JP2018081806A - Optical lens, light source device and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical lens that improves light use efficiency of the lens without making the lens large-sized, a light source device and a luminaire.SOLUTION: An optical lens has a first lens part 30 and a second lens part 40. The first lens part has: a light-incidence inner side face 32 as an inner side face of a light-incidence hole 31 penetrating along an optical axis 14; a first emission surface 34 which emits light impinging on the light-incidence inner side face; a first reflection surface 33 which reflects light made incident from the light-incidence inner side face to an irradiation side; and a connection surface 35 which extends from the irradiation side of the light-incidence inner side face to the first emission surface. The second lens part has: a light-incidence concave part 41 that light having passed through the light-incidence hole impinges on; a second emission surface 45 which emits the light impinging on the light-incidence concave part; and a second reflection surface 44 which reflects light made incidence from an inner side face of the light-incidence concave part to the irradiation side. A connection surface of the first lens part is so arranged as to face the second reflection surface of the second lens part. The light-incidence side face and the inner side face of the light-incidence concave part reflect light so that a traveling direction of light made incident from a light source approaches the first reflection surface or second reflection surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical lens and a light source device and an illumination device including the optical lens, and is particularly suitable for illumination for offices, stores, or vehicles.

  In a conventional light source device, a light source element (LED; Light Emitting Diode) is used as a light source, and light distribution is controlled by an optical component such as a lens so that light from the light source is emitted in a predetermined direction. Yes. For example, there is a light source device that controls light distribution by combining a refraction lens unit that condenses light components by refraction and a reflector unit that condenses light by being guided into the lens and totally reflected by a reflection surface (see Patent Document 1). ). The optical lens disclosed in Patent Document 1 includes an input surface that receives light in a predetermined angular range among light emitted from a light source, and reflection that changes the direction of light incident from the input surface toward the output surface side by total reflection. A plurality of lenses having a surface are combined. Each lens is arranged to receive light emitted within a viewing angle different from the viewing angle of the other lens at its input surface, and is configured to reduce light that cannot be controlled as a whole optical lens.

Special table 2015-529849 gazette

  However, in the optical lens of Patent Document 1, the input surface of each lens is formed as a concave surface that forms a part of an estimated spherical surface centered on the light source, and the reflection surface of each lens is a reflection of an adjacent lens. It arrange | positions so that it may not overlap with a surface in an optical axis direction. For this reason, although the optical lens of patent document 1 can control the direction of the light which entered into the input surface of each lens, without being disturbed by the adjacent lens, there exists a subject that the size of the radial direction of an optical lens becomes large.

  The present invention has been made in order to solve the above-described problems, and performs light distribution control of light emitted from a light source, and is an optical lens, a light source device, and an illumination device that are small in size and have high light use efficiency. For the purpose of provision.

  The optical lens according to the present invention includes a first lens unit disposed on the light emission side of the light source and a second lens unit disposed on the optical axis side of the first lens unit, and is emitted from the light source. An optical lens that changes a traveling direction of light, wherein the first lens unit is an inner surface of a light incident hole penetrating along the optical axis, and a light incident inner surface on which light from the light source is incident; A first light exit surface for emitting light incident on the light incident inner surface, and extending from the light source side of the light incident inner surface to the first light exit surface, and reflects light incident from the light incident inner surface to the irradiation side. The first reflecting surface and a connecting surface extending from the irradiation side of the light incident inner surface to the first emitting surface, and the second lens portion has a concave shape opened to the light source side, A light incident concave portion in which light from the light source that has passed through the light incident hole of the first lens portion is incident, and incident on the light incident concave portion And a second reflection surface that extends from the light source side of the inner side surface of the light incident concave portion to the second light emitting surface and reflects light incident from the inner side surface of the light incident concave portion to the irradiation side. And the connection surface of the first lens unit is disposed to face the second reflection surface of the second lens unit, and the inner surface of the light incident inner surface and the inner surface of the light incident recess are The light is refracted so that the traveling direction of the light incident from the light source approaches the first reflecting surface or the second reflecting surface.

  According to the present invention, the light incident on the light incident inner surface of the first lens unit and the inner surface of the light incident recess of the second lens unit has a traveling direction due to refraction at the incident surface and reflection at the reflecting surface, respectively. Be controlled. The first lens portion and the second lens portion are arranged so that the connection surface and the second reflection surface face each other. As a result, the light utilization efficiency of the lens can be increased without increasing the size of the lens.

1 is an exploded perspective view showing a light source device according to Embodiment 1. FIG. 4 is a cross-sectional view showing a light path of the light source device according to Embodiment 1. FIG. It is a figure which shows the exit angle of a perfect diffuse light source, and the ratio of the light beam quantity. 6 is an exploded perspective view showing a light source device according to Embodiment 2. FIG. 6 is a cross-sectional view showing a light path of a light source device according to Embodiment 2. FIG. 5 is an exploded perspective view showing a light source device according to Embodiment 3. FIG. FIG. 6 is a cross-sectional view showing a light path of a light source device according to Embodiment 3. 10 is an exploded perspective view showing a light source device according to Embodiment 4. FIG. FIG. 6 is a cross-sectional view showing a light path of a light source device according to Embodiment 4. FIG. 10 is a perspective view showing a lighting device according to Embodiment 5.

  Hereinafter, embodiments of an optical lens, a light source device, and an illumination device according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

Embodiment 1 FIG.
1 is an exploded perspective view showing the light source device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view showing a light path of the light source device according to the first embodiment. Based on FIG. 1 and FIG. 2, the light source device 1 of Embodiment 1 is demonstrated. The light source device 1 includes a light source 10 that emits light and an optical lens 20 that changes a traveling direction of the light emitted from the light source 10. The light source device 1 also includes a substrate 11, a wire 12, a connector 13, a lens holder 15, and the like.

  The light source 10 is composed of, for example, an LED. The LED is provided with 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 composite light of the blue light and the converted yellow light. 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-like aluminum substrate. A circuit pattern for power supply is formed on the substrate 11, and an element such as a diode (not shown) is mounted in addition to the LED used as the light source 10. The substrate 11 is connected to a power source (not shown) via the wire 12 and the connector 13.

  The optical lens 20 has, for example, a bell-shaped outer shape, and is disposed 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 are arranged so that the optical axis of the light source 10 and the optical axis of the optical lens 20 match or substantially match. In the first embodiment, it is assumed that the light source 10 and the optical lens 20 are arranged so that their optical axes coincide. In the drawing, the arrow y direction indicates a direction parallel to the optical axis 14, and the arrow x direction and the arrow z direction indicate directions perpendicular to the optical axis 14. Further, the positive direction of the arrow y direction is the irradiation side and 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 includes a first lens unit 30 and a second lens unit 40. The first lens unit 30 is disposed on the emission side of the light source 10 and has a light incident inner side surface 32, a first emission surface 34, a first reflection surface 33, a connection surface 35, and the like. Further, the first lens unit 30 is provided with a light incident hole 31 penetrating along the optical axis 14. The light incident inner surface 32 is an inner surface of the light incident hole 31. The light incident inner side surface 32 has an optical axis 14 as a rotation axis, and has a part of a conical shape whose diameter decreases as the distance from the light source 10 side increases. The first emission surface 34 is a plane that is substantially perpendicular to the optical axis 14, and emits light that has entered the first lens unit 30 from the light incident inner surface 32 to the outside of the first lens unit 30. The first reflection surface 33 extends from the light source 10 side of the light incident inner side surface 32 to the first emission surface 34 and has a rotating body shape with the optical axis 14 as a rotation axis. The first reflecting surface 33 reflects the light incident from the light incident inner surface 32 and guides it toward the first emitting surface 34. Specifically, the first reflecting surface 33 totally reflects the light incident from the light incident inner side surface 32 to make the light substantially parallel to the optical axis 14. The connection surface 35 extends from the irradiation side of the light incident inner surface 32 to the first emission surface 34 and has a rotating body shape with the optical axis 14 as a rotation axis. In the first embodiment, for example, the light incident inner side surface 32 and the light incident inner side surface 32 and the angle α formed by most of the light emitted from the first lens unit 30 and the direction of the optical axis 14 are in the range of 0 ° to 10 °. The shape of the first reflecting surface 33 is determined.

  The second lens unit 40 is disposed on the optical axis 14 side of the first lens unit 30 and has a light incident recess 41, a second emission surface 45, a second reflection surface 44, and the like. The light incident concave portion 41 has a concave shape opened to the light source 10 side, and the light incident concave portion 41 is an incident surface of the second lens portion 40 on which light emitted from the light source 10 and passed through the light incident hole 31 is incident. It is. The light incident concave portion 41 includes an inner side surface 42 that forms a side surface and a convex lens portion 43 that forms an upper surface. The inner side surface 42 has a part of a conical shape whose diameter decreases with increasing distance from the light source 10 side with the optical axis 14 of the light source 10 as a rotation axis. The convex lens portion 43 has a rotating body shape convex toward the light source 10 with the optical axis 14 as a rotational axis. The second exit surface 45 is configured by a plane substantially perpendicular to the optical axis 14, and emits the light that has entered the second lens unit 40 from the light incident recess 41 to the outside of the second lens unit 40. The second reflection surface 44 extends from the inner surface 42 to the second emission surface 45 from the light source 10 side, and has a rotating body shape 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 it toward the second exit surface. Specifically, the second reflecting surface 44 totally reflects the light incident from the inner side surface 42, and the second lens unit 40 has a support portion 46 extending to the outer peripheral side of the second emitting surface 45. ing. The support unit 46 is disposed on the irradiation side of the first emission surface 34 of the first lens unit 30, and allows the light from the first emission surface 34 to pass through and be emitted out of the optical lens 20.

  The first lens unit 30 and the second lens unit 40 are arranged and positioned so that the connection surface 35 and the second reflection surface 44 face each other. As described above, each of the connection surface 35 and the second reflection surface 44 has a rotating body shape with the optical axis 14 as a rotation axis, but the second reflection surface 44 has substantially the same curvature as the connection surface 35. doing. That is, the shape of the second reflection surface 44 is a rotating body shape in which the connection surface 35 is translated along the optical axis 14 to the irradiation side. In a state where the first lens unit 30 and the second lens unit 40 are combined, an air layer is formed between the connection surface 35 and the second reflection surface 44. When the light from the light source 10 enters the optical lens 20, the light incident on the air layer cannot be controlled. Therefore, the width of the air layer is preferably as narrow as possible.

  Further, the light incident inner side surface 32 and the inner side surface 42 of the light incident concave portion 41 each have a partial conical shape with the optical axis 14 as a rotation axis as described above, but are inclined with respect to the optical axis 14. Are different in size. Specifically, on the inner side surface 42 of the light incident concave portion 41, the inclination closer to the optical axis 14 as the distance from the light source 10 is formed is larger than the inclination on the light incident inner side surface 32, and is controlled by the second reflecting surface 44. The amount of light that is emitted is ensured.

  The relative positions of the first lens unit 30 and the second lens unit 40 in the optical axis direction (arrow y direction) are such that the surface of the support unit 46 on the light source 10 side is in contact with the irradiation side of the first emission surface 34. Determined by. The first emission surface 34 and the support portion 46 may be in contact with each other through an air layer. In the first embodiment, a case where the first emission surface 34 and the support portion 46 are optically integrated by adhesion or welding will be described as an example. By adopting such an integrated configuration, it is possible to suppress interface reflection between the support portion 46 of the second lens portion and the first emission surface 34 of the first lens portion, and to reduce light loss. As shown in FIG. 2, the optical lens 20 may be supported by the lens holder 15 on the outer periphery of the support portion 46.

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

  First, the path of the small-angle light S1 having a small angle from the reference line 16 will be described. The small angle light S <b> 1 is controlled by the first lens unit 30. The small-angle light S <b> 1 reaches the light incident inner side surface 32 on the way through the light incident hole 31 and enters the first lens unit 30. At this time, the small-angle light S <b> 1 incident on the incident light inner surface 32 is refracted in a direction away from the optical axis 14 and enters the first lens unit 30. The small-angle light S <b> 1 that has entered the first lens unit 30 reaches the first reflecting surface 33, and after being totally reflected, reaches the first emitting surface 34. Since the irradiation side of the first emission surface 34 and the light source 10 side of the support portion 46 are optically integrated, the small angle light S1 reaching the first emission surface 34 is not reflected or refracted. The light reaches the support portion 46 and is emitted from the support portion 46 at an angle substantially parallel to the optical axis 14.

  Next, the path of the medium-angle light M1 having a medium angle from the reference line 16 will be described. The medium angle light M1 is controlled by the second lens unit 40. The medium angle light M1 enters the second lens unit 40 from the inner side surface 42 of the light incident recess 41. At this time, the medium-angle light M <b> 1 incident on the inner side surface 42 of the light incident recess 41 is refracted in a direction away from the optical axis 14 and enters the second lens unit 40. The medium-angle light M1 incident on the second lens unit 40 reaches the second reflecting surface 44 and is totally reflected, and then exits the optical lens 20 from the second exit surface 45 at an angle substantially parallel to the optical axis 14. .

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

  FIG. 3 is a diagram showing the exit angle of the completely diffusing light source and the ratio of the luminous flux. A general LED light source has a light distribution characteristic close to perfect diffusion, and therefore shows a distribution of light flux as shown in FIG. According to FIG. 3, it can be seen that the light from the light source 10 has a larger amount of light with a medium emission angle, that is, medium angle light than that of light with a large emission angle, that is, small angle light. In the first embodiment, for example, as shown in FIG. 2, in the optical lens 20, the range in which the first reflection surface 33 is provided and the range in which the second reflection surface 44 is provided are in the optical axis 14 direction (arrow y direction). You may be comprised so that it may overlap in part in projection. When the optical lens 20 is configured in this way, a part of the small-angle light having a small angle from the reference line 16 is reflected by the connection surface 35 after being reflected by the first reflecting surface 33, so that the small-angle light is reflected. The controllability is reduced. However, since the second reflection surface 44 can be made large, the solid angle at which the inner side surface 42 of the light incident recess 41 receives light from the light source 10 is increased, and the medium angle light controlled by the second reflection surface 44 is obtained. The angle range can be expanded. Further, as described above, the amount of light of medium-angle light is larger than the amount of light of small-angle light, so that the amount of light controlled by the second reflecting surface 44 is efficiently increased by widening the solid angle of the inner surface 42. Can be made. Therefore, as a whole, the proportion of light that can control the direction of irradiation light increases in the optical lens 20.

  As described above, in the first embodiment, the optical lens 20 includes the first lens unit 30 disposed on the emission side of the light source 10 and the second lens unit 40 disposed on the optical axis 14 side of the first lens unit 30. The first lens unit 30 is an inner surface of a light incident hole 31 penetrating along the optical axis 14, and changes the traveling direction of light emitted from the light source 10. A light incident inner side surface 32 on which light from the light source 10 enters, a first emission surface 34 that emits light incident on the light incident inner side surface 32, and the light incident inner side surface 32 from the light source 10 side to the first emission surface 34. A first reflecting surface 33 that extends and reflects light incident from the light incident inner side surface 32 to the irradiation side; and a connection surface 35 that extends from the irradiation side of the light incident inner side surface 32 to the first emission surface 34. The lens unit 40 has a concave shape opened to the light source 10 side, and the light incident hole of the first lens unit 30. 1 from the light source 10 side of the inner surface 42 of the light incident recess 41, the second light exit surface 45 for emitting the light incident on the light incident recess 41, and the light incident recess 41. A second reflecting surface 44 that extends to the two exit surfaces 45 and reflects light incident from the inner side surface 42 of the light incident recess 41 to the irradiation side, and the connection surface 35 of the first lens unit 30 is a second lens unit. The light incident inner surface 32 and the inner surface 42 of the light incident recessed portion 41 are arranged so that the light incident direction from the light source 10 is the first reflective surface 33 or the second reflective surface. It has a shape that refracts light so as to approach the surface 44.

  Accordingly, the light incident inner surface 32 and the inner surface 42 of the light incident recess 41 each refract the light incident on the optical lens 20 from the light source 10 so as to approach the first reflecting surface 33 or the second reflecting surface 44. The direction of the incident light is controlled by each reflecting surface.

  By the way, in a conventional lens (for example, refer to Patent Document 1) in which light travels almost straight on the incident surface and is taken in, the diameter or thickness is increased in order to guide the incident light to the reflecting surface. On the other hand, the optical lens 20 of Embodiment 1 can increase the amount of light reaching the reflecting surface without increasing the size of the lens by the above configuration. As a result, the optical lens 20 can increase the proportion of light that can be controlled to radiate in a predetermined direction, and can achieve high efficiency. The second reflection surface 44 and the connection surface 35 are disposed so as to face each other. However, when the air layer formed between the second reflection surface 44 and the connection surface 35 is set narrow, the light incident on the air layer, that is, the light that is not controlled by the lens. Can be reduced. Therefore, the optical lens 20 and the light source device 1 can be reduced in size without greatly impairing the light condensing performance of the optical lens 20.

  Further, the light incident inner surface 32 and the inner surface 42 of the light incident recess 41 each have an inclination closer to the optical axis 14 toward the irradiation side, and the inclination of the inner surface 42 of the light incident recess 41 is equal to the light incident inner surface. It is larger than the inclination of 32.

  Thereby, the inclination of the second reflection surface 44 for obtaining reflected light substantially parallel to the optical axis 14 can be made smaller than the inclination of the first reflection surface 33. Therefore, a large difference in diameter between the second reflecting surface 44 and the first reflecting surface 33 can be taken, and the light reflected by the first reflecting surface 33 can be prevented from being obstructed by the connection surface 35. The light utilization efficiency of the lens 20 can be increased.

  The second lens portion 40 includes a support portion 46 that extends from the second emission surface 45 to the outer peripheral side, is disposed on the irradiation side of the first emission surface 34, and is optically bonded to the first emission surface 34. Is.

  Accordingly, when the first emission surface 34 of the first lens unit 30 and the second lens unit 40 are optically bonded, the boundary air layer disappears, and reflection or refraction by the air layer is suppressed. Therefore, the light use efficiency of the optical lens 20 is improved.

  The light source device 1 includes a light source 10 that emits light and an optical lens 20. Thereby, the highly efficient and small light source device 1 can be provided.

Embodiment 2. FIG.
FIG. 4 is an exploded perspective view showing the light source device according to the second embodiment. FIG. 5 is a cross-sectional view showing a light path of the light source device according to the second embodiment. Based on FIG. 4 and FIG. 5, the light source device 100 of Embodiment 2 is demonstrated. In the second embodiment, the shape of the first lens portion 130 of the optical lens 120 is different from that of the first embodiment. Portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and description will be made centering on differences from the first embodiment.

  In the second embodiment, the first lens unit 130 has a light incident inner side surface 132, a first emission surface 134, a first reflection surface 133, a connection surface 135, and the like. The first lens portion 130 is provided with a light incident hole 131 that penetrates 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 first reflecting surface 133.

  The first reflecting surface 133 has a rotating body shape with the optical axis 14 of the light source 10 as the rotation axis. As shown in FIG. 5, the first reflecting surface 133 of the first lens unit 130 and the second reflecting surface 44 of the second lens unit 40 are in the region Q in the projection in the direction of the optical axis 14 (arrow y direction). They are arranged so as to overlap. The region Q of the first reflecting surface 133 and the other regions are formed so that the slopes of the surfaces are different. The region Q of the first reflecting surface 133 reflects a part of the light incident into the first lens unit 130 from the light incident inner surface 132 and guides it toward the first emitting surface 134. Specifically, the region Q totally reflects the light that has reached the region Q, and makes the light tilted by an angle β toward the outer peripheral side from the direction of the optical axis 14 (arrow y direction). Further, the other region of the first reflecting surface 133 reflects the light incident on the first lens unit 130 from the light incident inner surface 132 and guides it toward the first emitting surface 134. Specifically, the other region totally reflects the light that has reached the other region, and makes the light substantially parallel to the optical axis 14.

  The angle β is defined by the distance D1 between the position of the first reflecting surface 133 closest to the light source 10 and the position of the connection surface 135 closest to the irradiation side in the arrow x direction, and the first lens unit 130 in the arrow y direction. It is an angle satisfying (Expression 1) expressed using the thickness T1.

[Equation 1]
β> arctan (D1 / T1) (Formula 1)

  FIG. 5 shows a plurality of light paths emitted from the center Po of the light source 10 and passing through the light source device 100. Hereinafter, the path of light emitted in different directions from the reference line 16 with the reference line 16 perpendicular to the optical axis 14 (in the direction of the arrow x) passing through the center Po as an angle of 0 ° will be described.

  First, the path of the small-angle light S2 having a small angle from the reference line 16 will be described. The small angle light S <b> 2 is controlled by the first lens unit 130. The small-angle light S <b> 2 reaches the light incident inner side surface 132 on the way through the light incident hole 131 and enters the first lens unit 130. At this time, the small-angle light S <b> 2 incident on the incident light inner surface 132 is refracted in a direction away from the optical axis 14 and enters the first lens unit 130. The small-angle light S <b> 2 that has entered the first lens unit 130 reaches another region of the first reflecting surface 133, and after being reflected, reaches the first emitting surface 134. Then, the small-angle light S <b> 2 that has reached the first emission surface 134 proceeds to the support portion 46 and is emitted from the support portion 46 at an angle substantially parallel to the optical axis 14.

  Next, the path of the minimal angle light SS2 whose angle from the reference line 16 is further smaller than the small angle light S2 will be described. The minimal angle light SS2 is also controlled by the first lens unit 130. The minimal angle light SS <b> 2 enters the first lens unit 130 from the light incident inner side surface 132. At this time, the minimal angle light SS2 incident on the incident light inner surface 132 is refracted in a direction away from the optical axis 14 and enters the first lens unit 130. The minimal angle light SS <b> 2 that has entered the first lens unit 130 reaches the region Q of the first reflecting surface 133. The minimal angle light SS <b> 2 is reflected by the region Q and reaches the first emission surface 134 as light inclined toward the outer circumference side by the angle β with respect to the optical axis 14. The minimal angle light SS2 that has reached the first emission surface 134 passes through the support portion 46 and is emitted out of the optical lens 120 at an angle slightly inclined with respect to the optical axis 14. That is, the minimal angle light SS2 travels outside the direction of the optical axis 14 in the first lens unit 130, and thus is emitted without passing through the connection surface 135.

  The medium-angle light M1 and the large-angle light L1 have the same paths as those in the first embodiment, and thus description thereof is omitted.

  As described above, also in the second embodiment, the light incident inner side surface 132 and the inner side surface 42 of the light incident recessed portion 41 respectively transmit light incident on the optical lens 120 from the light source 10 to the first reflecting surface 133 or the second reflecting surface. The direction of incident light that is refracted so as to approach 44 is controlled by each reflecting surface. Therefore, the optical lens 120 and the light source device 100 can improve the light use efficiency without increasing the size of the lens.

  The first reflecting surface 133 reflects incident light in a direction away from the optical axis 14 in a region Q overlapping with the second reflecting surface 44 in the projection in the direction of the optical axis 14. Thereby, it is possible to avoid the light reflected by the first reflecting surface 133 from reaching the connection surface 135.

  By the way, as a comparative example, there is a lens in which a plurality of reflection surfaces are formed by providing an air layer in one lens and the diameter is reduced (for example, Japanese Patent No. 5187342). In such a lens, for example, the light reflected by the outer reflecting surface may be further reflected by the outer peripheral surface forming the air layer, and uncontrollable light may be emitted. On the other hand, in the second embodiment, the light that has entered the first lens unit 130 and has reached the region Q is slightly reflected from the direction of the optical axis 14 to the outer peripheral side, and therefore does not reach the connection surface 135 and maintains controllability. Is done. As a result, the optical lens 120 can reduce the ratio of the emitted light with its controllability lowered, and can improve the collimating performance.

Embodiment 3 FIG.
FIG. 6 is an exploded perspective view showing the light source device according to the third embodiment. FIG. 7 is a cross-sectional view illustrating a light path of the light source device according to the third embodiment. A light source device 200 according to Embodiment 3 will be described with reference to FIGS. The third embodiment is different from the first embodiment in the shape of the first lens portion 230 of the optical lens 220 and the point that the light distribution control plate 60 is added. Portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and description will be made centering on differences from the first embodiment.

  In the third embodiment, the first lens unit 230 includes a light incident inner side surface 232, a first emission surface 234, a first reflection surface 233, a connection surface 235, and the like. Further, the first lens portion 230 is provided with a light incident hole 231 penetrating along the optical axis 14. Each configuration of the first lens unit 230 is substantially the same as that of the first embodiment except for the first reflecting surface 233.

  The first reflecting surface 233 has a rotating body shape with the optical axis 14 of the light source 10 as a rotation axis, and the diameter increases as the distance from the light source 10 increases. The first reflecting surface 233 extends from the light incident inner side surface 232 to the first emission surface 234 from the light source 10 side, reflects light incident from the incident light inner surface 232, and guides the light toward the first emission surface 234. Specifically, the first reflecting surface 233 totally reflects the light incident from the light incident inner side surface 232, and makes the light inclined at an angle γ toward the outer peripheral side from the optical axis 14 direction (arrow y direction). Therefore, for example, the first reflecting surface 233 of the third embodiment has a shape that is wider than the first reflecting surface 33 of the first embodiment in a direction (arrow x direction) perpendicular to the optical axis. As shown in FIG. 7, the first reflecting surface 233 and the second reflecting surface 44 are arranged so as to overlap in a part of the region in the projection in the direction of the optical axis 14 (arrow y direction).

  The angle γ is the distance D2 between the position closest to the light source 10 of the first reflecting surface 233 and the position closest to the irradiation side of the connection surface 235 in the arrow x direction, and the first lens unit 230 in the arrow y direction. It is an angle satisfying (Expression 2) expressed using the thickness T2.

[Equation 2]
γ> arctan (D2 / T2) (Formula 2)

  A light distribution control plate 60 that controls the direction of light emitted from the optical lens 220 is disposed on the irradiation side of the optical lens 220. The optical lens 220 and the light distribution control plate 60 are positioned by the lens holder 15.

  The light distribution control plate 60 is formed in a ring shape having an inner diameter substantially equal to the outer diameter of the second reflecting surface 44. 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 includes a prism incident surface 61 on which light from the optical lens 220 is incident, a prism emission surface 62 that emits light incident from the prism incident surface 61 to the outside of the light distribution control plate 60, and a prism incident surface 61. And a prism boundary surface 63 connecting the prism exit surface 62. The prism incident surface 61 is composed of a surface substantially perpendicular to the optical axis 14, and the prism exit surface 62 is composed of an inclined surface having an inclination such that the thickness of the light distribution control plate 60 increases as it approaches the optical axis 14. Has been. The prism boundary surface 63 constitutes the ring-shaped inner periphery of the light distribution control plate 60.

  In the third embodiment, the light incident inner surface 232 and the first reflecting surface 233 are configured such that the angle γ satisfies (Equation 2). However, when the angle γ is large, the light incident inner surface 232 and the first reflecting surface 233 are substantially parallel to the optical axis 14. In order to obtain a proper light distribution, it is necessary to increase the thickness of the light distribution control plate 60. Therefore, it is desirable to set the angle γ as small as possible within the range satisfying (Expression 2).

  FIG. 7 shows a plurality of light paths emitted from the center Po of the light source 10 and passing through the light source device 200. The light incident on the light distribution control plate 60 is light emitted from the optical lens 220 through the first lens unit 230, such as the small-angle light S3 illustrated in FIG.

  A path of the small-angle light S3 having a small angle from the reference line 16 will be described. The small-angle light S3 is controlled by the first lens unit 230. The small angle light S <b> 3 enters the light incident inner side surface 232 in the middle of passing through the light incident hole 231, and enters the first lens unit 230. At this time, the small-angle light S <b> 3 incident on the incident light inner surface 132 is refracted in a direction away from the optical axis 14 and enters the first lens unit 230. The small-angle light S3 incident on the first lens unit 230 reaches the first reflecting surface 233, is reflected, and reaches the first emitting surface 234 as light inclined to the outer peripheral side of the angle γ with respect to the optical axis 14. . The small-angle light S <b> 3 that has reached the first emission surface 234 passes through the support portion 46 and is emitted out of the optical lens 220 at an angle slightly inclined with respect to the optical axis 14. Then, the small-angle light S <b> 3 emitted from the support unit 46 to the outside of the optical lens 220 enters the light distribution control plate 60 from the prism incident surface 61. The small-angle light S3 is refracted by the prism entrance surface 61 and the prism exit surface 62, and exits the light distribution control plate 60 at an angle substantially parallel to the optical axis 14.

  On the other hand, among the light emitted from the optical lens 220, the medium angle light M1 and the large angle light L1 that are not incident on the light distribution control plate 60 are emitted to the outside of the optical lens 220 through the same path as that of the first embodiment. Irradiated.

  In the third embodiment, the light distribution control plate 60 controls the light to be emitted at an angle substantially parallel to the optical axis 14, but the present invention is not limited to this, and is adjusted to a desired light distribution. The shapes of the prism entrance surface 61 and the prism exit surface 62 may be changed as appropriate. In the third embodiment, the light distribution control plate 60 is formed in a ring shape, but is not limited to this. For example, the light distribution control plate 60 is formed in a ring shape or a cover so as to cover the entire irradiation side of the second lens unit 40. A plurality of lattice-like prisms may be arranged, or a rough surface or the like may be formed. Further, the light distribution control plate 60 may be configured to be optically integrated with the optical lens 220. With such a configuration, reflection loss at the boundary surface is reduced, and light use efficiency can be increased. .

  As described above, also in the third embodiment, the light incident inner side surface 232 and the inner side surface 42 of the light incident recessed portion 41 respectively transmit light incident on the optical lens 220 from the light source 10 to the first reflecting surface 233 or the second reflecting surface. The direction of incident light that is refracted so as to approach 44 is controlled by each reflecting surface. Therefore, the optical lens 220 and the light source device 200 can increase the light use efficiency without increasing the size of the lens.

  Further, at least a part of the first reflecting surface 233 reflects incident light in a direction away from the optical axis 14. As a result, it is possible to prevent the light reflected by the first reflecting surface 233 from reaching the connection surface 235 and to prevent the controllability from decreasing. Therefore, the optical lens 220 can efficiently emit the light having the uniform light distribution from the first lens unit 230.

  The light source device 200 further includes a light distribution control plate 60 that is disposed on the irradiation side of the optical lens 220 and refracts light emitted from the optical lens 220 tilted in a direction away from the optical axis 14 to the optical axis 14 side. Is.

  Accordingly, the light source device 200 can produce a desired light distribution by including the light distribution control plate 60, and can increase the amount of light emitted to a desired range and irradiate it with high efficiency.

  The light source device 200 is disposed on the irradiation side of the first lens unit 230, and the traveling direction of the light reflected and emitted from the first reflecting surface 233 is the traveling direction of the light incident on the light incident recess 41. The light distribution control plate 60 is further provided.

  Thus, by providing the light distribution control plate 60, it is possible to make a desired light distribution, to increase the light entering the desired range, leading to higher efficiency. In particular, in Embodiment 3, the optical lens 220 has high directivity by including the first reflecting surface 233. By using the light distribution control plate 60 together with such an optical lens 220, the light distribution controllability is achieved. High irradiation light can be extracted.

Embodiment 4 FIG.
FIG. 8 is an exploded perspective view showing the light source device according to the fourth embodiment. FIG. 9 is a cross-sectional view illustrating a light path of the light source device according to the fourth embodiment. Based on FIG. 8 and FIG. 9, the light source apparatus 300 of Embodiment 4 is demonstrated. In the fourth embodiment, the shape of the optical lens 320 is different from that of the first embodiment. Portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and description will be made centering on differences from the first embodiment.

  The optical lens 320 includes a first lens unit 330 and a second lens unit 340. Also in the fourth embodiment, the first lens unit 330 is provided with a light incident hole 331, and the first lens unit 330 includes a light incident inner side surface 332, a first emission surface 334, a first reflection surface 333, Connecting surface 335 and the like.

  The second lens unit 340 includes a light incident concave part 341 and an incident refractive surface 347 on the light source 10 side, an outgoing concave part 348, a second outgoing plane 345, a support part 346 on the irradiation side, and a second outgoing plane from the incident refractive surface 347. A second reflecting surface 344 extending to 345 is included. In the fourth embodiment, the opening width of the light incident recess 341 is narrower than the opening width of the light incident inner side surface 332, and the light incident recess 341 and the second reflecting surface 344 are connected by the incident refracting surface 347. Yes. The incident refracting surface 347 has a rotational shape in which the optical axis 14 is a rotational axis and the diameter increases as the distance from the light source 10 increases. Light that has been emitted from the light source 10 and passed through the light incident hole 331 is incident on the light incident recess 341 and the incident refracting surface 347. The incident refracting surface 347 refracts part of the light incident from the light source 10 in the direction along the optical axis 14.

  In the first embodiment, the light incident concave portion 41 is configured by the inner side surface 42 and the convex lens portion 43. However, in the fourth embodiment, the light incident concave portion 341 is a plane substantially perpendicular to the inner side surface 342 and the optical axis 14. And an upper surface 343 having a shape. The upper surface 343 refracts light incident from the light source 10 in a direction approaching the optical axis 14 direction (arrow y direction).

  The exit concave portion 348 is provided in the center of the second lens portion 340 on the irradiation side, and has a concave shape opened to the irradiation side. The outer periphery of 348 is flat. The exit concave portion 348 includes an inner side surface 349 that forms a concave side surface and an exit refracting surface 350 that forms a bottom surface. The exit refracting surface 350 has a convex shape on the exit surface side, and is configured such that the thickness of the second lens portion 340 decreases as the distance from the optical axis 14 increases. The second exit plane 345 is provided on the outer peripheral side of the exit recess 348 and is configured by a ring-shaped plane that is substantially perpendicular to the optical axis 14. The second emission plane 345 causes the light incident from the incident refracting surface 347 and the inner side surface 342 of the light incident recess 341 to be emitted out of the optical lens 320. The exit refracting surface 350 further refracts the light incident on the upper surface 343 of the light incident recess 341 and refracted so as to approach the optical axis 14, and emits the light to the outside of the optical lens 320 as light substantially parallel to the optical axis 14.

  The first lens unit 330 and the second lens unit 340 are arranged and combined in the same manner as in the first embodiment. That is, the connection surface 335 and the second reflection surface 344 are arranged so as to face each other with an air layer between them, and the irradiation side of the first emission surface 334 and the light source 10 side of the support portion 346 are optically Are bonded together.

  FIG. 9 shows a plurality of light paths that pass through the light source device 300 emitted from the center Po of the light source 10. Hereinafter, the path of light emitted in different directions from the reference line 16 with the reference line 16 perpendicular to the optical axis 14 (in the direction of the arrow x) passing through the center Po as a 0 ° line will be described.

  First, the path of the small-angle light S4 having a small angle from the reference line 16 will be described. Controlled by the small-angle light S4 and the first lens unit 330. The small-angle light S <b> 4 reaches the light incident inner side surface 332 on the way through the light incident hole 331 and enters the first lens unit 330. At this time, the small-angle light S4 incident on the light incident inner side surface 332 is refracted in a direction away from the optical axis 14 and enters the first lens unit 330. The small-angle light S4 incident on the first lens unit 330 is totally reflected by the first reflecting surface 333 and becomes light substantially parallel to the optical axis 14. The small-angle light S4 that has reached the first emission surface 334 reaches the support portion 346 and is emitted out of the optical lens 320.

  Next, the medium angle light M4 close to the small angle light S4 and the medium angle light MM4 having a larger angle than the medium angle light M4 among the light having a medium angle from the reference line 16 will be described.

  The medium angle light M4 is controlled by the second lens unit 340. The medium-angle light M4 enters the second lens unit 340 from the incident refracting surface 347. At this time, the medium angle light M <b> 4 is refracted in the direction along the optical axis 14 on the incident refracting surface 347 and enters the second lens unit 340. The medium-angle light M4 incident on the second lens unit 340 is emitted from the second emission plane 345 to the outside of the optical lens 320.

  The medium angle light MM4 is controlled by the second lens unit 340. The medium angle light MM4 enters the second lens portion 340 from the inner side surface 342 of the light incident recess 341. At this time, the medium-angle light MM4 is refracted in the direction away from the optical axis 14 on the inner side surface 342 of the light incident recess 341, and enters the second lens portion 340. The medium angle light MM4 incident on the second lens unit 340 reaches the second reflecting surface 344 and is totally reflected, and then exits the optical lens 320 from the second exit plane 345 at an angle substantially parallel to the optical axis 14. .

  Next, the path of the large-angle light L4 having a large angle from the reference line 16 will be described. The large-angle light L4 enters the second lens unit 340 from the upper surface 343 of the light incident recess 341. The large-angle light L4 is refracted in the direction approaching the direction of the optical axis 14 on the upper surface 343 and guided to the exit refracting surface 350. The large-angle light L4 is further refracted by the exit refracting surface 350, and exits the optical lens 320 as light substantially parallel to the optical axis 14.

  As described above, also in the fourth embodiment, the light incident inner side surface 332 and the inner side surface 42 of the light incident concave portion 41 respectively transmit light incident on the optical lens 320 from the light source 10 to the first reflecting surface 333 or the second reflecting surface. The direction of incident light that is refracted so as to approach 44 is controlled by each reflecting surface. Therefore, the optical lens 320 and the light source device 300 can improve the light use efficiency without increasing the size of the lens.

  The second lens unit 340 is provided between the light incident recess 341 and the second reflecting surface 344, and has an incident refracting surface 347 that refracts light incident from the light source 10 to the irradiation side.

  Thus, by providing the incident refracting surface 347 around the light incident recess 341, the diameter of the outgoing refracting surface 350 can be reduced. In the fourth embodiment, the large-angle light is redirected along the direction of the optical axis 14 by the upper surface 343 of the light incident recess 341 and the exit refracting surface 350 of the exit recess 348. Even in such a configuration, since the distance between the exit refracting surface 350 and the second reflecting surface 344 is secured by the entrance refracting surface 347, the reflected light from the second reflecting surface 344 is prevented from being disturbed by the exit refracting surface 350. Can be suppressed. As a result, the optical lens 320 can efficiently control the light from the light source 10 within a desired light distribution angle range, and can efficiently illuminate a predetermined range.

Embodiment 5. FIG.
FIG. 10 is a perspective view showing an illumination apparatus according to Embodiment 5. In FIG. Based on FIG. 10, the illuminating device 400 of Embodiment 5 is demonstrated. Illumination device 400 according to Embodiment 5 uses light source device 1 according to Embodiment 1 as a spotlight. Portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and description will be made centering on differences from the first embodiment.

  In addition to the light source device 1, the lighting device 400 includes a housing 402 in which the light source device 1 is installed, a power source 401, a fixing bracket for attaching to the ceiling, and the like. The power source 401 is connected to the light source device 1 by a cable 403 and supplies predetermined power to the light source device 1. In order to improve the heat dissipation performance, the housing 402 may be provided with a heat sink made of, for example, aluminum die casting.

  Note that the light source devices 100, 200, and 300 according to Embodiments 2 to 4 may be applied as the light source device of the illumination device 400. Moreover, the illuminating device 400 is not limited to what is attached to a ceiling. For example, the lighting device 400 may be installed on a table, attached to a wall via a fixture, or used in other places or applications such as a vehicle headlight. Also good.

  As described above, in the fifth embodiment, the lighting device 400 includes the light source device 1, the housing 402 in which the light source device 1 is installed, and the power source 401 that supplies power to the light source device 1. Thus, since the illumination device 400 includes the light source device 1 that is small and highly efficient, the illumination range can be illuminated brightly, and a compact illumination device 400 can be provided.

  The embodiment of the present invention is not limited to the above embodiment, and various modifications can be made. A plurality of the above embodiments can be combined. For example, in the above embodiment, the light emitting element of the light source 10 is configured by using an LED, but may be configured by an LD (Laser Diode) or the like, and is configured by one light emitting element having a large light emitting surface area. It may be what was done. Further, the arrangement of the light source 10 is not limited to the arrangement in which the optical axis 14 of the optical lens 20 is the rotation axis, and a plurality of light sources may be arranged in a rectangular or polygonal shape.

  Moreover, although the aluminum substrate was used as the board | substrate 11 of the light source device 1, the board | substrate comprised with metal substrates, such as iron, or a cheaper glass epoxy resin or paper phenolic material, etc. may be used. Further, the material of the heat sink provided in the housing 402 is not limited to the aluminum die-cast material, and may be a metal such as iron, or a high thermal conductive resin.

  In the light source device 1, a heat conductive material such as a heat conductive grease or a heat 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-resistant temperature, lifetime, strength, and the like of the LED and circuit element to be used.

  Further, the shapes of the light incident recess 41, the light incident hole 31, the first reflecting surface 33, the second reflecting surface 44, and the like are not particularly limited. For example, a part of the light incident recess 41 may be formed in a hemispherical shape, a rotating paraboloid shape, a rotating ellipsoidal shape, or a rotating polynomial surface shape centered on the light source 10. Further, the shape of the exit refracting surface 350 is not particularly limited, and may be, for example, a concave shape, a plane, or a truncated cone.

  In addition, the surface and a part of the surface of the optical lens 20 may be subjected to light diffusion processing such as embossing in order to relax the irradiation image or reduce color unevenness on the irradiation surface.

  1, 100, 200, 300 Light source device, 10 light source, 11 substrate, 12 wire, 13 connector, 14 optical axis, 15 lens holder, 16 reference line 20, 120, 220, 320 optical lens, 30, 130, 230, 330 First lens part 31, 31, 131, 331 Light incident hole, 32, 132, 232, 332 Light incident inner surface, 33, 133, 233, 333 First reflection surface, 34, 134, 234, 334 First emission Surface, 35, 135, 235, 335 Connection surface, 40, 340 Second lens portion, 41, 341 Light incident concave portion, 42, 342 Inner side surface, 43 Convex lens portion, 44, 344 Second reflecting surface, 45 Second outgoing surface , 46, 346 Support part, 343 upper surface, 345 second exit plane, 347 entrance refracting surface, 348 exit recess, 349 inner surface, 350 exit Refracting surface, 60 the light distribution control plate, 61 a prism incident surface 62 prism exit surface, 63 prism interface, 400 illumination device, 401 power, 402 housing, 403 cable.

Claims (10)

An optical lens having a first lens portion disposed on the light emitting side of the light source and a second lens portion disposed on the optical axis side of the first lens portion, and changing the traveling direction of the light emitted from the light source. Because
The first lens unit is
An inner surface of an incident hole penetrating along the optical axis, and an incident inner surface on which light from the light source is incident;
A first exit surface for emitting the light incident on the incident light inner surface;
A first reflecting surface that extends from the light source side of the light incident inner surface to the first emission surface and reflects light incident from the light incident inner surface to an irradiation side;
A connection surface extending from the irradiation side of the light incident inner surface to the first emission surface,
The second lens unit is
A light incident concave portion into which light from the light source that has a concave shape opened to the light source side and passes through the light incident hole of the first lens portion is incident;
A second emission surface for emitting the light incident on the light incident recess,
A second reflecting surface that extends from the light source side of the inner surface of the light incident recess to the second exit surface and reflects light incident from the inner surface of the light incident recess to the irradiation side;
The connection surface of the first lens unit is disposed to face the second reflection surface of the second lens unit,
The inner surface of the light incident surface and the inner surface of the light incident recess have a shape that refracts light so that the traveling direction of light incident from the light source approaches the first reflecting surface or the second reflecting surface. .   Each of the light incident inner surface and the inner surface of the light incident recess has an inclination closer to the optical axis toward the irradiation side, and the inclination of the inner surface of the light incident recess is larger than the inclination of the light incident inner surface. The optical lens according to claim 1 which is large. The second lens unit is
The optical lens according to claim 1, further comprising an incident refracting surface that is provided between the light incident recess and the second reflecting surface and refracts light incident from the light source toward an irradiation side.   The optical lens according to claim 1, wherein at least a part of the first reflecting surface reflects incident light in a direction away from the optical axis.   The optical system according to any one of claims 1 to 3, wherein the first reflecting surface reflects incident light in a direction away from the optical axis in a region overlapping the second reflecting surface in projection in the optical axis direction. lens. The second lens unit is
6. The support unit according to claim 1, further comprising a support portion that extends from the second emission surface to the outer peripheral side, is disposed on the irradiation side of the first emission surface, and is optically bonded to the first emission surface. The optical lens described. A light source that emits light;
A light source device comprising: the optical lens according to claim 1.   The light source device according to claim 7, further comprising a light distribution control plate that is disposed on an irradiation side of the optical lens and refracts light emitted from the optical lens inclined in a direction away from the optical axis toward the optical axis.   A light distribution control plate that is disposed on the irradiation side of the first lens unit and aligns the traveling direction of the light reflected and emitted from the first reflecting surface with the traveling direction of the light incident on the light incident concave portion The light source device according to claim 7, further comprising: The light source device according to any one of claims 7 to 9,
A housing in which the light source device is installed;
And a power supply that supplies power to the light source device.

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