JPH03188612A - Capacitor device for electronic circuit - Google Patents

Abstract

PURPOSE:To improve regenerated tone quality remarkably by connecting an electrolytic capacitor, in which a section between electrodes is impregnated with an electrolyte, and a solid capacitor having a solid dielectric material in parallel. CONSTITUTION:Comparatively large capacitance is acquired in an Al electrolytic capacitor in which capacitor paper rolled between Al foil electrodes is impregnated with an electrolyte, but the AL electrolytic capacitor has polarity and low Q and high-frequency characteristics are not acquired sufficiently. A solid capacitor using a porcelain sintered body having a high dielectric constant such as a BaTiO3 porcelain has a high Q and excellent high-frequency characteristics. When these capacitors are connected in parallel and employed, the increase of impedance in a high-frequency region as the whole capacitor device can be suppressed preferably as compared with an Al electrolytic capacitor single body because charge and discharge are conducted according to the properties of the solid capacitor excellent in high-frequency characteristics under a transient state in which terminal voltage is changed suddenly, thus suitably improving the tube quality of reproduced sounds, acquiring natural tone quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to electronic devices such as in an amplifier circuit for amplifying signals such as audio signals and video signals, or in a power supply circuit for supplying power to this amplifier circuit. The present invention relates to a relatively large capacity capacitor device used in a circuit.

Conventional technology and its challenges In order to improve the playback quality, speakers of audio equipment,
Various technological improvements are being made in codes, amplifier circuits, etc. However, improvements are desired in areas such as the thickness of the sound, the sharpness of the sound, and the clarity of the outline of the sound, and there is no end to the pursuit of improved playback quality.

In order to improve playback sound quality, the inventor of the present invention repeatedly produced prototypes and sound quality tests of audio equipment, especially amplification circuits called so-called amplifiers and their power supply circuits. It is surprising that connecting a ceramic capacitor in parallel with an electrolytic capacitor, which is used in places where relatively large capacitance is required, such as in power supply circuits that supply power to amplifier circuits, significantly improves the playback quality. I discovered a fact. The present invention has been made based on this knowledge.

Means for solving the problems, that is, the gist of the present invention is to provide an electrolytic capacitor in which an electrolyte is impregnated between electrodes, such as a so-called aluminum electrolytic capacitor, and a solid capacitor having a solid dielectric material, such as a so-called ceramic capacitor. This is the seventh configuration, which is constructed by connecting these in parallel.

Operation and Effect of the Invention In this way, the characteristics of an electrolytic capacitor in which an electrolyte is impregnated between the electrodes, which has a large capacitance but a small Q and insufficient high frequency characteristics, and the excellent high frequency characteristics of a solid capacitor can be improved. Since both characteristics function simultaneously, a capacitor device with relatively large capacity and excellent high frequency characteristics can be obtained at a low cost. In other words, since it is constructed by connecting an electrolytic capacitor and a solid capacitor in parallel, in a transient state where the terminal voltage fluctuates rapidly, charging and discharging takes place according to the properties of the solid capacitor, which has excellent high frequency characteristics, and the capacitor As a whole, the increase in impedance of the device is suppressed more favorably than with a single electrolytic capacitor, and the reproduced sound quality is significantly improved. Further, the present invention not only significantly improves sound quality, but also significantly improves reproduced images by being applied to video signal amplifier circuits and their power supply circuits.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a cross section of the signal transmission cable 10, and FIG. 2 shows an example of how the signal transmission cable 10 is used. In the figure, a pair of signal transmission core wires 12a and 12b are provided in parallel with each other.
The inner circumferential covered conductors 16a and 16b are electrically floating, and the inner circumferential covered conductors 16a and 16b are respectively covered via outer circumferential insulating layers 18a and 18b, Outer circumferential coated conductors 20a and 20b that are electrically floating;
A resin outer skin 21 is provided. Note that the inner coated conductors 16a and 16b and the outer coated conductors 20a and 20b are made of mesh wires made of a large number of thin copper wires or aluminum wires woven into a cylindrical shape. Metals with high magnetic permeability such as permalloy, nickel-based or iron-based alloys, and amorphous metal materials thereof may also be used. In this case, sufficient sound quality can be obtained even if the outer peripheral covered conductors 20a and 20b are removed.

In FIG. 2, the signal transmission line 12a of the signal transmission cable 10 is connected between the voice coil 24 of the speaker 22 and the secondary coil 28 of the output transformer of the main amplifier 26.
and 12b, so that the output signal of the main amplifier 26 is transmitted to the speaker 22 via the signal transmission fibers 12a and 12b. Above speaker 2
No. 2 is equipped with a speaker cone having extremely high rigidity by plating a resin cone body having reinforcing ribs arranged radially. for example,
Patent No. 1064963 filed and registered by the applicant
No. (Special Publication No. 56-7358) and Patent No. 10649
This is the speaker described in No. 75 (Japanese Patent Publication No. 56-7359).

The main amplifier 26 is constructed as shown in FIG. In the figure, a signal input to the input transformer 30 from a player, microphone, etc. (not shown) is amplified in the front-stage amplifier section 34 and the rear-stage amplifier section 36 which are transformer-coupled to each other via the coupling transformer 32, and then from the output transformer 28. Output. The front stage amplifying section 34 is composed of two vacuum tubes (6MH3, for example) 38 which are cascode coupled, and the rear stage amplifying section 36 is composed of two vacuum tubes (6MH3, for example) which are cascode coupled.
For example, it is composed of 6CA7)40. The broken line in FIG. 3 indicates a portion of the main amplifier 26 that is covered with a floating coated conductor similarly to the signal transmission cable 10. Furthermore, although the main amplifier 26 described above has excellent characteristics in the high range of audible frequencies,
The sound quality is further improved by providing a capacitor device 48 consisting of an aluminum electrolytic capacitor 44 and a ceramic capacitor 46 connected in parallel. The location where this capacitor device 44 is installed is the location where only the aluminum electrolytic capacitor 44 was conventionally installed.

The aluminum electrolytic capacitor 44 has a capacitance of, for example, several μF to more than 100 μF, as required, and the ceramic capacitor 46 has a capacitance of, for example, 0.12 μF to 0.47 μF.

The container for the ceramic capacitor 46 is selected to have a size commensurate with its load.

The aluminum electrolytic capacitor 44 is well known and is constructed by, for example, impregnating capacitor paper wrapped between aluminum foil electrodes with an electrolyte. Usually, a viscous electrolyte prepared by mixing antimony borate with ethylene glycol or glycerin is used. The aluminum electrolytic capacitor 44 constructed by impregnating the electrodes with an electrolyte has a relatively large capacitance, but in addition to having polarity,
Since the battery voltage is low and sufficient high frequency characteristics cannot be obtained, the battery is generally placed in an electronic circuit at a location where it can function isometrically as a direct current battery. The ceramic capacitor 46 is also well known and is constructed using a ceramic sintered body having a high dielectric constant, such as barium titanate ceramic, as a dielectric material. Solid capacitors having such solid dielectric materials generally have a high Q and high high frequency characteristics.

The sound reproduced from the speaker 22 by the signal amplified by the main amplifier 26 configured as described above is significantly improved over the entire frequency range compared to the case where the magnetic capacitor 46 is not provided. , much better natural sound quality in terms of sound clarity and sound contour.

This is presumed to be due to the following reasons.

That is, in the capacitor device 48 in which an aluminum electrolytic capacitor 44 and a magnetic capacitor 46 are connected in parallel, the aluminum electrolytic capacitor 44 has a large capacitance, and the magnetic capacitor has a small internal resistance and excellent high frequency characteristics. 46 functions at the same time, in a transient state where the terminal voltage fluctuates rapidly, charging and discharging is performed according to the properties of solid capacitors with excellent high frequency characteristics, and the impedance of the entire capacitor device increases in the high frequency range. Compared to the aluminum electrolytic capacitor 44 alone, it is suppressed more favorably and the reproduced sound quality is improved. In other words, each electrolytic capacitor 44, which has not received attention because it is not related to sound quality,
However, by connecting ceramic capacitors 46 with low impedance in parallel for the purpose of lowering the impedance of that part, the impedance of the capacitor device 48 as a whole is made low, so that the sound quality as a whole is suitably improved. This is thought to be the case.

We will have to wait for future research to determine whether or not the above speculation is valid, but it has been confirmed by those who witnessed the inventor's experiments that the actual sound quality is significantly improved. There is. It should be noted that the effect of transmitting an audio signal using the signal transmission cable 10 is that the speaker 2 is equipped with a speaker cone configured with extremely high rigidity.
Not only is it easy to recognize when the sound is output from 2, but also when the sound is output from a normal speaker equipped with a relatively soft paper cone.
The effect of providing the capacitor device 48 within the main amplifier 26 is easily recognized.

The capacitor device 48 may be provided not only in the main amplifier 26 but also in place of an electrolytic capacitor in a constant voltage power supply circuit that supplies DC power to the main amplifier 26.
Improvement in sound quality is recognized.

Moreover, even if the capacitor device 4 is installed in place of an electrolytic capacitor in an amplifier circuit that amplifies a video signal, it has the effect of improving the video image. That is, in experiments conducted by the present inventor, when the capacitor device 48 is used in place of an electrolytic capacitor in an amplifier or power supply for not only a CD device but also an FM device, tape recorder, AV device, and television receiver, the electrolytic capacitor It has been confirmed that not only the sound quality but also the image quality is significantly improved compared to the case where only

Note that instead of the ceramic capacitor 46, a high-Q solid capacitor that is currently available or will be available in the future, such as a mica capacitor or a plastic film capacitor with excellent high frequency characteristics, may be used.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a signal transmission cable according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a connection state of the embodiment of FIG. 1. FIG. 3 is a circuit diagram illustrating the configuration of the 20th main amplifier. Figure 1 Nialuminum electrolytic capacitor Two magnetic capacitors: Capacitor device

Claims (1)

[Claims] 1. A capacitor device for an electronic circuit, comprising an electrolytic capacitor having an electrolyte impregnated between electrodes and a solid capacitor having a solid dielectric material connected in parallel.