KR20160145330A - Subminiature wide-angle image pickup lens system - Google Patents

Subminiature wide-angle image pickup lens system Download PDF

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Publication number
KR20160145330A
KR20160145330A KR1020150081755A KR20150081755A KR20160145330A KR 20160145330 A KR20160145330 A KR 20160145330A KR 1020150081755 A KR1020150081755 A KR 1020150081755A KR 20150081755 A KR20150081755 A KR 20150081755A KR 20160145330 A KR20160145330 A KR 20160145330A
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South Korea
Prior art keywords
lens system
lens
plastic lens
angle
wide
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KR1020150081755A
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Korean (ko)
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KR101722565B1 (en
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전소라
박가희
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주식회사 엔투에이
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives

Abstract

The present invention relates to a subminiature wide-angle photographing lens system installed in a camera of a tablet PC or mobile phone. The system includes: an aperture placed sequentially from an object; a first plastic lens having positive refractive power, formed to be convex to an image and the object, and having at least one surface aspherical; a second plastic lens having negative refractive power, formed into a meniscus shape of which object side and image side are all convex to the image, and having at least one surface aspherical; and a third plastic lens having positive refractive force, having the center of the upper surface dented upward, and having at least one surface aspherical. The following condition is satisfied. 1.55 < TTL/F < 1.65, 0.475 < BFL/F. In this condition, TTL is the whole length of the lens system, BFL is a distance from a spot, in which the upper surface of the third plastic lens meets an optical axis, to the upper surface, and F is a focus distance of the entire lens optical system. Therefore, the subminiature wide-angle photographing lens system is capable of keeping stable MTF of the optical system, while at the same time reducing weight and costs by reducing the number of lenses more than an existing photographing lens system as well as forming a wide angle more than 80 degrees of view angle.

Description

[0001] The present invention relates to a subminiature wide-angle image pickup lens system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-small wide-angle imaging lens system used in a mobile phone, a tablet PC camera, and the like.

2. Description of the Related Art [0002] In recent years, a wide angle of view and high performance are required simultaneously for a camera mounted on a small mobile product. The objective is to realize a wide angle of view angle of 80 ° or more based on the high-definition and miniaturization of optical lenses. Accordingly, there is an increasing tendency to increase the number of pixels of the camera or to increase the resolution by increasing the number of lenses. In particular, in the conventional mobile wide-angle lens system, in order to realize a wide angle, more than four plastic lenses or some glass lenses are often mixed.

For this purpose, when four or more aspherical plastic lenses or glass lenses are mixed and used, there is a problem that the price is increased by using a large number of lenses. In addition, although the total length of the optical system is limited, there is a problem that the size of the space for accommodating the lens becomes large to realize high performance, and the space on the rear surface of the lens becomes narrow.

The edge and the center thickness of the lens configured to match the size of the entire optical system become thin, so that it sometimes becomes difficult to realize stable optical performance as the optical axis is distorted in the assembled state of the lens. This also affects the yield and productivity of the imaging lens system.

Korean Patent Application No. 10-2012-0158535

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a miniature wide-angle imaging lens system which can reduce the number of lenses and provide a wide angle image with a view angle of 80 degrees or less at a low cost.

According to an aspect of the present invention, there is provided an ultra-small wide-angle imaging lens system comprising: a diaphragm; A first plastic lens having positive refractive power and being convexly formed on the object side and the image side and having at least one aspheric surface; A second plastic lens having a negative refracting power, the object side surface and the upper surface both being formed into a meniscus type convex upward, and at least one surface being an aspherical surface; A third plastic lens having a positive refracting power, the center of the upper surface being concave upward and convex toward the periphery, and at least one surface being aspherical; And the following conditions are satisfied.

1.55 < TTL / F < 1.65

0.475 < BFL / F

Here, TTL is the total length of the lens system, BFL is the distance from the point where the optical axis of the third plastic lens meets the optical axis to the top surface, and F is the focal length of the entire lens optical system.

Further, the ultra-small wide-angle imaging lens system satisfies the following conditions.

0.6 < f1 / F < 0.75

0.5 < | f1 / f2 | < 0.8

Here, f1 is the focal length of the first plastic lens, f2 is the focal length of the second plastic lens, and F is the focal length of the entire lens optical system.

Further, the ultra-small wide-angle imaging lens system satisfies the following conditions.

0.36 < R3f / F < 0.4

Here, R3f is the radius of curvature of the center of the object side of the third plastic lens, and F is the focal length of the entire lens optical system.

The mobile phone according to another embodiment includes any one of the miniature wide-angle imaging lens systems.

According to the present invention, there is provided an ultra-small wide-angle imaging lens system capable of realizing a wide angle of view angle of 80 ° or more and reducing the number of lenses compared to the conventional optical lens system, achieving low cost and weight, and stably maintaining the MTF of the optical system. can do.

1 is a diagram showing the configuration of an imaging lens system according to an embodiment of the present invention.
Fig. 2 is a view for tracking the flow of light when an object is photographed in the imaging lens system of Fig. 1. Fig.
3 is a spherical aberration diagram according to an embodiment of the imaging lens system of Fig.
4 is a schematic of the astigmatic gradients according to the embodiment of the imaging lens system of FIG.
5 is a distortion aberration diagram according to an embodiment of the imaging lens system of Fig.
6 is an MTF graph according to an embodiment of the imaging lens system of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. The same reference numerals in the drawings denote like elements throughout the drawings.

1 is a diagram showing the configuration of an imaging lens system according to an embodiment of the present invention. Fig. 2 is a view for tracking the flow of light when an object is photographed in the imaging lens system of Fig. 1. Fig. 3 is a spherical aberration diagram according to an embodiment of the imaging lens system of Fig. 4 is a schematic of the astigmatic gradients according to the embodiment of the imaging lens system of FIG. 5 is a distortion aberration diagram according to an embodiment of the imaging lens system of Fig. 6 is an MTF graph according to an embodiment of the imaging lens system of FIG.

The imaging lens system 100 of the present invention can be used by being mounted on a camera for a mobile phone, a camera for a tablet PC, and the like.

The imaging lens system 100 includes a diaphragm 101, a first plastic lens L1, a second plastic lens L2, a third plastic lens L3, and an optical filter 140 in this order from the object side .

Aperture 101 adjusts the size of the aperture to adjust the amount of light passing through the lens.

The first plastic lens L1 is made of plastic and has a positive refractive power and the object side surface 111 is convex on the object side and the upper side 112 is convex on the image side. At least one of the object side surface 111 and the upper side surface 112 of the first plastic lens L1 is formed as an aspherical surface, and preferably both surfaces are formed as an aspherical surface.

The second plastic lens L2 is formed of plastic and can be formed into a meniscus type convex upward with the object side surface 121 and the upper side surface 122 both having a negative refractive power. The center of the upper surface 122 of the second plastic lens L2 may be convex upward and concave toward the periphery. In addition, the second plastic lens L2 can be formed such that the center of the object side surface 121 is convex upward and concave toward the periphery. This shape of the object side surface 121 and the upper side surface 122 of the second plastic lens L2 is for uniformly spreading the light on the upper surface 150. [ At least one of the object side surface 121 and the upper side surface 122 of the second plastic lens L2 is formed as an aspherical surface, and preferably both surfaces are formed as an aspherical surface.

The third plastic lens L3 is formed of plastic and has a positive refractive power. The third plastic lens L3 may be formed such that the center of the upper surface 132 is concave upward and convex toward the periphery. In addition, the third plastic lens L3 can be formed such that the center of the object side surface 131 is convex toward the object side and concave toward the periphery. This shape of the object side surface 131 and the upper side surface 132 of the third plastic lens L3 is for evenly spreading the light on the upper surface 150. [

In the present invention, the first plastic lens L1, the second plastic lens L2, and the third plastic lens L3 are all made of plastic, so that reduction in aberration and reduction in size and weight of the optical system can be realized. Further, each lens includes at least one aspherical surface, and cost reduction and aberration generation can be suppressed.

The imaging lens system of the present invention can satisfy the following conditional expression (1).

1.55 < TTL / F < 1.65 [Conditional expression 1]

Here, TTL (total track length) is the total length of the lens system (distance from the first surface to the top surface 150), and F is the focal length of the entire lens system.

The conditional expression (1) is a condition for attaining high resolution and simultaneously achieving high performance and miniaturization by reducing the entire length of the lens system. If it deviates from the lower limit value of conditional expression 1, it becomes difficult to satisfy the required angle of view angle or more. If the upper limit of the conditional expression (1) is exceeded, the required angle of view is satisfied, but the length of the lens system increases, making it difficult to downsize. Table 1 below shows design data of the imaging lens system of the present invention satisfying the conditional expression (1).

TTL F Conditional expression 1 Example 2.8 1.752 1.598

The imaging lens system of the present invention can satisfy the following conditional expression (2).

0.475 < BFL / F [Conditional expression 2]

Here, BFL is the distance from the point where the upper surface 132 of the third plastic lens L3 meets the optical axis a to the upper surface 150, and F is the focal length of the entire optical system of the lens.

The conditional expression (2) is a condition for achieving wide-angle photographing at the same time of securing a clearance space behind the lens. If it deviates from the lower limit value of conditional expression (2), it is easy to reduce the overall length of the lens system, but it is difficult to secure the space behind the lens while satisfying the required angle of view. Table 2 below shows design data of the imaging lens system of the present invention satisfying the conditional expression (2).

BFL F Conditional expression 2 Example 0.84 1.752 0.479

The imaging lens system of the present invention can satisfy the following conditional expression (3).

0.6 < f1 / F < 0.75 [Conditional expression 3]

Here, f1 is the focal length of the first plastic lens L1, and F is the focal length of the entire lens system.

The ratio of the focal length of the first plastic lens L1 to the focal length of the entire lens system is an important design factor. The first plastic lens L1 is the first lens positioned in the lens system.

Condition (3) is a condition for reducing the length of the entire lens system and correcting spherical aberration and chromatic aberration. The deviation from the lower limit of the conditional expression (3) is easy to downsize the optical system. However, as the refractive power of the first plastic lens (L1) increases, the power distribution increases and the aberration is not corrected.

When the upper limit value of the conditional expression 3 is deviated, the refracting power of the first plastic lens L1 is relatively weakened, so that the exit concave position moves toward the upper surface 150. [ Accordingly, the incident angle of the light beam incident on the imaging lens is increased and the generation of spherical aberration can be suppressed, but the total length of the lens system is increased. In addition, the refracting power of the second plastic lens L2 and the third plastic lens L3 becomes strong, and it becomes difficult to correct the chromatic aberration of magnification. Table 3 below shows design data of the imaging lens system of the present invention satisfying the conditional expression 3.

f1 F Conditional expression 3 Example 1.205 1.752 0.687

The imaging lens system of the present invention can satisfy the following conditional expression (4).

0.5 <| f1 / f2 | <0.8 [Conditional expression 4]

Here, f1 is the focal length of the first plastic lens L1, and f2 is the focal length of the second plastic lens L2.

Condition (4) is a condition for securing the rear clearance space and manufacturing convenience. The refractive power of the first plastic lens L1 increases and it becomes difficult to secure the BFL which is the distance from the upper surface 132 to the upper surface 150 of the third plastic lens L3. If the BFL is not secured, the rear space of the lens becomes narrow and the manufacturing convenience is degraded. If the upper limit of the conditional expression (4) is exceeded, the refracting power of the second plastic lens L2 is increased and the BFL can be secured easily, but the overall length of the lens system becomes long, making it difficult to reduce the size and weight. Table 4 below shows design data of the imaging lens system of the present invention satisfying the conditional expression 4.

f1 f2 Conditional expression 4 Example 1.205 -1.790 0.673

The imaging lens system of the present invention can satisfy the following conditional expression (5).

0.36 < R3f / F < 0.4 [Conditional expression 5]

Here, R3f is the radius of curvature of the center of the object side surface 131 of the third plastic lens L3, and F is the focal length of the entire lens optical system.

The conditional expression (5) is a condition for securing the reduction of the length of the entire lens system and the angle of view. If the distance from the lower limit of the conditional expression 5 is exceeded, the radius of curvature of the center of the object side surface 131 of the third plastic lens L3 becomes small, so that it becomes difficult for the light rays to be uniformly distributed to the top surface 150 and the angle of view becomes difficult to secure. If the upper limit of the conditional expression 5 is exceeded, the radius of curvature of the center of the object side surface 131 of the third plastic lens L3 becomes large, and it becomes difficult to correct the chromatic aberration of magnification. Table 5 below shows design data of the imaging lens system of the present invention satisfying the conditional expression (5).

R3f F Conditional expression 5 Example 0.682 1.752 0.389

Example

Hereinafter, a specific embodiment of the imaging lens system to which the configuration of the present invention is applied will be described.

The following table relates to numerical data of the optical elements constituting the imaging lens system. The unit of distance or length value applied in the table is "mm". The symbol "*" next to the face number indicates that it is aspherical.

Table 6 below shows design data of the imaging lens system according to this embodiment.

Face number Radius of curvature Thickness or distance (t) Refractive index (Nd) Abbe number (Vd) Remarks One -0.03 Aperture (101) 2 0.02 * 3 1.4798 0.4060 1.5311 55.9 The first plastic lens * 4 -1.0261 0.1710 * 5 -0.5848 0.3550 1.635 23.9 Second plastic lens * 6 -1.4780 0.1940 * 7 0.6822 0.4620 1.5311 55.9 Third plastic lens * 8 0.7706 0.1670 9 0.36 10 0.21 Optical Filters (140) 11 0.1012 12 0 The upper surface 150,

Here, both of the first to third plastic lenses L1, L2, and L3 are formed as aspheric surfaces.

The aspherical shape of each lens is defined by the following equation. Conic The E used for the constant and aspheric coefficients and the numbers following it represent powers of ten.

Figure pat00001

Z: Distance from the lens apex to the optical axis direction

Y: Distance from the optical axis to the lens surface (height)

K: Conic constant (eccentricity)

C: paraxial curvature (= 1 / R)

R: Paraxial radius of curvature

Ai: Aspheric constant (i means the order of the aspherical coefficient)

Table 7 below shows the conic constant and aspherical coefficient for each lens in the embodiment of the present invention.

Face number K A4 A6 A8 A10 * 3 -31.4853 7.9475.E-01 -1.2259.E + 01 5.0492.E + 01 -2.0841.E + 02 * 4 2.9395 -1.0306.E + 00 2.0194.E + 00 -4.4609.E + 00 1.0849.E + 01 * 5 -0.8866 -1.1550.E + 00 1.1440.E + 01 -1.4873.E + 01 -1.0787.E-01 * 6 -3.0000 -1.6000.E + 00 8.0115.E + 00 -8.4253.E + 00 1.1853.E + 00 * 7 -5.2806 -9.4495.E-01 1.4317.E + 00 -1.4117.E + 00 6.6011.E-01 * 8 -1.0808 -1.1016.E + 00 1.3136.E + 00 -1.0960.E + 00 5.1573.E-01

Table 8 below shows the performance values of the imaging lens system according to the preferred embodiment of the present invention.

f 1 1.205 FOV 82.07 f 2 -1.790 TTL 2.80 f 3 3.962 OAL 2.42 F 1.752 FBL 0.60 F-number (= F / D) 2.4 BFL 0.84

3 is a longitudinal spherical aberration diagram according to an embodiment of the present invention, and shows spherical aberration according to each wavelength. Here, the spherical aberration is an aberration caused by changing the focal distance according to the height at which a ray enters the entrance pupil, which is the only aberration of the axial object point. That is, the spherical aberration increases rapidly as the incident height of the light beam increases. In order to correct this, it is necessary to utilize an aspherical surface or minimize the change of incidence angle due to the incidence of incidents using high refractive index materials. In Fig. 3, the spherical aberration according to each wavelength is maintained at a good level.

4 illustrates the aberration characteristics of a tangential plane (T) and a sagittal plane (S) with respect to the height of the top surface 150 as an astigmatic diagram according to an embodiment of the present invention. As shown, the astigmatism exhibits good characteristics.

The curvature of the upper surface 150 is an aberration appearing when the upper surface 150 is seen to be bent into a curved surface rather than a flat surface. When the focus is on the center, the periphery is blurred. When the focus is on the periphery, the center is blurred. Although a little aberration correction can be performed by tightening the aperture of the diaphragm 101, this is corrected by the depth of field, but there is little correction effect when the enlargement magnification is large. When the astigmatism is corrected in the case of the curvature of the upper surface 150, the curvature of the upper surface 150 is almost eliminated.

5 illustrates distortion along the height of the top surface 150 in an embodiment of the present invention. Distortion aberration does not cause the image to be blurred or spread, but focus is oblique but oblique. Barrel type distortion occurs mainly from the center of the screen toward the outside, and a pincushion type distortion occurs from the periphery of the screen toward the center. As shown, the distortion aberration exhibits good characteristics.

6 is an MTF graph in an embodiment of the present invention. In the graph, the horizontal axis represents the field angle, and the vertical axis represents the modulation transfer function (MTF). The modulation transfer function represents the degree to which a pixel pair can be decomposed. When a certain image (various kinds of spatial frequencies) passes through the lens system, the modulation transfer function value becomes "1" when the image is reproduced at the same brightness, and becomes "0" when the image disappears completely from the image surface. From the graph, it can be seen that the MTF maintains a good state while providing a wide-angle image of an angle of view of 80 degrees or more.

As described above, the imaging lens system according to the embodiment of the present invention is designed to satisfy the conditional expressions 1 to 5. Such an imaging lens system may satisfy all of the conditional expressions, and only some of them may be satisfied.

Further, in the imaging lens system of the present invention, all the lenses are made of plastic, so that aberrations can be reduced and the optical system can be made compact and lightweight. Each lens includes at least one aspherical surface, It is possible.

Further, the imaging lens system of the present invention can use three plastic lenses to reduce the number of lenses, thereby making it possible to provide a wide-angle image with a view angle of 80 degrees or more and maintain a good image, while being small and lightweight and inexpensive.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

100: imaging optical system
101: Aperture
111, 121, 131: object side surface
112, 122, 132: upper side
140: Optical filter
150: upper surface
L1: first plastic lens
L2: Second plastic lens
L3: Third plastic lens

Claims (4)

In an ultra-small wide-angle imaging lens system,
A diaphragm in order from the object side;
A first plastic lens having positive refractive power and being convexly formed on the object side and the image side and having at least one aspheric surface;
A second plastic lens having a negative refracting power, the object side surface and the upper surface both being formed into a meniscus type convex upward, and at least one surface being an aspherical surface;
A third plastic lens having a positive refracting power, the center of the upper surface being concave upward and convex toward the periphery, and at least one surface being aspherical;
Lt; / RTI &gt;
Angle ultrasound imaging lens system satisfying the following conditions.
1.55 < TTL / F < 1.65
0.475 &lt; BFL / F
Here, TTL is the total length of the lens system, BFL is the distance from the point where the optical axis of the third plastic lens meets the optical axis to the top surface, and F is the focal length of the entire lens optical system. The method according to claim 1,
Angle ultrasound imaging lens system satisfying the following conditions.
0.6 < f1 / F < 0.75
0.5 < | f1 / f2 | < 0.8
Here, f1 is the focal length of the first plastic lens, f2 is the focal length of the second plastic lens, and F is the focal length of the entire lens optical system. The method according to claim 1,
Angle ultrasound imaging lens system satisfying the following conditions.
0.36 < R3f / F < 0.4
Here, R3f is the radius of curvature of the center of the object side of the third plastic lens, and F is the focal length of the entire lens optical system. 4. A mobile phone comprising the ultra-wide wide-angle imaging lens system according to any one of claims 1 to 3.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005345919A (en) * 2004-06-04 2005-12-15 Seiko Precision Inc Imaging lens
JP2006133270A (en) * 2004-11-02 2006-05-25 Matsushita Electric Ind Co Ltd Photographic lens
JP2006163340A (en) * 2004-12-03 2006-06-22 Samsung Electro-Mechanics Co Ltd Optical system for high resolution using plastic lens
KR100809252B1 (en) * 2006-10-10 2008-02-29 삼성전기주식회사 Subminiature optical system
KR20140089004A (en) 2012-12-31 2014-07-14 주식회사 코렌 Imaging lens system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005345919A (en) * 2004-06-04 2005-12-15 Seiko Precision Inc Imaging lens
JP2006133270A (en) * 2004-11-02 2006-05-25 Matsushita Electric Ind Co Ltd Photographic lens
JP2006163340A (en) * 2004-12-03 2006-06-22 Samsung Electro-Mechanics Co Ltd Optical system for high resolution using plastic lens
KR100809252B1 (en) * 2006-10-10 2008-02-29 삼성전기주식회사 Subminiature optical system
KR20140089004A (en) 2012-12-31 2014-07-14 주식회사 코렌 Imaging lens system

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