• 제목/요약/키워드: Auto-focusing

검색결과 164건 처리시간 0.021초

Auto-Focusing 미세부품 Yoke 조립 자동화 모듈 개발 (Development of automatic assembly module for yoke parts in auto-focusing actuator)

  • 하석재;박정연;박규섭;윤길상
    • Design & Manufacturing
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    • 제13권1호
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    • pp.55-60
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    • 2019
  • Smart-phone in the recently released high-end applied to the camera module is equipped with the most features auto focusing camera module. Also, auto focusing camera module is divided into voice coil motor, encoder, and piezo according to type of motion mechanism. Auto focusing camera module is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. VCM actuator is made of magnet, yoke as a metal, and coil as a copper wire. Recently, the assembly as yoke and magnet is made by human resources. These process has a long process time and it is difficult to secure quality. Also, These process is not economical in cost, and productivity is reduced. Therefore, an automatic assembly as yoke and magnet is needed in the present process. In this paper, we have developed an automatic assembly device that can automatically assemble yoke and magnet, and performed verifying performance. Therefore, by using the developed automatic assembly device, it is possible to increase the productivity and reduce the production cost.

자동 초점 자동 노출 및 자동 화이트 밸런스 비디오 카메라의 설계 및 구현 (Design and Implementation of Auto-Focusing, Auto-Exposure and Auto-White balance Video Camera System)

  • 김병수;이준석;정유영;고성제
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 하계종합학술대회 논문집(4)
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    • pp.17-20
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    • 2001
  • This paper has been studied a vedio camera system with AF (auto-focus), AE (auto exposure), AWB(auto-whitebalance). And then this paper has designed an advanced method to improve AF, AE and AWB video camera system

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비디오 측정 시스템을 위한 효율적인 자동 초점 조절 알고리즘 (An Efficient Auto-focusing Algorithm for Video Measuring System)

  • 한광수
    • 한국정보과학회논문지:소프트웨어및응용
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    • 제32권9호
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    • pp.878-887
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    • 2005
  • 수동형 초점 조절 방식은 카메라를 통해 입력된 영상들을 분석하여 초점을 조절한다. 본 논문에서는 카메라를 이용한 정밀 측정 장비에 효율적으로 적용할 수 있는 수동형 자동 초점 조절 알고리즘을 제안한다. 영상에서 초점값 계산 알고리즘으로 가우시안 필터와 변형된 라플라시안 연산자를 사용한 SMLoG(Sum Modified Laplacian of Gaussian) 방법을 적용하고 초점값들을 이용한 정초점 위치 검색방법으로 가우시안 곡선 정합을 이용한다. 다양한 조명과 대상에 대하여 실험한 결과를 기존의 방법들과 비교하여 제안된 방법의 정확성과 효율성을 검증하였다.

디지털 자동초점을 위한 반복적 Unsharp Mask 필터 (Iterative Unsharp Mask Filter for Digital Auto-Focusing)

  • 신정호
    • 대한전자공학회논문지SP
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    • 제47권5호
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    • pp.145-152
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    • 2010
  • 본 논문에서는 초점 열화를 제거하기 위해서 반복적 Unsharp mask (UM) 필터를 이용한 디지털 자동초점 기법을 제안한다. 제안한 디지털 자동초점 기술은 영상열화를 추정하기 위해서 점확산함수를 추정하지 않고 단순한 필터를 사용하기 때문에 계산량이 적은 장점을 갖는다. 본 기법은 반복적 필터 구조로 영상을 복원하기 때문에 사용자의 주관적 기준 및 영상의 객관적 지표를 사용하여 필터링의 반복 회수를 제한할 수 있다. 또한 반복적 UM 기반의 영상개선 방법이 기존의 반복적 영상복원 기술과 등가임을 보인다. 마지막으로 본 논문에서 제안한 알고리듬의 성능평가를 위해서 기존의 영상복원 기반의 디지털 자동초점 기술과의 비교 실험을 수행하였고, 이를 통하여 제안한 디지털 자동초점 기법이 주관적으로나 객관적으로 우수함을 보였다.

파이버 공초점법을 이용한 레이저 빔 자동 초점 제어 장치에 관한 연구 (Study on Auto Focusing System of Laser Beam by Using Fiber Confocal Method)

  • 문성욱;김종배;김선흠;배한성;남기중
    • 한국레이저가공학회지
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    • 제9권3호
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    • pp.7-13
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    • 2006
  • Auto focusing system to find optimized focal position of laser beam used for material process has been investigated by using fiber confocal method. Wavelength of laser diode (LD) and diameter of single-mode fiber are 780nm and $5.3{\mu}m$, respectively. Intensity distributions of beam reflected from the surface of mirror and silicon bare wafer have been observed in a gaussian form. Experimental results show that focal position obtained by LD is shifted from one observed from surface scribed by laser about $80{\mu}m$. It is due to the difference of wavelength and each divergence of between LD and laser used for material process. It is confirmed that auto focusing control system through position calibration has operated steadily.

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고속 트립토판 자가형광 이미징을 위한 시공간적 집중 기반의 라인 스캐닝 이광자 현미경 개발 (Development of line-scanning two-photon microscopy based on spatial and temporal focusing for tryptophan based auto fluorescence imaging)

  • 이준호;남효석;김기현
    • 한국가시화정보학회지
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    • 제11권2호
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    • pp.41-45
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    • 2013
  • Two-photon microscopy (TPM) is minimally-invasive 3D fluorescence microscopy based on nonlinear excitation, and TPM can visualize cellular structures based on auto-fluorescence. Line-scanning TPM is one of high-speed TPM methods without sacrificing the image resolution by using spatial and temporal focusing. In this paper, we developed line-scanning TPM based on spatial and temporal focusing for auto-fluorescence imaging by exciting the tryptophan. Laser source for this system was an optical parametric oscillator (OPO) and it made near 570 nm femtosecond pulse laser. It had 200fs pulse width and 1.72 nm bandwidth, so that the achievable depth resolution was 2.41um and field of view (FOV) is 10.8um. From the characterization, our system has 3.0 um depth resolution and 12.3 um FOV. We visualized fixed leukocyte cell sample and compared with point scanning system.

파이버 공초점법을 이용한 레이저 빔 자동 초점 제어 장치에 관한 연구 (Study on auto focusing system of laser beam by using fiber confocal method)

  • 문성욱;김선흠;김종배;배한성;남기중
    • 한국레이저가공학회:학술대회논문집
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    • 한국레이저가공학회 2006년도 추계학술발표대회 논문집
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    • pp.41-45
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    • 2006
  • Auto focusing system to find optimized focal position of laser beam used for material process has been investigated by using fiber confocal method. Wavelength of laser diode (LD) and diameter of single-mode fiber we 780nm and $5.3{\mu}m$, respectively. Intensity distributions of beam reflected from the surface of mirror and silicon bare wafer have been observed in a gaussian form. Experimental results show that focal position obtained by LD is shifted from one observed from surface scribed by laser about $80{\mu}m$. It is due to the difference of wavelength and each divergence of between LD and laser used for material process. It is confirmed that auto focusing control system through position calibration has operated steadily.

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가우시안보간과 적응스텝크기를 적용한 하이브리드 오토포커싱 (A Hybrid Automatic Focusing Method with Gaussian Interpolation and Adaptive Step Size)

  • 문순환;김경범
    • 반도체디스플레이기술학회지
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    • 제13권1호
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    • pp.51-55
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    • 2014
  • In this paper, an hybrid automatic focusing method has been proposed for speedy and reliable measurement and inspection in industry. It can improve reliability of focusing position by using not a focusing measure but the hybrid one that is incorporated with sobel operator and auto-correlation. Also, it can not only reduce control time of focusing position using adaptive step size, but also improve accuracy of focusing position by gaussian interpolation. Its performance is verified by experiments. It is expected that it can apply to optical system for measurement and inspection in industry fields.

곡선 서스펜션을 사용한 초소형 VCM 포커싱 구동기 개발 (Development of A Small VCM Focusing Actuator Using Curved Suspensions)

  • 신영철;이승엽
    • 한국소음진동공학회논문집
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    • 제18권1호
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    • pp.11-19
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    • 2008
  • This paper proposes small VCM(voice coil motor) type, auto-focusing and zoom actuators for mobile information devices. In order to meet the large output displacement within small height restriction, the proposed auto-focusing actuator adopts curved suspensions, which are similar to a leaf-spring type suspension of optical disk drives. The sensitivity of design parameters on output displacement and dynamic performance is implemented using ANSYS (3D FEM tool) to determine the optimal geometry and stiffness of the curved suspensions. This paper also investigates a new zoom actuator without a suspension supporting a bobbin. The zoom actuator uses a moving rail and a stoper mechanism by generating rotational force at lens holder. Magnetic flux density of the zoom actuator are calculated by both the FEM and permeance method. Experiments using prototypes of the proposed focusing and zoom models show that both actuators meet the required displacement and performance.