JP2003031430A - Small fly-back transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small fly-back transformer electrically connected without bending work and overhead wiring of lead wires of electric components, thereby improving the workability. SOLUTION: At least, using a plurality of circuit boards and utilizing patterns formed on the circuit bards, a diode, a capacitor and an anode lead are connected to form a high voltage rectifier on one circuit board, and a diode and a capacitor are connected similarly on the other circuit board to form a low voltage rectifier. A transformer is disposed and sandwiched between the circuit boards constituting the high and low voltage rectifiers, and the respective circuit boards are electrically connected through electric components such as voltage divider resistors, etc., to form a small fly-back transformer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small flyback transformer used for video equipment such as a viewfinder used for a video camera.

[0002]

2. Description of the Related Art FIG. 1 is a sectional view of a conventional small flyback transformer. As shown in FIG. 1, a conventional small flyback transformer has a diode 3, a capacitor 4, and an anode lead 5 around a transformer section in which a core 2 is incorporated in a bobbin 1 around which a high voltage coil and a low voltage coil are wound.
High-voltage rectification unit composed of a resistor 10a, diode 10
b, a low-voltage rectifying unit composed of a capacitor 10c and a voltage dividing resistor 6 are attached, this is put in an insulating case 7, and a shield case 8 is covered.

In the low-voltage rectifying section, a resistor 10a,
It is composed of electric components such as the diode 10b and the capacitor 10c, but as a means for connecting the individual electric components, the lead wire of each component is processed by bending or the like, and the lead wire is connected in the air to form a connection portion. It was soldered and electrically connected.

Further, since the high-voltage rectifying section is usually arranged above the transformer section and the low-voltage rectifying section, a partition for fixing or holding the diode 3, the capacitor 4, the anode lead 5, etc. used in the high-voltage rectifying section. By using the table 9, the transformer section, the low-voltage rectification section, the partition table, and the high-voltage rectification section are stacked in this order.

[0005]

Since the lead wires of each electric component are bent or otherwise processed for wiring in the air, there is a problem due to mechanical stress applied to the electric component main body during the bending process and the bending position. However, there are variations due to the above-mentioned variation and the way of the aerial wiring, and the complexity of the aerial wiring of the lead wire and the position of the electric parts cannot be determined, so that it takes time to assemble. In addition, there is a problem that there is a high risk of short-circuit failure due to contact of lead wires of each electric component inside. There is a method of covering the lead wire with an insulating tube, etc.
There is a problem in that it takes time and labor and the man-hours are significantly increased.

Since the flyback transformer used for video equipment such as a viewfinder is carried and used, it is required to reduce the size and height of the product. In order to dispose the high-voltage rectification unit in the above, it is necessary to provide a partitioning table capable of fixing or holding the electric components forming the high-voltage rectification circuit unit, which has been an obstacle to height reduction.

[0007]

[Means for Solving the Problem] A transformer section in which a core is incorporated in a wound bobbin, a diode, a capacitor,
A small flyback transformer including a high-voltage rectification unit including electrical components such as an anode lead, a low-voltage rectification unit including electrical components such as a diode and a capacitor, and electrical components such as a voltage dividing resistor. Using the circuit board of the above, connect the diode, capacitor, and anode lead using the pattern wired to the circuit board to configure the high-voltage rectifier on one circuit board, and similarly, on the other circuit board, the diode , A low-voltage rectification unit is configured by connecting a capacitor, and the transformer unit is arranged so as to be sandwiched between the circuit board that configures the high-voltage rectification unit and the circuit board that configures the low-voltage rectification unit. It is a small flyback transformer that is electrically connected by electrical components such as voltage divider resistors.

The transformer section is a small flyback transformer mounted on one of the circuit board forming the high voltage rectifying section and the circuit board forming the low voltage rectifying section.

[0009]

2 is a sectional view of a small flyback transformer according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view thereof. A transformer section in which a core 12 is incorporated in a bobbin 11 around which a high voltage coil and a low voltage coil are wound, a high voltage rectification section composed of a diode 13, a capacitor 14, an anode lead 15 and a high voltage rectification section substrate 19, and a diode 21, Capacitor (not shown), low-voltage rectifier substrate 2
It is installed so as to be sandwiched by the low-voltage rectification unit configured by 0, the transformer unit is mounted on the low-voltage rectification unit substrate 20, and the voltage dividing resistor 16 and the jumper lead ( The upper and lower circuit boards are electrically connected by soldering (not shown), and this is put in an insulating case 17 and covered with a shield case 18.

Further, the circuit board is provided with a notched hole portion 20a, and electric parts such as the diode 21 are arranged therein so as not to hinder the mounting of the transformer portion, thereby keeping the finished dimension low. .

[0011]

EFFECTS OF THE INVENTION By soldering the electric parts to the two circuit boards, there is no need to bend the lead wires of the electric parts, so that no mechanical stress is applied to the electric part body. By performing electrical connection using the circuit board, the aerial wiring due to the bent lead wire is eliminated, so that the occurrence of short circuit failure due to contact of the lead wire can be suppressed and the reliability can be improved. Further, since it is not necessary to perform complicated aerial wiring of the lead wire, it is possible to reduce the number of work steps.

Since the transformer is mounted on the circuit board, workability is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional small flyback transformer.

FIG. 2 is a sectional view of a small flyback transformer according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a small flyback transformer according to an embodiment of the present invention.

[Explanation of symbols] 1 bobbin 2 cores 3 diode 4 capacitors 5 Anode lead 6 division resistance 7 Insulation case 8 shield case 9 partitions 10a resistance 10b diode 10c capacitor 11 bobbins 12 cores 13 diode 14 Capacitor 15 Anode lead 16 division resistance 17 Insulation case 18 Shield case 19 Substrate (for high voltage rectifier) 20 substrates (for low voltage rectifier) 20a Notched hole 21 diode

Continued front page    (72) Inventor Shiro Doi             1-54-17, Okusawa, Setagaya-ku, Tokyo Mido             Re Radio Co., Ltd. (72) Inventor Kiyoshi Harada             1-54-17, Okusawa, Setagaya-ku, Tokyo Mido             Re Radio Co., Ltd. F-term (reference) 5E070 AA13 FE04

Claims (2)

[Claims] 1. A transformer part in which a core is incorporated into a wound bobbin, a high-voltage rectification part composed of electric parts such as a diode, a capacitor, and an anode lead, and a low-voltage rectification part composed of electric parts such as a diode and a capacitor. In a small flyback transformer composed of an electric component such as a voltage dividing resistor, at least a plurality of circuit boards are used, and a diode, a capacitor, and an anode lead are connected using a pattern wired on the circuit boards. A circuit that constitutes a high-voltage rectification unit by connecting a diode and a capacitor to the other circuit substrate, and a transformer unit that constitutes the high-voltage rectification unit. Arranged so as to be sandwiched between the board and the circuit board that constitutes the low-voltage rectification unit, and each of the circuit boards serves as an electrical component such as a voltage dividing resistor Small flyback transformer characterized by more electrical connection. 2. The small flyback transformer according to claim 1, wherein the transformer section is mounted on one of a circuit board forming the high-voltage rectifying section and a circuit board forming the low-voltage rectifying section.