JP7037474B2 - Illuminator - Google Patents

Description

The present invention relates to an illuminating device, for example, an illuminating device for an operation switch of an operation panel of an in-vehicle device.

As an illumination device of this type, for example, the one described in Patent Document 1 below is known. This Patent Document 1 is provided with a light emitting diode mounted on a circuit board, a tubular partition wall surrounding the light emitting diode, and a transmissive portion arranged on the front side of the light emitting diode and transmitted by light emission of the light emitting diode. A front member and a lighting device including the front member are described.

Japanese Unexamined Patent Publication No. 2010-271557

In the illumination device as described above, one light emitting diode illuminates one transmissive portion, and there is a problem that the center of the transmissive portion is bright and the periphery is dark, resulting in uneven brightness. In addition, there is a problem that heat is concentrated. As another configuration, a configuration in which a plurality of light emitting diodes are dispersedly arranged to illuminate one transmissive portion is also conceivable. According to this, heat concentration and uneven brightness can be reduced. However, there is a problem that the light is absorbed by the light-shielding portion and the utilization efficiency of the light is lowered.

The present invention has been made in view of such a point, and an object of the present invention is to provide an illumination device capable of reducing luminance unevenness of a transmitting portion, preventing heat concentration of a light emitter, and increasing light utilization efficiency. And.

A circuit board on which each of a front member having a transmissive portion at a predetermined position, a plurality of light emitters facing the transmissive portion and illuminating the transmissive portion from the back surface side of the front member, and the plurality of light emitters are mounted. A lighting device including a pair of partition walls surrounding all of the light emitting bodies, and the plurality of the light emitting bodies are distributed and arranged in a range wider than the maximum width of the outer shape of the transmitting portion. The inner wall of the partition wall is subjected to reflection treatment to be inclined in a direction extending from the front member to the circuit board, and the circuit board is subjected to reflection treatment around the light emitting body to form a pair of the partitions. The opening located on the front member side formed by the wall includes the transmissive portion inside when viewed from above.

It is possible to make the transmitted brightness of the transmitting portion substantially uniform, prevent heat concentration of the light emitter, and further improve the efficiency of light utilization.

It is a front view of the illumination apparatus which shows 1st Embodiment and 2nd Embodiment of this invention. It is sectional drawing (AA cross section in FIG. 1) of the illumination apparatus in 1st Embodiment. It is an exploded perspective view of the illumination device in 1st Embodiment. It is a table of optical simulation results. It is sectional drawing (AA cross section in FIG. 1) of the illumination apparatus in 2nd Embodiment. It is an exploded perspective view of the illumination device in 2nd Embodiment.

The first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The illumination device includes a plurality of light emitters 3 mounted on the circuit board 1, a partition wall 4 surrounding the plurality of light emitters 3, and a plurality of light emitters 3 arranged on the front side of the plurality of light emitters 3. It includes a front member 6 provided with a transmissive portion 5 that transmits light.

The front member 6 represents the operating state of the in-vehicle acoustic device by punching out and printing the impermeable light-shielding layer 6B on the surface side of the sheet base material 6A made of, for example, a light-transmitting synthetic resin (for example, polycarbonate resin). Part 5 is formed, and a colorless and transparent protective layer 6C is printed on the surface side of the impermeable light-shielding layer 6B. It should be noted that the display content by printing is not limited to the one shown in the figure, but differs depending on the operation content and the type of device.

The plurality of illuminants 3 (for example, LEDs) are spaced between each illuminant (first illuminant 3A and second illuminant 3B and third illuminant 3C) so as to face the transmissive portion 5. It is provided with an opening. Further, the width W3 of the distributed arrangement of the plurality of light emitters 3 is larger than the maximum width W1 of the outer shape of the transmissive portion 5. In the present embodiment, the number of light emitting bodies is three, but the number of light emitting bodies may be any number as long as it is two or more. Further, in the present embodiment, when the transmissive portion 5 is projected onto the circuit board 1, the number of light emitters arranged outside the outer shape of the projected transmissive portion 5 is two, but the projected transmissive portion is used. The number of light emitters arranged outside the outer shape of the portion 5 may be any number as long as it is one or more.

The partition wall 4 is made of a white synthetic resin having high reflectance and light-shielding property, and has an inclination between the front member 6 and the circuit board 1 in a direction extending from the front member 6 to the circuit board 1. Further, the width W2 of the opening located on the front member 6 side of the partition wall 4 is larger than the maximum width W1 of the outer shape of the transmissive portion 5 and smaller than the width W3 of the distributed arrangement of the light emitters 3. Further, when viewed from above, the opening includes the transmissive portion inside.

In the circuit board 1, the periphery of the light emitting body 3 is coated with a white paint, and a layer 2 of the white paint is formed on the circuit board to increase the reflectance.

When the plurality of light emitting bodies 3 emit light, the transmissive portion 5 of the illumination device configured in this way directs the light toward the front member 6 side and is transilluminated. The light directed toward the front member 6 was repeatedly reflected by the light transmitted directly through the sheet base material 6A and transmitted and illuminated, and the inner wall of the partition wall 4 and the layer 2 of the white paint on the circuit board 1. Later, there is light that passes through the sheet base material 6A and is transmitted and illuminated.

The light transmitted and illuminated after repeated reflections of light is diffused by repeating the reflections, and the transmitted brightness of the transmitting portion 5 is made uniform.

In this way, the plurality of light emitters 3 mounted on the circuit board 1, the partition wall 4 arranged so as to surround the periphery of the plurality of light emitters 3, and the plurality of light emitters 3 arranged on the front side of the plurality of light emitters 3. In the illumination device provided with the front member 6 provided with the transmissive portion 5 transmitted by the light emitted from the light emitting body 3, the width W3 of the distributed arrangement of the plurality of light emitters 3 is made larger than the width W1 of the outer shape of the transmissive portion 5. The partition wall 4 is made of a resin having high reflectance and is inclined in a direction extending from the front member 6 to the circuit board 1, and the periphery of the plurality of light emitters 3 of the circuit board 1 is covered with white paint to cover the white paint layer 2. The width W2 of the opening located on the front member 6 side of the partition wall 4 is larger than the maximum width W1 of the outer shape of the transmissive portion 5, and the width W3 of the distributed arrangement of the plurality of light emitters 3 is larger than the maximum width W1. Since the opening is made smaller and the opening includes the transmitting portion 5 inside when viewed from above, the light that illuminates the transmitting portion 5 directly passes through the sheet base material 6A and is transmitted and illuminated. In addition, after the light reflection is repeatedly diffused by the inner wall of the partition wall 4 and the layer 2 of the white paint on the circuit board 1, the light that passes through the sheet base material 6A and is transmitted and illuminated is added, and the transmitting portion 5 is added. It is possible to make the transmitted brightness of the light substantially uniform and further improve the efficiency of light utilization. In addition, heat concentration can be prevented.

FIG. 4 shows the result of confirming the difference in illuminance between the presence / absence of the angle of the partition wall 4 and the presence / absence of the layer 2 of the white paint by optical simulation. The optical simulation software used was SPEOS from OPTIS.

As shown in FIG. 4, in the case of a pattern in which the white paint layer 2 and the partition wall 4 of the present embodiment are inclined, in addition to the light transmitted directly through the sheet base material 6A and illuminating the partition wall 4, the inner wall of the partition wall 4 is used. And, since the light repeatedly reflected by the white paint layer 2 on the circuit board 1 is added to the light illuminating the transmission portion, the result is that the illuminance is higher than that of other patterns. Therefore, it can be said that the present embodiment can improve the efficiency of light utilization. It should be noted that the illuminance of the pattern in which the partition wall 4 is inclined without the layer 2 of the white paint and the pattern in which the partition wall 4 is not inclined with the layer 2 of the white paint are hardly changed. On the other hand, in the pattern with both measures, a significant increase in illuminance can be seen.

A second embodiment of the present invention will be described with reference to FIGS. 1, 5, and 6. FIG. 5 is a cross-sectional view of the main illumination device according to the second embodiment. The illumination device in the second embodiment has a cover layer 7 made of a resin material containing a filler having a high light reflectance, instead of the layer 2 of the white paint formed on the circuit board 1 in the first embodiment. Other than that, it has the same configuration as that of the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description of the same functional parts as those in the first embodiment will be omitted.

The circuit board 1 has a high reflectance by arranging a cover layer 7 having a high reflectance on the circuit board 1 so as to cover the plurality of light emitters 3.

When the plurality of light emitting bodies 3 emit light, the transmissive portion 5 of the illumination device configured in this way passes through the cover layer 7 and then faces the front member 6 side and is transilluminated. For the light directed toward the front member 6, the light that directly passes through the sheet base material 6A and is transmitted and illuminated, and the light is repeatedly reflected by the inner wall of the partition wall 4 and the cover layer 7 on the circuit board 1, and then the sheet. There is light that passes through the base material 6A and is transmitted and illuminated.

The light transmitted and illuminated after repeated reflections of light is scattered by repeating the reflections, and the transmitted brightness of the transmitting portion 5 is made uniform.

In this way, the plurality of light emitters 3 mounted on the circuit board 1, the partition wall 4 arranged so as to surround the periphery of the plurality of light emitters 3, and the plurality of light emitters 3 arranged on the front side of the plurality of light emitters 3. In the illumination device provided with the front member 6 provided with the transmissive portion 5 transmitted by the light emitted from the light emitting body 3, the width W3 of the distributed arrangement of the plurality of light emitters 3 is made larger than the width W1 of the outer shape of the transmissive portion 5. The partition wall 4 is made of a resin having a high reflectance, and the cover layer 7 is made of a resin material having a high reflectance so as to be inclined in a direction extending from the front member 6 to the circuit board 1 so as to cover the light emitting body 3. The width W2 of the opening located on the front member 6 side of the partition wall 4 is larger than the maximum width W1 of the outer shape of the transmissive portion 5, and the width of the distributed arrangement of the plurality of light emitters 3 is larger than the maximum width W1. Since it is smaller than W3 and the opening includes the transmitting portion 5 inside when viewed from above, the light that illuminates the transmitting portion 5 directly passes through the sheet base material 6A and is transmitted and illuminated. In addition to the light, the inner wall of the partition wall 4 and the cover layer 7 on the circuit board 1 repeatedly diffuse the reflection of the light, and then the light transmitted through the sheet base material 6A and illuminate the transmitted portion 5 is added. It is possible to make the transmitted brightness of the light substantially uniform and further improve the efficiency of light utilization. In addition, heat concentration can be prevented.

1 Circuit board 2 White paint layer 3 Multiple light emitters 3A First light emitter 3B Second light emitter 3C Third light emitter 4 Partition wall 5 Transmissive part 6 Front member 6A Sheet base material 6B Impermeable light shielding Layer 6C Colorless and transparent protective layer 7 Cover layer

Claims (5)

A front member having a transmissive part at a predetermined position,
A plurality of light emitters facing the transmissive portion and illuminating the transmissive portion from the back surface side of the front member,
A circuit board on which each of the plurality of light emitters is mounted,
An illumination device comprising a pair of partition walls surrounding all of the plurality of light emitters.
The plurality of the light emitters are dispersedly arranged in a range wider than the maximum width of the outer shape of the transmissive portion.
The inner wall of the partition wall is subjected to a reflection treatment so as to have an inclination in a direction extending from the front member to the circuit board.
The circuit board is subjected to a reflection treatment around the light emitter, and the circuit board is subjected to a reflection treatment.
An illumination device having an opening formed by the pair of partition walls on the front surface member side and having a width smaller than the distributed width of the plurality of light emitters. The illumination device according to claim 1, wherein the inner wall of the partition wall is subjected to a reflection treatment by forming the entire partition wall with a material that reflects light. The illumination device according to claim 1, wherein the inner wall of the partition wall is subjected to a reflection treatment by forming the inner wall of the partition wall with a reflective member having a higher reflectance than the base material of the partition wall. One of claims 1 to 3, wherein the circuit board is subjected to a reflection treatment by applying a coating material having a higher reflectance than the substrate of the circuit board to the surface of the circuit board to cover the surface of the circuit board. The illumination device described. The circuit board is reflected by covering the light emitter and the circuit board from above with a cover layer formed on the surface of the circuit board with a resin material having a higher reflectance than the base material of the circuit board. The illumination device according to any one of claims 1 to 3, which is characterized.

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