A circuit board device includes one or more slots formed in a board, and one or more fastener members having one or more projections engageable into the slots of the board, to anchor the fastener member to the board, and to prevent the fastener member from moving relative to the board while welding the fastener member to the board with one or more solders. The writer has an optic input for receiving an optic output. Other aspects and implementations are contemplated. Accordingly, since the potential in the lower layer region of the vertical transfer register and the channel stop region at both sides of the lower layer region is low, electric charges photoelectrically-converted by the sensor region are blocked by this potential barrier and cannot be diffused easily. The cam follower assemblies include cam rollers operably engaged upon peripheries of the cams, and the cam follower assemblies move in response to rotation of the cams. A concealment film is removably adhered to the key card unit and conceals the through holes so that the through holes cannot be seen.