U.S. Philips Corporation

Peter Bleim

Ewald Frasl

Erich Klein

Ernst Ruberl

In an apparatus ( ) having an electroacoustic transducer ( ) and having a printed circuit board ( ) the electroacoustic transducer ( ) has two terminal contact elements ( ) and the printed circuit board ( ) has two mating contact elements ( ), which terminal contact elements ( ) have two terminal contact portions ( ) which are oriented parallel to the transducer axis ( ) of the transducer ( ) and which mating contact elements ( ) have two mating contact portions ( ) which are oriented parallel to the transducer axis ( ), the terminal contact portions ( ) and the mating contact portions ( ) being held pairwise against each other in a direction transverse to the transducer axis ( ) and thus forming at least parts of a retainer ( ) with the aid of which the transducer ( ) is secured to the printed circuit board ( ).

Apparatus including an electroacoustic transducer having terminal contacts which extend in the direction of the transducer axis and including a printed circuit board having mating contacts

In an electroacoustic transducer (1) having a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) in the area of the rear volume (HV) and cooperating with a magnet system (9), and including a substantially annular closing member (30) for closing the rear volume (HV), the closing member (30) has an annular body (38) and a ring projection (39), which projects obliquely from the annular body (38) along its entire circumference and is movable against spring action, at least one passage (34, 35, 36, 37) of the closing member (30), this passage having been provided in order to realize an acoustic friction between the rear volume (HV) and the acoustic free space surrounding the transducer (1), terminating in the annular contact surface (32) of the annular body (38), this annular contact surface extending transversely to the transducer axis (2).

Electroacoustic transducer comprising a closing member for closing the

In an electroacoustic transducer (1) having a diaphragm (5), a partition wall (24) situated behind the diaphragm (5) and traversed by partition openings (25, 26, 7, 28 and 29, 30, 31, 32), and a mask (37) arranged adjacent the partition wall and provided with mask openings (38, 39, 40, 41) which can be made to coincide with different openings (25, 26, 27, 28 and 29, 30, 31, 32, respectively) in different positions of the partition wall (24) and the mask (37) relative to one another, the mask is simply formed by a flange (37) of a magnet-system pan (19) of the magnet system (16) of the transducer (1).

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Vienna, Austria

Peter Bleim