Light guide member for light emission device and light emission device

1 . A light emission device, comprising:

a light source; and

a lightguide component having a first principal face and a second principal face that is at an opposite side from the first principal face, the lightguide component including:

a lightguide layer including a light-receiving portion that receives light emitted from the light source, the lightguide layer further including a third principal face and a fourth principal face, wherein the third principal face is positioned closer to the first principal face side than a position of the fourth principal face to the first principal face side;

a light distribution controlling structure having a plurality of internal spaces, the plurality of internal spaces creating interfaces to direct a portion of the light propagating in the lightguide layer toward the first principal face via total internal reflection, wherein,

in a plan view from a normal direction of the first principal face, a first region in which the light distribution controlling structure is present and a second region in which the light distribution controlling structure is not present are disposed so as to define a predetermined design;

a textured film that includes a fifth principal face having a plurality of recesses that define the plurality of internal spaces, wherein,

the plurality of recesses include: a plurality of first recesses which are located in the first region and which are not buried; and a plurality of second recesses which are located in the second region and which are substantially buried;

a base layer provided vertically below the textured film;

an adhesive layer disposed at the fifth principal face side of the textured film so as to be positioned vertically above both the base layer and the textured film, wherein the adhesive layer is positioned vertically below the lightguide layer,

wherein, the plurality of first recesses are not buried by the adhesive layer, and wherein the plurality of second recesses are substantially buried by the adhesive layer;

the plurality of internal spaces is defined by the plurality of first recesses in the textured film;

wherein the light source is positioned vertically higher than the adhesive layer; and

with respect to a plan view of the lightguide component, the adhesive layer overlaps substantially the entire lightguide layer.

2 . The light emission device of claim 1 , wherein the plurality of internal spaces are formed in a redirection layer that is provided at the third principal face side or the fourth principal face side of the lightguide layer.

3 . The light emission device of claim 2 , further comprising a light coupling layer provided between the lightguide layer and the redirection layer, wherein the light coupling layer includes a plurality of low-refractive index regions that have a refractive index smaller than a refractive index of the lightguide layer.

4 . A light emission device, comprising:

a light source; and

a lightguide component having a first principal face and a second principal face that is at an opposite side from the first principal face, the lightguide component including:

a lightguide layer including a light-receiving portion that receives light emitted from the light source, the lightguide layer further including a third principal face and a fourth principal face, wherein the third principal face is positioned closer to the first principal face side than a position of the fourth principal face to the first principal face side;

a light distribution controlling structure having a plurality of internal spaces, the plurality of internal spaces creating interfaces to direct a portion of the light propagating in the lightguide layer toward the first principal face via total internal reflection, wherein,

the plurality of internal spaces are formed in a redirection layer that is provided at the third principal face side or the fourth principal face side of the lightguide layer,

the lightguide component for light emission devices further comprising

a light coupling layer provided between the lightguide layer and the redirection layer, the light coupling layer including a plurality of low-refractive index regions that have a refractive index smaller than a refractive index of the lightguide layer, wherein,

in a plan view from a normal direction of the first principal face, a first region in which the light coupling layer is present and a second region in which the light coupling layer is not present are disposed so as to define a predetermined design;

a plurality of porous regions provided between the lightguide layer and the redirection layer, the plurality of porous regions having an internal void structure, wherein,

the plurality of porous regions include: a plurality of first porous regions which are located in the first region and in which the void structure is not buried; and a plurality of second porous regions which are located in the second region and in which the void structure is substantially buried;

a base layer provided vertically below the redirection layer;

an adhesive layer provided in contact with the plurality of porous regions so as to be positioned vertically above the base layer, wherein the adhesive layer is positioned vertically below the lightguide layer,

wherein, the void structure of the plurality of first porous regions is not buried by the adhesive layer, and the void structure of the plurality of second porous regions is substantially buried by the adhesive layer;

the plurality of low-refractive index regions are defined by the plurality of first porous regions;

wherein the light source is positioned vertically higher than the adhesive layer; and

with respect to a plan view of the lightguide component, the adhesive layer overlaps substantially the entire lightguide layer.

5 . The light emission device of claim 1 , wherein the lightguide layer increases in thickness away from the light-receiving portion.