JP2006269298A - Illumination apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination apparatus with long life and high safety capable of obtaining sufficient lightness as a general lighting apparatus and reducing its thickness. <P>SOLUTION: The illumination apparatus is composed of a nearly flat plate-shaped main body case 2 having a mounting means for mounting on a mounting face, a plurality of cold cathode fluorescent lamp mounted on the main body case, of which bulb wall loading of positive columnar is not less than 0.05 [W/cm<SP>2</SP>] and not higher than 0.2 [w/cm<SP>2</SP>], and lamp voltage is not less than 300 V and less than 1,000 [V] at rated lighting, and a lighting circuit having an input terminal part of commercial power supply line. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a general lighting fixture using a cold cathode fluorescent lamp as a light source.

  In general, as a lighting fixture having a relatively small light output, for example, a lighting fixture equipped with a hot cathode fluorescent lamp with power consumption of about 30 W or less is known. The characteristics of “FL20”, which is an example of this hot cathode fluorescent lamp, are power consumption of 20 W, total luminous flux of about 1170 lm, total length of about 580 mm, and lamp life of about 8500 hours. Therefore, the lamp efficiency is about 59 lm / W, and the total luminous flux per 1 cm of the lamp length is about 20 lm / cm.

On the other hand, in recent years, lighting fixtures using cold cathode fluorescent lamps have also been proposed (see, for example, Patent Documents 1 and 2). Since this cold cathode fluorescent lamp has a tube diameter much thinner than that of the hot cathode fluorescent lamp, for example, 5 mm or less, it is possible to make the lighting fixture thin and have a longer life than the hot cathode fluorescent lamp. .
JP 2001-14904 A JP 2003-297141 A

  However, cold cathode fluorescent lamps have the problems that the amount of light per lamp is small, the luminous efficiency is low, and the lamp voltage is high. For this reason, luminaires using cold cathode fluorescent lamps are rarely used in general lighting fields such as houses and facilities.

  And in the lighting fixture of patent document 1, since the inverter circuit which generate | occur | produces the high voltage of 1000-2000V or more is used as a lighting circuit of a cold cathode fluorescent lamp (refer to [0018]), in the field for general lighting, it is a safety aspect. There is a problem.

  For example, the “Electrical Appliance and Material Safety Law” stipulates that the rated secondary voltage of the lighting circuit is 1000 V or less. Further, in the “extension rule”, when a lamp having an input voltage exceeding 1000V is used, a complicated safety standard is set, and the lamp voltage is desirably set to 1000V or less.

  However, the luminaire described in Patent Document 1 is not practical because it does not take into account the electrical configuration for complying with the above legal regulations in spite of the use of a cold cathode fluorescent lamp exceeding 1000V. .

  Moreover, in the lighting fixture of patent document 2, when a user enters a toilet at night and half awakening, it is limited to the toilet lighting fixture for suppressing glare so as not to give the user a light stimulus that awakens. Therefore, sufficient brightness for general illumination cannot be expected, and for example, it cannot be replaced or replaced with a general illumination luminaire using a FL20 hot cathode fluorescent lamp.

  The present invention has been made in view of such circumstances, and provides a lighting device that can obtain sufficient brightness as a general lighting device, has a long life, is highly safe, and can be thinned. The purpose is to do.

The invention according to claim 1 is a substantially flat instrument body having means for attaching to a surface to be attached; a positive column wall load at 0.05 to 0.2 [W / cm ² ] at a rated lighting, a lamp A plurality of cold-cathode fluorescent lamps having a voltage of 300 or more and less than 1000 [V], arranged in parallel to the appliance body; and a lighting circuit provided in the appliance body and provided with an input terminal portion of a commercial power source; It is the lighting fixture characterized by having.

  In the first and subsequent claims, the positive column wall load is as follows.

The positive column wall load is expressed by Wp / (π × D × Lp) when the positive column power Wp, the tube inner diameter D, and the electrode distance Lp are used. Here, the positive column power Wp is expressed by W _L −l _L × Vc when the lamp power W _L , the lamp current l _L , and the electrode drop voltage Vc are used. The electrode drop voltage Vc conceptually corresponds to a lamp voltage when the interelectrode distance Lp is extremely short (for example, 3 mm or less), but it is not realistic to measure the electrode drop voltage Vc in this state. Therefore, the lamp voltage _VL of a plurality of lamps having different tube lengths is measured to obtain a first-order approximate line indicating the change of the lamp voltage with respect to the interelectrode distance Lp, and the lamp voltage _VL when the interelectrode distance Lp = 0 is substantially equal to the electrode. It can be considered that the voltage drop Vc. Usually, since the electrode drop voltage Vc of the cold cathode fluorescent lamp is about 120V, if the lamp voltage _VL is relatively large, for example, 500V or more, the electrode drop voltage Vc = 120V may be calculated.

The invention according to claim 2 is characterized in that the cold cathode fluorescent lamp has a tube wall load of 0.05 or more and 0.15 [W / cm ² ] or less in rated lighting. It is.

The invention according to claim 3, wherein the cold cathode fluorescent lamp, claim ratio of positive column power Wp and the lamp power W _L [Wp / W _L] is equal to or less than 1 0.8 or 1 or 2. The lighting apparatus according to 2.

  According to a fourth aspect of the present invention, the cold cathode fluorescent lamp has a lamp current of 3 to 10 mA, a tube inner diameter of 2 to 4 [mm] and a lamp length of 300 to 700 [mm] at rated lighting. A lighting fixture according to any one of claims 1 to 3.

According to the first aspect of the present invention, since the positive column wall load is 0.2 [W / cm ² ] or less in rated lighting, a lamp having a long life exceeding 10,000 hours can be realized. In addition, since the positive column wall load is 0.05 [W / cm ² ] or more, a sufficient amount of light can be obtained.

  As described above, since the cold cathode fluorescent lamp generally has a high lamp voltage, there is a problem in safety when used in the general lighting field. For example, the “Electrical Appliance and Material Safety Law” stipulates that the rated secondary voltage of the lighting circuit is 1000 V or less. Even in the “extension rule”, when a lamp whose input voltage exceeds 1000 V is used, it is complicated. Safety standards are set. That is, it is desirable that the lamp voltage is 1000 V or less from the viewpoint of safety. The cold cathode fluorescent lamp of the present invention is highly safe because the lamp voltage is set to less than 1000 V in consideration of product variations.

  On the other hand, when the lamp voltage is set to 300 V or less, the electrode drop voltage of the cold cathode fluorescent lamp is approximately 100 to 150 V, and the luminous efficiency decreases due to the increase of the ratio of the electrode drop voltage to the lamp voltage. So undesirable. However, in the cold cathode fluorescent lamp according to the present invention, since the lamp voltage is set to 300 V or higher, a luminous efficiency of 50 to 60 lm / W can be obtained. Therefore, the luminous efficiency is equivalent to that of the hot cathode fluorescent lamp whose power consumption is approximately 30 W or less.

  In addition, such a cold cathode fluorescent lamp can have a total luminous flux of about 6 to 10 lm per 1 cm of the lamp length. Therefore, by arranging a plurality of cold cathode fluorescent lamps, for example, 2 to 5 in parallel, the power consumption in a hot cathode fluorescent lamp whose power consumption is approximately 30 W or less can be made substantially equal. In addition, one cold cathode fluorescent lamp is too small in light quantity, and is not suitable for replacement with a hot cathode fluorescent lamp lighting fixture. On the other hand, if the number is 6 or more, the total luminous flux per 1 cm of the lamp length is too high and the power consumption becomes high.

  The luminaire according to the present invention thus obtained can be directly replaced with a luminaire using a conventional hot cathode fluorescent lamp. That is, it is possible to obtain a lighting device that has the same power consumption, substantially the same brightness, and high safety. Furthermore, it can be formed into a thin shape with a longer life than a luminaire using a hot cathode fluorescent lamp.

According to the invention of claim 2, since the positive column wall load is 0.15 [W / cm ² ] or less at rated lighting, a long-life cold cathode fluorescent lamp with a lamp life exceeding 30000 hours can be realized. . Also, if the lamp life exceeds 30000 hours, the life of the other members of the lighting fixture, for example, the lighting circuit and resin parts, is almost equivalent to that, so that the whole lighting fixture will be at the end of life, and only the cold cathode fluorescent lamp can be replaced. There is no need. Further, in rated lighting of the cold cathode fluorescent lamp, since the positive column wall load is 0.05 [W / cm ² ] or more, a sufficient amount of light can be obtained for general illumination.

In general, in the case of a cold cathode fluorescent lamp, a higher electrode drop voltage than the hot cathode fluorescent lamp is one of the causes of low luminous efficiency. However, according to the invention according to claim 3, since the ratio Wp / W _L of the positive column electric power Wp and the lamp power W _L is set to 0.8 or more, can be achieved with high luminous efficiency cold cathode fluorescent lamp. In the case of a cold cathode fluorescent lamp, because of the electrode voltage drop, Wp / W _L becomes always less than 1.

  According to the invention of claim 4, since the lamp current is 3 to 10 mA, the problem is the case where the lamp current is 10 mA or more, the positive column wall load becomes too high, and the life is shortened. This is a problem when the lamp current is 3 mA or less. The amount of light is reduced, and it is possible to eliminate the point that it is inappropriate to replace with a lighting apparatus using a hot cathode fluorescent lamp.

  In other words, according to the present invention, the lamp life can be extended and replaced with a lighting fixture equipped with a hot cathode fluorescent lamp.

  In the case of a cold cathode fluorescent lamp, if the tube inner diameter is less than 2 mm, the amount of light per lamp is small, so it is difficult to replace a lighting fixture equipped with a hot cathode fluorescent lamp. For this reason, if the lamp current is increased, the amount of light increases, but the positive column wall load becomes too large, and the lamp life is shortened. On the other hand, if the lamp length is increased, the lamp voltage becomes too high, and if it exceeds 4 mm, there is a problem that the light emission efficiency cannot be increased.

  Therefore, according to the present invention, since the inner diameter of the cold cathode fluorescent lamp is 2 to 4 mm, a sufficient amount of light that can be replaced by a lighting device equipped with a hot cathode fluorescent lamp can be obtained and the lamp life can be extended. In addition, the luminous efficiency can be increased.

  Furthermore, in general, in the case of a cold cathode fluorescent lamp, the electrode drop voltage is higher than that of the hot cathode fluorescent lamp, which contributes to low luminous efficiency. For example, when the lamp length is 300 mm or less, since the lamp voltage is low, the influence of the electrode drop voltage is relatively large, and the light emission efficiency cannot be increased. On the other hand, the lamp voltage becomes too high at 700 mm or more.

  Therefore, according to the present invention, since the cold cathode fluorescent lamp is formed in a thickness of 300 to 700 [mm], the luminous efficiency can be increased.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on a plurality of attached drawings. In the accompanying drawings, the same or corresponding parts are denoted by the same reference numerals.

  1 is a plan view of a lighting fixture according to a first embodiment of the present invention, FIG. 2 is a right side view thereof, and FIG. 3 is a front view thereof.

  As shown in these drawings, the luminaire 1 has a main body case 2 made of synthetic resin, which is an example of a luminaire body, and has a transparent flat rectangular tube shape. This main body case 2 is closed by fixing a pair of left and right end lid portions 3a, 3b made of synthetic resin in the longitudinal direction at both ends in the longitudinal direction. For example, four cold cathode fluorescent lamps 4, 4,... Are formed in a lamp housing portion 2a that is arranged in parallel approximately at an interval of 5 to 10 mm, for example, 7 mm in the radial direction. The dimensions of the lamp housing portion 2a are, for example, in the plan view shown in FIG. 1, the vertical dimension is 30 to 50 mm, for example 40 mm, the lateral dimension is 400 to 500 mm, for example 420 mm, and the height dimension (thickness) is 15 to 30 mm, for example 20 mm. It is.

  1 and 3, the left end cover 3a has a socket portion 3c made of synthetic resin in the shape of a vertically long rectangular tube integrally or integrally protruding at the inner end thereof. The socket portion 3c protrudes and fits into the left opening end of the case body 2 in FIGS. On the inner end surface of the socket portion 3c, a socket (not shown) is formed in which one of the pair of caps of each cold cathode fluorescent lamp 4 is detachably mounted and electrically connected.

  On the other hand, the right end cover part 3b in FIGS. 1 and 3 is provided with a lighting circuit housing part 5 made of a synthetic resin and having a flat rectangular tube shape integrally or integrally at its inner end. The lighting circuit housing portion 5 has, for example, a length of 50 mm, a width of 60 mm, and a height (thickness) of 18 mm, and houses electrical components such as an inverter of the lighting circuit therein. The inverter inputs AC 100 to 240 V to supply high frequency power of 20 to 500 KHz to the cold cathode fluorescent lamp 4. An external power supply line (not shown) electrically connected to the inverter is drawn through an input terminal portion 3b1 having a cord lead-in hole formed at the outer end of the right end lid portion 3b. The dimensions of this inverter are, for example, 40 mm in length, 40 mm in width, and 10 mm in height (thickness). A socket (not shown) is formed on the inner end portion (left end portion in FIGS. 1 and 3) of the end lid portion 3b to which the bases of the cold cathode fluorescent lamps 4 are detachably mounted and electrically connected. . The luminaire 1 configured as described above is unitized by integrally configuring the main body case 2 and the cold cathode fluorescent lamp 4, and does not have a structure in which only the cold cathode fluorescent lamp 4 can be replaced. On the back side of the main body case 2, mounting means 2 b for mounting the main body case 2 on an instrument mounting surface such as a ceiling surface is disposed. The attachment means 2b is, for example, a protrusion with a screw hole or an adapter.

Each cold cathode fluorescent lamp 4 is a straight tube having a tube outer diameter of 3.0 mm, a tube inner diameter of 2.0 mm, a length of 400 mm, and a distance between electrodes of 386 mm. The rated lighting conditions are a lamp current of 5 mA and a lamp power of 4 0.5 W, voltage at both ends of the lamp (lamp voltage) 900 V, total luminous flux 250 lm, and electrode drop voltage Vc is estimated to be 120 V, for example. Therefore, positive column load at the rated ^{lit, 0.16 [W / cm 2]} , the ratio Wp / _{W L} of the positive column electric power Wp and the lamp power _{W L} is 0.87. The lamp life (the time when the luminous flux maintenance factor becomes 70%) is about 20,000 hours.

  The power consumption of the luminaire 1 configured in this way is 20 W, and the illuminance immediately below 2 m when the luminaire 1 is installed on the ceiling surface 1 as the mounted surface is 110 lx.

  Next, the lighting fixture which concerns on 2nd Embodiment of this invention is shown.

  The lamp housing portion 2a has a length of 40 mm, a width of 520 mm, and a height (thickness) of 20 mm. The cold cathode fluorescent lamp 4 is a straight tube having a tube outer diameter of 4.0 mm, a tube inner diameter of 3.0 mm, a length of 500 mm, and an interelectrode distance of 486 mm, and three lamps are arranged in parallel at an interval of 10 mm. .

The rated lighting conditions of the cold cathode fluorescent lamp 4 are a lamp current of 7 mA, a lamp power of 6 W, a voltage at both ends of the lamp (lamp voltage) of 900 V, a total luminous flux of 350 lm, and an electrode drop voltage is estimated to be about 120 V. Thus, the positive column load 0.12 [W / ^cm 2] in rated lighting, the ratio Wp / _{W L} of the positive column electric power Wp and the lamp power _{W L} is 0.87.

The dimensions of the lighting circuit housing 5 are, for example, 50 mm in length, 60 mm in width, and 18 mm in height (thickness). The dimensions of the inverter are, for example, 40 mm in length, 40 mm in width, 10 mm in height (thickness), and lamp life. Is approximately 50,000 hours. The power consumption of the luminaire 1 configured in this way is 21 W, and the illuminance of 2 m immediately below when the luminaire 1 is installed on the ceiling surface is 110 lx. On the other hand, in the case of a lighting fixture using one hot cathode fluorescent lamp FL20 for comparison, the power consumption was 22 W and the illuminance was 120. Therefore, the luminaire 1 according to this embodiment can be replaced or replaced with a luminaire using FL20.

  Next, the lighting fixture which concerns on 3rd Embodiment of this invention is shown.

  The lamp housing portion 2a has a length of 30 mm, a width of 520 mm, and a height (thickness) of 20 mm. The cold cathode fluorescent lamp 4 is a straight tube having a tube outer diameter of 4.0 mm, a tube inner diameter of 3.0 mm, a length of 500 mm, and a distance between electrodes of 486 mm, and two of them are arranged in parallel at an interval of 10 mm. .

The rated lighting conditions of the cold cathode fluorescent lamp 4 are as follows: the lamp current is 9 mA, the lamp power is 7.5 W, the voltage at both ends of the lamp (lamp voltage) is 850 V, the total luminous flux is 400 lm, and the electrode drop voltage Vc is estimated to be about 120 V. Is done. Thus, the positive column load 0.14 [W / ^cm 2] in rated lighting, the ratio Wp / _{W L} of the positive column electric power Wp and the lamp power _{W L} is 0.86. The lamp life is about 30,000 hours.

  And the dimension of the lighting circuit accommodating part 5 is 50 mm in length, 60 mm in width, and height (thickness) 18 mm, for example, and the dimension of an inverter is 40 mm in length, 40 mm in width, and height (thickness) 10 mm, for example.

  The power consumption of the lighting fixture 1 configured in this way is 21 W, and the illuminance immediately below 2 m when the lighting fixture 1 is installed on the ceiling surface is 110 lx. Therefore, the luminaire 1 according to this embodiment can be replaced or replaced with a luminaire using FL20 as in the second embodiment.

The cold cathode fluorescent lamp 4 of the lighting fixture according to the fourth embodiment of the present invention has a tube outer diameter of 3.0 mm, a tube inner diameter of 2.0 mm, a length of 200 mm, rated lighting conditions of a lamp current of 7 mA, a lamp power of 3. 5 W, voltage at both ends of the lamp (lamp voltage) 750 V, total luminous flux 150 lm, and electrode drop voltage is estimated to be about 120 V. Therefore, positive column load in rated lighting is 0.19 [W / ^cm 2], the ratio Wp / _{W L} of the positive column electric power Wp and the lamp power _{W L} 0.74, lamp life is 10,000 hours.

  FIG. 4 is a front view of a lighting fixture 1A according to a fifth embodiment of the present invention. This luminaire 1A is characterized in that a reflector 6 is disposed on the back side of each cold cathode fluorescent lamp 4 on the side opposite to the light exit surface, and the other illumination is shown in FIGS. It is comprised similarly to the instrument 1. FIG.

  The reflection plate 6 is made of, for example, a white sheet or the like, and is placed and fixed integrally on the back side inner bottom surface of the main body case 2. According to this luminaire 1A, the light on the back side of each cold cathode fluorescent lamp 4 can be reflected to the light exit surface side, so that the light distribution that concentrates the light from each cold cathode fluorescent lamp 4 to the light exit surface side is performed. Obtainable. The reflector 6 may be a U-shaped reflector 6a shown in FIG.

  FIG. 6 is an electronic circuit diagram of Example 7 of the inverter. The inverter 7 forms a DC power supply unit by the rectifying element REC1 and the smoothing electrolytic capacitor C2, and the switching elements Q1 and Q2 are alternately turned on and off by the output of the tertiary winding 8c of the transformer 8 so-called push. It is a pull inverter. The capacitor C3 performs parallel resonance with the primary winding 8a of the transformer 8. C6, C5 and Q3 are lamp voltage detection means, and C8, C9 and Q4 are output control means for controlling switching of Q1. In FIG. 6, the secondary side 8b of the transformer 8, the capacitors 9a and 9b, which are current limiting elements, and the high-voltage side connector 10 are high-voltage components of about 1600 Vrsm, for example, and other low-voltage components of about 10 to 500 Vrsm, for example. It is.

  FIG. 7 is a perspective view of the front surface side of the inverter 7 and FIG. As shown in these drawings, the inverter 7 has the surface of one substrate 11 formed on a component mounting surface 11a on which electrical components are mounted, while the circuit pattern 12 is formed on the back surface 11b of the substrate. This board 11 is composed of a low-voltage / high-pressure mixed board on which both high-voltage parts and low-voltage parts are mounted. Surface-mount parts are used for the high-voltage parts 8a, 9a, 9b, 10 and lead wires are used for the low-voltage parts 13. Discrete parts (lead parts) or surface mount products having

  Therefore, as shown in FIG. 8, in the discrete component of the low-voltage component, the lead wire is inserted from the base surface 11a to the back surface 11b side, and after the leading end portion is cut off, the lead wire cut portion protruding slightly outward 14 is formed, but the high voltage components 8a, 9a, 9b, and 10 are surface-mounted on the substrate surface 11a. Therefore, the lead wire cut portion 14 is provided in the area 15 on the back surface 11b side where the high voltage components 8a to 10 are mounted. Not formed.

  Therefore, if the lead wire cut portion 14 is of a high voltage component, the range of influence of the high pressure of the lead wire cut portion 14 is large, so that the insulation distance between the electric components is increased and the mounting density of the electric components is increased. In the case of the present invention, since the lead wire cut portion 14 does not occur in the case of the present invention, the insulation distance between the electrical components can be reduced to improve the mounting density of the electrical components.

The top view of the lighting fixture which concerns on 1st Embodiment of this invention. The right view of the lighting fixture shown in FIG. The front view of the lighting fixture shown in FIG. The front view of the lighting fixture which concerns on 5th Embodiment of this invention. The perspective view which shows the other example of the reflecting plate shown in FIG. The electronic circuit diagram of the inverter of the lighting fixture shown in FIG. The surface side perspective view of the inverter shown in FIG. The back side perspective view of the inverter shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A ... Lighting fixture, 2 ... Main body case, 2a ... Lamp accommodating part, 3a, 3b ... A pair of end cover part, 4 ... Cold cathode fluorescent lamp, 5 ... Lighting circuit accommodating part.

Claims (4)

A substantially flat instrument body having means for attaching to the surface to be attached;
In rated lighting, a positive column wall load is 0.05 or more and 0.2 [W / cm ² ] or less, a lamp voltage is 300 or more and less than 1000 [V], and a plurality of cold cathodes arranged in parallel on the instrument body With fluorescent lamps;
A lighting circuit disposed on the appliance body and provided with an input terminal portion of a commercial power line;
The lighting fixture characterized by comprising. ^2. The lighting apparatus according to claim 1, wherein the cold cathode fluorescent lamp has a tube wall load of 0.05 to 0.15 [W / cm ² ] in rated lighting. The lighting apparatus according to claim 1 or 2, wherein the cold cathode fluorescent lamp has a ratio [Wp / W _L ] of positive column power Wp to lamp power W of 0.8 or more and less than 1.   The cold cathode fluorescent lamp has a lamp current of 3 to 10 mA, a tube inner diameter of 2 to 4 [mm] and a lamp length of 300 to 700 [mm] in rated lighting. 4. The lighting fixture according to any one of 3.

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