JP2022153788A - Illuminating device - Google Patents

Abstract

To provide an illuminating device enabling radiation of noise to be suppressed.SOLUTION: An illuminating device 10 comprises a metallic housing 11 having an irradiation opening 27 in a front surface portion 20. An electric discharge tube 31 is arranged opposite the irradiation opening 27 and in the metallic housing 11. A pair of external electrodes 32 are arranged on the back side of the electric discharge tube 31 inside the metallic housing 11. Each of a pair of terminals 41 has a contact portion 48 connected electrically to an external electrode 32, and a terminal portion 47 arranged in parallel with the external electrode 32, and is arranged in the metallic housing 11. A drive circuit is arranged in the metallic housing 11 and applies a pulse voltage between a pair of external electrodes 32 through the pair of terminals 41. In front view of the metallic housing 11, the distance between a terminal portion 47 and an external terminal 32 each having the same potential is smaller than the distance L1 between the pair of external electrodes 32.SELECTED DRAWING: Figure 5

Description

An embodiment of the present invention relates to a lighting device using an external electrode type discharge tube.

Conventionally, a pair of external electrodes are arranged outside the discharge tube, and a pulse voltage is applied between the pair of external electrodes from a drive circuit to generate discharge within the discharge tube and emit light.

In a lighting device using such a discharge tube, the terminal that electrically connects the external electrode and the drive circuit and the wiring loop formed by the electric wire serve as an antenna, and noise is likely to be radiated to the outside when the pulse voltage is applied. . Therefore, discharge tubes, external electrodes, driving circuits, and the like are often housed in a metal housing to suppress noise radiation to the outside.

However, the metal housing requires an irradiation opening for irradiating light to the outside, and noise is radiated from this irradiation opening.

Japanese Patent Application Publication No. 2014-508612

A problem to be solved by the present invention is to provide a lighting device capable of suppressing noise emission.

A lighting device according to an embodiment includes a metal housing having an irradiation opening in a front portion thereof. A discharge tube is positioned within the metal housing opposite the illumination aperture. A pair of external electrodes are disposed on the back side of the discharge tube within the metal housing. A pair of terminals has a contact portion electrically connected to the external electrode and a terminal portion arranged in parallel with the external electrode, and is arranged in the metal housing. A drive circuit is arranged in the metal housing and applies a pulse voltage between the pair of external electrodes through the pair of terminals. When viewed from the front of the metal housing, the distance between the terminal portion and the external electrode having the same potential is smaller than the distance between the pair of external electrodes.

According to the illumination device of the embodiment, suppression of noise radiation can be expected.

1 is a perspective view of a lighting device showing a first embodiment; FIG. Fig. 2 is an exploded perspective view of the lighting device; Fig. 3 is a perspective view of a wiring structure of a discharge tube, external electrodes and sockets of the lighting device; Fig. 2 is a front view showing the positional relationship among the irradiation aperture, the discharge tube, the external electrode, and the wiring structure of the socket of the lighting device; FIG. 4 is a cross-sectional view showing the positional relationship among the metal housing, the discharge tube, the external electrode, and the wiring structure of the socket of the same lighting device. FIG. 8 is a perspective view of a wiring structure of a discharge tube, external electrodes, and sockets of a lighting device showing a second embodiment; Fig. 2 is a front view showing the positional relationship among the irradiation aperture, the discharge tube, the external electrode, and the wiring structure of the socket of the lighting device; FIG. 4 is a cross-sectional view showing the positional relationship among the metal housing, the discharge tube, the external electrode, and the wiring structure of the socket of the same lighting device.

A first embodiment will be described below with reference to FIGS. 1 to 5. FIG.

A lighting device 10 is shown in FIGS. The lighting device 10 is installed, for example, on a ceiling surface, a wall surface, or the like using a separate mounting device, or is placed and installed at a predetermined installation location.

The lighting device 10 includes a metal housing 11 , and a light source unit 12 , a socket 13 and a drive circuit 14 arranged in the metal housing 11 .

The metal housing 11 is provided in a substantially rectangular parallelepiped shape. The metal housing 11 includes a substantially rectangular front portion 20, a rear portion 21 on the opposite side of the front portion 20, left and right side portions 22, and upper and lower side portions intersecting with the left and right side portions 22. 23.

The metal housing 11 includes a body portion 24 having an open front side and a front cover portion 25 detachably attached to the front side of the body portion 24 . The body portion 24 and the front cover portion 25 are each made of a metal material such as aluminum. The main body portion 24 includes a rear portion 21, left and right side portions 22, and upper and lower side portions 23, respectively. 23 front side. The front cover portion 25 is detachably attached to the body portion 24 by screws 26 inserted through the side portions 22 on both left and right sides of the body portion 24 while being fitted to the front side of the body portion 24 .

The front surface portion 20 of the front cover portion 25 has a substantially rectangular irradiation opening 27 formed in the central region thereof. A plurality of holes 28 are provided on the sides of the irradiation opening 27 of the front surface portion 20 of the front cover portion 25 so that a sensor such as a human sensor and a display unit for displaying the operation status are respectively exposed.

The light source unit 12 includes a light source case 30, a plurality of discharge tubes 31 and a pair of external electrodes 32 accommodated in the light source case 30, and a pair of light source terminals 33 arranged on the back side of the light source case 30. It has

The light source case 30 is made of, for example, resin, has insulating properties, and is formed in a substantially rectangular box shape with a small thickness in the front-rear direction. A substantially rectangular window portion 34 through which the light from the discharge tube 31 is emitted is opened in the central region of the front side of the light source case 30 . The window part 34 is arranged to face the irradiation opening 27 of the metal housing 11 while the light source unit 12 is assembled in the metal housing 11 . The window portion 34 is formed to have a size equal to or slightly smaller than the irradiation opening 27 of the metal housing 11 when viewed from the front (front view) of the front surface portion 20 of the metal housing 11 . there is

For example, a discharge lamp, an excimer lamp, or the like that emits light is used as the discharge tube 31 . The discharge tube 31 is a cylindrical glass tube filled with a predetermined discharge gas, a discharge substance, or the like, and a pulse voltage applied between a pair of external electrodes 32 causes, for example, a dielectric barrier discharge to emit light. do. The light emitted from the discharge tube 31 can emit desired light such as visible light or ultraviolet light depending on the type of the enclosure. The plurality of discharge tubes 31 are disposed in the light source case 30 in parallel with each other with the longitudinal axis thereof being horizontal, facing the window 34 in parallel with each other and vertically spaced apart from each other. It is

The pair of external electrodes 32 are conductive, elongated in the vertical direction, and relatively wide in the horizontal direction. A plurality of recesses 35 in which the discharge tubes 31 are respectively arranged are formed on the front side of the pair of external electrodes 32 . The pair of external electrodes 32 are arranged with a predetermined gap in the axial direction of the discharge tube 31 . The pair of external electrodes 32 are arranged to face the irradiation opening 27 of the metal housing 11 via the plurality of discharge tubes 31 in a state in which the light source unit 12 is incorporated in the metal housing 11 . As shown in FIG. 4 (FIG. 4 is a front view showing the positional relationship between the irradiation aperture 27, the discharge tube 31, the external electrode 32, and the wiring structure of the socket 13), the pair of external electrodes 32 are shown above and below in a front view. There is a gap between both ends of the direction and the vertical edge of the irradiation aperture 27, and there is a gap between the lateral outer part of the pair of external electrodes 32 and the lateral edge of the irradiation aperture 27. . These gaps may be reduced or eliminated by changing at least one of the shape of the metal housing 11 and the shape of the irradiation aperture 27 .

A pair of light source terminals 33 are shown in FIGS. 3 is a perspective view of the wiring structure of the discharge tube 31, the external electrode 32, and the socket 13, and FIG. FIG. 5 is a front view, and FIG. 5 is a sectional view showing the positional relationship among the metal housing 11, the discharge tube 31, the external electrode 32, and the wiring structure of the socket 13. As shown in FIG.

The pair of light source terminals 33 is a terminal plate having conductivity, and is elongated in the vertical direction. The pair of light source terminals 33 has mounting portions 36 and connection portions 37 provided at the upper and lower ends of the mounting portions 36 . The upper and lower connecting portions 37 are bent so as to protrude from the mounting portion 36 toward the rear side and protrude outward. The pair of light source terminals 33 are positioned on the back side of the light source case 30 and on the back side of the external electrodes 32 in the light source case 30 along the vertical direction. It is inserted and screwed to the external electrode 32 . A pair of light source terminals 33 are electrically connected to a pair of external electrodes 32 through a plurality of screws 38, respectively. The light source terminal 33 is covered with an insulating light source terminal cover except for the connection portion 37 . The light source terminal cover is detachably attached to the socket 13 .

2 to 5, the socket 13 is electrically connected to a socket body 40 (see FIG. 2) to which the light source unit 12 is detachably attached and the pair of light source terminals 33 of the light source unit 12, respectively. A pair of terminals 41 to be connected, a pair of wires 42 electrically connected to the pair of terminals 41, and a connector 43 to which the pair of wires 42 are electrically connected are provided.

The socket main body 40 is made of resin, for example, and has insulating properties. A pair of mounting grooves 45 are provided in the socket main body 40 along the vertical direction while communicating downward. The light source unit 12 is positioned in the front-rear direction by fitting the pair of light source terminals 33 and the light source terminal cover into the pair of mounting grooves 45 from below the socket body 40, and is slid upward to a predetermined position. is detachably attached to the mounting position of the

The pair of terminals 41 are attached to the back side of the socket body 40 and arranged behind the pair of mounting grooves 45 of the socket body 40 . The pair of terminals 41 is a terminal plate having conductivity, and is elongated in the vertical direction. The pair of terminals 41 includes a terminal portion 47 elongated in the vertical direction, contact portions 48 provided at the upper and lower ends of the terminal portion 47, and the wiring 42 provided at the side portion of the terminal portion 47 mechanically and electrically. It has a wiring connection portion 49 for connection. Although the pair of terminals 41 further has mounting portions 50 projecting from the side portions of the terminal portions 47 for mounting to the socket body 40, the mounting portions 50 are not limited to such a configuration. The amount of protrusion from portion 47 may be reduced, or another structure may be used.

When the light source unit 12 is attached to the socket body 40 , the terminal portions 47 of the pair of terminals 41 are arranged in parallel with the pair of external electrodes 32 , and the upper and lower contact portions 48 are connected to the connection portions 37 of the pair of light source terminals 33 . and are electrically connected to each other. That is, the contact portion 48 is electrically connected to the external electrode 32 through the light source terminal 33 . The contact portion 48 is bent so as to protrude forward from the terminal portion 47 , and allows the light source terminal 33 of the light source unit 12 , which is slidably mounted on the socket body 40 from below, to be detachable and mounted on the socket body 40 . The light source terminal 33 of the light source unit 12 is press-contacted to ensure electrical connection.

The pair of wirings 42 use covered electric wires obtained by covering the periphery of conductive wires with a covering material. One end sides of the pair of wires 42 are fixed to the wire connection portions 49 of the pair of terminals 41 by, for example, crimping, and are electrically connected. The other ends of the pair of wirings 42 are electrically connected to the connector 43 . The pair of wires 42 has one end side arranged substantially parallel to the terminal portion 47 of the pair of terminals 41 , and an intermediate portion bent toward the rearward connector 43 on the lower side of the socket body 40 .

The connector 43 is electrically connected to the pair of wirings 42 and is detachably connected to the drive circuit 14 .

As shown in FIGS. 4 and 5, with the light source unit 12 mounted in the metal housing 11, the pair of terminals 41 and the pair of wires 42 of the socket 13 correspond to the pair of external electrodes when viewed from the front. 32 in a hidden position. That is, since the pair of terminals 41 and the pair of wirings 42 are positioned in the rear-side region of the external electrodes 32 having the same potential when viewed from the front, the distance between the terminals 41 and the external electrodes 32 having the same potential is 0. and is smaller than the distance L1 between the pair of external electrodes 32 .

Furthermore, the terminal portion 47 of the terminal 41 is such that the distances L2 and L3 between the inner surface sides of the front surface portion 20 and the side surface portions 22 and 23 of the metal housing 11 are equal to the distances (0 is larger than ). One end side of the wiring 42 having the same positional relationship as the terminal portion 47 also has the same positional relationship.

Further, as shown in FIG. 2, the drive circuit 14 is arranged on the back side of the socket 13 inside the main body portion 24 . The drive circuit 14 has a substrate 60 and a plurality of electronic components 61 mounted on this substrate 60 . A connector 62 to which the connector 43 of the socket 13 is detachably electrically connected is mounted on the board 60 . The drive circuit 14 converts, for example, AC power from a commercial AC power supply into a pulse voltage of a predetermined frequency, applies this pulse voltage from the socket 13 to the pair of external electrodes 32 of the light source unit 12, and in each discharge tube 31 A discharge is generated to radiate light. The pulse voltage applied from the drive circuit 14 to the pair of external electrodes 32 varies depending on the discharge tube 31, and may be a high frequency of 6 kV, for example.

In the illumination device 10 configured as described above, when a pulse voltage is applied to the pair of external electrodes 32 by the driving circuit 14, a discharge is generated in each discharge tube 31 and light is emitted. The light emitted from 31 is irradiated to the outside through the irradiation opening 27 of the metal housing 11 .

By the way, in the illumination device 10 using the discharge tube 31, the wiring loop formed by the terminal 41 and the wiring 42 electrically connecting the external electrode 32 and the driving circuit 14 becomes an antenna. Easy to emit noise. The discharge tube 31, the external electrode 32, the driving circuit 14, and the like are housed in the metal housing 11. Since the metal housing 11 is provided with an irradiation opening 27 for irradiating light to the outside, this Noise is likely to be radiated from the irradiation aperture 27 to the outside.

Noise is most likely to be generated from the pair of external electrodes 32 at different potentials, but it is also generated from the terminal portion 47 of the terminal 41 at the same potential or the wiring loop formed between the wiring 42 and the external electrode 32. Furthermore, it is also generated from between the terminal 41 on the high potential side and the inner surface of the metal housing 11 at the ground potential, for example, and radiated to the outside from the irradiation opening 27 of the metal housing 11 .

In the lighting device 10 of the first embodiment, the pair of terminals 41 and the pair of wirings 42 have a distance of 0 from the external electrodes 32 having the same potential when viewed from the front. Since the distance L1 between the external electrodes 32 is smaller than the distance L1 between the external electrodes 32, the wiring loop that serves as an antenna for noise radiation between the external electrodes 32 having the same potential can be made small, and noise generation can be suppressed. Radiated noise can be reduced.

Moreover, since the pair of terminals 41 and the pair of wirings 42 are arranged in a position hidden in the back side region of the pair of external electrodes 32 when viewed from the front, the noise radiated to the outside from the irradiation aperture 27 is further reduced. can.

Furthermore, since the pair of terminals 41 and the pair of wirings 42 are positioned in the back side region of the external electrodes 32 having the same potential as viewed from the front, stray capacitance is generated between the wirings 42 and the external electrodes 32 . can be suppressed. If the wires 42 with different potentials were arranged on the back side of the external electrodes 32, stray capacitance would occur between the wires 42 and the external electrodes 32, and the peak value of the pulse-like lamp driving waveform would be attenuated. , the luminous efficiency may be lowered. On the other hand, since the pair of terminals 41 and the pair of wirings 42 are positioned in the back side region of the external electrodes 32 having the same potential when viewed from the front, the generation of stray capacitance can be suppressed, and the luminous efficiency can be improved. can be prevented from decreasing.

Further, the terminal portion 47 of the terminal 41 is such that the distances L2 and L3 between the inner surface sides of the front surface portion 20 and the side surface portions 22 and 23 of the metal housing 11 are equal to the distances (0 ), the noise generated between the terminal 41 on the high potential side and the inner surface of the metal casing 11 at the ground potential, for example, is reduced, and the noise is prevented from being radiated to the outside. can be reduced. Regarding this point, the same effect as that of the terminal portion 47 can be expected for the one end side of the wiring 42 having the same positional relationship as the terminal portion 47 .

Next, FIGS. 6 to 8 show a second embodiment. Note that the same reference numerals are used for the same configurations as in the first embodiment, and the description thereof is omitted. 6 is a perspective view of the wiring structure of the discharge tube 31, the external electrode 32 and the socket 13, and FIG. FIG. 8 is a front view, and FIG. 8 is a sectional view showing the positional relationship among the metal housing 11, the discharge tube 31, the external electrode 32, and the wiring structure of the socket 13. As shown in FIG.

The configuration of the terminals 41 of the socket 13 and the positions of the terminals 41 and the wirings 42 are different from the first embodiment.

The pair of terminals 41 is a conductive terminal plate, elongated in the vertical direction, combined with a terminal cover, and attached to the back side of the socket body 40 by the terminal cover.

The pair of terminals 41 has a vertically long terminal portion 47 , a contact portion 48 provided at the upper end of the terminal portion 47 , and a wiring connection portion 49 provided at the lower end of the terminal portion 47 .

The terminal portions 47 of the pair of terminals 41 are arranged in parallel with the pair of external electrodes 32 when the light source unit 12 is attached to the socket body 40 .

The contact portions 48 of the pair of terminals 41 are arranged on the upper side of the pair of mounting grooves 45 of the socket body 40, and when the light source unit 12 is mounted on the socket body 40, the connection portions of the pair of light source terminals 33 are connected. 37 are contacted and electrically connected. The contact portion 48 includes a bent portion 70 bent in a substantially L shape from the upper end of the terminal portion 47, a pair of facing portions 71 bent from both sides of the tip portion of the bent portion 70 so as to face each other, The contact portions 72 are bent in opposite directions from both sides of the facing portions 71 . The connecting portion 37 of the light source terminal 33 is inserted from below between the contact portions 72 of the pair of facing portions 71 to be electrically connected. The contact portion 48 is electrically connected to the external electrode 32 through the light source terminal 33 .

The wiring connection portion 49 of the pair of terminals 41 has a locking terminal structure, mechanically locking and electrically connecting the inserted wiring 42 .

One end sides of the pair of wirings 42 are inserted into the wiring connection portions 49 of the pair of terminals 41 to be locked and electrically connected. The other ends of the pair of wirings 42 are electrically connected to the connector 43 . One end of the pair of wires 42 is arranged substantially linearly with the terminal portion 47 of the pair of terminals 41 , and the intermediate portion thereof is bent toward the rear connector 43 on the lower side of the socket body 40 .

7 and 8, when the light source unit 12 is mounted in the metal housing 11, the terminal portion 47 and the wiring connection portion 49 of the pair of terminals 41 and one end side of the wiring 42 are connected to the front surface. It is arranged on the rear surface side of the front surface portion 20 of the metal housing 11 outside the irradiation aperture 27 when viewed. Only the contact portions 48 of the pair of terminals 41 are arranged inside the irradiation opening 27 for electrical connection with the light source terminal 33, but at least a part of the contact portions 48 is located within the rear side region of the external electrode 32. It is arranged to hide in the

The terminal portions 47 of the pair of terminals 41 are arranged such that the distance L4 between them and the external electrodes 32 having the same potential is smaller than the distance L1 between the pair of external electrodes 32 when viewed from the front.

Furthermore, the terminal portion 47 of the terminal 41 is such that the distances L2 and L3 between the front portion 20 and the inner surfaces of the side portions 22 and 23 of the metal housing 11 are equal to the terminal portion 47 of the terminal 41 and the external electrode 32. are arranged so as to have a larger relationship than the distance L4 between the

Furthermore, when viewed from the front, the distance L5 between the edge of the irradiation aperture 27 and the external electrode 32 facing the edge of the irradiation aperture 27 is equal to the distance L4 between the terminal portion 47 and the external electrode 32 having the same potential. It is related to less than

In the illumination device 10 of the second embodiment, the distance L4 between the terminal portions 47 of the pair of terminals 41 and the external electrodes 32 having the same potential is the distance L1 between the pair of external electrodes 32 when viewed from the front. , the wiring loop serving as an antenna for noise radiation between the external electrodes 32 of the same potential can be made small to suppress the generation of noise, and the noise radiated to the outside from the irradiation aperture 27 can be reduced. be able to.

Furthermore, the terminal portion 47 of the pair of terminals 41, the wiring connection portion 49, and one end side of the wiring 42 are arranged on the rear surface side of the front surface portion 20 of the metal housing 11 outside the irradiation opening 27 when viewed from the front. , is shielded by the metal housing 11, and the radiation of noise to the outside from the irradiation aperture 27 can be reduced.

Furthermore, the terminal portion 47 of the terminal 41 is such that the distances L2 and L3 between the front portion 20 and the inner surface sides of the side portions 22 and 23 of the metal housing 11 are equal to the terminal portion 47 and the external electrode 32, respectively. is greater than the distance L4 of , it reduces the generation of noise from between the terminal 41 on the high potential side and the inner surface of the metal casing 11 at the ground potential, for example, and reduces the radiation of the noise to the outside. can. Regarding this point, the same effect as that of the terminal portion 47 can be expected for the one end side of the wiring 42 having the same positional relationship as the terminal portion 47 .

Furthermore, when viewed from the front, the distance L5 between the edge of the irradiation aperture 27 and the external electrode 32 facing the edge of the irradiation aperture 27 is equal to the distance L4 between the terminal portion 47 and the external electrode 32 having the same potential. , the noise radiated to the outside from between the irradiation aperture 27 and the external electrode 32 can be reduced.

In the second embodiment, as shown in FIG. 7, the terminal portion 47 of the pair of terminals 41, the wiring connection portion 49, and one end side of the wiring 42 are located outside the irradiation aperture 27 in a front view of the metal housing. Although arranged on the rear side of the front portion 20 of the body 11, only the pair of terminals 41 may be arranged in the rear side region of the pair of external terminals 32 as shown in FIG. Also, it is possible to suppress the generation of noise by reducing the wiring loop serving as an antenna for noise radiation, and to reduce the noise radiated to the outside from the irradiation aperture 27 .

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

REFERENCE SIGNS LIST 10 lighting device 11 metal housing 14 drive circuit 20 front surface 27 irradiation opening 31 discharge tube 32 external electrode 41 terminal 47 terminal portion 48 contact portion

Claims (5)

a metal housing having an irradiation aperture in the front;
a discharge tube disposed within the metal housing facing the irradiation aperture;
a pair of external electrodes arranged on the back side of the discharge tube within the metal housing;
It has a contact portion electrically connected to the external electrode and a terminal portion arranged in parallel with the external electrode. a pair of terminals in which the distance between the terminal portion of electric potential and the external electrode is smaller than the distance between the pair of external electrodes;
a driving circuit disposed in the metal housing and applying a pulse voltage between the pair of external electrodes through the pair of terminals;
A lighting device comprising: 2. The lighting device according to claim 1, wherein the distance between the terminal and the inner surface of the metal housing is greater than the distance between the terminal and the external electrode, which have the same potential. 3. The lighting device according to claim 1, wherein the terminal is arranged in a rear side area of the external electrode when viewed from the front of the metal housing. 3. The terminal part of the terminal is arranged on the rear surface side of the front part of the metal housing outside the irradiation opening when viewed from the front of the metal housing. lighting system. When viewed from the front of the metal housing, the distance between the edge of the irradiation opening and the external electrode facing the edge of the irradiation opening is the distance between the terminal portion and the external electrode having the same potential. 5. The lighting device of claim 4, wherein the lighting device is smaller than .

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