Exposure Lamp - Toshiba e-STUDIO 200L Service Manual

6.4.2

Exposure lamp

An external electrode type xenon fluorescent lamp is used as the exposure lamp in this equipment.
1) Structure
Fluorescer is applied on the internal surface of the lamp pipe (except a part to be an opening) which
is filled with xenon gas.
A pair of the external electrodes covered by film with the adhesive agent is attached over the pipe.
PET film
Aluminum tape
electrode
Adhesive agent, PET, film
2) Behavior inside the lamp
Electrons inside the pipe are led to the electric field by applying voltage to a pair of the external elec-
trodes, and discharging starts. The electrons then flow and clash with a xenon atom inside the pipe
to excite it, and generate an ultraviolet ray. This ultraviolet ray converts the fluorescer into visible
light.
( 7 )
( 1 ) Electrode ( 2 ) Electron ( 3 ) Xenon atom ( 4 ) Ultraviolet ray ( 5 ) Fluorescer
( 6 ) Visible light ( irradiated from the opening to outside the pipe )
( 7 ) Opening ( 8 ) Harness
June 2004 © TOSHIBA TEC
Fig. 6-10
( 6 )
( 5 )
( 2 )
( 4 )
( 3 )
Fig. 6-11
6 - 9
Glass valve
Fluorescer
Xenon gas
( 1 )
( 8 )
e-STUDIO200L/202L/230/232/280/282 SCANNER
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