Electroacoustic transducer

Abstract

An electroacoustic transducer, which has a lead frame previously formed into a predetermined shape, an outer case formed integrally with the lead frame and a drive section including a coil arranged inside the outer case, comprises an opening formed in the outer case; lands formed by exposing a part of the lead frame through an outer surface of the outer case; and the coil having coil terminals led out of the outer case through the opening and connected to the lands.

What is claimed is: 
     
       1. An electroacoustic transducer comprising: a lead frame formed into a predetermined shape;   an outer case integrated with said lead frame and having an opening;   a drive section including a coil arranged inside said outer case; and   lands formed by exposing a part of said lead frame through an outer surface of said outer case,   wherein said coil has coil terminals leading out of said outer case through said opening in said outer case and connected to said lands.   
     
     
       2. The electroacoustic transducer as claimed in claim 1, wherein said opening is formed in a bottom of said outer case and said lands are exposed on said bottom of said outer case. 
     
     
       3. The electroacoustic transducer as claimed in claim 1, wherein said opening is formed in a side wall of said outer case and said lands are exposed on said side wall of said outer case. 
     
     
       4. The electroacoustic transducer as claimed in claim 2, wherein said outer case has a groove portion and said opening is formed in said groove portion and said lands are aligned with said groove. 
     
     
       5. The electroacoustic transducer as claimed in claim 3, wherein said outer case has a groove portion and said opening is formed in said groove portion and said lands are aligned with said groove. 
     
     
       6. The electroacoustic transducer as claimed in claim 3, further comprising a plurality of external connection terminals formed by exposing a part of said lead frame on a side wall of said outer case, wherein said opening and said lands are located on the same side wall as said external connection terminals. 
     
     
       7. The electroacoustic transducer as claimed in claim 3, further comprising a plurality of external connection terminals formed by exposing a part of said lead frame on a side wall of said outer case, wherein said opening and said lands are located on a different side wall than said external connection terminals. 
     
     
       8. The electroacoustic transducer as claimed in any one of claims 1 to 7, wherein said electroacoustic transducer has an electromagnetic drive device. 
     
     
       9. The electroacoustic transducer as claimed in any one of claims 1 to 7, wherein said electroacoustic transducer has a piezo type drive device. 
     
     
       10. The electroacoustic transducer as claimed in claim 4, wherein said lead frame has a first bridge including a first bulge portion and a second bridge including a second bulge portion, wherein said first and second bulge portions are exposed through the outer surface of the outer case as said lands. 
     
     
       11. The electroacoustic transducer as claimed in claim 10, wherein said first bridge and first bulge portion are spaced from said second bridge and second bridge portion. 
     
     
       12. The electroacoustic transducer as claimed in claim 6, wherein said lead frame has a first bridge including a first bulge portion and a second bridge including a second bulge portion, wherein said first and second bulge portions are exposed through the outer surface of the outer case as said lands, and wherein areas to a left side and to a right side of said first and second bulge portions form said plurality of external connection terminals. 
     
     
       13. The electroacoustic transducer as claimed in claim 7, wherein said lead frame has a first bridge including a first bulge portion and a second bridge including a second bulge portion, wherein said first and second bulge portions are exposed through the outer surface of the outer case as said lands, and wherein areas to a left side and to a right side of said first and second bulge portions form said plurality of external connection terminals. .Iadd. 
     
     
       14.  An electroacoustic transducer having: an outer case having an opening formed therein;   a drive section including a coil arranged inside said outer case; and   lead terminals electrically connected to said drive section,   wherein lands are formed by exposing a part of said lead terminals on an outer surface of said outer case; and   said coil has coil terminals leading out of said outer case through said opening and connected to said lands..Iaddend..Iadd.   
     
     
       15.  An electroacoustic transducer having: an outer case having an opening formed therein;   a drive section including a coil arranged inside said outer case; and   a pair of conductive members arranged on said outer case, each of said conductive members having at least one external connection terminal,   wherein lands are formed by exposing a part of said pair of conductive members of an outer surface of said outer case; and   said coil has coil terminals leading out of said outer case through said opening and connected to said lands..Iaddend.