40,40a) is larger than the curvature radius of the upper surface, and the fifth lens (50,50a) has a curvature radius of the image side larger than a curvature radius of the object side Wherein the light source is a light source.

The method of claim 3,
The fourth lens (40, 40a) has a lower refractive index than the fifth lens (50, 50a) and has a higher Abbe number.

The method according to claim 1 or 2,
Wherein the angle of view of the ultra-wide angle lens module is larger than the angle of view of the vertical direction.