JPH0970U - Compact low pressure discharge lamp - Google Patents

Abstract

(57) [Abstract] [Purpose] A bent compact low-pressure discharge lamp with high dimensional accuracy that can be obtained by combining individual parts to be completed as easily and inexpensively as possible. [Structure] A curved discharge tube made of glass, two electrodes hermetically sealed at both ends of the discharge tube, a filler made of mercury and a rare gas, and a phosphor coating on the inner wall of the discharge tube. Consists of a U-shaped curved tube with two longitudinal tube sections and a transverse tube section running generally perpendicular thereto, the free end of which is sealed and the individual parts are:
The longitudinal pipe sections run parallel to each other and are arranged such that the sealed pipe ends are all facing in the same direction,
And adjacent portions in a compact low-pressure discharge lamp which are connected to each other by holes adjacent to the ends of the two longitudinal tube sections so as to form a single combined discharge passage. The respective connecting holes are formed by a lateral sealing part, and the free ends of the longitudinal tube sections of all parts are closed by a crushing sealing part.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The invention consists of a bent discharge tube made of glass, composed of multiple parts, two electrodes hermetically sealed at both ends of the discharge tube, a filling of mercury and at least one noble gas and a discharge tube. With a phosphor coating on the inner wall of the tube, all parts consisting of a U-shaped curved tube with two longitudinal sections and a transverse section running roughly perpendicular to it, the free end of this longitudinal section being Sealed, the individual sections are arranged such that the longitudinal sections run parallel to each other and the sealed tube ends are all facing in the same direction, and the adjacent sections are each It relates to a compact low-pressure discharge lamp in which the holes adjoining the ends of two longitudinal tube sections are connected to each other so that a single connecting discharge path is formed.

In this case, the sealed end of the discharge vessel can have a base attached to one side, which allows the electric lamp to be mounted on a suitable luminaire.

[0003]

[Prior art]

 From German Patent Publication No. 30 11 382 and U.S. Pat. No. 3,501,662, straight tubular parts, which are arranged on one another in a number of closures, are connected by means of joints which laterally engage them. Low pressure mercury vapor discharge lamps, such as a single discharge tube, are known. In this case, the joint runs at a certain distance from each end of the tubular section in order to obtain the cold position required to regulate the mercury vapor pressure (West German Patent Publication No. 3011382). ).

With such a straight tube section, an actual bent discharge tube can be obtained by juxtaposing the tube sections and joining the tube sections with a joint. However, for manufacturing purposes, a large number of joints (to be exact, less than a straight tube section) can be sealed together with the tube section. In the case of sealing, the individual straight pipe sections must be arranged very precisely so that the aesthetic impression is completely out of the question and that they can have the required density for the next fitting of the base. Furthermore, the cold position at the end of the tube creates a dark area when the lamp discharges, which is a hindrance.

[0005] West German Patent Publication No. 3044058 proposes a curved discharge tube obtained by bending a U-shape several times with a large radius. Due to the wide bend, the phosphor application can be performed before the bending process. However, the forming of such pre-coated tubes requires special bending techniques and is extremely difficult. This is because the phosphor coating must not subsequently have any cracks or protrusions.

DE-A 31 12 878 contains as content the mercury vapor low-pressure discharge lamp with a discharge tube which is bent once or several times narrowly, in which case the discharge tube has a straight diameter. The tube bend is larger than the tube center. With this shape, the cold locations needed to control the optimum mercury vapor pressure are formed without producing dark areas. In the case of such a narrowly curved discharge tube, a uniform coating with the phosphor can only be performed after the bending process. This does not present any difficulty in the case of a single-curved discharge tube, but it is very complicated and expensive to form in the case of a several-curved discharge tube.

[0007]

[Problems to be solved by the device]

 The object of the present invention is to obtain a compact low-pressure discharge lamp, the curved discharge lamp of which can be obtained by combining the individual parts to be completed easily. This manufacturing and coating method should be as simple and inexpensive as possible, while at the same time achieving a high dimensional accuracy of the discharge vessel.

[0008]

[Means for Solving the Problems]

 According to the present invention, the compact low-voltage discharge lamp described in the superordinate concept of the utility model registration claim has holes for connecting adjacent portions formed from the lateral sealing portions 30 and 31, respectively. And the free ends of the longitudinal tube sections of all the parts 27, 28, 29 are closed by a crush seal, the discharge tube 26 consisting of three parts 27, 28, 29, the longitudinal tube section being Is characterized by forming a cylindrical body having a generally triangular cross section.

By constructing the discharge vessel from a previously bent, coated part, a considerable simplification of the manufacturing process is achieved. The number of lateral seals is less than half compared to the case of manufacturing from straight pipes (for example as described in West German Patent Publication No. 3011382). Further, the mounting of the base is simplified due to the large dimensional accuracy in manufacturing the discharge tube. The U-shaped bend is intended to obtain a "cold position" at the bend in the pipe by means of a transverse pipe section which runs generally perpendicular to the longitudinal pipe section, as already described in West German Patent Publication No. 3112878. Has a large diameter. Since no other "cold position" is required for the discharge vessel, the transverse seal can be mounted significantly adjacent to the closed end of the longitudinal tube section, so that this seal may optionally be a base sleeve. Can be covered by.

The manufacturing method can be further simplified by sealing the longitudinal tube section of all the parts with a crushing sealing part instead of the sealing part.

Due to the above construction, different configurations of the discharge tube can be obtained with different arrangements of the parts.

In one preferred embodiment of the lamp, the discharge vessel consists of two parts joined with a lateral seal. In this case, the longitudinal sections of the two parts lie in planes which run parallel to each other, the plane covering the longitudinal sections forming a tubular body with a generally triangular cross section. The lamp has a very high luminous efficiency and a particularly compact size.

Another shape of the discharge tube, different from the one described above, can be obtained by arranging the parts in a ring. In this case, this part is arranged such that the surface covering the longitudinal tube section forms a tubular body with a polygonal cross section.

[0014]

【Example】

 Next, the present invention will be described in detail with reference to the drawings.

1 to 3 show a preferred embodiment of the discharge tube 1 of a compact low-pressure discharge lamp. The discharge tube 1 is roughly composed of two parts 2, 3 which consist of a glass tube curved in a U-shape with an outer diameter of 12 mm and each of which runs parallel to each other with a distance of 3 mm. It has a long tube section of 105 mm in length. Both ends of the members 2, 3 are sealed by the crush seals 6, 7, 8, 9 with the crush seals 7, 9 of all the parts 2, 3 being the electrode holder 10 respectively. , 11 are included.

The two parts 2, 3 are in one row, a collapsing seal with electrode holders 10, 11 in the plane in which the two longitudinal tube sections of the different parts 2, 3 run parallel to each other. The parts 7 and 9 are sequentially arranged so that they are on the same side. The two parts 2, 3 are provided so that the associated discharge passages are easily formed by the lateral seals 13 forming the holes 12, which adjoin the two crush seals 6, 8 without electrode holders. Are connected to each other. The compact low-pressure discharge lamp can have a screw-in or snap base, the highly drawn edge of the base simultaneously covering the lateral seal 13.

When operating with a front choke having a cos φ of 0.34, the lamp emits a luminous flux of 850 lm at a lamp voltage of 97 V, a lamp current of 150 mA and an input of 11.5 W.

It is also possible to give the discharge tube a multiplicity of ring-shaped shapes by corresponding arrangement of the parts.

FIG. 4 shows a discharge tube 26 for a compact low-pressure discharge lamp according to the invention, in which the parts 27, 28, 29 have a longitudinal tube section of all parts 27, 28, 29. The existing planes are arranged so as to form a triangle on the same side in cross section. Also in this case, the parts 27, 28 and 29 are connected to the discharge path which is integrally connected by the lateral sealing portions 30 and 31.

[Brief description of drawings]

FIG. 1 is a perspective view of one preferred embodiment of a tight low pressure discharge lamp without a base.

FIG. 2 is a side view showing the electric lamp according to FIG.

FIG. 3 is a plan view showing the electric lamp according to FIG.

FIG. 4 is a plan view of a low-pressure discharge lamp according to the invention without a base, which has a ring-shaped arrangement of parts such that the surface covering the longitudinal tube section forms a cylinder of polygonal cross section.

[Explanation of symbols]

1, 17, 20, 26 Discharge tubes, 2, 3, 14, 1
5,16,21,22,23,27,28,29 part, 4,5 lateral tube section, 6,7,8,9 crushing sealing part, 12 hole, 13 lateral sealing part

Claims (1)

[Utility model registration claims] 1. A bent discharge vessel (26) made of glass, composed of multiple parts, two electrodes hermetically sealed at both ends of the discharge vessel (26), mercury and at least one noble gas. With a phosphor coating on the inside wall of the discharge tube (26) as well as the discharge tube, and all parts (27, 28, 29) having two longitudinal tube sections and a transverse tube section running generally perpendicular thereto. A longitudinally curved tube, the free ends of which are closed, the individual parts are such that the longitudinal tubes run parallel to each other and the closed tube ends are all oriented in the same direction. And the adjacent portions are connected to each other by holes adjacent to the ends of the two longitudinal tube sections so as to form a single connecting discharge passage. In the discharge lamp, close the adjacent Each of the holes to be connected has a horizontal sealing part (3
0,31) and all parts (27,2)
The free end of the longitudinal tube section of (8, 29) is sealed by a crush seal and the discharge tube (26) has three parts (2).
7, 28, 29) in which the surface covering the longitudinal tube section forms a tubular body with a generally triangular cross section.