JPS6097683A - Ac lighting gas laser - Google Patents

Abstract

PURPOSE:To lessen bad influences, which are exerted upon the transformer and the discharge tube due to abnormal high voltage to generate on the output side of the high- voltage transformer when discharge of the discharge tube was started or the discharge ended, by a method wherein, even when the discharge tube is not discharging, voltage in a degree, that the discharge is not started, is kept having been always impressed. CONSTITUTION:When an oscillation starting switch 1 is in an ON state, the contact 8 of a zero detecting circuit 6 is in an ON state, and the output voltage of an oscillating circuit 2 is inputted in the input terminals of a transformer 3 through an auxiliary voltage resistor 7. At this time, voltage (namely, auxiliary voltage) lower than the discharge starting voltage of a discharge tube 4 has been impressed in between the anode 4a and the cathode 4c of the discharge tube 4. Accordingly, discharge of the discharge tube 4 is not performed under this condition. When the oscillation starting switch 1 is turned to OFF, the contact 8 of the zero detecting circuit 6 is turned to OFF. Accordingly, output voltage, which is outputted from the oscillating circuit 2, is directly impressed on the primary side of the transformer 3, afte the zero detecting circuit 6 detected a fact that the voltage between input terminals 6a and 6b is 0(V). At this time, discharge, in which the discharge current thereof is limited by a limiting resistor 5, is performed in between the anode 4a and the cathode 4c of the discharge tube 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an AC-lit gas laser device.

A conventional AC lighting gas laser device has a configuration as shown in the block diagram of FIG. That is, when the oscillation start switch 1 is open, the output voltage of the 1 oscillation circuit 2 is the same as that of the transformer 3.
Since no voltage is applied to the input of the discharge tube 4, the anode 4 of the discharge tube 4
a, the voltage between the cathode 40 is 0 (V), but when the oscillation start switch 1 is closed, the output from the oscillation circuit 2 is applied to the input side of the transformer 3, so the anode 4a of the discharge tube 4 ,, a voltage that can start a discharge (hereinafter referred to as a discharge start voltage) is also applied between the cathodes 4c, and as a result, a discharge is performed in which the discharge current is limited by the limiting resistor 5.In other words, in order to start the discharge , the anode 4 of the discharge tube 4
a. The voltage across the cathode 4C was rapidly raised from 0 [V] to a high voltage, and conversely, in order to terminate the discharge, the voltage was suddenly lowered from the high voltage to 0 [V]. Therefore,
A sudden change in the input voltage of the transformer 3 may cause an abnormally high voltage to be generated in the output voltage of the transformer 3, and the abnormally high voltage may be caused by the abnormally high voltage in the output voltage of the transformer 3. This had the disadvantage that it adversely affected the insulating member of the discharge tube 4.

The present invention was made in order to improve the drawbacks of such conventional devices, and the present invention has been made in order to improve the shortcomings of the conventional device. , the anode 4 of the discharge tube 4 from the transformer 3
a and the cathode 4c, and when discharging, the preliminary voltage is increased to the discharge starting voltage, thereby converting the conventional transformer 3. A gas laser device is provided in which the adverse effect on the insulating portion of the discharge tube 4 is reduced.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing the control system of the gas laser device of the present invention. In FIG. 2, a preliminary voltage resistor 7 is connected between the terminal and the terminal, and a contact 8 is connected in parallel to the preliminary voltage resistor 7.

The zero detection circuit 6 detects that the input voltage to the oscillation start switch 1 is 0 [V], and opens and closes the contact 8. Therefore, when the oscillation start switch 1 is open, the contact 8 of the zero detection circuit 6 is open, and the output voltage of the oscillation circuit 2 is inputted to the input terminal of the transformer 3 through the preliminary voltage resistor 7. At this time, the anode 4a of the discharge tube 4
, and the cathode 4c, a voltage (ie, preliminary voltage) lower than the discharge starting voltage of the discharge tube 4 is applied. Therefore, in this state, the discharge tube 4 does not discharge.

Next, by closing the oscillation start switch 1, the contact 8 of the zero detection circuit 6 is closed. Therefore, the output voltage from the oscillation circuit 2 is directly applied to the primary side of the transformer 3 after the zero detection circuit 6 detects 0 [V] of the voltage between the input terminals 6a and 6b. At this time, a discharge whose discharge current is limited by the limiting resistor 5 occurs between the anode 4a and cathode 4C of the discharge tube 4.

A time chart showing the relationship between the oscillation start switch 1 and the output voltage of the transformer 3 is shown in FIG.

A is the operating state of the oscillation start switch 1, and B is the output voltage waveform of the transformer 3. In FIG. 3, when the oscillation start switch 1 is open, the output voltage of the transformer 3 has a peak value of -L, and oscillation does not occur at this time. Next, when the oscillation start switch 1 is turned off, the waveform shifts to the peak value VH from the moment the output voltage of the transformer 3 becomes 0 (point P). When the oscillation start switch 1 is opened again, the output waveform shifts to the peak value V from the moment the output voltage becomes 0 (point Q).

Next, the relationship between the output voltage C of the transformer 3 and the discharge current of the discharge tube 4 is shown in FIG. In FIG. 4, oscillation starts only when the output voltage of the transformer 3 exceeds v2. At the same time, a discharge current begins to flow, and if the output voltage is 71 or higher, oscillation continues.

It is exactly the same for Vly v2 Nitto).

As described above, in the present invention, even when the discharge tube is not discharging, by constantly applying a voltage to the extent that the discharge does not start, the high-voltage transformer generated when the discharge starts or ends. It has the feature of reducing the adverse effects on the transformer and discharge tube due to abnormally high voltage on the output side of the transformer.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional gas laser device, Fig. 2 is a block diagram showing an embodiment of the gas laser device of the present invention, and Fig. 3 is a time diagram showing the relationship between the oscillation start switch and the output voltage of the transformer. The chart diagram, FIG. 4, is a waveform diagram showing the relationship between the output voltage of the transformer and the discharge current of the discharge tube. 1... Oscillation start switch 2... Oscillation circuit 3...
Transformer 4 river discharge tube 5...Limiting resistance 6...Zero detection circuit 7...Contact 8...Preliminary voltage resistance

Claims (1)

[Claims] 1. In an AC lighting gas laser device that uses discharge as excitation energy, a voltage below the discharge starting voltage (referred to as preliminary voltage) is applied in advance to the discharge tube before the discharge starts, and the A gas laser device characterized in that the preliminary voltage is raised to a discharge starting voltage or higher. 2. The gas laser device according to claim 1, wherein the preliminary voltage is increased to the oscillation start voltage or higher at the moment the preliminary voltage reaches 0 [V].