Electricity: power supply or regulation systems – External or operator controlled – Using an impedance as the final control device
Patent
1985-12-30
1987-08-25
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Using an impedance as the final control device
323370, H03H 100, H03H 500
Patent
active
046895507
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a method for adjusting an electronic circuit used for a television receiver or the like when it is adjusted upon being manufactured.
2. Background Art
In an electronic circuit for use in a television receiver and so on, the characteristic thereof is normally changed and adjusted by finely adjusting a magnitude of a current flowing through such circuit. In that case, it is generally carried out that the electronic circuit is set in the driving (operating) mode and under this state, by rotating a semi-fixed resistor inserted into the circuit, the voltage and the like at a necessary operation point are adjusted so as to fall within a standardized range.
According to this method, since the variation in valve of the semi-fixed resistor itself is large, even if the adjusting angle of the semi-fixed resistor is determined, the characteristics of all the electronic circuits can not always fall within the standardized values. For this reason, the rotational adjustment must be carried out in each electronic circuit, requiring a relatively long time of about 20 seconds for one adjustment. Further, since the semi-fixed resistor is of a so-called movable type, after the adjustment, the rotational angle may be changed due to the vibration, contact and so on. Accordingly, upon transportion and the like thereof, there is such a defect to pay a notice that this semi-fixed resistor is not touched, etc.
In view of the above mentioned aspect, this invention is to omit the semi-fixed resistor to thereby improve the reliability of the electronic circuit after it was adjusted and also is to simplify the adjustment itself to thereby reduce the adjusting time.
DISCLOSURE OF INVENTION
According to the present invention, a connection line, which can be melt-cut by flowing a current thereto from the outside, is connected in series or in parallel to an adjusting element inserted into a predetermined current path within an electronic circuit; under a predetermined driving state of the electronic circuit, the operation state of this electronic circuit is detected by a detector circuit; on the basis of the detected result, it is judged whether the connection line is melt-cut or not; under the necessary state, the current is supplied to the connection wire from the outside to melt-cut the same; and a semi-fixed resistor is omitted, whereby the reliability after the adjustment is improved and also the adjustment itself is simplified, thus reducing the adjusting time.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a block diagram useful for explaining an embodiment of a method for adjusting an electronic circuit according to the present invention,
FIG. 2 is a cross-sectional view illustrating an example of an element used in the present invention, and
FIGS. 3, 4, 5 and 6 are cross-sectional views illustrating main parts of other embodiments of the present invention, respectively.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a method for adjusting an electronic circuit according to the present invention will hereinafter be described with reference to the drawings.
In FIG. 1, reference numeral 1 designates a signal input terminal, 2 a preceding stage circuit, 3 a succeeding stage circuit and 4 a signal output terminal. To a DC power source such as a drive power supply source and the like in the preceding stage circuit 2, four resistors 11, 12, 13 and 14 are connected in series. The connection point between the resistors 12 and 13 is connected to a predetermined point of the preceding stage circuit 2. In that case, the resistors 12 and 13 become adjusting elements and the resistance values thereof are selected to be extremely low as compared with other resistors 11 and 14. By way of example, respective resistance values R.sub.1, R.sub.2, R.sub.3 and R.sub.4 of the resistors 11, 12, 13 and 14 are 200 K .OMEGA., 200 .OMEGA., 300 .OMEGA. and 300 K .OMEGA., respectively. An electronic circuit 10 is constructed as described above. The connection points among the respective res
REFERENCES:
patent: 3930304 (1976-01-01), Keller et al.
patent: 4016483 (1977-04-01), Rudin
patent: 4150366 (1979-04-01), Price
patent: 4201970 (1980-05-01), Onyshkevych
patent: 4412241 (1983-10-01), Nelson
Mitsuhashi Takamichi
Ueno Takehiko
Ujihara Tsunenobu
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
Wong Peter S.
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