Electroacoustic transducer and electronic device using the same
View Patent ↗An electroacoustic transducer has a magnetic circuit, a frame combined with the magnetic circuit, a diaphragm combined with a periphery of the frame, a voice coil, a terminal, and a holder covering the frame. The voice coil is combined with the diaphragm and a part of the voice coil is arranged in a magnetic gap of the magnetic circuit. The terminal, made of a metal plate having spring property and electric conductivity, electrically connects an outside circuit and the voice coil utilizing spring pressure generated when the metal plate is bent. The holder forms a stopper for restricting a bend of the metal plate forming the terminal to within a reversible limit of a metallic material.
1. An electroacoustic transducer, comprising:
a magnetic circuit;
a frame combined with the magnetic circuit;
a diaphragm combined with a periphery of the frame;
a voice coil combined with the diaphragm and partially arranged in a magnetic gap of the magnetic circuit;
at least two terminals, each terminal made of a metal plate having a spring property and an electrical conductivity, and electrically connecting an outside circuit and the voice coil utilizing a spring pressure generated when the metal plate is bent; and
a holder made of an elastic body, the holder extending from a front surface to a back surface via opposing side surfaces of the frame to cover the frame, wherein the holder extends between the at least two terminals on the frame and the holder forms a stopper for restricting a bend of the metal plate forming the terminal to within a reversible limit of the metal.
2. The electroacoustic transducer of claim 1 , wherein the stopper is provided at a back surface of the magnetic circuit.
3. The electroacoustic transducer of claim 1 , wherein the holder is made of a polymeric material.
4. The electroacoustic transducer of claim 3 , wherein the holder is made of silicon rubber.
5. The electroacoustic transducer of claim 4 , wherein the holder is made of silicon rubber of a rubber hardness of 20 degrees or higher.
6. An electronic device, comprising:
an electroacoustic transducer including:
a magnetic circuit;
a frame combined with the magnetic circuit;
a diaphragm combined with a periphery of the frame;
a voice coil combined with the diaphragm and partially arranged in a magnetic gap of the magnetic circuit;
at least two terminals, each terminal made of a metal plate having a spring property and an electrical conductivity, and electrically connecting an outside circuit and the voice coil utilizing a spring pressure generated when the metal plate is bent; and
a holder made of an elastic body, the holder extending from a front surface to a back surface via opposing side surfaces of the frame to cover the frame, wherein the holder extends between the at least two terminals on the frame and the holder forms a stopper for restricting a bend of the metal plate forming the terminal to within a reversible limit of the metal; and
an electronic circuit electrically connected with the electroacoustic transducer through the terminal, and feeding the electroacoustic transducer.
7. The electronic device of claim 6 , wherein the stopper is provided at a back surface of the magnetic circuit.
8. The electronic device of claim 6 , wherein the holder is made of a polymeric material.
9. The electronic device of claim 8 , wherein the holder is made of silicon rubber.
10. The electronic device of claim 9 , wherein the holder is made of silicon rubber of a rubber hardness of 20 degrees or higher.
11. The electroacoustic transducer of claim 2 , wherein the holder is made of a polymeric material.
12. The electroacoustic transducer of claim 11 , wherein the holder is made of silicon rubber.
13. The electroacoustic transducer of claim 12 , wherein the holder is made of silicon rubber of a rubber hardness of 20 degrees or higher.
14. The electronic device of claim 7 , wherein the holder is made of a polymeric material.
15. The electronic device of claim 14 , wherein the holder is made of silicon rubber.
16. The electronic device of claim 15 , wherein the holder is made of silicon rubber of a rubber hardness of 20 degrees or higher.
17. The electroacoustic transducer of claim 1 , wherein the holder covers a whole back surface of the magnetic circuit.
18. The electroacoustic transducer of claim 1 , wherein the holder includes a first holder portion and a second holder portion each disposed on the back surface of the frame, a fixed end of each terminal adjacent the first holder portion and a movable end of each terminal adjacent the second holder portion.
19. The electronic device of claim 6 , wherein the holder covers a whole back surface of the magnetic circuit.
20. The electronic device of claim 6 , wherein the holder includes a first holder portion and a second holder portion each disposed on the back surface of the frame, a fixed end of each terminal adjacent the first holder portion and a movable end of each terminal adjacent the second holder portion.
21. The electroacoustic transducer of claim 1 ,
wherein each of the terminals include a fixed end disposed on the back surface of the frame in a region of the back surface excluding the holder.
22. The electronic device of claim 6 ,
wherein each of the terminals include a fixed end disposed on the back surface of the frame in a region of the back surface excluding the holder.