KR20080022260A - Optical device with zoom lens - Google Patents

Optical device with zoom lens Download PDF

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Publication number
KR20080022260A
KR20080022260A KR1020060085452A KR20060085452A KR20080022260A KR 20080022260 A KR20080022260 A KR 20080022260A KR 1020060085452 A KR1020060085452 A KR 1020060085452A KR 20060085452 A KR20060085452 A KR 20060085452A KR 20080022260 A KR20080022260 A KR 20080022260A
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South Korea
Prior art keywords
optical
light
lens
optical element
zoom lens
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KR1020060085452A
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Korean (ko)
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이상근
권영만
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엘지전자 주식회사
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Priority to KR1020060085452A priority Critical patent/KR20080022260A/en
Publication of KR20080022260A publication Critical patent/KR20080022260A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/185—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors with means for adjusting the shape of the mirror surface
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/0075—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having an element with variable optical properties
    • 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
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/282—Autofocusing of zoom lenses

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

An optical device with a zoom lens is provided to decrease a thickness of the optical device in an X-direction by arranging a light receiving sensor in a Y-axis. An optical device with a zoom lens includes a first optical element(202), a second optical element(204), and a light receiving element(205). The first optical element changes a propagation path of an inlet beam. The second optical element passes or diffracts the light, whose propagation path is changed by the first optical element, and outputs the passed or diffracted beam. The light receiving element is arranged at an end of an optical path of the beam, which passes through the second optical element. The first optical element is a reflective variable focus mirror. The second optical element is a transmissive variable focus diffractive element.

Description

줌 렌즈 광학장치{Optical Device With Zoom Lens}Optical device with zoom lens

도1은 종래의 광학 장치 구조를 나타낸 도면1 is a view showing a conventional optical device structure

도2는 본 발명의 실시예에 따른 광학 장치 구조를 나타낸 도면2 shows an optical device structure according to an embodiment of the present invention;

도3은 종래의 광학 장치가 휴대장치에 적용된 예를 나타낸 도면3 is a view showing an example in which a conventional optical device is applied to a portable device;

도4는 본 발명의 실시예에 따른 광학 장치가 휴대장치에 적용된 예를 나타낸 도면4 is a view showing an example in which an optical device according to an embodiment of the present invention is applied to a portable device;

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

201,203,205: 렌즈 202: 반사형 초점 가변 미러201,203,205: Lens 202: Reflective focus variable mirror

204: 투과형 초점 가변 회절 광학소자204: transmission focal variable diffractive optical element

206: 수광 소자206: light receiving element

본 발명은 줌 렌즈 광학 장치에 관한 것이다.The present invention relates to a zoom lens optical device.

일반적인 줌 렌즈 광학 장치에는 광학계의 배율을 변화시키기 위한 배리에이터(Variator)용 렌즈와 포커싱 역할을 하는 컴펀세이터(Compensator)용 렌즈가 장착된다. 종래의 광학계에서는 이들 렌즈를 기계적인 방법으로 구동하였다. A general zoom lens optical device is equipped with a lens for a variator for changing the magnification of an optical system and a lens for a compensator that serves as a focusing function. In the conventional optical system, these lenses were driven by a mechanical method.

또 다른 구동방법으로서, MEMS 기술을 이용한 반사형 초점 가변 소자를 이용하는 방식도 있으나, 이 방식에 의해 구성된 줌 렌즈 광학계는 광학 설계의 자유도가 떨어져 불리하다. 즉, 반사형 초점 가변 소자의 경우 반사형이기 때문에 광의 입력 방향이 일정해야 하고, 반사형이기 때문에 입사면 측에 렌즈가 필수적으로 요구된다. MEMS 기술을 이용한 설계는 입사광의 입사 방향 자유도가 지극히 한정적이기 때문에 실제 휴대폰, PDA 등의 휴대 장치에 실장될 경우 두께에 큰 제약을 가져온다.As another driving method, there is a method of using a reflective focus variable element using MEMS technology, but the zoom lens optical system constructed by this method is disadvantageous due to its lack of freedom in optical design. That is, in the case of the reflective focus variable element, the input direction of light must be constant because it is a reflection type, and a lens is essentially required on the incident surface side because it is a reflection type. The design using the MEMS technology has a very limited degree of freedom in the incident direction of the incident light, which places a great limitation on the thickness when mounted in a portable device such as a mobile phone or a PDA.

도1은 종래 광학 장치의 구조를 나타낸다.1 shows the structure of a conventional optical device.

광학 장치로 입사된 광은 배율을 높이기 위한 렌즈(101)를 통과하여, 제1 초점 가변 미러(102)에 의해 반사된다. 제1 초점 가변 미러(102)는 반사형 초점 가변 미러인데, 다수의 미러로 구성된 회절 소자로서 다수의 미러 각각을 제어함으로써 입사되는 광의 초점을 가변시켜 반사시키는 소자이다.Light incident on the optical device passes through the lens 101 for increasing magnification and is reflected by the first variable focus mirror 102. The first focal variable mirror 102 is a reflective focal variable mirror, which is a diffractive element composed of a plurality of mirrors, which is configured to vary and reflect the focus of incident light by controlling each of the plurality of mirrors.

제1 초점 가변 미러(102)를 통과한 광은 렌즈(103)를 통과하여 제2 초점 가변 미러(104)에 의해 반사된다. 제1 초점 가변 미러(104)는 반사형 초점 가변 미러인데, 다수의 미러로 구성된 회절 소자로서 다수의 미러 각각을 제어함으로써 입사되는 광의 초점을 가변시켜 반사시키는 소자이다. 제2 초점 가변 미러(104)에 의해서 반사된 광은 렌즈(105)를 통과하여 수광 소자(106)로 입사된다.Light passing through the first variable focus mirror 102 passes through the lens 103 and is reflected by the second variable focus mirror 104. The first focal variable mirror 104 is a reflective focal variable mirror, which is a diffractive element composed of a plurality of mirrors, which is configured to reflect and vary the focus of incident light by controlling each of the plurality of mirrors. Light reflected by the second variable focus mirror 104 passes through the lens 105 and is incident to the light receiving element 106.

도1에 도시된 바와 같은 종래 광학 장치에서는 입사광이 출사광과 동일 평면에 놓이고, 나머지 광학 소자들도 모두 동일한 평면 내에 놓이게 되어, x축 방향으로 소정의 두께 Ts가 반드시 요구되는 설계상의 한계를 갖는다. 통상적으로 x축 방향이 광학 장치가 장착될 휴대 장치의 두께 방향이 되기 때문에 결국 휴대 장치의 두께가 증가하게 된다. 특히, 줌 렌드 광학계를 이루기 위하여 반사형 초점 가변 미러(102, 104)를 2개 사용할 경우 수광 소자(106)가 y축과 평행하게 놓이게 되기 때문에 광학계 전체의 두께가 x축으로 두꺼워지게 된다.In the conventional optical apparatus as shown in FIG. 1, incident light is placed on the same plane as the emitted light, and all the remaining optical elements are also placed on the same plane, thereby limiting a design limitation in which a predetermined thickness Ts is required in the x-axis direction. Have Typically, since the x-axis direction becomes the thickness direction of the portable device on which the optical device is to be mounted, the thickness of the portable device eventually increases. In particular, when two reflective focus variable mirrors 102 and 104 are used to achieve a zoom-lend optical system, since the light receiving element 106 is placed in parallel with the y-axis, the entire thickness of the optical system becomes thick on the x-axis.

최근 휴대폰이나, PDA에 사용되고 있는 카메라 모듈의 개발 방향의 초점은 카메라 모듈의 크기를 줄이는 데 있다. 종래의 AF(Auto Focusing) 및 줌 기능이 포함된 카메라 모듈은 렌즈의 기계적인 움직임으로 인해 신뢰성을 떨어뜨리고 렌즈의 이동범위를 확보하기 위해 부피가 커지게 커진다. Recently, the focus of the development direction of the camera module used in a mobile phone or a PDA is to reduce the size of the camera module. Conventional AF (auto focusing) and the camera module including the zoom function is bulky to reduce the reliability and to ensure the lens movement range due to the mechanical movement of the lens.

또한, MEMS 기술을 이용하여 설계된 카메라 모듈의 경우 그 설계 제약 사항으로 인해 부피를 줄이는데 한계가 있다. 위와 같은 카메라 모듈의 설계 제한을 극복하고, 카메라 모듈이 장착될 휴대 장치의 두께를 줄일 수 있는 기술이 요구된다.In addition, camera modules designed using MEMS technology have limitations in volume reduction due to their design constraints. In order to overcome the design limitations of the camera module as described above, and to reduce the thickness of the portable device to which the camera module is mounted is required.

본 발명의 목적은 슬림 줌 렌즈 광학장치를 제공하는데 있다.An object of the present invention is to provide a slim zoom lens optical device.

본 발명의 다른 목적은 휴대폰 등의 휴대 장치 내에 장착되면서도, 휴대 장치의 두께를 줄일 수 있는 카메라 모듈용 광학 장치를 제공하는데 있다.Another object of the present invention is to provide an optical device for a camera module that can be mounted in a portable device such as a mobile phone and can reduce the thickness of the portable device.

본 발명의 또 다른 목적은 MEMS 기술로 구현된 회절 소자를 이용하는 광학 장치에서, 그 설계적 제한을 극복할 수 있는 광학 장치를 제공하는데 있다.Another object of the present invention is to provide an optical device that can overcome the design limitations in an optical device using a diffractive element implemented by MEMS technology.

상기 목적을 달성하기 위한 본 발명의 실시예에 따른 줌 렌즈 광학장치는,Zoom lens optical apparatus according to an embodiment of the present invention for achieving the above object,

입사 광의 광로를 변화시키는 제 1 광학 소자; 상기 제 1 광학 소자에 의하 여 광로가 변경된 광을 투과 및 회절시켜 출사하는 제 2 광학 소자; 상기 제 2 광학 소자를 투과한 광로의 종단에 배치되는 수광소자; 를 포함하는 것을 특징으로 한다.A first optical element for changing an optical path of incident light; A second optical element that transmits and diffracts the light whose optical path is changed by the first optical element and emits the light; A light receiving element disposed at an end of the optical path passing through the second optical element; Characterized in that it comprises a.

또한 본 발명의 실시예에 따른 줌 렌즈 광학장치에서, 상기 제 1 광학 소자는 광 회절 및 반사를 이루는 반사형 초점 가변 미러인 것을 특징으로 한다.In addition, in the zoom lens optical device according to the embodiment of the present invention, the first optical element is a reflection type focus variable mirror that performs light diffraction and reflection.

또한 본 발명의 실시예에 따른 줌 렌즈 광학장치에서, 상기 제 2 광학 소자는 광 회절 및 투과를 이루는 투과형 초점 가변 회절 광학 소자인 것을 특징으로 한다.In addition, in the zoom lens optical apparatus according to the embodiment of the present invention, the second optical element is a transmission-type focus variable diffractive optical element that achieves light diffraction and transmission.

또한 상기 목적을 달성하기 위한 본 발명의 실시예에 따른 줌 렌즈 광학장치는, 입사 광 집속을 위한 입사 렌즈; 상기 입사 렌즈를 통과한 광의 광로를 변화시키는 반사형 초점 가변 미러; 상기 반사형 초점 가변 미러에 의해서 반사된 광 집속을 위한 중간 렌즈; 상기 중간 렌즈를 통과한 광을 투과시킴과 함께 그 초점을 가변시켜 주기 위한 투과형 초점 가변 회절 광학 소자; 상기 투과형 초점 가변 회절 광학 소자를 통과한 광의 집속을 위한 출사 렌즈; 및, 상기 출사 렌즈를 투과한 광로의 종단에 그 광로와 평행하게 배치되는 수광소자; 를 포함하는 것을 특징으로 한다.In addition, a zoom lens optical apparatus according to an embodiment of the present invention for achieving the above object, the incident lens for focusing incident light; A reflective focus variable mirror for changing an optical path of light passing through the incident lens; An intermediate lens for focusing light reflected by the reflective focus variable mirror; A transmissive focus variable diffractive optical element for transmitting light passing through the intermediate lens and varying its focus; An emission lens for focusing light passing through the transmission focus variable diffractive optical element; And a light receiving element disposed at an end of the optical path passing through the exit lens in parallel with the optical path. Characterized in that it comprises a.

또한 본 발명의 실시예에 따른 줌 렌즈 광학장치에서, 상기 반사형 초점 가변 소자는 줌(zoom)을 위한 광 배율 조절 소자인 것을 특징으로 한다.In addition, in the zoom lens optical apparatus according to the embodiment of the present invention, the reflective focus variable element is an optical magnification adjusting element for zooming.

또한 본 발명의 실시예에 따른 줌 렌즈 광학장치에서, 상기 투과형 초점 가변 회절 광학 소자는 포커싱(focusing)을 위한 초점 조절 소자인 것을 특징으로 한 다.In addition, in the zoom lens optical device according to the embodiment of the present invention, the transmission focus variable diffractive optical element is characterized in that the focusing element for focusing (focusing).

또한 본 발명의 실시예에 따른 줌 렌즈 광학장치에서, 상기 입사 렌즈에서 반사형 초점 가변 미러에 이르는 광로와, 상기 반사형 초점 가변 미러로부터 중간 렌즈, 투과형 초점 가변 회절 광학소자, 출사 렌즈 및 수광 소자에 이르는 광로는 서로 수직한 방향에 놓이는 것을 특징으로 한다.In addition, in the zoom lens optical apparatus according to the embodiment of the present invention, an optical path from the incident lens to the reflective focus variable mirror, the intermediate lens from the reflective focus variable mirror, the transmissive focus variable diffractive optical element, the exit lens and the light receiving element The light path leading to is characterized in being placed in a direction perpendicular to each other.

이하, 첨부된 도면을 참조하여 본 발명의 실시예에 따른 줌 렌즈 광학장치를 설명한다.Hereinafter, a zoom lens optical apparatus according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

도2는 본 발명의 실시예에 따른 줌 렌즈 광학장치의 구조를 보여준다. 도2를 참조하면 본 발명의 실시예에 따른 줌 렌즈 광학장치는 광 입사단으로부터 수광단(최종 출사단)까지의 광 경로상에, 입사 렌즈(201), 반사형 초점 가변 미러(202), 중간 렌즈(203), 투과형 초점 가변 회절 광학소자(204), 출사 렌즈(205), 수광 소자(206)가 배열된다. 광로에 대한 각 소자의 배열 관계는 설명과 이해를 돕기 위하여 도면에서 x축, y축, z축을 기준으로 표현하였다.2 shows the structure of a zoom lens optics according to an embodiment of the invention. 2, the zoom lens optical apparatus according to the embodiment of the present invention includes an incident lens 201, a reflective focus variable mirror 202, on an optical path from a light incident end to a light receiving end (final output end). The intermediate lens 203, the transmissive focus variable diffractive optical element 204, the exit lens 205, and the light receiving element 206 are arranged. The arrangement relationship of each device with respect to the optical path is expressed based on the x-axis, y-axis, and z-axis in the drawings to help explain and understand.

입사 렌즈(201)는 피사체의 상(광)에 해당되는 배율을 높이기 위하여 사용된다. 입사 렌즈(201)는 입사 광로에 대하여 직교하는 단면 방향(도면에서 x축 방향)에 놓인다. 입사 렌즈(201)와 반사형 초점 가변 미러(202)는 광 경로 상에서 광을 수직 방향으로 반사시키는 상대적 위치에 놓인다.The incident lens 201 is used to increase the magnification corresponding to the image (light) of the subject. The incident lens 201 is placed in the cross-sectional direction (x-axis direction in the drawing) orthogonal to the incident optical path. The incident lens 201 and the reflective focus variable mirror 202 are placed at relative positions that reflect light in the vertical direction on the light path.

초점 가변 미러(202)는 입사 렌즈(201)를 통과한 광을 수직 방향(도면에서 y축 방향)으로 변화시킨다. 중간 렌즈(203)는 초점 가변 미러(202)에 의해서 수직 방향으로 경로가 변화된 광로에 대하여 직교하는 단면 방향(도면에서 y축 방향)에 놓인다.The variable focus mirror 202 changes the light passing through the incident lens 201 in the vertical direction (y-axis direction in the drawing). The intermediate lens 203 is placed in the cross-sectional direction (y-axis direction in the figure) orthogonal to the optical path whose path is changed in the vertical direction by the variable focus mirror 202.

중간 렌즈(203)를 통과한 광은 투과형 초점 가변 회절 광학 소자(204)에 입사된다. 투과형 초점 가변 회절 광학 소자(204)는 초점 가변 미러(202)에 의해서 수직 방향(y축 방향)으로 경로가 변화되고 중간 렌즈(203)를 통과한 광로에 대하여 직교하는 단면 방향(도면에서 y축 방향)에 놓인다.Light passing through the intermediate lens 203 is incident on the transmission focal variable diffractive optical element 204. The transmissive focal variable diffraction optical element 204 has a path changed in the vertical direction (y-axis direction) by the focal variable mirror 202 and is a cross section direction (y-axis in the figure) perpendicular to the optical path passing through the intermediate lens 203. Direction).

투과형 초점 가변 회절 광학 소자(204)를 통과한 광은 출사 렌즈(205)에 입사된다. 출사 렌즈(205)는 반사형 초점 가변 미러(202)에 의해서 수직 방향(y축 방향)으로 경로가 변하되고 중간 렌즈(203) 및 투과형 초점 가변 회절 광학 소자(204)를 통과한 광로에 대하여 직교하는 단면 방향(y축 방향)에 놓인다.Light passing through the transmissive focal variable diffractive optical element 204 is incident on the exit lens 205. The exit lens 205 is orthogonal to the optical path through which the path is changed in the vertical direction (y-axis direction) by the reflective focus variable mirror 202 and passes through the intermediate lens 203 and the transmissive focus variable diffractive optical element 204. In the cross-sectional direction (y-axis direction).

출사 렌즈(205)를 통과한 광은 수광 소자(206)에 입사된다. 수광 소자(206)는 출사 렌즈(205)를 통과한 광로에 대하여 직교하는 단면 방향(y축 방향)에 놓인다.Light passing through the exit lens 205 is incident on the light receiving element 206. The light receiving element 206 is placed in the cross-sectional direction (y-axis direction) orthogonal to the optical path passing through the exit lens 205.

도2에 나타내고 앞서 설명한 본 발명의 실시예에 따른 줌 렌즈 광학장치를 살펴보면, 입사 광을 반사형 초점 가변 미러(202)에 의해서 수직 방향으로 반사시키고, 수직 방향으로 경로가 변화된 광은 투과형 초점 가변 회절 광학소자(204)에 의해서 투과되어 종단의 수광 소자(206)에 입사되는 구조를 갖는다. 여기서 수광 소자(206)는 y축 방향, 즉 수직 방향으로 변화된 광 경로의 종단에 직교하는 단면 방향에 놓이게 되는 구조가 된다. 따라서, 줌 렌즈 광학장치(줌 렌즈 카메라 모듈)의 두께(Tr), 즉 x축 방향으로의 두께가 종래의 도1에 나타낸 두께(Ts) 보다 줄어들게 된다.Referring to the zoom lens optical apparatus according to the embodiment of the present invention shown in FIG. 2 and described above, the incident light is reflected by the reflective focus variable mirror 202 in the vertical direction, and the light whose path is changed in the vertical direction is a transmission-type focus variable. It has a structure that is transmitted by the diffractive optical element 204 and is incident on the light receiving element 206 at the terminal. Here, the light receiving element 206 has a structure in which the light receiving element 206 is placed in the cross-sectional direction perpendicular to the end of the optical path changed in the y-axis direction, that is, the vertical direction. Therefore, the thickness Tr of the zoom lens optical device (zoom lens camera module), that is, the thickness in the x-axis direction is reduced than the thickness Ts shown in FIG.

즉, 반사형 초점 가변 미러(202)와 투과형 초점 가변 회절 광학 소자(204)를 이용함으로써, 수광 소자(206)가 y축 방향에 놓이게 되고, 이에 따라 x축 방향의 두께(Tr)가 줄어들게 되는 것이다. 이러한 구조에 따르면 광학계의 구성 자유도에서 장점을 가질 수 있게 되는 것이다. 또한, 카메라 모듈(줌 렌즈 광학장치)의 형상이 한쪽에서 잘린 모양이 육면체 형상을 갖게 되어 휴대 장치에 장착될 때 더욱 유리하게 된다(후에 도4를 참조하여 설명될 것이다).That is, by using the reflective focal variable mirror 202 and the transmission focal variable diffractive optical element 204, the light receiving element 206 is placed in the y-axis direction, thereby reducing the thickness (Tr) in the x-axis direction will be. According to this structure, it is possible to have an advantage in the degree of freedom of construction of the optical system. Further, the shape of the camera module (zoom lens optics) cut off on one side has a hexahedron shape, which is more advantageous when mounted on the portable device (to be described later with reference to FIG. 4).

도2에 나타낸 광학계를 살펴본다. 입사 광은 입사 렌즈(201)를 통과하여 반사형 초점 가변 미러(202)에서 수직방향으로 광로가 변경된다. 입사 렌즈(201)는 피사체의 상에 대한 광 정보를 보다 풍부하게 획득하기 위하여 입사 광의 배율(증폭)을 높여준다. 반사형 초점 가변 미러(202)는 다수의 미러로 구성된 회절 소자로서 다수의 미러 각각을 제어함으로써 입사되는 광의 초점을 가변시켜 반사시키는 소자이다.The optical system shown in FIG. 2 will be described. The incident light passes through the incident lens 201 and the optical path is changed in the vertical direction at the reflective focus variable mirror 202. The incident lens 201 increases the magnification (amplification) of the incident light in order to more abundantly acquire the light information on the image of the subject. The reflective focus variable mirror 202 is a diffractive element composed of a plurality of mirrors, and is a device for varying and reflecting the focus of incident light by controlling each of the plurality of mirrors.

반사형 초점 가변 미러(202)를 통과한 광은 중간 렌즈(203)를 통과하여 투과형 초점 가변 회절 광학소자(204)를 통과한다 투과형 초점 가변 회절 광학소자(204)는 중간 렌즈(203)를 통과한 광을 투과시키며, 이는 회절 광학소자로 이루어지고, 광 투과시 회절 작용을 기반으로 그 초점을 가변시켜 준다.The light passing through the reflective focal variable mirror 202 passes through the intermediate lens 203 and passes through the transmissive focus variable diffractive optical element 204. The transmissive focal variable diffractive optical element 204 passes through the intermediate lens 203. It transmits one light, which consists of diffractive optical elements, and changes its focus based on the diffraction effect upon light transmission.

투과형 초점 가변 회절 광학 소자(204)를 통과한 광은 출사 렌즈(205)를 통과하여 수광 소자(205)에 입사된다. 수광 소자(205)는 피사체로부터 획득하는 광 신호를 전기적인 신호로 변환함으로써, 피사체 영상에 해당되는 전기신호를 획득한다. 수광 소자(206)에 의해 변환된 전기 신호는 광학 장치가 장착되는 휴대폰 등의 단말 장치에서 처리된다.Light passing through the transmissive focal variable diffraction optical element 204 passes through the exit lens 205 and is incident on the light receiving element 205. The light receiving element 205 acquires an electrical signal corresponding to the subject image by converting an optical signal obtained from the subject into an electrical signal. The electrical signal converted by the light receiving element 206 is processed in a terminal device such as a mobile phone equipped with the optical device.

종래에는 입사광의 광 경로와 광학 장치 내 및 출사광의 광 경로가 동일 평면(x축 방향 및 x축 방향) 내에 놓이고, 수광 센서가 x축의 종단에 놓였기 때문에 평면의 폭이 곧 광학 장치 두께(Ts)의 최소값을 제한하였다. 따라서, 광학 장치 및 광학 장치가 장착되는 휴대 장치의 두께를 줄이는데 한계가 있었다. Conventionally, since the optical path of the incident light and the optical path of the inside and the outgoing light lie in the same plane (x-axis direction and x-axis direction), and the light receiving sensor is placed at the end of the x-axis, the width of the plane is the optical device thickness ( The minimum value of Ts) was limited. Therefore, there was a limit in reducing the thickness of the optical device and the portable device on which the optical device is mounted.

그러나, 본 발명에 따른 광학 장치에 따르면, 입사광의 광 경로와, 광학 장치 내의 광 경로 및 출사광의 광 경로가 수직이기 때문에 설계 자유도를 확보할 수 있게 된다. 또한, 수광 센서(206)가 y축 방향에 놓이게 되므로 x축 방향으로 놓였던 기존의 구조에 비하여 그 두께(x축 방향의 두께)를 줄일 수 있게 된다. 따라서 슬림(slim)형의 카메라 모듈 구현이 보다 더 용이하게 이루어질 수 있다.However, according to the optical device according to the present invention, since the optical path of the incident light, the optical path in the optical device, and the optical path of the emitted light are perpendicular, it is possible to secure design freedom. In addition, since the light receiving sensor 206 is placed in the y-axis direction, the thickness (thickness in the x-axis direction) can be reduced as compared with the conventional structure placed in the x-axis direction. Therefore, the slim type camera module may be more easily implemented.

본 발명의 실시예에서 반사형 초점 가변 미러(202)는 각각 별개로 제어가 가능한 다수의 미러로 구성되며, 입사한 광을 회절시켜, 필요에 따라 증폭을 하거나 자동 포커싱을 하도록 제어할 수 있다.In the exemplary embodiment of the present invention, the reflective focus variable mirror 202 is composed of a plurality of mirrors, each of which can be controlled separately, and diffracted incident light can be controlled to amplify or auto focus as necessary.

본 발명의 실시예에서 투과형 초점 가변 회절 광학 소자(204)는 내부 매질의 특성에 따라 광의 회절을 제어할 수 있는 광학 소자이다.In the embodiment of the present invention, the transmission focus variable diffractive optical element 204 is an optical element capable of controlling the diffraction of light according to the characteristics of the internal medium.

본 발명의 실시예에서, 상기 반사형 초점 가변 미러(202)에 의한 1차 회절은 입사광의 배율을 증폭시키는 줌(zoom) 역할이고, 상기 투과형 초점 가변 회절 광학 소자(204)에 의한 2차 회절은 자동 포커싱(Auto Focusing)을 위한 회절이다.In an embodiment of the present invention, the first order diffraction by the reflective focus variable mirror 202 serves as a zoom to amplify the magnification of incident light, and the second order diffraction by the transmission focus variable diffraction optical element 204. Is diffraction for auto focusing.

실시예에 따라서는, 상기 반사형 초점 가변 미러(202)와 투과형 초점 가변 회절 광학 소자(204)의 역할이 위와 반대로 될 수 있다.In some embodiments, the roles of the reflective focusing mirror 202 and the transmission focusing diffractive optical element 204 may be reversed.

실시예에 따라서, 줌 기능이 필요없는 광학 장치의 경우에는 자동 포커싱을 하는 회절 소자 한 개만을 사용하여 광학 장치를 구성할 수도 있으며, 회절 소자들의 기능을 세분화하여 2개 이상의 회절 소자를 사용하여 광학 장치를 구성할 수도 있다.According to an embodiment, in the case of an optical device that does not require a zoom function, the optical device may be configured using only one diffractive element that performs automatic focusing, and the optical device may be divided into two or more diffractive elements by using two or more diffractive elements. You can also configure the device.

도3은 종래의 광학 장치가 휴대 장치에 적용되는 예를 나타낸다.3 shows an example in which a conventional optical device is applied to a portable device.

도3에 도시된 바와 같이, 종래의 광학 장치(100)는 입사광, 광학 장치(100)의 광, 출사광의 광 경로가 모두 동일 평면(x축 방향) 내에 놓이는 데다가 출사광의 종단(x축 방향)에 수광 센서가 놓인다. 그러므로 그 평면의 폭이 곧 광학 장치의 두께(Ts)로 연결되기 때문에, 광학 장치(100)가 장착되는 휴대 장치(110) 등의 단말 장치의 두께를 줄이는데 한계가 있다.As shown in FIG. 3, in the conventional optical apparatus 100, the incident light, the optical path of the optical apparatus 100, and the light path of the outgoing light are all in the same plane (x-axis direction), and the end of the outgoing light (x-axis direction). The light receiving sensor is placed on the Therefore, since the width of the plane is directly connected to the thickness Ts of the optical device, there is a limit in reducing the thickness of the terminal device such as the portable device 110 on which the optical device 100 is mounted.

도4는 본 발명에 따른 광학 장치가 휴대 장치에 적용되는 예를 나타낸다.4 shows an example in which the optical device according to the present invention is applied to a portable device.

도4에 도시된 바와 같이, 본 발명에 따른 광학 장치(200)에서는 출사광의 종단이 y축 방향에서 끝나는 구조이고, 그 종단(y축 방향)에 수광 센서가 놓이는 구조이기 때문에 휴대 장치(210)의 두께를 대폭 줄일 수 있다. 도4에 나타낸 바와 같이, 광학장치(200)를 포함하는 카메라 모듈의 형상이 한쪽에서 잘린 모양(도면에서는 상측 후면이 잘린 모양)이 육면체 형상을 갖게 되어 휴대 장치에 카메라 모듈이 장착될 때 설계 및 설치 자유도가 좋고 슬림화하는데도 장애가 그 만큼 줄어들게 된다.As shown in Fig. 4, in the optical device 200 according to the present invention, since the end of the emitted light is terminated in the y-axis direction and the light receiving sensor is placed at the end (y-axis direction), the portable device 210 is provided. The thickness of can be greatly reduced. As shown in Fig. 4, the shape of the camera module including the optical device 200 is cut off on one side (in the figure, the upper back is cut off) to have a hexahedron shape so that the camera module is mounted on the portable device. The freedom of installation is good and the obstacles are reduced even if it is slim.

본 발명의 광학 장치에 따르면 휴대폰 등의 휴대 장치 내에 장착되면서도, 휴대 장치의 두께를 대폭 줄일 수 있다.According to the optical device of the present invention, the thickness of the portable device can be greatly reduced while being mounted in a portable device such as a mobile phone.

또한, 본 발명의 광학 장치는, MEMS 기술로 구현된 회절 소자를 이용하면서도, 그 회절 소자의 설계적 제한을 극복할 수 있는 광학 장치를 제공할 수 있다.In addition, the optical device of the present invention can provide an optical device that can overcome the design limitations of the diffractive element while using a diffraction element implemented by MEMS technology.

Claims (7)

입사 광의 광로를 변화시키는 제 1 광학 소자;A first optical element for changing an optical path of incident light; 상기 제 1 광학 소자에 의하여 광로가 변경된 광을 투과 및 회절시켜 출사하는 제 2 광학 소자;A second optical element for transmitting and diffracting the light whose optical path is changed by the first optical element and emitting the light; 상기 제 2 광학 소자를 투과한 광로의 종단에 배치되는 수광소자;A light receiving element disposed at an end of the optical path passing through the second optical element; 를 포함하는 것을 특징으로 하는 줌 렌즈 광학장치.Zoom lens optical apparatus comprising a. 제 1 항에 있어서, 상기 제 1 광학 소자는 광 회절 및 반사를 이루는 반사형 초점 가변 미러인 것을 특징으로 하는 줌 렌즈 광학장치.The zoom lens optical apparatus according to claim 1, wherein the first optical element is a reflective focus variable mirror that performs light diffraction and reflection. 제 1 항에 있어서, 상기 제 2 광학 소자는 광 회절 및 투과를 이루는 투과형 초점 가변 회절 광학 소자인 것을 특징으로 하는 줌 렌즈 광학장치.2. The zoom lens optical device according to claim 1, wherein the second optical element is a transmission-type focal variable diffractive optical element that performs light diffraction and transmission. 입사 광 집속을 위한 입사 렌즈;An incident lens for incident light focusing; 상기 입사 렌즈를 통과한 광의 광로를 변화시키는 반사형 초점 가변 미러;A reflective focus variable mirror for changing an optical path of light passing through the incident lens; 상기 반사형 초점 가변 미러에 의해서 반사된 광 집속을 위한 중간 렌즈;An intermediate lens for focusing light reflected by the reflective focus variable mirror; 상기 중간 렌즈를 통과한 광을 투과시킴과 함께 그 초점을 가변시켜 주기 위한 투과형 초점 가변 회절 광학 소자;A transmissive focus variable diffractive optical element for transmitting light passing through the intermediate lens and varying its focus; 상기 투과형 초점 가변 회절 광학 소자를 통과한 광의 집속을 위한 출사 렌 즈; 및,An emission lens for focusing light passing through the transmission-type focal variable diffraction optical element; And, 상기 출사 렌즈를 투과한 광로의 종단에 그 광로와 평행하게 배치되는 수광소자;A light receiving element disposed at an end of the optical path passing through the exit lens in parallel with the optical path; 를 포함하는 것을 특징으로 하는 줌 렌즈 광학장치.Zoom lens optical apparatus comprising a. 제 4 항에 있어서, 상기 반사형 초점 가변 소자는 줌(zoom)을 위한 광 배율 조절 소자인 것을 특징으로 하는 줌 렌즈 광학장치.5. The zoom lens optical device according to claim 4, wherein the reflective focus variable element is an optical magnification adjusting element for zooming. 제 4 항에 있어서, 상기 투과형 초점 가변 회절 광학 소자는 포커싱(focusing)을 위한 초점 조절 소자인 것을 특징으로 하는 줌 렌즈 광학장치.5. The zoom lens optical device according to claim 4, wherein the transmissive focus variable diffractive optical element is a focus adjusting element for focusing. 제 4 항에 있어서, 상기 입사 렌즈에서 반사형 초점 가변 미러에 이르는 광로와, 상기 반사형 초점 가변 미러로부터 중간 렌즈, 투과형 초점 가변 회절 광학소자, 출사 렌즈 및 수광 소자에 이르는 광로는 서로 수직한 방향에 놓이는 것을 특징으로 하는 줌 렌즈 광학장치.The optical path from the incident lens to the reflective focusing mirror and the optical path from the reflective focusing mirror to the intermediate lens, the transmission focusing diffractive optical element, the exit lens, and the light receiving element are perpendicular to each other. And zoom lens optics.
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