Toshiba e-STUDIO2500c Service Manual page 140

[ 2 ] Exposure lamp
External electrode type xenon fluorescent lamp is used as an exposure lamp in this equipment.
1) Structure
Fluorescer is applied on the inside surface of the lamp pipe (except a part to be an opening) which is
filled with the xenon gas.
A pair of the external electrodes covered by the film with the adhesive agent is attached over the
pipe.
PET film
Aluminum tape
electrode
Adhesive agent, PET, film
2) Behavior inside the lamp
The electron inside the pipe is led to the electric field by applying voltage to the pair of the external
electrodes, and discharge is started. Electrons then flow and clash with the xenon atom inside the
pipe to excite them, and generate the ultraviolet ray. This ultraviolet ray converts the fluorescer into
the visible light.
e-STUDIO2500c/3500c/3510c SCANNER
( 5 )
( 7 ) ( 2 )
( 1 ) Electrode ( 2 ) Electron
( 4 ) Ultraviolet lay ( 5 ) Fluorescer
( 6 ) Visible light ( irradiated from the opening to outside the pipe )
( 7 ) Openig ( 8 ) Harness
Xenon gas
Fig. 6-10
( 6 )
( 4 )
( 3 )
( 3 ) Xenon atom
Fig. 6-11
6 - 10
Glass valve
Fluorescer
( 1 )
( 8 )
May 2006 © TOSHIBA TEC