Patent ID: 8083391
Filing Date: 2011-12-27
Classification: G02B

Abstract:
1. A planar light source comprising: (a) a light guide plate for guiding light to exit from an exit plane of the light guide plate; (b) three lamps arranged along one side plane of the light guide plate; (c) a lamp reflector which is formed so as to cover the three lamps and which guides light emitted from the three lamps toward the one side plane of the light guide plate, wherein: (d) the three lamps are arranged while being kept away from each other at predetermined intervals; (e) two of the three lamps are arranged in close proximity to the one side plane of the light guide plate; (f) a distance between centers of the two lamps in a direction parallel to the one side plane of the light guide plate is L (g) the third lamp is arranged farther away from the one side plane of the light guide plate than the two lamps and between the two lamps in the direction parallel to the one side plane of the light guide plate; (h) the lamp reflector is continually formed so as to become close to the three lamps and surround the respective three lamps; (i) the lamp reflector has a substantially convex cross-sectional shape that forms three vertical planes, each vertical plane adjacent a different lamp; (j) the three lamps are spaced away from their respective plane in the direction perpendicular to the one side plane of the light guide plate by a distance of L (k) the third lamp is spaced under a first horizontal plane of the lamp reflector in the direction parallel to the one side plane of the light guide plate by distance L wherein L (l) the third lamp is spaced above a second horizontal plane of the lamp reflector in the direction parallel to the one side plane of the light guide plate at a distance less than L