JP2006134791A - Lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus capable of improving the optical output and of being made thin. <P>SOLUTION: The lighting apparatus 1 is provided with a lamp-housing section 2 having a cover 2b and tightly enclosed, a lighting circuit housing section 3 which is arranged adjacent to the lamp-housing section 2, a cold cathode fluorescent lamp 4 which has a plurality of straight tube parts 4a, arranged respectively so that the spacing of each other is 30 mm or smaller and is housed in the lamp-housing section 2, and a lighting circuit 6 which is housed in the lighting circuit housing section 3 and makes the cold cathode fluorescent lamp 4 lit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lighting apparatus including a cold cathode fluorescent lamp.

  At present, the use of a cold cathode fluorescent lamp is attracting attention as a light source of a lighting fixture installed in a house or the like (see, for example, Patent Documents 1 and 2). The tube diameter of the cold cathode fluorescent lamp is much thinner than a general fluorescent lamp (referred to as a hot cathode fluorescent lamp) and is often less than 5 mm. For example, the tube diameter is very thin such that the thickness is less than 50 mm. A lighting fixture can be obtained. Therefore, when such a lighting fixture is used attached to a ceiling surface or the like, there is an advantage that the feeling of pressure can be greatly reduced.

Furthermore, a technique is disclosed in which a cold cathode fluorescent lamp is used as a light source of a lighting fixture and a lighting circuit is arranged in the longitudinal direction of the cold cathode fluorescent lamp (see, for example, Patent Document 3). According to such a lighting fixture, the lighting fixture can be made thinner by the thickness of the lighting circuit, and thus the lighting fixture can be made thinner.
JP 2001-14904 A JP 2003-297141 A JP 2004-149303 A

  Incidentally, it is known that the light output of the fluorescent lamp greatly depends on the temperature of the coldest part. In the case of a general hot cathode fluorescent lamp, the light output is maximized when the temperature of the coldest part is about 40 to 50 ° C., but in the case of a cold cathode fluorescent lamp having a tube diameter of 10 mm or less, mercury is used. The higher the vapor pressure, the higher the ultraviolet output because the probability that ultraviolet rays will be reabsorbed by the vapor pressure will decrease. Generally, the light output is maximized when the temperature of the coldest part is 60 to 65 ° C. When it is about.

  However, when the cold cathode fluorescent lamp is turned on, the coldest part becomes lower than the optimum temperature as described above, and it is difficult to obtain the maximum light output. The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a lighting apparatus that can improve the light output and is thinned.

  The invention described in claim 1 includes a light-transmitting portion and a sealed lamp housing portion; a lighting circuit housing portion disposed adjacent to the lamp housing portion; and a distance between each other is 30 mm or less. A cold cathode fluorescent lamp having a plurality of arc tube portions arranged and housed in the lamp housing portion; and a lighting circuit housed in the lighting circuit housing portion for lighting the cold cathode fluorescent lamp. It is the lighting fixture characterized by.

  The “sealed lamp housing part” means that the inside of the housing part is covered to such an extent that heat can be kept, and includes a structure in which a slight gap is formed. The lighting circuit housing portion is disposed adjacent to the lamp housing portion. However, as a case where the lighting circuit housing portion is disposed adjacent to the lamp housing portion, the lighting circuit housing portion is disposed, for example, on the longitudinal side of the lamp housing portion. And the case where it is arranged on the width direction side of the lamp housing portion.

  The tube diameter of the cold cathode fluorescent lamp is 1 to 10 mm, optimally 3 to 5 mm. This is because the cold cathode fluorescent lamp having this tube diameter has a remarkable effect of improving the lamp efficiency when the interval between the arc tube portions is set to 30 mm or less. In addition, although the minimum of a space | interval is not prescribed | regulated in particular, it is preferable to set 5 mm as a minimum, considering the lamp | ramp mounting work and the optimization of the brightness | luminance of a translucent part.

  According to invention of Claim 1, since the space | interval between arc_tube | light_emitting_tube parts is 30 mm or less, the arc_tube | light_emitting_tube parts can mutually be heat-retained with the heat | fever emitted from an arc_tube | light_emitting_tube part. Further, since the lamp housing portion is hermetically sealed, the inside of the lamp housing portion can be appropriately kept warm by the heat generated from the cold cathode fluorescent lamp. Thereby, the temperature fall of the coldest part can be suppressed and the light output of the cold cathode fluorescent lamp can be improved. Moreover, since the lighting circuit accommodating part is arrange | positioned adjacent to a lamp | ramp accommodating part, the lighting fixture reduced in thickness can be provided.

  The invention according to claim 2 is characterized in that the plurality of arc tube portions are each composed of a straight tube portion arranged substantially in parallel, and the length of the straight tube portion is not less than 300 mm and not more than 1200 mm. The lighting fixture according to 1.

  The cold cathode fluorescent lamp has a plurality of straight tube portions. Here, the cold cathode fluorescent lamp having the straight tube portion is a cold cathode fluorescent lamp having an overall shape that is a straight tube, and an overall shape that is not a straight tube. Means a cold cathode fluorescent lamp having a straight tubular portion. Therefore, having a plurality of straight tube portions means a plurality of cold cathode fluorescent lamps in the case of a cold cathode fluorescent lamp having an overall shape of a straight tube, and in the case of a cold cathode fluorescent lamp having an overall shape which is not a straight tube. Means that there are a plurality of straight tubular portions. Examples of the cold cathode fluorescent lamp that is not a straight tube as a whole and has a plurality of straight tube portions include U-shaped and H-shaped cold cathode fluorescent lamps. When the overall shape is not a straight tube, the number of cold cathode fluorescent lamps is not limited to a plurality, and may be one.

  The length of the straight tube part is set to 300 mm or more and 1200 mm or less. The lamp with a straight tube part length of 300 mm or more is optimized for the coldest part temperature because the central part of the lamp is not easily affected by the cold cathode. This is because if the length of the straight pipe portion exceeds 1200 mm, the lamp voltage increases and the inverter becomes expensive.

  According to the second aspect of the present invention, it is possible to provide a luminaire including a cold cathode fluorescent lamp having high luminous efficiency and suitable for practical use.

  The invention according to claim 3 is the luminaire according to claim 1 or 2, wherein the cold cathode fluorescent lamp includes a bent portion that connects the arc tube portions. The number of bent portions is not limited to one and may be plural. According to the third aspect of the present invention, since the electrodes of the cold cathode fluorescent lamp can be arranged on one side, it is possible to provide a lighting fixture in which the lead-in of the cold cathode fluorescent lamp is reduced.

  The invention according to claim 4 is characterized in that there are a plurality of lamp housing portions, and the lighting circuit housing portions are arranged between the lamp housing portions. It is. According to invention of Claim 4, the lighting fixture from which a favorable light distribution characteristic is acquired can be provided.

  The invention according to claim 5 further includes an adapter that is electrically connectable to a power supply section that supplies AC power and that is provided with a DC power supply circuit that includes AC-DC conversion means, and includes a lamp housing section and The lighting circuit accommodating portion can be attached to the adapter, and the lighting circuit includes an inverter circuit that converts DC power obtained by the DC power supply circuit into high-frequency power. It is a lighting fixture of 1 item | term. According to the fifth aspect of the invention, since the adapter is provided with the DC power supply circuit including the AC-DC conversion means, a compact lighting fixture can be provided.

  According to the first aspect of the present invention, it is possible to provide a light fixture that can improve the light output and is thinned. According to the second aspect of the present invention, it is possible to provide a luminaire including a cold cathode fluorescent lamp having high luminous efficiency and suitable for practical use. According to the third aspect of the present invention, it is possible to provide a lighting fixture in which the lead-in of the cold cathode fluorescent lamp is reduced. According to invention of Claim 4, the lighting fixture from which a favorable light distribution characteristic is acquired can be provided. According to invention of Claim 5, a compact lighting fixture can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. However, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, priority is given to the contents shown in the following description for specific thicknesses and dimensions.

(First embodiment)
Hereinafter, the first embodiment will be described. FIG. 1 is a plan view of a lighting fixture according to the present embodiment, FIG. 2 is a side view of the lighting fixture according to the present embodiment, and FIG. 3 is an illumination with the cover according to the present embodiment removed. It is a top view of an instrument.

  As shown in FIGS. 1 to 3, the luminaire 1 includes a sealed lamp housing portion 2 and a lighting circuit housing portion 3 disposed adjacent to the lamp housing portion 2. In the present embodiment, the lighting circuit housing part 3 is adjacent to one end of the lamp housing part 2.

  The lamp housing portion 2 includes a housing portion main body 2a and covers 2b and 2c as light transmitting portions that cover the housing portion main body 2a. The cover 2b covers a light emitting portion of the cold cathode fluorescent lamp 4 to be described later, and is made of a translucent material such as acrylic. Moreover, you may comprise the cover 2b from what gave milky white coating to the translucent material. The cover 2c covers an end portion that is a non-light emitting portion of the cold cathode fluorescent lamp 4, and is made of, for example, a light shielding material.

  The lighting circuit accommodating portion 3 includes an accommodating portion main body 3a that is integrally formed so as to be adjacent to the accommodating portion main body 2a, and a cover 3b that covers the accommodating portion main body 3a. The cover 3b mainly covers the lighting circuit 6 which will be described later. In the present embodiment, the cover 3b covers not only the lighting circuit 6 but also the other end of the cold cathode fluorescent lamp 4. The cover 3b is made of a light shielding material or the like. In addition, in this Embodiment, although the accommodating part main body 2a and the accommodating part main body 2b are integrally formed, you may form separately, respectively.

  In the lamp housing 2, two straight-tube cold-cathode fluorescent lamps 4 are arranged in parallel to each other so that the distance d between the straight tube portions 4a (light emitting tube portions) is 30 mm or less. In the present embodiment, two cold cathode fluorescent lamps 4 are arranged, but three or more may be arranged. In this case, it arrange | positions mutually parallel so that the space | interval d between the straight pipe parts 4a may be 30 mm or less, respectively. Further, instead of the straight tubular cold cathode fluorescent lamp 4, for example, a cold cathode fluorescent lamp having a U-shaped straight tube portion and a bent portion may be arranged. In this case, a cold cathode fluorescent lamp having a distance between straight tube portions of 30 mm or less is used.

  A mounting hole 2d is formed between the cold cathode fluorescent lamps 4 of the housing main body 2a, and the luminaire 1 is mounted on a wall such as a ceiling via the mounting hole 2d. Then, as for the space | interval d between the straight pipe parts 4a, 10 mm or more and 30 mm or less are preferable.

  The cold cathode fluorescent lamp 4 has a structure in which electrodes 4b are disposed at both ends. Further, the cold cathode fluorescent lamp 4 has a tube diameter of 10 mm or less, and a length of the straight tube portion 4 a of 300 mm or more and 1200 mm or less. Here, the length of the straight pipe portion 4a is set to 300 mm or more because when the length of the straight pipe portion 4a is 300 mm or more, the temperature drop in the coldest part is particularly remarkable and the luminous efficiency is high. . Further, the length of the straight tube portion 4a is set to 1200 mm or less because when the length of the straight tube portion 4a exceeds 1200 mm, it becomes longer than FL40, which is a generally straight tube hot cathode lamp. Because it is not practical. Further, since the tube diameter of the cold cathode fluorescent lamp 4 is as thin as 10 mm or less, if the straight tube portion 4a is extremely long, it may break during transportation. Furthermore, the lamp voltage becomes very high because the inverter circuit becomes larger and the cost increases, which is not preferable.

  The cold cathode fluorescent lamp 4 is fixed at a predetermined position in the lamp housing portion 2. Specifically, the cold cathode fluorescent lamp 4 is disposed at predetermined positions on both ends of the cold cathode fluorescent lamp 4, and an L-shaped electrical insulation that insulates the lead-in wire 4c drawn from both ends of the cold cathode fluorescent lamp 4 is used. A member 5 (for example, a mouth rubber) is attached. On the other hand, guides 2e are formed along the inner side surface of the electrical insulating member 5 in the housing main bodies 2a and 3a. By disposing the electric insulating member 5 along the guide 2e in a state where the electric insulating member 5 is attached to both ends of the cold cathode fluorescent lamp 4, the covers 2c and 3b are screwed to the housing main body 2a in that state. The cold cathode fluorescent lamp 4 is fixed at a predetermined position in the lamp housing portion 2.

  A lighting circuit 6 for lighting the cold cathode fluorescent lamp 4 is accommodated in the lighting circuit accommodating portion 3. The lighting circuit 6 is electrically connected to the lead-in wire 4 c of the cold cathode fluorescent lamp 4. The lighting circuit 6 includes an inverter circuit (not shown) that converts DC power obtained by a DC power supply circuit 9a described later into high-frequency power. In addition, an opening 3c is formed in the housing portion main body 3a, and the power cable 7 is electrically connected to the lighting circuit 6 through the opening 3c. The power cable 7 can be electrically connected to an adapter 9 described later.

  The specific dimensions of the luminaire 1 are, for example, the lamp housing portion 2 having a width of 50 mm, a length of 520 mm, and a thickness of 20 mm, and the lighting circuit housing portion 3 having a width of 50 mm, a length of 60 mm, and a thickness of 18 mm. In the case of the size, two straight-tube cold cathode fluorescent lamps 4 having a tube diameter of 4.0 mm and a length of 500 mm can be arranged in the lamp housing portion 2 with an interval of 25 mm. The lighting circuit 6 having a width of 40 mm, a length of 40 mm, and a thickness of 10 mm can be disposed. In this case, for example, a cold cathode fluorescent lamp 4 having a lamp current of 7 mA and a lamp power of 6 W and a voltage at both ends of the lamp of about 900 V can be used.

  Such a lighting fixture 1 is used as follows, for example. FIG. 4 is a schematic block diagram showing an electrical connection state of the lighting fixture 1 according to the present embodiment.

  As shown in FIG. 4, a power supply unit 8 such as a hanging ceiling is installed on a wall surface such as a ceiling. In addition, when hook ceiling is used as the power supply unit 8, wiring can be easily performed in a general house.

  The power supply unit 8 includes a DC power supply circuit 9a including an AC-DC conversion circuit (for example, an AC-DC converter) serving as AC-DC conversion means for generating DC power from commercial AC power, and a DC power supply circuit 9a. An adapter 9 incorporating a booster circuit 9b for boosting the DC power generated by the above is attached. A plurality of lighting fixtures 1 are electrically connected to the adapter 9, and the DC power boosted by the booster circuit 9 b is input to the inverter circuit of the lighting circuit 6.

  In the present embodiment, since the lamp housing portion 2 is sealed and the distance d between the straight tube portions 4a is 30 mm or less, the light output of the cold cathode fluorescent lamp 4 can be improved. That is, in the case of the straight tubular cold cathode fluorescent lamp 4, the coldest part is formed in the middle part of the cold cathode fluorescent lamp 4 farthest from the electrode 4b, but the interval d between the straight tube parts 4a is 30 mm or less. Therefore, they are kept warm by the heat generated from the cold cathode fluorescent lamp 4. Further, since the lamp housing 2 is sealed, the inside of the lamp housing 2 is appropriately kept warm by the heat generated from the cold cathode fluorescent lamp 4. Thereby, the temperature fall of the coldest part can be suppressed and the light output of the cold cathode fluorescent lamp 4 can be improved.

  In the present embodiment, since the lighting circuit housing portion 3 is disposed adjacent to the lamp housing portion 2, the lighting fixture 1 having a reduced thickness can be provided.

  In the present embodiment, since the adapter 9 incorporates the DC power supply circuit 9a including the AC-DC conversion circuit, the compact lighting fixture 1 can be provided. That is, if the DC power supply circuit 9a is built in each of the lighting fixtures 1, the lighting fixture 1 will be enlarged. On the other hand, since the DC power supply circuit 9a is provided outside the lighting fixture 1 and the DC power supply circuit 9a is shared by the plurality of lighting fixtures 1, the compact lighting fixture 1 can be provided. For the same reason, it is preferable to incorporate the booster circuit 9b in the adapter 9 as in the present embodiment, but the lighting circuit 6 may be provided with the booster circuit 9b.

  In the present embodiment, since the adapter 9 incorporates a DC power supply circuit 9 a having an AC-DC conversion circuit, a general-purpose inverter circuit can be used as the inverter circuit of the lighting circuit 6. Moreover, the lighting fixture 1 can be added easily.

(Second Embodiment)
Hereinafter, a second embodiment will be described. In this embodiment, an example using a U-shaped cold cathode fluorescent lamp will be described. FIG. 5 is a plan view of the luminaire according to the present embodiment, FIG. 6 is a side view of the luminaire according to the present embodiment, and FIG. 7 is the illumination with the cover according to the present embodiment removed. It is a top view of an instrument.

  As shown in FIGS. 5 to 7, the two lamp accommodating portions 2 are arranged in parallel to each other. Between the lamp housing portions 2, two lighting circuit housing portions 3 are arranged adjacent to the lamp housing portion 2. Specifically, the lighting circuit housing portion 3 is disposed near one end of the lamp housing portion 2, and the lighting circuit housing portion 3 is disposed near the other end of the lamp housing portion 2.

  In the lamp housing portion 2, U-shaped cold cathode fluorescent lamps 11 each having two straight tube portions 11a (light emitting tube portions) arranged in parallel to each other and a bent portion 11b connecting the straight tube portions 11a are arranged. ing. The cold cathode fluorescent lamp 11 is formed so that the distance d between the straight tube portions 11a is 30 mm or less. In the present embodiment, the U-shaped cold cathode fluorescent lamps 11 are arranged in the lamp housing portion 2, respectively, but the straight tubular cold cathode fluorescent lamps 4 are respectively provided in the same manner as in the first embodiment. It may be arranged. In this case, it arrange | positions mutually parallel so that the space | interval d between the straight pipe parts 4a may be 30 mm or less.

  Both the electrodes 11 c of the cold cathode fluorescent lamp 11 are arranged on the end side of the cold cathode fluorescent lamp 11. The introduction lines 11 d of the cold cathode fluorescent lamp 11 are electrically connected to the lighting circuit 6, respectively. Specifically, the introduction line 11 d of one cold cathode fluorescent lamp 11 is connected to one lighting circuit 6, and the introduction line 11 d of the other cold cathode fluorescent lamp 11 is connected to the other lighting circuit 6. . Here, the shorter lead wire 11d is on the high potential side, and the longer lead wire 11d is on the ground potential side.

  The cover 2b of the lamp housing portion 2 covers the housing portion main body 2a from one end of the housing portion main body 2a to the other end, but the cover 2b covering the non-light emitting portion of the cold cathode fluorescent lamp 11 The portion 2 f (hereinafter, this portion is referred to as “non-light emitting covering portion”) is subjected to a process of hiding or blurring the non-light emitting portion of the cold cathode fluorescent lamp 11 in appearance. As such processing, for example, the transmittance of the non-light emitting covering portion 2f is set to the portion 2g of the cover 2b covering the light emitting portion of the cold cathode fluorescent lamp (hereinafter, this portion is referred to as “light emitting covering portion”). For example, a process for lowering the transmittance of light, a process for improving the diffusibility of the non-light-emitting covering portion 2f, and a non-transmissive process. As a process for reducing the transmittance of the non-light-emitting covering portion 2f, for example, when silk printing or the like is not performed on the light-emitting covering portion 2g, a process such as performing silk printing or the like on the non-light-emitting covering portion 2f, Or when silk printing etc. are given to the whole surface of the cover 2b, the process of thickening the thickness of the non-light emission covering part 2f from the light emission covering part 2g is mentioned. Examples of the processing for improving the diffusibility of the non-light emitting covering portion 2f include prism formation processing and frost processing, and the non-transmission processing includes processing for shielding the non-light emitting covering portion 2f and the like. The non-light-emitting portion of the cold cathode fluorescent lamp 11 refers to a portion closer to the end than the tip of the electrode 11 c of the cold cathode fluorescent lamp 11 or a portion closer to the end than the tip of the electrical insulating member 5. Inside the non-light emitting covering portion 2f, a heat-resistant component 12 such as a metal plate is disposed.

  The specific dimensions of the luminaire 1 are, for example, the lamp housing portion 2 having a width of 50 mm, a length of 520 mm, and a thickness of 20 mm, respectively, and the lighting circuit housing portion 3 having a width of 50 mm, a length of 60 mm, and a thickness, respectively. In the case of a size of 18 mm, a U-shaped cold cathode fluorescent lamp 11 having a tube diameter of 4.0 mm, a tube length of 1020 mm, and a straight tube portion interval of 25 mm can be disposed in the lamp housing portion 2, and a lighting circuit housing portion 3, a lighting circuit 6 having a width of 40 mm, a length of 40 mm, and a thickness of 10 mm can be arranged. In this case, a cold cathode fluorescent lamp 11 having a lamp current of 7 mA and a lamp power of 10 W and a voltage at both ends of the lamp of about 1800 V can be used.

  In the present embodiment, since the lamp housing portion 2 is sealed and the distance d between the straight tube portions 11a is 30 mm or less, the light output of the cold cathode fluorescent lamp 11 can be improved. That is, in the case of the U-shaped cold cathode fluorescent lamp 11, the coldest part is formed in the bent part 11b farthest from the electrode 11c. Here, when the distance d between the cold cathode fluorescent lamps 11 is 30 mm or less, the heat is generated by the heat generated from the straight tube portion 11a, so that the coldest portion is formed in the bent portion 11b. However, it is thought that the temperature fall of the coldest part can be suppressed. Thereby, the light output of the cold cathode fluorescent lamp 11 can be improved.

  In this embodiment, since the cold cathode fluorescent lamp 11 is formed in a U shape, the electrode 11c of the cold cathode fluorescent lamp 11 is arranged on one side. Thereby, the lighting fixture 1 which reduced the routing of the introductory line 11d can be provided.

  In this Embodiment, since the lighting circuit accommodating part 3 is arrange | positioned between the lamp | ramp accommodating parts 2, the lighting fixture 1 from which a favorable light distribution characteristic is acquired can be provided.

  In the present embodiment, the cover 2b covers the housing part main body 2a from one end to the other end of the housing part main body 2a, and the non-light emitting part of the cold cathode fluorescent lamp 11 is provided on the non-light emitting cover part 2f. Since the process of concealing or fading the appearance is performed, the number of parts can be reduced and the appearance can be improved. Moreover, in this Embodiment, since the component 12 which has heat resistance is arrange | positioned inside the non-light-emitting covering part 2f, the deformation | transformation of the cover 2b at the time of lamp lighting accompanying the thickness reduction can be suppressed.

(Third embodiment)
The third embodiment will be described below. In the present embodiment, an example will be described in which a lighting circuit housing portion is connected to both ends of the lamp housing portion. 8 is a plan view of the luminaire according to the present embodiment, FIG. 9 is a side view of the luminaire according to the present embodiment, and FIG. 10 is an illumination with the cover according to the present embodiment removed. Fig. 11 is a plan view of the fixture, and Fig. 11 is a diagram schematically showing the installation state of the lighting fixture according to the present embodiment.

  As shown in FIGS. 8 to 10, the lighting circuit housing portions 3 are connected to both ends of the lamp housing portion 2. The accommodating portion main body 2 a and the accommodating portion main body 3 a are integrally formed, and the accommodating portion main bodies 2 a and 3 a are covered with a cover 13. The cover 13 is made of, for example, a translucent material such as acrylic that is milky white coated.

  In the lamp housing part 2, eight straight-tube cold cathode fluorescent lamps 4 are arranged in parallel to each other so that the distance d between the straight pipe parts 4a is 30 mm or less. A total of four lighting circuits 6 are housed in the lighting circuit housing portion 2 two by two. The lead-in wires 4 b of the cold cathode lamps 4 are electrically connected to the lighting circuit 6 so that the two cold cathode lamps 4 correspond to one lighting circuit 6. The introduction line 6b on the secondary side of the lighting circuit 6 is provided to be shorter than the introduction line (not shown) on the primary side of the lighting circuit 6.

  As shown in FIG. 11, such a lighting fixture 1 is installed on a wall surface such as a ceiling by being suspended by a suspension wire 14. In the present embodiment, the power cable 7 is drawn from the back side of the lighting fixture 1.

It is a top view of the lighting fixture which concerns on 1st Embodiment. It is a side view of the lighting fixture which concerns on 1st Embodiment. It is a top view of the lighting fixture of the state which removed the cover which concerns on 1st Embodiment. It is a typical block diagram which shows the electrical connection state of the lighting fixture which concerns on 1st Embodiment. It is a top view of the lighting fixture which concerns on 2nd Embodiment. It is a side view of the lighting fixture which concerns on 2nd Embodiment. It is a top view of the lighting fixture of the state which removed the cover which concerns on 2nd Embodiment. It is a top view of the lighting fixture which concerns on 3rd Embodiment. It is a side view of the lighting fixture which concerns on 3rd Embodiment. It is a top view of the lighting fixture of the state which removed the cover which concerns on 3rd Embodiment. It is a figure which shows typically the installation state of the lighting fixture of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Lamp accommodating part, 3 ... Lighting circuit accommodating part, 4,11 ... Cold cathode fluorescent lamp, 4a, 11a ... Straight pipe | tube part, 9 ... Adapter, 9a ... DC power supply circuit, 11b ... Bending part.

Claims (5)

A sealed lamp housing with a light transmitting part;
A lighting circuit housing disposed adjacent to the lamp housing;
A cold-cathode fluorescent lamp having a plurality of light-emitting tube portions respectively arranged so that a distance between them is 30 mm or less, and housed in the lamp housing portion;
A lighting circuit that is housed in the lighting circuit housing portion and lights the cold cathode fluorescent lamp;
The lighting fixture characterized by comprising.   2. The lighting apparatus according to claim 1, wherein each of the plurality of arc tube portions includes a straight tube portion disposed substantially in parallel, and the length of the straight tube portion is not less than 300 mm and not more than 1200 mm.   The luminaire according to claim 1 or 2, wherein the cold cathode fluorescent lamp includes a bent portion that connects the arc tube portions.   The lighting fixture according to any one of claims 1 to 3, wherein there are a plurality of lamp housing portions, and the lighting circuit housing portions are disposed between the lamp housing portions.   An adapter that is electrically connectable to a power supply unit that supplies AC power and that is provided with a DC power supply circuit having AC-DC conversion means is further provided, and the lamp housing unit and the lighting circuit housing unit are connected to the adapter. The lighting apparatus according to claim 1, wherein the lighting circuit includes an inverter circuit that converts DC power obtained by a DC power supply circuit into high-frequency power.

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