JPH07240177A - Compact self-ballasted fluorescent lamp device - Google Patents

Abstract

PURPOSE:To provide a compact self-ballasted fluorescent lamp device in which a molding mold has simple structure and the inclination or shaking of a base fixed to a cylindrical part is prevented. CONSTITUTION:In a compact self-ballasted fluorescent lamp device in which a screw base 3 is screwed in a cylindrical part 2 formed in a synthetic resin cover 1, three or more projections 21a-21f are formed on the outer circumferential surface of the cylindrical part, and arranged so that the projections form a vertical screw thread having the length of one turn or more when these projections are connected. These projections are arranged separately each other in a circumferential direction, and slits 22a-22f which are continued to the projections, extended toward the root of the cylindrical part, have the opened extended end, and are opened on the inner surface and the outer surface of the cylindrical part are formed. Since the base fixed to the cylindrical part is locked to three or more projections separated each other, inclination or shaking of the base is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb type fluorescent lamp device in which a fluorescent lamp is attached to a cover having a base at one end.

[0002]

2. Description of the Related Art Recently, as disclosed in Japanese Unexamined Patent Publication No. 61-173446, a partition plate is provided at the other end of a cover having a screw-type base for an incandescent light bulb at one end, and a partition plate is provided in the cover. , A ballast or a lighting device consisting of high-frequency electronic lighting circuit parts, etc.
Fluorescent lamp devices having a structure in which a bent fluorescent lamp such as a letter-shaped, W-shaped or saddle-shaped lamp is attached and, in some cases, the lamp is covered with a globe have been developed and are already on the market. This type of fluorescent lamp device is compatible with incandescent light bulbs because it contains a lighting device for maintaining the lighting of the fluorescent lamps in the cover. It can be used as a light source and is therefore referred to as a bulb-type fluorescent lamp device.

This type of light bulb type fluorescent lamp device is a PB.
E on one end of the cover made of heat resistant synthetic resin such as T resin
It is equipped with a screw-in type base such as the 26 type, and this base can be screwed into a socket for an incandescent light bulb. Such a base is attached to a cylindrical portion protruding from one end of the cover. In the conventional case, a spiral protrusion is provided on the outer peripheral surface of the cylindrical portion to form a male screw portion, and the E26 type screw-type die is screwed into the male screw portion, and the die is attached to the cylindrical portion by an adhesive or caulking. A fixed structure was used.

However, when a spiral protrusion is integrally formed on a cylindrical portion protruding from one end of a cover made of synthetic resin, a molding die for molding the protrusion passes through the central axis of the cylindrical portion. It is necessary to divide into left and right on the dividing plane. On the other hand, since the cover has a cylindrical portion and a diameter-expanded portion that is continuous with the cylindrical portion and expands in a trumpet shape, a mold that is divided along the central axis direction is required. Therefore, according to the conventional structure, the mold for molding the cover is divided into the left and right split molds for molding the cylindrical portion with the external thread portion formed on the outer surface, and the split mold along the central axis direction. Other molds have a total of at least three divided structures. Therefore, the mold structure is complicated, the mold cost is high, and the manufacturing cost is high, resulting in high manufacturing cost.

On the other hand, by stopping the continuous formation of the male thread portion over the entire spiral line, the male thread part is divided into a plurality of protrusions along the spiral line, that is, each divided protrusion connects these. If it is assumed that the protrusions are divided into threads, the protrusions are distributed so that they are not overlapped with each other in the central axis direction of the cylindrical portion. A structure in which a slit is formed along the central axis direction has been considered.

With such a construction, the mold can be injection-molded with only the two molds divided along the central axis direction of the cylindrical portion, and the cost of the mold becomes low, so that the product can be manufactured. There are advantages such as lower costs.

[0007]

However, in the cylindrical portion having such a structure, if the number of projections forming the virtual screw thread is small, the number of contact points between the cap and the projection covered by the cylindrical portion is reduced, and the cap is I am worried about tilting or rattling.

The present invention has been made in view of the above circumstances. The object of the present invention is to make it possible to form the molding die with a simple structure and to tilt or rattle the die capped on the cylindrical portion. It is an object of the present invention to provide a light bulb type fluorescent lamp device which is not turned on.

[0009]

According to a first aspect of the present invention, a screw thread is formed in a cylindrical portion projecting from one end of a synthetic resin cover, and a screw-type mouthpiece covering the cylindrical portion has the screw thread. In the bulb-type fluorescent lamp device in which the lighting device is housed in the cover and the fluorescent lamp is attached to the other end of the cover, the outer peripheral surface of the cylindrical part At least three or more protrusions are formed on the ridge, and when these protrusions are connected, they are arranged so as to form a virtual thread having a length of one turn or more, and these protrusions surround each other. Are formed so as to be spaced apart from each other in the direction, and the side wall of the cylindrical portion is formed with slits that are respectively continuous with the protrusions and extend from the protrusions toward the root direction of the cylindrical portion. Together with an end portion extending to the base direction of the section is open to the extension direction, in communication with the inner and outer surfaces of the cylindrical portion, characterized in that it is open.

According to a second aspect of the invention, the plurality of protrusions are in a non-contact state with respect to a surface which is a valley of a screw when the tangent line contacts the protrusion when a virtual tangent line is drawn on the outer surface of the cylindrical portion. It is arranged in.

According to a third aspect of the present invention, in the screw-in die which is screwed into the screw thread, the wall surface of the slit is dented and deformed, and the deformed portion is engaged with the slit.

According to a fourth aspect of the present invention, the end surface of each of the protrusions toward the slit is formed as an inclined surface that is inclined toward the tip of the cylindrical portion as it goes toward the inner surface of the cylindrical portion.

[0013]

According to the invention of claim 1, three or more protrusions formed on the outer peripheral surface of the cylindrical portion are arranged so as to form a virtual thread having a length of one turn or more when these protrusions are connected. In addition, since these protrusions are arranged so as to be spaced apart from each other in the circumferential direction, the screw-type base which is covered on the cylindrical portion is separated from the central axis direction and is distributed in the circumferential direction in three or more pieces. Since the caps are engaged with the protrusions, and the caps are engaged with the plurality of protrusions separated from each other, inclination and rattling of the caps are prevented.

In addition, the cylindrical portion is formed with slits which are respectively continuous with the projections and extend from these projections toward the root direction of the cylindrical portion, and these slits have end portions extending in the root direction of the cylindrical portion. Since it is opened in the extension direction and is open to communicate with the inner and outer surfaces of the cylindrical part, the mold can be divided into two along the central axis direction when molding, and the mold structure is simple. The shape can be easily removed.

According to the second aspect of the present invention, the screw-in die comes into contact with a plurality of circumferentially spaced projections and separates from the roots of the screws, thereby preventing rattling in the radial direction.

According to the third aspect of the present invention, the wall surface of the die is dented and deformed, and the deformed portion is engaged with the slit.
The rotation of the die is blocked, and the die can be fixed to the cylindrical portion without using a special adhesive.

According to the fourth aspect of the present invention, since the inclined surface is formed on the surface of the protrusion with respect to the slit, the lead wire introduced from the lamp or the lighting device is inserted into the cylindrical portion and guided to the base side. Is prevented from being guided by the inclined surface and caught on the end of the protrusion.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 and 2 are views showing an example of a light bulb type fluorescent lamp device, and the overall configuration of the light bulb type fluorescent lamp device will be briefly described with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a cover made of a heat-resistant synthetic resin such as PBT resin. The cover 1 has a cylindrical portion 2 integrally formed with one end of a diameter-expanded portion 11 which has a flared shape. A screw-type base 3 such as an E26 type is fixed to the cylindrical portion 2 by means described later.

The other end of the cover 1 is closed by a partition board 4. The partitioning board 4 is also made of a heat-resistant synthetic resin such as PBT resin, and has a substantially circular dish shape. As shown in FIG. 2, the partitioning board 4 has a flange portion 42 formed at the upper end opening edge of a side wall 41 having a rising shape. The tongue pieces 43 ... Are formed. The locking tongues 43 ... Are formed so as to divide the flange 42 in the circumferential direction by the slits 44 provided in the flange 42. Therefore, the locking tongues 43 ... It is elastically deformable in the radial direction.

In contrast to the locking tongues 43 ... Such locking tongues 43 ... Are integrally formed on the inner surface of the enlarged diameter portion 11 of the cover 1 with the locking tongues 43. . That is, when the cover 1 and the partition board 4 are butted against each other, the locking tongue pieces 43 ... Deform elastically and ride over the locking projections 12 ,.
, And the locking projections 12 are engaged with each other.

A plurality of fixed claws 45 ... Are formed on the partition board 4, and the lighting device 5 is attached to these fixed claws 45. The lighting device 5 includes a circuit board 50 and a high frequency lighting circuit component 51 using a transistor inverter.
It is configured by implementing ... High frequency lighting circuit parts 51
For example, a well-known noise filter, a full-wave rectifier, a smoothing capacitor, a switching circuit including a transistor, a thyristor, a positive temperature coefficient thermistor, a choke ballast, a DC cut capacitor, and a resonance capacitor are used. In addition, from the lighting device 5, a lead wire 55,
55 is extended, and these lead wires 55, 55 are connected to the base 3.

The lighting device 5 as described above includes the wiring board 5
0 is hooked on the fixing claws 45 of the partitioning board 4 and fixed to the partitioning board 4. Lamp mounting cylinders 46, 46 are integrally formed on the lower surface of the partition board 4. The fluorescent lamp 6 is mounted on the lamp mounting cylinder portions 46, 46. The fluorescent lamp 6 may be U-shaped, W-shaped or the like, but this embodiment uses a saddle-shaped fluorescent lamp. In this saddle-shaped fluorescent lamp 6, both ends 61, 61 of a bulb 60 are juxtaposed in parallel with each other, and a U-shaped central bent portion 62 is provided between the both end portions 61, 61. The central bent portion 62 is formed by bending so as to face the same direction as the both end portions 61, 61. Electrodes 6 are provided on both ends 61, 61 of the valve.
3 is enclosed. In addition, the above-mentioned both ends 6 of the valve 60
A thin tube 64, 64 is projected in each of the thin tubes 1, 61, and an amalgam 65 for controlling the mercury vapor pressure during lighting is housed in at least one of the thin tubes 64, 64.

A phosphor coating (not shown) is formed on the inner surface of the bulb 60, and a rare gas such as argon is enclosed in the bulb. Such a bent fluorescent lamp 6 is inserted from below the partition board 4 into the lamp mounting tube portions 46, 46 having both ends 61, 61 formed on the partition board 4, and these end portions 61, 61 and the tube are fitted together. It is fixed to the partition board 4 by a thermosetting adhesive 47 such as silicone filled between the parts 46 and 46. Further, the central bent portion 62 of the lamp 6 is joined to the lower surface of the partition board 4 by another adhesive 48. Therefore, the saddle type fluorescent lamp 6
It is fixed to the partition board 4 at a total of three places, that is, the both end portions 61, 61 and the central bent portion 62.

The bent fluorescent lamp 6 is covered with a globe 7 shown in FIG. The globe 7 is made of transparent or light-diffusing synthetic resin or glass, and has a cup shape with an open upper end. This glove 7
Has a straight neck portion 71 having a slightly smaller upper end opening. Such a neck 71 of the glove 7
1, is inserted into a ring-shaped gap formed between the inner surface of the cover 1 and the rising side wall 41 of the partition board 4, and the inner surface of the cover 1 and the partition board 4 are raised by the adhesive 72. It is joined to the side wall 41.

Next, the connecting structure of the cover 1 and the base 3 will be described. As shown in the drawings starting from FIG. 3, the cover 1 is a trumpet-shaped expanded portion 11 that accommodates the lighting device 5.
The cylindrical portion 2 is integrally formed at the end of the. A large number of protrusions 21a to 21f are formed on the outer peripheral surface of the cylindrical portion 2. As shown in FIGS. 6 and 7, the protrusions 21a to 21f are 1 when the protrusions 21a to 21f are connected.
It is arranged so as to form a virtual screw thread having a length of one turn or more. In other words, it has a structure in which a screw thread having a length of one turn or more is divided into a plurality of protrusions along its spiral line. . The length of the virtual thread is one turn or more, but preferably has a length of less than 2 turns, for example 3
90 ° to 540 ° is preferable. These protrusions 21a to 21
One f is formed at each end of the virtual thread and at least one f is formed at other locations. Therefore, a minimum of three are provided, and in this embodiment, a total of six protrusions 21a are provided. .About.21f are arranged at equal intervals of about 70.degree. In the circumferential direction. Thereby, each of the protrusions 21a to 21f
Are arranged so as not to overlap along the central axis direction.

In this case, the protrusions 21a to 21f
As shown in FIG. 6, when the tangent line T is drawn on the outer surface of the cylindrical portion 2, the tangent line T always contacts any one of the protrusions 21 a to 21 f no matter where the tangent line T is drawn. That is, it is configured so as to be away from the thread trough and not to contact the thread trough.

The cylindrical portion 2 has a plurality of protrusions 2
Slits 22a to 22f extending in the base direction of the cylindrical portion 2 are formed continuously with 1a to 21f. These slits 22a to 22f continuously open to the inner surface and the outer surface of the cylindrical portion 2 and extend in the root direction of the cylindrical portion 2, that is, in the direction of the expanded diameter portion 11 of the cover 1, and the extended end portion of this extended portion. Is opened toward the opening on the other end side of the cover 1. That is, these slits 22a to 22f
Extend away from the projections 21a to 21f toward the expanded diameter portion 11 of the cover 1 and are arranged parallel to the central axis of the cylindrical portion 2.

Such slits 22a to 22f are formed for die cutting, and the molding die is formed by the molding die D1 and the molding die D2 which are divided along the central axis direction as shown in FIG. Can be formed. When the molding dies D1 and D2 that have been divided are abutted with each other, a molding space D3 is formed between their inner surfaces, and if PBT resin is injected into this molding space D3 and injection molding is performed. The cover 1 having the structure shown in FIG. 5 is molded. In this case, the plurality of protrusions 21a to 21f are formed along the virtual screw thread.

Then, the molding die D1 and the molding die D2 are divided in the direction of the arrow in FIG. 8 to take out the product.
In this case, the molding die D2 is die-cut from the product in the direction along the central axis as shown by the arrow. By this die cutting, the protrusion 21
Slits 22a to 22f continuous with a to 21f are formed. Conversely, in order to form the protrusions 21a to 21f, it is necessary to perform die cutting in the above-mentioned direction. Therefore, the protrusions 21a to 21f are connected to the protrusions 21a to 21f toward the base direction of the cylindrical portion 2 and the cover 1 is expanded. It is necessary to have slits 22a to 22f that extend in the direction of the diameter portion 11 and whose ends in this direction are open.

With such a structure, the molding die can be composed of two molding dies D1 and D2 as shown in FIG. 8, the structure of the mold is simple, and the manufacturing labor is reduced. Therefore, the cover 1 can be integrally formed at a low cost.

An inclined surface 23 is formed on the end surface of each of the protrusions 21a to 21f facing the slits 22a to 22f. These inclined surfaces 23 have projections 21a to 21f.
On the end faces facing the slits 22a to 22f, respectively, are formed in a shape inclined toward the tip end side of the cylindrical portion 2 as it goes toward the inner surface of the cylindrical portion 2.

Such an inclined surface 23 serves to connect the lead wires 55, 55 (shown in FIG. 2) extending from the lighting device 5 to the base 3 when the partition board 4 is attached to the cover 1. When the cylindrical portion 2 is inserted, the lead wires 55, 55 are prevented from being caught on the end surface of the protrusion 21, as shown in FIG.
55 to the inside of the cylindrical portion 2 and thus lead 55,
The insertion work of 55 is facilitated.

An E26 type base 3 is attached to such a cylindrical portion 2. As is well known, the E26 type base 3 has an external terminal (eyelet terminal) 33 attached to a shell portion 31 made of brass or the like via an insulator 32. 31 is a protrusion 21
It is engaged with the virtual screw thread connecting a to 21f and locked to the cylindrical portion 2. After such crowning, the opening of the base 3 is caulked. That is, as shown in FIG. 3 and FIG. 4, at least one of the slits 22a to 22f, or a plurality of slits 22a to 22f, preferably, about 3 places are opposed to each other.
The opening of the mouthpiece 3 is recessed with a punch or the like. Such a dent deformation 35 enters the slit 22 and locks with the slit 22. That is, when such a concave deformation 35 is locked in the slit 22, the rotation of the base 3 is blocked.

For this reason, the mouthpiece 3 has the protrusions 21a to 21f.
It is screwed to prevent the movement in the radial direction and the direction along the central axis, and the recessed deformation 35 engages with the slit 22 to prevent rotation, so that it is fixed to the cylindrical portion 2. Will be.

The lead wire 55 on one side is connected to the slit 2
It is led out of the cylindrical portion 2 using any of 2a to 22f and soldered to the shell portion 31 of the base 3, and the other lead wire 55 is soldered to the external terminal 33.

The operation of the embodiment having such a configuration will be described. Cover the cylindrical portion 2 with the base 3 and project the protrusions 21a to 21f.
When it is engaged with the screw, the protrusion 21 is formed on the outer peripheral surface of the cylindrical portion 2.
One a to 21f is formed at each end of a virtual thread having a length of one turn or more, and at least one is formed at other places. In this embodiment, a total of six protrusions 21a to 21f are formed. Since are arranged at equal intervals of 70 °,
The base 3 is locked to the cylindrical portion 2 at three or more points. If the base 3 is to be locked to two projections, the base 3 tends to tilt around the line connecting the two locking points as the center of rotation, causing rattling. On the other hand, another protrusion is provided at a different point from the line connecting the above-mentioned two locking points, and the base 3
Is locked, the base is prevented from rotating around the line connecting the two locking points. Therefore, if the base is supported by the projections at three or more places, the rattling of the base is prevented.

In this embodiment, a total of six protrusions 21a-2 are provided.
Since the 1f are arranged at equal intervals of about 70 ° in the circumferential direction, the inclination and rattling of the base 3 are prevented. When the tangent line T is drawn on the outer surface of the cylindrical portion 2, the projections 21a to 21f always come into contact with any of the projections 21a to 21f and the tangent line T is the outer surface of the cylindrical portion 2.
In other words, the base 3 is configured so as not to come in contact with the thread troughs apart from the thread troughs.
Abutting on a to 21f, radial rattling is also prevented.

From the above, the mouthpiece 3 put on the cylindrical portion 2 is properly engaged with the projections 21a to 21f and tilted,
Problems such as rattling are prevented. In addition, the concave deformation 35 is formed by caulking the opening of the base 3, and the concave deformation 35 is inserted into at least one of the slits 22a to 22f and locked with the slit 22 to rotate the base 3. Therefore, the base 3 can be fixed to the cylindrical portion 2 without using a special adhesive. Moreover, in this case, since the slits 22a to 22f opened on the outer surface for die cutting can be used, no special processing or molding is required.

Since the inclined surfaces 23 are formed at the ends of the protrusions 21a to 21f, when the lead wires 55, 55 extended from the lighting device 5 are inserted into the cylindrical portion 2, these leads are formed. The wires 55, 55 are prevented from being caught on the end faces of the protrusions, which facilitates the work of inserting the lead wires 55, 55.

Although the bulb-type fluorescent lamp device of the above-mentioned embodiment covers the fluorescent lamp 6 with the globe 7,
The globe 7 is not always used, but the lamp 6
It can be implemented even with a bulb-type fluorescent lamp device that is used as it is exposed. Further, in the above embodiment,
Although a high frequency lighting circuit component is used as the lighting device 6, a choke coil type ballast may be used.

[0042]

As described above, according to the present invention, the screw-type die covered with the cylindrical portion has three or more protrusions formed on the outer peripheral surface of the cylindrical portion and separated from each other in the central axis direction and the circumferential direction. Since it comes into contact with the base, the base is prevented from tilting or rattling. Moreover, since the protrusions do not overlap along the central axis direction, it is possible to form the slits that are continuous with these protrusions in parallel along the central axis direction, enabling die cutting, and simplifying the molding die structure. The mold cost can be reduced and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an entire bulb-type fluorescent lamp device showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the same embodiment without the gloves.

FIG. 3 is an exploded perspective view showing a cover and a base of the same embodiment.

FIG. 4 is a cross-sectional view showing a state where a base is attached to the cover of the same embodiment.

FIG. 5 is a sectional view of only the cover of the embodiment.

FIG. 6 is a plan view of a cylindrical portion of the embodiment.

FIG. 7 is a diagram showing the arrangement of protrusions by expanding the cylindrical portion of the embodiment.

FIG. 8 is a cross-sectional view of the cover of the embodiment when molded with a mold.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cover 2 ... Cylindrical part 3 ... Base, 4 ... Partition board 5 ... Lighting device 6 ... Bending type fluorescent lamp 7 ... Globe 21a-21f ... Protrusion 22a-22f ... Slit 23 ... Inclined surface 31 ... Shell part 33 ... External Terminal 35 ... Dent deformation part D1, D2 ... Mold

Claims (4)

[Claims] 1. A screw thread is formed on a cylindrical portion projecting from one end of a synthetic resin cover, and a screw-type mouthpiece covering the cylindrical portion is screwed onto the screw thread and fixed to the cylindrical portion. In a light bulb type fluorescent lamp device in which a lighting device is housed in the cover and a fluorescent lamp is attached to the other end of the cover, at least three or more protrusions are formed on the outer peripheral surface of the cylindrical portion. The protrusions are arranged so as to form a virtual screw thread having a length of 1 turn or more when the protrusions are connected, and the protrusions are arranged so as to be spaced apart from each other in the circumferential direction. The side wall of the cylindrical portion is formed with slits that are continuous with the protrusions and extend from these protrusions toward the root direction of the cylindrical portion, and these slits have end portions extending in the root direction of the cylindrical portion. Together are open in the longitudinal direction, self-ballasted fluorescent lamp device according to claim being open in communication with the inner and outer surfaces of the cylindrical portion. 2. The plurality of protrusions are arranged so that when a virtual tangent line is drawn on the outer surface of the cylindrical portion, the tangent line comes into contact with the protrusion and is in a non-contact state with respect to a surface which is a valley of a screw. The bulb-type fluorescent lamp device according to claim 1, wherein 3. The screw-in type mouthpiece screwed into the screw thread, wherein the wall surface with respect to the slit is dented and deformed,
The bulb-type fluorescent lamp device according to claim 1 or 2, wherein the deformed portion is engaged with the slit. 4. The end face of each of the protrusions, which faces the slit,
The inclined surface is formed so as to incline toward the tip end of the cylindrical portion toward the inner surface of the cylindrical portion.
A light bulb type fluorescent lamp device according to any one of claims 1 to 3.