JPH0344177A - Back project type television receiver - Google Patents

Abstract

PURPOSE:To obtain powerful reproduction sound quality by providing a speaker system exclusively for low sound frequency reproduction to a specific space in the inside of a case. CONSTITUTION:The television receiver has a speaker enclosure 10 containing closely a speaker 9 in its center at both lower sides, a cabinet 1 having sounding holes 11 is placed to a rear face, and a screen block 2 projecting a video image, a control panel 14, a speaker grill 13 and a front face cover 8 are arranged to the front face side. Moreover, a super-woofer 7 sounding only a low sound frequency is arranged to the upper left of the cabinet 1. The super-woofer 7 reproduces only a low sound frequency of 200Hz or below and the reproduced sound radiates externally through the sounding holes 11 provided to the rear face of the cabinet 1. Thus, the speaker reproduces up to an untralow sound frequency band and powerful reproduced sound is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of audiovisual applications] The present invention relates to a rear projection television set that improves the quality of reproduced sound, particularly the ability to reproduce low frequencies.

[Conventional technology]

As described in Japanese Utility Model Application Publication No. 62-58585, conventional rear projection televisions are equipped with the front left and right sides of the lower part of the housing.
It was just a speaker installed in the corner.

[Problem to be solved by the invention]

The above-mentioned conventional technology is not sufficient in terms of reproduction sound quality, and is particularly unsatisfactory in terms of IL power (low frequency reproduction). This is because the projection tube, lens, gIA expulsion circuit board, etc. are arranged in the lower part of *1, and it is difficult to close the speaker unit as an enclosure. Even if an enclosure was provided, the internal volume was relatively small and the bass reproduction ability was unsatisfactory.

Therefore, in order to obtain sufficient bass, it was necessary to add an external speaker system with a fairly large cabinet outside the housing, which significantly hindered the user's convenience in terms of space.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rear projection television with improved bass reproduction ability and impressive sound quality without using external speakers.

Another object of the present invention is that it can be easily realized in manufacturing without increasing the size of the cabinet itself. An object of the present invention is to provide an IR type TV V with improved bass reproduction ability.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides specific information on the inside of a casing that constitutes a rear projection television. 2! A speaker system (hereinafter referred to as "super woofer") with bass reproduction capability was installed in between.

Further, in order to achieve the other object described above, in the present invention, the specific space in which the superwoofer is provided is a space corresponding to a relatively upper portion of the screen inside the housing, and, The space is assumed to be a space that is not used as an optical path for projection light from the projection tube to the screen via the lens and reflecting mirror.

[Effect]

The rear projection TV casing houses the projection tube, lens, and peripheral W1 board at the bottom, but the top only holds the screen on the front and the reflector on the rear, and the inside of it holds the screen more than the projection tube. It is merely used as an optical path for the projected light.

On the other hand, the casing is constructed into a nearly rectangular parallelepiped due to the manufacturing process, but since the optical path is shaped like a three-dimensionally folded square pyramid, it can also be used as a storage area in the mold kingdom. There is a considerable amount of dead space that is not used as an optical path. By providing a super woofer here, it is possible to easily fold the enclosure dam necessary for bass reproduction. That charge 1. X -/<-The woofer has the power to reproduce sounds even lower than the speakers housed at the bottom of the housing. This super woofer is approximately 20,011 out of the audio input signal.
Bass parts below z are played back, and sounds higher than that are played back by the speaker at the bottom of the housing, but the overall bass playback ability is significantly improved, and the playback quality becomes a powerful struggle.

In the case of audio FG or stereo, it is possible to install a super woofer for each R, but since it has little effect on sound image localization in the bass, the bass of LjR should be minxed and played from one super woofer. Also good.

Also, even if the sound emitting part is not in the previous song due to Mr. 1's reason, it is
Many.

The super woofer may be constructed as an independent casing and installed inside the casing of a rear-projection TV, or it may be integrated as a part of the casing of a rear-projection TV. good.

〔Example〕

An embodiment of the present invention will be shown below.

Figure w4i is a perspective view showing a rear projection television as an embodiment of the present invention.

Figure 2 is an exploded perspective view showing each mx element in the rear projection television shown in Figure 1. In FIG. 2, the rear projection television according to the present invention has a speaker enclosure of 1Ω in the center with the speaker 9 sealed on both lower sides,
A cabinet 1 having a sound emission hole 11 is located at the rear,
Screen block that projects images on the front side 2. Control panel 14. A speaker grill 15 and a front cover 8 are arranged, and a reflector block 5 for reflecting the projected light and a rear cover 6 are arranged on the fk side and are kojid. Furthermore, inside the cabinet 1 is a lens/projection projector having a built-in circuit board 5 in its lower part.

Tsuku 4 is placed, and at the upper left end there is placed a super kuhafu that plays only bass sounds.

FIG. 5 is a horizontal cross section showing the optical path of the projection light and the positional relationship of the super woofer in the rear projection type television shown in FIG. The projection light emitted from the five projection tubes 12 corresponding to the five primary colors of R, G, and H passes through a lens 157 provided corresponding to each projection tube 12, is reflected by the reflecting mirror 17, and is reflected onto the screen 16. reach. Lens 1s on both left and right ends and reflection @17
A dashed-dotted line A connecting the left and right ends of the screen 16 and the right and left ends of the screen 16 indicates the end of the effective portion of the optical path of the projected light.

Super Woofer 7 is located in a position where it does not block the effective optical path χ!
Since it has been, play it! It does not have any negative effect on the llX and only reproduces bass frequencies below 2ΩOBz, and the reproduced sound is produced through the sound emission hole 1 provided on the rear surface of the cabinet 1.
1 and is radiated to the outside.

4th Garden (1 This is a perspective view to show the positional relationship between the cabinet 1 and the supercoat in the back projection type TV shown in Figure 1. This figure is a view taken from the board surface of the cabinet 1. The super woofer 17 includes a bass speaker unit 14 and a bass reflex duct 15.

In this embodiment, the super woofer 7 is provided in the cabinet 1 and is configured to be larger than the subwoofer enclosure 10, and is designed for the bass reproduction band, so the super woofer 7 has a
It is possible to play deep bass up to about Hz, 40-200#
In charge of the z band.

On the other hand, sounds of 200 Hz or higher are emitted from the speaker 9 attached to the lower part of the cabinet 1.

The sounds emitted from the speaker 9 and the super woofer 7 are mixed and reach the viewer, resulting in a beautifully reproduced sound that can be reproduced up to the deep bass band.

FIG. 5 is a board showing another practical example of the present invention: j! ia perspective view.

FIG. 6 is a transparent perspective view of a plate surface showing still another embodiment of the present invention.

〔Effect of the invention〕

According to the present invention, it is possible to extend the bass reproduction band without removing the speaker system 7a from the outside, and it is possible to reduce the impressive reproduction quality.

Furthermore, since the dead space within the cabinet is lubricated, the cabinet itself does not become larger.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is m1
5 is a horizontal blood cut diagram of the first prisoner, FIG. 4 is a transparent perspective view of the first prisoner, and FIG. 5 is another embodiment of the present invention. FIG. 146 is a perspective view of a plate surface showing still another embodiment of the present invention. 1...Cabinet 2...Screen block 3...Reflection block 4...Lens/projection tube I:+7 5...times 1i2!1 board 6...Surrounding cover 71. ．． Super Kuha 81. ．． 7II mountain cover 9...Speaker 10...Subikaenku a 7Ya 11...Sound emission hole 12...Projection chamber 1'5.
... Lens 14 ... Bass speaker unit 15 ... Bass reflex duct 16 ... Screen 1
7... Reflexive challenge to the Germans

Claims (2)

[Claims] 1. a casing, a projection tube disposed inside the casing for emitting projection light, a lens disposed inside the casing for magnifying the projection light emitted from the projection tube; a reflecting mirror disposed inside the housing to reflect the projected light magnified by the lens; and a screen disposed on the front side of the casing to receive the projected light reflected by the reflective mirror from the back and display an image. What is claimed is: 1. A rear projection television set comprising: a rear projection television set comprising: a speaker system exclusively for bass reproduction provided in a specific space inside the housing; 2. 2. The rear projection television set according to claim 1, wherein the specific space in which the speaker system dedicated to bass reproduction is provided is a space located at a relatively upper rear part of the screen inside the casing, and A rear projection television set characterized in that the space is not used as an optical path for projection light from a projection tube to a screen via a lens and a reflecting mirror.