JP2023061437A - Vehicle ultraviolet rays lamp - Google Patents

Abstract

To provide a vehicle ultraviolet ray discharge lamp capable of suppressing generation of a leakage current in an electrical connection between a discharge lamp and a lighting circuit, and capable of aiming to improve productivity.SOLUTION: A vehicle ultraviolet rays lamp includes a discharge lamp capable of radiating ultraviolet rays; a terminal holder to which the discharge lamp is mounted; a lamp cover housing the discharge lamp and the terminal holder inside and having an opening at one end; a lighting circuit capable of outputting a driving voltage of a predetermined frequency; a conductive member having a plate shape and electrically connecting the terminal holder and the lighting circuit; and a housing that has a box shape and accommodates the discharge lamp, the terminal holder, the lamp cover, the lighting circuit, and the conductive member inside.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, in some cases, a vehicle ultraviolet irradiation device is provided with a discharge lamp and a lighting circuit that applies a driving voltage of a predetermined frequency to the discharge lamp. Generally, a discharge lamp and a lighting circuit are electrically connected by an electric wire. However, when the discharge lamp and the lighting circuit are electrically connected by an electric wire, the length of the electric wire becomes long, which may easily cause leakage current or radiate electromagnetic waves. Furthermore, the electric wire that electrically connects the discharge lamp and the lighting circuit is required to have resistance to high voltage and ultraviolet rays. Such a special electric wire has a long delivery time and a high price. Therefore, this has been a factor in reducing the productivity of the vehicle ultraviolet irradiation device.
Therefore, it has been desired to develop an ultraviolet irradiation device for vehicles that can suppress the occurrence of leakage current in the electrical connection between the discharge lamp and the lighting circuit and can improve productivity.

JP 2009-195825 A

A problem to be solved by the present invention is to provide an ultraviolet irradiation device for a vehicle that can suppress the occurrence of leakage current in the electrical connection between a discharge lamp and a lighting circuit and can improve productivity. is to provide

A vehicle ultraviolet irradiation device according to an embodiment includes a discharge lamp capable of irradiating ultraviolet rays; a terminal holder to which the discharge lamp is mounted; a lamp cover having an opening at one end; a lighting circuit capable of outputting a driving voltage of a predetermined frequency; a conductive member having a plate shape and electrically connecting the terminal holder and the lighting circuit; and a housing that accommodates the discharge lamp, the terminal holder, the lamp cover, the lighting circuit, and the conductive member inside;

According to an embodiment of the present invention, there is provided an ultraviolet irradiation device for a vehicle that can suppress the occurrence of leakage current in the electrical connection between a discharge lamp and a lighting circuit and can improve productivity. can provide.

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. 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; FIG. 3 is a schematic cross-sectional view for illustrating a vehicle ultraviolet irradiation device according to another embodiment. FIG. 3 is a schematic cross-sectional view for illustrating a vehicle ultraviolet irradiation device according to another embodiment.

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 includes, for example, a housing 2, a substrate 3, a discharge lamp 4, a lamp cover 5, a lighting circuit 6, a window 7, a shield 8, and a conductive member 9. is provided.

The housing 2 has a box-like shape and has a space inside for housing the substrate 3, the discharge lamp 4, the terminal holder 41, the lamp cover 5, the lighting circuit 6, the conductive member 9, and the like. 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, the board 3, the discharge lamp 4, the terminal holder 41, the lamp cover 5, the lighting circuit 6, and the conductive member are arranged inside the housing 2. 9 etc. can be attached easily.

For example, housing 2 can have a first portion 21 and a second portion 22 .
The first portion 21 can be, for example, a base to which the substrate 3, the discharge lamp 4, the lamp cover 5, the lighting circuit 6, the conductive member 9, etc. are attached.

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 , the substrate 3 , the discharge lamp 4 , the terminal holder 41 , the lighting circuit 6 , the conductive member 9 and the like are provided inside the housing 2 . 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 is detachably attached to a pair of terminal holders 41 . A pair of terminal holders 41 can be provided on the bottom surface of the lamp cover 5, 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 shape and has an opening 5a at one end. 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 accommodated. 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 side 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 of the substrate 3, the thickness dimension T of the housing 2 can be easily reduced. As will be described later, the lighting circuit 6 and the terminal holder 41 are electrically connected via the conductive member 9 . Therefore, by attaching the discharge lamp 4 to the terminal holder 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 transformer 62, a switching element 63, and a capacitor. For example, the transformer 62 boosts the voltage input from the battery of the vehicle to a predetermined voltage for lighting the discharge lamp 4 . For example, the switching element 63 converts a DC voltage from a vehicle battery into an AC voltage of a predetermined frequency, such as a sine wave voltage. 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 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.

As shown in FIG. 1, the window 7 can be formed by arranging a plurality of linear members in a lattice.
Moreover, the window 7 can also be formed by arranging a plurality of linear members in a mesh pattern. The window 7 can also be made by arranging a plurality of linear members in one direction. Such windows 7 can be formed by etching, for example. When the window 7 is formed by etching, a frame portion surrounding a plurality of linear members can be provided. Also, the grid-like or mesh-like window 7 can be formed by weaving a plurality of wires.
Also, the window 7 can be a plate material having a plurality of openings (holes). Such windows 7 can be formed by, for example, etching or pressing.

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 63 provided in the lighting circuit 6 and the wiring electrically connected to the switching element 63 .

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, a discharge lamp 4 , a terminal holder 41 , a lighting circuit 6 and a conductive member 9 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, in order to reduce the thickness of the vehicle ultraviolet irradiation device 1, it is preferable to provide the shield 8 on the outer wall of the housing 2, as shown in FIGS. If the shield 8 is provided on the outer wall of the housing 2, the distance between the insulating inner wall of the housing 2, the discharge lamp 4, the terminal holder 41, the lighting circuit 6, the conductive member 9, and the like can be shortened. Therefore, it becomes easy to reduce the thickness dimension T of the housing 2 . 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. The shield 8 provided on the outer wall of the housing 2 may be brought into direct contact with the ground of the vehicle.

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).

If any of the shields provided on each of the plurality of housing 2 portions is not electrically connected to the ground of the vehicle, the shielding 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

4 is a schematic enlarged view of the C portion in FIG. 2. FIG.
As shown in FIG. 4, 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.

Also, the substrate 3 , the terminal holder 41 , the lighting circuit 6 and the conductive member 9 are provided in the first portion 21 . 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 (shield 8b) provided on the housing 2 (second portion 22).

FIG. 5 is a schematic enlarged view of part D in FIG.
As shown in FIG. 5, 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.

As shown in FIGS. 2 and 3, a pair of conductive members 9 can be provided. The pair of conductive members 9 are provided on the side of the substrate 3 opposite to the side on which the terminal holders 41 are provided. Each of the pair of conductive members 9 electrically connects the terminal holder 41 and the lighting circuit 6 . Each of the pair of conductive members 9 is electrically connected to the terminal holder 41 and the lighting circuit 6 via a fastening member such as a conductive screw. Each of the pair of conductive members 9 is plate-shaped and has conductivity. Each of the pair of conductive members 9 is preferably made of a highly conductive metal such as copper or copper alloy.

Here, if a pair of wires are used to electrically connect the terminal holder 41 and the lighting circuit 6, the length of the wires tends to be long. Further, as described above, the lighting circuit 6 applies a driving voltage having a high frequency and a high voltage to the discharge lamp 4 . Therefore, if the terminal holder 41 and the lighting circuit 6 are electrically connected using a pair of wires, leakage current is likely to occur between the wires. When leakage current occurs, the luminous efficiency of the discharge lamp 4 decreases. Further, when the length of the wiring is long, electromagnetic waves are likely to be radiated from the wiring when the discharge lamp 4 is turned on. Furthermore, the electric wire that electrically connects the discharge lamp 4 and the lighting circuit 6 is required to have resistance to high voltage and ultraviolet rays. Such a special electric wire has a long delivery time and a high price. Therefore, if the terminal holder 41 and the lighting circuit 6 are electrically connected by using a pair of wires, it becomes a factor of lowering the productivity of the vehicle ultraviolet irradiation device.

In the vehicle ultraviolet irradiation device 1 according to the present embodiment, the terminal holder 41 and the lighting circuit 6 are electrically connected using a pair of plate-shaped conductive members 9 . Therefore, it becomes easy to shorten the length of the conductive member 9, so that the occurrence of leakage current in the electrical connection between the discharge lamp 4 and the lighting circuit 6 can be suppressed. If the generation of leakage current can be suppressed, the luminous efficiency of the discharge lamp 4 can be improved.

In this case, as shown in FIG. 3, the distance L between the transformer 62 and the connection position between the terminal holder 41 and the conductive member 9 is preferably 10 mm or less. If the distance L is 10 mm or less, it is possible to further suppress the occurrence of leakage current. As a result, the luminous efficiency of the discharge lamp 4 can be further improved.

Further, since the plate-shaped conductive member 9 can be easily manufactured by sheet metal processing or the like, productivity can be improved.

FIG. 6 is a schematic cross-sectional view for illustrating a vehicle ultraviolet irradiation device 1a according to another embodiment.
As shown in FIG. 6, the vehicle ultraviolet irradiation device 1a includes, for example, a housing 2, a substrate 3, a discharge lamp 4, a lamp cover 5, a lighting circuit 6, a window 7, a shield 8, a conductive member 9, a spacer 10, and a covering portion 11 are provided. For example, the vehicle ultraviolet irradiation device 1a may be the vehicle ultraviolet irradiation device 1 further provided with a spacer 10 and a covering portion 11 .

A plurality of spacers 10 are provided. A plurality of spacers 10 are provided between the substrate 3 and the lamp cover 5 . Spacer 10 forms a gap between substrate 3 and lamp cover 5 . A fastening member such as a screw is inserted into the spacer 10 . The fastening member fixes the spacer 10 and the lamp cover 5 to the substrate 3 .
A gap can be provided between the substrate 3 and the lamp cover 5 if the spacer 10 is provided. Therefore, the heat generated in the discharge lamp 4 can be suppressed from being transferred to the substrate 3 through the lamp cover 5 . As a result, it is possible to prevent the outer wall of the housing 2 from becoming hot and the lighting circuit 6 from deteriorating.

The covering portion 11 has insulating properties and covers the transformer 62 . The covering portion 11 can be formed, for example, by supplying an insulating resin so as to cover the transformer 62 and curing the resin. For example, the covering portion 11 can be formed by potting or the like.

As described above, it is preferable to shorten the distance L between the transformer 62 and the connection position between the terminal holder 41 and the conductive member 9 . However, in order to insulate between the transformer 62 and the terminal holder 41 , it is necessary to secure a creepage distance and a spatial distance between the transformer 62 and the terminal holder 41 . In this case, the distance between the transformer 62 and the terminal holder 41 can be shortened if the covering portion 11 that has insulating properties and covers the transformer 62 is provided. Therefore, it becomes easy to set the above-described distance L to 10 mm or less, so that it is possible to further effectively suppress the occurrence of leakage current. As a result, the luminous efficiency of the discharge lamp 4 can be improved more effectively.

FIG. 7 is a schematic cross-sectional view for illustrating a vehicle ultraviolet irradiation device 1b according to another embodiment.
As shown in FIG. 7, the vehicle ultraviolet irradiation device 1b includes, for example, a housing 2, a substrate 3, a discharge lamp 4, a lamp cover 5, a lighting circuit 6, a window 7, a shield 8, a conductive member 9, and a covering portion 11. , and a connecting portion 12 are provided. For example, the vehicle ultraviolet irradiation device 1b may be the vehicle ultraviolet irradiation device 1 further provided with the covering portion 11 and the connection portion 12 .

The connecting portion 12 has conductivity, electrically connects the conductive member 9 and the terminal holder 41 , and forms a gap between the substrate 3 and the lamp cover 5 . A plurality of connection portions 12 are provided. The connecting portion 12 has a plate-like base, for example, and is electrically connected to the terminal holder 41 . The connecting portion 12 has a plate-like shape and has a leg portion whose one end is connected to the peripheral edge of the base and whose other end is electrically connected to the conductive member 9 . A pair of legs illustrated in FIG. 7 are provided. The base and legs can be integrally formed by sheet metal processing or the like. The base of the connecting portion 12 can be connected to the lamp cover 5 and the terminal holder 41 using a fastening member such as a conductive screw. The legs of the connecting portion 12 can be laser welded to the conductive member 9, for example.

A gap can be provided between the substrate 3 and the lamp cover 5 if the connecting portion 12 is provided. Therefore, heat generated in the discharge lamp 4 can be suppressed from being transferred to the substrate 3 via the lamp cover 5 . As a result, it is possible to prevent the outer wall of the housing 2 from becoming hot and the lighting circuit 6 from deteriorating.
Moreover, the conductive member 9 and the terminal holder 41 can be electrically connected with a simple configuration. Therefore, the manufacturing cost of the vehicle ultraviolet irradiation device 1b can be reduced.

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 UV irradiation device for vehicle, 1a UV irradiation device for vehicle, 1b UV irradiation device for vehicle, 2 Housing, 2a Connection portion, 3 Board, 4 Discharge lamp, 5 Lamp cover, 5a Opening, 6 Lighting circuit, 7 Window, 8 shield, 8a shield, 8b shield, 9 conductive member, 10 spacer, 11 covering portion, 12 connection portion, 21 first portion, 22 second portion, 41 terminal holder, 62 transformer

Claims (6)

a discharge lamp capable of irradiating ultraviolet rays;
a terminal holder to which the discharge lamp is mounted;
a lamp cover housing the discharge lamp and the terminal holder therein and having an opening at one end;
a lighting circuit capable of outputting a driving voltage of a predetermined frequency;
a plate-shaped conductive member for electrically connecting the terminal holder and the lighting circuit; a box-shaped conductive member containing the discharge lamp, the terminal holder, the lamp cover, the lighting circuit, and the , a housing that houses the conductive member;
A vehicle ultraviolet irradiation device comprising: The lighting circuit has a transformer that boosts the input voltage to a predetermined voltage for lighting the discharge lamp,
2. The vehicle ultraviolet irradiation device according to claim 1, wherein the distance between the transformer and the connection position between the terminal holder and the conductive member is 10 mm or less. 3. The vehicle ultraviolet irradiation device according to claim 2, further comprising a covering portion having insulating properties and covering the transformer. a plate-like substrate;
a spacer forming a gap between the substrate and the lamp cover;
further comprising
one side of the substrate is provided with the conductive member;
The vehicle ultraviolet light according to any one of claims 1 to 3, wherein the lamp cover, the lighting circuit, and the spacer are provided on a side of the substrate opposite to the side on which the conductive member is provided. Irradiation device. a plate-like substrate;
a connection part that has conductivity, electrically connects the conductive member and the terminal holder, and forms a gap between the substrate and the lamp cover;
further comprising
The connecting part is
a plate-shaped base electrically connected to the terminal holder;
a plate-shaped leg having one end connected to the periphery of the base and the other end electrically connected to the conductive member;
The vehicle ultraviolet irradiation device according to any one of claims 1 to 3. 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,
6. The first shield and the second shield are electrically connected at a connecting portion between the first portion and the second portion. 1. The vehicle ultraviolet irradiation device according to 1.

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