FI20187175A1 - Combination of a passive and electroacoustic oscillator in a thin planar loudspeaker cabinet arrangement - Google Patents

Abstract

A combination of a passive (P) and an electroacoustic (EA) oscillator in a thin planar speaker housing arrangement (1), in particular in a personal radio transceiver, and a media player comprising a bass sound resonant thin housing (1) formed of at least two adjacent main planes (1) and a housing (1) from the closed sides, each housing (1) comprises at least one resonator chamber (CHAMBER) formed by a wall (5) between the planes (7), a chamber (CHAMBER) of the sound outlet (6.1) leading to a sound-like resonant tube (6) forming a Helmholtz resonator an electroacoustic oscillator (EA) which generates bass sound into a chamber (CHAMBER), in which at least passive (P) oscillators are connected to the above-mentioned levels (7) at the chamber as they resonate from the sound opening (2) of the housing (3) of the device (10) ) out, preventing the housing (1) from vibrating.

Description

1. A combination of passive and electroacoustic oscillator in a thin planar speaker enclosure arrangement. In particular, the present invention is directed to a combination of a personal radio transceiver and a speaker enclosure arrangement according to the preamble of claim 1. The term “personal radio transceiver” means a portable thin planar radio transmitter and receiver equipment, such as a mobile or computer telephone, a tablet computer with at least one antenna, an electronic arrangement with power supplies for media playback, and an amplifier for using a speaker element to generate sound from various devices; , for example, an accessory to be connected to a computer telephone and a thin-sized device for playing media conforming to the above-mentioned devices.

It is already known that thin case arrangements for reproducing bass sound suitable for a small portable device have been developed. The housing is small with respect to the wavelength of the lower limit frequency reproduced by the device and comprises = 25 primarily two independent planes between which there is a wall arrangement following their = inner surfaces. The device has a space 5 for the loudspeaker at the resonance chamber, and a tubular air pressure line a with a tubular cross-section twisting out of the chamber 2, the tubular air column formed by which acts as an acoustic counterweight to the chamber R 30, whereby the loudspeaker resonates 5 bass sounds. The Helmholtz resonator Q, which is open at one end, also generates bass sound from the open end of the tube. The chamber thus has an opening into the labyrinth and there is an opening out of the labyrinth or its other end is closed. Labyrinth resonator tube

2. the typical length is about 1/8-0 of the calculated wavelength of the resonant frequency used if one end is open. Similarly, if the end of the resonator tube is closed, its length is about 1/16 to 0 of the calculated wavelength of the resonant frequency used. The prior art inventions described in this document are described in Finnish patent applications number FI20160179, FI20167016 and FI20177086 which are / will be disclosed. Other public documents include KR101815062, US2016373854, US2018077486 and CN104737556, which describe the action resulting from the interaction of a passive and an electroacoustic vibrator. KR101815062 describes how a very small speaker housing comprises one passive and electroacoustic oscillator and a reflex port whereby the housing is not hermetically sealed.

Still other publications describe a combination of a hermetically sealed housing and at least two passive oscillators in which the number and location of the oscillators in different ways cancel out the mechanical kinetic energy applied to their housing that would otherwise cause vibration in the housing structure. This mechanical vibration is not an acceptable phenomenon in computer telephones, for example. The operation of the electroacoustic and passive oscillator is somewhat known in a housing which does not have an inner wall or a wall between planes further formed by walls.

The object of the invention is to provide a simple a loudspeaker housing arrangement in which the efficiency of the bass output feature 5 is improved without harmful mechanical vibration 7 of the housing. The case works and is dimensioned, its operating principle and size are suitable for S 30 computer phones, tablets, and other thin media © display devices, for example. According to the invention, the efficiency of bass reproduction in the housing is increased by at least two passive oscillators. Their kinetic energy is generated by an electroacoustic vibrator that is acoustically

3. connected to passive oscillators as described later.

The kinetic energy of the passive oscillators is directed so that they do not cause harmful mechanical vibration to the speaker enclosure.

Vibrating motion cannot be considered acceptable in computer telephones, for example, as it would mechanically strain an otherwise sensitive device.

The speaker housing that can be formed for these devices is typically so small that the volume of the housing alone is not sufficient to tune it to resonate at low frequencies in the range of less than 150 Hz.

In this case, an arrangement such as a Helmholtz resonator can be used in its simplest form, in which the characteristic feature is that it preferably comprises a chamber and a long resonator tube connected to it, the other end of which is acoustically open or closed.

Depending on the length of the tube, it must also be bent parallel to the main plane in order for the housing to fit in the area of the device or a smaller area.

The labyrinthine tube of the resonator has a maximum length of about 1 / 12-1 / 6-0 part of the wavelength of the resonant frequency and may have a larger volume than the chamber.

The lower limit frequency of the bass is - in practice, a tuning calculated and formed for a sufficient range of 50-70hz has been found.

In practice, the length of such a tube connected to a very small chamber, less than about 12 cubic centimeters, very thin has been found to be about 0.6-1.2 m long, i.e. significantly longer, about 1.5 times the length of = 25 with a Helmholtz resonator without not a passive oscillator. a As the volume of the chamber increases, the labyrinthine resonant piping 5 correspondingly shortens according to the operation of the Helmholtz resonator 2.

This publication focuses on how to design and arrange the resonator tube n 30 — more advantageously according to the invention, and to optimize the number and location of passive oscillators to amplify the bass sound N and reduce this arrangement to a smaller size if necessary without raising the lower limit frequency.

It is preferred to use the internal housing arrangement of the device

4. so that it is typically located in its own space at the level of the electronic equipment of the device and that it resonates in the above-mentioned frequency range. On closer inspection, the previously known theories about the transmission line and its length are not suitable for the practical implementation presented here. For example, the length of a transmission line in the 40hz frequency range in such speakers is typically 4 parts of the wavelength, i.e., more than 2m, being far too long for the invention described herein and its mode of operation.

There are no problems with treble and midrange reproduction in the 150-20000hz frequency range per se. This can be technically accomplished as described herein and in the aforementioned prior publications. Likewise, the above-mentioned playback range is achieved by using a speaker that does not involve any labyrinthine piping.

This is solved according to the invention in this way and the device according to the invention is characterized by the features set forth in the characterizing part of claim 1.

Advantageous developments of the invention are set out in the dependent claims.

The invention will now be described in more detail with reference to the accompanying drawings, in which: Figures 1-4 show some previously known embodiments of a = housing arrangement as drawings. a N 30 Figure 5-8 shows some previously known embodiments of the speaker © as simplified theoretical N observation drawings. Figure 9-36 shows some planar ones according to the invention

5. embodiments of the housing arrangement in the form of simplified plan drawings. Figures 37-40 show details of planar embodiments of a housing arrangement according to the invention.

Figures 41-42 show some details according to the invention in a simplified sectional drawing in a housing arrangement.

Fig. 43 shows some details according to the invention in a simplified sectional drawing of a personal radio transceiver.

Figures 1-4 illustrate the main features of the public inventions at the time of writing this document. In Figure 1, the reference VOL describes a spherical housing, i.e. a chamber, and the number 6 describes a resonant tube in a spherical housing VOL. The arrangement is in principle a hermetically sealed Helmholtz-like resonator in which the tube is about 1 / 16-0 of the wavelength of the lower limit frequency, i.e. about 0.45 m, assuming that the volume of the sphere is small. The electroacoustic speaker EA is positioned to produce sound in the chamber 6 and is dimensioned and designed to operate broadband so that = 25 it also produces bass sound in the housing arrangement described herein, ÖN so that it can be significantly amplified by the resonant tube 6 from the speaker into the enclosure.

7 The spherical housing VOL 6 comprises a first opening 6.1 through which the bass sound formed in the chamber 6 is transmitted to the tube 6. In the tube 6 S 30 the sound wave moves back and forth and the air column inside it counterbalances the movement of the sound & producing part of the electroacoustic vibrator. In Figure 2, the reference VOL describes a spherical housing, i.e. a chamber, and the number 6 describes a resonant tube in a spherical housing VOL. The arrangement is

6. a hermetically open Helmholtz-like resonator in which the tube is about 1 / 8-0 part of the wavelength of the lower limit frequency, i.e. about 0.9 m, assuming that the volume of the sphere is small. The electroacoustic speaker EA is positioned so as to advantageously produce sound in the chamber 6 and is dimensioned and designed to operate in a broadband manner so that it also produces bass sound VOICE in the housing arrangement described herein so that it can be significantly amplified by the resonant tube 6. The resonant tube 6 comprises a first opening 6.1 from which the bass sound formed in the chamber 6 passes to the tube 6 and a sound output opening 6.2, from the end of which the bass sound VOICE passes out. The chamber VOL and the tube 6 are precisely dimensioned together with respect to their volumes and the length of the tube 6 to operate so that the sound travel in the tube 6 is dimensioned so as to achieve adequate bass reproduction. In the tube 6, the sound wave moves back and forth and the air column inside it counterbalances the movement of the sound-producing part of the electroacoustic vibrator. The resonant piping is further described with particular reference, with reference to references FI20160179, FI20167016 and FI20177086, as being transversely, longitudinally or vortex-wound with respect to the housing plane with the end of the resonant tube open or closed. Figure 3 illustrates an apparatus and housing for generating stereo sound. The figures show two independent electroacoustic oscillators EA so that the sound sources EA are on the other side of the housing 1 at its ends. The housing comprises two independent passive oscillators P and a loudspeaker FA which may be located in a space VOL which is large enough in air mass to act as an acoustic counterweight to the loudspeakers FA.

, A wall is placed between the vibrators P over which the sound pressure S 30 passes from the speakers EA. In this case, o passive oscillators are placed in duplicate & on opposite surfaces of the housing in its center. The purpose of the oscillators P is to passively amplify the bass frequencies. It is further known that the area P of the passive oscillators is

7. as a unit approximately equal to the total area of the electroacoustic EA oscillators. Further, the housing 1 comprises an amplifier and a circuit board and a power supply for a BT communication system. Figure 4 also describes a solution in which the housing 1 comprises two opposite passive oscillators P separated from the volume VOL so that their motion deviation is opposite to the solution described in Figure 3.

Figure 5 illustrates a theoretical arrangement according to the invention in which two acoustically independent hermetically sealed spherical chambers CHAMBER P EA are connected to each other via a resonant tube 6. The chamber CHAMBER EA in this case comprises two electroacoustic oscillators EA And the second chamber CHAMBER P in turn two passive opposite oscillators P. When dimensioning the tube, its length would appear to form and settle at about 1/12 of the physical dimension of the resonant frequency, assuming that the spherical chambers less than 12cm? in relation to the tuning frequency 57hz. The air pressure generated by the electroacoustic oscillators EA in the chamber CHAMBER EA travels to the tube 6 and moves to the second chamber CHAMBER P and further moves the passive oscillators P according to their mass N, both simultaneously in opposite directions.

= 25 Ideally, the mass P of the passive oscillators is equal to ÖN and the force N1 N2 cancels each other out, so that they 5 are thus equal. Thus, none of the components P = transmitted k-force N vibrates the housing 1.

a S 30 Figure 6 illustrates a theoretical arrangement © according to the invention in which one N electroacoustic oscillator EA and two passive oscillators P are connected to a hermetically sealed chamber. Furthermore, the chamber comprises a tube 6 closed at one end.

8. settles in about 1/12 of the physical dimension of the resonant frequency, assuming that the CHAMBER EA P volume of the spherical chambers is small, less than 12cm ′ relative to 57hz.

The air pressure generated by the electroacoustic oscillator EA in the chamber further travels to the region of the passive oscillators P and moves the passive oscillators P according to their mass N, both in opposite directions simultaneously.

Ideally, the mass of the passive oscillators is equal and the kinetic forces N1 N2 cancel each other out, thus being equal.

Thus, none of the kinetic forces transmitted from the components vibrates the housing 1. Figure 7 illustrates a theoretical arrangement according to the invention in which one electroacoustic vibrator EA and two passive vibrators P are connected to the chamber CHAMBER.

Further, the chamber comprises an open tube 6 at one end 11 which may be horn-like expanding 11. The length of the tube 6 in this case would appear to be about twice the physical example of the resonant frequency, assuming a small CHAMBER volume of spherical chambers, less than 12 cm '.

The air pressure generated by the electroacoustic EA oscillator in the chamber travels and moves the passive oscillators P according to their mass N 5 25, both simultaneously in opposite directions. —- Further, as the open end 11 of the tube 6 expands in a horn-like manner, the bass sound output can be improved so that the horn 11 = also forms an independent bass sound amplifying device 11. a S 30 Figure 8 illustrates a theoretical arrangement © according to the invention © with three acoustically independent hermetically sealed & spherical chambers is connected to each other via resonant tubes 6.

The chambers CHAMBER FA in this case comprise one electroacoustic FA oscillator each

9. and the third chamber CHAMBER P in turn two passive oscillators P.

When dimensioning the tube, its length L would appear to form and settle in about 1/12 of the physical dimension of the resonant frequency, assuming that the volume of the CHAMBER FA P spherical chambers is small, less than 12cm 'relative to the excitation frequency 57hz.

The air pressure generated by the electroacoustic EA oscillators in the chamber CHAMBFR EA travels to the tube 6 and moves to the second chamber P and further moves the passive oscillators P according to their mass N, both in opposite directions simultaneously.

The area P of the passive oscillators as a unit is about the same as the total area of the electroacoustic EA oscillators, i.e. about twice.

Figures 9-36 illustrate in simplified plan lines the walls 5 between the main planes 7. The construction of the housing 1 according to the invention, in which the theoretical spherical space and the tube 6 are formed into a thin planar housing 1 with at least two very adjacent main planes 7 and sides always at least one wall 5 between the main planes 7 which forms a small opening 6 to connect the acoustically generated spaces FA P.

The aperture 6 and the chamber EA then form an acoustic mechanism similar to a Helmholtz resonator in which the aperture 6 truncates the so-called neck 6 of the resonator which together with the volume formed by the state EA resonates its characteristic 5 bass frequency produced by the electroacoustic oscillator EA. 7 The wall 5 thus separates the chambers, EA P, at their simplest, forming a flat tubular practical resonator S 30, the resonant characteristic frequency of which is amplified by a passive © oscillator P.

The kinetic energy N of the oscillator P is produced by the N electroacoustic oscillator EA.

Reference is made in this connection to Figures 9-16. In the second case, a thin construction of the housing 1 according to the invention is formed by two walls in which

10. the three spherical spaces and the tube 6 are formed into a thin planar housing 1 with at least two main planes 7 and the sides, the resulting space always being divided by at least two walls

5. At its simplest, the wall separates the chamber and the resonant tube, thereby forming a practical resonator whose resonant characteristic frequency is amplified by a passive oscillator P whose kinetic energy N is produced by the electroacoustic oscillator EA. Reference is made in this connection to Figures 17-28. In the third case, one theoretical spherical space and a tube 6 closed at one end are formed into a planar housing 1 with at least two main planes 7 and sides, the resulting space always being shared by at least one wall 5. The wall simply separates the chamber and the resonant tube with a passive oscillator P whose kinetic energy N is produced by the electroacoustic oscillator EA. Reference is made in this connection to Figures 29-32. In the fourth case, the theoretical spherical space and the tube 6 open at one end form a planar housing 1 with at least two main planes 7 and sides, the resulting space being always divided by at least one wall 5. The wall 5 simply separates the chamber and the resonant tube 6 is amplified by a passive oscillator P = 25 whose kinetic energy N is produced by the electroacoustic oscillator EA. ÖN Reference is made in this connection to Figures 33-36. As the wall 5 folds 5 or advances against the side of the housing 1, a tube 6, e.g. drawing 10, is formed when viewed from above 2. Also, a plurality of adjacent walls 5 form a meandering tube 6, e.g. 16. It is thus further possible N to form a double-threaded tube 6, for example drawing 12. It is further possible with the walls 5 to form a housing 1 which the resonant opening 6 opening outwards forms

11. a drawing of a horn 11 with an expanding wall, drawing 35 or a drawing 36 of a classical horn 11 formed with a wall 5 expanding in the plane direction.

Figures 37-40 further illustrate as plan drawings some developments of the housings 1 according to Figures 9-36 and the walls 5 between their main surfaces 7 forming the chamber and the tube 6. A common feature in these four example cases is the advancement of the tube 6 and the formation of the chambers CHAMBER EA P. It is assumed that the passive P and the electroacoustic oscillator EA have the shape of the cross section of the cylinder 14 in their oscillating surfaces. In its simplest form, the chamber CHAMBER P comprises two overlapping passive oscillators P oscillating in opposite directions. The opposite kinetic energy N of the oscillators P does not cause mechanical vibration in the housing 1. Furthermore, the wall arrangement 5 comprises local widenings 12 for adjusting the width and path of the piping 6. The electroacoustic speaker element EA is placed at the CHAMBER EA chamber of the housing 1 in a cylindrical 14 low space. The chambers 14 forming the chambers CHAMBER EA P and its surface area bounded by the second main plane 7 may comprise stiffeners 13. For the stiffeners 13 air pressure is transmitted to the pipe 6 without the surface 7 opposite the cylinder 14 bending from the air pressure generated by the electroacoustic vibrator 5A. In the housing 1 - two interlocking walls 5 are formed. The pipes 6 are 3 connected to each other in the central part of the area of the pipe 6 by the connecting pipe Ir 15. The direction of air pressure in the adjacent pipes 6 is opposite. In this way, a small size of the surface area of the arrangement, low air resistance and efficient propagation can be achieved and the desired resonance can be achieved, for example in the range 50-70 Hz. The characteristic resonance of the housing 1 can be tuned, for example, 57 Hz.

12. Drawing 37 schematically illustrates a simple housing 1 formed from the theoretical arrangement shown in Figure 5 into a substantially thin housing 1. A combination of a resonant tube 6 and a chamber CHAMBER EA comprising rotating walls 5 of the housing 1 in the xy plane which cause air to move helically or in other words vortex, and thus dimensioning the resonant tube 6 to a suitable length. The tubes 6 are arranged to advance so as to connect the first chamber CHAMBER FA to the second chamber CHAMBER P. At least one passive oscillator P is placed in the chamber CHAMBER P.

Fig. 38 illustrates a housing 1 formed from the theoretical arrangement shown in Fig. 6 into a practically thin housing 1. In this case, the shape of the resonant tube 6 is typical and that one end thereof is closed. The tube 6 and the air column contained therein form a counterweight to the chamber CHAMBER and thus form a resonator similar to the Helmholtz resonator. Fig. 39 illustrates a housing 1 formed from the theoretical arrangement shown in Fig. 7 into a practically thin housing 1. In this case, the other end of the resonant tube 6 opens out of the housing 1 as a planar horn 11 formed by a pair of Xy-expanding wall pairs 5. The tube 6 and its air column counterbalance the chamber CHAMBER and thus = 25 form a resonator similar to the Helmholtz resonator where ÖN also the bass sound from the end of the tube is to be amplified.

8 x Fig. 40 illustrates a housing 1 formed from the theoretical arrangement shown in Fig. 8 into a practically thin S 30 housing 1. In this case, the shape of the resonant tube 6 © is typical and that it connects the chamber CHAMBER P to the other chambers & CHAMBER EA. The tubes 6 and the air column contained therein form a counterweight to the chambers CHAMBER EA and thus form a resonator similar to the Helmholtz resonator.

13. Figures 41-42 show a schematic sectional view of two different housings 1 to which an electroacoustic vibrator FA is connected. The section illustrates that the vibrating diaphragm of the speaker may be outside the housing 1. The connection of the loudspeaker can be, for example, lockable or self-adhesive to the structure 7. Furthermore, the attachment of the passive vibrators to the structure 7 can be, for example, glued, self-adhesive or mechanically lockable. For components EA P, the housing 1 may be thinner T1 than for the thicker portion T2, which is typically 4-10mm thick. By this is meant the part of the housing 1 in which the pipes 6 and the walls 5 between them are located. Furthermore, for example, the two housings 1 can be opposed to form practically one housing 1. In the drawing 43, a cross-section of a device 4 with a housing according to the invention is illustrated in a schematic sectional view.

1. In order to emit sound from a closed device 4, an arrangement must be used, the essential feature of which is that all sound resonating from the housing 1 is transmitted to the internal structure 10 of the device 4, from which it is arranged to be output from the housing arrangement 3 through the sound output openings 2. This has been found to be convenient. 2 does not have to be large. Especially in terms of design, this is an advantageous feature in the construction of the device. The housing 1 is preferably inside the device 10 = 25 between the electronic arrangement 10 and the back cover 3 of the device. The device comprises a display 9. 8 x Some housing arrangements according to the invention have been described above. It is clear that the invention is not limited to these examples only, but numerous other embodiments can be formed within the scope of the invention as defined by the claims. The description of the drawings is indicative of the many different possibilities for making the speaker arrangement operate in the bass frequency range.

Claims (1)

14. PATENT CLAIMS: A combination of a passive (P) and an electroacoustic (EA) oscillator in a thin planar loudspeaker housing arrangement (1), in particular a personal radio transceiver such as a portable mobile or computer telephone, a tablet computer and a thin media player according to the above devices, (1) formed by at least two adjacent main planes (7) with the housing (1) acoustically closed at its sides, characterized in that the housing (1) comprises: - At least one resonator chamber (CHAMBER) formed between the planes (7) by their inner surfaces on the wall (5), - from the chamber (CHAMBER) of the sound outlet (6.1), which leads to a state similar to the sound resonant tube (6), forming an arrangement similar to a Helmholtz resonator, - an electroacoustic vibrator (EA) generating bass sound into the chamber (CHAMBER), 00 o 25 to those levels (7) is connected = at least two passive (P) oscillators to the chamber 5 (CHAMBER) as they resonate the bass sound out of the sound opening (2) of the protective housing (3) of the device 7 (10), preventing the housing E (1) and the device (10) from vibrating. S 30 o 2. An arrangement according to claim 1, characterized by N, characterized in that the passive oscillators (P) have the same structure (N) and move in opposite directions. 15. Arrangement according to Claim 1, characterized in that the passive oscillators (P) are arranged opposite the axis of symmetry (8). Arrangement according to Claim 1, characterized in that the chamber is preferably cylindrical in wall (14). Arrangement according to Claim 1, characterized in that the air pressure produced by the electroacoustic (EA) component in the chamber is injected (16) and that the passive oscillators (P) move efficiently in the same chamber. Arrangement according to claim 1, characterized in that the resonant tube (6) of the housing (1) acoustically connects the first chamber (Chamber EA) to the second chamber (Chamber P), tuning the tube (6) and the first chamber (Chamber EA) to resonate at bass frequency so that the air pressure produced by the electroacoustic (EA) component is injected (16) into the second chamber (Chamber P) and that the passive oscillators (P) in the second chamber (Chamber P) move efficiently. An arrangement according to claim 1, characterized in N, characterized in that the resonant tube T (6) of the housing (1) has a length of about 1/12 to 1/6 of the physical = wavelength of the applied & excitation frequency, in the range 50-70hz. tunes the tube (6) and chamber 2 30 (Chamber) to resonate in the bass frequency range. Arrangement according to Claim 1, characterized in that the resonant tube (6) comprises a tube (6) winding in the x-y axis of the plane (7). 16. An arrangement according to claim 1, characterized in that the housing (1) comprises a resonant tube (6) forming a helically tortuous piping (6) in which the direction of sound pressure in the adjacent tubes (7) is parallel and in which the air pressure moves in a vortex. Arrangement according to claim 1, characterized in that the housing (1) comprises a resonant tube (6) which forms a helically tortuous piping (6) in which the direction of sound pressure in the adjacent tubes (6) is opposite and in which the air pressure moves in a vortex. Arrangement according to Claim 10, characterized in that the arrangement comprises a connecting pipe (15) which connects the threaded pipes (6). Arrangement according to Claim 1, characterized in that the resonant tube (6) comprises a tube (6) rounded from its bends. Arrangement according to Claim 1, characterized in that the air column of the resonant tube (6) = 25 forms a resistor for the motion deviation of the electroacoustic (EA) = oscillator. & 14. An arrangement according to claim 1, characterized in that the surface area of the passive oscillators 2 30 (P) is the same as the total area of the electroacoustic (EA). An arrangement according to claim 1, characterized in that the two opposite passive oscillators (P) are in opposite housings (1).