Plane scroll spring and curtain driving device
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United States of America Patent
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Sep 15, 2020
Grant Date -
N/A
app pub date -
May 30, 2019
filing date -
May 30, 2019
priority date (Note) -
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Abstract
An embodiment of the present invention provides a plane scroll spring. A torque provided by a working section of a reed of the plane scroll spring is gradually reduced from an outer ring toward an inner ring of the plane scroll spring. The working section includes a first length section and a second length section connected to an inner end of the first length section. In the first length section, the torque decreases by a first decrement value per unit length from the outer ring toward the inner ring. In the second length section, the torque decreases by a second decrement value per unit length from the outer ring toward the inner ring. The first decrement value is less than the second decrement value.
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