GB2408890A

GB2408890A - Vacuum loudspeaker system

Info

Publication number: GB2408890A
Application number: GB0322076A
Authority: GB
Inventors: Eugenie Sergeyevich Aleshin
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-22
Filing date: 2003-09-22
Publication date: 2005-06-08
Also published as: GB0322076D0

Abstract

The loudspeaker system has a rear chamber with a static pressure lower than that on the opposite side of the diaphragm. The loudspeaker system comprises an enclosure hermetically sealed and providing gas pressure differences within and outside the vacuum loudspeaker system, a diaphragm 1 covered with a conductor, a flexible suspension 4 acting like a mechanical spring and mounted in the enclosure of the vacuum loudspeaker system to compensate offsetting the diaphragm under affecting of the gas pressure differences within and outside the vacuum loudspeaker system. Actuator means to vibrate the diaphragm so as to produce sound consists of conductors placed in a parallel way on the diaphragm 1 and at least one conductor 2,3 mounted in the enclosure. The conductor covering the diaphragm and the at least one conductor mounted in the enclosure have separate feeding that is an ac electric signal for one conductor and is an ac rectified full-wave electric signal for another conductor.

Description

VACUUM LOUDSPEAKER S\bM This invention relates to a loudspeaker system

having a rear chamber with a static pressure lower than that on the opposite side of the diaphragm.

Conventional loudspeaker systems, for example, sealed box types, employ a large rear chamber to prevent sound from being radiated by the rear side of the loudspeaker diaphragm. This situation often results in inconveniently large enclosures being necessary.

Accordingly, it is an object of the present invention to eliminate all of the above disadvantage and give new properties to a loudspeaker for improving its operation.

It is a further object of this invention to provide an extremely small rear enclosure for a loudspeaker.

A still further object of this invention is to provide a lower static pressure in the rear chamber of a loudspeaker system that reduces the resonance frequency of the enclosures thereby allowing for a small enclosure.

Another object of this invention is to provide a flexible and elastic suspension between a loudspeaker enclosure and a diaphragm being radiated sound when the flexible suspension simultaneously acts like a mechanical spring to counteract the static force on the front of the diaphragm produced by a low static pressure behind the diaphragm.

A still another object of this invention is to provide high efficiency of the loudspeaker operation by separate feeding conductors placed on a diaphragm being radiated sound and conductors mounted hard in a loudspeaker enclosure by electric signals of the alternating and fullwave current rectified from the same signals.

Actuator means of a loudspeaker adapted to vibrate a diaphragm so as to be to produce sound may be also made as usual components of a voice coil dynamic loudspeaker unit such as radiating diaphragm, voice-coil, voicecoil former, spider, magnet and enclosure. Other arrangements, such as a linear bearing of the diaphragm being radiated sound can also be used.

According to the present invention there is provided a device comprising a hard diaphragm 1 covered with a conductor, a perforated and acoustically transparent conductor 2 mounted hard in an enclosure 5 by a cross-piece 6, a flexible suspension 4 mounted in the enclosure 5 and in the diaphragm 1, herewith the flexible suspension 4 acts like a mechanical spring to compensate offsetting the diaphragm 1 under affecting of gas pressure differences PI outside the enclosure 5 and P2 within the enclosure 5, the enclosure 5 being hermetically sealed providing the gas pressure differences on the front of the diaphragm 1 and behind it, herewith the conductors 2 and 3 are connected in series and connected up to output contacts 7 and 8, and the conductor covered the diaphragm I is connected up to output contacts 9 and 10, the conductors 2 and 3 and the conductor covered the diaphragm I are able to be made, e.g. like Archimedes spiral, squire or rectangle.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which: i Figure 1 shows in perspective, the loudspeaker in diameter position.

Figure 2 shows the most preferable block diagram of feeding the loudspeaker by a sound frequency of the alternating and rectified fullwave current.

According to the present invention this device shown in Figures I and 2 operates as follows.

The hermetically sealed enclosure 5 provides the gas pressure differences P 1 and P2 within and outside the enclosure 5, the hard diaphragm 1 is displaced by affecting the gas pressure differences Pi and P2 and is displaced into inside the enclosure 5 and is installed at the equal distance from the conductors 2 and 3 due to the flexibility of the suspension 4 acted like a mechanical spring, herewith the alternating current of a signal is given to the output contacts 9 and 10 that allows to vibrate the diaphragm 1 so as to produce sound. The rectified fullwave current of the same signal is given to the output contacts 7 and 8 that allows to vibrate the diaphragm 1 so as to produce sound, herewith the alternating current of the signal can be given to the output 7 and 8, and the rectified full-wave current can be given to 9 and 10, accordingly.

The sound is radiated by the diaphragm 1 and passes through the perforated and acoustically transparent conductor 2 into surrounding space.

Claims

CLAIM

In a vacuum loudspeaker system comprising an enclosure hermetically sealed providing gas pressure differences within and outside the vacuum loudspeaker system, a diaphragm covered with a conductor, a flexible suspension acting like a mechanical spring and mounted in the enclosure of the vacuum loudspeaker system to compensate offsetting the diaphragm under affecting of the gas pressure differences within and outside the vacuum loudspeaker system, actuator means adapted to vibrate the diaphragm so as to produce sound consisting of conductors placed in a parallel way on the diaphragm and, at least, one conductor mounted hard in the enclosure, herewith the conductor covered the diaphragm and, at least, one conductor mounted in the enclosure have separate feeding that is an ac electric signal for one conductor and is an ac rectified full- wave electric signal for another conductor.