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Light diffusing/collecting member and surface light source device using the same
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A surface light source and component technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of reducing the meaning of prism shape and reducing diffusion function, and achieve the effect of realizing light weight, realizing light weight structure, and reducing the number of components
Inactive Publication Date: 2006-06-28
STANLEY ELECTRIC CO LTD
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Problems solved by technology
[0027] In addition, even if these optical films or diffusion sheets and / or prism sheets are pasted on the diffusion sheet, or the optical sheet of the double-layer structure composed of the diffusion layer and the prism layer is integrally formed using materials with approximately the same refractive index, Also inhibits the light-gathering function of the prism, however, as a result, the meaning given to the shape of the prism is reduced
[0028] In this regard, although reducing the concentration of the diffusing agent contained in the diffusion layer can improve the light-gathering function, it will lead to a decrease in the diffusion function.
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Embodiment 1
[0069] figure 1 and figure 2 The configuration of one embodiment of the surface light source device of the present invention is shown.
[0070] exist figure 1 and figure 2 Among them, the surface light source device 10 is composed of the following parts: at least one, four linear light sources 11 in the figure; a reflective surface 12 arranged below each linear light source 11; Diffusion light collecting member 13 .
[0071] The above-mentioned linear light source 11 is constituted by, for example, cold-cathode tubes or the like, and is arranged parallel to each other at equal intervals in a flat shape so as to irradiate light to the entire upper light-emitting surface A.
[0072] The above-mentioned reflective surface 12 is constituted, for example, as a diffuse reflective surface formed by white spray coating or a foamed resin sheet, etc., and is disposed below each linear light source 11, so that the light emitted downward or sideways from the corresponding linear l...
Embodiment 2
[0087] Figure 4 and Figure 5 The structure of another embodiment of the surface light source device of this invention is shown.
[0088] exist Figure 4 and Figure 5 Among them, the surface light source device 20 is composed of the following parts: at least one, four linear light sources 21 in the figure; a reflective surface 22 arranged below each linear light source 21; Diffusion light collecting member 23 .
[0089]The above-mentioned linear light source 21 is constituted by, for example, cold cathode tubes or the like, and is arranged parallel to each other at equal intervals in a flat shape so as to irradiate light to the entire upper light-emitting surface A.
[0090] The above-mentioned reflective surface 22 is constituted, for example, as a diffuse reflective surface formed by white spray coating or a foamed resin sheet, etc., and is disposed below each linear light source 21, so that the light emitted downward or sideways from the corresponding linear light sou...
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Abstract
An object of the present invention is to provide a light-diffusing member and a surface light source device that can easily achieve a lightweight structure with a simple structure. The surface light source device (10) includes: a flat light source (11); a substantially flat diffuser and light-condensing member (13) arranged above the light source, and the above-mentioned diffuser and light-condenser member (13) is successively composed of a diffuser with a diffusion function from the light source side; Diffusion layer (24), low refractive index layer (25) and light concentrating layer (26) with light concentrating function are integrally constituted, and above-mentioned low refraction index layer (25) utilizes refractive index ratio diffusion layer (24) and light concentrating layer (26) Low material composition, thereby constituting the surface light source device (10).
Description
technical field [0001] The present invention relates to a surface light source device used for backlighting transmissive display devices such as liquid crystal panels, for example. Background technique [0002] Conventionally, a transmissive display device such as a liquid crystal panel uses a surface light source device to illuminate from the back in order to obtain a brighter screen display. Especially for color liquid crystal panels used in personal computers and liquid crystal televisions, since the aperture ratio of the driving circuit is restricted, and the light transmittance is lowered by color filters, it is necessary to perform backlighting using a surface light source device. [0003] Generally, such surface light source devices for backlighting are classified into so-called side type and direct type according to the arrangement of light sources. In addition, in particular, surface light source devices for backlighting large display devices such as large televisi...
Claims
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