Exposure head, image formation apparatus, reading head, and reading apparatus

Abstract

An exposure head according to one or more embodiments may include: a light emitting element board on which light emitting elements are arranged; a holder that holds the light emitting element board and is provided with an opening; a transparent cover arranged at a position to shield the opening, such that a first attachment surface of the holder is attached to a second attachment surface of the transparent cover by using an adhesive; and an optical system arranged between the light emitting element board and the transparent cover. The exposure head satisfies an expression defined as θ1<θ2, where θ1 is a contact angle on the first attachment surface representing wettability of the first attachment surface, and θ2 is a contact angle on the second attachment surface representing wettability of the second attachment surface.

Dependencies are inferred from the claim text.