JP2007044091A - Compact apparatus for radiating near infrared ray - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for radiating linearly polarized near infrared ray which is carried to various places at home or in the office, is used easily by anyone when necessary, and is used for various objects to be radiated. <P>SOLUTION: The compact apparatus for radiating near infrared ray comprises a carriable tubular case 3 having a cross section and a length which can be gripped and operated by the fingers of the hand, a light source 4 for radiating near infrared ray and visible light having continuous spectra, a wavelength converting material 6 arranged around the light source for converting the visible light into near infrared ray, a polarizer 8 for linearly polarizing the near infrared light radiated from the light source, a visible light absorbing material 10 arranged between the polarizer 8 and the light source 4 for absorbing and damping the visible light, and an irradiation port 12 for making the near infrared ray pass through the polarizer 8 to be emitted outside. The linearly polarized near infrared ray emitted from the irradiation port 12 is radiated to an object to be radiated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a near-infrared irradiation device that irradiates animals and plants and inorganic substances, and more particularly to a linearly polarized near-infrared irradiation device that linearly polarizes near-polarized near infrared rays and irradiates an irradiated object.

  Massage, acupressure, acupuncture, etc. have been actively performed for a long time to maintain health, but in recent years, many people suffer from poor physical condition due to stress as the social environment changes rapidly. In addition, as with humans, animals suffer from various diseases caused by stress, which are bothering their owners. Therefore, it is expected to develop a new health appliance that can be easily used at home or at work, can be safely handled by anyone, and can be used for animals.

  In fact, in specialized institutions such as hospitals, block therapy, drug therapy, and various physical therapies for sensory nerves and exchange nerves are given for chronic pain, but these treatment methods are sophisticated in handling. Technology is required, and the burden on patients such as pain associated with needle sticks is large. Therefore, treatments that do not cause pain to patients are being reviewed.

  Examples of health appliances that have been used in ordinary homes include massage devices that apply low frequencies, heating devices such as hot bags, and phototherapy devices that use infrared lamps. In recent years, laser therapy devices using laser light, near-infrared irradiation devices that irradiate near-infrared rays, and the like have attracted particular attention in specialized institutions such as hospitals.

  Laser therapy devices can irradiate single-wavelength light with low output, so they can be used for pin-spot irradiation or inflammation sites in a pin-spot, and are highly effective for analgesia, anti-inflammation, and wound healing. The light containing infrared rays generated from the infrared lamp is reflected by a reflecting mirror and irradiated, and infrared rays having a sufficient energy density cannot be irradiated. On the other hand, the near-infrared irradiation device that has attracted particular attention in recent years is a device that can irradiate the near-infrared rays having the highest living body depth among the light rays in a spot shape. The irradiated light energy is converted into heat energy in the affected area, and there is no pain and other pains, and there is a pleasant irritation and warm feeling such as acupuncture and warmth.

International publication WO96 / 21490 (patent document 1) is disclosed as a prior art relating to a linearly polarized near-infrared irradiation device having such effectiveness. This technique relates to a near-infrared treatment device for use in physical practice, and relates to a device that can irradiate a small infrared region with a near-infrared ray having a sufficient energy density.
International Publication No. WO96 / 21490

  In the linearly polarized near-infrared irradiation device described in Patent Document 1, the irradiation device main body and the irradiation member are arranged separately, and a large-capacity halogen lamp is used as the light source in the irradiation device main body. For this reason, a large amount of heat generation is required to install a large cooling fan for heat dissipation, and a complicated electric control circuit for radiating near infrared rays to the irradiation member through an optical cable is required. As a result, the size of the main body of the irradiation device is about 50 cm wide, about 20 cm deep, and about 100 cm high. It is heavy and must be moved by a moving caster, which is very expensive. is there. In addition, since the near-infrared luminous flux can be narrowed down by a condensing lens to irradiate powerful near-infrared rays, handling requires utmost care and can only be used by professionals. Furthermore, the power supply used requires a dedicated circuit and cannot be used anywhere. Therefore, it cannot be easily used anywhere in the home or workplace, and is only used by dedicated staff at specialized institutions such as hospitals.

  The inventor of the present invention has devised the present invention so that the linearly polarized near-infrared ray having the above-described excellent effects can be used everywhere when necessary. Therefore, the object of the present invention is small and lightweight that can be carried anywhere in the home or workplace, good operability that can be easily used by anyone when needed, and safety that can be used for any irradiated object. It is to provide a linearly polarized near-infrared irradiation device that is inexpensive in price.

  The present invention has been proposed in order to solve the above problems, and a first embodiment of the present invention includes a portable cylindrical case having a cross-sectional area and a length that can be grasped and operated by fingers, A light emitting source that emits near infrared rays arranged at a required position in a cylindrical case, a polarizer that is arranged in a cylindrical case and linearly polarizes near infrared rays emitted from the light emitting source, and linearly polarized light that has passed through the polarizer A compact unit that irradiates the irradiated object with linearly polarized near-infrared rays radiated from the irradiation port, comprising at least an irradiation port at the tip of the cylindrical case that radiates near infrared rays to the outside and a light emission controller that controls the light emission of the light source. It is a near infrared irradiation device.

  The 2nd form of this invention is a small near-infrared irradiation apparatus in which a light emission source light-emits visible light as a continuous spectrum with a near infrared ray in the 1st form.

  According to a third aspect of the present invention, in the second aspect, a small near-infrared radiation that amplifies the intensity of near-infrared light incident on the polarizer by disposing a wavelength conversion material that converts visible light into near-infrared light around the light emitting source. Device.

  According to a fourth aspect of the present invention, in the second or third aspect, a visible light absorbing material that absorbs and attenuates visible light is disposed before or after the polarizer, and the purity of linearly polarized near-infrared radiation emitted from the irradiation port is increased. It is a small near-infrared irradiation device to enhance

  According to a fifth aspect of the present invention, there is provided a compact near-infrared irradiation device according to the first aspect, wherein the light-emitting source is a semiconductor light-emitting source that emits one or more monochromatic near-infrared rays in the near-infrared wavelength region.

  According to a sixth aspect of the present invention, in the fifth aspect, the light emitting source is an LED combination, and a small near infrared ray in which the emission surfaces of a plurality of LEDs having different emission wavelengths are aligned in the radiation direction of the cylindrical case. Irradiation device.

  The 7th form of this invention is a small near infrared irradiation apparatus with which the light emission controller is loaded in a cylindrical case in the 1st-6th form.

  The 8th form of this invention is a small near-infrared irradiation apparatus by which a light emission controller is arrange | positioned separately from a cylindrical case in the 1st-6th form, and a cylindrical case and a light emission controller are connected with a connection cable. .

  According to the first aspect of the present invention, the near infrared irradiation device is housed in a cylindrical case having a cross-sectional area and a length that can be grasped and operated by a finger, so that it is small and can be carried and carried anywhere. . In addition, since it can be grasped and operated by fingers, it can be easily used by elderly people and children. Furthermore, since the light emitting source that radiates near infrared rays is disposed not inside the cylindrical case but inside the cylindrical case, the near infrared rays can be irradiated with a small light emitting source, and a complicated and large electric circuit is not required. As a result, power consumption can be reduced, and the near-infrared irradiation device can be reduced in size, weight, and cost. In addition, a polarizer can be placed in front of the light emitting source to irradiate linearly polarized near-infrared rays that could not be irradiated without a large apparatus. The polarizer according to the present invention is a polarizer that converts all light such as circularly polarized light and random polarized light into linearly polarized light, and this polarizer includes a normal polarizing plate, a beam splitter, a linearly polarizing element, and the like. This linearly polarized near-infrared ray is extremely deep in the living body and has various effects. Conventionally, this linearly polarized near-infrared ray can only be used in specialized institutions such as hospitals. With the small near infrared irradiation device of the present invention, each individual at home or at work can achieve various effects using linearly polarized near infrared rays. Furthermore, if the power source used is a storage battery type or a dry battery type, it can be carried anywhere and can be used whenever necessary.

  According to the 2nd form of this invention, since the light emission source radiates | emits a visible ray as a continuous spectrum with near infrared rays, there exists an effect which relieve | moderates the specific irradiation efficacy which near infrared rays have. Therefore, if it irradiates the skin and outer skin of a person, animals and plants, it can give a gentle stimulus to the irradiated part and can be used safely. There are halogen lamps, xenon lamps, tungsten lamps, etc. as light emitting sources that emit visible light as a continuous spectrum together with near infrared rays, and there are various sizes of spheres depending on the usage capacity, which can be selected and used according to the purpose of use. . Accordingly, a cylindrical case having an optimum size according to the purpose of use can be produced, and the near infrared irradiation device can be reduced in size and weight.

  According to the third aspect of the present invention, the wavelength conversion material that converts visible light into near infrared light can be disposed around the light emitting source to amplify the intensity of the near infrared light, so that the power consumption of the light emitting source can be reduced. If the wavelength conversion material is arranged around the entire periphery of the light emitting source, the intensity of near infrared light can be further amplified, and the power consumption can be further reduced. Further, by forming the inside of the cylindrical case through which the near infrared rays are transmitted with a mirror finish, the near infrared intensity can be prevented from being attenuated and the power consumption can be further reduced, so that the near infrared irradiation device can be used for a long time.

  According to the fourth aspect of the present invention, a visible light absorbing material that absorbs and attenuates visible light is disposed before or after the polarizer, and the purity of linearly polarized near-infrared radiation emitted from the irradiation port can be increased. Irradiation efficiency peculiar to infrared rays can be increased. Accordingly, since light can be emitted from a smaller light source, power consumption can be reduced and the device can be used for a long time.

  According to the fifth aspect of the present invention, since the light emitting source is a semiconductor light emitting source that emits one or more monochromatic near infrared rays, visible light is not included, and therefore the wavelength conversion material and the visible light absorption attenuation filter are arranged. There is no need for. Furthermore, since the semiconductor light emitting source emits light with low power and generates little heat, a heat radiating device such as a cooling fan is unnecessary, and thus the near infrared irradiation device can be reduced in size and weight. In addition, if a semiconductor light emitting source that emits a specific wavelength is used, high living body deepness can be achieved, and irradiation efficiency can be increased, so that power consumption can be reduced. As a result, the near-infrared irradiation device can be reduced in size and weight, and can be manufactured at a low price. In addition, a near-infrared irradiation device using a semiconductor light-emitting source emits light with low power and can be used for a long period of time with short power consumption, and is durable and small and lightweight, so it is easy to use and convenient. Examples of the semiconductor light emitting source include a light emitting diode and a semiconductor laser. The light emitting diode includes a light emitting diode of each wavelength and can be easily used. Semiconductor lasers can be safely used if they are diffused by a concave lens because they have high directivity and high light flux density.

  According to the sixth aspect of the present invention, since the light source is composed of a plurality of LED assemblies having different light emission wavelengths, an approximate spectrum in a wavelength region suitable for the purpose of use can be freely formed, and the irradiation efficiency can be improved. High near infrared rays can be irradiated. Accordingly, the irradiation efficiency can be increased and the power consumption can be further reduced, so that even a short charge can be used for a long time.

  According to the seventh aspect of the present invention, since the light emission controller is loaded in the cylindrical case, it is convenient to carry and can be used even if there is no commercial power supply if the power source used is a storage battery type or a dry battery type. Further, since the cylindrical case can be operated while being gripped with fingers, it can be irradiated at any place. In addition, since the light emission controller can be manufactured by being integrated into the cylindrical case, the number of manufactured parts can be reduced, the manufacturing process can be simplified, and the manufacturing cost can be reduced.

  According to the eighth aspect of the present invention, since the light emission controller is arranged separately from the cylindrical case, it is not necessary to protect the light emission controller from heat generation of the light source, and no cooling device is required. The cylindrical case can be reduced in size and weight. Therefore, the operability of the cylindrical case can be improved, and near infrared rays can be irradiated at any place. In addition, since the cylindrical case and the light emission controller are formed separately, each can be further reduced in size, and can be easily carried if the connecting cable is freely removed and arranged. Conversely, if the light emission controller is made larger, the irradiation efficiency of the cylindrical case can be further increased.

  Embodiments of a small near infrared irradiation device according to the present invention will be described below in detail with reference to the drawings.

Light is distributed with ultraviolet rays, visible rays, and infrared rays as the wavelength increases. Furthermore, infrared rays are divided into near infrared rays, middle infrared rays, and far infrared rays. Near infrared rays are in a wavelength range of about 0.65 to 1.5 microns, and mid infrared rays are in a wavelength range of about 1.5 to 5 microns. The far infrared rays are in the wavelength range of about 5 to 1000 microns. Far-infrared rays have been used in various ways because they react with H ₂ O contained in the skin when irradiated to the skin and effectively act on the surface of the skin. Contrary to this, near infrared rays have little interaction with H ₂ O, and thus have been rarely used. However, in recent years, the near-infrared penetration of near infrared rays has attracted attention, and the effectiveness of linearly polarized near-infrared therapy, For example, relieve pain in refractory alopecia areata and temporomandibular disorders, improve jaw opening, improve Raynaud's symptoms by irradiation in the vicinity of stellate ganglion, neuralgia after herpes zoster and herpes zoster Analgesic effects have been reported. Although it is almost unknown about the detailed action mechanics on the living body by near-infrared irradiation, it is involved in the blood vessel expansion and bioactive substance production promoting action by near-infrared irradiation, and also the inhibitory action on neural excitation, etc. It is thought to have an effect on analgesia, anti-inflammation and wound healing.

  In this way, linearly polarized near-infrared rays are recognized for their high utility in a wide range, but they can be used at home and at any time, not only in specialized institutions such as hospitals, but also in forest and natural baths. The near-infrared irradiation device according to the present invention is compact and lightweight, and is safe to handle so that it can be carried anywhere and easily operated by anyone. This near infrared irradiation device can be used not only for humans, animals and plants but also for inorganic substances, and can achieve various effects by near infrared irradiation.

  FIG. 1 is a schematic cross-sectional view of a small near-infrared irradiation device in which a light source according to the present invention emits visible light as a continuous spectrum together with near-infrared rays. The small near-infrared irradiation device 2 includes a light-emitting source 4 that emits visible light as a continuous spectrum together with near-infrared light on a portable cylindrical case 3 having a cross-sectional area and a length that can be grasped and operated by fingers. A wavelength conversion material 6 arranged around the source for converting visible light into near infrared, a polarizer 8 for linearly polarizing near infrared emitted from the light source, and a polarizer 8 and the light source 4 are disposed between the polarizer 8 and the light source 4. The visible light absorbing material 10 that absorbs and attenuates visible light, and the irradiation port 12 that transmits near-infrared light through the polarizer 8 and radiates it to the outside. A sapphire glass 14 is disposed between the irradiation port 12 and the polarizer 8 in order to protect the polarizer 8. Instead of the sapphire glass 14, other light-transmitting members can be used. For example, a light-transmitting member such as glass or plastic can be used. As this translucent member, a material having high thermal conductivity is preferable, and heat generated by near infrared rays can be released to the outside of the device through the cylindrical case 3, and the small near infrared irradiation device according to the present invention can be emitted. Stability and durability can be improved. The sapphire glass 14 has particularly high thermal conductivity among glasses. A light emission controller that controls light emission of the light emission source 4 is arranged outside and connected by a connection cable 16. Although not shown in FIG. 1, a cooling fan for cooling the heat generation behind the light emitting source can be considered.

  Examples of the light emission source 4 that emits visible light as a continuous spectrum together with near infrared rays include a halogen lamp, a tungsten lamp, and a xenon lamp. A xenon lamp is suitable for the present invention from the viewpoint of durability. The cross-section of the cylindrical case in which the light emitting source 4 is disposed includes a circle, an ellipse, a quadrangle, and the like, but a circle is preferable for constituting a reflection surface. Moreover, irradiation power can be increased by making the inside of the cylindrical case which permeate | transmits a near-infrared mirror finish. The shape of the cylindrical case includes a pen type and a pistol type that are easy to grasp.

The polarizer 8 that linearly polarizes near infrared rays is formed by sandwiching a polarizing film called a polarizing filter with polycarbonate. This polarizing filter is a film having grid-like slits in the lateral direction, and has a property of transmitting light in the horizontal plane but not transmitting light in the vertical plane. Therefore, if the emitted near infrared rays pass through the polarizer, only the light in the horizontal plane is transmitted and linearly polarized. As described above, various effects are known for linearly polarized near infrared rays.

  FIG. 2 is a continuous spectrum change diagram of a xenon lamp by the visible light absorbing material and the wavelength converting material according to the present invention. The vertical axis represents intensity (Intensity) in arbitrary units, and the horizontal axis represents wavelength (Wavelength) in nm. A short broken line A is a continuous spectrum of xenon lamp light including visible light as well as near infrared light having a wavelength range of 360 to 1000 nm. The long broken line B is a continuous spectrum of the xenon lamp light transmitted through the visible light absorbing material, and it can be seen that visible light having a wavelength of about 360 to 600 nm is absorbed by the visible light absorbing material. A solid line C is a continuous spectrum of xenon lamp light in which a wavelength band with visible light is converted by a wavelength converting material and visible light is absorbed by a visible light absorbing material. It can be seen that the intensity is increased in the near-infrared region as compared to the long broken line B.

  The visible light absorber 10 is made of a color glass plate, absorbs visible light having a wavelength of about 360 to 600 nm, and enhances near-infrared purity with high biological depth. The wavelength converting material 6 converts the wavelength of visible light to increase the near infrared irradiation power. In particular, a wavelength conversion material that can efficiently convert visible light in the red wavelength region among visible light is desirable.

  FIG. 3 is a schematic cross-sectional view of a compact near-infrared irradiation device in which the light-emitting source according to the present invention is a semiconductor light-emitting source. This small near-infrared irradiation device 20 includes a semiconductor light-emitting source 22, a semiconductor light-emitting element 23 that constitutes the semiconductor light-emitting source 22, a polarizer 24 that linearly polarizes monochromatic near-infrared radiation emitted from the semiconductor light-emitting element 23, The irradiation port 26 is configured to transmit infrared rays through the polarizer 24 and irradiate the infrared rays to the outside. In the irradiation port 26, a sapphire glass 28 is disposed between the irradiation port 26 and the polarizer 24 in order to protect the polarizer 24. A light emission controller that controls the light emission of the semiconductor light emitting source 22 is arranged outside and connected by a connection cable 30. Although not clearly shown in FIGS. 1 and 3, a condensing lens is provided inside the sapphire glass 28, and a two-stage cylindrical case is adjusted forward and backward to narrow the near-infrared luminous flux. Can do.

  Since the semiconductor light emitting source 22 emits light with low power and generates little heat, a cooling fan is unnecessary, and the near infrared irradiation device can be reduced in size and weight. In addition, it can be charged in a short time and can be irradiated for a long time. The semiconductor light emitting source 22 includes a light emitting diode and a semiconductor laser. Light emitting diodes include “red”, “yellow-green”, and “yellow” light emitting diodes, but “red” infrared light emitting diodes are preferred in the present invention. Semiconductor lasers can also be used safely if the output is adjusted.

  FIG. 4 is an approximate continuous spectrum diagram of a semiconductor light emitting source composed of a combination of LEDs that emit light having wavelengths of 650, 700, 750, 800, and 900 nm. The vertical axis represents intensity (Intensity: a.u.), and the horizontal axis represents wavelength (Wavelength: nm). A solid line 1A indicates the emission intensity of each LED at a wavelength of 650 nm, a solid line 2A indicates a wavelength of 700 nm, a solid line 3A indicates a wavelength of 750 nm, a solid line 4A indicates a wavelength of 800, and a solid line 5A indicates a wavelength of 900. As can be seen from FIG. 4, a semiconductor light-emitting source composed of an LED assembly having a wavelength of 650 to 900 nm can form an approximate continuous spectrum indicated by a dotted line B if the number of LEDs is increased. Therefore, it is possible to form and irradiate near infrared rays having an effective wavelength region according to the purpose of use.

FIG. 5 is a graph showing the relationship between the light emission time and the pause time of the light source according to the present invention. The vertical axis represents intensity (Intensity) in arbitrary units, and the horizontal axis represents time (S). In the embodiment, light is emitted for 20 seconds (T ₁ ) and stopped for 5 seconds (T ₂ ). The light emission time can be freely adjusted, and after the light emission is stopped for a certain time, irradiation by repeating this is more effective than continuous irradiation and is preferable from the viewpoint of heat dissipation and light emission efficiency.

  FIG. 6 is a schematic view of a small near infrared irradiation device (integrated type) in which the light emission controller according to the present invention is loaded in a cylindrical case. The small near infrared irradiation device 31 is configured by arranging a light emission source 32 and a light emission controller 34 in a cylindrical case, and the light emission controller 34 includes a control circuit 36 and a storage battery 38. The control circuit 36 includes a time control circuit and a voltage / current control circuit. Since 6, 8, 10, 12, and 14 are the same as those in FIG. This small near-infrared irradiation device (integrated type) can be carried and used anywhere by connecting to an external charger and charging.

  FIG. 7 is a schematic view of a small near infrared irradiation device (separated type) in which the light emission controller according to the present invention is connected to a cylindrical case by a connection cable. The small near infrared irradiation device 40 includes a cylindrical case 42 and a light emission controller 44, and is connected by a connection cable 46. Since the cylindrical case 42 and the light emission controller 44 are separately located, they can be reduced in size, and can be used anywhere if they can be carried anywhere and a power source is prepared.

  FIG. 8 is a current control block diagram of the small near infrared irradiation device according to the present invention. (8A) is a block diagram of a main control circuit of the small near infrared irradiation device. The control circuit 50 that controls the current of the light emission source 51 includes a time control circuit 52 and a voltage / current control circuit 54. (8B) is a current control block diagram of a small near-infrared irradiation device using a commercial power source as a power source. It is connected to an external commercial power source 56 to convert alternating current into direct current by a direct current converter 58 and controlled by the control circuit 50 to serve as an operating power source for the light source 51. Therefore, it can be used anywhere with the commercial power source 56. (8C) is a current control block diagram of a small near infrared irradiation device in which a storage battery is loaded in a cylindrical case. The storage battery 62 in the cylindrical case is charged by an external charger 60 connected to the commercial power source 56, and is controlled by the control circuit 50 to serve as an operating power source for the light emission source 51. Therefore, if the battery is charged, it can be used anywhere. (8D) is a current control block diagram of a small near-infrared irradiation device arranged so that a dry battery can be removed in a cylindrical case. The direct current of the dry battery 64 is controlled by the control circuit 50 to serve as an operating power source for the light source 51.

  Since the small near-infrared irradiation device of the present invention is large enough to be grasped and operated with fingers, it can be carried anywhere and used by anyone when needed, so it is not only used as a health appliance but also various usage methods Can be considered. For example, it can be used not only for animal disease treatment and plant growth improvement, but also for various actions that can use the heat effect generated by irradiation.

1 is a schematic cross-sectional view of a small near infrared irradiation device in which a light source according to the present invention emits visible light as a continuous spectrum together with near infrared rays. It is a continuous spectrum change figure of the xenon lamp by the visible light absorber and wavelength conversion material concerning the present invention. 1 is a schematic cross-sectional view of a small near infrared irradiation device in which a light emission source according to the present invention is a semiconductor light emission source. It is a continuous spectrum figure of the semiconductor light-emitting source which consists of the combination of LED which light-emits the light of wavelength 650-900 nm. It is a related figure of the light emission time of the light emission source concerning this invention, and rest time. It is a schematic diagram of the small near-infrared irradiation apparatus (integral type) by which the light emission controller which concerns on this invention is loaded in a cylindrical case. It is a schematic diagram of the small near-infrared irradiation apparatus (separation type) by which the light emission controller which concerns on this invention is connected with a cylindrical case with a connection cable. It is a current control block diagram of the small near infrared irradiation device according to the present invention.

Explanation of symbols

2 Small near infrared irradiation device 3 Cylindrical case 4 Light source 6 Wavelength conversion material 8 Polarizer 10 Visible light absorber 12 Irradiation port 14 Sapphire glass 16 Connection cable 20 Small near infrared irradiation device 22 Semiconductor light emitting source 23 Semiconductor light emitting element 24 Polarizer 26 Irradiation port 28 Sapphire glass 30 Connection cable 31 Small near-infrared irradiation device (integrated type)
32 Light emission source 34 Light emission controller 36 Control circuit 38 Battery 40 Small near infrared irradiation device (separate type)
42 cylindrical case 44 light emission controller 46 connection cable 50 control circuit 52 time control circuit 54 voltage / current control circuit 56 commercial power supply 58 DC converter 60 charger 62 storage battery 64 dry battery

Claims (8)

A portable cylindrical case having a cross-sectional area and a length that can be grasped and operated by a finger, a light emitting source that emits near-infrared rays arranged at a required position in the cylindrical case, and arranged in the cylindrical case A polarizer that linearly polarizes near infrared rays emitted from the light source, an irradiation port at the tip of the cylindrical case that radiates linearly polarized near infrared rays transmitted through the polarizer to the outside, and controls light emission of the light source. A compact near-infrared irradiation device, comprising at least a light emission controller, for irradiating an irradiated body with linearly polarized near-infrared radiation emitted from the irradiation port. The small near infrared irradiation device according to claim 1, wherein the light emitting source emits visible light as a continuous spectrum together with near infrared rays. The small near-infrared irradiation device according to claim 2, wherein a wavelength conversion material that converts visible light into near-infrared light is disposed around the light emitting source to amplify the intensity of near-infrared light incident on the polarizer. The small near infrared irradiation device according to claim 2 or 3, wherein a visible light absorbing material that absorbs and attenuates visible light is disposed before or after the polarizer to increase the purity of linearly polarized near infrared rays emitted from the irradiation port. 2. The small near infrared irradiation device according to claim 1, wherein the light emitting source is a semiconductor light emitting source that emits one or more monochromatic near infrared rays in a near infrared wavelength region. The small near-infrared irradiation device according to claim 5, wherein the light-emitting source is an LED combination, and the emission surfaces of a plurality of LEDs having different emission wavelengths are arranged in alignment with the emission direction of the cylindrical case. The small near infrared irradiation device according to any one of claims 1 to 6, wherein the light emission controller is loaded in the cylindrical case. The small near infrared irradiation device according to any one of claims 1 to 6, wherein the light emission controller is disposed separately from the cylindrical case, and the cylindrical case and the light emission controller are connected by a connection cable.

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