JP6133065B2 - Halogen bulb for headlamp - Google Patents

Description

  The present invention relates to a halogen bulb used as a light source for a headlamp of an automobile.

  A halogen light bulb 101 as shown in FIGS. 4 and 5 is used as a light source of a headlamp arranged on the left and right of the front end of an automobile (see, for example, Patent Documents 1 and 2).

  That is, FIG. 4 is a side view of a conventional halogen bulb, FIG. 5 is a front view of the halogen bulb (in the direction of arrow Y in FIG. 4), and the halogen bulb 101 shown in FIG. A tip-off part 102a as a hollow sealing part with a small diameter is formed at one end (tip) of the glass bulb tube 102. The other end (base end) of the glass bulb tube 102 is also sealed to form a sealed portion 102b, and a sealed space S is formed inside the glass bulb tube 102. Is filled with an inert gas such as krypton or xenon and a small amount of halogen gas.

  Further, in the sealed space S inside the glass bulb 102, the first and second portions extending in parallel through the sealing portion 102b of the base end portion (the lower end portion in FIGS. 4 and 5) of the glass bulb 102 are provided. The second and third lead wires 103, 104, 105, the traveling filament 106 connected to these lead wires 103 to 105, the passing filament 107, and a part of the light emitted by the passing filament 107 are shielded and dimmed. A shield cup 108 and the like are accommodated. Here, one end of the traveling filament 106 is connected to the first introduction line 103, and the other end is connected to the second introduction line 104. One end of the passing filament 107 is connected to the first lead wire 103 through the shield cup 108 made of a conductive metal, and the other end is connected to the third lead wire 105. The traveling filament 106 and the passing filament 107 are made of tungsten wire, and the three lead wires 103 to 105 are made of molybdenum or the like. These lead wires 103 to 105 are connected to each other by a bridge glass 109. ing.

  As shown in FIG. 5, a contact terminal 110 is connected to one end of the passing filament 107. When the contact terminal 110 contacts the shield cup 108, one end of the passing filament 107 and the shield cup 108 are connected. Are electrically conductive, but the contact terminal 110 is offset in the radial direction by A in the figure with respect to the axis of the passing filament 107 disposed on the center line of the glass bulb 102. One end of the passing filament 107 is bent in an L shape and connected to the contact terminal 110.

  Thus, in the conventional halogen light bulb 101, the offset amount A of the contact terminal 110 (the rising dimension of the one end leg portion 107a of the passing filament) A is set to 2.0 mm.

JP 9-320544 A Japanese Utility Model Publication No. 62-186366

  In the conventional halogen light bulb 101 shown in FIGS. 4 and 5, the lead wires 103 to 105 accommodated in the sealed space S of the glass bulb 102, the traveling filament 106 and the passing filament 107, the shield cup 108, and the bridge glass. Since one end of the mount made of 109 is fixed by the sealing portion 102b, when vibration is applied to the halogen bulb 101, the entire mount resonates from the sealing portion 102b or the bridge glass 109 as shown in FIG. Since the stress generated by the resonance is concentrated on the end portion (a portion in FIG. 5) of the passing filament 107, there arises a problem that the portion is deformed or disconnected.

  The present invention has been made in view of the above problems, and an object thereof is to provide a halogen lamp for a headlamp that can improve vibration durability and prevent deformation and disconnection of a filament.

In order to achieve the above object, the present invention provides a sealed space in a glass bulb,
First, second, and third lead wires penetrating one end sealing portion of the glass bulb,
A traveling filament having one end connected to the first introduction line and the other end connected to the second introduction line;
A passing filament having one end connected to the first lead wire via a conductive shield cup and the other end connected to the third lead wire;
In the halogen lamp for headlamps configured to contact the shield cup with a contact terminal connected to one end of the passing filament,
One end of the passing filament is bent in an L shape and connected to the contact terminal, and the offset amount of the contact terminal in the radial direction from the axial center of the passing filament is 1.2 mm to 1.7 mm. It is characterized by setting.

When vibration is applied to the halogen bulb, the amount of stress concentrated at the end of the passing filament due to resonance changes depending on the offset amount of the contact terminal (rising dimension of one leg of the passing filament), and the offset amount. It was confirmed by simulation analysis that the vibration stress can be kept low when the thickness is 0 mm to 1.7 mm. However, considering the mass productivity of the filament winding equipment, it is desirable to set the offset amount of the contact terminal to 1.2 mm to 1.7 mm. Therefore, according to the present invention, one end of the passing filament is bent in an L shape and connected to the contact terminal, and the offset amount in the radial direction from the axis of the passing filament of the contact terminal is 1.2 mm to 1 mm. Since it is set to .7 mm, the vibration durability of the halogen bulb is enhanced, and deformation and disconnection of the end of the passing filament where stress is concentrated most when the halogen bulb is subjected to vibration are prevented.

1 is a side view of a halogen lamp for a headlamp according to the present invention. It is a front view (figure of the arrow X direction of FIG. 1) of the halogen light bulb for headlamps which concerns on this invention. It is a figure which shows the relationship between the offset amount of the contact terminal of halogen light bulbs, such as a headlamp, and a vibration stress cost. It is a side view of the conventional halogen lamp for headlamps. It is a front view of the conventional halogen lamp for headlamps (the figure of the arrow Y direction of FIG. 4). j

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a side view of a halogen lamp for headlamps according to the present invention, and FIG. 2 is a front view of the halogen lamp for headlamps (a view in the direction of arrow X in FIG. 1). The basic configuration is the same as that of the conventional halogen light bulb 101 shown in FIGS.

  That is, the halogen light bulb 1 according to the present invention is used as a light source of a headlamp (not shown) disposed on the left and right of the front end of an automobile, and includes a transparent glass bulb 2 made of quartz glass or hard glass. A tip-off portion 2a is formed at one end (tip) of the glass bulb 2 as a hollow sealing portion with a small diameter. The other end (base end) of the glass bulb 2 is also sealed to form a sealed portion 2b. A sealed space S is formed inside the glass bulb 2, and the sealed space S is formed in the sealed space S. Is filled with an inert gas such as krypton or xenon and a small amount of halogen gas.

  Further, in the sealed space S inside the glass bulb 2, a first end extending in parallel through the sealing portion 2b of the base end portion (the lower end portion in FIGS. 1 and 2) of the glass bulb 2 is provided. Second and third lead wires 3, 4, 5, the traveling filament 6 connected to these lead wires 3 to 5, the passing filament 7, and a part of the light emitted by the passing filament 7 are shielded and dimmed. A shield cup 8 or the like is accommodated. Here, one end of the traveling filament 6 is connected to the first introduction line 3, and the other end is connected to the second introduction line 4. One end of the passing filament 7 is connected to the first lead wire 3 through the shield cup 8 made of a conductive metal, and the other end is connected to the third lead wire 5. The traveling filament 6 and the passing filament 7 are made of tungsten wire, the three lead wires 3 to 5 are made of molybdenum or the like, and these lead wires 3 to 5 are connected to each other by a bridge glass 9. ing.

  As shown in FIG. 2, a contact terminal 10 is connected to one end of the passing filament 7. When the contact terminal 10 contacts the shield cup 8, one end of the passing filament 7, the shield cup 8, Are electrically connected, but the contact terminal 10 is offset in the radial direction by A in the figure with respect to the axis of the passing filament 7 arranged on the center line of the glass bulb 2. One end of the passing filament 7 is bent in an L shape and connected to the contact terminal 10.

  Thus, in the halogen bulb 1 configured as described above, the lead wires 3 to 5 accommodated in the sealed space S of the glass bulb 2, the traveling filament 6, the passing filament 7, the shield cup 8, and the bridge glass 9 is fixed at one end by the sealing portion 2b. Therefore, when vibration is applied to the halogen bulb 1 from the outside, the entire mount resonates from the sealing portion 2b and the bridge glass 9, and is generated by resonance. Since the stress to be concentrated on the end portion (a portion in FIG. 2) of the passing filament 7, there arises a problem that the portion is deformed or disconnected.

  When the inventor observed the state of vibration of the close filament 7 at the time of resonance with a high-speed video, the offset amount of the contact terminal 10 (rise dimension of the one end leg portion 7a of the pass filament 7) A (hereinafter referred to as “A It was found that the amplitude of the passing filament 7 is different depending on the dimension.

  Therefore, the resonance of the passing filament 7 having the maximum vibration stress was analyzed by simulation, and the correlation between the dimension A and the vibration stress ratio applied to the end of the passing filament 7 was calculated. The result is shown in FIG. The “vibration stress ratio” is a value indicating that the vibration stress at the end of the passing filament 107 of the conventional halogen bulb 101 shown in FIG. 4 and FIG. .

  As is clear from the results shown in FIG. 3, the vibration stress increases when the A dimension exceeds 1.7 mm, and the vibration stress decreases by 20% or more when the A dimension is 0 mm to 1.7 mm. Therefore, in the halogen light bulb 1 according to the present invention, the dimension A is set to 0 to 1.7 mm. In consideration of mass productivity of the filament winding equipment, it is desirable to set the dimension A to 1.2 mm to 1.7 mm.

  Based on the simulation results shown in FIG. 3, a “conventional product” having a general A dimension of 2.0 mm and a A dimension of 1.2 mm, 1.5 mm, and 1.7 mm, respectively, in a halogen lamp of 12V35 / 35W class. When the vibration endurance test was carried out for each of the samples ("Invention product 1", "Invention product 2" and "Invention product 3"), the results shown in Table 1 were obtained.

表１に示す結果より、「発明品１，２，３」は、「従来品」に比べてすれ違い用フィラメント７の端部に加わる振動応力が１７〜２３％減少し、振動耐久性が従来品の約１．４倍に向上することが分かる。

From the results shown in Table 1, the “invention products 1, 2 and 3” have 17 to 23% less vibration stress applied to the end of the passing filament 7 than the “conventional product”, and the vibration durability is the conventional product. It turns out that it improves about 1.4 times.

As described above, according to the halogen bulb 1 according to the present invention, when the dimension A is set to 1.2 mm to 1.7 mm , the most stress is concentrated when the halogen bulb 1 is subjected to external vibration. The vibration of the end of the filament 7 is kept low, the deformation and disconnection of the end are prevented, and the vibration durability of the halogen bulb 1 is enhanced.

DESCRIPTION OF SYMBOLS 1 Halogen bulb 2 Glass bulb tube 2a Glass bulb tube tip-off portion 2b Glass bulb tube sealing portion 3 First introduction selection 4 Second introduction line 5 Third introduction line 6 Traveling filament 7 Passing filament 7a One end leg of the filament for passing 8 Shield cut 9 Bridge glass 10 Contact terminal S Sealed space

Claims (1)

In the sealed space inside the glass bulb,
First, second, and third lead wires penetrating one end sealing portion of the glass bulb,
A traveling filament having one end connected to the first introduction line and the other end connected to the second introduction line;
A passing filament having one end connected to the first lead wire via a conductive shield cup and the other end connected to the third lead wire;
In the halogen lamp for headlamps configured to contact the shield cup with a contact terminal connected to one end of the passing filament,
One end of the passing filament is bent in an L shape and connected to the contact terminal, and the offset amount of the contact terminal in the radial direction from the axial center of the passing filament is 1.2 mm to 1.7 mm. Halogen bulb for headlamps characterized by setting.

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