JP2007018877A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of making light output low as a whole at the time of low luminance lighting while preventing its outward appearance from being deteriorated at the time of low luminance lighting. <P>SOLUTION: This luminaire is equipped with first and second discharge lamps each having ring shapes and mutually different diameters, a luminaire body which independently holds each of the discharge lamps with their center axes brought in line, and a cover covering each discharge lamp by being combined with each discharge lamp to diffuse light from each discharge lamp. At the time of low luminance lighting when the ratio (dimming ratio) of power supplied to each discharge lamp to rated power becomes small, the dimming ratio DR1 of the first discharge lamp having the smaller diameter is made smaller than the dimming ratio DR2 of the second discharge lamp having the larger diameter. While preventing the outward appearance from being deteriorated by securing light output at the time of low luminance lighting of the first discharge lamp, light output at the time of low luminance lighting can be made lower as a whole compared with the case in which the dimming ratios DR1, DR2 are common between the discharge lamps. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting fixture.

2. Description of the Related Art Conventionally, there has been provided a lighting fixture that includes a plurality of discharge lamps each having an annular shape and aligned with an axis and capable of dimming each discharge lamp (see, for example, Patent Document 1).
An example of this type of lighting apparatus is shown in FIG. The lighting fixture includes two discharge lamps La1 and La2 each having a ring shape and different diameters, and a first lighting circuit 11 that supplies power to the first discharge lamp La1 having a smaller diameter to light the lamp. The second lighting circuit 12 for supplying power to the second discharge lamp La2 having a larger diameter and lighting it, and the control circuit 2 for controlling the lighting circuits 11 and 12 respectively. Each of the discharge lamps La1 and La2 has, for example, a slim annular double shape (so-called FHD type). The rated power of the first discharge lamp La1 is 41 W, for example, and the rated power of the second discharge lamp La2 is 97 W, for example. It is. The second lighting circuit 12 is connected to the AC power supply AC through the power line P2, and the first lighting circuit 11 is supplied with power from the second lighting circuit 12 through the power line P1. The control circuit 2 is connected to the second lighting circuit 12 via the five electric wires S <b> 2 and is supplied with power from the second lighting circuit 12. Further, the first lighting circuit 11 is connected to the second lighting circuit 12 via the three signal lines S <b> 1 and is connected to the control circuit 2 via the second lighting circuit 12. One of the electric wires S2 supplies 100V power to the control circuit 2, and one inputs a signal indicating whether or not the AC power supply AC is connected to the control circuit 2. Further, the remaining three of the electric wires S2 and the signal line S1 are electric wires for input / output of control signals generated by the control circuit 2 and instructing switching on / off of the discharge lamps La1 and La2. It includes an electric wire for input / output of a dimming signal generated by the circuit 2 and instructing the light output of the discharge lamps La1 and La2, and an electric wire connected to the ground. Note that the first lighting circuit 11 may be directly connected to the control circuit 2 without going through the second lighting circuit 12 as shown in FIG.

  Each of the first lighting circuit 11 and the second lighting circuit 12 includes, for example, a known inverter circuit, and the control circuit 2 supplies the discharge lamps La1 and La2 by changing the output frequency of each of the lighting circuits 11 and 12. Change the electric power. As a result, the discharge lamps La1 and La2 are turned on at any one of the 20 dimming stages having different light outputs, as shown in FIG. Hereinafter, the dimming step with the highest light output is referred to as high luminance lighting, and the dimming step with the smallest light output is referred to as low luminance lighting. That is, each of the intermediate 18 dimming steps is medium-intensity lighting in the claims.

  Further, as shown in FIG. 9, the conventional lighting fixture is mounted on the ceiling CE and holds the discharge lamps La1 and La2 with the center axes thereof aligned (that is, arranged concentrically when viewed from below). The fixture body 3 holding the control circuit 2 and the lighting circuits 11 and 12 respectively, and the fixture body 3 made of a material having diffuse permeability, covering the discharge lamps La1 and La2, and covering the discharge lamps La1 and La2. And a cover 4 to be diffused. In the example of FIG. 9, the fixture body 3 is held on the ceiling CE, and the electrical connection between the electric wire P2 disposed in the ceiling CE and connected to the AC power source AC and the second lighting circuit 12 is the hooking ceiling 6. The cushioning material 7 is disposed between the instrument body 3 and the ceiling CE. In addition, the appliance body 3 has a socket 32 to which the caps of the discharge lamps La1 and La2 are attached, and a holder 33 that holds the discharge lamps La1 and La2 by elastically holding the discharge lamps La1 and La2 made of a leaf spring. And a frustoconical reflector 5 for distributing the light from the discharge lamps La1 and La2.

  Furthermore, the instrument body 3 has, for example, a disk shape as shown in FIG. 10, and a plurality of (only two shown) engaging portions 31 for holding the cover 4 are provided near the outer periphery of the lower surface in the figure. They are arranged in the circumferential direction at equal intervals (for example, every 120 degrees). The engaging portion 31 is formed in an L-shaped cross section with a tip portion protruding outward in the radial direction of the instrument body 3. The cover 4 has a hollow cylindrical shape with one bottom surface (upper surface in FIG. 9) opened in a circular shape, and a plurality (six in the figure) that engage with the engaging portions 31 on the inner periphery of the opening. The engaging projections 41 are arranged inward in the circumferential direction at regular intervals. In order to attach the cover 4 to the instrument body 3, the engagement portion 31 is introduced into the cover 4 through the engagement protrusions 41 as indicated by an arrow A 1 in FIG. Rotate clockwise as seen from below. Then, the engagement protrusion 41 engages with the engagement portion 31, whereby the cover 4 is coupled to the instrument body 3. On the other hand, when removing the cover 4, the cover 4 is rotated counterclockwise with respect to the instrument body 3 as viewed from below, and the engaging portion 31 is led out from the cover 4 through the engagement protrusions 41. That is, the cover 4 is detachably attached to the instrument body 3 by a so-called soft turn method. In addition, an annular protrusion 42 that divides a range that mainly receives the light of the first discharge lamp La1 and a range that mainly receives the light of the second discharge lamp La2 is formed on the surface of the cover 4 that faces the instrument body 3. It is protruding.

Further, the control circuit 2 is provided with a receiving unit (not shown) made of, for example, a photodiode in order to receive a wireless signal transmitted from a remote control device (not shown) using, for example, infrared light as a medium. Yes. The wireless signal instructs the discharge lamps La1 and La2 to be turned on / off and change the dimming stage. The control circuit 2 controls each of the lighting circuits 11 and 12 according to the wireless signal received by the receiving unit. Further, the instrument body 3 is provided with a receiving block 34 that holds the receiving portion of the control circuit 2 facing downward.
JP 2000-188196 A

  By the way, if the dimming ratio is reduced to some extent, even if the light from the first discharge lamp La1 located inside is diffused by the cover 4, the center portion of the cover 4 cannot be sufficiently emitted when viewed from below. Therefore, it looks bad. In order to prevent such a deterioration in appearance, it is necessary to ensure the light output of the first discharge lamp La1.

  Conventionally, in all dimming stages, the ratio of the supplied power to the rated power (hereinafter referred to as “dimming ratio”) is the first discharge lamp La1 and the second discharge lamp La2. It was controlled to be common.

  Therefore, if the dimming ratio of the first discharge lamp La1 at the time of low-intensity lighting is ensured in order to prevent the deterioration of the appearance as described above, the dimming ratio of the second discharge lamp La2 is also increased. The overall light output at the time of luminance lighting could not be lowered.

  The present invention has been made in view of the above-mentioned reasons, and the object thereof is a lighting apparatus capable of reducing the overall light output during low-luminance lighting while preventing deterioration in appearance during low-luminance lighting. Is to provide.

  According to a first aspect of the present invention, there are provided first and second discharge lamps each having an annular shape and having different diameters, and each discharge lamp is supplied with electric power so that each discharge lamp is turned on at least with high brightness and with high brightness. The lighting means that can be turned on with low-intensity lighting with a lower light output by reducing the power supplied to each discharge lamp, the control means that controls the lighting means, and the discharge lamps with the central axis of each other An instrument main body that holds the lighting means and the control means while holding them together, and a cover that is made of a light-transmitting material and is coupled to the instrument main body to cover each discharge lamp and diffuse the light of each discharge lamp, The control means sets the ratio of the power supplied during low-luminance lighting for the first discharge lamp with a smaller diameter to the rated power of the power supplied during low-luminance lighting for the second discharge lamp with a larger diameter. Greater than the ratio to Characterized in that it.

  According to the present invention, even if the light output of the first discharge lamp at the time of low-intensity lighting is ensured to prevent deterioration in appearance at the time of low-intensity lighting, the ratio of the power supplied at the time of low-intensity lighting to the rated power Since the light output of the second discharge lamp can be lowered during low-intensity lighting, the overall light output during low-intensity lighting can be reduced as compared with the case where the same is used for each discharge lamp.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the lighting means supplies each discharge lamp with power of 100% ± 10% of the rated power at the time of high brightness lighting.

  The invention of claim 3 is the invention according to claim 1 or claim 2, wherein the first light distribution section is held by the instrument body and covered by the cover, and distributes the light of the first discharge lamp in the axial direction. And a reflection plate having a second light distribution unit that distributes light of the second discharge lamp radially outward.

  According to the present invention, it is possible to illuminate a wide area with the second discharge lamp at the time of high-intensity lighting, and concentrate and illuminate a narrow area with the first discharge lamp at the time of low-intensity lighting.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the lighting means is configured such that the light output of each discharge lamp is smaller between the high luminance lighting and the low luminance lighting than in the high luminance lighting. At least one level of medium-intensity lighting is possible, which is larger than that at the time of low-intensity lighting. At the time of medium-intensity lighting, the ratio of the light output of the first discharge lamp to the light output of the second discharge lamp Within a range smaller than the time, the smaller the light output of the second discharge lamp is, the larger is the feature.

  According to the present invention, compared to the case where the ratio of the light output of the first discharge lamp to the light output of the second discharge lamp is changed abruptly, the medium brightness lighting between the low brightness lighting and the high brightness lighting is performed. It is difficult for viewers to feel uncomfortable when switching.

  According to the present invention, the ratio of the light output during low-intensity lighting with respect to the rated power is set to be larger in the first discharge lamp than in the second discharge lamp. Even if the output is secured, the light output as a whole at the time of low-intensity lighting can be lowered as compared with the case where the above ratio is made common to the respective discharge lamps.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals, and illustration and description thereof are omitted.

  As shown in FIG. 1, the control circuit 2 of the present embodiment supplies 100% of the rated power from the lighting circuits 11 and 12 to each of the discharge lamps La1 and La2 at the time of high-intensity lighting. , La2 dimming ratios DR1 and DR2 are each 100%. Further, the dimming ratio DR1 of the first discharge lamp La1 is set higher than the dimming ratio DR2 of the second discharge lamp La2 except during high-intensity lighting, and the first discharge lamp La1 is set during low-intensity lighting. The light control ratio DR1 of the second discharge lamp La1 is set to 10% while the light control ratio DR1 of the second discharge lamp La1 is set to 25%.

  Further, in the 20 dimming stages including high-intensity lighting and low-intensity lighting and different supply powers to the discharge lamps La1 and La2, respectively, the dimming stage in which the dimming ratio DR2 of the second discharge lamp La2 is lower. The ratio of the dimming ratio DR1 of the first discharge lamp La1 to the dimming ratio DR2 of the second discharge lamp La2 is increased. As a result, the relationship between the light output of the first discharge lamp La1 and the light output of the second discharge lamp La2 changes continuously according to the dimming stage, and therefore the dimming ratio DR1 of the first discharge lamp La1. And the dimming ratio DR2 of the second discharge lamp La2 are less likely to cause an uncomfortable appearance than when the ratio is rapidly changed.

  Since the dimming ratios DR1 and DR2 of the discharge lamps La1 and La2 are set as described above, in the present embodiment, the light output LM1 of the first discharge lamp La1, the light output LM2 of the second discharge lamp La2, and the whole The optical output LMT as is as shown in FIG.

  The dimming signal input from the control circuit 2 to each of the lighting circuits 11 and 12 to instruct the power supplied to the discharge lamps La1 and La2 is, for example, a frequency of about 1 kHz and a voltage amplitude of about 5. Each of the lighting circuits 11 and 12 is a 0 V pulse signal, and each has a conversion unit that converts, for example, the duty ratio of the dimming signal into a voltage. For example, as shown in FIG. 3, the conversion unit includes a series circuit of resistors R1 to R3 having one end held at a constant voltage Vref and the other end grounded, and a capacitor C1 connected between both ends of the low-voltage side resistor R3. A resistor R4 connected in parallel to the two resistors R2 and R3 on the low voltage side and a series circuit of the transistor Q1 are provided. A pulse signal is input to the base of the transistor Q1, and a voltage corresponding to the duty ratio of the pulse signal is output from the capacitor C1. The relationship between the dimming stage and the voltage V1 output from the conversion unit in the first lighting circuit 11 and the voltage V2 output from the conversion unit in the second lighting circuit 12 is, for example, as shown in the following table and FIG. Become.

  Each of the lighting circuits 11 and 12 includes, for example, a power factor improving unit (not shown) that is composed of a boost chopper circuit and converts power supplied from the AC power source AC into DC power of a predetermined voltage, and a half-bridge type. An inverter circuit (not shown) that converts the output of the power factor improvement unit into AC power, and an inverter unit that includes a known driving IC and has a constant frequency according to the output voltage of the conversion unit. And a drive unit (not shown) for driving the switching element of the inverter unit. Further, in order to suppress mutual interference between the control circuit 2 and the lighting circuits 11 and 12, each of the lighting circuits 11 and 12 receives a control signal and a dimming signal output from the control circuit 2 as a photocoupler (not shown). )

  According to the above configuration, the low-intensity lighting of the first discharge lamp La1 is achieved by making the dimming ratio of the first discharge lamp La1 larger than the dimming ratio of the second discharge lamp La2 during low-intensity lighting. Even if the light output at the time is secured, the overall light output at the time of low-intensity lighting is lower than in the case where the dimming ratio at the time of low-intensity lighting is common to the discharge lamps La1 and La2 as in the conventional example. can do. For example, as shown in FIG. 8, in the conventional example, the overall light output LMT can be reduced only to about 3000 lm at the time of low luminance lighting, whereas in the present embodiment, at the time of low luminance lighting as shown in FIG. While securing the light output LM1 of the first discharge lamp La1 to the same level as the conventional example, the overall light output LMT is lowered to about 2000 lm.

  In the present embodiment, as already described, the dimming ratio at the time of low-intensity lighting is 25% for the first discharge lamp La1 and 10% for the second discharge lamp La2, but The dimming ratio of the discharge lamps La1 and La2 is not limited to the above value. For example, the dimming ratio during low-intensity lighting may be 28% for the first discharge lamp La1 and 14% for the second discharge lamp La2. . Here, in determining the dimming ratio at the time of low-luminance lighting, for example, the second discharge lamp La2 is set to the minimum dimming ratio within a range where it can be stably lit under a normal use environment. The first discharge lamp La1 has a dimming ratio that does not deteriorate the appearance during low-luminance lighting. In addition, at the time of low-luminance lighting, the dimming ratio of the first discharge lamp La1 is desirably 1.5 times or more than the dimming ratio of the second discharge lamp La2.

  Further, as shown in FIG. 5, the concave first light distribution unit 51 that distributes the light of the first discharge lamp La1 in the axial direction (downward in FIG. 5), and the first light distribution unit 51 The outer peripheral surface is inclined in the direction of decreasing the outer diameter as the outer peripheral surface is closer to the lower end, and the lower end is surrounded by the second discharge lamp La2, and the light from the second discharge lamp La2 is emitted to the second discharge. You may provide the reflector 5 which has the frustoconical-shaped 2nd light distribution part 52 which distributes light outward in the radial direction (left-right direction of FIG. 5) of electric lamp La2. By adopting this configuration, it is possible to illuminate a wide area by the second discharge lamp La2 and the second light distribution unit 52 during high-intensity lighting. Further, at the time of low-luminance lighting, the first discharge lamp La1 and the first light distribution unit 51 illuminate in a concentrated manner in the axial direction of the discharge lamps La1 and La2, that is, a narrow range directly below the lighting fixture, thereby Power consumption can be reduced while ensuring the illuminance directly below.

  Further, the number of dimming steps is not limited to 20 as in the present embodiment, and the light output can be continuously changed between, for example, infinite number of dimming steps, that is, between high luminance lighting and low luminance lighting. You may be able to do it. Furthermore, a plurality of one or both of the first discharge lamp La1 and the second discharge lamp La2 may be provided.

It is explanatory drawing which shows the relationship between the light control stage and light control ratio of each discharge lamp in embodiment of this invention. It is explanatory drawing which shows the relationship between a light control stage and light output in the same as the above. It is a circuit diagram which shows the circuit which converts a pulse signal into a voltage in the lighting circuit same as the above. It is explanatory drawing which shows the relationship between a light control stage and the output voltage of the circuit of FIG. It is sectional drawing which shows another example same as the above. It is a block diagram which shows an example of a structure of a lighting fixture. It is a block diagram which shows another example of a structure of a lighting fixture. It is explanatory drawing which shows the relationship between a light control stage and light output in the conventional lighting fixture. It is sectional drawing which shows an example of a lighting fixture. It is explanatory drawing which shows the example of how to attach the cover to an instrument main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Control circuit 3 Appliance main body 4 Cover 5 Reflector 11 1st lighting circuit 12 2nd lighting circuit 51 1st light distribution part 52 2nd light distribution part La1 1st discharge lamp La2 2nd discharge lamp

Claims (4)

The first and second discharge lamps, each having an annular shape and having a different diameter, and power are supplied to each discharge lamp to supply each discharge lamp to each discharge lamp at least with high-intensity lighting and high-intensity lighting. Lighting means that can be turned on with low-intensity lighting with reduced light output by reducing the power to be output, control means for controlling the lighting means, and lighting means that hold each discharge lamp in alignment with each other's central axes And an instrument body holding the control means, and a cover made of a light-transmitting material, coupled to the instrument body, covering each discharge lamp and diffusing the light of each discharge lamp,
The control means sets the ratio of the power supplied during low-luminance lighting for the first discharge lamp with a smaller diameter to the rated power of the power supplied during low-luminance lighting for the second discharge lamp with a larger diameter. A luminaire characterized by having a ratio larger than the ratio.   The lighting device according to claim 1, wherein the lighting means supplies power of 100% ± 10% of the rated power to each discharge lamp at the time of lighting with high brightness.   A first light distribution unit that is held by the instrument body and covered with a cover, and distributes the light from the first discharge lamp in the axial direction; and the second light distribution that distributes the light from the second discharge lamp outward in the radial direction. The lighting apparatus according to claim 1, further comprising a reflector having two light distribution units.   The lighting means is capable of at least one level of medium-intensity lighting between the high-intensity lighting and the low-intensity lighting so that the light output of each discharge lamp is smaller than that during high-intensity lighting and larger than that during low-intensity lighting. Thus, the lower the light output of the second discharge lamp is, the lower the ratio of the light output of the first discharge lamp to the light output of the second discharge lamp is in the range smaller than that during low-intensity lighting. The lighting fixture according to claim 1, wherein the lighting fixture is enlarged.

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