Surface light source device, illumination unit and light flux control member

A beam control, surface light source technology, applied in optical elements, optics, nonlinear optics, etc., can solve the problem of difficult to form planes in a continuous connection, and achieve the effect of ensuring uniformity
CN1721944AActive Publication Date: 2006-01-18ENPLAS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ENPLAS CORP
Publication Date
2006-01-18

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Abstract

Light flux control member 4 receives light from at least one LED 5, letting the light be emitted from emission face 4b. Light flux control member 4 is provided with recess 7 corresponding to each LED 5. Each recess 7 is configured so as to satisfy the following Conditions 1 and 2 for at least light which is emitted toward within a half-intensity-angular-range from corresponding LED 5. Condition 1: Relation 5 / 1>1 is satisfied except for light emitted toward within an angular-neighbourhood of a normal direction with respect to emission face 4b; Condition 2: Value of 5 / 1 decreases gradually according to increasing of 1; If a plurality of LEDs are employed, differences in emitting color among individual LEDs are made less conspicuous and uniform illumination free from uneven brightness is realizable.
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Description

technical field

[0001] The present invention relates to a surface light source device, a lighting unit and a light beam control member, which are applicable to, for example, a surface light source device used for backlighting a liquid crystal display panel, a lighting unit using the surface light source device as an illumination mechanism, and a surface light source device used on these surfaces. On the light beam control member used on the light source device or lighting unit. More specifically, the surface light source device, lighting unit, and light flux control member of the present invention can be employed for backlighting of a television monitor or a monitor of a computer. In addition, it can also be widely used for indoor indicator lights, various lighting, and the like. Background technique

[0002] Conventionally, a surface light source device using a plurality of light emitting diodes (LEDs) as point light sources has been known as an illumination mechanism for ...

Claims

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