JPS58138903U

JPS58138903U - surface light source device

Info

Publication number: JPS58138903U
Application number: JP1982035405U
Authority: JP
Inventors: 井手野　宏昭
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1982-03-12
Filing date: 1982-03-12
Publication date: 1983-09-19

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の面光源装置の単面図、第２図′は第１図
の側面図、第３図および第４図はそれぞれ従来の面光源
装置の他の例を示す平面図、第５図は第４図の側面図、
第６図はこの考案の面光源装置の一実施例の平面図、第
７図は第６図の側面図である。１・・・透光性板体、２・・・挿入孔、３・・・白熱電
球、４・・・フィラメント、５・・・端面、５ａ・・・
曲線部、６・・・光拡散処理面、なお、図中同一符号は
同一または相当部分を示す。補正　昭５７．　９．２０実用新案登録請求の範囲を次のように補正する。Ｏ実用新案登録請求の範囲（１）透光性板体に挿入孔を設け、この挿入孔に光源を
埋設し、この光源から発生して上記透光性板体内を伝搬
する光を拡散させて透光性板体外へ導出する光拡散処理
面をこの透光性板体に形成し、この光拡散処理面の面域
とその近傍を照明面とする面光源装置において、上記光
源と透光性板体の縁端面とを結ぶ線分が上記光拡散処理
面の面域を横切らないような縁端面部位ではこの縁端面
部位における法線と上記線分とのなす角が透光性板体の
材料の光全反射臨界角以上であるような形状の縁端面を
透過性板体に形成、　　することを特徴とする面光源装
置。（２）透光性板体の光全反射臨界角と等しいかもしくは
それより大きく直角より小さい一定の角度をθｉとし、
光源の位置を原点として原点からの距離をγ、基準線に
対する位相角をθとする極座標で表わしたとき透光性板
体の法線方向の投影図形の少なくとも一部が、γｃｘｏ
ｘｐ（θ・ｔａｎθｉ）で表わされる対数螺線の一部で
あるかもしくは上記対数螺線に近い滑らかな曲線である
ことを特徴とする実用新案登録請求の範囲第１項記載の
面光源装置。Fig. 1 is a single side view of a conventional surface light source device, Fig. 2' is a side view of Fig. 1, and Figs. 3 and 4 are plan views showing other examples of the conventional surface light source device. Figure 5 is a side view of Figure 4;
FIG. 6 is a plan view of an embodiment of the surface light source device of this invention, and FIG. 7 is a side view of FIG. 6. DESCRIPTION OF SYMBOLS 1... Translucent plate body, 2... Insertion hole, 3... Incandescent light bulb, 4... Filament, 5... End surface, 5a...
Curved portion, 6... Light diffusion treated surface, and the same reference numerals in the drawings indicate the same or corresponding parts. Correction 1984. 9.20 The scope of claims for utility model registration shall be amended as follows. O Utility Model Registration Claims (1) An insertion hole is provided in a translucent plate, a light source is buried in the insertion hole, and light generated from the light source and propagated within the translucent plate is diffused. In a surface light source device in which a light-diffusion treated surface that is guided out of the light-transmitting plate is formed on this light-transmitting plate, and the area of the light-diffusion treated surface and its vicinity is used as an illumination surface, the above-mentioned light source and the light-transmitting In an edge surface area where the line segment connecting the edge surface of the plate does not cross the surface area of the light diffusion treated surface, the angle between the normal line at this edge surface area and the line segment is 1. A surface light source device, characterized in that a transparent plate is formed with an edge surface having a shape that is greater than or equal to the critical angle of total light reflection of a material. (2) Let θi be a constant angle that is equal to or larger than the critical angle of total light reflection of the transparent plate and smaller than the right angle,
When expressed in polar coordinates with the position of the light source as the origin, the distance from the origin as γ, and the phase angle with respect to the reference line as θ, at least a part of the projected figure in the normal direction of the translucent plate is γcxo
The surface light source device according to claim 1, which is a part of a logarithmic spiral represented by xp(θ·tanθi) or a smooth curve close to the logarithmic spiral.

Claims

[Scope of utility model registration request]

(1) An insertion hole is provided in the translucent plate, a light source is buried in the insertion hole, and the light generated from the light source propagates inside the translucent plate and is diffused to the outside of the translucent plate. In a surface light source device in which a light diffusion-treated surface to be derived is formed on this light-transmitting plate, and the area of the light-diffusion-treated surface and its vicinity serve as an illumination surface, the light source and the edge surface of the light-transmitting plate In an edge surface area where the line segment connecting the above does not cross the area of the light diffusion treated surface, the angle between the normal line at this edge area and the above line segment is the critical total light reflection of the material of the transparent plate. 1. A surface light source device, characterized in that an edge surface having a shape that is larger than a corner is formed on a transparent plate.

(2) A certain angle that is equal to or greater than the critical angle of total reflection of the transparent plate and smaller than the right angle, where θi is the origin, the distance from the origin is γ, and the phase angle with respect to the reference line. When expressed in polar coordinates with θ being θ, at least a part of the projected figure in the normal direction of the translucent plate is γ−
2. The surface light source device according to claim 1, which is a part of a logarithmic spiral represented by oxp(θ an θi) or a smooth curve close to the logarithmic spiral. −