JPS6087988A - Laser device - Google Patents

Abstract

PURPOSE:To detect abnormality with simple and inexpensive constitution by attaching a magnetic core penetrated with a grounding terminal to a part of a housing, providing a detecting element thereto, providing a comparator circuit which compares the output thereof with a reference value and controlling an alarm, etc. by the output from the comparator circuit. CONSTITUTION:A magnetic core 1 which is penetrated internally with a grounding terminal 5 connected with an outside grounding wire 3 and an inside grounding wire 4 by penetrating through a part of a housing 2 of a power source devide and consists of ferrite, etc. is attached to said housing and a secondary winding 6 which is a detecting body is wound to a part of such core 1. The output of the secondary winding 6 is connected to an amplifier circuit 7. When the wire 3 is disengaged or disconnected, the slight leak current of the grounding line flowing in the core 1 is no more passed and the input to the circuit 7 is decreased as well. The output is compared with a set reference power source 10 by the circuit 9 by which abnormality is detected and an alarm circuit 11 is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a laser device equipped with an abnormality detection sensor.

Conventional configurations and their problems Generally, in devices that require high-voltage power supplies, such as high-output carbon dioxide lasers, a part of the casing is externally grounded to prevent electrical shocks caused by insulation leaks or high-voltage sparks from the high-voltage power supply. In particular, medical devices such as laser scalpels require sufficient safety management, and in addition to ensuring initial grounding, continuous monitoring is required for subsequent grounding wire breakage or high-voltage insulation leaks, and long-term safety management is required. Safety must be ensured. However, in most conventional methods of checking the grounding of equipment, inspectors regularly visit the equipment to check for disconnections in the grounding wire and for insulation leaks, which is not sufficient.

OBJECTS OF THE INVENTION The present invention has been made from this point of view, and it is an object of the present invention to provide a highly safe laser device that can detect disconnection of a grounding wire or insulation leak with an extremely simple configuration. .

1. Knowledge of the Invention The present invention provides a magnetic core with a grounding terminal passed through it in a part of the casing of the power supply device, provides a sensing body such as a winding on this magnetic core, and uses the output of this sensing body as a reference value. A comparison circuit is provided for comparison, and the output of this comparison circuit is used to control alarms and the like.

Embodiment 8 An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 passes through a part of the main body 2, and an external grounding wire 3
A magnetic core made of ferrite or the like passes through a grounding terminal 5 to which an internal grounding wire 4 is connected. 6 is a secondary winding wound around a part of the magnetic core 1. The output of this secondary winding 6 is connected to an amplifier circuit 7. 8 is a rectifier circuit that amplifies the output of this amplifier 7, 9 is a comparator circuit that compares the output of this rectifier circuit 8 with a reference value, 1Q is a reference power supply that determines the ground disconnection and insulation leak level, and 11 is a comparator circuit 9. This is an alarm circuit that uses an output signal to generate an alarm buzzer, display an error message, or stop the device due to an error.

Moreover, FIG. 2 shows another embodiment, in which a notch is provided in a part of the magnetic core 1 similar to that in FIG.
is inserted, its output is amplified by an amplifier circuit 7, and further compared with a reference power source 1o by a comparator circuit 9 in the same manner.

Next, to explain its operation, in the configuration shown in Figs. 1 and 2, if the external ground wire is lost or disconnected for some reason, the minute leakage current of the ground line flowing inside the magnetic core 1 will stop flowing, and the magnetic The magnetic flux of the core 1 also decreases, and furthermore, the human power required to complete the amplifier circuit decreases, and its output is compared with the reference power supply 10, which is set in the comparator circuit 9 to a value smaller than the output during normal operation and larger than the output during disconnection abnormality. If the result is smaller, the output 1 signal of the comparator circuit 9 changes to rHJ-rLJ and an abnormality is detected, and this change signal activates the alarm circuit 11, which generates an alarm buzzer or displays an abnormality, and even stops the device. will be carried out.

Furthermore, if the setting level of the reference power supply 10 is set to a value higher than the normal value output and lower than the output when a leakage current occurs such as when an insulation leak occurs, the output of the comparator circuit 9 similarly becomes rL when an insulation leak abnormality occurs. ” - “H”, and this change signal makes it possible to operate the alarm circuit 11. Furthermore, the magnetic core 1 detects a minute magnetic flux due to a minute current, and is highly susceptible to the influence of external magnetic fields. Therefore, in order to obtain a more stable and reliable product, it is necessary and effective to electromagnetically shield the entire core with an iron plate or the like.

Effects of the Invention As described above, according to the present invention, a safe and highly reliable laser device capable of detecting disconnection of a grounding wire or an abnormality of insulation leakage has become possible with an extremely simple and inexpensive configuration. .

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of a laser device in one embodiment of the present invention, and FIG. 2 is a principle diagram of a laser device in another embodiment. 1... Magnetic core, 2... Body, 3... External grounding wire, 4... Internal grounding wire, 5 Grounding terminal, 6-
Secondary winding, 7... Amplifier circuit, 8... Rectifier circuit, 9-... Comparison circuit, 10... Reference power supply, 11...
... Comparison circuit, 12... Hall element.

Claims (2)

[Claims] (1) A magnetic core with a ground terminal passed through it is attached to a part of the power supply casing, a sensing body such as a winding is attached to this magnetic core, and a comparison circuit is installed to compare the output of this sensing body with a reference value. A laser device is provided and configured to control alarms, etc. using the output of this comparison circuit. (2) The laser device according to claim 1, wherein the magnetic core is electromagnetically shielded by a metal such as an iron plate.