Device for controlling the amplitude of a swinging body
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United States of America Patent
Stats
-
Nov 9, 2004
Grant Date -
Mar 27, 2003
app pub date -
Sep 26, 2002
filing date -
Sep 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for controlling the amplitude of a swinging body. The device accurately controls the drive thereof in response to the load the swinging body carries even if it carries infants of different weights. A desired swing is provided by a sensor portion which generates first and second pulse signals having different phases in response to the swing and a control circuit which obtains sensor data based on the first pulse signal and the second pulse signal, decodes data patterns set in advance which corresponds to a combination of the sensor data, judges a swing direction or a change thereof from a changed pattern of the continuous data patted, reads a target value (pulse count number) set in advance to compare or the like with the pulse count number of the present, the previous, and the one before the previous to obtain a pulse width for driving at the next timing, and outputs a drive pulse of the obtained pulse width to a drive circuit so that driving can be performed in accordance with the expected value of the swing set in advance.
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