JPH0212673Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a straight tube fluorescent lamp with an improved base structure.

(Prior Art) In general, a straight tube fluorescent lamp has a cap attached to both ends of a straight glass bulb, and a contact fitting, that is, a cap pin, that protrudes in the tube axis direction is provided on the end surface of the cap. is mechanically and electrically connected to the socket on the instrument side via this base pin. However, in a fluorescent lamp equipped with such a cap pin, the length of the lamp increases by the amount of protrusion of the cap pin, which not only increases the size of the device but also shortens the effective light emitting length.

To explain in more detail, FIG. 1 shows an aperture-type straight tube fluorescent lamp used in a copying machine, and this fluorescent lamp has a straight tube glass bulb 1.
A cap 2, 2 is attached to both ends of the cap. At the end faces of these caps 2, 2, cap pins 3 are provided which protrude in the tube axis direction. A phosphor coating 4 is formed on the inner peripheral surface of the glass bulb 1, as shown in cross section in FIG. A coating 5 is formed. The light emitted by the light emission of mercury vapor due to the discharge between the electrodes 6 and 6 is reflected by the reflective coating 5.
, and is irradiated from the slit-shaped window 7 on which the reflective coating 5 is not formed toward the external irradiated surface.

As shown in FIG. 2, the illuminance distribution on the surface to be illuminated by such a fluorescent lamp is such that the relative light output decreases at the end of the tube. Since such a decrease in the relative light output at the tube end limits the effective width of copying, it is required to improve the relative light output at the tube end.

As a countermeasure for this, it is possible to lengthen the pipe length of the valve 1, but the cap pin 3 as shown in Fig. 1...
In the case of a fluorescent lamp having the above-mentioned type, the fixture supporting the lamp becomes large in size, and the entire copying machine also becomes large in size.

On the other hand, if the cap pins 3 are eliminated, the bulb length can be extended by the protruding length of the cap pins 3, and if the overall lamp length L remains the same as before, the effective light emitting length can be increased. In other words, as shown by the imaginary line in FIG. 2, it is possible to improve the relative light output at the tube end.

As an alternative to the cap pins protruding in the tube axis direction, it is conceivable to arrange contact fittings on the outer peripheral surface of an insulating base attached to both ends of the bulb 1. As such, a technique disclosed in Japanese Utility Model Publication No. 36-22239 is already known.

(Problem to be solved by the invention) However, this device has a structure in which the contact fitting is simply fitted onto the outer peripheral surface of the insulating base, and the fixing tongue piece formed at the end is screwed to the base, making assembly difficult. This is troublesome, and there is a risk of the screws loosening. In particular, the end of the contact fitting on the opposite side to the fixing tongue tends to float above the outer peripheral surface of the base, making it difficult to contact the external power supply side power feeding fitting.

The present invention was developed based on the above circumstances, and its purpose is to ensure that the contact metal fitting contacts the external power supply side power feeding metal fitting, and that this contact metal fitting is difficult to come off from the insulating base. The object of the present invention is to provide a straight tube fluorescent lamp whose metal fittings can be easily assembled to an insulating base.

[Structure of the invention] (Means for solving the problem) In other words, the invention forms a plurality of fitting grooves extending in the axial direction on the peripheral wall of an insulating base attached to both ends of a straight pipe valve. , these fitting grooves are wider on the inside than on the outside, and one end of the groove is open to the end surface of the base, and a contact fitting is fitted into each of these fitting grooves, and this contact fitting is radially extended from the outer peripheral surface of the base. It has a contact protrusion protruding in the direction and a connecting piece continuous to the contact protrusion, the bottom side of the contact protrusion expands in correspondence with the fitting groove,
The contact fitting is press-fitted into the fitting groove from the end surface side of the base, and the lead wire connected to the electrode is connected to the connecting piece.

(Function) According to the present invention, since the contact fitting is provided with the contact protrusion projecting in the radial direction from the outer circumferential surface of the base, it is reliably electrically and mechanically connected to the external power supply side power feeding fitting. In addition, this contact fitting is press-fitted into and engaged with a fitting groove that expands at the bottom and expands on the inside compared to the outside, so the contact fitting firmly engages with the fitting groove and is connected to the lamp. The contact fitting will not come off even if a rotational moment about the tube axis is applied.
Furthermore, since the contact fitting can be inserted into the fitting groove from the end surface side of the base, assembly of the contact fitting is extremely easy. Furthermore, since the lead wire connected to the electrode is connected to the connection piece formed integrally with the contact fitting, the contact fitting is prevented from slipping out of the fitting groove, and the lead wire and the contact fitting can be easily connected. .

(Example) A first example of the present invention will be described below based on FIGS. 4 to 7.

Figure 4 shows one end of a straight tube fluorescent lamp;
A base 10 is attached to the end of the straight glass bulb 1 with an adhesive (not shown).

The base 10 is formed of a flame-retardant insulating material such as Bakelite or nylon resin into a cylindrical shape with a bottom. In the peripheral wall of the base 10, fitting grooves 11, 11 are formed, for example, symmetrically and facing each other. These fitting grooves 11, 11 extend along the axial direction of the base 10, and openings of the grooves are opened on the outer peripheral surface of the base 10. One end is open to the end surface of the base 10.

These fitting grooves 11, 11 have guide grooves 12 formed along the axial direction at the bottom, and the width of the guide grooves 12 is larger than the width of the opening of the fitting groove 11. There is. Instead of such a guide groove 12, the fitting groove 11 may be a dovetail groove whose bottom side is widened.In short, the fitting groove 11 may have a shape that is widened on the inside (bottom side) compared to the outside. .

In such fitting grooves 11, 11, contact fittings 1 are provided.
4 and 14 are inserted. Contact fittings 14, 14
is formed by pressing a conductive plate material such as copper or copper alloy. That is, as shown in FIG. 7, the contact fitting 14 includes a flange portion 15, a contact protrusion 16 protruding from the flange portion 15,
and this contact protrusion 1 from the flange portion 15.
integrally provided with a connecting piece 13 extending in the longitudinal direction of 6;
It is generally semi-cylindrical in shape as a whole.

Such a contact fitting 14 is connected to the flange portion 15.
is attached to the fitting groove 11 by fitting into the guide groove 12. That is, since the fitting groove 11 is open on the end surface of the base 10, the flange portion 15 of the contact fitting 14 is opposed to the guide groove 12 from the end surface side of the base 10, and is pushed into the guide groove 12. At this time, if the width of the flange portion 15 is formed to be very slightly larger than the width of the guide grooves 12, 12 and the contact fitting 14 is press-fitted, the base 10 will be slightly elastically deformed and this return force will cause the flange portion to
5 is crimped to the base 10, and the contact fitting 14 is fixed to the base 10.

A connection hole 18 is formed in the connection piece 13 formed continuously with the flange portion 15 of the contact fittings 14, 14, and the connection hole 18 has an electrode 6 (as shown in FIG. 1) in the valve 1. ) and is connected to an external lead wire 19 led out from the end of the valve 1. That is, the external lead wire 19 is guided to the fitting groove 11 through a conduction hole 20 formed in the peripheral wall of the base 10, and is inserted into the connection hole 18 of the connection piece 13 inserted into the fitting groove 11. , are connected to the connecting piece 13 by solder (not shown).

In the contact fitting 14 attached to the base 10 in this way, the outer surface of the contact protrusion 16 is attached to the base 10.
Projects outward from the outer peripheral surface of 0. Such contact protrusions 16, 16 are elastically held by power supply fittings 17, 17 for power connection on the instrument side shown in FIG.

That is, the fixture supporting the lamp is equipped with a pair of power supply fittings 17, 17 facing each other, and by pushing the lamp in a direction perpendicular to the tube axis, that is, in the direction of arrow A in FIG. 1
7 and 17 elastically. Therefore, the power supply fittings 17, 17 and the contact portions 16 of the contact fittings 14, 14 are in electrical contact with each other, and the lamp is supported by these power feeding fittings 17, 17.

In the straight tube type fluorescent lamp having such a structure, the contact fittings 14, 14 are arranged on the outer peripheral surface of the base 10, so there is no cap pin protruding in the axial direction from the end of the tube as in the past, and therefore the cap The bulb length can be increased by an amount corresponding to the amount of protrusion of the pin, and even in this case, the overall length L of the lamp does not increase and can remain the same as before. As the bulb length increases, the relative light output at the end of the tube can be improved, and the effective light emitting length increases.

In this case, the base 1 is attached to the contact fittings 14, 14.
a contact protrusion 16 protruding in the radial direction from the outer circumferential surface of the
16, these contact protrusions 16, 16 engage with the external power supply side power supply fittings 17, 17, and therefore electrical and mechanical connection is established reliably.

In addition, the contact fitting 14 is connected to the fitting groove 1 of the base 10.
1 and 11, the end of the fitting groove 11 is open to the end face of the base 10, so the flange part 15 of the contact fitting 14 is pushed into the guide groove 12 from the end face side of the base 10. Can be attached.

In this case, since the flange portion 15 is pressed against the base 10 by the elastic return force of the guide groove 12, the contact fitting 14 is prevented from slipping out from the fitting groove 11.

At the same time, the external lead wire 19 led out from the valve 1 is soldered to the connecting piece 13 formed on the contact fitting 14, so that the contact fitting 14 is This also prevents the fitting from slipping out of the fitting groove 11.

Therefore, it is easy to attach the contact fitting 14 to the base 10, and the contact fitting 14 is reliably prevented from coming off. Therefore, the contact fitting 14 will not come off even if shock or vibration is applied.

Further, since the external lead wire 19 is connected to the connecting piece 13 formed continuously on the contact protrusion 16, the work of connecting the external lead wire 19 is also facilitated.

Furthermore, the contact protrusion 16 of the contact fitting 14 that protrudes outward from the outer peripheral surface of the base 10 is elastically held between the power feeding fittings 17, 17 on the instrument side shown in FIG. When the contact fitting 14 is removed or subjected to impact or vibration, the contact fitting 14 receives a moment that may cause it to wrench. However, since the flange portion 15 formed on the contact fitting 14 engages with the guide groove 12 of the fitting groove 11, the moment applied to the contact fitting 14 is transferred to the flange portion 15.
The guide groove 12 is received through the contact fitting 14, thereby preventing the contact fitting 14 from coming off.

Furthermore, the fitting grooves 11, 11 of the base 10 can be molded with resin, and the contact fitting 14 can be press molded, allowing mass production.

In the above embodiment, the connecting piece 13 of the contact fitting 14 is simply extended in the axial direction of the contact protrusion 16, and this connecting piece 13 is positioned inside the fitting groove 11, so that the connection provided on this connecting piece 13 is External lead wire 1 in hole 18
8 is soldered, the present invention is not limited to this, and the present invention is not limited to this.
It may be constructed as in the second embodiment shown in the figure.

That is, in the second embodiment, concave grooves 22, 22 that are continuous with the fitting groove 11 are formed on the end surface of the base 10, and the contact protrusions 16, 1 of the contact fittings 14, 14 are formed.
Connecting pieces 21, 21 extending in the axial direction from 6 are bent at their tips to form concave grooves 22, 21 on the end face of the base 10,
It is inserted into 22.

These bent connection pieces 21, 21 have connection holes 18,
18, and external lead wires 19, 19 led out from the end of the valve 1 are connected to the connection hole 1 through conduction holes 20, 20 formed in the end wall of the base 10.
8 and 18, and connected by solder (not shown).

Even in this case, the same effects as in the first embodiment can be obtained.

Further, the contact fitting 14 is not limited to being formed by pressing a plate material, and may be formed into a solid shape by swaging or the like.

Further, as described above, the fitting groove 11 may have a dovetail groove shape, and if the fitting groove 11 has a dovetail groove shape, the contact fitting 14 will have a wider bottom side and the flange portion 12 will not be necessary.

Furthermore, this invention is not limited to an aperture-type fluorescent lamp used as a light source for a copying machine, but can also be implemented with a straight-tube fluorescent lamp used in a general household.

[Effects of the invention] As described above, according to the invention, the contact fitting is provided with a contact protrusion that protrudes in the radial direction from the outer peripheral surface of the base, thereby ensuring reliable electrical and mechanical connection with the external power supply side power feeding fitting. connected. In addition, this contact fitting has a shape where the bottom part is expanded to correspond to the fitting groove, which is expanded on the inside compared to the outside.
The press-fitted contact fitting firmly engages with the fitting groove, and will not come off even if rotational moment about the tube axis or prying force is applied to the lamp from the external power supply side power supply fitting. Furthermore, since the contact fitting can be inserted into the fitting groove from the end face side of the base, attachment of the contact fitting becomes extremely easy.
Since the lead wire connected to the electrode is connected to the connection piece formed on such a contact fitting, the contact fitting is prevented from slipping out of the fitting groove, and the connection between the lead wire and the contact fitting is facilitated. It can be done.
Therefore, a highly reliable lamp suitable for mass production can be provided at a low cost.

[Brief explanation of the drawing]

Figures 1 to 3 show the conventional technology. Figure 1 is a front view of a straight tube fluorescent lamp, and Figure 2 is a front view of a straight tube fluorescent lamp.
The figure shows the light distribution characteristics, and Figure 3 is in Figure 1.
It is a sectional view along a line. 4 to 7 show a first embodiment of the present invention, in which FIG. 4 is a perspective view of the end of a straight tube fluorescent lamp, FIG. 5 is an end view, and FIG.
The figures are a cross-sectional view taken along the line - in FIG. 5, FIG. 7 is a perspective view of the contact fitting, FIGS. 8 and 9 show a second embodiment of the present invention, and FIG. FIG. 9 is a sectional view taken along the line - in FIG. 8. 1... Valve, 10... Base, 11... Fitting groove, 12... Guide groove, 14... Contact fitting, 15
...Flange part, 16...Contact protrusion, 13, 21
... Connection piece, 18 ... Connection hole, 19 ... Lead wire.

Claims (1)

[Scope of utility model registration request] An insulating base is attached to both ends of the straight pipe valve, and a plurality of fitting grooves extending in the axial direction are formed on the peripheral wall of this base, and these fitting grooves are wider on the inside than on the outside. One end is open to the end surface of the base, and a contact fitting is fitted into each of these fitting grooves, and this contact fitting has a contact protrusion that protrudes in the radial direction from the outer peripheral surface of the base, and is continuous with the contact protrusion. A connecting piece is provided, the bottom side of the contact protrusion expands in correspondence with the fitting groove, and the contact fitting is press-fitted into the fitting groove from the end face side of the base to connect the electrode to the connecting piece. A straight tube fluorescent lamp characterized by a lead wire connected.