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In addition to a "four-chemical emitting element" which suppresses changes in the light emitting element over time so that a stable level of light emission can be maintained over long periods, a "APC (Auto Power Control) circuit" has also been adopted afresh. The light emitting amount can be controlled in minute degrees so that even changes occurring over very short periods can be handled, allowing stable sensing performance by suppressing deviations in light emitting amounts caused by changes in the ambient environment that could not previously be suppressed. Ultra high-speed 35 µs response. Even small objects moving at high speeds can be sensed. In addition, at 65 µs Panasonic FX-301 standard type and Panasonic FX-305 high-function type is also twice as fast as previous models.
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