JPH0677146U - Low-power, low-pressure, mercury-filled compact gas discharge lamp - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a gas discharge lamp, and an object thereof is to improve the quality of the gas discharge lamp having an inner diameter of 6 mm to 16 mm. [Structure] A cold temperature chamber 5 constituting an end of a straight pipe portion 2 projects from a pipe connecting portion 3 in a longitudinal direction of a discharge vessel 1, and a length of the projecting portion is 0.15D to 0.6D. Where D is the diameter of each individual straight pipe portion, and the pipe connecting portion for connecting the cold temperature chamber is provided with a widened throat portion 6, and further, The straight pipe portion, the connecting portion of the pipe, and the cold temperature chamber are configured to have a symmetrical arrangement.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a low-power, low-pressure, mercury-encapsulated compact type gas discharge lamp in which the discharge vessels of the lamp are arranged in parallel with each other and connected through a connecting portion of a tube. The present invention relates to a device having two straight pipe portions and having a current inflow electrode at one end of each straight pipe portion.

[0002]

[Prior art]

 This type of low-pressure gas discharge lamp is generally designed compactly, and the discharge vessel and the circuit connecting elements required for lighting the lamp partially or wholly constitute one unit. There is. Such a light source, a compact fluorescent lamp, advantageously combines the good properties of incandescent lamps and fluorescent lamps, whereby it is required in modern lighting by mounting multiple light sources. It is extremely suitable for satisfying the above conditions. Therefore, the present invention relates to a structure of a discharge vessel of a gas discharge lamp of a low power type and a compact design which does not require an outer tube.

Compactly constructed low-pressure discharge lamps are known from West German patent specifications 3011 382 and 3011383. These light sources are fluorescent lamps, in which the light emitting elements of the tubes arranged in parallel are combined with a connecting tube of small diameter which provides a passage for the gas discharge. The above-mentioned lamp is characterized by having a dome-shaped cooling region at one end of each of the discharge vessels in parallel in order to partially stabilize the mercury vapor pressure when the lamp is turned on.

[0004]

[Problems to be solved by the device]

 A drawback of this lamp is related to the design geometry, which results in an unacceptable reduction of emitted light in the dome above the connecting tube that connects the ends of the straight tube. . This is because this dome-shaped portion does not contribute to discharge. Attempts to improve this undesired emission reduction are presented by the method described in West German patent specification No. 3304857, i.e. by shifting the cooling region to the current inlet side, where It is possible to make the area large enough, but it will further reduce the luminous flux, which is related to the volume of the lamp.

The configuration detailed in West German Patent Specification No. 3113878 relates to the arrangement of discharge vessels, in which the straight pipe parts folded back next to each other are bent at their corners. Is shaped by forming so as to obtain a somewhat increased cross-sectional area at, while adjacent tubes are connected throughout the cross-sectional area.

During operation of the discharge vessel, the temperature of the edge region, which has a relatively large cross-sectional area, is the lowest of the whole, so that the excess mercury collects here and at the same time it contains additional mercury. Specifies vapor pressure. The drawback of the above-mentioned discharge vessel is that the temperature in the edge region rises above the optimum value during normal operation, and as a result, the luminous efficiency of the light source remains below the maximum possible value. Is to be. All light sources constructed according to the method described so far have the following drawbacks: the maximum luminous efficiency that can theoretically be obtained is the partial emission that occurs in the light source under normal operating conditions. It has the drawback that it becomes impossible to achieve due to the mercury vapor pressure and is kept below the maximum possible value. Furthermore, this drawback is exacerbated by the considerable deformation of the illumination parameters depending on the position of the lamp during operation.

An object of the present invention is to improve the quality of a low pressure gas discharge lamp having an inner diameter of 6 mm to 16 mm, mainly by controlling the partial vapor pressure of mercury during operation to an optimum value. . The maximum luminous flux obtainable with a given electrical input of the discharge lamp is obtained with a deliberately designed arrangement, without the use of additionally applied cooling fins.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a gas discharge lamp, preferably a low-pressure fluorescent lamp, has been developed, which is intended for at least two straight-tube pieces arranged in parallel with one another, which is characteristic of this light source. Are connected by a connecting portion of the tubes designed as described above, and the connecting portion not only can serve as a discharge passage, but also has a function of controlling the temperature of the cold temperature chamber.

The present invention recognizes the following: if the cross-sectional area of the connection between the tube connection and the cold temperature chamber is sufficiently large, the thermal effect of the cooling area on the partial mercury vapor pressure is affected. The condition is based on the recognition that the connection of the pipe depends critically on the high temperature at which it is heated. The temperature rise at the joint of the tube can be reduced by forming a cooling groove in the tube wall. The ratio of the cross-sectional areas between the pipe connection and the straight pipe part is chosen to be in the range 0.5 to 1.1, the pipe connection being via the throat-shaped part, It is connected to the top of the cold temperature chamber, which projects slightly.

According to the low-pressure discharge lamp having such a structural design, the following surprising effect is obtained: the thermal condition of the discharge vessel is connected to the tube without using a large capacity cooling dome. This guarantees the partial mercury vapor pressure that is optimal from the viewpoint of luminous efficiency. Therefore, it was possible to successfully develop a lamp that is superior to other known lamp devices in terms of luminous flux.

The low-pressure discharge lamp according to the present invention, compared to all other known low-pressure gas discharge lamps intended to be used for the same purpose, has a position relative to the lamp position during operation. Is not very sensitive. Attempts have been made in the known designs to reach the optimum design based on various structural considerations, but both attempts produce a high luminous flux independent of the lamp position during operation. Not successful in getting.

The tube connection is preferably constituted by a “curved neck” formed from a straight tube material. Due to the groove provided on the surface of this recess, a more limited temperature-independent dependence on the lamp position during operation is achieved in the part of the surface which is in contact with the cooling zone. Therefore, the partial mercury vapor pressure, which is adjusted appropriately from the viewpoint of use for lighting, is maintained at a constant optimum value.

Therefore, according to the present invention, there is provided a low-power, low-pressure, mercury-encapsulated and compact gas discharge lamp in which the discharge vessels of the lamp are arranged in parallel with each other and the connecting portion of the tube is connected. An end portion of the straight pipe portion, the straight pipe portion having at least two straight pipe portions connected through The cold temperature chamber protrudes from the connecting portion of the tube in the longitudinal direction of the discharge vessel, and the length of the protruding portion is 0.15D to 0.6D, where D is the straight tube of each individual tube. The diameter of the portion, the connecting portion of the pipe for connecting the cold temperature chamber is provided with a throat portion with a widened width, and further, the straight pipe portion and the connecting portion of the pipe. Low power, characterized in that the cold temperature chambers form a symmetrical arrangement. A low-pressure, mercury-filled, compact design gas discharge lamp is provided.

[0014]

[Action]

 The present invention is based on the recognition that the length of the protruding portion must be within the range of 0.15D to 0.6D. This is because inconvenience occurs when the length of the protruding portion deviates from the above range. In other words, if the length of the protruding part exceeds the upper limit (0.6D), this protruding part can no longer participate in the discharge process, and in some cases the lamp “erases”. Such a problem occurs. On the other hand, when the length of the protruding portion is below the lower limit value (0.15D), the protruding portion cannot perform its original function, that is, the function as the cooling portion, and therefore the lamp is There is a problem that the required cooling effect cannot be achieved.

[0015]

【Example】

 A preferred arrangement of the low-pressure gas discharge lamp according to the present invention and a method for manufacturing the lamp will be described in detail in the following description with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a discharge vessel, 2 is a straight pipe piece, 3 is a tube connecting portion, 4 is an electrode, 5 is a cold temperature chamber, 6 is a throat portion, and 7 is a groove. As shown in FIG. 1, the discharge vessel 1 is composed of two straight tube pieces 2, and a gas discharge passage is secured between the pieces by a tube connecting portion 3. Gas discharge takes place between the electrodes 4.

The temperature of the cold temperature chamber 5 is controlled by the pipe joint 3, which comprises a groove 7 and is formed by molding from the material of the straight pipe piece 2. The pipe connecting portion 3 is connected to the top of the cold temperature chamber 5 via an extended throat portion 6. As a result, the size of the cold temperature chamber 5 was reduced to the minimum. By bringing the connecting position of the tube 3 closer to the end of the straight tube piece 2, the arc length of the gas discharge was increased, which further improved the light output of the lamp.

As a reference, FIGS. 2 and 3 show a method for manufacturing a light source according to the design shown in FIG. In FIG. 3, 13 is a pipe connecting portion, 15 is a cold temperature chamber, and 17 is a casting die. The starting material is a long straight glass tube cut beforehand to the required length. This glass tube is further processed in the following manner.

The central part of the glass tube is heated to the soft point. On the other hand, the additional amount of glass needed to create the tube connection 13 and the cold temperature chamber 15 is supplied by gradually expanding the tube. The straight glass tube heated to the soft point is folded back and bent, the two legs are separated to correspond to the straight tube part of the discharge vessel in parallel, and by the shaping process known in glass manufacturing. The bent pipe is placed in an appropriately shaped casting die 17, and the cold temperature chamber 15 and the bent pipe connecting portion 13 are formed by blowing gas. In the process of manufacturing the discharge vessel, the usual operations known from lamp manufacturing are applied. That is, first, a powder phosphor that converts ultraviolet radiation into visible light is applied to the inside of the tube of a fluorescent lamp, and the electrode support is brazed and the tube is evacuated.

The good properties of the lamp arrangement according to the invention are confirmed in the following examples. A soft soda glass tube with a wall of 1 mm thickness and an outer diameter of D = 12.5 mm is cut into pieces of 260 mm length. The cut glass tube is rotated and heated to a soft point by a gas, air, and oxygen disaster over a region of 110 mm from the position of both ends of the tube to a length of 40 mm inside. On the other hand, the tube length is reduced to 250 mm by swelling in the melting region (see Figure 2). The rotation of the tube is stopped and the tube is folded into a U-shape and shaped so that there is a 5 mm gap between the parallel legs. A graphite casting die heated to 400 ° C is closed at the surface of the bent tube. Then, the pipe is expanded by supplying air pressure of 1.6 bar (1.6 × 10 ⁵ N / m ² ) through the open end of the pipe (see FIG. 3), and finally, the casting die is opened, The glass tube is tempered.

The casting die and the proposed method give the following properties of the glass tube of FIG. 1, ie that the dome outside the cold temperature chamber 5 is a hemisphere with a diameter of 12.5 mm. To be The connecting portion 3 of the pipe has a starting point at a position of 5 mm measured from the top point of the dome, and a finishing point at a position 20 mm apart from this starting point. In the plane perpendicular to the longitudinal direction of this connecting part, its maximum outer diameter is 15 mm. The minimum cross-sectional area of the inner passage of the tube connection is 80 mm ² . The outer surface of the connecting portion 3 of the tube is formed in a concave-convex shape so that the semicircles having a diameter of 1 mm are in contact with each other and extend around the connecting portion.

A layer of powdered phosphor is applied to the inner wall of the glass tube and the electrode provided with the emitter and the suction tube mounted on the bead support are fixed at the free end of the glass tube by the squeezing method. . After evacuating and installing the starter and head, the compact fluorescent lamp is in its assembled state. The compact fluorescent lamp manufactured in the manner described above operates with an input current of 170 mA and an operating voltage of 60 V rms at an ambient temperature of 300 ° K by inserting an inductive ballast.

The compact fluorescent lamp manufactured by the method described above was operated according to the IEC (International Electrotechnical Commission) standard, and the main electrical and lighting characteristics were measured. The table below shows the average value of the measurement results obtained for 10 lamps, which is the lamp position at two different lighting times (the optimum position is the head up position). The worst position is the one with the head down, after being lit for 60 minutes at an ambient temperature of 25 ° C. The last two columns of the table show the rate of change of the input and the rate of change of the luminous flux. This change begins to be recorded 5 minutes after the power is turned on, and thereafter, it is recorded for 60 minutes, and is obtained by a series of measurements performed every 5 ° C within a temperature range of 15 ° C to 40 ° C. It is a thing. ─────────────────────────────────── Ue 'Iu N φ n N% φ% ───── ────────────────────────────── With the head up 60 170 8.8 616 70 95 70 ─────── ──────────────────────────── When the head is down 60 170 8.8 607 69 95 65 ────────── ────────────────────────── Note that Ue '(V) is the effective value of the voltage during lighting, and Iu (mA) is the fluorescent lamp. The effective value of the current that flows in, N (W) is the electrical input of the fluorescent lamp, φ (Lm) is the luminous flux of the fluorescent lamp, n (Lm / W) is the efficiency of the fluorescent lamp (φ / N), N% the relative rate of change of the electrical input is _{((N min / N max)} × 100), the relative rate of change of phi% light flux _{((φ min / φ max)} × 00), representing the.

The luminous flux values are improved by 10% to 20% compared to the respective values measured for fluorescent lamps of known design, and for all other operating data the known lamp It's better than it is.

[0024]

[Effect of device]

 As described above, according to the present invention, it is possible to improve the quality of a low-pressure gas discharge lamp having an inner diameter of 6 mm to 16 mm, mainly by controlling the partial vapor pressure of mercury during operation to an optimum value. it can.

[Brief description of drawings]

1 is a side view of a possible embodiment of a gas discharge lamp according to the present invention.

FIG. 2 is a diagram illustrating a method suitable for preparing the glass tube of the gas discharge lamp shown in FIG.

3 is a diagram illustrating a method suitable for preparing the glass tube of the gas discharge lamp shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Discharge container 2 ... Straight pipe part (straight pipe piece) 3 ... Pipe connecting part 4 ... Electrode 5 ... Cold temperature chamber 6 ... Throat part 7 ... Groove 13 ... Pipe connecting part 15 ... Cold temperature chamber 17 ... Casting For dice

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Jura Paloch Hungary, Hungary, 1156 Budapest, Pasco Mliget Uzza 71 (72) Tama Tortodai Hungary, 1132 Budapest, Basiuzza 16 (72) Creator Joseph Tokes Hungary, Hungary 1046 Budapest, Kapos Tasmezieri Uzza 13

Claims (1)

[Scope of utility model registration request] 1. A low-power, low-pressure, mercury-filled, compact gas discharge lamp with a compact design in which the discharge vessels (1) of the lamp are arranged in parallel with each other and with a tube connection (3). A straight pipe part having at least two straight pipe parts (2) connected to each other and having a current inflow electrode (4) at one end of each straight pipe part. The cold temperature chamber (5) constituting the end of (2) is connected to the pipe (3) in the longitudinal direction of the discharge vessel (1).
The length of the protruding part is 0.15D
From 0.6D, where D is the diameter of each individual straight pipe section, and the pipe connecting portion (3) connecting the cold temperature chamber (5) has a width of It is provided with an expanded throat portion (6), and further, the straight pipe portion (2), the pipe connecting portion (3) and the cold temperature chamber (5) form a symmetrical arrangement. A low-power, low-pressure, mercury-filled compact gas discharge lamp with a characteristic design.