JP2023061435A - Ultraviolet lamp for vehicle - Google Patents

Abstract

To provide a vehicle UV-lamp capable of suppressing irradiation of an electromagnetic wave.SOLUTION: A vehicle ultraviolet rays discharge lamp includes: a discharge lamp capable of radiating ultraviolet rays; a lighting circuit capable of applying a driving voltage of a predetermined frequency to the discharge lamp; a housing having a box-shape and housing the discharge lamp, and the lighting circuit inside; and a conductive shield provided on at least one of an outer wall of the housing and an inner wall of the housing.SELECTED DRAWING: Figure 3

Description

An embodiment of the present invention relates to a vehicle ultraviolet irradiation device.

There is an ultraviolet irradiation device equipped with a discharge lamp for irradiating ultraviolet rays. Conventionally, such an ultraviolet irradiation apparatus has been used, for example, for curing ultraviolet curing ink, paint, adhesive, etc., for surface modification of materials, and for optical alignment of liquid crystals. In addition, since ultraviolet rays have a bactericidal effect, an ultraviolet irradiation device may be used to kill bacteria or inactivate viruses attached to the surface of a member.
In recent years, reflecting the growing awareness of health, there is an increasing demand for purifying the atmosphere inside a vehicle and the surfaces of objects in a relatively narrow closed space such as the inside of an automobile or a railroad vehicle. .

Here, when the discharge lamp is turned on, electromagnetic waves may be radiated from the ultraviolet irradiation device. In addition, in the case where the ultraviolet irradiation device is a vehicle ultraviolet irradiation device installed in a vehicle such as an automobile or a railway, a narrow space such as a vehicle interior can be used for the vehicle ultraviolet irradiation device and the electronic equipment used for the operation of the vehicle. are often provided together. Therefore, the distance between the vehicular ultraviolet irradiation device and the electronic device is shortened, and the electromagnetic waves radiated from the vehicular ultraviolet irradiation device are more likely to enter the electronic device. When an electromagnetic wave enters an electronic device, it may become electromagnetic wave noise and cause a malfunction of the electronic device.
Therefore, development of a vehicle ultraviolet irradiation device capable of suppressing the radiation of electromagnetic waves has been desired.

JP 2009-195825 A

The problem to be solved by the present invention is to provide a vehicle ultraviolet irradiation device capable of suppressing the radiation of electromagnetic waves.

A vehicle ultraviolet irradiation device according to an embodiment includes: a discharge lamp capable of irradiating ultraviolet rays; a lighting circuit capable of applying a driving voltage of a predetermined frequency to the discharge lamp; and the lighting circuit; and a conductive shield provided on at least one of an outer wall of the housing and an inner wall of the housing.

ADVANTAGE OF THE INVENTION According to embodiment of this invention, the ultraviolet irradiation apparatus for vehicles which can suppress radiation of electromagnetic waves can be provided.

1 is a schematic perspective view for illustrating a vehicle ultraviolet irradiation device according to an embodiment; FIG. FIG. 2 is a schematic cross-sectional view of the vehicle ultraviolet irradiation device in FIG. 1 taken along the line AA. FIG. 2 is a schematic cross-sectional view of the vehicular ultraviolet irradiation device in FIG. 1 taken along the line BB. (a) to (d) are schematic plan views for illustrating forms of windows. FIG. 3 is a schematic enlarged view of a C portion in FIG. 2; FIG. 3 is a schematic enlarged view of a portion D in FIG. 2;

Hereinafter, embodiments will be illustrated with reference to the drawings. In addition, in each drawing, the same reference numerals are given to the same constituent elements, and detailed description thereof will be omitted as appropriate.
The vehicle ultraviolet irradiation device according to the present embodiment can be installed in vehicles such as automobiles and railways. For example, the vehicular ultraviolet irradiation device can be installed in the passenger compartment or trunk room of an automobile, or in the passenger compartment of a railway vehicle. However, the installation location of the vehicle ultraviolet irradiation device is not limited to the illustrated one.

FIG. 1 is a schematic perspective view for illustrating a vehicle ultraviolet irradiation device 1 according to the present embodiment.
FIG. 2 is a schematic cross-sectional view of the vehicle ultraviolet irradiation device 1 in FIG. 1 taken along the line AA.
FIG. 3 is a schematic cross-sectional view of the vehicular ultraviolet irradiation device 1 in FIG. 1 taken along line BB.
As shown in FIGS. 1 to 3, the vehicle ultraviolet irradiation device 1 is provided with, for example, a housing 2, a substrate 3, a discharge lamp 4, a lamp cover 5, a lighting circuit 6, a window 7, and a shield 8. there is

The housing 2 has a box-like shape and has a space inside for housing the substrate 3 , the discharge lamp 4 , the lamp cover 5 , and the lighting circuit 6 . The planar shape of the housing 2 can be, for example, a quadrangle. However, the planar shape of the housing 2 can be appropriately changed according to the space in which the vehicle ultraviolet irradiation device 1 is provided. For example, the planar shape of the housing 2 may be a shape composed of curved lines such as a circle or an ellipse, or a shape composed of curved lines and straight lines. The thickness dimension T of the housing 2 can be made smaller than the planar dimension of the housing 2 . If the thickness dimension T of the housing 2 can be reduced, it becomes easier to provide the electronic equipment used for driving the vehicle together with the vehicle ultraviolet irradiation device 1 .

Also, the housing 2 can be divided into a plurality of parts. In the vehicle ultraviolet irradiation device 1 illustrated in FIGS. 1 to 3, the housing 2 is divided into two in the thickness direction of the housing 2 . If the housing 2 is divided into two in the thickness direction of the housing 2, it becomes easy to attach the substrate 3, the discharge lamp 4, the lamp cover 5, and the lighting circuit 6 inside the housing 2. .

For example, housing 2 can have a first portion 21 and a second portion 22 .
The first part 21 can be, for example, a base on which the substrate 3, the discharge lamp 4, the lamp cover 5 and the starting circuit 6 are mounted.

The second portion 22 can be, for example, a cover that covers the opening side of the first portion 21 . The second portion 22 can be provided with holes 22a for emitting ultraviolet rays. The hole 22 a can be provided at a position facing the discharge lamp 4 .

The second portion 22 can be detachably attached to the first portion 21 . For example, the second portion 22 can be detachably attached to the first portion 21 using elastic force. For example, the second portion 22 can be detachably attached to the first portion 21 using a fastening member such as a screw. The first portion 21 and the second portion 22 illustrated in FIGS. 1 to 3 are detachably connected by an elastic force generated by fitting the opening portions together.

The second portion 22 can also be fixed to the first portion 21 using an adhesive or the like. However, if the second portion 22 is detachably attached to the first portion 21, maintenance such as replacement of the discharge lamp 4 is facilitated.

Here, as shown in FIGS. 2 and 3, a substrate 3, a discharge lamp 4, and a lighting circuit 6 are provided inside the housing 2. FIG. Therefore, if the first portion 21 and the second portion 22 are made of a metal such as an aluminum alloy, there is a risk of electric leakage or short circuit. Therefore, it is preferable to form the housing 2 from a resin having insulating properties. Further, if the housing 2 is made of an insulating resin, it is possible to reduce the weight and manufacturing cost of the vehicle ultraviolet irradiation device 1 . The material of the second portion 22 may be the same as or different from the material of the first portion 21 .

The substrate 3 has a plate shape. The substrate 3 can be provided on the first portion 21 via, for example, a spacer 31 or the like. It should be noted that the substrate 3 may be provided on the convex portion provided on the first portion 21 instead of the spacer 31 . The material of the substrate 3 is not particularly limited. The substrate 3 can be made of, for example, ceramics such as aluminum oxide or aluminum nitride, or organic materials such as paper phenol or glass epoxy. Also, the substrate 3 may be a metal core substrate or the like in which the surface of a metal plate is coated with an insulating material.

A discharge lamp 4 is positioned between the substrate 3 and the second portion 22 . The discharge lamp 4 can be provided at a position facing the hole 22a of the second portion 22 . The discharge lamp 4 can be detachably mounted on a pair of terminal holders 41 . A pair of terminal holders 41 can be provided on the substrate 3, for example. 2 and 3 illustrate the case where one discharge lamp 4 is provided, but a plurality of discharge lamps 4 may be provided. At least one discharge lamp 4 may be provided.

The discharge lamp 4 is not particularly limited as long as it can irradiate ultraviolet rays. The discharge lamp 4 can be, for example, a mercury lamp, a metal halide lamp, a dielectric barrier discharge lamp, or the like. The discharge lamp 4 has, for example, a shape extending in one direction. If the discharge lamp 4 has a shape extending in one direction, it becomes easy to reduce the thickness dimension T of the housing 2 .

The lamp cover 5 is positioned between the substrate 3 and the second portion 22 . The lamp cover 5 can be provided on the substrate 3, for example. The lamp cover 5 has a box-like shape and has an opening on the side opposite to the substrate 3 side. The opening 5 a of the lamp cover 5 faces the hole 22 a of the second portion 22 . Inside the lamp cover 5, the discharge lamp 4 and a pair of terminal holders 41 can be provided. For example, the lamp cover 5 can be made of insulating resin. The material of the lamp cover 5 can be the same as that of the housing 2, for example. Since the lamp cover 5 is exposed to ultraviolet rays emitted from the discharge lamp 4, it is preferable to use a material having a higher resistance to ultraviolet rays than the material of the housing 2.

If the lamp cover 5 is provided, it is possible to prevent the ultraviolet rays emitted from the discharge lamp 4 from entering the inner wall of the housing 2 , the substrate 3 and the lighting circuit 6 . Therefore, it is possible to suppress deterioration of these by ultraviolet rays.

Also, the lamp cover 5 can be given a function of a reflector. For example, the lamp cover 5 can be made of resin such as white, a reflective film can be formed on the inner wall of the lamp cover 5, or the inner wall of the lamp cover 5 can be curved. By providing the lamp cover 5 with a reflector function, the utilization efficiency of the ultraviolet rays emitted from the discharge lamp 4 can be improved.

The lighting circuit 6 is provided, for example, on the surface of the substrate 3 on which the discharge lamp 4 is provided. If the discharge lamp 4 and the lighting circuit 6 are provided on the same side surface of the substrate 3, the thickness dimension T of the housing 2 can be easily reduced. The lighting circuit 6 is electrically connected to the pair of terminal holders 41 using wiring members such as wiring cords and metal plates, for example. Therefore, by attaching the discharge lamp 4 to the pair of terminal holders 41, the lighting circuit 6 and the discharge lamp 4 can be electrically connected.

The lighting circuit 6 applies a driving voltage with a predetermined frequency to the discharge lamp 4 . When a driving voltage is applied to the discharge lamp 4 , for example, a discharge occurs between a pair of electrodes provided on the discharge lamp 4 , and the discharge lamp 4 emits ultraviolet rays.

The lighting circuit 6 is composed of circuit parts such as a switching element, a step-up transformer, and a capacitor. For example, the switching element converts a DC voltage from a vehicle battery into an AC voltage of a predetermined frequency, such as a sine wave voltage. For example, the step-up transformer steps up the voltage from the battery of the vehicle to a predetermined voltage for lighting the discharge lamp 4 . If a sinusoidal voltage is used, the amount of electromagnetic noise generated can be reduced. Further, it is preferable that the frequency of the sine wave voltage is, for example, about 100 kHz to 300 kHz.

The lighting circuit 6 may be any circuit as long as it can generate a driving voltage with a predetermined frequency. The lighting circuit 6 can be, for example, various resonant inverters.

The lighting circuit 6 is electrically connected to the wiring 61, for example. For example, as shown in FIGS. 1 and 3, one end of the wiring 61 is drawn out of the housing 2 . The wiring 61 can be a so-called three-core cable. For example, the electric wire 61a of the wiring 61 electrically connects the positive side of the lighting circuit 6 and the positive side of the battery of the vehicle. For example, the electric wire 61b of the wiring 61 electrically connects the negative side of the lighting circuit 6 and the negative side of the battery of the vehicle. The wire 61b can be a common wire. The electric wire 61c of the wiring 61 electrically connects the shield 8 and the ground of the vehicle (for example, the vehicle body frame). Alternatively, the shield 8 may be brought into direct contact with the ground of the vehicle. In this case, the electric wire 61c can be omitted.

The window 7 is provided in a portion of the housing 2 (second portion 22) where the hole 22a is provided. For example, window 7 is provided in the inner wall of second portion 22 and covers hole 22a. The window 7 is provided with a plurality of openings. The window 7 has a plurality of openings through which the ultraviolet rays emitted from the discharge lamp 4 can pass. If the window 7 is provided, the ultraviolet rays emitted from the discharge lamp 4 can be irradiated to the outside of the housing 2, and the entry of human fingers, foreign objects, etc. into the housing 2 can be suppressed. can do.

FIGS. 4A to 4D are schematic plan views for illustrating forms of windows.
As shown in FIG. 4(a), the window 7a can be formed by arranging a plurality of linear members in a grid pattern.
As shown in FIG. 4(b), the window 7b can be formed by arranging a plurality of linear members in a mesh pattern.
The windows 7a and 7b can be formed, for example, by etching, or by weaving a plurality of wires. When the windows 7a and 7b are formed by etching, a frame portion surrounding a plurality of linear members can be provided.

As shown in FIG. 4(c), the window 7c can be formed by arranging a plurality of linear members in one direction. The window 7c can be formed by etching, for example. When the window 7c is formed by etching, a frame portion surrounding a plurality of linear members can be provided.
As shown in FIG. 4(d), the window 7d can be a plate material having a plurality of openings (holes). The window 7d can be formed by etching or pressing, for example.

If discharge occurs between the electrodes of the discharge lamp 4 when the discharge lamp 4 is turned on, electromagnetic waves may be radiated together with ultraviolet rays. Further, when the discharge lamp 4 is lit, electromagnetic waves may be radiated from the switching element provided in the lighting circuit 6 and the wiring electrically connected to the switching element.

In addition to the vehicle ultraviolet irradiation device 1, the vehicle is provided with electronic devices used for operation of the vehicle. In this case, the vehicle ultraviolet irradiation device 1 and the electronic device are installed in a narrow space such as a vehicle interior, so the distance between the vehicle ultraviolet irradiation device 1 and the electronic device tends to be short. Therefore, when electromagnetic waves generated by the discharge lamp 4 and the lighting circuit 6 provided inside the housing 2 are radiated to the outside of the housing 2, electronic devices provided near the vehicle ultraviolet irradiation device 1 may electromagnetic waves may be incident on the When an electromagnetic wave enters an electronic device, it may become electromagnetic wave noise and cause malfunction of the electronic device.
Therefore, the shield 8 is provided in the vehicle ultraviolet irradiation device 1 according to the present embodiment.

The shield 8 prevents electromagnetic waves generated inside the housing 2 from radiating to the outside of the housing 2 . The shield effect is related to the reflection loss, absorption loss, and multiple reflection loss in the shield 8, but the shield effect in shielding electromagnetic waves is dominated by the reflection loss.

That is, by increasing the reflection loss in the shield 8 , it is possible to effectively suppress the electromagnetic waves generated inside the housing 2 from radiating to the outside of the housing 2 . In this case, the reflection coefficient of the shield 8 should be increased in order to increase the reflection loss. In order to increase the reflection coefficient of the shield 8, the impedance of the shield 8 should be lowered.

For example, a conductive shield 8 may be used. In this case, if the shield 8 is made of a highly conductive material such as metal, the reflection loss in the shield 8 can be increased, and the radiation of electromagnetic waves to the outside of the housing 2 can be effectively prevented. can be suppressed.

The shield 8 can be, for example, a plate material or film containing a conductive material, a conductive paint containing a conductive filler, a plated layer or a deposited layer having conductivity, or the like. A plate or film containing a conductive material can be bonded to the housing 2 using, for example, an adhesive or double-sided tape. A plate material containing a conductive material can also be integrally molded with the housing 2 using, for example, an insert molding method. A conductive paint can be applied to the housing 2, for example. A conductive plating layer can be provided on the surface of the housing 2 by, for example, an electroless plating method. A vapor deposition layer having conductivity can be provided on the surface of the housing 2 by, for example, a sputtering method.
The electrically conductive material can be, for example, a metal such as aluminum, copper, nickel, carbon steel. In this case, it is more preferable to use a highly conductive metal such as aluminum or copper.

The shield 8 can be provided on at least one of the outer wall of the housing 2 and the inner wall of the housing 2, for example. In this case, if the shield 8 is provided on the outer wall of the housing 2 and the inner wall of the housing 2, the shielding effect can be enhanced.

However, the discharge lamp 4 , the terminal holder 41 , the lighting circuit 6 and the like are provided inside the housing 2 . Therefore, if a conductive shield 8 is provided on the inner wall of the housing 2, it is necessary to ensure insulation between the shield 8 and the discharge lamp 4 or the like. For example, an insulation distance is secured between the shield 8 provided on the inner wall of the housing 2 and the discharge lamp 4 or the like, or between the shield 8 provided on the inner wall of the housing 2 and the discharge lamp 4 or the like. An insulating member such as an insulating sheet can be inserted into the .

However, by doing so, the thickness dimension T of the housing 2 is increased, and the weight of the vehicle ultraviolet irradiation device 1 is increased. As described above, the vehicular ultraviolet irradiation device 1 is often installed in a narrow space such as a vehicle interior together with electronic devices used for operation of the vehicle. Therefore, when the thickness dimension T of the housing 2 increases or the weight of the vehicle ultraviolet irradiation device 1 increases, it may become difficult to install the vehicle ultraviolet irradiation device 1 .

Therefore, as shown in FIGS. 2 and 3, the shield 8 can be provided on the outer wall of the housing 2. FIG. In this way, the distance between the insulating inner wall of the housing 2 and the discharge lamp 4, the terminal holder 41, the lighting circuit 6, and the like can be shortened. can be easily reduced. The shield 8 provided on the outer wall of the housing 2 is electrically connected to the ground of the vehicle via the electric wire 61c of the wiring 61, for example.

Here, when the housing 2 is divided, a shield is provided for each of a plurality of portions of the housing 2 . For example, as shown in FIGS. 1 to 3, when the housing 2 has a first portion 21 and a second portion 22, the outer wall of the first portion 21 is provided with a shield 8a (first shield). ) is provided, and the outer wall of the second portion 22 is provided with the shield 8b (corresponding to one example of the second shield).

Here, if any one of the shields provided in each of the plurality of parts of the housing 2 is not electrically connected to the ground of the vehicle, the shield effect of the shield will be reduced. In this case, if the electric wire 61c of the wiring 61 is electrically connected to all of the plurality of shields, the wiring work may become complicated, or the disassembly of the housing 2 may become difficult.

Therefore, when the housing 2 is divided, the shields provided in the divided portions of the housing 2 are electrically connected to each other at the connection portion between the divided portions of the housing 2. I'm trying to

FIG. 5 is a schematic enlarged view of the C portion in FIG.
As shown in FIG. 5, when the housing 2 has the first portion 21 and the second portion 22, the connection portion 2a between the first portion 21 and the second portion 22 has the first A shield 8a provided on the outer wall of the portion 21 and a shield 8b provided on the outer wall of the second portion 22 are in contact with each other. For example, the shield 8a can be provided at the opening-side end of the first portion 21, and the shield 8b can be provided at the opening-side end of the second portion 22 as well.

By doing so, the shield 8a and the shield 8b can be electrically connected. Therefore, since the shield 8a and the shield 8b can be electrically connected to the vehicle ground, it is possible to prevent the shield effect from being reduced.

The first portion 21 is provided with the substrate 3, the pair of terminal holders 41, the lighting circuit 6, and the like. Therefore, it is preferable to electrically connect the electric wire 61 c of the wiring 61 to the shield 8 a provided on the first portion 21 . In this way, attachment and detachment of the second portion 22 is facilitated.

Here, as described above, the window 7 is provided with a plurality of openings through which the ultraviolet rays emitted from the discharge lamp 4 are transmitted. Therefore, electromagnetic waves may be radiated to the outside of the housing 2 through the plurality of openings provided in the window 7 . In this case, if a shield 8 is provided on the outer surface of the window 7 , the ultraviolet rays will not be emitted to the outside of the housing 2 .

Therefore, the window 7 is assumed to be conductive. For example, window 7 is made of a conductive material. The conductive material can be, for example, the same conductive material used for shield 8 . In this case, if the conductive material is metal, resistance to ultraviolet rays emitted from the discharge lamp 4 can be enhanced.

If the window 7 is conductive, it is possible to increase the reflection loss at the window 7 as in the case of the shield 8 described above. can be suppressed.

Here, if the opening ratio of the plurality of openings provided in the window 7 is reduced, the effect of shielding electromagnetic waves is increased, but it becomes difficult for ultraviolet rays to pass through the window 7 . If the aperture ratio of the plurality of openings provided in the window 7 is increased, the ultraviolet rays can easily pass through the window 7, but the effect of shielding the electromagnetic wave is reduced.

In this case, the aperture ratio of the plurality of openings provided in the window 7 can be appropriately selected within the range of 10% or more and 90% or less. For example, the aperture ratio of the plurality of apertures can be changed according to the distance between the vehicle ultraviolet irradiation device 1 and the electronic device used for driving the vehicle. For example, when the distance between the vehicle ultraviolet irradiation device 1 and the electronic device is long, the irradiation amount of ultraviolet rays can be increased by increasing the aperture ratio of the plurality of openings. For example, when the distance between the vehicle ultraviolet irradiation device 1 and the electronic device is short, or the noise resistance of the electronic device is low, the aperture ratio of the plurality of openings can be reduced.
The aperture ratio of the plurality of openings provided in the window 7 is "(the total area of the plurality of openings/the area of the window 7) x 100".

Also, as with the shield 8 described above, if the window 7 is not electrically connected to the ground of the vehicle, the shielding effect of the window 7 will be reduced. In this case, if the electric wire 61c of the wiring 61 is electrically connected to the shield 8 and the window 7, the wiring work may become complicated, and the disassembly of the housing 2 may become difficult. Therefore, the window 7 is electrically connected to the shield 8 provided on the housing 2 .

FIG. 6 is a schematic enlarged view of part D in FIG.
As shown in FIG. 6, the shield 8 (shield 8b) can also be provided around the hole 22a, which is the inner wall of the housing 2 (second portion 22), for emitting ultraviolet rays.

In this way, the shield 8 (shields 8b, 8a) and the window 7 can be electrically connected. Therefore, the window 7 can be electrically connected to the ground of the vehicle via the shield 8 (shields 8b, 8a). As a result, it is possible to prevent the shielding effect of the window 7 from being reduced.

Alternatively, the window 7 and the shield 8 (shield 8b) can be connected using a fastening member such as a screw or a conductive tape. In this way, the connection between the window 7 and the shield 8 (shield 8b) becomes stronger, so it is possible to suppress the disconnection between the window 7 and the shield 8 (shield 8b) due to vibration due to running or the like. can be done.

Although some embodiments of the present invention have been illustrated above, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, etc. can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof. Moreover, each of the above-described embodiments can be implemented in combination with each other.

1 vehicle ultraviolet irradiation device, 2 housing, 2a connection part, 3 substrate, 4 discharge lamp, 5 lamp cover, 6 lighting circuit, 7 window, 7a to 7d window, 8 shield, 8a shield, 8b shield, 21 first part, 22 second part, 22a hole

Claims (5)

a discharge lamp capable of irradiating ultraviolet rays;
a lighting circuit capable of applying a driving voltage of a predetermined frequency to the discharge lamp;
a housing having a box shape and containing therein the discharge lamp and the lighting circuit;
a conductive shield provided on at least one of the outer wall of the housing and the inner wall of the housing;
A vehicle ultraviolet irradiation device comprising: The housing has a first portion and a second portion detachably attached to the first portion,
A conductive first shield is provided on the outer wall of the first portion,
A conductive second shield is provided on the outer wall of the second portion,
2. The ultraviolet irradiation for vehicles according to claim 1, wherein said first shield and said second shield are electrically connected at a connecting portion between said first portion and said second portion. Device. the second portion has a hole facing the discharge lamp;
3. The ultraviolet irradiation device for a vehicle according to claim 2, further comprising a window having conductivity, covering the hole, and having a plurality of openings through which the ultraviolet rays emitted from the discharge lamp can pass. 4. The vehicle ultraviolet irradiation device according to claim 3, wherein the window is electrically connected to the second shield. 5. The vehicle ultraviolet irradiation device according to claim 3, wherein the window has an aperture ratio of 10% or more and 90% or less.

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