JP2009110717A - Lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus that ensures a well-balanced lighting effect without causing color phase irregularity on a plane to be irradiated irrespective of the irradiation direction. <P>SOLUTION: The lighting apparatus comprises an appliance body 1, a straight tube-shaped light source 2, a reflecting mirror 5 in a shape approximate to the paraboloid of revolution, a socket 30, an arm 3 which supports the appliance body 1 so as to be freely rotatable relative to an axis along the longitudinal direction of the light source 2 while housing the socket 30 at one end, and a case 4 to house a ballast 40 for supplying lighting power to the light source 2 via the socket 30. The light source 2 has an arc tube 21 in which a pair of electrodes are held in a discharge space formed in a translucent vessel and noble gas and halide are filled in the discharge space, and a light distribution section 50 that is arranged so that a central axis in the radial direction at a focal position of the reflecting mirror 5 is approximately orthogonal to a central axis of the reflecting mirror 5 and forms a microscopic uneven shape over the whole surface of the reflecting mirror 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting fixture having a reflecting mirror that reflects light from a light source and irradiates reflected light to the outside.

  Conventionally, there has been provided a lighting fixture (spotlight) that obtains high illuminance by reflecting light from a light source with a reflecting mirror formed in a substantially rotating paraboloid and concentrating the reflected light in a relatively narrow range. For example, it is disclosed in Patent Document 1. Hereinafter, a conventional example of such a lighting fixture will be described with reference to the drawings. In the following description, the vertical direction in FIG. 5 is defined as the vertical direction, the horizontal direction along the longitudinal direction of the case 4 is defined as the horizontal direction, the front side of the paper is defined as the front direction, and the back side of the paper is defined as the rear direction.

  In this conventional example, as shown in FIG. 5, a bottomed cylindrical instrument body 1 having an open front surface and a straight tube and an axis along the longitudinal direction (left-right direction) coincide with the horizontal direction. A light source 2 housed inside the instrument body 1 and a socket (not shown) to which the right end of the light source 2 is detachably attached are provided, and the instrument body 1 is centered on the optical axis of the light source 2 at the lower end. And a case 4 that houses a ballast (not shown) that supports the upper end of the arm 3 and supplies lighting power to the light source 2 through a socket.

  The light source 2 is an arc tube (not shown) in which a pair of electrode portions are held in a discharge space formed inside a translucent ceramic container, and a rare gas and a halide are enclosed in the discharge space. A so-called ceramic metal halide lamp. A reflection mirror 5 that reflects light from the light source 2 is provided on the inner bottom surface of the instrument main body 1 that faces the opening. The reflecting mirror 5 is a reflecting mirror formed in a substantially rotational paraboloid shape with an axis passing through the center of the opening as a central axis, and reflects the light from the light source 2 and irradiates the outside through the opening. .

Thus, the case 4 is attached and fixed to the ceiling or the like, and an external power source (not shown) and a ballast are connected via the plug 6 provided on the upper surface of the case 4 so that the light source can be connected via the socket. The lighting power can be supplied to 2, and the light from the light source 2 and its reflected light can be irradiated in a desired direction and range by rotating the instrument body 1.
JP 2003-141916 A

  By the way, when a lighting fixture such as the above-mentioned conventional example is installed on the ceiling or the like, since the optical axis of the arc tube always coincides with the horizontal direction, halides such as iodide enclosed in the arc tube are not in a volatile state. Settles on the inner surface of the arc tube on the gravity direction side. When the light source 2 is a ceramic metal halide lamp, the precipitate is usually a yellowish liquid, and the light from the light source 2 is emitted through the precipitate, so that the yellowish light is emitted. Will be. This yellowish light is reflected by the reflecting mirror 5 and reaches the irradiated surface.

  However, in the above conventional example, when the light irradiated through the deposit is reflected by the reflecting mirror 5 and irradiated on the irradiated surface, the irradiated surface is partially irradiated. There is a problem in that unevenness of color occurs due to partial yellowing, and therefore a uniform lighting effect cannot be obtained.

  The present invention has been made in view of the above points, and provides a lighting apparatus capable of obtaining a uniform lighting effect without causing color unevenness on the irradiated surface regardless of the irradiation direction. Objective.

  In order to achieve the above object, the invention according to claim 1 is provided on an instrument main body formed of a box having an opening on one side, a long light source housed inside the instrument main body, and an inner surface facing the opening in the instrument main body. A substantially parabolic reflecting mirror that reflects light from the light source and irradiates the light through the opening, a socket on which a base provided at one end of the light source is detachably mounted, and one end A socket is housed in the unit, and an arm that rotatably supports the instrument body about an axis along the longitudinal direction of the light source, and the other end of the arm are supported, and lighting power is supplied to the light source through the socket. The light source includes a case containing a ballast, and the light source includes a pair of electrode portions held in a discharge space formed inside a light-transmitting container, and a rare gas and a halogen in the discharge space. monster It is provided with an enclosed arc tube and is arranged so that the central axis in the radial direction is substantially perpendicular to the central axis of the reflecting mirror at the focal position of the reflecting mirror. A light distribution unit is provided.

  According to the present invention, since the fine uneven light distribution portion is provided over the entire surface of the reflecting mirror provided on the inner surface facing the opening in the instrument body, the halide that precipitates on the inner bottom surface of the arc tube of the light source Light with a color attributed to the halide irradiated through the light can be reflected evenly in any of the upper, lower, left, and right directions in the light distribution section, and therefore the uneven color on the irradiated surface regardless of the irradiation direction. It is possible to obtain a uniform lighting effect that does not cause any problem.

  Hereinafter, embodiments of a lighting apparatus according to the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the conventional example, common parts are denoted by the same reference numerals. In the present embodiment, as shown in FIG. 2, a bottomed cylindrical instrument main body 1 having an open upper surface, a straight tubular light source 2 housed inside the instrument main body 1, and an inner surface facing the opening in the instrument main body 1. A reflecting mirror 5 that reflects the light from the light source 2 and irradiates the light through the opening, and a socket 30 to which the right end portion of the light source 2 is detachably mounted. An arm 3 that rotatably supports the main body 1 with the axis along the left-right direction of the light source 2 as a central axis, and a ballast that supports the upper end of the arm 3 and supplies lighting power to the light source 2 through the socket 30 And a case 4 housing 40.

  The instrument main body 1 includes a bottomed cylindrical main body portion 10 having an open upper surface and a substantially annular frame portion 11 attached to the front surface side of the main body portion 10, and the opening is surrounded by the frame portion 11. Light from the light source 2 is irradiated to the outside. Further, a substantially cylindrical mounting portion 10d is provided through the right side surface of the main body portion 10, and a first shaft portion 31 of an arm 3 described later is attached to the mounting portion 10d by an attachment means (not shown). The instrument body 1 is held by the arm 3 so as to be rotatable about the horizontal direction.

  The light source 2 is a so-called ceramic metal halide lamp, and as shown in FIG. 1B, is formed in a straight tube bulb 20 having a base 23 at one end and a translucent ceramic container. A pair of electrode portions are held in the discharge space, and the arc tube 21 is filled with a buffer gas (for example, mercury), a rare gas (for example, xenon), and a halide in the discharge space. In this embodiment, sodium iodide is adopted as the halide.

  The bulb 20 is made of hard glass, for example, and the inside thereof is kept in a vacuum. Note that an inert gas such as nitrogen gas may be sealed inside the valve 20. The arc tube 21 includes a discharge vessel 22 made of a translucent ceramic material for forming a discharge space therein, and a pair of electrode portions (not shown) facing each other across the discharge space inside the discharge vessel 22. ) And a pair of feeders (not shown) connected to each electrode portion and connected to each electrode portion and connected to a pair of stem wires (not shown) respectively. . The arc tube 21 is held inside the bulb 20 by connecting the power feeder to the stem wire.

  The arm 3 includes a main portion 33 formed in an inverted L shape, a first cylindrical portion 31 that is provided at a lower end portion of the main portion 33 and accommodates the socket 30, and an upper end portion of the main portion 33. And a second shaft portion 32 attached to the case 4. The second shaft portion 32 is rotatably held about the vertical direction as an axis by being attached to an attachment hole (not shown) provided in the case 4 by attachment means (not shown). An electric wire (not shown) for electrically connecting the socket 30 and the ballast 40 is wired inside each part of the arm 3.

  As shown in FIG. 2, the case 4 is formed in a substantially rectangular parallelepiped shape whose upper surface is opened, and the ballast 40 is accommodated therein, and an external power source (not shown) and the ballast 40 are electrically connected. A plug 6 for connection is provided. The plug 6 is connected to an external power source by connecting to a wiring duct (not shown) disposed on the ceiling or the like, and is connected through an opening (not shown) provided in the wiring duct. A substantially cylindrical rotator 60 inserted into the interior, a flat plate portion 61 that rotatably supports the rotator 60, and a protrusion projecting from the peripheral surface of the rotator 60 and provided inside the wiring duct. A pair of connection pieces 62 electrically connected to a conductor (not shown), a pair of locking pieces 63 projecting from the plate 61 side of the connection piece 62 on the peripheral surface of the rotating body 60, and rotation It comprises a substantially L-shaped lever 64 that protrudes from the body 60 and rotates the rotating body 60.

  As shown in FIG. 2, a pair of substantially circular insertion holes 61 a are provided in the plate portion 61, and a pair of substantially circular cross sections provided in the upper left end portion of the case 4. A substantially rectangular cover 41 that overlaps the female screw portion 40a and closes the opening of the case 4 is placed from above, and a pair of substantially circular insertion holes 41a that penetrates the left end of the cover 41 are inserted into the insertion holes 61a. And the plug 6 is attached so as to be sandwiched between the case 4 and the cover 41 by being screwed together with an assembly screw (not shown). A pair of insertion holes 41a are also provided through the right end portion of the cover 41. The insertion holes 41a are overlapped with a pair of female screw portions 40a provided at the right end portion of the case 4 and screwed with assembly screws. Thus, the cover 41 is attached to the case 4. Further, an insertion hole (not shown) provided in a substantially rectangular parallelepiped protruding portion 42 protruding from the right end portion of the case 4 and a substantially rectangular shape protruding upward at the right end portion of the cover 41. The cover 41 is securely fixed to the case 4 by overlapping the substantially circular insertion hole 41c penetrating the projecting piece 41b and screwing with the assembly screw.

  A substantially rectangular attachment piece 42a is attached to the lower side of the projecting portion 42 by an assembly screw, and the attachment piece 42a can be rotated by loosening the assembly screw using a tool such as a screwdriver. It is like that.

  Hereinafter, a method of attaching the case 4 to the wiring duct will be described. First, the rotating body 60 of the plug 6 and the protruding portion 42 of the case 4 are inserted into the wiring duct through the opening of the wiring duct. Next, the connecting piece 62 and the locking piece 63 are rotated together with the rotating body 60 by rotating the lever 64 counterclockwise until it comes into contact with the stopper 43 protruding from the left end portion of the case 4. Then, the connecting piece 62 is electrically connected to the conductor inside the wiring duct, and the plug 6 is connected to the wiring duct by the longitudinal direction of the locking piece 63 being substantially perpendicular to the longitudinal direction of the opening of the wiring duct. It is attached. Then, the mounting piece 42a can be rotated by loosening the assembly screw of the projecting portion 42 using a tool such as a screwdriver, and the longitudinal direction of the mounting piece 42a is substantially perpendicular to the longitudinal direction of the opening of the wiring duct. Then, the projecting part 42 is attached to the wiring duct by tightening the assembly screw, and the case 4 is attached to the wiring duct.

  On the inner bottom surface of the instrument body 1 facing the opening, there is provided a reflecting mirror 5 formed in a substantially paraboloidal shape with the axis passing through the center of the opening as the central axis, and the light from the light source 2 reflects the light. The light is reflected by the mirror 5 and irradiated to the outside through the opening. The light source 2 is disposed at the focal position of the reflecting mirror 5 so that the central axis in the radial direction is substantially orthogonal to the central axis of the reflecting mirror 5.

  As shown in FIG. 2, the reflecting mirror 5 is provided with a flange 51 on the outer peripheral edge on the front surface side. The flange 51 has a substantially semicircular cutout 51a extending in the circumferential direction. Are provided at equal intervals. Here, as shown in FIG. 3A, a plurality of substantially cylindrical ribs 10a (one in the drawing) project on the inner bottom surface of the main body 10 for mounting the flange 51 of the reflecting mirror 5. It is installed. On the front side of the rib 10a, a fitting projection 10b having a substantially semicircular cross section that fits into the notch 51a is projected, and a groove portion into which a fixing spring 7 to be described later is fitted is fitted into the fitting projection 10b. 10c is provided. Thus, as shown in FIGS. 3B and 3C, after the flange 51 of the reflecting mirror 5 is placed on the rib 10a of the main body 10 and the notch 51a is fitted to the fitting protrusion 10b. Then, the substantially C-shaped fixing spring 7 formed to have substantially the same dimension as the diameter of the reflecting mirror 5 is fitted into the groove portion 10c in a compressed state, and the fixing spring 7 is elastically restored, so that the reflecting mirror 5 is restored. It is clamped between the fixing spring 7 and the rib 10a.

  Hereinafter, the reflecting mirror 5 which is the gist of the present embodiment will be described. As shown in FIG. 1A, the reflecting mirror 5 of the present embodiment is provided with a light distribution section 50 over the entire surface thereof. The light distribution unit 50 is divided into a large number in the radial direction and the circumferential direction with the central axis of the reflecting mirror 5 as the center, and each division element is formed in a curved surface protruding to the front side. Therefore, in the light distribution unit 50, the curved convex portions of the respective divided elements are continuously arranged concentrically and radially, and the concave portions formed between the respective divided elements are continuously arranged concentrically and radially. It has a fine uneven shape. In addition, the side along the circumferential direction in each division | segmentation element is not circular arc shape but linear form.

  Here, when the reflection path of light from the light source 2 when the conventional reflecting mirror 5 is used, incident light passing through the central portion of the arc tube 21 is reflected in the horizontal direction as shown in FIG. On the other hand, incident light that passes directly under the arc tube 21, that is, through the lower end of the light source 2, is reflected upward from the horizontal direction. For example, when the angle formed by the incident light passing through the central portion of the arc tube 21 and the incident light passing through the lower end of the light source 2 (hereinafter referred to as “incident angle”) is 4.4 degrees, the reflection angle is in the horizontal direction. When the incident angle is 8.2 degrees, the reflection angle is 8.2 degrees upward from the horizontal direction. Therefore, as shown in FIG. 5B, the yellowish light irradiated through the iodide precipitated on the lower bottom surface of the arc tube 2 is concentrated on the upper portion of the irradiated surface A (in the figure). As a whole, color unevenness occurs.

  On the other hand, when the reflecting mirror 5 of the present embodiment is used, the light incident on the reflecting mirror 5 is diffused and reflected by the light distribution unit 50, and as shown in FIG. When the incident angle is 4.4 degrees, the reflection angle is 50 degrees, which is spread evenly up and down with respect to the horizontal direction, and when the incident angle is 8.2 degrees, the reflection angle is in the horizontal direction. On the other hand, it is 61 degrees which spreads almost vertically. Therefore, as shown in FIG. 5 (a), the yellowish light irradiated through the iodide precipitated on the bottom surface of the arc tube 2 is evenly irradiated on the entire irradiated surface A (same as above). (See the white part in the figure).

  As described above, by providing the fine uneven light distribution portion 50 over the entire surface of the reflecting mirror 5 that reflects the light from the light source 2, irradiation is performed through iodide precipitated on the lower bottom surface of the arc tube 2. Since the yellowish light to be reflected is reflected uniformly in any of the upper, lower, left and right directions in the light distribution section 50, the reflected light is evenly applied to the irradiated surface A, and therefore the irradiated surface regardless of the irradiation direction. It is possible to obtain a uniform illumination effect that does not cause color unevenness in A.

It is a figure which shows embodiment of the lighting fixture of this invention, (a) is a front view, (b) is sectional drawing abbreviate | omitted partially seen from the upper side, (c) is a fragmentary sectional view seen from the right side. is there. It is a disassembled perspective view which abbreviate | omitted the light source same as the above. It is explanatory drawing of the attachment method of a reflective mirror same as the above, (a) is a figure which shows an instrument main body, (b) is a figure which shows the state which mounted the reflective mirror in the instrument main body, (c) is fixing a reflective mirror. It is a figure which shows the state attached with the spring. It is explanatory drawing which shows reflection of the light in a reflective mirror same as the above, (a) is schematic which shows reflection of light in the reflective mirror of this invention, (b) is schematic which shows reflection of light in the reflective mirror of a prior art example. It is. It is a figure which shows the irradiation pattern in the to-be-irradiated surface same as the above, (a) is a figure which shows the irradiation pattern in this invention, (b) is a figure which shows the irradiation pattern in a prior art example. It is a whole perspective view which shows the conventional lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument main body 2 Light source 21 Light emission tube 23 Base 3 Arm 30 Socket 31 1st axial part 32 2nd axial part 4 Case 40 Ballast 5 Reflector 50 Light distribution part

Claims (1)

An instrument body consisting of a box with an opening on one side, a long light source housed inside the instrument body, an inner surface facing the opening in the instrument body, and reflecting light from the light source through the opening A substantially rotating parabolic reflector that irradiates the exterior, a socket in which a base provided at one end of the light source is detachably mounted, and a socket is housed in one end and the instrument body in the longitudinal direction of the light source A lighting fixture comprising: an arm that is rotatably supported around an axis along the axis; and a case that houses a ballast that supports the other end of the arm and supplies lighting power to the light source via a socket, The light source includes a light-emitting tube in which a pair of electrode portions are held in a discharge space formed inside a light-transmitting container and a rare gas and a halide are sealed in the discharge space, and the focal point of the reflecting mirror Place The illuminating device is characterized in that the central axis in the radial direction is arranged so as to be substantially perpendicular to the central axis of the reflecting mirror, and the reflecting mirror is provided with a fine uneven light distribution portion over the entire surface thereof. .

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