KR20110099983A - Compact lens optical system and digital camera module comprising the same - Google Patents

Abstract

According to the present invention, in order to achieve miniaturization while still image capturing and moving image capturing, the optical axis of light representing the image of the subject from the first direction may be refracted by (i) the image pickup device and (ii) the first reflecting member. A first optical system directed toward the image pickup device, and (iii) a second reflecting member to refract the optical axis of light representing the image of the subject from the second direction to direct the optical axis to the image pickup device, the at least one of the first optical system And a second optical system for sharing an optical element of the first optical system, wherein the first optical system and the second optical system selectively direct light representing an image of a subject from the first direction or the second direction to the imaging device, The first region on the image pickup surface where the light representing the image of the subject incident through the first optical system is formed and the image of the subject incident through the second optical system A second area on the image sensing plane of light indicating temperature may cause problems provides a dual-lens optical system and a digital camera module having the same each other, they are overlapped with each other while having a different size.

Description

Compact Lens Optical System and Digital Camera Module Comprising the Same

The present invention relates to a micro lens optical system and a digital camera module having the same, and more particularly, to a micro lens optical system suitable for a micro digital camera and a mobile communication device and a digital camera module having the same.

As technology advances and consumer demands increase, digital camera modules are required to have various functions while being miniaturized. In particular, with the convergence of digital technology, general digital still cameras and camera phones are additionally equipped with a function of capturing a video that a camcorder used to perform in the past. Recently, a mobile communication device such as a camera phone capable of video calling and taking pictures by combining a wireless Internet communication function and a digital camera function has emerged.

Conventional communication electronics used different optical systems for shooting still images and video. Therefore, there are many difficulties in reducing the material cost and miniaturizing the system by configuring the system to move the imaging device to each optical system configured or by configuring the system by increasing the number of imaging devices.

An object of the present invention is to provide a miniature dual lens optical system that can be miniaturized while having two lens optical systems configured to capture still images and moving images, and a digital camera module having the same.

According to one aspect of the invention, (i) the image pickup device, (ii) a first optical system having a first reflecting member and refracting the optical axis of the light representing the image of the subject from the first direction to direct to the image pickup device, and (iii) a second optical system having a second reflecting member, refracting an optical axis of light representing an image of a subject from a second direction to be directed to the image pickup device, and sharing a second optical system sharing at least one optical element of the first optical system; And the first optical system and the second optical system selectively direct the light representing the image of the subject from the first direction or the second direction to the image pickup device, and the image of the subject incident through the first optical system. The first region on the imaging surface on which the light representing the image is formed and the second region on the imaging surface on which the light representing the image of the subject incident through the second optical system are bound. Dual lens optics having different sizes and overlapping each other are disclosed.

The second reflective member is selectively moved to a first position or a second position so that light representing an image of the subject from the first direction or the second direction is selectively directed to the image pickup device.

The second reflective member may be a right-angle prism having a reflective surface and an incident side surface is an aspherical surface. In this case, the second reflecting member is disposed closest to the object side in the second optical system to serve as an incident lens. An opposite side of the reflecting surface of the second reflecting member may be a mirror coating to reflect light coming from the opposite side.

Alternatively, the second reflecting member may be a movable reflecting mirror on the reflecting surface. In this case, an aspherical lens may be further disposed on the object side in the second direction of the movable reflective mirror.

The reflective surface of the second reflective member may be smaller than the reflective surface of the first reflective member.

The second region is completely surrounded by the first region.

The first optical lens group includes a first lens group including a first reflecting member for refraction of an optical path of light representing a subject from a first direction and directed to an image pickup device in an order from an object side to an image side along an optical axis. A second lens group having refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power may be provided.

The first optical system is a zoom optical system, and when shifting from the wide angle mode to the telephoto mode, the second lens group moves to the image pickup device side and then to the object side, and the third lens group moves to the object side, The fourth lens group may move toward the image pickup device, and the fourth lens group may perform focusing.

The second optical system includes: a first lens group including a second reflecting member that refractes an optical path of light representing a subject from a second direction and directs it to an image pickup device in an order from an object side to an image side along an optical axis; A second lens group having refractive power and a third lens group having positive refractive power may be provided.

The sharing optical element is a third and fourth lens group of the first optical system, and the third lens group and the fourth lens group of the first optical system are the second lens group and the second lens of the second optical system, respectively. It may be a third lens group.

The second optical system may be a short focus optical system, and a focal length of the second optical system may be longer than a focal length in the wide angle mode of the first optical system and shorter than a focal length in the normal mode of the first optical system.

The second optical system may be mainly used for video shooting.

The first direction and the second direction may face directions opposite to each other on a non-identical axis.

In contrast, the first direction and the second direction may face the same direction on the same axis.

A cover may be disposed on the object side of the first reflective member to selectively block light incident from the first direction.

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 still image photographing mode and the second optical system is used in a moving image photographing mode.

Each lens is equipped with two lens optics configured to capture still images and moving images, while miniaturization and cost reduction are possible. In addition, the size of video data captured by the video is small, allowing for rapid processing and transmission.

1 schematically illustrates a dual lens optical system according to an exemplary embodiment of the present invention in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode.
2 schematically illustrates a dual lens optical system according to another exemplary embodiment of the present invention in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode.
Figure 3 schematically shows a dual lens optical system according to another embodiment of the present invention in wide-angle mode, normal mode, telephoto mode and short focus mode.
4 is a view illustrating an optical path in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode of the lens optical system illustrated in FIG. 1.
FIG. 5 is a graph illustrating aberration diagrams in the wide-angle mode of the dual lens optical system illustrated in FIG. 4.
FIG. 6 is a graph illustrating aberration diagrams in a normal mode of the dual lens optical system illustrated in FIG. 4.
FIG. 7 is a graph illustrating aberration diagrams in a telephoto mode of the dual lens optical system illustrated in FIG. 4.
FIG. 8 is a graph illustrating aberration diagrams in the short focus mode of the dual lens optical system illustrated in FIG. 4.
9 schematically illustrates a dual lens optical system according to another embodiment of the present invention in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode.
10 schematically illustrates a dual lens optical system according to another embodiment of the present invention in wide-angle mode, normal mode, telephoto mode, and short focus mode.
FIG. 11 is a view schematically illustrating a movable reflection mirror of the dual lens optical system illustrated in FIG. 10.
FIG. 12 is a view illustrating a second area on an image pickup surface to which light representing an image of a subject when taken with the second optical system of the dual lens optical system according to the exemplary embodiments of the present invention is formed.
FIG. 13 is a diagram illustrating a first area on an image pickup surface to which light representing an image of a subject when taken with the first optical system of the dual lens optical system according to exemplary embodiments of the present invention is formed.
14 is a diagram schematically illustrating a configuration of a copper communication device employing a digital camera module according to an embodiment of the present invention.

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.

1 schematically illustrates a dual lens optical system according to an exemplary embodiment of the present invention in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode.

The dual lens optical system according to this embodiment includes a first optical system and a second optical system. The first optical system may be a zoom lens optical system having a wide mode, a normal mode, and a tele mode, respectively. The second optical system may be a short focus optical system having a focal length between the normal mode and the telephoto mode in the first optical system.

The first optical system in this embodiment includes the first lens group G1-1, the second lens group G1-2, the third lens group G1-3, and the order from the object side to the image axis. Fourth lens group G1-4 is provided.

The first lens group G1-1 may include a meniscus concave lens (negative meniscus) that is an incident lens 11, a first reflecting member 12, and a meniscus convex lens (positive meniscus) 13. have. The first reflecting member 12 deflects the optical path of the light representing the subject from the first direction by 90 ° to be directed to the image pickup device 51. Although the first reflective member 12 is shown as a right prism in FIG. 1, the movable reflective mirror may be alternatively illustrated in FIGS. 3 and 10.

In this embodiment, the first lens group G1-1 has negative refractive power. However, the first lens group G1-1 may have a small power and may have a positive refractive power or a 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 composed of two lenses 21 and 22. Here, the two lenses may be one double-concave lens 21 and one meniscus convex lens 22. The second lens group G1-2 moves to the image pickup device side and shifts to the object side again when changing from the wide angle mode to the telephoto mode.

The aperture stop ST is positioned between the second lens group G1-2 and the third lens group G1-3.

The third lens group G1-3 has a positive refractive power. The third lens group G1-3 may be configured of three lenses 31, 32, and 33. The three lenses may be two first and second double-concave lenses 31 and 32 and one biconvex lens 33. The second biconvex lens 32 and the biconcave lens 33 are composed of a bonded lens, which is easy to remove chromatic aberration. The third lens group G1-3 moves toward the object side when changing from the wide angle mode to the telephoto mode. Both surfaces of the first biconvex lens 31 are aspherical. This minimizes spherical aberration.

The fourth lens group G1-4 has a positive refractive power. The fourth lens group G1-4 may be a biconvex lens 41. One surface S19 of the biconvex lens 41 is an aspherical surface. The fourth lens group G1-4 slightly moves from the object side to the image pickup device side in the shift from the wide angle mode to the telephoto mode. The fourth lens group G1-4 may perform an auto focusing function. By setting the refractive power of the lens group closest to the image pickup device side and arranging the aspherical surface, the telecentric required in a solid-state image pickup device such as a CCD is enabled. That is, the incidence angle of the light source incident on the periphery of the imaging surface can be configured to be incident close to the perpendicular to the imaging surface.

The first optical system minimizes the entire length of the entire optical system by the first to fourth lens groups G1-1, G1-2, G1-3, and G1-4 described above, and reduces each lens when zooming. It is advantageous to downsizing the optical system by reducing the amount of movement of the group.

Table 1 shows design data of the first optical system of the embodiment shown in FIG.

Lens surface R D Nd Vd OBJ INFINITY INFINITY S1 121.031 0.6 1.92286 20.88 S2 13.468 1.24 S3 INFINITY 3.54 1.83400 37.35 S4 INFINITY 0 S5 INFINITY 3.54 1.83400 37.35 S6 INFINITY 0.1 S7 14.021 1.42 1.90366 31.32 S8 48.828 D0 S9 -26.574 0.5 1.49700 81.61 S10 7.849 1.15 1.92286 20.88 S11 10.795 D1 ST: INFINITY 0.2 S13 * 6.943 1.09 1.82080 42.71 S14 * -47.885 1.05 S15 8.965 1.4 1.80420 46.50 S16 -8.202 0.4 1.78472 25.72 S17 4.07 D2 S18 1116.49761 1.5 1.76802 49.24 S19 * -11.635 D3 S20 INFINITY 0.5 1.51680 64.20 S21 INFINITY

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

The second optical system is composed of three lens groups. 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 side. . The second optical system is a short focus optical system.

The first lens group G2-1 of the second optical system is the second reflecting member 61. In this embodiment, the second reflecting member is a right angle prism 61. The orthogonal prism 61 is provided with a reflecting surface therein, and refracts the object light OBJ2 incident from the second direction toward the image pickup device 52. The object side surface 61a of this rectangular prism 61 is an aspherical surface having negative refractive power. Therefore, a separate incident lens for the second optical system is unnecessary, contributing to the miniaturization of the optical system. In addition, the aspherical rectangular prism 61 is advantageous in correcting spherical aberration and astigmatism.

In this embodiment, the reflecting surface of the second reflecting member 61 faces the same direction as the reflecting surface of the first reflecting member 12. That is, the second optical system, which is a short focus optical system, is used to photograph a subject in the same direction as the first optical system.

The second reflecting member 61 selectively deflects the optical axis of the subject light from the second direction and directs it to the image pickup device 52. For example, when the second reflecting member 61 is moved to be disposed between the first lens group G1-2 and the third lens group G1-3 (first position) of the first optical system, the second direction is moved. While the object light OBJ2 incident from the light enters the image pickup device 52, when the second reflecting member 61 is moved to be disposed (second position) away from the first optical system, the object light OBJ1 incident from the first direction ) Is attached to the imaging device 52.

In the second optical mode in which the second optical system is used for photographing, the incident lens 11 of the first optical system is shielded by the cover 5. Therefore, the object light from the first direction is prevented from entering the image pickup device 52.

Meanwhile, as shown in FIG. 3, a mirror coating is applied to the opposite side 261b of the reflective surface of the rectangular prism, which is the second reflective member, to prevent the subject light incident from the first direction from traveling to the image pickup device 52. You may. In this case, it is not necessary to separately provide the cover 5 used in the embodiment of Fig. 1, which is more advantageous for miniaturization.

The second lens group G2-2 of the second optical system is the third lens group G1-3 of the first optical system. The third lens group G2-3 of the second optical system is the fourth lens group G1-4 of the first optical system. That is, the first optical system and the second optical system share two lens groups G1-3 and G1-4 and the imaging device 52. Therefore, it contributes to the miniaturization of the entire dual lens.

Table 2 shows design data of the second optical system of the embodiment shown in FIG. 4.

Lens surface R D Nd Vd OBJ INFINITY S1 * -34.154 4.3 S2 INFINITY 5 - - - STOP INFINITY 0.2 S13 * 6.943 1.09 1.82080 42.71 S14 * -47.885 1.05 S15 8.965 1.4 1.80420 46.50 S16 -8.202 0.4 1.78472 25.72 S17 4.07 2.55 S18 1116.49761 1.5 1.76802 49.24 S19 * -11.635 3.59 S20 INFINITY 0.5 1.51680 64.20 S21 INFINITY

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

As can be seen from FIGS. 4, 12 and 13, the first optical system uses the first region IMG 1 of the imaging surface of the imaging device 52. That is, the subject light from the first direction incident through the first optical system is formed in the first region of the imaging surface. On the other hand, the second optical system uses the second region IMG 2 of the imaging surface of the imaging device 52. That is, the subject light from the second direction incident through the second optical system is formed in the second area of the imaging surface. At this time, the second region is overlapped to be completely included in the first region and has a smaller size. This means that the second optical system uses only a part of the image pickup device as compared to the first optical system, and therefore the moving image and / or still image captured by the second optical system has a smaller number of pixels than the still image captured by the first optical system.

As such, the moving picture having a much larger amount of data than the still picture is shot to have a smaller number of pixels, thereby increasing the image processing speed and reducing the lens optical system as a whole.

The lens optical system illustrated in FIG. 4 may include at least one aspherical lens to correct spherical aberration. The definition of aspherical surface here 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.

[Equation 1]

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 reciprocal of the radius of curvature (1 / R) at the vertex of a lens, respectively.

Table 3 below shows aspherical surface coefficients in the dual lens optical system according to the exemplary embodiment illustrated in FIG. 4.

Lens surface K A B C D S1 2.606380 -4.284578E-05 1.861698E-06 -7.282206E-08 1.079240E-09 S13 -0.921137 0.000000E + 00 0.000000E + 00 0.000000E + 00 0.000000E + 00 S14 -96.961440 4.521647E-05 0.000000E + 00 0.000000E + 00 0.000000E + 00 S19 1.902910 4.843139E-04 -1.986718E-06 0.000000E + 00 0.000000E + 00

Table 4 below shows data on the variable distance during zooming in the lens optical system according to the exemplary embodiment illustrated in FIG. 1.

Wide angle mode Normal mode Telephoto Mode Single focus mode EFL 7.00 11.55 19.95 8.99 2ω 56.52 33.78 20.02 37.96 Fno 3.12 4.25 6.24 2.48 D0 1.825 2.901 0.964 - D1 10.225 4.867 1.036 - D2 5.45 10.987 18.461 - D3 3.861 2.605 0.898 -

EFL is the combined focal length of the entire lens optical system, Fno is the F number, 2w is the full angle of view, and D1 is the distance between the first lens group G1-1 and the second lens group G1-2. D2 is the distance between the second lens group G1-2 and the third lens group G1-3, and D3 is the distance between the third lens group G1-3 and the fourth lens group G1-4. D4 denotes the interval between the fourth lens group G1-4 and the infrared filter 51.

2 and 3 schematically illustrate a dual lens optical system according to other embodiments of the present invention in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode.

The difference between these embodiments and the embodiment of FIG. 1 is the direction of the subject light photographed by the first optical system and the second optical system. 2 and 3, the second direction, which is the direction of the subject light incident on the second optical system, is opposite to the first direction, which is the direction of the subject light incident on the first optical system.

In the digital camera or camera phone employing the dual lens optical system according to the embodiments of FIGS. 2 and 3, the first optical mode may be used when the photographer photographs another object using the first optical system. On the other hand, in the second optical mode in which the second optical system is used, the photographer may directly photograph themselves as a still image, or may be used to capture a video for video call.

In this embodiment, the switching between the first optical mode and the second optical mode is made by the movement of the second reflecting member 61. For example, in the second optical mode, the second reflective member 61 is positioned between the first position (the second lens group G11-2 and G21-2 and the third lens group G11-3 and G21-3). ) And the subject light OBJ2 is directed to the image pickup elements 152 and 252, while in the first optical mode the second reflecting members 161 and 261 are moved to the second position and from the opposite direction in the first direction. The subject light OBJ1 is refracted by the first reflecting member 12 and directed to the image pickup device 52.

The second reflecting members 161 and 261 which are orthogonal prisms may switch between the first optical mode and the second optical mode by moving linearly between the first and second positions, or alternatively, by rotating by the pivot axis. It is also possible to switch between the first optical mode and the second optical mode.

In addition, the second optical system mainly used for video shooting, such as shooting in a video call, shares the image pickup device 51 used by the first optical system, and uses only a part of the image pickup device (IMG 2) to obtain a relatively low pixel. Create and process image data quickly. Therefore, it is not only advantageous for miniaturization of the dual lens optical system, but also suitable for video shooting and video telephony with a large amount of data to be transmitted.

5 to 8 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. 4, respectively.

In the wide-angle mode of FIG. 5, the distortion aberration increases toward the outside of the image, but this is not a big problem since it can be corrected to some extent in an operation processing apparatus such as a digital signal processor (DSP).

Referring to the aberration diagram in the short focus mode of FIG. 8, it can be seen that in the second optical system, an area of one side of the image formed on the imaging surface of the image pickup device uses 1.5 mm, which is much smaller than 3.5 mm in the first optical system. .

FIG. 9 schematically illustrates a lens optical system according to another embodiment of the present invention in a wide angle mode, a normal mode, a telephoto mode, and a short focus mode.

Compared with the embodiment shown in FIG. 2, the embodiment shown in FIG. 9 is different in that the size of the second reflecting member 361 is small. This is possible because the area IMG 2 in which the subject light from the second direction transmitted through the second optical system and formed on the imaging device 352 forms on the imaging surface is small. That is, the size of the right angle prism 361 that is the second reflecting member can be made smaller than that of the first reflecting member 312, which is advantageous for miniaturization of the dual lens optical system.

10 schematically illustrates a dual lens optical system according to another embodiment of the present invention in wide-angle mode, normal mode, telephoto mode, and short focus mode.

Compared with the embodiment shown in FIG. 2, the embodiment shown in FIG. 10 differs in that the second reflecting member 461 is a movable reflective mirror rather than a right angle prism. When the movable reflection mirror 461 is in the second position, light from the second direction is blocked so that the object light OBJ1 entering through the first optical system is formed on the image pickup device 452. On the other hand, when the movable reflection mirror 461 is in the first position, the object light OBJ2 from the second direction is condensed on the image pickup device 452. A stopper 463 may be further provided to ensure that the movable reflective mirror 461 is correctly positioned in the first position.

FIG. 11 shows one surface of the second reflective side of the movable reflection mirror of the dual lens optical system illustrated in FIG. 10. A reflective surface 461a is formed in one region of the movable reflective mirror surface, and an absorbing surface 461b is formed in other regions. The absorbing surface 461b may be in the form of a black material coated.

12 and 13 are views illustrating a second region and a first region on an image pickup surface to which subject light is captured when the second and first optical systems of the dual lens optical system according to the exemplary embodiments of the present invention are photographed, respectively.

As described above, since the entire pixel area IMG 1 of the imaging surface 1 is used when photographing with the first optical system, a high pixel image can be obtained, while some pixels of the imaging surface 1 are photographed with the second optical system. Since only the area IMG 2 is used, a relatively low pixel image is obtained. Therefore, the second optical system can improve the image processing speed, thereby making it suitable for, for example, video shooting for video telephony.

In the above-described embodiments, the imaging devices 52, 152, 252, 352, and 452 receive subject light and convert the pixel into an electrical signal for each pixel. It can be adopted. Infrared filters 51, 151, 251, 351, and 451 may be disposed in front of the imaging devices 52, 152, 252, 352, and 452.

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

The lens optical systems 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.

14 is a diagram schematically illustrating a 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 a driving unit (not shown) for operating the second reflecting members 61, 161, 261, 361, and 461 to have a configuration corresponding to the selected optical mode as well as the dual lens optical system according to the embodiments of the present disclosure. It is provided. The mobile communication device 1000 includes an electrical signal from a mode selection unit (not shown) and an image pickup device (52, 152, 252, 352, 452) for selecting either the first optical mode or the second optical mode. An image processing unit (not shown) for calculating and displaying a 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. 2, 3, 9, and 10 is provided inside the mobile communication device 1000, the light indicating the image of the subject through the cover glass 1200 is dual lens. Incident to the optical system. 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. 2, 3, 9, and 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 can select an image on the screen 1400. With respect to the subject lights OBJ1 and OBJ2 located opposite to each other, it is possible to selectively photograph with the view of the screen 1400.

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's image may be captured by selecting the first optical mode at a position where the user views the image of the other party or the image OBJ2 displayed through the screen 1400. In the shooting mode, the user may take a picture while viewing an image of another subject OBJ1 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.

52, 152, 252, 352, 452: imaging device
11, 111, 211, 311, and 411: first incident lens
12, 112, 212, 312, and 412: first reflective member
61, 161, 261, 361, 461: second reflecting member
G1-1, G11-1, G21-1: first lens group of first optical system
G1-2, G11-2. G21-2: second lens group of first optical system
G1-3, G11-3. G21-3: third lens group of first optical system
G1-4, G11-4. G21-4: fourth lens group of the first optical system
G2-1, G12-1, G22-1: first lens group of second optical system
G2-2, G12-2, G22-2: 2nd lens group of a 2nd optical system
G2-3, G12-3, G22-3: third lens group of second optical system

Claims (18)

Imaging device;
A first optical system having a first reflecting member and refracting an optical axis of light representing an image of a subject from a first direction and directing the optical axis toward the image pickup device; And
And a second optical system having a second reflecting member, refracting an optical axis of light representing an image of a subject from a second direction, and directing the optical axis to the image pickup device, wherein the second optical system shares at least one optical element of the first optical system.
The first optical system and the second optical system selectively directs the light representing the image of the subject from the first direction or the second direction to the imaging device,
The first region on the imaging surface on which the light representing the image of the subject incident through the first optical system is formed and the second region on the imaging surface on which the light representing the image of the subject incident through the second optical system are formed have different sizes. Dual lens optics overlap each other. The method according to claim 1,
And the second reflecting member is configured to selectively move to a first position or a second position such that light representing an image of the subject from the first direction or the second direction is selectively directed to the image pickup device. The method of claim 2,
The second reflecting member is a dual lens optical system having a reflecting surface and the incidence side surface is an aspherical prism. The method of claim 3,
And the second reflecting member is disposed closest to the object side in the second optical system and serves as an incident lens. The method of claim 3,
The opposite side of the reflective surface of the second reflective member is a dual lens optical system having a mirror coating to reflect the light coming from the opposite side. The method of claim 2,
And the second reflecting member is a movable reflecting mirror on a reflecting surface, and an aspheric lens is further disposed on an object side in the second direction of the movable reflecting mirror. The method according to claim 3 or 6,
The dual lens optical system of the second reflecting member is smaller than the reflecting surface of the first reflecting member. The method according to claim 1,
And the second region is completely surrounded by the first region. The method according to claim 1,
The first optical lens group includes a first lens group including a first reflecting member for refraction of an optical path of light representing a subject from a first direction and directed to an image pickup device in an order from an object side to an image side along an optical axis. A dual lens optical system comprising a second lens group having refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. 10. The method of claim 9,
The first optical system is a zoom optical system, and when shifting from the wide angle mode to the telephoto mode, the second lens group moves to the image pickup device side and then to the object side, and the third lens group moves to the object side, And a fourth lens group moves toward the image pickup device, and the fourth lens group performs focusing. 10. The method of claim 9,
The second optical system includes: a first lens group including a second reflecting member that refractes an optical path of light representing a subject from a second direction and directs it to an image pickup device in an order from an object side to an image side along an optical axis; A dual lens optical system comprising a second lens group having refractive power and a third lens group having positive refractive power. The method of claim 11, wherein
The sharing optical element is a third and fourth lens group of the first optical system, and the third lens group and the fourth lens group of the first optical system are the second lens group and the second lens of the second optical system, respectively. Dual lens optical system that is the third lens group. The method of claim 10,
The second optical system is a short focus optical system, the focal length of the second optical system is longer than the focal length in the wide-angle mode of the first optical system and shorter than the focal length in the normal mode of the first optical system. The method according to claim 1,
The second optical system is a dual lens optical system used for moving picture and / or still image shooting. The method according to claim 1,
The first lens and the second direction are dual lens optical systems facing opposite directions on the same axis. The method according to claim 1,
The dual lens optical system of which the first direction and the second direction are directed in the same direction to each other on the same axis. The method according to claim 1,
The dual lens optical system having a cover disposed on the object side of the first reflective member to selectively block the light incident from the first direction. Claim 1 to 6, and 8 to 17, wherein the first optical system and the second optical system of any one of the first optical system is used in the still image shooting mode and the second optical system is a video shooting Digital camera module used in the mode.

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