Device for changing operating force of lens device
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United States of America Patent
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Nov 4, 2014
Issued Date -
N/A
app pub date -
May 27, 2014
filing date -
Nov 28, 2011
priority date (Note) -
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Abstract
An outer tube body of a device for changing operating force is connected to a gear part of a zoom ring of a lens barrel to rotate the outer tube body together with the zoom ring. The outer tube body has a cylindrical shape and includes a hollow part into which an inner tube body whose rotation is restricted is arranged. Grease is interposed in a gap is formed between an inner peripheral surface of the outer tube body and an outer peripheral surface of the inner tube body. A load caused by viscosity resistance of the grease is applied against rotation of the outer tube body together with the zoom ring. The inner tube body can be displaced in a direction of the center axis so that area of a sliding contact region between the outer tube body and the inner tube body is changed.
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