JPS6258561A - Fluorescent lamp and manufacture thereof - Google Patents

Abstract

PURPOSE:To increase the light output of a fluorescent lamp and also to enable to be enclosed in an envelope with high density by making the tube length in the axial direction of the bended portion located in central region longer than that of the bended portion located in outer region. CONSTITUTION:At least three portions of bended portions W1-W5 bended nearly like the letter U in the same direction are arranged parallel separated each other. To the both ends of these three portions one end of the each straight part L1-L6 is connected respectively, and the other end of the each straight part L2-L5 is connected to the both ends of the residual bended potions respectively to construct the one luminous tube, where, the tube length in axial direction of the bended portion located in central region is made longer than that of the bended portion located in outer region. Therefore the light output can be increased corresponding to the elongated tube length of the central bended portion. And if the tube lengths of each bended portion are adjusted so as the locus of the outer surface of the each bended portion becomes circular, the volume ratio can be increased when the lamp is enclosed in the envelope 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluorescent lamp and a method for manufacturing the same, and in particular,
The present invention relates to a fluorescent lamp with an improved shape of an arc tube incorporated in a compact fluorescent lamp device, and a method for manufacturing the same.

[Technical background of the invention and its problems]

In recent years, self-ballasted fluorescent lamp devices that can be directly inserted into incandescent light bulb sockets have been put into practical use, and are becoming widely used for general lighting.

As shown in FIG. 6, this self-ballasted fluorescent lamp device has an approximately incandescent light bulb shape as a whole, and a luminous tube 3 is placed inside an envelope 2 having a base 1 that is inserted into a light bulb socket 1. A lighting device for lighting the arc tube 3 is integrally housed therein.

That is, there is 1 in the glove 4, which forms part of the outer container 2.
A straight arc tube is bent into the shape of a saddle for horseback riding and accommodated in a compact space within the narrow space of the globe 4, maximizing the discharge path length (tube length) to achieve as high efficiency as possible. It is secured.

Furthermore, the curved arc tube disclosed in Japanese Patent Application Laid-Open No. 58-220333 has two U-shaped curved parts added to the saddle shape, as shown in FIGS. 7(A) and (B). Efforts are being made to extend the discharge path length.

However, in such conventional examples, the tube length of the auxiliary arc tube 3 is not necessarily sufficient, and in order to further increase the light output and efficiency, it has been desired to further increase the tube length.

[Object of the Invention] The present invention was made in view of the above-mentioned circumstances (1), and its first purpose is to increase the light output by making the tube length sufficiently long, and furthermore, the overall shape is similar to that of a globe, etc. Outer container 2
The aim is to provide a fluorescent lamp that can be housed in a high-density interior.

Furthermore, the second object of the present invention is that the above-mentioned fluorescent lamp can be easily obtained by bending a single straight tube! The aim is to provide an A-building method.

[Summary of the invention]

In order to achieve the above-mentioned object "I", the first invention provides that at least three approximately U-shaped bent portions bent in the same direction are arranged in parallel at least three places apart from each other, and these bent portions N1 are The axial length of the curved portion located on the center side is made longer than that of the curved portion located on the outside thereof, and one end of the straight portion is connected to both ends It of each of the curved portions. In addition, the other end portions of the straight portions that are adjacent to each other are connected to form one arc tube as a whole.

Further, the second invention is such that one straight light emitting ↑3 is arranged in parallel with at least three straight portions spaced apart from each other within a substantially arc-shaped curved surface, and each of the straight tubes has the following advantages: A step of bending the straight portions into an S-shaped uniform waveform such that the length of the straight portions located on the inside is longer than the length of the straight portions located on the outside, and axially intermediate portions of these straight portions. in a direction intersecting the curved direction of the curved surface including the above-mentioned waveforms, and the axial length of the curved portion located in the center of these curves is longer than that of the curved portion located on the outside thereof. There is something special about the process of bending the arc tube.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5. In addition, in the figures, the same parts are given the same reference numerals.

FIGS. 1(A) and 1(B) show the shape of a curved arc tube 10 incorporated in an embodiment of the present invention.
As shown in FIG. 1(C), a part of the outer container 11 is housed in a globe 12.

The globe 12 has an upper end formed in a dome shape with a radius R1, and a portion formed in a cylindrical shape with a radius R2, and has an inner height of 1-(to the right,
The cover 13 is connected to the upper end of a cover 13 having an inverted truncated cone shape.

A base 14 is joined to the lower end of the cover 13.

The curved arc tube 10 consists of a single tube body that emits visible light obtained by converting ultraviolet rays emitted by an arc discharge in low-pressure mercury vapor pressure with a phosphor on the glass tube wall, and has electrodes 10a at both ends. , 10b are provided.

A curved arc tube 10 (as shown in FIGS. 1A and 1B, it is three-dimensionally bent into a waveform to have a plurality of U-shaped curved parts, and has six straight parts 11). ~L6 and five U-shaped defining parts W1 to W5.These straight parts L-16 are spaced apart from each other and are arranged in parallel along the axial direction of the groove 12. A part of the outer peripheral surface of the globe 12 is arranged so as to be in circumscribed contact with the inner wall of the globe 12, as shown in FIG. 1(B).

In addition, the U-shaped dividing portion W-W5 is shown in FIG. 1 (A>(13)
As shown in the figure, the upper curved portions W1゜W, W5 are bent in a U-shape from the top downwards, and the lower curved portions 7 are bent in a U-shape from the bottom to the top. -F part curved parts W, W, W5 are spaced apart from each other and arranged in three rows in the radial direction, and a central curved part W3 located on the center side thereof. For example, it is arranged on the radial direction of the globe 12. However, this central curved portion W3 is curved into a U-shape with a radius of curvature larger than that of the curved portions W and W5 located on the outside thereof, and the axial length of the central curved portion W3 is as follows. It is longer than the outer curved portions W1 to W5, and the outer surfaces of these curved portions W1 to W5 circumscribe and cover the inner wall of the cylindrical lower portion of the globe 12. Further, the top of the central curved portion W3 circumscribes the middle portion of the inner wall of the dome-shaped upper portion of the globe 12, and its height is equal to that of the curved portions W1 on both sides. It is higher than the height of W5. These curved parts W, W5 on both sides
The top of the globe 12 is inscribed in the outer periphery of the inner wall of the dome-shaped upper part of the globe 12.

Next, a method of bending the curved arc tube 10 bent in this manner will be described.

First, as shown in Figure 2 (A>), one straight arc tube (not shown) is bent into a substantially S-shape (the bottom of the S-shape is not shown in the figure) on the same plane. 1f of three straight parts and two U-shaped lower bent parts W2 and W4 are formed.In this case, the central straight parts L-W3 and L4 are connected to the outer straight parts L and W4. Wl ・L2 or 1-5 ・W5 ・
It is formed longer than L6.

Next, the central straight portion L − of this S-shaped arc tube 10
With W3 and L4 as the center, as shown in FIG. It is curved into an arc shape, and the - part of the S-shaped straight part is formed so as to heal and circumscribe the lower inner wall of the globe 12 in the axial direction.

Thereafter, as shown in FIG. 3(B), using a bending jig 15 or the like, the S-shaped arc tube 10 is bent at the intermediate portions W, W of its straight portions.
3. It is bent again into a substantially U-shape in a direction perpendicular to the curved surface with W5 as the center, for example in FIG. 2(A), from the front surface to the back surface of the drawing.

As a result, the U-shaped upper curved portion W, W3°W5 becomes the first
As shown in Figure (B), three rows are arranged in parallel in the direction of one child. Furthermore, as shown by parallel diagonal lines in FIG. The curved portions W1 and W5 are set longer than those of the curved portions W1 and W5. Naturally, the radius of curvature of the central curved portion W3 is the same as that of the curved portions W1 on both outer sides thereof.
．． It is set much larger than that of W5.

These - F part curved parts W, W3. The bending work of W5 can be done extremely easily by using the bending jig 15 shown in FIG. 3 (A>).

The bending jig 15 is used to bend the upper curved portions W and W of the curved arc tube 10.
3. A large diameter drum 15a is provided, which is formed to have a large diameter to match the radius of curvature of the curved portion W5 located at the center of W5. At both ends of this large-diameter drum 15a, small-diameter drums 15b having a small diameter that matches the curvature radius of each of the curved parts W and W5 outside the central curved part W3 are connected to each other between the upper curved parts w, w, and w5. They are fixed in accordance with the intervals, and at each outer end of the small diameter drum 15b and both ends of the large diameter drum 15a,
The outward flanges 15G are each fixed, and by these,
As shown in FIG. 3(B), the outer periphery of the curved arc tube 10 is held.

Therefore, the S-shaped curved arc tube 10 is attached to the bending jig 15 configured in this way as shown in FIG. 3 (13), with the upper curved portions W, W3. Press W5 onto each drum 158.15b so as to distribute it back and forth, and bend it by applying a load iF to each free end in the bending direction. As a result, the curved arc tube 10 is curved as shown in FIG. 1 (Δ) (B). In other words, the partially curved sections W, W, and W5 are arranged in three rows in parallel in the radial direction, and the length of the central curved section W is longer than that of each curved section on the outside. It is longer than parts W and W5.

Therefore, if the curved arc tube 10 curved in this manner is accommodated in the globe 12 of the J envelope 11 shown by the first N(C), the 'Pl product will be reduced compared to the conventional example described above. The ratio can be increased, the tube length can be extended, and the optical output can be increased. Upper curved part W, W3. Both ends of the central curved portion W3 of W5 are connected to the curved portions W1. W5
The curved portions W1, W3, and W5 protrude in the radial direction of the globe 12 from both ends thereof, and the outer surfaces of these curved portions W1, W3, and W5 circumscribe the inner wall of the globe 12, so that the luminous flux distribution around the globe 12 is made uniform in the horizontal direction. It is possible to make the light distribution characteristic almost circular.

4 and 5 do not show other embodiments of the invention.

The difference between this embodiment and the above-mentioned embodiments, which is not shown in FIGS. 1 to 3, is that one straight arc tube is not S-shaped as shown in FIG. This is due to the fact that it is bent into a letter shape. Therefore, in this curved arc tube 20, as shown in FIG.
Straight portion L3b of the book.

Lb and two U-shaped bent portions wb and w3b are newly added, making it possible to increase the pipe length and the light output accordingly.

In addition, the upper curved portions W, W3a, W3b, and W5 are the fourth
As shown in the figures (A>(B) and (C), the central curved part Wa,
W3b is increased by one location to two locations compared to the above example,
Moreover, the radius of curvature γ of these central curved portions Wa and W3b is larger than that of each of the outer curved portions W and W5, and therefore the pipe lengths of intermediate curved portions W3a and W3b are reduced as shown in Fig. 4 (C )
According to the above, the curved parts W and W5 on both sides are b
It's getting longer.

Therefore, according to this embodiment, the light output can be further increased by extending the entire length of the curved arc tube 20, and the tube lengths of the intermediate curved portions W3a and w3b of the upper curved portion are Due to this increase, the luminous flux distribution around the curved arc tube 20 can be made uniform in the horizontal direction.

The method of bending the curved arc tube 20 constructed in this way is almost the same as that of the above-mentioned embodiment, but the bending jig is shown in FIG. 3 (A
) A large diameter drum identical to the large diameter drum 15a is newly installed in parallel to the side of this large diameter drum 15a in A 15.

That is, as shown in FIG. 5(B), a substantially W-shaped curved arc tube 20, which is curved so that the central straight part is longer than the outer straight part, is used as the globe 12. J to the same radius of curvature
After being bent, this W-shaped curved arc tube 20 is wrapped around this bending jig and bent into the η curved arc tube 20 shown in FIG. .

J3,'' In each of the two series embodiments, each curved portion W-W5 of the curved arc tube 10.20 is bent into a U-shape, and in particular, the radius of curvature of W, W, W, . Although the case where the radius of curvature for b is larger than Wl, W, has been described, the present invention is not limited to this, but for example, W
, W3. W5 may be bent into a substantially flat U shape so that the heights of the bent portions W1 to W5 are the same. This is a suitable curved arc tube when the globe is formed into a cylindrical body and the upper part is not dome-shaped but flat.

Further, in each of the above-described embodiments, the curved arc tube 10.20 is housed in the outer container, but the present invention is not limited to this. For example, the curved arc tube 10.20 is housed in the globe of the outer container. It may be exposed to the outside air without being exposed to air.

〔Effect of the invention〕

As explained above, in the first aspect of the present invention, at least three abbreviated bent portions bent in the same direction are arranged in parallel and spaced apart from each other in at least three locations, and a position M is located in the center of these bent portions. The length in the axial direction of the curved part located outside the curved part is greater than that of the curved part located outside the curved part, and one end of the straight part is connected to both ends of each of the curved parts, and The other end portions adjacent to each other were connected to form a total of U1 arc tubes.

Therefore, according to the present invention, the tube length of the curved arc tube can be increased by the length of the curved section on the central side behind the curved section bent in the same direction. , the optical output can be increased accordingly.

Furthermore, by adjusting the pipe length of each curved section 811 so that the locus connecting the outer surfaces of these curved sections becomes circular, the luminous flux distribution can be made uniform in the horizontal direction and the light distribution characteristic can be made almost circular. As a result, when the curved arc tube is housed in a cylindrical envelope, the volume ratio can be increased and the storability thereof can be improved.

According to the second invention, when bending a curved arc tube, it is sufficient to simply bend one straight arc tube, so that the curved arc tube does not have a complicated shape. Despite this, it has the effect of being easy and inexpensive to manufacture.

[Brief explanation of the drawing]

Figure 1 (A> is a perspective view of an auxiliary arc tube according to an embodiment of the present invention, Figure 1 (B) is a plan view of Figure 1 (A), Figure 1 (C)
1 is a perspective view of an envelope housing the curved arc tube shown in FIG. 1 (A), and FIG. 2 shows the bending procedure for the curved arc tube shown in FIG. is a bottom view, (B) is a plan view, and Figure 3 (A> (B) is a diagram showing the structure and method of use of the bending jig used for bending the curved arc tube shown in Figure 1. FIG. 4 is a perspective view of a bending jig, and FIG. 4 shows the shape of a curved arc tube according to an embodiment of the present invention.
) is a plan view, Fig. 5 shows the bending procedure of the curved arc tube shown in Fig. 4, (A) is a front view, (B) is a plan view, and Fig. 6 is a conventional bulb-shaped fluorescent tube. Figure 7 shows the curved arc tube of a conventional compact fluorescent lamp, (Δ) is a perspective view, and (B) is a plan view. It is. 2.11... Outer container, 3.10.20... Curved arc tube, 4.12... Globe, 13... Cover, 1
4... Cap, 15... Bending jig, W1-W5...
Curved portion, L1 to L6...straight portion. Applicant's agent Hisashi Hatano (C) /l1 (A)
(B'n vine 2 Vice (A) (B') Fig. 7

Claims (1)

[Scope of Claims] 1. At least three substantially U-shaped curved portions bent in the same direction are arranged in parallel and spaced apart from each other, and of these curved portions, the curved portion located at the center side The length in the axial direction is longer than that of the curved portion located on the outside thereof, and one end of the straight portion is connected to both ends of each of the curved portions, and the straight portions are adjacent to each other. A fluorescent lamp characterized in that its other ends are connected to form a single luminous tube. 2. The fluorescent lamp according to claim 1, wherein the curved arc tube has four approximately U-shaped curved portions that are bent in the same direction and arranged in parallel and spaced apart from each other. 3. At least three straight parts of one straight arc tube are arranged in parallel and spaced apart from each other within a substantially arc-shaped curved surface, and the length of each of the straight parts is equal to the length of the straight parts located on the outside. A step of bending each straight portion into an S-shaped uniform waveform such that the length of the straight portion located on the inside is longer than the length of the straight portion, and bending each axially intermediate portion of each of these straight portions to a curved surface including the above-mentioned waveform. a step of bending in a direction perpendicular to the direction of curving, and in such a way that the axial length of the curved portion located in the center of the curved portion is longer than that of the curved portion located on the outside; 1. A method for manufacturing a fluorescent lamp, comprising bending a curved arc tube.