JP2020184488A - Lens for lighting device and lighting device - Google Patents

Abstract

To provide a lens for a lighting device for deflecting light which is suitable for downsizing.SOLUTION: A lens (100) of a lighting device includes a body part (110), an outer periphery part (120), and a connection part (130). The body part (110) has: an inner incidence surface (112); an inner reflection surface (114); and an inner emission surface (116) provided with a convex lens (116c). The inner reflection surface (114) reflects light entering from the inner incidence surface (112). The outer periphery part (120) has an outer incidence surface (122), an outer reflection surface (124), and an outer emission surface (126). The outer reflection surface (124) reflects light entering from the outer incidence surface (122).SELECTED DRAWING: Figure 1

Description

The present invention relates to a lens for a luminaire and a luminaire.

A luminaire that deflects light emitted from a light source by a lens is known (Patent Document 1). Patent Document 1 describes an LED lighting device that converts the wavelength of light emitted from an LED and then emits the light in the same traveling direction by a lens. In the LED lighting device of Patent Document 1, the color unevenness of the irradiation surface is suppressed by converting the wavelength of the light emitted from the LED by the wavelength conversion member.

JP-A-2010-170734

In the LED lighting device of Patent Document 1, the traveling direction of light is aligned by the lens, but in order to widen the irradiation range from the LED lighting device, it is necessary to increase the size of the lens, and the light can be efficiently transmitted with a small lens. Could not be biased to. Further, if the lens is forcibly made smaller, chromatic aberration will increase.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens for a luminaire and a luminaire suitable for miniaturization for deflecting light.

The lens for a luminaire according to the present invention is a lens for a luminaire that transmits light emitted from a light source toward an optical axis. The lens for a lighting fixture includes a main body portion, an outer peripheral portion arranged around the main body portion, and a connecting portion for connecting the main body portion and the outer peripheral portion. The main body has an inner incident surface, an inner reflecting surface, and an inner emitting surface provided with a convex lens. The inner reflecting surface reflects light incident from the inner incident surface. The outer peripheral portion has an outer incident surface, an outer reflecting surface, and an outer emitting surface. The outer reflecting surface reflects light incident from the outer incident surface.

In certain embodiments, the inner reflective surface is configured to totally reflect light incident from the inner incident surface, and the outer reflective surface totally reflects light incident from the outer incident surface. It is configured.

In certain embodiments, the inclination of the inner reflective surface with respect to the optical axis is greater than the inclination of the outer reflective surface with respect to the optical axis.

In certain embodiments, the inclination of the inner incident surface with respect to the optical axis is 90 ° or less at any point on the inner incident surface.

In certain embodiments, a step is provided on the inside incident surface.

In certain embodiments, the center of the inner plane of incidence projects more with respect to the light source than the edges of the plane of incidence.

In certain embodiments, the outer edge of the inner plane of incidence extends in a direction orthogonal to the optical axis.

In certain embodiments, the inner exit surface is recessed with respect to the outer exit surface, and the convex lens is provided on the inner exit surface.

In certain embodiments, an uneven surface is provided in the center of the inner incident surface.

In certain embodiments, the luminaire lens further comprises a diffusing member that diffuses light emitted from the light source and transmitted through any of the main body, the outer periphery, and the connecting portion.

The luminaire according to the present invention includes the luminaire lens described above and a light source that emits light toward the luminaire lens.

According to the present invention, it is possible to provide a lens for a luminaire suitable for miniaturization for deflecting light.

(A) is a schematic perspective view of the luminaire lens of the present embodiment, and (b) is a schematic cross-sectional view of the luminaire lens of the present embodiment. It is a schematic diagram for demonstrating the deflection of light by the luminaire lens of this embodiment. (A) to (c) are schematic views for explaining the deflection of light by the luminaire lens of this embodiment, respectively. (A) is a schematic diagram of a luminaire lens of the present embodiment, (b) is a schematic diagram showing a part of (a), and (c) is a schematic diagram of the luminaire lens of the present embodiment. It is a schematic diagram for demonstrating the deflection of light by. (A) and (b) are schematic diagrams for explaining the deflection of light by the luminaire lens of this embodiment, respectively. (A) to (c) are schematic views for explaining the deflection of light by the luminaire lens of this embodiment, respectively. (A) and (b) are schematic diagrams for explaining the deflection of light by the luminaire lens of this embodiment, respectively. It is a schematic diagram for demonstrating the deflection of light by the luminaire lens of this embodiment. It is a schematic diagram of the lens for a lighting fixture of this embodiment. (A) and (b) are schematic views of the lens for a luminaire of this embodiment. It is a schematic diagram of the lens for a lighting fixture of this embodiment. (A) is a schematic perspective view of the luminaire lens of the present embodiment, and (b) is a schematic cross-sectional view of the luminaire lens of the present embodiment. It is a schematic exploded perspective view of the luminaire including the lens for the luminaire of this embodiment.

Hereinafter, embodiments of a lens for a luminaire according to the present invention will be described with reference to the drawings. In the figure, the same or corresponding parts are designated by the same reference numerals and the description is not repeated. In the specification of the present application, in order to facilitate understanding of the invention, the description may be made with reference to the X direction, the Y direction and the Z direction which are orthogonal to each other. For example, the X and Y directions are parallel to the horizontal direction, and the Z direction is parallel to the vertical direction. However, the X direction and the Y direction may be parallel to a direction other than the horizontal direction, and the Z direction may be parallel to a direction other than the vertical direction.

The luminaire lens 100 of the present embodiment will be described with reference to FIG. FIG. 1A is a schematic perspective view of the luminaire lens 100, and FIG. 1B is a schematic cross-sectional view of the luminaire lens 100. The luminaire lens 100 is used as a lens for a luminaire. The luminaire lens 100 deflects the light emitted from the light source of the luminaire in a predetermined direction.

As shown in FIG. 1A, the luminaire lens 100 has a target structure with respect to the central axis. The lens 100 for a luminaire has a structure in which a recessed protrusion formed at the center of a tip having a substantially conical shape is provided.

The luminaire lens 100 is formed of a transparent member. For example, the lens 100 for a lighting fixture is made of a polycarbonate resin or an acrylic resin. From the viewpoint of heat resistant temperature, the lens 100 for lighting equipment is preferably formed of a polycarbonate resin. In this specification, the lens 100 for a lighting fixture may be simply referred to as a lens 100.

FIG. 1B also shows the lens 100 and the light source 210 that irradiates the lens 100 with light. The lens 100 deflects the light from the light source 210.

The light source 210 emits light. Here, the light source 210 emits light in the −Z direction. The direction of the optical axis LX of the light source 210 is parallel to the Z axis. The light source 210 emits light having the strongest intensity with respect to the optical axis LX. The light emitted from the light source 210 travels while spreading along the −Z direction around the optical axis LX.

For example, the light source 210 is a light emitting diode (LED). The light source 210 may be a light bulb including a light emitting diode. Alternatively, the light source 210 may be an incandescent lamp or a fluorescent lamp.

The lens 100 deflects the light from the light source 210 in a predetermined direction. Here, the lens 100 deflects the light from the light source 210 so as to travel along the optical axis LX.

As shown in FIG. 1 (b), the lens 100 includes a main body portion 110, an outer peripheral portion 120, and a connecting portion 130. The main body portion 110, the outer peripheral portion 120, and the connecting portion 130 each have a symmetrical structure with respect to the optical axis LX. The main body 110 transmits the light from the light source 210. Further, the main body 110 refracts or reflects the light from the light source 210 to deflect it.

The main body 110 has an incident surface 112, a reflecting surface 114, and an emitting surface 116. The incident surface 112 faces the light source 210. The incident surface 112 extends substantially perpendicular to the optical axis LX.

The light from the light source 210 is incident on the incident surface 112. The intersection region of the incident surface 112 with the optical axis LX of the light source 210 preferably extends perpendicular to the optical axis LX. The light incident on the intersection region of the incident surface 112 from the light source 210 travels in the main body 110 with almost no refraction. When the light incident from the light source 210 to a region other than the intersection region of the incident surface 112 is incident on the incident surface 112, the light is refracted in the direction approaching the optical axis LX and travels in the main body 110.

The reflective surface 114 communicates with the outer end of the incident surface 112. The reflecting surface 114 is provided obliquely with respect to the optical axis LX.

The reflecting surface 114 reflects a part of the light incident on the incident surface 112 in a predetermined direction. The reflecting surface 114 reflects light incident from the outer end of the incident surface 112 along the optical axis LX. Typically, light traveling in a direction slightly away from the light source 210 with respect to the optical axis LX is refracted when incident on the incident surface 112 of the main body 110. The refracted light travels in the main body 110 toward the reflecting surface 114. When the light reaches the reflecting surface 114, the light is reflected on the reflecting surface 114 toward the optical axis LX. For example, it is preferable that the reflecting surface 114 totally reflects the light that reaches the reflecting surface 114.

A convex lens 116c is provided on the exit surface 116. The exit surface 116 emits light incident on the incident surface 112 to the outside. A part of the light incident on the incident surface 112 is emitted to the outside from the emitting surface 116 without being reflected by the reflecting surface 114. Further, another part of the light incident on the incident surface 112 is reflected by the reflecting surface 114 and then emitted to the outside from the emitting surface 116.

The exit surface 116 has a transmission exit surface 116a and a reflection emission surface 116b. The transmission exit surface 116a is located around the optical axis LX, and the reflection emission surface 116b is located farther from the optical axis LX than the transmission emission surface 116a. The transmission / exit surface 116a forms a convex lens 116c. The transmission emission surface 116a is recessed with respect to the reflection emission surface 116b, and is located closer to the light source 210 than the reflection emission surface 116b.

The transmission / exit surface 116a emits a part of the light incident on the incident surface 112 to the outside without being reflected by the reflection surface 114. The reflection emitting surface 116b emits a part of the light incident on the incident surface 112 to the outside after being reflected by the reflecting surface 114.

Typically, the light traveling from the light source 210 toward the direction near the optical axis LX is incident on the incident surface 112 of the main body 110 and travels in the main body 110, and is transmitted from the transmitted exit surface 116a to the main body 110. It is emitted to the outside of. Further, typically, the light traveling in a direction away from the light source 210 with respect to the optical axis LX enters the incident surface 112 of the main body 110 and travels in the main body 110, and the light travels in the main body 110 and is reflected in the reflecting surface 114. After being reflected in, it is emitted from the reflection emitting surface 116b to the outside of the main body 110.

The outer peripheral portion 120 is located around the main body portion 110. Specifically, the outer peripheral portion 120 is arranged so as to surround the periphery of the main body portion 110 with respect to the optical axis LX. Here, the outer peripheral portion 120 faces the entire side surface of the main body portion 110, and surrounds the side surface of the main body portion 110 in all directions. An annular prism is formed by the outer peripheral portion 120. However, the outer peripheral portion 120 may face only a part of the side of the main body portion 110.

Further, here, the height of the outer peripheral portion 120 (length in the Z direction) is larger than the height of the main body portion 110 (length in the Z direction). However, the height of the outer peripheral portion 120 may be substantially equal to the height of the main body portion 110, or may be smaller than the height of the main body portion 110.

The outer peripheral portion 120 has an incident surface 122, a reflecting surface 124, and an emitting surface 126. The reflective surface 114 of the main body 110 and the incident surface 122 of the outer peripheral 120 face each other. A recess is formed between the reflecting surface 114 of the main body 110 and the incident surface 122 of the outer peripheral portion 120. The angle formed by the reflecting surface 114 and the incident surface 122 is an acute angle.

The incident surface 122, the reflecting surface 124, and the emitting surface 126 of the outer peripheral portion 120 are located outside the incident surface 112, the reflecting surface 114, and the emitting surface 116 of the main body 110. Therefore, in the present specification, the incident surface 122, the reflecting surface 124, and the emitting surface 126 of the outer peripheral portion 120 may be described as the outer incident surface 122, the outer reflecting surface 124, and the outer emitting surface 126, respectively. Further, the incident surface 112, the reflecting surface 114, and the emitting surface 116 of the main body 110 may be described as the inner incident surface 112, the inner reflecting surface 114, and the inner emitting surface 116, respectively.

The incident surface 122 extends substantially parallel to the optical axis LX. The light emitted from the light source 210 and traveling in a direction away from the optical axis LX to some extent is incident on the outer peripheral portion 120 without being incident on the main body portion 110. In this case, the light is incident on the incident surface 122. When the light incident on the incident surface 122 is incident on the incident surface 122, the light is refracted in a direction away from the optical axis LX and travels in the outer peripheral portion 120.

The reflecting surface 124 communicates with the tip of the incident surface 122. The reflecting surface 124 is provided obliquely with respect to the optical axis LX. The inclination of the reflecting surface 124 with respect to the optical axis LX is larger than the inclination of the reflecting surface 114 with respect to the optical axis LX. Here, the inclination with respect to the optical axis LX indicates the angle between the surface with respect to the −Z direction and the target surface. For example, the inclination of the inner reflecting surface 114 with respect to the optical axis LX is 5 ° or more and 40 ° or less. The inclination of the outer reflecting surface 124 with respect to the optical axis LX is 30 ° or more and 50 ° or less.

The reflecting surface 124 reflects the light incident on the incident surface 122 in a predetermined direction. Typically, light traveling in a direction slightly away from the light source 210 with respect to the optical axis LX enters the outer incident surface 122, travels in the outer peripheral portion 120, and is reflected by the reflecting surface 124. For example, it is preferable that the reflecting surface 124 totally reflects the light passing through the outer peripheral portion 120.

The exit surface 126 emits the light reflected by the reflection surface 124 to the outside. Typically, the light reflected by the reflecting surface 124 travels inside the outer peripheral portion 120 and is emitted from the exit surface 126 to the outside of the outer peripheral portion 120.

The connecting portion 130 connects the main body portion 110 and the outer peripheral portion 120. The connecting portion 130 connects the end portion of the main body portion 110 in the −Z direction and the end portion of the outer peripheral portion 120 in the −Z direction. Here, the exit surface 126 of the outer peripheral portion 120 is connected flush with the end portion of the connecting portion 130 in the −Z direction. Further, the reflection emitting surface 116b of the main body 110 is connected flush with the end of the connecting portion 130.

According to the lens 100 of the present embodiment, the reflection surface 114 of the main body 110 can deflect the light from the light source 210 in a predetermined direction, and the reflection surface 124 of the outer peripheral portion 120 directs the light from the light source 210 in a predetermined direction. Can be deflected. Therefore, even if the lens 100 is thin, most of the light from the light source 210 can be deflected in a predetermined direction. Further, according to the lens 100, the convex lens 116c is provided on the exit surface 116 of the main body 110. Therefore, the light that does not pass through the reflecting surface 114 and / or the reflecting surface 124 can also be emitted by deflecting the light from the light source 210 in a predetermined direction.

It is preferable that the incident surface 112 is provided with a step 112p between the central portion and the outer end portion, and the central portion protrudes from the outer end portion with respect to the light source 210. As a result, it is possible to suppress the occurrence of total reflection on the transmission / exit surface 116a.

Further, it is preferable that the flat portion 112f is provided at the outer end portion of the incident surface 112. As a result, the inner reflecting surface 114 can be shortened, and the lens 100 can be miniaturized.

Further, it is preferable that the incident surface 112 is not provided with a recess. As a result, the outer reflecting surface 124 can be shortened and the lens 100 can be miniaturized.

Next, the deflection of light by the lens 100 of the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is a schematic diagram for explaining the deflection of light by the lens 100. Note that FIG. 2 describes the flow of light emitted from the light source 210, but it should be noted that the light source 210 is shown as a point light source here in order to avoid overly complicated explanation. .. However, it goes without saying that the light source 210 is not limited to the point light source.

As shown in FIG. 2, the light emitted from the light source 210 is incident from the inner incident surface 112 and the outer incident surface 122. Of the light incident on the inner incident surface 112, the light incident near the center of the inner incident surface 112 travels in the convex lens 116c of the main body 110. After that, the light is emitted from the transmission exit surface 116a.

Further, among the light incident on the inner incident surface 112, the light incident on the vicinity of the outer end portion of the inner incident surface 112 travels in the main body 110 and is reflected by the inner reflecting surface 114. After that, the light travels in the main body 110 and is emitted from the reflection emitting surface 116b.

The light incident on the outer incident surface 122 travels in the outer peripheral portion 120 and is reflected by the outer reflecting surface 124. After that, the light travels in the outer peripheral portion 120 and is emitted from the exit surface 126.

Although FIG. 2 shows the progress of light incident on the entire lens 100, the progress of light will be described below for each portion of the lens 100.

Next, the deflection of light by the lens 100 of the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 3A is a schematic view for explaining the progress of light transmitted through the convex lens 116c of the main body 110, and FIG. 3B is a schematic view for explaining the progress of light reflected by the inner reflecting surface 114. 3 (c) is a schematic diagram for explaining the progress of light reflected by the outer reflecting surface 124.

As shown in FIG. 3A, among the light emitted from the light source 210, the light whose emission angle with respect to the optical axis LX is at an angle θ1 or less is incident on the incident surface 112 of the main body 110 and refracted. After that, the light travels in the main body 110, reaches the transmission exit surface 116a, and is emitted to the outside from the transmission emission surface 116a.

As shown in FIG. 3B, among the light emitted from the light source 210, the light whose emission angle with respect to the optical axis LX is larger than the angle θ1 and the angle θ2 or less is incident on the incident surface 112 of the main body 110 and refracted. To do. After that, the light travels in the main body 110, reaches the inner reflecting surface 114, and is reflected by the reflecting surface 114. Typically, the reflecting surface 114 reflects light parallel to the optical axis LX. After that, the light travels in the main body 110 and is emitted in parallel with the optical axis LX on the emission surface 116.

In this case, since the light is refracted relatively small when it is incident on the incident surface 112, chromatic aberration is unlikely to occur. Further, even if the light is totally reflected on the reflecting surface 114, chromatic aberration hardly occurs. Further, since light is hardly refracted on the exit surface 116, chromatic aberration is unlikely to occur. Therefore, the occurrence of chromatic aberration of light can be suppressed.

As shown in FIG. 3C, among the light emitted from the light source 210, the light whose emission angle with respect to the optical axis LX is larger than the angle θ2 and the angle θ3 or less does not enter the inner incident surface 112 and is not incident on the outer incident surface 112. It is incident on 122 and refracted on the incident surface 122. After that, the light travels in the outer peripheral portion 120, reaches the reflecting surface 124, and is reflected by the reflecting surface 124. Typically, the reflecting surface 124 reflects light parallel to the optical axis LX. After that, the light travels in the outer peripheral portion 120 and is emitted on the exit surface 126 in parallel with the optical axis LX.

At least a part of the incident surface 112 of the main body 110 may extend perpendicular to the optical axis LX. Alternatively, the incident surface 112 of the main body 110 may be provided with a recess. However, it is preferable that the incident surface 112 of the main body 110 does not have a component whose inclination from the optical axis LX exceeds 90 °.

Next, the deflection of light by the lens 100 of the present embodiment will be described with reference to FIG. FIG. 4A is a schematic view of the lens 100 provided with a recess 112q on the incident surface 112, and FIG. 4B is a schematic view showing a part of FIG. 4A.

As shown in FIG. 4A, the lens 100 is provided with a recess 112q on the incident surface 112. Here, the recess 112q is located near the outside of the incident surface 112. The incident surface 112 is flat from the center to the outside and is recessed in the recess 112q. Further, the outer side of the incident surface 112 is projected further than the recess 112q.

As shown in FIG. 4B, the inside of the recess 112q shows an angle θa with respect to the optical axis LX. Here, the angle θa is less than 90 °. Further, the outside of the recess 112q shows an angle θb with respect to the optical axis LX. Here, the angle θb exceeds 90 °.

FIG. 4C is a schematic diagram for explaining the deflection of light by the lens 100 provided with the recess 112q on the incident surface 112. As shown in FIG. 4C, the light traveling in a direction slightly distant from the light source 210 with respect to the optical axis LX enters the incident surface 112 of the main body 110 and travels in the main body 110. It is emitted from the reflection emitting surface 116b to the outside of the main body 110.

Further, the light traveling in a direction further away from the light source 210 with respect to the optical axis LX is incident on the outer incident surface 122 without being incident on the inner incident surface 112 and is refracted on the incident surface 122. After that, the light travels in the outer peripheral portion 120, reaches the reflecting surface 124, and is reflected by the reflecting surface 124. Typically, the reflecting surface 124 reflects light parallel to the optical axis LX. After that, the light travels in the outer peripheral portion 120 and is emitted on the exit surface 126 in parallel with the optical axis LX.

In FIG. 4C, the light emitted from the light source 210 and incident on the incident surface 112 from the protrusion of the incident surface 112 is refracted in the direction away from the optical axis LX, and then reflected by the inner reflecting surface 114. Therefore, in the lens 100 of FIG. 4C, the lower part of the inner reflecting surface 114 is not used to deflect the light along the optical axis LX.

Here, with reference to FIGS. 4 and 5, the difference in light deflection by the lens 100 depending on the presence or absence of the recess 112q will be described. FIG. 5A is a schematic view for explaining the deflection of light by the lens 100 provided with the recess 112q on the incident surface 112, and FIG. 5B is a schematic view for explaining the light deflection by the lens 100 provided with the recess 112q on the incident surface 112. It is a schematic diagram for demonstrating the deflection of light by a non-lens 100. Note that FIG. 5 (b) shows the flow of light on the + X direction with respect to the optical axis LX after combining FIGS. 3 (b) and 3 (c).

As shown in FIG. 5A, the light emitted from the light source 210 and incident on the incident surface 112 from the protrusion of the incident surface 112 is refracted in the direction away from the optical axis LX and then reflected by the inner reflecting surface 114. Will be done. Therefore, in the lens 100 of FIG. 5A, the lower part of the inner reflecting surface 114 is not used to deflect the light along the optical axis LX.

Further, in the above description, the light source 210 has been described as a point light source, but here, the length of the light source 210 in the X direction is considered. For example, the length of the light source 210 in the X direction is defined as the length La. In one example, the light source 210 is a circular light source having a diameter of length La.

In this case, the light source 210 also emits light from a position separated by a length La from the optical axis LX. FIG. 5A shows a path in which this light enters the outer incident surface 122 without being blocked by the protrusions on the inner incident surface 112 and reaches the lower end of the outer reflecting surface 124. As described above, in order to utilize the light from the end portion of the light source 210, the height (length in the Z direction) of the outer reflecting surface 124 is H2, and the maximum radius of the lens 100 (that is, the main body portion 110). The length along the X direction on the + X direction side with the outer peripheral portion 120) needs to be the sum of the length La and the length Lb2.

As shown in FIG. 5B, the light emitted from the light source 210 and incident on the incident surface 112 from the outer tip of the incident surface 112 is refracted in the direction approaching the optical axis LX, and then on the inner reflecting surface 114. Be reflected. Therefore, in the lens 100 of FIG. 5B, even if the inner reflecting surface 114 is relatively long, the light emitted from the light source 210 on the optical axis LX is deflected along the optical axis LX, so that the light is internally reflected. It can be used down to the bottom of the surface 114.

Further, also in FIG. 5B, when the light source 210 emits light from a position separated by the length La from the optical axis LX, this light is not blocked by the inner incident surface 112 and is not blocked by the outer incident surface 122. It shows a path that enters the light source and reaches the lower end of the outer reflecting surface 124. As described above, in order to utilize the light from the end portion of the light source 210, the height (length in the Z direction) of the outer reflecting surface 124 is H1, and the maximum radius of the lens 100 (that is, the main body portion 110). The length along the X direction on the + X direction side with the outer peripheral portion 120) needs to be the sum of the length La and the length Lb1.

As can be understood from the comparison between FIGS. 5 (a) and 5 (b), the height H1 of FIG. 5 (b) can be made smaller than the height H2 of FIG. 5 (a). Further, the length Lb2 in FIG. 5B can be shorter than the length Lb1 in FIG. 5A. As described above, the lens 100 can be miniaturized because the incident surface 112 is not provided with the recess 112q.

The incident surface 112 of the main body 110 may be flat. However, it is preferable that the central portion of the incident surface 112 of the main body 110 protrudes from the end portion.

Next, the deflection of light by the lens 100 of the present embodiment will be described with reference to FIG. 6 (a) and 6 (b) are schematic views for explaining the deflection of light by the lens 100 whose entire incident surface 112 is flat, and FIG. 6 (c) is a central portion of the incident surface 112. It is a schematic diagram for demonstrating the deflection of light by the lens 100 projecting |

As shown in FIG. 6A, when the entire incident surface 112 is flat, the light incident on the incident surface 112 from the light source 210 passes through the main body 110 and is emitted from the exit surface 116. In particular, the light emitted from the light source 210 toward the direction near the optical axis LX and incident on the incident surface 112 passes through the main body 110 and is emitted from the center of the exit surface 116.

However, the light emitted from the light source 210 in a direction away from the optical axis LX and incident on the incident surface 112 may not be emitted from the exit surface 116 even if it passes through the main body 110. Although the light incident on the incident surface 112 is refracted in a direction approaching the optical axis LX, the refraction is relatively small. Therefore, in order to refract this light on the exit surface 116 parallel to the optical axis LX, the exit surface It is necessary to increase the curvature of 116.

However, as shown in FIG. 6B, when the light of the light source 210 is emitted from a position distant from the optical axis LX in the X direction, the light is incident on the exit surface 116 at a large incident angle. become. In this case, the light is totally reflected by the exit surface 116 and travels in an unintended direction in the main body 110.

On the other hand, as shown in FIG. 6C, when the incident surface 112 is provided with the step 112p, the curvature of the exit surface 116 can be reduced. In this case, the light emitted from the light source 210 on the optical axis LX in a direction away from the optical axis LX is refracted relatively greatly when incident on the incident surface 112 due to the step 112p of the incident surface 112. .. Therefore, the light incident from the incident surface 112 can be emitted in parallel with the optical axis LX even if the curvature of the exit surface 116 is small.

In this case, even if the light of the light source 210 is emitted from a position distant from the optical axis LX, since the curvature of the emission surface 116 is small, the light travels at a relatively small incident angle with respect to the emission surface 116. Light can be emitted to the irradiation surface side. Therefore, as shown in FIG. 6C, it is preferable that the incident surface 112 is provided with a step 112p, and the center of the incident surface 112 protrudes from the outer end portion with respect to the light source 210.

The incident surface 112 of the main body 110 may be flat. Alternatively, the incident surface 112 of the main body 110 may be inclined. However, the outer end of the incident surface 112 of the main body 110 is preferably flat.

Next, the deflection of light by the lens 100 of the present embodiment will be described with reference to FIG. 7. FIG. 7A is a schematic view for explaining light deflection by the lens 100 in which the outer end portion of the incident surface 112 is inclined, and FIG. 7B is a schematic view in which the outer end portion of the incident surface 112 is It is a schematic diagram for demonstrating the deflection of light by a flat lens 100.

As shown in FIG. 7A, when the outer end of the incident surface 112 is inclined, the light directed from the light source 210 to the outer end of the incident surface 112 is refracted when it is incident on the incident surface 112. After that, the light passes through the main body 110, is reflected by the reflecting surface 114, and is emitted from the emitting surface 116.

When the outer end of the incident surface 112 is tilted, the light from the light source 210 is refracted relatively significantly at the incident surface 112. In order to utilize this refracted light, it is necessary to lengthen the reflecting surface 114 in the Z direction. In order to utilize the refracted light having a small inclination with respect to the optical axis LX, the height (length in the Z direction) of the main body 110 is H4.

On the other hand, as shown in FIG. 7B, when the flat portion 112f is provided at the outer end of the incident surface 112, the light from the light source 210 is refracted relatively small on the incident surface 112. Therefore, in order to utilize the refracted light, the reflecting surface 114 may be relatively short. In order to utilize the refracted light having a small inclination with respect to the optical axis LX, the height (length in the Z direction) of the main body 110 is H3.

As can be understood from the comparison between FIGS. 7 (a) and 7 (b), the height H3 of FIG. 7 (b) can be made smaller than the height H4 of FIG. 7 (a). By providing the flat portion 112f at the outer end portion of the incident surface 112 in this way, even if the height (length in the Z direction) of the lens 100 is short, the light incident from the outer end portion of the incident surface 112 is reflected. Can be used.

In the lens 100 shown in FIGS. 1 to 7, the convex lens 116c is provided in the recess, but the present embodiment is not limited to this. The convex lens 116c does not have to be formed in the recess.

Next, the deflection of light by the lens 100 of the present embodiment will be described with reference to FIG. FIG. 8 is a schematic diagram for explaining the deflection of light by the lens 100 of the present embodiment. The lens 100 of FIG. 8 has the same configuration as the lens 100 shown in FIG. 2 except that the convex lens 116c protrudes toward the irradiation surface side with respect to the emission surface 126, thus avoiding redundancy. Therefore, duplicate description is omitted.

As shown in FIG. 8, the convex lens 116c of the exit surface 116 is connected flush with the reflection exit surface 116b and the exit surface 126. As described above, the convex lens 116c may be arranged on the exit surface 116 without providing a recess between the transmission exit surface 116a and the reflection emission surface 116b.

However, as described above with reference to FIGS. 1 to 7, it is preferable that the convex lens 116c is provided with a recess between the transmission exit surface 116a and the reflection emission surface 116b. Since the distance between the incident surface 112 and the convex lens 116c can be shortened by the recess, the absorption and attenuation of light can be suppressed.

As described above, the main body 110 and the outer peripheral 120 of the lens 100 emit light. The intensity of the emitted light may be uneven depending on the position of the lens 100. Therefore, the lens 100 preferably has a diffusion function. For example, a diffusion function may be provided on the incident surface of the lens 100. Alternatively, a diffusion function may be provided on the exit surface of the lens 100.

Next, the lens 100 of the present embodiment will be described with reference to FIG. FIG. 9 is a schematic view of the lens 100 of the present embodiment. The lens 100 of FIG. 9 has the same configuration as the lens 100 shown in FIG. 2 except that the incident surface 112 is provided with the unevenness 112d, and duplicate description is omitted in order to avoid redundancy. ..

As shown in FIG. 9, the lens 100 is provided with an unevenness 112d on the incident surface 112 of the main body 110. In this case, the unevenness 112d is preferably provided at the center of the incident surface 112. Alternatively, the unevenness 112d may be provided on the entire incident surface 112.

The lens 100 shown in FIG. 9 is provided with unevenness 1112d on the incident surface 112 of the main body 110, but the present embodiment is not limited to this. The incident surface 122 of the outer peripheral portion 120 may be provided with irregularities instead of the incident surface 112 of the main body 110. Alternatively, the incident surface 112 of the main body 110 and the incident surface 122 of the outer peripheral portion 120 may be provided with irregularities.

Further, in the lens 100 shown in FIG. 9, the surface of the lens 100 on which the light from the light source 210 is incident is provided with irregularities, but the present embodiment is not limited to this. Concavities and convexities may be provided on the surface of the lens 100 where the light emitted from the light source 210 is emitted instead of the surface on which the light is incident.

Next, the lens 100 of the present embodiment will be described with reference to FIG. 10 (a) and 10 (b) are schematic views of the luminaire lens of the present embodiment. The lens 100 of FIG. 10 has the same configuration as the lens 100 shown in FIG. 2, except that at least one of the exit surface 116, the exit surface 126, and the connecting portion 130 is provided with irregularities. Duplicate description is omitted to avoid redundancy.

As shown in FIG. 10A, the lens 100 is continuously provided with unevenness 116d over the entire surface of the main body 110 on the exit surface 116, the outer peripheral portion 120 on the exit surface 126, and the connecting portion 130 on the irradiation surface side. In this case, the light emitted from the exit surface 116 and the exit surface 126 can be appropriately diffused, and it is possible to suppress the reflection of the shape of the lens 100 on the light emitted to the irradiation surface.

Alternatively, as shown in FIG. 10B, unevenness 116e may be provided on the exit surface 116 of the main body 110, the exit surface 126 of the outer peripheral portion 120, and the irradiation surface side of the connecting portion 130. The unevenness 116e is provided over the irradiation surface of the connecting portion 130 and the vicinity of the connecting portion 130 of the exit surface 116 of the main body 110 and the exit surface 126 of the outer peripheral portion 120. In this case, the light emitted near the boundary between the exit surface 116 and the exit surface 126 can be appropriately diffused, and the shape of the lens 100 can be suppressed from being reflected in the light emitted to the irradiation surface.

Next, the lens 100 of the present embodiment will be described with reference to FIG. FIG. 11 is a schematic view of the lens 100 of the present embodiment. The lens 100 of FIG. 11 has the same configuration as the lens 100 shown in FIG. 2 and is redundant except that the diffuser member 140 is provided so as to face the exit surface 116, the exit surface 126, and the connecting portion 130. Omit duplicate description to avoid.

As shown in FIG. 11, the lens 100 of FIG. 11 further includes a diffusion member 140. Here, the diffusion member 140 is in the form of a sheet. For example, the thickness of the diffusion member 140 is substantially constant.

The diffusion member 140 is arranged so as to face the main body 110, the outer peripheral 120, and the connecting 130. Specifically, the diffusion member 140 is arranged to face the exit surface 116, the exit surface 126, and the connecting portion 130.

By arranging the diffusing member 140 on the exit surface side of the lens 100, the diffusing member 140 diffuses the light even if the intensity of the light emitted from the main body 110, the outer peripheral portion 120 and the connecting portion 130 of the lens 100 is different. As a result, the difference in light intensity can be reduced. As a result, it is possible to irradiate light with reduced intensity unevenness in a specific direction.

In the lens 100 described above with reference to FIGS. 1 to 11, the light from the light source is transmitted through the entire lens 100, but the present embodiment is not limited to this. An installation portion may be provided on the lens 100.

Next, FIG. 12 describes the luminaire lens 100 of the present embodiment. FIG. 12A is a schematic perspective view of the lens 100 of the present embodiment, and FIG. 12B is a schematic cross-sectional view of the lens 100 of the present embodiment. For reference, FIG. 12B also shows the position of the light source 210 installed for the lens 100 together with the optical axis LX of the light source 210.

As shown in FIGS. 12 (a) and 12 (b), the lens 100 further includes an installation portion 150 in addition to the main body portion 110, the outer peripheral portion 120, and the connecting portion 130. Here, the installation portion 150 has a bottom portion 152 and a side portion 154.

The bottom portion 152 is connected to the outer peripheral portion 120 and the outer peripheral portion 120 in the radial direction. The bottom portion 152 is located around the outer peripheral portion 120 and has an annular structure. The bottom portion 152 is connected flush with the exit surface 126 of the outer peripheral portion 120.

The side portion 154 projects from the radial outer end of the bottom portion 152 toward the light source 210. The height of the side portion 154 (length in the Z direction) is larger than the height of the outer peripheral portion 120 (length in the Z direction). The side portion 154 has an annular structure and faces the outer peripheral portion 120.

The lens 100 shown in FIG. 12 is used for a lighting fixture. The lens 100 is preferably installed so as to fit in the container. The lens 100 is suitably used for a luminaire for medium-angle light distribution and / or spot light distribution.

Next, FIG. 13 describes the luminaire 200 provided with the luminaire lens 100 of the present embodiment. FIG. 13 is a schematic exploded perspective view of the luminaire 200 including the luminaire lens 100 of the present embodiment.

As shown in FIG. 13, the luminaire 200 includes a lens 100, a light source 210, an arm 220, a frame 230, and a reflecting member 240. Here, the frame body 230 and the reflective member 240 are integrally formed. The lens 100 of FIG. 13 has the same configuration as the lens 100 shown in FIG. 12, except that the side portion 154 is provided with the through hole 154a and the through hole 154b.

The light source 210 emits light. The arm 220 holds the light source 210. Here, the arm 220 holds the light source 210 so that the light source 210 faces the −Z direction. The arm 220 is fixed to the side surface of the frame 230.

For example, the arm 220 is formed of an elongated plate-like member. The arm 220 is located on the side of the light source 210 in the Y direction and above in the Z direction. Both ends of the arm 220 communicate with the frame 230. For example, the arm 220 is formed by bending a plate-shaped member.

The lens 100 is arranged inside the frame 230. For example, the frame 230 is made of resin. The frame body 230 is provided with through holes 234a and 234b. The center of the through hole of the frame body 230 is parallel to the optical axis of the light source 210. The frame body 230 has a substantially tubular shape provided with a through hole. For example, the frame 230 has a substantially cylindrical shape. The outer diameter of the frame 230 is larger than the outer diameter of the light source 210.

The lens 100 and the frame 230 support the arm 220. The frame 230 is provided with an opening. The light emitted from the light source 210 passes through the opening of the frame 230 after passing through the lens 100.

In the luminaire 200, the frame 230 is arranged outside the lens 100. The inner diameter of the frame 230 is larger than the outer diameter of the side portion 154 of the lens 100. The inner diameter of the frame 230 may be larger than the outer diameter of the side portion 154 of the lens 100, or may be substantially equal to the outer diameter of the lens 100.

As described above, the arm 220 holds the light source 210. A socket 210s is attached to the arm 220. The light source 210 is attached to the socket 210s of the arm 220.

The socket 210s is fixed to the arm 220 by the fixing member 210t. The fixing member 210t includes screws or rivets. Alternatively, the fixing member 210t may include bolts and nuts.

The reflecting member 240 suppresses the light emitted from the light source 210 in the −Z direction from returning toward the light source 210. The reflective member 240 is provided with an opening. The center of the opening of the reflective member 240 is located on the optical axis of the light source 210.

For example, the reflective member 240 is made of resin. In order to efficiently reflect the light emitted from the light source 210, it is preferable that at least the inner surface of the reflecting member 240 is reflected. Reflective processing includes, for example, white coating, silver coating, or glossy metal plating. Alternatively, the color of the reflecting member 240 may be a color having a high light reflectance such as white or silver. Further, the reflective member 240 may be formed of metal.

The reflective member 240 includes a tubular portion 242 and a flange portion 244. The tubular portion 242 is provided with an opening. The center of the opening of the tubular portion 242 coincides with the optical axis of the light source 210. The diameter of the inner peripheral surface of the tubular portion 242 gradually increases as the distance from the light source 210 increases. For example, the tubular portion 242 has a substantially truncated cone shape.

The flange portion 244 surrounds the periphery of the lower end (end portion on the −Z direction side) of the tubular portion 242. For example, the flange portion 244 is connected to the tubular portion 242 and extends radially outward from the tubular portion 242.

The reflective member 240 may be connected to the frame 230. Here, the reflective member 240 is provided integrally with the frame body 230.

Further, it is preferable that the luminaire 200 further includes a cover member 250. The cover member 250 is connected to the arm 220. The cover member 250 covers the side portion of the light source 210 on the −X direction side. The cover member 250 has a semicircular shape when viewed in a plan view along the Z-axis direction.

As described above, the frame 230 supports the arm 220. The arm 220 is fixed to the side surface of the frame 230. The fixing portion 230a fixes the arm 220 to the side surface of the frame body 230.

Here, the arm 220 is fixed to the outer peripheral surface of the frame 230. In this case, the fixing portion 230a fixes the arm 220 to the outer peripheral surface of the frame 230 with a part of the arm 220 in contact with the outer peripheral surface of the frame 230.

For example, the fixing portion 230a includes a bolt 230b and a nut 230c. The arm 220 is fixed to the frame 230 by the nut 230c tightening the bolt 230b.

When the frame 230 is arranged outside the lens 100, the arm 220 is fixed to the lens 100 and the frame 230. The fixing portion 230a may fix the frame body 230 and the lens 100. In this case, the fixing portion 230a fixes the arm 220, the frame body 230, and the lens 100.

Through holes 234a and 234b are provided on the side portion of the frame body 230, and through holes 154a and 154b are provided on the side portion 154 of the lens 100. The size of the through holes 234a and 234b of the frame body 230 and the through holes 154a and 154b of the lens 100 are substantially the same. The through holes 234a and 234b of the frame body 230 are aligned with the through holes 154a and 154b of the lens 100, and the through holes of the arm 220 are further aligned with the through holes 234a and 234b of the frame body 230 and the through holes of the lens 100. The arm 220, the frame 230, and the lens 100 are aligned so as to match 154a and 154b. In this state, the bolt 230b is inserted into the through hole of the arm 220, the through hole 234a and 234b of the frame body 230 and the through hole 154a and 154b of the lens 100 to fix the arm 220 to the side surface of the frame body 230 and the lens 100. ..

The arm 220 is preferably rotatable with respect to the frame 230. Here, the arm 220 is rotatable in the X direction with respect to the frame 230. The arm 220 can rotate with respect to the frame 230 until the optical axis of the light source 210 is not parallel to the Z direction.

As described above, the fixing portion 230a fixes the arm 220 and the frame body 230. The arm 220 can rotate about the fixed portion 230a with respect to the frame body 230 in the + X direction. When the fixing portion 230a is the center of rotation of the arm 220, the fixing portion 230a preferably includes a bolt and a nut.

As described above, the cover member 250 covers the side of the light source 210 on the −X direction side. On the other hand, the cover member 250 is not provided on the side of the light source 210 on the + X direction side. Therefore, the arm 220 can rotate with respect to the frame body 230 without colliding with the cover member 250.

For example, the lighting fixture 200 is manufactured as follows. First, the light source 210 and the cover member 250 are attached to the arm 220. Further, the lens 100 is installed on the frame body 230. Here, the lens 100 is fitted inside the frame 230.

Next, the arm 220 is attached to the frame body 230, and the fixing portion 230a fixes the arm 220 to the side surface of the frame body 230. For example, the arm 220 is aligned with the lens 100 and the frame 230 so that the through holes of the arm 220 overlap the through holes 234a and 234b of the frame 230 and the through holes 154a and 154b of the lens 100. After that, the bolt 230b is inserted into the through hole of the arm 220 and the through hole of the frame body 230, and the nut 230c is tightened to the bolt 230b to fix the arm 220 to the side surface of the frame body 230 and the lens 100.

The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be implemented as an embodiment in various embodiments without departing from the gist thereof. In addition, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be removed from all the components shown in the embodiments. In order to make the drawings easier to understand, each component is schematically shown, and the number of each component shown may differ from the actual one due to the convenience of drawing. Further, each component shown in the above embodiment is an example and is not particularly limited, and various modifications can be made without substantially deviating from the effect of the present invention.

For example, in the lens 100 shown in FIGS. 1 to 13, the main body 110 and the outer peripheral portion 120 are connected to each other via the connecting portion 130, and the connecting portion 130 has a positional relationship between the main body portion 110 and the outer peripheral portion 120. However, the present embodiment is not limited to this. The main body 110 and the outer peripheral 120 may be positioned without being connected to the connecting 130. For example, the frame 230 shown in FIG. 13 may be provided with a convex portion or a concave portion so that the main body portion 110 and the outer peripheral portion 120 of the lens 100 are placed at predetermined positions, respectively.

The present invention is useful for luminaire lenses and luminaires.

100 Lens for lighting equipment 110 Main body 120 Outer circumference 130 Connecting

Claims (11)

A lens for lighting equipment that transmits light emitted from a light source toward the optical axis.
With the main body
An outer peripheral portion arranged around the main body portion and
A connecting portion for connecting the main body portion and the outer peripheral portion is provided.
The main body portion has an inner incident surface, an inner reflecting surface, and an inner emitting surface provided with a convex lens.
The inner reflecting surface reflects light incident from the inner incident surface,
The outer peripheral portion has an outer incident surface, an outer reflecting surface, and an outer emitting surface.
The outer reflecting surface is a lens for a luminaire that reflects light incident from the outer incident surface. The inner reflecting surface is configured to totally reflect the light incident from the inner incident surface.
The lens for a luminaire according to claim 1, wherein the outer reflecting surface is configured to totally reflect light incident from the outer incident surface. The lens for a luminaire according to claim 1 or 2, wherein the inclination of the inner reflecting surface with respect to the optical axis is larger than the inclination of the outer reflecting surface with respect to the optical axis. The luminaire lens according to any one of claims 1 to 3, wherein the inclination of the inner incident surface with respect to the optical axis is 90 ° or less at an arbitrary point on the inner incident surface. The lens for a luminaire according to any one of claims 1 to 4, wherein a step is provided on the inner incident surface. The luminaire lens according to any one of claims 1 to 5, wherein the center of the inner incident surface protrudes from the end of the inner incident surface with respect to the light source. The lens for a luminaire according to any one of claims 1 to 6, wherein the outer end portion of the inner incident surface extends in a direction orthogonal to the optical axis. The inner exit surface is recessed with respect to the outer exit surface.
The lens for a lighting fixture according to any one of claims 1 to 7, wherein the convex lens is provided on the inner emitting surface. The lens for a luminaire according to any one of claims 1 to 8, wherein an unevenness is provided in the center of the inner incident surface. The lens for a luminaire according to any one of claims 1 to 9, further comprising a diffusing member that diffuses light emitted from the light source and transmitted through any of the main body portion, the outer peripheral portion, and the connecting portion. The lens for a luminaire according to any one of claims 1 to 10.
A luminaire comprising a light source that emits light toward the luminaire lens.

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