JPS6342616Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention applies to projection television receivers.
In particular, the present invention relates to improvements in the acoustic device of this receiver.

BACKGROUND TECHNOLOGY Practical trial broadcasting using an audio multiplexing system has recently begun in Japan's television broadcasting. This method adds another sound to the conventional television sound, and allows you to broadcast two languages (for example, Japanese and English) for one video, making it possible to choose between them, or stereo broadcasting. It was made so that it could be done.

Particularly when receiving and reproducing stereo broadcasts, speakers are placed on each side of the television receiver in order to extract left and right stereo sounds.

On the other hand, in recent years, along with such stereo broadcasting, screens have become larger in order to increase the power of images, and a typical example is a projection type television receiver with a large reflective screen.

The conventional sound device for this projection type television receiver is simply a pair of speakers arranged on both sides of a reflective screen that projects an image, as seen in, for example, Japanese Utility Model Application Publication No. 55-93173. It was hot.

Problems that the invention aims to solve As mentioned above, in order to increase the power of images, the screen must be made larger, and in order to obtain a sense of realism, the reproduced sound must be played back in stereo using a pair of speakers. It is effective to do so.

However, when a projection type television receiver is enlarged in order to increase the impact of image reproduction, the screen becomes a concave surface with a predetermined curvature. Therefore, the viewing range of the image projected on the screen is limited to a specific area in front of the screen.

On the other hand, when stereo reproduction is performed using a pair of speakers to give the reproduced sound a sense of presence, the directivity of the pair of speakers is such that the sound image is localized at the apex of a triangle whose side is the line connecting both speakers. It is necessary to establish Therefore, when a pair of speakers are placed on both sides of a screen, the position where the stereo effect is highest is limited to a specific area in front of the screen.

The present invention focuses on this point and attempts to solve what kind of structure is desirable in order to obtain the most powerful video and audio as well as a sense of realism in this type of device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structure of an audio device for more effectively enjoying stereo broadcasts using an audio multiplexing method in a projection television receiver.

Means for Solving the Problems The present invention provides a reflection type projection television receiver that reflects and projects an image projected from a cathode ray tube onto a screen having a predetermined curvature. The screen has a structure in which at least one pair of speakers are arranged on a trajectory drawn according to a predetermined curvature of the screen.

According to the sound device for a projection television receiver of the present invention, a pair of speakers are placed close to each other on both sides of the screen and are placed on a trajectory drawn according to a predetermined curvature of the screen on which an image is projected. This allows you to localize the left and right stereo sound images at the optimal viewing position for the image projected on the screen, allowing you to view the optimal and powerful image along with the realistic stereo playback sound. .

Embodiment FIG. 1 is a perspective view of a projection television receiver to which an embodiment of the present invention is applied. 1 is the screen,
Reference numeral 2 denotes a storage section containing a receiver circuit, a cathode ray tube, a lens, and the like. A cabinet 3 supports the screen 1 via a support frame 11. Reference numeral 4 designates a lid body with a plane mirror disposed on its inner surface, which reflects the image beam emitted from the storage section 2 to form an image on the screen 1. Reference numerals 5 and 6 designate speaker boxes arranged and supported adjacent to the left and right sides of the screen 1. 51 and 61
The speakers in the respective speaker boxes 5 and 6 are shown with broken lines.

FIG. 2 shows a side view of the receiver shown in FIG.
21 indicates a cathode ray tube, a lens, etc., and 41 indicates a plane mirror. Arrows V ₁ and V ₂ are video rays, and S ₁ indicates the direction in which audio is transmitted.

The support part that supports the speaker boxes 5 and 6 is
Here, the screen support frame 11 itself is used, but in the present invention, it does not necessarily have to be this.
For example, it may have a structure extending from the cabinet 3. At this time, the speakers 51, 61
The central axis of is considered to be on a locus drawn according to a predetermined curvature formed on the surface of the screen 1.

3 and 4 show speaker box 5,
FIG. 6 is a side view of another embodiment showing a variety of selected positions for attaching the screen to the screen support frame 11 of No. 6; In this example, speaker boxes 5 and 6
is arranged so that it is vertical. In this case, although the central axes of the speakers 51 and 61 are horizontal, consideration is given to making them at a predetermined angle in the horizontal direction.

On the other hand, the speaker boxes 5 and 6 are connected to the support frame 1.
1 may be rotatably supported, and the angle of the central axis of the speaker may be appropriately selected in the vertical direction. In addition, speaker boxes 5 and 6 are transported,
It may be made so that it can be removed from the support frame 11 for cleaning.

FIG. 5 is a side view of the embodiment showing a state in which the speaker boxes protrude forward from the screen 1 on both sides of the screen 1. By arranging them in this way, unnecessary light rays are not irradiated onto the screen from the sides. This makes it possible to prevent

Figure 6 shows the screen 1 itself enlarged on both sides.
7 is a perspective view of another embodiment showing a state in which speakers 51 and 61 are directly attached to the screen 1. FIG. As is well known, the screen 1 is given a predetermined curvature in order to project an optimally bright image, and therefore the optimal position for the viewer to view the image is also determined. Therefore, here, the speakers are also arranged along the curvature. As a result, the center of the speaker also moves toward the optimal position of the image. That is, by setting the directivity of the speakers in this way, the sound images of the sounds emitted from both the left and right speakers are localized at the center of the sphere formed by the surface of the screen. This means that the center point of this sphere is the optimal position for both video and sound images. Furthermore, in the example shown in FIG. 6, the sound effect can be doubled during stereo broadcasting due to the buffling effect produced by the screen itself.

Effects of the invention As described above, according to the invention, sound is emitted from the left and right sides of a large screen such as 50 to 70 inches, and the sound image is localized to the optimal viewing position of the video, so that it can be seen on the playback screen. It provides an unprecedented acoustic impact and provides the power and presence of a large screen that is desired for this type of device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a projection television receiver to which one embodiment of the present invention is applied, FIG. 2 is a side view of the same, and FIGS. 3 to 5 are side views of other embodiments of the present invention. FIG. 6 is a perspective view of still another embodiment. 1... Screen, 51 and 61... Speaker, 11... Screen support frame.

Claims (1)

[Scope of utility model registration request] In a reflection projection television receiver that reflects and projects an image projected from a cathode ray tube onto a screen having a predetermined curvature, at least a pair of speakers provided close to each side of the screen are connected to the screen. 1. An acoustic device for a projection television receiver, characterized in that the acoustic device is arranged on a trajectory drawn according to a predetermined curvature of the projection television receiver.