Canon fax basic 2000 서비스 매뉴얼

RECORDING SECTION

4–32

4.5

LASER/Scanner Section

Fig. 4-35 shows the basic configuration of the LASER/scanner section.

Fig. 4-35   Configuration of LASER/Scanner Section

The LASER unit turns the LASER beam ON and OFF according to the

LASER drive signal. This LASER beam passes through the collimator lens

and cylindrical lens to be irradiated on the scanning mirror that is rotating

at a fixed speed. After being irradiated on the scanning mirror, the LASER

beam passes through the toric lens and condensing lens to be scanned on

the photosensitive drum. This series of operations is repeated for each line

of the image at a time. The photosensitive drum also rotates at a fixed

speed to prevent lines of the image overlapping each other.

Next, let’s describe the functions of each component.

(1) Collimator lens

The LASER beam emitted from the semiconductor LASER is diffused.

This lens corrects the LASER beam so that it becomes parallel.

Fig. 4-36   Collimator Lens

LASER drive signals
(video signals + LASER ON signal)

Collimator lens

Cylindrical lens

LASER unit

BD mirror

Scanning mirror
(multi-plane mirror)

Scanner motor

Toric lens

Condensing lens

BD circuit board

Reflecting mirror

Photosensitive drum

Semiconductor laser

Collimator lens

LASER beam