Oscillator, and an oscillator characteristic adjustment method

An oscillator, comprising:

• a circuit board having a dielectric layer therein;
• an oscillator circuit comprising a plurality of components and an inductor element, the plurality of components being mounted on a front surface of the circuit board,
• wherein at least a part of the inductor element is internally disposed in the dielectric layer;
• and
• a back conductor covering a major part of a back surface of the circuit board,
• wherein the back conductor has a slit or pinhole which allows the dielectric layer and the internally disposed part of the inductor element to be partially cut by a laser beam passing through the slit or pinhole for adjustment of an oscillator characteristic,
• wherein the inductor element is colored on a surface of the internally disposed part thereof for reducing reflection of the laser beam.

An oscillator, comprising:

• a circuit board having a dielectric layer therein;
• an oscillator circuit comprising a plurality of components and an inductor element, the plurality of components being mounted on a front surface of the circuit board,
• wherein at least a part of the inductor element is internally disposed in the dielectric layer;
• a back conductor covering a major part of a back surface of the circuit board;
• and
• a laser blocking conductor internally disposed between the inductor element and the front surface of the circuit board, but in the dielectric layer,
• wherein the back conductor has a slit or pinhole which allows the dielectric layer and the internally disposed part of the inductor element to be partially cut by a laser beam passing through the slit or pinhole for adjustment of an oscillator characteristic.

A method for adjusting an oscillation characteristic of an oscillator comprising a circuit board having a dielectric layer therein;

• an oscillator circuit comprising a plurality of components and an inductor element, the plurality of components being mounted on a front surface of the circuit board, and at least a part of the inductor element being internally disposed in the dielectric layer;
• and a back conductor covering a major part of a back surface of the circuit board, the method comprising:
• forming a slit or pinhole in the back conductor;
• cutting the dielectric layer and the internally disposed part of the inductor element by a laser beam through the slit or pinhole;
• and
• placing a shield cap over the front surface of the circuit board before said step of cutting the dielectric layer and the internally disposed part of the inductor element.

A method for adjusting an oscillation characteristic of an oscillator comprising a circuit board having a dielectric layer therein, an oscillator circuit comprising a plurality of components and an inductor element, the plurality of components being mounted on a front surface of the circuit board, and at least a part of the inductor element being internally disposed in the dielectric layer, and a back conductor covering a major part of a back surface of the circuit board, the method comprising:

• forming beforehand a slit or pinhole in the back conductor;
• and
• partially cutting the dielectric layer and the internally disposed part of the inductor element by a laser beam through the slit or pinhole,
• wherein, when said at least a part of the inductor element that is internally disposed is partially cut through the slit or pinhole, a heat sink is contacted with the back conductor in the vicinity of the slit or pinhole.

An oscillator, comprising:

• a circuit board having a dielectric layer therein;
• an electronic circuit having a portion thereof surface mounted on a first surface of the circuit board;
• a resonant circuit coupled to the electronic circuit and having an inductive element within the dielectric layer;
• a conductive layer on a second surface of the circuit board opposing the first surface,
• the conductive layer having an opening which exposes a portion of the dielectric layer and a portion of the inductive element to a laser beam which is passed through the opening to adjust an operating frequency of the oscillator,
• wherein at least said exposed portion of the inductive element is adapted to reduce a reflection of the laser beam therefrom.