Technical Information; Image Sensor - Cmos Sensor - Canon EOS 20D Service Manual

1. TECHNICAL INFORMATION

1.1 Image sensor - CMOS sensor

1) Overview
The large CMOS sensor developed and manufactured by Canon has enabled
the camera to attain the top overall performance in its class. It leads in all the
major performance categories such as high resolution (8.20 effective
megapixels), wide ISO speed range (ISO 100-1600, plus 3200), low noise (less
than the EOS 10D), and high-speed signal reading (5 shots/sec.).
Table 001 CMOS sensor specifications
Effective pixels (approx.)
Total pixels (approx.)
Effective sensor size (mm)
Pixel size (µm)
Color filter
Aspect ratio
2) Wide ISO speed range
With the new technologies explained below, the camera has the same ISO
speed range as the EOS 10D's even though the pixel size is 6.4 × 6.4 µm.
(1) High ISO speeds
A Canon-developed color filter and on-chip microlens are incorporated. By
using a large microlens (the gap between microlenses is about half that of the
EOS 10D), the light-gathering efficiency is enhanced. Also, the photodiode
construction is newly developed and optimized for the CMOS sensor to
increase the sensitivity. Moreover, with the noise-reduction technology
explained in 3), an excellent S/N performance is obtained to provide ISO
1600.
Microlens gap
Null area
Photodiode
EOS 10D
8.20 million: 352002342
8.50 million: 360002360
22.5 × 15.0
6.4 × 6.4
RGB primary color filter
3:2
Fig. 002 Microlens comparison
1
Technical Information
22.5mm
Fig. 001 CMOS sensor (actual size)
EOS 20D