Light guide
AssigneePanasonic Intellectual Property Management Co., Lt
InventorsMasaru Fujita, SHOHROH Mochida, Yoshihiko Kanayama, Yusuke Kusaka, Masami Ito, Takanori Kikuchi
Life of this patent
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Abstract
Provided a light guide (11) including side surfaces on which light is incident, a reflection prism surface having plural prisms (12) on which light is reflected, and a light emitting surface from which the light is emitted, in which the reflection prism surface includes a first region (PA) in which a pitch of the prisms (12) varies and a second region (TA) in which a depth of the prisms (12) varies. In the light guide (11), the first region is arranged in the side surface on which the light is incident, and a second region (TA) is arranged adjacent to the first region and in an inward side of the light guide (11).
Claims11
A light guide comprising:
- side surfaces on which light is incident;
- a bottom surface having plural grooves on which the light is reflected;
- and
- an upper surface from which the light is emitted,
- wherein the bottom surface includes a first region in which a pitch of the grooves varies in accordance with a distance from the side surface and a second region in which a depth of the grooves varies in accordance with a distance from the side surface.
Dependencies are inferred from the claim text.