Canon EOS EOS 30D Witboek - Pagina 19

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camera more comfortable to grasp.

The EOS 30D's basic internal construction and major parts configuration are the same

as those of the EOS 20D. However, parts count data reveal the extent to which the

EOS 30D has been reconsidered. The number of circuit boards, 28, is the same as in

the EOS 20D, but lead wires have been reduced from 19 to 15. Optical parts count is

the same, 20, but mechanical parts have risen from 301 to 338 and electrical parts

have risen from 826 to 898. Screws and washers have declined slightly, from 167 to

164. In this tally, the shutter unit and DC/DC converter each count as one unit and the

E-ring counts as a washer. It is clear from this and from the following discussion that

the EOS 20D got a thorough going-through and that extensive changes have been made

to enhance mechanical and electrical reliability, reduce sources of noise and improve

overall performance.

The EOS 30D's basic circuit board configuration is based on the EOS 20D's. There are

six rigid, printed boards centering on the digital control and camera control circuit

boards, and 22 flexible printed boards on which the sensor and switches are mounted.

It is different from the EOS 20D in that the 2.5-inch TFT monitor is incorporated;

adaptation has been made for a different AE sensor package and soldering by hand has

been eliminated.

The digital control circuit board is a highly integrated 10-layer board. It contains the

following: the ADIC that converts the output from the CMOS sensor into digital signals,

the imaging signal processing circuit that includes the IC that generates the CMOS sensor's

drive pulse, the digital imaging processing circuit that includes the DiG!C II, the memory

circuit that includes the DDR SDRAM for the image buffer memory, and other items such

as the TFT liquid-crystal control circuit. The board's number 2 and 9 layers are GND

layers to prevent signal interference between the external-layer pattern and the

internal-layer pattern and to prevent undesirable phenomena caused by noise.

The camera control circuit board has six layers. It contains the following: the main

microcomputer IC that regulates the camera's operation by controlling the various sensors

and mechanical components, the display panel and viewfinder display drive control, the

display microcomputer IC that controls various switches and the EEPROM that retains

adjustment data (AE, AF, etc).

Flash circuit board

External interface

connection circuit board

V. PERFORMANCE, DESIGN AND CONSTRUCTION

Power source circuit board

Digital control

Camera control

circuit board