Enplas Corporation

Yuki Fujii

Takuro Momoi

Tomohiro Saito

Hiroshi Takatori

Kazuma Yanagisawa

Yu Kamijo

Mamoru Yoshida

Takao Miyoshi

A light emitting device of the present invention includes: a substrate; a light emitting element; a light flux controlling member including a recess, a first reflecting surface, and an emission surface, the recess being configured to transmit light emitted from the light emitting element, the first reflecting surface being configured to reflect a part of light transmitted through the recess in a direction that is substantially perpendicular to a central axis of the light emitting element and is away from the central axis, the emission surface being configured to emit to outside another part of the light emitted from the light emitting element and light reflected at the first reflecting surface; and a light transmissive resin provided in the recess to seal the light emitting element and bond the light flux controlling member to the substrate and the light emitting element.

Light emitting device, light flux controlling member and surface light source device

A backlight comprises a plurality of light sources mounted on a mounting substrate in rows; lenses respectively arranged on the light sources; and a reflective sheet disposed on the mounting substrate and provided with through-holes through which the light sources protrude, wherein a first light source spacing of the plurality of light sources in a row direction is set to Px, an inter-row spacing of the plurality of light sources in other direction orthogonal to the row direction is set to Py, a first maximum length of each of the through-holes in the reflective sheet in the row direction is set to a, an inter-row maximum length of each of the through-holes in the reflective sheet in the other direction is set to b, the reflectivity of the reflective sheet is set to a and the reflectivity of the mounting substrate is set to &#x3b2;, the following mathematical formula 1 is satisfied if

Backlight

A light flux controlling member includes a plurality of incidence units disposed in a grid pattern and a plurality of emission units individually disposed between the plurality of incidence units. Each incidence unit includes an incidence surface disposed on a back side of the light flux controlling member, a first reflection surface disposed on a front side of the light flux controlling member at a position facing the light emitting element with the incidence surface placed between the first reflection surface and the light emitting element, and a second reflection surface disposed on the front side of the light flux controlling member at a position facing the side surface of the light flux controlling member with the first reflection surface placed between the second reflection surface and the side surface.

Light flux controlling member, light emitting device, surface light source device, and display device

A light flux controlling member includes n incidence units for allowing incidence of light emitted from n light emitting elements, respectively; an emission unit disposed between the n incidence units and allowing emission of the light incident on the n incidence units while guiding the light; and a plurality of legs. Each incidence unit includes an incidence surface and a reflection surface reflecting, in a direction along the substrate, the light incident on the incidence surface. The emission unit includes a first emission surface emitting a part of the light from the incidence unit, and a second emission surface disposed so as to face away from the first emission surface and emitting another part of the light from the incidence unit. Each leg is disposed at a position satisfying a predetermined condition.

Light flux controlling member, light emitting device, surface light source device, display device, and method for improving luminance unevenness of light emitting device

A light flux controlling member includes a plurality of incident units and an emission unit. The incident unit includes an incidence surface and a reflection surface. At least a part of a side surface of the light flux controlling member is configured such that &#x3b8;is smaller than &#x3b8;where L is a line connecting a gravity center Gof the light flux controlling member and a center Gof the reflection surface, Lis a line connecting a center Pof a light-emitting surface of the light-emitting element and a point Pon the side surface where light emitted from the center PLis a line along light emitted from the point Pto outside, &#x3b8;is an angle between L and Land &#x3b8;is an angle between Land a line L' that is parallel to L.

Light flux controlling member, light-emitting device, surface light source device and display device

Provided is light flux controlling member for controlling a distribution of light emitted from a plurality of light emitting elements disposed on a substrate, which includes a plurality of incidence units for allowing incidence of the light emitted from the plurality of light emitting elements, respectively; and an emission unit which emits the light incident on the plurality of incidence units while guiding the light, and which is disposed between the plurality of incidence units in a direction along the substrate. The light flux controlling member has a rectangular shape with rounded corners in plan view, and includes four corner portions and four side portions, and the inclination angle of the corner portions is different from the inclination angle of the side portions.

Condition 1 (an absolute value of a difference between IB&#xd7;B and EB&#xd7;B is 55% or smaller) and condition 2 (an absolute value of a difference between IY&#xd7;Y and EY&#xd7;Y is 55% or smaller) are satisfied, where, when an area of the light-emitting surface is equally divided into inner and outer regions by a boundary line as an outer edge of a region similar in shape to the light-emitting surface in plan view of a white LED package, IB (%) is an area ratio of blue LED chips in the inner region; IY (%) is an area ratio of the region where no blue LED chips is disposed in the inner region; EB (%) is an area ratio of the blue LED chips in the outer region; and EY (%) is an area ratio of the region where no blue LED chip is disposed in the outer region.

White LED package, light-emitting device, surface light source device and display device

This reflective member comprises a rectangular bottom surface, four inclined planes joined to the four edges of the bottom surface and whereof each is inclined with respect to the bottom surface so as to slope up from the bottom surface, and four planar corner portion inclined planes, whereof each is disposed in such a manner as to link two adjacent inclined planes.

Reflective member and surface light source device having said reflective member

A light flux controlling member that controls the light distribution of light emitted from a light emitting element is provided. This light flux controlling member has: an incidence surface constituted by an inner surface of a first concavity formed on a rear side of the light flux controlling member; an emission surface from which light incident on the incidence surface is emitted to the outside; and a second concavity formed on the rear side. The second concavity has a first inclined surface and a second inclined surface both inclined with respect to an imaginary straight line perpendicular to a central axis. The second inclined surface is formed in a region closer to the central axis than the first inclined surface. The first inclined surface is inclined at an angle reflecting at least part of incident light at the incidence surface and then Fresnel reflected at the emission surface.

Light flux controlling member, light emitting device, surface light source device and display device

A light emitting device includes a light emitting element emitting light from a top surface and a side surface, and a light flux controlling member controlling distribution of light emitted therefrom. The light flux controlling member includes a rear surface, an incidence surface, and an emission surface. When opening diameter of recess is &#x3c6;, maximum length of the light emitting element in plan view is L, and thickness of the light emitting element is t, diameter &#x3c6; is equal to or more than twice a distance from a point where illuminance of light emitted from the side surface thereof to reach the substrate is maximum in illuminance distribution on the substrate to central axis of the light flux controlling member, and is less than 'L+12t.'

Light emitting device, surface light source device and display apparatus

A light flux controlling member includes an incidence surface, an emission surface, and an annular groove part. The annular groove part includes a first internal surface and a second internal surface. The second internal surface protrudes from a virtual line connecting an outer and inner end portions toward an opening side of the annular groove part; and, when an angle on the annular groove part side of two angles between a tangent to an arbitrary point of the second internal surface and the central axis is an inclination angle at the arbitrary point of the second internal surface in the cross section including the central axis, an inclination angle at the inner end portion is smaller than an inclination angle at the outer end portion, and an inclination angle of the second internal surface increases as a distance from the central axis increases.

Light flux controlling member having a recessed incidence surface and annular groove, light-emitting device, surface light source device and display device

In the light flux controlling member (), the angle between an optical path of light output from the light emission center () of a light emitting element () and optical axis Lis &#x3b8;2. Light is incident on the light flux controlling member () through an input surface and travels inside the light flux controlling member at an angle &#x3b8;2 with respect to optical axis L. Then, light is output from a light control output surface () at an angle &#x3b8;3 with respect to optical axis L. The input surface () and the light control output surface () are formed such that, in a range 0&#x3c;&#x3b8;1&#x2266;&#x3b8;1max, the relationship between &#x3b8;1 and &#x3b8;2 is reversed from &#x3b8;1&#x3c;&#x3b8;2 to &#x3b8;1&#x3e;&#x3b8;2 when &#x3b8;1 increases, and the relationship between &#x3b8;1 and &#x3b8;3 is reversed from &#x3b8;1&#x3c;&#x3b8;3 to &#x3b8;1&#x3e;&#x3b8;3 when &#x3b8;1 increases.

Growing community of inventors

Saitama, Japan

Yuki Fujii