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Browse Prior Art Database

Scanner for Multiplexing Images Onto Individual Photodiodes

IP.com Disclosure Number: IPCOM000084404D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Queener, CA: AUTHOR

Abstract

Fig. 1 is a schematic representation of scanning apparatus for line scanning a document 10. As the document 10 moves to the left, successive lines across the document are projected by lens 12 onto a diode array 14. As Fig. 1 is a side view, only the end of the diode array 14 and the edge of the document 10 are represented.

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Scanner for Multiplexing Images Onto Individual Photodiodes

Fig. 1 is a schematic representation of scanning apparatus for line scanning a document 10. As the document 10 moves to the left, successive lines across the document are projected by lens 12 onto a diode array 14. As Fig. 1 is a side view, only the end of the diode array 14 and the edge of the document 10 are represented.

To perform the line scan the appropriate area of the document 10 is illuminated by lamps 16. Light from lamps 16 reflects from the document surface through the slit aperture 18 to the lens 12. Lens 12 projects the line through a rotary mask 20 rotating about axis 22 onto the linear diode array 14.

Each of the diodes in the diode array 14 is of a size sufficient to receive light from four incremental areas in the line scan. The mask 20 has a pattern to multiplex these four incremental areas so that each diode in the array sees only one incremental area of the original document at a given time.

Fig. 2 shows a very small portion of the mask 20 with its fine pattern. The dimensions of one diode in the array 14 under a mask are indicated on Fig. 2. The DL represents the length of the diode and the DW the width of the diode. Accordingly, as the rotary mask 20 rotates (Fig. 1), the mask pattern (Fig. 2) multiplexes four incremental areas of the line scan onto a single diode in the linear diode array 14.

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