Surface light source apparatus
A surface light source and light diffusion technology, which is applied in the field of surface light source devices, can solve the problem that the outgoing light cannot form white light, and achieve the effect of less power consumption
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Embodiment 1
[0030] use as figure 1 The shown surface light source device (3) has a light diffusion plate (1), LEDs (2) arranged on the back side thereof, and a reflector (4) arranged on the back side thereof.
[0031] As the light-diffusing plate (1), a plate prepared by adding a light-diffusing agent to 100 parts by mass of polystyrene resin ("Toyo Scullen HRM40" manufactured by Toyo Scullen Co., Ltd., with a refractive index of 1.59) was used. (Acrylic cross-linked resin particles, "MBX-2H manufactured by Sekisui Chemical Co., Ltd., weight-average particle diameter: 3 μm, refractive index: 1.49") 10 parts by mass were mixed and then extruder (screw diameter: 40 mm) It is melt-kneaded at a temperature of 210°C to 250°C, and extruded into a plate shape by a T-die head at a temperature of 245°C to 255°C through a feeder group. The total light reflectance (Rt) measured from the back side of the light-diffusing plate (1) was 43.7%, and the diffuse light reflectance (Rd) measured from the b...
Embodiment 2
[0042] The light-diffusing plate (1) was produced in the same manner as in Example 1 except that the used amount of the light-diffusing agent was 4.1 parts by mass. The total light reflectance (Rt) measured from the back side of this light-diffusing plate (1) was 38.4%, and the diffuse light reflectance (Rd) measured from the back side was 38.4%. 1 ) was 30.1%, the total light transmittance (Tt) was 55%, and the thickness was 2.0 mm. A surface light source device (3) was produced in the same manner as in Example 1 except that the above-mentioned light-diffusing plate (1) was used. When each LED (2) was turned on, and the light emitted from the front side of the light-diffusing plate (1) was visually observed, it was completely white light without redness. In addition, the color uniformity (Δu'v') of the emitted light was 0.010677.
Embodiment 3～ Embodiment 5
[0044] Light-diffusing plates (1) used plates prepared in such a manner that the amount of the light-diffusing agent used was 4.5 parts by mass (Example 3), 2.4 parts by mass (Example 4), and 3 parts by mass, respectively. (Embodiment 5), others are made in the same manner as in Embodiment 1. The light-diffusing plate (1) of Example 3 has a total light reflectance (Rt) measured from the back side of 35.4%, and a diffuse light reflectance (Rd) measured from the back side is 35.4%. 1 ) was 27.1%, the total light transmittance (Tt) was 60%, and the thickness was 1.5mm. The total light reflectance (Rt) measured from the back side of the light-diffusing plate (1) used in Example 4 was 30.3%, and the diffuse light reflectance (Rd) measured from the back side was 30.3%. 1 ) was 22.7%, the total light transmittance (Tt) was 60%, and the thickness was 2.0mm. The total light reflectance (Rt) measured from the back side of the light-diffusing plate (1) used in Example 5 was 32.0%, and ...
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