Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B21/00—Projectors or projection-type viewers; Accessories therefor
  • G03B21/54—Accessories
  • G03B21/56—Projection screens
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
  • H04N5/642—Disposition of sound reproducers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
  • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/005—Details of transducers, loudspeakers or microphones using digitally weighted transducing elements

Definitions

• the invention is based on a loudspeaker according to the preamble of claim 1.
• Such films serving as transducers require a relatively large area such as e.g. the surface of a sphere.
• the invention has for its object to provide a loudspeaker with a piezopolymeric film as a transducer that requires virtually no additional space.
• the film is thus on a transparent plate, insbeson particular a glass surface, is applied, the already ddarwolf for a passage of light, an image viewer, a Bil 'or the like. Is needed. The space requirement for the loudspeaker is therefore practically zero.
• the transparent film applied to the screen in the case of a television receiver or a monitor has several advantages. No additional space is required for the loudspeaker on the housing of the television receiver, so that there are novel design possibilities open a television receiver. There is an optimal match in the spatial position of the image source and the sound source, since the image and sound originate from exactly the same area, namely the screen of the television receiver.
• a loudspeaker with a piezopolymeric film has the advantage in particular in the case of a television receiver that it does not generate a magnetic field which could interfere with the deflection in the picture tube.
• the invention is also applicable to conventional images, such as those found generally in living rooms. Then the surface already taken up by the picture on the wall can additionally serve as a loudspeaker.
• the loudspeaker can also be implemented on other panes such as car windows, aircraft windows, lights, lamps, spectacle lenses, measuring devices, clocks and the like.
• the film is preferably applied to a glass pane. However, the invention can also be used when a glass pane is not absolutely necessary. In the case of an image without a glass pane, the film can also be applied directly to the original image.
• the film has such a transparency that the passage of light or the viewing of an image lying behind the film is practically not disturbed, that is to say the film is not perceived by the viewer at all.
• the invention thus opens up novel, distributed application areas for such a transparent piezopolymeric film.
• Fig. 1 shows an example of a television receiver
• Fig. 2 shows an example of a picture
• Fig. 3 shows a development of the invention for a
• FIG. 3 shows a detail from FIG. 4 with scale
• FIG. 6 is a development of Fig. 5 for a
• FIGS. 8-10 different views of FIG. 7.
• the screen 1 shows a television receiver 1 with the screen 2 and the operating elements 3.
• the screen 2 has the transparent piezopolymeric film 4 shown in cross hatching, which in reality cannot be seen, and which extends over the entire screen 2.
• the side of the film 4 facing the screen 2 is connected to the ground potential of the television receiver.
• the film 4 is contacted at two points, in particular outside the visible screen area.
• the LF audio signal belonging to the image reproduction is applied to the terminals 5 formed thereby.
• An additional loudspeaker on the left, right or below the screen 2 is no longer required.
• FIG. 2 shows a picture with the frame 6, the actual picture template 7 and the glass pane 8 covering the picture template 7.
• the transparent piezopolymeric film 4 serving as a loudspeaker is applied to the glass pane, which, as in FIG Terminals 5 is ge ge controlled with an audio signal and serves as a speaker.
• An adjustment means 9 for the volume of the sound field generated by the film 4 is also built into the frame 6.
• the film 4 is divided into a large number of individual films, the area ratios of which are graduated in powers of two.
• the areas of the Individual partial films therefore have values of x, 2x, 4x, 8x, 16x, 32x, 64x, 128x.
• the differently valued bits of a digital signal are applied to the individual partial foils, each forming a loudspeaker.
• the partial foils thus each generate a sound field in accordance with the digital signal.
• the sum of the sound fields emanating from the individual partial foils, which corresponds to the actual analog sound signal, is perceived by the listener.
• Such a loudspeaker acts as a mechanical digital-to-analog converter.
• FIG. 4 shows a further development in which the implementation of foils with such different surfaces is simplified.
• FIG. 5 shows a sector-shaped section broken off on all sides from an arrangement according to FIG. 4, in which the areas of the individual foils 10 to 18 are shown to scale according to the power of two.
• the screen 20 of a television receiver is divided by a diagonal into two approximately triangular areas.
• Each of these two triangular surfaces contains five segment-shaped foils 10 to 14 according to FIG. 5.
• the two triangular, identical arrangements can then be used to reproduce a stereo sound signal.
• two vertically standing housing parts 22, 23 are arranged on a horizontally arranged foot part 21 at a distance A.
• the foot part 21 contains low-frequency loudspeakers 24, while the housing parts 22, 23 contain broadband loudspeakers 25 and high-frequency loudspeakers 26.
• a screen 27 for projecting an image from a television projector, a slide projector, a film projector or the like is arranged in the opening formed by the parts 21, 22, 23.
• the canvas 27 can be lowered into the foot part 21 by means of a winding device 28.
• the foot part 1 contains an infrared receiver 29 for the signals of a remote control unit 30, with which parameters of the sound reproduction such as volume, treble, bass and stereo balance can be remotely operated via actively designed boxes.
• FIG. 8 is a top view of the arrangement according to FIG. 7. The screen 7 is tightly clamped between the housing parts 22, 23.
• the foot part 21 and the housing parts 22, 23 are combined to form a compact unit, the canvas 27 being sunk in the foot part 21.
• FIG. 10 shows a top view of how the screen 27 is guided on the housing parts 22, 23 by means of guides 32, so that it is as flat as possible for a perfect image projection and does not become wavy.
• the housing parts 22, 23 can be designed so that they can be placed on the foot part 21 at different distances A in order to accommodate the canvases with different aspect ratios A / B.
• the following values are essentially considered for the aspect ratio:
• the canvas 27 is provided with a piezopolymeric film that extends over the entire surface or a part of the surface, or is itself designed as such a film.
• a piezopolymeric film forms a membrane with a piezoelectrically controllable thickness and can additionally serve as a loudspeaker, in particular as a mid-range loudspeaker.
• the changes in thickness of the film when it acts as a loudspeaker membrane are only a few ⁇ m and have ben no negative influence on the image reproduction.
• the film is preferably divided into two separate films along a vertical center line, each of which forms a loudspeaker for stereo sound reproduction.
• the film serving as a loudspeaker can also be arranged behind the screen 27 in the viewing direction.
• the projection screen can be a conventional screen or can also consist of plastic or another plastic. It may • be a transparent wall also "suitable for rear projection wall.
• On the Giions ⁇ may be additionally arranged a -Verierrungslinse for the image, called a Fresnel lens.
• the Schwarzi ⁇ onswand may be a rigid wall or also be designed to be windable.

Applications Claiming Priority (6)

Publications (1)

Family

ID=27198275

Family Applications (2)

Family Applications Before (1)

Country Status (9)

Families Citing this family (39)

Family Cites Families (6)

• 1989
  • 1989-09-16 EP EP89117183A patent/EP0361249B1/de not_active Expired - Lifetime
  • 1989-09-16 ES ES198989117183T patent/ES2031328T3/es not_active Expired - Lifetime
  • 1989-09-16 EP EP89910614A patent/EP0435914A1/de active Pending
  • 1989-09-16 DE DE8989117183T patent/DE58901033D1/de not_active Expired - Fee Related
  • 1989-09-16 HU HU895540A patent/HU206579B/hu not_active IP Right Cessation
  • 1989-09-16 WO PCT/EP1989/001076 patent/WO1990003711A1/de not_active Application Discontinuation
  • 1989-09-16 KR KR1019900701088A patent/KR0126138B1/ko not_active IP Right Cessation
  • 1989-09-16 JP JP1509956A patent/JPH04501046A/ja active Pending
  • 1989-09-26 US US07/678,351 patent/US5400414A/en not_active Expired - Fee Related
• 1992
  • 1992-06-23 GR GR920401342T patent/GR3005002T3/el unknown

Non-Patent Citations (1)

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