Methods and compositions for targeted modification of chromatin structure, within a region of interest in cellular chromatin, are provided. The eject mechanism defines a slider movably mounted on the housing and engageable with the card, a spring for biasing the slider to move in a direction opposite to an insertion direction of the card, a cam mechanism including an cam and a cam groove formed around the cam having a starting point, and a pin member movable within the cam groove. One of the hole transport layers is a layer adjacent to the luminescent layer, and when the ionization potentials of the luminescent layer, the hole transport layer adjacent to the luminescent layer, and another of the hole transport layers, respectively, designated to Ip1, Ip2 and Ip3, the relationship Ip1>Ip2>Ip3 is satisfied. The imaging apparatus further includes a heat conduction member configured to contact the rear surface of the photoelectric conversion element package, exposed by the opening, and the chassis member. The cap structure contains a phosphor material and a diffuser material.