TW256902B - Method for fixed focus CCD imaging - Google Patents

Method for fixed focus CCD imaging

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Publication number
TW256902B
TW256902B TW83104043A TW83104043A TW256902B TW 256902 B TW256902 B TW 256902B TW 83104043 A TW83104043 A TW 83104043A TW 83104043 A TW83104043 A TW 83104043A TW 256902 B TW256902 B TW 256902B
Authority
TW
Taiwan
Prior art keywords
optical components
optical
appropriate
reading
selection
Prior art date
Application number
TW83104043A
Other languages
Chinese (zh)
Inventor
R Roustaei Alexander
Original Assignee
R Roustaei Alexander
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by R Roustaei Alexander filed Critical R Roustaei Alexander
Application granted granted Critical
Publication of TW256902B publication Critical patent/TW256902B/en

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Abstract

Methods are provided to assist in selection of appropriate optical components for optimizing performance of the optical scanner for reading one-, two- and three-dimensional optically encoded information at a wide range of field depths and angles. The optical components are fixed in position relative to each other so that no position adjustments are required to obtain a reading at a desired distance once the optical components are optimized. Among the parameters that are considered are LEDs for emitting light within specific wavelength ranges, optical filters, lens focal lengths, magnification, etc. The fourier transform of an input square wave signal generated by light reflected from a bar code is used to generate the appropriate resolution requirements. Selection of appropriate optical components is dependent upon the intended operation of the scanner. For example, depth of field is considered, as is scan angle and density of the code to be read. The performance models are based upon the modulation transfer function (MTF) of the optical system, comprising the encoded information, the lens system and the CCD array.
TW83104043A 1993-05-07 1994-05-04 Method for fixed focus CCD imaging TW256902B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5932293A 1993-05-07 1993-05-07

Publications (1)

Publication Number Publication Date
TW256902B true TW256902B (en) 1995-09-11

Family

ID=51401672

Family Applications (1)

Application Number Title Priority Date Filing Date
TW83104043A TW256902B (en) 1993-05-07 1994-05-04 Method for fixed focus CCD imaging

Country Status (1)

Country Link
TW (1) TW256902B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI393060B (en) * 2004-12-08 2013-04-11 Symbol Technologies Inc Pulsed illumination in imaging reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI393060B (en) * 2004-12-08 2013-04-11 Symbol Technologies Inc Pulsed illumination in imaging reader

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