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Switches for Side-Interchangeable Stereo Earphone Disclosure Number: IPCOM000015564D
Original Publication Date: 2002-Mar-15
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue



Disclosed is a device for a side-interchangeable stereo earphone. Some stereo earphones have symmetrical earpads (earphone bodies), and it is possible for a user to put the right-side earpad in (or over) the left ear and vice versa. When this happens, the user hears reversed stereo sound. This device enables users to use earpads without checking their sides for left or right. The device is a pair of switches that are built into the earpads, one each for the earpad on each side. These switches change the circuit in the earphone mechanically or electronically so that the right and left channel signals will be played from the speakers of the correct sides. When one of the switches is activated, the circuit changes the speaker on that side to be the right channel, and the speaker on the other side is the left channel. A user can put on this earphone without identifying the sides of the earpads. The only thing the user has to do is to touch the switch on the earpad in the right ear. Fig.1 shows an example of the device in which the sound signals are switched mechanically. The rounded squares A and B represent the earpads. Each earpad contains a speaker (A1 and B1), a switch (A2 and B2), racks (A3, A5, B3, and B5) and a pinion gear (A4 and B4). Racks A5 and B5 are connected to each other by a wire that is covered with a flexible tube, so that the movement of one rack is transmitted to the other. In this figure, the speaker A1 plays the left channel sound and the speaker B1 plays the right channel sound. If the switch (button) B2 is pressed in this condition, the rod under the button cannot reach the rack B3, and nothing happens. The speaker B1 is still set for the right channel sound. 1