Optical head
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United States of America Patent
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Jan 7, 2014
Grant Date -
May 9, 2013
app pub date -
Mar 15, 2012
filing date -
Nov 9, 2011
priority date (Note) -
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Abstract
Disclosed is an optical head, including a hollow micro-pipe and a stuffing member, the micro-pipe having a diameter-extended portion and a diameter-diminishing portion adapted allowing the incident light to transmit from the diameter-extended portion to the diameter-diminishing portion to emerge from its tip, and the stuffing member being disposed inside of the micro-pipe compared to prior techniques. The optical head of the invention is easier to be made, and it has a better focus for achieving optical exposure of sub-wave length focal spot and deep depth of focus.
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