Patent Publication Number: US-2013241393-A1

Title: Luminaire and manufacturing method of the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No.2012-062524, filed on Mar. 19, 2012; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate generally to a luminaire and a manufacturing method of the same. 
     BACKGROUND 
     A luminaire using a semiconductor light source has low power consumption and long life. Thus, the luminaire rapidly comes into wide use as a luminaire for replacing a fluorescent lamp or an incandescent lamp. For example, a luminaire in which a blue light-emitting diode (LED) as the semiconductor light source is sealed with resin is small and easy to handle, and a desired light color can be obtained by selecting a phosphor contained in the resin. 
     As a specific form, a Chip-On-Board (COB) type luminaire in which plural LED chips are mounted on a board becomes mainstream. A manufacturing process of the COB type luminaire uses, for example, a method in which a bank surrounding LEDs is provided on the board and a sealing resin is poured therein, or a method in which a sealing resin is potted on the respective LED chips. However, in the method of using the bank, the bank which does not emit light limits a luminous intensity distribution characteristic, and light extracting efficiency may be reduced. On the other hand, in the method of potting the sealing resin, it is difficult to suppress the fluctuation of light-emitting color. Then, a luminaire is required in which a desired light characteristic can be stably obtained at a low cost. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A and 1B  are schematic sectional views showing a luminaire of a first embodiment. 
         FIGS. 2A to 2C  are plan views schematically showing light-emitting parts of the luminaire of the first embodiment. 
         FIGS. 3A to 3C  are plan views schematically showing light-emitting parts of a modified example of the first embodiment. 
         FIG. 4  is a plan view schematically showing a light-emitting part of the modified example of the first embodiment. 
         FIG. 5  is a flowchart showing a manufacturing process of the luminaire of the first embodiment. 
         FIG. 6  is a schematic sectional view showing a light-emitting part of a luminaire of a second embodiment. 
         FIGS. 7A to 7C  are plan views schematically showing the light-emitting parts of the luminaire of the second embodiment. 
         FIGS. 8A to 8C  are plan views schematically showing light-emitting parts of a modified example of the second embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     In general, according to one embodiment, a luminaire includes plural semiconductor light sources mounted on a board, sealing bodies provided on the respective semiconductor light sources, and a light color adjusting part to adjust light color emitted from the plural sealing bodies. The sealing bodies contain a phosphor excited by a primary light emitted from the semiconductor light sources. The light color adjusting part contains the phosphor and is provided between arbitrary adjacent sealing bodies, or is provided by causing a shape or a characteristic of an arbitrary sealing body among the plural sealing bodies to be different from that of another sealing body. 
     Hereinafter, embodiments will be described with reference to the drawings. Incidentally, the same portion in the drawings is denoted by the same reference numeral to suitably omit the detailed description thereof, and a different portion will be described. 
     First Embodiment 
       FIG. 1A  is a schematic sectional view showing a luminaire  100  of a first embodiment. As shown in the drawing, the luminaire  100  is, for example, a bulb-type lamp, and includes a light-emitting part  110 , a housing  3 , and a cover  5  covering the light-emitting part  110 . 
     A power conversion part  7  to supply power to the light-emitting part  110  is provided inside the housing  3 , and is electrically connected to the light-emitting part  110  and a cap  9  through a lead wire  15 . The power conversion part  7  is housed in an insulating case  13  provided inside the housing  3 . 
     The power conversion part  7  is supplied with AC power from not-shown commercial power supply through the cap  9 , converts the power into, for example, DC power and supplies the power to the light-emitting part  110 . 
     As shown in  FIG. 1B , the light-emitting part  110  includes plural semiconductor light sources  30  mounted on a board  20 , and a sealing part  40  to seal the semiconductor light sources  30 . The sealing part  40  contains a phosphor excited by a primary light emitted from the semiconductor light sources  30 , and includes wavelength converting parts  45  provided on the respective plural semiconductor light sources  30 . As the sealing part  40 , for example, the phosphor is dispersed in an organic or inorganic matrix. As the organic matrix, for example, resin can be named. 
     Here, the wavelength converting part is a thick portion of the sealing part  40  (for example, resin) sealing the semiconductor light source  30 , and is a portion where wavelength conversion of the primary light is performed by the phosphor. However, the wavelength conversion of the primary light by the phosphor is not performed only in the wavelength converting part. Besides, the sealing part including the wavelength converting part may be such that as shown in the embodiment, sealing bodies  70  (see  FIG. 6 ) to seal the semiconductor light sources  30  are provided to be close to each other and are mutually connected to form a continuous body, or as described later, the sealing bodies  70  to seal the semiconductor light sources  30  are provided separately from each other, and each of them is the wavelength converting part. 
     The board  20  includes an insulating base member  21 , a thermal radiating layer  23  selectively provided on an upper surface of the base member  21 , conductive layers  25  and  27 , and an insulating reflecting layer  35 . The thermal radiating layer  23  and the conductive layers  25  and  27  are, for example, copper foils, and silver plating layers  29  are formed on surfaces thereof. The silver plating layer  29  reflects upward the primary light from the semiconductor light source  30  and fluorescent light emitted by the phosphor contained in the sealing part  40 . The reflecting layer  35  is provided around the thermal radiating layer  23  and the conductive layers  25  and  27 . Besides, the reflecting layer  35  is, for example, a white resist, and reflects upward the primary light from the semiconductor light source  30  and the fluorescent light emitted by the phosphor. 
     The semiconductor light source  30  is, for example, a blue LED chip made of a GaN nitride semiconductor and formed on a sapphire board, and is mounted on the thermal radiating layer  23 . Each semiconductor light source  30  includes a not-shown p-electrode and n-electrode on an upper surface thereof, and is electrically connected to each other through a metal wire  39 . 
     The conductive layers  25  and  27  are respectively a positive electrode and a negative electrode, and are electrically connected to the semiconductor light source  30  through the metal wire  39 . For example, the conductive layers  25  and  27  are connected to back electrodes  31  and  32  via through-holes  33  provided in the base member  21 . The electrodes  31  and  32  are connected to the power conversion part  7  through the lead wire  15 . 
     The semiconductor light sources  30  are supplied with the DC power from the power conversion part  7  through the conductive layers  25  and  27 , and respectively emit blue light. The phosphor contained in the sealing body  40  is, for example, YAG phosphor (Yttrium Aluminum Garnet phosphor), is excited by the blue light emitted by the semiconductor light sources  30 , and emits yellow fluorescent light. 
     The sealing part  40  is such that for example, resin containing silicone as its main component is mixed with phosphor, and is potted on each of the plural semiconductor light sources  30 . The sealing part  40  has thixotropy, and preferably has a Shore hardness D40 or higher after hardening. By this, the sealing part  40  can be provided to have a specific shape. Besides, deformation by outer force is suppressed, and breaking of the metal wire  39  can be prevented. 
     For example, the section of the potted sealing part  40  perpendicular to the upper surface of the board  20  has a dome shape between a triangle and a semicircle. In this embodiment, the semiconductor light sources  30  are mounted at high density, and an arrangement interval (arrangement pitch) W 1  thereof is narrow. Thus, resins potted on the semiconductor light sources  30  are mutually connected, and the sealing part  40  is provided to have a continuous shape including the wavelength converting parts  45  corresponding to the positions of the semiconductor light sources  30 . 
     For example, a ratio (that is, an aspect ratio) obtained by dividing a height H 1  of the wavelength converting part  45  from the upper surface of the board  20  by the arrangement pitch W 1  of the semiconductor light sources  30  is preferably 0.2 or more and 1.0 or less. By this, a luminous intensity distribution angle is widened and a color difference between side and front can be reduced. 
     Further, the sealing part  40  contacts the reflecting layer  35  provided around the thermal radiating layer  23  and the conductive layers  25  and  27 . For example, an adhesion force of the sealing part  40  to the silver plating layer  29  is low as compared with the reflecting layer  35  formed of ceramic or resin and is liable to be peeled. Thus, an outer peripheral part of the sealing part  40  is made to adhere to the reflecting layer  35 , so that the adhesion strength can be enhanced, and peeling from the board  20  can be suppressed. 
     Besides, a resin having low gas permeability is preferably used as the sealing part  40 . For example, the silver plating layer  29  may react with sulfur or moisture in the outer air and is blackened. By this, the reflectance to the primary light from the semiconductor light source and the fluorescent light is reduced, and the light output (light flux maintaining ratio) is reduced. Accordingly, it is desirable that the sealing part  40  covering the silver plating layer  29  shuts off the outer air and suppresses the blackening. 
       FIG. 2A  to  FIG. 2C  are plan views schematically showing the light-emitting part  110  of the first embodiment. The sealing part  40  provided on the board  20  includes the wavelength converting parts  45  and light color adjusting parts  55 . The light color adjusting part  55  adjusts the color of outgoing light in which the primary light from the semiconductor light source  30  and the fluorescent light emitted by the phosphor are mixed. The light color adjusting part  55  contains, for example, the same resin as the wavelength converting part  45  as its main component. 
       FIG. 2A  is a plan view showing a standard arrangement (first sealing part) of the wavelength converting parts  45  and the light color adjusting parts  55 . As shown in the drawing, the sealing part  40  covers the thermal radiating layer  23  and the conductive layers  25  and  27 , and an outer edge thereof contacts the reflecting layer  35 . The wavelength converting parts  45  correspond to the positions of the semiconductor light sources  30  mounted on the thermal radiating layer  23 , and are formed into, for example, a matrix shape. The light color adjusting parts  55  are provided at positions deviating from the regularity of the arrangement of the wavelength converting parts  45 . Besides, as shown in  FIG. 2A , the light color adjusting parts  55  are provided at the center part of the sealing part  40 . 
     The light color adjusting parts  55  can be formed by potting the resin containing the phosphor in spaces between the adjacent semiconductor light sources  30 . The light color adjusting part  55  contains the phosphor emitting fluorescent light with a longer wavelength than the blue light emitted by the semiconductor light source  30 . Besides, in the standard arrangement shown in  FIG. 2A , although four light color adjusting parts  55  are provided at the center part of the sealing part  40 , no limitation is made to this example, and an arbitrary number of light color adjusting parts  55  may be provided in an arbitrary arrangement. 
       FIG. 2B  and  FIG. 2C  show arrangement examples (second sealing part) of the light color adjusting parts  55  after color adjustment is performed. For example, if the color temperature of the outgoing light in the standard arrangement is lower than a specific value, as shown in  FIG. 2B , the number of the light color adjusting parts  55  arranged at the center part of the sealing part  40  is reduced, so that the amount of phosphor is reduced and the color temperature is raised. For example, as shown in  FIG. 2B , if two light color adjusting parts  55  are provided, the light color adjusting parts are preferably provided on a diagonal line in a plane arrangement of the semiconductor light sources  30 . 
     On the other hand, if the color temperature of the outgoing light in the standard arrangement is higher than the specific value, as shown in  FIG. 2C , in addition to the light color adjusting parts  55  arranged at the center part of the sealing part  40 , the light color adjusting parts  55  are provided also at a peripheral part. By this, the amount of the phosphor is increased and the color temperature can be lowered. Also in this case, the light color adjusting parts  55  are preferably provided on the diagonal line in the plane arrangement of the semiconductor light sources  30 . 
     The light color adjusting parts  55  are arranged at the center part of the sealing part  40  and are provided on the diagonal line in the plane arrangement of the semiconductor light sources  30 , so that the emitted light from the light-emitting part  110  becomes uniform, and the color difference between side and front can be reduced. 
       FIG. 3A  to  FIG. 3C  are plan views schematically showing a light-emitting part  120  of a modified example of the first embodiment. 
       FIG. 3A  is a plan view showing a standard arrangement of the wavelength converting parts  45 . The sealing part  40  covers the thermal radiating layer  23  and the conductive layers  25  and  27 , and the outer edge thereof contacts the reflecting layer  35 . The wavelength converting parts  45  are formed into, for example, a matrix shape. Besides, the standard arrangement shown in  FIG. 3A  does not include the light color adjusting part  55 . 
     For example, when the color temperature of outgoing light in the standard arrangement is lower than a specific value, as shown in  FIG. 3B , the amount of resin of wavelength converting parts  57  arranged at the periphery of the sealing part  40  is reduced, so that the amount of phosphor is reduced and the color temperature is raised. 
     As shown in  FIG. 3B , the wavelength converting parts  57  are preferably provided on a diagonal line in the plane arrangement of the semiconductor light sources  30 . Besides, the wavelength converting parts  57  containing a small amount of phosphor are preferably provided at the peripheral part in the plane arrangement of the semiconductor light sources. By this, uniformity of emitted light from the light-emitting part  120  is maintained, and the color difference between side and front can be suppressed. 
     On the other hand, if the color temperature of the outgoing light in the standard arrangement is higher than the specific value, as shown in  FIG. 3C , the light color adjusting parts  55  are provided at the center part of the sealing part  40 , so that the amount of phosphor is increased and the color temperature is reduced. Also in this case, the light color adjusting parts  55  are preferably provided on the diagonal line in the plane arrangement of the semiconductor light sources  30 . 
     As stated above, the amount of phosphor contained in the wavelength converting parts  57  is reduced, so that the light color of the outgoing light of the light-emitting part  120  can be adjusted. Accordingly, the wavelength converting parts  57  are also one of the light color adjusting parts. The wavelength converting part  57  may be formed by potting resin in which the content of phosphor is reduced. Besides, the composition of phosphor contained in the wavelength converting part  57  may be different from that of phosphor contained in the wavelength converting part  45 . 
     Further, as shown in  FIG. 4 , wavelength converting parts  59  may be provided as the light color adjusting parts. The amount or composition of phosphor contained in the wavelength converting part  59  is different from the amount or composition of phosphor contained in the wavelength converting part  45 . For example, in the standard arrangement shown in  FIG. 3A , if the color temperature is lower than the specific value, the wavelength converting part  59  in which the content of phosphor is small is potted instead of the wavelength converting part  45 . Besides, the wavelength converting part  59  containing phosphor emitting fluorescent light having a shorter wavelength than the wavelength converting part  45  may be provided. 
     On the other hand, in the standard arrangement shown in  FIG. 3A , if the color temperature is higher than the specific value, the wavelength converting part  59  in which the content of phosphor is large may be provided, or the wavelength converting part  59  containing phosphor emitting fluorescent light having a longer wavelength than the wavelength converting part  45  may be provided. 
     As stated above, in the sealing part  40 , the portion including the light color adjusting part is different from the portion surrounding the light color adjusting part in at least one of the regularity of roughness, the shape of roughness, the amount of phosphor and the composition of phosphor. That is, the light color adjusting part  55  containing the phosphor may be provided between arbitrary wavelength converting parts  45 , or the shape or the characteristic of an arbitrary wavelength converting part  45  may be made different from that of another wavelength converting part. By this, the light color of the light-emitting parts  110  and  120  is adjusted and the fluctuation thereof can be suppressed. 
     Next, a manufacturing method of the luminaire  100  will be described with reference to  FIG. 5 .  FIG. 5  is a flowchart showing the manufacturing process of the luminaire  100 . 
     First, the semiconductor light sources  30  are mounted on the board  20  (Act  01 ). Specifically, plural LED chips are fixed to a surface of the thermal radiating layer  23  by, for example, silver paste. Then, four or five LED chips are connected in series to each other through the metal wires  39  between the conductive layers  25  and  27 . 
     Next, a proceeding lot (first board) on which the semiconductor light sources  30  are mounted is sealed (Act  02 ). Specifically, the wavelength converting parts  45  and the light color adjusting parts  55  are formed according to the standard arrangement shown in  FIG. 2A  or  FIG. 3A . Subsequently, the optical characteristic (for example, color temperature) of the preceding lot is checked (Act  03 ). 
     Next, based on the result of the light characteristic check, necessity of color adjustment is determined (Act  04 ). For example, if the color temperature deviates from an allowable range, and the color adjustment is determined to be necessary, the arrangement of the light color adjusting parts is determined (Act  05 ). If the color temperature is low, the light color adjusting part  55  is removed, and if the color temperature is high, the light color adjusting part  55  is added, and the color temperature is adjusted. By this, the preferable arrangement of the light color adjusting parts is determined, and a succeeding lot (second board) is sealed with resin (Act  06 ). 
     In the light characteristic check of the preceding lot, if the color adjustment is determined to be unnecessary, the succeeding lot is sealed with resin according to the standard arrangement. Subsequently, the light-emitting part in which the resin sealing is completed is assembled in the housing, and the luminaire  100  is completed (Act  07 ). 
     By the above manufacturing process, the luminaire in which the fluctuation of light color and the color difference between side and front are suppressed can be manufactured. Besides, if the lot in which sealing is precedently performed does not have a desired light color, the resin of the light color adjusting part is increased or decreased, so that the light color adjustment can be performed. By this, the waste of phosphor and resin is eliminated, and the manufacturing cost can be reduced. 
     Second Embodiment 
       FIG. 6  is a schematic sectional view showing a light-emitting part  130  of a luminaire of a second embodiment. The light-emitting part  130  includes plural semiconductor light sources  30  mounted on a board  60 , and sealing bodies  70  to seal the semiconductor light sources  30 . The sealing bodies  70  are potted on the respective semiconductor light sources  30 , and contain phosphor excited by primary light from the semiconductor light source  30 . In this embodiment, the adjacent sealing bodies  70  are provided to be separated from each other. Besides, the wavelength converting part in this embodiment is the whole sealing body  70 . 
     The board  60  includes a metal base  63 , an insulating layer  65  covering an upper surface of the metal base  63 , conductive layers  67  and  69  selectively provided on the insulating layer  65 , and insulating reflecting layers  83  and  85 . The conductive layers  67  and  69  are, for example, copper foils, and silver plating layers  71  are formed on surfaces thereof. The silver plating layer  71  reflects upward the primary light from the semiconductor light source  30  and fluorescent light emitted by the phosphor contained in the sealing body  70 . The reflecting layers  83  and  85  are provided around the conductive layers  67  and  69 , and reflect upward the primary light from the semiconductor light source  30  and the fluorescent light emitted by the phosphor. 
     The reflecting layer  83  (first layer) is, for example, a white resist, and has a high reflectivity to the primary light from the semiconductor light source  30  and the fluorescent light emitted by the phosphor. The reflecting layer  85  (second layer) is, for example, a white ceramic containing silica, and has higher adhesiveness to the sealing body  70  than the reflecting layer  83 . By this, the adhesive strength of the sealing body  70  to the board  60  is improved and peeling is suppressed. 
     The semiconductor light source  30  is mounted on the conductive layer  69 , and a p-electrode and an n-electrode on an upper surface thereof are electrically connected to the conductive layers  67  and  69  through a metal wire  75 . The semiconductor light sources  30  mounted on the adjacent conductive layers  69  are electrically connected to each other by not-shown wiring. 
     The sealing body  70  is, for example, a resin containing silicone as its main component, and includes YAG phosphor (Yttrium Aluminum Garnet phosphor). Besides, the sealing body  70  has thixotropy, and preferably has Shore hardness D40 or higher after hardening. By this, the sealing body  70  can be provided to have a specific shape. Besides, deformation by outer force is suppressed, and breaking of the metal wire  75  can be prevented. 
     As shown in  FIG. 6 , the section of the sealing body  70  perpendicular to an upper surface of the board  60  has a dome shape between a triangle and a semicircle. For example, an aspect ratio obtained by dividing a height H 2  of the sealing body  70  from the upper surface of the board  60  by a diameter W 2  of the bottom thereof is preferably 0.2 or more and 1.0 or less. By this, a luminous intensity distribution angle is widened, and a color difference between side and front can be reduced. 
     Further, the sealing body  70  contacts the reflecting layer  85  provided around the respective conductive layers  67  and  69 . By this, the adhesion strength of the sealing body  70  at an outer peripheral part is enhanced, and peeling can be prevented. Besides, a resin having low gas permeability is used as the sealing body  70 . By this, blackening of the silver plating layer  71  is suppressed. 
       FIG. 7A  to  FIG. 7C  are plan views schematically showing the light-emitting part  130  of the second embodiment. The sealing bodies  70  and light color adjusting parts  80  are provided on the board  60 . The light color adjusting part  80  adjusts the color of outgoing light in which the primary light from the semiconductor light source  30  is mixed with the fluorescent light emitted by the phosphor contained in the sealing body  70 . The light color adjusting part  80  contains, for example, the same resin as the sealing body  70 . 
       FIG. 7A  is a plan view showing a stand arrangement of the sealing bodies  70  and the light color adjusting parts  80 . As shown in the drawing, the sealing bodies  70  correspond to the positions of the semiconductor light sources  30  mounted on the conductive layer  69 , and are formed into, for example, a matrix shape. The light color adjusting part  80  contains phosphor to emit fluorescent light having a longer wavelength than the blue light emitted by the semiconductor light source  30 . The light color adjusting parts  80  are provided at, for example, positions deviated from the regularity of the arrangement of the sealing bodies  70 . Besides, the light color adjusting parts  80  are provided at the center part of the plane arrangement of the semiconductor light sources  30 . 
     In the standard arrangement shown in  FIG. 7A , although four light color adjusting parts  80  are provided at the center part of the arrangement of the sealing bodies  70 , no limitation is made to this example. An arbitrary number of light color adjusting parts  80  may be provided in an arbitrary arrangement. 
       FIG. 7B  and  FIG. 7C  show arrangement examples of the light color adjusting parts  80  after color adjustment is performed. For example, if the color temperature of the outgoing light in the standard arrangement is lower than a specific value, as shown in  FIG. 7B , the number of the light color adjusting parts  80  is reduced, so that the amount of phosphor is reduced, and the color temperature is raised. As shown in  FIG. 7B , if two light color adjusting parts  80  are provided, the light adjusting parts are preferably provided on a diagonal line in the plane arrangement of the semiconductor light sources  30 . 
     On the other hand, if the color temperature of the outgoing light in the standard arrangement is higher than the specific value, as shown in  FIG. 7C , in addition to the light color adjusting parts  80  arranged at the center part of the arrangement of the semiconductor light sources  30 , the light color adjusting parts  80  are provided also at a peripheral part. By this, the amount of phosphor is increased and the color temperature can be lowered. Also in this case, the light color adjusting parts  80  are preferably provided on the diagonal line in the plane arrangement of the semiconductor light sources  30 . By this, the outgoing light from the light-emitting part  130  becomes uniform, and the color difference between side and front can be suppressed. 
       FIG. 8A  to  FIG. 8C  are plan views schematically showing a light-emitting part  140  of a modified example of the second embodiment.  FIG. 8A  is a plan view showing a standard arrangement of the sealing bodies  70 .  FIG. 8B  and  FIG. 8C  show arrangement examples of the light color adjusting parts  80  after color adjustment is performed. 
     In the standard arrangement shown in  FIG. 8A , the sealing bodies  70  are formed into a matrix shape, and the light color adjusting part  80  is not included. 
     For example, if the color temperature of the outgoing light in the standard arrangement is lower than a specific value, as shown in  FIG. 8B , the semiconductor light sources  30  arranged at an outer periphery are sealed with sealing bodies  90  in which the amount of resin is reduced. By this, the amount of phosphor is reduced, and the color temperature can be raised. 
     As shown in  FIG. 8B , the sealing bodies  90  are preferably provided on a diagonal line in the plane arrangement of the semiconductor light sources  30 . Besides, the sealing bodies  90  are preferably provided at a peripheral part in the plane arrangement of the semiconductor light sources  30 . By this, uniformity of the outgoing light from the light-emitting part  140  is maintained, and the color difference between side and front can be suppressed. 
     On the other hand, if the color temperature of the outgoing light in the standard arrangement is higher than the specific value, as shown in  FIG. 8C , the light color adjusting parts  80  are provided at the center part of the arrangement of the semiconductor light sources  30 . By this, the amount of phosphor is increased and the color temperature can be lowered. Also in this case, the light color adjusting parts  80  are preferably provided on the diagonal line in the plane arrangement of the semiconductor light sources  30 . 
     As stated above, the sealing bodies  90  in which the amount of resin is reduced are provided, so that the light color of the outgoing light of the light-emitting part  140  can be adjusted. Accordingly, the sealing bodies  90  are also one of the light color adjusting parts. Besides, the content of phosphor in the sealing body  90  may be reduced, or the composition of phosphor may be changed. As stated above, the light color adjusting part in the second embodiment is constructed by providing the irregular portion in at least one of the regularity of arrangement of the sealing bodies  70  (wavelength converting part), the shape, the amount of phosphor, and the composition of phosphor. 
     In the first embodiment and the second embodiment, although the description is made while using the bulb type lamp as an example of the luminaire, no limitation is made to this, and a spot light or a base light may be used. Besides, the respective components described in the first embodiment and the second embodiment are mutually combined, and can also be carried out in another form. 
     Although exemplary embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. Indeed, these novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions and changes can be made within the scope not departing from the gist of the invention. These embodiments and modifications thereof fall within the scope and the gist of the invention and fall within the scope of the invention recited in the claims and their equivalents.