KR20150114305A - Lens assembly - Google Patents
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- KR20150114305A KR20150114305A KR1020140038798A KR20140038798A KR20150114305A KR 20150114305 A KR20150114305 A KR 20150114305A KR 1020140038798 A KR1020140038798 A KR 1020140038798A KR 20140038798 A KR20140038798 A KR 20140038798A KR 20150114305 A KR20150114305 A KR 20150114305A
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- Prior art keywords
- lens
- refractive power
- mobile terminal
- lenses
- lens assembly
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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
- G02B13/0045—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 five or more lenses
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The present invention relates to a lens assembly of a camera module, comprising: a first lens having positive refractive power in order from an object side; A second lens having a negative refractive power; A third lens having a negative refractive power; A fourth lens having positive refractive power; A fifth lens having positive refractive power; And a sixth lens having negative refractive power.
Description
The present invention relates to a lens assembly, and more particularly, to a lens assembly of a camera module used in a mobile terminal.
A terminal can be divided into a mobile / portable terminal and a stationary terminal depending on whether the terminal is movable or not. The mobile terminal can be divided into a handheld terminal and a vehicle mounted terminal according to whether the user can directly carry the mobile terminal.
The functions of mobile terminals are diversified. For example, there are data and voice communication, photographing and video shooting through a camera, voice recording, music file playback through a speaker system, and outputting an image or video on a display unit. Some terminals are equipped with an electronic game play function or a multimedia player function. In particular, modern mobile terminals can receive multicast signals that provide visual content such as broadcast and video or television programs.
Such a terminal has various functions, for example, a multimedia player having a complex function such as photographing or moving picture shooting, reproduction of music or video file, reception of game or broadcasting, . In order to support and enhance the functionality of such terminals, it may be considered to improve the structural and / or software parts of the terminal.
On the other hand, studies have been actively conducted to reduce the thickness of each component constituting the terminal according to the slimming trend of the mobile terminal. In particular, a thin thickness is required for a camera module which occupies a considerably large volume in a mobile terminal. Accordingly, in order to make a slim camera, it is required that the size of the image sensor is the same as or smaller than that of the conventional image sensor. In order to realize high resolution, the pixel size of the image sensor is small It will be inevitable. Therefore, the resolution of the lens must be increased in order to sufficiently gather the light in the reduced pixel. In order to obtain a sufficient resolution of the lens, inevitably, a large number of lenses must be used.
However, when a large number of lenses are used, the overall thickness of the lens assembly becomes thicker, which has led to a tendency to become slim recently, and since light is transmitted through many lenses, the brightness of the whole image is lowered due to reduction of light transmittance, A problem arises. Accordingly, there is a demand for a lens assembly of a new structure capable of realizing bright images of high quality while meeting the slimming trend of mobile terminals.
The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a lens assembly capable of realizing a high resolution bright image and a wide wide angle while slimming the camera module.
Another object of the present invention is to provide a lens assembly capable of realizing a high resolution bright image and a wide wide angle while maintaining high resolving power.
According to an aspect of the present invention, there is provided a zoom lens comprising: a first lens having positive refractive power in order from an object side; A second lens having a negative refractive power; A third lens having a negative refractive power; A fourth lens having positive refractive power; A fifth lens having positive refractive power; And a sixth lens having a negative refractive power.
According to another aspect of the present invention, there is provided an image pickup apparatus including a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, A fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power; And an image sensor for converting an optical signal incident from the lens assembly into an electrical signal.
Effects of the mobile terminal and the control method according to the present invention will be described as follows.
According to at least one of the embodiments of the present invention, when a large number of lenses are used to increase the resolving power of the lens assembly, the problem of thickness of the camera module necessarily occurs and the problem of brightness of the image due to reduction of light transmittance is effectively improved There are advantages to be able to.
Meanwhile, various other effects will be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.
FIG. 1A is a block diagram illustrating a mobile terminal according to the present invention; FIG.
FIG. 1B and FIG. 1C are conceptual diagrams illustrating an example of a mobile terminal according to the present invention in different directions; FIG.
2 is a diagram for describing a camera module of a mobile terminal according to the present invention;
3 is a view referred to explain the configuration of the lens assembly according to the first embodiment of the present invention;
4 is a graph illustrating aberration characteristics of a lens assembly according to a first embodiment of the present invention;
5 is a diagram for describing a configuration of a lens assembly according to a second embodiment of the present invention;
6 is a graph illustrating aberration characteristics of a lens assembly according to a second embodiment of the present invention;
FIG. 7 is a view referred to explain a configuration of a lens assembly according to a third embodiment of the present invention; FIG.
8 is a graph showing aberration characteristics of a lens assembly according to a third embodiment of the present invention;
9 is a view for explaining a change in an incident angle (CRA) according to a distance change between a lens assembly and an image sensor;
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.
The mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC A tablet PC, an ultrabook, a wearable device such as a smartwatch, a smart glass, and a head mounted display (HMD). have.
However, it will be appreciated by those skilled in the art that the configuration according to the embodiments described herein may be applied to fixed terminals such as a digital TV, a desktop computer, a digital signage, and the like, will be.
1A to 1C are block diagrams for explaining a mobile terminal according to the present invention, and FIGS. 1B and 1C are conceptual diagrams showing an example of a mobile terminal according to the present invention in different directions.
The
The
The
The
The
The
The
In addition, the
In addition to the operations related to the application program, the
In addition, the
The
At least some of the components may operate in cooperation with one another to implement a method of operation, control, or control of a mobile terminal according to various embodiments described below. In addition, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the
Referring to FIGS. 1B and 1C, the disclosed
Here, the terminal body can be understood as a concept of referring to the
The
A
In some cases, electronic components may also be mounted on the
As shown, when the
These
The
Meanwhile, the
The
1B and 1C, a
However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as needed, or placed on different planes. For example, the
The
The
In addition, the
The
The touch sensor may be a film having a touch pattern and disposed between the
In this way, the
The first
The
The
The
The first and
In this figure, the
The contents input by the first and
On the other hand, a rear input unit (not shown) may be provided on the rear surface of the terminal body as another example of the
The rear input unit may be disposed so as to overlap with the
When a rear input unit is provided on the rear surface of the terminal body, a new type of user interface using the rear input unit can be realized. When the
Meanwhile, the
The
The
And a
The
The
And a second
The terminal body may be provided with at least one antenna for wireless communication. The antenna may be embedded in the terminal body or formed in the case. For example, an antenna constituting a part of the broadcast receiving module 111 (see FIG. 1A) may be configured to be able to be drawn out from the terminal body. Alternatively, the antenna may be formed in a film type and attached to the inner surface of the
The terminal body is provided with a power supply unit 190 (see FIG. 1A) for supplying power to the
The
The
The
In the foregoing, the configuration of the
2 is a diagram for explaining a camera module of a mobile terminal according to the present invention.
2, a
The
The
The
First Embodiment
3 is a view for explaining the configuration of the lens assembly according to the first embodiment of the present invention. In the configuration of FIG. 3, the thickness, size, and shape of the lens are shown somewhat exaggerated for explanatory purposes, and the spherical or aspherical shape is not limited to this shape, but is only shown as one embodiment.
3, the
The light corresponding to the image information of the subject includes a
The aperture (S top , 305 are located at the front portion of the lens assembly 300 (i.e., the front portion of the first lens) to adjust the amount of light incident on the optical system. On the other hand, in another embodiment, the
The first to
The first through
Hereinafter, the term " Object Side "refers to the surface of the lens facing the object side with respect to the optical axis Z o , and" Image Side " Refers to the surface of the lens that faces the imaging surface with reference to the optical axis Z o .
The first lens 310 has a positive refractive power, and the object side surface S1 is convex. A
The
The
As described above, the
Also, the
For example, as shown in FIG. 9, in order to make the lens structure slimmer under the condition that the size and number of pixels of the image sensor are the same, the incident angle (CRA) incident on the imaging surface in the lens assembly must be large. In order to increase the size of the incident angle (CRA), lenses having a negative refracting power in the
3, the light collected through the first lens 310 having a positive refractive power is transmitted through the second and
The
The
It will be apparent to those skilled in the art that the conditional expressions described below are preferred embodiments for increasing the operative effect of the lens assembly and that the present invention is not necessarily constructed with the following conditions. For example, the lens configuration of the present invention may have an elevated action effect even if only the conditional formulas of some of the conditional expressions described below are satisfied.
[Conditional expression 1]
0.5 < K 1 / K t | < 1.5
[Conditional expression 2]
0.3 < K 2 / K t | < 1
[Conditional expression 3]
0.1 < K 3 / K t | <0.5
[Conditional expression 4]
0.3 < K 4 / K t | <0.5
[Conditional expression 5]
0.5 < K 5 / K t | <2
[Conditional expression 6]
1.5 < K 6 / K t | <2.5
Here, K: 1 / focal length (f) of the lens,
K 1 , K 2 , K 3 , K 4 , K 5 , K 6 : Refractive power of the first to sixth lenses,
K t : The refractive power of the entire lens.
The above conditional expressions 1 to 6 define the refractive powers of the first to
In addition, the aspherical surface referred to in the embodiments of the present invention is obtained from the known equation (1), and the 'E' used in the conic constant a and aspherical coefficients A, B, C, D, Represents a power of 10. For example, E + 01 represents 10 1 and E-02 represents 10 -2 .
Here, Z is the distance from the apex of the lens in the direction of the optical axis
c: The basic curvature of the lens
Y: Distance in the direction perpendicular to the optical axis
α: Conic constant
A, B, C, D, E, and F are the aspheric coefficients of the respective orders.
The following Table 1 shows the first to sixth lenses of the lens assembly according to the first embodiment of the present invention. At this time, the first to sixth lenses are designed to satisfy the above-mentioned conditional expressions.
Street
(f)
(|
K
n
/
K
t
|)
The symbol "* " next to the surface number in Table 1 indicates an aspherical surface.
Referring to Table 1, it can be confirmed that the conditional expressions (| K n / K t |) for the first to sixth lenses are 1.03, 0.61, 0.21, 0.34, 1.24 and 1.65, .
Also, the F-number of the
The half angle of view (HFOV) represents half of the viewing angle of the scene captured by the camera lens. Therefore, it can be confirmed that the wide angle of view can be ensured through the
Table 2 below shows the values of the aspherical coefficients of each lens forming the lens assembly according to the embodiment of Table 1.
FIG. 4 is a graph showing aberration characteristics of the lens assembly according to the first embodiment of the present invention. In FIG. 4, longitudinal spherical aberration, astigmatic field curves, and distortion are shown in order from the left. FIG.
In Fig. 4, the Y axis represents the size of the image, and the X axis represents the focal length (in mm) and distortion (in%). Generally, the closer the aberration curves are to the Y-axis, the better the aberration correction function is. Therefore, in the aberration diagram shown in FIG. 4, since the values of the images are adjacent to the Y-axis in almost all the fields, it is confirmed that the spherical aberration, the astigmatism, and the distortion aberration are both excellent values.
Second Embodiment
5 is a view for explaining a configuration of a lens assembly according to a second embodiment of the present invention.
5, the
The aperture (S top , 505 are located at the front portion of the lens assembly 300 (i.e., the front portion of the first lens) to adjust the amount of light incident on the optical system. On the other hand, in another embodiment, a
The first to
The
The
The
As described above, the
Also, the
The
The
Table 3 below shows the first to sixth lenses of the lens assembly according to the second embodiment of the present invention. At this time, the first to sixth lenses are designed to satisfy the above-mentioned conditional expressions.
Street
(f)
(|
K
n
/
K
t
|)
Referring to Table 3, it can be confirmed that the conditional expressions (| K n / K t |) for the first to sixth lenses satisfy 1.07, 0.42, 0.30, 0.36, 0.99 and 1.53, .
In addition, the F-number of the
Table 4 below shows the values of the aspherical coefficients of each lens forming the lens assembly according to the embodiment of Table 3. [
FIG. 6 is a graph showing aberration characteristics of a lens assembly according to a second embodiment of the present invention. FIG. 6 is a graph showing longitudinal aberration, astigmatic field curves, and distortion in the order from left to right. FIG.
In Fig. 6, the Y axis represents the size of the image, and the X axis represents the focal length (in mm) and distortion (in%). Generally, the closer the aberration curves are to the Y-axis, the better the aberration correction function is. Therefore, in the aberration diagram shown in FIG. 6, since the values of the images are adjacent to the Y-axis in almost all the fields, it is confirmed that the spherical aberration, astigmatism, and distortion aberration are both excellent values.
Third Embodiment
7 is a diagram for explaining a configuration of a lens assembly according to a third embodiment of the present invention.
7, the lens according to the third embodiment of the present invention,
The aperture (S top , 705 are located at the forefront portion of the lens assembly 700 (i.e., the front portion of the first lens) to adjust the amount of light incident on the optical system. Meanwhile, in another embodiment, a
The first to
The
The
The
As described above, the
Also, the
The
The
Table 5 shows the first to sixth lenses of the lens assembly according to the third embodiment of the present invention. At this time, the first to sixth lenses are designed to satisfy the above-mentioned conditional expressions.
Street
(f)
(|
K
n
/
K
t
|)
Referring to Table 5, it can be seen that the conditional expressions (| K n / K t |) for the first to sixth lenses satisfy 1.00, 0.50, 0.27, 0.46, 1.59, 1.99, .
In addition, the F-number of the
Table 6 below shows the values of the aspheric coefficients of each lens forming the lens assembly according to the embodiment of Table 5. < tb > < TABLE >
FIG. 8 is a graph showing aberration characteristics of a lens assembly according to a third embodiment of the present invention. FIG. 8 is a graph showing longitudinal aberration, astigmatic field curves, and distortion FIG.
8, the Y axis means the size of the image, and the X axis means the focal length (in mm) and distortion (in%). Generally, the closer the aberration curves are to the Y-axis, the better the aberration correction function is. Therefore, in the aberration diagram shown in FIG. 8, since the values of the images are adjacent to the Y-axis in almost all fields, it is confirmed that the spherical aberration, the astigmatism, and the distortion aberration are both excellent values.
In the present specification, three lens assemblies satisfying the above-described conditional formulas are exemplified and described in detail, but it should be understood that various other embodiments that conform to the above-described conditional expressions may be implemented. It will be self-evident.
As described above, the lens assembly according to the preferred embodiment of the present invention can realize a high-resolution bright image and a wide wide angle while slimming the camera module. In addition, the present lens assembly can realize a high resolution bright image and a wide wide angle while maintaining high resolving power.
The present invention described above can be implemented as computer readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer readable medium include a hard disk drive (HDD), a solid state disk (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, , And may also be implemented in the form of a carrier wave (e.g., transmission over the Internet). In addition, the computer may include a
300: lens assembly 310: diaphragm
320: first lens 330: second lens
340: third lens 350: fourth lens
360: fifth lens 370: sixth lens
380: Infrared filter 230: Image sensor
Claims (15)
A first lens having positive refractive power;
A second lens having a negative refractive power;
A third lens having a negative refractive power;
A fourth lens having positive refractive power;
A fifth lens having positive refractive power; And
And a sixth lens having a negative refractive power.
And a diaphragm disposed on an object side surface of the first lens to adjust an amount of light incident on the optical system.
Wherein the first lens has a convex surface on an object side.
And the second lens is concave on an upper side.
And the third lens has a concave object side surface.
Wherein the second and third lenses are made of a high refractive index plastic material having a refractive index of 1.6 or more.
Wherein at least one of an object side surface and an upper surface side of the first through sixth lenses is an aspherical surface.
And an infrared filter disposed on an upper side of the sixth lens to block infrared rays of light incident on the image sensor.
Wherein the first lens satisfies the condition (1).
[Conditional expression 1]
0.5 < K 1 / K t | < 1.5
Here, K 1 is the refractive power of the first lens, and K t is the refractive power of the entire lens.
And the second lens satisfies the condition (2).
[Conditional expression 2]
0.3 < K 2 / K t | < 1
Here, K 2 is the refractive power of the second lens, and K t is the refractive power of the entire lens.
And the third lens satisfies the condition (3).
[Conditional expression 3]
0.1 < K 3 / K t < 0.5
Here, K 3 is the refractive power of the third lens, and K t is the refractive power of the entire lens.
And the fourth lens satisfies the condition (4).
[Conditional expression 4]
0.3 < K 4 / K t < 0.5
Here, K 4 is the refractive power of the fourth lens, and K t is the refractive power of the entire lens.
And the fifth lens satisfies the condition (5).
[Conditional expression 5]
0.5 < K 5 / K t | < 2
Here, K 5 is a refractive power of the fifth lens, K t is a refractive power of the entire lens being.
And said sixth lens satisfies condition (6).
[Conditional expression 6]
1.5 < K 6 / K t < 2.5
Here, K 6 is the refractive power of the sixth lens, and K t is the refractive power of the entire lens.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020140038798A KR20150114305A (en) | 2014-04-01 | 2014-04-01 | Lens assembly |
PCT/KR2014/004887 WO2015152462A1 (en) | 2014-04-01 | 2014-06-02 | Lens assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020140038798A KR20150114305A (en) | 2014-04-01 | 2014-04-01 | Lens assembly |
Publications (1)
Publication Number | Publication Date |
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KR20150114305A true KR20150114305A (en) | 2015-10-12 |
Family
ID=54240758
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020140038798A KR20150114305A (en) | 2014-04-01 | 2014-04-01 | Lens assembly |
Country Status (2)
Country | Link |
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KR (1) | KR20150114305A (en) |
WO (1) | WO2015152462A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI612322B (en) * | 2015-12-01 | 2018-01-21 | 先進光電科技股份有限公司 | Optical image capturing system |
TWI671565B (en) | 2018-09-26 | 2019-09-11 | 大立光電股份有限公司 | Imaging optical system, image capturing unit and electronic device |
CN110208927B (en) * | 2019-07-12 | 2024-04-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
CN111025543B (en) * | 2019-12-23 | 2021-11-16 | 诚瑞光学(常州)股份有限公司 | Image pickup optical lens |
CN111929872B (en) * | 2020-09-21 | 2021-01-05 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
CN112255771B (en) * | 2020-12-21 | 2021-03-09 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
CN112781839B (en) * | 2020-12-30 | 2023-03-17 | 森思泰克河北科技有限公司 | Lens performance test system |
CN112904535B (en) * | 2021-02-07 | 2022-09-02 | 浙江舜宇光学有限公司 | Image pickup lens assembly |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100773922B1 (en) * | 2006-10-23 | 2007-11-07 | 방주광학 주식회사 | Wide angle slim lens system for camera |
KR100932850B1 (en) * | 2008-12-29 | 2009-12-21 | 주식회사 나노포토닉스 | Fisheye lens |
KR101158419B1 (en) * | 2010-09-30 | 2012-06-22 | 삼성전기주식회사 | Lens system |
KR20120128985A (en) * | 2011-05-18 | 2012-11-28 | 엘지이노텍 주식회사 | Refractive index variable lens and camera module using the same |
KR101910411B1 (en) * | 2011-06-07 | 2018-10-22 | 엘지이노텍 주식회사 | Imaging lens and camera module |
-
2014
- 2014-04-01 KR KR1020140038798A patent/KR20150114305A/en not_active Application Discontinuation
- 2014-06-02 WO PCT/KR2014/004887 patent/WO2015152462A1/en active Application Filing
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