Spread illumination apparatus having trapezoidally-shaped grooves
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 11, 2003
Grant Date -
Jan 3, 2002
app pub date -
Jun 26, 2001
filing date -
Jul 3, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a spread illuminating apparatus for improving the machinability and durability of a molding die for a transparent substrate and obtaining an excellent light reflection. In a light reflection pattern comprising grooves and substantially flat portions adjacent to the grooves and formed on an upper surface of the transparent substrate in parallel to the optical axis of a bar-like light conductive member located close to an end surface of the transparent substrate, the grooves are each formed substantially trapezoidal in section with their bottom surface defining a shorter side of trapezoid. The inclination angle of an inclined surface positioned closer to a light source is set to range between 35.degree. and 55.degree., the inclination angles of both the substantially flat portions and the bottom surfaces are set to range between -5.degree. and +5.degree., the width of the substantially flat portions is set to be constant, and the width and depth of the grooves gradually increase in proportion to the increase in distance from the light source.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully