Physical Properties And Layout Of Electrical Components - Canon A-1 Repair Manual

(11) Energy-saving Camera Design
When designing the A-l, every effort was made to
reduce the power consumption. The result of these
efforts is that the battery last for 15,000 'operations ,
or about a year of normal use . The following items
contribute to the low power consumption.
1) To apply the electric current to parts which
really need the power at needed time by controlling
the circuitry in sequence.
2) Adoption of the LSI which contains the pure I2L,
a refined version of the ordinary I2L
3) Employment of the dynamic drive system for the
.diplay circuitry
4) Adoption of the "hybred magnet", a combination of
the permanent magnet and the electromagnet
4.5 Physical Properties and Layout of Electrical Components
(1) Double-side micro pattern circuit boards
In the A-l, this flexible board is of multilayer
construction with patterns on both sides. What's
more, the minimum distance between lines and the
minimum line width are 0.2 mm . This is a figure
close to the limit obtainable by present techniques.
(2) Circuit Board Layout and interconnection
Figure 18 shows the block diagram of the circuit boards,
and figure 19 shows a pictorial view.
On the top deck are positioned the main flexible board
(IC for CPU, IC for information input, oscillator/
interface IC, IC for metering, etc.), SV board (diode
array, film speed information input switch), At
flexible board (self timer, power source switch) and
AT board (At and TV information input switch).
In the front panel of the body are positioned the DO
flexible board (includes decoder driver indicator),
AVO flexible board (for detecting maximum aperture
opening f-number of the lens), and SAVE plate (to be
explained later).
Of these, two-side flexible circuit boards are used
for the main and DO flexible boards. The SAVE plate
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