JPS62169590U

JPS62169590U -

Info

Publication number: JPS62169590U
Application number: JP5703786U
Authority: JP
Priority date: 1986-04-16
Filing date: 1986-04-16
Publication date: 1987-10-27

Description

[Brief explanation of the drawing]

第１図はこの考案の第１実施例を示す斜視図、
第２図ａ，ｂは背面開口率の変化状態を示す断面
図、第３図はこの考案の第２実施例を分解して示
す斜視図である。図面中、１はヘツドホンユニツト、２は開口、
３はユニツトケース、６は調整リング、７，８は
窓孔、１２は突起部、１５はリミツトスイツチで
ある。 FIG. 1 is a perspective view showing the first embodiment of this invention;
FIGS. 2a and 2b are cross-sectional views showing changes in the rear aperture ratio, and FIG. 3 is an exploded perspective view showing a second embodiment of this invention. In the drawing, 1 is a headphone unit, 2 is an opening,
3 is a unit case, 6 is an adjustment ring, 7 and 8 are window holes, 12 is a projection, and 15 is a limit switch.

Claims

[Claims for Utility Model Registration] (1) A rear aperture ratio adjusting means provided on the back surface of a headphone unit including a diaphragm and its driving means and for continuously changing the aperture ratio of the back surface; 1. A headphone comprising: a switch that cuts off an input signal to the headphone unit when the headphone reaches a predetermined size. (2) In paragraph 1 of the claims for utility model registration,
The rear aperture ratio adjusting means includes a cylindrical part formed in a unit case holding the headphone unit, and an adjustment ring rotatably fitted into the cylindrical part, and the cylindrical part and the adjustment ring have a relative window holes that are opened and closed by rotation, and one of the cylindrical portion and the adjustment ring is provided with the switch, and the other is provided with an operating member that turns the switch on and off. headphone. (3) In paragraph 1 of the claims for utility model registration,
The back aperture ratio adjusting means has a disc body rotatably attached to the back surface of the headphone unit, and has a through hole for selectively opening and closing the aperture.
A headphone characterized in that the switch is provided on one of the back surface and the disc body, and an operating member for turning the switch on and off is provided on the other.