A cover system for opening and closing a side of a housing which is provided for the reception of an imaging device and an optical unit for a head-up display, wherein - the cover system has at least one first cover part and one second cover part, - the first cover part and the second cover part adjoin one another in a first state and together form a closed surface having four corner sections (E1, E2, E3, E4) - a first edge of the first cover part forms an outer edge of the closed surface, wherein the ends of the first edge of the first cover part immediately adjoin first two adjacent corner sections (E1, E2) of the closed surface, - a first edge of the second cover part forms at least a part of a further outer edge of the closed surface, wherein the ends of the first edge of the second cover part either immediately adjoin second two adjacent corner sections (E3, E4), different from the first two adjacent corner sections (E1, E2) of the closed surface, or are located in the edge of the closed surface, which extends between the second two adjacent corner sections (E3, E4) of the closed surface and for the formation of a second state - the first edge of the first cover part is movable in a definable direction about a first definable angle about an axis D1 which extends parallel to an imaginary straight line through the ends of the first edge of the first cover part, - the first edge of the second cover part is movable in the definable direction about a second definable angle about an axis D2 which extends parallel to an imaginary straight line through the ends of the first edge of the second cover part, and - the first edge of the second cover part is movable in a definable direction (R') by a definable distance relative to the surface which is defined by an imaginary rectilinear connection of the four corner sections (E1, E2, E3, E4) of the closed surface, characterised in that - the first cover part has at least one second edge, which is aligned with the edge of the closed surface, which extends between the second two adjacent corner sections (E3, E4) of the closed surface and - the first cover part in the region of its at least one second edge and the second cover part are attached together in the region of its first edge such as to be rotatable relative to one another about the axis D2. - the cover system has at least one first cover part and one second cover part, - the first cover part and the second cover part adjoin one another in a first state and together form a closed surface having four corner sections (E1, E2, E3, E4) - a first edge of the first cover part forms an outer edge of the closed surface, wherein the ends of the first edge of the first cover part immediately adjoin first two adjacent corner sections (E1, E2) of the closed surface, - a first edge of the second cover part forms at least a part of a further outer edge of the closed surface, wherein the ends of the first edge of the second cover part either immediately adjoin second two adjacent corner sections (E3, E4), different from the first two adjacent corner sections (E1, E2) of the closed surface, or are located in the edge of the closed surface, which extends between the second two adjacent corner sections (E3, E4) of the closed surface and for the formation of a second state - the first edge of the first cover part is movable in a definable direction about a first definable angle about an axis D1 which extends parallel to an imaginary straight line through the ends of the first edge of the first cover part, - the first edge of the second cover part is movable in the definable direction about a second definable angle about an axis D2 which extends parallel to an imaginary straight line through the ends of the first edge of the second cover part, and - the first edge of the second cover part is movable in a definable direction (R') by a definable distance relative to the surface which is defined by an imaginary rectilinear connection of the four corner sections (E1, E2, E3, E4) of the closed surface, characterised in that - the first cover part has at least one second edge, which is aligned with the edge of the closed surface, which extends between the second two adjacent corner sections (E3, E4) of the closed surface and - the first cover part in the region of its at least one second edge and the second cover part are attached together in the region of its first edge such as to be rotatable relative to one another about the axis D2.