Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Patent
1992-02-14
1995-03-21
Isen, Forester W.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
381 24, H04R 1700
Patent
active
054004144
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a picture/sound reproducing device comprising a picture screen and at least two loudspeakers in the form of elektro-magnetical converters.
The invention is based on the object to reach a conformity (matching) of the spatial position of the source of the picture and the source of sound with such a device.
This tast is solved by the invention given in the claim 1. Advantageous further developments of the invention are given in the subclaims.
With clocks and miniature radios it is known (GB A 2 052 919) to provide on a glass pane covering a clockface or scale a piezo-polymeric foil serving as loudspeaker. This is not, however, a picture/sound reproducing device with a picture screen with which one tries to achive a matching of the spatial position of picture source and sound source. Also, here on the glass pane it is not a case where there are several electromechanical converters arranged in the form of piezo-polymeric foils.
In the DE-A 32 23 615 another electro-mechanical converter in the form of a piezo-polymeric foil has been described. Here, a particularly suitable material is given for a transparent piezo-electrical plastic foil for an electro-mechanical converter. This converter, however, is not arranged in the form of a loudspeaker on the picture screen of a picture/sound reproducing device.
It is further known (Patent Abstracts of Japan, Volume 9, No. 43 (E-298)(1766) Feb. 33, 1985) to provide in the corners of the front face of a television receiver housing outside the visible picture area electro-magnetical vibrators which cause oscillations of the front pane in front of the picture tube in the sense of a loudspeaker. Hereby, however, the front pane is made of regular glass and is not designed as a piezo-polymeric foil. Rather, the front pane constitutes no active electro-mechanical converter but is only stimulated to oscillate for the purpose of sound reproduction by the vibrators provided outside the picture area.
With the invention extra space for the loudspeaker is no longer required at the housing of the television receiver so that new options arise for the design of a television receiver. An optimum matching of the spatial position of picture source and sound source is achieved because picture and sound exactly originate from the same surface, namely the picture screen of the television receiver. Such a loudspeaker with a piezo-polymeric foil bears the advantage, particularly with a television receiver, that it generates no magnetic field which could interfere with the deflection in the picture tube.
The invention is illustrated with reference to the drawing. Therein is shown
FIG. 1 an example of a television receiver,
FIG. 2 an example of a picture,
FIG. 3 a further development of the invention for a loudspeaker to be controlled by means of a digital audio signal,
FIG. 4 a further development of FIG. 3 with ring-shaped foils,
FIG. 5 a section of FIG. 4 with a surface ratio true to scale,
FIG. 6 a further development of FIG. 5 for a television receiver,
FIG. 7 a further embodiment example of the invention, and
FIGS. 8-10 different views of FIG. 7.
FIG. 1 shows a television receiver 1 with the picture screen 2 and the operating elements 3. Affixed to the picture screen is the transparent piezo-polymeric foil 4, here represented in symbolic form by crosshatching, which cannot be seen in reality and which extends over the entire picture screen 2. The side of the foil 4 facing the picture screen 2 is connected with the ground potential of the television receiver. At two points, in particular outside the visible picture screen area the foil 4 is contacted. The thereby formed terminals 5 are being applied the audiofrequency ausio signal accompanying the picture reproduction. An additional loudspeaker at the left side, at the right side or below the picture screen 2 is no longer required.
FIG. 2 shows a picture with the frame 6, the forepart 7 itself of the picture and the glass pane 8 covering the forepart 7. Affixed onto the glass pane is the transparent piezo-polymeric f
Electronic-Werke Deutschland GmbH
Emanuel Peter M.
Isen Forester W.
Tripoli Joseph S.
Wein Frederick A.
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