Minolta 7000 - Page 16

6. Summary of AF circuit
In-finder LED
Lens
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Camera
body
pes
Fa
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Lens ROM oo c, _> .
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Mirror
IC,
IC.
IC
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Subject
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IC;
Lens
| Encoder
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AF motor
a
AF coupler
Auto focusing bleck is composed with three ICs (IC6, 7, a).
IC, detects signal from [C; through IC, corresponding to conditions of subject, and calculates in-focus
direction and defecus amount simultaneous with detecting of lens-ROM-information through IC,.
AF motor running direction, running amount, running speed are calculated (selected) according to lens-
ROM- information.
Running direction : determined by in-focus direction
Running amount : determined by pulse corresponding to defocus amount
Running speed” : selected corresponding to defocus amount
Four speeds : No regulation, High speed, Low speed, step
IC, controls AF motor running, through ICy, monitors by encoder (photo interruptor).
AF motor running stops after required pulse, corresponding to IC, calculation, is detected.
AF circuit discriminates whether in-fecus or noi.
@ Operation with exciusive flash mounted
In case that defocus amount is not detected in low light condition, IC, outputs H signal to F,
terminal (flash) + Flash projects AF-assist light -* Camera detects light reflected from subject
and detects defocus amount.