Original Size Detecting Section - Minolta CF910 Service Manual

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1154SBM0908A

Original Size Detecting Section

1. Original Size Detecting Sensors

• A multibeam sensor is used for the Original Size Detecting Sensors (SE1 to SE4).

• A multibeam sensor consists of a light emitter and a photosensor.

• The light emitter employs an optical device called the grating that diffracts the light emit-

ted by the LED (infrared) into three beams.

• If no grating is used, only one light beam is emitted.

• Three photodiodes, used as the photosensor, detect an original.

(Original present: L; original not present: H).

Sensor Types

There are three types of sensors according to the number of beams and the distances of

detection and non-detection from the sensor top surface.

[For the layout of each sensor, see "3. Determining Original Size" that follows.]

No. of Beams

Detection Distance

Non-Detection Distance

Photoreceiver Lens

Projection Lens

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