5) Saving power
To minimize the increase in power consumption due to the high-speed, 4-
channel reading, the output amp's power consumption is kept to an absolute
minimum.
Also, as with the EOS 10D and EOS-1Ds during long exposures, power to the
output amp is cut off. And as with the EOS-1D Mark II, the circuit-driving
standard current is also cut off. Less power is thereby consumed.
6) Infrared-blocking, low-pass filter
The EOS 20D's infrared-blocking, low-pass
filter has the same construction as the EOS
10D's filter with infrared-absorbing glass and
three crystal plates having a different optical
axis.
The infrared-blocking, low-pass filter has a
dichroic mirror made of a dielectric, multi-layer
coating (in front of the low-pass filter) that
deflects light which has a wide infrared
wavelength. It also has an infrared-absorbing
glass layer to absorb near-infrared wavelengths
in the visible spectrum. This hybrid
construction consisting of deflecting and
absorbing layers reduces the red ghosting
caused by sensor reflections and image fogging.
The low-pass filter consists of two crystal
monocrystal plates that separate the subject
image into four horizontal and vertical
directions. In-between these two plates is a
phase plate (crystal monocrystal plate) that
converts the linear polarized light into circular
polarized light. The first crystalline plate
separates the image into two images horizontally. The light flux that becomes
the orthogonal linear polarized light is converted into circular polarized light by
the phase plate. The second crystal plate separates the images vertically,
resulting in four images square. The image separation in the horizontal and
vertical directions is optimized for the sensor pitch so that false colors caused by
minute horizontal and vertical lines are reduced.
Technical Information
3
Low-pass filter
(Separates image in
vertical direction)
Low-pass filter
(Separates image in horizontal
direction)
Phaser layer
(Converts linear polarized
light into circular polarized
light)
CMOS
sensor
Dichroic mirror
(Reflects infrared rays)
Infrared-absorbing glass
Fig. 004 Cross section of infrared cut, low-
pass filter
Содержание EOS 20D Digital
Страница 1: ...e ...
Страница 2: ...EOS 20D SERVICE MANUAL Copyright 2004 Canon Inc ...
Страница 116: ... MEMO Repair Information 9 ...
Страница 119: ...2 2 Front Cover Removal Repair Information 12 Fig 024 1 Grip Rubber 2 Front Cover 3 Main Battery Cover 2 2 2 1 ...
Страница 140: ...Repair Information 33 MEMO ...
Страница 141: ...2 9 Top Cover Ass y Disassembly Repair Information 34 Fig 111 3 1 1 1 1 1 3 4 2 ...
Страница 155: ...Copyright 2004 Canon Inc Parts Catalog ...
Страница 156: ......
Страница 157: ...PARTS CATALOG EOS 20D REF No C12 6061 ...
Страница 177: ...VIDEO CABLE VC 100 REF NO FH 3922 NEW PARTS No CLASS QTY DESCRIPTION Pg 10 FH6 3922 000 000 C 1 VIDEO CABLE VC 100 ...
Страница 184: ... CANON INC 2004 2 BLOCK DIAGRAM 2 1 GENERAL REF NO C12 6061 01 SEP 2004 ...
Страница 185: ... CANON INC 2004 2 2 POWER SUPPLY REF NO C12 6061 01 SEPT 2004 ...
Страница 189: ...REF NO C12 6061 3 PCB DIAGRAM 3 4 C D FPC 01 SEP 2004 CANON INC 2004 SIDE A SIDE B C D C D 0 0 0 ...
Страница 199: ...REF NO C12 6061 3 PCB DIAGRAM 3 14 IR SENSE FPC 01 SEP 2004 CANON INC 2004 SIDE A SIDE B 1 2 CH1 8250 IR 000 SPDX AGND ...
Страница 224: ...SI CHART FOR 20D ...
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