Abstract

Abstract: Modified testing equipment for adjusting the back focal length of a compact camera module (CCM) is proposed. The advantages of this modified testing equipment which includes a conversion lens are that it saves on testing space, offers a smaller sized testing chart, as well as high speed chart changing, and variable object distances. The modified testing equipment can produce a test chart of 38.32 mm compared to an equivalent testing chart of 5000 mm with the conventional testing equipment. At the regular object distance of 2000 mm, both total track and testing chart size for the modified test equipment were 8.3% that of the conventional testing equipment. By using this testing equipment, the testing space can be shrunk significantly.

© 2012 OSA

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References

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2009 (1)

2008 (1)

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Appl. Opt. (1)

Opt. Express (2)

Other (17)

J. W. Pan, “The first order optics of novel testing equipment for compact camera module,” IODC (OSA 2010) paper JMB25 (2010).

W. J. Smith, “Stops, apertures, pupils and diffraction,” in Modern Optical Engineering, 4th ed. (Mc-Graw Hill, 2008), pp. 182–183.

Largan Precision Co, Ltd. “Conventional compact camera module specification,” http://www.largan.com.tw/html/product/product_cellphone_en.aspe

W. J. Smith, “Scanner/f-?, laser disk and collimator lenses,” in Modern Lens Design, 2nd ed. (Mc-Graw Hill, 2005), pp. 561–571.

M. Laikin, “F-theta scan lenses,” in Lens Design, 4th ed. (CRC Press, 2007), 245–252.

R. E. Fischer, B. Tadic-Galeb, and P. R. Yoder, “Hardware design issue,” in Optical System Design, 2nd ed. (Mc-Graw Hill, 2008), pp. 594–595.

G. C. Holst, “Sampling theory,” in Electro-Optical Imaging System Performance, 4th ed. (SPIE, 2006), pp 72–87.

B. Hayashida, “F-theta lens system for four-group construction,” U.S. patent 4400063 (Aug 23, 1983).

K. Fuse, “F-theta lens,” U.S. patent 6324015 (Nov 27, 2001)

W. J. Smith, “Optical computation,” in Modern Optical Engineering, 3rd ed. (McGraw- Hill, 2000), pp. 301–346.

M. J. Kidger, “Principles of lens design,” in Fundamental Optical Design (Mc-Graw Hill, 2001), pp. 158–159.

M. J. Kidger, “Principles of lens design,” in Fundamental Optical Design (Mc-Graw Hill, 2001), pp. 150–151.

J. M. Geary, “Lens splitting,” in Introduction to Lens Design with Practical ZEMAX Examples (Willmann-Bell, 2001).

R. E. Fischer, B. Tadic-Galeb, and P. R. Yoder, “Hardware design issue,” in Optical System Design, 2nd ed. (Mc-Graw Hill, 2008), pp. 675–677.

Omni Vision Technologies, Inc., http://www.ovt.com/

W. J. Smith, “Stops, the practice of optical engineering,” in Modern Optical Engineering, 4th ed. (Mc-Graw Hill, 2008), pp. 620–622.

IEEE resolution target chart, Spring Master Source Book (Edmund Optics, 2011), p. 363.

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Figures (8)

Fig. 1
Fig. 1

Conceptual representation of the novel CCM test equipment layout.

Fig. 2
Fig. 2

Optical layout of the conversion lens design.

Fig. 3
Fig. 3

Relationship between real object distance and virtual image distance for the conversion lens design.

Fig. 4
Fig. 4

Field curvature and optical distortion of the conversion lens.

Fig. 5
Fig. 5

MTF diagraph of the converstion lens for an virtual image distance of (a) infinity and (b) 300 mm.

Fig. 6
Fig. 6

MTF value Tolerance diagaph.

Fig. 7
Fig. 7

Photograph of the conversion lens sample.

Fig. 8
Fig. 8

(a) Shows the center (a) and corner (c) CCM images obtained with the conversion lens, and the center (b) and corner (d) CCM images obtained without the conversion lens.

Tables (3)

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Table 1 Specifications of Conversion Lens

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Table 2 Pixel Size at CCM Sensor and Image Pixel Size after Passing through Conversion Lens (Typical EFL of CCM is 3mm and EFL of Conversion Lens is 78mm)

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Table 3 Tabulation of Precision Optical Fabrication Tolerances

Equations (2)

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h= f conversion tan( θ conversion 2 ),
M= f conversion tan( θ conversion 2 ) f ccm tan( θ ccm 2 ) = f conversion f ccm ,

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