Patent ID: 7411601

Claim:
An exposure head used for forming a latent image on a photoreceptor in a printer, comprising: an array substrate having a plurality of organic EL elements arranged in an array on one face, and configured such that an outgoing beam from said organic EL elements is emitted to the other face; and a plurality of circuit chips having a circuit for driving said organic EL element, and in which the forming face of said circuit is serially arranged on said array substrate along the extending direction of said array substrate so as to face one face of said array substrate, said plurality of circuit chips arranged to be superposed on said plurality of organic EL elements; and; plurality of wiring groups provided for each mutual boundary location of said plurality of circuit chips on one face of said array substrate and outside the arrangement area of said organic EL element, each wiring group bump-bonded to two circuit chips that are adjacent to the relevant wiring group with the boundary location interposed, wherein said plurality of circuit chips are mutually daisy-chain connected.