The present invention provides a method for producing a thermoplastic film which makes it possible to improve the optical properties of the thermoplastic film obtained by stretching and a thermoplastic film manufactured thereby. The encryption system is operable at encryption rates in excess of 10 Mbps and is expandable to over 200 Mpbs. In at least one embodiment, to improve the cooling of detector elements which are accommodated in the detector housing, one or more ventilation openings, provided with at least one closure device to interact with centrifugal force regulators, are provided for an air flow to pass through. The support frame defines a through hole and a finger portion extending into the through hole. Between the two substrates, a member composed of two or more wire rods and formed in the shape of a mesh is disposed, functioning as an electrode.