
e-STUDIO281c/351c/451c
© 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
LASER OPTICAL UNIT
8 - 6
3) f
θ
lenses 1 and 2
These two lenses perform the following adjustment on the laser beams reflected by the polygonal
mirror.
4) H-Sync signal detection PC board (SNS)
The laser light which is started to be scanned from one of the reflected plane of the polygonal mirror
is reflected by the H-Sync detection mirror and enters the PIN diode on the H-Sync signal detection
PC board (SNS). The primary scanning synchronizing signal is generated based on this reflection.
5) Slit glass
Slit glass is located where the laser beams are output from the laser optical unit, and it protects the
unit from dust.
a. Uniform-velocity scanning
Since the polygonal mirror is rotating at a uni-
form velocity, the laser beam reflected from
the mirror scans over the drum surface at a
uniform angular velocity; namely, the pitch
between the dots on the drum is wider at both
ends than at the center of the scanning range.
The f
θ
lenses help to correct this difference,
making all the dot-to-dot pitches equal on the
drum surface.
Fig. 8-5
b. Face tilt correction
The reflecting face of the polygonal mirror is
tilted slightly to one side against the perfect
vertical. Horizontal deviation of the laser light
which is caused by the tilt is corrected.
Fig. 8-6
c. Sectional shape of laser beam
The shape of the laser beam spotted on the
drum is adjusted.
Wider
Narrower
Drum
f Lens-1
f Lens-2
Same intervals
Mirror plane is tilted.
Deviation
Содержание e-studio281c
Страница 6: ......
Страница 106: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved COPY PROCESS 3 16 ...
Страница 126: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved GENERAL OPERATION 4 20 ...
Страница 172: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved SCANNER 6 28 ...
Страница 182: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved IMAGE PROCESSING 7 10 ...
Страница 316: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved REVOLVER UNIT 13 14 ...
Страница 336: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved TRANSFER UNIT 14 20 ...
Страница 342: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved IMAGE QUALITY CONTROL 15 6 ...
Страница 398: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved AUTOMATIC DUPLEXING UNIT ADU 17 20 ...
Страница 408: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved PC BOARDS 19 2 2 PWA F LGC Fig 19 2 ...
Страница 412: ...e STUDIO281c 351c 451c 2005 2008 TOSHIBA TEC CORPORATION All rights reserved PC BOARDS 19 6 11 PWA F FIL Fig 19 11 ...
Страница 413: ......
Страница 414: ......