JP6914091B2 - Light source device and lighting device - Google Patents

Description

The present invention relates to a light source device including a lens that changes the traveling direction of light and a lighting device using the light source device.

Conventionally, a light source device using a light emitting element such as an LED (Light Emitting Diode) as a light source is known. The light source device controls the light distribution by radiating the light emitted from the light source in a predetermined direction by using an optical component such as a lens. Patent Document 1 discloses an LED lighting device including an optical lens having a holding unit, a refraction control unit, and a reflection control unit. In Patent Document 1, the holding portion is a member held by the base. The refraction control unit controls the light distribution by refraction of the light component within a predetermined angle range with respect to the optical axis with respect to the light from the reference point. The reflection control unit guides light components outside the range of a predetermined angle of the light from the reference point into the inside of the optical lens, and controls the light distribution by total reflection on the reflection surface. In Patent Document 1, a reflection control unit is provided on the outer periphery of the refraction control unit. Patent Document 2 discloses a light emitting device including a light flux control member having a flange portion, an exit surface, and an outer peripheral surface. In Patent Document 2, the flange portion is a member held by the holder. The exit surface controls the light distribution by refraction of light components within a predetermined angle range with respect to the optical axis with respect to the light from the reference point. The outer peripheral surface is formed so as to extend in the optical axis direction, and guides light components outside the range of a predetermined angle of the light from the reference point to the inside of the optical lens, and controls the light distribution by total reflection.

Japanese Unexamined Patent Publication No. 2010-272463 Japanese Unexamined Patent Publication No. 2012-150274

However, in the LED lighting device disclosed in Patent Document 1, there is light in which the light incident on the reflection control unit is incident on the holding unit without being incident on the reflection surface. The light incident on the holding portion is not radiated in a predetermined direction because the light distribution is not controlled. Therefore, the light utilization efficiency of the LED lighting device as a whole is lowered. Further, in the light emitting device disclosed in Patent Document 2, the size of the outer peripheral surface in the optical axis direction is increased in order to reflect the light emitted from the light source on the outer peripheral surface as much as possible to improve the light utilization efficiency. .. Therefore, the thickness of the lens becomes thick and the lens becomes large.

The present invention has been made against the background of the above problems, and provides a light source device for improving light utilization efficiency without enlarging the lens and a lighting device using the light source device.

The light source device according to the present invention is formed with a light source that emits light, an incident surface that is provided on the exit side of the light source and is incident with the light emitted from the light source, and an exit surface from which the light incident from the incident surface is emitted. The lens is provided with a lens that changes the traveling direction of the light, and the lens is formed so as to project from the emitting surface, and a refraction control unit that refracts the light emitted from the light source in the optical axis direction of the light source and a lens projecting from the incident surface. It has a reflection control unit that is formed and reflects the light emitted from the light source in a direction along the optical axis, and the distance from the refraction end portion of the refraction control unit to the optical axis is the reflection end portion of the reflection control unit. rather longer than the distance to the optical axis from the refractive controller has a refractive surface that refracts light emitted from the light source in the optical axis direction, the reflection control unit leaves the light emitted from the light source from the optical axis It has a first surface that is refracted in the direction and a second surface that is formed outside the first surface and reflects the light refracted by the first surface toward the refraction control unit side. A part of the light incident on the refraction control unit directly reaches the refraction control unit .

According to the present invention, the distance from the refraction end portion on the side away from the optical axis of the refraction control unit to the optical axis is longer than the distance from the reflection end portion on the side away from the optical axis in the reflection control unit to the optical axis. Therefore, the light incident on the reflection control unit surely reaches the refraction control unit. Therefore, it is possible to increase the amount of light for which light distribution control is performed without increasing the reflection control unit. In this way, it is possible to improve the light utilization efficiency without increasing the size of the lens.

It is an exploded perspective view which shows the light source apparatus 1 which concerns on Embodiment 1. FIG. It is a top view which shows the light source apparatus 1 which concerns on Embodiment 1. FIG. It is sectional drawing which shows the light source apparatus 1 which concerns on Embodiment 1. FIG. It is a graph which shows the light distribution distribution of the light source apparatus 1 which concerns on Embodiment 1. FIG. It is sectional drawing which shows the light source apparatus 100 which concerns on Embodiment 2. FIG. It is sectional drawing which shows the light source apparatus 200 which concerns on Embodiment 3. FIG. It is an exploded perspective view which shows the light source apparatus 300 which concerns on Embodiment 4. FIG. It is a top view which shows the light source apparatus 300 which concerns on Embodiment 4. FIG. It is sectional drawing which shows the light source apparatus 300 which concerns on Embodiment 4. FIG. It is a perspective view which shows the lighting apparatus 400 which concerns on Embodiment 5. It is sectional drawing which shows the lens 520 in the modification.

Embodiment 1.
Hereinafter, embodiments of the light source device and the lighting device according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing the light source device 1 according to the first embodiment, and FIG. 2 is a top view showing the light source device 1 according to the first embodiment. The light source device 1 will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the light source device 1 includes a housing 16, a light source 10, a substrate 11, a light source holder 15, a connector 13, a wire 12, and a lens 20.

FIG. 3 is a cross-sectional view showing the light source device 1 according to the first embodiment, and is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 3, the housing 16 is a bottomed cylindrical member, and contains a light source 10, a substrate 11, a light source holder 15, a lens 20, a connector 13, and a wire 12 inside. The light source 10 emits light, for example, irradiates white light, and has a structure in which a phosphor is coated on an LED chip. The light source 10 is provided with a phosphor that converts blue light into yellow light on an LED chip that emits blue light of, for example, about 440 nm to 480 nm. The light source 10 is a light emitting element that emits white light as synthetic light. The light source 10 is not limited to an LED, but may be an LD (Laser Diode) or the like, or may be a light emitting element having a large area of one light emitting surface.

The substrate 11 is, for example, a square plate-shaped ceramic substrate, which is attached to the bottom surface of the housing 16. Further, the light source 10 is mounted on the substrate 11. A circuit pattern for power supply is formed on the substrate 11, and in addition to the light source 10, elements such as diodes (not shown) are appropriately mounted. The substrate 11 may be a metal substrate using a metal such as iron or aluminum, or may be a substrate 11 using a glass epoxy or a paper phenol material. The substrate 11 using glass epoxy, paper phenolic material, or the like is cheaper than the metal substrate. The light source holder 15 is a cylindrical member, and the light source 10 is housed inside.

The light source holder 15 is mounted on the substrate 11, whereby the light source 10 is held in the housing 16. One end side of the inner wall of the light source holder 15 has a tapered shape whose diameter is enlarged toward the outside, and is an aperture 15a that guides the light emitted from the light source 10 toward the lens 20 side. The connector 13 is a member to which a power supply 410 (not shown) for supplying electric power for driving an element on the substrate 11 is connected. The wire 12 is a member that connects the connector 13 and the substrate 11. In this way, power is supplied to the substrate 11 from the power supply 410 via the wire 12 and the connector 13.

The lens 20 is, for example, a disk-shaped member, which is provided in front of the light source 10, that is, on the emitting side, and changes the traveling direction of the light emitted from the light source 10. The lens 20 is formed with an incident surface 24a and an exit surface 24b. The incident surface 24a is a surface on which the light emitted from the light source 10 is incident. The exit surface 24b is a surface on which light incident from the incident surface 24a is emitted. The lens 20 is made of a translucent material such as an acrylic resin or a polycarbonate resin, and is manufactured by, for example, an injection molding method. The lens 20 has, for example, a rotationally symmetric shape. The lens 20 has a holding unit 24, a refraction control unit 21, and a reflection control unit 22.

The holding portion 24 is, for example, a flat plate-shaped member, and has a substantially uniform thickness. The holding portion 24 is provided on the outside of the refraction control portion 21, and both ends thereof are fixed to the ends of the housing 16. As a result, the lens 20 is held in the housing 16. The lens 20 is positioned by fixing the holding portion 24 and the housing 16, and the optical axis 14 and the rotation axis of the lens 20 coincide with or substantially coincide with each other. Further, a light entering surface 25 is formed in the central portion of the incident surface 24a, and the light entering surface 25 is a substantially flat surface on which the light emitted from the light source 10 is incident. The light entry surface 25 refracts the light emitted from the light source 10 in the direction along the optical axis 14.

The refraction control unit 21 is a member formed on the exit surface 24b and having a refraction surface 21a that refracts the light emitted from the light source 10 in the direction along the optical axis 14. The refraction control unit 21 has a convex shape protruding in a direction away from the light source 10. Further, the refraction control unit 21 becomes thinner as the distance from the optical axis 14 of the light source 10 increases, that is, the refraction surface 21a has a curved surface shape.

The reflection control unit 22 is a member formed on the incident surface 24a and refracts the light emitted from the light source 10 in the direction along the optical axis 14. The reflection control unit 22 has a convex shape that protrudes in the direction approaching the light source 10. The reflection control unit 22 has a first surface 22a, an intermediate surface 22b, and a second surface 122c. The first surface 22a is a surface that is connected to the end of the light entry surface 25 and extends toward the light source 10 so as to be substantially vertical or slightly inclined in a direction away from the optical axis 14 as the distance from the light entry surface 25 increases. The first surface 22a refracts the light emitted from the light source 10 in a direction away from the optical axis 14.

The intermediate surface 22b is a surface connected to the outer end of the first surface 22a and extends substantially perpendicular to the optical axis 14, that is, substantially horizontally in the direction away from the optical axis 14. The second surface 22c is a surface that is connected to the outer end of the intermediate surface 22b and extends toward the refraction control unit 21 so as to be inclined away from the optical axis 14 as the distance from the intermediate surface 22b increases. The second surface 22c reflects the light refracted by the first surface 22a toward the refraction control unit 21.

Here, the radial lengths of the refraction control unit 21 and the reflection control unit 22 will be described. The distance Lr from the refraction end R on the side of the refraction control unit 21 away from the optical axis 14 to the optical axis 14 is from the distance Lq from the reflection end Q on the side away from the optical axis 14 in the reflection refraction unit to the optical axis 14. long. That is, the diameter of the refraction control unit 21 is longer than the diameter of the reflection control unit 22. Next, the positional relationship between the center P of the light source 10, the reflection end portion Q, and the refraction end portion R will be described. The refraction end portion R is provided at a position away from the optical axis 14 with respect to the extension line T connecting the center P and the reflection end portion Q.

Next, the light path of the light source device 1 according to the first embodiment will be described with reference to FIG. In FIG. 3, as light paths, a path of light S1 and L1 emitted from the center of the light source 10 and a path of light M1 emitted from an end portion of the light source 10 are illustrated.

First, the path of the light S1 having a large angle from the optical axis 14 will be described. As shown in FIG. 3, the light S1 is incident on the lens 20 from the first surface 22a of the reflection control unit 22. The light S1 incident on the first surface 22a is refracted in a direction away from the optical axis 14 and incident on the lens 20. The light S1 incident on the lens 20 reaches the second surface 122c of the reflection control unit 22, is totally reflected, and then reaches the refraction control unit 21. The light S1 that has reached the refraction control unit 21 is refracted on the refraction surface 21a and is emitted from the lens 20 at different angles in the direction along the optical axis 14.

Next, the path of the light L1 having a small angle from the optical axis 14 will be described. The light L1 is incident on the lens 20 from the light incoming surface 25. The light L1 incident on the light incoming surface 25 is refracted in the direction along the optical axis 14 and is incident on the lens 20. The light L1 incident on the lens 20 reaches the refraction control unit 21. The light L1 that has reached the refraction control unit 21 is refracted on the refraction surface 21a and emitted from the lens 20 at different angles in the direction along the optical axis 14.

Then, the path of the light M1 emitted from the end of the light source 10 will be described. The light M1 is incident on the lens 20 from the first surface 22a of the reflection control unit 22. The light M1 incident on the first surface 22a is refracted in a direction away from the optical axis 14 and incident on the lens 20. The light M1 incident on the lens 20 reaches the refraction control unit 21 without hitting the second surface 122c of the reflection control unit 22. The light M1 that has reached the refraction control unit 21 is refracted on the refraction surface 21a and emitted from the lens 20 at different angles in the direction along the optical axis 14.

FIG. 4 is a graph showing the light distribution distribution of the light source device 1 according to the first embodiment. Next, the light distribution obtained by the light source device 1 will be described. In FIG. 4, the light distribution of the light source device 1 of the first embodiment is shown by a solid line, and as a comparative example, the light distribution of the light source device 1 without the lens 20 of the first embodiment is shown by a broken line. In FIG. 4, the horizontal axis indicates the inclination angle from the optical axis 14, and the direction of the optical axis 14 is 0 degree. The vertical axis shows the relative luminous intensity when the luminous intensity at an angle of 0 degrees of the light source device 1 in the comparative example is 100. As shown in FIG. 4, the light distribution of the light source device 1 in the comparative example is in a state of almost complete diffusion. On the other hand, in the light distribution of the light source device 1 according to the first embodiment, the luminous intensity near an angle of 0 degrees increases, and the light is focused near an angle of 0 degrees.

According to the first embodiment, the distance from the refraction end portion R on the side of the refraction control unit 21 away from the optical axis 14 to the optical axis 14 is the reflection end portion Q on the side of the reflection control unit 22 on the side away from the optical axis 14. Is longer than the distance from to the optical axis 14. Therefore, the light incident on the reflection control unit 22 surely reaches the refraction control unit 21. In the conventional light source device, there is light in which the light incident on the reflection control unit is incident on the holding unit without being incident on the reflection surface. Since the light incident on the holding portion is not controlled in light distribution, it is not radiated in a predetermined direction, and the light utilization efficiency is lowered. Further, in the conventional light source device, the outer peripheral surface is enlarged in order to reflect the light emitted from the light source on the outer peripheral surface as much as possible to improve the light utilization efficiency. Therefore, the thickness of the lens becomes thick and the lens becomes large.

On the other hand, in the first embodiment, the light incident on the reflection control unit 22 surely reaches the refraction control unit 21. Since the distance Lr from the refraction end R to the optical axis 14 is longer than the distance Lq from the reflection end Q to the optical axis 14, the light incident on the reflection control unit 22 does not hit the second surface 122c. , Reliably reach the refraction control unit 21. In this way, the refraction control unit 21 can control the light distribution even if the light cannot be captured by the second surface 122c. Therefore, it is possible to increase the amount of light for which light distribution control is performed without increasing the reflection control unit 22. In this way, the light utilization efficiency can be improved without increasing the size of the lens 20.

Further, the refraction end portion R is provided at a position away from the optical axis 14 from the extension line T connecting the center P of the light source 10 and the reflection end portion Q. Therefore, the light passing through the reflection end portion Q, which is a position just past the second surface 122c after being incident on the reflection control unit 22, also reaches the refraction surface 21a of the refraction control unit 21. Therefore, it is possible to increase the amount of light for which light distribution control is performed without increasing the reflection control unit 22. As a result, the light source device 1 having high optical controllability can be obtained.

Further, the lens 20 has a rotationally symmetric shape. Therefore, the light emitted from the light source 10 can be uniformly irradiated to the irradiated surface in the circumferential direction. The arrangement of the light source 10, the outer shape of the lens 20, and the shape of the light source device 1 may be elliptical or polygonal.

Embodiment 2.
FIG. 5 is a cross-sectional view showing the light source device 100 according to the second embodiment. The second embodiment is different from the first embodiment in that the lens 120 has a recess 123. In the second embodiment, the parts common to the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the first embodiment will be mainly described.

As shown in FIG. 5, in the lens 120, the recess 123 is formed on the outer periphery of the reflection control unit 122. The recess 123 has a second surface 122c, a third surface 123a, and a fourth surface 123b of the reflection control unit 122. Unlike the first embodiment, the second surface 122c extends from the incident surface 24a toward the exit surface 24b. The third surface 123a is a surface connected to the end of the second surface 122c and extends substantially perpendicular to the optical axis 14, that is, substantially horizontally in the direction away from the optical axis 14. The fourth surface 123b is a surface connected to the end of the third surface 123a and extending substantially parallel to the optical axis 14 from the third surface 123a.

Next, the light path of the light source device 100 according to the second embodiment will be described with reference to FIG. In FIG. 5, as the light path, the path of the light S1 and L1 emitted from the center of the light source 10 and the path of the light M2 emitted from the end of the light source 10 are illustrated. Since the paths of the light S1 and the light L1 are the same as the paths of the light S1 and the light L1 of the first embodiment, the description thereof will be omitted.

The path of the light M2 emitted from the end of the light source 10 will be described. The light M2 is incident on the lens 120 from the first surface 122a of the reflection control unit 122. The light M2 incident on the first surface 122a is refracted in a direction away from the optical axis 14 and incident on the lens 120. The light M2 incident on the lens 120 reaches the second surface 122c of the reflection control unit 122 extended to the recess 123 side, and after total internal reflection, reaches the refraction control unit 121. The light S1 that has reached the refraction control unit 121 is refracted on the refraction surface 121a and emitted from the lens 120 at different angles in the direction along the optical axis 14.

According to the second embodiment, since the lens 120 has the recess 123, the area of the second surface 122c of the reflection control unit 122 can be increased. Therefore, the amount of light controlled by the reflection control unit 122 increases. In this way, the diameter of the refraction control unit 121 can be reduced while maintaining the amount of light whose light distribution is controlled. As a result, the lens 120 having high light controllability for emitting light in a predetermined direction can be miniaturized. Further, the diameter of the refraction control unit 121 is larger than the diameter of the recess 123. Therefore, in forming the recess 123, the thickness of the refraction control unit 121 and the fourth surface 123b of the recess 123 is large. Therefore, during injection molding, the resin easily flows between the refraction control unit 121 and the fourth surface 123b. Therefore, the lens 120 can be easily manufactured.

Embodiment 3.
FIG. 6 is a cross-sectional view showing the light source device 200 according to the third embodiment. The third embodiment is different from the first embodiment in that the lens 220 is a Fresnel lens. In the third embodiment, the parts common to the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the first embodiment will be mainly described.

As shown in FIG. 6, the light entering surface 225 has a convex shape in which the thickness becomes thinner as the distance from the optical axis 14 increases. The refraction control unit 221 has a first refraction surface 221a, a connection surface 221b, and a second refraction surface 221c. The first refraction surface 221a is a portion of the refraction control unit 221 whose thickness becomes thinner as the distance from the light source 10 increases, and is a surface having a curved surface shape. The first refracting surface 221a refracts the light emitted from the light source 10 in the direction along the optical axis 14. The connection surface 221b is a surface that is connected to the end of the first refraction surface 221a and extends toward the refraction control unit 221 substantially parallel to the optical axis 14. The second refracting surface 221c is a surface that is connected to the end of the connecting surface 221b and has a curved surface shape that is curved in a direction in which the thickness becomes thinner as the distance from the light source 10 increases. The second refracting surface 221c refracts the light emitted from the light source 10 in the direction along the optical axis 14.

The reflection control unit 222 has a first inner surface 222a, a second inner surface 222b, a first outer surface 222c, and a second outer surface 222d. The first inner side surface 222a is a surface that is connected to the end portion of the light entering surface 25 and extends toward the light source 10 so as to be substantially vertical or slightly inclined in a direction away from the optical axis 14 as the distance from the light entering surface 225 increases. The first inner surface 222a refracts the light emitted from the light source 10 in a direction away from the optical axis 14. The second inner side surface 222b is a surface that is connected to the end of the first inner side surface 222a and extends toward the refraction control unit 221 so as to be inclined away from the optical axis 14 as the distance from the first inner side surface 222a increases. The second inner surface 222b reflects the light refracted by the first inner surface 222a toward the refraction control unit 221.

The first outer surface 222c is a surface that is connected to the end of the second inner surface 222b and extends toward the light source 10 so as to be substantially vertical or slightly inclined in a direction away from the optical axis 14 as the distance from the light entry surface 225 increases. The first outer surface 222c refracts the light emitted from the light source 10 in a direction away from the optical axis 14. The second outer surface 222d is a surface that is connected to the end of the first outer surface 222c and extends toward the refraction control unit 221 so as to be inclined away from the optical axis 14 as the distance from the first outer surface 222c increases. The second outer surface 222d reflects the light refracted by the first outer surface 222c toward the refraction control unit 221.

Also in the third embodiment, the distance Lr from the refraction end portion R on the side of the refraction control unit 221 away from the optical axis 14 to the optical axis 14 is the reflection end on the side of the reflection control unit 222 on the side away from the optical axis 14. The distance from the part Q to the optical axis 14 is longer than the distance Lq. That is, the diameter of the refraction control unit 221 is longer than the diameter of the reflection control unit 222.

Next, the light path of the light source device 200 according to the third embodiment will be described with reference to FIG. In FIG. 6, the paths of the lights S1, L1, M1 and M2 emitted from the center of the light source 10 are illustrated as the paths of the light.

First, the path of the light S1 having a large angle from the optical axis 14 will be described. As shown in FIG. 6, the light S1 is incident on the lens 220 from the first outer surface 222c of the reflection control unit 222. The light S1 incident on the first outer surface 222c is refracted in a direction away from the optical axis 14 and incident on the lens 220. The light S1 incident on the lens 220 reaches the second outer surface 222d of the reflection control unit 222, is totally reflected, and then reaches the refraction control unit 221. The light S1 that has reached the refraction control unit 221 is refracted at the second refraction surface 221c and is emitted from the lens 220 at different angles in the direction along the optical axis 14.

Next, the path of the light L1 having a small angle from the optical axis 14 will be described. The light L1 is incident on the lens 220 from the light incoming surface 225. The light L1 incident on the light incoming surface 225 is refracted in the direction along the optical axis 14 and is incident on the lens 220. The light L1 incident on the lens 220 reaches the refraction control unit 221. The light L1 that has reached the refraction control unit 221 is refracted by the first refraction surface 221a and is emitted from the lens 220 at different angles in the direction along the optical axis 14.

Then, the path of the light M1 whose angle from the optical axis 14 is intermediate between the light S1 and the light L1 will be described. The light M1 is incident on the lens 220 from the first outer surface 222c of the reflection control unit 222. The light M1 incident on the first outer surface 222c is refracted in a direction away from the optical axis 14 and incident on the lens 220. The light M1 incident on the lens 220 reaches the refraction control unit 221 without hitting the second outer surface 222d of the reflection control unit 222. The light M1 that has reached the refraction control unit 221 is refracted at the second refraction surface 221c and is emitted from the lens 220 at different angles in the direction along the optical axis 14.

Further, the path of the light M2 whose angle from the optical axis 14 is intermediate between the light M1 and the light L1 will be described. The light M2 is incident on the lens 220 from the first inner side surface 222a of the reflection control unit 222. The light M2 incident on the first inner side surface 222a is refracted in a direction away from the optical axis 14 and incident on the lens 220. The light M2 incident on the lens 220 reaches the second inner side surface 222b of the reflection control unit 222, is totally reflected, and then reaches the refraction control unit 221. The light S1 that has reached the refraction control unit 221 is refracted at the second refraction surface 221c and is emitted from the lens 220 at different angles in the direction along the optical axis 14.

According to the third embodiment, the lens 220 is a Fresnel lens, the refraction control unit 221 has a plurality of refraction surfaces, and the reflection control unit 222 has a plurality of first surfaces and a plurality of second surfaces. Has a face. Therefore, even if the thickness of the lens 220 is reduced, it is possible to control the light having a large angle from the optical axis 14 to be guided in a predetermined direction. That is, the third embodiment can realize the lens 220 which is thin and has high light controllability.

Embodiment 4.
FIG. 7 is an exploded perspective view showing the light source device 300 according to the fourth embodiment, and FIG. 8 is a top view showing the light source device 300 according to the fourth embodiment. The fourth embodiment is different from the first and second embodiments in that it is a linear light source device 300. In the fourth embodiment, the parts common to the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted, and the differences from the first and second embodiments will be mainly described.

As shown in FIGS. 7 and 8, the housing 316 is a rectangular parallelepiped member having a hollow portion 316a and extending in one direction. In the hollow portion 316a, a plurality of light sources 310, a substrate 311, a lens 320, a connector 13 and The wire 12 is housed. The plurality of light sources 310 emit light, and are mounted linearly in two rows on the substrate 311.

FIG. 9 is a cross-sectional view showing the light source device 300 according to the fourth embodiment, and is a cross-sectional view taken along the line BB of FIG. As shown in FIG. 9, the cross-sectional shape of the lens 320 is the same as the cross-sectional shape of the lens 320 of the second embodiment, but in the fourth embodiment, the lens 320 is not rotationally symmetric and the length of the housing 316 is long. It extends in the direction. Further, the intermediate surface 122b of the second embodiment is omitted. The light incoming surface 325 is provided with a diffusing portion 325a for diffusing light. The diffusion portion 325a is formed by, for example, performing a diffusion treatment by embossing. As a result, it is possible to eliminate the uneven brightness caused by the light sources 310 arranged discretely. The lens 320 is positioned by fixing the holding portion 324 and the housing 316.

According to the fourth embodiment, it is possible to realize a compact linear light source device 300 with improved light distribution controllability in one plane. Further, a diffusing portion 325a for diffusing light is provided on the surface of the lens 320. Thereby, the brightness unevenness caused by the light sources 310 arranged discretely can be eliminated, and the brightness unevenness and the color unevenness of the irradiation surface can be alleviated.

Embodiment 5.
FIG. 10 is a perspective view showing the lighting device 400 according to the fifth embodiment. The lighting device 400 according to the fifth embodiment is a device in which the light source device 1 according to the first embodiment is applied to a downlight.

As shown in FIG. 10, the lighting device 400 includes a light source device 1, a heat sink 430, a frame 420, a power supply 410, and a cable 440. The heat sink 430 is provided integrally with the housing 16 of the light source device 1, and has a function of discharging heat generated from the light source 10. The heat sink 430 and the housing 16 are made of, for example, aluminum. The frame 420 is a tubular member attached to the housing 16 on the exit surface side of the lens 20, and is made of resin, for example. The power supply 410 is a device that supplies a predetermined electric power to the light source device 1. The cable 440 is a member that connects the power supply 410 and the connector 13 (see FIG. 1).

The lighting device 400 according to the fifth embodiment includes the light source device 1 according to the first embodiment. Since the light source device 1 according to the first embodiment is small and highly efficient, it is possible to realize a compact lighting device 400 that illuminates the irradiation range brighter. Further, since the light emitted from the light source 10 is collected by the lens 20 of the light source device 1, the amount of light that hits the frame 420 is small. Therefore, the brightness of the frame 420 can be reduced. As a result, glare such as a glare phenomenon that may occur in the lighting device 400 can be reduced.

The lighting device 400 is not limited to the light source device 1 according to the first embodiment, and the light source device according to the second to fourth embodiments may be used. Further, the lighting device 400 may be not only mounted on the ceiling or the like, but may be installed on a table, fixed to a wall, or used for other purposes such as a vehicle headlight. good. Further, a heat conductive material such as heat conductive grease or a heat conductive sheet may be interposed between the light source module composed of the light source 10 and the substrate 11 and the heat sink 430, or an adhesive material may be interposed. The use of the adhesive is appropriately determined based on the heat resistant temperature, life, strength, etc. of the light source 10 used, the circuit element, and the like.

(Modification example)
FIG. 11 is a cross-sectional view showing the lens 520 in the modified example. As shown in FIG. 11, the refraction control unit 521 of the lens 520 has an aspherical shape. That is, in the refraction control unit 521, the gradient of the position facing the reflection control unit 522 is gently formed. In the modified example, since the refraction control unit 521 has an aspherical shape, the light incident on the refraction control unit 521 via the first surface 522a of the reflection control unit 522 and the refraction control via the light incoming surface 525 It is possible to reduce the light distribution deviation from the light incident on the unit 521.

Further, each surface of the reflection control unit 522, such as the second surface 522c, may be appropriately set not only as a straight line but also as a curved line so as to have a desired light distribution according to the application and purpose.

1 light source device, 10 light sources, 11 boards, 12 wires, 13 connectors, 14 optical axes, 15 light source holders, 15a apertures, 16 housings, 20 lenses, 21 refraction control units, 21a refraction surfaces, 22 reflection control units, 22a th. 1 surface, 22b intermediate surface, 22c second surface, 24 holding part, 24a incident surface, 24b exit surface, 25 incoming surface, 100 light source device, 120 lens, 121 refraction control unit, 121a refraction surface, 122 reflection control Unit, 122a first surface, 122b intermediate surface, 122c second surface, 123 recess, 123a third surface, 123b fourth surface, 200 light source device, 220 lens, 221 refraction control unit, 221a first refraction Surface, 221b connection surface, 221c second refraction surface, 222 reflection control unit, 222a first inner surface, 222b second inner surface, 222c first outer surface, 222d second outer surface, 225 entrance surface , 300 light source device, 310 light source, 311 substrate, 316 housing, 316a hollow part, 320 lens, 321 refraction control unit, 321a refraction surface, 322 reflection control unit, 322a first surface, 322c second surface, 323 recess , 323a 3rd surface, 323b 4th surface, 324 holding part, 324a incident surface, 324b exit surface, 325 light receiving surface, 325a diffuser, 400 lighting device, 410 power supply, 420 frame, 430 heat sink, 440 cable, 520 lens, 521 refraction control unit, 521a refraction surface, 522 reflection control unit, 522a first surface, 522b intermediate surface, 522c second surface, 524 holding unit, 524a incident surface, 524b exit surface, 525 incoming surface.

Claims (10)

A light source that emits light and
A lens provided on the exit side of the light source to form an incident surface on which the light emitted from the light source is incident and an exit surface on which the light incident from the incident surface is emitted to change the traveling direction of the light. Prepare,
The lens is
A refraction control unit that is formed so as to project from the exit surface and refracts the light emitted from the light source in the optical axis direction of the light source.
It has a reflection control unit that is formed so as to project from the incident surface and reflects light emitted from the light source in a direction along the optical axis.
The distance from the refracting edge of the refractive controller to said optical axis, rather longer than the distance to the optical axis from the reflective end of the reflection control unit,
The refraction control unit
It has a refracting surface that refracts the light emitted from the light source in the optical axis direction.
The reflection control unit
A first surface that refracts the light emitted from the light source in a direction away from the optical axis, and
It has a second surface formed on the outside of the first surface and reflecting the light refracted by the first surface toward the refraction control unit side.
A light source device in which a part of the light incident on the first surface directly reaches the refraction control unit. The light source device according to claim 1, wherein the refraction end portion is provided at a position away from the optical axis from an extension line connecting the light source and the reflection end portion. The lens is
The light source device according to claim 1 or 2, further comprising a holding unit provided outside the refraction control unit. The lens is a Fresnel lens.
The refraction control unit has a plurality of the refraction surfaces.
The light source device according to any one of claims 1 to 3, wherein the reflection control unit has a plurality of the first surface and a plurality of the second surfaces. The second surface is
The light source device according to claim 3 or 4 , wherein the light source device extends from the entrance surface toward the exit surface side. The lens is
The light source device according to any one of claims 1 to 5 , which has a rotationally symmetric shape. A housing that houses the light source and the lens and extends in one direction is further provided.
The lens is
The light source device according to any one of claims 1 to 5 , which has a shape extending along the longitudinal direction of the housing. The refraction control unit
The light source device according to any one of claims 1 to 7 , which has an aspherical shape. On the surface of the lens
The light source device according to any one of claims 1 to 8 , wherein a diffusing portion for diffusing light is provided. A lighting device including the light source device according to any one of claims 1 to 9.

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