CN1062681C - Display device - Google Patents
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- CN1062681C CN1062681C CN95106514A CN95106514A CN1062681C CN 1062681 C CN1062681 C CN 1062681C CN 95106514 A CN95106514 A CN 95106514A CN 95106514 A CN95106514 A CN 95106514A CN 1062681 C CN1062681 C CN 1062681C
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- Prior art keywords
- bass reflex
- sound
- passage
- sound channel
- bass
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Abstract
To mount speaker device to a television receiver of a short height and to magnify low-frequency sound by reducing the whole height including a sound tube in the speaker device using the sound tube (a sound guide, a sound road). The sound road 2 provided in front of a speaker 3 and a back cabinet 6 provided at the back of the speaker 3 are parted and a part of a baffle 4 fitting the speaker 3 is made oblique so as to provide a bass-reflex port 5 in the middle of this oblique baffle 4a. Making the length L of the bass- reflex port 5 into a proper size and increasing the volume V of a back cabinet 6 by a volume (v) interdependently reduce the frequency of sound resonance and widens a band where the phases of a sound wave discharged from the bass-reflex port 5 and that discharged from the speaker 2 are coincident so as to magnify the low-frequency sound. Reducing the length L of the bass-reflex port 5 to be the proper size can reduce the height (h) of the bass-reflex port 5 and can reduce the whole height H of the speaker device 1 as the result.
Description
The present invention relates to a kind of display device, for example a kind of television receiver, more specifically to a kind of structure of the speaker system with the sound equipment passage, it is placed on a cathode ray tube and is used to encapsulate in the gap between the shell wall of this cathode ray tube.The housing of main element is formed by a front housing (matter shape plate) and a back casing.
Recently, there are many television receivers extensively to adopt large-screen.In this television receiver, as shown in Figure 4, a speaker system 52 is placed in each outside of the left side of the housing of the main element of a television receiver 51 and the right, its major advantage is exactly that the sound equipment that reproduces of stereo sound is answered effect, and obtains the sound pressure frequency characteristic of gratifying speaker system 52.But, bringing a problem thereupon, that is exactly to comprise that two speaker systems 52 make the width W of television receiver 51 become bigger.
In order to address the above problem, for example at the flat 2-288596 of Japanese Patent Application Publication file number an example is disclosed.The structure of this example provides in Fig. 5 a to 5c.
Fig. 5 a to 5c is several cross-sectional views, and it has illustrated the conventional example of a kind television receiver.Fig. 5 a is vertical sectional drawing of the television reception of looking from top, Fig. 5 b is the vertical view profile of in a Fig. 5 a speaker system 56 on the left position of looking from above, and Fig. 5 c is the vertical sectional drawing of among Fig. 5 a the speaker system on the leftward position 56 of looking from the right side.
In this described example, shown in Fig. 5 a, speaker system 56 has the structure shown in Fig. 5 b and 5c, and it is loaded into and is fixed in the gap of the sidewall 53 of main element housing of television receiver 51 and back casing 60 and 54 formation of a cathode ray tube.Speaker system 56 is to constitute like this, make a sound channel 58 is arranged in the front of speaker element 57, a rear cabinet 59 is arranged in the back of loudspeaker element 57, and a bass reflex passage 61 is used to produce sound equipment and answers sympathetic response and expand bass zone on rear cabinet 59.The sound channel 58 of speaker system 56 is inserted in the gap of 54 in the sidewall 53 of main element housing of television receiver 51 and cathode ray tube, and with screw it is fixed.Yet shown in Fig. 5 b and Fig. 5 c, because bass reflex passage 61 is at the rear portion of loudspeaker 56, the become path of the sound wave that the sound channel of installing previously 58 than speaker element 57 sent of the sound passage from bass reflex passage 61 to the audience is longer.As a result, a problem occurred, promptly the sound pressure level of bass becomes lower.When television receiver 51 is installed near wall, another problem appears again, and promptly the opening of bass reflex passage 61 gets clogged, and bass can not emit.
For solving the example that above-mentioned several problem proposes, as, in JAS (Japanese acoustics association) 1990 discussion, that delivers in advance is entitled as 212 to 215 pages of " loud speaker that is used for the band sound equipment passage of television receiver " literary compositions, and the 213rd page is as shown in Figure 3.The structure of given example as shown in Figure 6.Fig. 6 is vertically vertical sectional drawing of a speaker system of looking from the right side 62.
In Fig. 6, a sound channel 64 is connected in the front of loud speaker 63, and rear cabinet 65 is connected in the behind of loud speaker 63.66 acoustical couplings of bass reflex passage are in rear cabinet 65, and on the position of the upper and lower of sound channel 64, expand bass zone respectively in order to resonance of the voice, this passage 66 is fixed to dividing plate 67, and dividing plate 67 is used for keeping apart sound channel 64 and rear cabinet 65, and loud speaker 63 is installed on the dividing plate.In sound channel 64, used a kind of standing wave that is produced in 68 pairs of sound channels 64 of a kind of absorbing material to absorb, reflector 69 is used for acoustic reflection that emits from loud speaker 63 and the opening 64a that is directed to the sound channel of being installed 64.
Yet because the opening 66a of bass reflex passage 66 is positioned in the same plane with the opening 64a of sound channel 64, the length L of bass reflex passage 66 becomes longer.Because bass reflex passage 66 is elongated, it just correspondingly needs to increase the sectional area of bass reflex passage 66, and in upper and lower two parts of sound channel 64 two bass reflex passages is installed respectively.As a result, occurred a problem again, the overall height H that is promptly comprising the sound channel 64 of several bass reflex passages 66 becomes higher.
As shown in Figure 7, in order to reduce the total height of sound channel 64, will consider only to adopt upper and lower two one of containing among the bass passage 66.Yet one the time, the sectional area of bass reflex passage 66 also just correspondingly becomes littler among only using several bass reflex passages 66, and the sound quality Mp of bass reflex passage 66 becomes greatly like this.
In other words, suppose that bass reflex passage 66 is individual cylindrical, so at sound quality Mp, the available equation 1 of relation between the length L of Radius A p and bass reflex passage is represented, under this condition, when the sectional area of bass reflex passage 6 reduced, the sound quality Mp of bass reflex passage 66 was constants, and this just needs to reduce the length L of bass reflex passage 66.
Here
Mp: the sound quality of bass reflex passage
Ap: the radius of bass reflex passage
Ao: the effective radius of loud speaker
Po: atmospheric density
π: the girth of circle and the ratio of its radius
L: the length of bass reflex passage
The acoustic resonance frequencies Fp of bass reflex passage 66 can represent with equation 2:
Here
Fp: the acoustic resonance frequencies of bass reflex passage
Mp: the sound quality of bass reflex passage
The acoustic stiffness of the case of Sv: volumetric values V
π: the girth of circle and the ratio of its radius
When sound quality Mp becomes too big, the sound resonance frequency of bass reflex passage 66 is with regard to step-down, just with inconsistent from the phase place of loud speaker 3 sound wave that sends, so just produced a problem from 66 emitting sound wave of bass reflex passage, promptly bass zone can not be reproduced fully.In order to reduce the sound quality Mp of bass reflex passage 66, make it obtain a suitable acoustic resonance frequencies Fp, just need to increase height h, so that it increases the sectional area of bass reflex passage 66.Admire in the TV at a HDTV (high definition TV) or the widescreen that has 16: 9 screen width high ratios.The vertical size of television receiver has 4: 3 screen width high ratio television receivers and compares smallerly with conventional, and it just requires to reduce the overall height H of speaker system like this.
An object of the present invention is to solve the problem that exists in the above-mentioned prior art of mentioning, and provide a kind of speaker system of compact conformation, it can suitably shorten the length L of bass transmission channel, thereby reduced the total length H of sound channel, expanded bass zone with best acoustic resonance frequencies.
The invention provides a kind of display device that comprises speaker system, its speaker system has a sound channel that has a nonaxisymmetric opening at its front end, it forms the wall and the back cover of main element housing and is contained in the gap between the cathode ray tube in the shell at front housing, and speaker system comprises a loud speaker; A passage is positioned at the front of loud speaker, and is used for guiding forward sound wave; A rear cabinet is positioned at loud speaker and is used to block sound wave afterwards, and a dividing plate is used for isolating sound channel and rear cabinet, and it is used for installing loud speaker; A bass reflex passage is positioned at sound channel bottom or top, it and dividing plate mechanical connection, and its end stretches to a side opposite with rear cabinet from dividing plate, and the other end and rear cabinet carry out acoustical coupling.
When the length L of bass reflex passage suitably was provided with, the acoustic resonance frequencies that is produced became optimum, the sound wave that emits from speaker and from the mutual homophase of bass reflex passage emitting sound wave, and the bass range of reproducing with regard to making like this is expanded.Because the formation of bass reflex passage makes reflection channel be placed in going up of sound channel or the lower part, and with the dividing plate mechanical connection, its end stretches to a side opposite with rear cabinet from dividing plate, the other end and rear cabinet acoustical coupling, and the total height of speaker system just can reduce like this.A side opposite with rear cabinet is feasible to have an inclined plane on a low or high part of dividing plate if the bass reflex passage stretches to, bass reflex passage and this inclined-plane mechanical connection, this effect is the same with the volume that increases rear cabinet just, and the acoustic resonance frequency also can reduce.
A longitudinal sectional drawing of the speaker system of the television receiver of Fig. 1 a first embodiment of the invention.
Fig. 1 b is a longitudinal sectional drawing of the television receiver speaker system of second embodiment of the invention.
Fig. 2 a is a longitudinal sectional drawing of the television receiver speaker system of third embodiment of the invention.
Fig. 2 b is a longitudinal sectional drawing of the television receiver speaker system of four embodiment of the invention.
Fig. 3 is that of the television receiver speaker system of fifth embodiment of the invention is vertical
Fig. 4 is the front view that an explanation comprises the conventional example of television receiver speaker system.
Fig. 5 a, 5b and 5c are respectively the profiles that explanation comprises another conventional example of television receiver speaker system, and it is looked downwards from top; Look from top position, be positioned at the profile of speaker system 56 on the left side of Fig. 5 a; Look from the right, be positioned at the profile of speaker system 56 on the left side of Fig. 5 a.
Fig. 6 is the profile of another conventional example of explanation television receiver speaker system.
Fig. 7 is the cross section view of another conventional example of explanation TV loudspeaker system.
To be described with reference to several accompanying drawings below for several embodiments of the present invention.Fig. 1 a is a longitudinal sectional drawing of the speaker system 1 of first embodiment of the present invention.In Fig. 1 a, numeral 2 is represented a sound channel, 2a is the opening of sound channel, 3 is loud speakers, 4 is the dividing plates that loud speaker is housed, and 4a is an inclined-plane of dividing plate 4, and 5 is bass reflex passages, 6 is rear cabinets, and 7 is Huo Muhuozi resonators that are used to absorb the standing wave that is produced in sound channel 2.
Dividing plate 4 is kept apart the sound channel 2 that is contained in loud speaker 3 fronts and is contained in the rear cabinet 6 of loud speaker 3 back, and fixes loud speaker 3.The lower part of dividing plate 4 tilts.Bass reflex passage 5 links together with this sloping portion.Because bass reflex passage 5 links together with the oblique lower part of dividing plate 4, the length L of bass reflex passage 5 can be designed to short and through suitably selecting the lower tilt angle of dividing plate to obtain desirable characteristic.In addition, because the bottom of dividing plate 4 tilts, in fact the volume V of rear cabinet 6 has increased volume v.The result, because the length L of bass reflex passage 5 suitably shortens, in fact the volume V of rear cabinet 6 also increases volume V, acoustic resonance frequencies has reduced, the sound wave of launching from bass reflex passage 5 emitting sound wave with from loud speaker 3 frequency bandwidth of homophase each other has been broadened, and bass zone is expanded.
Because the length L of bass reflex passage 5 is by desirable suitable shortening, the height h of bass reflex passage 5 also can reduce, its result, and the overall height H of speaker system can reduce.
In first embodiment shown in Fig. 1 a, the openend of sound channel 2 is consistent with the openend of bass reflex passage 5.Yet in the second embodiment of the invention shown in Fig. 1 b, the length L of bass reflex passage 5 can be set like this, so that the openend of bass reflex passage 5 is placed in the inside of the openend of sound channel 2.
The opening shape of bass reflex passage can be designed to circle, square or oval-shaped as required.
Fig. 2 a is the longitudinal sectional drawing of the speaker system 1 of third embodiment of the invention.In Fig. 2 a, numeral 2 is represented a sound channel; 2a represents an opening of this sound channel, 3 represent a loud speaker, and a dividing plate of loud speaker is equipped with in 4 representatives, and 5 represent a bass reflex passage, 6 represent a rear cabinet, and 7 representatives are used for being absorbed in a Huo Muhuozi resonator of the standing wave that sound channel 2 produced.
In this embodiment, the lower tilt of the dividing plate 4 of loud speaker 3 is installed, bass reflex passage 5 is installed on the middle part of dividing plate 4a of inclination.
Like this, the expansion effect of bass zone is identical with first and second embodiment, and among bass reflex passage 5 is contained in sound channel 2 time, the overall height H of speaker system 1 can greatly reduce.
In the 3rd embodiment shown in Fig. 2 a, the dividing plate 4a part between bass reflex passage 5 and sound channel 2 bottoms also tilts.Yet in the 4th embodiment shown in Fig. 2 b, the formation of the part of the dividing plate 4a between the bottom of bass reflex passage 5 and sound channel 2 is perpendicular to the bottom of sound channel 2, so that fixing bass reflex passage 5 at an easy rate.
Fig. 3 is the longitudinal sectional drawing of the loud speaker 1 of fifth embodiment of the invention.In Fig. 3, numeral 2 is represented a sound channel, 2a represents an opening of this sound channel 2,3 represent a loud speaker, 4 representatives are equipped with a dividing plate of loud speaker, 5 represent a bass reflex passage, and 6 represent a rear cabinet, and 7 represent a Huo Muhuozi resonator that is used for being absorbed in the standing wave that sound channel 2 produced.
In third and fourth embodiment, tilt in the lower part of the dividing plate 4 that loud speaker 3 is housed, bass reflex passage 5 is installed in the middle part of the dividing plate 4a of inclination.But in this embodiment, dividing plate 4a and bottom are not oblique, and bass reflex passage 5 is connected in the bottom of sound channel 2.The bottom of the square-section of bass reflex passage 5 is as the bottom of sound channel 2.When the circular cross-section with bass reflex passage 5 replaced the square-section, the bottom of bass reflex passage 5 was such formations, so that it contacts with the bottom 2b line of sound channel 2.
The result, the expansion effect of bass area be identical at first to fourth embodiment, and when bass reflex passage 5 is contained in the sound channel 2, the bottom of bass reflex passage 5 as the bottom 2b of sound channel 2 or and the bottom 2b of sound channel 2 contact, the overall height H of speaker system 1 can greatly reduce.
Even the bottom 4a of fifth embodiment of the invention median septum 4 that ought be as shown in Figure 3 is vertical, but the bottom of bass reflex mouth 5 is not used as the bottom 2b of sound channel 2 or is directly connecting the bottom 2b of sound channel 2, also has a kind of structure, it has the part of dividing plate between the bottom 2b of the bottom of bass reflex passage 5 and sound channel 2, in aforesaid the 3rd embodiment shown in (Fig. 2 b), also can produce effect much at one.
As mentioned above, because the length L of bass reflex passage 5 can suitably shorten on demand, in fact the volume V of rear cabinet 6 increases the reduction of volume v acoustic resonance frequency like this, the sound wave of launching from bass reflex passage 5 emitting sound wave with from loud speaker 3 frequency bandwidth of homophase each other broadens, therefore, expanded bass zone.
Because, shortening the length L of bass reflex mouth 5 as required, the height h of bass reflex passage 5 also can reduce, the result, the overall height H of speaker system has also just reduced.
At a HDTV or have in the panavision of 16: 9 screen width high ratios, the vertical size of television receiver is compared littler with the conventional television receiver with 4: 3 screen width high ratios, so just need reduce the overall height H of loud speaker 1.Yet the overall height H of loud speaker 1 of the present invention is little, the HDTV receiver inside so that this loud speaker 1 can be packed into.
In above-mentioned loud speaker, bass reflex passage 5 is installed in the bottom of loud speaker 3.But bass reflex mouth 5 also can be contained in the top of loud speaker 3.Much less, even can be with the bass reflex passage 5 shown in Fig. 1 to 3, Huo Muhuozi resonator 7, and dividing plate 4 suitably and optionally makes up and constitutes, and can both obtain identical effect.
The alternative Huo Muhuozi resonator 7 of sound absorptive material.
When speaker system is installed in the side of television receiver main element housing, just wish that the opening shape of sound channel is vertically long.When speaker system is installed in the top of television receiver main element housing or bottom, just wish that the opening shape of sound channel is laterally long.
In the above description, the present invention will be described as an example to use television receiver.But the present invention can not only be used for television receiver, and can be used to comprise the display device of general information device.
Claims (12)
1. display device that comprises speaker system, its speaker system has a sound channel that has a nonaxisymmetric opening at its front end, it forms the wall and the back cover of main element housing and is contained in the gap between the cathode ray tube in the said shell at front housing, and said speaker system comprises a loud speaker; A passage is positioned at the front of said loud speaker, and is used for guiding forward sound wave; A rear cabinet is positioned at said loud speaker and is used to block said sound wave afterwards, and a dividing plate is used for isolating said sound channel and said rear cabinet, and it is used for installing said loud speaker; It is characterized in that:
A bass reflex passage is positioned at said sound channel bottom or top, it and said dividing plate mechanical connection, and its end stretches to a side opposite with said rear cabinet from said dividing plate, and the other end and said rear cabinet carry out acoustical coupling.
2. display device as claimed in claim 1 is characterized in that the bottom of described bass reflex passage and said dividing plate or the inclined-plane mechanical connection that top has.
3. display device as claimed in claim 1 is characterized in that the bottom or the top mechanical connection of described bass reflex passage and said sound channel.
4. according to claim 1,2 or 3 described display devices, the symmetrical openings that it is characterized in that the said non-axis of said sound channel is vertical long.
5. according to claim 1,2 or 3 described display devices, the said non-axis symmetrical openings that it is characterized in that said sound channel is laterally long.
6. according to claim 1,2 or 3 described display devices, it is characterized in that the opening at the said end of said bass reflex passage is a rectangle.
7. according to claim 1,2 or 3 described display devices, it is characterized in that the opening at the said end of said bass reflex passage is circular.
8. according to claim 1,2 or 3 described display devices, it is characterized in that the opening at the said end of said bass reflex passage is oval.
9. according to claim 1,2 or 3 described display devices, a described end that it is characterized in that said bass reflex passage is the inside on said sound passage openings surface.
10. according to claim 1,2 or 3 described display devices, the major part that it is characterized in that said bass reflex passage total length is from a said dividing plate side opposite with said rear cabinet.
11. according to claim 1,2 or 3 described display devices, the major part that it is characterized in that said bass reflex passage total length is in said sound channel inside.
12., it is characterized in that the top of said bass reflex passage or bottom are to touch with the top of said sound channel or bottom connection or shared according to claim 1,2 or 3 described display devices.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP094708/94 | 1994-05-09 | ||
| JP094708/1994 | 1994-05-09 | ||
| JP9470894A JPH07303293A (en) | 1994-05-09 | 1994-05-09 | Display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1116800A CN1116800A (en) | 1996-02-14 |
| CN1062681C true CN1062681C (en) | 2001-02-28 |
Family
ID=14117667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95106514A Expired - Fee Related CN1062681C (en) | 1994-05-09 | 1995-05-09 | Display device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH07303293A (en) |
| CN (1) | CN1062681C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19601217C1 (en) * | 1996-01-15 | 1997-07-24 | Mark Iv Audio Deutschland Gmbh | Bass reflex box |
| AU2003211521A1 (en) * | 2002-03-15 | 2003-09-29 | Sharp Kabushiki Kaisha | Image display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0303912A2 (en) * | 1987-08-14 | 1989-02-22 | EWD Electronic-Werke Deutschland GmbH | Woofer-loudspeaker box |
| JPH02288596A (en) * | 1989-04-28 | 1990-11-28 | Nec Home Electron Ltd | Speaker system |
| EP0480087A1 (en) * | 1990-10-10 | 1992-04-15 | Kabushiki Kaisha Kenwood | Low frequency loudspeaker system |
| US5119429A (en) * | 1988-05-06 | 1992-06-02 | Societe Electronique De La Region Pays De Loire | Audio installation, in particular stereophonic, for television sets with a large built-in low-frequency loudspeaker |
-
1994
- 1994-05-09 JP JP9470894A patent/JPH07303293A/en active Pending
-
1995
- 1995-05-09 CN CN95106514A patent/CN1062681C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0303912A2 (en) * | 1987-08-14 | 1989-02-22 | EWD Electronic-Werke Deutschland GmbH | Woofer-loudspeaker box |
| US5119429A (en) * | 1988-05-06 | 1992-06-02 | Societe Electronique De La Region Pays De Loire | Audio installation, in particular stereophonic, for television sets with a large built-in low-frequency loudspeaker |
| JPH02288596A (en) * | 1989-04-28 | 1990-11-28 | Nec Home Electron Ltd | Speaker system |
| EP0480087A1 (en) * | 1990-10-10 | 1992-04-15 | Kabushiki Kaisha Kenwood | Low frequency loudspeaker system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1116800A (en) | 1996-02-14 |
| JPH07303293A (en) | 1995-11-14 |
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| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |