Compact electroacoustical transducing with flat conducting tinsel leads crimped to voice coil ends

• Main Authors: EDWARDS; ROBERT, LARSON; JOHN, WESTLEY; BRANDON B
• Format: Patent
• Language: English
• Published: 13.08.1991
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

A loudspeaker driver has a plastic basket having front and rear portions. The front portion is formed with six radial ribs extending between a central motor cup support and an annular rim. A cup-shaped front pole piece is molded into the pole support and formed with an axial groove for accommodating an axial lead extending from the front end of a voice coil that moves axially in a gap between the circumferential wall of the front pole plate and a circular rear pole plate and circular disk neodymium disk magnet sandwiched between the rear pole plate and the closed end of the front pole plate. Flat tinsel leads are crimped to ends of the voice coil and brought out through slits in the cone to terminals in opposite sides of the rear portion of the basket. The circumferential edge of the cone is clamped between the front and rear portions of the basket and ultrasonically bonded to an annular surface on the rear of the front portion. The rear end of the cone is cemented to the rear of the voice coil support just forward of where the spider collar is fastened to the voice coil support. The circumferential edge of the spider is ultrasonically bonded to a depressed annular rim at the rear of the rear portion of the basket.