JP2624653B2 - Manufacturing method of annular fluorescent lamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped fluorescent lamp, and more particularly to a sectional shape thereof.

[Conventional technology]

For example, as described in Japanese Patent Publication No. 50-32758 and Japanese Patent Publication No. 51-11876, an annular fluorescent lamp having a non-circular cross-sectional shape is known. Other than that, the idea of simply making the cross-sectional shape flat like an ellipse has already been known.

In each case, the light distribution is changed by making the cross-sectional shape non-circular to increase the illuminance.

[Problems to be solved by the invention]

In the case of a conventional technique, for example, a ring-shaped fluorescent lamp having a non-circular cross-section with a recess formed in a part of the cross-section, it is extremely difficult to process the recess into a predetermined size, and practical use has not been possible. or,
The position of the dent is not always constant in terms of the combination with the fixture, and in the mounted state, the dent has been placed at a position completely opposite to the intention of the designer, so this lamp has practicality. I was missing.

Also, the technology of simply flattening the cross section has been around for a long time,
Although it is publicly known, this technology does not quantify the specific shape and not only the effect obtained accordingly, but also the performance of the fluorescent lamp itself and the combination with the fixture. Because there is no indication on the suitability and the method for obtaining the intended cross-sectional shape,
This has not been put to practical use.

Accordingly, an object of the present invention is to provide a ring-shaped fluorescent lamp which has solved the above-mentioned problems.

[Means for solving the problem]

In order to solve these problems, the method of making the lamp, the completed shape, the compatibility with the fixtures, the illuminance up effect, etc. are examined concretely one by one, and the most effective cross-sectional shape is determined. In addition, we pursued how to make it and made it practical. The targets were: (1) A shape that can be processed in the current tube bending process.

(2) The completed lamp must be compatible with the suspension equipment currently on the market.

(3) Compared with conventional lamps, it has a clear illuminance up effect.

As a shape that satisfies these three aims, basically, each cross section is almost a bulb shape in a vertical direction with respect to a horizontal plane including a circle formed by connecting the center points of each cross section of the lamp.
And it was made into flat shape. More specifically, it is longer (diameter) in the horizontal plane direction and shorter (shorter diameter) in the vertical plane direction so as to be compatible with the suspension equipment already on the market and not to impair the performance of the lamp itself. , A flat section, and the ratio was 1.1 ≦ y / x ≦ 1.4.

[Action]

As a result, the starting performance and the total luminous flux of the lamp were exactly the same as those of the conventional circular cross section, the life was the same, and the illuminance on the lower surface could be increased by 10% on average.

It was confirmed that the reason why the illuminance up was made possible was that the light distribution characteristics changed and the illuminance on the underside was increased because the luminous area of the lamp viewed from the floor surface became large when the fixture was mounted.

〔Example〕

An embodiment according to the present invention will be described below with reference to the drawings. The test sample is FCL30W conforming to JIS-C7601. FIG. 1 shows its appearance. It is an elliptical cross section with a ring inner diameter of 165 mm and a reference pipe diameter of 31 mm. The performance of the lamp of the present invention was compared based on the performance of the lamp having a circular cross section of the lamp 1.

FIG. 3 shows a flat cross section according to the present invention, in which a ratio y / x of the diameter y of the tube diameter and the minor axis x was trial manufactured for 1.0, 1.1, 1.2, 1.3, 1.4 and 1.5. The specific dimensions at this time are as shown in the table below.

To explain how to make this cross section,
3 to 11.0mmφ, 29.0mmφ, 27.5m in order of prototype No.
mφ, 26mmφ, 25mmφ, 24mmφ were used. After sealing the mounts containing the electrodes at both ends of the glass tube, the glass tube was heated and softened in a heating furnace and wound around a winding drum. At this time, the shape of the drum 5 is as shown in FIG. 5. , 12.5 mm, 12 mm to determine the minor axis x dimension of the cross-sectional shape, and for the diameter y dimension, at the time of bending the tube, fill the glass tube 1 with at least 1 atm of N ₂ gas to achieve the predetermined dimension. Molded by swelling up to The performance evaluation of the lamp 1 thus produced and the results of the combination with the lamp 2 are as shown in the table below.

As a result, it was confirmed that y / x was required to be 1.1 or more as a necessary condition for clearly obtaining the illuminance up effect. Also, when the x dimension is too small, the starting voltage increases and x = 24 mm It turned out that the starting voltage exceeded 95V, so that it could not be put to practical use. In addition, it was found that when the y-dimension is 36 mm or more, the number of compatible instruments 2 is reduced, and this also hinders practical application. From these experimental results, it was found that a good result was obtained when the y / x ratio was 1.1 or more and 1.4 or less.

〔The invention's effect〕

As described above, according to the present invention, it is possible to combine with a hanging device currently on the market and to increase the lower surface illuminance by about 10%.

[Brief description of the drawings]

FIG. 1 is a front view of a ring-shaped fluorescent lamp according to the present invention, FIG. 2 is a view showing a state of being mounted on an appliance, FIG. 3 is a view showing a cross-sectional shape, FIG. FIG. 5 is a view showing the shape of a tube bending drum when making a lamp. 1 ... Ring-shaped fluorescent lamp, 2 ... Appliance, 3 ... Holder, 5 ... Winding drum, θ ... Flat area range.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-39127 (JP, A) JP-A-57-88643 (JP, A) Fully open 58-134856 (JP, U) Really open Showa 56- 138465 (JP, U) Japanese Patent Publication No. 48-21279 (JP, B1) Japanese Patent Publication No. 39-1592 (JP, B1)

Claims (1)

(57) [Claims] After the glass tube has been heated and softened, it is wound around a drum having a predetermined shape, and nitrogen gas is sealed in the glass tube at a pressure of at least 1 atm so that the annular fluorescent lamp has a flat cross-sectional shape. At least the main range of the discharge length is a flat cross section satisfying 1.1 ≦ y / x ≦ 1.4 when the minor axis is x and the major axis is y, and x> 24 mm and y <36 mm. Manufacturing method.