| 摘要 |
Provided is an edge light type lighting device that has an anisotropic luminous intensity distribution and can emit light with high luminous intensity. An edge light type lighting device (1) is provided with a light emitting unit (3) on one side surface side of a light guide plate (2). The light guide plate (2) has a plurality of cross-sectional V-shaped recesses (6) parallel to the X axis direction and formed at a prescribed pitch in the bottom surface (2b) thereof and a plurality of cross-sectional lenticular lens shaped protrusions (7) parallel to the Y axis direction and formed at a prescribed pitch in an emission surface (2c) thereof. Light incident to the inside of the light guide plate (2) from the incident end surface (2a) thereof is reflected by inclined surfaces of the cross-sectional V-shaped recesses (6) of the bottom surface (2b), and the vertex angles of the recesses (6) are set such that the light intensity of the emitted light emitted from the emission surface (2c) is maximized in a range of 25 - 65° for an angle with respect to the Z axis direction. |
