CZ58498A3 - Greetings card or the like card - Google Patents

Abstract

A greetings or the like card (144), characterised by a board (2) forming at least part of the card and in that the board is a distributed mode acoustic radiator having a transducer (9) mounted wholly and exclusively on the radiator to vibrate the radiator to cause it to resonate.

Description

Technical field

The invention relates to greeting cards or the like.

BACKGROUND OF THE INVENTION

Patent application GB-A-2262861 discloses a panel loudspeaker design comprising a multifunctional radiating element constituting a unit sandwich panel formed from two surface layers of material with a spatial core of a transverse lightweight structure, arranged such that its flexural stiffness ratio (CB) in all directions to the square of the mass of the panel per unit area of the surface area of at least 10, and which further comprises a fastener which carries the panel or attaches it to the carrier freely and without damping, and further comprises an electromechanical excitation means coupled to the panel; serves to drive multi-modal resonance in the radiator panel in response to an electrical input within the loudspeaker operating frequency band.

US-A-3,247,925 to VARNAKA discloses the importance of a low-frequency resonant panel loudspeaker mounted on a frame and excited by an electromagnetic transducer mounted on this frame.

SUMMARY OF THE INVENTION

The present invention uses members whose type, structure and arrangement are generally and / or obtainable from the description of our co-pending PCT Application No. WD97 / 09842, from the same.

data. Such members have the ability to maintain and propagate the input vibration energy by bending waves in the operating region or in the operating regions extending transversely to their thickness, often but not necessarily to their edges, these members being arranged with or without anisotropy of bending strength, with vibration components of the resonant modes distributed in this region, preferably for acoustically communicating with the environment and with predetermined preferential locations in the region for locating the transducer, in particular for its operating or moving parts, which are effective with respect to acoustic vibration usually electrical area and signals corresponding to the acoustic content of this vibration activity i.

Use is envisaged in the present application

PCT No. V097 / 09842, from the same date, for these members as or in passive ”acoustic devices without transducers, such as reverberation or acoustic filtering or acoustic sounding of a room or room, and as or in active acoustic transducers, as in remarkably a wide range of audio sources or loudspeakers when powered by input signals for conversion to said audio or as microphones when exposed to audio for conversion to other signals.

In particular, the present invention relates to congratulatory cards or the like with embedded acoustic devices, for example in the form of loudspeakers.

The term "congratulatory card" is intended to include analogous letters such as advent calendars and the like.

Said members are referred to as distributed radiation elements and are to be marked as in said PCT application and / or otherwise as specifically provided herein.

The invention consists of a congratulatory card or the like having at least one sheet, the nature of which is to comprise a loudspeaker consisting of a carton forming a sheet.

- 3 of this ticket,

wherein the carton is comprised of a member capable of maintaining and expanding the input vibration energy by bending waves in at least one operating region extending to its thickness with resonant mode vibration components distributed at least in that region, and with predetermined preferred locations in the region for locating the transducer.

wherein the transducer is mounted on the member at one of these locations, to cause the member to vibrate, to generate its resonance, forming an acoustic radiating panel producing an acoustic output during resonation.

This member may have a lightweight core sandwiched between two cover layers.

This member may be provided with a foamed plastic core arranged sandwiched between the cardboard cover layers.

The transducer may be a piezoelectric bending member.

The cross-section may be crystalline. The ticket may contain a courier

And a control means associated with these blades for actuating the drive control when the blades move relative to one another.

The ticket may be provided with a signal generator, an amplifier and an electrical cell on one sheet to power the drive. Said member may be adapted for printing.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail with reference to the drawing, in which Fig. 1 is a schematic representation of an exploded loudspeaker as described and claimed in our co-pending International Application No. WO97 / 09842; Fig. 1b is an enlarged and cross-sectional view of the loudspeaker of Fig. 2a showing two alternative constructions; Fig. 3 is a schematic and perspective view of an embodiment of the congratulatory card of the present invention; and Fig. 4. is in perspective

view shows the inverter.

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 shows a panel loudspeaker 81 of the type described and claimed in our co-pending International Application No. WO97 / 09842, from the same date, which is provided with a rectangular support frame 1 surrounding its inner periphery with a flexible frame 3 supporting the unfolded the sound transducer panel 2. The transducer 9 shown in FIG. 4 is mounted fully and exclusively on this or this panel 2, at a predetermined location defined by the x and y coordinates, the position of which is calculated as described in our co-pending international application No. WO97 / 09842 from the same date, to send bending waves to the sound emitting panel, to induce panel resonation, to generate an acoustic output. The transducer 9 is driven by a signal amplifier 10, for example a low frequency amplifier, connected to the transducer 9 by means of conductors 28.

Figures 2a and 2b show typical cross-sections of the loudspeaker 81 of Figure 1. Fig. 2a shows that the support frame 1 surrounding the flexible frame 3 and the panel 2 are connected to each other by respective glued joints 20. Suitable materials for the support frame are lightweight frame structures, for example, picture frames of extruded metal such as aluminum alloys or of plastics. Suitable materials for the flexible frame are resilient materials such as foam rubber and foam plastics. Suitable adhesives for glued joints 20 are epoxy, acrylic and cyanoacrylic adhesives, etc.

In Fig. 2b it is shown on an enlarged scale that the panel 2 is rigid, the light panel consisting of a core 22, for example a rigid plastic foam 97 of cross-linked polyvinyl chloride or a lightweight structure 98, i.e. a honeycomb structure of metal.

foil, plastic or the like, with chambers extending transversely to the plane of the panel 2, the core 22 being closed between opposing cover layers 21, for example of paper, cardboard, plastic or metal foil or sheet. When the cover layers 21 are plastic, they may be reinforced with fibers, for example carbon, glass, Kevlar CRTM) or the like in a manner known per se, of the module.

The envisaged cover materials to increase their layer and reinforcement thus include carbon, glass, Kevlar

CRTM), Nomex (RTM),

i.e.

aramid and similar fibers in different layers and weaves, as well as paper, laminated paper, melamine and a variety of high modulus synthetic plastic films such as Mylar

CRTM), Kaptan CRTM), polycarbonates, phenolic plastics, polyesters or related plastics and fiber reinforced plastics, etc., and metal foils or sheets. Research on the Vectra grade of liquid crystal polymer thermoplastics shows that they may be useful for producing ultra-thin coatings or coatings of smaller dimensions, up to about 30 cm in diameter, in plastic forging technology. This material itself creates an oriented crystalline structure in the injection direction, which is an advantageous orientation for propagating high-frequency energy from the excitation point to the panel perimeter.

The envisaged core layer materials include industrially manufactured honeycomb or corrugated structures of aluminum alloy sheet or foil or Kevlar CRTM),

Nomex

CRTM), uncoated paper or cardboard and various synthetic plastic films, as well as cellular or foamed plastic or fibrous materials, even aerogel metals, provided they have a suitable low density. Some suitable core layer materials effectively exhibit useful self-contracting in their manufacture and / or otherwise have sufficient intrinsic rigidity for use without the need for lamination between layers. The high performance lightweight core material is known under the trade name Rohacel1, which may be suitable as a radiating panel, and which is free of covering layers. Practically speaking, the purpose is an overall light and rigid material suitable for special purposes, in particular including the best possible benefit of the layer to the cores and cover layers and the transition between them.

The resilient frame 3 can damp the edges of the panel 2 to prevent excessive movement of these edges. Further or alternatively, additional damping may be used, for example by means of damping pads glued to the panel at selected locations, to damp excessive movements of the panel to ensure a uniform distribution of resonance across the panel.

The pads may be of a tumor commonly used in a loudspeaker housing, or may be of a resilient or rigid polymeric sheet material.

Some materials, especially paper and board, and some cores may be self-dimming. On request, damping can be increased by the construction of the panel by the use of flexible rather than rigid fixation adhesives.

This effective selective damping involves specifically attaching the damping means to the panel, including its layers, which permanently bond to it. The edges and corners may be particularly important for the predominant and less dispersed types of panel vibration at low frequency. By attaching the damping means to the edges, a panel can be formed whose layers are fully framed, although its corners can often be relatively loose, it can be said for the desired extension in low frequency operation. The connection can be made with adhesive or self-adhesive materials. Other types of useful damping means, particularly with respect to finer effects and / or mid and high frequencies, can be attached to the layers at predetermined intermediate positions in the region in the form of suitable materials.

φφφφ φ φ *

• ♦ φφφφ φφφ φ • ·

The acoustic panel described is two-dimensional.

The sound energy from his rear face is not strongly phased with the energy from his front face. This results in the benefit of the total sum of the sound power in the room, the distribution of sound energy at a uniform frequency, the reduced effects of reflected and standing waves, together with the advantage of excellent reproduction of the natural space and environment of the reproduced sound recording.

Although radiation from the acoustic panel is very non-linear, the percentage of phase information increases off-axis. For enhanced focus on artificial stereo, the position of the announcer, and images, at the usual height of a standing person, the advantage of a slight offset for a normally seated listener contributes to optimizing the stereo effect.

Also, the triangular left / right geometry with respect to the listener creates an additional angular component. Thus good stereo reception is achievable.

compared to the reproduction of a conventional loudspeaker, there is another advantage for one group of listeners. The intrinsically dispersed nature of the sound emission of the acoustic panel gives it a sound volume that does not follow the law of indirect dependence on the square of the distance for the equivalent point source.

Since the intensity of decreasing distance is much lower than the law of indirect dependence on the square of distance, then, as a consequence, for off-center or poorly positioned listeners, the magnetic field strength of the panel speaker increases the stereo effect. compared to conventional speakers. This is because an off-center listener does not suffer from the double problem caused by the proximity of the proximal speaker, first by increasing the volume from the proximal speaker excessively and then lowering the volume from the proximal speaker accordingly.

Another advantage of the flat light panel speaker is that it is visually attractive, has good sound quality, and • ♦ · · · ·

9 requires only the transducer and not the speaker crossover for the full range of sound from each panel membrane.

Referring to Fig. 3, a greeting card or similar card (144) with a built-in loudspeaker 81 of Fig. 1 is shown. The card has the shape of a folded member having a front sheet 145 and a back sheet 146. At least the back sheet 146 is made of laminated cardboard consisting a sandwich-shaped foam plastic core 22 arranged between two cardboard cover layers 21 to form a rigid lightweight unfolded acoustic radiator panel 2 of the type described in Fig. 1a. Such laminated cardboard is known as KAPPABCJARD. It has been found that a panel shaped according to the European Standard 'A' · series is suitable.

The transducer 9 shown in FIG. is attached to the backsheet 146 to cause panel 2 to vibrate, to generate its resonance, to produce an acoustic output. The transducer 9 is powered by a battery generator 112 with a generator or amplifier, the battery unit 112 being controlled by a greeting card switch so that it activates the signal generator when the greeting card is opened.

It should be noted that no support frame or resilient frame 3 is required in this arrangement. Sufficient attenuation of the greeting card is provided by the material from which the greeting card is made.

or by holding the ticket or placing it on an area.

Fig. 4 shows an inverter 9 for an exploded panel 2 in the form of a crystalline bending piezoelectric member 27 attached to a disc 118, for example of brass, which is attached to the face of the panel 2, for example by means of an adhesive joint

20. The acoustic signal applied to the transducer 9 by means of conductors 28 during operation causes the piezoelectric member 27 to bend, thereby causing local elastic deformation of the panel 2 to transmit bending waves to the panel 2.

? V • · · · · ·

Claims (4)

PATENTOVÉ Claims A congratulatory card or similar card (144) at least one sheet (145, 146), characterized in that it comprises a loudspeaker consisting of a sheet of said card, wherein the carton having the carton is formed by a member (2) having the ability to maintain and propagate the input vibration energy by bending waves in at least one operating region extending transversely to its thickness, with resonant mode vibration components distributed at least in this region, and with predetermined preferred locations in that region for positioning the transducer, the transducer <9 ) is mounted fully and exclusively on this member at one of these vibration inducing locations of the member to generate its resonance, forming an acoustic radiating panel (2), producing an acoustic output during resonation. 2. A congratulatory card according to claim 1, characterized in that the radiating panel (2) is provided with a lightweight core (22) sandwiched between two cover layers (21). Congratulatory card, according to claim 1 or 2, characterized in that the radiating panel (2) is provided with a foam plastic core (22) (97) arranged with a sandwich between two cardboard cover layers (21). 4. Congratulatory ticket, according to of claims 1 to 3, mark ící se by that currencies i <9) is formed Ρ i ezoe1ectric bending member. 5. Congratulatory ticket, according to Claim 4 in y z n and no u s e characterized in that the piezoelectric element (9) is crystalline. • · · · · · · · · · · · · · · · · 6. Congratulatory card, according to claims 1 to 5, list (145, 146) and control for actuating the control therewith. the means of the transducer (9) being connected (53) associated with these relative movements of one sheet versus the other. A congratulatory card, according to claim 6, it is provided with a signal generator, an amplifier with e by and the inverter's electrical link. (112) on one Sheet k power supply 8. Congratulation Card, characterized according to s e claims 1 to that 7, panel (2) Yippee adapted for printing.