Filter
Top Products
As
with the EOS Digital Rebel model, the EOS Digital Rebel XT camera’s top, front and
r
ear covers are made of special engineering plastic known for light weight, excellent
s
trength and electromagnetic shielding: ABS resin, polycarbonate resin, and
po
lycarbonate mixed with special conductive fibers. The exterior finish is more refined
th
an the EOS Digital Rebel camera’s. The Canon logo is now embossed and colored to
giv
e the XT a high-quality appearance. Both titanium silver and satin black body colors
w
ill be offered.
As with all Canon DSLRs, regardless of price, value is a major
part of the design process. The EOS Digital Rebel XT camera is
made smaller, lighter and more affordable thanks to the following:
• The new, compact shutter, designed especially for the XT, is
optimized for the APS-C sensor size. In turn, the viewfinder
optics, consisting of the mirror box, mirror, focusing screen and so forth,were also
downsized and the optical axis was lowered.
• The compact motor was positioned horizontally thanks to an optimized driving
mechanism for the mirror, shutter and built-in flash.
• There are fewer large parts because the chassis is fitted with more functions.
•
There are fewer connected components because the circuit boards are more highly integrated.
•
New components include the DIGIC II, the timing generator, low pass filter and motor driver.
• There is a new, streamlined sensor manufacturing process and a smaller, thinner
sensor package.
• The new NB-2LH lithium-ion battery pack is both smaller and lighter than the BP-511.
•
Electrical parts in common with the PowerShot family of cameras have been incorporated.
• The shutter release mechanism is the same unit used on the EOS Elan 7E. It provides a
shor
ter time lag (100 milliseconds instead of 120 milliseconds) than the EOS Digital
Rebel camera.
• The XT’s circuit board configuration consists of five hard boards centering on the
digital control circuit board, camera control circuit board, and the DC/DC converter cir-
cuit board. Through various connectors, these boards are linked to 14 flexible circuit
boards. The EOS Digital Rebel camera had the digital control circuit board and camera
control circuit board on one large hard board. To reduce the XT’s size further, the main
board now includes the DC/DC power supply converter circuit.
22III. DISCUSSION
10mm
SDR SDRAM
DIGIC II Image Processor
Flash Circuit Board
Motor Drive Board
External Interface
Connection
Circuit Board
Main board (top)
Main board (bottom)
10mm
SDR SDRAM
DIGIC II Image Processor
Flash Circuit Board
Motor Drive Board
External Interface
Connection
Circuit Board
Main board (top)
Main board (bottom)