Microphone having flexible pipe

• US 20120063629A1
• Filed: 08/09/2011
• Published: 03/15/2012
• Est. Priority Date: 09/10/2010
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Audio-technica
• Original Assignee: Kabushiki Kaisha Audio-technica
• Inventors: AKINO, Hiroshi
• Granted Patent: US 8,989,421 B2
• Time in Patent Office: Days
• US Class Current: 381/355
• CPC Class Codes: H04R 1/086 Protective screens, e.g. all weather or wind screens

Abstract

There is provided a microphone having a flexible pipe, which has a configuration capable of preventing both of the occurrence of noise caused by extraneous electromagnetic waves and the occurrence of noise caused by electric discharge when touched. In a unit holder 20 to which a microphone unit 10 is connected, there are provided a metal-made outer cylinder body 21 one end side of which is fixed to a support pipe 30 and the other end side of which is connected to a unit casing 11 of the microphone unit; and a metal-made inner cylinder body 22 which is arranged in the outer cylinder body 21, one end side of which is electrically connected to a shield cover conductor 43 of a microphone cable 40, the other end side of which is mounted with a circuit board 23 having a FET 24, and which is electrically connected to a ground pattern 231 of the circuit board 23. The unit holder 20 has a double shield consisting of a first electrostatic shield system leading from the unit casing 11 to the support pipe 30 through the outer cylinder body 21 and a second electrostatic shield system leading from the ground pattern 231 of the circuit board 23 to the shield cover conductor 43 through the inner cylinder body 22, and includes a synthetic resin-made cover member 25 formed into a cylindrical shape covering the outer cylinder body 21.

Claims

1. A microphone having a flexible pipe, comprising a microphone unit in which an electrostatic acousto-electric converter is housed in a metal-made unit casing;

a unit holder having a circuit board mounted with an impedance converter electrically connected to an output side of the acousto-electric converter; and

a metal-made support pipe having flexibility, in which the unit holder is supported on one end side of the support pipe;

the microphone unit is connected to the unit holder; and

a microphone cable consisting of a two-core shield covering cable is inserted through the support pipe, and one end side thereof is brought into the unit holder, wherein

the unit holder comprises a cylindrical outer cylinder body formed of a metallic material, one end side of which is fixed to the support pipe with electrical connection and the other end side of which is connected to a unit casing of the microphone unit with electrical connection;

a cylindrical inner cylinder body formed of a metallic material, which is arranged in the outer cylinder body, one end side of which is fixed to a shield cover conductor of the microphone cable with electrical connection, the other end side of which is mounted with the circuit board, and which is electrically connected to a ground pattern of the circuit board; and

a synthetic resin-made cover member formed into a cylindrical shape covering the outer cylinder body, and

is provided with a first electrostatic shield system leading from the unit casing to the support pipe through the outer cylinder body and a second electrostatic shield system leading from the ground pattern of the circuit board to the shield cover conductor through the inner cylinder body.

2. The microphone having a flexible pipe according to claim 1, wherein the outer cylinder body integrally comprises a large-diameter cylinder part connected to the unit casing and a small-diameter cylinder part fixed to the support pipe;

the inner cylinder body integrally comprises a large-diameter cylinder part mounted with the circuit board and a small-diameter cylinder part fixed to the shield cover conductor; and

the outside diameter of the large-diameter cylinder part of the inner cylinder body is approximately equal to the inside diameter of the large-diameter cylinder part of the outer cylinder body, whereby the inner cylinder body is supported coaxially in the outer cylinder body.