JP2011175874A - Lighting fixture and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of relieving color tone unevenness while achieving compactness of an optical lens in a lighting device. <P>SOLUTION: In a lighting fixture 1 having a light source 2 for emitting white light and the optical lens 3 arranged to cover a light-emitting surface from the front, the optical lens 3 has: a first incident surface 31 arranged in the vicinity of the first incident surface including a light source optical axis extending from the light-emitting surface and being parallel light along the light source optical axis by refracting light from the light source 2 being incident to the optical lens 3; a second incident surface 32 arranged in the circumference of the first incident surface 31 and having a surface nearly along the optical axis; a total reflecting surface 33 arranged outside the second incident surface 32 and being parallel light advancing toward an opposite side of the first incident surface 31 by internally reflecting light incident from the second incident surface 32; and an emitting surface which is a surface arranged at an opposite side of the first incident surface 31, wherein a lens cut 34a having an uneven curved cross-section viewed from a plane perpendicular to the optical axis is applied so as to arrange its edge line at a front-viewed lattice shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination lamp using a light-emitting diode as a light source and an illumination apparatus configured by using a plurality of the illumination lamps.

  In recent years, a general lighting device (hereinafter also referred to as a white LED lighting device) using a light emitting diode (hereinafter also referred to as an LED (Light Emitting Diode)) as a light source has been widely used.

  A light-emitting diode cannot obtain white light including a plurality of wavelengths from the element itself due to its properties. For this reason, in the case of a white light emitting diode, white light is obtained by a method such as using a phosphor that is a wavelength converting substance.

  A white light emitting diode that obtains white light using a phosphor emits blue light (for example, composed of a semiconductor material such as ZnSe-based, InGaN-based, GaN-based, or ZnO-based), and blue light that is blue Irradiates light to a phosphor (for example, YAG, TAG, orthosilicate system, etc.) that converts the wavelength into yellow light or yellow-green light, which is a complementary color. Then, the phosphor is excited by blue light, and yellow light having a wavelength longer than that of the excitation light can be obtained. That is, the white light emitting diode generates pseudo white light by the additive color mixture of the yellow light and the blue light inherent to the blue light emitting diode.

  By the way, in a white light emitting diode that obtains pseudo white light using a phosphor, an LED chip that emits the original color (blue light) of the light emitting diode and a light emitting surface (surface exposed to the outside) that has passed through the phosphor. Since the distance (optical path length) is not uniform, a difference in light emission color tone (so-called color tone unevenness or color unevenness) may occur.

  In addition, as an example of the white LED lighting device that attempts to solve the problem of uneven color tone as described above, a convex light incident surface having a convex surface and a central portion and an outer peripheral portion are formed with different shapes or different curvatures. With an optical lens having a convex light emitting surface, bluish white light emitted from the central portion of the light emitting surface of the LED and yellowish white light emitted from the peripheral portion of the light emitting surface of the LED, respectively. Among them, a technique is known in which each white light introduced into the lens from the convex surface on the light incident surface side of the optical lens is emitted to the outside from the convex portion on the light emitting surface side and mixed (for example, Patent Document 1).

JP 2007-142178 A

However, in the technique of Patent Document 1 described above, since the optical path of white light with bluish light and white light with yellowish color is mixed in the optical lens to reduce the color tone unevenness, the light irradiation direction length of the optical lens is long. As a result, the optical lens became thick.
In other words, there has been a problem that it is difficult to reduce the size of the lighting device that eliminates color tone unevenness because the optical lens becomes thick.

  Further, since the optical lens becomes thick, a large amount of raw materials are required for manufacturing the lens, or sink marks are likely to occur during molding, which may cause a cost increase.

  As described above, the present invention provides a technique for alleviating color tone unevenness while reducing the size of a device configuration in a lighting device using a white light emitting diode that emits white light as a light source using a blue light emitting diode and a yellow phosphor. Let's take the problem to solve.

In view of the above problems, the present invention has the following means.
That is, the present invention includes a light-emitting chip that emits blue light, and a light-emitting diode that includes a yellow phosphor layer that covers the light-emitting chip from the emission direction, and that emits white light with a surface outside the yellow phosphor layer as a light-emitting surface; And an optical lens disposed so as to cover the light emitting surface from the front, and the optical lens is provided in the vicinity including the optical axis of the light emitting diode extending from the light emitting surface and is incident on the optical lens. A first incident surface that refracts light from the light to make parallel light along the light-emitting diode optical axis, a second incident surface that is provided around the first incident surface and has a surface substantially along the optical axis, Provided on the outside of the two incident surfaces, the total reflection surface that reflects the light incident from the second incident surface to the inner surface and is directed to the opposite side of the first incident surface, and the opposite side of the first incident surface It is a surface to be installed and perpendicular to the optical axis The lens cut forming an uneven curved slice as viewed from the plane, and an exit surface which has been subjected to its ridge line in the front view grid pattern is disposed.

  In the present invention, a white light emitting diode that emits white light is used as a light source. Here, the white light emitting diode generates pseudo white light by mixing the blue light from the blue light emitting chip and the yellow light excited by the yellow phosphor layer provided on the blue light emitting chip. Therefore, the light from the white light emitting diode has a distance from the blue light emitting chip to the light emitting surface (passing distance of the yellow phosphor layer) that is different in surface area between the blue light emitting chip and the light emitting surface (exposed surface of the phosphor layer). Due to the difference in the optical path length), light of various colors is generated.

  Therefore, in the present invention, all the light emitted from the white light emitting diode in various directions is adjusted to parallel light with respect to the optical axis by the optical lens. And this invention diffuses the light which has various color tones when this parallel light is radiate | emitted outside the optical lens by the lens cut provided in the output surface of the optical lens. That is, in the present invention, in order to alleviate the color tone unevenness (difference in color tone) of the light from the white light emitting diode, the optical path of the light having various color tones is not exchanged inside the optical lens, but the light exits from the optical lens. The incident light is diffused vertically and horizontally in front view of the exit surface. With this configuration, the thickness of the optical lens can be reduced as compared with the case where the color tone unevenness is reduced in the optical lens.

  Therefore, according to the present invention, in an illuminating device using a white light emitting diode that emits white light using a blue light emitting diode and a yellow phosphor as a light source, a technique for reducing color unevenness while reducing the size of the optical lens is provided. can do.

  The present invention also includes a light emitting chip that emits blue light, and a light emitting diode that includes a yellow phosphor layer that covers the light emitting chip from an emission direction, and that emits white light with a surface outside the yellow phosphor layer as a light emitting surface; And an optical lens arranged so as to cover the light emitting surface from the front, and the optical lens is provided in the vicinity thereof including the light-emitting diode optical axis extending from the light emitting surface. A first incident surface that refracts light from the light emitting diode incident on the light to make parallel light along the optical axis of the light emitting diode, and a second surface that is provided around the first incident surface and has a surface substantially along the optical axis. An incident surface, a total reflection surface that is provided outside the second incident surface, reflects the light incident from the second incident surface to the inner surface, and makes parallel light toward the opposite side of the first incident surface; and the first incident On the opposite side of the surface A lens cut having a concave-convex curved section when viewed from a plane perpendicular to the optical axis, and an exit surface that is arranged so that the ridgeline is arranged in a front view lattice shape. The ridge lines are arranged so as to be different from each other by a predetermined angle when viewed from the front.

  The above configuration is another aspect of the present invention. That is, the above configuration is an aspect in the case of using as a lighting device using a plurality of the above-mentioned illumination lamps, and by setting the ridgelines of the lens cut to different angles from each other when viewed from the front, color unevenness due to individual illumination lamps is mutually Can be relaxed.

The plurality of illumination lamps may be arranged in a circular shape when viewed from the front, and the ridge line of the lens cut may be arranged so as to be different by a certain angle in the circumferential direction with respect to one of the plurality of illumination lamps. Good.
Further, in the present invention, the certain angle may be determined in correspondence with the number of the plurality of illumination lamps arranged.

  The above two configurations are more preferable configurations for alleviating uneven color tone when a lighting device is configured by combining a plurality of illumination lamps. By adopting such a configuration, in the present invention, the positional relationship between the plurality of illumination lamps and other illumination lamps adjacent to each other is arranged such that light emitted from each illumination lamp is directed in different directions. Therefore, the diffused light from the individual illumination lamps can be mixed and the color unevenness of the individual illumination lamps can be alleviated.

  As described above, according to the present invention, in an illuminating device using a white light emitting diode that emits white light using a blue light emitting diode and a yellow phosphor as a light source, color unevenness is reduced while miniaturizing an optical lens. Technology can be provided.

It is a perspective view of the illumination lamp which concerns on one embodiment of this invention. It is a sectional side view of the illuminating lamp which concerns on this embodiment. It is a top view of the illuminating lamp according to the present embodiment. It is a figure which shows the lens cut shape of the optical lens of the illumination lamp which concerns on this embodiment, and the emitted light from an optical lens. In the illumination lamp which concerns on this embodiment, it is a figure explaining the principle which color tone nonuniformity produces in the emitted light from a white light emitting diode. It is a disassembled perspective view of the illuminating device which concerns on this embodiment. It is a top view of the illuminating device which concerns on this embodiment.

Hereinafter, with respect to an illuminating lamp according to an embodiment of the present invention and an illuminating apparatus configured by using a plurality of the illuminating lamps, the illuminating lamp will be described in Example 1 and the illuminating apparatus will be described in Example 2.
In addition, since this Embodiment is only one Embodiment of this invention, it cannot be overemphasized that other Embodiment is also included in this invention.

[Example 1]
FIG. 1 is a perspective view of an illuminating lamp 1 according to the present embodiment. FIG. 2 is a side sectional view of the illumination lamp according to the present embodiment. FIG. 3 is a top view of the illumination lamp according to the present embodiment.
The illumination lamp 1 according to the present embodiment includes a white light emitting diode 2 and an optical lens 3.
Here, in the present embodiment including Examples 1 and 2, the direction facing the light irradiation direction of the white light emitting diode 2 is defined as an upper surface (front surface), and a vertical surface therefrom is defined as a side surface.

As shown in FIGS. 1 and 2, the optical lens 3 is disposed so as to cover the light emitting surface 2 a of the white light emitting diode 2 from the front (facing the light irradiation direction) in the illumination lamp 1. The optical lens 3 is provided around its vicinity including the light-emitting diode optical axis X extending from the light-emitting surface 2a.
In the present embodiment, the optical lens 3 has a circular shape in a top view as shown in FIG. 3, and includes a first incident surface 31, a second incident surface 32, a total reflection surface 33, and an exit surface 34.

  The first incident surface 31 is provided in a region centered on the light-emitting diode optical axis X, refracts the incident light from the white light-emitting diode 2, and causes the light to travel along the light-emitting diode optical axis X inside the optical lens 3. It has a convex surface that can be parallel light.

  The second incident surface 32 is provided around the first incident surface 31 (outside as viewed from above), and light that has not entered the first incident surface 31 out of the light from the light emitting diode 2 is incident on the inside of the optical lens 3. In order to be able to do so, it has a surface (substantially vertical surface) extending in a direction substantially along the light-emitting diode optical axis X.

  The total reflection surface 33 is provided outward as viewed from the light-emitting diode optical axis X of the second incident surface 32. The total reflection surface 33 causes the light incident from the second incident surface 32 to be internally reflected to be parallel light directed to the opposite side of the first incident surface 31.

  The exit surface 34 is provided on the opposite side of the first entrance surface, and is based on a surface perpendicular to the light-emitting diode optical axis X. FIG. 4 is a diagram showing the lens cut shape of the optical lens of the illumination lamp according to the present embodiment and the emitted light from the optical lens.

  As shown in FIG. 4, the exit surface 34 is provided with a lens cut 34a having an uneven curved cross section (a cross-sectional shape that strikes a wave) when viewed from a plane perpendicular to the optical axis. As shown in FIG. 3, the lens cut 34a is applied such that the ridges are arranged in a lattice shape in a front view.

The effect | action is demonstrated about the illumination lamp 1 of this embodiment which makes the above structures.
FIG. 5 is a diagram for explaining the principle of occurrence of uneven color tone in the emitted light from the white light emitting diode 2 in the illumination lamp 1 according to the present embodiment.

  As shown in FIG. 5, the white light emitting diode 2 used in the illumination lamp 1 includes a light emitting chip (light emitting element) 21 that emits blue light and a yellow phosphor layer 22 that covers the light emitting chip 21. With this configuration, the white light emitting diode 2 emits blue light when the light emitting chip 21 is fed, and the yellow light generated by exciting the yellow phosphor layer 22 by the blue light mixes with the original blue light to generate white light. Irradiate light.

  At this time, since the distance (optical path length) from the light emitting chip 21 to the light emitting surface 23 (not shown) varies depending on the direction of light, relatively light blue light L3 is irradiated at a portion where the optical path length is short, and the optical path length is long. A relatively yellow light L4 is radiated at the place.

  And when using such a white light emitting diode 2 as a light source of the illumination lamp 1, in order to relieve the uneven color tone of the irradiated light (a state where light such as pale light or yellow light is mixed in the irradiated light), the first incident surface After the light having various color tones is adjusted to parallel light by the first incident surface 32, the second incident surface 32, and the total reflection surface 33, the light is diffused by the lens cut 34a in various directions such as L1 and L2 shown in FIG. The

  With the above configuration and operation, the illumination lamp 1 according to the first embodiment diffuses and mixes light of various color tones that are parallel light inside the lens by the lens cut 34a, and thus the configuration of the device (optical lens 3) is small. Color tone unevenness can be alleviated while making it easier.

[Example 2]
In Example 2, an illuminating device 10 configured by combining a plurality of illumination lamps 1 in Example 1 will be described. In addition, since the illuminating device 10 employ | adopts the above structures, description is abbreviate | omitted about the structure of each illumination lamp.

  FIG. 6 is an exploded perspective view of the lighting device according to the present embodiment. FIG. 7 is a top view of the lighting device according to the present embodiment.

  As shown in FIG. 6, the illumination device 10 includes a base assembly 11, a plurality of white light emitting diodes 12 (six in this embodiment), and a lens assembly having a number of optical lenses 13 corresponding to the plurality of white light emitting diodes 12. 14 and.

  The base 11 is mounted with a white light emitting diode 12 and is coupled to the lens assembly 14 by a coupling member (not shown) such as a screw. The base portion 11 maintains the optical position of the white light emitting diode 12 and the optical lens 13 of the lens assembly 14 in a desired state.

  The lens assembly 14 includes the above-described optical lens 13 and an outer peripheral portion 14 a that surrounds each optical lens 13 and defines the outer shape of the lens assembly 14.

  In the present invention, the lens assembly 14 may be formed by combining the optical lens 13 and the outer peripheral portion 14a integrally, for example, by resin molding as in the present embodiment, or after being formed separately. Good.

The optical lens 13 has the same configuration as the optical lens 3 of Example 1, that is, a first incident surface, a second incident surface, a total reflection surface, and an output surface. Here, since the details of the configuration of the optical lens 13 are the same as those in the first embodiment, the description thereof is omitted.
Next, the arrangement of the optical lens 13 in the lens assembly 14 will be described with reference to FIG.

  As shown in FIG. 7, the optical lens 13 has a circular shape when viewed from the front (as viewed from the direction facing the irradiation direction of the illumination device 10) (the locus connecting the center and the outer periphery of each optical lens 13 forms a circle). To).

  Here, the optical lenses 13 of the lens assembly 14 are arranged such that the ridgelines of the lens cuts of other adjacent optical lenses are different from each other by a predetermined angle when viewed from the front. That is, when the optical lens 13a is used as a reference, the lens cut 34aa of the optical lens 13a differs from the lens cuts 34ab and 34af of the optical lens 13b and optical lens 13f adjacent to the lens cut 34aa (the edge line of the lens cut of the adjacent optical lens 13). When looking at each other, it is understood that they are arranged at a predetermined angle).

  Here, the angle is determined according to the number of the plurality of optical lenses 13 arranged. For example, the lens cuts in the present embodiment are arranged in a vertical and horizontal lattice shape (with an angle of 90 degrees in the vertical and horizontal directions) as described in the first embodiment. For this reason, if the ridge lines of the lens cuts of the adjacent optical lenses 13 are arranged in different directions by 15 degrees, the directions of the adjacent optical lenses 13 are set at a certain angle with respect to the optical lens 13 of one illumination device 10. Can be different.

  With the above configuration, the illumination device 10 is irradiated from the combination adjacent to the light beam emitted from the combination of the individual white light emitting diodes 12 and the corresponding optical lens 13 (corresponding to the plurality of illumination lamps 1). Light rays will be mixed with each other. Therefore, the illuminating device 10 can relieve | moderate the color tone nonuniformity of the white light irradiated from each white light emitting diode 12 more effectively in the whole apparatus.

DESCRIPTION OF SYMBOLS 1 Illumination lamp 2 White light emitting diode 21 Light emitting chip 22 Yellow fluorescent substance layer 3 Optical lens 31 1st incident surface 32 2nd incident surface 33 Total reflection surface 34 Outgoing surface 34a Lens cut 10 Illumination device 11 Base part 12 White light emitting diode 13 Optical Lens 14 Lens assembly 14a Outer periphery

Claims (4)

A light-emitting chip that emits blue light, and a yellow phosphor layer that covers the light-emitting chip from an emission direction, and a light-emitting diode that emits white light with a surface outside the yellow phosphor layer as a light-emitting surface;
And an optical lens arranged so as to cover the light emitting surface from the front,
The optical lens is
A first incident surface provided near the light emitting diode optical axis extending from the light emitting surface, and refracting light from the light emitting diode incident on the optical lens to be parallel light along the light emitting diode optical axis; ,
A second incident surface provided around the first incident surface and having a surface substantially along the optical axis;
A total reflection surface provided on the outside of the second incident surface, and internally reflecting the light incident from the second incident surface to be parallel light directed to the opposite side of the first incident surface;
An exit that is provided on the opposite side of the first entrance surface and has a lens cut having an uneven curved section when viewed from a plane perpendicular to the optical axis so that the ridges are arranged in a lattice shape in a front view. An illumination lamp having a surface. A light emitting chip that emits blue light, and a yellow phosphor layer that covers the previous light emitting chip from the emitting direction, and a light emitting diode that emits white light with the outer surface of the yellow phosphor layer as a light emitting surface;
An illumination device that uses a plurality of illumination lamps comprising an optical lens disposed so as to cover the light emitting surface from the front,
The optical lens is
A first incident surface provided near the light emitting diode optical axis extending from the light emitting surface, and refracting light from the light emitting diode incident on the optical lens to be parallel light along the light emitting diode optical axis; ,
A second incident surface provided around the first incident surface and having a surface substantially along the optical axis;
A total reflection surface provided on the outside of the second incident surface, and internally reflecting the light incident from the second incident surface to be parallel light directed to the opposite side of the first incident surface;
An exit that is provided on the opposite side of the first entrance surface and has a lens cut having an uneven curved section when viewed from a plane perpendicular to the optical axis so that the ridges are arranged in a lattice shape in a front view. And having a surface,
An illuminating device arranged such that ridge lines of lens cuts of adjacent illumination lamps are different from each other by a predetermined angle when viewed from the front. The plurality of illumination lamps are arranged in a circular shape when viewed from the front,
The lighting device according to claim 2, wherein the ridge line of the lens cut is arranged so as to be different by a certain angle in the circumferential direction with reference to one of the plurality of illumination lamps.   The lighting device according to claim 3, wherein the certain angle is determined according to the number of the plurality of illumination lamps arranged.

Images