Fabrication of MTF measurement system for a mobile phone lens using multi-square objects

Sung Mok Hong; Jae Heung Jo; Hoi Youn Lee; Ho Soon Yang; Yun Woo Lee; In Won Lee

doi:10.1117/12.783498

27 November 2007 Fabrication of MTF measurement system for a mobile phone lens using multi-square objects

Sung Mok Hong, Jae Heung Jo, Hoi Youn Lee, Ho Soon Yang, Yun Woo Lee, In Won Lee

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 67233C (2007) https://doi.org/10.1117/12.783498
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

The mobile phone market grows rapidly and the performance estimation about camera module is required. Accordingly, we fabricate the MTF measurement system for a mobile phone lens having extremely small diameter and large f-number. The objective lens with the magnification of X20 for MTF measurement for high resolution lens and a detector of CCD that is pixel size of 7.4 um are adapted to the system. Also, the CCD is translated by using a linear motor to reduce measurement errors. The measurement lens is placed at the most suitable imaging point by a precise auto-focusing motor. The measuring equipment which we developed for off-axis MTF measurement of a mobile phone lens used the multi-square objects. The square objects of measuring equipment are arranged a unit in the on-axis and total 12 units (0.3 field: 4 units, 0.5 field: 4 units, 0.7 field: 4 units) in the off-axis. When the measurement is started, the linear motors of signal detection part are transferred from on-axis to off-axis. And a detected signals from the each square objects are used for MTF measurement. System driver and MTF measure are using application program that developed us. This software can be measure the on-axis and the off-axis sequentially. In addition to that it did optimization of motor transfer for measurement time shortening.

Citation Download Citation

Sung Mok Hong, Jae Heung Jo, Hoi Youn Lee, Ho Soon Yang, Yun Woo Lee, and In Won Lee "Fabrication of MTF measurement system for a mobile phone lens using multi-square objects", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67233C (27 November 2007); https://doi.org/10.1117/12.783498

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KEYWORDS

Modulation transfer functions

Cell phones

Sensors

Optical transfer functions

Signal detection

Cameras

CCD image sensors

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