TW256902B - Method for fixed focus CCD imaging - Google Patents
Method for fixed focus CCD imagingInfo
- 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
Links
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Image Input (AREA)
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI393060B (en) * | 2004-12-08 | 2013-04-11 | Symbol Technologies Inc | Pulsed illumination in imaging reader |
-
1994
- 1994-05-04 TW TW83104043A patent/TW256902B/en active
Cited By (1)
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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