WO2013058013A1

WO2013058013A1 - Flat lamp device

Info

Publication number: WO2013058013A1
Application number: PCT/JP2012/071325
Authority: WO
Inventors: 横田　昌広; 修小野; 修介森田; 高橋　健; 信雄川村; 大川　猛; 英男太田; 松田　秀三; 西村　孝司
Original assignee: 株式会社東芝
Priority date: 2011-10-20
Filing date: 2012-08-23
Publication date: 2013-04-25
Also published as: JP5232283B2; JP2013089539A

Abstract

A flat lamp device according to an embodiment is provided with a flat substrate (2), a plurality of light sources (4) positioned in the peripheral region of the substrate and having light distribution that has strong directivity in the direction of the normal, and a translucent cover (6) for covering the light source. The translucent cover has a hollow projecting part (10) that faces at least a portion of the light sources (4), and projects in a direction away from the substrate.

Description

Flat type lamp device

An embodiment of the present invention relates to, for example, a flat lamp device having a GX53 base.

As a flat and compact lamp apparatus, for example, a flat cylindrical lamp apparatus using a GX53 base is known. In such a flat type lamp device, a flat GX53 type base is used, and a flat light source is disposed on a flat main body and a flat cover is combined to realize a flat lamp device as a whole. In flat-type lamp devices, there is a technique of extending the peripheral portion of the cover member to the side of the lamp device to guide light as a technique corresponding to the application of irradiating the side or back side.

JP, 2008-140606, A JP, 2010-192338, A

In the flat type lamp device, light is strongly irradiated in the normal direction of the flat surface, and only extremely weak light can be emitted to the side or back side of the lamp device. This tendency is particularly noticeable when an LED light source is used. Even when the cover member is used, the illuminance from the side surface to the back surface of the lamp device is weak.

This invention is made in view of the above point, The subject is to provide the flat type lamp device which can be irradiated from a side to a back side.

According to an embodiment, a flat lamp device includes a flat substrate, a plurality of light sources disposed in a peripheral region on the substrate and having a strong directivity in the normal direction, and the light source And a translucent cover, wherein the translucent cover has a hollow protrusion that faces the at least a part of the light source and protrudes in a direction away from the base material.

FIG. 1 is a cross-sectional view showing a flat lamp device according to a first embodiment. FIG. 2 is a view showing light distribution of the flat lamp device according to the first embodiment. FIG. 3 is a view showing the relationship between the light distribution angle and the efficiency when the transmittance of the translucent cover 6 in the flat lamp device is changed. FIG. 4 is a view showing the relationship between the light distribution angle and the efficiency when the height h of the convex portion of the light transmitting cover in the flat lamp device is changed. FIG. 5 is a cross-sectional view showing a flat lamp device according to a second embodiment. FIG. 6 is a cross-sectional view showing a flat lamp device according to a third embodiment. FIG. 7 is a cross-sectional view showing a flat lamp device according to a fourth embodiment. FIG. 8 is a cross-sectional view showing a flat lamp device according to a fifth embodiment. FIG. 9 is a cross-sectional view showing a flat lamp device according to a sixth embodiment. FIG. 10 is a cross-sectional view showing a flat lamp device according to a seventh embodiment.

Hereinafter, flat-type lamp devices according to various embodiments will be described in detail with reference to the drawings.
First Embodiment
FIG. 1 is a cross-sectional view showing a flat lamp device 1 according to the first embodiment. The flat lamp device 1 has a flat cylindrical shape, and has a shape obtained by rotating the illustrated cross section with respect to the central axis.

The flat lamp device 1 includes a flat disk-shaped base 2, a base 3, a substrate 5 on which a light source 4 is mounted, and a light transmitting cover 6. The base 2 is made of metal and has a flat front surface 2a. The base 2 is a heat sink of the heat generated by the light source 4 and has a function of radiating heat to the outside from a heat radiation structure (not shown).

The base 3 is formed in a stepped disk shape that fits in a flat GX 53-type socket, and is embedded on the back side of the base 2. The base 3 has a plurality of terminals 3a adapted to the GX53 type socket, and accommodates the drive circuit 3b inside. The drive circuit 3b is energized through the terminal 3a, and the light source 4 is lit via the substrate 5 by the drive power generated by the drive circuit.

For example, a disk-shaped substrate 5 is fixed on the front surface 2 a of the base 2, and a plurality of light sources 4 are mounted on the substrate 5. The light source 4 uses an LED, emits strong light in the normal direction of the substrate 5, ie, the normal direction of the flat surface, and when the angle from the normal direction is θ, the side direction in proportion to cos θ It has directivity that the luminous intensity to becomes weak. In the present embodiment, with respect to the base material 2 having a diameter of 80 mm, a plurality of light sources 4 are arranged in a circle that is coaxial with the base material 2 5 mm inside from the periphery thereof.

The light transmitting cover 6 is formed in a substantially disc shape by a milky white resin having a transmittance of 57%. The light transmitting cover 6 is placed on the base 2 so as to cover the light source 4 and the front surface 2 a of the base 2, and the peripheral portion of the light transmitting cover 6 is sealingly fixed to the base 2. The translucent cover 6 has an annular and hollow protrusion 10 facing the light source 4. Further, the central portion of the light transmitting cover 6 is gently curved from the center thereof toward the protrusion 10 slightly upward, that is, in the direction away from the base material 2. The protrusion 10 has, for example, an elliptical cross-sectional shape that protrudes forward with respect to the base material 2. The elliptical cross section of the projection 10 is at a radial position where the highest point coincides with the light source 4 and has elliptical inclined surfaces on the inside and the outside of the light source 4.

As shown in FIG. 1, the protrusion 10 is formed in a vertically long cross-sectional shape in which the height in the normal direction of the base material 2 is higher than the width in the radial direction. That is, the radial distance between the cross point of the cross section of the protrusion 10 and the light source 4 at the intersection of the cross section of the base 2 with the light source 4 is do, and the cross profile of the protrusion 10 and the base 2 similarly Let the radial distance between the intersection of the light source 4 and the light source 4 with the light source 4 be di, and the height distance between the highest point of the cross section of the light transmitting cover 6 and the mounting surface of the substrate 5 on the substrate 2 be h. Sometimes, in the embodiment, di = do = 5 mm and h = 20 mm.

Such a light transmitting cover 6 temporarily receives light with strong directivity in the normal direction of the flat surface emitted from the light source 4 and diffuses the light sufficiently inside the light transmitting cover 6. It emits light to the outside with strong directivity in the normal plane direction. In the present embodiment, the cross section of the projection 10 of the light transmitting cover 6 covering the light source 4 is sufficiently longitudinally elongated, that is, longitudinally elongated in the normal direction with respect to the front surface portion 2 a of the base 2. Therefore, when an angle range in which the light intensity is reduced by half with respect to the light intensity in the normal direction of the flat surface is defined as a light distribution angle, the light distribution angle is extended to 160 degrees. In addition, the translucent cover 6 emits light toward the periphery toward the periphery.

FIG. 2 shows the light distribution of the flat lamp device 1 of the present embodiment. From this figure, the light intensity of the light emitted by the flat lamp device 1 is substantially uniform up to 45 degrees with respect to the normal direction, and is halved at around 80 degrees, but it is also to the back side exceeding 90 degrees It can be seen that it has been released firmly.

FIG. 3 shows the result of evaluating the influence of the light distribution angle and the efficiency when changing the transmittance of the light transmitting cover 6 in the present embodiment. In the figure, the solid line indicates the light distribution angle, and the alternate long and short dash line indicates the efficiency. From this figure, it is understood that the light distribution angle is not sufficiently expanded unless the transmittance of the light transmitting cover 6 is 80% or less. This is because when the transmittance is high, the light distribution of the light source 4 itself is maintained while the diffusion inside the light transmitting cover 6 is insufficient, and the light is transmitted.

FIG. 4 shows the result of evaluating the influence of the light distribution angle and the efficiency when the height h of the protrusion 10 is changed with the transmittance of the light transmitting cover 6 being 57% in the present embodiment. In the figure, the solid line indicates the light distribution angle, and the alternate long and short dash line indicates the efficiency. From this figure, when h / di (or h / do) is 1, that is, when the elliptical cross section approaches the spherical cross sectional shape, the light distribution angle becomes the same as the light source 4 itself and does not spread. In order to widen the light distribution angle, it is preferable to make the protrusions 10 longitudinally, and therefore, it is desirable to make h / di (or h / do) larger than one.

According to the first embodiment configured as described above, a considerable amount of light can be irradiated from the side surface to the back side of the device by the light transmitting cover 6, and a flat lamp device with a wide light distribution is realized. can do.

Next, a flat lamp device according to another embodiment will be described. In other embodiments to be described later, the same reference numerals are given to the same portions as the first embodiment described above, and the detailed description thereof will be omitted.

Second Embodiment
FIG. 5 is a cross-sectional view showing a flat lamp device 1 according to a second embodiment. The basic configuration of the lamp device 1 is the same as that of the first embodiment, and the configuration of the light transmitting cover 6 is partially different. In the second embodiment, the central region of the light transmitting cover 6 is formed flat, and is adjacently opposed to the front surface portion 2 a of the base 2. As a result, in the protrusion 10 of the light transmitting cover 6, the area of the raised portion located inside the light source 4 is increased, and the light distribution angle is further expanded.

Third Embodiment
FIG. 6 is a cross-sectional view showing a flat lamp device 1 according to a third embodiment. The basic configuration of the lamp device 1 is the same as that of the first embodiment, and the configuration of the light transmitting cover 6 is partially different. In the third embodiment, the cross-sectional shape of the protrusion 10 covering the light source 4 of the light transmitting cover 6 is rectangular, and this portion is localized more than other portions so that light is less likely to be transmitted in the region facing the light source 4 It is getting thicker.

Fourth Embodiment
FIG. 7 is a cross-sectional view showing a flat lamp device 1 according to a fourth embodiment. The basic configuration of the lamp device 1 is the same as that of the first embodiment, and the configuration of the light transmitting cover 6 is partially different. In the third embodiment, the cross-sectional shape of the protrusion 10 covering the light source 4 of the light transmitting cover 6 is rectangular, and the portion facing the light source 4 is uneven in a wave shape, for example. Makes it difficult to see through.

Fifth Embodiment
FIG. 8 is a cross-sectional view showing a flat lamp device 1 according to the fifth embodiment. The basic configuration of the lamp device 1 is the same as that of the first embodiment, and the configuration of the light transmitting cover 6 is partially different. According to the fifth embodiment, the plurality of light sources 4 are disposed slightly inward from the outer peripheral edge of the substrate 2 at a position of do = 10 mm, and the projections 10 of the light transmitting cover 6 covering the light sources 4 have an elliptical inside and outside symmetry. It was a cross section. di is 5 mm, and the highest point of the elliptical cross section is shifted to the outside of the light source 4. For this reason, light in the normal direction of the flat surface emitted at the strongest light intensity from the light source 4 is obliquely incident on the light transmission cover 6, and it is difficult to transmit even if the light transmission cover 6 is thin. The spreading effect is improved.

Sixth Embodiment
FIG. 9 is a cross-sectional view showing a flat lamp device 1 according to a sixth embodiment. The basic configuration of the lamp device 1 is the same as that of the first embodiment, and the configuration of the light transmitting cover 6 is partially different. According to the sixth embodiment, the plurality of light sources 4 are disposed slightly inward from the outer peripheral edge of the base 2 at a position of do = 10 mm, and the projections 10 of the light transmitting cover 6 covering the light sources 4 have an elliptical inside and outside symmetry. It was a cross section. Moreover, the cross-sectional shape of the protrusion 10 makes d0 small so that it may be set to di = do = 5 mm and a longitudinally long aspect. Thereby, the highest point of the elliptical cross section coincides with the radial position of the light source 4.

In this case, a flat flange portion 6b can be formed at the outer peripheral end of the light transmission cover 6. Alternatively, when the flange portion is not provided, the outer peripheral edge of the base material 2 is exposed. The cross-sectional shape of the protrusion 10 is vertically elongated, and the spread of the light distribution angle is improved.

Seventh Embodiment
FIG. 10 is a cross-sectional view showing a flat lamp device 1 according to a seventh embodiment. The basic configuration of the lamp device 1 is the same as that of the first embodiment, and the configuration of the light transmitting cover 6 is partially different. According to the seventh embodiment, the light source 4 is additionally disposed at the center of the base material 2 and the light transmitting cover 6 further includes the central protrusion 10 b having an elliptical cross section facing the light source 4 at the center. doing. With such a configuration, in addition to the side and back sides of the lamp device 1, light can also be supplementary irradiated to the area in front of the central part, and the central area can be lightened supplementary.

According to the second to seventh embodiments described above, as in the first embodiment, it is possible to provide a flat lamp device capable of irradiating from the side surface to the back surface side.

The present invention is not limited to the above embodiment as it is, and at the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of constituent elements disclosed in the above embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components in different embodiments may be combined as appropriate.
For example, the number and type of light sources are not particularly limited, and the operation of the present invention can be applied to light sources having strong directivity in the forward direction. Although the whole of the light transmission cover is formed to have a transmittance of 80% or less, the present invention is not limited to this, and at least a portion of the projection may be formed to have a transmittance of 80% or less.

Claims

Flat base material,
A plurality of light sources disposed in a peripheral area on the substrate and having a light distribution with high directivity in the normal direction;
And a translucent cover covering the light source,
The flat lamp device as claimed in claim 1, wherein the light transmitting cover has a hollow protrusion that faces the at least part of the light source and protrudes in a direction away from the base material.
The flat lamp device according to claim 1, wherein a transmittance of at least a protrusion of the light transmitting cover is 80% or less.
The flat type lamp device according to claim 1 or 2, wherein the projection is formed in a longitudinally long cross-sectional shape in which the height in the normal direction of the base material is higher than the width in the radial direction.
The protrusion of the light transmission cover has a distance from the base to the highest point of the light transmission cover h, the cross section of the protrusion is a diameter from the intersection of the contour and a portion inside the light source of the substrate to the light source Let di 0 be the directional distance, and d 0 be the radial distance to the light source from the intersection of the contour of the projection and the portion of the base outside the light source,
(H / di)> 1 or (h / d0)> 1
The flat type lamp device according to claim 3.
2. The light source according to claim 1, wherein a part of the light source is arranged in a circle in a peripheral area on the base material, and a protrusion is formed in the light transmitting cover in an annular shape facing the peripheral area of the base material. Flat lamp device as described.
The flat lamp device according to claim 1, wherein the light source is a plurality of point light sources, and the light transmitting cover has a vertically elongated protrusion covering each of the light sources.
The flat lamp device according to claim 5, wherein the protrusion has an elliptical cross-sectional shape.
The flat lamp device according to claim 5, wherein the protrusion has a rectangular cross-sectional shape.
9. The flat lamp device according to claim 8, wherein the area of the protrusion facing the light source is formed thicker than the other areas.
The flat type lamp device according to claim 8, wherein unevenness is formed in a region of the protrusion facing the light source.
The flat lamp device according to claim 1, wherein a part of the light source is arranged in a circle in a peripheral region of the base, and the projections are connected in a circle.
The flat lamp device according to claim 1, wherein the light sources are dispersedly disposed on the substrate, and the protrusions cover the individual light sources.