JP2013157239A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of suppressing deviation of laser beams from a defined beam light path.SOLUTION: A lighting system 1 includes: a fluorescent member 5 which emits fluorescence by being irradiated with laser beams as excitation light; and a body part 20 which forms a sealed space S1 where the fluorescent member 5 is arranged. Dry gas is enclosed in the sealed space S1.

Description

  The present invention relates to an illuminating device, and more particularly to an illuminating device including a fluorescent member that is irradiated with laser light that is excitation light.

  2. Description of the Related Art Conventionally, an illumination device including a fluorescent member that is irradiated with laser light that is excitation light is known. As an example of such an illuminating device, a semiconductor laser (excitation light source) that emits laser light that is excitation light, a fluorescent member that emits fluorescence when irradiated with laser light, and a reflecting mirror that reflects fluorescence toward the outside ( 2. Description of the Related Art A vehicular headlamp (illuminating device) including a reflecting member and a translucent member that transmits fluorescence and emits the light outside is known. Laser light emitted from the semiconductor laser is converted into fluorescence by the fluorescent member, passes through the light transmitting member, and is used as illumination light.

  In addition, the illuminating device provided with the excitation light source which radiate | emits a laser beam, and the fluorescent member to which a laser beam is irradiated is disclosed by patent document 1 and patent document 2, for example.

JP 2004-241142 A JP 2005-150041 A

  However, as a result of various studies on the conventional lighting device by the present inventor, there is a case where condensation occurs in the lighting device in the conventional lighting device, and the laser beam may deviate from the prescribed beam optical path due to the condensation. I found that a point exists. The defined beam path refers to the intended laser beam path in the laser product according to the definition of JIS C6802.

  This problem will be specifically described. Air can contain more water vapor at higher temperatures. When the temperature of the air decreases, the water vapor that can no longer be contained in the air adheres to the surface of the object having a low temperature as water droplets. This phenomenon is called condensation.

  For example, in the conventional illumination device, when the fluorescent member is irradiated with laser light, the temperature of the fluorescent member and its surroundings increases, and the temperature of the space surrounded by the reflecting mirror and the light transmitting member increases. The air in this space can contain more water vapor than before the temperature rises.

  When the space surrounded by the reflector and light-transmitting member is not sealed, when the lighting device is used in a high-humidity environment such as rainy weather, the air in the space rises in temperature and contains a lot of water vapor become. Thereafter, when the lighting device is stopped, the temperature of the fluorescent member and its surroundings is lowered, and the temperature of the space is lowered. Thereby, dew condensation occurs in the space. In this case, the next time the lighting device is used, the fluorescent member is irradiated with laser light in a state where condensation occurs in the space. If dew condensation occurs in the prescribed beam optical path (for example, the surface of the fluorescent member), the laser beam may be reflected or refracted by water droplets and deviate from the prescribed beam optical path.

  On the other hand, even when the space surrounded by the reflecting mirror and the translucent member is sealed, condensation occurs in the sealed space due to the relationship between the environment during the sealing operation and the environment during use. For example, when a lighting device assembled at 25 ° C. in a normal humidity environment is placed in an environment that greatly falls below 0 degrees, condensation occurs in the sealed space. For this reason, the laser beam may deviate from the prescribed beam optical path.

  When the laser beam deviates from the prescribed beam path as described above, there is a problem that desired illumination light may not be obtained, or the laser beam may be emitted to the outside and adversely affect human eyes. .

  In the illumination device that irradiates the fluorescent member with the laser beam and obtains the desired illumination light, there has not been found any prior literature that lists the problem that the laser beam deviates from the prescribed beam optical path due to condensation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illuminating device capable of suppressing the laser beam from deviating from the prescribed beam optical path. is there.

  In order to achieve the above object, an illumination device of the present invention includes a fluorescent member that emits fluorescence when irradiated with laser light that is excitation light, and a main body that forms a sealed space in which the fluorescent member is disposed, The sealed space is filled with dry gas or is in a vacuum.

  In this specification and claims, the term “sealed” refers to sealing so that gas cannot enter and exit, and the sealed space refers to a space sealed so that gas cannot enter and exit. say.

  As described above, the lighting device of the present invention includes the main body portion that forms the sealed space in which the fluorescent member is disposed, and the sealed space is filled with dry gas or is in a vacuum. As a result, it is possible to prevent dew condensation from occurring in the sealed space, and for example, it is possible to prevent water droplets from adhering to the surface of the fluorescent member. For this reason, it can suppress that a laser beam is reflected or refracted by a water droplet, and deviates from a regulation beam optical path. As a result, it is possible to prevent the desired illumination light from being obtained or the laser light from being emitted to the outside and adversely affecting the human eye.

  In addition, as described above, by disposing the fluorescent member in the sealed space, it is possible to suppress the fluorescent member from being deteriorated by moisture or the like.

  In the lighting device, preferably, a dry gas is sealed in the sealed space, and the dry gas includes dry air or an inert gas. In this way, by configuring the dry gas to include dry air or an inert gas, it is possible to easily prevent condensation in the sealed space. Moreover, since the inside of the sealed space is not evacuated by enclosing the dry gas in the sealed space, the main body can be prevented from being crushed by the external pressure.

  In the illuminating device, preferably, the main body includes a reflecting member that reflects fluorescence and a first light transmissive member that transmits the fluorescence and emits the light to the outside of the sealed space. If comprised in this way, the fluorescence radiate | emitted from the fluorescence member can be reflected in a predetermined direction by a reflection member, and a predetermined area | region can be illuminated easily.

  In the lighting device, preferably, the dew point in the sealed space is −30 ° C. or lower. For example, it is very rare that the annual minimum temperature falls below −30 ° C. in an area from north latitude 50 degrees to south latitude 50 degrees among areas where the lighting device is used. For this reason, if the dew point in the sealed space is set to −30 ° C. or lower, it is possible to sufficiently prevent dew condensation from occurring in the sealed space.

  In the illumination device, preferably, the excitation light source that emits laser light that is excitation light is disposed outside the sealed space, and the laser light from the excitation light source is introduced into the sealed space in the main body. The introduction part is provided. If comprised in this way, when the excitation light source is arrange | positioned outside the sealed space, the laser beam emitted from the excitation light source can be easily introduced into the sealed space.

  In the illumination device in which the introduction part is provided in the main body part, it is preferable to further include a light guide member that guides the laser light from the excitation light source to the sealed space. If comprised in this way, the laser beam radiate | emitted from the excitation light source can be easily guide | induced to sealed space.

  In the lighting device including the light guide member, preferably, the light guide member is inserted into the introduction portion without any gap. If comprised in this way, a light guide member can be inserted in sealed space, maintaining the sealing performance of sealed space, and the laser beam radiate | emitted from the excitation light source can be introduce | transduced easily in sealed space. .

  In the illuminating device in which the main body portion is provided with the introduction portion, preferably, the introduction portion is provided with a second light-transmitting member that transmits laser light without any gap. If comprised in this way, the laser beam radiate | emitted from the excitation light source can be easily introduce | transduced in sealed space, maintaining the sealing performance of sealed space.

  In the illumination device in which the introduction part is provided in the main body part, the optical path of the laser light from the excitation light source to the introduction part is preferably sealed.

  In the illumination device, preferably, the excitation light source that emits laser light that is excitation light is arranged in a sealed space. With this configuration, it is possible to prevent dew condensation from occurring in the entire prescribed beam optical path, and thus it is possible to prevent the laser light from deviating from the prescribed beam optical path.

  As described above, according to the present invention, it is possible to easily obtain an illuminating device capable of suppressing laser light from deviating from the prescribed beam optical path.

It is sectional drawing which showed the structure of the illuminating device of 1st Embodiment of this invention. It is sectional drawing which showed the structure of the illuminating device of 2nd Embodiment of this invention. It is sectional drawing which showed the structure of the illuminating device of 3rd Embodiment of this invention. It is sectional drawing which showed the structure of the illuminating device of the 1st modification of this invention. It is sectional drawing which showed the structure of the illuminating device of the 2nd modification of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In order to facilitate understanding, even a cross-sectional view may not be hatched.

(First embodiment)
With reference to FIG. 1, the structure of the illuminating device 1 of 1st Embodiment of this invention is demonstrated.

  The illuminating device 1 of 1st Embodiment of this invention is used as a headlamp which illuminates the front, such as a motor vehicle, for example. As shown in FIG. 1, the illumination device 1 includes an excitation light source 2 that emits laser light that is excitation light, a heat radiation member 3 to which the excitation light source 2 is fixed, and a light guide member 4 that is disposed in front of the excitation light source 2. A fluorescent member 5 that is irradiated with laser light (excitation light), a support member 6 that supports the fluorescent member 5, and a reflective member 7 that reflects the fluorescence emitted from the fluorescent member 5 toward the outside of the illumination device 1. And a bezel 8 fixed to the front end of the reflecting member 7 and a translucent member 9 (first translucent member) that transmits fluorescence and emits the light to the outside of the illumination device 1. In the present embodiment, the main body portion 20 is formed by the reflecting member 7, the bezel 8, the translucent member 9, and the like. A sealed space S <b> 1 is formed in the main body 20.

  The excitation light source 2 is a semiconductor laser, and is composed of a semiconductor laser element (not shown) and a package on which the semiconductor laser element is mounted. The excitation light source 2 is configured to emit laser light having a center wavelength of about 380 nm to about 460 nm, for example. The excitation light source 2 is disposed outside the sealed space S1.

  The heat radiating member 3 is formed of a metal block, for example, and has a function of radiating heat generated by the excitation light source 2. The heat radiating member 3 is provided as necessary, and an existing member may be substituted.

  The light guide member 4 has a function of guiding the laser light emitted from the excitation light source 2 to the sealed space S1. In the present embodiment, the light guide member 4 is formed of, for example, an optical fiber.

  A portion of the light guide member 4 on the laser light incident end face 4 a side is fixed to the excitation light source 2. A sealing member 10 is provided so as to seal the laser light incident end surface 4 a of the light guide member 4 and the laser light emitting surface of the excitation light source 2. The connection portion between the light guide member 4 and the excitation light source 2 is formed so that no condensation occurs on the optical path of the laser light. For example, a transparent seal member 10 may be filled between the laser light incident end surface 4 a of the light guide member 4 and the laser light emission surface of the excitation light source 2. Alternatively, the light guide member 4 may be a pigtail fiber, and the light guide member 4 and the excitation light source 2 may be pigtailed. Also in this case, the laser light incident end surface 4a of the light guide member 4 and the laser light emission surface of the excitation light source 2 are sealed, and condensation is formed on the optical path of the laser light at the connection portion between the light guide member 4 and the excitation light source 2. Can be prevented from occurring. For example, a resin or the like may be filled between the laser light incident end surface 4a of the light guide member 4 and the laser light output surface of the excitation light source 2, or the laser light incident end surface 4a of the light guide member 4 and the excitation light source 2 may be filled. A dry gas may be enclosed in a sealed space including the laser beam emission surface.

  In this way, by forming so as not to cause condensation on the optical path of the laser light at the connection portion between the light guide member 4 and the excitation light source 2, from the excitation light source 2 to the laser light emission surface 4 a of the light guide member 4. It is possible to prevent dew condensation on the optical path of the laser beam (the prescribed beam optical path).

  A portion of the light guide member 4 on the laser light emission end face 4b side is inserted into an introduction portion 7b of the reflection member 7 described later without a gap. For example, the seal member 11 is provided between the outer surface of the light guide member 4 and the inner surface of the introduction portion 7 b of the reflection member 7. The laser beam emitting end face 4b of the light guide member 4 is disposed in the sealed space S1.

  Further, the laser light emitting end surface 4b is arranged at a predetermined distance from the irradiation surface 5a on which the laser light of the fluorescent member 5 is irradiated. Thereby, since it can suppress that the light radiate | emitted from the irradiation surface 5a of the fluorescence member 5 injects into the laser beam emission end surface 4b of the light guide member 4 again, it suppresses that the utilization efficiency of light falls. Is possible.

  The fluorescent member 5 is disposed in the sealed space S1 and has a function of emitting fluorescence when irradiated with laser light (excitation light). The fluorescent member 5 emits fluorescence having a center wavelength longer than the wavelength of the excitation light. The fluorescent member 5 includes, for example, three types of phosphors (not shown) that convert blue-violet laser light into red light, green light, and blue light, respectively. And the white illumination light is obtained by mixing the fluorescence of the red light, the green light, and the blue light emitted from the fluorescent member 5. The fluorescent member 5 may include, for example, one type of phosphor that converts part of blue laser light into yellow light. Then, white illumination light may be obtained by mixing the yellow light and the blue light scattered by the fluorescent member 5. As the fluorescent member 5, it is possible to use a material obtained by mixing a phosphor with glass, resin, or the like, or a material obtained by pressurizing or sintering phosphor particles.

  The support member 6 includes a holding portion 6 a that holds the side surface 5 b of the fluorescent member 5 and a plurality of rod-like attachment portions 6 b that are attached to the bezel 8. The holding part 6a may hold the side surface of the fluorescent member 5 directly, or may hold it through an adhesive layer or the like. The attaching portion 6b may be attached to the reflecting member 7.

  The support member 6 is formed of a material having high thermal conductivity such as metal or graphite. The support member 6 is configured to radiate heat generated in the fluorescent member 5 to the bezel 8, the reflection member 7, a metal block (not shown), and the like.

  The reflection member 7 has a function of reflecting light (fluorescence or scattered light) emitted from the fluorescent member 5 toward the outside. The reflecting surface 7a of the reflecting member 7 is formed in a concave shape, for example, so as to include a part of a parabolic surface. Further, the irradiation surface 5a of the fluorescent member 5 is disposed in a region including the focal point of the reflection surface 7a. In addition, an introduction portion 7 b for introducing laser light (excitation light) emitted from the excitation light source 2 is formed at a predetermined position (for example, apex) of the reflecting member 7. The reflecting member 7 is made of metal or resin. When the reflecting member 7 is formed of resin, the reflecting surface 7a may be formed of a metal film or the like.

  The bezel 8 is formed in a cylindrical shape, for example, and is fixed to the front end of the reflecting member 7 without a gap by using a bolt 12 or a screw (not shown). The bezel 8 is made of metal or resin. The inner surface 8a of the bezel 8 is preferably formed of a reflecting surface having a function of reflecting light.

  The translucent member 9 is made of a lens (for example, a plano-convex lens) and is made of glass or resin. The translucent member 9 is fixed to the inner surface 8a of the bezel 8 without a gap. A seal member (not shown) may be provided between the outer surface of the translucent member 9 and the inner surface 8 a of the bezel 8.

  A dry gas is enclosed in the sealed space S1 so as not to condense. Thereby, all of the optical path of the laser light (specified beam optical path) from the excitation light source 2 to the fluorescent member 5 is sealed, and the dew condensation is prevented from occurring in all of the optical path of the laser light (specified beam optical path). It is possible. As the dry gas, dry air with very little water vapor, or an inert gas such as nitrogen or argon may be used. The dew point in the sealed space S1 is, for example, −30 ° C. or less, and the inside of the sealed space S1 does not condense within the use environment temperature (or operation guarantee temperature) of the lighting device 1. In addition, the dry gas in the sealed space S1 is at or above the atmospheric pressure (at least 1 atm).

  In the present embodiment, as described above, the main body portion 20 that forms the sealed space S1 in which the fluorescent member 5 is disposed is provided, and the dry space is sealed in the sealed space S1. As a result, it is possible to prevent dew condensation in the sealed space S1, and thus it is possible to prevent water droplets from adhering to the irradiation surface 5a of the fluorescent member 5 and the laser light emitting end surface 4b of the light guide member 4. . For this reason, it can suppress that a laser beam is reflected or refracted by a water droplet, and deviates from a regulation beam optical path. As a result, it is possible to prevent the desired illumination light from being obtained or the laser light from being emitted to the outside and adversely affecting the human eye.

  Moreover, as described above, the fluorescent member 5 can be prevented from being deteriorated by moisture or the like by arranging the fluorescent member 5 in the sealed space S1. For example, since the phosphor is composed of sulfide and deteriorates due to moisture, it is particularly effective when the phosphor is composed of sulfide.

  In addition, as described above, when the dry gas includes dry air or inert gas, it is possible to easily prevent condensation in the sealed space S1. Moreover, since the inside of the sealed space S1 is not evacuated by sealing the dry gas in the sealed space S1, it is possible to suppress the main body portion 20 from being crushed by the external pressure. Further, the dry gas in the sealed space S1 is at or above the atmospheric pressure (at least 1 atm). Thereby, in the unlikely event that the sealing property of the sealed space S1 cannot be maintained (for example, when a small hole is opened in the main body 20), the outside air containing water vapor is prevented from flowing into the sealed space S1. be able to.

  Further, as described above, the dew point in the sealed space S1 is −30 ° C. or lower. For example, in Japan, the annual minimum temperature is very rarely below -30 ° C. For this reason, if the dew point in sealed space S1 shall be -30 degrees C or less, it can fully prevent that dew condensation arises in sealed space S1.

  Further, as described above, by providing the introduction part 7b in the main body part 20 (reflection member 7), the laser light emitted from the excitation light source 2 can be easily introduced into the sealed space S1.

  Further, as described above, by providing the light guide member 4, the laser light emitted from the excitation light source 2 can be easily guided to the sealed space S1.

  Moreover, as described above, the light guide member 4 is inserted into the introduction portion 7b without any gap. Accordingly, the light guide member 4 can be inserted into the sealed space S1 while maintaining the sealing performance of the sealed space S1, and the laser light emitted from the excitation light source 2 can be easily introduced into the sealed space S1. it can.

  Further, as described above, the prescribed beam optical path from the excitation light source 2 to the laser light emitting surface 4a of the light guide member 4 is sealed. Thereby, it is possible to prevent dew condensation from occurring in the prescribed beam optical path from the excitation light source 2 to the laser light emitting surface 4a of the light guide member 4. As a result, it is possible to prevent dew condensation from occurring in all of the specified beam optical path (the optical path of the laser light from the excitation light source 2 to the fluorescent member 5), thereby preventing the laser light from deviating from the specified beam optical path. Can do.

  In addition, since the temperature of the member having high thermal conductivity is lowered before the member having low thermal conductivity, dew condensation is likely to occur on the surface of the member having high thermal conductivity. Usually, a metal member is used around the fluorescent member to improve heat dissipation. Therefore, when the reflecting member is made of resin, condensation tends to occur around the metal member. Considering the case where the space is not sealed with the configuration of the present embodiment, for example, condensation is likely to occur on the surface of the support member 6. For this reason, water drops may flow from the metal member (supporting member 6) to the fluorescent member 5, and the laser light may be reflected by the water drops and deviate from the specified beam optical path. Further, when the reflecting member 7 is made of metal, condensation tends to occur on the inner surface (reflecting surface 7a) of the reflecting member 7. In this case, water droplets adhering to the inner surface (reflecting surface 7a) of the reflecting member 7 may fall on the fluorescent member 5 and the laser light may deviate from the specified beam optical path. In the present embodiment, as described above, it is possible to prevent dew condensation in the sealed space S1, so that even when a member having high thermal conductivity is used around the fluorescent member 5, for example, the laser is used. It is possible to suppress the light from deviating from the specified beam optical path.

(Second Embodiment)
In the second embodiment, as shown in FIG. 2, a case where the light guide member 104 is formed of a lens will be described.

  The illuminating device 101 of 2nd Embodiment of this invention is the support which supports the excitation light source 2, the heat radiating member 3, the light guide member 104 arrange | positioned ahead of the excitation light source 2, the fluorescent member 5, and the fluorescent member 5. A member 106, a reflection member 107 that reflects the fluorescence emitted from the fluorescent member 5 toward the outside, and a translucent member 109 (first translucent member) that transmits the fluorescence and emits it to the outside are provided. In the present embodiment, a main body 120 is formed by the reflecting member 107, a translucent member 113, a support member 106, and a translucent member 109 described later. A sealed space S101 is formed in the main body 120.

  The light guide member 104 is formed by a lens (for example, a biconvex lens). The light guide member 104 is disposed outside the main body 120 (outside the sealed space S101).

  The support member 106 can be formed of metal or resin, but at least the peripheral portion (holding portion 106a) of the fluorescent member 5 is formed of a material having high thermal conductivity such as metal. The holding part 106a is configured to dissipate heat generated in the fluorescent member 5 to the entire support member 106, a metal member (not shown), or the like. Moreover, it is preferable that the inner surface (surface which forms sealed space S101) 106b of the supporting member 106 is formed with the reflective surface which has the function to reflect light.

  The reflecting member 107 has a function of reflecting the fluorescence emitted from the fluorescent member 5 toward the outside. The reflecting surface 107a of the reflecting member 107 is formed so as to include a part of the paraboloid, for example, and the paraboloid is divided by a plane parallel to the axis connecting the apex and the focal point (the paraboloid rotating axis). It is formed in such a shape. In addition, an introduction portion 107 b for introducing laser light (excitation light) emitted from the excitation light source 2 is formed at a predetermined position of the reflection member 107.

  The introducing portion 107b is provided with a light transmitting member 113 (second light transmitting member) that transmits at least laser light (excitation light) without any gap. The translucent member 113 is made of, for example, quartz, other inorganic glass, or resin. The translucent member 113 may be configured to reflect the fluorescence emitted from the fluorescent member 5. If comprised in this way, it will become possible to prevent that a fluorescence returns to the excitation light source 2 side, Therefore It is possible to improve the utilization efficiency of light.

  The translucent member 109 is made of, for example, flat glass or resin. The translucent member 109 may be formed of a lens. The translucent member 109 is fixed to the reflecting member 107 and the support member 106 without a gap.

  A dry gas is sealed in the sealed space S101 so as not to condense. Note that, for example, a seal member is provided at an interface portion between the members forming the sealed space S101 (for example, between the side surface of the translucent member 113 and the inner surface of the introduction portion 107b) as necessary.

  Other structures of the second embodiment are the same as those of the first embodiment.

  In the present embodiment, as described above, the introducing portion 107b is provided with the light transmitting member 113 that transmits the laser light without any gap. Thereby, the laser beam emitted from the excitation light source 2 can be easily introduced into the sealed space S101 while maintaining the sealing performance of the sealed space S101.

  Further, as described above, the translucent member 113 may be made of quartz or other inorganic glass. Quartz and other inorganic glasses have higher thermal conductivity than resin. For this reason, if the case where the space is not sealed with the configuration of the present embodiment is considered, dew condensation is likely to occur on the inner surface of the translucent member 113. For this reason, there is a possibility that the laser beam is reflected or refracted by the water droplet and deviates from the specified beam optical path. In the present embodiment, as described above, it is possible to prevent dew condensation from occurring in the sealed space S101. Therefore, even when a member having high thermal conductivity is used as the translucent member 113, for example, laser light is used. Can be prevented from deviating from the prescribed beam path.

  Other effects of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
In the illumination device 201 of the third embodiment, unlike the second embodiment, a cover member 214 is provided so as to cover the excitation light source 2 and the light guide member 104. The cover member 214 is attached to the reflecting member 107. The cover member 214 has a function of shielding excitation light, and is made of, for example, resin or metal.

  Other structures of the third embodiment are the same as those of the second embodiment.

  In the present embodiment, as described above, by providing the cover member 214 that covers the excitation light source 2, dew condensation occurs outside the sealed space S101 (for example, the laser light incident surface of the translucent member 113), and the laser light is transmitted to the specified beam. Even when the light beam deviates from the optical path, the laser beam can be easily prevented from being emitted to the outside of the illumination device 201.

  Other effects of the third embodiment are the same as those of the second embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the example which used the illuminating device of this invention for the headlamp of the motor vehicle was shown, this invention is not restricted to this. You may use the illuminating device of this invention for the headlamp of an airplane, a ship, a robot, a motorcycle or a bicycle, and another moving body.

  Moreover, in the said embodiment, although the example which applied the illuminating device of this invention to the headlamp was shown, this invention is not restricted to this. You may apply the illuminating device of this invention to a downlight, a spotlight, and another illuminating device. Moreover, you may apply the illuminating device of this invention to the bulb-type illuminating device in which the reflection member is not provided, for example.

  Moreover, although the example which converted excitation light into visible light was shown in the said embodiment, this invention is not limited to this, You may convert excitation light into light other than visible light. For example, when the excitation light is converted into infrared light, it can also be applied to a night illumination device of a security CCD camera.

  Moreover, in the said embodiment, although the example which comprised the excitation light source and the fluorescent member so that white light was radiate | emitted was shown, this invention is not limited to this. The excitation light source and the fluorescent member may be configured to emit light other than white light.

  In the above embodiment, an example in which a semiconductor laser is used as an excitation light source that emits laser light has been described. However, the present invention is not limited to this, and an excitation light source other than a semiconductor laser may be used.

  In the above embodiment, an example in which the reflecting surface of the reflecting member is formed by a part of a paraboloid has been shown. However, the present invention is not limited to this, and the reflecting surface may be formed by a part of an elliptical surface, for example. Good. In this case, the light emitted from the illumination device can be easily condensed by positioning the irradiation region of the fluorescent member at the focal point of the reflecting surface. Further, the reflecting surface may be formed by a multi-reflector composed of a large number of curved surfaces (for example, a parabolic surface) or a free curved surface reflector provided with a large number of fine planes continuously.

  Moreover, although the said embodiment demonstrated the case where the dew point in sealed space was -30 degrees C or less, this invention is not limited to this. If dew condensation does not occur within the use environment temperature (or operation guarantee temperature) of the lighting device, the dew point in the sealed space may be, for example, −10 ° C. or lower, −20 ° C. or lower, or −40 ° C. or lower.

  In the third embodiment, for example, the excitation light source 2 and the light guide member 104 are simply covered with the cover member 214. However, the present invention is not limited to this. For example, the cover member 214 may be fixed to the reflecting member 107 using a seal member, and the inside of the cover member 214 may be a sealed space in which, for example, dry air is sealed. If comprised in this way, the excitation light source 2 can be arrange | positioned in sealed space, and the optical path of the laser beam from the excitation light source 2 to the introducing | transducing part 107b can be sealed. As a result, as in the first embodiment, all of the optical path (specified beam optical path) of the laser light from the excitation light source 2 to the fluorescent member 5 can be sealed, and condensation occurs in all of the specified beam optical path. Therefore, the laser beam can be prevented from deviating from the prescribed beam optical path. When the inside of the cover member 214 is a sealed space, the light transmitting member 113 may not be provided as in the lighting device 301 of the first modification example of the present invention illustrated in FIG. In this case, the reflecting member 107, the cover member 214, the support member 106, the translucent member 109, and the like constitute the main body 320 that forms the sealed space S301, and the excitation light source 2 and the fluorescent member 5 are disposed in the sealed space S301. The

  Moreover, in the said embodiment, although the example using an optical fiber and a lens as a light guide member was shown, this invention is not limited to this. A reflective mirror or the like may be used as the light guide member, or a plurality of optical fibers, lenses, and reflective mirrors may be used in combination. The light guide member is provided as necessary. For example, the excitation light source 2 is arranged in the vicinity of the fluorescent member 5 as in the illumination device 401 of the second modified example of the present invention shown in FIG. Is not necessary. In the illumination device 401, the reflection member 107, the support member 106, the translucent member 109, and the like constitute the main body 420 that forms the sealed space S401, and the excitation light source 2 and the fluorescent member 5 are disposed in the sealed space S401. . Since the excitation light source 2 is disposed in the sealed space S401, it is possible to prevent dew condensation from occurring in the entire prescribed beam optical path, as in the case of the illumination device 301. Thereby, it is possible to prevent the laser light from deviating from the prescribed beam optical path.

  Moreover, in the said embodiment, although the example which enclosed dry gas in sealed space was shown, this invention is not restricted to this, You may make the inside of sealed space vacuum. Also in this case, it is possible to easily prevent dew condensation from occurring in the sealed space.

  Further, a configuration obtained by appropriately combining the configurations of the above-described embodiment and modification examples is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 101, 201, 301, 401 Illumination device 2 Excitation light source 4, 104 Light guide member 5 Fluorescent member 7, 107 Reflective member 7b, 107b Introduction part 9, 109 Translucent member (1st translucent member)
20, 120, 320, 420 Main body 113 Light transmissive member (second light transmissive member)
S1, S101, S301, S401 Sealed space

Claims (10)

A fluorescent member that emits fluorescence when irradiated with laser light as excitation light;
A main body forming a sealed space in which the fluorescent member is disposed;
With
The sealed space is filled with dry gas or is in a vacuum. The dry gas is enclosed in the sealed space,
The lighting device according to claim 1, wherein the dry gas includes dry air or an inert gas.   3. The illumination according to claim 1, wherein the main body portion includes a reflection member that reflects the fluorescence and a first light transmission member that transmits the fluorescence and emits the fluorescence to the outside of the sealed space. apparatus.   The illuminating device according to claim 1, wherein a dew point in the sealed space is −30 ° C. or lower. An excitation light source that emits laser light that is the excitation light is disposed outside the sealed space,
The lighting device according to claim 1, wherein the main body portion is provided with an introduction portion for introducing laser light from the excitation light source into the sealed space. .   The illumination device according to claim 5, further comprising a light guide member that guides laser light from the excitation light source to the sealed space.   The lighting device according to claim 6, wherein the light guide member is inserted into the introduction portion without any gap.   The lighting device according to claim 5 or 6, wherein a second translucent member that transmits the laser light is provided in the introduction portion without a gap.   The illumination device according to claim 5, wherein an optical path of the laser light from the excitation light source to the introduction portion is sealed.   The illumination device according to claim 1, wherein an excitation light source that emits laser light that is the excitation light is disposed in the sealed space.

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