JPH0623155U - Tight low pressure discharge lamp - Google Patents

Abstract

(57) [Abstract] [Purpose] A curved and tight low-pressure discharge lamp with high dimensional accuracy, which 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 the adjacent parts are connected to each other in a tight 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 lateral sealing portions, and the free ends of the longitudinal tube sections of all parts are characterized by being closed by a stem.

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 A tight low-pressure discharge lamp in which the holes adjacent to the ends of the two longitudinal tube sections are connected to each other so that a single combined 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 tube sections must be arranged very precisely so that the aesthetic impression is entirely 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.

West German Patent Publication No. 3112878 includes as a content a mercury vapor low-pressure discharge lamp having a discharge tube bent once or several times in a narrow manner, in which case the discharge tube has a straight diameter. The curved portion of the tube is larger than the central portion of the tube portion. 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 single-curved discharge tubes, but it is quite complicated and expensive to form in the case of discharge tubes that are curved several times.

[0007]

[Problems to be solved by the device]

 The object of the invention is to obtain a tight 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 tight low-pressure discharge lamp described in the superordinate concept of the utility model registration claim 1 has the holes 12 for connecting the adjacent portions 2 and 3 by the lateral sealing portion 13. It is characterized in that the free ends of the longitudinal tube sections of all parts 2, 3 formed are closed by stems 6, 7, 8, 9.

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 as compared to the case where it is manufactured from a straight pipe (for example, 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 in 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 stem 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 pipe sections of the two parts lie in planes which run parallel to each other, the plane covering the longitudinal pipe sections forming a cylinder with a generally square cross section. The lamp has a very high luminous efficiency and a particularly compact size.

The discharge tube can also consist of more than two parts, the longitudinal tube sections of the various parts lying in planes running parallel to each other. In this case, the parts do not have to form a common row at all and can also be offset from each other.

On the other hand, in the case of an electric lamp structure corresponding to the inventive idea, the discharge tube is composed of a number of parts, the longitudinal tube sections of all parts being in one plane. In this way, a flat, compact electric lamp is obtained.

Another shape of the discharge tube, which is 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 cylinder with a polygonal cross section.

[0016]

【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 according to the present invention. The discharge tube 1 is roughly composed of two parts 2, 3 which consist of a U-shaped curved glass tube with an outer diameter of 12 mm and which each have a length of 105 mm running parallel to each other with a distance of 3 mm. It has a long tube section. The members 2, 3 are sealed at both ends by stems 6, 7, 8, 9 with the stems 7, 9 of each of the parts 2, 3 having electrode holders 10, 11.

The two parts 2, 3 are in a row, the stems 7, which have the electrode holders 10, 11 in a plane in which the two longitudinal tube sections of the different parts 2, 3 run parallel to each other, 9 are sequentially arranged so that they are on the same side. The two parts 2, 3 are mutually connected by a lateral seal 13 forming a hole 12, adjoining the two stems 6, 8 without an electrode holder, so that the associated discharge passages are easily formed. Are connected. The tight low-pressure discharge lamp can have a screw-in or snap base, the raised edge of which simultaneously covers 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.

In the case of the embodiment as shown in FIG. 4, the three parts 14, 15, 16 of the discharge tube 17 likewise have two longitudinal tube sections of different parts 14, 15, 16 respectively parallel to one another. It is arranged so that it lies in the plane in which it runs. However, in this case the parts 14, 15 and 16 do not form a single column line at all, but are arranged laterally to each other and are connected to the single discharge passage by the lateral seals 18 and 19. .

FIG. 5 shows another embodiment of the electric lamp according to the present invention. The discharge tube 20 likewise consists of three parts 21, 22, 23, but these parts are arranged in parallel, the longitudinal tube sections of all parts 21, 22, 21 being in one plane. The parts 21, 22 and 23 are joined by the lateral seals 24 and 25, so that a single joining flat discharge passage is formed.

It is also possible to give the discharge tube a multiplicity of ring-shaped shapes by corresponding arrangement of the parts. FIG. 6 shows a discharge tube 26 for a tight low-pressure discharge lamp, in which case the parts 27, 28, 29 are sectional views in the plane in which the longitudinal tube sections of all parts 27, 28, 29 lie. Are arranged to form a triangle on the same side. Also in this case, the parts 27, 28 and 29 are connected to the single discharge path by the lateral sealing parts 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 showing a low-pressure discharge lamp without a base, in which longitudinal tube sections of different portions are in planes that run parallel to each other.

FIG. 5 is a plan view showing a low-pressure discharge lamp without a base, in which all the longitudinal tube sections are in one plane.

FIG. 6 is a plan view of a low-pressure discharge lamp without a base, having 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 horizontal pipe section, 6,7,8,9 stem,
12 holes, 13 horizontal sealing parts

Claims (5)

[Scope of utility model registration request] 1. A bent discharge tube (1) made of glass, made up of multiple parts, two electrodes hermetically sealed at both ends of the discharge tube (1), mercury and at least one noble gas. With a phosphor coating on the inside wall of the discharge tube (1) as well as the discharge tube (1) and all sections (2,3) have two longitudinal tube sections and a transverse tube section (4,5) which runs generally perpendicular to it.
Consisting of a U-shaped curved tube with a closed free end of this longitudinal tube section, the individual parts (2,3)
Are arranged such that the longitudinal tube sections run parallel to each other and the sealed tube ends are all facing in the same direction, and the adjoining parts (2, 3) are each two longitudinal tubes. Holes (12) adjacent to the ends of the sections join adjacent parts (2, 3) respectively in a tight low-pressure discharge lamp which is joined together to form a single-joining discharge passage. The hole (12) is formed by a lateral sealing part (13) and the free ends of the longitudinal tube sections of all parts (2,3) are sealed by stems (6,7,8,9). The feature is a tight, low-pressure discharge lamp. 2. The discharge tube (20) comprises a number of parts (21, 2).
2,23), with all parts (21,22,22)
23. A tight low-pressure discharge lamp according to claim 1, wherein the longitudinal tube section 23) lies in one plane. 3. The discharge tube (1; 17) comprises a number of parts (2, 2).
3; 14,15,16), wherein the two longitudinal tube sections of the different parts (2,3; 14,15,16) lie in planes running parallel to each other. The tight low-pressure discharge lamp according to item 1. 4. Discharge tube (1) consisting of two parts, which part is connected with a transverse seal (13), the surface covering the longitudinal tube section having a generally square cross section. A tight low-pressure discharge tube according to claim 1 or 3, which forms a body. 5. The discharge tube (26) comprises a number of parts (27, 2).
8, 29), the parts being arranged in a ring, wherein the surface covering the longitudinal tube section forms a cylinder with a polygonal cross section. Tight low-pressure discharge tube.