WO2016051895A1 - Wavelength conversion member, light-emission device, lighting device, and front lamp for vehicle - Google Patents

Abstract

　Provided is a wavelength conversion member for efficiently forming a light distribution pattern that precisely matches a desired shape. A light emission film (1) is a wavelength conversion member including a phosphorescent substance, said film (1) having a wide surface as a top face, and having, as an ideal face, the ideal face of a side face (s), which is derived from an array of phosphor particles (P) forming the surface of the side face (s) in relation to the top face. The distance between the ideal surface and the phosphor particles (P) does not exceed the allowable value (d).

Description

Wavelength conversion member, light emitting device, lighting device, and vehicle headlamp

The present invention relates to a wavelength conversion member containing a fluorescent material.

Among lighting devices that project light emitted from a light source, when a light distribution pattern is defined by a law like a vehicle headlamp, it is necessary to accurately control the light distribution pattern.

Therefore, in the vehicle headlamp described in Patent Document 1, the light is controlled to have a desired shape by covering a part of the light emitted from the light source with a light shielding plate.

Japanese Patent Publication “Japanese Unexamined Patent Application Publication No. 2004-87435 (published on March 18, 2004)”

When using a light-shielding plate, the utilization efficiency of the light emitted from the light emitting unit is reduced. On the other hand, when the light shielding plate is not used, the shape of the peripheral portion of the light emitting unit greatly affects the light distribution pattern of the light emitting device. In particular, when the light emitting portion includes a fluorescent material that emits fluorescence upon receiving excitation light, the light distribution pattern is strongly influenced by the particle arrangement of the fluorescent material at the peripheral portion of the light emitting portion. Therefore, in order to obtain a desired light distribution pattern, it is necessary to strictly control the particle arrangement of the fluorescent substance at the peripheral portion of the light emitting portion.

The inventors of the present invention have found such a problem for the first time.

An object of the present invention is to provide a wavelength conversion member for efficiently forming a light distribution pattern that accurately matches a desired shape.

In order to solve the above problems, a wavelength conversion member according to one embodiment of the present invention is a wavelength conversion member including a fluorescent material, and a surface of a side surface with respect to the upper surface is a wide surface of the wavelength conversion member. An ideal surface of the side surface, which is derived from an array of a plurality of particles of the fluorescent material forming the surface, is an ideal surface, and the distance between the ideal surface and each of the particles is less than an allowable value.

According to one aspect of the present invention, a desired light distribution pattern reflecting the high shape controllability of the wavelength conversion member can be realized.

It is sectional drawing which shows the structure of the illuminating device of Embodiment 1. FIG. It is sectional drawing which shows the structure of the light-emitting device with which the illuminating device shown by FIG. 1 is provided. It is a top view which shows the structure of the conventional light emitting film with respect to the light emitting film with which the light-emitting device shown by FIG. 2 is provided. It is a top view which shows the structure of the light emitting film with which the light-emitting device shown by FIG. 2 is provided. It is a top view which shows the detailed structure of the light emitting film shown by FIG. It is a top view which shows the example of the film | membrane shape of the light emitting film shown by FIG. It is sectional drawing which shows the manufacturing method of the light emitting film in the light-emitting device shown by FIG. FIG. 6 is a top view and a cross-sectional view illustrating a method for manufacturing a light emitting film in a light emitting device according to Embodiment 2. It is sectional drawing which shows the manufacturing method of the light emitting film in the light-emitting device of Embodiment 3. 6 is a cross-sectional view illustrating a method for producing a light emitting film in a light emitting device according to Embodiment 4. FIG. FIG. 10 is a cross-sectional view illustrating a method for producing a light emitting film in a light emitting device according to Embodiment 5. It is the top view and sectional drawing which show the manufacturing method of the light emitting film in the light-emitting device of Embodiment 6. It is a schematic diagram which shows the structure of the illuminating device of Embodiment 7. FIG. 10 is a schematic diagram illustrating a configuration of a lighting device according to an eighth embodiment.

[Embodiment 1]
A first embodiment of the present invention will be described with reference to FIGS.

≪Configuration of lighting devices 3a and 3b≫
FIG. 1 is a cross-sectional view illustrating the configuration of the illumination devices 3a and 3b of the present embodiment, where (a) illustrates the illumination device 3a and (b) illustrates the illumination device 3b.

As shown in FIG. 1A, the illumination device 3a includes a light emitting device 5 and a light projecting lens 51a (optical element). The light projecting lens 51a projects and refracts the illumination light L emitted from the light emitting device 5 and projects it.

As shown in FIG. 1B, the illumination device 3b includes a light emitting device 5 and a light projecting reflector 51b (optical element). The light projecting reflector 51 b reflects and projects the illumination light L emitted from the light emitting device 5.

Note that the lighting devices 3a and 3b are not limited to the above-described configuration, and may include an optical system in which a light projecting lens 51a and a light projecting reflector 51b are combined.

<< Configuration of Light Emitting Device 5 >>
FIG. 2 is a cross-sectional view showing the configuration of the light emitting device 5 provided in the illumination devices 3a and 3b shown in FIGS.

The X axis and the Y axis are axes that extend in a horizontal direction on the wide surface of the substrate 2 (hereinafter referred to as “substrate surface”). The Z axis is an axis extending in a direction perpendicular to the substrate surface. This coordinate axis corresponds to the coordinate axis shown in the figures other than FIG.

As shown in FIG. 2, the light-emitting device 5 includes a light-emitting film 1 (wavelength conversion member) and a substrate 2.

(Light-emitting film 1)
The light emitting film 1 is disposed on the substrate 2 and includes particles of a phosphor (fluorescent substance) that emits fluorescence F upon receiving laser light E (excitation light) emitted from the laser light source 3.

When the light emitting film 1 is irradiated with the laser light E, the fluorescence F is extracted from the surface (upper surface) of the light emitting film 1 opposite to the surface facing the substrate 2. This upper surface is one of the wide surfaces of the light emitting film 1.

(Substrate 2)
The material of the substrate 2 is a metal such as aluminum or copper, or a ceramic such as SiC or AlN. When the light emitting film 1 emits the fluorescence F, the light emitting film 1 emits heat. When the temperature of the light emitting film 1 increases, the luminous efficiency of the phosphor contained in the light emitting film decreases. However, if the material of the substrate 2 is a metal or a ceramic having good thermal conductivity, a large amount of heat emitted from the light-emitting film 1 can be dissipated, so that a decrease in the luminous efficiency can be suppressed.

(Laser beam E)
The laser light E is incident on the surface of the light emitting film 1 opposite to the surface facing the substrate 2. The fluorescence F is extracted from the side of the light emitting film 1 where the laser beam E is incident. That is, the side on which the laser beam E is incident on the light emitting film 1 and the side on which the fluorescence F is extracted from the light emitting film 1 are the same. At this time, the fluorescence F emitted from the light emitting film 1 toward the substrate 2 is reflected by the surface of the substrate 2. The fluorescence F thus reflected can be used for light projection by taking out the laser light E from the side where the laser light E enters the light emitting film 1. For this reason, it is preferable that the reflectance of the surface of the substrate 2 on the light emitting film 1 side is high.

The light spot shape of the laser light E is controlled so that the laser light E is irradiated on the entire light emitting film 1. That is, the size of the light spot of the laser beam E is the same as or larger than the size (area S) of the light emitting film 1. For this reason, the light emitted from the entire light emitting film 1 is used for forming a light distribution pattern (light projection pattern) of the light emitted from the light emitting device 5. The light distribution pattern means an image of light formed by irradiating the irradiation target with the fluorescence emitted from the light emitting device 5. The light distribution pattern is not limited to the projection of the shape of the light emitting region of the light emitting film 1 as it is, and a light distribution pattern that is not similar to the shape of the light emitting region is formed by the light projecting lens 51a or the light projecting reflector 51b. Also good. In this case, the light distribution pattern reflecting the high shape controllability of the light emitting region can be obtained by using light emitted from the peripheral portion of the light emitting region for light projection to the peripheral portion of the light distribution pattern. it can.

The laser light E receives the laser light E of the light emitting film 1 so that no shadow is formed when the fluorescent light F is emitted from the light emitting film 1 (a light source of the laser light E does not block the fluorescent light F). It is preferable to enter from the angle which becomes diagonal with respect to the surface.

(Light source of laser beam E)
The light source of the laser beam E is, for example, a semiconductor laser element that emits a laser beam having a wavelength of 450 nm (blue). When the light source of the excitation light is a semiconductor laser element, the energy density of the excitation light with respect to the irradiation area of the excitation light can be increased as compared with a configuration using other light sources. That is, the brightness of the light that excites the phosphor included in the light emitting film 1 can be increased.

The excitation light source for irradiating the light emitting film 1 with excitation light is not limited to the semiconductor laser element, but may be an LED (light emitting diode).

(Wavelength of laser beam E)
In order for the light emitting device 5 to emit white light, the laser light E is preferably blue or purple.

When the laser beam E is blue, the phosphor included in the light emitting film 1 is a phosphor that emits yellow fluorescence F or green and red fluorescence F, and the laser beam E diffusely reflected on the surface of the light emitting film 1 and the fluorescence By emitting F, the light emitting device 5 can distribute white illumination light in which the laser beam E and the fluorescence F are mixed.

When the laser beam E is purple, the phosphor included in the light emitting film 1 is changed to a phosphor that emits blue, green, and red fluorescence F or blue and yellow fluorescence F. It is possible to distribute white illumination light in which the fluorescent light F is mixed. In this case, it is preferable that the laser light E reflected by the light emitting film 1 or the substrate 2 is not emitted from the light emitting device 5 by the wavelength selection filter.

≪Comparison of luminescent film≫
(Conventional light emitting film)
3 is a top view showing the configuration of a conventional light-emitting film 101 with respect to the light-emitting film 1 included in the light-emitting device 5 shown in FIG. 2, wherein (a) shows the entire light-emitting film 101, and (b) shows An enlarged view of a part A of the peripheral edge of the light emitting film 101 is shown.

As shown in FIG. 3A, conventionally, the shape of the light-emitting film 101 when viewed from the positive side of the Z-axis has not been controlled so as to follow the ideal shape indicated by the broken line. In addition, as shown in FIG. 3B, in part A of the peripheral portion of the light emitting film 101, the phosphor particles P (particles) included in the light emitting film 101 have an ideal shape shown by a broken line. Were not aligned.

If the entire light emitting film 101 is not irradiated with the laser light, a phosphor (hereinafter referred to as “peripheral phosphor”) included in the peripheral portion of the region of the light emitting film 101 irradiated with the laser light (hereinafter referred to as “excitation region”). Is adjacent to a phosphor contained outside the excitation region (hereinafter “excitation region phosphor”). At this time, since the laser light is guided inside the light emitting film, the phosphor outside the excitation region also emits fluorescence. Therefore, the shape of the region of the light emitting film 101 that emits fluorescence (hereinafter referred to as “light emitting region”) is broken.

Further, as shown in part A of the peripheral edge of the light emitting film 101, even when the peripheral fluorescent material is not adjacent to the phosphor outside the excitation region, as shown in FIG. If the arrangement of the body particles (phosphor particles P) is deviated (distorted) from the desired shape, the shape of the light emitting region is destroyed.

As described above, when the shape of the light-emitting region of the light-emitting film 101 is broken, the shape controllability of the light distribution pattern of the light-emitting device determined based on the accuracy of the light-emitting region shape is deteriorated, and unevenness that is unacceptable to the projected light. Arise.

(Light Emitting Film 1 of this Embodiment)
4 is a top view showing the configuration of the light-emitting film 1 included in the light-emitting device 5 shown in FIG. 2, where (a) shows the entire light-emitting film 1 and (b) shows the periphery of the light-emitting film 1. A part A is enlarged.

In FIG. 4, all the phosphor particles P are shown to have a constant particle size, but the particle size is not necessarily constant. The same applies to the drawings other than FIG.

As shown in FIG. 4A, the film shape of the light-emitting film 1 when viewed from the positive side of the Z-axis matches the ideal shape. Further, as shown in FIG. 4B, in part A of the peripheral portion of the light emitting film 1, the phosphor particles P forming the side surface of the light emitting film 1 move the light emitting film 1 from the Z axis positive direction side. When viewed, they are aligned with the ideal shape indicated by the dashed line. In other words, a line representing a desired shape coincides with a boundary line between the light emitting film 1 and the exposed portion of the substrate 2 (a portion where the light emitting film 1 is not provided). And since the fluorescence F radiate | emits from the light emission area | region of an ideal shape, the light distribution pattern of the light-emitting device 5 corresponds with a desired shape.

≪Particle arrangement of phosphor particles P≫
5 is a top view showing a detailed configuration of the light emitting film 1 shown in FIG. 4. FIG. 5 (a) shows the entire light emitting film 1, and FIGS. 5 (b) to (f) show the peripheral portion of the light emitting film 1. FIG. The particle arrangement | sequence of the fluorescent substance particle P contained in a part A is shown.

(Envelope of phosphor particle P)
As shown in FIG. 5A, the light emitting film 1 is arranged in a rectangular parallelepiped shape, for example, on the substrate surface. That is, the upper surface of the light emitting film 1 is rectangular. In order to simplify the description, the following description will be made on the assumption that the phosphor particles P of the light emitting film 1 are only one layer. When there are a plurality of layers of the phosphor particles P constituting the light emitting film 1, the phosphor particles P arranged on the outermost side as viewed from above may be analyzed later.

The laser light E (see FIG. 2) is applied to the entire light emitting film 1. Here, the reference direction D represents a predetermined direction from the inside of the light emitting film 1 to the outside. Below, the arrangement | sequence of the fluorescent substance particle P in the peripheral part (side surface s) of the light emitting film 1 is demonstrated.

As shown in FIG. 5B, the outer edge of a region where each surface of the phosphor particles P forming the side surface of the light emitting film 1 is projected onto the substrate 2 in a part A of the peripheral edge of the light emitting film 1 is shown. Let the width of the envelope ENV be w. The width w is the distance between two parallel tangent lines drawn with respect to the envelope ENV that draws the curve. The width w is a value equal to or smaller than an allowable value d representing an allowable value of distortion (shape collapse) from the ideal arrangement of the phosphor particles P forming the peripheral edge (side surface s) of the light emitting film 1 (that is, w ≦ d). The allowable value d can be arbitrarily set from the relationship between the accuracy required for the light distribution pattern and the magnification when the light emitting area is projected. For example, the average value of the phosphor particles P included in the light emitting film 1 By setting the diameter (average value of diameters), a highly accurate light distribution pattern can be obtained in a high-luminance illumination device using laser light as an excitation light source.

(Arrangement of phosphor particles P with respect to desired linear shape)
As shown in (c) of FIG. 5, in a part A of the peripheral portion of the light emitting film 1, with a straight line l (basic reference line) representing a reference line of an ideal linear array of the phosphor particles P as a center, Consider a region in which the allowable range of the arrangement of the phosphor particles P is expanded in the reference direction D and in the opposite direction so that the width becomes the allowable value d. This allowable value d is, for example, the average particle diameter of the phosphor particles P included in the light emitting film 1.

And when each vertex on the surface of the phosphor particle P forming the side surface of the light emitting film 1 closest to the reference direction D is included in the region, as shown in FIG. 5A, the light emitting film The arrangement of the phosphor particles P forming the side surface of the light emitting film 1 in at least a part of the peripheral edge of 1 can be regarded as a desired linear shape. At this time, the deviation between the actual light distribution pattern of the light-emitting device 5 and the desired orientation pattern is within the range indicated by the allowable value d. That is, the shape controllability of the light distribution pattern is enhanced.

“Shape controllability” means the degree to which the shape of the object of interest can be brought closer to the reference shape. Therefore, “high shape controllability” means that the shape of the object can be brought close to the reference shape with high accuracy.

(Particle arrangement of phosphor particles P with respect to desired curve shape)
As shown in (d) of FIG. 5, in a part A of the peripheral portion of the light emitting film 1, each surface on the reference direction D side among the surfaces of the phosphor particles P forming the side surface of the light emitting film 1, Consider a distance from a curve m (basic reference line) representing a desired curve shape. As described above, the allowable value d of the distance from the basic reference line (ideal position) of the phosphor particles P is, for example, the average particle diameter of the phosphor particles P.

For example, the distance between the surface on the reference direction D side of the surface of the phosphor particle P1 (particle) and the curve m is the length d1. Further, the distance between the surface on the reference direction D side of the surface of the phosphor particle P2 (particle) and the curve m is the length d2.

When the distance between the surface on the reference direction D side of the surface of the phosphor particle P in the part A of the peripheral portion A of the light emitting film 1 and the curve m is less than or equal to half of the allowable value d, FIG. In the top view of (a), at least a part of the peripheral portion of the light emitting film 1 can be regarded as a curve having a desired shape. At this time, the deviation between the light distribution pattern of the light emitting device 5 and the desired curved shape is reduced. That is, the shape controllability of the light distribution pattern is enhanced.

(First example of preferable particle arrangement conditions)
Here, a preferable particle arrangement will be described from a viewpoint different from the viewpoint of the particle arrangement described above. The particle arrangement for improving the shape controllability of the light distribution pattern of the light emitting device 5 is represented by the center c of the phosphor particle P and the line n (straight line and curve) representing the desired shape shown in FIG. Including). In the following, the direction a represents the reference direction D. A direction b represents a direction opposite to the reference direction D.

As an example of the condition for improving the shape controllability of the light distribution pattern, the distance between the following (1) and the following (2) in the part A of the peripheral portion of the light emitting film 1 is an allowable value d or less. The condition that there is. The allowable value d is, for example, the average particle diameter of the phosphor particles P.
(1) Center c of phosphor particle P
(2) A line nb that has moved in the direction b by the radius of each phosphor particle P from the line n indicating the film shape of the desired light-emitting film 1
The viewpoint described here can be expressed as follows. That is, when the ideal surface of the side surface is derived from the arrangement of a plurality of particles of the fluorescent material forming the surface of the side surface with respect to the upper surface which is the wide surface of the light emitting film 1, the ideal surface of the side surface is viewed from the upper surface side. A line n indicating the position and shape is taken as a basic reference line. A line obtained by moving the basic reference line toward the inside of the light emitting film 1 by a distance corresponding to the radius of each of the plurality of particles is defined as an individual reference line of the particle. For each of the plurality of particles, the distance between the particle center c and the individual reference line is within a predetermined allowable value. This predetermined allowable value is, for example, the average particle diameter of the plurality of particles.

Here, the distance between the ideal surface and each of the particles may be a distance between the ideal surface calculated on each of the plurality of particles and a point on the surface of the particle closest to the ideal surface. .

Further, when the side surface of the light emitting film 1 is a plane, the basic reference line can be calculated from the centers and particle sizes of the plurality of phosphor particles P forming the side surface of the light emitting film 1 by the least square method.

When the light emitting film 1 is viewed from the upper surface side, if the side surface of the light emitting film 1 is a circle or an ellipse, the basic reference line is the center of the plurality of phosphor particles P that form the side surface of the light emitting film 1. And a circle or an ellipse (approximate curve (assumed approximate surface)) estimated from the particle diameter.

(Second example of preferable particle arrangement conditions)
By considering the tangent on the direction a side on the surface of the phosphor particle P (for example, the line Ca shown in FIG. 5 (e)) among the line group in which the line n is moved in the direction a or the direction b. The conditions for improving the shape controllability of the light distribution pattern can be derived. This condition (second example) is a condition set from a different viewpoint from the first example described above, and is applied independently of the first example.

Here, the lines shown in (f) of FIG. 5 will be described as follows.
Line n: a straight line or a curve (basic reference line) indicating the desired film shape of the light emitting film 1
Line Ca (outer reference line): Among the line group in which the line n is moved in the direction a or the direction b, the most direction a side (light emitting film) of the tangential group on the direction a side on the surface of the phosphor particle P Tangent / line Cb (inner reference line) located on the outermost side of 1: tangent / line N on the most direction b side in the tangent line group: intermediate line / line Nb: line N between line Ca and line Cb A line moved in the direction b by the radius r of the phosphor particle P. At this time, increasing the shape controllability of the light distribution pattern means that the “phosphor particle” This is equivalent to the fact that the distance between the center c of P and the line Nb is less than or equal to half the allowable value d (hereinafter “condition α”). The condition α can also be expressed as “the distance between the line Ca and the line Cb is equal to or less than the allowable value d”. This allowable value d is, for example, the average particle diameter of the phosphor particles P.

(Other)
As shown in FIG. 5A, since the four sides of the light emitting film 1 are linear, the shape controllability of the light distribution pattern of the light emitting device 5 can be improved on all sides of the light distribution pattern. it can. However, the present invention is not limited to this configuration, and even if the shape controllability of only a part of the light emitting film corresponding to a part of the light distribution pattern (for example, one of the four sides of the light emitting film 1) is increased. Good.

In particular, a part of the low beam distribution pattern of the vehicle headlamp is required to be linear (bright / dark boundary line) according to laws and regulations in Japan. Therefore, the light emitting device 5 including the light emitting film 1 having a straight side is suitable for a vehicle headlamp.

In this case, the laser light may be irradiated to a region including at least a part of the peripheral portion having high shape controllability in the light emitting film 1.

As shown in FIGS. 5B to 5E, if the phosphor particles P are in contact with each other, the shape controllability of the light emitting film 1 can be improved. The light emitting device 5 including the light emitting film 1 is also suitable for a lamp that requires linearity.

Note that the particle arrangement of the phosphor particles P (the shape controllability of the light emitting film 1) can be evaluated by an optical microscope or an electron microscope.

<< Shape of Light-Emitting Film 1 >>
6A to 6F are top views showing examples of the film shape of the light emitting film 1 shown in FIG. As indicated by bold lines in FIGS. 6A to 6F, at least a part of the peripheral portion of the light emitting film 1 is linear so as to satisfy the condition α.

6A, the film shape of the light emitting film 1 is, for example, a rectangle. The laser light E (see FIG. 2) is irradiated on the entire light emitting film 1.

As shown in FIG. 6B, the film shape of the light emitting film 1 is, for example, a shape in which one side of the light emitting film 1 is linear. The laser beam E is applied to a region including the entire light emitting film 1.

As shown in FIG. 6C, the film shape of the light emitting film 1 is, for example, a circle. The laser light E is applied to the entire light emitting film 1.

As shown in FIG. 6D, the film shape of the light emitting film 1 is, for example, a shape provided with a hole. On one side where the hole of the light emitting film 1 is formed, the condition α is satisfied. The above-described “peripheral portion of the light emitting film 1” may include the peripheral portion of the hole. The laser beam E is applied to the periphery B of the one side.

As shown in FIG. 6 (e), in the film shape of the light emitting film 1 shown in FIG. 6 (b), the laser light E is irradiated to the periphery B on one side where the condition α is satisfied.

As shown in FIG. 6F, the film shape of the light emitting film 1 is, for example, a shape in which a part of one side of the light emitting film 1 is linear. The laser beam E is applied to the periphery B of the part.

As described above, the light emitting film 1 can take various shapes.

<< Effect of Light-Emitting Device 5 (Especially Light-Emitting Film 1) >>
The light-emitting device 5 includes the light-emitting film 1 with high shape controllability at the peripheral edge, and the entire surface of the light-emitting film 1 is irradiated with the laser light E, whereby the light distribution pattern of the light-emitting device 5 is changed to a desired shape. You can get closer.

In the light emitting device 5, it is not necessary to provide a light shielding plate for controlling the light distribution pattern, and the light emitted from the light emitting film 1 is not blocked by the light shielding plate, so that the light use efficiency can be kept high.

The energy density of the laser light E is higher than the energy density of the excitation light emitted from a light source other than the laser element. Therefore, the area of the light emitting film 1 that receives the laser light E and emits fluorescence can be made smaller than the area of the light emitting film that receives other types of excitation light and emits the same amount of fluorescence.

When projecting the light emitting area shape to a specific size, the light emitting area of the light emitting film 1 is enlarged and projected at a higher magnification as the light emitting film 1 is made smaller. Therefore, the influence of the film shape of the light emitting film 1 on the light distribution pattern of the light emitting device 5 is increased. In such a case, the light emitting device 5 is particularly useful.

Furthermore, since no phosphor is present outside the light emitting film 1, the contrast ratio between light and dark is high between the peripheral edge of the light emitting region of the light emitting film 1 and the outside thereof. Therefore, the light distribution pattern of the light emitting device 5 has a clear light / dark boundary line.

<< Method for Manufacturing Light-Emitting Film 1 in Light-Emitting Device 5 >>
FIG. 7 is a cross-sectional view showing a method for manufacturing the light emitting film 1 in the light emitting device 5 shown in FIG.

As shown in FIG. 7, the frame material 4 (flow suppressing portion) is brought into close contact (contact) with the substrate 2. The frame member 4 has a shape corresponding to a desired light emitting region shape, and surrounds a region corresponding to the desired light emitting region shape on the surface of the substrate 2. The ink 10 including the above-described phosphor particles P (see FIG. 2) is applied (filled) to a region surrounded by the frame material 4. Then, the frame material 4 is removed, and the applied ink 10 is used as the light emitting film 1 described above.

The shape of the frame material 4 is reflected in the shape of the side surface s of the light emitting film 1. The distortion of one side of the frame material 4 from the ideal shape of one side of the light emitting film 1 is equal to or less than a predetermined allowable value (for example, the average particle diameter of the phosphor particles of the light emitting film 1). Therefore, in FIG. 5B, the distance between the ideal surface of the side surface s of the light emitting film 1 and the phosphor particles P can be set to a predetermined allowable value or less.

The organic component contained in the ink 10 is removed by a baking process so that it does not volatilize or decompose when irradiated with the laser beam E.

(Application of ink 10)
For the application of the ink 10, it is preferable to use a printing technique that can use an ink having a high viscosity. Thereby, the said application | coating shape can be controlled easily. Specifically, in the printing method, since the ink 10 is pushed in by a squeegee, the thickness of the ink 10 can be made uniform. Further, even when the ink 10 includes phosphor particles having a large particle diameter, a light emitting film with high shape controllability can be formed.

Furthermore, it is more preferable to use a printing process using a metal mask for applying the ink 10. In the printing process using a metal mask, no mesh is used. Therefore, no mesh marks remain on the ink 10, so that the thickness of the ink 10 can be made more uniform.

(Gap 41 between the substrate 2 and the frame member 4)
A gap 41 between the substrate 2 and the frame member 4 is processed with resin. Thereby, since resin fills the unevenness | corrugation of the surface of the board | substrate 2 and the frame material 4, the penetration | invasion of the ink 10 to the clearance gap 41 can be prevented.

The gap 41 between the substrate 2 and the frame member 4 is preferably suppressed to at least the particle size of the phosphor particles P. Thereby, it is possible to prevent the phosphor particles P from flowing into the ink 10 and being carried to the gap 41, and to keep the shape controllability of the light emitting film 1 (see FIG. 2) high.

As described above, the light emitting device 5 including the light emitting film 1 and the substrate 2 can be manufactured. The light emitting device 5 and the light emitting film 1 manufactured as described above are also included in the technical scope of the present invention.

<< Effect of the manufacturing method of the present embodiment >>
In the method for manufacturing the light emitting device 5, the shape of the peripheral portion of the light emitting film 1 can be accurately controlled by the frame material 4 having a shape corresponding to a desired light distribution pattern. It is not necessary to process the light emitting film 1 after applying the ink 10 to the substrate 2. Thereby, it can prevent that the shape of the peripheral part of the light emitting film 1 collapses in a manufacturing process.

[Embodiment 2]
A second embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Method for Manufacturing Light-Emitting Film 1 in Light-Emitting Device 5a >>
Here, a manufacturing method of the light emitting film 1 different from the manufacturing method in the first embodiment will be described. Also in the manufacturing method of the present embodiment, the light-emitting film 1 whose shape is controlled similarly to the light-emitting film 1 in the first embodiment can be manufactured.

8A and 8B are diagrams illustrating a method for manufacturing the light emitting film 1 in the light emitting device 5a of the present embodiment, where FIG. 8A is a top view and FIG. 8B is a cross-sectional view.

As shown in FIGS. 8A to 8B, a groove 21 is provided in the substrate 2 to form the substrate 2a. A cutting technique such as dicing is used for the formation. The groove 21 has a shape along a predetermined region of the wide surface (hereinafter referred to as “substrate surface”) of the substrate 2a. Ink 10 containing the above-described phosphor particles P (see FIG. 2) is applied to a region in contact with the groove 21. The ink 10 applied in this way is referred to as the light emitting film 1 described above.

The groove 21 may be provided in the substrate 2 after the ink 10 is applied to the substrate 2 to form the light emitting film 1. However, in order to increase the shape controllability of the light emitting film 1, the groove 21 is preferably provided in the substrate 2 before applying the ink 10 to the substrate 2.

As a method of forming the light emitting film 1 after forming the groove 21 in the substrate 2, for example, an electrophoresis method of the phosphor particles P, a sedimentation method, or a coating method of the ink 10 using a dispenser can be used.

As described above, the light emitting device 5a including the light emitting film 1 and the substrate 2a can be manufactured. The light emitting device 5a and the light emitting film 1 manufactured as described above are also included in the technical scope of the present invention.

<< Effects of this embodiment >>
When a substrate having a property of reflecting light (hereinafter referred to as “reflective substrate”) is used as the substrate 2 a, the light emitted from the side surface s of the light emitting film 1 toward the substrate 2 a is reflected by the substrate surface outside the light emitting film 1. And then flooded. For this reason, the contrast of the peripheral part of the light distribution pattern of the light emitting film 1 is lowered (blurred). However, by providing the groove 21 around the light emitting film 1, it is possible to suppress light reflection on the substrate surface around the light emitting film 1. Therefore, the contrast of the light distribution pattern of the light emitting film 1 can be kept high. When the irradiation range of the laser beam E includes the substrate 2a outside the groove 21, or when the width of the groove 21 is narrow and the light from the side surface s of the light emitting film 1 is reflected by the substrate 2a outside the groove 21, A member that absorbs the laser light E and the fluorescence emitted from the light emitting film 1 may be provided on the surface of the substrate 2a where the light emitting film 1 is not disposed.

Further, the groove 21 is provided in the substrate 2 before the ink 10 is applied to the substrate 2, and the shape controllability of the side in contact with the light emitting film 1 among the sides of contact between the groove 21 and the substrate 2a is increased. It is possible to suppress the collapse of the shape of the light emitting film 1 due to the bleeding of the ink 10 on the substrate 2a.

Further, when the ink 10 oozes out into the groove 21, the phosphor particles P carried together with the ink 10 are stored in the groove 21. Thereby, the arrangement | sequence collapse of the fluorescent substance particle in the peripheral part of the light emitting film 1 by the bleeding of the ink 10 can be suppressed. This effect also contributes to suppressing the collapse of the shape of the light emitting film 1.

[Embodiment 3]
A third embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Method for Manufacturing Light-Emitting Film 1 in Light-Emitting Device 5b >>
Here, a manufacturing method of the light emitting film 1 different from the manufacturing method in the first and second embodiments will be described. Also in the manufacturing method of the present embodiment, the light-emitting film 1 whose shape is controlled similarly to the light-emitting film 1 in the first embodiment can be manufactured.

FIG. 9 is a cross-sectional view showing a method for manufacturing the light emitting film 1 in the light emitting device 5b of the present embodiment.

In FIG. 9, only one layer of the phosphor particles P is shown. However, other phosphor particles P may be stacked on the Z axis positive direction side.

As shown in FIG. 9, a coating layer 22 containing a coating agent with high oil repellency is provided on the surface of the substrate 2 facing the light emitting film 1 containing the phosphor particles P described above. The light emitting film 1 is formed by applying an ink containing the phosphor particles P to the surface of the coating layer 22 in the same manner as the manufacturing method described above.

The coating agent contains a general fluorine-based material such as polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), and perfluoroethylene propene copolymer (FEP).

By providing the coating layer 22 on the substrate 2, the wettability between the substrate 2 and the ink is deteriorated in the film formation by the above-described filling (application) of the ink, and it becomes difficult to spread. Therefore, it is preferable that the material of the coating agent is one that deteriorates the wettability between the substrate 2 and the ink.

The wettability between the solid and the liquid can be defined by a contact angle that is an angle formed between the solid surface and the liquid surface when the liquid is dropped on the solid. The wettability is low (bad) when the contact angle is large, and high when the contact angle is small.

As described above, the light emitting device 5b including the light emitting film 1, the substrate 2, and the coating layer 22 can be manufactured. The light emitting device 5b and the light emitting film 1 manufactured as described above are also included in the technical scope of the present invention.

<< Effects of this embodiment >>
If the frame material 4 (see FIG. 7) is removed from the substrate 2 after applying the ink, the ink may spread on the surface of the substrate 2. In this case, the phosphor particles P also spread with the ink, and the shape of the side surface s of the light emitting film 1 is broken. However, by providing the coating layer 22 with low wettability on the surface of the substrate 2, it is possible to suppress the phosphor particles P from spreading together with the ink and the shape of the side surface s of the light emitting film 1 from collapsing.

Further, the coating layer 22 may be provided only on the substrate 2 other than the region where the light emitting film 1 is to be formed. Thereby, the ink does not ooze out from the region where the light emitting film 1 is to be formed. Therefore, it can further suppress that the shape of the side surface s of the light emitting film 1 collapses.

As described above, since the ink hardly spreads on the surface of the coating layer 22, it is possible to suppress the deformation of the shape after printing (ink application) (so-called sagging). Thereby, the light emitting film 1 with high shape controllability can be easily manufactured.

[Embodiment 4]
A fourth embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Method for Manufacturing Light-Emitting Film 1 in Light-Emitting Device 5c >>
Here, a manufacturing method of the light emitting film 1 different from the manufacturing method in the first to third embodiments will be described. Also in the manufacturing method of the present embodiment, the light-emitting film 1 whose shape is controlled similarly to the light-emitting film 1 in the first embodiment can be manufactured.

FIG. 10 is a cross-sectional view showing a method for manufacturing the light emitting film 1 in the light emitting device 5c of this embodiment.

In FIG. 10, only one layer of the phosphor particles P is shown. However, other phosphor particles P may be stacked on the Z axis positive direction side.

As shown in FIG. 10, the light emitting film 1 containing the above-described phosphor particles P is provided on the porous substrate 2c. The light emitting film 1 is formed by applying an ink containing phosphor particles P to the surface of the porous substrate 2c, as in the above-described manufacturing method.

The porous substrate 2c has a large number of holes p. The holes p have such a size that the solvent of the ink penetrates but does not allow the phosphor particles P to enter (less than the particle size of the phosphor particles P). Therefore, when ink is applied to the porous substrate 2c, only the ink solvent penetrates into the pores p.

The material of the porous substrate 2c is, for example, porous ceramics such as alumina, silica, and zirconia.

As described above, the light emitting device 5c including the light emitting film 1 and the porous substrate 2c can be manufactured. The light emitting device 5c and the light emitting film 1 manufactured as described above are also included in the technical scope of the present invention.

<< Effects of this embodiment >>
The porous substrate 2c absorbs the ink solvent. For this reason, when forming the light emitting film | membrane 1 by application | coating of an ink, an ink becomes difficult to spread on the porous substrate 2c. Therefore, the shape collapse of the side surface s of the light emitting film 1 due to the spreading of the phosphor particles P together with the ink can be suppressed. In addition, by setting the size of the holes p so that the phosphor particles P do not enter, the phosphor particles P can enter the holes p on the surface of the porous substrate 2c and be arranged at an unexpected position. Sex is excluded. Thereby, the light emitting film 1 with high shape controllability can be formed.

[Embodiment 5]
A fifth embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Method for Producing Light-Emitting Film 1d in Light-Emitting Device 5d >>
Here, a manufacturing method of the light emitting film 1d, which is different from the manufacturing methods in the first to fourth embodiments, will be described. Also in the manufacturing method of the present embodiment, the light-emitting film 1d whose shape is controlled similarly to the light-emitting film 1 in the first embodiment can be manufactured.

FIG. 11 is a cross-sectional view showing a method of manufacturing the light emitting film 1d in the light emitting device 5d of this embodiment.

As shown in FIG. 11, a light emitting film 1d (wavelength converting member) including a plurality of different types of light emitting layers 11 to 13 is formed on the surface of the substrate 2. The light emitting layer 11 (wavelength conversion member) is formed by applying ink containing phosphor particles to the surface of the substrate 2 in the same manner as in the above manufacturing method. The light emitting layer 12 (wavelength conversion member) is formed by applying an ink containing phosphor particles different from the phosphor particles of the light emitting layer 11 so as to cover the light emitting layer 11. The light emitting layer 13 (wavelength conversion member) is formed by applying an ink containing phosphor particles different from the phosphor particles of the light emitting layers 11 to 12 so as to cover the light emitting layer 12. Thus, the light emitting film 1d that emits fluorescence of a plurality of colors is configured.

At least a part of the peripheral edge shape of the light emitting layer (light emitting layer 13 in the example shown in FIG. 11) on the most surface side (Z-axis positive direction side) of the light emitting film 1d has a straight line or a desired curved shape. . That is, in the light emitting film 1d, the distance between the ideal outer edge of the light emitting film 1d and the phosphor particles is less than the allowable value.

(Color rendering properties of light emitted from the light emitting film 1d)
When the color of the excitation light that excites the phosphor particles of the light emitting layers 11 to 13 is, for example, purple (405 nm), the colors of the light emitted from the light emitting layers 11 to 13 are three colors of red, green, and blue (RGB). It may be. In this case, since the light emitted from the light emitting layers 11 to 13 is mixed, the light emitting film 1d can be a white light source.

When the color of the excitation light is, for example, blue (450 nm), the light emitting film 1d is formed so as to include only the light emitting layers 11 to 12, and the color of the light emitted from the light emitting layers 11 to 12 is green. -Two colors of red may be sufficient. In this case, the light emitting film 1d can be a light source with high color rendering properties.

Of the light emitting layers 11 to 13, the light emitting layer having a longer wavelength of emitted light is preferably disposed closer to the substrate 2. The phosphor particles that emit light of a certain wavelength are difficult to be excited even when irradiated with light longer than the wavelength. Therefore, light emitted from one of the light emitting layers 11 to 13 is difficult to be absorbed by the other light emitting layers.

As described above, the light emitting device 5d including the light emitting film 1d and the substrate 2 can be manufactured. The light emitting device 5d and the light emitting film 1d manufactured as described above are also included in the technical scope of the present invention.

<< Effects of this embodiment >>
By using a light emitting layer including phosphor particles that emit fluorescence of different colors (light emitting layers 11 to 13 in the example shown in FIG. 11), the light emitting film 1d can be a light source with high color rendering properties. In particular, since at least a part of the peripheral portion shape of the light emitting layer of the phosphor particles P arranged on the outermost side as viewed from the upper surface of the light emitting film 1d has a straight line or a desired curved shape, the color rendering property is high. Light can be obtained with high shape controllability.

Further, by making the phosphor particles included in the light emitting layer on the most surface side of the light emitting film 1d the same type (the light color emitted from the light emitting layer is the same color), the color uniformity of the entire light emitting region of the light emitting film 1d. Can be increased.

[Embodiment 6]
A sixth embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Method for Manufacturing Light-Emitting Film 1 in Light-Emitting Device 5e >>
Here, a manufacturing method of the light emitting film 1 different from the manufacturing method in the above-described embodiment will be described. Also in the manufacturing method of the present embodiment, the light-emitting film 1 whose shape is controlled similarly to the light-emitting film 1 in the first embodiment can be manufactured.

12A and 12B are diagrams showing a method for manufacturing the light-emitting film 1 in the light-emitting device 5e of the present embodiment, where FIG. 12A shows a top view and FIG. 12B shows a cross-sectional view.

As shown in FIG. 12, the light emitting film 1 and the light shielding member 4 e surrounding the light emitting film 1 are formed on the surface of the substrate 2.

The light shielding member 4e has a shape corresponding to a desired light emitting region shape. The material of the light shielding member 4e is a white pigment, ceramics, black pigment, or the like. The light shielding member 4e is manufactured by a printing method or a coating method.

Since the light shielding member 4e is in contact with the side surface s of the light emitting film 1, the shape of the light shielding member 4e is reflected in the shape of the side surface s of the light emitting film 1. The distortion of one side of the light shielding member 4e from the ideal shape of one side of the light emitting film 1 is equal to or less than a predetermined allowable value (for example, the average particle diameter of the phosphor particles of the light emitting film 1). Therefore, in FIG. 5B, the distance between the ideal surface of the side surface s of the light emitting film 1 and the phosphor particles P can be set to a predetermined allowable value or less.

As described above, the light emitting device 5e including the light emitting film 1, the substrate 2, and the light shielding member 4e can be manufactured. Note that the light-emitting film 1 including the light-emitting device 5e and the light-shielding member 4e manufactured as described above is also included in the technical scope of the present invention.

<< Effects of this embodiment >>
When a reflective substrate is used as the substrate 2, the light emitted from the side surface s of the light emitting film 1 toward the substrate 2 is reflected by the substrate surface outside the light emitting film 1 and projected. For this reason, the contrast of the peripheral part of the light distribution pattern of the light emitting film 1 is lowered (blurred). However, by providing the light shielding member 4 e on the substrate surface around the light emitting film 1, reflection of light on the substrate surface around the light emitting film 1 can be suppressed. Therefore, the contrast of the light distribution pattern of the light emitting film 1 can be kept high.

Further, by providing the light shielding member 4e on the substrate surface before applying the ink to the substrate 2, and increasing the shape controllability of the light shielding member 4e, the light emitting film 1 is manufactured by a technique having low shape controllability such as dispensing. Therefore, the manufacturing cost of the light emitting device 5e can be reduced.

[Embodiment 7]
A seventh embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Configuration of lighting device 3c and effects thereof >>
FIG. 13 is a schematic diagram illustrating a configuration of the illumination device 3c of the present embodiment, in which (a) illustrates a light distribution pattern of the illumination device 3c, and (b) illustrates the light emitting device 5.

As shown in FIG. 13A, the illumination device 3c includes a light emitting device 5 and a light projecting lens 51c (optical element). The light emitted from the light emitting device 5 is projected as the light distribution pattern 6 through the light projection lens 51c. As shown in FIG. 13B, the light distribution pattern 6 is similar to the shape of the light-emitting film 1 when viewed from the Z-axis positive direction side.

The light emitting device 5 may be the above-described light emitting devices 5a to 5e.

As described above, a light distribution pattern having a desired shape can be easily obtained by using a simple light projection system (in the example shown in FIG. 13, the light projection lens 51c) that simply projects the light distribution pattern of the light emitting film 1 as it is. Can be flooded.

[Embodiment 8]
An eighth embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

<< Configuration of Lighting Device 3d >>
FIG. 14 is a schematic diagram illustrating the configuration of the illumination device 3d of the present embodiment, where (a) illustrates the illumination device 3d and its light distribution pattern, and (b) illustrates another light distribution pattern.

As shown in FIG. 14A, the illumination device 3d includes a light emitting device 5f and a light projecting lens 51d (optical element).

The light emitting device 5f includes a rectangular light emitting film 1 as shown in FIG. 5A, a substrate 2, a light guide 31 that guides laser light E, and a laser guided by the light guide 31. The upper structure 32 which has the location (laser beam transmission location) which lets the light E pass, the reflective mirror 33, and the transparent member 35 are provided.

The laser light E is applied to the light emitting film 1 through the light guide 31, the laser light transmitting portion of the upper structure 32, and the reflecting mirror 33. The laser beam E reflected by the light emitting film 1 or the substrate 2 and the fluorescence F emitted from the light emitting film 1 are transmitted through the transparent member 35 and then projected as a light distribution pattern 6a through the light projecting lens 51d. When the laser light E is not used as part of the illumination light of the light emitting device 5f, the wavelength selective filter 34 is provided on the surface of the transparent member 35 to suppress the laser light E from being emitted from the light emitting device 5f. May be.

Here, the light projection lens 51d is a direct projection type light projection optical system. The direct projection method means a method for enlarging and projecting the light source shape. The projection lens 51d enlarges and projects the film shape of the rectangular light-emitting film 1. For this reason, the light distribution pattern 6a is rectangular.

(Application to vehicle headlamps)
As shown in FIG. 14B, the light distribution pattern 6b can be made to coincide with a low beam light distribution pattern for vehicles or the like stipulated by laws and regulations in Japan or the like. Specifically, the film shape of the light emitting film 1 of the lighting device 3d may be controlled to a shape similar to the low beam light distribution pattern.

Alternatively, for example, a light distribution pattern having a straight line can be easily formed by forming the peripheral portion of the light emitting film 1 to be a straight line, and using the straight line portion for projecting light to a portion where linearity is required in the light distribution pattern. Can get to. In this case, a light distribution pattern of a low beam is formed by combining enlarged light emitting region shapes. For example, a plurality of rectangular light distribution patterns 6a as shown in FIG. 14A are projected while shifting their projection positions, thereby forming a low beam light distribution pattern 6b. In order to form this light distribution pattern 6b, the light distribution member 6d is projected so that the light distribution pattern 6a of the illumination device 3d is projected onto a plurality of different positions and all the projected images are combined to form a desired light distribution pattern. design. Alternatively, a plurality of illumination devices 3d may be arranged in three dimensions so as to correspond to the light distribution pattern 6b, and the light distribution pattern 6a may be projected from each of the plurality of illumination devices 3d.

<< Effect of lighting device 3d >>
In the direct projection method, since the light source shape is enlarged and projected, it is necessary to strictly control the light source shape in order to obtain a light distribution pattern having a desired shape. Since the light emitting film 1 has high shape controllability at the peripheral edge as described above, it can be formed, for example, so that the peripheral edge is a straight line. By using the straight line portion for light projection to a portion (boundary portion) where linearity is required in the light distribution pattern, a light distribution pattern with high shape controllability can be obtained.

As described above, the energy density of the laser light E is higher than the energy density of the excitation light emitted from a light source other than the laser element. Therefore, the area of the light emitting film 1 that receives the laser light E and emits fluorescence can be made smaller than the area of the light emitting film that receives other types of excitation light and emits the same amount of fluorescence.

As the light emitting film 1 is miniaturized, the light emitting region of the light emitting film 1 is enlarged and distributed with high magnification. Therefore, the influence of the shape of the light emitting film 1 on the light distribution patterns 6a and 6b of the lighting device 3d is increased. In such a case, the lighting device 3d is particularly useful.

Further, since the shape of the light projected from the illumination device 3d is controlled with high accuracy, the light distribution pattern defined by the regulations can be efficiently realized without using the light shielding plate. Therefore, the illuminating device 3d is suitable for a vehicle headlamp.

[Summary]
The wavelength conversion member (light-emitting films 1 and 1d) according to the first aspect of the present invention is a wavelength conversion member including a fluorescent material, and the surface of the side surface s with respect to the upper surface is a wide surface of the wavelength conversion member. The ideal surface of the side surface, which is derived from an array of a plurality of particles (phosphor particles P, P1, and P2) of the fluorescent material to be formed, is an ideal surface, and the distance between the ideal surface and each of the particles Is less than the allowable value d.

The inventors have determined that the light distribution pattern of the wavelength conversion member including the fluorescent material depends on the particle arrangement of the fluorescent material at the peripheral edge (side surface) of the wavelength conversion member. It was found that the particle arrangement of the particles needs to be strictly controlled.

According to the above configuration, the distance between the ideal surface and the particle is less than or equal to the allowable value at the peripheral edge of the wavelength conversion member. Therefore, on the side surface, the particles are arranged within an allowable range from the desired shape. . Therefore, a desired light distribution pattern reflecting the high shape controllability of the wavelength conversion member can be realized.

In the wavelength conversion member according to aspect 2 of the present invention, in the aspect 1, the allowable value may be an average particle diameter of the particles.

In the wavelength conversion member according to aspect 3 of the present invention, in the above aspect 1 or 2, the distance between the ideal surface and each particle is a distance between the ideal surface and the center of each particle. Good.

In the wavelength conversion member according to aspect 4 of the present invention, in the above aspect 1 or 2, the distance between the ideal surface and each of the particles is calculated for each of the plurality of particles. It may be the distance between the surface point of the particle closest to the surface.

In the wavelength conversion member according to Aspect 5 of the present invention, in any one of Aspects 1 to 4, the approximate plane assumed from the envelope ENV formed by the surfaces of the plurality of particles may be the ideal plane.

In the wavelength conversion member according to aspect 6 of the present invention, in any one aspect of the above aspects 1 to 5, the ideal surface may be a flat surface.

The wavelength conversion member of the present invention is a wavelength conversion member (light-emitting film 1 · 1d) containing a fluorescent material, and a basic reference line (straight line l; curve m; line n) indicating the desired shape of the wavelength conversion member. Of the wavelength conversion member in the predetermined reference direction D from the inside to the outside of the wavelength conversion member or the opposite direction thereof, the wide surface of the wavelength conversion member is the upper surface, and the surface of the side surface s with respect to the upper surface Outer reference line (line Ca) which is the tangent line closest to the reference direction in the reference direction side tangent group on the surface of the plurality of fluorescent substance particles (phosphor particles P, P1, P2) forming The distance between the line group and the inner reference line (line Cb) which is the tangent line on the most opposite side of the tangent group may be equal to or less than a predetermined allowable value d.

A light-emitting device according to aspect 7 of the present invention includes the wavelength conversion member (light-emitting film 1 or 1d) according to any one of aspects 1 to 6, the light-shielding member 4e in contact with the side surface of the wavelength conversion member, and the wavelength conversion. And a substrate 2 or 2a (porous substrate 2c) on which the light shielding member is disposed.

A light-emitting device according to an eighth aspect of the present invention includes the wavelength conversion member (light-emitting film 1 or 1d) according to any one of the first to sixth aspects and the wavelength conversion member, and a groove 21 along the wavelength conversion member. And a substrate 2 · 2a (porous substrate 2c).

In the light emitting device according to aspect 9 of the present invention, in the aspect 7 or 8, the substrate may include an oil-repellent coating layer 22 on a surface on which the wavelength conversion member is disposed.

In the light emitting device according to Aspect 10 of the present invention, in any one of Aspects 7 to 9, the substrate may have pores p smaller than the particles on at least the surface thereof.

In the light emitting device according to aspect 11 of the present invention, in any one of the above aspects 7 to 10, the wavelength conversion member includes a plurality of layers (light emitting layers 11 to 13) each including a different kind of fluorescent material. It's okay.

Illumination devices 3a to 3d according to aspect 12 of the present invention include light emitting devices 5 and 5a to 5f according to any one of aspects 7 to 11, and an optical element that projects light emitted from the light emitting device (projection lens). 51a, 51c, 51d; light reflector 51b).

A vehicle headlamp according to aspect 13 of the present invention includes the illumination device according to aspect 12.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

1, 1d Light emitting film (wavelength conversion member)
2, 2a Substrate 2c Porous substrates 3a to 3d Illuminating device 4 Frame member 4e Light shielding member 5, 5a to 5f Light emitting device 10 Ink 11 to 13 Light emitting layer (wavelength converting member)
21 Groove 22 Coating layer 41 Gap 51a, 51c, 51d Light projection lens (optical element)
51b Reflector for light projection (optical element)
Ca wire (outside reference line)
Cb line (inner reference line)
D Reference direction ENV Envelopes P, P1, P2 Phosphor particles (particles)
d Tolerance l Straight line (basic reference line)
m Curve (basic reference line)
n-line (basic reference line)
p Holes side

Claims (13)

1. A wavelength conversion member containing a fluorescent material,
   With the wide surface of the wavelength conversion member as an upper surface, the ideal surface of the side surface derived from an array of a plurality of particles of the fluorescent material that forms the surface of the side surface with respect to the upper surface is an ideal surface,
   The wavelength conversion member, wherein a distance between the ideal surface and each of the particles is an allowable value or less.
2. 2. The wavelength conversion member according to claim 1, wherein the allowable value is an average particle diameter of the particles.
3. The wavelength conversion member according to claim 1 or 2, wherein the distance between the ideal surface and each particle is a distance between the ideal surface and the center of each particle.
4. The distance between the ideal surface and each of the particles is a distance between the ideal surface and a point on the surface of the particle closest to the ideal surface, calculated for each of the plurality of particles. The wavelength conversion member according to claim 1 or 2, characterized by the above.
5. The wavelength conversion member according to any one of claims 1 to 4, wherein an approximate surface assumed from an envelope formed by the surfaces of the plurality of particles is the ideal surface.
6. The wavelength conversion member according to any one of claims 1 to 5, wherein the ideal surface is a flat surface.
7. The wavelength conversion member according to any one of claims 1 to 6,
   A light shielding member in contact with the side surface of the wavelength conversion member;
   A substrate on which the wavelength conversion member and the light shielding member are disposed;
   A light emitting device comprising:
8. The wavelength conversion member according to any one of claims 1 to 6,
   A substrate on which the wavelength converting member is arranged and having a groove along the wavelength converting member;
   A light emitting device comprising:
9. The light-emitting device according to claim 7 or 8, wherein the substrate includes an oil-repellent coating layer on a surface on which the wavelength conversion member is disposed.
10. 10. The light emitting device according to claim 7, wherein the substrate has pores smaller than the particles on at least a surface thereof.
11. The light emitting device according to any one of claims 7 to 10, wherein the wavelength conversion member includes a plurality of layers each including different types of fluorescent substances.
12. A light emitting device according to any one of claims 7 to 11,
    An illumination device comprising: an optical element that projects light emitted from the light emitting device.
13. A vehicle headlamp provided with the illumination device according to claim 12.

Images