JP2024076160A - Vehicular ultraviolet irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular ultraviolet irradiation device capable of inhibiting an arrival of generated electromagnetic waves to an electronic device.

SOLUTION: A vehicular ultraviolet irradiation device in an embodiment includes: a discharge lamp capable of irradiation with ultraviolet ray; a housing that has insulation properties and stores the discharge lamp; a shield that has electrical conductivity and is disposed on an external wall of the housing; and a plurality of insulating parts disposed on the external wall of the housing. The shield is not disposed on a top surface of each of the plurality of insulating parts.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

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

There are ultraviolet irradiation devices equipped with discharge lamps that irradiate ultraviolet rays. In recent years, reflecting the growing health consciousness, ultraviolet irradiation devices have come to be used for sterilizing bacteria and inactivating viruses attached to the surfaces of objects. In addition, to prevent infection, there is an increasing demand for purifying the atmosphere inside the vehicle and the surfaces of objects inside relatively small closed spaces such as the interior of an automobile or train car.

Here, when the discharge lamp is turned on, electromagnetic waves are emitted along with ultraviolet light. Furthermore, when the ultraviolet light irradiation device is a vehicle ultraviolet light irradiation device installed in a vehicle such as an automobile or train, the vehicle ultraviolet light irradiation device is often installed together with electronic devices used for operating the vehicle in a small space such as the interior of the vehicle.

Therefore, the distance between the vehicle ultraviolet irradiation device and the electronic device may become short, and the electromagnetic waves emitted from the vehicle ultraviolet irradiation device may easily reach the electronic device. If the electromagnetic waves reach the electronic device, they may become electromagnetic noise and cause the electronic device to malfunction.
Therefore, there has been a demand for the development of an ultraviolet ray irradiation device for vehicles that can prevent the generated electromagnetic waves from reaching electronic devices.

JP 2009-195825 A

The problem that this invention aims to solve is to provide an ultraviolet irradiation device for vehicles that can prevent the generated electromagnetic waves from reaching electronic devices.

The ultraviolet irradiation device for vehicles according to the embodiment includes a discharge lamp capable of irradiating ultraviolet rays; an insulating housing that houses the discharge lamp; a conductive shield that is provided on the outer wall of the housing; and a plurality of insulating parts that are provided on the outer wall of the housing. The shield is not provided on the top surfaces of the plurality of insulating parts.

According to an embodiment of the present invention, it is possible to provide an ultraviolet irradiation device for a vehicle that can prevent the generated electromagnetic waves from reaching electronic devices.

1 is a schematic plan view of an ultraviolet ray irradiation device for a vehicle according to an embodiment of the present invention, as viewed from the side from which ultraviolet rays are emitted. 2 is a schematic cross-sectional view of the ultraviolet ray irradiation device for a vehicle in the direction of line AA in FIG. 1. 2 is a schematic plan view of the vehicle ultraviolet irradiation device as viewed from the side opposite to the side from which ultraviolet rays are emitted. FIG. 1A and 1B are schematic plan views illustrating electrical connection between a ground pattern of a substrate and a shield. 10 is a schematic perspective view illustrating how wiring is drawn out from a housing. FIG. 13 is a schematic perspective view illustrating an ultraviolet irradiation device for a vehicle according to another embodiment. FIG. 7 is a schematic cross-sectional view of the ultraviolet ray irradiation device for a vehicle in the direction of line BB in FIG. 6. 13 is a schematic perspective view illustrating an ultraviolet irradiation device for a vehicle according to another embodiment. FIG. 9 is a schematic cross-sectional view of the ultraviolet irradiation device for a vehicle in FIG. 8 taken along line CC.

Hereinafter, an embodiment will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.
The ultraviolet ray irradiation device for vehicles according to the present embodiment can be installed in vehicles such as automobiles and trains. For example, the ultraviolet ray irradiation device for vehicles can be installed in the passenger compartment or trunk of an automobile, or in the passenger compartment of a train. However, the installation location of the ultraviolet ray irradiation device for vehicles is not limited to the example given.

FIG. 1 is a schematic plan view of an ultraviolet ray irradiation device 1 for a vehicle according to the present embodiment, as viewed from the side from which ultraviolet rays are emitted.
FIG. 2 is a schematic cross-sectional view of the ultraviolet irradiation device 1 for a vehicle taken along line AA in FIG.
FIG. 3 is a schematic plan view of the vehicle ultraviolet irradiation device 1 as viewed from the side opposite to the side from which ultraviolet rays are emitted.
As shown in FIGS. 1 to 3, an ultraviolet ray irradiation device 1 for a vehicle includes, 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.

The housing 2 is box-shaped and has space therein 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, substantially rectangular. However, the planar shape of the housing 2 can be changed as appropriate depending on the space in which the vehicle ultraviolet irradiation device 1 is installed. For example, the planar shape of the housing 2 can be a shape composed of curves such as a circle or an ellipse, or a shape composed of curves and straight lines. The thickness dimension T of the housing 2 can be smaller than the planar dimension of the housing 2. If the thickness dimension T of the housing 2 is made smaller, it becomes easier to install electronic devices used for driving the vehicle and the vehicle ultraviolet irradiation device 1 together.

The housing 2 can also be divided into multiple parts. For example, as shown in FIG. 2, the housing 2 can be divided into two parts in the thickness direction of the housing 2. If the housing 2 is divided into two parts in the thickness direction of the housing 2, it becomes easier to attach the board 3, discharge lamp 4, lamp cover 5, and lighting circuit 6 inside the housing 2.

For example, the housing 2 can be divided into a first portion 21 and a second portion 22. The first portion 21 serves as a base on which the substrate 3, the discharge lamp 4, the lamp cover 5, and the lighting circuit 6 are attached.

The second part 22 serves, for example, as a cover that covers the opening side of the first part 21. The second part 22 may be provided with a hole 22a for emitting ultraviolet light. The hole 22a is provided in a position facing the discharge lamp 4.

The second part 22 is detachably attached to the first part 21. For example, the second part 22 can be detachably attached to the first part 21 by using an elastic force. For example, the second part 22 can be detachably attached to the first part 21 by using a fastening member such as a screw. The first part 21 and the second part 22 illustrated in Figures 1 and 2 are detachably connected by an elastic force generated by fitting the opening parts together.

The second part 22 can also be fixed to the first part 21 using an adhesive or the like. However, if the second part 22 is detachably attached to the first part 21, maintenance such as replacing the discharge lamp 4 becomes easier.

Inside the housing 2, the substrate 3, the discharge lamp 4, and the lighting circuit 6 are provided. Therefore, if the housing 2 (first part 21 and second part 22) is made of a metal such as an aluminum alloy, there is a risk of electrical leakage or short circuit occurring between the housing 2 and the substrate 3, the discharge lamp 4, and the lighting circuit 6. For this reason, it is preferable to form the housing 2 from an insulating resin. Furthermore, forming the housing 2 from an insulating resin can reduce the weight and manufacturing costs of the vehicle ultraviolet irradiation device 1. The material of the second part 22 may be the same as the material of the first part 21, or it may be different.

The substrate 3 has a plate shape. The substrate 3 can be provided, for example, on a plurality of protrusions 21a provided on the inner wall of the first portion 21. There are no particular limitations on the material of the substrate 3. The substrate 3 can be formed, for example, from ceramics such as aluminum oxide or aluminum nitride, or organic materials such as paper phenol or glass epoxy. The substrate 3 may also be a metal core substrate in which the surface of a metal plate is coated with an insulating material.

A ground pattern (solid ground) can be provided on the surface of the substrate 3 opposite to the surface on which the discharge lamp 4 and the lighting circuit 6 are provided (the surface on the first portion 21 side). The ground pattern can also be electrically connected to the shield 8 (shield 8a) described below.

FIG. 4 is a schematic plan view illustrating the electrical connection between the ground pattern of the substrate 3 and the shield 8 (shield 8a).
FIG. 4 is a schematic plan view of the first portion 21 of the housing 2 as viewed from the inside.
As shown in Fig. 4, the plurality of protrusions 21a are provided on the inner wall of the first portion 21. Each of the plurality of protrusions 21a may be provided with an insert (embedded female screw) 21a1 exposed on the top surface of the protrusion 21a. The substrate 3 is screwed to the insert 21a1 provided on the plurality of protrusions 21a. If the insert 21a1 is provided on the protrusion 21a, even if the protrusion 21a is made of resin, damage to the protrusion 21a due to fastening with the screw can be suppressed.

In addition, a shield 8 (shield 8a) can be provided on at least one of the top surfaces of the multiple protrusions 21a. When the substrate 3 is attached to the multiple protrusions 21a, the ground pattern of the substrate 3 is electrically connected to the shield 8 (shield 8a) provided on the top surface of the protrusion 21a. By electrically connecting the ground pattern of the substrate 3 and the shield 8 (shield 8a), it is possible to improve the electromagnetic wave shielding effect described below.
In this case, it is preferable to provide a shield 8 (shield 8a) on the top surfaces of at least two of the protrusions 21a as shown in Fig. 4. In this way, it is possible to improve the reliability of the electrical connection between the ground pattern of the substrate 3 and the shield 8 (shield 8a).

As shown in FIG. 2, the discharge lamp 4 is provided on the second portion 22 side of the substrate 3. The discharge lamp 4 is located between the substrate 3 and the second portion 22. The discharge lamp 4 is provided in a position facing the hole 22a of the second portion 22. The discharge lamp 4 can be detachably provided on a pair of terminal holders 41. The pair of terminal holders 41 can be provided on the substrate 3, for example. Note that FIG. 2 illustrates an example in which one discharge lamp 4 is provided, but multiple discharge lamps 4 may be provided. It is sufficient that at least one discharge lamp 4 is provided.

There are no particular limitations on the discharge lamp 4 as long as it is capable of emitting ultraviolet rays. The discharge lamp 4 may be, for example, a mercury lamp, a metal halide lamp, or a dielectric barrier discharge lamp.
Here, if the DNA or RNA of bacteria or viruses is absorbed by the ultraviolet light 100, the DNA or RNA of bacteria or viruses can be destroyed. If the DNA or RNA of bacteria or viruses can be destroyed, a high sterilization rate can be obtained. For example, the DNA or RNA of bacteria or viruses easily absorbs the ultraviolet light 100 with a wavelength of about 260 nm. Therefore, it is preferable that the discharge lamp 4 irradiates the ultraviolet light 100 with a peak wavelength of 230 nm or more and 300 nm or less. For example, if the discharge lamp 4 is a hot cathode type low pressure mercury lamp, it can irradiate the ultraviolet light 100 with a peak wavelength of about 254 nm.
The discharge lamp 4 has, for example, a shape that extends in one direction. If the discharge lamp 4 has a shape that extends in one direction, it becomes easy to reduce the thickness dimension T of the housing 2.

The lamp cover 5 is provided on the surface of the substrate 3 on which the discharge lamp 4 is provided. The lamp cover 5 is provided between the substrate 3 and the second part 22. The lamp cover 5 is box-shaped and has an opening at the end opposite the substrate 3. The opening of the lamp cover 5 faces the hole 22a of the second part 22. The discharge lamp 4 and a pair of terminal holders 41 are provided inside the lamp cover 5. For example, the lamp cover 5 is formed from an insulating resin. Here, the lamp cover 5 is exposed to ultraviolet rays irradiated from the discharge lamp 4. For this reason, it is preferable that the material of the lamp cover 5 is a material that is more resistant 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 irradiated from the discharge lamp 4 from entering the inner wall of the housing 2, the substrate 3, and the lighting circuit 6. This makes it possible to prevent these from being deteriorated by the ultraviolet rays.

The lamp cover 5 can also function as a reflector. For example, the lamp cover 5 can be made of white resin, 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. Giving the lamp cover 5 the function of a reflector can improve the efficiency of use of the ultraviolet light irradiated from the discharge lamp 4.

The lighting circuit 6 is housed inside the housing 2. The lighting circuit 6 is provided on the surface of the substrate 3 on which the discharge lamp 4 is provided. In this manner, it is easy to reduce the thickness dimension T of the housing 2. The lighting circuit 6 is electrically connected to the vehicle battery, for example, via wiring 61.

The lighting circuit 6 is electrically connected to a pair of terminal holders 41 via wiring members such as a wiring cord or a metal plate. 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 drive voltage of a predetermined frequency to the discharge lamp 4. When the drive 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 ultraviolet rays are emitted from the discharge lamp 4.

The lighting circuit 6 converts, for example, DC voltage from the vehicle battery into AC voltage of a predetermined frequency, such as a sine wave voltage. Using a sine wave voltage can reduce the amount of electromagnetic noise generated. The frequency of the sine wave voltage can be, for example, about 100 kHz to 300 kHz. The lighting circuit 6 can be, for example, any of a variety of resonant type inverters.

The window 7 faces the hole 22a of the housing 2 (second part 22). For example, the window 7 covers the hole 22a. The window 7 is plate-shaped and has multiple openings 7a (holes) that penetrate in the thickness direction. The ultraviolet rays irradiated from the discharge lamp 4 are irradiated to the outside of the vehicle ultraviolet irradiation device 1 through the multiple openings 7a.

Here, when the discharge lamp 4 is turned on, if a discharge occurs between the electrodes of the discharge lamp 4, electromagnetic waves may be emitted along with ultraviolet rays. Also, when the discharge lamp 4 is turned on, electromagnetic waves may be emitted from the inverter provided in the lighting circuit 6.

Therefore, the window 7 is conductive. The material of the window 7 can be, for example, a metal such as aluminum, copper, nickel, stainless steel, or carbon steel. In this case, if the window 7 is formed using a metal with high conductivity such as aluminum or copper, the reflection loss described below can be increased, and the transmission of electromagnetic waves can be effectively suppressed. In addition, if the window 7 is formed using stainless steel or the like, the rigidity of the window 7 can be increased.

The smaller the aperture ratio of the multiple openings 7a, the greater the effect of suppressing the transmission of electromagnetic waves. On the other hand, the smaller the aperture ratio of the multiple openings 7a, the less likely ultraviolet rays are to pass through the window 7. For this reason, it is preferable that the aperture ratio of the multiple openings 7a is, for example, 10% or more and 90% or less. The aperture ratio of the multiple openings 7a provided in the window 7 is "(total area of the multiple openings 7a/area of the window 7) x 100".

The planar shape of the multiple openings 7a can be a polygon of the same size that can be filled in a plane. In this way, it is easy to obtain the desired aperture ratio, and it is possible to suppress variations in the amount of ultraviolet light transmitted within the surface of the window 7. The planar shape of the multiple openings 7a can be, for example, equilateral triangles of the same size, squares of the same size, or regular hexagons of the same size. The planar shape of the openings 7a illustrated in Figure 1 is a regular hexagon of the same size.

The shield 8 suppresses the electromagnetic waves generated inside the housing 2 from being radiated to the outside of the housing 2. The shielding effect is related to the reflection loss, absorption loss, and multiple reflection loss in the shield 8, but the shielding effect when shielding electromagnetic waves is dominated by the reflection loss. In order to increase the reflection loss, the reflection coefficient of the shield 8 should be increased. In order to increase the reflection coefficient of the shield 8, the impedance of the shield 8 should be reduced. Therefore, the shield 8 has electrical conductivity. The material of the shield 8 can be, for example, a metal such as aluminum, copper, nickel, stainless steel, or carbon steel. In this case, if the material of the shield 8 is a metal with high electrical conductivity such as aluminum or copper, the reflection loss can be increased, and therefore the transmission of the electromagnetic waves can be effectively suppressed. The material of the shield 8 may be the same as the material of the window 7, or it may be different.

The shield 8 can be, for example, a plate or film containing a conductive material, a conductive paint containing a conductive filler, a conductive plating layer or vapor deposition layer, etc. The plate or film containing a conductive material can be joined to the housing 2 using, for example, an adhesive or double-sided tape. The plate containing a conductive material can also be molded integrally with the housing 2 using, for example, an insert molding method. The conductive paint can be applied to the housing 2, for example. The conductive plating layer can be provided on the surface of the housing 2 by, for example, an electroless plating method. The conductive vapor deposition layer can be provided on the surface of the housing 2 by, for example, a sputtering method.

The shield 8 can be provided, for example, on at least one of the outer wall and the inner wall of the housing 2. In this case, providing the shield 8 on the outer wall of the housing 2 ensures insulation between the shield 8 and the discharge lamp 4, the terminal holder 41, the lighting circuit 6, and the like provided inside the housing 2.

In addition, when the housing 2 is divided into a first part 21 and a second part 22, a shield 8a can be provided on the outer wall of the first part 21, and a shield 8b can be provided on the outer wall of the second part 22. In this case, the shields 8a and 8b are electrically connected at the connection part 2a between the first part 21 and the second part 22.

In addition, if the shield 8 (shield 8b) and the window 7 are electrically connected, the shielding effect of the window 7 can be improved. For example, the shield 8b can be provided around the hole 22a in the inner wall of the second portion 22, and the window 7 and the shield 8b can be brought into contact around the hole 22a.

Here, in addition to the vehicle ultraviolet irradiation device 1, the vehicle is provided with electronic devices used for driving the vehicle. The vehicle ultraviolet irradiation device 1 and the electronic devices are provided in a small space such as the inside of the vehicle, so the distance between the vehicle ultraviolet irradiation device 1 and the electronic devices is likely to be short. Therefore, when electromagnetic waves generated inside the housing 2 are radiated to the outside of the vehicle ultraviolet irradiation device 1, the electromagnetic waves are likely to reach the electronic devices provided near the vehicle ultraviolet irradiation device 1. When the electromagnetic waves reach the electronic devices, they become electromagnetic noise and may cause malfunctions in the electronic devices.

In this case, if a shield 8 and a window 7 having a shielding effect are provided, it is possible to prevent electromagnetic waves generated inside the housing 2 from being radiated to the outside of the vehicle ultraviolet irradiation device 1. Therefore, even if the distance between the vehicle ultraviolet irradiation device 1 and the electronic device is shortened, it is possible to prevent malfunction of the electronic device.

Here, the shield 8 can also be electrically connected to the vehicle ground (e.g., the vehicle body frame). In this case, the window 7 is also electrically connected to the vehicle ground via the shield 8. If the shield 8 and the window 7 are electrically connected to the vehicle ground, the shielding effect can be improved. If the shielding effect is improved, it is possible to suppress malfunctions caused by electromagnetic noise in electronic devices.

However, it has been found that when the shield 8 is electrically connected to the ground of the vehicle, electromagnetic noise is more likely to occur in the electronic device. For example, in an electronic device installed near the vehicle ultraviolet irradiation device 1, the ground of the circuit board installed in the electronic device may be electrically connected to the vehicle ground. In such a case, the shield 8 and the ground of the circuit board installed in the electronic device may be electrically connected via, for example, the vehicle frame. In other words, a noise path loop (ground loop) may be formed. Therefore, depending on the distance and arrangement between the vehicle ultraviolet irradiation device 1 and the electronic device, electrically connecting the shield 8 to the vehicle ground may make it more likely for electromagnetic noise to occur in the electronic device.

In such a case, the shield 8 can be made floating. By making the shield 8 floating, the noise path loop is interrupted, and the electromagnetic noise caused by the noise path loop can be reduced.

For example, as shown in Figures 2 and 3, multiple insulating parts 21b can be provided on the outer wall of the housing 2 on the side opposite to the side from which ultraviolet rays are emitted. For example, the multiple insulating parts 21b protrude from the outer wall of the housing 2 (first part 21).

For example, the insulating parts 21b are columnar and made of insulating resin. For example, the insulating parts 21b can be formed integrally with the housing 2 (first part 21). When the insulating parts 21b are formed integrally with the housing 2, the insulating parts 21b may also protrude from the inner wall of the housing 2 (first part 21).
Also, for example, the insulating parts 21b can be adhered to the housing 2 (first part 21), or the insulating parts 21b can be welded to the housing 2 (first part 21).

For example, the insulating parts 21b may be used as spacers, and when the vehicle ultraviolet irradiation device 1 is attached to a vehicle frame or the like, the insulating parts 21b may be sandwiched between the housing 2 (first part 21) or the shield 8 (shield 8a) and the vehicle frame or the like. However, if the insulating parts 21b are formed integrally with the housing 2 (first part 21) or fixed to the housing 2 (first part 21), the work of attaching the vehicle ultraviolet irradiation device 1 to the vehicle frame or the like is facilitated.

When the insulating parts 21b are columnar, it is preferable to have three or more insulating parts 21b. In this way, the position of the vehicle ultraviolet irradiation device 1 can be stabilized and the mounting strength of the vehicle ultraviolet irradiation device 1 can be increased. The vehicle ultraviolet irradiation device 1 illustrated in FIG. 3 has four columnar insulating parts 21b.

The shape (cross-sectional shape) of the insulating part 21b in a direction perpendicular to the direction in which the insulating part 21b protrudes is not particularly limited. The cross-sectional shape of the insulating part 21b can be, for example, a circle or a rectangle. The height dimension of the insulating part 21b can be greater than the thickness dimension of the shield 8 (shield 8a). In this way, when the vehicle ultraviolet irradiation device 1 is attached to a vehicle frame or the like, it is possible to prevent the shield 8 (shield 8a) from contacting the vehicle frame or the like. The height dimension of the insulating part 21b can be, for example, 1.0 mm or more and 10 mm or less.

The insulating part 21b fixed to the housing 2 (first part 21) can be provided with an insert (embedded female screw) 21b1 exposed on the top surface of the insulating part 21b. If the insert 21b1 is provided in the insulating part 21b, even if the insulating part 21b is made of resin, it is possible to prevent the insulating part 21b from being damaged by fastening with a screw.

At least the top surface of the insulating portion 21b is not provided with the shield 8 (shield 8a). In this way, the shield 8 can be made to float. In this case, it is preferable that the shield 8 (shield 8a) is not provided on the top surface and side surfaces of the insulating portion 21b. In this way, the shield 8 can be made to float more reliably. In this case, as shown in FIG. 3, the shield 8 (shield 8a) can be provided so as to surround the periphery of the insulating portion 21b.

In addition, if the shield 8 is in contact with the wiring 61, the shield 8 may be electrically connected to the ground of a circuit board provided in the electronic device, for example, via the wiring 61 and the vehicle frame. In other words, a noise path loop may be formed.

FIG. 5 is a schematic perspective view illustrating the lead-out of the wiring 61 from the housing 2. As shown in FIG.
As shown in Fig. 5, a hole 2c is provided in the connection portion 2a between the first portion 21 and the second portion 22. As shown in Fig. 2, the hole 2c penetrates between the outer wall and the inner wall of the housing 2 at the connection portion 2a between the first portion 21 and the second portion 22. A wiring 61 electrically connected to the lighting circuit 6 is drawn out to the outside of the housing 2 through the hole 2c.

In this case, the shield 8 (shields 8a, 8b) is not provided at least on the inner wall of the hole 2c. In this way, the shield 8 can be made to float. In this case, as shown in FIG. 3, the shield 8 (shields 8a, 8b) can also be provided so as to surround the periphery of the hole 2c. In this way, the shield 8 can be made to float more reliably.

FIG. 6 is a schematic perspective view illustrating an ultraviolet irradiating device 1a for a vehicle according to another embodiment.
Fig. 7 is a schematic cross-sectional view of the ultraviolet ray irradiation device 1a for vehicles taken along line B-B in Fig. 6. As shown in Fig. 6, the ultraviolet ray irradiation device 1a for vehicles is provided with a bracket 23 (corresponding to an example of a first bracket). That is, the ultraviolet ray irradiation device 1a for vehicles is obtained by further adding the bracket 23 to the ultraviolet ray irradiation device 1 for vehicles described above. For example, a pair of the brackets 23 may be provided.

As shown in FIG. 6, the vicinity of both ends of the bracket 23 is located outside the housing 2. Also, mounting holes 23a are provided at both ends of the bracket 23. Therefore, when mounting the vehicle ultraviolet irradiation device 1a to a vehicle frame or the like, fastening can be performed with screws or the like outside the housing 2. This makes it easy to mount the vehicle ultraviolet irradiation device 1a.

The bracket 23 can be made of a metal such as stainless steel. The bracket 23 can be made by, for example, plastic processing a metal plate. Although the bracket 23 is exemplified as having both ends bent toward the housing 2, the shape of the bracket 23 can be changed as appropriate depending on the installation location of the vehicle ultraviolet irradiation device 1a. For example, the bracket 23 can be flat, or the ends of both ends can be bent away from the housing 2.

As shown in Figures 6 and 7, the bracket 23 can be provided on the top surface of the insulating part 21b. The bracket 23 can be screwed to an insert 21b1 provided on the insulating part 21b, for example. If the bracket 23 is provided on the top surface of the insulating part 21b, contact between the bracket 23 and the shield 8 (shield 8a) can be suppressed, as shown in Figure 7. In other words, the bracket 23 is provided on the top surface of the insulating part 21b and is not electrically connected to the shield 8 (shield 8a). Therefore, even if the material of the bracket 23 is metal, the shield 8 can be made floating, and the formation of a loop in the noise path can be suppressed.

FIG. 8 is a schematic perspective view illustrating an ultraviolet irradiating device 1b for a vehicle according to another embodiment.
Fig. 9 is a schematic cross-sectional view of the ultraviolet ray irradiation device 1b for vehicles in the direction of line CC in Fig. 8. As shown in Fig. 8, the ultraviolet ray irradiation device 1b for vehicles is provided with a bracket 24 (corresponding to an example of a second bracket). That is, the ultraviolet ray irradiation device 1b for vehicles is obtained by further adding the bracket 24 to the ultraviolet ray irradiation device 1 for vehicles described above. For example, a pair of the brackets 24 may be provided.

As shown in FIG. 8, the vicinity of both ends of the bracket 24 is located outside the housing 2. Also, mounting holes 24a are provided at both ends of the bracket 24. Therefore, when mounting the vehicle ultraviolet irradiation device 1b to a vehicle frame or the like, fastening can be performed with screws or the like outside the housing 2. This makes it easy to mount the vehicle ultraviolet irradiation device 1b.

The bracket 24 is conductive. The bracket 24 can be made of, for example, a metal such as stainless steel. The bracket 24 can be made, for example, by plastic processing a metal plate. Note that, although the bracket 24 is exemplified in which the vicinity of both ends of the bracket 24 is bent toward the housing 2 side, the shape of the bracket 24 can be appropriately changed depending on the installation location of the vehicle ultraviolet irradiation device 1b. For example, the bracket 24 may be flat, or the vicinity of both ends may be bent toward the opposite side from the housing 2 side.

8 and 9, the bracket 24 may be provided on the top surface of the insulating portion 21b. The bracket 24 may be screwed to an insert 21b1 provided in the insulating portion 21b, for example.
For example, the ultraviolet ray irradiation device 1b for a vehicle is obtained by replacing the bracket 23 of the ultraviolet ray irradiation device 1a for a vehicle described above with a bracket 24.

Here, depending on the distance and arrangement between the vehicle ultraviolet irradiation device 1b and the electronic device, it may be difficult to form a noise path loop. In such a case, it is preferable to electrically connect the shield 8 to the ground of the vehicle (e.g., the vehicle body frame). Therefore, the bracket 24 is electrically connected to the shield 8. For example, as shown in Figures 8 and 9, the portion of the bracket 24 that faces the shield 8 (shield 8a) may be bent toward the shield 8 (shield 8a). In this case, the portion that faces the shield 8 (shield 8a) and is bent toward the shield 8 (shield 8a) may be in contact with the shield 8 (shield 8a).

As described above, in the ultraviolet irradiation device 1, 1a for a vehicle, the shield 8 provided on the outer wall of the housing 2 can be made floating.
Furthermore, in the case of the ultraviolet ray irradiation device 1b for a vehicle, the shield 8 provided on the outer wall of the housing 2 can be electrically connected to the ground of the vehicle.
In other words, by mounting the vehicle ultraviolet irradiation device 1 directly to the vehicle frame or the like via the insulating part 21b, or by mounting the vehicle ultraviolet irradiation device 1a to the vehicle frame or the like via the insulating part 21b and the bracket 23, the shield 8 provided on the outer wall of the housing 2 can be made floating.
Furthermore, by mounting the vehicle ultraviolet irradiation device 1b on a vehicle frame or the like via the insulating portion 21b and the bracket 24, the shield 8 provided on the outer wall of the housing 2 can be electrically connected to the ground of the vehicle.
Therefore, appropriate noise countermeasures can be implemented depending on the installation location of the vehicle ultraviolet irradiation device, without changing most of the configuration of the vehicle ultraviolet irradiation device.

Although several embodiments of the present invention have been illustrated above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, etc. can be made without departing from the gist of the invention. These embodiments and their variations are included within the scope and gist of the invention, as well as within the scope of the invention and its equivalents described in the claims. Furthermore, the above-mentioned embodiments can be implemented in combination with each other.

The following are additional notes regarding the above-mentioned embodiment.

(Appendix 1)
A discharge lamp capable of emitting ultraviolet light;
a housing having insulating properties and housing the discharge lamp;
A shield having electrical conductivity and provided on an outer wall of the housing;
A plurality of insulating portions provided on an outer wall of the housing;
Equipped with
The shield is not provided on the top surfaces of the insulating portions.

(Appendix 2)
2. The ultraviolet irradiation device for a vehicle according to claim 1, wherein the insulating parts are columnar and integrally formed with the housing.

(Appendix 3)
a first bracket provided on a top surface of the plurality of insulating portions and not electrically connected to the shield;
or
a second bracket provided on a top surface of the plurality of insulating portions, the second bracket having electrical conductivity and electrically connected to the shield;
3. The ultraviolet irradiation device for a vehicle according to claim 1 or 2, further comprising:

(Appendix 4)
A lighting circuit housed in the housing;
a wiring electrically connected to the lighting circuit and drawn out to the outside of the housing through a hole provided in the housing;
Further comprising:
4. The ultraviolet irradiation device for a vehicle according to claim 1, wherein the shield is not provided on an inner wall of the hole provided in the housing.

(Appendix 5)
The lamp further includes a substrate that is housed in the housing and on which the discharge lamp and the lighting circuit are provided,
a ground pattern is provided on a surface of the substrate opposite to a surface on which the discharge lamp and the lighting circuit are provided;
A plurality of protrusions are provided on an inner wall of the housing,
The shield is provided on at least one top surface of the plurality of protrusions,
5. The ultraviolet irradiation device for a vehicle according to claim 1, wherein the ground pattern is electrically connected to the shield provided on the top surface.

1 UV irradiation device for vehicles, 1a UV irradiation device for vehicles, 1b UV irradiation device for vehicles, 2 Housing, 2c Hole, 3 Board, 4 Discharge lamp, 6 Lighting circuit, 8 Shield, 8a Shield, 8b Shield, 21 First part, 21a Convex part, 21b Insulating part, 22 Second part, 23 Bracket, 24 Bracket, 61 Wiring

Claims (5)

A discharge lamp capable of emitting ultraviolet light;
a housing having insulating properties and housing the discharge lamp;
A shield having electrical conductivity and provided on an outer wall of the housing;
A plurality of insulating portions provided on an outer wall of the housing;
Equipped with
The shield is not provided on the top surfaces of the insulating portions. The ultraviolet irradiation device for vehicles according to claim 1, wherein the insulating parts are columnar and integrally formed with the housing. a first bracket provided on a top surface of the plurality of insulating portions and not electrically connected to the shield;
or
a second bracket provided on a top surface of the plurality of insulating portions, the second bracket having electrical conductivity and electrically connected to the shield;
3. The ultraviolet irradiation device for a vehicle according to claim 1 or 2, further comprising: A lighting circuit housed in the housing;
a wiring electrically connected to the lighting circuit and drawn out to the outside of the housing through a hole provided in the housing;
Further comprising:
3. The ultraviolet irradiation device for a vehicle according to claim 1, wherein the shield is not provided on an inner wall of the hole provided in the housing. The lamp further includes a substrate that is housed in the housing and on which the discharge lamp and the lighting circuit are provided,
a ground pattern is provided on a surface of the substrate opposite to a surface on which the discharge lamp and the lighting circuit are provided;
A plurality of protrusions are provided on an inner wall of the housing,
The shield is provided on at least one top surface of the plurality of protrusions,
3. The ultraviolet irradiation device for a vehicle according to claim 1, wherein the ground pattern is electrically connected to the shield provided on the top surface.

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