JPS638010Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a safety device for a light source device that utilizes microwave discharge.

BACKGROUND ART Recently, light source devices using electrodeless lamps that utilize microwave discharge, which have characteristics such as longer lifespan and shorter light emission rise time than conventional electrode lamps, have been attracting attention. Since this device uses microwaves, microwave leakage is a problem.
Furthermore, since a microwave oscillator that generates microwaves usually uses a high-voltage power supply, safety against high voltages becomes an issue.

This idea was made with the aim of ensuring safety against microwave leakage and high voltage as described above, and includes a switch that detects the metal mesh plate that shields microwaves and the lid of the box that covers the entire device. By providing this, safety can be ensured.

FIG. 1 is a cross-sectional schematic diagram showing an embodiment of this invention. In the figure, 1 is a magnetron which is a microwave oscillator that generates microwaves, 2 is a magnetron antenna, 3 is a waveguide, 4 is a cavity wall, and 5
is fixed by a metal mesh plate between the flange portion 6 of the cavity wall 4 and the presser flange 7. Also, 8 is the cavity wall 4
and a metal mesh plate 5; 9 is a power feed port provided at the joint between the cavity wall 4 and the waveguide 3; 10 is a support rod (not shown) in the microwave cavity 8; A spherical electrodeless discharge lamp supported by
11 is a fan, 12 is a hood, 13 is an air outlet provided at the bottom of the waveguide, 14 and 15 are capacitors, and 16 is a transformer.
4, 15, a transformer 16, a diode (not shown), and the like constitute a power supply device 17 for the magnetron 1. 18 is a box body that covers the whole, and the upper part 19
It is a lid that can be opened and closed. 20 is a lens that collects light from the electrodeless discharge lamp. 23 is a switch installed inside the box body so as to close the circuit when the lid is closed; 21 is a switch mounted on the side of the cavity wall 4 with a jig 22 so as to close the circuit when the metal mesh plate 5 is attached. It is an installed switch.

In the microwave discharge light source device configured in this way, microwaves generated by the magnetron 1 supplied with a high voltage from the power supply 17 are delivered to the microwave cavity from the feed port 9 through the magnetron antenna 2 and the waveguide 3. 8 to generate a microwave electromagnetic field. Due to this microwave electromagnetic field, a rare gas, such as argon gas, sealed in the electrodeless discharge lamp 10 is discharged, and other sealed metals such as mercury are evaporated, and the discharge is mainly of metal vapor. Light corresponding to the emission spectrum of is emitted.
This light is irradiated onto the irradiated surface directly or reflected by the inner surface of the cavity wall 4. Also, cooling air is blown by the fan 11, and the cooling air is applied to the discharge lamp 10 through the air outlet 13 and the power supply port 9.
to cool down. The box body 18 covers the entire device, and a lid 19 that can be opened and closed is provided at the top.

When repairing the inside of this device or replacing parts, the lid 19 is opened. Further, when replacing the electrodeless discharge lamp 10 or the metal mesh plate 5, the holding flange 7 fixed with screws or the like is removed. When operating this device after completing these replacement and repair work, if you forget to attach the metal mesh plate 5, one side of the microwave cavity 8 will be missing, and the microwave cavity will not be able to function properly. It doesn't make sense.
For this reason, not only is it impossible to discharge the discharge lamp 10 normally, but also a large amount of microwaves are emitted to the outside, which may sometimes be harmful to the human body. On the other hand, if you turn on the power without closing the lid 19 of the box 18, you may come into contact with high voltage parts inside the device.
Furthermore, since the light is directly emitted without passing through the lens 20, harmful ultraviolet rays that should normally be blocked by the lens are emitted to the outside, which poses a safety problem.

Switch 21 and switch 23 are installed to eliminate the above-mentioned safety problem, and the lid 1
If 9 is not closed or the metal mesh plate 5
If the magnetron 1 is not installed, the magnetron 1 cannot be powered on.

FIGS. 2 and 3 are enlarged views of the vicinity of the switch 21, and when the metal mesh plate 5 is installed as shown in FIG. closed circuit) state. If the metal mesh plate 5 is not attached as shown in FIG. 3, the switch bar 21a of the switch 21 is not pressed and the switch 21 remains in the open state because the presser flange 7 has the punch hole 7a. Switch 2 is also activated when neither presser flange 7 nor metal mesh plate 5 is attached.
1 is in a similar state. On the other hand, the switch 23 is operated by the lid 19 of the box body 18. That is, the switch 23 is in a closed state with the lid 19 closed. If these switches 21 and 23 are connected in series to the power on switch, the power cannot be turned on when the lid 19 is open or the metal mesh plate 5 is not attached, and the high The device will be free from the risk of being electrocuted by voltage, emitting harmful ultraviolet rays to the outside, or emitting large amounts of microwaves.

In the above description, only one switch 23, which is closed by the lid 19, is provided.
This switch may be provided at a plurality of locations and connected in series, in which case greater safety can be ensured. It goes without saying that a plurality of switches 21 closed by the metal mesh 5 may be provided in the same manner.

FIG. 4 is a power supply circuit diagram showing an embodiment of this invention. In the figure, 161 is the heater transformer of magnetron 1, D ₁ and D ₂ are rectifier diodes, R is a relay, R _a1 and R _a2 are contacts of relay R, S _h is a high voltage switch, S is a power switch, E is a commercial power supply, and the other parts have the same symbols as in FIG. 1. As can be seen from this figure, when the switch S is turned on, the heaters of the fan 11 and the magnetron 1 are turned on. After that, when switch S _h is turned on, interlock switches 21 and 23
If is closed, relay R operates and contacts
R _a1 and R _a2 are closed and a high voltage is applied to the magnetron's anode to generate microwaves. If the metal mesh plate 5 is not installed, the switch 2
1 is closed or the switch 23 is opened because the lid 19 is open,
Even if switch S _h is turned on, relay R does not operate and no high voltage is applied to the anode of magnetron 1, so no microwave is generated. As mentioned above,
When switch 21 or switch 23 is open, only the high voltage is not applied when switch S _h is turned on, while the heater and fan are operating. When the switches 21 and 23 are connected in this way, the heater of the magnetron 1 is always heated, and the fan 11 is also operating, so that the discharge lamp 10 and other parts are constantly cooled. Therefore, if the open switch 21 or switch 23 is closed, the magnetron 1 can immediately start operating, and cooling is also performed satisfactorily.

As described above, this invention consists of a microwave cavity composed of a bowl-shaped cavity wall and a metal mesh plate that covers the opening of the cavity wall, and a microwave cavity that is arranged inside the microwave cavity. installed electrodeless discharge lamp, microwave oscillator, power supply device for this microwave oscillator,
and a box body that covers the entire body and has a lid that can be opened and closed in part, in which a single switch or a series of multiple switches are closed by the peripheral edge of the metal mesh plate. The interlock mechanism of the power supply device is formed by connecting a first switch to a second switch, which is one switch or a series of a plurality of switches, which are closed by the lid of the box. This feature has the effect of ensuring safety because the power supply cannot be turned on when the metal mesh plate is not attached or the lid is not closed.

[Brief explanation of the drawing]

Fig. 1 is an overview sectional view showing an embodiment of this invention, Fig. 2 is a sectional view of the main part when the metal mesh plate is attached, and Fig. 3 is a sectional view of the main part when the metal mesh plate is not attached. 4 are power supply circuit diagrams. In the figure, 1 is a magnetron, 4 is a cavity wall,
5 is a metal mesh plate, 8 is a microwave cavity, 10
is an electrodeless discharge lamp, 17 is a power supply device, 18 is a box body,
19 is the lid, 21 is the first switch, 23 is the second
It is a switch. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A microwave cavity consisting of a bowl-shaped cavity wall and a metal mesh plate covering an opening in the cavity wall; In a microwave discharge light source device consisting of an electrodeless discharge lamp, a microwave oscillator, a power supply device for the microwave oscillator, and a box that covers the entire body and has a partially openable lid, the metal mesh plate The first switch, which is one switch or a series body of a plurality of switches, is closed by the peripheral edge of the switch.
The interlock mechanism of the power supply device is characterized in that the switch is connected in series with a second switch, which is one switch or a series of a plurality of switches, which are closed by the lid of the box body. Microwave discharge light source device. (2) A microwave discharge light source device according to claim 1 of the utility model registration claim, characterized in that a series body of a first switch and a second switch is connected in series with an anode power supply switch of a microwave oscillator. .