JPS60191599A - Speaker for television receiver - Google Patents

Abstract

PURPOSE:To obtain a speaker realizing a compact television set while expanding a low frequency reproduction limit by providing a slit between a cathode ray tube and a cabinet so as to eliminate a pneumatic pressure rise at the back of a front panel. CONSTITUTION:A drive force is delivered to a front panel 3 in response to an electric signal applied to a driving driver 4. The pneumatic pressure of air formed by a panel 3, a cathode ray tube 2 and a cabinet 1 rises at a low frequency range by the vibration of the panel 3. Since the four corners of the cathode ray tube 2 is supported to the cabinet 1 via a specer 19, the four upper/ lower/right/left sides constitute a slit with the cabinet 1. Thus, even if the sound pressure rises, the air flows to the back side of the cathode ray tube 2 through the slit. Then it is possible to eliminate the reduction in the air compliance being a cause to the rise in the minimum resonance frequency deciding the limit of low frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a television speaker used in a television set.

Conventional configurations and their problems In recent years, the shapes of audio equipment such as televisions and cassette recorders with radios have become significantly more compact.

Here, we will focus on television sets and discuss their problems.One of the factors that hinders miniaturization is the shape of the speakers. To solve this problem, some measures have been taken, such as installing a system speaker equipped with a rectangular speaker with a good base factor on the side of the set.

However, even if the speaker shape is rectangular, space for the speaker chamber is required in the front of the set, so there is a limit to the combination of speakers. In addition, if the speaker is attached to the side of the set, the speaker has a directional sound pressure characteristic, so the sound pressure in the high range will drop significantly in the front of the speaker, which is off the front axis of the speaker. However, there was a problem that the sound quality deteriorated. Furthermore, the method of attaching the speakers to the sides has the disadvantage that if there are obstacles on the sides, it becomes difficult to reproduce sound, and the installation location of the set is limited.

In order to solve these problems, a reproduction method was devised in which a driver is attached to the front panel of the cathode ray tube making up the set and the front panel is vibrated to use the Freon 1 panel as a diaphragm.

A conventional speaker of this type will be explained below.

Figure 1 is a perspective view of a television set that uses this type of speaker, with 1 being a cabinet, 2 being a cathode ray tube,
3 is a front panel made of a material with high light transmittance such as glass or transparent acrylic attached to the front of the cathode ray tube 2, and 4 is Freon!・This is an electromagnetic type drive driver attached to the back of the panel 3.

FIG. 2 shows a structural diagram of the above-mentioned driving driver, and FIG. 2(a) is a partially cutaway top view of the same, and FIG. 2(a) is a sectional view of the same structure. In Fig. 2, 5 is an excitation coil wound around a center bow/L/115 which is integrally or mechanically connected to plate 6, and 8 is an excitation coil arranged on plate 6. These permanent magnets constitute an excitation section.

Reference numeral 9 indicates an outer peripheral cover made of a non-magnetic material that is fixed to the bottom surface of the plate 6 and surrounds the outer periphery of the permanent magnet 8. Reference numeral 10 indicates a diaphragm made of a ferromagnetic material such as soft iron. It is fixed to the component 13 with screws 14. Also, the outer periphery of the suspension 12 is provided with a spacer 1.
The diaphragm 12 is fixed to the upper surface of the outer circumferential cover 9 by screws 16 via the diaphragm 5, and the diaphragm 12 is arranged with a predetermined gap between it and the excitation section.

Vibration component 13 of the drive driver composed of the above components
The upper surface of is firmly fixed to the front panel 3 of the TV set 1' shown in FIG. 1 with adhesive or the like.

The operation of the TV Nubika configured using the conventional drive driver 4 configured as described above will be described below.

The speakers of the above method are installed on the front spring of the TV set.
Attach an electromagnetic driver to L/3, and use this driving force to
The front panel 3 is vibrated to reproduce sound. That is, the magnetic force acting on the diaphragm 10 held by the suspension 12 changes in response to the signal current flowing through the excitation coil γ, and a driving force is generated on the diaphragm 10 by this magnetic force.

The driving force generated in the diaphragm 10 is transmitted to the oscillating component 13 via the spacer 11 provided on the top of the diaphragm 10, causing the front panel 3 to vibrate.

Since it is a front panel, it has a wide vibration area and can efficiently convert the driving force of the electromagnetic driver into acoustic output.

However, in conventional television sets, the CRT 2 and the cabinet 1 were designed to be in close contact with each other at their respective contact surfaces, so the front spring/L'3
The empty space formed by the cabinet 1 and the cathode ray tube 2 was almost hermetically sealed. As mentioned above, the wooden sword type speaker uses the driver 4 to vibrate the front panel 3 to reproduce sound.
The bass characteristics are greatly affected by the volume of the empty chamber. That is, for the front spring zLz3, which operates as a diaphragm, the empty chamber acts as an air spring. Therefore, if the volume is small, bass reproduction becomes difficult. To explain this state in detail, the lowest resonant frequency f of the speaker determines the bass reproduction limit. is expressed by the following equation (1).

In Equation (1), ■...The vibration system quality of the speaker C...
... Compliance of the support system of the speaker Further, the compliance of the support system can be expressed as the sum of the compliance Cs of the vibration system and the air compliance CB exhibited by the empty room. Furthermore, the air compliance C, is expressed by the following formula (2
).

C-□ ・ ・ ・ ・ (2) B ρG 232 In equation (2), WB ... Volume of empty chamber ρ0 ... Density of air C ... Sound speed of air S - Expressed as area of diaphragm It will be done. If we compare it with the general Nupica system, the speaker of this system has a front panel 3 that covers the front of the speaker as a diaphragm. Compliance CB is very small9, CB <':' S
So, in the end it was f. is determined by the vibration system mass M and the small air compliance CB, and the speaker lacks bass.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a television speaker that realizes a compact television set with an expanded bass reproduction limit.

Components of the Invention The present invention relates to a vacant space comprising a front panel made of glass or transparent acrylic placed in front of a cathode ray tube, and a television center cabinet 1- to which the front panel and the Bellaran tube are attached. A hole or slot for ventilation between the empty space provided in the section and the empty space on the back of the cathode ray tube. This is a front panel driven television speaker equipped with a hole such as a hole, and the hole made in a part of the empty room is used to explain the front panel embodiment in the bass range. FIG. 3 shows a partial sectional view of a TV station using TV speakers according to the first embodiment of the present invention. In FIG. 3, 17 supports the outer periphery of the front panel 3,
4 is a drive driver fixed to V3 (front spring); 18 is a stopper provided at the four corners of the cathode ray tube 2; The cathode ray tube 2 is firmly held in the cabinet 1 by bolts 20.

The operation of the television speaker of this embodiment configured as described above will be described below.

In response to the electric signal applied to the drive driver 4, the driving force is transmitted to the front panel 1-panel 3. Due to the vibration of the front spring (V3), the air pressure in the chamber formed by the front panel 1-panel 3, cathode ray tube 2, and cabinet sound 1-1 increases in the bass range. However, CRT 2
The four corners are held by the gear vignette 1 via spacers 19, and the four sides, top, bottom, left and right, constitute a front between them and the gear vignette 1. Therefore. Even if the sound pressure rises, air flows through the aperture 1- to the back of the cathode ray tube 2, as shown by the arrow.

As described above, in this embodiment, the front constructed on the four sides of the cathode ray tube 2 can eliminate the increase in air pressure in the rear chamber of the front panel 3, so the lowest resonance frequency that determines the bass limit can be eliminated. It becomes possible to eliminate the decrease in the non-circular ``r'' of 1-anatomical compensation Iance CB of f.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 4 shows a front view of a TV station showing a second embodiment of the present invention.

In FIG. 4, the same members as in FIGS. 1 and 3 are designated by the same numbers and their explanations will be omitted. What differs from the configuration in FIG. 3 in FIG. J Sol-21 is provided around the front of the cabinet.

In this embodiment configured as above, the front panel 3
This eliminates the increase in air pressure in the rear chamber by passing air through the front 21 and the back of the cathode ray tube 2. SD, it is possible to eliminate the depression of the cathode ray tube 2 from the front surface of the cabinet 1 due to the spacer 19 that occurs in the first embodiment.

Note that the driving driver 4 may be of an electromagnetic type, an electrodynamic type, or a piezoelectric type.

Effects of the Invention The present invention provides a slit between the cathode ray tube and the gear vignette, or a plurality of slits around the front of the cabinet to eliminate the increase in air pressure at the rear of the panel. It is possible to realize a compact television set that uses a front panel speaker that expands the reproduction limit, and the effect is that two people can use it.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a television set with conventional front panel driven speakers, and Figure 2 (a) is a front panel drive type speaker.
A partially cutaway top view of a driving driver for driving a panel, FIG. 2(b) is a sectional view of the same structure, and FIG. 3 is a portion of a television set using television speakers in the first embodiment of the present invention. The sectional view and FIG. 4 are perspective views of a television set using television speakers in the second embodiment. 1...cabinet, 2...cathode ray tube, 3
...Front panel, 4...Driver, 19...Nuvesa, 21...Slit.

Claims (3)

[Claims] (1) A front panel made of glass or transparent acrylic placed in front of a cathode ray tube, and a part of an empty room consisting of a television set cabinet to which the front panel and the cathode ray tube are attached. 2. A television speaker comprising: an opening such as a hole or a slit for ventilating the empty space and the empty space on the back side of the cathode ray tube; and the front panel is driven by a driver. (2) A television speaker according to claim 1, wherein a plurality of Nuvenas are inserted between a cabinet of a television set and a cathode ray tube, and a slit is formed between the Nuvenas for installation. (3) TV center cabinet on the back of the front panel (
4) The television speaker according to claim 1, wherein the driving driver is of an electromagnetic type, an electrodynamic type, or a piezoelectric type.