JP5323472B2 - LED unit and lighting device for dental treatment - Google Patents

Description

  The present invention relates to an LED unit suitable for use in a dental treatment lighting device used for dental treatment, and a dental treatment lighting device.

In the field of dental treatment, an illumination device called a so-called shadowless lamp, which is set so as not to cause a shadow in the illumination area, is used. This type of lighting device includes a linear incandescent light source such as a halogen lamp or a krypton lamp, and a reflecting mirror that reflects light from the incandescent light source toward an irradiation area. A large number of facets are formed therein to control the reflected light so that a shadowless effect is obtained in the irradiated area. In recent years, there has been proposed a shadowless lamp using an LED as a light source instead of an incandescent light source (see, for example, Patent Document 1).
On the other hand, it is possible to increase the amount of light by arranging LEDs corresponding to each reflecting surface around the reflector on which a plurality of reflecting surfaces are formed, and irradiating the light from each LED in the same direction. An LED unit is known (for example, see Patent Document 2).
JP 2006-156074 A International Publication No. 2005/048362 Pamphlet

By adopting the LED unit as the light source of the surgical light, a dental treatment illumination device that can obtain a sufficient amount of irradiation light for use in dental treatment can be realized. However, in dental treatment, the patient's mouth is illuminated with an illumination device. It is necessary to prevent the patient from feeling dazzled by preventing the patient's eyes from being illuminated by light while illuminating.
However, when the dental treatment lighting apparatus is configured by incorporating the LED unit as it is, there is a problem that light is irradiated over a wide range from the mouth to the eyes.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the LED unit and the illuminating device for dental treatment which can make a patient not feel dazzling.

In order to achieve the above object, the present invention comprises a reflector and a pair of LEDs arranged to face each other with a predetermined separation distance across the reflector, and the reflector corresponds to the LED. are then two reflecting surface is formed, each of said reflecting surface, the LED in the center the right under the reference irradiation region is set at a remote reference position by a predetermined distance immediately below the reflected light from the reflector The LED units are formed so as to extend in a direction corresponding to the predetermined separation distance and overlap each other.

Moreover, the present invention is characterized in that in the LED unit described above, a non-reflective treatment is performed on a surface on which the LEDs are arranged to face each other.

The present invention, in the LED unit, each of which implements the LED, provided with a pair of LED substrates facing each other, and a housing which accommodates the reflector and the LED substrate, high heat said housing The LED board is formed of a conductive material and is provided in close contact with the inner surface of the casing.

To achieve the above object, the present invention, the LED unit according to any of the above, and the facing direction of each of the LED units to fit a plurality, the opposing direction of the LED to mouth from eyes of the patient Provided is an illumination device for dental treatment, which is arranged in a substantially orthogonal direction.

  According to the present invention, the reflected lights on the two reflecting surfaces spread in a direction corresponding to the LED at a reference position that is a predetermined distance away from the reflecting surfaces and overlap each other by a width corresponding to the LED separation distance. As a result, in the facing direction of the LED at the reference position, the light whose light distribution is controlled by the reflecting surface is collected within the range of the LED separation distance, and the illuminance is increased. Decreases and is sufficiently weakened. Therefore, by configuring the light source of the dental treatment lighting device so that the facing direction of the LED coincides with the direction from the eyes to the mouth, the patient does not feel dazzling while irradiating the mouth with sufficient light. Can be.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a dental treatment lighting device 1 according to the present embodiment, FIG. 1 (A) shows a bottom surface, and FIG. 1 (B) is a cross section taken along the line II in FIG. 1 (A). FIG.
As shown in FIG. 1, the dental treatment lighting device 1 includes a horizontally long case body 2 having an open bottom surface and a transparent cover 3 made of, for example, resin that covers the bottom surface of the case body 2. The case body 2 includes a middle case 5 with a bottom and an upper case 6 that covers the upper side of the middle case 5, and an LED drive circuit (not shown) is provided in a space 8 between the middle case 5 and the upper case 6. Etc. are built-in.

  A plurality (four in the illustrated example) of LED units 10 are fixed to the bottom portion 5A of the middle case 5 in a row in the longitudinal direction by using the mounting legs 14 in a posture in which the irradiation opening 12 faces downward. Yes. At this time, the inclination angle θ with respect to the horizontal plane H is adjusted for each LED unit 10 so that a shadowless effect is obtained in the illumination area of the dental treatment lighting device 1, and a part of the irradiation range of the adjacent LED unit 10 is partially adjusted. It is set to overlap.

2 is a perspective view showing the configuration of the LED unit 10, FIG. 2A is a perspective view of the LED unit 10 viewed from the irradiation opening 12, and FIG. 2B is a perspective view of the LED unit 10 viewed from the side. . Moreover, FIG. 3 is a figure which shows the front surface of the LED unit 10, a plane, a left-right side surface, and a bottom face. In addition, in FIG. 2, the hidden line which shows the member which cannot be hidden inside is shown with the broken line.
The LED unit 10 includes a substantially rectangular parallelepiped casing 20 having a bottom surface as the irradiation opening 12 and having a longitudinal direction from the front to the back. The casing 20 includes one reflector 22, two LEDs 24, and The LED substrate 26 is accommodated.

The reflector 22 includes two reflecting surfaces 23 </ b> A and 23 </ b> B, and is fixed to the housing 20 with screws 25. Each of the reflection surfaces 23A and 23B has a shape obtained by dividing the rotary paraboloid into two equal parts along the rotation axis (a shape obtained by rotating the paraboloid 180 degrees), and as shown in FIG. They are formed so as to overlap (overlapped) (indicated by a one-dot chain line in FIG. 4). Thus, by making the reflecting surfaces 23A and 23B overlap, the reflector 22 becomes smaller in the width direction and the height direction, and the LED unit 10 is made compact.
When each of the reflecting surfaces 23A and 23B is a rotary paraboloid, the LED 24 described later has a light emitting surface of the LED 24 arranged at or near the focal position of the rotary paraboloid, thereby collecting the emitted light of the LED 24. The light property can be improved.

  One LED 24 is mounted on one LED board 26, and these LED boards 26 are arranged to face each other with the reflector 22 interposed therebetween. Specifically, as shown in FIG. 3, the LED substrate 26 is formed in a rectangular shape having substantially the same size as the front surface and the back surface of the housing 20, and a screw 28 is provided inside each of the front and back surfaces. Thus, the housing 20 is fixed in close contact with the front surface and the back surface of the housing 20. The housing 20 is made of, for example, a highly heat conductive material such as aluminum, and the LED substrate 26 is brought into close contact over substantially the entire front and back regions of the housing 20 so that the efficiency can be improved from the front and back surfaces. The LED 24 is often dissipated.

  The housing 20 includes a front side part 21A and a back side part 21B, and is configured to be split into two along the line II-II in the view showing the bottom surface of FIG. That is, since the housing 20 is configured by sandwiching the reflector 22 and the LED board 26 with the front side part 21A and the back side part 21B, the casing 20 is formed to have a slightly larger size when the reflector 22 and the LED board 26 are manufactured. Even in such a case, these can be housed in the housing 20.

Now, the LEDs 24 mounted on the LED substrate 26 are arranged at the focal positions of the reflecting surfaces 23A and 23B, and the light emitted from each LED 24 is reflected by the reflecting surfaces 23A and 23B, and the reflecting surface 23A. , 23B toward the rotation axis direction.
As described above, the reflecting surfaces 23A and 23B are partially overlapped, and the overlapping portions are notched, so that a concave portion 29 recessed in an arc shape is formed at the boundary between the reflecting surfaces 23A and 23B. Is done. As shown in FIG. 4, the direct light component X that is not reflected by the reflecting surfaces 23 </ b> A and 23 </ b> B, that is, not subjected to light distribution control, increases and enters from the LEDs 10 toward the facing surface side.
At this time, if no measures are taken, the light component X is directly reflected on the front and back surfaces of the housing 20 to cause light leakage components in the front and back directions.

In the dental treatment lighting device 1, as shown in FIG. 1, each LED unit 10 is provided so that the direction connecting the front surface and the back surface of the LED unit 10 (opposite direction of the LED 24) matches the direction from the mouth to the eyes. Therefore, if the light leakage component is large, the patient may feel dazzled.
Therefore, in the present embodiment, as described above, the LED board 26 covers substantially the entire front and back surfaces of the housing 20, and the surface 26A of the LED board 26 (at least a portion to which the direct light component X is irradiated). In addition, by applying an antireflection treatment for preventing reflection of light, the leakage light component is suppressed and the patient is not dazzled.
On the other hand, with respect to the left and right inner side surfaces of the housing 20, the metal surface of the housing 20 is exposed at locations not covered by the reflecting surfaces 23A and 23B, and reflected light is generated. Thereby, the light of LED24 is utilized effectively and irradiated with respect to the width direction of a mouth.

Here, in the present embodiment, as shown in FIG. 4, the distance from the illumination opening 12 of the LED unit 10 is approximately a distance M (for example, 700 mm) from the dental treatment illumination device 1 during dental treatment to the patient's mouth. The reference irradiation area P is set at a position away from the LED, and the LED unit 10 irradiates the reference irradiation area P with light as follows.
That is, the reflected light K1 and K2 of the reflecting surfaces 23A and 23B of the reflector 22 are irradiated to the reference irradiation area P and overlap each other in the reference irradiation area P. At this time, each reflected light The paraboloids of the reflecting surfaces 23A and 23B are formed so that K1 and K2 are widened by a width corresponding to the separation distance L (for example, 38 mm) of the LED 24 in the opposing direction of the LED 24 with the O directly below.

Thereby, in the reference irradiation area P, the light whose light distribution is controlled by the reflecting surfaces 23 </ b> A and 23 </ b> B is collected in the range of the separation distance L of the LED 24 in the facing direction of the LED 24.
At this time, the direct light of the LED 24 is irradiated to the range of the separation distance L together with the light subjected to the light distribution control, whereas only the direct light of the LED 24 is irradiated to the portion away from the separation distance L. . Therefore, in the reference irradiation area P, the illuminance at the part away from the separation distance L is reduced and sufficiently weakened while the illuminance in the range of the separation distance L is sufficiently increased. Therefore, the LED unit 10 is arranged so as to coincide with the facing direction of the LED 24 and the direction from the mouth to the eye, and the light source of the dental treatment lighting device 1 is configured to irradiate the mouth with sufficient light. It is possible to prevent the patient from feeling dazzling.

FIG. 5 is a diagram showing an example of the characteristics of the dental treatment lighting device 1, FIG. 5 (A) shows the illuminance distribution in the reference irradiation region P, and FIG. 5 (B) is a cross section along the facing direction of the LED 24. In addition, FIG. 5C shows the illuminance distribution in a cross section along the left-right direction. The reference irradiation area P is set at a position separated from the dental treatment illumination device 1 by the distance M (700 mm) directly below.
As shown in these drawings, in the reference irradiation area P, the illuminance in the range of the separation distance L (illustrated example L = 38 mm) is sufficiently increased in the direction connecting the front and the back (for example, about 30000 lux). ), It is shown that the illuminance rapidly decreases as the distance from the separation distance L increases, that is, from the mouth toward the eyes.
On the other hand, in the reference irradiation area P, it can be seen that a substantially uniform illuminance distribution is obtained by arranging the LED units 10 in a horizontal row in the horizontal direction.

  Further, as shown in FIG. 5A, the illuminance distribution of the LED unit 10 having the configuration of FIG. 4 is such that the light emitted from the two LEDs 24 overlaps around the center of the irradiating part, and the peripheral part is Illuminance is low because there is little overlap. By installing a plurality of individual LED units 10 having such characteristics by adjusting the mounting angle, the required illuminance at the center of the region is ensured and in regions other than the region between the separation distances L. The amount of light can be suppressed.

Further, as shown in FIG. 5B, each LED unit 10 has the configuration and characteristics shown in FIG. 4, so that even if four LED units 10 are arranged in a row, the amount of light in the region between the separation distances L is secured. However, it is possible to reduce the amount of light in other areas.
Furthermore, since the inclination angle θ with respect to the horizontal plane H is adjusted for each LED unit 10 as described above, a long illuminance distribution in the lateral direction can be obtained as shown in FIG.

As described above, according to the present embodiment, the two reflecting surfaces 23A and 23B of the LED unit 10 have a width corresponding to the separation distance L of the LEDs 24 in the reference irradiation area P in the opposing direction of the LEDs 24. Only spread and overlapped with each other.
As a result, in the reference irradiation area P, the reflected light whose light distribution is controlled by the reflecting surfaces 23A and 23B is collected in the range of the separation distance L of the LED 24 in the facing direction of the LED 24, and the illuminance is increased. The illuminance decreases and is sufficiently weakened at locations far away from. Therefore, according to the dental treatment lighting device 1 in which the LED units 10 are arranged so that the facing direction of the LEDs 24 coincides with the direction from the eyes to the mouth, the light source is configured, and the mouth is irradiated with sufficient light. It is possible to prevent the patient from feeling dazzling.

Moreover, according to this embodiment, since it was set as the structure which performs a non-reflective process to the surface 26A of the LED board 26 located in each opposing surface of LED24, the leak light to the opposing direction of LED24 can be prevented.
Moreover, according to this embodiment, since the housing | casing 20 was formed from the high heat conductive material and the LED board 26 was closely provided in the inner surface of the housing | casing 20, the heat_generation | fever of LED24 can fully be thermally radiated.

  The above-described embodiment is merely an aspect of the present invention, and it is needless to say that modifications and applications can be arbitrarily made within the scope of the present invention.

It is a figure which shows the structure of the illuminating device for dental treatment which concerns on embodiment of this invention, (A) shows a bottom face, (B) is a figure which shows the cross section in the II line | wire of (A). It is the perspective view which shows the structure of an LED unit, (A) is the perspective view which looked at the irradiation opening of the LED unit, (B) is the perspective view which looked at the side surface of the LED unit. It is a figure which shows the front of a LED unit, a plane, a left-right side surface, and a bottom face. It is a figure for demonstrating the characteristic of an LED unit. It is a figure which shows an example of the characteristic of the illuminating device for dental treatment, (A) shows the illumination intensity distribution in a reference | standard irradiation area, (B) shows the illumination intensity distribution in the cross section along the opposing direction of LED, C) shows the illuminance distribution in a cross section along the left-right direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dental treatment lighting device 2 Case body 10 LED unit 12 Irradiation opening 20 Housing | casing 21A Front side part 21B Rear side part 22 Reflector 23A, 23B Reflective surface 24 LED
26 LED board L LED separation distance P Reference irradiation area (reference position)

Claims (4)

A reflector and a pair of LEDs opposed to each other with a predetermined separation distance across the reflector,
The reflector is formed with two reflecting surfaces corresponding to the LEDs,
Each of the reflecting surfaces, the predetermined distance in the opposite direction of the LED in the center the right under a predetermined distance apart reference irradiation region is set to the reference positions directly below each reflected light from the reflector An LED unit characterized in that it is formed so as to extend by a corresponding width and overlap each other. 2. The LED unit according to claim 1, wherein a surface on which the LEDs are arranged to face each other is subjected to an antireflection treatment. Each of which implements said LED, and a pair of LED substrates facing each other,
A housing containing the reflector and the LED substrate;
3. The LED unit according to claim 1, wherein the housing is formed of a high thermal conductive material, and the LED substrate is provided in close contact with an inner surface of the housing. A plurality of the LED units according to any one of claims 1 to 3 ,
An illumination device for dental treatment , wherein each of the LED units in which LED facing directions are aligned from a patient's eye to a mouth is arranged in a direction substantially orthogonal to the facing direction.

Images