• Title/Summary/Keyword: Auto-focusing

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

  • Ha, Seok-Jae;Park, Jeong-Yeon;Park, Kyu-Sub;Yoon, Gil-Sang
    • Design & Manufacturing
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    • v.13 no.1
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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.

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

  • 김병수;이준석;정유영;고성제
    • Proceedings of the IEEK Conference
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    • 2001.06d
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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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An Efficient Auto-focusing Algorithm for Video Measuring System (비디오 측정 시스템을 위한 효율적인 자동 초점 조절 알고리즘)

  • Hahn Kwang-Soo
    • Journal of KIISE:Software and Applications
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    • v.32 no.9
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    • pp.878-887
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    • 2005
  • The passive focusing method finds the in-focus position by analyzing images captured by a camera. In this paper, we propose an efficient passive auto-focusing algorithm for video measuring systems. The sum of modified Laplacian of Gaussian is used to calculate focus values from images and Gaussian curve fitting is applied to estimate the optimal in-focus position. The Proposed method is tested for various objects and illuminations. The test result is compared with other methods to verify accuracy and efficiency of the proposed algorithm.

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

  • Shin, Jeong-Ho
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.47 no.5
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    • pp.145-152
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    • 2010
  • This paper presents a digital auto-focusing algorithm using iterative unsharp mask filter. The proposed digital auto-focusing algorithm has the advantage of low computational complexity because it uses a simple filter instead of calculating the point spread function for the estimation of image degradation. The proposed iterative algorithm can control the number of iterations for image restoration according to the objective and the subjective criterion. We show that the proposed algorithm is mathematically equivalent to the conventional image restoration. Finally, in order to evaluate the performance of the proposed algorithm, various experiments are performed so that the proposed algorithm can provide good results in the sense of subjective and objective views.

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

  • Moon, Seong-Wook;Kim, Jong-Bae;King, Sun-Hum;Bae, Han-Seong;Nam, Gi-Jung
    • Laser Solutions
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    • v.9 no.3
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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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Development of line-scanning two-photon microscopy based on spatial and temporal focusing for tryptophan based auto fluorescence imaging (고속 트립토판 자가형광 이미징을 위한 시공간적 집중 기반의 라인 스캐닝 이광자 현미경 개발)

  • Lee, Jun Ho;Nam, Hyo Seok;Kim, Ki Hean
    • Journal of the Korean Society of Visualization
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    • v.11 no.2
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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.

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

  • Moon, Seong-Wook;King, Sun-Hum;Kim, Jong-Bae;Bae, Han-Seong;Nam, Gi-Jung
    • Proceedings of the Korean Society of Laser Processing Conference
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    • 2006.11a
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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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A Hybrid Automatic Focusing Method with Gaussian Interpolation and Adaptive Step Size (가우시안보간과 적응스텝크기를 적용한 하이브리드 오토포커싱)

  • Moon, Soon Hwan;Kim, Gyung Bum
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.1
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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.

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

  • Shin, Young-Chul;Lee, Seung-Yop
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.1
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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.