JP2010055772A - Light dimmer for downlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light dimmer for a downlight capable of adjusting a light volume over a wide range while being manufactured at low cost, and easily post-mounted to an existing downlight. <P>SOLUTION: The light dimmer is provided with a frame body 81 which can be mounted in free detachment at a lower opening edge for light irradiation of the downlight 1, and an iris shutter 82 varying its opening area is arranged at the frame body 81 coaxially with a light axis. The iris shutter 82 is so set that an opening area at the most closed state is nearly the same as a cross-section area crossing the light axis of a cap 53 of a glare-proof member 5 arranged in opposition to a light source of the downlight 1 so as to shield light from the light source. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a downlight dimmer for adjusting the amount of light emitted from a downlight.

  Some conventional downlights have a light irradiating direction variable by attaching a frame with a louver shutter to the lower opening edge of the downlight for light emission. However, such a louver shutter can only change the irradiation direction of light and cannot arbitrarily adjust the light amount. For this reason, it is difficult to fully exhibit the light effect according to the life scene.

Therefore, in the prior art, a configuration in which an iris shutter is provided at the lower opening edge for light emission of the downlight has been proposed (for example, see Patent Document 1 below).
No. 7-43849

  In the device described in Patent Document 1, the amount of light can be adjusted by opening and closing the iris shutter. In particular, when the iris shutter is most closed, the opening area is substantially zero. There is a feature that can completely block light.

  However, the iris shutter that can make the opening area substantially zero when fully closed in this way is more complex and expensive than a commonly known iris shutter, and it can be easily used for existing downlights. It is also difficult to install.

  The present invention has been made to solve the above-described problems, and can arbitrarily adjust the light amount over a wide range from a state where light can be sufficiently emitted to a state where light is almost completely blocked, and is inexpensive. It is an object of the present invention to provide a downlight dimmer that can be manufactured easily and can be easily retrofitted to an existing downlight.

  In order to achieve the above object, a downlight dimmer according to the first aspect of the present invention includes a frame that is detachably attached to a lower opening edge for light emission of the downlight, The iris shutter that varies the aperture area is provided concentrically with the optical axis, and the iris shutter has a glare disposed so as to be opposed to the light source so that the aperture area when the shutter is most closed blocks direct light from the light source of the downlight. It is characterized by being set to be substantially the same as the cross-sectional area across the optical axis of the cap of the prevention member.

  The downlight dimmer according to the invention described in claim 2 is characterized in that, in the configuration of the invention described in claim 1, the flap constituting the iris shutter is made of a light transmitting member.

  In the downlight dimmer according to the first aspect of the present invention, the frame having the iris shutter can be detachably attached to the lower opening edge for light emission of the downlight. Can be easily retrofitted. Further, since the iris shutter in this case has a general configuration, it can be manufactured at low cost. The iris shutter having such a general configuration cannot make the aperture area zero even when the iris shutter is in the most closed state. However, in the present invention, the aperture area when the iris is most closed is arranged with respect to the light source of the downlight. The amount of light that leaks to the outside due to the light passing through the iris shutter opening being blocked by the cap portion of the anti-glare member because the cross-sectional area across the optical axis of the cap of the anti-glare member is set. Is extremely low. Therefore, the amount of light can be adjusted over a wide range from the state where the light is blocked by the cap part of the anti-glare member and the amount of light emitted from the iris shutter opening is extremely small to the state where the iris shutter opening is opened and the light can be emitted sufficiently. can do.

  Further, in the downlight dimmer according to the second aspect of the invention, since the flap constituting the iris shutter is made of a light transmitting member, the color of light can be changed depending on the material, and the degree of freedom of design is high. Therefore, the light effect can be further enhanced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partially broken front view showing a state in which a downlight dimmer according to an embodiment of the present invention is attached to the downlight, and FIG. 2 is an exploded perspective view showing the downlight dimmer and the downlight. It is. Here, the configuration of the downlight will be described first, and then the configuration of the downlight dimmer of the present invention will be described.

  The downlight 1 includes a lamp body 2, a reflection plate 3, a light source 4, and a glare prevention member 5. The lamp body 2 includes an inner packet part 21 formed in a substantially bullet shape so as to enclose the reflector 3 and the glare prevention member 5, and a cylindrical part 22 formed at the lower part of the inner packet part 21. The inner packet part 21 is arranged on the back side of the ceiling board P, and the cylindrical part 22 is arranged so as to be exposed on the front side of the ceiling board P. And the socket 6 is attached to the top part of the inner packet part 21, and while connecting the upper end part of the light sources 4, such as an incandescent lamp, to the socket 6, the lead wire 7 is connected.

  Further, on the inner peripheral surface of the cylindrical portion 22 of the lamp body 2, a locking projection 24 is formed to lock notches 33 and 54 (described later) of the reflecting plate 3 and the glare preventing member 5. 3 and a spring member 25 for pressing and holding the glare prevention member 5 are provided. Further, an L-shaped fitting groove 26 for positioning and fixing a frame body 81 of a downlight dimmer 8 to be described later is formed on a part of the outer periphery of the cylindrical portion 22, and a frame body fixing knob is formed. A screw 27 is provided.

  The reflecting plate 3 is formed in a bullet shape having a substantially paraboloidal surface with respect to the optical axis and has a reflecting surface formed therein, and a radial direction from the periphery of the lower opening of the reflecting mirror portion 31. It has a flange portion 32 projecting outward, and a notch 33 is formed at an appropriate location of the flange portion 32. An insertion hole 34 for the light source 4 is formed at the top of the reflector 3.

  The glare prevention member 5 includes a ring-shaped frame 51 having substantially the same size as the flange portion 32 of the reflector 3, an arch-shaped bar 52 having both ends connected to the frame 51, and a light source held by the bar 52. 4, and a cap 53 that shields the direct light from the light source 4 so as to cover the lower end portion of the light source 4, and these are integrally coupled. The frame 51 is formed with a notch 54 at a location that matches the notch 33 of the reflector 3.

  In order to attach the reflector 3 and the glare prevention member 5 to the lamp body 2, the collar portion 32 of the reflector 3 and the glare prevention are performed with the collar portion 32 of the reflector 3 and the frame 51 of the glare prevention member 5 overlapped. Both the notches 33 and 54 provided on the frame 51 of the member 5 are both inserted into the locking projections 24 of the lamp body 2 and then rotated in the circumferential direction to cooperate with the spring member 25. Both the reflector 3 and the glare prevention member 5 are integrally held by the lamp body 2.

  On the other hand, the downlight dimmer 8 includes a substantially cylindrical frame 81 that is detachably attached to the cylindrical portion 22 of the lamp body 2 serving as a lower opening edge for light emission of the downlight. Inside, an iris shutter 82 whose opening area is variable is provided concentrically with the optical axis.

  The frame 81 has an inner diameter that is fitted onto the cylindrical portion 22 of the lamp body 2, and an iris shutter 82 is provided therein. Further, a part of the upper end of the frame body 81 is engaged with the substantially L-shaped cut groove 83 into which the frame body fixing thumbscrew 27 of the lamp body 2 is inserted and the fitting groove 26 of the lamp body 2. A protrusion (not shown) is formed. Further, a slit 85 for shutter operation is formed in a part of the frame 81 along the circumferential direction, and a shutter opening / closing thumb screw 86 projects outward from the slit 85.

  In the iris shutter 82, a ring-shaped operation plate 87 is disposed inside the frame 81, and a large number of substantially linear elongated holes (not shown) are radially formed in the operation plate 87. A wing-shaped flap 88 is slidably attached. In this case, the flap 88 is made of, for example, a synthetic resin that is not light transmissive and colored, for example, black. The shutter opening / closing thumbscrew 86 is fixed at one place on the peripheral side of the operating plate 87. The configuration of the iris shutter 82 is well known.

  In order to fix the downlight dimmer 8 to the lamp body 2 of the downlight 1, the neck portion of the frame fixing thumbscrew 27 is inserted into the cut groove 83 of the frame 81, and the frame 81 is illustrated. The protrusion not to be inserted is inserted into the fitting groove 26. Then, after the frame body 81 is rotated so that the neck portion of the frame body fixing thumbscrew 27 is positioned at the inner end portion of the cut groove 83, and the projection (not shown) is positioned at the inner end portion of the fitting groove 26. Then, the frame fixing thumbscrew 27 is tightened.

  As described above, in this embodiment, the downlight dimmer 8 can be detachably attached to the lower opening edge of the light emission side of the downlight 1, so that it can be easily retrofitted to the existing downlight 1. It is possible. Further, the iris shutter 82 included in the downlight dimmer 8 in this case has a general configuration and can be manufactured at low cost.

  Here, after the downlight dimmer 8 is attached to the downlight 1, when the shutter opening / closing thumbscrew 86 is rotated along the slit 85, the operation plate 87 is rotated in response to the rotation of the operation plate 87. The opening area of the iris shutter 82 is varied as the flaps 88 are gathered or separated at the same distance from the center of the optical axis with the rotation.

  In this case, since the iris shutter 82 is thick in the flap 88, even when the iris shutter 82 is in the most closed state, the opening area cannot be made zero as shown in FIG. However, in this embodiment, since the opening area when the iris shutter 82 is most closed is set to be substantially the same as the cross-sectional area across the optical axis of the cap 53 of the anti-glare member 5, anti-glare is prevented. The light passing through the opening of the iris shutter 82 is blocked by the cap 53 of the member 5, and the amount of light leaking to the outside is extremely reduced.

  Therefore, from the state where the light is blocked by the cap 53 of the anti-glare member 5 as shown in FIG. 3A and the amount of light emitted from the opening of the iris shutter 82 is extremely small, the iris shutter as shown in FIG. The amount of light can be adjusted over a wide range from the opening of 82 to the state where light can be sufficiently emitted.

  In the above description, the flap 88 configuring the iris shutter 82 is configured to have no light transmittance, but may be configured to be a light transmitting material such as a transparent resin. In this way, if the flap 88 of the iris shutter 82 is made of a light transmissive material, the color of light can be changed depending on the material, and the degree of freedom of design is increased, so that the light effect can be further enhanced. Can do.

It is a partially broken front view which shows the state which attached the dimmer for downlights in embodiment of this invention to the downlight. It is a disassembled perspective view which shows the light controller for downlights and a downlight in embodiment of this invention. It is the top view seen from the light emission side in order to demonstrate the effect | action of the iris shutter of the dimmer for downlights.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Downlight 4 Light source 5 Glare prevention member 53 Cap 8 Downlight dimmer 81 Frame 82 Iris shutter 88 Flap

Claims (2)

  A frame body that is detachably attached to the lower opening edge for light emission of the downlight is provided, and an iris shutter that varies the opening area is provided concentrically with the optical axis in the frame body, and this iris shutter is the most closed The opening area at the time is set so as to be substantially the same as the cross-sectional area across the optical axis of the cap of the glare prevention member arranged to face the light source so as to block the direct light from the light source of the downlight Dimmer for downlight.   2. The downlight dimmer according to claim 1, wherein the flap constituting the iris shutter is made of a light transmitting member.

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