Surface light emitting apparatus

摘要

A surface emitting apparatus includes a light guide plate, a plurality of point light sources, a diffusing member, and a spacer member. The light guide plate has an end surface and a light emitting surface and is configured to allow light incident on the end surface to be emitted from the light emitting surface. The plurality of point light sources is provided to oppose the end surface of the light guide plate. The diffusing member is provided on a light emitting surface side of the light guide plate. The spacer member defines a space between the light emitting surface and the diffusing member such that a distance between the light emitting surface and the diffusing member is larger than a thickness of the light guide plate.

主权项

1. A vehicle room lamp including a surface emitting apparatus, said vehicle room lamp comprising:
a light guide plate having an end surface and a light emitting surface and configured to allow light incident on the end surface to be emitted from the light emitting surface; a plurality of point light sources provided to oppose the end surface of the light guide plate; a diffusing member provided on a light emitting surface side of the light guide plate; a spacer member that defines a space between the light emitting surface and the diffusing member such that a distance between the light emitting surface and the diffusing member is larger than a thickness of the light guide plate; a substrate that, with respect to a direction perpendicular to a direction of an extension of the space between the light emitting surface and the diffusing member, extends below the space, the substrate comprising:
a side surface that abuts the spacer member; andan upper surface on which the plurality of point light sources is disposed; a case which stores the light guide plate; a cover attached to an opening portion of the case,
wherein the light guide plate is spaced from the plurality of point light sources,wherein the spacer member defines the space such that an intensity distribution that appears uneven on the light emitting surface is uniform on an outer surface of the diffusing member, whereby the light emitted from the light emitting surface is mixed in the space and is emitted to an exterior via the diffusing member,wherein the spacer member comprises a light-shielding material and is provided as a wall contacting an edge portion of the light emitting surface on an end surface side thereof, thereby blocking light directly applied to the diffusing member from the point light sources,wherein the spacer member overlaps with the edge portion of the light emitting surface on a light incident surface side by a length of a thickness of the spacer member,wherein the spacer member and the case are integrally formed by a light-shielding synthetic resin material,wherein the diffusing member and the cover are integrally formed by a transparent or a translucent synthetic resin material, andwherein a haze value of the diffusing member is set in a range from 90% to 95%; and a plurality of ribs which are provided on a top end side of the spacer member so as to oppose the substrate and which are arranged at positions corresponding to intervals between adjacent point light sources.