BenQ 2720S Service Guide - Page 21

Optic Relation, 1.3 Receiving

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f IMAGE OBJECT q p Figure 4-3 Optic Relation Note: The lens is fixed by a hex screw in the carriage as shown in Figure 4-1. If you loosen the hex nut, then you can adjust the lens, and the object distance is changed. When the object distance is changed, the image distance changes according to the formula. At this moment, the image cannot accurately forms on the CCD, and the quality and resolution of scanner will be influenced. In order to keep high quality and resolution of the scanner, never try to loosen the hex screw and adjust the lens position. 4.1.3 Receiving A color CCD (charge coupled device) is applied here. It is fixed on a CCD board, as shown in Figure 4-1. The CCD is sensitive only to the intensity of the light. It will output voltage signals while the light shines. Note: The position of color CCD is mounted on a board, its position has been precisely calibrated for every scanner. The CCD board is fixed in lens-box by two screws as shown in Figure 4-1. Any deviation will seriously affect the output voltage of CCD and resulting in bad resolution for the scanner. Mechanism API Confidential 4-7 No Copy/Reproduction allowed

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f
p
q
IMAGE
OBJECT
Figure 4-3 Optic Relation
Note:
The lens is fixed by a hex screw in the carriage as shown in Figure
4-1. If you loosen the hex nut, then you can adjust the lens, and the
object distance is changed. When the object distance is changed, the
image distance changes according to the formula. At this moment,
the image cannot accurately forms on the CCD, and the quality and
resolution of scanner will be influenced. In order to keep high quality
and resolution of the scanner, never try to loosen the hex screw and
adjust the lens position.
4.1.3 Receiving
A color CCD (charge coupled device) is applied here. It is fixed on a CCD
board, as shown in Figure 4-1. The CCD is sensitive only to the intensity
of the light. It will output voltage signals while the light shines.
Note:
The position of color CCD is mounted on a board, its position has
been precisely calibrated for every scanner. The CCD board is fixed in
lens-box by two screws as shown in Figure 4-1. Any deviation will
seriously affect the output voltage of CCD and resulting in bad
resolution for the scanner.
Mechanism
API Confidential
4-7
No Copy/Reproduction allowed