MANUFACTURING METHOD FOR LIGHT GUIDE PLATE, LIGHT GUIDE PLATE, BACK LIGHT DEVICE, ILLUMINATION DEVICE, AND PARTITION PLATE DEVICE
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United States of America Patent
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Issued Date -
Oct 4, 2012
app pub date -
May 26, 2010
filing date -
Dec 3, 2009
priority date (Note) -
Abandoned
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Abstract
It is an object to provide a partition plate device capable of rendering a light guide plate function as a transparent member likewise a window plate and as a light shielding member used as an area light source having a prescribed pattern. The invented partition plate device includes a light guide plate having, on double sides as major surfaces thereof, plural recess pattern scars formed partly melting through vibration of ultrasound under contacting fabrication dots provided in a matrix shape at an ultrasound fabrication horn to major surfaces thereof with pressure; and a light source unit rendering light enter from a side surface of the light guide plate and diffused light occur from the recess pattern scars, wherein the light guide plate functions as a transparent member while no light enters from the light source unit and functions as a light shielding member made of an area light source having a prescribed pattern formed with the recess pattern scars while light enters from the light source unit.
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