BOUNDARY MICROPHONE

• US 20110019857A1
• Filed: 07/20/2010
• Published: 01/27/2011
• Est. Priority Date: 07/22/2009
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Audio-technica
• Original Assignee: Kabushiki Kaisha Audio-technica
• Inventors: Matsui, Noriko
• Granted Patent: US 8,699,739 B2
• Time in Patent Office: Days
• US Class Current: 381/356
• CPC Class Codes: H04R 1/406 microphones
• CPC Class Codes: H04R 2201/025 Transducer mountings or cabinet supports enabling variable orientation of transducer of cabinet
• CPC Class Codes: H04R 5/027 Spatial or constructional arrangements of microphones, e.g. in dummy heads

Abstract

A boundary microphone includes: a base made of metal; a cover that is made of metal and has a plurality of holes through which a sound wave is guided; a microphone unit that converts sound into an electric signal; and a microphone unit holder slidably provided on the base and holds the microphone unit. The microphone unit holder has a knob. The base has a hole through which the knob of the microphone unit holder penetrates the base. The knob of the microphone unit holder and the hole the base are so provided that the microphone unit holder can be moved with the microphone unit by a movement of the knob within a range defined by the hole.

Claims

1. A boundary microphone comprising:

a base made of metal;

a cover that is made of metal and has a plurality of holes through which a sound wave is guided;

a microphone unit that converts sound into an electric signal; and

a microphone unit holder slid-ably provided on the base and holds the microphone unit, wherein

the microphone unit holder has a knob,

the base has a hole through which the knob of the microphone unit holder penetrates the base, and

the knob of the microphone unit holder and the hole of the base form a microphone unit position changing unit with which the microphone unit holder is able to move with the microphone unit by a movement of the knob within a range defined by the hole.

2. The boundary microphone according to claim 1, wherein three such microphone units are radially arranged on the base.

3. The boundary microphone according to claim 2, wherein

the base has a cord insertion hole through which an internal space covered by the cover and outside are communicated, and

the cord insertion hole is provided at an intersection point of center axis lines of the radially-arranged three microphone units.

4. The boundary microphone according to claim 3, wherein

a tubular shaft is fitted in the cord insertion hole,

a cord is inserted in the tubular shaft, and

two of the microphone unit holders are slidably provided around the tubular shaft.

5. The boundary microphone according to claim 2, wherein

two of the microphone unit holders are able to slidably move, and

the two microphone unit holders each has the knob.

6. The boundary microphone according to claim 5, wherein

the base has a cord insertion hole through which an internal space covered by the cover and the outside are communicated, and

the cord insertion hole is provided at an intersection point of center axis lines of the radially-arranged three microphone units.

7. The boundary microphone according to claim 6, wherein

a tubular shaft is fitted in the cord insertion hole,

a cord is inserted in the tubular shaft, and

the two microphone unit holders are slidably provided around the tubular shaft.

8. The boundary microphone according to claim 5, wherein

the three microphone units have angular intervals of 120 degrees in a circumferential direction in a case where the two microphone unit holders each having the knob are each positioned at an end of the hole of the base, and

the two microphone units held by the two respective microphone unit holders have angular interval of 180 degrees in the circumferential direction in a case where the two microphone unit holders are each positioned at another end of the hole of the base.

9. The boundary microphone according to claim 8, wherein

the base has a cord insertion hole through which an internal space covered by the cover and the outside are communicated, and

the cord insertion hole is provided at an intersection point of center axis lines of the radially-arranged three microphone units.

10. The boundary microphone according to claim 9, wherein

a tubular shaft is fitted in the cord insertion hole,

a cord is inserted in the tubular shaft, and

the two microphone unit holders are slidably provided around the tubular shaft.

11. The boundary microphone according to claim 8, wherein, in the case where the two microphone units held by the two respective microphone unit holders have angular interval of 180 degrees in the circumferential direction, a remaining one microphone unit faces a direction perpendicular to a line connecting centers of the two microphone units.

12. The boundary microphone according to claim 11, wherein

the base has a cord insertion hole through which an internal space covered by the cover and the outside are communicated, and

the cord insertion hole is provided at an intersection point of center axis lines of the radially-arranged three microphone units.

13. The boundary microphone according to claim 12, wherein

a tubular shaft is fitted in the cord insertion hole,

a cord is inserted in the tubular shaft, and

the two microphone unit holders are slidably provided around the tubular shaft.

14. The boundary microphone according to claim 1, wherein planer shapes of the cover and the base are circular.