KR20040086646A - Laser Tuning method for Resonance Frequency of ASK module - Google Patents

Abstract

PURPOSE: A method for tuning the resonance frequency of an amplitude shift keying(ASK) module by using a laser beam is provided, in which the resonance frequency is tuned by controlling the path length of resonance pointer of ASK module. CONSTITUTION: A method for tuning the resonance frequency of an amplitude shift keying(ASK) module by using a laser beam is characterized in that the resonance frequency of the ASK module is tuned by controlling the path length of the resonance pointer, wherein the controlling step is performed by removing a portion of the copper layer formed on the resonance pointer by using a laser beam.

Description

Laser Tuning Method for Resonance Frequency of ASK Module

The present invention relates to tuning a resonant frequency of an ASK module using a laser beam, and more particularly, to handle a high frequency signal such as a radio frequency (RF) remote control for an automobile, an RF remote control for a home appliance, and the like. Amplitude Shift Keying (ASK) module that is mounted as a component inside an apparatus, etc. The present invention relates to a method and an automated device for tuning (tuning) the resonance frequency of a module resonant circuit with a laser.

When a digital signal is to be transmitted through a transmission path having a bandpass characteristic, a carrier suitable for the frequency characteristic of the transmission path must be modulated using a digital signal and transmitted. This is called digital modulation. There are several basic forms of digital modulation. ASK is the analog modulation method, Amplitude Modulation (AM).

Recently, with the rapid growth of the information and communication market, various electronic devices have become miniaturized and highly functional, and therefore, electronic components have been researched in order to satisfy these trends. That is, miniaturization of the information processing device and communication device parts and the increase of the operation speed are required. Therefore, the frequency of the signal used has increased from the hundreds of MHz to several GHz in the radio frequency range. There is a need for a high frequency resonant circuit capable of operating stably at.

The resonant circuit is also called a tuning circuit. In an electric circuit composed of a coil and a capacitor, the resonance is electrically resonated at a specific frequency determined by the values of the coil and the capacitor. It becomes a circuit.

Usually, it refers to a circuit that can freely convert the electrostatic energy of the capacitor (C component) and the electromagnetic energy of the inductance (L component) .The series resonant circuit in which the C component and the L component are connected in series and the parallel resonant circuit in which they are connected in parallel Basic

The requirements for the configuration of the high frequency resonant circuit include the presence of the L component acting as the reactance and the C component acting as the capacitance, and the characteristic of being tuned to the required frequency component by adding and subtracting the L and C components.

In general, the implementation of the tuning characteristics is a combination of the C component by winding the copper wire spirally to form the L component, the two copper plates facing each other, the conventional tuning technique C trimmer and L which is a component for adjusting the L component and C component The trimmer is manually adjusted.

The above method is easy to manufacture and simple to assemble, but the reduction in precision by hand and the change in tuning frequency due to vibration, shock, and temperature caused by temporal and spatial changes act as a critical cause for securing the reliability and stability of the device.

On the other hand, laser means a device or light beam that amplifies or oscillates very short wavelength electromagnetic waves by applying quantum mechanics. Laser light has excellent monochromaticity, uniform phase, good light condensation, and high energy density. Has Currently, it is applied to holography, laser processing, medical care, and communication. In particular, it is necessary to pay attention to a technology for marking by punching or marking an object. The principle of the technique is that when a laser beam is irradiated to the material, the material absorbs the energy of the laser beam and breaks down a bond of molecules or atoms constituting the material, thereby releasing a part of the material from the body in a plasma state or a gas state. Let's do it. By using this principle of laser, the surface of the resonant pointer (1), which is a copper foil on a PCB (Printed Circuit Board) in the ASK module resonant circuit, is imprinted and the path length of the resonator is adjusted. ASK) module can be tuned to the desired frequency.

The present invention relates to a resonant frequency tuning method and an automated device of an ASK module. Specifically, a laser beam is irradiated onto a surface of a resonant pointer on a resonant circuit of an ASK module. By adjusting the path length of the pointer, the resonance frequency of the ASK module is tuned by adjusting the L component acting as a reactance of the ASK module using the laser beam. To provide a resonant frequency tuning method and automation apparatus.

1 is a resonant circuit diagram of an ASK module before a laser tuning operation;

Figure 2 is a circuit diagram showing a portion of the copper foil of the resonant pointer is removed by irradiating a laser beam on the surface of the resonant pointer on the resonant circuit of the ASK module,

3a is a cross-sectional view of irradiating a laser beam on the copper foil surface on the PCB,

3b is a cross-sectional view showing a portion of the copper foil surface on the PCB irradiated with the laser beam removed and the insulator 4 of the PCB substrate exposed;

4 is a plan view showing an example of the ASK module in the form of a PCB array (array) according to an embodiment of the present invention,

FIG. 5 is a block diagram showing an apparatus for automatically tuning a resonance frequency of an ASK module with a laser according to an embodiment of the present invention; FIG.

6 is a flowchart of automatic control for tuning a resonant frequency of an ASK module according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: Resonant pointer on resonant circuit of ASK module 2: Stripline L pattern

3: laser-tuned resonant pointer 4: insulator on PCB substrate

As a technical means for achieving the above object, the present invention uses the principle of adjusting the electrical characteristics by causing a physical change on the surface of the resonance portion on the PCB by using the characteristics of the laser having a high energy density. 1 is a view showing a resonant circuit of an ASK module before a laser tuning operation.

A portion of the surface of the resonator is removed by irradiating a laser beam to the surface of the resonant pointer 1 on the resonant circuit of the ASK module. Figure 2 is a portion of the resonant pointer surface (1) which is a copper foil on a PCB (Printed Circuit Board) by irradiating a laser beam on the surface of the resonant pointer on the resonant circuit of the ASK module according to an embodiment of the present invention. This figure shows the removed state. Compared with the resonant pointer before irradiating the laser beam, there is an effect that the electrical path becomes longer, so that the reactance component having the L-value becomes larger and the resonant frequency becomes lower than the first. When the laser beam is irradiated onto the material surface, the material surface receives energy from the laser beam. When the laser beam is irradiated on the surface of the material by adjusting the energy density of the laser beam, the number of pulses per second, the time the laser beam is irradiated, and the irradiation path, the bond of molecules or atoms constituting the material surface can be broken. The molecules or atoms leave the material surface in a plasma state or a gas state. As shown in Figure 3a, by focusing the laser beam on the copper foil surface of the PCB (Printed Circuit Board), by adjusting the energy density, the number of pulses per second, the irradiation time and the irradiation path, the copper foil surface You can adjust the marking part by the length you want.

3B is a view showing a portion of the copper foil on the PCB irradiated with the laser beam is removed and the insulator 4 is exposed.

There are various types of lasers such as solid lasers, gas lasers, semiconductor lasers, etc., by selecting a laser suitable for the surface characteristics of the copper foil of the resonator, and adjusting the energy density of the laser beam, the number of pulses per second, the irradiation time, the irradiation path, and the like. Process treatment can be performed.

4 illustrates an example of an ASK module in the form of a PCB array according to an embodiment of the present invention.

As the ASK module is manufactured in an ultra-small size on an array-type PCB substrate in which several modules are gathered at once, the tuning process using the laser includes a resonant frequency measuring device, a laser generator and a power supply unit, It is desirable to have and implement any automated system that can control the work jig or the like with a computer.

Hereinafter, a resonance frequency laser tuning device of an ASK module according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a diagram illustrating an example of an apparatus for resonant frequency laser tuning of an ASK module according to an exemplary embodiment of the present invention. Referring to FIG. 5, the frequency laser tuning device includes a resonant frequency measuring device, a laser generator and a power supply, a working jig, a control computer, and the like.

The work jig fixes the array PCB module during laser marking, and is equipped with a detection means called a test pointer or a probe to measure the resonance frequency of the PCB module and transfer it to the frequency measuring device.

Resonant frequency measuring device is a device that receives and analyzes the measured frequency signal like Spectrum Analyzer, and receives the measured value from the frequency detecting means installed in the work jig and works with the preset resonance frequency. It is then analyzed and communicates this information to the control computer.

The laser generator performs marking by adjusting the energy density of the laser beam, the number of pulses per second, and the irradiation time of the laser beam according to the control signal of the control computer.

The power supply unit supplies a specific current operating power to the array PCB module fixed to the work jig so that the resonance frequency of the ASK module can be measured during laser operation to adjust the resonance frequency.

The control computer stores the laser marking length adjustment information corresponding to a specific frequency value, which is obtained from several empirical experiments in advance and average data values derived therefrom.

In addition, the control computer is connected to a resonant frequency measuring device, a laser generator, a jig and a power supply to control the devices in accordance with a predetermined resonant frequency set value and a work order.

6 is a flowchart of automatic control of tuning a resonant frequency of an ASK module according to an embodiment of the present invention. After the laser tuning device described above, a flow chart shown in FIG. 6 is programmed and installed in a computer.

Hereinafter, the procedure of automatic control for tuning the resonant frequency of the ASK module according to the present invention will be described in detail with reference to FIG. 6.

A first step S1 of mounting a PCB array to a working jig to be used for laser tuning,

A second step S2 of setting a set value,

A third step (S3) of first checking the state of the module such as resonant frequency, voltage, current,

A fourth step (S4) of calculating a difference value between the set frequency and the measured value,

A fifth step S5 of performing laser tuning to an approximate value according to the difference value,

A sixth step (S6) for secondaryly checking the state of the module such as the resonant frequency, voltage, current after tuning,

A seventh step S7 of determining whether the set frequency error value is reached;

An eighth step S8 of performing second fine tuning according to the selected laser adjustment value;

A ninth step (S9) of measuring the frequency, current, voltage, etc. of the worked module;

A tenth step S10 of storing the measured frequency, current, voltage, etc. in a database;

Eleventh step S11 of determining whether to continue the tuning process on the PCB array;

A twelfth step (S12) of moving the tuning target to the next module on the array and executing it again from the third step;

According to the first to twelfth steps, the resonance frequency tuning of each ASK module on the PCB array is automatically controlled.

In the first step, the PCB array is fixed to a work jig and a tuning operation is prepared.

In the second step, the appropriate energy density of the laser beam, the number of pulses per second are set, the ASK module is tuned to set a target resonant frequency value, and the target module to be tuned is input to the computer. to be. In the second step, it is desirable to document the length adjustment information of the laser marking corresponding to a specific frequency value, store it in a computer, and call it out if necessary.

In the third step, the frequency detecting means mounted on the working jig contacts the measurement terminal of the designated ASK module to measure the resonance frequency, voltage, and current.

The fourth step is calculating a difference between the set resonance frequency value and the measured resonance frequency value.

In the fifth step, trimming is performed first to an approximation according to the difference value calculated in the fourth step by adjusting the energy density of the laser beam and the number of pulses per second.

In the sixth step, the resonant frequency, voltage, and current of the ASK module, which is first trimmed in the fifth step, are measured.

The seventh step checks whether the resonant frequency measured in the sixth step is within the error range of the set frequency, and if the error value is entered, the ninth step is executed, and if the error range is out of the error range, the second fine trimming operation is performed. Make a judgment.

The eighth step is to perform the second fine trimming operation precisely according to the set laser adjustment value.

The ninth step is to finally measure the resonant frequency, voltage, current, and the like.

The tenth step is storing and documenting the measured values measured in the ninth step in a database.

The eleventh step is terminated if there is no next laser tuning target, and the tuning operation continues if the tuning target remains.

The twelfth step causes the third step to be executed after moving to the next tuning target module on the PCB array.

As described above, when the resonance frequency tuning for one ASK module is completed, the laser generator or the work jig is moved so that the next tuning target module can be operated, and the resonance frequency tuning of the module is again performed. In the end, all specified modules on the PCB array are tuned.

Herein, although the present invention has been described with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and applications can be made without departing from the spirit and scope of the present invention as set forth in the claims below. This will be possible.

As described above, the resonant frequency tuning method and the automation apparatus using the laser beam of the present invention has the following effects.

First, the laser beam is irradiated instead of manually adjusting the C trimmer and the L trimmer, which are components for adjusting the L component and the C component, and the L component is adjusted based on the empirical experiment and the arithmetic average data derived therefrom. Tuning the frequency by adjusting it can be adjusted to the correct tuning value, which enables the production of ASK modules with precision, reliability and low failure rate.

Second, the C trimmer and L trimmer, which are the components that adjust the L and C components, are expensive parts. The method of adjusting the frequency using laser beams does not require the use of such parts, and mass production by automation devices and processes As a result, it is possible to reduce manufacturing costs by lowering the production cost of ASK modules.

Third, the manually adjusted C trimmer and L trimmer are affected by vibration, shock, and temperature caused by temporal and spatial changes. Therefore, it is difficult to operate stably by adjusting the tuning frequency manually. Since the marking part is not affected by the external change, the ASK module can be expected to operate stably.

Claims (3)

In the method of tuning the resonant frequency of the ASK module using a laser beam, By removing part of the copper foil on the surface of the resonant pointer (1) by adjusting the path length of the resonant pointer (1) to tune the resonant frequency of the ASK module using a laser beam Resonant frequency tuning method of ASK module. The method of claim 1, ASK using laser beams, wherein the ASK module tunes the resonance frequency of the ASK module for each ASK module on the PCB array. Resonant frequency tuning method of module. In the method of tuning the resonant frequency of the ASK module using a laser beam, A working jig for fixing the tuning target during laser marking and equipped with a detection unit to measure the resonance frequency of the tuning target and to transmit the resonance frequency to the frequency measuring device; A resonance frequency measuring device which receives a measurement value from a frequency detecting means mounted on a working jig, analyzes whether the work is being performed at a preset resonance frequency, and transmits this information to a control computer; A laser generator for irradiating a laser beam according to a control signal of a control computer to perform marking of a tuning target; A power supply unit supplying operation power of a specific current to the array PCB module fixed to the work jig; It stores length adjustment information of laser marking corresponding to a specific frequency value and is connected to a resonant frequency measuring device, laser generator, work jig, and power supply to pre-set specific resonant frequency set value and programmed process sequence. And a computer for controlling the devices according to the resonant frequency tuning automation device of the A-SK module using a laser beam.