JP3271971B2 - Speaker device for television receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a speaker device of a television receiver provided in a television receiver.

[Summary of the Invention]

The present invention provides a sealed first chamber having a passive diaphragm disposed on the same plane as a screen, a second chamber provided in contact with the first chamber and having an open portion, A driving speaker disposed at a boundary position between the room and the second room, and transmitting sound from the driving speaker to the outside from the passive diaphragm and also from the opening of the second room to the outside, thereby reducing The range of the television receiver is expanded, and it is possible to cut unnecessary middle and high frequency ranges to obtain good low sound quality, and also to enhance the sense of presence and unity with video. A speaker device is provided.

[Conventional technology]

2. Description of the Related Art Conventionally, as a so-called speaker device for reproducing audio, voice, and the like, there is a speaker device as shown in FIGS. 8 to 11, for example.

In FIG. 8, a closed-type cabinet 70 of a speaker device is provided with a large-diameter speaker (so-called woofer) 71 for low frequencies and a so-called tweeter 72 for high frequencies. In the speaker device shown in FIG.
The expansion of the bass range is aimed at. In FIG.
The cabinet 80 has a so-called bass reflex port 83 in addition to the woofer 81 and the tweeter 82, and the bass reflex port 83 extracts sounds in the cabinet 80. In FIG. 10, a woofer 91 and a so-called passive diaphragm 94 are arranged in a closed cabinet 90. According to the speaker device of FIG. 10, the passive diaphragm 94 is driven by the air vibration in the cabinet 90 by the woofer 91 (driving by resonance), so that the sound radiation area of the speaker device is enlarged. The bass range is expanded. The speaker device shown in FIG. 11 has a so-called horn type cabinet 100 in which a speaker 101 is disposed in a horn portion 105.

In each of these loudspeakers, except for the horn type loudspeaker shown in FIG. 11, each woofer 71, 81, 91 has its own low-frequency resonance (frequency f ₀ ) and bass reflex port 83 (the speaker shown in FIG. 9). Resonant or passive diaphragm 94 (10th
The bass range is expanded by resonance of the speaker device shown in FIG. Also, in the horn type speaker device of FIG. 11, the bass range is expanded by the horn portion.

[Problems to be solved by the invention]

By the way, in recent television receivers, high image quality, large screen, and high sound quality have been achieved. In particular, with regard to the sound quality, it is desired to expand a low sound range corresponding to a high image quality and a large screen. As described above, in order to expand the bass range, it is effective to use the large-diameter woofer or horn for bass as described above.

Also, the sound in the television receiver may be radiated from the same plane as the television screen, for the purpose of giving a sense of presence to the image of the television screen or a sense of unity with the video. preferable.

Further, it is desirable that the size of the television receiver is not increased even if the screen is enlarged as described above.

However, usually, the speaker device of the television receiver is often provided in the housing of the television receiver (or the housing itself), and therefore, the size of the speaker device (that is, the aperture, the magnetic The size of the speaker due to the circuit and the like is also limited by the housing.
As described above, since the size of the speaker device is limited,
For example, it is difficult to mount a large-diameter woofer for bass on the same plane as a television screen.

As described above, in the conventional television receiver, it is necessary to satisfy all of the requirements for a large screen and a non-large housing, high sound quality (enlargement of a low sound range), a sense of realism, and a sense of unity with a video. Has become very difficult.

In view of the above, the present invention has been proposed in view of the above-described circumstances, and it is possible to expand the bass range without increasing the size of the housing of the television receiver. It is an object of the present invention to provide a speaker device of a television receiver which can provide a sense of unity.

[Means for solving the problem]

A speaker device of a television receiver according to the present invention has been proposed to achieve the above-described object, and includes a passive diaphragm disposed on the same plane as a television screen, and includes the passive diaphragm. A first chamber disposed behind and sealed to the passive diaphragm, a second chamber provided in contact with the first chamber and having an open portion, and the first chamber and the second chamber. And a driving speaker provided at a rear portion capable of taking a large area according to the shape of the cathode ray tube, wherein the sound emitting area of the passive diaphragm is at least larger than the sound emitting area of the driving speaker. The first chamber is configured such that the cross-sectional area decreases toward the surface of the cathode ray tube which is the front surface of the television receiver, and the sound from the driving speaker is transmitted to the outside from the passive diaphragm. Rutotomoni, is characterized in that to convey to the outside from the opening of the second chamber.

[Action]

According to the invention, the passive diaphragm is provided with a sealed first
Resonating with the vibration of the driving speaker in the positive phase via the air in the room, the sound radiation area increases. In addition, since the sound from the driving speaker is also radiated to the outside through the second chamber,
The bass range is expanded.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of a television receiver 20 having a speaker device according to an embodiment of the present invention, and FIG. 2 is a schematic longitudinal sectional view of only the speaker device.

The speaker device of the television receiver 20 of the present embodiment shown in FIGS. 1 and 2 includes a passive diaphragm 32 disposed on the same plane as a television screen (CRT) 10.
A first chamber 34 disposed behind the passive diaphragm 32 and sealed so that the passive diaphragm 32 becomes a part of a wall surface, and provided in contact with the first chamber 34; It has a second chamber 35 having an opening as a bass reflex port 33, and a driving speaker 36 disposed at a boundary between the first chamber 34 and the second chamber 35. Is transmitted from the passive diaphragm 32 to the outside, and the second
The air is transmitted to the outside also from the open part of the room 35 (bass reflex port 33). As the drive speaker 36, for example, a woofer or a speaker for all bands is used. In addition,
The television receiver 20 shown in FIG. 1 has two speaker devices on the left and right of the cathode ray tube surface 10 for reproducing stereo sound.

That is, in FIGS. 1 and 2, the passive diaphragm 32 resonates with the vibration of the drive speaker 36 via the air in the sealed first chamber 34 (resonates in the positive phase, The resonance frequency is, for example, 100 Hz. The sound radiation area of the passive diaphragm 32 is at least larger than the sound radiation area of the drive speaker 36.
3 to 5 times (or 1 to 5 times) the size of the sound radiation area of Therefore, the passive diaphragm 32 expands the sound radiation area and expands the low frequency range. Also, this passive diaphragm 32
Since it is on the same plane as the cathode-ray tube surface 10, the sound emitted from the passive diaphragm 32 can provide a sound having a sense of presence or a sense of unity with the image on the television screen. Further, since the passive diaphragm 32 does not vibrate at a frequency exceeding the resonance frequency (for example, 100 Hz) with the drive speaker 36, unnecessary high-range (middle-high range) sound is not generated. That is, as will be described later with reference to FIG. 5, unnecessary middle and high frequency components generated due to the shape of the interior of the first chamber 34 are not emitted to the outside, so that a good bass range can be obtained. The passive diaphragm 32 is made of, for example, cone paper, aluminum honeycomb structural material, styrene foam, a rubber plate whose surface is laminated, or the like.

Further, the air vibration of the drive speaker 36 on the side of the second chamber 35 is transmitted to the outside also from the open portion of the second chamber 35 as the bass reflex port 33. For this reason, the drive speaker 36 and the second chamber are connected from the bass reflex port 33.
A bass sound having a resonance frequency of 35 (for example, 50 Hz) can be extracted to the outside.

In FIGS. 1 and 2, a speaker (tweeter) 31 for reproducing middle and high frequency sounds is provided. The mid-high range speaker 31 is provided in the housing of the television receiver 20 together with the closed third room 37. As a result, middle and high range sounds can be reproduced well.

FIG. 3 is a schematic cross-sectional view of the television receiver 20 of FIG. That is, the television receiver 20
As described above, the image quality and the size of the screen are increased as described above, but the size of the housing of the receiver 20 cannot be increased. For this reason, a large-diameter speaker such as the drive speaker 36 cannot be arranged on the same plane as the cathode-ray tube surface 10 of the television receiver 20. On the contrary,
In the present embodiment, the passive diaphragm 32 having a radiation area approximately equal to or larger than the sound radiation area of the drive speaker 36 is used.
Are provided on the same plane as the cathode ray tube surface 10. In other words, since the driving speaker 36 is arranged at the rear part which can take a large area (or large volume) according to the shape of the cathode ray tube, the diameter and the magnetic circuit (the diameter of the speaker and the magnetic circuit) are large. Will be able to Note that it is conceivable to dispose the speaker itself on the same plane as the cathode ray tube surface 10 of the television receiver 20 (position where the passive diaphragm 32 is disposed). In order to obtain a radiation area, the speaker has to make the cone paper 53 vertically long, for example, as shown in FIG. However, in order to drive this vertically long speaker, a magnetic circuit 51 that exceeds the width of the cone paper 53 is required.
Can not be arranged in the case of. Further, since the cone paper 53 on the left and right portions of the voice coil 52 has insufficient strength and this portion does not effectively act on sound reproduction, it is not preferable to use a vertically long speaker as described above.

By the way, as shown in FIG. 5, the first chamber 34 has a smaller sectional area toward the front surface (in the direction of the cathode ray tube surface 10). That is, it has a structure opposite to that of the horn type speaker device of FIG. In the case of such a structure, usually, an unnecessary audio component is easily generated in a middle and high frequency range. However, the passive diaphragm 32 of the present embodiment does not vibrate above the resonance frequency with the driving speaker 36 as described above, so that unnecessary sound components in the middle and high frequency ranges do not go outside.

From the above, as shown in FIG. 6, the frequency characteristics when the speaker device of the present embodiment is used (the characteristics indicated by solid lines in the figure) and the frequency characteristics when the passive diaphragm 32 and the like are not provided. From the comparison with (the characteristic shown by the dotted line in the figure), it can be seen that the speaker device of the present embodiment has a low-frequency expansion. From FIG. 6, it can be seen that the loudspeaker device of the present embodiment is reduced by 6 dB at 50 Hz.

FIG. 7 is a view in which the installation direction of the drive speaker 36 in FIG. 2 is reversed. Also in this case, a bass expansion effect can be obtained as in FIG. Further, the driving speaker 36 installed in the opposite direction also functions as a filter for reducing unnecessary high frequencies.

As described above, according to the speaker device of the television receiver 20 of the present embodiment, the hermetically sealed first diaphragm 32 having the passive diaphragm 32 disposed on the same plane as the CRT surface 10 is provided.
By arranging the driving speaker 36 at the boundary between the room 34 and the open second room 35, the bass range is expanded, and unnecessary middle and high ranges are also cut to obtain good bass sound quality. It is possible to provide a sense of presence and a sense of unity with the image. Furthermore, since the speaker 31 for reproducing the middle and high pitches is also provided, it is possible to reproduce good middle and high pitches.

〔The invention's effect〕

In the speaker device of the television receiver of the present invention, a passive diaphragm disposed on the same plane as the screen,
A first chamber including the passive diaphragm, disposed behind the passive diaphragm and hermetically closed; a second chamber provided in contact with the first chamber and having an open portion; And a driving speaker provided at a rear portion where a large area can be taken according to the shape of the cathode ray tube, which is disposed at a boundary position between the room and the second room, and the sound emission area of the passive diaphragm is
The first room is provided at least wider than the sound emission area of the driving speaker, and the first chamber is configured such that the cross-sectional area decreases toward the surface of the cathode ray tube which is the front surface of the television receiver. By transmitting the sound from the passive diaphragm to the outside and also from the opening of the second chamber to the outside, the bass range is expanded, and unnecessary middle and high ranges are also cut to provide good bass sound quality. In addition to being able to obtain, a sense of presence and a sense of unity with the image can also be obtained.

[Brief description of the drawings]

1 is a schematic perspective view of the appearance of a speaker device according to an embodiment of the present invention, FIG. 2 is a schematic longitudinal sectional view of the speaker device, FIG. 3 is a schematic transverse sectional view of a television receiver, and FIG. Is a schematic front view of a vertically long speaker, FIG. 5 is a schematic perspective view of only the speaker device, FIG. 6 is a characteristic diagram showing frequency characteristics,
FIG. 7 is a schematic longitudinal sectional view of another example of the speaker device, and FIGS. 8 to 11 are schematic front views or schematic longitudinal sectional views of a conventional speaker device. 10 CRT surface 20 Television receiver 31 Speaker for mid-high range 32 Passive diaphragm 33 Bass reflex port 34 First room 35 Second room 36 Driving speaker 37 …… Room 3

Continuation of the front page (56) References JP-A-64-89700 (JP, A) JP-A-64-1396 (JP, A) JP-A 63-183788 (JP, U) JP-A 64-8881 (JP , U) Actually open sho 54-40118 (JP, U)

Claims (1)

(57) [Claims] 1. A passive diaphragm disposed on the same plane as a television screen, a first chamber including the passive diaphragm, and disposed and sealed behind the passive diaphragm, and a first chamber, A second chamber provided in contact with the first chamber and having an open portion; and a rear chamber disposed at a boundary between the first chamber and the second chamber and having a large area according to the shape of the CRT. And a sound radiating area of the passive diaphragm is provided to be larger than at least a sound radiating area of the driving speaker. The first room is directed toward a surface of a cathode ray tube serving as a front surface of a television receiver. The sound transmitted by the driving speaker is transmitted to the outside from the passive diaphragm and also transmitted to the outside from the opening of the second chamber. Speaker device of the receiver.