阅读说明：本技术 车辆用灯具的外部透镜、具备该外部透镜的车辆用灯具以及该车辆用灯具的制造方法 (Exterior lens for vehicle lamp, vehicle lamp provided with same, and method for manufacturing same ) 是由 长田真太郎 浅香贤一 于 2019-02-08 设计创作，主要内容包括：车辆用灯具的外部透镜具备：第一区域(21),其能够使在可见光区域具有发光波长的来自半导体型的第一光源的光透过；以及第二区域(22),其与第一区域(21)相邻,且包含与壳体接触的接触区域(31)以外并由第二材料形成,第二材料具备：第一透过率以下的第一波长区域；设于比第一波长区域靠长波长侧且第二透过率以上的第二波长区域；以及第一、第二波长区域之间的第三波长区域,第一波长区域是包含从可见光区域内的S波长至短波长侧的可见光的波长区域,第二波长区域是包含从比S波长靠长波长侧的可见光区域内的M波长至长波长侧的L波长为止的波长区域,第一透过率为低透过率,第二透过率为高透过率,第三波长区域的透过率从S波长朝向M波长变高,第一波长区域包含发光波长。(An external lens for a vehicle lamp is provided with: a first region (21) which can transmit light from a first semiconductor-type light source having an emission wavelength in the visible light region; and a second region (22) which is adjacent to the first region (21), includes a contact region (31) which is in contact with the housing, and is formed of a second material, wherein the second material comprises: a first wavelength region having a first transmittance or lower; a second wavelength region provided on the longer wavelength side of the first wavelength region and having a second transmittance or higher; and a third wavelength region between the first and second wavelength regions, the first wavelength region including a wavelength region from an S wavelength in the visible light region to a short wavelength side of the visible light, the second wavelength region including a wavelength region from an M wavelength in the visible light region on a longer wavelength side than the S wavelength to an L wavelength on a longer wavelength side, the first transmittance being low, the second transmittance being high, the third wavelength region having a transmittance increasing from the S wavelength toward the M wavelength, the first wavelength region including an emission wavelength.)

1. An outer lens for a vehicle lamp, characterized in that,

the external lens includes:

a first region formed of a first material; and

a second region which is adjacent to the first region, includes a region other than a region in contact with the case, and is formed of a colored second material,

the first material is a material that transmits light from a first semiconductor-type light source having an emission wavelength in the visible light region,

the second material includes:

a first wavelength region in which the transmittance of light is equal to or lower than a first transmittance;

a second wavelength region provided on the longer wavelength side than the first wavelength region and having a light transmittance of at least a second transmittance; and

a third wavelength region between the first wavelength region and the second wavelength region,

the first wavelength region is a wavelength region including at least visible light from an S wavelength set in a visible light region to a short wavelength side,

the second wavelength region includes at least a wavelength region from an M wavelength set in a visible light region on a longer wavelength side than the S wavelength to an L wavelength on a longer wavelength side than the M wavelength,

the first transmittance is set to a low transmittance that suppresses transmission of light in the first wavelength region,

the second transmittance is set to a high transmittance for transmitting light in the second wavelength region,

the third wavelength region is set such that the transmittance increases from the S wavelength toward the M wavelength,

the transmittance is adjusted by the colorant contained in the second material,

the first wavelength region includes the emission wavelength.

2. An outer lens according to claim 1,

the first transmittance and the second transmittance are transmittances measured when the second material is a plate material having a thickness of 1mm,

the first transmittance is 5% or less, and the second transmittance is 70% or more.

3. An outer lens according to claim 1,

the second wavelength region is set to a range including at least one of wavelengths of 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm, and 1090 nm.

4. An outer lens according to claim 1,

the S wavelength is a wavelength of 680nm or more and less than 780nm,

the emission wavelength is in a wavelength range of 550nm or more and less than 680 nm.

5. An outer lens according to claim 1,

the outer lens does not have a rib structure capable of blocking light from the first light source in the second region.

6. An outer lens according to claim 1,

the base material of the first material and the second material is a thermoplastic resin,

the second material is a material in which the base material contains a dye as a colorant.

7. A lamp for a vehicle, characterized in that,

the vehicle lamp includes:

a lamp body having a housing that is open in a light irradiation direction and that houses a first semiconductor-type light source having an emission wavelength in a visible light region; and

an outer lens covering the opening of the housing,

the external lens includes:

a first region formed of a first material that can transmit light from a first semiconductor-type light source having an emission wavelength in a visible light region; and

a second region which is adjacent to the first region, includes a region other than a region in contact with the case, and is formed of a colored second material,

the second material includes:

a first wavelength region in which the transmittance of light is equal to or lower than a first transmittance;

a second wavelength region provided on the longer wavelength side than the first wavelength region and having a light transmittance of at least a second transmittance; and

a third wavelength region between the first wavelength region and the second wavelength region,

the first wavelength region is a wavelength region including at least visible light from an S wavelength set in a visible light region to a short wavelength side,

the second wavelength region includes at least a wavelength region from an M wavelength set in a visible light region on a longer wavelength side than the S wavelength to an L wavelength on a longer wavelength side than the M wavelength,

the first transmittance is set to a low transmittance that suppresses transmission of light in the first wavelength region,

the second transmittance is set to a high transmittance for transmitting light in the second wavelength region,

the third wavelength region is set such that the transmittance increases from the S wavelength toward the M wavelength,

the transmittance is adjusted by the colorant contained in the second material,

the first wavelength region includes the emission wavelength.

8. The vehicular lamp according to claim 7,

the outer lens does not have a rib structure capable of blocking light from the first light source from entering the second region, and the lamp body does not have a rib structure capable of blocking light from the first light source from entering the second region.

9. The vehicular lamp according to claim 7,

the first transmittance and the second transmittance are transmittances measured when the second material is a plate material having a thickness of 1mm,

the first transmittance is 5% or less, and the second transmittance is 70% or more,

the second wavelength region is set to a range including at least one wavelength of 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm and 1090nm,

the S wavelength is a wavelength of 680nm or more and less than 780nm,

the emission wavelength is in a wavelength range of 550nm or more and less than 680 nm.

10. The vehicular lamp according to claim 7,

the base material of the first material and the second material is a thermoplastic resin,

the second material is a material in which the base material contains a dye as a colorant.

11. A method of manufacturing a lamp for a vehicle, characterized in that,

the method comprises the following steps:

preparing a lamp main body having a housing that is open in a light irradiation direction and that houses a semiconductor-type first light source having an emission wavelength in a visible light region;

preparing an external lens for covering the opening of the housing; and

a step of laser welding a contact region between the outer lens and the housing,

the outer lens is the outer lens of claim 1,

in the step of performing the laser welding, a laser having a wavelength in the second wavelength region is used.

Technical Field

The present disclosure relates to an exterior lens for a vehicle lamp, a vehicle lamp including the exterior lens, and a method of manufacturing the vehicle lamp.

Background

Conventionally, in laser welding a contact portion between a front cover and a lamp body of a vehicle lamp, in order to prevent bubbles formed on a surface of the laser welded portion from being seen through white turbidity, it is known to provide a visible light blocking layer that transmits laser light and absorbs visible light in a welded portion between the entire cover and the lamp body (see patent document 1).

Disclosure of Invention

Problems to be solved by the invention

However, the cover (hereinafter also referred to as an outer lens) is a member that covers and seals an opening on the front side of a lamp main body (hereinafter also referred to as a housing) in which the light source is disposed, and is basically formed using a material that transmits visible light so that light from the light source can be irradiated to the front side.

Further, the outer lens is colored in a color such as red or orange depending on the type of the lamp such as a stop lamp or a turn signal lamp, but since it is necessary to transmit visible light from these lamps, the colored portion is at least translucent, and it is difficult to make the surface slightly scratched to be conspicuous.

On the other hand, in order to embody design of the external lens, when a region other than the region emitting light as a lamp (hereinafter also referred to as a decorative region or the like) is provided, it is necessary to clearly distinguish the region from the lamp region emitting light as a lamp (hereinafter also referred to as a light-emitting region).

Further, the decorative region or the like may be formed of a material that does not transmit visible light, and light from the light-emitting region is not irradiated through the decorative region or the like, so that the light can be clearly distinguished from the light-emitting region.

However, in this case, if there is a scratch on the surface, there is a problem that the scratch is easily noticeable by reflected light from the scratch.

Accordingly, an object of the present disclosure is to provide an external lens for a vehicle lamp, which is less likely to be conspicuous even if a scratch is made in a decorative region or the like, a vehicle lamp including the external lens, and a method for manufacturing the vehicle lamp.

Means for solving the problems

According to one aspect of the present disclosure, an exterior lens of a vehicle lamp includes: a first region formed of a first material; and a second region which is adjacent to the first region, includes a region other than a region in contact with the case, and is formed of a colored second material, wherein the first material is a material capable of transmitting light from a semiconductor-type first light source having an emission wavelength in a visible light region, and the second material includes: a first wavelength region in which the transmittance of light is equal to or lower than a first transmittance; a second wavelength region provided on the longer wavelength side than the first wavelength region and having a light transmittance of at least a second transmittance; and a third wavelength region between the first wavelength region and the second wavelength region, the first wavelength region is a wavelength region including at least visible light from an S wavelength set in a visible light region to a short wavelength side, the second wavelength region includes at least a wavelength region from an M wavelength set in a visible light region on a longer wavelength side than the S wavelength to an L wavelength on a longer wavelength side than the M wavelength, the first transmittance is set to a low transmittance that suppresses transmission of light in the first wavelength region, the second transmittance is set to a high transmittance for transmitting light in the second wavelength region, the third wavelength region is set to a transmittance which increases from the S wavelength toward the M wavelength, the transmittance is adjusted by a colorant contained in the second material, and the first wavelength region includes the emission wavelength.

In this aspect, the first transmittance and the second transmittance are transmittances measured when the second material is a plate material having a thickness of 1mm, and the first transmittance is preferably 5% or less and the second transmittance is preferably 70% or more.

In this embodiment, the second wavelength region is preferably set to a range including at least one of wavelengths of 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm, and 1090 nm.

In this embodiment, the S wavelength is preferably a wavelength of 680nm or more and less than 780nm, and the emission wavelength is preferably in a wavelength range of 550nm or more and less than 680 nm.

In this aspect, it is preferable that the outer lens does not have a rib structure capable of blocking light from the first light source in the second region.

In this aspect, the base material of the first material and the second material is preferably a thermoplastic resin, and the second material is preferably a material in which the base material contains a dye as a colorant.

According to another aspect, a method of manufacturing a vehicle lamp includes: preparing a lamp main body having a housing that is open in a light irradiation direction and that houses a semiconductor-type first light source having an emission wavelength in a visible light region; preparing an external lens for covering the opening of the housing; and a step of laser-welding a region where the outer lens and the housing are in contact with each other, wherein the outer lens is the outer lens according to the above aspect, and the laser-welding step uses a laser beam having a wavelength in the second wavelength region.

According to another aspect, a vehicle lamp includes: a lamp body having a housing that is open in a light irradiation direction and that houses a first semiconductor-type light source having an emission wavelength in a visible light region; and an external lens that covers the opening of the housing, the external lens including: a first region formed of a first material that can transmit light from a first semiconductor-type light source having an emission wavelength in a visible light region; and a second region adjacent to the first region, including a region other than a region in contact with the case, and formed of a colored second material, the second material including: a first wavelength region in which the transmittance of light is equal to or lower than a first transmittance; a second wavelength region provided on the longer wavelength side than the first wavelength region and having a light transmittance of at least a second transmittance; and a third wavelength region between the first wavelength region and the second wavelength region, the first wavelength region is a wavelength region including at least visible light from an S wavelength set in a visible light region to a short wavelength side, the second wavelength region includes at least a wavelength region from an M wavelength set in a visible light region on a longer wavelength side than the S wavelength to an L wavelength on a longer wavelength side than the M wavelength, the first transmittance is set to a low transmittance that suppresses transmission of light in the first wavelength region, the second transmittance is set to a high transmittance for transmitting light in the second wavelength region, the third wavelength region is set to a transmittance which increases from the S wavelength toward the M wavelength, the transmittance is adjusted by a colorant contained in a second material, and the first wavelength region includes the emission wavelength.

In this aspect, it is preferable that the outer lens does not have a rib structure capable of blocking light from the first light source from entering the second region, and the lamp body does not have a rib structure capable of blocking light from the first light source from entering the second region.

In this aspect, the first transmittance and the second transmittance are transmittances measured when the second material is a sheet material having a thickness of 1mm, the first transmittance is 5% or less, the second transmittance is 70% or more, the second wavelength region is set to a range including at least any one of wavelengths of 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm, and 1090nm, the S wavelength is a wavelength of 680nm or more and less than 780nm, and the emission wavelength is in a wavelength range of 550nm or more and less than 680 nm.

In this aspect, the base material of the first material and the second material is preferably a thermoplastic resin, and the second material is preferably a material in which the base material contains a dye as a colorant.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure, an external lens of a vehicle lamp that is less likely to be conspicuous even if a scratch is made in a decorative region or the like, a vehicle lamp including the external lens, and a method for manufacturing the vehicle lamp can be obtained.

Drawings

Fig. 1 is a perspective view of the vehicular lamp of the present embodiment.

Fig. 2 is a perspective view of the lamp main body of the present embodiment.

Fig. 3 is a view from direction a in fig. 2.

Fig. 4 is a perspective view of the front side of the outer lens of the present embodiment.

Fig. 5 is a perspective view of the rear side of the outer lens of the present embodiment.

FIG. 6 is a graph showing the results of measuring the transmittance using a plate material having a thickness of 1mm as the second material of the present embodiment.

Fig. 7 is a diagram for explaining laser welding of the outer lens and the housing according to the present embodiment.

Detailed Description

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

Note that the same elements are denoted by the same reference numerals or symbols throughout the description of the embodiments.

In the embodiment and the drawings, unless otherwise specified, "front", "rear", "upper", "lower", "left", and "right" respectively indicate directions as viewed from a driver seated in the vehicle.

It is to be noted that "up" and "down" are "up" and "down" in the vertical direction, and "left" and "right" are "left" and "right" in the horizontal direction.

Fig. 1 is a perspective view of a vehicle lamp 1 according to the present embodiment.

Fig. 2 is a perspective view of the lamp body 10 according to the present embodiment, and fig. 3 is a view taken along direction a in fig. 2.

Fig. 4 is a front perspective view of the outer lens 20 of the present embodiment, and fig. 5 is a rear perspective view of the outer lens 20 of the present embodiment.

The vehicle lamp 1 of the present embodiment is a rear combination lamp provided on the left and right sides of the rear side of the vehicle, but is not necessarily limited thereto.

The vehicle lamp 1 shown in fig. 1 includes: the lamp main body 10 shown in fig. 2 and 3; and an outer lens 20 shown in fig. 4 and 5.

(Lamp body 10)

As shown in fig. 2 and 3, the lamp body 10 includes: a housing 11 that is open in the light irradiation direction (in this example, the side (left side or right side) of the vehicle and the rear side of the vehicle); an inner panel 12 mounted on the housing 11; and a cable CA led out from the rear side of the housing 11 and having a connector CN for supplying electric power.

The entire inner panel 12 of the present embodiment is silver painted or vapor-deposited.

As shown in fig. 2, the inner panel 12 has an illumination window 12A for a side marker that illuminates light to the side (left or right) of the vehicle, and an inner lens IL1 is provided on the surface side of a region including the illumination window 12A.

Further, the inner lens IL1 has a lattice-like or corrugated shape on the front or back surface so that the back side is not easily visually recognized.

A light source is housed in the housing 11 so as to emit light from the light emission window 12A of the inner panel 12.

In the figure, the light source for the side marker is hidden from view by the inner panel 12.

As shown in fig. 3, the inner panel 12 has an opening 12B in which the light guide member 14 is disposed, and the light for the tail lamp is emitted from the light guide member 14 disposed in the opening 12.

The housing 11 accommodates a light source so that light enters a light entrance end (not shown) of the light guide member 14.

In the figure, the light source for the tail lamp is also hidden from view by the inner panel 12.

As shown in fig. 3, the inner panel 12 has a light emission window 12C for a parking lamp that emits light toward the rear side of the vehicle, and an inner lens IL2 is provided so as to cover the light emission window 12C.

A light source is housed in the housing 11 so as to emit light from the light emission window 12C of the inner panel 12.

Further, the inner lens IL2 has a surface or a back surface formed with irregularities such as a lattice shape or a wrinkle so that it is not easy to visually recognize the light source for the parking lamp.

In the present embodiment, a red LED light source (emission center wavelength is about 620 nm) which is a semiconductor-type first light source having an emission wavelength of 550nm to 680nm is used as each of the light source for the side marker, the light source for the tail lamp, and the light source for the parking lamp, but an LD light source (laser diode light source) or the like may be used.

The manner of housing the first light source in the case 11 is not particularly limited, and the first light source is not limited to being mounted on the case 11, and the first light source may be mounted on the inner panel 12, and the inner panel 12 on which the first light source is mounted may be mounted on the case 11.

As shown in fig. 3, the inner panel 12 has a recessed portion 12D for a turn signal that emits light toward the rear side of the vehicle, and a light emitting portion of a bulb 13 that emits orange (amber) light is disposed therein.

(outer lens 20)

As shown in fig. 1, the external lens 20 is a member attached to the housing 11 so as to cover an opening of the housing 11 (see fig. 2 and 3) that is open in the light irradiation direction (in this example, the side (left side or right side) of the vehicle and the rear side of the vehicle).

As shown in fig. 4, the outer lens 20 includes: a first region 21 corresponding to a side marker, a tail lamp, and a stop lamp which emit light by the first light source; a second region 22 which is provided adjacent to the first region 21, is not a light-emitting region but a decorative region for design; and a third region 23 which is separated from the second region 22 by the first region 21 and corresponds to a turn signal that is emitted by the bulb 13 (see fig. 3).

The first region 21, the second region 22, and the third region 23 all use an acrylic resin as a base material.

The first region 21 is a red-colored region having transparency enough to transmit light from the first light source, using a first material containing a red dye as a coloring agent in its base material, and the third region 23 is a colorless transparent region using a third material of the base resin itself, without adding a dye to the base material.

On the other hand, in the second region 22, a second material colored in a black color by including a dye of a plurality of colors as a coloring agent in a base material is used, and the outer lens 20 of the present embodiment is integrally molded by multicolor molding using the above materials (the first material, the second material, and the third material).

When a dye is used as the colorant in the colored portion, the outer coating can have higher compatibility with the base material, better color tone, and improved appearance, and the outer coating can have improved weather resistance without substantially deteriorating weather resistance of the outer coating due to coloring, as compared with the case where a pigment is used as the colorant.

In the present embodiment, the base resin is an acrylic resin, but the base resin is not necessarily limited thereto, and if the base resin is a thermoplastic resin that does not hinder welding described later, a material other than an acrylic resin may be used.

However, in consideration of weldability, mechanical strength, weather resistance, and the like, an acrylic resin is preferably used as the base resin.

The second material forming the second region 22 will be described in more detail below.

FIG. 6 is a graph showing the results of measuring the transmittance X using a plate material having a thickness of 1mm as the second material.

The transmittance X obtained using the irradiation light amount X1 of light irradiated on the plate material for measurement and the transmission light amount X2 of light transmitted through the plate material is represented by a transmittance X (transmission light amount X2/irradiation light amount X1) × 100 [% ], the horizontal axis of fig. 6 represents the wavelength [ nm ] of light, and the vertical axis represents the transmittance X [% ] of light with respect to each wavelength.

The transmittance of the second material is adjusted by containing a plurality of dyes that absorb light on the shorter wavelength side than the S wavelength, but hardly absorb light on the longer wavelength side than the S wavelength, which will be described later.

In general, the visible light that can be seen by the human eye means a region having a wavelength of 380nm to 780nm (hereinafter referred to as visible light region), and as can be seen from fig. 6, the first wavelength region Y1 is set to be equal to or less than a first transmittance that is a low transmittance that suppresses transmission of light in the first wavelength region Y1, and the first wavelength region Y1 is a wavelength region that includes visible light from the S wavelength of about 700nm set in the visible light region to the short wavelength side.

Specifically, the first transmittance is preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less, and in the present embodiment is about 0.2%.

Even if the weight and material cost are reduced by reducing the first transmittance and reducing the thickness of the outer lens 20 in this way, the light transmission in the first wavelength region Y1 can be suppressed.

As described above, since the emission wavelength of the first light source is 550nm to 680nm, the first wavelength region Y1 is a region including the emission wavelength of the first light source, and the second region 22 formed of the second material is a region in which the transmission of light from the first light source is suppressed.

Therefore, as shown in fig. 5, even if the external lens 20 has a simple structure that does not have a rib structure capable of blocking light from the first light source from entering the second region 22 at the boundary between the first region 21 and the second region 22, the second region 22 does not emit light by the first light source.

As shown in fig. 2, the lamp body 10 may not have a rib structure that can block light from the first light source from entering the second region 22 (see fig. 4).

In this way, since the second region 22 is formed of the second material, a complicated structure in which a rib structure for blocking light is provided is not provided, and light from the first region 21 (lamp region) is not irradiated through the second region 22 (decorative region or the like), so that it is possible to clearly distinguish the light from the lamp region.

In the case of light having a wide range of wavelengths in the visible light region, such as a lamp bulb, even if the transmittance of light having a wavelength from the S wavelength (about 700nm in this example) to the short wavelength side in the visible light region is reduced, light having a wavelength longer than the S wavelength transmits, and the difference from the first region 21 (lamp region) cannot be clearly seen, and therefore, the first light source is preferably a semiconductor-type light source having an emission wavelength in a specific range in the visible light region (for example, a specific range in the visible light region of 680nm or less).

On the other hand, as can be seen from fig. 6, the second material includes: a second wavelength region Y2 provided on the longer wavelength side of the first wavelength region Y1 and having a light transmittance of at least a second transmittance; and a third wavelength region Y3 between the first wavelength region Y1 and the second wavelength region Y2.

Specifically, the second material has a wavelength region including a wavelength region from an M wavelength of 740nm set in a visible light region on a longer wavelength side than 700nm as an S wavelength to an L wavelength of 1650nm on a longer wavelength side than the M wavelength, and has a second wavelength region Y2 set at a high transmittance with a second transmittance of 70% or more.

The second material has a wavelength region including a wavelength region from an M wavelength of 750nm set in a visible light region on a longer wavelength side than 700nm as an S wavelength to an L wavelength of 1164nm on a longer wavelength side than the M wavelength, and has a second transmittance of 80% or more in a second wavelength region Y2.

The second material has a transmittance of substantially 90% or more in a wavelength range of 780nm to 1100nm, and has a wavelength region including a wavelength region from an M wavelength of 780nm set in a visible light region at a longer wavelength side than 700nm as an S wavelength to an L wavelength of 1100nm set at a longer wavelength side than the M wavelength as a second wavelength region Y2 having a second transmittance of substantially 90% or more.

It is preferable that the second wavelength region Y2 is set to a range including at least any one of wavelengths of 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm, and 1090nm, and the second wavelength region Y2 is set to a material capable of setting the second wavelength region Y2 to a range including at least any one of wavelengths of 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm, and 1090nm in any case where the second transmittance is 70% or more, 80% or more, and substantially 90% or more. The reason will be described later.

On the other hand, as shown in fig. 6, the transmittance of the third wavelength region Y3 increases from 700nm, which is the S wavelength, toward the M wavelength (for example, 740nm for the M wavelength at which the second transmittance is 70%, 750nm for the M wavelength at which the second transmittance is 80%, and 780nm for the M wavelength at which the second transmittance is substantially 90% or more).

Since the third wavelength region Y3 is in the visible light region on the long wavelength side, part of the visible light on the long wavelength side can be transmitted.

Therefore, in the second region 22 formed of the second material, not all visible light is reflected by the surface, but a part of visible light enters the inside, and the entered visible light is reflected to the surface side by scattering or the like in the inside.

Accordingly, even if there is a scratch on the surface, the reflected light from the scratch is visually recognized in a state of being mixed with the reflected light from the inside of the second region 22, and therefore the reflected light on the scratched surface is less noticeable, and the scratch itself is less noticeable.

Further, since visible light in the visible light region on the long wavelength side enters the inside, the second region 22 reduces reflection on the surface, suppresses the white color feeling on the surface, and can provide a deep black color and a design property having a heavy feeling.

In addition, as in the present embodiment, when the emission wavelength of the first light source is 550nm to 680nm, the second region 22 does not transmit light from the first light source, and therefore the S wavelength described above is preferably 680nm or more.

On the other hand, as described above, in order to transmit a part of light on the longer wavelength side of the visible light region and make scratches on the surface of the second region 22 less noticeable, the S wavelength is preferably less than 780nm, and the third wavelength region Y3 which is a wavelength region between the S wavelength and the M wavelength is preferably a wavelength region including a wavelength range in the visible light region of 40nm or more.

The third wavelength region Y3 is more preferably a wavelength region including a wavelength range in the visible light region of 60nm or more, and still more preferably a wavelength region including a wavelength range in the visible light region of 80nm or more.

In addition, in the case of black coloring, carbon black is generally used in many cases, but in this case, since carbon black does not transmit light at wavelengths such as 808nm, 840nm, 940nm, 980nm, 1064nm, 1070nm, or 1090nm used in a laser welder, even if the region where the second region 22 and the case 11 are in contact is laser-welded, the surface of the second region 22 is melted first and therefore cannot be welded, and thus another welding method is used.

More specifically, referring to fig. 7, which is a diagram for explaining laser welding of the external lens 20 and the housing 11, when the laser beam LB for fusion is irradiated from the external lens 20 side in a state where the contact region 31 of the external lens 20 shown in fig. 5 is brought into contact with the contact region 32 of the housing 11 shown in fig. 2 and 3, the laser beam LB does not reach the contact surface 30 and the surface of the external lens 20 is fused when colored with carbon black as shown in fig. 7 (a).

On the other hand, in the present embodiment, since the second region 22 including the region in contact with the case 11 and the region other than the region and formed of the second material is transparent to the wavelength used in the above-described laser welder, the laser beam LB can be irradiated to the contact surface 30 with the case 11 without being substantially absorbed by the second material as shown in fig. 7(B), and therefore the surface of the case 11 can be heated and satisfactorily welded.

Further, since the laser beam LB used in the laser welder for the first region 21 and the third region 23 has substantially the same transmittance as that of the second region 22, the portions of the first region 21, the second region 22, and the third region 23 that are in contact with the case 11 can be welded without changing the conditions of the laser intensity during the laser welding.

While the specific embodiments have been described above, the present invention is not limited to the embodiments.

For example, although the case where the emission wavelength of the first light source is 550nm to 680nm has been described in the above embodiment, the light source may have an emission wavelength on a shorter wavelength side.

In this case, the S wavelength may be set to a wavelength in the visible light region on the longer wavelength side than the emission wavelength.

As described above, the present invention is not limited to the specific embodiments, and modifications and improvements without departing from the technical spirit are included in the technical scope of the present invention, which is apparent to those skilled in the art from the description of the claims.

Description of the symbols

1-a vehicle lamp, 10-a lamp body, 11-a housing, 12-an inner panel, 12A-an illumination window, 12B-an illumination section, 12C-an illumination window, 12D-a recess, 13-a bulb, 14-a light guide member, 20-an external lens, 21-a first region, 22-a second region, 23-a third region, 30-a contact surface, 31-a contact region, 32-a contact region, CA-a cable, CN-a connector, LB-a laser, IL1, IL 2-an inner lens.