Nippon Sheet Glass Company, Limited

Hideaki Saitou

Seiji Ohno

Yukihisa Kusuda

Yasunao Kuroda

Shunsuke Ohtsuka

Takahisa Arima

The cost of a light-emitting element matrix array is reduced by implementing a function equivalent to a light-emitting thyristor by elements different therefrom. A plurality of combinational element are arrayed in one line. The plurality of combinational elements are divided into groups n by n. The bases of transistors included in each group are separately connected to base-selecting lines and the anodes of light-emitting diodes included in each group are commonly connected to one anode terminal every group.

Light-emitting element matrix array

A method for setting the amount of light in an array of light-emitting thyristors, each thyristor having I-L characteristic in which a luminous efficiency is decreased in a lower current field, is provided. According to the method, the amount of light emitted from a light-emitting thyristor is set so that a predetermined exposure energy may be obtained without decreasing a luminous efficiency of a light-emitting thyristor. The density D of a current to be supplied to the light-emitting thyristor to obtain a predetermined exposure energy is selected so as to satisfy the range of 3&times;D <D<100 MA/m , wherein D is a threshold current density for light emission which is defined as a current density corresponding to the value of a current at a point where a tangent drawn at the value of a current corresponding to a current density of 50 MA/m with respect to the curve of the I-L characteristic intersects a current axis.

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Osaka, Japan

Hideaki Saitou