Patent Application
20150036865
1. Field of the Invention
The invention generally relates to an electrical signal to audio signal transducer. More particularly, the invention relates to an electrical signal to audio signal transducer that is characterized with a higher efficiency and a smaller width.
2. Description of the Prior Art
As of now, loudspeakers may be categorized into six types: moving coil driver, electrostatic driver, ribbon driver, electric arc driver and piezoelectric film driver and electret driver. Speaker of electrostatic driver requires a high voltage. Ribbon driver can not generate low-frequency sounds. Electric arc driver generates toxic gases. Piezoelectric film speaker requires a special circuit and can not generate low-frequency sounds. Electret driver requires a bigger space and can not generate low-frequency sounds. Therefore, the most common type is moving coil driver in which audible sounds are generated by a voice coil and a diaphragm fitted to a truncated cone-shaped basket.
In a moving coil speaker, a voice coil is disposed near a magnet. As current flows through the voice coil, a magnetic field is induced. Then this magnetic field interacts with the magnetic field of the magnet. The result of this interaction causes the voice coil and a diaphragm attached to the voice coil to move back and forth to generate audible sounds.
Modern electronic products (such as mobile phones, tablet computers and notebook computers) become thinner and more compact. In the moving coil speakers, magnet has to be made smaller and this would result in poor performance. In addition, because the area of displacement of a diaphragm in its reciprocating motion corresponds to the magnitude of the audible sounds generated by the diaphragm, the dimensional constrain would adversely affect the amplitude.
The object of the present invention is to provide an electrical signal to audio signal transducer that can enhance performance.
To reach the object, the electrical signal to audio signal transducer with a deformable diaphragm unit of the present invention is disclosed. The electrical signal to audio signal transducer of the present invention comprises a connective portion and a deformable diaphragm unit. A through opening is provided in the connective portion. The outer side of the connective portion is connected with the wall of a box. The outer side of the deformable diaphragm unit is connected with the through opening of the connective portion, and the inner side of the deformable diaphragm unit is connected with a voice coil. Push and pull exerted on the deformable diaphragm unit by the magnetic force induced by the current flows through the voice coil can cause the deformable diaphragm unit to deform and move in a reciprocating manner and thus generate audible sounds.
Please refer to
Now, please see
Now, please refer to
Now, we plug numerical values and corresponding ratios into these two equations. In the present invention, AB=10, the angle CDF=45 degree, CD=FD=GH=0.5, BC=FE=CD×(√2−1)/√2, EC=BF=GF=ED=CD/√2.
Therefore,
“The area of displacement of the diaphragm in the prior art speaker”:“The area of displacement of the diaphragm unit in the speaker of the present invention”
=GH×GF:(AB×BC)/2+(EC×ED)/2+BF×FE
=0.5×CD/√2:(10×(CD×(√2−1)/√2))/2+(CD/√2)×(CD/√2)/2+(CD/√2)×(CD×(√2−1)/√2)
=0.5×0.5/√2:(10×(0.5×(√2−1)/√2))/2+(0.5/√2)×(0.5/√2)/2+(0.5/√2)×(0.5×(√2−1)/√2)
=1:4.788
Therefore, because the speaker of the present invention has 4.788 times of the area of displacement, the speaker of the present invention has 4.788 times of the volume of air displacement as compared to the prior art speaker. In addition, because in a unit time, air must pass the same size of opening, air travels 4.788 times fastener in the speaker of the present invention. According to the Newton's kinematics, E=½MV2; therefore, the kinetic energy of air in the speaker of the present invention is 109 times higher (4.788×4.7882=109 because the mass of air becomes 4.788 times too). Therefore, in the speaker of the present invention, the kinetic energy of the audible sounds become 109 times or an increase of 20.3 dB (10 log(109)=20.3 dB).
A deformable diaphragm unit in a different shape would operate differently and have a different magnitude of audio output. In
As illustrated in
Now, we may plug in actual numerical values. In the third embodiment, the area of displacement=HBCD−ABCD=12.19 (because AJ=HD=20.56, angle BAC=2.54 degree, angle BHD=5.58 degree, JC=CD=2, BC=1, angle BCD=120 degree (so AH=BG=0.34)). In the moving coil speaker of the prior art, the area of displacement=BC×BG=0.34. Therefore, the ratio is 12.19:0.34=35.5 times. In addition, because in a unit time, air must pass the same size of opening, the mass of air traveling through the opening in a unit time is 35.5 times more and air travels 35.5 times fastener in the third embodiment speaker of the present invention. According to the Newton's kinematics, E=½MV2, the kinetic energy of air in the third embodiment of the present invention is 44,770 times higher (the ratio of kinetic energy=35.53=44,770). Therefore, in the speaker of the present invention, the kinetic energy of the audible sounds becomes 44,770 times higher or an increase of 20.3 dB (10 log (44,770)=46.5 dB).
From the above, we can see that the electrical signal to audio signal transducer with a deformable diaphragm unit of the present invention meets the relevant patent requirements. It is hoped that the patent application will be approved.
Many changes and modifications in the above described embodiments of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claims.
