KR101215827B1 - Photographic lens optical system - Google Patents

Photographic lens optical system Download PDF

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KR101215827B1
KR101215827B1 KR1020110010291A KR20110010291A KR101215827B1 KR 101215827 B1 KR101215827 B1 KR 101215827B1 KR 1020110010291 A KR1020110010291 A KR 1020110010291A KR 20110010291 A KR20110010291 A KR 20110010291A KR 101215827 B1 KR101215827 B1 KR 101215827B1
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South Korea
Prior art keywords
lens
optical system
image sensor
lt
convex toward
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KR1020110010291A
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Korean (ko)
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KR20120089116A (en
Inventor
정필선
박형배
안치호
조재훈
김지은
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주식회사 코렌
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B9/00Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/60Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made
    • G02B1/04Optical elements characterised by the material of which they are made made of organic materials, e.g. plastics
    • G02B1/041Lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised 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 five or more lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/18Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00Exposure-making shutters; Diaphragms
    • G03B9/02Diaphragms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/2251Constructional details
    • H04N5/2254Mounting of optical parts, e.g. lenses, shutters, filters or optical parts peculiar to the presence or use of an electronic image sensor

Abstract

Disclosed is a photographing lens optical system. The disclosed lens optical system includes first, second, third, fourth, and fifth lenses sequentially arranged in an image sensor direction in a subject. The first lens may have a positive meniscus shape with positive refractive power and convex toward the subject. The second lens may have positive refractive power and its exit surface may be convex toward the image sensor. The third lens may have a negative refractive power and have a meniscus shape in which it is convex toward the image sensor. The fourth lens may have a positive meniscus shape with positive refractive power and convex toward the image sensor. The fifth lens may have negative refractive power, and at least one of its entrance and exit surfaces may be aspherical. An angle of view θ of the lens optical system and a focal length f3 of the third lens may satisfy Equation 2 <| tanθ / f3 | <6.

Description

Photography lens optical system

The present invention relates to an optical device, and more particularly, to a lens optical system employed in a camera.

Recently, cameras using solid-state imaging devices such as charge coupled devices (CCDs) and complementary metal oxide semiconductor image sensors (CMOS image sensors) are rapidly expanding. have.

In order to increase the resolution of a camera, the pixel integration degree of a solid-state image sensor is increasing. In addition, miniaturization and weight reduction of the camera are also progressing through the performance improvement of the lens optical system built into the camera.

In the lens optical system of a typical small camera (eg, a camera for a mobile phone), a large number of lenses including one or more glass lenses are used to secure the performance thereof. However, glass lenses not only have high manufacturing cost but also make it difficult to miniaturize the lens optical system due to molding constraints. In addition, in the case of the lens optical system used in conventional camera phones, it is common to have an angle of view of about 60 ~ 68 °.

There is a demand for the development of a lens optical system capable of achieving a high resolution, having a wide angle of view (wide angle), and solving a problem of a glass lens.

The technical problem to be achieved by the present invention is to improve the problems of the prior art described above, and to provide a lens optical system that has a wide angle of view and excellent performance and advantageous for miniaturization.

In order to achieve the above object, an embodiment of the present invention provides a first lens, a second lens, a third lens, a fourth lens, and a first lens, which are sequentially arranged from the subject side between the subject and the image sensor on which the image of the subject is formed. 5, wherein the first lens has positive refractive power, has a meniscus shape convex toward the subject, and the second lens has positive refractive power, and its exit surface is the image sensor. Side convex, the third lens has a negative refractive power and has a meniscus shape convex toward the image sensor, and the fourth lens has a positive refractive power and convex toward the image sensor. It has a shape, the fifth lens has a negative refractive power and at least one of its entrance surface and exit surface is provided as a lens optical system, characterized in that.

The lens optical system may satisfy at least one of Equations 1 to 4 below.

&Quot; (1) &quot;

2 <| tanθ / f3 | <6

Is the angle of view of the lens optical system, and f3 is the focal length of the third lens.

&Quot; (2) &quot;

0.5 <f1 / f2 <1.5

Here, f1 is a focal length of the first lens, f2 is a focal length of the second lens.

&Quot; (3) &quot;

Vd1> 50

Here, Vd1 is the Abbe's number of the first lens.

&Quot; (4) &quot;

Vd3 <25

Here, Vd3 is the Abbe's number of the third lens.

The incident surface of the second lens may be convex toward the subject.

The incident surface of the second lens may be convex toward the image sensor.

At least one of the first to fourth lenses may be an aspherical lens.

At least one of the entrance surface and the exit surface of at least one of the first to fourth lenses may be aspherical.

Each of the entrance and exit surfaces of the fifth lens may have a plurality of inflection points.

delete

The central portion of the incident surface of the fifth lens may be convex toward the subject and concave toward the edge. The center portion of the exit surface of the fifth lens may be concave with respect to the image sensor and may be convex while going to the edge.

The second, third, fourth and fifth lenses may be aberration correcting lenses.

An aperture may be further provided between the subject and the image sensor.

The aperture may be provided between the first lens and the second lens.

Infrared blocking means may be further provided between the subject and the image sensor.

The infrared blocking means may be provided between the fifth lens and the image sensor.

At least one of the first to fifth lenses may be a plastic lens.

The angle of view θ of the lens optical system may be 80 ° or more.

It is possible to implement a lens optical system that can obtain a large angle of view (wide angle) and high resolution.

More specifically, the lens optical system according to the embodiment of the present invention has a refractive power of positive (+), positive (+), negative (-), positive (+), and negative (-) sequentially arranged in the direction of the image sensor in the subject. It includes a first to fifth lens having a, may satisfy at least one of the above-described equations (1) to (4). Such a lens optical system may have a large field of view and excellent aberration correction performance, which may be advantageous for high performance of a camera.

In particular, when the incident surface and the exit surface of the fifth lens are aspherical surfaces having a plurality of inflection points, various aberrations can be easily corrected through the fifth lens, and vignetting is performed by reducing the emission angle of chief ray. Vignetting can also be prevented.

In addition, since the first to fifth lenses are made of plastic, and both surfaces (incident surface and exit surface) of each lens are composed of aspherical surfaces, the lens optical system is more compact and superior in performance than a glass lens. Can be implemented.

1 to 4 are cross-sectional views showing the arrangement of main components of the lens optical system according to the first to fourth embodiments of the present invention, respectively.
5 is an aberration diagram showing longitudinal spherical aberration, image curvature and distortion of the lens optical system according to the first embodiment of the present invention.
6 is aberration diagrams showing longitudinal spherical aberration, image curvature, and distortion of the lens optical system according to the second exemplary embodiment of the present invention.
7 is aberration diagrams showing longitudinal spherical aberration, image curvature and distortion of the lens optical system according to the third exemplary embodiment of the present invention.
8 is aberration diagrams showing longitudinal spherical aberration, image curvature, and distortion of the lens optical system according to the fourth exemplary embodiment of the present invention.
Description of the Related Art [0002]
I: First lens II: Second lens
III: Third Lens IV: Fourth Lens
Ⅴ: fifth lens Ⅵ: infrared blocking means
OBJ: Subject S1: Aperture
IMG: Image Sensor

Hereinafter, a lens optical system according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like (or similar) components throughout the description.

1 to 4 show a lens optical system according to the first to fourth embodiments of the present invention, respectively.

1 to 4, the lens optical system according to the exemplary embodiments of the present invention is sequentially arranged from the subject OBJ between the subject OBJ and the image sensor IMG that forms an image of the subject OBJ. A first lens I, a second lens II, a third lens III, a fourth lens IV and a fifth lens V are provided. The first lens I may be a meniscus lens having a positive refractive power and convex toward the object OBJ. The second lens II has a positive refractive power, and its exit surface 5 * may be convex toward the image sensor IMG side. The incident surface 4 * of the second lens II may be convex or concave toward the subject OBJ. The incident surface 4 * of the second lens II in the embodiment of FIG. 1 is convex toward the object OBJ side, and the incident surface 4 * of the second lens II in the embodiments of FIGS. 2 to 4. Is convex toward the image sensor (IMG) side. Accordingly, the second lens II may be a biconvex lens (FIG. 1) or a meniscus-shaped lens convex toward the image sensor IMG side (FIGS. 2 to 4). The third lens III may be a meniscus lens having a negative refractive power and convex toward the image sensor IMG side. The fourth lens IV may be a meniscus lens having positive refractive power and convex toward the image sensor IMG. At least one of the first to fourth lenses I to IV may be an aspheric lens. In other words, the entrance face (1 *, 4 *, 6 *, 8 *) and the exit face (2 *, 5 *, 7 *, 9 *) of at least one of the first to fourth lenses I to IV. At least one of may be aspherical. For example, the entrance surfaces 1 *, 4 *, 6 *, 8 * and the exit surfaces 2 *, 5 *, 7 *, 9 * of each of the first to fourth lenses I to IV are both aspherical. Can be. The fifth lens V may have negative refractive power, and at least one of the incident surface 10 * and the exit surface 11 * of the fifth lens V may be aspherical. For example, each of the incident surface 10 * and the exit surface 11 * of the fifth lens V may be an aspherical surface having a plurality of inflection points. The number of inflection points is a curve corresponding to the incident surface 10 * of the cross-sectional view of the fifth lens V of FIGS. 1 to 4 (hereinafter, the first curve) and a curve corresponding to the exit surface 11 * (hereinafter, Second inflection point). That is, each of the first and second curves may have a plurality of inflection points. The center portion of the incident surface 10 * of the fifth lens V may be convex toward the subject OBJ and may be concave toward the edge, and the center portion of the exit surface 11 * may be concave and edged with respect to the image sensor IMG. Can become convex as The first lens I may have a strong positive refractive power, and the second to fifth lenses II, III, IV, and V may function as an aberration correcting lens.

Aperture S1 and infrared ray blocking means VI may be further provided. The aperture S1 may be provided between the first lens I and the second lens II. The infrared ray blocking means VI may be provided between the fifth lens V and the image sensor IMG. The infrared blocking means VI may be an infrared blocking filter. The positions of the diaphragm S1 and the infrared ray blocking means VI may vary.

It is preferable that the lens optical system according to the embodiments of the present invention having the above-described configuration satisfies at least one of the following Equations 1 to 4.

&Quot; (1) &quot;

2 <| tanθ / f3 | <6

Is the angle of view of the lens optical system, and f3 is the focal length of the third lens III.

Equation 1 shows a condition for determining an angle of view of the lens optical system. When | tan [theta] / f3 | is less than or equal to the lower limit value (2) in the equation (1), spherical aberration and coma aberration may be small, but the angle of view is also small. On the other hand, when | tan [theta] / f3 | is greater than or equal to the upper limit (6), spherical aberration and coma aberration may be large, although it is advantageous to expand the angle of view. When the condition of Equation 1 is satisfied, a wide angle of view can be obtained while maintaining spherical aberration and coma aberration in a good state. For reference, in the embodiment of the present invention, the angle of view θ of the lens optical system may satisfy 8 <tanθ <20.

&Quot; (2) &quot;

0.5 <f1 / f2 <1.5

Here, f1 is a focal length of the first lens I, and f2 is a focal length of the second lens II.

Equation 2 shows a condition for reducing spherical aberration of the lens optical system. Equation 2 also relates to the compactness of the lens optical system. When f1 / f2 in Equation 2 is lower than the lower limit (0.5), it is advantageous to compact the lens optical system, but spherical aberration may be large. On the other hand, when f1 / f2 is greater than or equal to the upper limit (1.5), spherical aberration correction is advantageous, but since the overall length of the lens optical system becomes long, compactness may become difficult.

&Quot; (3) &quot;

Vd1> 50

Here, Vd1 is the Abbe's number of the first lens (I).

&Quot; (4) &quot;

Vd3 <25

Here, Vd3 is the Abbe's number of the third lens III.

Equations 3 and 4 relate to the material conditions of the first lens I and the third lens III, respectively. The first lens I may be formed of a low dispersion lens material satisfying Equation 3, and the third lens III may be formed of a high dispersion lens material satisfying Equation 4. In this case, a correction effect of axial chromatic aberration and chromatic difference of magnification can be obtained.

In the above first to fourth embodiments of the present invention, the values of Equations 1 to 4 are as shown in Tables 1 to 3 below. In Table 1 and Table 2, the unit of view angle? Is °, and the units of focal lengths f1, f2, f3 are mm.

division θ f3 Equation 1
(2 <| tanθ / f3 | <6)
First Embodiment 84.3 -3.476 2.898 Second Embodiment 84.2 -3.506 2.798 Third Embodiment 86.9 -3.343 5.523 Fourth Embodiment 87.0 -3.434 5.556

division f1 f2 Equation 2
(0.5 <f1 / f2 <1.5)
First Embodiment 6.714 5.776 0.860 Second Embodiment 5.948 6.562 1.103 Third Embodiment 5.923 6.666 1.125 Fourth Embodiment 5.306 7.629 1.438

division Vd1
(Equation 3: Vd1> 50)
Vd3
(Equation 4: Vd3 <25)
First Embodiment 55.7 23 Second Embodiment 55.7 23 Third Embodiment 55.7 23 Fourth Embodiment 55.7 23

Referring to Tables 1 to 3, it can be seen that the lens optical system of the first to fourth embodiments satisfies Equations 1 to 4.

On the other hand, in the lens optical system according to the embodiments of the present invention having the above configuration, the first to fifth lenses (I to V), when considering the shape and dimensions (dimension), can be manufactured from plastic. That is, all of the first to fifth lenses I to V may be plastic lenses. In the case of a glass lens, it is difficult to miniaturize the lens optical system due to not only a high manufacturing cost but also constraints on the molding. However, since the first to fifth lenses I to V may all be made of plastic, Various benefits can be achieved accordingly. However, the materials of the first to fifth lenses I to V are not limited to plastics herein. If necessary, at least one of the first to fifth lenses I to V may be manufactured from glass.

Hereinafter, the first to fourth embodiments of the present invention will be described in detail with reference to the lens data and the accompanying drawings.

Tables 4 to 7 show curvature radii, lens thicknesses, or distances between lenses, refractive indices, Abbe's numbers, and the like, for respective lenses of the lens optical system of FIGS. 1 to 4, respectively. In Tables 4 to 7, R is the radius of curvature, D is the lens thickness or lens spacing or the distance between adjacent components, Nd is the refractive index of the lens measured using the d-line, Vd is the Abbe number . In the lens surface number, * indicates that the lens surface is aspheric. And the unit of R value and D value is mm.

First Embodiment if R D Nd Vd I One* 1.7520 0.4136 1.53 56 2* 3.1481 0.1090 S1 Infinity 0.1000 4* 9.4315 0.4000 1.53 56 5 * -4.5090 0.2821 6 * -1.9237 0.3511 1.63 23 7 * -15.3938 0.1000 8* -5.4316 1.2947 1.54 56 9 * -0.7809 0.1000 10 * 3.1122 0.5016 1.53 56 11 * 0.7452 0.6990 VI 12 Infinity 0.3000 1.51 64.1 13 0.6964 IMG Infinity

Second Embodiment if R D Nd Vd I One* 1.7549 0.4646 1.53 56 2* 3.5651 0.1005 S1 Infinity 0.1623 4* -500 0.4000 1.53 56 5 * -3.4773 0.2525 6 * -1.9590 0.3200 1.63 23 7 * -16.5874 0.1000 8* -6.1292 1.2996 1.54 56 9 * -0.7820 0.1000 10 * 3.7595 0.5240 1.53 56 11 * 0.7549 0.6285 VI 12 Infinity 0.3000 1.51 64.1 13 0.7790 IMG Infinity

Third Embodiment if R D Nd Vd I One* 1.8569 0.4192 1.53 56 2* 4.1503 0.1000 S1 Infinity 0.1200 4* -121.1810 0.4008 1.53 56 5 * -3.4586 0.2939 6 * -1.9174 0.3200 1.63 23 7 * -19.9491 0.1000 8* -6.6233 1.2968 1.54 56 9 * -0.7838 0.1000 10 * 3.1372 0.5100 1.53 56 11 * 0.7395 0.5748 VI 12 Infinity 0.3000 1.51 64.1 13 0.8322 IMG Infinity

Fourth Embodiment if R D Nd Vd I One* 1.7873 0.4647 1.53 56 2* 4.4102 0.1136 S1 Infinity 0.1523 4* -23.6039 0.3500 1.53 56 5 * -3.4893 0.2805 6 * -2.0487 0.3666 1.63 23 7 * -2.0487 0.1000 8* -6.4183 1.2899 1.54 56 9 * -0.7711 0.1000 10 * 3.5844 0.5196 1.53 56 11 * 0.7439 0.6168 VI 12 Infinity 0.3000 1.51 64.1 13 0.6814 IMG Infinity

Meanwhile, the aperture ratio Fno, the focal length f, and the angle of view θ of the lens optical system according to the first to fourth embodiments of the present invention, respectively, corresponding to FIGS. 1 to 4 are shown in Table 8 below. . Here, the focal length f is the focal length of the entire lens optical system.

division Fno Focal Length (f) [mm] Angle of view (θ) [°] First Embodiment 2.8 3.4019 84.3 Second Embodiment 2.8 3.5039 84.2 Third Embodiment 2.8 3.4019 86.9 Fourth Embodiment 2.8 3.3922 87.0

In addition, in the lens optical system according to the first to fourth embodiments of the present invention, the aspherical surface of each lens satisfies the aspherical equation (5).

<Equation 5>

Figure 112011008249166-pat00001

Where x is the distance from the vertex of the lens in the optical axis direction, y is the distance in the direction perpendicular to the optical axis, c 'is the inverse of the radius of curvature at the vertex of the lens (= 1 / r), and K is Conic constants, and A, B, C, D and E represent aspherical coefficients.

Tables 9 to 12 show aspherical surface coefficients of the aspherical surface in the lens system according to the first to fourth embodiments corresponding to FIGS. 1 to 4, respectively. That is, Tables 9 to 12 show the entrance planes (1 *, 4 *, 6 *, 8 *, 10 *) and exit planes (2 *, 5 *, 7 *, 9) of each lens of Tables 4 to 7, respectively. *, 11 *) aspheric coefficients.

if K A B C D E One* -0.2082 0.0036 -0.0180 0.0173 -0.0646 -0.1396 2* -4.7200 -0.0080 -0.1091 0.0359 0.0300 -0.3258 4* 20.1562 -0.0843 -0.1113 0.0180 -0.4255 -0.0076 5 * 15.9764 -0.1579 -0.1804 0.0111 -0.3150 -0.0875 6 * 0.8931 -0.3215 -0.2129 -0.0484 -0.2780 -0.1425 7 * 99 -0.1170 0.0192 0.0015 -0.0059 -0.0032 8* 7.8564 0.0141 -0.0316 0.0021 0.0008 0.0006 9 * -3.0633 -0.1449 0.0451 -0.0103 -0.0032 0.0010 10 * -16.1384 -0.0528 0.0023 0.0020 -0.0001 -4.6804e-5 11 * -4.3612 -0.0461 0.0090 -0.0014 0.0001 5.7955e-6

if K A B C D E One* -0.0763 0.0045 -0.0051 0.0189 -0.0502 -0.1394 2* -3.3511 -0.0107 -0.0857 0.0318 0.0408 -0.3258 4* 99 -0.0873 -0.2021 0.3638 -0.9791 -0.0076 5 * 17.4528 -0.1339 -0.1719 0.0779 -0.2262 -0.0875 6 * 1.2552 -0.3324 -0.1716 -0.0490 -0.2057 -0.1425 7 * 75.0483 -0.1436 0.0316 0.0001 -0.0089 -0.0033 8* 9.1917 0.0118 -0.0378 0.0048 0.0026 0.0008 9 * -3.1097 -0.1399 0.0464 -0.0106 -0.0031 0.0010 10 * -18.1120 -0.0587 0.0031 0.0021 -0.0001 -4.7445e-5 11 * -4.4828 -0.0476 0.0092 -0.0014 0.0001 5.2856e-6

if K A B C D E One* -0.1406 0.0032 -0.0115 0.0232 -0.0616 -0.1394 2* -5.2934 -0.0145 -0.0774 0.0216 0.0468 -0.3258 4* -99 -0.0824 -0.1932 0.3738 -0.9313 -0.0076 5 * 16.9509 -0.1257 -0.1507 0.1046 -0.2233 -0.0875 6 * 1.2347 -0.3338 -0.1652 -0.0106 -0.1877 -0.1425 7 * 99 -0.1488 0.0333 -0.0013 -0.0107 -0.0048 8* 9.7262 0.0140 -0.0403 0.0043 0.0022 0.0006 9 * -3.0869 -0.1415 0.0473 -0.0103 -0.0030 0.0010 10 * -13.4818 -0.0597 0.0036 0.0021 -0.0001 -4.8627e-5 11 * -4.2396 -0.0489 0.0094 -0.0014 0.0001 4.9560e-6

if K A B C D E One* -0.0091 0.0069 -0.0043 0.0172 -0.0348 -0.1394 2* -0.4017 -0.0042 -0.0759 0.1001 -0.0026 -0.3258 4* 93.1251 -0.0792 -0.1577 0.2557 -0.9120 -0.0076 5 * 18.8782 -0.1282 -0.1622 0.0632 -0.2582 -0.0875 6 * 1.4684 -0.3352 -0.1927 -0.0826 -0.2382 -0.1425 7 * 3.1377 -0.1384 0.0249 0.0016 -0.0064 -0.0026 8* 4.5724 0.0123 -0.0326 0.0054 0.0025 0.0008 9 * -3.0470 -0.1430 0.0459 -0.0101 -0.0030 0.0010 10 * -16.2408 -0.0595 0.0030 0.0022 -0.0001 -4.4728e-5 11 * -4.4237 -0.0468 0.0088 -0.0014 0.0001 5.6430e-6

FIG. 5 shows the longitudinal spherical aberration, astigmatic field curvature and distortion of the lens optical system according to the first embodiment of the present invention (ie, the lens optical system having the numerical values shown in Table 4). Aberration diagram showing distortion.

Figure 5 (a) shows the spherical aberration of the lens optical system for light of various wavelengths, (b) is the image curvature of the lens optical system, that is, tangential field curvature (T1 ~ T5) and the spherical image curvature It shows (sagittal field curvature) (S1 ~ S5). (a) The wavelengths of light used for obtaining the data were 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm. (b) The wavelength used to obtain T1 and S1 of the data was 656.2725 nm, the wavelength used to obtain T2 and S2 was 587.5618 nm, the wavelength used to obtain T3 and S3 was 546.0740 nm, and to obtain T4 and S4. The wavelength used was 486.1327 nm, and the wavelength used to obtain T5 and S5 was 435.8343 nm. (c) The wavelength of light used to obtain the data was 546.0740 nm. The same applies to FIGS. 6 to 8.

(A), (b) and (c) of FIG. 6 are longitudinal spherical aberration and image curvature of the lens optical system according to the second embodiment of the present invention (FIG. 2), that is, the lens optical system having numerical values shown in Table 5. And aberration diagram showing distortion.

(A), (b) and (c) of FIG. 7 are longitudinal spherical aberration and image curvature of the lens optical system according to the third embodiment of the present invention (FIG. 3), that is, the lens optical system having numerical values shown in Table 6. And aberration diagram showing distortion.

8A, 8B, and 8C are longitudinal spherical aberration and image curvature of the lens optical system according to the fourth embodiment (Fig. 4) of the present invention, that is, the lens optical system having the numerical values shown in Table 7. And aberration diagram showing distortion.

As described above, the lens optical system according to the exemplary embodiments of the present invention includes positive, positive, negative, and positive lenses that are sequentially arranged in the direction of the image sensor IMG from the subject OBJ. ), Including the first to fifth lenses I to V having negative refractive power, and satisfying at least one of Equations 1 to 4 described above. Such a lens optical system can have a large angle of view of about 80 ° or more, and can easily correct various aberrations. Therefore, according to the embodiment of the present invention, it is possible to implement a lens optical system that can obtain a large angle of view and high resolution.

In particular, in the lens optical system according to the exemplary embodiment of the present invention, when the incident surface 10 * and the exit surface 11 * of the fifth lens V are aspherical surfaces having a plurality of inflection points, the fifth lens V The aberration can be easily corrected, and vignetting can be prevented by reducing the emission angle of chief ray.

In addition, since the first to fifth lenses I to V are made of plastic and both surfaces (incident surface and exit surface) of each lens I to V are aspherical surfaces, they are compact at a lower cost than using a glass lens. It is possible to implement a lens optical system with excellent performance.

While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention. For example, it will be appreciated by those skilled in the art that a blocking film may be used in place of the filter as the infrared blocking means VI. It will be appreciated that various other modifications are possible. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical spirit described in the claims.

Claims (21)

  1. A first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are sequentially arranged from the subject side, between the subject and the image sensor on which the image of the subject is formed;
    The first lens has a positive refractive power and has a meniscus shape in which it is convex toward the subject.
    The second lens has positive refractive power and its exit surface is convex toward the image sensor;
    The third lens has a negative refractive power and has a meniscus shape convex toward the image sensor.
    The fourth lens has a positive refractive power and a meniscus shape convex toward the image sensor.
    The fifth lens has a negative refractive power and at least one of its entrance face and exit face is an aspherical surface,
    Equation 0.5 <f1 / f2 <1.5 is established between the focal length f1 of the first lens and the focal length f2 of the second lens,
    The Abbe's number (Vd1) of the first lens and the Abbe's number (Vd3) of the third lens satisfy at least one of equations Vd1 &gt; 50 and Vd3 &lt; 25.
  2. The method of claim 1,
    And the following equation holds between the angle of view (θ) of the lens optical system and the focal length (f3) of the third lens.
    &Lt; Equation &
    2 <| tanθ / f3 | <6
  3. delete
  4. delete
  5. delete
  6. The method of claim 1,
    The lens optical system of which the incident surface of the second lens is convex toward the subject.
  7. The method of claim 1,
    The lens optical system of which the incident surface of the second lens is convex toward the image sensor.
  8. The method of claim 1,
    At least one of the first to fourth lenses is a lens optical system.
  9. The method of claim 1,
    At least one of the incident surface and the exit surface of at least one of the first to fourth lenses of the lens optical system.
  10. The method of claim 1,
    The optical system of claim 5, wherein each of the entrance and exit surfaces of the fifth lens has a plurality of inflection points.
  11. delete
  12. The method of claim 1,
    The center portion of the incident surface of the fifth lens is convex toward the subject and concave toward the edge,
    And a center portion of the exit surface of the fifth lens is concave with respect to the image sensor and is convex toward the edge.
  13. The method of claim 1,
    And the second, third, fourth and fifth lenses are aberration correcting lenses.
  14. The method of claim 1,
    A lens optical system having an aperture disposed between the first lens and the second lens.
  15. The method of claim 1,
    Lens optical system further comprises an infrared ray blocking means between the subject and the image sensor.
  16. The method of claim 15,
    The infrared blocking means is a lens optical system provided between the fifth lens and the image sensor.
  17. The method of claim 1,
    At least one of the first to fifth lenses is a lens optical system.
  18. The method of claim 1,
    An angle of view (θ) of the lens optical system is 80 ° or more.
  19. A first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are sequentially arranged from the subject side, between the subject and the image sensor on which the image of the subject is formed;
    The first lens has a positive refractive power and has a meniscus shape in which it is convex toward the subject.
    The second lens has positive refractive power and its exit surface is convex toward the image sensor;
    The third lens has a negative refractive power and has a meniscus shape convex toward the image sensor.
    The fourth lens has a positive refractive power and has a meniscus shape in which it is convex toward the image sensor, and each of the entrance and exit surfaces thereof is convex toward the image sensor at its central portion.
    The fifth lens has a negative refractive power and at least one of its entrance face and exit face is an aspherical surface,
    Equation 2 <| tanθ / f3 | <6 holds between an angle of view (θ) of the lens optical system and a focal length (f3) of the third lens.
  20. The method of claim 19,
    The lens optical system of the following equation holds between the focal length f1 of the first lens and the focal length f2 of the second lens.
    &Lt; Equation &
    0.5 <f1 / f2 <1.5
  21. 21. The method according to claim 19 or 20,
    A lens optical system that satisfies at least one of the following equations further.
    &Lt; Equation &
    Vd1> 50
    Vd3 <25
    Here, Vd1 is the Abbe's number of the first lens, and Vd3 is the Abbe's number of the third lens.
KR1020110010291A 2011-02-01 2011-02-01 Photographic lens optical system KR101215827B1 (en)

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TWI463167B (en) * 2013-04-12 2014-12-01 Largan Precision Co Ltd Image capturing lens system
CN104007539B (en) * 2014-01-27 2016-05-25 玉晶光电(厦门)有限公司 Optical imaging lens and apply the electronic installation of this optical imaging lens

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007264180A (en) 2006-03-28 2007-10-11 Fujinon Corp Imaging lens
JP2009294528A (en) * 2008-06-06 2009-12-17 Fujinon Corp Imaging lens composed of five lenses and imaging apparatus
JP2010256608A (en) 2009-04-24 2010-11-11 Konica Minolta Opto Inc Imaging lens, imaging optical device and digital apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007264180A (en) 2006-03-28 2007-10-11 Fujinon Corp Imaging lens
JP2009294528A (en) * 2008-06-06 2009-12-17 Fujinon Corp Imaging lens composed of five lenses and imaging apparatus
JP2010256608A (en) 2009-04-24 2010-11-11 Konica Minolta Opto Inc Imaging lens, imaging optical device and digital apparatus

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