JPS62196A - Directive dynamic microphone unit - Google Patents

Abstract

PURPOSE:To prevent the deterioration of acoustic performance and to stabilize an acoustic performance by placing the acoustic filter of a phase shifting circuit in a space. CONSTITUTION:After sticking a phase shifting circuit acoustic filter 6 on the outer peripheral face of an opening 10 for a phase shifting circuit acoustic terminal provided on a case 5, the case 5 is combined with a synthetic resin case 2 that is molded with a magnetic circuit section 1 integrally, and the case 5 clamped and fixed to the synthetic resin case 2 by the screw part 2c of the synthetic resin case 2 and a screw part of the case 5. Thereby, the phase shifting circuit acoustic filter 6 is housed in the space 10a formed by the synthetic resin case 2 and case 5. Thus, the soiling of the phase shifting circuit acoustic filter 6 caused by handling and the deterioration of acoustic performance due to the sticking of dust can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a directional dynamic microphone unit mainly used for vocals and speeches.

BACKGROUND OF THE INVENTION FIG. 2 shows the configuration of a conventional directional dynamic microphone unit. In FIG. 2, magnet 11a,
A synthetic resin case 1 in which a part of the magnetic circuit section 11 composed of the magnetic yoke llb and pole piece llc is molded.
2, diaphragm 13, voice coil 14 attached to diaphragm 13, case 15, phase shift circuit acoustic filter 16, rear acoustic filter 17, rear case 18, equalizer 19
It was composed of.

Problems to be Solved by the Invention However, in the above-mentioned directional dynamic microphone unit, the phase shift circuit acoustic filter 16 is exposed on the outer surface, which causes deterioration of acoustic performance due to dirt and dust adhering during handling. However, it is an object of the present invention to eliminate these drawbacks and provide a directional dynamic microphone unit with stable acoustic performance.

Means for Solving the Problems In order to achieve the above object, the present invention provides a gap formed by a case in which a magnetic circuit part of a phase shift circuit acoustic filter is molded and a case having an opening for a phase shift circuit acoustic terminal. It is attached to the aperture inside the unit to prevent deterioration of acoustic performance.

Effect: Therefore, according to the present invention, the phase shift circuit acoustic filter is housed in the gap, which has the effect of preventing deterioration of acoustic performance and stabilizing the acoustic performance.

Example FIG. 1 shows the configuration of an example #A of the present invention.

In Figure 1, 1a is a magnet, 1b is a magnetic yoke, 1c
1 is a pole piece, 1 is a magnetic circuit section, 2 is a synthetic resin case in which a part of the magnetic circuit section 1 is molded, and its upper surface is recessed so that a magnetic yoke 1b can be fitted therein, and a magnet 1a% magnetic yoke is placed in the center of the case. lb, the fitting column 2b of the pole piece 1c is provided. Further, a sound wave introducing hole 2b is provided on the outer periphery of the synthetic resin case 2, and a threaded portion 2c is provided on the inner periphery of the lower end of the synthetic resin case 2. 3 is a diaphragm, 4 is a voice coil attached to the diaphragm 3, and 5 is a case, the upper outer peripheral surface of which has openings lO for a plurality of phase shift circuit acoustic terminals.
The outer periphery of the case 5 is provided with a threaded portion 5a that meshes with a threaded portion 2C provided on the synthetic resin case 2. 6 is a phase shift circuit acoustic filter, 7 is a rear acoustic filter, 8 is a rear case, and 9 is an equalizer.

In this case, after pasting the phase shift circuit acoustic filter 6 on the outer peripheral surface of the opening lO for the phase shift circuit acoustic terminal provided in the case 5, the case 5 is attached to the synthetic resin case 2 in which the magnetic circuit part 1 is partially molded. By combining and fixing the case 5 to the synthetic resin case 2 using the threaded part 2c of the synthetic resin case 2 and the threaded part 5a of the case 5, the phase shift circuit acoustic filter 6 can be connected to the synthetic resin case 2 and the case 5. By storing it in the gap 10a, it is possible to prevent the acoustic performance from deteriorating due to dirt and dust adhering to the phase shift circuit acoustic filter 6 due to handling.

Effects of the Invention As is clear from the above embodiments, the present invention provides a gap formed by a case in which a part of the magnetic circuit part of a phase shift circuit acoustic filter is molded and a case having an opening for a phase shift circuit acoustic terminal. This has the effect of realizing a directional dynamic microphone unit that is excellent in preventing deterioration of acoustic performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a directional dynamic microphone unit according to an embodiment of the present invention, and FIG. 2 is a sectional side view of a conventional directional dynamic microphone unit. DESCRIPTION OF SYMBOLS 1... Magnetic circuit section, 2... Synthetic resin case, 5... Case, 6... Phase shift circuit acoustic filter, 10...・Open hole, lOa...
...Gap area. Name of agent: Patent attorney Toshio Nakao and one other person Figure 2

Claims (1)

[Claims] It has a first case in which a magnetic circuit part is molded and a second case provided with an opening for a phase shift circuit acoustic terminal, a part of the second case is located inside the first case, and A directional dynamic microphone unit, wherein the first and second cases are coupled together to form a gap, and a phase shift circuit acoustic filter is attached to the opening in the gap.