JPH04329253A - Tube type incandescent lamp - Google Patents

Abstract

PURPOSE:To provide tube type incandescent lamp, of which power saving effect is enlarged in the case of dimming. CONSTITUTION:In a tube type incandescent lamp, in which multiple light emitting parts 3 and non-light-emitting parts 4 are located each other along the tube axial direction inside of a valve 1, the described light emitting parts 3 are connected in series every one to form two series circuits 25, 26 inside of the valve 1. Any one of the case that these two series circuits are lightened simultaneously and that only one series circuit is lightened is selected.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to incandescent light bulbs such as infrared light bulbs and halogen light bulbs used as light sources for copying machines.

0002

2. Description of the Related Art Conventionally, a tubular halogen light bulb used as a light source for illuminating a document in a copying machine, for example, is shown in FIG. 2(a).
As shown in the figure, a filament mount 2 is provided in a straight tube-shaped bulb 1 made of quartz or the like along the tube axis direction.

[0003] The filament mount 2 has light emitting parts 3 made of filament coils and non-light emitting parts 4 made of shorting wires etc. arranged alternately in order to equalize the illumination distribution along the tube axis direction.

As shown in FIG. 2(b), the non-light emitting part 4 is constructed by winding ring supports 6 around both ends of a shorting wire 5 made of a twisted conductive wire such as tungsten. The ends of the filament coil that will become the light emitting part 3 are connected to both ends of the wire 5, and the ring support 6 is in contact with the inner surface of the bulb 1, so that the filament coil that will become the light emitting part 3 is connected to the tube of the bulb. It is designed to be held on the shaft.

As shown in FIG. 3, another conventional non-light-emitting portion 4 is formed by bending and forming both ends of a wire 7 made of molybdenum or the like to form ring supports 8, and forming ring supports 8 at the ends of these ring supports 8. By connecting the ends of the filament coils that will become the light emitting part 3 to the ring supports 8 and bringing the ring supports 8 into contact with the inner surface of the bulb 1, the light emitting part 3 is held on the tube axis of the bulb. In either structure, the light-emitting parts 3 and non-light-emitting parts 4 are alternately located, and the whole is connected in series to electrically constitute one series circuit. In addition, in (a) of FIG. 2, 10 is a crushing sealing part, 1
1 is a metal foil conductor, and 12 is an external lead wire.

[0006] Reference numeral 13 is a cap joined to the crushing sealing portion 11, and only one end is shown. The base 13 is made of an insulating material such as ceramics, and the external lead wire 12 is welded to the power supply line 14 inside the base 13. In other words, the external lead wire 12 and the power supply line 1 are welded to each other.
4 is covered by a cap 13, and this cap 13 is joined to the crush sealing portion 11 of the valve 1 with an adhesive (cement) 15.

By the way, recent copying machines have been developed that have been provided with a color copying function in addition to black and white copying, thereby expanding the range of use. This kind of copying machine can print black and white/
When using different colors, it is necessary to vary the amount of light emitted from the light source. When the above tube-shaped incandescent (halogen) light bulb is used as a shared black-and-white/color light source, it is necessary to change the amount of light emitted depending on the mode of use.

[0008] When performing such dimming, a means is employed to adjust the power supplied to the lamp. In other words, in the dimming, the amount of light emitted from the filament coil is changed by changing the voltage applied to the lamp.

[0009]

[Problems to be Solved by the Invention] However, when controlling the light by adjusting the voltage supplied to the light bulb as described above, the rate of change in power consumption is small compared to the rate of change in light intensity, and for example, it is difficult to change the light intensity from 100%. If you want to reduce power consumption to 50%, you can only reduce power consumption by about 75% from 100%.
This is an inefficient usage.

[0010] This is because a part of the electric power supplied to the light bulb is wasted as heat in the non-light emitting part 4, and this wasted amount is a substantially constant amount regardless of the magnitude of the supplied electric power. This is because even if the voltage is lowered to adjust the amount of light, the amount of waste will not be reduced. The present invention has been made based on the above circumstances, and an object thereof is to provide a tube-shaped incandescent light bulb that has a large power saving effect when dimming.

[0011]

[Means for Solving the Problems] A first aspect of the present invention is a tube-type incandescent light bulb in which a plurality of light-emitting parts and non-light-emitting parts are arranged alternately along the tube axis inside the bulb, wherein the light-emitting part is one By connecting every other series in series, two series circuits are formed within the bulb, and it is possible to select whether to light up these two series circuits at the same time or to light only one series circuit. It is characterized by

The second aspect of the present invention is a tube-type incandescent light bulb in which a plurality of light-emitting parts and non-light-emitting parts are arranged alternately along the tube axis inside the bulb, and the non-light-emitting parts are made of an insulated wire. Two conductive wires electrically insulated from each other are wound, one conductive wire forms a ring support at one end and a filament connection at the other end, and the other conductive wire has one end adjacent to the other conductive wire. A filament connecting part connects the filaments of the light emitting part, and a ring support is formed at the other end, and each of the filament connecting parts connects adjacent filaments, and the ring supports facing each other in the adjacent non-light emitting part Connect electrically to
It is characterized by forming two circuits in which every other light emitting part is connected in series.

[0013]

[Operation] According to the first aspect of the present invention, every other light emitting part is connected in series to form two series circuits within the bulb. It is possible to select whether to turn on only the series circuit of , and by selecting these to turn on, dimming becomes possible. In this case, the power supplied when lighting only one series circuit is approximately half that when lighting two series circuits simultaneously, which is effective in saving power.

According to the second aspect of the present invention, the non-light-emitting portion is formed by winding two electrically insulated conductive wires around an insulated wire, and one of the conductive wires has a ring support at one end. and a filament connection at the other end, and the other conductive wire has one end forming a filament connection connected to another filament coil and a ring support at the other end, so that the bulb It is possible to easily form two series circuits in which every other light emitting section is connected in series.

[0015]

[Embodiment] The present invention will be explained below based on an embodiment shown in FIG. FIG. 1A shows the circuit structure of a straight tube halogen light bulb, where 1 is a bulb, 2 is a filament mount, 3 is a light emitting part, and 4 is a non-light emitting part. As shown in FIG. 3, the light emitting section is formed of a filament coil made of tungsten.

The non-light-emitting portion 4 is shown as a single unit in FIGS. 1(b) and 1(c), in which numeral 20 is an insulating rod made of a heat-resistant insulator such as ceramics, and the cross section is It is circular and polygonal. Two conductive wires 21 and 22 made of tungsten or molybdenum are wound around the insulating rod 20 in a helical shape while being electrically insulated from each other.

One end of the conductive wire 21 is bent into a ring shape to form a ring support 21a, and
The other end extends along the central axis of the insulating rod 20 to form a filament connection portion 21b.

The other conductive wire 22 has one end extended along the central axis of the insulating rod 20 to form a filament connection part 22b, and the other end bent into a ring shape to form a ring support 22a. has been formed.

Therefore, this non-light emitting part 4 has ring supports 21a and 22a which are electrically insulated from each other at both ends of the insulating rod 20.
1a and 22a are adapted to contact the inner surface of the valve 1.

Such a non-light-emitting portion 4 is used as shown in FIG. 1(d). That is, each filament coil constituting the adjacent light emitting section 3 is connected to the filament connecting sections 21b, 22b of the two conductive wires 21, 22 wound around the insulating rod 20, which are oriented in opposite directions.

In this way, the mount 2 is constructed by connecting the light-emitting parts 3 and the non-light-emitting parts 4 alternately along the tube axis direction, but in this case, the adjacent non-light-emitting parts 4, 4 are The connecting wire 23 connects the opposing ring supports 21a and 22a.
to make an electrical connection.

With this configuration, the light emitting section 3 in the bulb 1, that is, the filament coils, are not connected to each other by adjacent filaments, but every other filament coil is connected in series, and inside the bulb, as shown in FIG. a) As shown in the figure, two series circuits 25 and 26 are formed.

In such a configuration, when the two series circuits 25 and 26 are connected to the power source at the same time and turned on, all the filament coils 3 . . . emit light, so that the amount of light becomes 100%.

Furthermore, when either one of the series circuits 25 or 26 is connected to a power source and turned on, every other filament coil 3 emits light, and all the filament coils 3
If the number of filament coils 3 is an even number, exactly half of the filament coils 3 will emit light, so the amount of light will be approximately 50%.

In this case, the remaining series circuit 25 or 26
Since no voltage is applied to the inverter, the amount of power supplied can be reduced accordingly. In other words, for 100% light intensity, 10
Assuming that 0% voltage is supplied, if one of the series circuits 25 or 26 is used to halve the amount of light (50%), the supplied power can be reduced to nearly 50%. The reason why the power supply cannot be reduced to 50% is because
In one series circuit 25 or 26, a conductive wire 21,
This is because there are non-light emitting parts such as 22 and connection wires 23, which generate heat and consume energy, but there is less waste than in the past, so power can be saved.

The structure of the non-light emitting part 4 is such that two conductive wires 21 and 22 are wound around one insulating rod 20 made of ceramics or the like, and a ring is attached to one end of each of these conductive wires 21 and 22. Since the supports 21a and 22a are formed, the two circuits 25 and 26 can be easily formed, and the filament coil 3 can be well held on the tube axis. Note that FIG. 4 shows a new structure of the cap, and although it is not directly related to the present invention, it will be explained below.

In the case of the conventional cap 13, as shown in FIG. 2(a), the power supply line 14 is drawn out along the axial direction of the bulb 1, so that the lamp length becomes long. Modern equipment is required to be smaller, so we want to shorten the lamp length. In the case of the cap 40 shown in FIG. 4, the power supply line 14 is drawn out in a direction crossing the axial direction of the bulb 1.

That is, the cap 40 made of an insulator such as ceramics has a hollow cylindrical shape with one end open, and a small diameter stepped portion 41 is formed at the other end. A fitting groove 42 into which the crushing sealing part 10 of the valve 1 fits is formed in one end opening of the cap 40. The depth of this fitting groove 42 is deeper on the other side 42b than on the one side 42a,
The feeder line 14 is drawn out from this deeper groove opening 42b. That is, the feeder line 14 is connected to the base 40
It is welded perpendicularly to the external lead wire 12 in the hollow portion, and this power supply wire 14 is led out from the deep groove opening 42b of the base 40 in a direction intersecting the bulb 1. The shallower groove opening in the cap 40 is the crush sealing part 10
The hollow part is not visible in contact with or in close proximity to the end face of the

[0029] Adhesive (cement) is applied to the hollow part of the cap 40.
15, and this cement 15 joins the base 40 to the crush sealing part 10, and also presses the joint between the external lead wire 12 and the power supply line 14.

A small hole 43 communicating with the internal hollow portion is formed in the end face of the small diameter stepped portion 41 formed at the other end of the cap 40, and this small hole 43 improves air permeability and allows the cement 15 to It is effective in accelerating drying and improving adhesive strength.

Note that the present invention is not limited to a straight tube halogen light bulb, but may be a normal straight tube incandescent light bulb, and may also be applied to a bulb bent into an annular shape, with light emitting parts and non-light emitting parts arranged alternately. It may also be an infrared lamp, for example an infrared light bulb. Further, in the present invention, dimming by selectively switching each series circuit 25, 26 and dimming by voltage adjustment may be used together.

[0032]

Effects of the Invention As explained above, according to the first aspect of the present invention, two series circuits are configured in the bulb, so either these two series circuits can be turned on at the same time, or only one series circuit can be turned on. It is possible to select whether the lights are turned on or not, and dimming is possible by selecting these lights.In this case, the supplied power is changed from lighting only one series circuit to lighting two series circuits at the same time. This is approximately half the amount of electricity that would otherwise be required, which is effective in saving power. In addition, the second aspect of the present invention
According to No. 3, the structure of the non-light emitting part is simple but effective for constructing two systems of series circuits, and the light emitting part can be supported reliably.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, (a) is a circuit diagram of a straight tube halogen light bulb, (b) is a side view of a single non-light-emitting part used in this light bulb, and (c) is a diagram of the circuit configuration of a straight tube halogen light bulb. is its end view, (d
) is a side view of the mount with the filament connected.

FIG. 2 shows a conventional structure, in which (a) is a cross-sectional view of a straight tube halogen light bulb, and (b) is an exploded perspective view of the mount.

FIG. 3 is a side view showing another conventional non-light emitting part.

FIG. 4 shows the structure of the cap, (a) is an exploded perspective view, and (b) is a sectional view of the cap connected to the valve.

[Explanation of symbols]

1... Bulb, 2... Mount, 3... Light emitting part (filament coil), 4... Non-light emitting part, 20... Insulating rod, 21, 2
2... Conductive wire, 21a, 22a... Ring support, 21b
, 22b... filament connection part, 23... connection line, 25,
26...Series circuit.

Claims (2)

[Claims] Claim 1: A tube-type incandescent light bulb in which a plurality of light-emitting parts and non-light-emitting parts are arranged alternately along the tube axis direction within the bulb, wherein every other light-emitting part is connected in series so that the light-emitting parts are connected in series. This tube-shaped incandescent light bulb is characterized in that it forms two series circuits, and it is possible to select whether the two series circuits are to be lit simultaneously or only one of the series circuits is to be lit. 2. A tubular incandescent light bulb in which a plurality of light-emitting parts and non-light-emitting parts are arranged alternately along the tube axis inside the bulb, wherein the non-light-emitting parts are electrically insulated from each other by an insulated wire. Two conductive wires are wound, and one of the conductive wires forms a ring support at one end, and the other end serves as a filament connection part, and the other conductive wire has one end connecting the filaments of adjacent light emitting parts. A ring ring support is formed at the other end as a filament connection part, and adjacent filaments are connected to each filament connection part, and the opposing ring supports of adjacent non-light emitting parts are electrically connected to each other to emit light. A tubular incandescent light bulb characterized by forming two circuits in which every other part is connected in series.