JP2005103133A - Light irradiator apparatus for medical purpose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light irradiator for attaining high efficiency in conversion from power into a light output, which is the feature of an LED, by solving problems due to the heat generation of the LED and allowing the irradiator for freely irradiating a desired part with light with prescribed wave length to use the LED as a light source. <P>SOLUTION: The light irradiator 10A is used for medical purpose in dentistry and surgery, etc. A light emission diode single body 3 as the light source and a lens 4, which outputs light inputted from the light emission diode single body so as to focus light on the desired position, are separated by prescribed length and arranged inside a case 5. The case is formed so that at least a part facing the light output position of the lens is transparent. The case is filled with a liquid coolant 6 in liquid tight. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a medical light irradiation apparatus for irradiating a predetermined portion with light in a medical site such as dentistry or surgery.

  A photocurable resin is known as a material for making up and restoring teeth by making up for a crown loss caused by touching or brushing in a medical field such as dentistry. Conventionally, a light irradiation apparatus using a halogen lamp as a light source has been used as a means for curing these photocurable resins.

  In addition, a light irradiation device using a blue light emitting diode is provided as a model number ORL-1 and a medical device permission number 23BZ0075 from Nagata Electric Industry Co., Ltd. That is, the photocurable resin contains camphorquinone as a photosensitizer for curing the resin, and the light wavelength that this photosensitizer easily absorbs is 400 to 500 nm. Is a light irradiation device using the blue light emitting diode.

  In the above light irradiation devices, in order to cool the halogen lamp and the blue light emitting diode which are light sources, a cooling fan is mounted. When curing a photocurable resin in a short time for clinical needs, at least about 5000 lux of light is required at the irradiated site, and not only a halogen lamp that emits high heat as a high-intensity light source, Even if a light emitting diode that generates less heat (hereinafter sometimes referred to as an LED in this specification) is used, it is necessary to collect and use dozens of elements in order to increase the amount of light at the irradiation site. As a result, the amount of heat generation increases, and in any case, some kind of cooling device is required to prevent burning of the halogen lamp, the LED element, and the optical elements such as the attached lens and overheating of the instrument itself.

  Such heat accumulation is not preferable because the lifetime of the halogen lamp or the LED element is significantly reduced. In particular, when a cooling fan or the like provided in these light irradiation devices is stopped unexpectedly, a considerable amount of heat already generated is accumulated in the devices even if the light irradiation device is immediately stopped. That is, there is a high possibility that the light irradiation device is damaged by overheating.

  In addition, as a general property of LED, an increase in the temperature of the element causes an increase in the amount of current, so in a device using LED as a light source, heat generation due to current loss becomes a relatively large value, and in an LED having poor thermal durability, The increase in ambient temperature due to the integrated use is a major factor for shortening the lifetime of the device and its surrounding materials. That is, in the LED, as the current is supplied, the amount of light emission increases proportionally, while the amount of heat generation increases significantly, and the deterioration of the sealing resin of the LED chip becomes serious.

  In particular, in high-intensity LEDs developed in recent years, the heat resistance of the transparent plastic material that seals the LED element against heat generation due to current loss is insufficient, so the conventional high-intensity LED element is fixed as a single product. Can not be formed. In order to avoid this problem, a recently developed high-intensity LED, for example, a high-intensity LED of model number NSHx180F manufactured by Nichia Corporation, employs a hermetically sealed structure that does not use organic substances such as resin. The structure in which the sealing material is in contact with the LED element as in the prior art is not employed, and is taken as a countermeasure against deterioration of the sealing material caused by heat generation of the LED element.

  However, the above hermetically sealed structure is merely an improvement in the heat resistance of the LED, and an effect of reducing the temperature rise of the LED element can hardly be expected. Therefore, if the heat generated by the LED element increases not only the element but also the temperature of the light irradiation device itself, this heat will cause discomfort to the patient and medical staff.

  Furthermore, in order to improve operability, these light irradiation devices are generally driven by a secondary battery (rechargeable battery), and overheating due to light emission of the LED element brings about an increase in power consumption, Since it is necessary to direct battery power to the cooling device of the LED element, the operation time of the light irradiation device is shortened as a result.

  Further, the problem of heat generation particularly in the high-intensity LED greatly affects the light output and means for conducting to the target site. The reason is that it is difficult to connect or bring a resin product such as an optical fiber or a lens to an LED element that overheats, as in the sealing resin described above. Even if these lenses and other optical elements are made of any material, their heat resistance is limited, and there is a limit to avoid the effects of LED heat when using this for the purpose of guiding light output. It is necessary to install it at a certain distance. However, the gap formed between the light emitter and the optical element is not preferable because it causes a large attenuation of the light output. Also in this respect, the heat generation of the LED element hinders the effective use of the light output.

  Furthermore, recent LEDs have been downsized, and products having a chip shape of about 1 cubic millimeter have become widespread. When the LED is used as a light source due to the downsizing of the LED, it is possible to manufacture an LED lamp with a small size and a large light amount by integration.

  In particular, the benefits of integrating these LED elements are great in the dental field. For example, in a light irradiation device for curing a photocurable resin, the light is condensed by complicated optical means in order to secure a light amount capable of curing the photocurable resin in a short time that is essential in dentistry at the irradiated site. There was a need. For example, light from a large number of lamps arranged on a grid is introduced into an optical fiber using a lens or the like, and the light is transmitted to an irradiation site through the optical fiber, or an optical fiber is connected to a light emitting portion of each LED element. It was a very complicated device that made it correspond to one by one and bundled many optical fibers to converge on the irradiated part.

  On the other hand, the area of the light emitting part by the integration of the chip-type LEDs is less than 1 square centimeter even when the LED elements that satisfy the light quantity necessary for curing the photocurable resin are used as an array. Therefore, unlike the conventional case, the light output transmission means can provide the necessary amount of light to the irradiation site with glass, resin rods or a simple optical fiber bundle without using complicated optical condensing means. Become.

However, when LED chips are integrated in order to realize this, the heat generated from the LED elements becomes a major obstacle. For example, in an array in which 50 blue LED chips of model number E1S03-AB1A7-02 manufactured by Toyoda Gosei Co., Ltd. are integrated in a circle, the diameter of the light emitting surface is about 1 centimeter. Then, after 30 seconds, the LEDs in the center start to burn out and disappear, and after 10 minutes, about half of the LEDs center around the center burn out. That is, when trying to obtain high light emission from the LED, heat generation from the LED element becomes an obstacle, whether it is used alone or a plurality of LEDs are integrated.
Therefore, avoiding excessive heat generation of the high-brightness LED is extremely important in extending the useful life of the LED element and improving energy efficiency by reducing power consumption.

Based on the above-mentioned problems of the LED, the applicant of the present invention is an illumination such as a surgical lamp capable of avoiding excessive heat generation without disturbing the function of the LED element in order to effectively use the LED element. The device was invented, and this lighting device has already been registered as Japanese Patent No. 3149402 (Patent Document 1).
The illumination device in Patent Document 1 includes an LED array as a light source, a heat sink to which the LED array is attached, a cup-shaped transparent case protruding from the heat sink so that the LED array is contained, It is composed of a lens attached to the tip of the transparent case, and a liquid coolant filled inside the cup-shaped transparent case and the heat sink. With such a configuration, the temperature of the LED element can be kept lower than about 80 ° C., an increase in the amount of current due to overheating can be avoided, and the lifetime of the LED element can also be improved. Moreover, the temperature rise of liquid coolant itself can also be suppressed to about 50 degreeC.

Japanese Patent No. 3149402

  However, the device described in Patent Document 1 relates to a medical lighting device such as a surgical light, and this device can cure a photocurable resin for shaping and restoring teeth in the oral cavity. is not.

  Therefore, in the present invention, it is possible to use the LED as a light source in an apparatus that can freely irradiate light of a predetermined wavelength to a desired site by solving the problems associated with the heat generation of the LED as described above. Then, it aims at providing the light irradiation apparatus which can enjoy the high conversion efficiency from the electric power which is the characteristics of LED to the light output.

  Further, in the conventional light irradiation apparatus, light is irradiated to a predetermined part by optically complicated condensing means. On the other hand, in the present invention, the structure of the apparatus itself is simplified and miniaturized. An object is to provide an irradiation apparatus.

In this invention, it is a light irradiation apparatus used for medical treatment, such as dentistry and surgery, Comprising: This apparatus concentrates the light input from LED single-piece | unit or LED array as a light source, and this LED single-piece | unit or LED array in a predetermined position. The optical member capable of outputting is disposed within the container at a predetermined distance from the optical member, and at least a portion facing the light output position of the optical member is transparently formed in the container. There is provided a medical light irradiation apparatus in which a liquid coolant is liquid-tightly filled.
In the light irradiation device of the present invention, the light output from the single LED or the LED array is input to the optical member through the liquid coolant, passes through the optical member, and then passes through the container again through the liquid coolant. Then, it is radiated to the outside and reaches the irradiation target site. The light input to the optical member is adjusted so that the optical axis is adjusted here and becomes light having directivity in the forward direction. For example, the light is collected so as to irradiate a predetermined site in the oral cavity.
In the light irradiation device, the liquid coolant is filled in the gap between the LED alone or the LED array and the optical member, the gap between the LED alone or the LED array and the container inner surface, and the gap between the optical member and the container inner surface. Therefore, the adverse effect due to the heat generated by the LED does not reach any of the LED, the optical member, and the container, and various problems associated with the heat generation of the LED are solved.

Moreover, in this invention, it is a light irradiation apparatus used for medical treatment, such as dentistry and surgery, Comprising: This apparatus WHEREIN: LED single-piece or LED array as a light source is arrange | positioned inside a container, and this LED single-piece or LED array outputs. A light guide member capable of guiding light to a predetermined position outside the container is arranged so that one end of the light guiding member extends into the container and is opposed to the LED alone or the LED array by a predetermined length, and the interior of the container Is provided with a medical light irradiation device that is liquid-tightly filled with a liquid coolant.
In the light irradiation device, the light output from the single LED or the LED array is input to the light guide member through the liquid coolant, and is output to the outside of the container through the light guide member. Led up to. Therefore, once the light is input to the light guide member, the optical axis is not disturbed until reaching the irradiation target part, and the attenuation is suppressed to be extremely low, for example, intensively irradiating a predetermined part in the oral cavity.
In the light irradiation device, since the liquid coolant is filled in the gap between the LED alone or the LED array and the light guide member, or the gap between the LED alone or the LED array and the container inner surface, the heat generated by the LED is generated. The adverse effect due to the above does not affect any of the LED, the light guide member, and the container, and the problems associated with the heat generation of the LED are solved.

  In the present invention, the liquid coolant has a large heat capacity and good thermal conductivity so that the LED can be prevented from overheating, is chemically stable even when heat is applied, and hardly changes. In addition, a material that has a certain degree of electrical insulation and can be transmitted so that attenuation of light output from the LED is extremely low is used. Although such a liquid coolant is not specifically limited, For example, it is preferable to use silicon oil.

  In the present invention, a single LED can be used, or LEDs in which LEDs are integrated two-dimensionally or three-dimensionally can be used.

  Moreover, in this invention, the recessed part larger than the said LED single-piece | unit or the said LED array can be provided in the end surface of the light guide member extended in the said container. The LED alone or the LED array is disposed inside the recess, and a clearance of a predetermined length is formed between the LED and the recess of the light guide member. By arranging the LED and the concave portion of the light guide member in this way, the adverse effect due to the heat generated by the LED does not reach the light guide member, and light is output from the single LED or the LED array, In the process from passing through the liquid coolant to entering the light guide member, the attenuation can be suppressed to an extremely low level.

  Furthermore, in the present invention, the light guide member may be any member as long as it can transmit light to a predetermined position while suppressing the attenuation amount to be extremely low, for example, a bundle of optical fibers, or a rod-like glass formed simply from glass. Alternatively, it is possible to apply a bundle of optical fibers or a plurality of rod-shaped glasses. An optical member such as a lens may be attached to the leading ends of these light guide members, that is, the ends of the light guide members that are extended to the outside of the container to output light. .

  In the light irradiation device of the present invention, among various LEDs, in particular, a white LED can be used as a light source. If the light irradiation device is configured in this way, it can be used as a touch diagnostic device by observing transmitted light by irradiating the crown in dentistry.

  Moreover, in the light irradiation apparatus of this invention, red LED or infrared light LED can be used as a light source. If the light irradiation device is configured in this way, it can be used as a device for measuring tissue blood oxygen saturation, such as a pulse oximeter, by detecting the reflected light or transmitted light of the tissue in the oral cavity.

  Furthermore, in the light irradiation device of the present invention, a chip-type blue LED can be used as a light source. By configuring the light irradiation device in this way, it becomes possible to output light having a wavelength of 400 to 500 nm, which is an absorption wavelength band of camphorquinone as a photosensitizer contained in the photocurable resin. The light irradiation device in can be realized in a smaller size, quieter and lower cost than the conventional device.

  In the light irradiation device of the present invention, since the problems associated with the heat generation of the LED have been solved, it is possible to use the LED in an integrated manner, compared to a conventional medical light irradiation device such as dentistry or surgery. This makes it possible to reduce the size of the device. In addition, in order to obtain the required amount of light at the irradiation site, the complicated optical condensing function that was necessary in the conventional apparatus can be omitted, so the cost can be reduced by simplifying the apparatus and the apparatus can be downsized. Is easy to realize. Further, in the light irradiation device of the present invention, the LED is cooled by the liquid coolant, so that the heat generation of the device is suppressed, so cooling with an air cooling fan or the like used in most conventional devices is unnecessary, In addition to simplification of the apparatus, it is possible to eliminate the noise and power consumption caused by the fan. In clinical practice, medical workers and patients who handle the light irradiation device do not receive heat discomfort. Furthermore, since the temperature rise of the LED element is suppressed to be extremely small, the deterioration of the LED element due to heat can be suppressed to a minimum, and the service life of the apparatus can be made relatively long. As described above, the present invention that suppresses overheating of the LED element makes it possible to provide the LED with a higher light output, increase the usefulness as an irradiation device, and in the dental clinic, the polymerization depth of the photocurable filler. Therefore, it is possible to apply a photocurable filler to a deeper and larger cavity.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.
The light irradiation device of the present invention irradiates light to a predetermined site intensively in a medical site such as dentistry or surgery. For example, the light irradiating device can be used as spot lighting for intensively brightening an affected area, or It is used for curing a photo-curable resin provided at a predetermined site of the device, and further, it is used as a touch diagnostic device by observing transmitted light by irradiating a dental crown in the oral cavity.

  FIG. 1 is a diagram schematically showing a light irradiation apparatus 10A according to a first embodiment of the present invention. In the light irradiation device 10A, the LED single body 3 in which the LED element 1 is sealed with the sealing material 2, and the lens 4 that can output the light input from the LED single body 3 and collect it at a predetermined position are formed of transparent glass. The case 5 is filled with a coolant 6 made of silicon oil in a liquid-tight state, and the wiring 7 extends from the LED 3 to the outside of the case 5 to supply power. 8 is connected. Here, the LED unit 3 and the lens 4 are arranged with a gap of a predetermined length, the LED unit 3 and the inner surface of the case 5 are arranged with a gap of a predetermined length, and further, the lens 4 and the inner surface of the case 5 are arranged. Are arranged with a gap of a predetermined length, and therefore, the gap is filled with the coolant 6.

Next, the operation of the light irradiation apparatus 10A in FIG. 1 will be described.
When current from the power source 8 is supplied to the LED element 1 through the wiring 7, light is output through the sealing material 2, passes through the coolant 6, and is input to the lens 4. Light is input to the lens 4 while being birefringent at the interface between the sealing material 2 and the coolant 6 and at the interface between the coolant 6 and the lens 4. The light is changed to a certain light, passes through the sealing material 2 again, and is emitted from the case 5 to the outside, so that a predetermined part can be intensively irradiated. In general, the light from the LED element 1 is diffused in a direction of 360 ° from the light emitting point. In this light irradiation device 10A, the single LED 3 is enclosed in the case 5 together with the coolant 6. Therefore, it is possible to obtain the same effect as that of a clear lens employed in a conventionally used lamp-type LED, and it is possible to impart forward directivity to the output light.

  Further, in the light irradiation device 10A, since the heat from the LED unit 3 can be quickly diffused by the coolant 6, the lens 4 is relatively close to the LED unit 3 without concern about deterioration due to heat. It becomes possible to fix. However, when the single LED 3 is a high-intensity LED, heat generation may be extremely high. In this case, the single LED 3 and the lens 4 are arranged so that the clearance is relatively large. By making the coolant 6 easily flow through the clearance, the high-brightness LED is quickly cooled, and heat can be prevented from propagating to the lens 4. Even if the clearance is relatively large as described above, the light from the high-intensity LED does not propagate in the air, so that attenuation of the light amount in the propagation process up to the lens 4 can be suppressed to the minimum.

In addition, in the light irradiation device 10A, the LED element 1 is sealed with the sealing material 2 and the LED unit 3 is used as a light source, but here, since silicon oil is used as the coolant 6, For example, an LED element that is not sealed with a sealing material can be used as a light source. In this case, the LED element is directly cooled by silicon oil.
The lens 4 preferably has a shape and a size corresponding to the light emitting surface of the single LED 3. That is, in many cases, the single LED 3 is used in which the light emitting surface is formed in a concave surface or a flat surface. Therefore, the lens 4 is convex on both sides, the light incident surface is flat, and the output surface is convex. An achromatic lens or an aspherical lens can be used.

FIG. 2 is a diagram schematically showing a light irradiation apparatus 10B according to the second embodiment of the present invention.
This light irradiation device 10B is different from the first embodiment in that a light guide member 9 is used instead of the lens 4 in FIG. 1, and other configurations are substantially the same as those in the first embodiment. Accordingly, the same components are denoted by the same reference numerals and description thereof is omitted, and different configurations will be mainly described below.
In the second embodiment, the light guide member 9 is formed of a material such as a synthetic resin capable of conducting light, an optical fiber, glass or the like in a linear or rod shape. Such a light guide member 9 has one end extending through the case 5 and extending to the inside, and the end face 9a is opposed to the light emitting surface of the single LED 3 by a predetermined distance. The other end of the member 9 is formed to extend a predetermined length outside the case 5. Inside the case 5, a coolant 6 is filled in the gap between the end surface 9 a of the light guide member 9 and the light emitting surface of the LED unit 3.
In the second embodiment, a concave portion 9 c as shown in FIG. 3 may be formed on the end surface 9 a of the light guide member 9. In this case, as the light source, it is possible to use the LED element 1 that is not sealed with the sealing material, or it is possible to use the LED element 3 in FIG. 1, and the LED element 1 or the LED element 3 is formed in the recess 9c. The LED element 1 or the LED single body 3 and the recess 9c are arranged so as to have a predetermined length of clearance, and the clearance 6 is filled with the coolant 6 as well. By arranging the LED element 1 or the LED single body 3 in the concave portion 9c in this way, the adverse effect due to heat from these LEDs does not reach the light guide member, and the light guide member passes through the coolant 6 from the LED. In the process up to the input to 9, it is possible to suppress the attenuation amount to be extremely low.

Next, the operation of the light irradiation apparatus 10B in FIG. 2 will be described.
When current from the power supply 8 is supplied to the LED element 1 through the wiring 7, light is output through the sealing material 2, passes through the coolant 6, and is input to the light guide member 9 from the end surface 9 a. The light passes through the inside of the light guide member 9 and propagates to the output end 9b, and is irradiated from the output end 9b toward the irradiation target site. Here, the light is input to the light guide member 9 while being birefringent at the interface between the sealing material 2 and the coolant 6 and at the interface between the coolant 6 and the end surface 9a. Light propagates with forward directivity, and this propagation process is hardly affected by attenuation regardless of the length of the light guide member 9. Therefore, if the light guide member 9 is formed relatively long and its output end 9b is close to the irradiation target site, light can be efficiently irradiated.
Since light tends to diffuse at the output end 9b of the light guide member 9, it is preferable to attach an optical member (not shown) such as a lens to the output end 9b. Enables excellent light irradiation.
As described above, in the second embodiment, the same operations and effects can be obtained from the same configuration as in the first embodiment, but the description thereof will be omitted.

FIG. 4 is a view schematically showing a light irradiation apparatus 10C according to the third embodiment of the present invention.
This light irradiation apparatus 10C is different from the first embodiment in that an LED integrated body 11 formed by integrating a plurality of single LEDs 3 in the first embodiment is used, but the other configurations are the first embodiment. It is almost the same as the example. Accordingly, the same components are denoted by the same reference numerals and description thereof is omitted, and different configurations will be mainly described below.
In the third embodiment, the lens 4 having a size that can correspond to the entire light emitting surface of the LED integrated body 11 is used. However, in some cases, it is difficult to change the light from the plurality of LEDs 3 into a uniform irradiation light having forward directivity by using only one lens 4. In such a case, a plurality of lenses (not shown) are provided on the optical path. It is also possible to provide a so-called multi-lens structure. For example, in order to enlarge and project an X-ray photograph or the like on a screen, a parallel beam is required as a light source. In such a case, a parallel beam can be realized by adopting a multi-lens structure.

  Regarding the third embodiment, for example, when white LED chips of model number E1S31-AWOC7-01 manufactured by Toyoda Gosei Co., Ltd. are used, a maximum of 75 chips can be integrated per square centimeter, and the diameter is 1 cm. About 60 chips can be placed in a meter circle. In the light irradiation apparatus 10C according to the present invention, the above-mentioned 72 white LED chips arranged in a circle having a diameter of 1.5 centimeters could be irradiated with light having a brightness of 5360 lux at a distance of about 50 centimeters.

FIG. 5 schematically shows a light irradiation apparatus 10D according to the fourth embodiment of the present invention.
In this light irradiation apparatus 10D, instead of the lens 4 in the third embodiment, a plurality of light guide members 9 used in the second embodiment are arranged, and the same configuration in the second embodiment and the third embodiment. Are denoted by the same reference numerals, and different configurations will be mainly described below.
Here, the light guide member 9 is made of a material such as a synthetic resin capable of conducting light, an optical fiber, or glass and formed in a linear or rod shape. As shown in FIG. 5, a plurality of light guide members 9 are arranged or a bundle of light guide members 9 is arranged.
In the light irradiation device 10D, the light output from the LED integrated body 11 is input to the plurality of light guide members 9, propagates through the light guide members 9, and is irradiated from each output end 9b. Is irradiated. Also in this embodiment, it is preferable to attach an optical member such as a lens to the output end 9b. As described above, the plurality of light guide members 9 are formed so that the sum of the cross-sectional areas thereof is substantially equal to the light emitting surface of the LED integrated body 11, and therefore, from the light irradiation device 10B of the second embodiment. In addition, it is possible to irradiate the irradiation target site with a much larger amount of light.
In addition, when using an optical fiber as the light guide member 9, since the cooling liquid 6 can transmit light efficiently to the light guide member 9, each LED unit 3 and each optical fiber are arranged to face each other. Further, it is not necessary that the number of the single LED 3 and the number of the optical fibers coincide with each other. Nevertheless, the irradiation target portion can be irradiated with a sufficient amount of light from the output end 9b of the light guide member 9. it can.

Next, features common to the first to fourth embodiments will be described.
In the light irradiation devices 10A to 10D of the present invention, the cooling liquid 6 can efficiently diffuse heat by thermal convection, and a stirring blade such as a pump or a propeller that stirs the cooling liquid 6 is used as a case. If it is provided inside 5, the heat generated from the LED element 1 can be removed more rapidly. Moreover, if a heat sink is connected using a heat pipe etc., it is also possible to air-cool the cooling liquid 6 rapidly. Furthermore, if a cooling device is separately installed outside, connected to the case 5 by a pipe or a pump, and the coolant 6 is circulated through the external cooler, the temperature of the coolant 6 can be lowered more efficiently.
When the LED is operated at a low temperature, the dark current is reduced, the conversion efficiency from power to light is improved, and the lifetime of the LED can be expected to be extended. Therefore, it is possible to provide a powerful cooling device and thereby reduce the temperature of the coolant 6, but it is also conceivable that condensation occurs on the outer surfaces of the light irradiation devices 10 </ b> A to 10 </ b> D due to a difference from the ambient temperature. . In such a case, it is possible to prevent dew condensation by creating an air flow in the surrounding atmosphere using a blower or the like, or by providing a double case around the outer periphery of the case 5 via air.
As the light source, it is possible to use a conventional LED array or a built-in LED array, but silicon oil or the like that has high insulation properties and does not deteriorate the function or material of the LED element. When used as a coolant, it is possible to omit the sealing material that originally sealed the LED element in order to avoid deterioration due to oxidation or the like, and use the LED with the LED element exposed as a light source It becomes possible to do.

It is the figure which showed roughly the light irradiation apparatus which is the 1st Example of this invention. It is the figure which showed roughly the light irradiation apparatus which is the 2nd Example of this invention. In 2nd Example, it is the figure which showed what the end surface of the light guide member was formed in the shape different from FIG. It is the figure which showed roughly the light irradiation apparatus which is the 3rd Example of this invention. It is the figure which showed roughly the light irradiation apparatus which is 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED element 2 Sealing material 3 LED single-piece | unit 4 Lens (optical member)
5 Case (container)
6 Coolant 8 Power supply 9 Light guide member 9c Recess 10A-10D Light irradiation device 11 LED integrated body

Claims (3)

  A light irradiation apparatus used in medical treatment such as dentistry and surgery, wherein the apparatus condenses a light emitting diode alone or a light emitting diode array as a light source and light input from the light emitting diode alone or the light emitting diode array at a predetermined position. The optical member capable of outputting is disposed within the container at a predetermined distance from the optical member, and at least a portion facing the light output position of the optical member is transparently formed in the container. A medical light irradiation apparatus in which a liquid coolant is liquid-tightly filled.   A light irradiation device used for medical treatment such as dentistry and surgery, wherein the light emitting diode unit or the light emitting diode array as a light source is arranged inside a container, and the light output from the light emitting diode unit or the light emitting diode array A light guide member capable of guiding the light to a predetermined position outside the container is disposed so that one end of the light guiding member extends into the container and is opposed to the light emitting diode alone or the light emitting diode array by a predetermined length. A medical light irradiation device in which a liquid coolant is liquid-tightly filled.   A concave portion larger than the light emitting diode alone or the light emitting diode array is provided at one end of the light guide member extended into the container, and the single light emitting diode or the light emitting diode array is separated by a predetermined length inside the concave portion. The medical light irradiation apparatus according to claim 2, wherein the medical light irradiation apparatus is disposed so as to face each other.

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