JPH08329704A - Discharge lamp unit and its unit support frame - Google Patents

Abstract

(57) [Abstract] [Purpose] A small discharge lamp with a small diameter and a relatively small amount of heat generation is used to position and support a lamp unit mounted on a printed circuit board that can be applied as a lighting device for various purposes and the lamp unit. Providing a frame. A lamp unit including a discharge lamp, for example, a cold cathode lamp 12 mounted parallel to a long side of a printed circuit board 11, wherein a circuit device 14 for driving the lamp 12 is mounted on a back surface of the circuit board 11. The electrodes 15 having different polarities are formed on the surfaces of the diagonal corners of the substrate 11,
One or more of the long or short sides of the lamp unit substrate 11 is affixed to the frame body having the electrode rail by abutting the electrode 15 thereon, thereby obtaining a surface or linear light source arbitrarily. The configuration that is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp unit in which a discharge lamp is mounted on a printed circuit board and a frame for positioning and supporting the lamp unit.

[0002]

2. Description of the Related Art In recent years, the one used as an illumination device for an optical image reading apparatus such as a facsimile or a copying machine,
There is a fluorescent lamp mounted on a printed circuit board. Explaining the mounting example with reference to FIG. 7, the fluorescent lamp 2 is
On the surface of the rectangular printed board 1 near one long side edge, the electrodes on both ends of the fluorescent lamp 2 are arranged along the long side edge, and the connection terminals are soldered to the conductor circuit of the printed board 1. The lamp socket 3 is attached to the printed circuit board 1 and is attached to the printed circuit board 1.

The printed circuit board 1 has a fluorescent lamp 2 arranged on the surface near one long side edge, and the fluorescent lamp 2 is arranged on the other side of the long side edge.
A circuit device 4 such as an inverter for driving the LED at a high frequency is mounted in parallel with the fluorescent lamp 2 in the longitudinal direction. A connector 5 for connecting to a power source such as a direct current is mounted on the back surface (or front surface) thereof.

Since the fluorescent lamp 2 and the high-frequency circuit device 4 for driving the fluorescent lamp 2 are mounted on one printed circuit board 1 in the thus constructed lighting device, the filament lamp 2 is not preheated sufficiently. Can be prevented or high frequency radiation noise can be reduced.

[0005]

However, the fluorescent lamp 2
Are arranged so as to be biased toward the edge of the printed circuit board 1, the circuit device 4 and the like are arranged on the same surface side where the fluorescent lamps 2 are arranged, and the screw holes 6 formed in the printed circuit board 1.
It is designed to be screwed and fixed to a frame of, for example, a facsimile, and is applied to a special device such as an optical image reading device. Further, the fluorescent lamp 2 is provided with a preheating filament, has a large amount of heat generation, and is relatively large.

The present invention uses a small-sized discharge lamp having a small diameter and a comparatively small amount of heat generation, and a lamp unit mounted on a printed circuit board applicable as a lighting device for various purposes and a frame body for positioning and supporting the lamp unit. The purpose is to provide.

[0007]

The above object of the present invention can be achieved by the following items (1) to (6). (1) A lamp unit including a discharge lamp mounted on the surface of a printed circuit board, wherein electrodes having different polarities are formed on at least one surface near both opposite corners of the board. Discharge lamp unit to do.

(2) A discharge lamp unit equipped with a lamp mounted in parallel with a long side of a rectangular printed circuit board at a central portion thereof, wherein at least one surface of the printed circuit board is in the vicinity of both diagonal corners of the substrate. A discharge lamp unit, characterized in that electrodes having different polarities are formed on each other.

(3) A lamp unit equipped with a discharge lamp mounted parallel to a long side of a rectangular printed circuit board, wherein a circuit device for driving the discharge lamp is provided on the opposite side of the board on which the discharge lamp is mounted. The discharge lamp unit is characterized in that the electrodes are mounted on the surface of the substrate and electrodes having polarities different from each other are formed on at least one surface in the vicinity of opposite corners of the substrate.

(4) A lamp unit having a discharge lamp mounted parallel to a long side of a rectangular printed board, wherein a circuit device for driving the discharge lamp and a DC power supply mount the discharge lamp on the board. Discharge characterized in that electrodes having different polarities are formed on at least one surface in the vicinity of both diagonal corners of the substrate, and the electrodes are connected to the DC power source and have different polarities. Lamp unit.

(5) A frame body having electrode rails for contacting electrodes formed at the corners of a printed circuit board on which the discharge lamp is mounted and supplying electric power to the circuit board, wherein the frame body is of the circuit board. A support frame body for a discharge lamp unit, wherein the support frame body is arranged along opposite edges to position and support one or more of the substrates.

(6) A frame body having electrode rails that are in contact with electrodes formed at the corners of a printed circuit board on which a discharge lamp is mounted and are parallel to the long sides of the rectangular shape and supply electric power to the circuit board. The discharge lamp is characterized in that the frame body is arranged along either long side edges of the substrate facing each other or short side edges of the substrate facing each other, and positions and supports one or more of the substrates. Support frame for the unit.

[0013]

According to the above configuration of the present invention, the printed board is
Since a discharge lamp with low power but high brightness is mounted, a circuit such as a high-frequency power supply that drives the discharge lamp can be mounted on the printed circuit board in the immediate vicinity of the discharge lamp, which minimizes leakage current due to high voltage. It is possible to suppress and reduce high frequency radiation noise due to high voltage, and it is possible to make a small and compact lamp unit.

Further, since electrodes having polarities different from each other are formed at both corners of the substrate facing each other on the substrate, a clip having an electrode that conducts electricity to the substrate from both sides of the substrate facing each other is provided. By sandwiching the substrate, it is possible to support the substrate and to arbitrarily connect a plurality of substrates, that is, a plurality of lamp units electrically and mechanically.

Further, a circuit such as a high frequency power source for driving the lamp and a DC power source are mounted on the substrate, and the DC power source is used as a power source for driving the discharge lamp mounted on its own substrate. By using electrodes having different polarities formed at opposite corners of the substrate as electrodes for supplying direct current to another discharge lamp unit, a discharge lamp for arbitrarily connecting a plurality of discharge lamp units can be provided. The power supply unit may be included.

Furthermore, a frame body for positioning and supporting the substrate and having electrode rails for abutting the electrodes of the substrate is formed in a straight line with an appropriate length, and two frame members are arranged facing each other with a predetermined interval. Then, by mounting the plurality of printed circuit boards on which the discharge lamps are mounted in parallel with the long sides of the rectangular shape on the short side edges of the frame, a surface emitting light source can be obtained. By narrowing the interval between the frame bodies facing each other and mounting the long side edges of the plurality of printed circuit boards, it is possible to obtain an elongated linear light source. As a result, it can be applied as a lighting device for various purposes.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same reference numerals are given to the same portions throughout FIGS. 1 to 6.

FIG. 1 is a schematic perspective view of a discharge lamp unit according to an embodiment of the present invention. Reference numeral 11 is a printed circuit board (hereinafter simply referred to as "substrate") formed of synthetic resin or the like.
Is formed in a long and narrow rectangular shape, and in this embodiment, a so-called cold cathode lamp having no preheating filament is used as the discharge lamp 12, and the discharge lamp 12 is mounted in the central portion of the board 11 in parallel with the long side of the board 11. Has been done.

On the surface of the substrate 11 opposite to the side on which the cold cathode lamp 12 is mounted, an inverter type lighting circuit device 14 for driving the cold cathode lamp 12, such as a high-voltage power supply device at about 40 to 50 KHz, is mounted. An electrode 15 in the vicinity of both diagonal corners of the substrate 11 in which one is positive and the other is negative
Are formed. The electrode 15 has an L shape, and each side of the L shape is formed along each edge at positions equidistant from the short side edge and the long side edge of the substrate 11, respectively.
As shown in FIG. 3, it is formed on both sides of the surface of the substrate 11 facing each other.

The cold cathode lamp 12 has a diameter of about 3 to 6 mm and a length of about 20 cm, and the leads of the electrodes on both ends of the cold cathode lamp 12 may be directly fixed to the substrate 11 with solder or the like. The connection terminal is connected to the lamp socket 13 which is soldered and attached to the conductor circuit of the board 1, and thereby is detachably attached to the printed board 11.

The specific numerical values and the shapes of the electrodes are merely examples, and the present invention is not limited to these. Further, if the discharge lamp is a cold cathode lamp, the lamp unit can be made smaller and more compact, but the discharge lamp is not limited to the cold cathode lamp, and other small discharge lamps can be configured in the same manner as this embodiment. it can.

FIG. 2 is a perspective view of an embodiment of a frame body for positioning and supporting the discharge lamp unit formed as in the above-described embodiment. The frame body 21 is made of a conductive material and has a substantially triangular cross section. Is formed on one side and is opened at one of the apex angles,
Projecting pieces 22 and 23 facing each other are formed in the opening.

The frame body 21 is formed by opposing two pieces formed in a length corresponding to the length and the number of the substrates 11 and fixedly arranged at appropriate places with an interval corresponding to the length and the width of the substrate 11. As shown in FIG. 3, the edge portion of the substrate 11 of the discharge lamp unit is inserted from the opening, and the substrate 11 is sandwiched between the projecting pieces 22 and 23 by the elastic force of the frame 21. As a result, the substrate 11 is positioned and supported.

At this time, both projecting pieces 22, 23 of the frame body 21
Are arranged so as to come into contact with the electrodes 15 formed on the surfaces of the corners of the substrate 11, and voltages of different polarities (one of which may be a ground voltage) are applied to the two frames. As a result, electric power is supplied to the substrate 11 via the projecting pieces 22 and 23 and the electrode 15 of the substrate 11. That is,
In this embodiment, the frame body 21 forms an electrode rail using both projecting pieces 22 and 23 as electrodes. The frame 21 may be formed of an insulator, and the conductors may be formed on the surfaces of the projecting pieces 22 and 23 facing each other. The shape and structure of the frame 21 are also limited to this embodiment. Not a thing.

4 and 5 are views showing an example of a light source constructed by mounting a plurality of the discharge lamp units of the above-mentioned embodiment on the frame body 21 of the above-mentioned embodiment, and FIG. 4 shows two light sources. The short side edges of the substrate 11 are attached to the frame bodies 21 arranged to face each other to form surface emitting light sources, and FIG.
In the same manner, the long side edges of the substrate 11 are attached to each other to form a long and narrow linear light source.

In FIG. 4 and FIG. 5, reference numeral 31
Is a lead member that is mounted across the two frame bodies 11 to apply voltages having different polarities to the respective frame bodies, and 32 is mounted on the lead member 31 and is connected to an external DC power source. Connector. This member 31 does not have to be the end portion of the two frame bodies 21, and need not be one. Alternatively, an AC-DC conversion circuit may be mounted on the lead member 31 to supply an external AC power supply.

By using the frame body 21 of this embodiment, it is possible to set an arbitrary surface, line, size and length, a light source having excellent linearity can be obtained, and further, only the current capacity at the same voltage can be obtained. Although it becomes possible to correspond to each unit by changing, the discharge lamp unit 11 of the above-described embodiment supports the substrate by sandwiching it with another clip or the like having an electrode that conducts electricity on the substrate side, and a plurality of units are provided. The substrate, that is, a plurality of lamp units can be electrically and mechanically connected arbitrarily.

FIG. 6 is a schematic perspective view of a discharge lamp unit according to another embodiment of the present invention, which has the same basic structure as that of the embodiment of FIG. 1 and will be described in detail by giving the same reference numerals to those of FIG. Is omitted. This embodiment is different from the embodiment of FIG. 1 in that the DC power supply circuit 61 is mounted on the substrate 11 and that the electrodes 15 formed in the vicinity of both diagonal corners of the substrate 11 are This is a point that the positive polarity and the other is an electrode that supplies a negative polarity direct current.

The DC power supply circuit 61 is externally provided at an appropriate position on the substrate 11 (a position where any of the long side edge side and the short side edge side of the substrate 11 can be used regardless of whether it is attached to the frame body 21 (FIG. 2)). A connector to be connected to an AC power supply is formed, and when the AC power supply is connected to the connector, the AC power is converted into a DC power supply, which is used as a DC power supply for lighting its own discharge lamp 12, and at the same time the converted DC power is used as an electrode. It can be supplied to another discharge lamp unit via 15.

The discharge lamp unit of the embodiment shown in FIG. 6 can be used alone or in combination, but it is preferable to use it instead of the lead member 31 shown in FIGS. 4 and 5 described above. That is, when the surface emitting light source as shown in FIGS. 4 and 5 or the elongated line emitting light source is used, the frame member 21 is used instead of the lead member 31.
No longer need space to power
In particular, when power is replenished due to lack of current capacity or the like, the light source for surface emission or line emission can be formed without interruption.

In each of the embodiments, all the circuit devices for driving the discharge lamp and the like are mounted on the surface of the substrate opposite to the surface on which the discharge lamp is mounted, to make the discharge lamp unit narrow and compact, and Although it is easy to provide a reflector or the like on the surface on which the discharge lamp is mounted, a part of the circuit device may be mounted on the surface on which the discharge lamp is mounted. Further, the shape of the substrate and the arrangement of the discharge lamp with respect to the surface of the substrate are not limited to the rectangular shape and the central portion thereof, but can be set appropriately, and a plurality of discharge lamps can be provided for one substrate. It is possible.

[0032]

As described above in detail, according to the present invention, since a discharge lamp having a low power but a high brightness is mounted on a printed circuit board, a high frequency power source or the like for driving the lamp is mounted on the printed circuit board. The circuit can be mounted near the lamp,
Thereby, the leakage current due to the high voltage can be minimized, the high frequency radiation noise due to the high voltage can be reduced, and the lamp unit can be made small and compact.

Further, since electrodes having mutually different polarities are formed on both opposite corners of the substrate on the substrate, a clip having an electrode that conducts current to the substrate is sandwiched between both opposite sides of the substrate. Thus, the substrate can be supported, and the plurality of substrates, that is, the plurality of lamp units can be electrically and mechanically arbitrarily connected.

Further, a circuit such as a high-frequency power source for driving the lamp and a DC power source are mounted on the substrate, and the DC power source is used as a power source for driving the discharge lamp mounted on its own substrate. By using electrodes having different polarities formed at opposite corners of the substrate as electrodes for supplying direct current to another discharge lamp unit, a discharge lamp for arbitrarily connecting a plurality of discharge lamp units can be provided. The power supply unit may be included.

Further, a frame body for positioning and supporting the substrate and having electrode rails for abutting the electrodes of the substrate is formed in a linear length, and the two frame bodies are arranged facing each other with a predetermined interval. Then, by mounting the plurality of printed circuit boards on which the discharge lamps are mounted in parallel with the long sides of the rectangular shape on the short side edges of the frame, a surface emitting light source can be obtained. By narrowing the interval between the frame bodies facing each other and mounting the long side edges of the plurality of printed circuit boards, it is possible to obtain an elongated linear light source. As a result, it becomes possible to apply as a lighting device for various purposes.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a discharge lamp unit according to an embodiment of the present invention.

FIG. 2 is a perspective view of a frame body for positioning and supporting the discharge lamp unit according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view for explaining a mounting state of the discharge lamp unit on the frame body of FIG.

FIG. 4 is a plan view showing an example of a surface emitting light source in which a discharge lamp unit is mounted on the frame of FIG.

5 is a plan view showing an example of a line emission light source in which a discharge lamp unit is mounted on the frame of FIG.

FIG. 6 is a schematic perspective view of a discharge lamp unit according to another embodiment of the present invention.

FIG. 7 is a schematic perspective view of a conventional fluorescent lamp unit.

[Explanation of symbols]

 11 Printed Circuit Board 12 Discharge Lamp (Cold Cathode Lamp) 13 Socket 14 Circuit Device 15 Electrode 21 Frame to Mount the Discharge Lamp Unit 22, 23 Projecting Piece (Electrode Rail) 31 Lead Member 32 Connector 61 DC Power Supply

Claims (6)

[Claims] 1. A lamp unit comprising a discharge lamp mounted on the surface of a printed circuit board, wherein electrodes having different polarities are formed on at least one surface near both opposite corners of the board. Characteristic discharge lamp unit. 2. A lamp unit comprising a discharge lamp mounted parallel to a long side of a rectangular printed board at a central portion of the printed board, the lamp unit being provided on at least one surface in the vicinity of both diagonal corners of the board. A discharge lamp unit, wherein electrodes having different polarities are formed. 3. A lamp unit comprising a discharge lamp mounted parallel to a long side of a rectangular printed circuit board, comprising:
A circuit device for driving the discharge lamp is mounted on a surface of the substrate opposite to the surface on which the discharge lamp is mounted, and electrodes having polarities different from each other are formed on at least one surface near diagonal corners of the substrate. A discharge lamp unit characterized by being formed. 4. A lamp unit comprising a discharge lamp mounted parallel to a long side of a rectangular printed board, comprising:
A circuit device for driving the discharge lamp and a DC power source are mounted on a surface of the substrate opposite to the surface on which the discharge lamp is mounted, and the DC power source is provided on at least one surface near diagonal corners of the substrate. A discharge lamp unit, wherein electrodes having different polarities connected to each other are formed. 5. A frame body having electrode rails for contacting electrodes formed at corners of a printed circuit board on which a discharge lamp is mounted and supplying electric power to the circuit board, wherein the frame body is a relative surface of the board. A support frame for a discharge lamp unit, wherein the support frame is arranged along the facing edge and positions and supports one or more of the substrates. 6. An electrode formed on a corner of a printed circuit board on which a discharge lamp is mounted is in parallel contact with a long side of a rectangular shape,
A frame body having electrode rails for supplying electric power to the substrate, wherein the frame body is arranged along either of the long side edges of the substrate facing each other or the short side edges of the substrate facing each other, A support frame for a discharge lamp unit, which positions and supports one or more substrates.