JP2015173053A - Luminaire, light-emitting module, and medical treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress illuminance irregularity of an irradiation field from a luminaire.SOLUTION: A luminaire includes: a COB 21 where a plurality of light-emitting chips 210 respectively emitting light is arranged on a circuit board; and a reflector where a plurality of reflection surfaces respectively extending in a Y direction and reflecting light from the light-emitting chips forms a predetermined angle and is aligned in an X direction to thereby form a recess surface, and each reflection surface is opposite to the COB 21. In the COB 21, one light-emitting chip 210a out of the plurality of light-emitting chips 210 and another light-emitting chip 210b adjacent to the one light-emitting chip 210a in the X direction are arranged so as to be deviated in the Y direction.

Description

  The present invention relates to a lighting device, a light emitting module, and a medical device.

As an illuminating device used for medical treatment such as dentistry, there is an illuminating device having an LED (light emitting diode) and a reflecting mirror (reflector) that is disposed facing the LED and reflects light from the LED (see Patent Document 1). .
In such an illuminating device, the light beam from the LED is reflected by the concave reflecting surface formed on the reflecting mirror, so that light is irradiated to a predetermined irradiation range.

JP 2011-108575 A

By the way, in the illuminating device that reflects and irradiates the light of the LED with the reflector, uneven illuminance and uneven color tone are generated in the irradiation field irradiated with light by the illuminating device due to the difference in the shape of the reflecting surface of the reflector and the arrangement of the LED. May occur. When uneven illuminance or uneven color tone occurs in the irradiation field, it becomes difficult to identify a fine color difference required for medical treatment such as dentistry, which may hinder medical treatment.
An object of the present invention is to suppress uneven illuminance of an irradiation field by a lighting device.

For this purpose, the illumination device to which the present invention is applied includes a light source in which a plurality of light emitting chips each emitting light is arranged on a substrate, and a plurality of light sources each extending in the vertical direction and reflecting light from the light emitting chips. The reflecting surfaces are arranged in a horizontal direction at a predetermined angle to form concave surfaces, each reflecting surface including a reflector facing the light source, and the light source emits light of one of the plurality of light emitting chips. The chip and another light emitting chip adjacent in the horizontal direction with respect to the one light emitting chip are arranged so as to be shifted in the vertical direction.
Here, the light source may be characterized in that an arrangement direction of the plurality of light emitting chips is inclined with respect to the lateral direction. Thereby, it is suppressed that the stripe | line which extends in a horizontal direction arises in an irradiation field.
The light source may be characterized in that a region where the light emitting chip does not exist on the substrate is not continuously formed in the lateral direction. Thereby, it is suppressed that the stripe | line which extends in a horizontal direction arises in an irradiation field.
Further, the light source may include a light diffusion layer that is stacked on the plurality of light emitting chips and diffuses light emitted from the plurality of light emitting chips. Thereby, the illumination intensity nonuniformity and color tone nonuniformity in an irradiation field are suppressed more.
From another point of view, the light emitting module to which the present invention is applied is a reflective surface of a reflector in which a plurality of reflective surfaces each extending in the vertical direction are arranged in a horizontal direction at a predetermined angle to form a concave surface. The light emitting module is used in opposition to a substrate, and includes a substrate and a plurality of light emitting chips each emitting light and disposed on the substrate, wherein the plurality of light emitting chips includes one light emitting chip and the one light emitting chip. The other light emitting chip adjacent to the light emitting chip in the horizontal direction is arranged so as to be shifted in the vertical direction.
Here, the light-emitting module covers the plurality of light-emitting chips together, a phosphor layer that emits fluorescence by light from the plurality of light-emitting chips, and is stacked on the phosphor layer and is emitted from the plurality of light-emitting chips. And a light diffusion layer for diffusing the emitted light and the fluorescence generated in the phosphor layer. Thereby, the illumination intensity nonuniformity and color tone nonuniformity in an irradiation field are suppressed more.
From another point of view, a medical device to which the present invention is applied includes a medical device used for medical treatment and a lighting device that irradiates a medical site by the medical device, and each of the lighting devices includes: A light source in which a plurality of light emitting chips emitting light are arranged on a substrate, and a plurality of reflecting surfaces each extending in the vertical direction and reflecting light from the light emitting chips are arranged in a horizontal direction at a predetermined angle, thereby forming a concave surface. Each of the reflecting surfaces is formed opposite to the light source, and the light source of the lighting device includes one light emitting chip of the plurality of light emitting chips and the lateral direction with respect to the one light emitting chip. The other light emitting chip adjacent to is arranged so as to be shifted in the vertical direction.

  According to the present invention, it is possible to suppress illuminance unevenness of an irradiation field by an illumination device.

It is the perspective view which showed the whole structure of the dental treatment apparatus with which this embodiment is applied. It is the perspective view which showed the structure of the illuminating device to which this embodiment is applied. It is the perspective view which showed the structure of the light emitting module and support member of this embodiment. (A)-(c) is the figure which showed the structure of the light emitting module of this embodiment. (A)-(c) is the figure which showed the structure of the reflector to which this embodiment is applied. (A)-(b) is a figure for demonstrating the optical path of the light irradiated with the illuminating device of this embodiment. It is the figure which showed an example of arrangement | positioning of the light emitting chip in COB to which this embodiment is applied. It is the figure which showed an example of the irradiation area | region (irradiation field) in the illuminating device of this embodiment. (A)-(b) is the figure shown about the other example of arrangement | positioning of the light emitting chip in COB. (A)-(b) is a figure for demonstrating the subject in the conventional illuminating device.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(Dental medical device 1)
FIG. 1 is a perspective view showing an overall configuration of a dental medical apparatus 1 to which the present embodiment is applied.
As shown in the figure, a dental medical device 1 of this embodiment is an example of a medical device, and a medical table 2 is provided on a floor surface. Further, in the dental medical device 1 of the present embodiment, a doctor tray table 3 is provided beside the medical table 2 and a doctor instrument holder 4 on which medical instruments are installed is provided. Yes. Furthermore, in this embodiment, an instrument holder 5 for an assistant is provided on the opposite side of the tray table 3 with the medical table 2 interposed therebetween. Further, in the dental medical device 1 of the present embodiment, a supply device (spitton device) 7 for supplying water to the cup used when the patient gargles is provided beside the medical table 2. Furthermore, the dental medical device 1 of the present embodiment is provided with an illumination device 10 that illuminates a patient's medical site and the like during medical treatment, and a column 6 that supports the illumination device 10.

(Lighting device 10)
Then, the structure of the illuminating device 10 is demonstrated. FIG. 2 is a perspective view showing the configuration of the illumination device 10 to which the present embodiment is applied.
The illuminating device 10 of the present embodiment includes a light emitting module 20 (see FIG. 3 described later) that is an example of a light source, a support member 30 that supports the light emitting module 20, and a reflector 40 that reflects light emitted from the light emitting module 20. And. Furthermore, the illuminating device 10 of this embodiment is provided with the housing | casing 50 which supports the supporting member 30 and the reflector 40, and the cover member 60 which covers the front side (side where light is radiate | emitted) of the housing | casing 50. FIG. Furthermore, the illuminating device 10 of the present embodiment includes a handle 70 that is attached to the outside of the housing 50 and is used when adjusting the position of the illuminating device 10.
Note that the light emitting module 20 is supported on the side of the support member 30 facing the reflector 40, and is hidden by the support member 30 in FIG.

The cover member 60 is configured by a member having transparency to light emitted from the light emitting module 20.
The lighting device 10 according to the present embodiment has a structure in which the inside of the lighting device 10 is sealed by a housing 50 and a cover member 60. Thereby, it is suppressed that the water droplet, dust, etc. which are scattered at the time of medical treatment adhere to the surface of the light emitting module 20 or the reflector 40. And the fall of the illumination intensity of the illuminating device 10 by adhesion | attachment of a water drop, dust, etc. can be suppressed, and the effort of the cleaning of the illuminating device 10 can be reduced.

FIG. 3 is a perspective view showing the configuration of the light emitting module 20 and the support member 30 of the present embodiment. FIG. 3 corresponds to a view of the light emitting module 20 and the support member 30 as viewed from the reflector 40 (see FIG. 2) side.
As shown in FIG. 3, the support member 30 of the present embodiment supports the light emitting module 20 and dissipates heat generated in the light emitting module 20, and a casing 50 ( 2), and two attachment portions 32 to be attached.

In the present embodiment, the light emitting module 20 is attached to the heat radiating portion 31 of the support member 30 so that the light emission direction of the light emitting module 20 faces the reflector 40 side. And in the illuminating device 10 of this embodiment, the light emission module 20 supported by the thermal radiation part 31 of the support member 30 is attached to the housing | casing 50 by attaching the attachment part 32 of the support member 30 to the center part of the reflector 40. It comes to face. As a result, the COB 21 (see FIG. 4 described later) of the light emitting module 20 and the reflector 40 have a predetermined positional relationship.
The detailed relationship between the COB 21 and the reflector 40 will be described later.

  Although details are omitted, in the lighting device 10 according to the present embodiment, the mounting portion 32 of the support member 30 can slide in the front-rear direction (the direction in which the support member 30 contacts and separates from the reflector 40). Yes. Thereby, in the illuminating device 10 of this embodiment, the attachment position of the support member 30 with respect to the housing | casing 50 can be adjusted, and the distance of the light emitting module 20 (COB21) and the reflector 40 can be adjusted now.

As shown in FIG. 3, in the support member 30 of this embodiment, the width of the attachment portion 32 is narrower than the width of the heat dissipation portion 31. Thereby, in the illuminating device 10 of this embodiment, it is suppressed that the light radiate | emitted from the light emitting module 20 and reflected by the reflector 40 is blocked | interrupted by the attaching part 32. FIG.
Although not shown, in the present embodiment, the wiring connected to the light emitting module 20 is accommodated in the attachment portion 32 of the support member 30. Thereby, it can suppress that a wiring is visually recognized from the exterior of the illuminating device 10, and the fall of the appearance of the illuminating device 10 is suppressed. Furthermore, it is possible to suppress a shadow from being generated in the irradiation field of the lighting device 10 due to the wiring.

  The support member 30 is preferably composed of a member having high thermal conductivity such as aluminum or copper. Thereby, it becomes easier to radiate the heat generated in the light emitting module 20 through the support member 30, and an excessive temperature rise of the light emitting module 20 is suppressed.

(Light Emitting Module 20)
Next, the configuration of the light emitting module 20 will be described. 4A to 4C are diagrams showing the configuration of the light emitting module 20 of the present embodiment. 4A is an exploded perspective view of the light emitting module 20, and FIG. 4B is a front view of the light emitting module 20 as viewed from the front side (downstream in the light emission direction). ) Is a sectional view taken along the line IVC-IVC in FIG.
As shown in FIGS. 4A to 4C, the light emitting module 20 of the present embodiment includes a COB (chip on board) 21 including a plurality of light emitting chips 210 and a part of the COB 21 attached to the front side of the COB 21. And a covering member 22 for covering.

(COB21)
As shown in FIG. 4C, the COB 21 of the present embodiment includes a plurality of light emitting chips 210 that are arranged in a predetermined arrangement and each emit light, and a plate-like member such as aluminum, and supports the light emitting chips 210. A substrate 211, a phosphor layer 212 that is laminated on the light emitting chip 210 and emits fluorescence by light from the light emitting chip 210, and a light diffusion layer 213 that is laminated on the phosphor layer 212 and diffuses light from the light emitting chip 210. I have.

Each of the light emitting chips 210 of the present embodiment is composed of an LED (light emitting diode) chip that emits light having a wavelength in the blue to near ultraviolet region, for example.
In addition, as illustrated in FIG. 4C and the like, the phosphor layer 212 of the present embodiment is provided across a plurality of light emitting chips 210 disposed on the substrate 211. In other words, in the COB 21 of the present embodiment, the phosphor layer 212 is also provided in the gap between the plurality of light emitting chips 210.
The phosphor used in the phosphor layer 212 of the present embodiment is not particularly limited as long as it generates fluorescence by light from the light emitting chip 210, and examples thereof include a YAG yellow phosphor.

  In the COB 21 of the present embodiment, blue to near-ultraviolet light emitted from the light emitting chip 210 enters the phosphor layer 212, and the phosphor in the phosphor layer 212 is excited to produce yellow fluorescence. Accordingly, in the COB 21 of the present embodiment, white light is emitted by mixing blue to near ultraviolet light from the light emitting chip 210 and yellow fluorescence from the phosphor layer 212. Yes.

In the COB 21 of the present embodiment, the light emitted from the light emitting chip 210 and passing through the phosphor layer 212 is diffused by the light diffusion layer 213. Thereby, in this embodiment, the illumination intensity of the illuminating device 10 improves compared with the case where the light-diffusion layer 213 is not provided.
Furthermore, in the COB 21 of the present embodiment, by providing the light diffusion layer 213, blue to near-ultraviolet light from the light emitting chip 210 and yellow light from the phosphor layer 212 are diffused in the light diffusion layer 213. Get mixed up. Thereby, compared with the case where the light diffusion layer 213 is not provided,
The whiteness of the irradiation light is improved, and uneven color tone and illuminance unevenness in the irradiation field of the illumination device 10 are suppressed.
Although it does not specifically limit as the light-diffusion layer 213, For example, what disperse | distributed particle | grains, such as calcium carbonate and titanium dioxide, to resin, such as an acryl and a polycarbonate, can be used.

Here, in the COB 21 of the present embodiment, as shown in FIG. 4C, the plurality of light emitting chips 210 are arranged so as to have a predetermined gap between the adjacent light emitting chips 210. Note that the number of light emitting chips 210 provided in the COB 21 and the arrangement of the light emitting chips 210 are determined in consideration of the illuminance of light desired to be obtained by the lighting device 10, the light irradiation area, and the like. Although it depends on the performance of the light emitting chip 210 and the like, when a plurality of light emitting chips 210 are arranged densely without providing a gap, the illuminance of light by the lighting device 10 becomes higher than the desired illuminance or light irradiation. The area becomes smaller. Further, when the light emitting chips 210 are densely arranged in the COB 21, it is difficult to dissipate heat generated in the light emitting chips 210, and the light emission efficiency of the light emitting chips 210 may be reduced.
Therefore, normally, in the COB 21, a plurality of light emitting chips 210 are often arranged with a gap between adjacent light emitting chips 210.

  In the COB 21 of the present embodiment, the light emitting chip E is present on the substrate 211 and the light emitting chip 210 is present on the substrate 211 by arranging the plurality of light emitting chips 210 so as to have a gap. Thus, a non-light emitting region E2 in which only the phosphor layer 212 and the light diffusion layer 213 exist is formed (see also FIG. 7 described later).

The light emission area E1 and the non-light emission area E2 of the COB 21 are different in intensity (illuminance) and color tone of emitted light.
More specifically, since light is emitted from the light emitting chip 210 in the light emitting area E1 of the COB 21, the light intensity is higher than that in the non-light emitting area E2. Further, in the light emitting region E1, blue to near-ultraviolet light from the light emitting chip 210 and yellow light from the phosphor layer 212 are mixed, and thus light having a higher whiteness than the non-light emitting region E2 is emitted. Is done.

On the other hand, in the non-light emitting area E2 of the COB 21, since the light emitting chip 210 does not exist, only the fluorescence generated by the light incident from the light emitting chip 210 in the light emitting area E1 is emitted. Therefore, in the non-light emitting region E2, the intensity is lower than that of the light emitting region E1, and light close to yellow derived from fluorescence by the phosphor layer 212 is emitted.
As described above, when the light diffusing layer 213 is provided on the phosphor layer 212 in the COB 21, light is diffused and mixed in the light diffusing layer 213, and therefore, between the light emitting region E1 and the non-light emitting region E2. Although light intensity differences and color tone differences are reduced, it is usually difficult to completely eliminate these differences.

(Covering member 22)
As shown in FIGS. 4A to 4C, the covering member 22 of the present embodiment includes a light shielding part 220 for shielding light from the COB 21, and an opening part 221 for extracting light from the COB 21 to the outside. Have As shown in FIG. 4A and the like, the opening 221 is provided through the cover member 22 in the traveling direction of the light emitted from the COB 21.
In the light emitting module 20 of the present embodiment, the cover member 22 is attached to the COB 21 so that the openings 221 face the plurality of light emitting chips 210. And the light radiate | emitted from the light emitting chip 210 of COB21 passes through the opening part 221, and is irradiated toward the reflector 40 (refer FIG. 2).

  Further, in the light emitting module 20 of the present embodiment, light from the light emitting chip 210 positioned outside the opening 221 is blocked by the light blocking portion 220 of the covering member 22. As a result, light is emitted from the light emitting module 20 in a predetermined direction. As a result, it can suppress that the light from the illuminating device 10 enters into a patient's eyes or is irradiated to an unnecessary site | part.

Here, as shown in FIG. 4B and the like, the opening 221 of the present embodiment has a rectangular shape. In the COB 21 of the present embodiment, the region where the light emitting chip 210 is disposed on the substrate 211 is also rectangular. In the present embodiment, the size of the opening 221 of the cover member 22 is smaller than the area where the light emitting chip 210 is disposed in the COB 21.
This suppresses the formation of the non-light-emitting region E2 around the arrangement of the plurality of light-emitting chips 210 inside the opening 221 and the irradiation field of the illumination device 10 as compared with the case where this configuration is not adopted. The occurrence of uneven color tone in the peripheral portion is suppressed.

It is preferable that at least the surface of the covering member 22 of the present embodiment is made of a light shielding material that blocks light from the COB 21. Thereby, it is suppressed that the light from COB21 reflects on the surface of the covering member 22, and it is more suppressed that light is irradiated in the direction which is not intended from the light emitting module 20. FIG.
Moreover, in the light emitting module 20 of this embodiment, as shown in FIG.4 (c) etc., the cover member 22 is attached with respect to COB21 so that a space | gap may be made between COB21 and the cover member 22. FIG. Thereby, for example, the disconnection of the COB 21 due to the cover member 22 coming into contact with the COB 21 is suppressed.

(Reflector 40)
Next, the configuration of the reflector 40 will be described. FIGS. 5A to 5C are diagrams showing the configuration of the reflector 40 to which the present embodiment is applied. Fig.5 (a) is the front view which looked at the reflector 40 from the front side (downstream side of the emission direction of the light of the illuminating device 10) of the illuminating device 10, FIG.5 (b) is FIG.5 (a). It is VB-VB sectional drawing, and FIG.5 (c) is VC-VC sectional drawing of Fig.5 (a).

  As shown in FIGS. 5A to 5B, the reflector 40 of this embodiment has a plurality of reflecting surfaces 41 that reflect the light emitted from the COB 21. More specifically, the reflector 40 of the present embodiment is provided with a plurality of reflecting surfaces 41 each having a long shape, arranged side by side in the short direction. In the following description, when the reflector 40 is viewed from the front side as shown in FIG. 5A, the direction in which the plurality of reflecting surfaces 41 are arranged is referred to as the X direction (lateral direction), and each reflecting surface 41 is arranged. Is referred to as the Y direction (vertical direction). A direction in which the reflected light travels by the reflector 40 and is orthogonal to the X direction and the Y direction is referred to as a Z direction.

As shown in FIG. 5B, in the reflector 40 of the present embodiment, when viewed from the Y direction, adjacent reflecting surfaces 41 are arranged so as to have a predetermined angle (> 90 °). . Thereby, the reflector 40 of this embodiment has a concave shape curved in the light reflection direction (Z direction) as a whole when viewed from the Y direction. And each reflective surface 41 provided in the reflector 40 faces the light emitting module 20 side (refer also to Fig.6 (a) mentioned later).
Further, as shown in FIG. 5C, in the reflector 40 of this embodiment, when viewed from the X direction, the central portion of each reflecting surface 41 is recessed upstream in the Z direction, and the reflecting surface 41 as a whole is arcuate. It has the shape of

(About the optical path of irradiation light in the illumination device 10)
Then, the optical path of the light irradiated by the illuminating device 10 is demonstrated. FIGS. 6A and 6B are diagrams for explaining an optical path of light irradiated by the illumination device 10 of the present embodiment, and FIG. 6A shows light irradiated by the illumination device 10. FIG. 6B is a schematic view showing the irradiation field of the illumination device 10, and FIG. 6A shows the irradiation field of the illumination device 10. Corresponding to the area indicated by VIB. In addition, in FIG. 6A, description is abbreviate | omitted about structures other than the light emitting module 20 and the reflector 40 in the illuminating device 10. FIG.

First, the relationship between the light emitting module 20 and the reflector 40 in the illumination device 10 will be described. In the illuminating device 10 of this embodiment, the light emitting module 20 is provided in the position away from the reflector 40 rather than the focus of the reflector 40 which is a kind of concave mirror. In other words, in the illumination device 10 of the present embodiment, the distance L from the reflector 40 to the light emitting module 20 (more specifically, the COB 21) is longer than the focal length of the reflector 40.
Here, when the light source is placed in front of the reflector 40, the position where the reflected light from the reflecting surface 41 becomes parallel light is the focal point of the reflector 40.

In the illuminating device 10 of the present embodiment, the light emitted from the light emitting module 20 first travels toward the reflector 40. As described above, since the plurality of reflecting surfaces 41 of the reflector 40 face the light emitting module 20 side, the light emitted from the light emitting module 20 is directed to each reflecting surface 41 of the reflector 40, and each reflecting surface. 41 is reflected.
And as mentioned above, in the illuminating device 10 of this embodiment, since the distance L from the reflector 40 to the light emitting module 20 is longer than the focal distance of the reflector 40, the light emitted from the light emitting module 20 By being reflected by the reflection surface 41, the light is narrowed down (condensed) to a predetermined region smaller than the area of the reflector 40.

The illuminating device 10 of this embodiment is used such that an irradiation target such as a patient's medical site is located at a predetermined distance D (about 700 mm in this example) from the light emitting module 20 in the Z direction.
In the following description, a region where an irradiation target is located and light is irradiated by the illumination device 10 (irradiation field of the illumination device 10) is referred to as an irradiation region R.

In the illumination device 10 of the present embodiment, in the irradiation region R, the reflected light (reflected image) reflected by each reflecting surface 41 of the reflector 40 is reflected from the reflected light (reflected image) by the reflecting surface 41 adjacent in the X direction. It is irradiated so as to overlap.
That is, in the illuminating device 10 of this embodiment, as shown in FIG.6 (b), a part of reflected light Ba reflected by the reflective surface 41a of the reflector 40 is adjacent to the reflective surface 41a in the X direction. The irradiation region R is irradiated so as to overlap with a part of the reflected light Bb reflected by the reflecting surface 41b. In other words, the region indicated by P in the irradiation region R in FIG. 6B is irradiated with both the reflected light Ba reflected by the reflecting surface 41a and the reflected light Bb reflected by the reflecting surface 41b. ing.

  Thereby, in this embodiment, even if it is a case where a dentist's hand and a medical treatment tool exist between the illuminating device 10 and the irradiation area | region R, it is suppressed that a shadow arises in the irradiation area | region R. (Shadowless effect). More specifically, in FIG. 6A, when a dentist's hand or the like is on the optical path of the reflected light Ba by the reflecting surface 41a of the reflector 40, the reflected light Ba is blocked, but by the reflecting surface 41b. The reflected light Bb is irradiated to the region P of the irradiation region R without being blocked. Therefore, it is suppressed that a shadow is generated in the region P of the irradiation region R.

  By the way, conventionally, in the illuminating device 10 using the reflector 40 which has the some reflective surface 41, there exists a problem that illumination intensity nonuniformity and color tone nonuniformity are easy to produce in the irradiation area | region R (irradiation field) irradiated with irradiation light. 10A and 10B are diagrams for explaining the problems in the conventional lighting device 10, and FIG. 10A is an example of the arrangement of the light emitting chips 210 in the COB 21 of the conventional lighting device 10. FIG. 10B is a schematic diagram illustrating an example of irradiation light emitted by the conventional lighting device 10. In FIG. 10A, descriptions of the phosphor layer 212, the light diffusion layer 213, and the like are omitted.

In the conventional COB 21, a plurality of light emitting chips 210 are arranged on lattice points of a square lattice. That is, as shown in FIG. 10A, in the conventional COB 21, a square lattice lattice composed of a plurality of straight lines extending in the X direction and arranged at equal intervals and a plurality of straight lines extending in the Y direction and arranged at equal intervals. At a point, a plurality of light emitting chips 210 are arranged. In other words, in the COB 21 shown in FIG. 10A, the light emitting chips 210 adjacent to each other in the X direction are arranged in the Y direction.
In the conventional COB 21, a plurality of light emitting chips 210 are arranged at lattice points of a square lattice, so that a non-light emitting region E2 in which no light emitting chips 210 are present extends in both the X direction and the Y direction. The Further, when the conventional COB 21 is viewed along the Y direction, as shown in FIG. 10A, a region (first region F1) in which light emitting regions E1 and non-light emitting regions E2 are alternately formed in the X direction and The regions (second regions F2) where only the non-light emitting regions E2 are formed along the X direction are alternately arranged in the Y direction.

And when the light emitting module 20 provided with COB21 shown to Fig.10 (a) is used for the illuminating device 10 which has the reflector 40 mentioned above, in irradiation region R, irradiation light is irradiated and overlapped with a X direction. Irradiance unevenness and color unevenness will occur.
Specifically, as described above, the reflected light from the reflecting surface 41 of the reflector 40 is irradiated in the X direction in the irradiation region R, so that the irradiation field of the light emitted from the conventional COB 21 by the reflector 40 is irradiated. Then, a part of the reflected light of the first region F1 by the respective reflecting surfaces 41 overlaps with each other in the X direction, and a part of the reflected light of the second region F2 by the respective reflecting surfaces 41 overlaps each other.

Here, in the first region F1, as described above, the light emitting regions E1 and the non-light emitting regions E2 are alternately arranged in the X direction. Thereby, in the portion where the reflected light of the first region F1 overlaps in the irradiation region R, the reflected light of the light emitting region E1 by the one reflecting surface 41 and the reflected light of the non-light emitting region E2 by the other reflecting surface 41 overlap. It becomes like this.
That is, in the irradiation region R, the light where the reflected light of the first region F1 overlaps is irradiated with the light that is reflected by the reflected light of the light emitting region E1 and the reflected light of the non-light emitting region E2.

On the other hand, as described above, since the second region F2 is configured only by the non-light emitting region E2, in the portion where the reflected light of the second region F2 overlaps in the irradiation region R, non-reflection by the one reflecting surface 41 is performed. The reflected light of the light emitting region E2 and the reflected light of the non-light emitting region E2 by the other reflecting surface 41 overlap.
That is, in the irradiation region R, in the portion where the reflected light of the second region F2 overlaps, the light that is reflected by the non-light emitting region E2 is irradiated and the reflected light of the light emitting region E1 is not irradiated.

  Therefore, in the illumination device 10 using the conventional COB 21, there is a difference in illuminance and color between the portion where the reflected light of the first region F1 overlaps with the portion where the reflected light of the second region F2 overlaps in the irradiation region R. Arise. Specifically, in the portion where the reflected light of the second region F2 overlaps in the irradiation region R, the illuminance is lower than in the portion where the reflected light of the first region F1 overlaps, and the fluorescence from the phosphor layer 212 is reduced. Near yellow light is emitted. That is, as shown in FIG. 10B, in the irradiation region R, yellow stripes YL extending in the X direction are generated corresponding to the portions where the reflected lights of the second region F2 overlap each other, and uneven illuminance is generated in the irradiation region R. And uneven color tone may occur.

  Note that the lighting device 10 is used, for example, for dental practice, but generally, teeth used for dental practice, pastes used for dental practice, and the like have a color close to white. Therefore, when the illuminating device 10 is used for dental practice, uneven illuminance and uneven color tone that are generated in the light irradiation region R by the illuminating device 10 are more conspicuous. And when the illumination intensity nonuniformity and color tone nonuniformity arise in the irradiation area | region R of the light by the illuminating device 10, identification of the fine color required in dental treatment etc. may become difficult.

(Arrangement of light emitting chip 210)
On the other hand, in the present embodiment, the arrangement of the plurality of light emitting chips 210 in the COB 21 is different from the conventional arrangement, thereby suppressing uneven illuminance and uneven color tone in the irradiation region R (irradiation field).
Next, the arrangement of the light emitting chips 210 in the COB 21 of this embodiment will be described. FIG. 7 is a diagram showing an example of the arrangement of the light emitting chips 210 in the COB 21 to which the present embodiment is applied. In FIG. 7, descriptions of the phosphor layer 212, the light diffusion layer 213, and the like are omitted.

As shown in FIG. 7, in the COB 21 of the present embodiment, a plurality of light emitting chips 210 are arranged in a staggered manner. In other words, the arrangement of the light emitting chips 210 shown in FIG. 7 is an even number counted in the X direction among the rows of the light emitting chips 210 arranged in the Y direction in the arrangement of the conventional light emitting chips 210 shown in FIG. Are arranged in the Y direction by the width of the light emitting chip 210.
From another point of view, the arrangement of the light emitting chips 210 shown in FIG. 7 is such that the arrangement direction of the light emitting chips 210 (the direction indicated by the broken line in FIG. 7) is inclined with respect to the X direction.
Further, when focusing on the individual light emitting chips 210, in this embodiment, as shown in FIG. 7, the positions of the light emitting chips 210 adjacent in the X direction (for example, the positions of the light emitting chips 210a and 210b) are Y It is shifted in the direction.

  In the COB 21 of the present embodiment, the light emitting chip 210 is arranged as described above, so that the light emitting areas E1 and the non-light emitting areas E2 are alternately arranged in the X direction over the entire area of the COB 21. ing. In other words, in the COB 21 shown in FIG. 7, unlike the conventional example shown in FIG. 10A, the non-light emitting region E2 is not continuous along the X direction and is divided into a plurality of portions in the X direction by the light emitting region E1. Has been.

  Thereby, in the illuminating device 10 of this embodiment, even when the reflected light by the several reflective surface 41 is irradiated in the X direction in the irradiation area | region R, it is suppressed that the reflected light of the non-light-emitting area | region E2 overlaps. The Thereby, in the irradiation region R, it is suppressed that only the reflected light of the non-light emitting region E2 is irradiated along the X direction, and yellow streaks YL are generated along the X direction as shown in FIG. 10B. It is suppressed.

FIG. 8 is a diagram illustrating an example of an irradiation region R (irradiation field) in the illumination device 10 of the present embodiment. Note that FIG. 8 shows an enlargement of the irradiation field in the region P where the reflected light from the reflecting surface 41a and the reflected light from the reflecting surface 41b are overlapped among the irradiation fields by the illumination device 10 shown in FIG. 6B. Corresponds to the figure.
In the present embodiment, by arranging the light emitting chips 210 in a staggered manner, in the irradiation region R, the reflected light of the light emitting region E1 and the reflected light of the non-light emitting region E2 out of the reflected light by the adjacent reflecting surfaces 41. It will be irradiated with overlapping.

Specifically, as shown in FIG. 8, in the irradiation region R, the reflected light (B1a) of the light emitting region E1 out of the reflected light from the reflective surface 41a (see FIG. 6A) and the reflective surface 41b (FIG. 8). 6 (a)), the reflected light (B2b) of the non-light emitting region E2 is overlapped and irradiated, and the reflected light (B2a) of the non-light emitting region E2 among the reflected light of the reflecting surface 41a and the reflecting surface Of the light reflected by 41b, the light reflected by the light emitting region E1 (B1b) is overlapped and irradiated.
Thereby, in the irradiation region R, the occurrence of uneven illuminance and uneven color tone due to the reflected light of the non-light emitting region E2 overlapping in the X direction is suppressed.

FIGS. 9A and 9B are diagrams showing another example of the arrangement of the light emitting chips 210 in the COB 21. FIG. In FIGS. 9A to 9B, descriptions of the phosphor layer 212, the light diffusion layer 213, and the like are omitted.
The arrangement of the light emitting chips 210 in the COB 21 is not limited to the arrangement shown in FIG. 7 as long as the non-light emitting area E2 is not continuously formed over the entire region in the X direction. In other words, the arrangement of the light emitting chip 210 in the COB 21 is such that when the reflected light from the respective reflecting surfaces 41 of the reflector 40 in the irradiation region R overlaps in the X direction, the reflected light from the light emitting region E1 and the reflected light from the non-light emitting region E2. It is possible to adopt an arrangement in which the two are overlapped and irradiated.

For example, as shown in FIG. 9A, if the non-light emitting region E2 is not continuously formed over the entire region in the X direction, the COB 21 is adjacent to the X direction among the plurality of light emitting chips 210. The positions of some of the light emitting chips 210 may be aligned in the Y direction.
Further, as shown in FIG. 9B, a COB 21 in which the light emitting chip 210 is arranged on a lattice point of a square lattice may be rotated by a predetermined angle. As shown in FIG. 9B, by rotating the COB 21 in which the light emitting chips 210 are arranged in a lattice shape, the light emitting chips 210 adjacent to each other in the X direction are arranged so as to be shifted in the Y direction and cover the entire area in the X direction. Thus, the non-light emitting region E2 is not continuously formed.
Although not shown, the light emitting chips 210 may not be regularly arranged. That is, the light emitting chips 210 adjacent to each other in the X direction are shifted from each other in the Y direction, and the plurality of light emitting chips 210 are randomly arranged so that the non-light emitting region E2 is not continuously formed over the entire area in the X direction. May be.

  In the above-described example, the lighting device 10 is described as being used for the dental medical device 1, but the lighting device 10 of the present embodiment can be used for medical purposes other than dentistry.

DESCRIPTION OF SYMBOLS 1 ... Dental medical device, 10 ... Illuminating device, 20 ... Light emitting module, 21 ... COB, 22 ... Cover member, 40 ... Reflector, 41 ... Reflecting surface, 210 ... Light emitting chip, 211 ... Substrate, 212 ... Phosphor layer, 213: Light diffusing layer, E1: Light emitting area, E2: Non-light emitting area

Claims (7)

A light source in which a plurality of light emitting chips each emitting light are arranged on a substrate;
A plurality of reflecting surfaces each extending in the vertical direction and reflecting the light from the light emitting chip are arranged in a horizontal direction at a predetermined angle to form a concave surface, each reflecting surface facing the light source, and a reflector With
In the light source, one light emitting chip of the plurality of light emitting chips and another light emitting chip adjacent in the lateral direction with respect to the one light emitting chip are arranged so as to be shifted in the vertical direction. Lighting device.   The lighting device according to claim 1, wherein the light source has an arrangement direction of the plurality of light emitting chips inclined with respect to the lateral direction.   2. The lighting device according to claim 1, wherein the light source is formed such that a region where the light emitting chip does not exist on the substrate is not continuously formed in the lateral direction.   The lighting device according to claim 1, wherein the light source includes a light diffusion layer that is stacked on the plurality of light emitting chips and diffuses light emitted from the plurality of light emitting chips. A plurality of reflecting surfaces each extending in the vertical direction are light emitting modules that are used to face the reflecting surface of the reflector formed with a concave surface by forming a predetermined angle in the horizontal direction,
A substrate,
A plurality of light emitting chips each emitting light and disposed on the substrate,
The light emitting module, wherein the plurality of light emitting chips are arranged such that one light emitting chip and another light emitting chip adjacent to the one light emitting chip in the horizontal direction are shifted in the vertical direction. . Covering the plurality of light emitting chips together, a phosphor layer that emits fluorescence by light from the plurality of light emitting chips,
6. The light diffusion layer according to claim 5, further comprising a light diffusion layer that is laminated on the phosphor layer and diffuses the light emitted from the plurality of light emitting chips and the fluorescence generated in the phosphor layer. Light emitting module. Medical instruments used for medical care;
An illumination device that irradiates a medical site with the medical instrument;
The lighting device includes:
A light source in which a plurality of light emitting chips each emitting light are arranged on a substrate;
A plurality of reflecting surfaces each extending in the vertical direction and reflecting the light from the light emitting chip are arranged in a horizontal direction at a predetermined angle to form a concave surface, each reflecting surface facing the light source, and a reflector With
In the light source of the illuminating device, one light emitting chip of the plurality of light emitting chips and another light emitting chip adjacent to the one light emitting chip in the horizontal direction are arranged so as to be shifted in the vertical direction. A medical device characterized by that.

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