JP7300879B2 - Optical lens, light source device and illumination device - Google Patents

Description

The present invention relates to an optical lens that changes the traveling direction of light, and to a light source device and a lighting device provided with the optical lens.

Conventionally, a light source device is known that includes an optical lens that changes the traveling direction of light. Light source devices are used, for example, as lighting for offices, shops or vehicles. Further, conventionally, there has been known a light source device that uses a light emitting element (LED: Light Emitting Diode) as a light source and performs light distribution control so that the light from the light source is emitted in a predetermined direction by an optical component such as an optical lens. there is Patent Literature 1 discloses a light source device that controls light distribution by combining a refraction lens section that collects light components by refraction and a reflector section that collects light by guiding the light components into the interior of the optical lens and causing total reflection on the reflecting surface. It is The optical lens of Patent Document 1 has an input surface that receives light within a predetermined angle range out of light emitted from a light source, and a reflecting surface that changes the direction of the light incident from the input surface to the output surface side by total reflection. Each of the lenses is configured by combining a plurality of lenses. Each lens is arranged to receive at its input surface light emitted within a viewing angle different from the viewing angle of the other lens, and the optical lens as a whole attempts to reduce uncontrollable light. Further, in Japanese Patent Laid-Open No. 2002-200013, light distribution control is not possible by eliminating light existing between light reflected by the outer peripheral surface of one lens and light reflected by the outer peripheral surface of the other lens. A reducing optical lens is disclosed.

JP-A-5-281402 Japanese Patent Application Laid-Open No. 2018-81806

However, in the light source device disclosed in Patent Literature 1, part of the light that has entered the lens is emitted from the emission surface without being incident on the reflection surface of the reflector section. Thus, according to Patent Document 1, the amount of light that cannot be controlled in light distribution increases, and the light utilization efficiency cannot be improved. In addition, if an attempt is made to increase the amount of light whose light distribution can be controlled, the diameter of the lens becomes longer and the height of the lens increases, resulting in an increase in size. Furthermore, when a plurality of lenses are combined as in Patent Document 2, the width of the gap is narrow and constant in order to reduce the amount of light that enters the gap between the lenses and is not controlled in light distribution. For this reason, when a plurality of lenses are adhered using an adhesive, for example, the adhesive flows into the gap, and the outer peripheral surface of one lens no longer performs an optical function, resulting in a decrease in the light utilization efficiency of the optical lens. No improvement.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and provides an optical lens, a light source device, and a lighting device that improve the light utilization efficiency.

An optical lens according to the present invention has a first lens portion arranged on the output side of a light source, and a second lens portion arranged on the optical axis side of the first lens portion, and is configured so that the light emitted from the light source In the optical lens that changes the traveling direction, the first lens part is an inner surface of a light entrance hole penetrating along the optical axis, the light entrance inner surface into which the light from the light source is incident, and the light entrance inner surface. a first reflective surface that extends from the light source side of the light incident inner surface to the first output surface and reflects the light that has entered from the light incident inner surface to the irradiation side; a connecting surface extending from the irradiation side of the inner surface to the first output surface; a light entrance recess into which light from the light entrance recess is incident, a refracting exit surface for exiting the light that has entered the light entrance recess, a second exit surface extending outward from the refracting exit surface, and a second a second reflecting surface that extends toward the output surface side and reflects light incident from the inner side surface of the light incident recess toward the irradiation side, wherein the connecting surface of the first lens portion is the second reflecting surface of the second lens portion; and the gap between the connecting surface and the second reflecting surface is such that a part of the gap on the light source side is narrower than a part of the gap on the irradiation side, and the connecting surface is arranged on the light source side and a surface bent relative to and connected to the surface .

According to the invention, the gap between the connecting surface and the second reflecting surface is such that a part of the gap on the light source side is narrower than a part of the gap on the illumination side. Therefore, it is difficult for the light emitted from the light source to directly enter the gap. In addition, since the gap is wider on the irradiation side than on the light source side, it is possible to prevent the first lens section and the second lens section from coming into close contact with each other. Therefore, the optical lens does not lose its second reflecting surface, and sufficiently performs its optical function. Therefore, the optical lens can improve light utilization efficiency.

1 is an exploded perspective view showing a light source device according to Embodiment 1; FIG. 3 is a cross-sectional view showing the path of light in the light source device according to Embodiment 1; FIG. FIG. 8 is an exploded perspective view showing a light source device according to Embodiment 2; FIG. 10 is a cross-sectional view showing the path of light in the light source device according to Embodiment 2; FIG. 11 is an exploded perspective view showing a light source device according to Embodiment 3; FIG. 11 is a cross-sectional view showing the path of light in the light source device according to Embodiment 3; FIG. 12 is a perspective view showing a lighting device according to Embodiment 4;

Hereinafter, embodiments of an optical lens, a light source device, and a lighting device according to embodiments will be described with reference to the drawings. In addition, it is not limited to the embodiment described below. In addition, in the following drawings, including FIG. 1, the size relationship of each constituent member may differ from the actual one. In addition, in the following description, terms representing directions are used as appropriate for ease of understanding, but they are for the purpose of description and are not limited to these terms. Directional terms include, for example, "up", "down", "right", "left", "front" or "back".

Embodiment 1.
FIG. 1 is an exploded perspective view showing a light source device 1 according to Embodiment 1. FIG. As shown in FIG. 1, the light source device 1 includes a light source 10 that emits light and an optical lens 20 that changes the traveling direction of the light emitted from the light source 10 . The light source device 1 also includes a substrate 11, wires 12, a connector 13, a lens holder 15, and the like.

The light source 10 is composed of, for example, an LED or the like. An LED has a phosphor that converts the wavelength of blue light into yellow light on an LED chip that emits blue light of about 440 nm to 480 nm, and emits white light that is a combination of blue light and converted yellow light. It is a light-emitting element that emits light. The light source 10 is mounted on a substrate 11, and the substrate 11 is, for example, a plate-shaped aluminum substrate. A circuit pattern for power supply is formed on the substrate 11, and in addition to the LED used as the light source 10, elements such as diodes (not shown) are mounted. The substrate 11 is connected to a power source (not shown) via wires 12 and connectors 13 .

FIG. 2 is a cross-sectional view showing light paths of the light source device 1 according to the first embodiment. The optical lens 20 has, for example, a bell-shaped outer shape, and is arranged on the emission side from which the light source 10 emits light. The optical lens 20 is made of a transparent material such as acrylic resin, polycarbonate resin, or glass. As shown in FIG. 2, the light source 10 and the optical lens 20 are positioned by the lens holder 15, and arranged so that the optical axis 14 of the light source 10 and the optical axis 14 of the optical lens 20 are aligned or nearly aligned. In the first embodiment, it is assumed that the light source 10 and the optical lens 20 are arranged so that their optical axes 14 are aligned. In the drawing, the arrow y direction indicates a direction parallel to the optical axis 14, and the arrow x direction and arrow z direction indicate directions perpendicular to the optical axis 14. FIG. The positive direction of the arrow y direction is the irradiation side, the negative direction is the light source 10 side, and the direction away from the optical axis 14 in the arrow x direction is the outer peripheral side.

The optical lens 20 has a first lens portion 30 and a second lens portion 40 . The first lens portion 30 is arranged on the exit side of the light source 10 and has a light entrance inner surface 37, a first exit surface 34, a first reflection surface 33, a connection surface 35, and the like. Further, the first lens portion 30 is provided with a light entrance hole 31 penetrating along the optical axis 14 . The light entrance inner surface 37 is the inner surface of the light entrance hole 31 and has a first light entrance inner surface 32 and a second light entrance inner surface 36 . The first light incident inner surface 32 is arranged on the light source 10 side and is inclined so as to approach the optical axis 14 toward the irradiation side. That is, the first light incident inner surface 32 has a partial conical shape with the optical axis 14 as the axis of rotation and the diameter of which decreases with increasing distance from the light source 10 side. The second light incident inner surface 36 is connected to the irradiation side of the first light incident inner surface 32 and is inclined away from the optical axis 14 toward the irradiation side. That is, the second light incident inner surface 36 has a partial conical shape with the optical axis 14 as the axis of rotation and the diameter increases with increasing distance from the light source 10 side.

The first emission surface 34 is a plane substantially perpendicular to the optical axis 14 , and emits light that has entered the first lens section 30 from the light incident inner surface 37 to the outside of the first lens section 30 . The first reflecting surface 33 extends from the light source 10 side of the light incident inner surface 37 to the first emitting surface 34 and has a shape of a body of revolution with the optical axis 14 as a rotation axis. The first reflecting surface 33 reflects the light incident from the light incident inner surface 37 and guides the light toward the first emitting surface 34 . Specifically, the first reflecting surface 33 totally reflects the light incident from the light incident inner surface 37 and makes the light substantially parallel to the optical axis 14 . The connection surface 35 extends from the irradiation side of the light entrance inner surface 37 to the first emission surface 34 and has a shape of a body of revolution with the optical axis 14 as a rotation axis.

The second lens portion 40 is arranged on the optical axis 14 side of the first lens portion 30, and has a light entrance concave portion 41, a refractive exit surface 45, a second exit surface 46, a second reflecting surface 44, and the like. ing. The light entrance concave portion 41 has a concave shape that opens toward the light source 10 side, and is an incident surface of the second lens portion 40 on which the light emitted from the light source 10 and passed through the light entrance hole 31 is incident. The light entering concave portion 41 is composed of an inner side surface 42 forming a side surface and a concave lens portion 43 forming an upper surface.

The inner side surface 42 has a shape of a part of a cone whose rotation axis is the optical axis 14 of the light source 10 and whose diameter decreases with increasing distance from the light source 10 side. The concave lens portion 43 is part of a sphere centered on the center Po of the light source 10 . The refracting and emitting surface 45 has a rotating body shape with the optical axis 14 as a rotation axis and is convex toward the irradiation side. 40 is emitted to the outside. The second exit surface 46 extends outward from the refractive exit surface 45 .

The second reflecting surface 44 extends from the light source 10 side of the inner surface 42 toward the second emitting surface 46 side, and has a shape of a body of revolution with the optical axis 14 as a rotation axis. The second reflecting surface 44 reflects the light incident from the inner side surface 42 of the light incident recess 41 and guides the light toward the second emitting surface 46 . Specifically, the second reflecting surface 44 totally reflects the light incident from the inner surface 42 and makes the light approximately parallel to the optical axis 14 . That is, the second emission surface 46 is formed of a plane that is substantially perpendicular to the optical axis 14 , and emits the light that has entered the second lens section 40 from the second reflection surface 44 to the outside of the second lens section 40 . . The second lens portion 40 also has a support portion 47 extending outside the refractive emission surface 45 . The support portion 47 is arranged on the irradiation side of the first emission surface 34 of the first lens portion 30 , and allows the light from the first emission surface 34 to pass through and exit the optical lens 20 .

The first lens portion 30 and the second lens portion 40 are arranged and positioned such that the connection surface 35 and the second light incident inner surface 36 face the second reflecting surface 44 . Here, in the gap S between the connection surface 35 and the second reflecting surface 44, a part of the gap S on the light source 10 side is narrower than a part of the gap S on the irradiation side. Specifically, the width of the gap S generated between the connecting surface 35 and the second light incident inner surface 36 and the second reflecting surface 44 is equal to the width of the end of the connecting surface 35 on the light source 10 side and the second light incident inner surface 36 is narrowed at the intersection. It is unknown to which surface the light emitted from the light source 10 and directly incident between the connecting surface 35 and the second reflecting surface 44 will reach after that. Therefore, the light emitted from the light source 10 and directly incident between the connecting surface 35 and the second reflecting surface 44 cannot be controlled in light distribution. In the first embodiment, the gap S between the connecting surface 35 and the second reflecting surface 44 is narrower than the part of the gap S on the light source 10 side, so that the distance from the light source 10 It is difficult for the emitted light to directly enter between the connecting surface 35 and the second reflecting surface 44 . The width of the space S at the intersection is preferably as narrow as possible, and may be in contact with each other.

In addition, the first light incident inner surface 32 and the inner surface 42 of the light incident concave portion 41 each have a shape of a part of a cone having the optical axis 14 as a rotation axis as described above. are different from each other. Specifically, on the inner side surface 42 of the light entrance concave portion 41 , the inclination toward the optical axis 14 with distance from the light source 10 is formed to be greater than the inclination of the first light entrance inner surface 32 , and the second reflection surface 44 The amount of light controlled by is ensured.

The relative positions of the first lens portion 30 and the second lens portion 40 in the direction of the optical axis 14 (direction of the arrow y) are such that the surface of the support portion 47 on the side of the light source 10 is in contact with the irradiation side of the first emission surface 34. It is determined by The first emission surface 34 and the support portion 47 may be in contact with each other via an air layer, but in the first embodiment, a case where they are optically integrated by adhesion, welding, or the like will be described as an example. . Such an integrated structure can suppress interfacial reflection between the support portion 47 of the second lens portion 40 and the first emission surface 34 of the first lens portion 30, thereby reducing light loss. Further, as shown in FIG. 2 , the optical lens 20 may be configured to be supported by the lens holder 15 on the outer periphery of the support portion 47 .

FIG. 2 shows a plurality of paths of light emitted from the center Po of the light source 10 and passing through the light source device 1 . The paths of light emitted in directions with different angles from the reference line 16 will be described below, with the reference line 16 passing through the center Po perpendicular to the optical axis 14 (in the direction of the arrow x) as a line with an angle of 0 degree. The direction of the optical axis 14 (direction of arrow y) is 90 degrees from the reference line 16 .

First, the path of the small-angle light S1 with a small angle from the reference line 16 will be described. The small angle light S1 is controlled by the first lens section 30. FIG. The small-angle light S<b>1 reaches the light entrance inner surface 37 on the way through the light entrance hole 31 and enters the first lens portion 30 . At this time, the small-angle light S<b>1 incident on the first light incident inner surface 32 is refracted in a direction away from the optical axis 14 and enters the first lens section 30 . The small-angle light S1 incident on the first lens unit 30 reaches the first reflecting surface 33 and reaches the first exit surface 34 after being totally reflected. Since the irradiation side of the first emission surface 34 and the light source 10 side of the support portion 47 are optically integrated, the small-angle light S1 reaching the first emission surface 34 is not reflected or refracted. It reaches the support portion 47 and emerges from the support portion 47 at an angle substantially parallel to the optical axis 14 .

Next, the path of the medium-angle light M1 whose angle from the reference line 16 is medium will be described. The medium-angle light M1 is controlled by the second lens section 40 . The medium-angle light M1 enters the second lens section 40 from the inner side surface 42 of the light entrance concave portion 41 . At this time, the medium-angle light M<b>1 incident on the inner side surface 42 of the light entrance concave portion 41 is refracted in a direction away from the optical axis 14 and enters the second lens portion 40 . The medium-angle light M1 incident on the second lens unit 40 reaches the second reflecting surface 44, is totally reflected, and then exits the optical lens 20 from the second exit surface 46 at an angle substantially parallel to the optical axis 14. .

Next, the path of the large-angle light L1 with a large angle from the reference line 16 will be described. The large-angle light L1 enters the second lens portion 40 from the concave lens portion 43 of the light entrance concave portion 41 . At this time, the large-angle light L1 enters the second lens portion 40 that is refracted in the direction along the optical axis 14 by the concave lens portion 43 . The large-angle light L<b>1 incident on the second lens unit 40 is emitted to the outside of the optical lens 20 from the refractive emission surface 45 at an angle substantially parallel to the optical axis 14 .

Next, the path of the outer peripheral light R1 emitted from the point Px on the outer peripheral side of the center Po of the light source 10 and reaching the second light incident inner surface 36 will be described. The peripheral light R<b>1 reaches the second light incident inner surface 36 and enters the first lens section 30 . At this time, the outer peripheral light R1 is refracted on the second light incident inner surface 36 in a direction away from the optical axis 14 and enters the first lens section 30 . The peripheral light R1 incident on the first lens portion 30 reaches the first reflecting surface 33 and reaches the first exit surface 34 after being totally reflected by the first reflecting surface 33 . Here, since the irradiation side of the first emission surface 34 and the light source 10 side of the support portion 47 are optically integrated, the peripheral light R1 reaching the first emission surface 34 is reflected or refracted. reaches the support portion 47 without being received, and exits from the support portion 47 .

According to the first embodiment, the space S between the connection surface 35 and the second reflecting surface 44 is narrower at a portion of the space S on the light source 10 side than a portion of the space S on the irradiation side. Therefore, it is difficult for the light emitted from the light source 10 to enter the void S directly. In addition, since the gap S is wider on the irradiation side than on the light source 10 side, it is possible to prevent the first lens portion 30 and the second lens portion 40 from coming into close contact with each other. For this reason, the optical lens 20 does not lose the second reflecting surface 44 and sufficiently performs the optical function. Therefore, the optical lens 20 can improve light utilization efficiency.

Conventionally, there is a technique for reducing the amount of light that cannot be controlled by light distribution control by eliminating the light existing between the light reflected by the outer peripheral surface of one lens and the light reflected by the outer peripheral surface of the other lens. Are known. In such a lens in which a plurality of lenses are combined, the width of the gap S is narrow and constant in order to reduce light that enters the gap S between the lenses and is not controlled in light distribution. Therefore, when a plurality of lenses are bonded using an adhesive, for example, the adhesive flows into the gap S, and the outer peripheral surface of one of the lenses no longer performs an optical function. Doesn't improve efficiency.

In contrast, in Embodiment 1, the space S between the connecting surface 35 and the second reflecting surface 44 is narrower on the light source 10 side than on the irradiation side. That is, the gap S on the light source 10 side can be narrowed, and the gap S on the irradiation side can be widened. Therefore, the light emitted from the light source 10 can perform its optical function sufficiently without the second reflecting surface 44 disappearing, while making it difficult for the light emitted from the light source 10 to enter the space S directly.

Further, the light-incident inner surface 37 has a first light-incident inner surface 32 that is arranged on the light source 10 side and that is inclined so as to approach the optical axis 14 toward the irradiation side. The light incident inner surface 37 has a second light incident inner surface 36 connected to the irradiation side of the first light incident inner surface 32 and inclined away from the optical axis 14 toward the irradiation side. Accordingly, the first light incident inner surface 32 and the second light incident inner surface 36 refract the light emitted from the light source 10 and incident on the first lens portion 30 so as to approach the first reflecting surface 33 .

Conventionally, a technique is known in which the shape of the light incident inner surface 37 on which light enters the lens is a part of a spherical surface centered on the light source 10 . Further, conventionally, a technique is known in which the shape of the light incident inner surface 37 on which light enters the lens is a part of a cone whose rotation axis is the optical axis 14 of the light source 10 and whose diameter decreases as the distance from the light source 10 increases. ing. As described above, when the first lens portion 30 does not have the second light incident inner surface 36, the outer peripheral light R1 does not reach the first reflecting surface 33 even if it is refracted when entering the first lens portion 30. The light reaches the support portion 47 of the second lens portion 40 without any delay and is emitted. For this reason, the peripheral light R1 spreads outside the light source device 1 rather than on the front side.

In contrast, in Embodiment 1, since the first lens portion 30 has the second light incident inner side surface 36 , the second light incident inner side surface 36 causes the outer peripheral light R<b>1 to approach the first reflecting surface 33 . refract into As a result, the peripheral light R1 reaches the first emission surface 34 after being totally reflected by the first reflection surface 33 . Here, since the irradiation side of the first emission surface 34 and the light source 10 side of the support portion 47 are optically integrated, the peripheral light R1 reaching the first emission surface 34 is reflected or refracted. reaches the support portion 47 without being received, and exits from the support portion 47 . Therefore, the outer peripheral light R1 is emitted to the front side of the light source device 1 . Since the first lens portion 30 has the second light incident inner surface 36 in this manner, the distribution of the peripheral light R1 can be controlled. Therefore, it is possible to provide the highly efficient and compact light source device 1 .

The second lens portion 40 has a concave shape that opens toward the light source 10, and has a light entrance recess 41 into which light from the light source 10 that has passed through the light entrance hole 31 of the first lens portion 30 enters. and a refracting/emitting surface 45 for emitting light incident on the concave portion 41 . The second lens portion 40 includes a second exit surface 46 extending outward from the refracting exit surface 45 , and an inner surface 42 of the light entrance recess 41 extending from the light source 10 side to the second exit surface 46 . and a second reflecting surface 44 that reflects light incident from the inner surface 42 toward the irradiation side. Thereby, the inner side surface 42 of the light entrance concave portion 41 refracts the light incident on the optical lens 20 from the light source 10 so as to approach the second reflecting surface 44 . The direction of incident light is controlled by each reflecting surface.

In addition, the first light incident inner surface 32 and the inner surface 42 of the light incident recess 41 each have an inclination toward the optical axis 14 toward the irradiation side. It is larger than the inclination of the light incident inner surface 32 . Thereby, the inclination of the second reflecting surface 44 for obtaining reflected light substantially parallel to the optical axis 14 can be made smaller than the inclination of the first reflecting surface 33 . Therefore, the difference in diameter between the second reflecting surface 44 and the first reflecting surface 33 can be increased, and the light reflected by the first reflecting surface 33 can be prevented from being blocked by the connecting surface 35. The light utilization efficiency of the lens 20 can be enhanced.

The second lens portion 40 extends from the refracting/exiting surface 45 to the outer peripheral side, is disposed on the irradiation side of the first emitting surface 34, and has a supporting portion 47 optically adhered to the first emitting surface 34. is. As a result, when the first exit surface 34 of the first lens portion 30 and the second lens portion 40 are optically bonded together, the boundary air layer disappears, and reflection or refraction due to the air layer is suppressed. Therefore, the light utilization efficiency of the optical lens 20 is enhanced.

The light source device 1 also includes a light source 10 that emits light and an optical lens 20 . Thereby, it is possible to provide the highly efficient and compact light source device 1 .

Embodiment 2.
FIG. 3 is an exploded perspective view showing the light source device 100 according to Embodiment 2. FIG. FIG. 4 is a cross-sectional view showing light paths of the light source device 100 according to the second embodiment. A light source device 100 according to Embodiment 2 will be described with reference to FIGS. 3 and 4. FIG. Embodiment 2 differs from Embodiment 1 in the shape of first lens portion 130 of optical lens 120 . In the second embodiment, the same reference numerals are given to the parts that are common to the first embodiment, and the description thereof is omitted.

In Embodiment 2, the first lens portion 130 has a light entrance inner surface 137, a first exit surface 134, a first reflection surface 133, a connection surface 135, and the like. Also, the first lens portion 130 is provided with a light entrance hole 131 penetrating along the optical axis 14 . Each configuration of the first lens unit 130 is substantially the same as that of the first embodiment except for the connection surface 135 .

As shown in FIGS. 3 and 4, the connection surface 135 has a first connection surface 135a and a second connection surface 135b. The first connection surface 135 a is arranged on the light source 10 side, and a gap S is formed between the first connection surface 135 a and the second reflection surface 144 . The first connection surface 135a has a shape of a body of revolution that protrudes toward the outer circumference with the optical axis 14 as a rotation axis. The second connecting surface 135 b is connected to the irradiation side of the first connecting surface 135 a and contacts the second reflecting surface 144 . The second connection surface 135b has a shape of a body of revolution that protrudes toward the outer circumference with the optical axis 14 as the axis of rotation. Here, the curvature of the second connecting surface 135b is substantially the same as the curvature of the second reflecting surface 144. As shown in FIG. Therefore, the shape of the second connection surface 135b is a shape of a body of revolution obtained by translating the second reflecting surface 144 along the optical axis 14 toward the light source 10 side.

In Embodiment 2, the second lens portion 140 has a light entrance concave portion 141, a refractive exit surface 145, a second exit surface 146, a second reflecting surface 144, and the like. Each configuration of the second lens unit 140 is substantially the same as that of the first embodiment. The second reflecting surface 144 has a shape of a body of revolution that protrudes toward the outer circumference, with the optical axis 14 as the axis of rotation. A part of the second reflecting surface 144 is the contact surface 144a that contacts the second connecting surface 135b as described above.

FIG. 4 shows a plurality of paths of light emitted from the center Po of the light source 10 and passing through the light source device 100 . The paths of light emitted in directions with different angles from the reference line 16 will be described below, with the reference line 16 passing through the center Po perpendicular to the optical axis 14 (in the direction of the arrow x) as a line with an angle of 0 degrees. The direction of the optical axis 14 (direction of arrow y) is 90 degrees from the reference line 16 .

Here, the path of the small-angle light S1 with a small angle from the reference line 16 is the same as in the first embodiment. Also, the path of the medium-angle light M1 having a medium angle from the reference line 16 is the same as in the first embodiment. Furthermore, the path of the large-angle light L1 with a large angle from the reference line 16 is also the same as in the first embodiment. Furthermore, the path of the outer peripheral light R1 emitted from the point Px on the outer peripheral side of the center Po of the light source 10 and reaching the second light incident inner surface 136 is also the same as in the first embodiment.

The path of medium-angle light M2, which has a medium angle from the reference line 16 and has a slightly larger angle from the optical axis 14 than the medium-angle light M1, will be described. The medium-angle light M2 is controlled by the second lens unit 140. FIG. The medium-angle light M2 enters the second lens portion 140 from the inner side surface 142 of the light entrance concave portion 141 . At that time, the medium-angle light M<b>2 incident on the inner side surface 142 of the light entrance concave portion 141 is refracted in a direction away from the optical axis 14 and enters the second lens portion 140 . The medium-angle light M2 incident on the second lens portion 140 reaches the contact surface 144a of the second reflecting surface 144 and is totally reflected. The totally reflected medium-angle light M2 is emitted from the second emission surface 146 to the outside of the optical lens 120 at an angle substantially parallel to the optical axis 14 .

According to the second embodiment, the connection surface 135 is arranged on the light source 10 side, and the first connection surface 135a having the space S formed between the second reflection surface 144 and the illumination of the first connection surface 135a. a second connecting surface 135b connected to the side and contacting the second reflecting surface 144; For this reason, the adhesive that adheres between the first emission surface 134 and the support portion 147 on the light source 10 side is pushed into the gap between the first lens portion 130 and the second lens portion 140 by the second connection surface 135b. Inflow is suppressed. Therefore, even if there is a gap between the first emission surface 134 and the support portion 147 on the side of the light source 10, the adhesive is prevented from entering the gap.

The optical lens 120 is manufactured using an injection molding method, for example. Therefore, the thickness of the first lens portion 130 is not constant. Therefore, deformation may occur in the first emission surface 134 and a gap may be formed between the first emission surface 134 and the support portion 147 on the light source 10 side. Here, a gap is generated between the optical axis 14 side of the first emission surface 134 and the optical axis 14 side of the support portion 147, and the first lens portion 130 and the second lens portion 140 are bonded together by an adhesive or the like. A case where the gap is filled will be described. In this case, the adhesive may flow into the gap between the first lens portion 130 and the second lens portion 140 . Since the second embodiment has the second connecting surface 135b that contacts the second reflecting surface 144, the adhesive is prevented from flowing into the gap between the first lens portion 130 and the second lens portion 140. be able to.

Embodiment 3.
FIG. 5 is an exploded perspective view showing the light source device 200 according to Embodiment 3. FIG. FIG. 6 is a cross-sectional view showing light paths of the light source device 200 according to the third embodiment. A light source device 200 according to the third embodiment will be described with reference to FIGS. 5 and 6. FIG. Embodiment 3 differs from Embodiment 2 in that light source device 200 includes light distribution control plate 60 . In the third embodiment, the same reference numerals are given to the parts that are common to the first and second embodiments, and the description thereof is omitted.

As shown in FIGS. 5 and 6, a light distribution control plate 60 for controlling the direction of light emitted from the optical lens 120 is arranged on the irradiation side of the optical lens 120 . The optical lens 120 and the light distribution control plate 60 are positioned by the lens holder 15 . The light distribution control plate 60 is arranged on the irradiation side of the optical lens 120 and changes the traveling direction of the light emitted from the optical lens 120 .

The light distribution control plate 60 has a disk shape with an inner diameter substantially equal to the outer diameter of the first lens portion 130 . The light distribution control plate 60 is made of a transparent material such as acrylic resin, polycarbonate resin or glass. The light distribution control plate 60 has a plate incident surface 61 located on the light source 10 side, and a plate exit surface 62 that is the rear surface of the plate incident surface 61 and faces the plate incident surface 61 . The plate incident surface 61 is a surface substantially perpendicular to the optical axis 14 . The plate exit surface 62 is a surface substantially perpendicular to the optical axis 14 and is textured, for example.

FIG. 6 shows the path of small-angle light S1 emitted from the center Po of the light source 10 and passing through the light source device 200. As shown in FIG. The paths of light emitted in directions with different angles from the reference line 16 will be described below, with the reference line 16 passing through the center Po perpendicular to the optical axis 14 (in the direction of the arrow x) as a line with an angle of 0 degrees. The direction of the optical axis 14 (direction of arrow y) is 90 degrees from the reference line 16 . Here, for the small-angle light S1, the medium-angle lights M1 and M2, the large-angle light L1, and the peripheral light R1, paths from entering the optical lens 120 to exiting are the same as in the second embodiment. In the third embodiment, the small-angle light S1 whose light distribution is controlled by the first reflecting surface 133 is taken as an example, and the case where the small-angle light S1 passes through the light distribution plate will be described.

After being emitted from the optical lens 120 , the small-angle light S<b>1 enters from the plate incident surface 61 of the light distribution control plate 60 . The small-angle light S1 is emitted from the optical lens 120 at an angle substantially parallel to the optical axis 14 . Therefore, the small-angle light S1 is hardly refracted or reflected at the plate entrance surface 61 . The small-angle light S<b>1 incident on the light distribution control plate 60 is emitted from the plate emission surface 62 . At that time, the small-angle light S1 becomes diffused light S2 diffused at a desired angle on the plate exit surface 62 subjected to texturing.

According to Embodiment 3, the light source device 200 includes the light distribution control plate 60 arranged on the irradiation side of the optical lens 120 to change the traveling direction of the light emitted from the optical lens 120 . The light source device 200 can obtain desired light distribution characteristics by means of the light distribution control plate 60 . Therefore, the light source device 200 can increase the amount of light emitted to a desired range and efficiently irradiate the light.

In the third embodiment, the plate entrance surface 61 of the light distribution control plate 60 is a plane substantially perpendicular to the optical axis 14, and the plate exit surface 62 is a plane substantially perpendicular to the optical axis 14 and is textured. is applied. The light distribution control plate 60 is not limited to this, and may be composed of a plurality of prisms arranged in a ring shape or a lattice shape, or may be composed of a rough surface or the like on any surface. Also, the light distribution control plate 60 may be optically integrated with the optical lens 120, and the integration can reduce the reflection loss at the interface and improve the light utilization efficiency.

Embodiment 4.
FIG. 7 is a perspective view showing a lighting device 300 according to Embodiment 4. FIG. A lighting device 300 according to Embodiment 4 will be described with reference to FIG. A lighting device 300 according to the fourth embodiment uses the light source device 1 according to the first embodiment as a spotlight. In the fourth embodiment, the same reference numerals are given to the parts that are common to the first embodiment, and the description thereof is omitted.

As shown in FIG. 7, the illumination device 300 includes, in addition to the light source device 1, a housing 302 in which the light source device 1 is installed, a power source 301, and fixtures and the like for attachment to the ceiling. The power source 301 is connected to the light source device 1 via a cable 303 and supplies predetermined power to the light source device 1 . In order to improve the heat dissipation performance, the housing 302 may be provided with, for example, an aluminum die-cast heat sink or the like.

As the light source device of the illumination device 300, the light source device 100 according to the second embodiment or the light source device 200 according to the third embodiment may be applied. Moreover, lighting device 300 is not limited to one that is attached to the ceiling. For example, the illumination device 300 may be installed on a table, or attached to a wall via a fixture, or may be used in other places or applications such as vehicle headlights. good too.

As described above, in the fourth embodiment, the illumination device 300 includes the light source device 1, the housing 302 in which the light source device 1 is installed, and the power supply 301 that supplies power to the light source device 1. be. As described above, since the illumination device 300 includes the compact and highly efficient light source device 1, the illumination range can be brightly illuminated, and the compact illumination device 300 can be provided.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. Moreover, the above embodiments can be combined in multiple ways. For example, in the above embodiment, the light emitting element of the light source 10 is configured using an LED, but may be configured with an LD (Laser Diode) or the like, or may be configured with a single light emitting element having a large light emitting surface area. may have been The arrangement of the light sources 10 is not limited to the arrangement with the optical axis 14 of the optical lens 20 as the rotation axis, and a plurality of light sources 10 may be arranged in a rectangular or polygonal shape.

In addition, although an aluminum substrate is used as the substrate 11 of the light source device 1, a metal substrate such as iron, or a substrate made of less expensive glass epoxy resin, paper phenol material, or the like may be used. Further, the material of the heat sink provided in the housing 302 is not limited to the aluminum die-cast material, and may be metal such as iron, or high thermal conductive resin.

Further, in the light source device 1 , a thermally conductive material such as thermally conductive grease or a thermally conductive sheet or an adhesive may be interposed between the substrate 11 and the lens holder 15 . Whether or not to use these adhesives may be appropriately determined based on the heat resistance temperature, lifespan, strength, etc. of the LEDs and circuit elements to be used.

In addition, the surface and part of the surface of the optical lens 20 may be subjected to light diffusion treatment such as texturing, for example, in order to relax the irradiated image or reduce color unevenness on the irradiated surface.

1,100,200 light source device 10 light source 11 substrate 12 wire 13 connector 14 optical axis 15 lens holder 16 reference line 20,120 optical lens 30,130 first lens unit 31,131 input light hole 32,132 first light incident inner surface 33,133 first reflecting surface 34,134 first emitting surface 35,135 connecting surface 135a first connecting surface 125b second connecting surface 36,136 second light incident inner surface 37,137 light incident inner surface 40,140 second lens portion 41,141 light incident concave portion 42,142 inner surface 43,143 concave lens portion 44,144 second reflecting surface; 144a contact surface, 45, 145 refracting output surface, 46, 146 second output surface, 47, 147 support portion, 60 light distribution control plate, 61 plate entrance surface, 62 plate output surface, 300 lighting device, 301 power supply, 302 housing body, 303 cable.

Claims (7)

An optical lens that has a first lens portion arranged on an emission side of a light source and a second lens portion arranged on an optical axis side of the first lens portion, and that changes a traveling direction of light emitted from the light source. and
The first lens portion is
an inner surface of a light entrance hole penetrating along the optical axis, the light entrance inner surface into which light from the light source is incident;
a first exit surface for exiting the light incident on the light incident inner surface;
a first reflective surface extending from the light source side of the light incident inner surface to the first output surface and reflecting light incident from the light incident inner surface toward an irradiation side;
a connecting surface extending from the irradiation side of the light input inner surface to the first output surface;
The second lens portion is
a light entrance concave portion having a concave shape open to the light source side and into which light from the light source that has passed through the light entrance hole of the first lens portion is incident;
a refracting and emitting surface for emitting light incident on the light incident concave portion;
a second exit surface extending outwardly from the refractive exit surface;
a second reflecting surface extending from the light source side of the inner surface of the light incident recess toward the second emission surface side and reflecting light incident from the inner surface of the light incident recess toward the irradiation side;
the connecting surface of the first lens portion is arranged to face the second reflecting surface of the second lens portion;
a gap between the connection surface and the second reflecting surface, wherein a part of the gap on the light source side is narrower than a part of the gap on the irradiation side;
The connection surface has a surface arranged on the light source side and a surface bent with respect to the surface and connected to the surface.
optical lens. An optical lens that has a first lens portion arranged on an emission side of a light source and a second lens portion arranged on an optical axis side of the first lens portion, and that changes a traveling direction of light emitted from the light source. and
The first lens portion is
an inner surface of a light entrance hole penetrating along the optical axis, the light entrance inner surface into which light from the light source is incident;
a first exit surface for exiting the light incident on the light incident inner surface;
a first reflective surface extending from the light source side of the light incident inner surface to the first output surface and reflecting light incident from the light incident inner surface toward an irradiation side;
a connecting surface extending from the irradiation side of the light input inner surface to the first output surface;
The second lens portion is
a light entrance concave portion having a concave shape open to the light source side and into which light from the light source that has passed through the light entrance hole of the first lens portion is incident;
a refracting and emitting surface for emitting light incident on the light incident concave portion;
a second exit surface extending outwardly from the refractive exit surface;
a second reflecting surface extending from the light source side of the inner surface of the light incident recess toward the second emission surface side and reflecting light incident from the inner surface of the light incident recess toward the irradiation side;
the connecting surface of the first lens portion is arranged to face the second reflecting surface of the second lens portion;
A gap between the connecting surface and the second reflecting surface is such that a part of the gap on the light source side is narrower than a part of the gap on the irradiation side,
The light incident inner surface is
a first light-receiving inner surface disposed on the light source side and inclined so as to approach the optical axis toward the irradiation side;
a second light-incident inner surface connected to the irradiation side of the first light-incident inner surface and inclined away from the optical axis toward the irradiation side;
optical lens. An optical lens that has a first lens portion arranged on an emission side of a light source and a second lens portion arranged on an optical axis side of the first lens portion, and that changes a traveling direction of light emitted from the light source. and
The first lens portion is
an inner surface of a light entrance hole penetrating along the optical axis, the light entrance inner surface into which light from the light source is incident;
a first exit surface for exiting the light incident on the light incident inner surface;
a first reflective surface extending from the light source side of the light incident inner surface to the first output surface and reflecting light incident from the light incident inner surface toward an irradiation side;
a connecting surface extending from the irradiation side of the light input inner surface to the first output surface;
The second lens portion is
a light entrance concave portion having a concave shape open to the light source side and into which light from the light source that has passed through the light entrance hole of the first lens portion is incident;
a refracting and emitting surface for emitting light incident on the light incident concave portion;
a second exit surface extending outwardly from the refractive exit surface;
a second reflecting surface extending from the light source side of the inner surface of the light incident recess toward the second emission surface side and reflecting light incident from the inner surface of the light incident recess toward the irradiation side;
the connecting surface of the first lens portion is arranged to face the second reflecting surface of the second lens portion;
A gap between the connecting surface and the second reflecting surface is such that a part of the gap on the light source side is narrower than a part of the gap on the irradiation side,
The connecting surface is
a first connecting surface disposed on the light source side and formed with a gap between itself and the second reflecting surface;
a second connection surface connected to the irradiation side of the first connection surface and in contact with the second reflection surface;
optical lens. The second lens portion is
4. The support portion according to any one of claims 1 to 3, further comprising a supporting portion extending outward from the second emission surface, arranged on the irradiation side of the first emission surface, and optically adhered to the first emission surface. 1. The optical lens according to item 1. the light source that emits light;
an optical lens according to any one of claims 1 to 4;
A light source device. 6. The light source device according to claim 5, further comprising a light distribution control plate arranged on the irradiation side of the optical lens and changing a traveling direction of the light emitted from the optical lens. A light source device according to claim 5 or 6;
a housing in which the light source device is installed;
a power source that supplies power to the light source device;
A lighting device.

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