Source: http://www.google.com/patents/US8167476?dq=6289460
Timestamp: 2016-08-24 12:13:56
Document Index: 242252405

Matched Legal Cases: ['Application No. 2007', 'art 31', 'art 8', 'art 8', 'Application No. 2007', 'Application No. 2007', 'Application No. 2007']

Patent US8167476 - Light source device and surface light source device equipped with same - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA light source device comprising: a point light source for emitting light; a light source substrate directly mounting the point light source; a light source substrate cover having a through hole or a notch in a position to which the point light source corresponds, the light source substrate cover arranged...http://www.google.com/patents/US8167476?utm_source=gb-gplus-sharePatent US8167476 - Light source device and surface light source device equipped with sameAdvanced Patent SearchPublication numberUS8167476 B2Publication typeGrantApplication numberUS 12/022,669Publication dateMay 1, 2012Priority dateJan 31, 2007Fee statusPaidAlso published asUS8434925, US8727596, US20080180972, US20120176815, US20130010455Publication number022669, 12022669, US 8167476 B2, US 8167476B2, US-B2-8167476, US8167476 B2, US8167476B2InventorsTakuya Sakamoto, Kenji AritaOriginal AssigneeMitsubishi Electric CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (35), Non-Patent Citations (3), Referenced by (15), Classifications (10), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetLight source device and surface light source device equipped with same
US 8167476 B2Abstract
A light source device comprising: a point light source for emitting light; a light source substrate directly mounting the point light source; a light source substrate cover having a through hole or a notch in a position to which the point light source corresponds, the light source substrate cover arranged opposite to a surface of the light source substrate on which the point light source is mounted; and a support member for supporting the light source substrate, the support member arranged to be opposed to the reverse side of the mounting surface of the light source substrate, the support member has a substantially same size with the light source substrate; wherein the light source substrate cover and the support member sandwich the light source substrate to support the light source substrate.
The present application claims priority from Japanese Patent Application No. 2007-021366, which was filed on Jan. 31, 2007, the disclosure of which is herein incorporated by reference in its entirety.
The present invention relates to a light source device used for illumination of a display device or the like, and a surface light source device equipped with the light source device.
A general display device comprises a display panel, a circuit board, a light source device and the like. A light source device that irradiate slight from the rear surface thereof is either a side light type (edge light type) including a light source on the side surface of an enclosure or a direct type including a light source on the bottom of an enclosure in a position opposed to a display panel.
[Patent Reference 1] JP-A-2006-210183 (Pages 2-5, FIGS. 1-4) [Patent Reference 2] JP-A-2002-229022 (Pages 3-7, FIGS. 1-4) SUMMARY
The invention has been accomplished in order to solve the problems and is capable of efficiently dissipating heat from a light source substrate directly mounting a point light source. The invention provides a light source device capable of firmly fixing a light source substrate and a heat-dissipating part to each other. The invention further provides a surface light source device mounting the light source device having a structure whereby the light source device is readily replaced with spare without breakage or a wire break.
Exemplary embodiments of the invention concerning the configuration of a display device according to the invention and a method for manufacturing the display device will be described referring to drawings. Same signs used across the drawings show substantially the same configuration.
FIG. 1 is an exploded perspective view showing a general configuration of a display device according to the invention. FIG. 2 is a cross-sectional view of the display device in FIG. 1 in an assembled state taken in the direction of arrow A-A. FIG. 3 is an exploded perspective view showing a general configuration of a light source device mounted on the display device according to the invention. FIG. 4 is an enlarged view of main parts of the light source device in an assembled state. FIG. 5 is a cross-sectional view of the light source device in FIG. 4 taken in the direction of arrow B-B.
As shown in FIG. 1 or 2, a numeral 1 represents a box-shaped rear frame 1 having an opening 1 a. A light source device 31 for emitting light is arranged on an inner side surface 1 b as a side surface of the inner wall of the rear frame 1. A reflector 2, which guides light emitted from the light source device 31 toward the opening 1 a, is arranged on the bottom surface 1 c of the inner wall of the rear frame 1. An almost rectangular light guide plate 7 for propagating, in the shape of a plane, light emitted from the light source device 31 is arranged inside the rear frame 1. An incidence surface 7 b as a side surface of the light guide plate 7 is arranged in a position opposite to a light-emitting part 31 a of the light source device 31 from which light is emitted. The rear frame 1 is fitted to a front frame 8 including an opening to provide a surface light source device 32. A display panel 9 and a circuit board 10 for driving and controlling the display panel 9 are arranged on the exit surface of the surface light source device 32. A front frame 11 including an opening 11 a is fitted to the surface light source device 32 to provide a display device 33.
FIG. 11 is an exploded perspective view of a display device showing according to Embodiment 2 of the invention. FIG. 12 is a cross-sectional view of the display device in FIG. 11 in an assembled state taken in the direction of arrow E-E. As shown in FIGS. 11 and 12, a light source device 34 in Embodiment 2 includes a support member 6 arranged on the rear surface 42 of the light source substrate 4 but does not include a light source substrate cover 5 such as one in Embodiment 1 arranged on the surface 41 of the light source substrate 4 mounting point light sources 3. The light source device 34 is fitted to a projection 1 f formed on the rear frame 1 and a recessed part 8 b formed of the rear frame 1 and a front frame 8 to support the light source substrate 4 and the support member 6. Embodiment 2 is different from Embodiment 1 only in that the light source device 34 is fitted to the projection if formed on the rear frame 1 and the recessed part 8 b formed of the rear frame 1 and the front frame 8 to support the light source substrate 4 and the support member 6. The remaining configuration is the same as that of Embodiment 1.
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