JP2002367406A - Ring-like led lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring-like LED lighting system, capable of uniformly and entirely illuminating an area to be lighted and suppressing the illuminance fluctuation resulted from heating of LED. SOLUTION: This ring-like LED lighting system 1 comprises a ring-like diffusion plate 3 having substantially a semicircular section, and the light from LED 6, arranged without clearance in a closely fitted state in a ring shape, is directly radiated to the inside surface 33 of the ring-like diffusion plate 3. An LED substrate 5 mounted with the LED 6 is mounted on the surface of a ring-like body plate 2, made of highly heat conductive aluminum in a closely fitted state. Since the whole circumferential curved surface of the semicircular sectional ring-like diffusion plate functions as a light emitter for radiating the light to all directions, the area to be lighted can be illuminated uniformly. Furthermore, since the heat generated by the LED 6 is efficiently released to the outside from the LED substrate 5 via the aluminum-made ring-like body plate 2, the illuminance fluctuations, resulting from the overheating of the LED 6 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped LED lighting device for illuminating an object in an image processing device or the like.

[0002]

2. Description of the Related Art A ring-shaped illumination device used as an illumination light source for an image processing device or the like is typically a ring-type fluorescent lamp or a ring-shaped LED in which a ring-shaped fluorescent lamp and an LED are arranged in a ring shape. An illumination device having a configuration in which a diffusion plate is attached is known.

Here, in the illumination by a ring-type fluorescent lamp,
Since light is emitted in all directions from the entire circumference of the fluorescent tube,
Not only the target of the image processing, but also the surroundings of the target can be brightened evenly. For this reason, since light does not concentrate on a part of the object, the entire view of the object can be imaged. In addition, due to the fluorescent powder applied to the inner peripheral surface of the glass tube,
The light diffusion effect is high, and a uniform illumination effect can be obtained.

[0004] However, the ring-type fluorescent lamp has the following disadvantages. First, since the electrodes are arranged inside the ring-shaped fluorescent tube, a dark portion where no light is generated always occurs in a part of the fluorescent tube in the circumferential direction. For this reason, the object may be partially darkened, which may be inconvenient in image processing. Also,
There is a problem that the life is short. Further, since the fluorescent tube is made of glass, it has a drawback that it is susceptible to vibration and easily broken. Furthermore, there is a disadvantage that the wavelength of light cannot be controlled in accordance with the object.

On the other hand, in the case of illumination comprising LEDs arranged in a ring, the life span is long, maintenance-free, high in earthquake resistance, hard to break, and the arrangement of the LEDs is devised to improve the fluorescent tube. There is an advantage that the generation of a dark portion as described above can be avoided. Furthermore, there is an advantage that the emission color (R, G, B, W) of the LED can be selected according to the object, and the object can be irradiated with light at an optimal wavelength.
In addition to this, there is an advantage that the light of the LED has a single wavelength and a high directivity, and the object can be locally irradiated with light.

[0006]

However, the conventional annular LED lighting device has the following problems to be solved. First, in the LED lighting device, since the light source is an aggregate of a plurality of LEDs, uneven brightness occurs. A flat diffuser is used to interpolate this uneven brightness.
Has local directivity, which results in local illumination. For this reason, it is not possible to uniformly and brightly illuminate the entire space where the object exists.

[0007] Even if the intensity is not as high as that of a fluorescent lamp, the illuminance fluctuates due to heat generation, so that it is difficult to maintain a constant illuminance when used continuously.

Further, since the unit price of the high-brightness LED is high,
It is difficult to manufacture an inexpensive ring-shaped LED lighting device.

[0009] The object of the present invention is to solve the above problems.
An object of the present invention is to realize a ring-shaped LED lighting device having both advantages of a conventional ring-type fluorescent lamp and a ring-shaped LED lighting device.

[0010]

In order to solve the above-mentioned problems, a ring-shaped LED lighting device according to the present invention has a ring-shaped light emitting source and a ring-shaped diffusion plate having a substantially semicircular cross-sectional shape. The ring-shaped light source includes a plurality of LEDs arranged in a ring shape, and the ring-shaped diffusion plate is configured such that light from the ring-shaped light source directly irradiates a curved inner peripheral surface thereof. It is characterized by being arranged in.

In the present invention, since the diffusion plate having a substantially semicircular cross-sectional shape is used and the light from the LED is directly radiated to the inner peripheral surface, the uneven brightness of each LED can be interpolated. The directivity of the LED can be suppressed. Therefore, the illumination target space can be uniformly illuminated as a whole.

Here, the ring-shaped light emitting source is a ring-shaped light source.
If a configuration is provided in which the LEDs are arranged on the surface of the ring-shaped LED substrate at predetermined intervals in a radial direction and a circumferential direction on the surface of the ring-shaped LED substrate, a conventional ring-shaped lighting device using a fluorescent lamp is adopted. It is possible to avoid the occurrence of such a dark portion as occurs in the fluorescent lamp electrode portion.

In addition, a heat-dissipating ring-shaped main body plate is provided, and an exposed portion from which a conductive pattern is removed is formed on the back surface of the ring-shaped LED substrate, and the exposed portion is in close contact with the ring-shaped main body plate. If a configuration in which a ring-shaped LED substrate is attached to the ring-shaped main body plate so as to be
The heat of D can be efficiently released to the outside through the ring-shaped main body plate. As a result, the LED caused by the heat generation of the LED
It is possible to suppress the occurrence of uneven illuminance of itself.

In the present invention, the ring-shaped diffusion plate may be a milk-white acrylic resin molded product. Further, the ring-shaped main body plate can be made of aluminum.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ring-shaped LED lighting device to which the present invention is applied will be described below with reference to the drawings.

FIG. 1 is a side view and a front view of a ring-shaped LED lighting device of this embodiment. As shown in this figure, the ring-shaped LED lighting device 1 of the present example has a ring-shaped main body plate 2 and a ring-shaped diffusion plate 3 attached thereto. The power supply cable 4 is drawn out. The ring-shaped main body plate 2 is made of aluminum having high heat dissipation, and the ring-shaped diffusion plate 3 is a milky white acrylic resin molded product.

FIG. 2 is a view of the ring-shaped LED lighting device 1 taken along line A-.
It is sectional drawing of the part cut | disconnected by the A 'line. As can be seen from this figure, the ring-shaped main body plate 2 has a ring-shaped end plate portion 21.
And an inner peripheral side plate portion 23 and an outer peripheral side plate portion 24 which stand vertically from a position slightly inside the inner and outer peripheral edges of the surface 22. A ring-shaped LE is provided on the surface 22 between the side plate portions 23 and 24.
The D board 5 is attached in close contact, and a large number of LEDs 6 are mounted on the surface of the ring-shaped LED board 5.

A ring-shaped inner cover 8 and a ring-shaped outer cover 9 are fixed to the inside and outside of the inner peripheral side plate portion 23 and the outer peripheral side plate portion 24 of the ring-shaped main body plate 2 by screws 7 respectively. Instead of using fasteners such as screws, a male thread is formed on one side and a female thread is formed on the other side, and the ring-shaped inner cover 8 and Of course, the ring-shaped outer cover 9 may be fixed.

In this embodiment, a ring-shaped flange 81 slightly projecting outward in the radial direction is provided at the tip of the ring-shaped inner cover 8.
And a ring-shaped flange 91 slightly protruding inward in the radial direction is also formed at the tip of the ring-shaped outer flange 9. The inner peripheral edge portion 31 and the outer peripheral edge portion 32 of the ring-shaped diffusion plate 3 are respectively located between the distal end surface 23a of the inner peripheral side plate portion 23 and the ring-shaped flange 81, and between the distal end surface 24a of the outer peripheral side plate portion 24 and the ring-shaped flange. 91
Thus, the ring-shaped diffusion plate 3 is attached and fixed to the ring-shaped main body plate 2 side.

The ring-shaped diffusion plate is connected to the ring-shaped main body plate 2.
It is also possible to use a screw-in type for the mounting structure.

FIG. 3 is a plan view showing the ring-shaped diffusion plate 3.
It is a side view and a sectional view. Ring-shaped diffusion plate 3 of this example
Has a cross-sectional shape in which a tube having a cylindrical cross section is halved. That is, it has a substantially semicircular cross-sectional shape. The ring-shaped diffusion plate 3 having this shape can be obtained, for example, by vacuum-forming a translucent milky white acrylic flat plate. In this case, heat resistance of about 100 ° C. is obtained. It is preferable that the curved inner peripheral surface 33 of the ring-shaped diffusion plate 3 is subjected to a surface treatment so as to be roughened to enhance the diffusion effect.

Next, FIG. 4 is an explanatory view showing an arrangement state of the LEDs 6 mounted on the ring-shaped LED board 5. As shown in FIG. As shown in this figure, a large number of LEDs 6 are formed concentrically at constant intervals and densely in three rows in the circumferential direction.
In the figure, the outermost row is a row of circuit resistors 8. By arranging the LEDs 6 in this way, the entire ring-shaped inner peripheral surface 33 of the ring-shaped diffusion plate 3 can be uniformly irradiated with the light emitted from the LEDs, so that a dark portion does not occur partially.

Here, in this example, the ring-shaped LED substrate 5
, The LED mounting surface 51 (see FIG. 2)
The conductive pattern is excluded from the surface on the opposite side. The exposed back surface 52 of the ring-shaped LED substrate is attached in close contact with the front surface 21 of the ring-shaped main body plate 2 made of aluminum having high thermal conductivity, and the heat generated by the LED 6 is transferred from the LED substrate 5 to the aluminum ring-shaped ring. The ring-shaped main body plate 2 is efficiently transmitted to and released from the ring-shaped main body plate 2 to the outside.

The ring-shaped LED of the present embodiment thus configured
In the illuminating device 1, as shown in FIG. 5A, light from a plurality of LEDs 6 closely arranged without gaps is directly applied to the inner peripheral surface 33 of the ring-shaped diffusion plate 3 having a semicircular cross section. As a result, the uneven brightness of the light of each LED is interpolated by the ring-shaped diffusion plate 3, and the diffusion plate itself can be brought into a state of a luminous body. Since this luminous body has a semicircular outer peripheral curved surface as shown in the figure, light can be emitted uniformly in all directions in the illumination direction (the lower side in the figure).

Further, as described above, since a large number of LEDs 6 are densely arranged in a ring shape without any gap, the entire inner peripheral surface of the ring-shaped diffusion plate can be irradiated with LED light. It is possible to avoid the occurrence of a light source dark portion that occurs.

Next, the LED 6, which is a heat source, has a characteristic that the illuminance is not stable due to its own heat. In this example, the ring-shaped main body plate 2, the ring-shaped LED substrate 5 attached thereto, and the ring-shaped diffusion plate 3, the LED 6 is sealed. Therefore, the temperature of the internal space may increase, and it may be difficult to maintain a constant illuminance of the LED 6 as the light emitting source.

However, the present embodiment employs a configuration in which the back surface of the ring-shaped LED substrate 5 is exposed as described above, and this is directly adhered to the aluminum body plate 2 having high thermal conductivity. Therefore, as shown in FIG.
The heat generated by the LED 6 is efficiently released to the outside from the LED board 5 through the main body plate 2. Therefore, it is easy to keep the illuminance of the LED 6 constant.

[0028]

As described above, in the ring-shaped LED lighting device of the present invention, the disadvantages of the conventional ring-shaped LED lighting device can be eliminated, and the entire illumination area can be uniformly illuminated. Moreover, since the heat generated by the LED can be efficiently emitted to the outside, the illuminance fluctuation of the LED can be suppressed. In addition, it is possible to realize an inexpensive lighting device as a whole as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a side view and a front view showing an example of a ring-shaped LED lighting device to which the present invention is applied.

FIG. 2 is a cross-sectional view of a portion of the lighting device of FIG. 1 taken along line AA ′.

FIG. 3 is a plan view, a side view, and a cross-sectional view showing the ring-shaped diffusion plate of FIG. 1;

FIG. 4 is an explanatory diagram showing an arrangement of the LEDs in FIG. 1;

5A and 5B are an explanatory view showing an operation effect of a ring-shaped diffusion plate in the lighting device of FIG. 1 and an explanatory view showing an operation effect of a heat dissipation structure of the lighting device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ring-shaped LED lighting device 2 ring-shaped main body plate 3 ring-shaped diffusion plate 33 inner peripheral surface 5 ring-shaped LED substrate 52 exposed substrate back surface 6 LED

[Procedure amendment]

[Submission date] June 25, 2001 (2001.6.2)
5)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

Claims (6)

[Claims] 1. A ring-shaped light source, and a ring-shaped diffusion plate having a substantially semicircular cross-sectional shape, wherein the ring-shaped light source includes a plurality of LEs arranged in a ring shape.
D. The ring-shaped LED lighting device, wherein the ring-shaped diffusion plate is arranged so that light from the ring-shaped light emitting source is directly radiated to a curved inner peripheral surface thereof. 2. The ring-shaped light emitting source according to claim 1, wherein the ring-shaped light source includes a ring-shaped LED substrate, and the LEDs are arranged on a surface of the ring-shaped LED substrate at predetermined intervals in a radial direction and a circumferential direction. A ring-shaped LED lighting device. 3. The ring-shaped LED substrate according to claim 1, further comprising: a heat-dissipating ring-shaped main body plate, wherein the ring-shaped LED substrate has an exposed portion on a back surface of which a conductive pattern is removed, and the exposed portion is formed of the ring. In close contact with the body plate
The ring-shaped LED lighting device, wherein the ring-shaped LED substrate is attached to the ring-shaped main body plate. 4. The ring-shaped main body plate according to claim 3, wherein the ring-shaped main body plate is perpendicular to a ring-shaped end plate portion to which the ring-shaped LED board is attached, and an inner peripheral edge and an outer peripheral edge portion of the ring-shaped end plate portion. An inner peripheral side plate portion and an outer peripheral side plate portion that are standing are provided, and an inner peripheral edge portion and an outer peripheral edge portion of the ring-shaped diffusion plate are attached to the ring-shaped tip surfaces of the inner peripheral side plate portion and the outer peripheral side plate portion. Ring-shaped LE
D lighting device. 5. The ring-shaped LED lighting device according to claim 1, wherein the ring-shaped diffusion plate is a milk-white acrylic resin molded product. 6. The ring-shaped LED lighting device according to claim 3, wherein the ring-shaped main body plate is made of aluminum.