JP6429672B2 - Light emitting device and lighting apparatus using the same - Google Patents

Description

  The present invention relates to a light emitting device including a lens that distributes light emitted from a light emitting module and a lighting fixture using the same.

  2. Description of the Related Art A light emitting device is known in which an optical member (lens) that distributes light from a light emitting module to a wide angle is provided on the front surface of a light emitting module such as an LED. For example, an illuminating device such as an emergency light that illuminates a flat surface such as a floor surface is required to illuminate an irradiation surface with illuminance stipulated in a wide range of laws and regulations. Therefore, conventionally, there has been proposed an optical member having a so-called bad wing-like light distribution characteristic in which a concave portion is formed around the optical axis of the emission surface, and the luminous intensity increases as the angle increases from the front direction ( For example, see Patent Documents 1 and 2).

  In the luminaire described in Patent Document 1, an approximately cylindrical optical member is disposed inside the luminaire on the front surface of the light emitting module. This optical member has an incident surface located on the front surface of the light emitting module, an exit surface facing the entrance surface, and a side surface that connects the entrance surface and the exit surface and is a side of a cylindrical shape. The light emitted from the light emitting module is controlled to be in a bad wing-like light distribution by the light emitted directly from the emission surface and the light reflected on the side surface inside the optical member and emitted in the wide-angle direction from the emission surface. .

  In the light emitting device described in Patent Document 2, an approximately hemispherical optical member is disposed on the front surface of the light emitting module. This optical member emits light emitted from the optical member in a direction perpendicular to the reference optical axis as the angle formed between the light emitted from the light emitting module and the reference optical axis increases, resulting in a light distribution that is emitted in a wide range. Control as follows.

JP 2014-26933 A JP 2006-92983 A

  In the lighting fixture of Patent Document 1, the optical member is formed in a substantially columnar shape, and the height of the side surface and the diameter of the emission surface are formed in substantially the same size. For this reason, if a large-sized LED such as COB is used for the LED, it is necessary to increase the emission surface, and the entire optical member also increases. Therefore, the lighting fixture in which an optical member is arrange | positioned inside becomes large, and material, a weight, and cost increase.

  In addition, the light emitting device described in Patent Document 2 emits light with respect to the angle formed between the light emitted from the light emitting module and the reference optical axis as the angle formed between the light emitted from the light emitting module and the reference optical axis increases. It is formed in such a shape that the ratio of the angle formed between the light emitted from the apparatus and the reference optical axis is gradually decreased. Therefore, the lens diameter is much larger than the light emission diameter of the light source, and the luminaire body itself is increased in size, increasing the material, weight, and cost.

  Accordingly, the present invention has been made to solve the above-described problems, and a light-emitting device capable of suppressing the enlargement of the device while obtaining desired light distribution characteristics and a lighting fixture using the same. The purpose is to provide.

  The light-emitting device of the present invention includes a light-emitting module that emits light, an incident surface on which light emitted from the light-emitting module is incident, and an emission surface from which light incident on the incident surface is emitted. And a lens for controlling the light distribution of the emitted light, the emission surface extends from the optical axis toward the outer periphery, the emission angle of the light emitted from the light emitting module with respect to the optical axis becomes the first emission angle, and the first emission Outgoing light emitted from the light emitting module with respect to the optical axis is formed on the first emission surface of the light distribution where the emission angle at which the luminous intensity is the maximum is the first luminous intensity maximum emission angle, and the outer circumference of the first emission surface. The angle is the second emission angle, and the second emission angle is formed on the second emission surface of the light distribution where the emission angle at which the luminous intensity is maximum becomes the second luminous intensity maximum emission angle, and on the outer periphery of the second emission surface. Emission from light emitting module against axis The third light output angle is a third light output angle, and the light output angle of the third light output angle is the third light output angle. The maximum emission angle is larger than the first luminous intensity maximum emission angle and smaller than the second luminous intensity maximum emission angle.

  According to the light emitting device of the present invention, desired light distribution characteristics can be obtained without increasing the size of the lens by making the third luminous intensity maximum emission angle larger than the first luminous intensity maximum emission angle and smaller than the second luminous intensity maximum emission angle. Can do.

It is a perspective view which shows the lighting fixture using the light-emitting device which concerns on embodiment of this invention. It is sectional drawing of the lighting fixture shown in FIG. It is a disassembled perspective view which shows an example of the lighting fixture of FIG. It is a graph which shows the relationship between the angle from the optical axis in the light emitting module of FIG. 1, and luminous intensity. It is sectional drawing which shows preferable embodiment of the light-emitting device of this invention. It is a schematic diagram which shows an example of the lens in the light-emitting device of FIG. 7 is a graph showing light distribution characteristics of light emitted from the first emission surface, the second emission surface, and the third emission surface with respect to the emission angle of the light emitted from the light emitting module in FIGS. 5 and 6. 7 is a graph showing a relationship between an angle of light emitted from the light emitting module and an emission angle emitted from the lens 40 in the lens shown in FIGS. 5 and 6. It is sectional drawing which shows an example of the conventional light-emitting device. It is sectional drawing which shows an example of the light-emitting device which concerns on another embodiment of this invention.

  Hereinafter, embodiments of a light emitting device of the present invention and a lighting fixture using the same will be described with reference to the drawings. 1 is a perspective view showing a lighting fixture using a light emitting device according to an embodiment of the present invention, FIG. 2 is a sectional view of the lighting fixture shown in FIG. 1, and FIG. 3 is an exploded view showing an example of the lighting fixture of FIG. It is a perspective view. The lighting fixture 1 in FIG. 1 is an example of an emergency lighting fixture, and the lighting fixture 1 includes a main body 10 and a light emitting device 20 that is a light source attached to the main body 10.

  The main body portion 10 has a cylindrical shape, and includes a cylindrical portion 10A that is open on one side and a flange portion 10B that is provided at an opening edge of the cylindrical portion 10A. 10 A of cylinder parts are inserted in the embedding hole formed in to-be-attached parts, such as a ceiling, and the flange part 10B is attached in the state which contacted the indoor side surface of the embedding hole. A locking tool 11 is provided on the side wall of the cylinder part 10A. When the cylinder part 10A is inserted into the embedding hole, the locking tool 11 is locked to the attached part, so that the main body part 10 is covered. Fixed to the mounting part.

  A battery 12 that supplies power to the light emitting device 20 in an emergency is accommodated in the cylinder portion 10A of the main body portion 10. The battery 12 is normally charged with power supplied via a lighting device (not shown). The battery 12 supplies charged power to the light emitting device 20 in an emergency. Note that the state of charge of the battery 12 can be confirmed by an inspection switch (not shown).

  The lighting fixture 1 includes an attachment member 13 to which the light emitting device 20 is fixed, and an outer frame 14 that attaches the attachment member 13 to the main body 10. The attachment member 13 is made of, for example, an aluminum alloy having excellent heat dissipation, and has a concave accommodating portion 13 a for accommodating the light emitting device 20. A socket 15 is attached to the accommodating portion 13 a from above the light emitting device 20, and the light emitting device 20 is fixed to the attachment member 13 while being sandwiched between the attachment member 13 and the socket 15. Note that the attachment member 13 may be formed with a plurality of fins for increasing the surface area in contact with the outside air and enhancing the heat dissipation.

  The outer frame 14 is formed in, for example, a circular shape, and has an opening 14 a for emitting light from the lens 40 on the front surface of the light emitting device 20. The outer frame 14 is formed with a ring portion 14b formed in a ring shape. The ring portion 14b has an inner diameter that can be accommodated by the attachment member 13, and has an outer diameter that is substantially the same as the outer peripheral edge of the flange portion 10B. The light emitting device 20 is attached to the main body portion 10 by fixing the ring portion 14b to the opening of the cylindrical portion 10A so as to cover the outer periphery of the flange portion 10B.

  The light emitting device 20 includes a light emitting module 30 that emits light and a lens 40 that controls light distribution of the light emitted from the light emitting module 30. The light emitting module 30 includes a substrate 31 and a light emitting unit 32 mounted on the substrate 31. As described above, the substrate 31 is attached to the attachment member 13, and heat is transmitted from the substrate 31 to the attachment member 13. The light emitting unit 32 includes a plurality of light emitting elements made of LEDs, for example, and is mounted on the wiring pattern of the substrate 31 by a COB (Chip On Board) technique. At this time, the light emitting unit 32 includes a light emitting element that emits blue light and a translucent wavelength conversion member that seals the light emitting element, and the blue light emitted from the light emitting element is wavelength-converted by the wavelength conversion member. Thus, white light may be emitted.

  The lens 40 is composed of, for example, a wide-angle light distribution lens, and is a light distribution control member that controls light emitted from the light emitting module 30 to a desired light distribution. The lens 40 is formed using a transparent material such as acrylic resin, polycarbonate, or glass, for example, and is disposed on the front side of the socket 15 so as to cover the light emitting module 30.

  Here, the light emitting module 30 irradiates light with the strongest light intensity on the optical axis, and has a rotationally symmetric light distribution characteristic in which the light intensity decreases as the angle from the optical axis increases. The luminous intensity IL (θ) of the light irradiated at the emission angle θ from the optical axis CL can be expressed, for example, by the following formula (1). In Equation (1), I0 is the luminous intensity in the front direction (θ = 0), and L is the total luminous flux emitted from the light emitting element.

  FIG. 4 is a graph showing the relationship between the angle from the optical axis and the luminous intensity in the light emitting module of FIG. In FIG. 4, the horizontal axis represents the emission angle θ from the optical axis CL, the left end represents the optical axis CL (θ = 0 °), and the right end represents a direction perpendicular to the optical axis CL (θ = 90 degrees). Indicates. Further, the luminous intensity IS (θ) in FIG. 4 is a necessary luminous intensity required in a predetermined illumination space.

  As shown in FIG. 4 and equation (1), the luminous intensity IL (θ) decreases as the emission angle θ increases. In a region where the emission angle θ is smaller than the angle θ1, the luminous intensity IL (θ) is larger than the required luminous intensity IS (θ), and sufficient illuminance is obtained. On the other hand, in the region where the emission angle θ is between the angles θ1 and θ2, the luminous intensity IL (θ) is smaller than the required luminous intensity IS (θ), and sufficient illuminance is not obtained. On the other hand, light is also irradiated to a region where the required light intensity IS (θ) where the emission angle θ is larger than the angle θ2 is not present.

  Therefore, the lens 40 emits light emitted in the direction in which the emission angle θ is larger than θ2 out of the light emitted from the light emitting unit 32 in the direction between the angles θ1 and θ2, and compensates for the insufficient illuminance. Have such light distribution characteristics as

  FIG. 5 is a sectional view showing a preferred embodiment of the light emitting device of the present invention, FIG. 6 is a schematic view showing an example of a lens in the light emitting device of FIG. 4, and the light emitting device 20 will be described with reference to FIGS. explain. 5 and 6, the optical axis CL of the lens 40 and the optical axis CL of the light emitting module 30 coincide with each other, and the lens 40 has a rotating body shape rotated about the optical axis CL. Illustrate. The lens 40 has an incident surface 41 on which light emitted from the light emitting module 30 is incident, and an output surface 42 from which light incident from the incident surface 41 is emitted. Then, the light from the light emitting module 30 is incident on the incident surface 41, propagates in the lens 40, and is emitted from the emitting surface 42 to the outside (in the air) according to Snell's law.

  The incident surface 41 is a substantially bowl-shaped concave portion, and is formed so that light in a specific angle range from the optical axis CL out of light emitted from the light emitting module 30 is incident. The specific angle range can be changed as appropriate depending on the distance to the light emitting module 30 or the arrangement structure of the light emitting module 30. In addition, the diameter size of the opening side of the concave portion on the incident surface 41 is formed larger than the diameter size of the light emitting portion 32, and the lens 40 controls the light distribution of the light beam emitted from the light emitting module 30. .

  The exit surface 42 is formed in a convex shape toward the outside, the first exit surface 42A spreading from the optical axis CL toward the outer periphery, and the second exit surface 42B formed on the outer periphery of the first exit surface 42A. And a third exit surface 42C formed on the outer periphery of the second exit surface. The first emission surface 42A, the second emission surface 42B, and the third emission surface 42C are formed in aspherical shapes defined by different shape formulas, and the maximum intensity light to be emitted has different emission angles. It is formed as follows. In addition, the case where each boundary of the 1st output surface 42A, the 2nd output surface 42B, and the 3rd output surface 42C does not connect smoothly but has illustrated is illustrated. As an example, the inclination of each exit surface with respect to the optical axis CL will be described using an angle IA formed on a horizontal line perpendicular to the optical axis CL and a straight line similar to each exit surface (or a tangent at an arbitrary point). Do.

  The inclination IA2 of the second emission surface 42B is formed larger than the inclination IA1 of the first emission surface 42A. Further, the inclination IA3 of the third emission surface 42C is formed larger than the inclination IA2 of the second emission surface 42B. Since the first emission surface 42A, the second emission surface 42B, and the third emission surface 42C have aspherical shapes, the first emission surface 42A, the second emission surface 42B, and the third emission surface 42C are the entire surface. However, the relationship at each boundary between the first emission surface 42A, the second emission surface 42B, and the third emission surface 42C is illustrated.

  FIG. 7 is a graph showing the light distribution characteristics of the light emitted from the first emission surface, the second emission surface, and the third emission surface with respect to the emission angle of the light emitted from the light emitting module 30 in FIGS. . The optical characteristics of the first emission surface 42A, the second emission surface 42B, and the third emission surface 42C will be described with reference to FIGS.

  Next, the light distribution characteristics at each exit surface will be described. Note that an angle formed between the optical axis CL and the outgoing light with the axis parallel to the optical axis CL is arbitrarily set as the outgoing angle θL in each outgoing face. 42 A of 1st output surfaces distribute light so that the output angle of the light radiate | emitted from the light emitting module 30 with respect to the optical axis CL may turn into 1st output angle (theta) L1. 42 A of 1st output surfaces control the light distribution of the light of angle (alpha) = 0 degree (optical axis CL) to angle (alpha) 1 (for example, 48 degrees) among the lights radiate | emitted from the light emitting module 30, for example. The first emission surface 42A has, for example, a convex aspheric shape in the light emission direction. As shown by the luminous intensity IL1 (θ) in FIG. 7, the first outgoing surface 42A has a light distribution characteristic in which the outgoing angle at which the luminous intensity is maximum among the first outgoing angles θL1 becomes the first luminous intensity maximum outgoing angle θL1max.

  The second emission surface 42B distributes light so that the emission angle of the light emitted from the light emitting module 30 with respect to the optical axis CL becomes the second emission angle θL2, and the second emission surface 42B is, for example, the light emitting module 30. The light distribution of light having an angle α = α1 to α2 (for example, 48 ° to 59 °) is controlled. As shown by the luminous intensity IL2 (θ) in FIG. 7, the second emission surface 42B has a light distribution characteristic in which the emission angle at which the luminous intensity is the maximum among the second emission angles θL2 is the second luminous intensity maximum emission angle θL2max. The second emission surface 42B is formed such that the second luminous intensity maximum emission angle θL2max is larger than the first luminous intensity maximum emission angle θL1max.

  The third emission surface 42C distributes light so that the emission angle of the light emitted from the light emitting module 30 with respect to the optical axis CL becomes the third emission angle θL3. For example, the third emission surface 42 </ b> C controls the light distribution of light having angles α <b> 2 to α <b> 3 (for example, 59 ° to 65 °) among the light emitted from the light emitting module 30. As shown by the luminous intensity IL3 (θ) in FIG. 7, the third outgoing surface 42C has a light distribution characteristic in which the outgoing angle at which the luminous intensity is maximum among the third outgoing angles θL3 becomes the third luminous intensity maximum outgoing angle θL3max.

  Here, as shown in FIG. 7, the third light intensity maximum emission angle θL3max of the light having the maximum intensity on the third emission surface 42C is larger than the first light intensity maximum emission angle θL1max of the first emission surface 42A, and the second emission surface. It is smaller than the second light intensity maximum emission angle θL2max of 42B. In other words, the light emitted from the third emission surface 42C interpolates the light emitted from the first emission surface 42A and the second emission surface 42B. As a result, the light distribution characteristic of the entire lens 40 becomes a bad wing type like the light intensity IL0 (θ) in FIG. 7, and for example, a desired required light intensity IS (θ) (see FIG. 4) can be obtained.

  FIG. 8 is a graph showing the relationship between the angle of light emitted from the light emitting module and the angle of emission emitted from the lens 40 in the lens shown in FIGS. 5 and 6. Note that the emission angles on the horizontal axis and the vertical axis in FIG. 8 indicate angles with respect to the optical axis CL. As shown in FIG. 8, the maximum emission angle on the first emission surface 42A is larger than the maximum emission angle on the second emission surface 42B and the maximum emission angle on the third emission surface 42C. In FIG. 8, the maximum emission angle on the first emission surface 42A is located at the connection portion between the first emission surface 42A and the second emission surface 42B, and the maximum emission angle on the second emission surface 42B is The case where it is located at the connecting portion between the second emission surface 42B and the third emission surface 42C is illustrated.

  In particular, the arbitrary angle α in the range of the angles α2 to α3 and the third emission angle θL3 of the light emitted from the third emission surface 42C have a relationship of (θL3 / α) <1. Therefore, the light emitted from the light emitting module 30 is distributed at the third emission angle θL3 smaller than the angle α on the third emission surface 42C, and is refracted and emitted to the optical axis CL side. The third emission angle θL3 of the light emitted from the third emission surface 42C is smaller than the second emission angle θL2 of the light emitted from the second emission surface 42B.

  According to the above-described embodiment, the third luminous intensity maximum emission angle θL3max is larger than the first luminous intensity maximum emission angle θL1max and smaller than the second luminous intensity maximum emission angle θL2max, so that the third emission is not increased. The light emitted from the surface 42C can interpolate the light emitted from the first emission surface 42A and the second emission surface 42B. For this reason, the light incident from the light emitting module 30 can be controlled to a predetermined light distribution (bad wing type).

  FIG. 9 is a cross-sectional view showing an example of a conventional light emitting device. In the conventional light emitting device 50 of FIG. 9, the lens 60 has a concave shape around the optical axis, and the light emitted from the light emitting module increases as the angle formed between the light emitted from the light emitting module 30 and the reference optical axis increases. And the reference optical axis, the ratio of the angle formed between the light emitted from the light emitting device and the reference optical axis is changed in a gradually decreasing direction. Therefore, the lens diameter is very large compared to the light emission diameter of the light source. Further, when the light emitting device 50 is used in a lighting fixture, it is necessary to enlarge the opening of the outer frame that covers the optical member so as not to lose the emitted light, which affects the design and enlarges the lighting fixture body itself. , Increase material, weight and cost.

  On the other hand, in the light emitting device 20 shown in FIGS. 5 and 6, desired light distribution characteristics (bad wing type) can be realized while preventing the lens 40 from becoming large. As a result, the loss of the emitted light can be suppressed and the opening of the decorative frame can be reduced, and the influence on the design surface of the lighting fixture 1 can be reduced.

  Further, as shown in FIG. 5, the inclination IA2 of the second emission surface 42B is formed larger than the inclination IA1 of the first emission surface 42A with respect to the direction orthogonal to the optical axis CL, and the third emission surface 42C When the inclination IA3 is formed larger than the inclination IA2 of the second emission surface 42B, the outer diameter of the lens 40 can be reduced, so that the enlargement of the lens 40 can be further suppressed.

  Further, as shown in FIG. 8, when the third emission angle θL3 of the light emitted from the third emission surface 42C is smaller than the second emission angle θL2 of the light emitted from the second emission surface 42B, the lens 40 is moved. Since it can be made small, the luminaire 1 can be downsized and a part of the lens 40 can be disposed inside the cylindrical portion 10A.

  In addition, the incident surface 41 has a concave shape that is recessed toward the output surface 42, and when the concave opening width is formed larger than the width of the light emitting module 30, the loss of light emitted from the light emitting module 30. Can be suppressed.

  The embodiment of the light emitting device 20 of the present invention and the lighting fixture 1 using the light emitting device 20 is not limited to the above embodiment, and can be variously modified as follows without departing from the gist of the present invention. It is. For example, in the present embodiment, an explanation is given using an emergency lighting fixture as an example of the lighting fixture 1 including the lens 40, but light emitted from the light emitting module 30 such as a downlight or a spotlight. May be a lighting fixture 1 that controls the light distribution to a desired light distribution.

  In the present embodiment, the second emission surface 42B and the third emission surface 42C are illustrated as being aspherical, but may be linear (tapered) or arcuate. Also good.

  Further, in the present embodiment, the case where the optical axis CL of the light emitting module 30 and the optical axis CL of the lens 40 coincide with each other is illustrated, but the present invention is also applied to the case where the optical axes are arranged differently. be able to. FIG. 10 is a cross-sectional view showing an example of a light emitting device according to another embodiment of the present invention. In the light emitting module 130 in the light emitting device 120 of FIG. 10, the light emitting unit 32 is disposed at the end of the substrate 31, and the light distribution control may be performed also on the light from the end of the light emitting module 130. .

  DESCRIPTION OF SYMBOLS 1 Lighting fixture, 10 main-body part, 10A cylinder part, 10B flange part, 11 latching tool, 12 battery, 13 attachment member, 13a accommodating part, 14 outer frame, 14a opening, 14b ring part, 15 socket, 20, 50, 120 light emitting device, 30, 130 light emitting module, 31 substrate, 32 light emitting unit, 40, 60 lens, 41 incident surface, 42 exit surface, 42A first exit surface, 42B second exit surface, 42C third exit surface, CL light Axis, IL0 (θ), IL1 (θ), IL2 (θ), IL3 (θ), IL10 (θ) Luminous intensity, IS (θ) Necessary luminous intensity, α angle, θ outgoing angle, θL1 first outgoing angle, θL2 first 2 emission angle, θL3 third emission angle, θL1max first luminous intensity maximum emission angle, θL2max second luminous intensity maximum emission angle, θL3max third luminous intensity maximum emission angle.

Claims (10)

A light emitting module that emits light;
A lens that has an incident surface on which light emitted from the light emitting module is incident and an output surface from which light incident on the incident surface is emitted, and that controls light distribution of the light emitted from the light emitting module; Prepared,
The exit surface is
The emission angle of light emitted from the light emitting module with respect to the optical axis from the optical axis is the first emission angle, and the emission angle at which the luminous intensity is maximum among the first emission angles is the first luminous intensity maximum. A first light exit surface of the light distribution to be the exit angle;
An emission angle of light emitted from the light emitting module with respect to the optical axis is a second emission angle formed on the outer periphery of the first emission surface, and an emission angle at which the luminous intensity is maximum among the second emission angles is a second A second light exit surface with a light distribution at a maximum light output angle;
An emission angle of light emitted from the light emitting module with respect to the optical axis is a third emission angle formed on the outer periphery of the second emission surface, and an emission angle at which the luminous intensity is maximum among the third emission angles is a third. A third light exit surface having a light distribution with a maximum light output angle;
The third light intensity maximum emission angle is larger than the first light intensity maximum emission angle and smaller than the second light intensity maximum emission angle. The first exit surface is formed such that an exit angle increases from the optical axis toward the outer periphery,
2. The light emitting device according to claim 1, wherein a maximum emission angle at the first emission surface is larger than a maximum emission angle at the second emission surface and a maximum emission angle at the third emission surface.   The light emitting device according to claim 1, wherein the first emission surface has an aspherical shape that is convex in the light emission direction.   The emission angle of light emitted from the third emission surface is formed to be smaller than the emission angle of light emitted from the second emission surface. 2. The light emitting device according to item 1. The inclination of the second emission surface with respect to the plane orthogonal to the optical axis is greater than the inclination of the first emission surface,
5. The light emitting device according to claim 1, wherein an inclination of the third emission surface with respect to a plane orthogonal to the optical axis is larger than an inclination of the second emission surface. The entrance surface has a concave shape that is recessed toward the exit surface side,
The light emitting device according to claim 1, wherein an opening width of the concave shape is formed larger than a width of the light emitting module.   The lens is configured to control light distribution in a bad wing manner by the outgoing light from the first outgoing surface, the outgoing light from the second outgoing surface, and the outgoing light from the third outgoing surface. The light emitting device according to claim 1.   The light-emitting device according to claim 1, wherein the lens is formed to be rotationally symmetric with respect to the optical axis. A light emitting device according to any one of claims 1 to 8,
An attachment member to which the light emitting device is fixed;
A luminaire comprising: a cylindrical member having an opening formed on one side, and a main body portion to which the attachment member having the light emitting device fixed thereto is attached.   The lighting device according to claim 9, wherein a battery that serves as a power supply source of the light emitting device is accommodated in the main body portion in an emergency.

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