JPH0635489A - Speaker system for television - Google Patents

Abstract

PURPOSE:To localize a sound image closely to the center part in front of a television screen by providing a finned acoustic lens to the front surface of a speaker and making the fins close to the television screen long. CONSTITUTION:A center channel speaker part 4 provided on the television screen of a cathode-ray tube 1 at the upper center part and lower center part is provided with the finned acoustic lens 7 which directs the sound from the speaker 5 to the center part in front of the television screen. The finned acoustic lens 7 is composed of fins which adjust the sound velocity and the fins are arranged in front of the speaker 5 vertically at specific intervals so that the length direction is horizontal. Further, the fins have the width direction at an acute angle theta to the sound radiation center direction of the speaker and the width is made longer and longer as they are closer and closer to the television screen. A sound wave radiated from the speaker 5 when passing through the finned acoustic lens 7 is refracted toward the center of the television screen and becomes lower in apparent sound speed, so that the wave is converged closely to the center of the television screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a television speaker device having an acoustic lens.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view of a television having a conventional television speaker device. In FIG. 4, 1 is a cathode ray tube, and 2 is a cathode ray tube 1 with a screen of the cathode ray tube 1 exposed to the outside through an opening. And the like, a TV housing 3 for housing the left and right channel speaker parts provided on the left and right side surfaces of the TV housing 2, and 4 a center channel speaker part provided on the top and bottom sides of the TV housing 2. Is.

Next, the operation will be described. CRT 1
Displays the video signal as an image on the screen, and the left and right channel speaker unit 3 acoustically reproduces the main audio signal. When the audio signal has three channels, the center channel speaker unit 4 is also operated to reproduce sound.

[0004]

Since the conventional television speaker device is constructed as described above, it is directed from the center channel speaker portion 4 toward the front of the screen from the position above or below the TV screen. There was a problem that the sound radiated could not be properly localized toward the front center of the screen.

As shown in FIG. 3 (a), even when the speakers are arranged both above and below the screen in the same direction as the screen front direction, the sound radiation center direction is deviated from the center axis of the screen. This is because the sound pressure of the arrival sound from the upper and lower speakers is different in the front of the screen, and the localization direction of the sound image does not match the center of the front of the screen. Further, when the center channel speaker unit is arranged only on one side above and below the screen, the above problem becomes even more serious.

In addition to this, a speaker device for a television set disclosed in, for example, Japanese Unexamined Patent Publication No. 3-94598 has a reflector inside a sound tube arranged in the front of the speaker so that sound can be transmitted in a specific direction. And an acoustic lens. However, this speaker device has a problem that the structure is complicated and the cost is high because the acoustic tube, the reflector, and the acoustic lens are combined.

The present invention has been made to solve the above problems, and even if the speakers are arranged above or below the television screen or both above and below the television screen, the sound image is located near the center of the front of the screen. It is an object of the present invention to obtain a speaker device for a television that can be localized and can be inexpensive with a simple structure.

[0008]

SUMMARY OF THE INVENTION A television speaker device of the present invention is provided with a speaker at an upper side, a lower side, or both upper and lower sides of a television screen, and an acoustic structure in which fins are arranged in parallel on the front side of the speaker. With a lens,
The fin of this acoustic lens has a relatively long width as it approaches the TV screen.

[0009]

The television speaker device according to the present invention comprises:
By the action of the acoustic lens with fins provided on the front of the speaker, the radiated sound is refracted toward the front center of the screen, improving the directional characteristics on the screen side and lengthening the fin near the TV screen. The apparent sound velocity on the side close to is reduced to eliminate the phase difference, and the sound image is localized near the front center of the TV screen.

[0010]

【Example】

Example 1. FIG. 1 is a perspective view of a television having a television speaker device according to an embodiment of the present invention. In FIG. 1, constituent elements indicated by reference numerals 1 to 4 indicate the same or corresponding portions as those of the conventional one shown in FIG. 4, and the description thereof will be omitted. As shown in the cross section of FIG. 2, the center channel speaker unit 4 provided at the upper center portion and the lower center portion with respect to the television screen of the cathode ray tube 1 has the same sound radiation center direction as the television screen front direction. The speaker 5 is arranged so as to be oriented in the direction, and the speaker cabinet 6 is housed so as to cover the rear portion of the cone of the speaker 5 and accommodate it.

Reference numeral 7 denotes a fin-shaped acoustic lens composed of a plurality of fins for directing the sound radiated from the speaker 5 to the front center portion of the television screen of the cathode ray tube 1 and adjusting the speed of sound. As shown in FIG. 2, the fin-shaped acoustic lens 7 is composed of a plurality of thin and thin plate-shaped fins, and the fins have a horizontal direction in the longitudinal direction and have predetermined intervals. The speakers 5 are arranged side by side in the vertical direction on the front side of the speakers 5 and are aligned so that their rear ends are on the same vertical plane.

Further, the fins of the fin-shaped acoustic lens 7 are
The width direction from the rear end to the front end forms an acute angle of θ with respect to the sound radiation center direction of the speaker 5, and is inclined toward the front side of the television screen. Moreover, the fin of the fin-shaped acoustic lens 7 has a width that increases as the fin is closer to the television screen of the cathode ray tube 1.

Next, the main part of the operation of the first embodiment will be described with reference to FIGS. 1 and 2. When the sound wave radiated from the speaker 5 passes between the fins of the fin-shaped acoustic lens 7, the longer the width of the fin, the longer the sound wave needs to travel along the longer path. Sound velocity decreases. Therefore, the sound wave radiated from the speaker 5 is
After passing through the fin-shaped acoustic lens 7, it is refracted toward the front center of the TV screen, and the sound velocity near the TV screen has a slower apparent sound speed, and the energy of the radiated sound is greater than that of the sound without the fin-shaped acoustic lens 7. , In order to concentrate toward the front center of the TV screen, the sound image localization can be connected to the front center of the TV screen.

FIG. 3A shows a sound pressure distribution pattern according to the conventional example, and FIG. 3B shows a sound pressure distribution pattern according to the first embodiment. In FIG. 3, the horizontal axis represents O at the center of the TV screen, and the vertical distance (left side is the upper side, right side is the lower side), and the vertical axis is the plane including the TV screen as O, and the distance in the front direction from the plane. The solid line shows the sound pressure from the top speaker, and the broken line shows the sound pressure from the bottom speaker. Figure 3
As shown in (b), according to the first embodiment, the sound pressure distributions by the speakers above and below the TV screen are almost the same, and the sound waves are spread spherically around the center of the TV screen. Can be tied near the front center.

Example 2. Although the example in which the speaker and the fin-shaped acoustic lens are arranged on the upper and lower sides of the television screen is shown in the first embodiment, it may be arranged on either the upper side or the lower side, and the same effect as that of the first example is achieved by the effect of the fin-shaped acoustic lens. .

Embodiment 3. Although the example in which the fin-shaped acoustic lens and the speaker are installed in the television has been shown in the above-described embodiment, the same effect as in the above-described example can be obtained by disposing the fin-shaped acoustic lens and the speaker on at least one of the upper and lower sides of the projection television and the screen.

[0017]

As described above, according to the present invention, the fin-shaped acoustic lens is disposed on the front side of the speaker provided on the upper side, the lower side, or both the upper side and the lower side of the television screen, and the fin is close to the television screen. Since the width is made longer, the sound image can be localized near the center of the front of the screen, and since the fins are simply added, there is an effect that the structure is simple and the cost is low.

[Brief description of drawings]

FIG. 1 is a perspective view of a television including a television speaker device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of an upper central portion or a lower central portion according to the above embodiment.

FIG. 3 is a diagram showing a sound pressure distribution pattern of a conventional example and the above-mentioned one example.

FIG. 4 is a perspective view of a television including a conventional television speaker device.

[Explanation of symbols]

 1 CRT 4 Speaker for center channel 5 Speaker 7 Fin-shaped acoustic lens

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[Procedure amendment]

[Submission date] December 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

Since the conventional television speaker device is configured as described above, the center channel speaker portion 4 located on the upper side or the lower side of the television screen is directed toward the front of the screen. There was a problem that the sound radiated could not be properly localized toward the front center of the screen.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

As shown in FIG. 3A, even when speakers are arranged above and below the screen in the same direction as the screen front direction, the sound axis direction deviates from the center axis of the screen. This is because the sound pressure of the arrival sound from the upper and lower speakers differs in the front of the screen, and the localization direction of the sound image does not match the center of the front of the screen. Further, when the center channel speaker unit is arranged only on one side above and below the screen, the above problem becomes even more serious.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

Next, the main part of the operation of the first embodiment will be described with reference to FIGS. 1 and 2. When the sound wave radiated from the speaker 5 passes between the fins of the fin-shaped acoustic lens 7, the longer the width of the fin, the longer the sound wave needs to travel along the longer path. Sound velocity decreases. Therefore, the sound wave radiated from the speaker 5 is
When it passes through the fin-shaped acoustic lens 7, it is closer to the TV screen.
Sound waves have a slower apparent speed of sound and appear in front of the TV screen.
Since the energy of the radiated sound refracted toward the center is more concentrated toward the front center of the TV screen than that without the fin-shaped acoustic lens 7, the sound image localization can be connected to the front center of the TV screen.

Claims (1)

[Claims] 1. A speaker is provided at an upper side, a lower side, or both upper and lower sides of a television screen, and an acoustic lens having a plurality of fins arranged in parallel is provided on the front side of the speaker. A TV speaker device characterized in that the closer to the TV screen the width to the tip is relatively longer.