JP2010152282A - Lens, light source device, and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens having high light distribution controllability without causing color irregularities and to provide a light source device and an illumination device. <P>SOLUTION: The light source device 100a includes an LED 15a and the lens 200a. The lens 200a includes an incident part 201 including at least a first incident surface 20a located in front of the LED 15a and a second incident surface 30 surrounding the first incident surface 20a, a reflecting surface 40 mainly reflecting light from the second incident surface 30, and a light-emitting surface 50a emitting the light from the incident part 201 and the reflecting surface 40. The cross-section shape of the first incident surface 20a is symmetrical with respect to the optical axis 10 of the LED 15a and the first incident surface 20a has such a projecting shape that it is nearest to the LED 15a in a position away from the optical axis 10 of the LED 15a in the cross-section shape. By such a shape, in the first incident surface 20a and the reflecting surface 40, independent light distribution control is possible. The light source device 100a has the remarkable effect of reducing the color irregularities of an irradiation surface and having high light distribution controllability. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens, a light source device, and an illuminating device used for illumination using, for example, an LED (Light Emitting Diode) as a light source.

  In recent years, LEDs have begun to be used as light sources for light source devices. A white LED is an LED element that emits blue light mounted on a package of resin, metal, ceramics, or the like. A phosphor is applied in the package so as to cover the LED element, and the blue light emitted from the LED element is wavelength-converted into yellow light by the phosphor. In such an LED, the distance that the blue light passes through the phosphor varies depending on the emission direction from the LED element, and the irradiated light includes white light with strong blue and white light with strong yellow. For this reason, uneven color occurs on the irradiated surface of the LED.

Therefore, in the conventional light source device, a lens subjected to light diffusion processing is disposed in front of the white LED (for example, Patent Document 1).
JP 2007-5218 A

  The light source device as described above has a problem that the controllability of light distribution is deteriorated because light diffusion processing is performed.

  The present invention has been made, for example, in order to solve the above-described problems, and an object of the present invention is to obtain a lens, a light source device, and an illumination device that have high light distribution controllability without causing color unevenness.

  The lens according to the present invention is a lens including an incident portion that receives light from a light source, and the incident portion has a convex portion at at least two points equidistant from the lens axis with the lens axis in between. An incident surface and a second incident surface surrounding the first incident surface.

  According to the present invention, for example, it is possible to obtain a lens, a light source device, and a lighting device that do not cause color unevenness and have high light distribution controllability.

Embodiment 1 FIG.
Describes a lens that emits light of different colors emitted from a light source, emits light of different colors in the front direction and the outer direction, respectively, and reduces color unevenness on the irradiated surface, and a light source device including the lens To do.

FIG. 1 is an external view of a light source device 100a according to the first embodiment.
The configuration of light source device 100a in the first embodiment will be described below with reference to FIG.

The light source device 100a includes an LED 15a and a lens 200a.
The lens 200a is disposed in front of the LED 15a (the side on which the LED 15a emits light).
The LED 15a and the lens 200a are positioned by a highly reflective lens holder (not shown), and the optical axis 10 of the LED 15a and the axis of the lens 200a coincide (or substantially coincide).

The LED 15a emits white light.
The lens 200a causes the light emitted from the LED 15a to be incident on the incident portion 201, reflects the incident light on the reflection surface 40, and emits the reflected light from the emission surface 50a (an example of the emission portion).

FIG. 2 is a diagram showing the LED 15a in the first embodiment.
FIG. 2A is a plan view of the LED 15a. FIG. 2B is a cross-sectional view of the LED 15a, and shows a cross-sectional view taken along line AA ′ of FIG.
The LED 15a in the first embodiment will be described below based on FIG.

The LED 15a includes a ceramic package 1 and an LED element 2a.
The ceramic package 1 has a cylindrical recess 6 at the center, and the LED element 2 a is disposed at the center of the recess 6 of the ceramic package 1. The recess 6 of the ceramic package 1 is filled with a silicone resin (not shown) mixed with a phosphor (hereinafter referred to as “phosphor 3”).
The LED element 2a is a light emitter that emits blue light, and the phosphor 3 converts the wavelength of the blue light emitted from the LED element 2a into yellow light.

  The ceramic package 1 has an electrode for power supply, and supplies the power applied to the electrode to the LED element 2a via a wire (illustration of the electrode and the wire is omitted).

FIG. 3 is a cross-sectional view of the light source device 100a according to Embodiment 1, and shows a cross section including the optical axis 10 of the LED 15a.
The three-dimensional shape of the lens 200a and the cross-sectional shape of the lens 200a formed by the cross-section including the optical axis 10 of the LED 15a will be described below with reference to FIGS.

As shown in FIG. 1, the lens 200a is a rotating body with the optical axis 10 as the center of rotation, and has a bell shape or a cup shape. However, the lens 200a is not a hollow object such as a bell or a cup, as shown in FIG.
The lens 200a is made of a transparent material (lens material) such as acrylic resin, polycarbonate resin, or glass.
There may not be the collar part 51 (refer FIG. 3) provided in the output surface 50a side.

As shown in FIG. 1, the incident portion 201 of the lens 200 a has a rotating body shape with the optical axis 10 as the center of rotation. The incident portion 201 is a recess that forms a bowl shape, a dish shape, or a crater shape on the top portion of the lens 200a by recessing the top portion of the lens 200a.
The incident part 201 includes a first incident surface 20a and a second incident surface 30, and makes light emitted from the LED 15a enter the lens 200a.
The first incident surface 20a is located at the center of the incident portion 201, and the second incident surface 30 is located so as to surround the first incident surface 20a.

As shown in FIG. 1, the first incident surface 20 a is a raised convex surface that forms a surface shape of a rotating body with the optical axis 10 as the center of rotation. The first incident surface 20a has a depressed center point that intersects the optical axis 10.
As shown in FIG. 3, the first incident surface 20 a has a cross-sectional shape that is symmetrical about the optical axis 10, and includes two circular arc shapes that intersect on the optical axis 10. The two arcs included in the cross section of the first incident surface 20a have a specific point B (excluding a point on the optical axis 10) in the lens 200a as the center of the circle.
The first incident surface 20a is located on the inner side of the auxiliary line E that connects the LED 15a and the end of the reflecting surface 40 (on the emission surface 50a side). Thereby, the 1st incident surface 20a does not prevent that the light from LED15a injects into the 2nd incident surface 30, and totally reflects in the direction orthogonal to the output surface 50a by the reflective surface 40. FIG. That is, the size of the first incident surface 20a is a size that does not interfere with the light incident from the second incident surface 30 and totally reflected by the reflecting surface 40.

The convex shape of the cross section of the first incident surface 20 a is such that the point closest to the LED element 2 a (hereinafter referred to as “vertex C”) is not on the optical axis 10 and the vertex C is away from the optical axis 10. The three-dimensional shape of the first incident surface 20a is a shape obtained by rotating the convex cross section around the optical axis 10 as a rotation axis.
Moreover, the 1st entrance plane 20a is provided in the position where the vertex C opposes the recessed part 6 of LED15a in cross-sectional shape.
Further, the convex shape of the cross section of the first incident surface 20a is substantially the shape near the vertex C with the parallel axis D passing through the vertex C and parallel to the optical axis 10 as the center.

  For example, the three-dimensional shape of the first incident surface 20a is a shape obtained by rotating the convex surface of a plano-convex lens having a focal point in the phosphor 3 of the LED 15a (or on the surface of the phosphor 3) using the optical axis 10 as a rotation axis. .

As shown in FIG. 1, the second incident surface 30 is a concave surface that is recessed by forming a surface shape of a rotating body with the optical axis 10 as the center of rotation, and a part of the spherical surface with the LED element 2 a at the center. It is a shape cut out in a ring shape.
As shown in FIG. 3, the second incident surface 30 has a cross-sectional shape that is symmetric about the optical axis 10, and the cross-section has a shape of two arcs. The circular arc of the cross section formed by the second incident surface 30 is centered on the LED element 2a.

As shown in FIG. 1, the reflecting surface 40 of the lens 200a has a surface shape of a rotating body with the optical axis 10 as the center of rotation, and constitutes a peripheral portion of the lens 200a.
The reflecting surface 40 includes a parabolic shape whose cross-sectional shape is focused on the LED element 2a (see FIG. 3).
The reflecting surface 40 reflects the light incident from the incident part 201 into the lens 200a into the lens 200a.

The exit surface 50a of the lens 200a is a circular plane centered on the optical axis 10, and is a plane substantially parallel to the LED 15a (the ceramic package 1).
The emission surface 50a emits the light that has entered the lens 200a from the incident portion 201 to the outside of the lens 200a.

FIG. 4 is a diagram showing the hue of light emitted from the LED 15a in the first embodiment.
The color shade of the LED 15a that differs at the emission position will be described below with reference to FIG.

The LED element 2a emits blue light 11 from the center of the recess 6 of the LED 15a.
The blue light 11 emitted from the LED element 2a becomes white light with a strong yellowishness because the proportion of light that is wavelength-converted to yellow increases as the distance passing through the phosphor 3 filled in the recess 6 increases. .
The white light 12a emitted from the vicinity of the optical axis 10 of the LED 15a has a strong bluish color because the distance passing through the phosphor 3 is short. Moreover, since the white light 12b emitted from the vicinity of the side portion of the LED 15a has a long distance to pass through the phosphor 3, the yellow light is strong.

FIG. 5 is a diagram showing the light emission direction from the lens 200a in the first embodiment, and shows a cross section including the optical axis 10 of the LED 15a.
The direction in which the light incident from the first incident surface 20a is emitted from the lens 200a and the direction in which the light incident from the second incident surface 30 is emitted from the lens 200a will be described below with reference to FIG.

  First, white light (light 21 and light 23) emitted from the point F near the center of the LED 15a toward the lens 200a will be described. The light emitted from the point F is white light with strong bluishness.

The bluish light 21 emitted from the point F of the LED 15a and incident on the second incident surface 30 has the second incident surface 30 because the second incident surface 30 forms a part of a sphere centered on the LED element 2a. And enters the lens 200a without being refracted. The light 21 that has entered the lens 200 a from the second incident surface 30 reaches the reflecting surface 40. The light 21 that has reached the reflecting surface 40 from the second incident surface 30 has a rotating shape in which the reflecting surface 40 rotates a parabola with the LED element 2a as a focal point about the optical axis 10 as a rotation axis. Total reflection is performed in a direction substantially parallel to the optical axis 10. The light 21 reflected by the reflecting surface 40 reaches the emitting surface 50a. The light 21 that has reached the emission surface 50a from the reflecting surface 40 is emitted from the lens 200a in a direction substantially parallel to the optical axis 10 without being substantially refracted by the emission surface 50a because the emission surface 50a is substantially orthogonal to the optical axis 10.
That is, the bluish light 21 emitted from the point F of the LED 15a and incident on the second incident surface 30 illuminates the front surface of the lens 200a facing the emission surface 50a.

The bluish light 23 emitted from the point F of the LED 15a and incident on the first incident surface 20a has an arc shape in which the first incident surface 20a is focused on a point in the LED 15a (except for a point near the center of the LED 15a). Therefore, the light is refracted at a deeper angle when it reaches the first incident surface 20a and enters the lens 200a. The light 23 incident on the lens 200a from the first incident surface 20a reaches the output surface 50a. The light 23 that has reached the exit surface 50 a from the first entrance surface 20 a is further refracted by the exit surface 50 a and exits in a direction inclined from the optical axis 10.
That is, the bluish light 23 emitted from the point F of the LED 15a and incident on the first incident surface 20a illuminates the periphery of the front surface of the lens 200a.

  As described above, the bluish white light (for example, the lights 21 and 23) emitted from the vicinity of the center of the LED 15a illuminates the front surface of the lens 200a and its surroundings.

  Next, white light (light 22, light 24) emitted toward the lens 200a from the point G from the side of the LED 15a will be described. The point G is a point located near the front of the vertex C of the first incident surface 20a. The light emitted from the point G is white light with strong yellowness.

The strongly yellowish light 22 emitted from the point G of the LED 15a and incident on the second incident surface 30 has a second incident surface because the second incident surface 30 forms a part of a sphere centered on the LED element 2a. The light is refracted at a deep angle at 30 and enters the lens 200a. The light 22 incident on the lens 200 a from the second incident surface 30 reaches the reflecting surface 40. The light 22 that has reached the reflecting surface 40 from the second incident surface 30 has a rotating shape in which the reflecting surface 40 rotates a parabola with the LED element 2a as a focal point about the optical axis 10 as a rotation axis. Total reflection is performed in a direction inclined with respect to the optical axis 10. The light 22 reflected by the reflecting surface 40 reaches the emitting surface 50a. The light 22 reaching the emission surface 50a from the reflection surface 40 is refracted at a deep angle at the emission surface 50a and emitted in a direction inclined with respect to the optical axis 10 because the emission surface 50a is orthogonal to the optical axis 10.
That is, the strong yellowish light 22 emitted from the point G of the LED 15a and incident on the second incident surface 30 illuminates the periphery of the front surface of the lens 200a.

The strong yellowish light 24 emitted from the point G of the LED 15a and incident on the first incident surface 20a has a convex lens shape in which the first incident surface 20a is focused on a point in the LED 15a (except for a point near the center of the LED 15a). Therefore, the light is refracted in the direction substantially parallel to the optical axis 10 at the first incident surface 20a and enters the lens 200a. The light 24 incident on the lens 200a from the first incident surface 20a reaches the output surface 50a. The light 24 that has reached the exit surface 50a from the first entrance surface 20a is not refracted at the exit surface 50a and exits in a direction substantially parallel to the optical axis 10 because the exit surface 50a is orthogonal to the optical axis 10. .
That is, the yellowish light 24 emitted from the point G of the LED 15a and incident on the first incident surface 20a illuminates the front of the lens 200a.

  As described above, the strong yellowish white light (for example, the light 22 and the light 24) emitted from the vicinity of the side portion of the LED 15a illuminates the front surface of the lens 200a and its surroundings.

Therefore, the strong white light emitted from the LED 15a and the strong white light emitted from the LED 15a overlap each other on the front surface of the lens 200a and the periphery thereof to cancel the blueness and yellowness.
Thereby, the irradiated surface is illuminated with high-quality white light with little color unevenness.

In other words, the color of the light that is incident from the second incident surface 30 of the lens 200a, is reflected by the reflecting surface 40, and is emitted from the emitting surface 50a changes depending on the inclination with respect to the optical axis 10. For this reason, the light emitted from the lens 200a through the reflecting surface 40 is irradiated with white light having a strong bluish color in the vicinity of the front surface of the lens 200a, and the white light having a strong yellowish color surrounds the light. Unevenness occurs.
Furthermore, the color of the light incident from the first incident surface 20a of the lens 200a and emitted from the output surface 50a changes depending on the inclination with respect to the optical axis 10. For this reason, the light emitted from the lens 200a through the first incident surface 20a irradiates the front surface of the lens 200a with white light having a strong yellow tint on the irradiation surface, and the white light having a strong blue tint surrounds it. Color unevenness occurs.
Then, the color unevenness of light emitted from the lens 200a via the reflecting surface 40 and the color unevenness of light emitted from the lens 200a via the first incident surface 20a cancel each other.
The light source device 100a can emit high-quality light with little color unevenness on the irradiation surface.

In the above description, the first incident surface 20a of the lens 200a has been described in a form in which two circular arcs are in contact with each other at one point on the optical axis 10 in a cross-sectional shape (for example, see FIG. 3).
However, the first incident surface 20a of the lens 200a may be separated in the cross-sectional shape without contacting the two arcs.
The light distribution control for adjusting the high illuminance range can be performed by moving the two arcs formed by the cross-sectional shape of the first incident surface 20a closer to or away from each other.

FIG. 6 is a diagram showing light distribution control of the light source device 100a in the first embodiment.
The light distribution control of the light source device 100a in the first embodiment will be described below with reference to FIG.

(A) shows an illuminance graph when two arcs formed by the cross-sectional shape of the first incident surface 20a are in contact with each other.
(B) shows an illuminance graph when two arcs formed by the cross-sectional shape of the first incident surface 20a are separated from each other.

The graph 13A indicates the illuminance of light incident on the first incident surface 20a, and the graph 13B indicates the illuminance of light incident on the second incident surface 30.
The superposition of the graph 13A and the graph 13B is the illuminance of the light source device 100a.

The arc portion of the first incident surface 20a corresponds to the portion where the illuminance of light incident on the first incident surface 20a is high.
That is, the light distribution control for adjusting the high illuminance range can be performed by moving the two arcs of the first incident surface 20a having a cross-sectional shape closer to or away from each other.

In the first embodiment, the following light source device 100a has been described.
The light source device 100a includes a light source (LED 15a) and a lens 200a.
The lens 200a is composed of at least a first incident surface 20a located in front of the light source and a second incident surface 30 surrounding the first incident surface 20a, and a light incident portion (incident portion 201) that takes in light from the light source, It mainly includes a reflection surface 40 that reflects light from the second incident surface 30, and an emission surface 50 a that emits light from the light incident portion and the reflection surface 40.
The first incident surface 20a has a cross-sectional shape that is symmetric with respect to the optical axis 10 of the light source, and has two or more convex shapes that are closest to the light source at positions away from the optical axis 10 of the light source in the cross-sectional shape.
The shape of the first incident surface 20a is rotationally symmetric with respect to the optical axis 10 of the light source.
With this configuration, the light source device 100a can control the light distribution of the light from the light source by the lens 200a, improve the symmetry of the color of the irradiated surface, and reduce the uneven color of the irradiated surface.

FIG. 7 is a diagram illustrating color unevenness caused by the conventional light source device 100i.
When the light source device 100i in which the lens 200i does not have the first incident surface and the second incident surface is used, as shown in FIG. 7, the irradiation surface 400 is caused by the light 500 with strong blue and the light 501 with strong yellow. Color unevenness occurs.

  The light source device 100a described in the first embodiment and the light source device described in the following embodiments have an effect of reducing color unevenness as shown in FIG.

  The cross-sectional shape of the first incident surface 20 a and the cross-sectional shape of the second incident surface 30 may not be symmetrical with the optical axis 10 as the center.

The LED element 2a is not limited to emitting blue light, and the emission color may be other than blue.
Further, the light source is not limited to the LED 15a, and a halogen light bulb or the like may be used.

Embodiment 2. FIG.
A light source device in which the shape of the first incident surface of the lens is different from that of the first embodiment will be described.
Hereinafter, items different from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals. Matters whose description is omitted are the same as those in the first embodiment.

FIG. 8 is an external view of the light source device 100c in the second embodiment.
The shape of the first incident surface 20c in the second embodiment will be described below based on FIG.

The first incident surface 20c has a plurality of convex portions that have a part of a spherical surface and are raised, and has a shape in which the plurality of convex portions are arranged in an annular shape.
For example, the shape of the first incident surface 20 c is a shape in which a plurality of convex lenses having a line parallel to the optical axis 10 as an axis are provided. In FIG. 8, a shape in which four convex lenses are arranged is shown as the shape of the first incident surface 20c. However, the number of convex lenses constituting the first incident surface 20c may be two, three, or five or more.

The shape of a cross section including the optical axis 10 and including the vertices of two convex portions facing each other across the optical axis 10 among the plurality of convex portions (convex lenses) of the first incident surface 20c is shown in the first embodiment. This is the same as in FIG.
As in the first embodiment, the first incident surface 20c of the lens 200c refracts the light emitted from the LED 15a, enters the lens 200c, and emits the light from the emission surface 50a.

By appropriately adjusting the number and size of the plurality of convex portions provided on the first incident surface 20c, the distance between them, and the like, the color unevenness of the irradiated surface due to light emitted from the lens 200c via the first incident surface 20c is controlled. can do.
That is, the light emitted from the lens 200c through the first incident surface 20c can easily cancel the uneven color of the irradiated surface due to the light emitted from the lens 200c through the second incident surface 30. The light source device 100c that extracts high-quality light with less unevenness can be easily obtained.

  As in the first embodiment, the plurality of convex portions on the first incident surface 20c may be in contact with adjacent or opposing convex portions, or may be separated from the adjacent or opposing convex portions.

Embodiment 3 FIG.
A light source device in which an LED has a plurality of LED elements and the shape of the first incident surface of the lens has a shape corresponding to the arrangement of the plurality of LED elements is described.
Hereinafter, items different from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals. Matters whose description is omitted are the same as those in the first embodiment.

FIG. 9 is an external view of the light source device 100b according to the third embodiment.
As shown in FIG. 9, the shape of the incident portion 201 in the third embodiment is not symmetrical about the optical axis 10 but is symmetrical about the optical axis 10.

FIG. 10 is a diagram illustrating the LED 15b according to the third embodiment.
FIG. 10A is a plan view of the LED 15b. FIG.10 (b) is sectional drawing of LED15b, and has shown AA 'sectional drawing of (a). FIG.10 (c) is a figure which shows the hue of the white light 12 in LED15b.
The LED 15b in the third embodiment will be described below based on FIG.

The LED 15b includes six LED elements 2b as shown in FIG.
Six LED elements 2b are arranged in two rows of three, and three LED elements 2b arranged in two rows are alternately arranged between the rows.
Hereinafter, the direction in which the three LED elements 2b are vertically arranged is referred to as “x-axis direction”, and the direction in which the three LED elements 2b are horizontally arranged in two rows is referred to as “y-axis direction”.
The LED 15b is disposed in parallel with the xy plane.
Six LED elements 2b are arranged in the x-axis direction and three in the y-axis direction.

For this reason, as shown in (c), the color of the white light 12 in the LED 15b differs for each range. The range of hue is represented by an elliptical shape extending in the x-axis direction.
(C) shows that the white light 12 in the LED 15b has little color unevenness in the x-axis direction and large color unevenness in the y-axis direction.
The range close to the center of the LED 15b is strong blue, and the range far from the center of the LED 15b is strong yellow.

FIG. 11 is a perspective view of the lens 200b according to the third embodiment.
FIG. 12 is a cross-sectional view of the lens 200b according to the third embodiment, and shows a z-y cross section including the optical axis 10 of the LED 15b.
The shape of the lens 200b in the third embodiment will be described below with reference to FIGS.

  Hereinafter, the direction of the optical axis 10 is referred to as “z-axis direction”.

As shown in FIG. 11, the first incident surface 20 a has two kamaboko-shaped convex surfaces extending in the x-axis direction, and the two convex portions are arranged side by side in the y-axis direction. A semi-cylindrical convex lens is called a cylindrical lens.
That is, the shape of the first incident surface 20a is the same shape as the convex surfaces of the two cylindrical lenses arranged side by side.
The first incident surface 20a is a convex surface having a shape corresponding to the arrangement of the LED elements 2b.

As shown in FIG. 12, the first incident surface 20a has the same z-y cross-sectional shape as that of the first embodiment (see FIG. 3).
The first incident surface 20a is a shape obtained by extending the shape of the yz cross section shown in FIG. 12 in the x-axis direction.

Therefore, as in the first embodiment, the light source device 100b cancels the hue between the light emitted from the lens 200b via the first incident surface 20b and the light emitted from the lens 200b via the second incident surface 30. In addition, color unevenness in the y-axis direction of the irradiated surface is reduced.
Furthermore, since the light source device 100b has little color unevenness of the light emitted from the LED 15b in the x-axis direction as described with reference to FIG. 10, the color unevenness of the irradiated surface in the x-axis direction is small.
Therefore, the light source device 100b can reduce uneven color on the irradiation surface parallel to the xy plane.

Hereinafter, the above-described operation and effect will be described in detail.
The first incident surface 20b has a convex shape of a cylindrical lens having a focal point at a position away from the optical axis 10 in the concave portion 6 of the LED 15b and extending in the x-axis direction.
The light emitted from the LED 15b and reaching the first incident surface 20b is refracted in the y-axis direction to be emitted from the emission surface 50a, and from white light with a strong yellowish color as it moves away from the front surface of the lens 200b in the y-axis direction. Color unevenness that changes to strong white light is generated on the irradiated surface.
On the other hand, the light that has reached the reflecting surface 40 via the second incident surface 30 is totally reflected and emitted from the emitting surface 50a, and from the white light with a strong blue color to the yellowish color as it moves away from the front surface of the lens 200b in the y-axis direction. Color unevenness that changes to strong white light is generated on the irradiated surface.
The first incident surface 20b is symmetric with respect to the optical axis 10 and has a z-y cross-sectional shape including two convex portions having a vertex C closest to the LED 15b at a position away from the optical axis 10, and parallel to the LED 15b. The shape extends in one direction (x-axis direction).
For this reason, the light source device 100b cancels the color unevenness of the light emitted from the lens 200b via the first incident surface 20b and the color unevenness of the light emitted from the lens 200b via the second incident surface 30 to each other. High-quality light with little unevenness can be emitted to the irradiation surface. In particular, since the light source device 100b includes the lens 200b having the first incident surface 20b as a convex surface extending in the axial direction with little color unevenness in the LED 15b, the LED 15b including a plurality of LED elements 2b is provided. A remarkable effect is obtained when the color unevenness in the LED 15b is different between the x-axis and the y-axis as in the case of being used for a light source.

As in the first embodiment, the two convex portions of the first incident surface 20b may be in contact with each other or may be separated from each other.
As in the first embodiment, the light source device 100b can control light distribution of light emitted through the first incident surface 20b by adjusting the first incident surface 20b independently of the second incident surface 30. Therefore, the light distribution controllability is high.

Embodiment 4 FIG.
A light source device in which a concave portion is provided on the exit surface of the lens will be described.
Hereinafter, items different from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals. Matters whose description is omitted are the same as those in the first embodiment.

FIG. 13 is an external view of a light source device 100d according to the fourth embodiment.
FIG. 14 is a cross-sectional view of light source device 100d and a plan view of lens 200d in the fourth embodiment.
FIG. 14A shows the shape of the light source device 100d formed by a cross section including the optical axis 10 of the LED 15a. FIG. 14B shows the recess 60 of the emission surface 50 b from the direction of the optical axis 10.
The cross-sectional shape of the lens 200d formed by the three-dimensional shape of the lens 200d and the cross-section including the optical axis 10 of the LED 15a will be described below with reference to FIGS.

  As shown in FIG. 13, the lens 200d is a rotating body with the optical axis 10 as the center of rotation, and has a bell shape or a cup shape. The lens 200d has a recess 60 (an example of an opening recess) that opens the optical axis 10 portion of the exit surface 50b (an example of an exit part).

As shown in FIG. 14, the incident portion 201 of the lens 200d has a surface shape of a rotating body with the optical axis 10 as the center of rotation, as in the first embodiment. Further, the incident portion 201 of the lens 200d is a concave portion in which the top of the lens 200d is recessed.
However, the first incident surface 20 d is a plane that is orthogonal to the optical axis 10, is substantially parallel to the LED 15 a (the ceramic package 1), and is a circular surface centering on a point that intersects the optical axis 10.
Similarly to the first embodiment, the size of the first incident surface 20d is a size that fits inside the auxiliary line E, and obstructs the light incident from the second incident surface 30 and totally reflected by the reflecting surface 40. It is a size that does not.

As shown in FIG. 14, the exit surface 50b of the lens 200d has a recess 60 in the optical axis 10 portion.
The shape of the recess 60 has a shape of a rotating body such as a cylinder or a truncated cone with the optical axis 10 as the center of rotation.
The bottom of the concave portion 60 has a convex portion that forms a rotating body with the optical axis 10 as the center of rotation.
The convex portion at the bottom of the concave portion 60 has a mountain shape whose cross-sectional shape is symmetric about the optical axis 10.
The convex portion at the bottom of the concave portion 60 has a first inclined surface 61d, a second inclined surface 62d, and a vertex 63d where the first inclined surface 61d and the second inclined surface 62d intersect, and is composed of a first inclined surface 61d and a second inclined surface 62d. The vertex angle (angle of the vertex 63d portion) is about 90 degrees.
The first slope 61d and the second slope 62d are prism surfaces that totally reflect incident light. The light incident on the first inclined surface 61d from the LED 15a via the first incident surface 20d is totally reflected from the first inclined surface 61d to the second inclined surface 62d and is totally reflected from the second inclined surface 62d to the LED 15a via the first incident surface 20d. reflect. The light incident on the second inclined surface 62d from the LED 15a via the first incident surface 20d is totally reflected from the second inclined surface 62d to the first inclined surface 61d, and from the first inclined surface 61d via the first incident surface 20d. Total reflection.
Hereinafter, the convex portion at the bottom of the concave portion 60 is referred to as a total reflection prism portion 64d.

That is, the emission surface 50b has a flat surface substantially parallel to the LED 15a, and has a concave portion 60 in the center (or a truncated cone shape whose diameter decreases as the distance from the emission surface 50b).
On the bottom surface of the recess 60, there is provided a total reflection prism portion 64d that is symmetrical with respect to the optical axis 10 and has a vertex 63d farthest from the LED element 2a at a position away from the optical axis 10. The three-dimensional shape of the total reflection prism portion 64d is a shape obtained by rotating the cross-sectional shape shown in FIG. 14 around the optical axis 10 as a rotation axis.
The total reflection prism portion 64d will be described with respect to the right half of FIG. 14. The first inclined surface 61d extending obliquely upward to the left with a 45 degree inclination from the position farthest from the optical axis 10, and the optical axis 10 and the recess 60 The second slope 62d extends obliquely upward to the right with an inclination of 45 degrees from the intersection with the bottom, and the intersection of the first slope 61d and the second slope 62d is a vertex 63d. That is, the cross-sectional shape of the total reflection prism portion 64d is a right isosceles triangle. A shape obtained by rotating this cross-sectional shape around the optical axis 10 as a rotation axis is a three-dimensional shape of the total reflection prism portion 64d.

FIG. 15 is a partially enlarged cross-sectional view of the light source device 100d according to Embodiment 4, and shows an enlarged portion where the total reflection prism portion 64d of FIG. 14 is located. Further, the hatched lines indicating the cross-sectional view are omitted.
The action of the lens 200d on the light emitted from the LED 15a will be described below with reference to FIG.

  The strong yellowish white light (not shown) that is emitted from the point I near the side of the LED 15a and is incident on the second incident surface 30 is refracted by the second incident surface 30 and the lens as in the first embodiment. It enters 200d, is totally reflected by the reflecting surface 40, and is emitted in a direction inclined with respect to the optical axis 10 from the emitting surface 50b.

On the other hand, the bluish white light 71 emitted from the point H of the LED 15a and incident on the first incident surface 20d is a plane on which the first incident surface 20d is substantially orthogonal to the optical axis 10, and therefore the first incident surface 20d. The light enters the lens 200d without being refracted. The white light 71 incident on the lens 200d from the first incident surface 20d reaches the second inclined surface 62d. The white light 71 that has reached the second inclined surface 62d from the first incident surface 20d is totally reflected in the direction substantially orthogonal to the optical axis 10 by the second inclined surface 62d. The white light 71 reflected by the second slope 62d reaches the first slope 61d. The white light 71 reaching the first slope 61d from the second slope 62d is totally reflected in the first slope 61d in a direction substantially parallel to the optical axis 10. The white light 71 reflected by the first inclined surface 61d is emitted from the lens 200d without being substantially refracted by the first incident surface 20d. The white light 71 emitted from the first incident surface 20d to the outside of the lens 200d reaches the point I of the LED 15a.
A part of the white light 71 reaching the point I of the LED 15a is reflected by the phosphor 3, the ceramic package 1, etc., is emitted from the point I again, enters the second incident surface 30, and the above-described strong yellowish white The light is emitted together with light in a direction inclined with respect to the optical axis 10 from the emission surface 50b.

  That is, the strong yellowish white light emitted from the point I of the LED 15a and the strong white light 71 emitted from the point H of the LED 15a are both inclined in the direction inclined with respect to the optical axis 10 from the emission surface 50b of the lens 200d. Exit.

  In addition, the bluish white light (not shown) that is emitted from the point H near the center of the LED 15a and is incident on the second incident surface 30 is not substantially refracted on the second incident surface 30 as in the first embodiment. The light enters the lens 200d, is totally reflected by the reflecting surface 40, and exits from the exit surface 50b in a direction substantially parallel to the optical axis 10.

On the other hand, the yellowish white light 70 emitted from the point I of the LED 15a and incident on the first incident surface 20d is incident on the lens 200d without being refracted by the first incident surface 20d in the same manner as the white light 71. The first inclined surface 61d is totally reflected in a direction substantially perpendicular to the optical axis 10, the second inclined surface 62d is totally reflected in a direction substantially parallel to the optical axis 10, and the first incident surface 20d is not substantially refracted and is a lens. The light exits from 200d and returns to the point H of the LED 15a.
A part of the white light 70 that has reached the point H of the LED 15a is emitted from the point H and incident on the second incident surface 30, and the direction substantially parallel to the optical axis 10 from the emission surface 50b together with the above-mentioned white light with strong bluishness. To exit.

  That is, both the bluish white light emitted from the point H of the LED 15a and the yellowish white light 70 emitted from the point I of the LED 15a are emitted in a direction substantially parallel to the optical axis 10 from the emission surface 50b of the lens 200d. To do.

Therefore, the strong white light emitted from the LED 15a and the strong white light emitted from the LED 15a overlap each other on the front surface of the lens 200a and the periphery thereof to cancel the blueness and yellowness.
Thereby, the irradiated surface is illuminated with high-quality white light with little color unevenness.

In the fourth embodiment, the following light source device 100d has been described.
The light source device 100d includes a light source (LED 15a) and a lens 200d.
The lens 200d includes at least an incident surface (incident unit 201) that captures light from the light source, a reflective surface 40 that reflects light from the incident surface, and an output surface 50b that emits light from the incident surface and the reflective surface 40. Have.
The concave portion 60 provided on the emission surface 50b has two or more convex shapes on the bottom surface, the cross-sectional shape of which is symmetrical with respect to the optical axis 10 of the light source, and the farthest away from the light source at a position away from the optical axis 10 of the light source As a total reflection prism portion 64d.
The total reflection prism portion 64d is a triangle whose cross-sectional shape is an apex angle of 90 degrees.
With this configuration, the light source device 100d allows the light reflected by the convex portion (total reflection prism portion 64d) to be emitted again after returning to the light source even when the light distribution from the light source is controlled by the lens 200d. Color separation at the light source can be relaxed, and uneven color on the irradiated surface can be reduced.

  The two convex portions of the cross-sectional shape of the total reflection prism portion 64d may be in contact with each other or separated from each other, like the convex portion of the first incident surface 20a in the first embodiment.

Embodiment 5 FIG.
A light source device in which the cross-sectional shape of the second inclined surface of the total reflection prism portion provided in the concave portion of the lens is an arc shape will be described.
Hereinafter, items different from the fourth embodiment will be mainly described. The same components as those in the fourth embodiment are denoted by the same reference numerals. The matters whose explanation is omitted are the same as in the fourth embodiment.

FIG. 16 is a cross-sectional view of the light source device 100f according to the fifth embodiment, and shows a cross section including the optical axis 10 of the LED 15a.
The second inclined surface 62f of the total reflection prism portion 64f has an arc shape in cross section, and forms a partial shape of a parabola J whose focal point is the center (or near the center) of the LED 15a in the cross section.

The second inclined surface 62f having an arcuate cross section can adjust the return position of light returning from the total reflection prism portion 64f to the LED 15a, and can increase the accuracy of the light return position. Hereinafter, the ability to adjust the return position of light is referred to as return light position controllability.
Since the light source device 100f collects the light reflected by the second inclined surface 62f at the first inclined surface 61f at the center (focus) of the LED 15a, the light source device 100f is a mixture of white light with strong blueness and white light with strong yellowishness in the LED 15a. The effect can be improved and color unevenness on the irradiated surface can be further reduced.

The cross-sectional shape of the first slope 61f may be an arc shape like the second slope 62f.
By making the cross-sectional shape of the first inclined surface 61f a part of a parabola whose focal point is an arbitrary position away from the center of the LED 15a, the light reflected by the second inclined surface 62f is changed to an arbitrary position of the LED 15a by the first inclined surface 61f. Can be condensed.
Thereby, the position controllability of the return light is further improved.

Embodiment 6 FIG.
A light source device in which an LED has a plurality of LED elements as in the third embodiment, and a concave portion 60 is provided on the exit surface 50b of the lens as in the fourth embodiment will be described.
Hereinafter, items different from the first, third, and fourth embodiments will be mainly described. The same components as those in the first, third, or fourth embodiment are denoted by the same reference numerals. Matters whose description is omitted are the same as in the first, third, or fourth embodiment.

FIG. 17 is an external view of a light source device 100e according to the sixth embodiment.
FIG. 18 is a cross-sectional view of light source device 100e and a plan view of lens 200e in the sixth embodiment.
18A shows the shape of the light source device 100e having a cross section including the optical axis 10 of the LED 15b, and FIG. 18B shows the recess 60 of the emission surface 50b from the direction of the optical axis 10.
The light source device 100e according to the sixth embodiment will be described below with reference to FIGS.

  In the light source device 100e, as in the third embodiment, the LEDs 15b are arranged in parallel with the xy plane, and three LED elements 2b are arranged in the x-axis direction and two in the y-axis direction. The z-axis direction is a direction parallel to the optical axis 10.

In the recess 60 provided on the exit surface 50b of the lens 200e in the sixth embodiment, the shape of the total reflection prism portion 64e located at the bottom is not rotationally symmetric about the optical axis 10, but is centered on the optical axis 10. It is line symmetric.
The shape of the yz section of the total reflection prism portion 64e shown in FIG. 17 is the same as that of the fourth embodiment (see FIG. 14).
The total reflection prism portion 64e is a shape obtained by extending the shape of the yz cross section shown in FIG. 18 in the x-axis direction, and has two convex portions extending in the x-axis direction.

As in the fourth embodiment, the light source device 100e emits strong blue light and strong yellow light to the front surface of the lens 200e and the periphery thereof to reduce color unevenness in the y-axis direction of the irradiation surface.
Further, in the light source device 100e, as in the third embodiment, the color unevenness of the light emitted from the LED 15b is small in the x-axis direction, so that the color unevenness in the x-axis direction of the irradiation surface is small.
Therefore, the light source device 100e can reduce color unevenness of the irradiation surface parallel to the xy plane.

Hereinafter, the above-described operation and effect will be described in detail.
The light emitted from the vicinity of the center of the LED 15b and reaching the second incident surface 30 and the light emitted from a position away from the center of the LED 15b and reached the second incident surface 30 are as described in the fourth embodiment. Then, the light is reflected by the reflection surface 40 and is emitted from the emission surface 50 b in a direction parallel to the optical axis 10 and a direction inclined from the optical axis 10.
The light emitted from the LED 15b in a direction substantially parallel to the optical axis 10 and reaching the first incident surface 20d is not affected by refraction because the first incident surface 20d is a plane substantially orthogonal to the optical axis 10. The light enters the lens 200e. The light incident from the first incident surface 20d enters the concave portion 60 provided on the output surface 50b.
The strong yellowish white light emitted from a position away from the center of the LED 15b and reaching the total reflection prism portion 64e of the concave portion 60 is totally reflected by the first inclined surface 61e, and the traveling direction is changed to the y-axis direction. 62e is reached. The light that has reached the second slope 62e is totally reflected, changes its traveling direction in a direction parallel to the z axis, and returns to the vicinity of the center of the LED 15b (a region of white light with strong bluishness). The light that has returned to the LED 15b is reflected by the phosphor 3, the ceramic package 1, and the like, and is emitted from the emission surface 50b through the second incident surface 30 of the lens 200e together with the bluish white light.
On the other hand, the bluish white light emitted from the vicinity of the center of the LED 15b and reaching the total reflection prism portion 64e of the recess 60 is totally reflected by the second inclined surface 62e, changes the traveling direction to the y-axis direction, and changes to the first inclined surface 61e. To reach. The light that has reached the first slope 61e is totally reflected, changes its traveling direction in a direction parallel to the z-axis, and returns to a position away from the center of the LED 15b (a region of strong yellowish white light). The light that has returned to the LED 15b is reflected by the phosphor 3, the ceramic package 1 and the like, and is emitted from the emission surface 50b through the second incident surface 30 of the lens 200e together with the strong yellowish white light.
As described above, the light emitted from the LED 15b and reaching the total reflection prism portion 64e of the lens 200e is returned to the LED 15b so that mainly yellowish light and blueish light are mixed in the LED 15b. The light is emitted from the LED 15b.
Thereby, the light source device 100e can extract high-quality light with little color unevenness, and can reduce the color unevenness of the irradiated surface. Further, since the light source device 100e includes the total reflection prism portion 64e extending in the axial direction with little color unevenness in the LED 15b, the LED 15b in which the plurality of LED elements 2b are arranged is used as a light source. Thus, when the color unevenness in the LED 15b is different between the x-axis and the y-axis, a remarkable effect is achieved.

  As in the fifth embodiment, the first inclined surface 61e and the second inclined surface 62e of the total reflection prism portion 64e may have an arc shape (parabolic shape).

  Further, the two convex portions of the total reflection prism portion 64e may be in contact with each other or separated from each other, like the convex portions of the first incident surface 20a in the first embodiment.

Embodiment 7 FIG.
Each of the above embodiments is merely an example of a light source device, and the light source device is not limited to each of the above embodiments. Various modifications, changes, additions, and the like can be made to the light source device by applying the above embodiments.
A light source device to which each of the above embodiments is applied will be described.
Hereinafter, items different from the above embodiments will be mainly described. The same components as those in the above embodiments are given the same reference numerals. Matters whose description is omitted are the same as those in the above embodiments.

FIG. 19 is a cross-sectional view of the light source device 100g and the light source device 100g ′ in the seventh embodiment, showing a cross section including the optical axis 10 of the LED 15a.
FIG. 19A shows a cross section of the light source device 100g, and FIG. 19B shows a cross section of the light source device 100g ′.
The light source device 100g and the light source device 100g ′ according to the seventh embodiment will be described below with reference to FIG.

The lens 200g of (a) and the lens 200g ′ of (b) have an entrance surface 30g at the top.
Similarly to the second incident surface 30 in the first embodiment, the incident surface 30g is a rotation surface having the optical axis 10 as a rotation axis, and is a part of a spherical surface centering on the LED element 2a.
The lens 200g does not have a surface at the top corresponding to the first incident surface 20a in the first embodiment.

Similarly to the fourth embodiment, the lens 200g of (a) has a recess 60 on the exit surface 50b and an exit surface projection 20g on the bottom of the recess 60.
The lens 200g ′ in (b) has an exit surface convex portion 20g on the exit surface 50b.

  The exit surface convex portion 20 g is obtained by inverting the first entrance surface 20 a in the first embodiment in the direction of the optical axis 10. Similarly to the first incident surface 20a in the first embodiment, the exit surface convex portion 20g is a rotation surface obtained by rotating an arc with the optical axis 10 as a rotation axis, and 2 arcs (convex portions) having a raised cross-sectional shape. It is the shape which arranged two.

Similarly to the first incident surface 20a in the first embodiment, the exit surface convex portion 20g is incident and refracted by the bluish light 25 emitted from the point J near the center of the LED 15a, and the light 25 travels in the traveling direction. The direction is changed with respect to the direction of the axis 10. The light 25 refracted by the exit surface convex portion 20 g is emitted in a direction away from the optical axis 10.
Similarly to the first incident surface 20a in the first embodiment, the exit surface convex portion 20g is incident and refracted by the strong yellowish light 26 emitted from the point K near the side of the LED 15a. The traveling direction is changed to a direction substantially parallel to the direction of the optical axis 10. The light refracted by the exit surface convex portion 20 g is emitted in a direction substantially parallel to the optical axis 10.
That is, the light emitted from the lens via the exit surface convex portion 20g becomes yellower as it is closer to the optical axis 10 as is the light emitted from the first entrance surface 20a via the first entrance surface 20a in the first embodiment. As the distance from the optical axis 10 increases, the bluish color increases.

Similarly to the first embodiment, the light emitted through the incident surface 30 g and the reflecting surface 40 becomes more blue as it gets closer to the optical axis 10 and becomes yellower as it gets farther from the optical axis 10.
Therefore, the light source device 100g in (a) and the light source device 100g ′ in (b) are similar to the light source device 100a in the first embodiment in that the light emitted from the lens via the output surface convex portion 20g and the incident surface 30g and Colors cancel each other out with the light emitted from the lens via the reflecting surface 40, and the unevenness of color on the irradiated surface is reduced.

  In the light source device 100g in (a) and the light source device 100g ′ in (b), as in the third embodiment, the LED has a plurality of LED elements, and the three-dimensional shape of the exit surface convex portion 20g is the convex surface of the cylindrical lens. It may be the same shape.

FIG. 20 is a cross-sectional view of the light source device 100h according to the seventh embodiment, and shows a cross section including the optical axis 10 of the LED 15a. Further, the hatched lines indicating the cross-sectional view are omitted.
The light source device 100h in the seventh embodiment will be described below with reference to FIG.

The lens 200h has a total reflection prism portion 64h on the exit surface 50c (an example of the exit portion), not on the concave portion.
The size of the total reflection prism portion 64 h is a size that does not interfere with the light incident from the second incident surface 30 and totally reflected by the reflection surface 40. If the total reflection prism portion 64h is reduced, the first incident surface 20d facing the total reflection prism portion 64h can be reduced. If the first incident surface 20d is small enough to be accommodated inside the auxiliary line E, the first incident surface 20d does not interfere with the light incident from the second incident surface 30 and totally reflected by the reflecting surface 40.
Moreover, in order to reduce the light absorption loss in the lens 200h, it is preferable that the distance between the total reflection prism portion 64h and the LED 15a is short.

  The shape of total reflection prism portion 64h may be a rotating body shape as in the fourth embodiment, or may be a shape obtained by extending the yz section in the x-axis direction as in the sixth embodiment. Absent.

Embodiment 8 FIG.
An illumination device including the light source device described in each of the above embodiments will be described. The same components as those in the above embodiments are given the same reference numerals.

FIG. 21 is a diagram illustrating the inside of the illumination device 300 according to the eighth embodiment.
Illumination device 300 according to Embodiment 8 will be described below based on FIG.

The lighting device 300 is a spotlight including a plurality of light source devices 100a described in the first embodiment.
The lighting device 300 includes a power supply device 320, a circuit board 330, and a plurality of light source devices 100a in a housing 310.
The plurality of light source devices 100a are mounted side by side on the circuit board 330, are supplied with power from the power supply device 320, and emit light emitted from the LEDs 15a from the lens 200a.

  Since the illumination device 300 includes the light source device 100a that reduces color unevenness on the irradiation surface, the illumination device 300 is a high-quality and bright spotlight.

FIG. 21 illustrates the lighting device 300 including the light source device 100a described in Embodiment 1, but the lighting device 300 may include the light source device described in other embodiments.
Moreover, the illuminating device 300 should just be provided with the light source device demonstrated in said each embodiment, and is not restricted to a spotlight.

1 is an external view of a light source device 100a in Embodiment 1. FIG. FIG. 3 shows an LED 15a in the first embodiment. Sectional drawing of the light source device 100a in Embodiment 1. FIG. FIG. 3 is a diagram illustrating the hue of light emitted from an LED 15a in the first embodiment. FIG. 6 shows a light emission direction from a lens 200a in the first embodiment. FIG. 6 shows light distribution control of the light source device 100a in the first embodiment. The figure which shows the color nonuniformity produced by the conventional light source device 100i. FIG. 6 is an external view of a light source device 100c in a second embodiment. FIG. 6 is an external view of a light source device 100b according to Embodiment 3. FIG. 6 shows an LED 15b in a third embodiment. FIG. 10 is a perspective view of a lens 200b according to Embodiment 3. Sectional drawing of the lens 200b in Embodiment 3. FIG. FIG. 14 is an external view of a light source device 100d in a fourth embodiment. Sectional drawing of the light source device 100d in Embodiment 4, and the top view of the lens 200d. FIG. 10 is a partial enlarged cross-sectional view of a light source device 100d in a fourth embodiment. Sectional drawing of the light source device 100f in Embodiment 5. FIG. FIG. 16 is an external view of a light source device 100e in a sixth embodiment. Sectional drawing of the light source device 100e in Embodiment 6, and the top view of the lens 200e. Sectional drawing of the light source device 100g and light source device 100g 'in Embodiment 7. FIG. Sectional drawing of the light source device 100h in Embodiment 7. FIG. FIG. 18 shows an inside of a lighting device 300 in Embodiment 8.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Ceramic package, 2a, 2b LED element, 3 fluorescent substance, 6 recessed part, 10 optical axis, 11 blue light, 12, 12a, 12b white light, 13A, 13B graph, 15a, 15b LED, 20a, 20b, 20c, 20d First entrance surface, 20 g exit surface convex portion, 21, 22, 23, 24, 25, 26 light, 30 Second entrance surface, 30 g entrance surface, 40 reflection surface, 50a, 50b, 50c exit surface, 51 collar, 60 recess, 61d, 61e, 61f first slope, 62d, 62e, 62f second slope, 63d, 63e, 63f vertex, 64d, 64e, 64f, 64h total reflection prism part, 70, 71 white light, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100g ′, 100h, 100i Light source device, 200a, 200 , 200c, 200d, 200e, 200f, 200g, 200g ', 200h, 200i lens, 201 incident portion, 300 illumination device, 310 a housing, 320 power supply apparatus, 330 a circuit board, 400 irradiation surface, 500 and 501 light.

Claims (12)

In a lens having an incident part for entering light from a light source,
The incident portion is
A first incident surface having convex portions at at least two points equal in distance from the lens axis;
A lens having a second incident surface surrounding the first incident surface.   2. The lens according to claim 1, wherein the convex portion of the first incident surface has an arc shape in a cross section including an axis of the lens.   The lens according to claim 1, wherein the incident portion has a rotating body shape with the axis of the lens as a center of rotation.   The lens according to claim 1, wherein a shape of a cross section including an axis of the lens is symmetric about the axis. The first incident surface refracts light from a point on the lens axis in a direction inclined from the lens axis and enters the lens, and receives light from a point away from the lens axis. The lens according to claim 1, wherein the lens is refracted in the axial direction of the lens and enters the lens. In a lens provided with an incident part for incident light from a light source, an emission part for emitting light incident on the incident part, and an opening recess opened at a part of the emission part,
The opening concave portion has a convex portion at the bottom at at least two points having the same distance from the axis of the lens.   The lens according to claim 6, wherein the convex portion of the opening concave portion has a cross-sectional shape including an axis of the lens having a mountain shape including an arc in an oblique portion.   The lens according to claim 6, wherein the opening recess has a rotating body shape with the axis of the lens as the center of rotation.   The lens according to any one of claims 6 to 7, wherein the opening recess has a cross-sectional shape including an axis of the lens symmetrical with respect to the axis. In a lens provided with an incident part for incident light from a light source and an emission part for emitting light incident on the incident part,
The lens, wherein the emitting part has convex parts at at least two points having the same distance from the axis of the lens.   The light source device provided with the light source and the lens in any one of Claims 1-10.   An illumination device comprising: the light source device according to claim 11; and a power supply device that supplies power to the light source device.