LENS SHEET AND SURFACE LIGHT SOURCE FORMED BY USING THIS LENS SHEET

Japanese Patent JP3518554

B2

PURPOSE: To prevent the hindrance of the uniform distribution of light source light over the entire part in a light transmission plate by the total light reflection on the surface of the light transmission plate even if a lens sheet is placed by forming a lens group on one surface and a specific projection group on the other surface.
CONSTITUTION: The projection group 41 having a height of <100μm and over the wavelength of the light source light on the non-lens surface side of the lens sheet 4 and a gap 9 is formed at least objectively between the smooth plane 10 of the light transmission plate and the lens sheet 4. The height of the projections (i.e. the spacing of the gap part) is specified to one wavelength of the light source light or above, by which the sure total reflection on the surface 10 is obtd. Further, the projections are formed on the rear surface of the lens sheet 4 and, therefore, the region having the gap part 9 and the region where there is no gap part and both are integrated (or below the wavelength of the light even if there is the gap) are formed between the light transmission plate 1 and the lens sheet 4. Then, the total reflection of the incident light takes place in the gap part and the incident light transmits the part where there are no gap. The brightness distribution uniform over the entire part is thus obtd.

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Nishio, Toshikazu
Takeuchi, Michiko
Masubuchi, Noboru

JP8695493A

April 12, 2004

March 23, 1993

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DAINIPPON PRINTING CO LTD

G02B5/02; G02B6/00; G02F1/1335; G02F1/13357; G09F9/00; (IPC1-7): G02B5/02; G02B6/00; G02F1/13357; G09F9/00

JPH0491905A
JPH05341132A
JPH0369184B2

韮澤 弘 （外７名）

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