| 摘要 |
PROBLEM TO BE SOLVED: To suppress the illuminance distribution of light emitted from an EL element from becoming uneven, only at both end parts of the EL element, as compared with a light source device fixed to a second substrate by suppressing curving of the EL element resulting from contraction of a first substrate or the second substrate in the light source device, having the first substrate constituting the EL element, and the second substrate which is different from the first substrate in coefficient of linear expansion. SOLUTION: The light source device 1 is equipped with an organic EL element 6 obtained by sequentially forming a transparent electrode 11; an organic EL layer 12, and a second electrode 13 on a glass substrate 10 of which the aspect ratio of the length in the short direction to the length in the longitudinal direction is 1:3 or larger; and a printed-circuit board 2, of which the linear expansion coefficient is different from that of the glass substrate 10. Then, the organic EL element 6 is fixed against the printed-circuit board 2, in a state where electrode terminals 11a, 13a installed at both end parts thereof are connected electrically to a wiring pattern 3. The organic EL element 6 is fixed to the printed-circuit board 2 by a double-sided adhesive tape 16, of which the intermediate part is interposed between the organic EL element 6 and the printed-circuit board 2. COPYRIGHT: (C)2008,JPO&INPIT
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