Piston and cylinder unit including a piston position detection unit and a collimator

A piston position detection unit for detecting the position of a piston, wherein the piston is axially movable along a longitudinal piston axis in a cylinder of a piston and cylinder unit, comprising:

• a housing being designed to be cylindrical and having a longitudinal housing axis, the housing being separate from the cylinder;
• an electronic unit being arranged in the housing and including an antenna for sending and receiving high frequency signals through the housing along a beam path, the main sense of direction of radiation of the antenna extending perpendicularly to the longitudinal housing axis and parallel to the longitudinal piston axis;
• and
• a collimator being at least partly arranged in the housing or partly forming the housing and being arranged in the beam path of the antenna.

A piston and cylinder unit, comprising:

• a cylinder including an interior extending axially in the cylinder, a mounting bore extending radially in the cylinder, a cylinder tube and a cylinder head including a cylinder head bottom surface;
• a piston being supported in the interior of the cylinder to be axially movable along a longitudinal center axis;
• a piston position detection unit being arranged in the mounting bore and being designed and arranged to detect the axial position of the piston in the cylinder by high frequency technology, the piston position detection unit including an antenna for sending and receiving high frequency signals along a beam path, the antenna having a main sense of direction of radiation extending parallel to the longitudinal center axis;
• a collimator being arranged in the beam path of the antenna;
• and
• a plurality of beam deflecting elements being arranged in the cylinder head bottom surface, the beam deflecting elements being designed as impressions located in the cylinder head bottom surface, the impressions being spaced apart and conical.