JPH0633641Y2 - Straight tube fluorescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Use) The present invention relates to a straight tube fluorescent lamp having an improved structure of a base.

(Prior Art) Generally, in a straight tube type fluorescent lamp, caps are attached to both ends of a straight tube type glass bulb, and contact fittings, that is, cap pins projecting in the tube axis direction are provided on the end faces of these caps. , And is mechanically and electrically connected to the socket on the instrument side through the cap pin. However, in a fluorescent lamp provided with such a base pin, the lamp length is increased by the protrusion amount of the base pin, so that not only the size of the fixture becomes large, but also the relative light output at the tube end portion decreases. Therefore, there is a problem that the effective light emission length is relatively shorter than the lamp length.

When such a lamp is used as a light source for exposure of a copying machine, there is a problem that the effective width of copying is narrowed compared to the ratio of the lamp length, and improvement in relative light output at the tube end is required.

As a countermeasure, if the base pin is eliminated, the bulb length can be extended by the protrusion length of the base pin, and if the total length of the lamp remains the same as before, the effective light emission length increases, that is, the tube end portion. It is possible to improve the relative light output of.

As an alternative to the base pin projecting in the tube axis direction, it is conceivable to dispose the contact fittings on the outer peripheral surface of the insulating base attached to both ends of the valve. As such a technique, the technique disclosed in Japanese Utility Model Publication No. 36-22239 or Japanese Patent Application Publication No. 56-121261 is already known.

(Problems to be solved by the invention) In the mouthpiece having the structure as disclosed in Japanese Utility Model Publication No. 36-22239, the contact metal fittings are arranged on the outer peripheral surface of the insulating base. It is electrically connected to the provided power supply side metal fitting, and mechanical support is thereby provided.

However, the structure shown in the above publication has a drawback that contact with the external power supply side power supply fitting is uncertain because the contact fitting has the same arcuate surface as the outer peripheral surface of the insulating base.

Further, as described above, such a straight tube fluorescent lamp is electrically connected and mechanically supported to the power supply side metal fitting provided on the outside in the radial direction of the base, so that the lamp is axially supported. It becomes easy to displace. In other words, since there is nothing that restricts the movement of the lamp in the axial direction, the lamp easily moves in the axial direction when it is subjected to vibration or impact, and due to such movement, the contact metal fittings provided on the outer peripheral surface of the base. May come off the external power supply side power supply fitting and may not come into contact.

Further, the base of the structure disclosed in Japanese Patent Laid-Open No. 56-121261 is disclosed in Japanese Utility Model Publication No. 36-22239 because the contact fitting has a pin structure even if it projects from the outer peripheral surface of the insulating base. It is possible to suppress the axial movement, which is a drawback of the cap like this, but rather it makes axial movement impossible at all, so even if there is a slight manufacturing error, it is impossible to fit into the socket. There is a risk of becoming. Further, there is a problem that the structure of the socket that can be moved in the axial direction becomes extremely complicated.

The present invention has been made in view of the above circumstances, and its purpose is to ensure that the contact fitting securely contacts the external power supply fitting on the power supply side, and that the contact state is ensured even if the axial displacement occurs. It is intended to provide a straight tube fluorescent lamp that can be maintained.

[Means for Solving the Problems] (Means for Solving the Problems) That is, the present invention provides a plurality of contact fittings connected to electrodes on the peripheral surface of an insulating base adhered to both ends of a straight pipe type valve, These contact fittings project from the peripheral surface of the base in a radial direction and have a projecting portion that faces the axis of the valve, and the projecting portion extends along the axial direction of the base.
In addition, the cross section at any position along the axial direction of the base has a substantially semicircular shape with the same outer shape.

(Operation) According to the present invention, since the plurality of contact fittings provided on the peripheral surface of the insulating base are projected in the radial direction from the peripheral surface of the base, the contact fittings securely contact with the external power supply side power supply fitting, and the Mechanical and mechanical connections are ensured. In addition, the protrusion of the contact fitting has the same outer shape in the cross section at any position along the axial direction of the base, that is, at the cross section at any position, so that even if the lamp is displaced in the axial direction, It is possible to maintain good contact with the power supply side metal fitting. In addition, the protrusion makes it possible to prevent a rotational shift against a large torque, and to reliably support the torque. Further, since the protrusion has a substantially semicircular cross section facing the axis of the valve, the power supply metal fitting can smoothly slide on the surface of the protrusion, and the socket can be fitted very smoothly. Therefore, the structure of the socket can be simplified. Moreover, since the cross-sectional shape is the same in the axial direction, the fitting can be smoothly performed even if the position is slightly displaced.

(Embodiment) The first embodiment of the present invention will be described with reference to FIGS.
It will be described with reference to the drawings.

1 shows the end of a straight tube fluorescent lamp, which has a base 10 attached to the end of a straight tube glass bulb 1.

A publicly-known electrode (not shown) is sealed at the end of the bulb 1, and a phosphor coating (not shown) is provided on the inner surface of the bulb 1.

The base 10 is made of a flame-retardant insulating material such as bakelite or nylon resin and has a bottomed cylindrical shape.
Fitting grooves 11, 11 are formed on the peripheral wall of the base 10 so as to face each other at symmetrical positions. These mating grooves 11,
The reference numeral 11 extends along the axial direction of the base 10, and the opening of the groove is opened on the outer peripheral surface of the base 10. Then, one ends of these fitting grooves 11, 11 are open to the end surface of the base 10.

These fitting grooves 11, 11 are guide grooves 12 along the axial direction at the bottom.
Are formed, and the width of these guide grooves 12 is formed larger than the width of the opening of the fitting groove 11. Instead of such a guide groove 12, the fitting groove 11 may be a dovetail groove whose bottom side is expanded, and in short, the fitting groove 11 may have a shape in which the inner side (bottom side) is wider than the outer side. .

Contact fittings 14, 14 are inserted into the fitting grooves 11, 11 as described above. The contact fittings 14 and 14 are formed by pressing a conductive plate material such as copper or copper alloy. That is, as shown in FIG. 4, the contact fitting 14 includes a flange portion 15, a contact protrusion 16 protruding from the flange portion 15, and a connecting piece extending from the flange portion 15 in the longitudinal direction of the contact protrusion 16. It is provided with 13 integrally and is formed in a substantially semicylindrical shape as a whole. The contact protrusion 16 corresponds to the protrusion of the present invention, extends in a mountain shape along the longitudinal direction (axial direction), and has a semi-circular shape having the same shape at any position in the axial direction. ing.

The contact fitting 14 is attached to the fitting groove 11 by fitting the flange portion 15 into the guide groove 12.
That is, since the fitting groove 11 is open to the end surface of the base 10, the flange portion 12 of the contact fitting 14 faces 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 slightly larger than the width of the guide grooves 12, 12 and the contact fitting 14 is press-fitted, the base 10 is slightly elastically deformed, and the flange portion 15 is deformed by this restoring force. It will be crimped to the base 10 and contact metal fittings
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 metal fittings 14, 14, and the connection hole 18 is formed.
An external lead wire 19 connected to an electrode (not shown) in the bulb 1 and led out from the end portion of the bulb 1 is connected to 18. That is, the external lead wire 19 is guided to the fitting groove 11 via the 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 in the fitting groove 11. , Is connected to the connection piece 13 by solder (not shown).

The contact fitting 14 thus attached to the base 10 is
The outer surface of the contact projection 16 projects outside the outer peripheral surface of the base 10. Such contact protrusions 16 and 16 are elastically clamped by the power supply connecting metal fittings 17 and 17 on the appliance side shown in FIG.

That is, the fixture that supports the lamp is a pair of power supply fittings 17,1
7 are provided so as to face each other, and when the lamp is pushed in the direction orthogonal to the tube axis, that is, in the direction of arrow A in FIG. 2, the lamp is elastically sandwiched between these power supply fittings 17, 17. Therefore, the power supply fittings 17 and 17 and the contact portions 16 of the contact fittings 14 and 14 electrically contact each other, and the lamps are supported by the power supply fittings 17 and 17.

The straight tube type fluorescent lamp having such a structure has the contact fittings 14,
Since 14 is arranged on the outer peripheral surface of the base 10, there is no mouthpiece pin projecting in the axial direction at the pipe end, and therefore the valve length can be lengthened by an amount corresponding to the amount of protrusion of the mouthpiece pin. The lamp total length L does not increase, and the length can be kept the same as the conventional one. And the relative light output at the tube end can be improved by the length of the bulb,
The effective light emission length is increased.

Moreover, in this product, the contact protrusion 16 of the contact fitting 14 is the base 10.
Since it protrudes outward from the outer peripheral surface of the device, the power supply fittings 17, 17 on the device side shown in FIG. Further, these power supply fittings 17, 17 are connected to the contact projections 16, 1.
Since 6 is elastically clamped, it is possible to prevent rotation against a large torque because it is protruding, and mechanical support is also ensured, so that it does not come off from the power supply fittings 17, 17.

In the case of such a base 10, the pair of power supply fittings 17, 17 facing each other are mounted in the direction of arrow A in FIG. 2, that is, the power supply fittings 17 are inserted in the direction orthogonal to the axis of the lamp. Since the lamp is elastically sandwiched between the power supply fittings 17 and 17, the lamp may fluctuate along the axial direction and may be sandwiched between the power supply fittings 17 and 17 at a position displaced in the axial direction.

In the present embodiment, the contact protrusion 16 of the contact fitting 14 is extended by a predetermined length along the axial direction, and the cross-sectional shape is the same at any position in the axial direction. Power supply metal fitting 1 at the position where it fluctuates or is displaced
Even if it is sandwiched between 7,17, the contact protrusions 16 and 16 are surely the power supply metal fittings 1.
There is no problem such as contact with 7 and 17 and locking, keeping the energized state, supporting state and dropping.

Further, since the cross sections of the pair of facing contact protrusions 16 are substantially semicircular with the same outer shape, the structure of the power supply fitting 17 of the socket can be simplified, and the power supply fitting 17 has a substantially semicircular surface of the contact projection 16. Can be slid smoothly and easily fitted. For these reasons, the structure of the socket power supply fitting 17 can be simplified. Moreover, since the contact projections 16 have the same cross-sectional shape extending in the axial direction, even if the valve is slightly displaced in the axial direction, the fitting can be smoothly performed.

In the above embodiment, the connection piece 13 of the contact fitting 14 is simply extended in the axial direction of the contact protrusion 16, the connection piece 13 is located inside the fitting groove 11, and the connection piece 13 is provided with the connection piece 13. The case where the external lead wire 18 is soldered to the hole 18 has been described. However, the present invention is not limited to these, and is configured as in the second embodiment shown in FIGS. 5 and 6. May be.

That is, in the second embodiment, the recessed grooves 22, 22 that are continuous with the fitting groove 11 are formed on the end surface of the base 10, and the contact fittings 14, 14 are formed.
The connecting pieces (21, 21) extending in the axial direction from the contact protrusions (16, 16) are bent at the tips and fitted into the concave grooves (22, 22) on the end surface of the base (10).

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

Even in this case, the same effect as that of the first embodiment can be obtained.

In each of the above-described embodiments, the contact fitting 14 is locked into the fitting groove 11 by press fitting, and the connection edge 13 of the contact fitting 14,
Since the lead wire 18 is connected to 21, the contact metal fitting 14 is
It is prevented from slipping out.

Further, the contact fitting 14 is not limited to the plate material formed by pressing, and may be formed in a solid shape such as swaging.

Further, the present invention is not limited to the fluorescent lamp used as the light source of the copying machine, and can be implemented even in a straight tube fluorescent lamp used in a general home.

[Effects of the Invention] As described above, according to the present invention, since the plurality of contact fittings provided on the peripheral surface of the insulating base are projected in the radial direction from the peripheral surface of the base, the contact fittings of the external power supply side and Positive contact is made and electrical and mechanical connections are ensured. Moreover, since the protruding portion of the contact fitting has the same outer shape even if it is cross-sectioned at any position along the axial direction of the base, even if the lamp is displaced in the axial direction, the contact between the power supply side power fitting and the contact fitting is Good condition is maintained and reliable electrical connection and mechanical support are possible. In addition, since the cross sections of the pair of contact protrusions facing each other have a substantially semicircular diameter with the same outer shape, the structure of the power supply fitting of the socket can be simplified, and the power supply fitting can smoothly move the substantially semicircular surface of the contact projection. It can be slipped and easily fitted, and thus the structure of the power supply fitting of the socket can be simplified.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a perspective view of an end portion of a straight tube type fluorescent lamp, FIG. 2 is an end view and FIG. 3 is FIG. Sectional view taken along the line III-III, 4th
FIG. 5 is a perspective view of a contact fitting, FIGS. 5 and 6 show a second embodiment of the present invention, FIG. 5 is a side view, and FIG. 6 is a sectional view taken along line VI-VI in FIG. Is. 1 ... Valve, 10 ... Base, 11 ... Fitting groove, 12 ... Guide groove, 14 ... Contact fitting, 15 ... Flange section, 16 ... Contact projection section.

Continuation of the front page (56) Reference JP-A-56-121261 (JP, A) Actually opened 58-113989 (JP, U) Actual public 36-22239 (JP, Y1) Actual public 39-25167 (JP , Y1)

Claims (1)

[Scope of utility model registration request] 1. An insulating base is attached to both ends of a straight pipe type valve, and a pair of facing metal fittings connected to electrodes are provided on the peripheral surface of the base. Has a protruding portion that protrudes in the radial direction from the protruding portion that extends in the axial direction of the base and has a substantially semicircular shape with the same outer shape in cross section at any position along the axial direction of the base. A straight tube fluorescent lamp that is characterized by