Shaving head with doming control

A rotary shaver, comprising:

• a cap comprising one or more annular shaving tracks, the one or more annular shaving tracks comprising a plurality of slots, each slot oriented at an angle (β) to a radial direction with respect to the axis of rotation, each track having a domed shaped upper surface and a curved shaped lower surface,
• a cutter unit, comprising a support member having an axis of rotation and carrying a plurality of cutting elements each cutting element comprising:
• a leg portion, and
• a distal portion adjacent the leg portion, wherein the distal portion comprises:
• an upper face that is convex having a partial circular cylindrical shape and partially flat in a circumferential direction in a plane perpendicular to a direction of movement, said upper face terminating in a cutting edge lying in a radial plane and wherein said upper face and said cutting edge have a first radius of curvature R,
• a forward face, having a slightly concave shape angled at a cutter angle (α) with respect to a direction of movement of the leg portion relative to the axis of rotation of the support member, wherein the cutter angle (α) is between 40° and 50°, said forward face having a second radius of curvature r,
• wherein said upper face intersects the forward face in said cutting edge forming a straight line when viewed in a vertical direction at least over a portion intended to contact the shaving track formed in the cap, thus allowing a constant shearing angle β over over the radial extent of the cutter by ensuring that R=r·cos(α),
• wherein the second radius of curvature r depends on the cutter angle (α) such that R=r cos(α) such that the cutting edge will be located at an intersection of the forward face and the upper face.