JP2009205852A - Illumination fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact illumination fixture in which heat radiation property can be enhanced and light leakage is prevented even when the irradiation direction of light is directed vertically downward. <P>SOLUTION: The illumination fixture has a nearly cylindrical upper case, and on the lower side of the upper case, a lower case 2 is mounted in a state that housing spaces are communicated with each other. The rear face of the lower case 2 is composed of: an inclined wall 2b which extends from the rear end edge of the upper case, and intersects diagonally against front and rear directions; and a vertical wall 2a extending from the rear end edge of the inclined wall 2b, wherein on the vertical wall 2a and the inclined wall 2b, heat dissipation holes 2c, 2d are penetrated and installed, respectively. Moreover, inside the lower case 2, light-shielding plates 16, 17 are respectively mounted so as to face the heat dissipation holes 2d, 2c, the light-shielding plate 16 is in parallel with the inclined wall 2b, and arranged so as not to be overlapped with part of the heat dissipation hole 2d in the normal direction, and the light-shielding plate 17 is inclined and arranged so as to protrude obliquely forward as it goes away from the inclined wall 2b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting apparatus having a large output power, such as a spotlight.

  Conventionally, a spotlight that prevents light leakage from a heat radiating hole that radiates heat generated by a lamp has been provided (see, for example, Patent Document 1). The spotlight has a plurality of heat radiating holes formed in the front surface, a light source unit housed in the front and rear, and a lens attached to the front surface so that the body opening is closed. A fixture plate having a cover to be attached is provided, and a fixed plate constituting a moving unit for moving the light source in the front-rear direction is disposed between the heat radiation hole and the light source in the front-rear direction. The light from the light source is prevented from leaking to the outside through the heat dissipation hole.

A spotlight that prevents light leakage from a plurality of heat radiation holes provided on the rear surface side of the upper case is also provided. This spotlight has a substantially cylindrical upper case that is open on the front side, and a lower case that is attached to the upper case so that the storage space inside each other communicates. The light source is slidably disposed in the front-rear direction (light irradiation direction), and a ballast for supplying power to the light source is housed in the lower case. In addition, a plurality of heat radiating holes are provided in the rear surface of the upper case (the surface opposite to the opening), and a light shielding plate is disposed inside the rear surface so as to overlap the plurality of heat radiating holes in the front-rear direction. Yes. In this spotlight, heat generated by the light source and the ballast is radiated to the outside through a plurality of heat radiation holes, and light from the light source is prevented from leaking from the heat radiation holes to the outside by a light shielding plate.
JP-A-7-169303 (paragraph [0010] -paragraph [0015] and FIGS. 1 to 3)

  The spotlight is rotatable about an axis so that the light irradiation direction can be adjusted. In the spotlight shown in the above-mentioned Patent Document 1, a heat radiation hole is provided on the front surface (light irradiation side). Therefore, for example, when the irradiation direction is set vertically downward, the heat generated by the lamp moves upward and is trapped inside the instrument main body, which may reduce the heat dissipation.

  In the latter spotlight, when the irradiation direction is set vertically downward, the heat generated by the light source can be released to the outside from the heat radiating hole on the rear surface of the upper case, but the heat generated by the ballast moves upward. Therefore, it becomes difficult for the upper case and the lower case to move from the connecting portion to the upper case side. As a result, heat is trapped in the upper portion of the lower case, and there is a possibility that the heat dissipation performance may be reduced.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to achieve a small size that can improve heat dissipation even when the light irradiation direction is vertically downward, and prevent light leakage. It is to provide a lighting apparatus.

  According to the first aspect of the present invention, a first opening having an opening for irradiating light from a light source disposed therein to the outside is rotatably held around an axis so as to change an irradiation direction. A storage unit and a second storage unit that is attached to the first storage unit in a state in which a ballast that supplies lighting power to the light source is stored and the internal storage space is in communication with the inside of the first storage unit; Provided, the rear surface of the second storage part extends rearward from the rear edge of the first storage part, and obliquely intersects the front-rear direction, and the rear edge of the first side wall. The first and second side walls are provided with first and second heat radiating holes for releasing the heat inside the second storage portion to the outside. First and second light-shielding plates having light-shielding properties inside face the first and second heat radiation holes, respectively. The first light shielding plate is arranged in parallel with the first side wall and so as not to overlap a part of the first heat radiating hole in the normal direction. It is arranged to be inclined so as to protrude obliquely forward as it gets farther from the side wall.

  According to the first aspect of the present invention, by providing the first and second light shielding plates, it is possible to prevent light from the light source incident from the first housing portion side from leaking from the first and second heat radiation holes. In addition, even when the light irradiation direction is vertically downward, the heat inside the second storage portion can be released to the outside from the first and second heat radiation holes, and the first light shielding plate is connected to the first side wall. Since it is arranged in parallel and so as not to overlap a part of the first heat radiation hole in the normal direction, a heat radiation path is formed to directly release the heat inside the second storage part to the outside, and the heat radiation performance is improved. In addition, since the second light-shielding plate is disposed so as to protrude obliquely forward as it moves away from the first side wall, the heat inside the second storage portion is caused to follow the second light-shielding plate. The heat dissipation path leading to the first heat dissipation hole is formed and heat dissipation is improved. There is a result. Furthermore, by providing a heat radiating hole in the second storage portion itself in which the ballast is stored, the second storage portion can be reduced in size because it is not necessary to provide a sufficient storage space. There exists an effect that a lighting fixture can be provided.

  An embodiment of the present invention will be described with reference to FIGS. The lighting apparatus of the present embodiment is a spotlight used in, for example, a stage or a studio, and irradiates light from the lamp 10 disposed inside by rotating the apparatus main body around an axis as will be described later. The direction can be changed. In the following description, unless otherwise specified, the direction of the arrow ab in FIG. 3 is the front-rear direction, the direction of the arrow cd is the left-right direction, and the direction of the arrow ef is the up-down direction.

  As shown in FIGS. 2 to 4, the lighting fixture of the present embodiment includes a substantially cylindrical upper case 1 (first storage portion) and a lower case 2 (second storage portion) attached to the lower side of the upper case 1. ), A lamp 10 (light source) disposed inside the upper case 1, a reflecting mirror 9 disposed behind the lamp 10 to reflect light from the lamp 10 to the front side, and the lamp 10 And a ballast 8 for supplying lighting power.

  The upper case 1 has a substantially cylindrical shape with the front-rear direction as an axial direction and has a case body 1a with an open front surface, and a plurality of heat radiation holes 3a are provided in the rear cover 3 that closes the rear surface of the case body 1a. Has been. Moreover, the bearing part 1b for pivotally supporting the front cover 5 mentioned later is provided in the left end of the front side of the case main body 1a. An operation handle 4 is attached to the rear surface of the rear lid 3. By operating the operation handle 4 in the vertical direction, the instrument main body (the upper case 1 and the lower case 2) is rotated about its axis to transmit light. The irradiation direction can be changed, and the inside of the rear lid 3 (between the rear surface of the rear lid 3 and the rear end of the upper case 1 in FIG. 2) is formed of a light-shielding material. The light shielding plate 12 is disposed so as to overlap with the plurality of heat radiation holes 3a in the front-rear direction, so that light from the lamp 10 does not leak to the outside from the heat radiation holes 3a. Further, the above-described heat radiating hole 3a is provided for releasing the heat inside the instrument body to the outside, and heat generated when the lamp 10 is turned on, heat from the ballast 8 and the like are radiated from the heat radiating hole. 3a is discharged to the outside.

  Further, as shown in FIGS. 3 and 4, a substantially U-shaped arm 20 is pivotally supported by shaft portions (not shown) provided on both side portions of the upper case 1 in the left-right direction. The instrument body can be rotated about its axis. Further, a screw portion is provided on the left shaft portion, and a fixed handle 21 is screwed to the screw portion. After the instrument body is rotated to a desired angle with respect to the arm 20, the screw portion is fixed. By rotating the handle 21 in the clockwise direction, the position (angle) of the instrument main body with respect to the arm 20 can be fixed.

  Next, the front lid 5 includes a substantially rectangular holding frame 5a and a cylindrical portion 5b provided behind the holding frame 5a, and a condensing lens made of, for example, a Fresnel lens on the rear surface side of the cylindrical portion 5b. 11 (see FIG. 2) is attached, and reflectors 7a and 7b are rotatably attached to the four sides of the holding frame 5a. Here, the reflectors 7a and 7b are for reflecting the light irradiated to the outside through the condenser lens 11 in a desired direction. In the lighting fixture of this embodiment, the fixture body is rotated around its axis. The light irradiation direction can be adjusted by moving the light, and the angle of the reflectors 7a and 7b can be further adjusted.

  Further, a shaft portion 5c that is pivotally supported by the bearing portion 1b of the upper case 1 described above is provided at the left end of the tubular portion 5b, and the shaft portion 5c is pivotally supported by the bearing portion 1b, thereby The lid 5 is attached to the front side of the upper case 1 so as to be freely opened and closed. Here, the front lid 5 is provided for putting a hand into the upper case 1 during maintenance such as lamp replacement.

  The lower case 2 has an upper storage portion 2e having a substantially rectangular box shape in which an upper surface is opened and upper portions of both side walls in the front-rear direction are cut out in an arc shape so as to follow a side wall of the case body 1a of the upper case 1. The lower storage portion 2f is formed in a substantially rectangular box shape integrally formed from the lower end edge of the portion 2e, and the storage spaces inside each other communicate with each other when attached to the upper case 1.

  As shown in FIGS. 1 and 2, the rear surface of the lower storage portion 2f extends rearward from the rear edge of the upper storage portion 2e and obliquely intersects with the front-rear direction (that is, the upper storage portion 2e It consists of an inclined wall 2b (first sidewall) inclined obliquely downward from the rear edge and a standing wall 2a (second sidewall) extending from the rear edge of the inclined wall 2b. A heat radiating hole 2d (first heat radiating hole) is formed in the standing wall 2a, and a plurality of heat radiating holes 2c (second heat radiating holes) are respectively provided therethrough. Heat released from the heat radiation hole 8a of the ballast 8 accommodated in the portion 2f, heat generated when the lamp 10 is turned on, etc.) are released to the outside.

  Here, the light shielding plates 16 and 17 formed of a light-shielding material are disposed inside the lower storage portion 2f so as to face the heat radiation holes 2d and 2c, respectively. As shown in FIG. 1, the light shielding plate 16 (first light shielding plate) is formed by integrally folding a substantially rectangular plate-shaped light shielding piece 16a and a substantially L-shaped attachment piece 16b for attaching to the inclined wall 2b. The light shielding piece 16a is arranged in parallel to the inclined wall 2b by being bent and attached to the inclined wall 2b via the attachment piece 16b. Further, the light shielding piece 16a is positioned so that its lower end portion is positioned above the lower end edge of the lowermost heat radiation hole 2d provided in the inclined wall 2b in the vertical direction (left and right direction in FIG. 1) (inclined wall). 2b in the normal direction of 2b so as not to overlap a part of the heat radiation hole 2d).

  On the other hand, as shown in FIG. 1, the light shielding plate 17 (second light shielding plate) includes a substantially rectangular plate-shaped light shielding piece 17a and a substantially L-shaped mounting piece 17b for attaching to the standing wall 2a. The light shielding piece 17a is bent and formed so as to protrude obliquely forward as it goes downward (away from the inclined wall 2b) by being attached to the standing wall 2a via the attachment piece 17b. Here, a black matte coating is applied to the surface of the light shielding plate 17 so that the light from the lamp 10 is reflected by the surface of the light shielding piece 17a and does not leak outside through the heat radiating holes 2d on the inclined wall 2b side. ing. The light shielding plates 16 and 17 described above are fixed to the inclined wall 2b and the standing wall 2a by fixing members 18 such as screws and rivets as shown in FIG.

  Next, as shown in FIG. 2, the upper storage portion 2e stores a moving mechanism for sliding the lamp 10 and the reflecting mirror 9 in the front-rear direction. The moving mechanism includes a pair of slide shafts 13 (only one is shown in FIG. 2) arranged in the front-rear direction (vertical direction in FIG. 2), and a moving base 14 that moves in the front-rear direction along the slide shaft 13. It has. One slide shaft 13 is formed with a spiral groove 13a along the longitudinal direction, and an engagement protrusion (not shown) that engages with the groove 13a at a portion corresponding to the groove 13a on the moving base 14. Is provided. The other slide shaft is disposed on the opposite side to the slide shaft 13 described above with respect to the movable table 14, and the movable table 14 rotates around the slide shaft 13 so that the movable table 14 can slide in the front-rear direction. It is restricted from moving. An operation handle 15 is attached to the rear end portion of the slide shaft 13, and the slide shaft 13 is rotated by rotating the operation handle 15, and at this time, the engaging protrusion of the movable base 14 is moved to the slide shaft 13. By moving along the groove 13a, the moving base 14 slides in the front-rear direction.

  On the other hand, a lamp 10 is attached to the upper surface of the movable table 14 via a lamp socket 22, and a reflecting mirror 9 having a curved reflecting surface that protrudes rearward is attached to the rear of the lamp 10. Yes. Then, by rotating the operation handle 15 and moving the movable table 14 in the front-rear direction, the lamp 10 and the reflecting mirror 9 can be moved in the front-rear direction. The lamp socket 22 and the output end (not shown) of the ballast 8 are connected by an electric wire (not shown), and the lighting power output from the output end of the ballast 8 passes through the lamp socket 22. Via the lamp 10.

  In addition, a pair of limit switches 19 (only one is shown in FIG. 2) that is turned on / off in accordance with the open / close state of the front lid 5 is disposed in front of the moving mechanism in the upper storage portion 2e. An internal contact (not shown) of each limit switch 19 is connected between each primary side input terminal (not shown) and the commercial power source. Accordingly, when the front lid 5 is closed, an actuator (not shown) of each limit switch 19 is pushed by an operating piece (not shown) provided on the front lid 5 side, so that the internal contact is turned on and the ballast 8 is connected to the power source and the front cover 5 is opened. On the contrary, the actuator is not pushed by the operation piece, so the internal contact of each limit switch 19 is turned off. Thus, each input terminal on the primary side of the ballast 8 and the power source are cut off.

  In the lighting fixture of the present embodiment, the light shielding plates 16 and 17 are arranged inside the lower case 2 (lower storage portion 2f) so as to face the heat radiation holes 2d and 2c, respectively, so that the light enters from the upper case 1 side. The light from the lamp 10 can be prevented from leaking to the outside through the heat radiation holes 2d and 2c, and the heat inside the lower case 2 can be released to the outside through the heat radiation holes 2d and 2c even when the light irradiation direction is vertically downward. (For example, a heat dissipation path indicated by a two-dot chain line C or a broken line D in FIG. 1). Moreover, since the light shielding piece 16a of the light shielding plate 16 is arranged in parallel with the inclined wall 2b and so as not to overlap a part of the heat radiation hole 2d in the normal direction of the inclined wall 2b, A heat dissipation path (solid line A in FIG. 1) for releasing heat directly to the outside is formed to improve heat dissipation, and the light shielding piece 17a of the light shielding plate 17 is inclined so as to protrude obliquely forward as it is further away from the inclined wall 2b. Therefore, a heat radiation path (one-dot chain line B in FIG. 1) for guiding the heat inside the lower case 2 along the light shielding piece 17a to the heat radiation hole 2d on the inclined wall 2b side is formed, and the heat radiation performance is improved. improves.

  Further, by providing the heat radiating holes 2c and 2d in the lower case 2 (lower storage portion 2f) itself in which the ballast 8 is stored, the lower case 2 can be reduced in size because it is not necessary to provide a storage space. As a result, a downsized luminaire can be provided.

It is a principal part detailed sectional view of the lighting fixture of this embodiment. It is sectional drawing same as the above. It is the perspective view which looked at the same from the front side. It is the perspective view which looked at the same from the back side.

Explanation of symbols

1 Upper case (first storage part)
2 Lower case (second storage part)
2a Standing wall (second side wall)
2b Inclined wall (first side wall)
2c Heat dissipation hole (second heat dissipation hole)
2d Heat dissipation hole (first heat dissipation hole)
8 Ballast 10 Lamp (light source)
16 Shading plate (first shading plate)
17 Light shielding plate (second light shielding plate)

Claims (1)

A first storage portion having an opening on the front surface for irradiating light from a light source disposed inside to the outside, and rotatably held around an axis so as to change the irradiation direction; A ballast for supplying lighting power is housed, and includes a second housing portion attached to the first housing portion in a state in which the interior housing space communicates with the inside of the first housing portion,
A rear surface of the second storage part extends rearward from a rear edge of the first storage part and obliquely intersects with the front-rear direction, and a rear edge of the first side wall. The first and second side walls are provided with first and second heat radiating holes for releasing the heat inside the second storage portion to the outside. The first and second light-shielding plates having light-shielding properties are arranged inside the storage portion so as to face the first and second heat radiation holes, respectively.
The first light shielding plate is arranged in parallel to the first side wall and so as not to overlap a part of the first heat radiation hole in the normal direction, and the second light shielding plate is formed of the first light shielding plate. A lighting apparatus, wherein the lighting apparatus is arranged so as to protrude obliquely forward as it is farther from one side wall.

Images