KR20110056864A - Dual lens optical system and digital camera module comprising the same - Google Patents

Abstract

PURPOSE: A dual lens optical system and a digital camera module comprising the same are provided to selectively take a picture of a light displaying the image of different subjects. CONSTITUTION: In a dual lens optical system and a digital camera module comprising the same, a first optical system has first lens group [lens group](G1-1), second lens group(G1-2), third lens group(G1-3), fourth lens group(G1-4) and fifth lens group(G1-5) which are arranged from an object to an image. The first lens group comprises a first reflecting mirror. The second lens group has a negative refraction power. The third lens group, the fourth lens group, and the fifth lens group a plus refraction power. The second optical system shares at least one optical device with the first optical system.

Description

Dual Lens Optical System and Digital Camera Module Comprising the Same

The present invention relates to a dual lens optical system and a digital camera module having the same, and more particularly, a plurality of optical systems are integrally integrated in order to selectively photograph light representing an image of a different subject (hereinafter referred to as "subject light"). It relates to a dual lens optical system and a digital camera module having the same.

Recently, digital cameras are getting smaller and thinner. Many cameras employ refractive optics for this purpose. Many digital cameras also use zoom optics to improve convenience. However, as the digital camera becomes smaller and thinner, the internal space of the digital camera decreases, so the focal length that can be adjusted only by the zoom optical system is limited. That is, there is a limit to increasing the optical zoom magnification. Therefore, it is necessary to simultaneously adopt a wide-angle, short-focus optical system in addition to the zoom optical system, there is a disadvantage that the volume is increased and the manufacturing cost increases because two sensors are required for the two optical systems.

On the other hand, as the spread of portable mobile communication devices has become more common, users' demands for not only basic communication functions but also related additional functions are diversified, and demand for mobile communication devices with added wireless Internet communication functions or digital camera functions is increasing. It is increasing.

Recently, a mobile communication device such as a camera phone capable of making video calls and taking pictures using a combination of a wireless Internet communication function and a digital camera function has emerged.

The mobile communication device includes two camera modules, that is, a camera module used for video calling and a camera module used for general photography. This is because, in video call shooting and general photography, in each case, the position of the subject is opposite to the screen of the mobile communication device. Thus, two optical modules and two image sensors are required to configure the two camera modules, and the manufacturing cost is increased in realizing them with high pixels and high functions in response to user demands.

The present invention is to provide a dual lens optical system and a digital camera module having the same by employing a plurality of optical system to improve the function while not increasing the volume and manufacturing cost.

According to an aspect of the present invention, there is provided a dual lens optical system having a first optical system and a second optical system having at least one reflecting member for selectively refracting optical axes from the first direction and the second direction toward the imaging device. The first optical system includes a first lens group including a first reflecting member, a second lens group having negative refractive power, and a positive refractive power in an order from an object side to an image side along an optical axis from the first direction. A dual lens optical system including a third lens group, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power, wherein the second optical system shares at least one optical element with the first optical system. do.

The first lens group has positive or negative refractive power. When changing from the wide mode to the tele mode, the first lens group and the third lens group are fixed, the second lens group moves to the image side, and the fourth lens group and the fifth lens The lens group moves to the object side.

The at least one optical element shared by the first optical system and the second optical system may include at least one optical element of the first lens group, the second lens group, and the third lens in the first optical system. Group, the fourth lens group, the fifth lens group, and the imaging device. In this embodiment, the optical axis from the second direction in the second optical system is refracted by the first reflecting member and directed to the image pickup device. In this embodiment, the first reflecting member has a first surface and a second surface facing each other, and the first direction and the second direction are opposite directions on the same axis. In this embodiment, the first reflecting member can move between a first position and a second position. Here, in the first position, the optical axis from the first direction is refracted by the first surface toward the imaging device, and the optical axis from the second direction is blocked by the second surface, and in the second position, the optical axis is blocked. The optical axis from two directions is refracted by the first surface toward the image pickup device and the optical axis from the first direction is blocked by the second surface.

In another embodiment, the at least one optical element shared by the first optical system and the second optical system is the third lens group, the fourth lens group, the fifth lens group, and the imaging device of the first optical system. In this embodiment, the second optical system includes a second reflecting member that deflects the optical axis from the second direction and directs it to the image pickup device.

The second optical system includes a first lens group including the second reflecting member and the third lens group in the first optical system in a sequence from an object side to an image side along an optical axis from the second direction, positive refractive power A second lens group having a and a third lens group having a positive refractive power. The first lens group of the second optical system may have negative refractive power.

The first direction and the second direction may be opposite to each other on the same axis. Alternatively, the first direction and the first direction may be the same direction on each other on the same axis. The second reflecting member may be selectively moved between a third position and a fourth position so that the subject light incident in the second direction is formed in the image pickup device. And a lens cover movably disposed in front of the first lens group of the two optical systems, wherein, in a first position, the object light incident in the second direction is blocked by the lens cover and in the first direction. While the incident object light is incident on the image pickup device, in the second position, the subject light incident on the second direction is refracted by the first surface of the second reflecting member to form the image pickup device and incident on the image pickup device. The subject light may be blocked by the second surface of the second reflecting member. On the contrary, in the first position, the subject light incident in the second direction is blocked by the second reflecting member, and the subject light incident in the first direction forms the image pickup device, whereas in the second position, the second subject light The subject light incident in the direction may be refracted by the first surface of the second reflecting member to form the image pickup device, and the subject light incident in the first direction may be blocked by the second surface of the second reflecting member.

The first optical system and the second optical system share at least a lens group for auto focus (AF).

According to another aspect of the present invention, there is provided a digital camera module having the first optical system and the second optical system, wherein the first optical system is used in a normal photographing mode and the second optical system is used in a self-photography or video call mode. do.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In the drawings, the size of each component may be exaggerated for clarity and convenience of description.

The dual lens optical system according to the embodiment of the present invention includes a first optical system and a second optical system. In an embodiment, the first optical system and the second optical system may be zoom optical systems each having a wide mode, a normal mode, and a tele mode. This embodiment is the dual lens optical system 100 shown in FIGS. 6 and 7. In another embodiment, the first optical system may be a zoom optical system having a wide angle mode, a normal mode, and a telephoto mode, and the second optical system may be an ultra wide angle short focus mode. These embodiments are the dual lens optics 200, 300, 400, 500 shown in FIGS. 8 to 11.

1 schematically illustrates a dual lens optical system according to embodiments of the present invention in a wide-angle mode, a normal mode, a telephoto mode, and a short focus mode for simulation of a dual lens optical system according to the embodiments illustrated in FIGS. 6 to 11. It is shown.

The first and second optical systems in the dual lens optical system 100 shown in FIGS. 6 and 7, and the first optical system in the dual lens optical systems 200, 300, 400, and 500 shown in FIGS. 8 to 11 are shown in FIG. 1. As shown in Fig. 1, the lens is composed of five lens groups G1-1, G1-2, G1-3, G1-4, and G1-5. The first optical system includes the first lens group G1-1, the second lens group G1-2, the third lens group G1-3, and the fourth lens group in the order from the object side to the image axis. G1-4) and a fifth lens group G1-5. The first optical system is a zoom lens optical system.

The first lens group G1-1 may include a first incident lens 161 and a convex lens 112. The first incident lens 161 may be a meniscus concave lens. The convex lens 112 may be a double-convex. This first lens group G1-1 has a positive refractive power. However, the protection scope of the present invention is not necessarily limited thereto, and it may be possible when the first lens group G1-1 has negative refractive power. The first lens group G1-1 is fixed when zooming from the wide angle mode to the telephoto mode.

The second lens group G1-2 has negative refractive power. The second lens group G1-2 may be configured of three lenses 121, 122, and 123. Here, the three lenses may be two double-concave lenses 121 and 122 and one positive meniscus lens 123. The second lens group G1-2 moves from the object side to the image side when changing from the wide angle mode to the telephoto mode.

The third lens group G1-3 has a positive refractive power. The third lens 131 may be a meniscus convex lens. The third lens 131 is fixed at the shift from the wide angle mode to the telephoto mode.

The aperture stop ST is positioned between the third lens group G1-3 and the fourth lens group G1-4.

The fourth lens group G1-4 has a positive refractive power. The fourth lens group G1-4 may be configured of three lenses 141, 142, and 143. The three lenses may be two biconvex lenses 141 and 142 and one biconcave lens 143. The fourth lens group G1-4 moves from the image side to the object side when changing from the wide angle mode to the telephoto mode.

The fifth lens group G1-5 has a positive refractive power. The fifth lens group G1-5 may be a meniscus convex lens 151. The fifth lens group G1-5 moves slightly from the image side to the object side when the shift from the wide angle mode to the telephoto mode is performed. Although the fifth lens group G1-5 may perform the auto focusing function, the protection scope of the present invention is not necessarily limited thereto, and the fourth lens group G1-4 may perform the auto focusing function. Do.

The second optical system in the dual lens optical system illustrated in FIGS. 8 to 11 may be configured by three lens groups as illustrated in FIG. 1. For example, the second optical system includes the first lens group G2-1, the second lens group G2-2, and the third lens group G2-3 in the order from the object side to the image axis. do. The second optical system is a short focus optical system.

The first lens group G2-1 of the second optical system may include two meniscus concave lenses 61 and 62 and one meniscus convex lens 31. The second incident lens 61 is a meniscus concave lens at the object side most. The lens 31 on the image side of the first lens group G2-1 of the second optical system is the same as that of the third lens group G1-3 of the first optical system. The first lens group G2-1 of the second optical system has negative refractive power. However, the protection scope of the present invention is not necessarily limited thereto, and it is also possible that the first lens group G2-1 of the second optical system has positive refractive power.

The second lens group G2-2 of the second optical system is the fourth lens group G1-4 of the first optical system. The third lens group G2-3 of the second optical system is the fifth lens group G1-5 of the first optical system. That is, the first optical system and the second optical system share one or more optical elements. One or more shared optical elements will be described later in detail with reference to the embodiments shown in FIGS. 6 to 11.

Although the second optical system is composed of three lens groups G2-1, G2-2, and G2-3, it can be said that the second optical system is composed of four lens groups. In other words, if the second incident lens 61 and the meniscus concave lens 62 are regarded as the first lens group in the second optical system, and the meniscus convex lens 31 is viewed as the second lens group, four lens groups are used. You can also say. In the case of four lens groups, the first lens group may have negative refractive power and the second lens group may have positive refractive power.

Table 1 shows design data of the dual lens optical system illustrated in FIG. 1.

First optical system Second optical system Lens surface R Dn Nd Vd Lens surface R Dn Nd Vd OBJ1 INFINITY INFINITY OBJ2 INFINITY INFINITY S1 61.2649 2.0000 1.957594 22.832500 S1 * 43.0496 1.1000 1.804700 40.953170 S2 13.7438 1.4490 S2 * 4.9324 2.0215 S3 INFINITY 4.0000 1.834001 37.345100 S3 39.839 0.8555 1.503339 79.903600 S4 INFINITY 0.0000 S4 22.6592 10.0234 S5 INFINITY 4.0000 1.834001 37.345100 S6 INFINITY 1.0000 S7 16.2962 2.1525 1.740889 50.745500 S8 * -19.2507 D1 S9 -27.2263 0.5000 1.785610 37.758400 S10 8.7335 1.0000 S11 -14.4598 0.5000 1.496997 81.608400 S12 8.1504 1.3778 2.000600 25.458 S13 20.4376 D2 S14 * 12.6521 1.1334 1.697852 30.353400 S14 12.6521 1.1334 1.697852 30.353400 S15 35.46 1.0000 S15 35.46 1.0000 ST: INFINITY D3 ST: INFINITY D3 S17 * 8.9522 2.9431 1.512122 77.721500 S17 * 8.9522 2.9431 1.512122 77.721500 S18 * -11.7763 1.0170 S18 * -11.7763 1.0170 S19 9.0098 2.0047 1.496997 81.608400 S19 9.0098 2.0047 1.496997 81.608400 S20 -17.6242 0.5000 1.888289 29.145800 S20 -17.6242 0.5000 1.888289 29.145800 S21 7.2792 D4 S21 7.2792 D4 S22 * 9.7849 1.8556 1.531200 56.512700 S22 * 9.7849 1.8556 1.531200 56.512700 S23 * 318.899 S23 * 318.899

Where R is the radius of curvature, Dn is the lens center thickness or the distance between the lens and the lens, Nd is the refractive index, and Vd is the Abbe's number. '*' Mark on the lens surface indicates aspherical surface.

The dual lens optical system according to embodiments of the present invention may include at least one aspherical lens to correct spherical aberration. The definition of the aspherical surface in the embodiments of the present invention is as follows.

The aspherical shape is positive in the x-axis direction toward the image pickup device and the y-axis direction when the direction perpendicular to the optical axis (the direction in which the subject light enters through the incident lens) is the y-axis. It can be expressed as follows.

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, K is the conic constant, A, B, C, D are aspherical coefficients, c represents the inverse of the radius of curvature (1 / R) at the vertex of the lens, respectively.

Table 2 below shows aspherical surface coefficients.

Lens surface K A B C D S1 14.99052300 4.91352000E-04 -1.95070000E-05 2.94047000E-07 -2.45030000E-09 S2 -0.32420800 -1.63929000E-04 1.10196000E-05 -2.15697000E-06 1.25642000E-08 S8 -2.63573300 4.47304000E-05 -3.78725000E-08 -1.06129000E-08 2.71610000E-10 S14 -6.56454800 2.86020000E-04 -1.64149000E-05 2.01429000E-06 -1.46820000E-07 S17 0.10798000 -1.95898000E-04 1.00752000E-05 -5.76614000E-07 2.07411000E-08 S18 -2.67347200 6.84530000E-05 1.09312000E-05 -5.46968000E-07 2.12864000E-08 S22 -1.00000000 2.41023000E-04 8.22609000E-06 -5.00252000E-07 -1.37695000E-08 S23 5266.58534300 3.22176000E-04 -1.25792000E-06 -3.90649000E-07 -2.25821000E-08

The following is data on variable distance at zooming.

Wide angle mode Normal mode Telephoto mode Short throw mode EFL 6.63 12.70 24.71 4.14 2w 60.65˚ 31.62˚ 16.55˚ 86.47˚ Fno 3.77 4.54 5.02 3.27 D1 1.00000 4.93511 8.99989 D2 9.00000 5.06520 1.00020 D3 7.60200 3.45650 1.00000 11.33750 D4 9.16370 12.27990 13.46560 1.11260

EFL is the combined focal length of the entire lens system, Fno is the F number, 2w is the angle of view, D1 is the distance between the first and second lens groups, and D2 is the distance between the second and third lens groups. D3 denotes an interval between the third lens group and the fourth lens group G4, and D4 denotes an interval between the fourth lens group G4 and the fifth lens group.

2 to 5 show spherical aberration, astigmatic field curves, and distortion in the wide-angle mode, normal mode, telephoto mode, and short focus mode of the dual lens optical system shown in FIG. 1, respectively.

Hereinafter, a specific embodiment to which the dual lens optical system shown in FIG. 1 is applied will be described.

First, FIG. 6 is a diagram illustrating a state in a first optical mode of a dual lens optical system according to an exemplary embodiment of the present invention.

In this embodiment, the first optical system and the second optical system share all the optical elements except the incident lenses 161 and 111. That is, the first optical system and the second optical system include the first reflecting member 115, the biconvex lens 112, and the second to fifth lens groups G2, G3, G4, and G5 of the first lens group G1. ) And the imaging device 1 are shared. Therefore, the first optical system and the second optical system are zoom optical systems.

In the first optical mode, the first optical system refracts the object light OBJ1, which enters through the first incident lens 161 in one direction, by 90 ° from the first reflecting member 115 to the imaging device 1. . For example, in a digital camera or camera phone, the first optical mode may be used when the photographer photographs another object using the first optical system.

In contrast, the second optical mode illustrated in FIG. 7 may be used when the photographer self-photographs himself or makes a video call using the second optical system. This is because the second optical system can photograph the subject light OBJ2 coming through the second incident lens 111 in the opposite direction.

In this embodiment, the switching between the first optical mode and the second optical mode is made by the rotation of the first reflective member. For example, when the reflective surface (first surface) of the first reflective member faces the first incident lens 161 (first position) as shown in FIG. 6, the subject light OBJ1 in one direction While facing the image pickup device 1, the subject light OBJ2 in the opposite direction is blocked by the second surface of the first reflecting member.

The description of the lens group and its movement in the wide-angle mode, the normal mode, and the telephoto mode in the first optical system and the second optical system is the same as that in the wide-angle mode, the normal mode, and the telephoto mode in FIG. .

8 is a graph illustrating a dual lens optical system 200 according to another exemplary embodiment of the present invention.

In this embodiment, the first optical system and the second optical system share the third to fifth lens groups G1-3, G1-4, and G1-5 and the imaging device 1 of the first optical system.

In the first optical mode, the first optical system refracts the object light OBJ1, which enters through the first incident lens 211 in one direction, by 90 ° from the first reflecting member 250 to the imaging device 1. The second optical system blocks the object light OBJ2 from the opposite direction with the lens cover (not shown). For example, in a digital camera or camera phone, the first optical mode may be used when the photographer photographs another object using the first optical system. Since the first optical system includes the second lens group and the fourth lens group G1-2, G1-3, and G1-4, which are zoom lens groups, the first optical system is a zoom optical system.

The second optical system includes a first lens group G2-1, a second lens group G2-2, and a third lens group G2-3. The second lens group G2-2 and the third lens group G2-3 of the second optical system are shared with the first optical system. The meniscus convex lens 263 of the first lens group G2-1 of the second optical system is also shared with the first optical system. In the middle of the first lens group G2-1 of the second optical system, the second reflecting member 260 is disposed to be rotatable.

When the second reflective member 260 rotates 45 °, the second reflective member 260 is switched from the first optical mode to the second optical mode. In the second optical mode, the object light OBJ2 entering through the second incident lens 261 is refracted by 90 ° by the second reflecting member 260 to be directed toward the image pickup device 1, while the first incident lens ( The subject light OBJ1 introduced through 211 is blocked by the second reflecting member 260. Therefore, in the second optical mode, it can be used when the photographer directly photographs himself while watching the image.

9 is a diagram illustrating a dual lens optical system 300 according to another exemplary embodiment of the present invention.

This embodiment differs from the embodiment shown in FIG. 8 in that the position of the second reflecting member 260 is close to the second incident lens 261. In the first optical mode, the second reflecting member 260 does not need to have a separate lens cover because it blocks the object light OBJ2 coming from the opposite direction.

10 illustrates a dual lens optical system 400 according to another embodiment of the present invention.

This embodiment differs from the embodiment shown in FIG. 8 in that the object lights OBJ1 and OBJ2 entering the first incident lens 211 and the second incident lens 261 are in the same direction. The first optical system is a zoom optical system, and the second optical system is a short focus optical system. The focal length of the short focus optical system of the second optical system is an ultra wide angle mode that is shorter than the focal length in the wide angle mode of the first optical system. Therefore, there is an advantage that can secure a wide range of focal length even in a camera that is becoming more compact.

11 is a diagram illustrating a dual lens optical system 500 according to another exemplary embodiment of the present invention.

This embodiment differs from the embodiment shown in FIG. 8 in that the position of the second reflecting member 260 is close to the second incident lens 261. In the first optical mode, the second reflecting member 260 does not need to have a separate lens cover because it blocks the object light OBJ2 coming from the opposite direction.

Although the reflective mirror is illustrated as the second reflective member in the dual lens optical system illustrated in FIGS. 8 to 11, the protection scope of the present invention is not necessarily limited thereto. For example, a prism movable between the first position and the second position may be used as the second reflective member 260.

The imaging device 1 receives light representing an image of a subject and converts the light into an electrical signal for each pixel, and may employ a CCD (charge coupled device) or a complementary metal oxide semiconductor (CMOS).

The lens configuration constituting the first to fifth lens groups described so far is exemplary, and it should be understood that those skilled in the art can appropriately change the number or type of lenses in consideration of optical performance or aberration within the claims of the present invention. something to do.

The dual lens optical system 100, 200, 300, 400, and 500 described so far may be employed as a digital camera module in a digital camera or a mobile communication device. The mobile communication device may be, for example, a camera phone.

12 is a diagram schematically showing the configuration of a mobile communication device 1000 employing a digital camera module according to an embodiment of the present invention.

The mobile communication device 1000 according to the embodiment of the present invention includes a digital camera module according to the embodiment of the present invention. The digital camera module includes not only a dual lens optical system according to embodiments of the present invention but also a driving unit (not shown) for moving the reflective member to have a configuration corresponding to the selected optical mode. The mobile communication device 1000 includes a mode selection unit (not shown) for selecting any one of the first optical mode and the second optical mode, and an image processing unit for calculating and displaying an electrical signal from the image pickup device 1 as an image signal ( Not shown) may be provided. The mode selection may be made by input through the button unit 1600, for example. The image processed and displayed by the image processor is displayed for the user to view through the screen 1400.

The cover glass 1200 may be installed on the inner surface of the mobile communication device 1000, that is, the surface where the screen 1400 is visible. When the dual lens optical system of any of the embodiments described with reference to FIGS. 1 to 10 is provided inside the mobile communication device 1000, light representing the image of the subject is incident on the dual lens optical system through the cover glass 1200. do. In addition, although not shown in the drawing, a rear cover glass may be provided on the outer surface of the mobile communication device 1000, that is, the rear surface of the screen 1400. Since the dual lens optical system illustrated in FIGS. 8 to 10 can selectively photograph an image of any one of the subjects placed in opposite directions without moving the imaging optical system as a whole, the user may be on the opposite side to the screen 1400. It is possible to selectively photograph the subject light OBJ1 and OBJ2 in the state where the screen 1400 is viewed.

The mobile communication device 1000 of the present invention may be applied to, for example, a mobile communication device capable of making video calls and taking pictures while having one camera module. That is, in the video call mode or the self-shooting mode, the user may be photographed at a position where the user views the image of the other party or the user's image displayed on the screen 1400 by selecting the first optical mode. The user may take a picture while viewing an image of another subject displayed on the screen 1400.

 Such an imaging optical system of the present invention and a mobile communication device employing the same have been described with reference to the embodiments illustrated in the drawings for clarity of understanding, but these are merely exemplary, and those skilled in the art may variously modify and It will be appreciated that other equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

FIG. 1 schematically illustrates a dual lens optical system according to embodiments of the present invention in a wide angle mode, an intermediate mode, a telephoto mode, and a short focus mode for simulation.

FIG. 2 is a graph illustrating aberration diagrams in the wide-angle mode of the dual lens optical system illustrated in FIG. 1.

FIG. 3 is a graph illustrating aberration diagrams in an intermediate mode of the dual lens optical system illustrated in FIG. 1.

FIG. 4 is a graph illustrating aberration diagrams in a telephoto mode of the dual lens optical system illustrated in FIG. 1.

FIG. 5 is a graph illustrating aberration diagrams in the short focus mode of the dual lens optical system illustrated in FIG. 1.

6 is a diagram illustrating a dual lens optical system according to an exemplary embodiment of the present invention in a first optical mode.

FIG. 7 illustrates a dual lens optical system according to an exemplary embodiment of the present invention in a second optical mode.

8 is a diagram illustrating a dual lens optical system according to another exemplary embodiment of the present invention.

9 is a diagram illustrating a dual lens optical system according to another exemplary embodiment of the present invention.

10 is a diagram illustrating a dual lens optical system according to another exemplary embodiment of the present invention.

11 is a diagram illustrating a dual lens optical system according to another exemplary embodiment of the present invention.

12 is a diagram schematically illustrating a configuration of a mobile communication device employing a digital camera module according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: Image pickup device 111, 211: Second incident lens

115, 250: First reflection member 161, 211: First incident lens

260: second reflecting member G1, G1-1: first optical system first lens group

G2, G1-2: 1st optical system 2nd lens group G3, G1-3: 3rd lens group of 1st optical system

G4, G1-4: Fourth lens group of first optical system G5, G1-5: Fifth lens group of first optical system

G2-1: Second lens group first lens group G2-2: Second lens group second optical system

G2-3: second optical system third lens group

Claims (16)

A dual lens optical system having a first optical system and a second optical system provided with at least one reflecting member for selectively refracting optical axes from the first direction and the second direction toward the imaging device, The first optical system includes a first lens group including a first reflecting member, a second lens group having negative refractive power, and a positive refractive power in an order from an object side to an image side along an optical axis from the first direction. A third lens group, a fourth lens group having positive refractive power, and a fifth lens group having positive refractive power, And the second optical system shares at least one optical element with the first optical system. According to claim 1, The first lens group has a dual refractive optical system. According to claim 1, When changing from the wide angle mode to the telephoto mode, the first lens group and the third lens group are fixed, the second lens group moves to the image side, and the fourth lens group and the fifth lens group move to the object side. Dual lens optical system. According to claim 1, The at least one optical element may include at least one optical element of the first lens group, the second lens group, the third lens group, the fourth lens group, the fifth lens group, and the first optical system. And an optical axis from the second direction in the second optical system is refracted by the first reflecting member and directed toward the image pickup device. 5. The method of claim 4, The first reflecting member has a first surface and a second surface facing each other, the first direction and the second direction is the opposite direction on the same axis, In the first reflection member, in the first position, the optical axis from the first direction is refracted by the first surface toward the image pickup device, and the optical axis from the second direction is blocked by the second surface. In the second position, the first position and the second position such that the optical axis from the second direction is refracted by the first surface toward the image pickup device and the optical axis from the first direction is blocked by the second surface. Dual lens optics that can move between. According to claim 1, And the second optical system includes a second reflecting member that deflects the optical axis from the second direction and directs the optical axis toward the image pickup device. The method according to claim 6, The at least one optical element is the third lens group, the fourth lens group, the fifth lens group, and the imaging device of the first optical system, and the second optical system refracts an optical axis from the second direction, Dual lens optical system comprising a second reflecting member directed to the image pickup device. 8. The method of claim 7, The second optical system includes a first lens group including the second reflecting member and the third lens group in the first optical system in an order from an object side to an image side along an optical axis from the second direction. A dual lens optical system comprising a second lens group having a refractive power and a third lens group having a positive refractive power. The method of claim 8, The first lens group has a negative refractive power dual lens optical system. The method of claim 8, And the first direction and the second direction are directions opposite to each other on a non-identical axis. The method of claim 8, The first lens and the first direction are dual lens optical systems in the same direction on each other on the same axis. The method of claim 8, And the second reflecting member is selectively moved between a third position and a fourth position so that subject light incident in the second direction is formed in the image pickup device. 13. The method of claim 12, Further comprising a lens cover movably disposed in front of the first lens group of the two optical system, In the first position, the subject light incident in the second direction is blocked by the lens cover, and the subject light incident in the first direction forms the image pickup device, whereas in the second position, the subject light incident in the second direction Dual-lens optical system that the light is refracted by the first surface of the second reflecting member to form the image pickup device and the subject light incident in the first direction is blocked by the second surface of the second reflecting member. 13. The method of claim 12, In the first position, the subject light incident in the second direction is blocked by the second reflecting member, and the subject light incident in the first direction forms the image pickup device, while in the second position, the subject light is incident in the second direction. And the subject light is refracted by the first surface of the second reflecting member to form the image pickup device, and the subject light incident in the first direction is blocked by the second surface of the second reflecting member. According to claim 1, The first optical system and the second optical system share at least a lens group for auto focus (AF). 16. A digital camera module comprising the first optical system and the second optical system of any one of claims 1 to 15, wherein the first optical system is used in a normal photographing mode and the second optical system is used in a self photographing or video call mode. .

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