JPS61187498A - Dynamic microphone unit - Google Patents

Abstract

PURPOSE:To obtain performance on of a stable acoustic characteristic at low cost by providing plural wings supporting and fixing an acoustic filter to a case integrally molding a magnetic circuit section, and requiring no rear surface plate. CONSTITUTION:An upper surface of a synthetic resin case 10 integrally molding thereon a magnetic circuit section 9 comprising a magnet 9a, magnetic yoke 9b and a pole piece 9c is concaved so as to fit the magnetic yoke 9b, and at a center thereof, there is provided a fitting pole 10b of the magnet 9a, the magnetic yoke 9b and the pole piece 9c. On the lower surface of the synthetic resin case 10, plural wings 10a are radially disposed. A voice coil 13 attached to an equalizer 11, an oscillating plate 12 and a window section 14a disposed on a terminal plate 14 and an acoustic filter 15 are indicated respectively. The acoustic filter 15 and the terminal plate 14 supported and fixed by the plural wings 10a disposed on the synthetic resin case are attached without spacing. By setting an area of the window section 14a disposed at a part of the terminal plate 14, a stabilized acoustic characteristic is obtained and the number of parts can be reduced.

Description

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

Prior Art FIG. 3 shows the configuration of a conventional dynamic microphone unit. In FIG. 3, a synthetic resin case 2 is integrally molded with a magnetic circuit section 1 consisting of a magnet la, a magnetic yoke 1b, and a pole piece IC. Equalizer 3
．． Vibration plate 4. A voice coil 5 attached to the diaphragm 4. Terminal board 6. It consisted of an acoustic filter 7 and a rear plate 8.

Problems to be Solved by the Invention However, in the above-mentioned dynamic microphone unit, the rear plate is only intended to fix the acoustic filter, and does not contribute to ensuring performance in terms of acoustic characteristics, resulting in high cost. There was a drawback.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and to provide a dynamic microphone unit having stable acoustic performance at a low cost.

Means for Solving the Problems In order to achieve the above object, the present invention provides a case in which a magnetic circuit part is integrally molded with a plurality of wings for supporting and fixing an acoustic filter, thereby eliminating the need for a rear panel. It is.

Function The present invention has the following effects due to the above-described configuration. In other words, the acoustic filter is supported and fixed by a plurality of wings provided in the case in which the magnetic circuit part is integrally molded.
The acoustic characteristics can be controlled by the area of the window provided in the center of the terminal board, and the number of parts can be reduced.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention, and FIG. 2 is a partially detailed perspective view of the embodiment of the present invention. 1 and 2, 9a is a magnet, 9b is a magnetic yoke, 9c is a pole piece, 9 is a magnetic circuit section consisting of magnet 9a, magnetic yoke 9b, and pole piece 9C, and 10 is a part of the magnetic circuit section 9. It is a molded synthetic resin case, and its upper surface is recessed so that a magnetic yoke 9b can be fitted therein, and a fitting column 10b for the magnet 9a, magnetic yoke 9b, and pole piece 9c is provided in the center. Further, on the lower surface of the synthetic resin case 10, as shown in FIG. 2, a plurality of wings 10a are provided radially. 11 is an equalizer, 12 is a diaphragm, 13 is a voice coil attached to the diaphragm 12,
14 is a terminal board.

14a is a window provided on the terminal plate 14, and 15 is an acoustic filter.

In this case, a plurality of wings 1 provided with a synthetic resin case IOK
The acoustic filter 15 supported and fixed from 0afc and the terminal plate 14 are attached without any gaps, and by setting the area of the window 14a provided in a part of the terminal plate 14, stable acoustic characteristics can be obtained, and the parts The number can be reduced.

Effects of the Invention As is clear from the above embodiments, the present invention is a case in which a magnetic circuit part is partially molded, and a plurality of wings for supporting and fixing an acoustic filter are provided on a part of the case. This has the effect that it is possible to realize a dynamic microphone unit with stable acoustic characteristics at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a dynamic microphone unit according to an embodiment of the present invention, FIG. 2 is a partially enlarged perspective view of FIG. 1, and FIG. 3 is a side sectional view of a conventional dynamic microphone unit. 9... Magnetic circuit section, 9a... Magnet, 9b... Magnetic yoke, 9c... Pole piece, 10... Synthetic resin case, 10a... Wing, 10b... Fitting column. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Claims] A dynamic microphone unit in which a plurality of wings are provided radially on the lower surface of a case that fixes a magnetic circuit section, and an acoustic filter is supported on the wings.