CN1054490C - Loudspeaker device and television receiver using device - Google Patents
Loudspeaker device and television receiver using device Download PDFInfo
- Publication number
- CN1054490C CN1054490C CN96106629A CN96106629A CN1054490C CN 1054490 C CN1054490 C CN 1054490C CN 96106629 A CN96106629 A CN 96106629A CN 96106629 A CN96106629 A CN 96106629A CN 1054490 C CN1054490 C CN 1054490C
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- Prior art keywords
- loud speaker
- sound pipe
- sound
- speaker
- blind end
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- Expired - Fee Related
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- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
Abstract
A loudspeaker device comprises a loudspeaker (3) and a sound tube (4) having an open end and a closed end opposite thereto and connected to a sound wave radiating portion of the speaker (3) for guiding sound waves radiated from the speaker (3) to the open end of the sound tube (4), the speaker (3) being attached to a side wall of the sound tube (4), the sound tube (4) having a wave guide direction intersecting the direction of radiation of sound waves from the speaker (3), the speaker (3) being attached to the sound tube (4) at a position intermediate between the closed end and the open end. This construction effectively suppresses occurrence of standing waves, realizing satisfactory acoustic characteristics over a wide range of low to high frequencies.
Description
The speaker unit of the sound pipe that the present invention relates to comprise loud speaker and link with it also relates to the television receiver with this device.
European patent application EP 451885A1 discloses a kind of Voice ﹠ Video device with compact conformation of boombox.This device comprises a shell, a loud speaker and an audio channel.This loud speaker and this passage are with the audio system Collaboration.One end of this passage is an opening for an aperture that is positioned within this device.For reproducing audio signal effectively, length should be more than or equal to half of the length of this passage longitudinally along passage for loud speaker, and loud speaker is arranged in this passage.But this document is not described loud speaker and whether is arranged on the anti-node location of standing wave so that the appearance of standing wave effectively
See Figure 22, television receiver comprises the cathode ray tube 11 that is configured in the casing 1 and is configured in the left and right a pair of loud speaker 12 in the dead angle of cathode ray tube 11 in the casing 1.Each loud speaker 12 emitting sound wave is all led the front side of casing 1 through the sound pipe 13 that links with it.
In recent years along with the increase of television receiver size, the size of used loud speaker is also increasing.When large diameter loud speaker 12 was resembled the CRT11 of being contained in shown in Figure 22 both sides, loud speaker 12 can not be contained in the dead angle in the above-mentioned casing 1 fully, thereby need make the sidewall of casing 1 protrude out.This will make the transverse width of casing 1 increase.
Therefore, need resemble shown in Figure 23ly loud speaker 12 to be tilted a little with respect to the front side and sound pipe 14 is installed on each loud speaker 12 sidewards.
Like this, loud speaker 12 can be contained in the dead angle of casing 1 in the compact structure mode.
But loud speaker as shown in figure 23 is owing to its sound wave is to import sound pipe 14 with the wide-angle deflections near 90 degree, thereby can produce the infringement acoustic wave character problem of the acoustic wave character of intermediate frequency particularly.
Any speaker unit shown in Figure 22 and 23, the sound wave of emitting and importing sound pipe 13 or 14 from loud speaker 12 is to emit from the openend of sound pipe.At this moment, because the obvious change of the sound impedance on openend, some ripple can reflect back into loud speaker 12 to produce standing wave.
For example, when 3/4 quilt length of standing wave equals sound pipe length, resonance can occur, near 700Hz-1kHz, obvious peak value appears in acoustic pressure-frequency characteristic, and this will damage near the particularly acoustic wave character intermediate frequency.
In order to eliminate the interference of the acoustic pressure-frequency characteristic that causes owing to standing wave, in the sound pipe of loud speaker, around the audible segment of loud speaker, add sound-absorbing material, absorb standing wave (the Japan Patent of Shening does not disclose flat 5-168082) with this.But, owing to, just can not hit on absorbing material, thereby can not absorb standing wave effectively to the reflection in a single day of the positive sound wave of propagating of loud speaker.
The object of the present invention is to provide a kind of speaker unit, wherein the guided wave direction of sound pipe and the voice directions of loud speaker tilt, and adopt the effective standing wave means that absorb to obtain gratifying acoustic wave character in the scope from the low frequency to the high frequency.
The invention provides a kind of speaker unit, comprise loud speaker (3) and sound pipe (4), this sound pipe (4) has an openend and the blind end relative with it, and be connected to the audible segment of loud speaker (3), be used for the acoustic duct of loud speaker (3) openend to sound pipe (4), loud speaker (3) is attached on the sidewall of sound pipe (4), sound pipe (4) has and the crossing guided wave direction of the direction of the sound wave that sends from loud speaker (3), loud speaker (3) is attached on the sound pipe (4) at place, the centre position between blind end and the openend, the position of adhering to is facing to the position of the antinode of the standing wave that occurs in the sound pipe (4), and sound pipe (4) wall within it has a round truncated cone shape projection (6) towards loud speaker (3) projection, and relative with audible segment.
The standing wave that occurs in sound pipe has a nodal point at its blind end, has an antinodal point at its openend, and one or more antinodal points are also arranged between blind end and openend, to produce resonance.Therefore, adopt traditional loud speaker to be attached to the device of sound pipe blind end, attachment position is relative with the position of the nodal point of standing wave, then makes the most of contribution of actuating force of loud speaker give standing wave, thereby bigger standing wave can occur.
The aspect adopts speaker unit of the present invention in addition, and its loud speaker 3 is to be attached on this sound pipe 4 on the position intermediate between the blind end of sound pipe 4 and the openend, and the position of attaching is facing to the position of an antinode of standing wave.This will reduce the driving efficient of loud speaker to standing wave, the result has suppressed standing wave, and improve particularly the acoustic wave character at intermediate frequency.
Specifically, loud speaker 3 is attached on the sound pipe 4 at about 1/3 place of sound pipe total length counting from blind end away from blind end towards openend.The anti-node location of standing wave also herein.In concrete device, loud speaker 3 is attached to facing on the position of 3/4 wavelength standing wave antinode, thereby has suppressed the resonance of 3/4 wavelength standing wave effectively.
In concrete device for carrying out said, in sound pipe 4, on than the interior location of loud speaker 3 more close blind ends, install sound-absorbing material 5.With this concrete structure, in a single day knock sound-absorbing material 5 from whole ripples of the opening of sound pipe 4 reflection after, just be absorbed.
Be described in further detail, the cross section of the waveguiding channel of sound pipe 4 from loud speaker 3 appended positions to openend is about constant or increase, and reduces to the cross section of blind end from loud speaker 3 appended positions.In this ad hoc structure, the section size that the section size of sound pipe openend of reflected wave and the final sound pipe blind end that arrives of reflected wave occur is different, thereby at the ripple of asymmetric ground of blind end reflection attenuation.
In another concrete structure, in sound pipe 4 than cremasteric reflex device 7 in the position of the more close blind end in position of loud speaker 3 attachings, to separate waveguiding channel on its ground, top, position.Acoustic wave character when this concrete structure has improved high frequency effectively realizes well balanced acoustic wave character at middle tremendously high frequency.
In addition, the terminal 32 that electric current is fed loud speaker 3 is being supported on the position of the openend of sound pipe 4 away from the center of loud speaker 3 on the frame 30, and twisted wire 33 reaches on the cone 31 from each terminal 32.In this ad hoc structure, the imbalance of the acoustic pressure impedance of the cone 31 of relative loud speaker 3, promptly be higher than acoustic pressure impedance at openend in the acoustic pressure impedance of blind end, be to cause by the equivalent material that is increased, the i.e. weight of 31 twisted wire 33 and lead-in wire from terminal 32 to cone, and be used for twisted wire 33 is fixed to that the weight of the solder flux on the lead-in wire causes.As a result, cone 31 only vibrates along the voice directions one dimension, thereby obtains distortionless high-grade tonequality.
The invention provides a kind of television receiver that in casing (1), comprises cathode ray tube (11) and a pair of speaker unit (2) in the cathode ray tube both sides, each speaker unit (2) is included in the loud speaker of laterally placing in the casing (1) (3), and be connected on the audible segment of loud speaker (3) and from the inner blind end of casing (1) to the sound pipe (4) that extends the openend of casing (1) front side, loud speaker (3) is attached on the sidewall of sound pipe (4), sound pipe (4) has the crossing guided wave direction of sending with loud speaker (3) of audio direction, loud speaker (3) is being attached on the centre position between blind end and the openend on the sound pipe (4), the position of adhering to is facing to the position of the antinode of the standing wave that occurs in the sound pipe (4), and sound pipe (4) wall within it has a round truncated cone shape projection (6) towards loud speaker (3) projection, and relative with audible segment.
Television receiver of the present invention is equipped with a pair of speaker unit 2 in the CRT11 both sides in casing 1, loud speaker 3 laterally is being placed in the casing 1 away from casing 1 front end, like this, even have the loud speaker 3 of the bore of increase all can be assemblied in the dead angle compactly, thereby no longer need the casing 1 of big transverse width.In addition, because the loud speaker of each speaker unit 2 is being attached on the sound pipe 4 on the centre position between blind end and the openend, thereby standing wave is suppressed effectively.
The guided wave direction of sound pipe will cause to be the problem that the peak value drop range appears in the center with the intermediate frequency with respect to the inclination of the direction of the sound wave that sends from loud speaker, and after adopting the present invention, this peak value drop range is suppressed effectively, thereby obtains gratifying acoustic wave character in the wide region from the low frequency to the high frequency.
Fig. 1 is the fragmentary, perspective view according to television receiver of the present invention;
Fig. 2 is the schematic diagram of speaker unit of the present invention;
Fig. 3 is the profile of speaker unit;
Fig. 4 is the schematic diagram that the speaker unit partition is come;
Fig. 5 is the schematic diagram of partition that comprises the speaker unit of reflector;
Fig. 6 is the fragmentary, perspective view of speaker unit;
Fig. 7 is the fragmentary, perspective view of the speaker unit of termination on the another location;
Fig. 8 is the cutaway view of speaker unit;
Fig. 9 is the perspective view of experiment speaker unit;
Figure 10 is the profile of speaker unit;
Figure 11 is the schematic diagram of different modes of resonance;
Figure 12 is the figure table, and the acoustic pressure-frequency characteristic when the blind end of sound pipe is activated is shown;
Figure 13 is a schematic diagram, and two kinds of experimental speaker units are shown, and the accompanying position of its loud speaker has nothing in common with each other;
Figure 14 is the figure table, and the acoustic pressure-frequency characteristic of one of speaker unit is shown, and wherein loud speaker is to be contained in to start at 1/2 distance from blind end;
Figure 15 is the figure table, and the acoustic pressure-frequency characteristic of another device is shown, and wherein loud speaker is to be contained in to start at 1/3 distance from blind end;
Figure 16 is a schematic diagram, and the speaker unit of the experiment that is packaged with sound-absorbing material is shown;
Figure 17 is the figure table, and the acoustic pressure-frequency characteristic of this speaker unit is shown;
Figure 18 is a schematic diagram, and the experimental speaker unit with projection relative with loud speaker is shown;
Figure 19 is the figure table, and the acoustic pressure-frequency characteristic of this speaker unit is shown;
Figure 20 illustrates the experimental speaker unit with reflector;
Figure 21 is the figure table, and the acoustic pressure-frequency characteristic of speaker unit is shown;
Figure 22 is a plane graph, and the speaker unit that is contained in the traditional tv receiver is shown;
Figure 23 is a plane graph, and another traditional example is shown.
Consult accompanying drawing below and describe several embodiments of the invention.
The speaker unit of the present invention 2 that Fig. 1 illustrates television receiver of the present invention and adopted.Be placed on the both sides of CRT11 in the casing 1 respectively at a pair of loud speaker 2 of both sides.
Each speaker unit 2 is included in the dead angle of casing 1 in the loud speaker 3 of traverse of casing 1 inside away from the casing front side, and has blind end in casing 1 inside part, has the sound pipe 4 of openend in the front side of casing 1.The front side of loud speaker 3 is attached on the sidewall of sound pipe 4, and loud speaker 3 is a common awl moving-coil speaker shown in Figure 2, and has cone 31, is supported by the damping device on the framework 30.Cone 31 is by being driven through the electric current that passes through that flows through loud speaker of terminal to 32,32 inputs.
See Fig. 2, loud speaker 3 is leaving blind end and is being attached on the sound pipe 4 at 1/3 length place of the whole sound pipe 4 of distance openend.Sound pipe 4 comprises first panel 41 and second panel 42 that combines, and both define from the position of loud speaker 3 jointly to the forward direction waveguiding channel 43 of openend, and back to waveguiding channel 44 from the position of loud speaker 3 to blind end.
As shown in Figure 4, the width of the passage 43 of sound pipe 4 is gradually wide towards the direction of openend in a predetermined manner, and meanwhile, the thickness of its wall becomes reciprocally to reduce towards openend, the result, and the section of the part from loud speaker 3 to openend remains unchanged.So the openend of sound pipe 4 has a rectangular aperture that vertical direction is elongated in the front side of casing 1.This horizontal reductions that makes casing 1 is to minimum.
On the contrary, passage 44 is gradually little towards its cross section of blind end direction.Sound-absorbing material 5 is equipped with at the rear portion of passage 44.On the position that loud speaker 3 will be attached to pipe 4 on first panel 41, form the hole, garden 45 that will enter sound pipe 4 by the sound wave that it sends loud speaker 3.It is relative and to frusto-conical protrusion 6 loud speaker 3 projectioies and shape unanimity cone 31 that second panel 42 has circular hole 45 with first panel 41.
Fig. 5 and 6 illustrates a kind of speaker unit, and it has a pair of apart back reflector 7,7 to waveguiding channel 44 porch of driving and be contained in sound pipe 4.Passage 44 is equipped with sound-absorbing material 5 similarly after reflector 7,7.
Fig. 7 and 8 illustrates a kind of speaker unit, and wherein the terminal 32,32 of loud speaker 3 is supported on the frame 30 away from the center of loud speaker 3 on the position of sound pipe 4 openends.Twisted wire 33 extends on the cone 31 from terminal 32.
Experimental speaker unit shown in Fig. 9 and 10 is the advantage that is used for confirming by experiment above-mentioned speaker unit, and Figure 11 illustrates result of experiment to Figure 21.
As shown in Figures 9 and 10, experimental speaker unit has one at the constant experimental sound pipe 8 of the whole length upper section of its waveguiding channel, and is attached to the loud speaker 3 on pipe 8 sidewalls, and this speaker unit is structurally basic identical with speaker unit of the present invention.Microphone 9 being housed, be used for determining acoustic pressure-frequency characteristic with pipe 8 openend opposite positions.
Pipe 8 long 350mm, the actual measurement square-section is 105mm * 50mm.Microphone 9 and the openend of pipe 8 10mm of being separated by.
Figure 11 is illustrated in the standing wave in the sound pipe of constant cross-section.
Suppose the long L of being of sound pipe, the frequency F that standing wave occurs provides as follows by equation 1:
Equation 1:
F＝(C/4L)×(2n+1)
Wherein C is the velocity of sound, n be integer (0,1,2 ...).
Suppose L=0.35mm, C=340m/s.Frequency F1 when 1/4 wavelength standing wave, 3/4 wavelength standing wave, 5/4 wavelength standing wave occurring, F2 and F3 are as follows respectively:
F
1＝243Hz
F
2＝729Hz
F
3＝1214Hz
When the blind end of sound pipe is subjected to loud speaker with the driving of frequency characteristic shown in dotted lines in Figure 12, then the frequency characteristic of the sound wave of emitting from sound pipe tremendously high frequency occur by figure in the liter of the tangible repeatability represented of solid line fall, and thereby scratched characteristic random.Correspondingly, calculate the frequency characteristic at solid line place by computer simulation.
On the other hand, by obtaining the frequency characteristic shown in Figure 15 and 14 in the experimental result that A type device is carried out, as Figure 13 the loud speaker of A type device wherein being shown respectively is to be contained in from blind end to start at whole long 1/3 position, the loud speaker of Type B device be contained in start at from blind end whole long by 1/2.
Specifically, with the wherein loud speaker of Type B is to be contained in 1/2 the place and by the device shown in the solid line of Figure 14, its indicatrix is different from when blind end is driven (dotted line) and locates more smooth a little situation at a near frequency band (1KHz), but big drop range is arranged near 300Hz, and show that acoustic pressure reduces near 1500Hz.
In addition, with the device that loud speaker is also represented with the solid line of Figure 15 at 1/3 place, the peak value drop range is suppressed fully at middle tremendously high frequency place, and drop range disappears near 300Hz, at 1000Hz-1800Hz sufficiently high sound pressure level is arranged, thereby has satisfied acoustic pressure-frequency characteristic.
This advantage is that to be obtained from 1/3 position be corresponding with the antinode of 3/4 wavelength standing wave (being the frequency place of 729Hz in this experiment).The position of driving antinode can reduce the driving efficient when having standing wave to occur, thereby suppresses the appearance of standing wave.
The experimental result of Figure 15 is further illustrated in the peak value that intermediate frequency (about 729Hz) locates and obviously slackens, thereby has proved the advantage of speaker unit of the present invention.
Figure 16 illustrates D type experiment speaker unit, wherein at the rear portion of sound pipe sound-absorbing material is housed.Figure 17 illustrates the frequency characteristic that is determined by this device.
Shown in the solid line of Figure 17, the peak value drop range at middle tremendously high frequency place is subjected to effective inhibition.This is because bump against sound-absorbing material at the sound pipe opening part through reflected sound wave, and has no to be absorbed by sound-absorbing material with leaking, thereby has suppressed the cause of the resonance of standing wave.
Figure 18 illustrates E type speaker unit, wherein sound pipe have relative with loud speaker and with the projection of the shape unanimity of cone.Figure 19 illustrates its frequency characteristic.
Shown in Figure 19 realized, this device presented the acoustic pressure that is higher than D type speaker unit acoustic pressure (dotted line) in the 800Hz-2500Hz scope.This be because, the sound wave guiding of sending in the diffuser with D type device enters the position of sound pipe, waveguiding channel has the part of a rapid expansion that is limited by recessed cone shape, adopt E type device, cross section in the waveguiding channel of loud speaker porch changes it by a projection also is provided equably, thereby the cross section of sound pipe can sharply not changed, and guaranteeing that from loud speaker acoustic resistance evenly changes when sound pipe is sent sound wave.
Figure 20 illustrates F type speaker unit, and there is a pair of reflector in the place ahead of its sound-absorbing material in sound pipe.Figure 21 illustrates its frequency characteristic.
Shown in the solid line of Figure 21, the drop range in the 6000Hz-7000Hz scope is less than the situation (dotted line) in the E type device.This shows that acoustic pressure can be regulated by reflector in high-frequency range.
According to the present invention, loud speaker 3 can be attached on the sound pipe 4 at the place, centre, be preferably in the corresponding position, position of the 1/5-3/5 of counting from blind end in whole length and be attached on the sound pipe 4, preferably be attached on the sound pipe 4 at 1/3 place, thereby as mentioned above, can reduce the peak value drop range that in the acoustic pressure-frequency characteristic of speaker unit, occurs effectively.In addition, when packing sound-absorbing material 5 in the sound pipe into,, improve the frequency characteristic in middle tremendously high frequency scope to form projection 6 and cremasteric reflex device 7.
In addition, the terminal 32 of loud speaker 3 is moved on to openend from managing 4 blind ends, when cone 31 vibrations, can eliminate the imbalance of impedance that will burden, thereby glitch-free high-grade tonequality is provided.
Because the constant cross section of the forward direction waveguiding channel 43 of sound pipe 4 on the direction of extending forward, then constant to the sound impedance of openend from the position that loud speaker 3 adheres to, and make the ripple of the unlikely appearance reflection in the middle part of passage 43 and make it form so-called Helmholtz resonator.
In television receiver of the present invention, a pair of discrete loud speaker can be contained in the casing 1 compactly, effectively utilizes the dead angle that produces in the both sides of CRT11.Thereby can use the bigger loud speaker of diameter.
The present invention also should not be limited to foregoing description, for example, pipe 4 passage 43 can be designed among the embodiment like that, also can be the shape that flaring is opened, thereby obtain the effect of loudspeaker.
Though the essential characteristic of device of the present invention is a loud speaker 3 is contained in pipe 4 middle part, supplementary features be sound-absorbing material 5 be housed in the device, form projection 6, cremasteric reflex device and the position that changes loudspeaker terminal 32.But, the device of these all supplementary features can be fully need not, also can preferably select a certain or certain is several.
Claims (9)
1. speaker unit, it is characterized in that, comprise loud speaker (3) and sound pipe (4), this sound pipe (4) has an openend and the blind end relative with it, and be connected to the audible segment of loud speaker (3), be used for the acoustic duct of loud speaker (3) openend to sound pipe (4), loud speaker (3) is attached on the sidewall of sound pipe (4), sound pipe (4) has and the crossing guided wave direction of the direction of the sound wave that sends from loud speaker (3), loud speaker (3) is attached on the sound pipe (4) at place, the centre position between blind end and the openend, the position of adhering to is facing to the position of the antinode of the standing wave that occurs in the sound pipe (4), and sound pipe (4) wall within it has a round truncated cone shape projection (6) towards loud speaker (3) projection, and relative with audible segment.
2. speaker unit according to claim 1, it is characterized in that, the waveguiding channel of sound pipe (4) extends to openend from blind end, and have one and extend to the back of blind end to the guided wave channel part, and be placed on the position relative with the audible segment of loud speaker (3) to the sealing of center waveguiding channel part distolateral between.
3. speaker unit according to claim 1 is characterized in that, loud speaker (3) is to count from blind end away from blind end towards openend, be attached on the sound pipe (4) on the position of the about 1/5-3/5 of sound pipe (4) total length.
4. speaker unit according to claim 3 is characterized in that, loud speaker (3) is to count from blind end away from blind end towards openend, be attached on the sound pipe (4) on the position of sound pipe (4) total length about 1/3.
5. speaker unit according to claim 1 is characterized in that, sound-absorbing material (5) is loaded onto in the place of the more close blind end in position that adheres at sound pipe (4) internal ratio loud speaker (3).
6. speaker unit according to claim 1 is characterized in that, sound pipe (4) have approximate with constant or from position that loud speaker (3) adheres to the waveguiding channel of the cross section increase of openend.
7. speaker unit according to claim 1 is characterized in that, sound pipe (4) has the waveguiding channel that reduces to its cross section of blind end from the position that loud speaker (3) adheres to.
8. speaker unit according to claim 1 is characterized in that, sound pipe (4) provides a reflector (7) in inside than the ad-hoc location of the more close blind end in the appended position of loud speaker (3), to have separated waveguiding channel on ground, certain location top.
9. television receiver that in casing (1), comprises cathode ray tube (11) and a pair of speaker unit (2) in the cathode ray tube both sides, each speaker unit (2) is included in the loud speaker of laterally placing in the casing (1) (3), and be connected on the audible segment of loud speaker (3) and from the inner blind end of casing (1) to the sound pipe (4) that extends the openend of casing (1) front side, loud speaker (3) is attached on the sidewall of sound pipe (4), sound pipe (4) has the crossing guided wave direction of sending with loud speaker (3) of audio direction, loud speaker (3) is being attached on the centre position between blind end and the openend on the sound pipe (4), the position of adhering to is facing to the position of the antinode of the standing wave that occurs in the sound pipe (4), and sound pipe (4) wall within it has a round truncated cone shape projection (6) towards loud speaker (3) projection, and relative with audible segment.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15256095A JP3171542B2 (en) | 1995-05-26 | 1995-05-26 | Loudspeaker device and television receiver using the same |
| JP152560/95 | 1995-05-26 | ||
| JP152560/1995 | 1995-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1140970A CN1140970A (en) | 1997-01-22 |
| CN1054490C true CN1054490C (en) | 2000-07-12 |
Family
ID=15543152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96106629A Expired - Fee Related CN1054490C (en) | 1995-05-26 | 1996-05-25 | Loudspeaker device and television receiver using device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0744880A1 (en) |
| JP (1) | JP3171542B2 (en) |
| KR (1) | KR100221987B1 (en) |
| CN (1) | CN1054490C (en) |
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| KR102221476B1 (en) * | 2017-04-21 | 2021-03-04 | 제네렉 오이 | Directional multiway loudspeaker with waveguide |
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| EP0605224A1 (en) * | 1992-12-25 | 1994-07-06 | Kabushiki Kaisha Toshiba | Television set speaker system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB735402A (en) * | 1953-07-23 | 1955-08-17 | Gen Electric Co Ltd | Improvements in or relating to television receivers |
| US3993162A (en) * | 1975-06-20 | 1976-11-23 | Kenneth Juuti | Acoustic speaker system |
| JP2783839B2 (en) * | 1989-03-29 | 1998-08-06 | 三洋電機株式会社 | Speaker device |
-
1995
- 1995-05-26 JP JP15256095A patent/JP3171542B2/en not_active Expired - Fee Related
-
1996
- 1996-05-23 EP EP96108264A patent/EP0744880A1/en not_active Withdrawn
- 1996-05-25 CN CN96106629A patent/CN1054490C/en not_active Expired - Fee Related
- 1996-05-25 KR KR1019960017884A patent/KR100221987B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0451885A1 (en) * | 1990-03-13 | 1991-10-16 | Koninklijke Philips Electronics N.V. | Audio or video apparatus with in-built loud-speaker |
| EP0451991A2 (en) * | 1990-03-30 | 1991-10-16 | Matsushita Electric Industrial Co., Ltd. | Speaker system and TV with the same |
| WO1991019406A1 (en) * | 1990-05-25 | 1991-12-12 | Mitsubishi Denki Kabushiki Kaisha | Speaker system |
| EP0605224A1 (en) * | 1992-12-25 | 1994-07-06 | Kabushiki Kaisha Toshiba | Television set speaker system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1140970A (en) | 1997-01-22 |
| JPH08331685A (en) | 1996-12-13 |
| KR100221987B1 (en) | 1999-09-15 |
| EP0744880A1 (en) | 1996-11-27 |
| KR960043966A (en) | 1996-12-23 |
| JP3171542B2 (en) | 2001-05-28 |
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