JPS63308859A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a fluorescent lamp which is small-sized and has a distribution of brightness large in its effective length and has high illumination of a manuscript plane, by using a partition to divide a glass container into two units and to form a folded-back discharge path and next by providing the inner surface with a reflective film, which has opening parts on its both sides, with the partition centered. CONSTITUTION:One end of a cylindrical glass container 1 enclosed on its other end is enclosed by a stem plate 7 on which electrodes 2a, 2b are disposed. A partition 8 used to form a U-shaped discharge path with the electrodes mounted on both its ends, a reflective film 5 stuck having a prescribed central angle with an opening part 4 left and with this partition 8 centered, and a phosphor film 6 are provided inside the container 1. Since there is no space space between the adjacent discharge paths, this lamp can be made small as a whole. Further, lights formed in parallel by the reflective film 5 and on both the discharge paths are effectively used to obtain a long distribution of brightness and high illumination of a manuscript plane.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluorescent lamp, and particularly to a fluorescent lamp for reading originals in facsimiles, copying machines, and the like.

[Conventional technology]

Fig. ff13 is a plan view showing an example of a conventional fluorescent lamp of this kind disclosed in Japanese Patent Application Laid-Open No. 61-163555, and Fig. 4 is an enlarged cross-sectional view of the same. lb are two glass tubes arranged parallel to each other, and 2a.

2b is each electrode provided at one end of each glass tube 1a, lb; 3 is a glass tube joint that connects the other end of each glass tube 1a, lb to communicate these glass tubes 2a, 2b; It is. Each glass tube 1a.

1b, a reflective film 5 is deposited on the inner surface of each tube leaving an opening 4 having a constant central angle with respect to the tube axis, and a phosphor film 6 is deposited on the reflective film 5, respectively. It is equipped with

Two glass tubes 1a having the above configuration.

lb is connected to each electrode 2a through the glass tube joint 3.

One discharge path is formed with 2b as both ends. In such a fluorescent lamp, since the sealed portion of the electrode is concentrated on one side, the dark area that does not contribute to light emission is only on one side, and a luminance distribution with a long effective length is obtained. Furthermore, since it has a two-glass tube configuration and is of a reflective type, it is possible to obtain high illuminance on the document surface.

[Problem that the invention seeks to solve]

However, since conventional fluorescent lamps are composed of two glass tubes, as mentioned above, although they can obtain a long luminance due to the 4R effective length and high illuminance on the document surface,
There is a problem that the overall size tends to be large and it is difficult to reduce the size. The present invention was made in order to solve the above-mentioned problems of the conventional example.It is an object of the present invention to provide a fluorescent lamp which is compact and can obtain a long luminance distribution with a long effective length and high illuminance on the document surface. is assumed to be [-j target.

[Means for solving problems]

Therefore, in the fluorescent lamp according to the present invention, a folded discharge path is formed by a partition wall that roughly divides the inside of one glass container into two, and openings are formed on both sides of the partition wall on the inside surface of the glass container. The aim is to achieve the above objective by submerging a reflective film with .

[Effect]

In this invention, with the above configuration, a single glass container is formed with a folded discharge path by the partition wall, so there is no wasted space between adjacent discharge paths, so the overall size can be made smaller. Since the reflective film is provided with an opening centered on the partition wall, the optical output from both of the folded discharge paths can be effectively extracted, and high illuminance on the original surface can be obtained.

[Embodiments of the invention]

The present invention will be explained below based on examples. FIG. 1 shows a front view of an embodiment of a fluorescent lamp according to the present invention.
FIG. 2 shows an enlarged sectional view of the prior art example No. 3.4.
The same (equivalent) components as in the figures are represented by the same reference numerals.

(Structure) In both figures, 1 is a cylindrical glass container with one end closed, 7 is a stem plate for closing the opening at the other end, and on the stem plate 7 are each electrode 2a. , 2b are arranged. 8 divides the glass volume Bi into two, and electrodes 2a
, 2b are partition walls for creating a U-shaped discharge path with both ends. The glass container 1 has a reflective film 5 deposited on its inner surface leaving an opening 4 having a predetermined central angle around the partition wall 8, and a phosphor film deposited on the reflective film 5, respectively. 6.

(Function) With the above configuration, in this embodiment, a U-shaped discharge path is formed by the partition walls 8, so there is no wasted space between parallel discharge paths, so the overall size is small. Furthermore, by providing the reflective film 5 with openings on both sides of the partition wall 8, it is possible to effectively utilize the light from both of the parallel discharge paths, so that high illuminance on the original surface can be obtained.

In the above embodiment, the cross section of the glass container 1 is circular, but the cross section of the glass container 1 is not limited to this, and may be rectangular or other shapes. A reflective film 5 and a phosphor film 6 can also be provided on the same. Further, the partition wall 8 may be inserted into the glass container l as a partition plate, or may be formed integrally with the glass container l.

〔Effect of the invention〕

As described above, according to the present invention, a U-shaped discharge path is formed by the partition wall inside the glass container, and a reflective film having an opening around the partition wall is provided, so that the luminance distribution has a long effective length. We were able to provide a fluorescent lamp that is compact in size, provides high illuminance on the original surface, and is compact overall.

[Brief explanation of the drawing]

FIG. 1 is a front view of a fluorescent lamp according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the fluorescent lamp shown in FIG. 1. A sectional view, and FIG. 3 is a front view of an example of a conventional fluorescent lamp.
FIG. 4 is an enlarged cross-sectional view of the fluorescent lamp of FIG. 3. DESCRIPTION OF SYMBOLS 1... Glass container, 2a, 2b... Electrode, 4... Opening, 5... Reflective film, 6
...phosphor film. 8... Partition wall In each figure, the same reference numerals indicate the same or mutual components.

Claims (1)

[Claims] A partition wall having two electrodes at one end of the glass container, dividing the inside of the glass container into two and forming a U-shaped discharge path, and a partition wall with the partition wall centered on the inner surface of the glass container. and a reflective film having openings on both sides.