JP3157161U - Lighting device - Google Patents

Abstract

An LED illumination device that irradiates a wide range and eliminates chromatic aberration and glare is provided. A substrate made of a light transmissive material and having a plurality of light emitting portions arranged in the axial direction of a straight tube container is provided inside. Each of the plurality of light emitting units includes a light emitting diode and a lens, and the light emitting diodes are arranged linearly on the substrate. Corresponding lenses are arranged so as to be shifted in the horizontal direction with respect to the arrangement direction of the light emitting diodes, and at least one of the straight tube container made of the lens and the light transmitting material is blasted. [Selection] Figure 1

Description

The present invention relates to an LED lighting device using a light emitting diode as a light source.

The fluorescent lamp for illumination is a main illumination device generally used in offices, stores, homes, and the like, and has become a standard illumination device because it is easy to install and handle.

However, fluorescent lamps require a residual heat device and a ballast when they are turned on, and low pressure gas needs to be sealed in the fluorescent lamp tube, so pressure resistance and airtightness are required, so the selection of the material of the container is limited. There is also a limit to the size and length of fluorescent lamp tubes that can be designed. Furthermore, since the discharge is used, the length of the tube that emits light uniformly is limited. In addition, it takes time and effort to prevent glass fragments from being scattered when the fluorescent lamp is broken, and to prevent scattering.

On the other hand, lighting of light emitting diodes has an advantage of low power and long life because of small heat loss. Recently, lighting devices using light emitting diodes (LEDs) have been widely used.

However, the LED is effective for illuminating a narrow range brightly because of its high luminance and directivity, but it is not suitable for illuminating a wide area or the entire floor surface of a living space with uniform illumination. Therefore, an LED lighting device must be laid all over the ceiling, and a large number of LEDs are required. The cost will increase accordingly.

Therefore, recently, due to the ease of handling during manufacture and use, a conventional fluorescent lamp tube type lighting device having LEDs arranged therein has been developed.

JP 2004-30929 A JP 2009-54405 A

As described above, the LED light has high brightness and directivity, and when installed so as to illuminate the floor surface, the light is applied to a region directly below the LED lighting device, that is, a region having almost the same area as the LED is disposed. Will be irradiated. That is, only the area directly under the LED lighting device is bright and the other areas are dark. Therefore, it is difficult to use as a general lighting device other than a special purpose.

Therefore, in order to avoid spotlight-like illumination and uniformly illuminate a predetermined wide range, an illumination device using a plurality of LEDs has been developed, but it is still insufficient as a device for uniformly illuminating.

On the other hand, several techniques have already been introduced as fluorescent lamp tube type LED lighting devices as described above. However, as usual with this type of illumination, when it is desired to obtain illumination of a predetermined area by design, the floor must be widely illuminated by arranging a plurality of fluorescent lamp tubes parallel to the axis of the cylindrical light source.

For example, for indoor lighting, it is necessary to uniformly illuminate a wide area, and to eliminate the contours of the illumination area and the non-illumination area to continuously change the brightness. However, it cannot be said that these problems have been solved.

Currently, LED lighting for living spaces is required to supply lighting that makes it easy for people to see things and feel comfortable by solving the above drawbacks.

Furthermore, since the white LED used for illumination uses light of two wavelengths of blue (470 nm) and yellow (near 570 nm), there is a problem that chromatic aberration occurs due to light refraction when using a single lens. Need to be resolved.

In addition, in these illuminations having high luminance, it is also necessary to eliminate the glare (glare) of illumination light that causes discomfort to humans.

The LED lighting device of the present invention is a straight tube container having an electrode at an end thereof, and includes a substrate in which a plurality of light emitting units are arranged in the axial direction of the straight tube container inside a light transmissive material. In the illumination device, each of the plurality of light emitting units includes a light emitting diode and a lens, and the plurality of light emitting diodes are linearly arranged in a longitudinal direction on the substrate, and the corresponding lens is arranged with respect to the arrangement direction of the light emitting diodes. Disperse the transmitted light by blasting the lens surface or the straight tube container surface made of a light-transmitting material, which are alternately shifted in the left-right and lateral directions, and through which the light emitted from the LED is transmitted. It is characterized by.

Further, as another aspect of the present invention, in the LED lighting device, the light emitting units having the same configuration as described above are arranged in the same manner, and between the lens and the straight tube container made of a light transmissive material. Further, it is characterized in that transmitted light is dispersed by inserting a light transmissive member having a blasted surface on the surface thereof.

In the present invention, when the plane perpendicular to the axis of the cylindrical light source is considered, the light from the light source is spread not only in the vertical direction but also to the left and right. In addition, the LED lighting device of the present invention is housed inside Since the light-emitting diodes are arranged in a straight line on the surface of the substrate and the optical axes of the lenses covering each light-emitting diode are alternately shifted to the left and right with respect to the light-emitting diode arrangement line, the light-emitting diodes are emitted. When the transmitted light passes through the lens, it shifts to the lens side, and the light emitted from the lighting device after passing through the straight tube container is diffused if a plane perpendicular to the axis of the straight tube container is considered. As a result of being radiated toward the left or right side, it spreads in a wide range not only in the downward direction in the plane but also in the lateral direction.

Furthermore, by blasting a straight tube container of a lens or a light transmissive material used in the LED lighting device of the present invention, or by blasting a light transmissive member and inserting it into the straight tube container, Dispersion of light from the processed surface can eliminate chromatic aberration and reduce glare unique to the LED lighting device.

1 is an external view of an LED lighting device according to the present invention. It is a top view of the base part of the LED lighting apparatus by this invention. It is AA sectional drawing of the base part of the LED lighting apparatus by this invention. It is the top view explaining the structure of a lens, a front view, a bottom view, and sectional drawing. It is a circuit diagram explaining the structure of a LED drive circuit. It is a figure explaining the light distribution by the difference in the position of the lens with respect to LED. It is a conceptual diagram of a blast process. It is a figure which shows the result of having measured the illumination intensity distribution of the LED lighting apparatus.

[Example]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the LED lighting device 1 according to the present invention includes a straight tube container 5 having an electrode at an end portion, and includes a base portion 20 and a plurality of light emitting portions 10 therein.

As shown in FIG. 2, a plurality of light emitting units 10 are arranged in a row on a long substrate 21 constituting the base unit 20.

As shown in FIG. 3, the light emitting unit 10 includes a light emitting diode (LED) 11 and a lens 12. Here, the base portion 20 includes a substrate 21, a lens holder 22, and the light emitting portion 10.

In each light emitting unit 10 shown in FIG. 3, the center of the LED 11 and the center of the lens 12 are arranged so as to be shifted. That is, with respect to the LEDs 11 arranged in a line on the substrate 21, the lenses 12 are installed so as to be alternately shifted to the left and right, and as a result, are arranged in a staggered manner.

Hereinafter, the LED 11 and the lens 12 as main components of the LED lighting device 1 will be described in detail.

The LED 11 is composed of a white LED that constitutes the light source of the LED lighting device 1. In the present embodiment, surface-mounted LEDs are used, and each LED 11 is surface-mounted on one surface of the substrate 21.

The lens 12 is for refracting the light emitted from the LED 11, and in this embodiment, the curved surface of the lens is constituted by an aspheric lens constituting a paraboloid. By making the lens surface a parabolic surface, the light emitted from the LED 11 can be efficiently refracted and diffused.

The structure of the lens 12 will be described with reference to FIG. FIG. 4A shows a plan view, FIG. 4B shows a front view, FIG. 4C shows a bottom view, and FIG. 4D shows a cross-sectional view. That is, the lens 12 includes a main body portion 31 and a flange portion 32.

The main body 31 is a portion having a lens function, and has a parabolic shape as a lens surface on the upper end side of a short columnar member. Further, a hole (concave portion) 33 for accommodating the LED 11 is formed on the bottom surface of the main body 31.

As shown in FIG. 3, the flange portion 32 is a portion that is sandwiched between the substrate 21 and the lens holder 22 to fix the lens 12, and extends radially outward from the lower end portion of the main body portion 31. It is formed so as to protrude like a bowl over the entire circumference.

The lens holder 22 shown in FIG. 3 is a member for holding the lens 12 in a predetermined position, and the flange portion 32 is sandwiched between the substrate 21 and the lens holder 22. In this embodiment, the lens 12 is slidable on the substrate, and the amount of shift (shift amount) can be finely adjusted. The lens 12 is held by screwing it at the periphery of the lens holder 22.

The straight tube container 5 of the LED lighting device 1 shown in FIGS. 1 to 4 has a circular tube shape with a diameter of 27 mm and a length of about 1200 mm. And an edge part is covered with the nozzle | cap | die 13 and the electrode 14 is provided as needed.

The dimensions of the lens 12 are such that the diameter of the main body 31 is 10 mm, and the length from the bottom surface of the main body 31 (the light emitting surface of the LED 11) to the apex of the lens paraboloid is 7 mm. The amount of shifting the lens 12 with respect to the LED 11 (shift amount) is 1.2 mm.

Further, 36 LEDs 11 are mounted on the substrate 21. Practically 30 to 40 LEDs can be mounted. Moreover, it is comprised with the printed wiring board in which the wiring for supplying electric power with respect to each LED11 was formed.

The LEDs 11 are mounted in a row on one surface of the substrate 21 constituting the base portion 20 shown in FIG. In addition, a plurality of resistors 41 and a plurality of connectors 42 are mounted on another surface (not shown). On the other surface, wiring for supplying electric power to each LED 11 is provided.

FIG. 5 is a diagram illustrating the configuration of a circuit (LED drive circuit) for supplying power to each LED 11.

In the board | substrate 21, several LED11 is divided into groups and each group is wired in parallel. As shown in the figure, in each group, a plurality of LEDs 11 (11a to 11d) and a resistor 41 are connected in series, and a circuit is configured to supply a predetermined voltage via a connector 42. is doing. The connector 42 is provided in order to facilitate wiring of the power supply between the substrates.

In this embodiment, an acrylic resin is used as a light transmissive material constituting the straight tube container 5. As such a light-transmitting material, polycarbonate, glass material and other materials can also be used. In the strict sense, the material absorbs a part of light and transmits most of the material, and also has a property of diffusing light.

The straight pipe container 5 was blasted. Conventional LED lighting devices often use not only a transparent cover but also a so-called diffusion cover that transmits and diffuses light. In this embodiment, the surface of a straight tube container 5 made of transparent acrylic resin is blasted. I used something. In the blasting process of the inner surface of the straight pipe container 5, the straight pipe part 5 was halved to form the straight pipe container 5 after processing. For reference, FIG. 7 shows a processing state of blasting.

In the blasting process of this example, the alumina particles # 100 to # 220 were projected to produce unevenness with a depth of 5 to 20 μm on the acrylic resin.

As shown in FIG. 7, if the particles are strongly projected with a predetermined width around one point of the circumference of the straight tube container 5, the blast is continuously weakened away from the width and going to the outer edge. Such blasting can be performed while moving along a circumferential ridge line parallel to the tube axis.

Accordingly, a strip-shaped blasting process having a constant width parallel to the central axis of the straight tube container 5 can be performed, and an effect that the light diffusion effect acts strongly near the center line of the belt and becomes weaker toward the periphery.

Moreover, it is also possible to perform blasting directly on the surface of the lens 12, and it is also possible to blast both the straight tube container 5 and the lens 12. As described above, the directivity of the LED illumination light can be weakened and light can be applied to a wide area.

FIG. 6 shows a conceptual diagram of light distribution by the positional relationship of the arrangement of the lens 12 with respect to the LED 11 in the light emitting unit 10. FIGS. 5B and 5C also show the concept of diffusion of illumination light that can be considered when blasting is performed on the straight pipe container 5.

FIG. 6A shows a case where the center line (LED center line) 61 of the LED 11 and the center line (lens optical axis) 62 of the lens 12 are arranged so as to overlap each other.

6 (b) and 6 (c) corresponding to this embodiment, the straight tube container 5 is alternately shifted to the left and right sides so that the lens optical axis 62 does not overlap the LED center line 61. It is a figure which shows the light distribution in the case of accommodating. In addition, in the figure (b) and the figure (c), the direction to shift is right-and-left reverse.

As shown in FIG. 6A, when the LED center line 61 and the lens optical axis 62 are arranged so as to overlap, the optical path and the light distribution are symmetric. On the other hand, when the lens optical axis 62 is shifted to the left side with respect to the LED center line 61 so that the LED center line 61 and the lens optical axis 62 do not overlap as shown in FIG. The light distribution is shifted to the left side in FIG. On the other hand, when the lens optical axis 62 is shifted to the right in FIG. 5C with respect to the LED center line 61, the optical path and light distribution are also shifted to the right.

FIG. 8 is a diagram showing a result of measuring an illuminance distribution on a plane corresponding to a floor surface at a distance of 2 m under illumination of the LED lighting device 1 according to the above embodiment.

In FIG. 8, illuminance data 81 indicates the measurement result of illuminance of the straight tube container 5 of acrylic resin that has not been blasted (shown as transparent in FIG. 8), and illuminance data 82 indicates the straight tube shown in the embodiment. The illuminance measurement result when the acrylic resin of the container 5 is subjected to blasting is shown, and the illuminance data 83 shows the measurement result when the conventional diffusion cover is used.

Regarding the blasting of the member, as another example, in the LED lighting device 1, a light-transmitting member made of acrylic resin matched to the internal shape of the straight tube container 5 is subjected to blasting, and the lens 12 of the light emitting unit 10 is used. The result was a case where the straight pipe container 5 was blasted and was almost the same as the illuminance data 82 of the light distribution comparison shown in FIG.

The operation of the LED lighting device 1 having the configuration of the above embodiment will be described. After the LEDs 11 of the light emitting unit 10 are arranged in a straight line, the lenses 12 corresponding to the respective LEDs 11 are alternately arranged slightly shifted to the left and right sides, so that the light emitted from the LED lighting device 1 can be straight tube 5 Considering a vertical plane that includes a point on the axis, the radiation spreads in that plane.

However, as a result of the lenses 12 being alternately arranged on the left and right, the adjacent light emitting units 10 are mounted at a pitch of about 30 mm with respect to the axial direction of the straight tube container 5, so that each of the surfaces perpendicular to the axis is the same. It's not light. However, as a total, radiated light and diffused light spread substantially evenly in the lateral direction with respect to the axis of the straight tube container 5. It was confirmed that it was visible to human eyes as symmetrically spreading lighting.

According to the illuminating device of the present invention, the lens optical axis is alternately shifted left and right with respect to the LED center line, so that the LED center line and the lens optical axis coincide with each other even though the structure is simple. Thus, a light distribution in which the illuminance is almost uniform over a wide range was obtained compared to the case of the arrangement. Further, since the straight tube container and other members of the light transmitting material were blasted, a more uniform light distribution was obtained in a wide range due to the light diffusion effect.

The white LED used light of two wavelengths, blue (470 nm) and yellow (near 570 nm), but the above blast treatment solved the problem of chromatic aberration of illumination. In addition, glare has been resolved.

As described above in detail, in the above-described embodiment, a plurality of LEDs are arranged in a straight line, and the lens corresponding to each LED is slightly outside the optical axis of the lens with respect to the center of each LED ( In this embodiment, the shift amount is 1.2 mm), so that the light from each LED advances so as to spread outward, and as a result, illumination that is uniformly irradiated over a wider range than before is obtained. I was supposed to be. Therefore, it is possible to illuminate a predetermined illumination target area with a certain level of illuminance with the illumination device of the present invention that can be manufactured at a low cost with a device having a smaller number of LEDs than in the past.

An object of the present invention relates to an illumination device using a LED having high brightness and directivity, and uses a lens arranged one-on-one with the LED, and secures an illumination area of a certain wide area by diffusion and dispersion of light. It is in. Further, spotlight-like illumination is avoided, and the area between the illumination area and the non-illumination area is unclear and continuously changed. The implementation of the present invention has the effect of blurring the boundaries of the illumination area, eliminating chromatic aberration, and reducing glare (glare). It was found that can be supplied.

Although the best embodiment of the present invention has been described, it should be understood that the implementation is not limited to that described above. In the above-described embodiment, the white LED is used as the light emitting unit, but other ones can be used. For example, a red LED, a green LED, or a blue LED can be used for the light emitting unit. In particular, it is considered that the effect of the present invention for eliminating chromatic aberration is alive in illumination using RGB LEDs.

1 LED lighting device (lighting device)
5 Straight tube 10 Light emitting part
11, 11a-11d Light emitting diode (LED)
12, 12a, 12b lens
13 Base 14 Electrode 20 Base
21 Substrate
22 Lens holder
31 Body
32 Flange
33 holes (concave)
41 Resistance
42 Connector
61 LED center line
62 Lens optical axis

Claims (2)

In an illuminating device comprising a substrate in which a plurality of light emitting portions are arranged in the axial direction of the straight tube container inside a straight tube container having an electrode at an end and made of a light transmissive material,
Each of the plurality of light emitting units includes a light emitting diode and a lens,
The plurality of light emitting diodes are linearly arranged on the substrate,
The corresponding lens is arranged by shifting in the horizontal direction with respect to the arrangement direction of the light emitting diodes,
An LED illumination device, wherein transmitted light is dispersed by blasting at least one of the lens and the straight tube container made of a light transmissive material. In an illuminating device comprising a substrate in which a plurality of light emitting portions are arranged in the axial direction of the straight tube container inside a straight tube container having an electrode at an end and made of a light transmissive material,
Each of the plurality of light emitting units includes a light emitting diode and a lens,
The plurality of light emitting diodes are linearly arranged on the substrate,
The corresponding lens is arranged by shifting in the horizontal direction with respect to the arrangement direction of the light emitting diodes,
An LED lighting device, wherein transmitted light is dispersed by inserting a blasted light transmissive member between the lens and the straight tube container made of a light transmissive material.