Carriage Operation; Film Carrier Preview Scanning - Epson FilmScan 200 Service Manual

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FilmScan 200

2.1.2 Carriage Operation

Because photo-sensor elements are aligned and have a one-to-one correspondence with a horizontal row

of pixels, no mechanical operation is required for the main scan (one horizontal reading of the original

film). To read more than a single line, however, vertical movement (sub-scanning) is also necessary. This

requires mechanical movement of the scanner head. h other words, scanning is performed by reading one

line at a time, moving in the vertical direction. The operation is illustrated in Figure 2-6.

Main

Scan

The preview motor on the carrier holder unit of the engine drives the film carrier back and forward via

reduction gear. Refer to Figure 2-7.

At the Preview scanning mode, six or four image frames (due to the type of the film carrier) are scanned

at once.

This scanner has an auto-loading function of the film carrier. The status of the carrier and scanning

position where image frame is read are detected by the photo sensor for preview scanning.

Photo Sensor

2-4

Single Pixel

Sub-scan (Real-scan: By carrier holder movement)

(Preview-scan: film carrier movement)

Figure 2-6. Original Film Reading

Figure 2-7. Carrier Holder Unit (Preview scanning block)

Second Line

First Line

Film

Scanner Head

(Optical Unit)

Carrier Holder Unit

Preview motor

Film Carrier

Rev. A

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