JP2021137133A - Light emitting device - Google Patents

Abstract

To provide a light emitting device which can notify its surroundings of the fact that light in an ultraviolet region is being radiated with a simplified structure.SOLUTION: A light emitting device comprises: a housing; a substrate comprising a light emitting element for radiating light in an ultraviolet region on one face, and having the other face provided on the housing; a cover which is provided on a front face side of the light emitting element and is disposed so that light in the ultraviolet region radiated from the light emitting element passes therethrough; and a blowing unit which operates during lighting of the light emitting element and is disposed so that wind hits at least a part of the housing. Operation of the blowing unit produces either one of operation sound of the blowing unit and sound which is generated by wind hitting the housing.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to a light emitting device.

Conventionally, a light emitting device (for example, a straight tube type lamp or a light bulb type lamp) that is mounted on a ceiling or a wall surface as an installation surface and irradiates downward or sideways is known. As such a light emitting device, there are a light emitting device for illumination that irradiates light in the visible light region, a light emitting device for sterilization that irradiates light in the ultraviolet region, and the like. Among them, when an LED is used as a light source in a light emitting device that irradiates light in an ultraviolet region, the wavelength in the visible light region is small and the lighting state cannot be visually recognized. Therefore, in a light emitting device for sterilization or the like, a means for notifying a human being that the light in the ultraviolet region is lit is required from the viewpoint of safety.

For example, in the technique described in Patent Document 1, a notification sound is output from the speaker while the low-pressure mercury lamp that irradiates ultraviolet rays is lit, and the notification sound is stopped during the period when the low-pressure mercury lamp is turned off. It is a thing. However, when the technique of Patent Document 1 is used, it is necessary to link the light emitting device and the mechanism for outputting the notification sound, so that the device may have a complicated configuration by drawing out a signal line from the light emitting device, for example. be.

Japanese Patent No. 6490318

An object to be solved by the present invention is to provide a light emitting device that notifies the surroundings that light in an ultraviolet region is being irradiated with a simple configuration.

The light emitting device of the embodiment includes a housing, a substrate provided with a light emitting element that irradiates one surface with light in an ultraviolet region and the other side is arranged in the housing, and a light emitting element provided on the front side of the light emitting element. It is provided with a cover arranged so as to transmit light in an ultraviolet region emitted from the light emitting element, and a blower device which operates when the light emitting element is lit and is arranged so that at least a part of the housing is exposed to the wind. Then, when the blower operates, either the operation sound of the blower or the sound generated by the wind hitting the housing is generated.

According to the embodiment, it can be expected to provide a light emitting device that notifies the surroundings that light in the ultraviolet region is being irradiated with a simple configuration.

It is a perspective view which shows the light emitting device of one Embodiment. It is sectional drawing along the longitudinal direction of the light emitting device on one end side of the light emitting device of one embodiment. FIG. 2 is a cross-sectional view of the light emitting device of the embodiment on the B1-B1'plane shown in FIG. 2 when viewed from the C1 direction. It is a table which shows the value of decibel (dB) and frequency (Hz) satisfying 24.3phon. It is sectional drawing along the longitudinal direction of the light emitting device on the one end side of the light emitting device of the first modification. It is sectional drawing along the longitudinal direction of the light emitting device on one end side of the light emitting device of the 2nd modification. FIG. 6 is a cross-sectional view of the light emitting device of the second modified example on the B2-B2'plane shown in FIG. 6 when viewed from the C2 direction.

Hereinafter, one embodiment will be described with reference to the drawings.

FIG. 1 shows a light emitting device 1 of one embodiment. The light emitting device 1 in this embodiment is, for example, a straight tube lamp. Then, the light emitting device 1 in the present embodiment irradiates light in at least an ultraviolet region. In the present embodiment, the ultraviolet region is defined as a range of 10 nm or more and 380 nm or less in the wavelength of light, and the visible region is defined as a range of 380 nm or more and 780 nm or less in the wavelength of light. The light emitted from the light emitting device 1 preferably has a spectral distribution having a peak in the ultraviolet region. Further, the light emitted from the light emitting device 1 in the present embodiment may be light having only wavelengths in the ultraviolet region, or may be irradiated with light including wavelengths in the ultraviolet region and wavelengths in the visible region. ..

In FIG. 1, the light emitting device 1 in the present embodiment includes a cover 10 and a base 20. The cover 10 is formed in a cylindrical shape elongated in the longitudinal direction, and both ends are open. In this embodiment, the cover 10 is formed in a cylindrical shape. As described above, at least the light in the ultraviolet region is emitted from the light emitting device 1, and the light in the ultraviolet region is irradiated to the outside through the cover 10. In general, light in the ultraviolet region has a short wavelength and high energy, so that a member to which light in the ultraviolet region is incident may be deteriorated. Therefore, it is desirable that the cover 10 is formed mainly of an inorganic material such as quartz glass containing silicon dioxide (SiO2), which is not easily deteriorated by ultraviolet rays and has high light transmittance in the ultraviolet region and the visible region.

Then, the base 20 is attached to both ends of the cover 10 so as to cover the opening of the end of the cover 10. The base 20 includes an electrode 21 and an opening 22. The electrode 21 is an electrode for attaching and fixing the light emitting device 1 to the attachment and supplying electric power to the light emitting device 1 from the outside. In the present embodiment, the electrode 21 is composed of two metals, but the electrode 21 may be composed of one or three or more metals. Further, the electrodes 21 may have a structure in which the bases 20 at both ends of the cover 10 are arranged only on the base 20 on one end side and not on the base 20 on the other end side.

Further, the opening 22 of the base 20 is an opening that penetrates the member constituting the base 20 in the thickness direction thereof. Therefore, the inner space of the light emitting device 1 (the space formed by the cylindrical cover 10 and the base 20) and the outer space of the light emitting device 1 are connected to each other via the opening 22.

Next, the internal structure of the light emitting device 1 will be described with reference to FIGS. 2 and 3. FIG. 2 is a side view showing a cross section of the light emitting device 1 along the longitudinal direction, and shows one end side in which the electrode 21 is arranged on the base 20. Further, FIG. 3 is a cross-sectional view of the cross section of the light emitting device 1 in B1-B1'described in FIG. 2 as viewed from the C1 direction. FIG. 2 is a cross-sectional view taken along the longitudinal direction of the light emitting device 1, and FIG. 3 is a cross-sectional view taken along the lateral direction of the light emitting device 1. A light emitting module 30 is arranged inside the light emitting device 1, and the light emitting module 30 is composed of a light emitting element 31, a substrate 32, and a connector 34. Further, inside the light emitting device 1, a housing 40 to which the light emitting module 30 is attached and a blower device 50 are arranged.

As the light emitting element 31, a semiconductor light emitting element such as an LED is used, and the light emitting element 31 includes one or more light emitting elements 31 that irradiate light in an ultraviolet region. Any other element may be provided as long as it is provided with one or more light emitting elements 31 that irradiate light in the ultraviolet region, for example, the light emitting element 31 that irradiates light in the visible light region, or red. It may be used together with a light emitting element 31 or the like that irradiates light in an outer region (the wavelength of light is larger than 780 nm). Further, although FIG. 2 shows the flip-chip type light emitting element 31, the shape of the light-emitting element 31 is not limited to the flip-chip type. The shape of the light emitting element 31 may be a face-up type or an upper and lower electrode type.

The substrate 32 is formed in an elongated flat plate shape along the longitudinal direction of the straight tube type light emitting device 1. A metal wiring pattern 33 is formed on one surface of the substrate 32. Then, the light emitting element 31 is mounted so that the wiring pattern 33 and the light emitting element 31 are electrically connected. In the present embodiment, since the light emitting element 31 is a flip chip type, the light emitting element 31 is mounted so as to bridge the two wiring patterns 33. Since the light emitting element 31 that irradiates the light in the ultraviolet region is mounted on the substrate 32, there are many opportunities for the light in the ultraviolet region to be incident. Therefore, it is desirable that the substrate 32 is a substrate whose main component is an inorganic material such as aluminum nitride (AlN), aluminum oxide (Al2O3), or silicon nitride (Si3N4), which is not easily deteriorated by ultraviolet rays. As the metal of the wiring pattern 33, it is preferable to use a member having a high reflectance in the ultraviolet region.

Further, the connector 34 is mounted on the wiring pattern 33 of the substrate 32. The connector 34 is a connector for supplying electric power to the light emitting module 30 from the outside, and a cable 60 described later is connected to the connector 34. Therefore, it is desirable that the connector 34 is mounted on the longitudinal end side of the substrate 32 so that the cable 60 does not block the light of the light emitting element 31. The connector 34 is also mounted on the substrate 32, and there are many opportunities for light in the ultraviolet region to be incident on the connector 34. Therefore, it is desirable to use a connector whose main component is a material that is not easily deteriorated by ultraviolet rays.

Then, the light emitting module 30 is attached to the housing 40. The housing 40 is formed in an elongated flat plate shape along the longitudinal direction of the straight tube type light emitting device 1. The dimensions of the housing 40 are preferably at least equal to or greater than those of the substrate 32 in both the longitudinal direction of the light emitting device 1 and the lateral direction of the light emitting device 1. Then, the light emitting module 30 is attached to the housing 40 so that the other surface opposite to the one surface on which the wiring pattern 33 of the substrate 32 of the light emitting module 30 is formed faces the housing 40. At this time, the substrate 32 may be attached between the substrate 32 and the housing 40 via an adhesive heat radiating sheet, the substrate 32 may be screwed to the housing 40 and attached, or the housing 40 may be attached. The substrate 32 may be attached by "caulking" the substrate 32. Further, the housing 40 may be mounted so as to be in direct contact with various aspects of the board 32 without any intervention between the board 32 and the housing 40.

Further, the heat radiation fins 41 may be formed on the side of the housing 40 opposite to the substrate 32. The heat radiating fins 41 are formed so as to extend parallel to the longitudinal direction of the light emitting device 1 and extend from the housing 40 in the direction opposite to the substrate 32. Further, the number of heat radiation fins 41 may be only one, or a plurality of heat radiation fins 41 may be formed. When a plurality of heat radiation fins 41 are formed, the heat radiation fins 41 are formed at intervals in the direction along the longitudinal direction of the light emitting device 1 and the direction along the lateral direction of the light emitting device 1. Is desirable. The heat radiation fins 41 may be integrally formed with the housing 40, or the heat radiation fins 41 and the housing 40 may be formed separately and the heat radiation fins 41 may be attached to the housing 40.

A blower 50 is provided inside the light emitting device 1. The blower 50 forms a wind flow path A1 along the longitudinal direction of the light emitting device 1 inside the light emitting device 1 (the space inside the cover 10). The wind flow path A1 is from the outside of the light emitting device 1, the opening 22 of the base 20 on one end side of the light emitting device 1, the inside of the light emitting device 1 (inner space of the cover 10), and the other of the light emitting device 1. It is formed so as to escape to the outside of the light emitting device 1 through the opening 22 of the base 20 on the end side. It is desirable that the housing 40 and the heat radiation fins 41 are arranged on the wind flow path A1 or in the vicinity of the wind flow path A1 and are exposed to the wind. Since the light emitting element 31 that irradiates the light in the ultraviolet region used in the present embodiment does not have high luminous efficiency and generates a large amount of heat, the housing 40 and the heat radiating fins 41 that receive the heat generated from the light emitting element 31 are blown with wind. It is important to dissipate heat to the outside.

Therefore, any number of blower devices 50 may be installed in any place as long as the above-mentioned wind flow path A1 can be formed. In the present embodiment, the blower device 50 is arranged on one end side of the light emitting device 1, but the location of the blower device 50 is the other end side of the light emitting device 1, the light emitting device 1. It may be the middle part (between one end and the other end). The central part of the light emitting device 1 is, for example, a point that is one half of the total length of the light emitting device 1 from one end of the light emitting device 1 or a point that is one third from the one end side. Or it may be a quarter point from one end side. Then, one or more blowers 50 may be arranged in any one of them, or one or a plurality of blowers 50 may be arranged in any two of them. You may. Further, one or a plurality of blower devices 50 may be arranged at three or more of these locations.

Further, the blower device 50 may be attached to the cover 10, the base 20, or the housing 40 as shown in FIG. When the blower 50 is attached to the central portion of the housing 40 in which the radiating fins 41 are formed, it is preferable to attach the blower 50 between the radiating fins 41.

Further, although the details will be described later, in the present embodiment, it is desirable that the operation sound is generated by the operation of the blower device 50. This operating sound may be a sound generated by the blower device 50 itself, or may be a sound generated by the wind produced by the blower device 50. As the sound generated from the blower device 50 itself, for example, when the blower device 50 is a fan, it may be, for example, the sound of the fan rotating or the sound of the blower device power supply (not shown) for operating the fan. The sound generated by the wind generated by the blower 50 includes, for example, the sound generated by the wind passing through the hole-processed portion provided in the heat-dissipating fin 41 and functioning like a whistle, and the uneven processing portion provided in the heat-dissipating fin 41. This is a sound generated by vibration of air when the wind generated by the blower hits a part of the housing 40 or the heat radiating fin 41, such as a wind noise generated when the wind passes through the protrusion processed portion.

The operating sound is propagated by air through the opening 22 of the base 20 that connects the inside and the outside of the light emitting device 1, or is solidly propagated by the cover 10 and the base 20 of the light emitting device 1, thereby causing the light emitting device. It is propagated to the outside of 1 and enters the ears of people around.

Further, the blower device 50 is preferably made of a light member (for example, a resin material), but since the light emitting module 30 of the light emitting device 1 of the present embodiment irradiates light in the ultraviolet region, it is in the ultraviolet region. When the light enters the blower device 50, the blower device 50 may deteriorate or break down. Therefore, it is preferable that the blower 50 is arranged at a position where the direct light from the light emitting module 30 does not hit. For example, as shown in FIG. 2, it is preferable to dispose the blower 50 in the lateral direction of the housing 40 and the heat radiation fins 41 so as not to protrude in the height direction from the substrate 32 of the light emitting module 30.

Further, a wiring 60 is arranged inside the light emitting device 1. The wiring 60 is connected to the electrode 21 of the base 20 and the connector 34 of the light emitting module 30, and supplies electric power to the light emitting module 30 of the light emitting device 1 from an external power source (not shown). Further, as shown in FIG. 2, the wiring 60 may be arranged so that the light emitting module 30 and the blower device 50 are connected in series. In this case, in order to simplify the wiring of the wiring 60, it is desirable that the connector 34 of the light emitting module 30 and the blower device 50 are arranged on the same side in the light emitting device 1.

Next, the operation when the light emitting device 1 is lit will be described.

The light emitting module 30 of the light emitting device 1 of the present embodiment includes a light emitting element 31 that irradiates light in the ultraviolet region, and the light emitting device 1 irradiates light in the ultraviolet region. Therefore, when the light emitting device 1 (light emitting module 30) is lit, if a person approaches the vicinity of the light emitting device 1, there is a risk of damaging the eyes or the skin. However, the light emitted from the light emitting device 1 that irradiates the light in the ultraviolet region is difficult for the human eye to recognize, and it is difficult to visually judge whether or not the light emitting device 1 is lit. Therefore, in the present embodiment, it is a mechanism that can determine whether or not the light emitting device 1 is lit by hearing.

Therefore, in the present embodiment, the light emitting module 30 of the light emitting device 1 and the blower device 50 are configured to operate in conjunction with each other. As described above, the blower 50 of the present embodiment is configured to generate an operating sound during operation so that the operating sound can be heard by people around. That is, when the light emitting module 30 is lit, the blower device 50 operates and an operation sound is generated, and when the light emitting module 30 is off, the blower device 50 does not operate and no operation sound is generated. .. (In other words, when the blower device 50 operates and an operating sound is generated, the light emitting module 30 lights up, and when the blower device 50 does not operate and no operating sound is generated, the light emitting module 30 does not light up.) Therefore, when the light emitting device 1 (light emitting module 30) is lit, an operation sound is generated, and it is possible to make people around the person audibly recognize that the light emitting device 1 (light emitting module 30) is lit. Become.
As a method of realizing the interlocking operation between the light emitting module 30 and the blower device 50, for example, as shown in FIG. 2, the light emitting module 30 and the blower device 50 may be connected in series. However, the present invention is not limited to this example as long as the light emitting module 30 and the blower device 50 can operate in conjunction with each other. For example, a control unit (not shown) is arranged outside the light emitting device 1, the control unit is connected to the electrode 21 of the base 20 and the blower device 50, and the control unit controls the lighting of the light emitting module 30 and blows the device 50. It may be a method of performing operation control.

In addition, the operating sound needs to be a sound that is perceived by the surrounding people as a sound different from the daily life sound. As a threshold value for that, the inventor has found in a demonstration experiment that the sound must be 24.3 phon or more at a distance of 5 cm from the light emitting device 1. That is, if the sound is smaller than 24.3 phon at a distance of 5 cm, it is regarded as a living sound and is not suitable as an operating sound for recognizing the lighting of the light emitting device 1. When a sound of 24.3 phon is observed at a distance of 5 cm from the light emitting device 1, a sound of at least 24.3 phon or more is emitted from the light emitting device 1. This operating sound is measured by, for example, a microphone installed at a position 5 cm away from the central portion in the longitudinal direction of the light emitting device 1.

The decibel (dB) satisfying 24.3 phon differs depending on the frequency (Hz), and the relationship between dB and Hz satisfying 24.3 phon is expressed as an equal loudness curve. Then, in a two-dimensional space in which the variables are dB and Hz, the equal loudness curve of 24.3 phon becomes a curve that passes through the values shown in FIG. For example, if the dB to be satisfied by the operating sound is defined in the frequency band based on the value of FIG. 4, it is "25 dB or more in the frequency band of 2500 Hz to 5000 Hz" and "35 dB or more in the frequency band of 5000 Hz to 8000 Hz".

With such a configuration of the light emitting device 1, an operating sound is generated when the light emitting device 1 is lit, so that the light emitting device 1 (light emitting module 30) is lit by people around. It is possible to make people recognize that they are there.

Further, since the light emitting module 30 and the blower device 50 operate in conjunction with each other, the blower device 50 is always in operation when the light emitting module 30 is lit. As described above, the light emitting element 31 for irradiating light in the ultraviolet region mounted on the light emitting module 30 of the light emitting device 1 has a lower luminous efficiency than the light emitting element for irradiating visible light generally used in lighting applications. .. Since the amount of heat generated from the light emitting element 31 is large by that amount, if the light emitting element 31 is lit in an environment where the blower device 50 does not operate and appropriate heat dissipation cannot be performed, there is a risk of failure due to heat. When the light emitting module 30 and the blower device 50 operate in conjunction with each other as in the present embodiment, the light emitting device 1 breaks down by lighting the light emitting module 30 in an environment where the blower device 50 is not operating. You can prevent that.

Further, by configuring the light emitting module 30 and the blower device 50 to operate in conjunction with each other, even if the blower device 50 unintentionally fails, the light emitting module 30 does not light up, so that the failures are chained. You can prevent the situation.

Next, a first modification is shown in FIG. In the first modification, the blower device 50 has a size capable of forming a wind flow path A1 in the entire inner region of the light emitting device 1. Specifically, the dimension of the blower 50 is equal to or larger than the inner dimension of the cover 10. Also in the first modification, if the dimensions of the blower 50 are the same as the inner dimensions of the cover 10, the blower 50 can be installed in the same place and quantity as in the above-described embodiment. However, in the first modification, when the dimension of the blower 50 is larger than the inner dimension of the cover 10, the blower 50 is attached to the base 20. At this time, the blower device 50 is in a form that can be arranged only at both ends of the light emitting device 1. In addition, two or more blower devices 50 may be arranged on one end side of the light emitting device 1.

In the first modification, the housing 40 introduced in the previous embodiment, the wind flow path A1 which is a flow path passing through the vicinity of the heat radiation fin 41, and the housing 40 of the light emitting module 30 are arranged. Two wind flow paths are formed: a wind flow path A2, which is a flow path passing through the space between the light emitting module 30 and the cover 10 on the opposite side of the installation. The effect of the wind flow path A1 is the same as that of the previous embodiment. The effect of the wind flow path A2 is that the wind hits the light emitting element 31 and the substrate 33 and can be air-cooled. The light emitting element 31 is a heat generating member, and the substrate 33 is a member that receives heat from the light emitting element 31. Therefore, the air flow path A2 can air-cool the vicinity of the heat generating portion, so that a high cooling effect can be expected.

Further, in the first modification, it is preferable to provide the upper opening 23 in the base 20 in order to efficiently create the wind flow path A2. The upper opening 23 covers the base 20 with the light emitting module 30 on the side opposite to the side on which the opening 22 is arranged and on the side opposite to the side on which the housing 40 of the light emitting module 30 is arranged. It is an opening arranged at a position corresponding to the position of the space between 10 and 10. Since the upper opening 23 is an opening that penetrates the member constituting the base 20 in the thickness direction, like the opening 22, in the first modification, the inner space (cylindrical shape) of the light emitting device 1 is formed. The space formed by the cover 10 and the base 20) and the outside of the light emitting device 1 are connected to each other via the opening 22 and the upper opening 23. The base 20 provided with the electrode 21 has a structure in which the electrode 21 is arranged between the opening 22 and the upper opening 23.

Further, in the first modification, since the dimension of the blower device 50 is equal to or larger than the inner dimension of the cover 10, the wiring 60 is routed between the blower device 50 and the cover 10. There is a possibility that there is no gap. In that case, the wiring 60 may be routed through the shaft portion of the blower device 50. For example, when the fan 50 has a shape in which the fan rotates, the shaft portion of the fan does not move, so that the wiring 60 can be arranged so as to pass through this portion.

In the first modification, since the structure is such that the direct light from the light emitting module 30 is incident on the blower device 50, the blower device 50 is made of a material (for example, metal) that is strong against light in the ultraviolet region. Is preferable.

A second modification is shown in FIGS. 6 and 7. In the second modification, the cover 10 of the light emitting device 1 has a semi-cylindrical shape. Then, the internal space of the light emitting device 1 is formed by the semi-cylindrical cover 10 and the housing 40. In the second modification, since the heat radiating fins 41 are exposed to the outside, there is nothing that blocks heat radiating from the heat radiating fins 41, and high heat radiating capacity can be expected. Further, in the second modification, since the blower device 50 is also exposed to the outside, it is easy for the surrounding people to recognize the operation sound generated by the operation of the blower device 50.

Although some embodiments of the present invention have been described 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 embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Light emitting device 10 Cover 20 Base 30 Light emitting module 31 Light emitting element 40 Housing 41 Heat dissipation fin 50 Blower

Claims (3)

With the housing;
With a substrate having a light emitting element that irradiates light in the ultraviolet region on one surface and the other surface is arranged in the housing;
A cover provided on the front side of the light emitting element and arranged so as to transmit light in the ultraviolet region emitted from the light emitting element;
With a blower that operates when the light emitting element is lit and is arranged so that at least a part of the housing is exposed to wind;
The light emitting device is characterized in that, when the blower is operated, either the operation sound of the blower or the sound generated by the wind hitting the housing is generated. The first aspect of the present invention, wherein the housing is provided with heat radiation fins on a side opposite to the side facing the substrate, and when the blower operates, the wind hits the heat radiation fins to generate sound. Light emitting device. The light emitting device according to claim 1 or 2, wherein the operating sound or the sound generated by the wind hitting the housing is a sound of 24.3 phon or more.

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