Detachable speaker for a TV receiver

Abstract: A speaker (10) for a television receiver having a speaker unit disposed within a housing detachable from a television receiver body (1) comprises tweeter speaker units (11, 12) disposed on different two planes (10a, 10b) of the housing to reproduce a sound of a high frequency component, and a woofer speaker unit (13) disposed on one (10a) of the two planes (10a, 10b) to reproduce a sound of a low frequency component.

Description: BACKGROUND OF THE INVENTION Field of the Invention: The present invention generally relates to electric apparatus having a speaker and, more particularly, is directed to a speaker for a television receiver. Description of the Related Art: Television receivers having speakers integrally incorporated therein are now commercially available on the market. It is customary that, when the viewer watches a television broadcast program with a television receiver, the viewer watches the television broadcast program with a sound reproduced from the incorporated speaker. In this case, a small speaker unit is housed within the television receiver so that a sound with relatively high tone quality can be reproduced. Recently, it is requested to reproduce a sound with excellent tone quality when the viewer watches a television broadcast program or video program reproduced from a video tape. Therefore, there is a trend that television receivers incorporate large speakers therein. It is natural that the television receiver having the large speaker becomes large in size and needs a large space to set. If there is a little space to spare to install the television receiver, then it is considered that a television receiver is combined with a separate large speaker apparatus. In that case, the speaker housed within the television receiver becomes useless. JP-A-62281698, discloses a device having speaker boxes which are freely attachable and detachable from the device. The speaker box comprises a woofer and two tweeters which are provided on the front side of the speaker box. The two tweeters are provided in the front side while they are tilted and fitted so that the speaker box can point them in different directions. EP-A-0 372 186 discloses a speaker box for a television receiver wherein the speaker box is detachable from the television receiver. OBJECTS AND SUMMARY OF THE INVENTION Therefore, it is a general object of the present invention to provide an improved speaker for a television receiver in which the aforesaid shortcomings and disadvantages encountered with the prior art can be eliminated. More specifically, it is an object of the present invention to provide a speaker for a television receiver in which a sound can be reproduced with excellent tone quality. It is another object of the present invention to provide a speaker for a television receiver which can be disposed in a small space when attached to a television receiver. According to an aspect of the present invention, there is provided a speaker for television receiver having a speaker unit disposed within a housing detachable from a television receiver body which comprises tweeter speaker units disposed on different two planes of the housing to reproduce a sound of a high frequency component, and a woofer speaker unit disposed on one of the two planes in which the tweeter speaker units are disposed to reproduce a sound of a low frequency component. According to another aspect of the present invention, there is provided a television receiver which comprises a speaker detachably attached thereto, the speaker having speaker units disposed on two planes to reproduce a sound of a high frequency component and a speaker unit disposed on one plane of the two planes on which the speaker units to reproduce the sound of a high frequency component are disposed to reproduce a sound of a low frequency component, wherein the speaker is disposed such that the plane on which the speaker units that can reproduce a sound of a high frequency component are placed is faced to the front. The above and other objects, features, and advantages of the present invention will become apparent from the following detailed description of an illustrative embodiment thereof to be read in conjunction with the accompanying drawings, in which like reference numerals are used to identify the same or similar parts in the several views. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a speaker for a television receiver according to an embodiment of the present invention; FIG. 2 is a perspective view showing the condition that the speaker according to the embodiment of the present invention is removed from the television receiver; FIG. 3 is a perspective view showing the speaker according to the embodiment of the present invention in an enlarged scale; FIG. 4 is a front view showing a first example that the speaker according to the embodiment of the present invention is disposed; FIG. 5 is a front view showing a second example that the speaker according to the embodiment of the present invention is disposed; and FIG. 6 is a front view showing a third example that the speaker according to the embodiment of the present invention is put in position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A speaker for a television receiver according to an embodiment of the present invention will hereinafter be described with reference to the drawings. FIG. 1 of the accompanying drawings is a perspective view and showing the condition that a speaker apparatus according to the embodiment of the present invention is attached to the television receiver. As shown in FIG. 1, a television receiver body that is generally depicted by reference numeral 1 includes on its front wall an image display portion 2 formed of a cathode ray tube (CRT). Separate speaker apparatus 10L, 10R are respectively attached to left and right side walls of the television receiver body 1. In this case, the television receiver body 1 does not incorporate therein a speaker. As shown in FIG. 2, left and right side walls 3L, 3R of the television receiver body 1 include hooks 4 attached thereto and the left and right speaker apparatus 10L, 10R are fixed to the left and right side walls 3L, 3R of the television receiver body 1 by fitting the hooks 4 into apertures 15 bored through the rear walls of the speaker apparatus 10L, 10R. As shown in FIG. 2, on the rear walls of the respective speaker apparatus 10L, 10R are attached terminal units 16. The terminal units 16 are connected to speaker connection terminals (not shown) of the television receiver body 1 via speaker cords 7. In the example shown in FIG. 1, the television receiver body 1 is placed on a television receiver rack 6. According to this embodiment, the left and right speaker apparatus 10L, 10R are formed of thin box-shaped housings, respectively. Tweeters 11L, 11R that are speaker units to reproduce the sound of a high frequency component are disposed on the upper portions of planes of the housings that construct the left and right side walls when the left and right speaker apparatus 10L, 10R are secured to the left and right side walls 3L, 3R of the television receiver body 1 (under the state shown in FIG. 1). The planes will hereinafter be referred to as first planes 10a. Tweeters 12L, 12R that are speaker units to reproduce the sound of a high frequency component are disposed on the lower portions of planes that become front walls when the left and right speaker apparatus 10L, 10R are secured to the left and right side walls 3L, 3R of the television receiver body 1. The planes will hereinafter be referred to as second planes 10b. The tweeters 11l, 11R on the first planes 10a and the tweeters 12L, 12R on the second planes 10b are speaker units which are the same in size and frequency characteristic to reproduce the sound of a high frequency component, for example, 300 Hz or more. Therefore, the sounds of the same frequency characteristic are simultaneously reproduced from the tweeters 11L, 11R of the first planes 10a and the tweeters 12L, 12R of the second planes 10b. Woofers 13L, 13R that are speaker units to reproduce the sound of a low frequency component are disposed on the lower portions of the first planes 10a. The woofers 13L, 13R are formed of speaker units having relatively large diameters to reproduce the sound of a low frequency component, for example, less than 300 Hz. In this case, the woofers 13L, 13R are arranged as so-called bass-reflex speakers to reproduce the sound of a low frequency component. More specifically, through the upper portions of the second planes 10b of the speaker apparatus 10L, 10R are bored through-holes (i.e., ports) 14L, 14R to discharge air within the speaker cabinets to the outside. As shown in FIG. 3, ducts 17 of a predetermined length are connected to the ports 14L, 14R. Since the ducts 17 are connected to the ports 14L, 14R, the woofers 13L, 13R functions as the bass-reflex speakers in which a phase of the sound output from the rear walls of the woofers 13L, 13R are inverted and radiated from the ports 14L, 14R to thereby reproduce the sound of a low frequency component with increased efficiency. On the first and second planes 10a, 10b of the left and right speaker apparatus 10L, 10R are located protecting members called saran nets or the like. Therefore, the speaker units and the ducts shown in FIG. 3 or the like are covered with the protecting members in actual practice and cannot be directly seen from the outside. In this embodiment, the diameters of the ports 14L, 14R and the diameters of the tweeters 12L, 12R are made substantially equal. Therefore, under the condition that the ducts 17 and the tweeters 12L, 12R are not attached to the housings that construct the speaker cabinets, two through-holes (duct attaching apertures and tweeter attaching apertures) of the same diameter are opened on the second planes 10b of the speaker cabinets. With this arrangement, the speaker cabinet that constructs the speaker apparatus can be made common to the left and right speaker apparatus 10L, 10R. How to put the speaker apparatus 10L, 10R of this embodiment in position will be described below. From a standard arrangement standpoint, the speaker apparatus 10L, 10R are directly fixed to the left and right side walls of the television receiver body 1 as shown in FIG. 1. In that case, the image display portion 2 of the television receiver body 1 and the second planes 10b of the left and right speaker apparatus 10L, 10R are aligned so that, while facing the image display portion 2, the viewer is within a range to receive the sound of a high frequency component reproduced from the tweeters 12L, 12R attached to the second planes 10b. Therefore, the sounds reproduced from the left and right speaker apparatus 10L, 10R reach the viewer satisfactorily and thus a sound with excellent presence can be reproduced by a stereo reproduction system, for example. The sound of a low frequency component reproduced by the left and right woofers 13L, 13R has weak directivity so that, even when the left and right woofers 13L, 13R are attached to the side walls of the television receiver body 1, the viewer who faces the image display portion 2 can hear the sound of a low frequency component well. Thus, the viewer can hear a reproduced sound over the whole frequency range in a well-balanced condition. In the arrangement shown in FIG. 1, since the second planes 10b of short width face the front, the width of the whole television receiver including the speakers can be reduced and the television receiver can therefore be installed in the small space. Further, since the sizes of the woofers 13L, 13R that can be disposed in the respective speaker apparatus 10L, 10R are not influenced by the widths (i.e., widths of the second planes 10b) of the speaker apparatus 10L, 10R, the woofers 13L, 13R having large diameters can be installed to reproduce the sound of low frequency component with impressive tone quality. How to put the speak apparatus 10L, 10R of this embodiment in position when the speaker apparatus 10L, 10R are removed from the television receiver body 1 will be described. In this case, the speaker apparatus 10L, 10R may be disposed as, for example, shown in FIG. 4. More specifically, the respective speaker apparatus 10L, 10R are removed from the television receiver body 1 and then the speaker cords that connect the speaker connection terminals of the television receiver body 1 and the terminal units 16 of the respective speaker apparatus 10L, 10R are oppositely connected right and left (speaker cords 7 are not shown in FIG. 4), i.e., a right channel audio signal is supplied to the left speaker apparatus 10L and a left channel audio signal is supplied to the right speaker apparatus 10R. The left speaker apparatus 10L is fixed to the rear right wall surface relative to the television receiver body 1, and the right speaker apparatus 10L is fixed to the rear left wall surface relative to the television receiver body 1. At that time, the speaker apparatus 10L, 10R are disposed such that the first planes 10a of the respective speaker apparatus 10L, 10R face the front. Also, the television receiver body 1 is set on a television receiver rack 6' of a proper size. In this case, the left and right direction is referred to as the direction seen by the viewer facing the image display unit 2 of the television receiver body 1. With the above-mentioned arrangement, the first planes 10a face the front so that, while facing the image display portion 2, the viewer is within a range to receive the sound of high frequency component reproduced from the tweeters 11L, 11R attached to the first planes 10a. Therefore, also in this case, the viewer can hear the sound reproduced from the left and right speaker apparatus 10L, 10R over the whole frequency range in a well-balanced fashion. Consequently, the sound with excellent presence can be reproduced, for example, by the stereo reproduction system. Further, in this embodiment, since the left and right speaker apparatus 10L, 10R are disposed oppositely right and left, the second planes 10b of the respective speaker apparatus 10R, 10L face the outside distant from the television receiver body 1, whereby the sound reproduced from the tweeters 12L, 12R disposed on the second planes 10b of the two speaker apparatus 10R, 10L is emanated with spacial impression right and left. Thus, a stereo sound with excellent spacial impression can be reproduced. When the speaker apparatus 10L, 10R are disposed as shown in FIG. 4, the following variants are also possible. That is to say, the respective speaker apparatus 10L, 10R are not fixed to the wall surface and may be disposed on predetermined speaker racks 8L, 8R as shown in FIG. 5. When the respective speaker apparatus 10L, 10R are fixed to the wall surface, as shown in FIG. 6, the left and right speaker apparatus 10L, 10R may be disposed at the positions in the regular direction (i.e., the right speaker apparatus 10R is disposed at the rear right side of the television receiver 1 and the left speaker apparatus 10L is disposed at the rear left side of the television receiver 1). In this case, the speaker connection terminals of the television receiver body 1 and the terminal units 16 of the respective speaker apparatus 10L, 10R are connected together by the speaker cords 7 in the regular direction. Thus, the second planes 10b of the speaker apparatus 10L, 10R face the television receiver 1 side so that a sound reproduced from the tweeters 12L, 12R disposed on the second planes 10b is transmitted to the television receiver 1 side. Therefore, a reproduced sound of a relatively high frequency component is concentrated on the picture screen of the television receiver 1 and a sound image of a relatively high frequency component is concentrated on the center side, thereby carrying out the reproduction such that a sound image localization is concentrated on the picture screen. It is frequently observed that some video program to be viewed is reproduced more satisfactorily under such condition. When the speaker apparatus 10L, 10R of this embodiment that are combined with the television receiver body 1 are directly attached to the television receiver body 1, the sound can be satisfactorily reproduced in the small space. When the speaker apparatus 10L, 10R are removed from the television receiver body 1 and then disposed as described above, the sound can be reproduced with desired stereo tone quality in response to the positions at which the speakers 10L, 10R are disposed. In any case, the sound can be reproduced satisfactorily. While the structure for detachably attaching the respective speaker apparatus 10L, 10R to the television receiver body 1 has been described so far by way of example, the present invention is not limited thereto and a variety of connection structures can of course be applied to the present invention. Further, while the sound of a low frequency component is reproduced by the woofers 13L, 13R of bass-reflex type as described above, the present invention is not limited thereto and woofers of enclosure type having no ducts provided therein may be applied to the present invention. In general, bass-reflex type woofers can reproduce the sound of a low frequency component with excellent efficiency even in small speaker cabinets. While the speaker apparatus of the present invention is a two-way speaker system formed of tweeter and woofer as described above, the present invention is not limited thereto and a three-way speaker system or a speaker having three frequency bands or more may be applied to the present invention. According to the present invention, the plane in which the speaker unit that can reproduce the sound of a high frequency component is disposed is reduced in width in the lateral direction. If this narrow plane faces the front and the speaker units are aligned with the television receiver, then the width that the speakers are projected laterally from the television receiver can be reduced. Also, the speaker unit that can reproduce a sound of whole frequency range is disposed on the plane in which the speaker unit that can reproduce a sound of low frequency component is disposed together with the speaker unit that can reproduce a sound of high frequency component. Therefore, if the speaker units are removed from the television receiver and disposed in a desired place under the condition that this plane faces the front, then the sound can be reproduced with stereo tone quality matched with an image. In this case, the two speaker units that can reproduce the sound of high frequency component have substantially the same frequency characteristics so that, even when the plane to which any one speaker unit that can reproduce the sound of high frequency component is attached is faced to the front, the sound can be reproduced with substantially the same frequency characteristics. Since the ports required by the bass-reflex speaker is disposed on the plane in which only the speaker unit that can reproduce the sound of high frequency component is disposed, the vacant space of this plane can be utilized effectively.

Claims: A speaker (10) for a television receiver having a speaker unit disposed within a housing detachable from a television receiver body (1), characterized by: two tweeter speaker units (11, 12) disposed on different two planes (10a, 10b) of said housing to reproduce a sound of a high frequency component; and a woofer speaker unit (13) disposed on a first one (10a) of said two planes (10a, 10b) in which said tweeter speaker units (11, 12) are disposed to reproduce a sound of a low frequency component, wherein a second one (10b) of said planes faces to the front when the speaker (10) is used attached to the television receiver body (1), and the first plane (10a) faces to the front when the speaker (10) is used separately from the television receiver body (1). A speaker (10) for a television receiver according to claim 1, wherein said two tweeter speaker units (11, 12) disposed on said two planes (10a, 10b) have substantially the same frequency characteristics. A speaker (10) for a television receiver according to claim 1, wherein said woofer speaker unit (13) and said housing constitute a bass-reflex type speaker and a port (14) required by said bass-reflex type speaker is disposed on the other (10b) plane of said two planes (10a, 10b). A television receiver comprising a speaker (10) detachably attached thereto, characterized in that said speaker (10) has speaker units (11, 12) disposed on two different planes (10a, 10b) to reproduce the sound of a high frequency component and a speaker unit (13) disposed on a first plane (10a) of said two different planes (10a, 10b) to reproduce the sound of a low frequency component, wherein said speaker (10) is disposed such that one of the planes on which said speaker units (11, 12) that can reproduce a sound of a high frequency component are placed is faced to the front, wherein a second plane (10b) of the two different planes (10a, 10b) faces to the front when the speaker (10) is used attached to the television receiver, and the first plane (10a) faces to the front when the speaker (10) is used separately from the television receiver.

Inventors: KOIZUMI HIROSHI, KOIZUMI, HIROSHI, KOIZUMI, HIROSHI, C/O SONY CORPORATION
Applicants: SONY CORP, SONY CORPORATION
Application year: 1993
Main classification: H04N5
IPC codes: H04R5, H04N5, H04R1