High-voltage variable resistor unit

A high-voltage variable resistor unit adapted to be mounted on a transformer casing of a fly-back transformer, comprising:

• a first insulating substrate having a front surface and a rear surface and provided on said front surface thereof with a resistance pattern for a variable resistor;
• a second insulating substrate having a front surface and a rear surface and formed on said front surface thereof with a resistance pattern for a fixed resistor including a pair of electrodes;
• a one-side-open insulating casing of a hollow shape made of an insulating resin material and formed on one side thereof with an opening;
• said insulating casing being formed therein with a substrate receiving chamber in which said first insulating substrate is received in such a manner that said rear surface of said first insulating substrate faces said opening of said insulating casing and an attachment receiving chamber in which said second insulating substrate is received;
• said insulating casing being charged therein through said opening with insulating resin for molding of said fly-back transformer;
• a wire-like terminal formed by bending a rigid metal wire;
• said wire-like terminal being arranged so as to extend at both ends thereof toward said opening of said insulating casing and formed at one of said both ends thereof into a shape which permits said one end of said both ends to be inserted into a terminal provided on a side of said fly-back transformer;
• a holder made of insulating resin and received in said attachment receiving chamber to hold said second insulating substrate therein;
• said holder being provided with fitting means in which said wire-like terminal is fittedly received, resulting in said wire-like terminal being kept at a predetermined posture;
• said holder including an opening facing wall facing said opening of said insulating casing, said opening facing wall being formed with a plurality of through-holes through which said insulating resin flows;
• a first lead wire connected at one end thereof to one of said electrodes and at the other end thereof to one end of said wire-like terminal;
• and
• a second lead wire connected at one end thereof to the other of said electrodes and at the other end thereof to said terminal fitment electrically connected to said resistance pattern.

A high-voltage fixed resistor comprising:

• an insulating substrate having a front surface and a rear surface and formed on said front surface thereof with a resistance pattern including a pair of electrodes;
• first and second lead wires connected to said electrodes, respectively;
• a wire-like terminal formed by bending a rigid metal wire;
• said wire-like terminal being connected at one end thereof to said first lead wire and provided at the other end thereof with a connection;
• and
• a holder of a hollow shape which is made of insulating resin and in which said insulating substrate is securely received while keeping said first and second lead wires extending out of said holder;
• said holder being provided on an outside thereof with a fitting means in which said wire-like terminal is fittedly received, resulting in said wire-like terminal being kept at a predetermined posture.