KR20020083026A - Optical system for digital camera - Google Patents

Optical system for digital camera Download PDF

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Publication number
KR20020083026A
KR20020083026A KR1020010022285A KR20010022285A KR20020083026A KR 20020083026 A KR20020083026 A KR 20020083026A KR 1020010022285 A KR1020010022285 A KR 1020010022285A KR 20010022285 A KR20010022285 A KR 20010022285A KR 20020083026 A KR20020083026 A KR 20020083026A
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KR
South Korea
Prior art keywords
lens
digital camera
optical system
plane
image sensor
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KR1020010022285A
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Korean (ko)
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KR100390435B1 (en
Inventor
정준호
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엘지전자 주식회사
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Priority to KR10-2001-0022285A priority Critical patent/KR100390435B1/en
Publication of KR20020083026A publication Critical patent/KR20020083026A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)
  • Studio Devices (AREA)

Abstract

PURPOSE: An optical system for a digital camera is provided, which can realize a compact digital camera by improving an optical system configuration of the digital camera. CONSTITUTION: An iris diaphragm to control a light intensity is installed adjacently on one plane of the first lens(10), and a diffractive optical element(DOE) is applied on an opposite plane of the first lens. The second lens(20) having a negative refractive index is located between the first lens and an image sensor(40), and one plane of the second lens has an IR coating so that it passes a visible ray and blocks a wavelength of an infrared ray region. Therefore, a light incident on a camera lens from a light source passes through the iris diaphragm and the first lens and the second lens in sequence and thus realize a desired screen imaged on an imaging plane of the image sensor.

Description

디지털 카메라용 광학계{Optical system for digital camera}Optical system for digital camera

본 발명은 디지털 카메라의 광학계에 관한 것으로, 특히 텔레포토 형태의 컴팩트한 카메라 구성이 가능하도록 한 디지털 카메라용 광학계에 관한 것이다.The present invention relates to an optical system of a digital camera, and more particularly, to an optical system for a digital camera that enables a compact camera configuration in the form of a telephoto.

일반적으로, 디지털 카메라는 그 구조에 있어서 일반 카메라의 광학과 메카니즘을 이용한다는 점에서 유사하지만 필름 대신 CCD(Charge Coupled Device)라는 영상센서로 화상을 받아들여 그 신호를 디지털 데이터로 변환하고 그래픽 파일로 메모리에 저장하는 방식을 취하는 점에서 차이가 있다.In general, digital cameras are similar in that they use the optics and mechanism of ordinary cameras, but instead of film, they take images with an image sensor called CCD (Charge Coupled Device), convert the signals into digital data, and store them as graphic files. The difference is that it takes a way to store in.

이러한 디지털 카메라는 촬영한 화면을 LCD 화면을 통해 즉석에서 확인할 수 있으며 컴퓨터를 통한 편집, 출력 등 다양한 자료처리가 가능하고, 필요시 복잡한 필름 현상 및 인화과정없이 즉시 프린터로 인쇄할 수 있으므로 그 활용도가 확대되고 있다.These digital cameras can instantly check the screen shots through the LCD screen, and can process various data such as editing and output through a computer, and can immediately print them to the printer without complicated film development and printing process if necessary. It is expanding.

첨부된 도면의 도 1은 상기와 같은 디지털 카메라의 광학계를 개략적으로 설명하는 것으로, 적어도 하나의 면에 회절광학소자(DOE)가 적용된 음의 굴절능을 갖는 제 1렌즈(1)와, 적어도 하나의 면에 회절광학소자(DOE)가 적용된 양의 굴절능을 갖는 제 2렌즈(2)와, 상기 제 1렌즈(1)와 제 2렌즈(2) 사이에서 광량을 조절하는 기능을 하는 조리개(3) 및, 상기 제 2렌즈(1)와 CCD 이미지센서(5)의 결상면 사이에서 저주파수 대역을 통과시키고 나이키스트(Nyquist) 주파수 이상의 고주파수 영역을 차단하는 광학적필터(OLPF; Optical Low Pass Filter)(4)로 구성된다.1 of the accompanying drawings schematically illustrates the optical system of the digital camera as described above, the first lens 1 having a negative refractive power applied to the diffractive optical element (DOE) on at least one surface, and at least one A second lens 2 having a positive refractive power to which a diffractive optical element (DOE) is applied to a surface thereof, and an aperture function to adjust the amount of light between the first lens 1 and the second lens 2 ( 3) and an optical low pass filter (OLPF) for passing a low frequency band between the image forming surface of the second lens 1 and the CCD image sensor 5 and blocking a high frequency region above the Nyquist frequency. It consists of (4).

상기 광학적필터(OLPF)(4)는 복굴절 수정판과 원적외선 차단 필터(IR Cut Filter)로 구성되어 가시광선은 통과시키고 적외선 영역의 광선은 차단시킴으로써 렌즈를 통해 들어온 빛의 양을 최적 상태로 조절하여 주기 위해 설치된 것이다.The optical filter (OLPF) 4 is composed of a birefringent correction plate and an IR cut filter to allow visible light to pass through and to block light in the infrared region so that the amount of light entering through the lens is optimally adjusted. To be installed.

그런데, 상기와 같은 종래의 디지털 카메라 광학계는 결상특성을 향상시키기 위해 전술한 바와 같은 광학적필터(OLPF)를 삽입하여 사용하기 때문에 광학적필터가 위치하기 위해서는 광학계의 후초점거리(Back Focal Length)가 어느 정도 확보 되어야 하고, 이에 따라 컴팩트한 광학계를 구성하기가 곤란한 문제점을 안고 있었다.However, since the conventional digital camera optical system is used by inserting the optical filter (OLPF) as described above in order to improve the imaging characteristics, the back focal length of the optical system is determined in order to position the optical filter. It should be secured, and accordingly had a problem that it is difficult to configure a compact optical system.

이에 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, 디지털 카메라의 광학계 구성을 개선하여 컴팩트한 디지털 카메라를 구현할 수 있도록한 디지털 카메라용 광학계를 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide an optical system for a digital camera, which can realize a compact digital camera by improving an optical system configuration of the digital camera.

도 1은 종래의 디지털 카메라용 광학계를 나타낸 구성도1 is a block diagram showing a conventional optical system for a digital camera

도 2는 본 발명에 따른 디지털 카메라용 광학계를 나타낸 구성도2 is a block diagram showing an optical system for a digital camera according to the present invention

* 도면의 주요부분의 참조부호에 대한 설명 *Explanation of Reference Symbols in Major Parts of Drawings

10 - 제 1렌즈 20 - 제 2렌즈10-First Lens 20-Second Lens

30 - 조리개 40 - 이미지센서30-Aperture 40-Image Sensor

상기와 같은 목적을 달성하기 위하여 본 발명은, 한 면에 광량을 조절하는 조리개가 연접하게 설치되고, 적어도 한 면에 회절광학소자(DOE)가 적용된 양의 굴절능을 갖는 제 1렌즈와; 상기 제 1렌즈와 이미지센서의 결상면 사이에 위치하며, 적어도 한 면에 IR코팅이 된 음의 굴절능을 갖는 제 2렌즈를 포함하여 구성된 디지털 카메라용 광학계를 제공한다.In order to achieve the above object, the present invention includes a first lens having a positive refractive power applied to the diaphragm to adjust the amount of light on one surface, the diffraction optical element (DOE) is applied to at least one surface; An optical system for a digital camera is disposed between the first lens and an image forming surface of the image sensor, and includes a second lens having a negative refractive power with IR coating on at least one surface thereof.

이하 본 발명에 따른 디지털 카메라용 광학계의 일 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, an embodiment of an optical system for a digital camera according to the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 디지털 카메라용 광학계의 구성을 설명하는 도면으로, 양의 굴절능을 갖는 제 1렌즈(10)의 일면에 광량을 조절하기 위한 조리개(30)가 연접하게 설치되고, 이 제 1렌즈(10)의 반대면에는 회절광학소자(DOE)가 적용되어 있다.2 is a view for explaining the configuration of the optical system for a digital camera according to the present invention, the aperture 30 for adjusting the amount of light on one surface of the first lens 10 having a positive refractive power is connected in series, On the opposite side of the first lens 10 is a diffractive optical element (DOE) is applied.

그리고, 상기 제 1렌즈(10)와 상이 결상되는 이미지센서(40), 예컨대 CCD의 결상면 사이에는 음의 굴절능을 갖는 제 2렌즈(20)가 위치하게 되는데, 이 제 2렌즈(20)의 일면은 가시광선은 통과시키고 적외선 영역의 파장을 차단시키도록 IR코팅 처리가 되어 있다.In addition, a second lens 20 having a negative refractive power is positioned between the first lens 10 and the image sensor 40, for example, an image forming surface of the CCD, which is the second lens 20. One side of the surface is IR coated to pass visible light and block the wavelength in the infrared region.

따라서, 광원으로부터 카메라 렌즈에 입사된 빛은 조리개(30)와 제1렌즈(10) 및 제 2렌즈(20)를 차례로 통과하며 이미지센서(40)의 결상면에 결상되어 원하는 화면을 구현하게 된다.Therefore, the light incident on the camera lens from the light source passes through the aperture 30, the first lens 10, and the second lens 20 in sequence and forms an image on the imaging surface of the image sensor 40 to realize a desired screen. .

이상에서와 같이 본 발명에 따르면, 적외선을 차단하여 빛의 양을 최적화시켜 주기 위해 기존의 부피가 큰 광학적필터(OLPF)를 사용하지 않고 IR코팅된 렌즈를 사용하므로 광학계의 구성이 간단해지고, 이에 따라 컴팩트한 광학계의 구현이 가능해진다.As described above, according to the present invention, since the IR coated lens is used instead of the conventional bulk optical filter (OLPF) to block the infrared rays to optimize the amount of light, the configuration of the optical system is simplified, Accordingly, the compact optical system can be realized.

특히, 이러한 컴팩트한 광학계의 구성은 최근의 소형화 및 경량화가 요구되는 화상통신용 카메라 및 인터넷 TV용 피시(PC)카메라의 설계에 큰 이점을 가져다준다.In particular, such a compact optical system has a great advantage in the design of a video communication camera and an Internet TV fish (PC) camera, which require recent miniaturization and weight reduction.

Claims (2)

적어도 한 면에 회절광학소자(DOE)가 적용된 양의 굴절능을 갖는 제 1렌즈와;A first lens having a positive refractive power to which a diffractive optical element is applied to at least one surface; 상기 제 1렌즈와 이미지센서의 결상면 사이에 위치하며, 적어도 한 면에 IR코팅이 된 음의 굴절능을 갖는 제 2렌즈를 포함하여 구성된 디지털 카메라용 광학계.An optical system for a digital camera, comprising a second lens positioned between the first lens and an image forming surface of the image sensor and having a negative refractive power with IR coating on at least one surface. 제 1항에 있어서, 상기 제 1렌즈의 어느 한 면에 광량을 조절하는 조리개가 연접하게 설치된 것을 특징으로 하는 디지털 카메라용 광학계.The optical system for a digital camera according to claim 1, wherein an aperture for controlling the amount of light is connected to one surface of the first lens.
KR10-2001-0022285A 2001-04-25 2001-04-25 Optical system for digital camera KR100390435B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007100453A2 (en) * 2006-02-24 2007-09-07 3M Innovative Properties Company Fresnel field lens
KR100946497B1 (en) * 2007-11-05 2010-03-10 엘지이노텍 주식회사 Optical system
US7701648B2 (en) 2005-09-14 2010-04-20 3M Innovative Properties Company Fresnel lens
CN110441887A (en) * 2019-08-20 2019-11-12 Oppo广东移动通信有限公司 Lens module and mobile terminal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100691267B1 (en) 2005-08-01 2007-03-12 삼성전기주식회사 Lens System For Subminiature Camera Module And IR Cut-Off Lens Used Therefor
KR100869626B1 (en) 2007-05-21 2008-11-21 엘지이노텍 주식회사 Lens system for charge coupled device

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JPS6350185A (en) * 1986-08-20 1988-03-03 Hitachi Ltd Color video camera
JPH0833526B2 (en) * 1988-11-28 1996-03-29 キヤノン株式会社 Photographic lens with optical low-pass filter
JPH09197273A (en) * 1996-01-19 1997-07-31 Minolta Co Ltd Zoom lens
JP3522046B2 (en) * 1996-04-19 2004-04-26 京セラ株式会社 Electronic still camera
JPH1130701A (en) * 1997-05-15 1999-02-02 Minolta Co Ltd Optical system and variable power optical system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7701648B2 (en) 2005-09-14 2010-04-20 3M Innovative Properties Company Fresnel lens
WO2007100453A2 (en) * 2006-02-24 2007-09-07 3M Innovative Properties Company Fresnel field lens
WO2007100453A3 (en) * 2006-02-24 2007-11-08 3M Innovative Properties Co Fresnel field lens
US7684126B2 (en) 2006-02-24 2010-03-23 3M Innovative Properties Company Fresnel field lens
KR100946497B1 (en) * 2007-11-05 2010-03-10 엘지이노텍 주식회사 Optical system
CN110441887A (en) * 2019-08-20 2019-11-12 Oppo广东移动通信有限公司 Lens module and mobile terminal

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