JP5841790B2 - Wedge base light bulb for vehicles - Google Patents

Wedge base light bulb for vehicles Download PDF

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JP5841790B2
JP5841790B2 JP2011211886A JP2011211886A JP5841790B2 JP 5841790 B2 JP5841790 B2 JP 5841790B2 JP 2011211886 A JP2011211886 A JP 2011211886A JP 2011211886 A JP2011211886 A JP 2011211886A JP 5841790 B2 JP5841790 B2 JP 5841790B2
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filament
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bulb
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JP2013073777A (en
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井上 将一
将一 井上
辰巳 吉田
辰巳 吉田
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Stanley Electric Co Ltd
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Description

本発明は、ヘッドランプ等の車両用灯具の光源として使用されるウェッジベース電球に関するものである。   The present invention relates to a wedge-based light bulb used as a light source for a vehicle lamp such as a headlamp.

口金を有しないウェッジベース電球は、例えば車両のヘッドランプの光源として使用される(例えば、特許文献1参照)が、その一例を図6に示す。   A wedge-based light bulb that does not have a base is used, for example, as a light source of a vehicle headlamp (see, for example, Patent Document 1), and an example thereof is shown in FIG.

即ち、図6は従来のウェッジベース電球の正面図であり、該ウェッジベース電球1’のガラスバルブ2の端部には圧潰封止部2aが形成されており、ガラスバルブ2の内部には、2本の導入線3がガラスバルブ2の圧潰封止部2aを貫通して導入されている。これら2本の導入線3は、ガラスバルブ2の内部にX字状を成して収容されており、その中間部はガラスビーズ4によって互いに連結されている。そして、2本の導入線3は、ガラスビーズ4からV字状に広がるように延びており、その先端部間には弓状に湾曲するフィラメント5が張設されている。   That is, FIG. 6 is a front view of a conventional wedge base bulb, and a crushing sealing portion 2a is formed at the end of the glass bulb 2 of the wedge base bulb 1 ′. Two lead wires 3 are introduced through the crushing sealing portion 2 a of the glass bulb 2. These two lead wires 3 are housed in an X shape inside the glass bulb 2, and the intermediate portions thereof are connected to each other by glass beads 4. The two lead wires 3 extend from the glass beads 4 so as to spread in a V shape, and a filament 5 that curves in an arc is stretched between the tip portions.

上記フィラメント5は、タングステン等によって構成されており、その中間部にはコイル状に巻回されたコイル部5aが形成され、該コイル部5aの両端からは線状の脚部5bが左右に延びている。そして、フィラメント5は、その左右の脚部5bの端部が左右2本の導入線3の先端部にカシメによって固定されることによって、前述のように左右2本の導入線3の先端部間に張設されている。ここで、フィラメント5の脚部5bは、図7に示すように導入線3に対して40°〜150°の角度で固定されている。   The filament 5 is made of tungsten or the like, and a coil portion 5a wound in a coil shape is formed at an intermediate portion thereof, and linear leg portions 5b extend left and right from both ends of the coil portion 5a. ing. The filament 5 is fixed by caulking the end portions of the left and right leg portions 5b to the front end portions of the two left and right introduction lines 3, as described above. Is stretched. Here, the leg 5b of the filament 5 is fixed at an angle of 40 ° to 150 ° with respect to the lead-in line 3 as shown in FIG.

特開2008−066234号公報JP 2008-066234 A

図6に示したウェッジベース電球1’の導入線3とフィラメント5から成るマウントは、その一端がガラスバルブ2の圧潰封止部2aに固定されているため、ウェッジベース電球1’に振動が加わると圧潰封止部2aを起点として全体的に共振する。特に、フィラメント5自身が共振した場合、該フィラメント5の脚部5bの基端部(カシメのきわ部)を起点としてフィラメント5が大きく振れる。   The mount comprising the lead wire 3 and the filament 5 of the wedge base bulb 1 ′ shown in FIG. 6 is fixed to the crushing sealing portion 2a of the glass bulb 2 so that vibration is applied to the wedge base bulb 1 ′. And resonate as a whole from the crushing sealing portion 2a. In particular, when the filament 5 itself resonates, the filament 5 shakes greatly starting from the base end portion (crimped wrinkle portion) of the leg portion 5b of the filament 5.

フィラメント5の共振の大きさは、該フィラメント5を支持する導入線3の剛性に影響される。例えば、導入線3を鉄/ニッケル芯線に銅を巻いたものから鉄/ニッケル芯線にニッケルを巻いたものに変更して導入線3の剛性を高くするほど、マウントの共振が大きくなってフィラメント5の断線を招く可能性がある。   The magnitude of resonance of the filament 5 is affected by the rigidity of the lead-in wire 3 that supports the filament 5. For example, the higher the rigidity of the lead wire 3 by changing the lead wire 3 from an iron / nickel core wire wound with copper to an iron / nickel core wire wound with nickel, the greater the resonance of the mount, and the filament 5 May cause disconnection.

本発明は上記問題に鑑みてなされたもので、その目的とする処は、振動耐久性の高い車両用ウェッジベース電球を提供することにある。   The present invention has been made in view of the above problems, and an object thereof is to provide a vehicle wedge-based light bulb having high vibration durability.

上記目的を達成するため、本発明は、ガラスバルブの端部に形成された圧潰封止部を貫通してガラスバルブの内部に導入された2本の導入線の各先端部に、コイル部とその両端から延びる脚部を備えるフィラメントの前記脚部をかしめることによって、該フィラメントを前記導入線の先端部間に張設して成る車両用ウェッジベース電球において、前記フィラメントの各脚部の長さL1とコイル部の長さL2との比率(L1/L2)を20.0%〜27.7%に設定したことを特徴とする。
In order to achieve the above object, the present invention provides a coil portion at each tip of two lead wires introduced into the inside of the glass bulb through a crushing sealing portion formed at the end of the glass bulb. In a wedge base bulb for a vehicle, in which the filament is stretched between the leading end portions of the lead-in wire by caulking the leg portions having leg portions extending from both ends thereof , the length of each leg portion of the filament is The ratio (L1 / L2) between the length L1 and the length L2 of the coil portion is set to 20.0% to 27.7%.

本発明者等は、ウェッジベース電球のフィラメントの各脚部の長さL1とコイル部の長さL2との比率(L1/L2)を最適化、具体的には比率(L1/L2)を20.0%〜27.7%に設定することによって、基準面からフィラメント中心までの長さを変えることなくフィラメントの脚部の基端部(カシメのきわ部)に働く応力を減少させ、結果的にフィラメントの断線を防いで当該ウェッジベース電球の振動耐久性を高めることができることを実験的に見出した。ここで、フィラメントのコイル部長さとは、真っ直ぐに延ばした状態の実際の長さであり、コイル部の形状(直線状や弓状)には無関係である。
The present inventors have optimized the ratio (L1 / L2) between the length L1 of each leg of the filament of the wedge-based light bulb and the length L2 of the coil , specifically, the ratio (L1 / L2) is 20 By setting to 0.0% to 27.7%, the stress acting on the base end portion of the filament leg (crimping wrinkle portion) is reduced without changing the length from the reference plane to the filament center. In addition, it was experimentally found that the filament durability can be prevented and the vibration durability of the wedge-based bulb can be improved. Here, the coil part length of the filament is an actual length in a state where the filament part is straightly extended, and is irrelevant to the shape (straight line or arcuate shape) of the coil part.

本発明に係る車両用ウェッジベース電球の正面図である。It is a front view of the wedge base bulb for vehicles concerning the present invention. 本発明に係る車両用ウェッジベース電球のマウントの振動を示す説明図である。It is explanatory drawing which shows the vibration of the mount of the wedge base light bulb for vehicles which concerns on this invention. 図2のA部拡大詳細図である。FIG. 3 is an enlarged detail view of a part A in FIG. 2. (a)〜(c)は車両用ウェッジベース電球のフィラメントのコイル部長さを説明する図である。(A)-(c) is a figure explaining the coil part length of the filament of the wedge base light bulb for vehicles. フィラメントの(脚部長さ/コイル部長さ)の比率を変えて振動耐久性を試験した結果を示す図である。It is a figure which shows the result of having tested the vibration durability by changing the ratio of the (leg part length / coil part length) of a filament. 従来の車両用ウェッジベース電球の正面図である。It is a front view of the conventional wedge base light bulb for vehicles. 従来の車両用ウェッジベース電球のフィラメント脚部の導入線に対する固体角度範囲を示す部分斜視図である。It is a fragmentary perspective view which shows the solid angle range with respect to the introduction line of the filament leg part of the conventional wedge base light bulb for vehicles.

以下に本発明の実施の形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図1は本発明に係る車両用ウェッジベース電球の正面図であり、その基本構成は図6に示した従来の車両用ウェッジベース電球1’のそれと同じであるが、フィラメント5の(脚部長さ/コイル部長さ)の比率だけが異なる。従って、以下、本発明に係る車両用ウェッジベース電球1の構成についての説明は省略し、図1においては図6に示したものと同一要素には同一符号を付している。   FIG. 1 is a front view of a vehicular wedge base light bulb according to the present invention, and its basic configuration is the same as that of the conventional vehicle wedge base light bulb 1 ′ shown in FIG. Only the ratio of (coil part length) is different. Therefore, the description of the configuration of the vehicle wedge base light bulb 1 according to the present invention will be omitted below, and the same elements as those shown in FIG.

ウェッジベース電球1のフィラメント5と導入線3から成るマウントの全体の共振を小さく抑えるためには、マウントの長さを短くすれば良いが、図1に示す基準面からフィラメント5中心までの長さLCLはECE規格Reg.37で規格化されているため、マウントの長さを単純に短くすることはできない。   In order to suppress the overall resonance of the mount composed of the filament 5 and the lead-in wire 3 of the wedge-based light bulb 1, the length of the mount may be shortened, but the length from the reference plane shown in FIG. LCL is an ECE standard Reg. 37, the mount length cannot be simply shortened.

ここで、マウントの振動について図2及び図3に従って説明する。   Here, the vibration of the mount will be described with reference to FIGS.

図2は本発明に係る車両用ウェッジベース電球のマウントの振動を示す説明図、図3は図2のA部拡大詳細図であり、導入線3を剛性の高い材料で構成した場合、図2に示すようにマウント全体の共振が大きくなる。この共振の様子を詳しく観察すると、導入線3の先端カシメ部の振幅λ1は殆ど変化せず、フィラメント5がその脚部5bの基端部(カシメのきわ部)を起点として振幅λ2(>λ1)で大きく振れていることが判明した。   FIG. 2 is an explanatory view showing the vibration of the mount of the vehicle wedge base light bulb according to the present invention. FIG. 3 is an enlarged detail view of part A of FIG. 2, and when the lead-in wire 3 is made of a highly rigid material, FIG. The resonance of the entire mount increases as shown in FIG. When the state of this resonance is observed in detail, the amplitude λ1 of the leading caulking portion of the lead-in wire 3 hardly changes, and the filament 5 has an amplitude λ2 (> λ1) starting from the base end portion (the caulking wrinkle portion) of the leg portion 5b. ) Was found to swing significantly.

そこで、フィラメント5の脚部5bの基端部(カシメのきわ部)に働く応力を片持ち梁の理論に基づいてシミュレーションした。   Then, the stress which acts on the base end part (crimping wrinkle part) of the leg part 5b of the filament 5 was simulated based on the theory of a cantilever.

ウェッジベース電球1の導入線3とフィラメント5から成るマウントは、その一端がガラスバルブ2の圧潰封止部2aに固定されているため、ウェッジベース電球1に振動が加わると圧潰封止部2aを起点として全体的に共振する。特に、フィラメント5自身が共振した場合、該フィラメント5の脚部5bの基端部(カシメのきわ部)を起点としてフィラメント5が大きく振れる。このとき、フィラメント5に掛かる振動応力σは次式で表わされる。   The mount comprising the lead wire 3 and the filament 5 of the wedge base bulb 1 has one end fixed to the crushing sealing portion 2a of the glass bulb 2, so that when the wedge base bulb 1 is subjected to vibration, the crushing sealing portion 2a is removed. Resonates entirely as a starting point. In particular, when the filament 5 itself resonates, the filament 5 shakes greatly starting from the base end portion (crimped wrinkle portion) of the leg portion 5b of the filament 5. At this time, the vibration stress σ applied to the filament 5 is expressed by the following equation.

σ=(集中荷重P)×(重力加速度g) … (1)
従って、上記(1)式より集中荷重Pは次式によって求められる。
σ = (concentrated load P) × (gravity acceleration g) (1)
Therefore, the concentrated load P is obtained from the above equation (1) by the following equation.

P=σ/(重力加速度g) … (2)
ところで、フィラメント5の脚部5bの基端部(図3のB部)に働く応力は、片持ち梁の最大応力σmaxであり、片持ち梁の最大応力σmaxは一般的に次式によって求められる。
P = σ / (gravity acceleration g) (2)
Incidentally, the stress acting on the base end portion (B portion in FIG. 3) of the leg portion 5b of the filament 5 is the maximum stress σmax of the cantilever beam, and the maximum stress σmax of the cantilever beam is generally obtained by the following equation. .

σmax(kg/mm)=集中荷重(kg)×梁の長さ(mm)×断面係数(mm
上式を図2及び図3に示すマウントに当て嵌めると、集中荷重=(2)式によって求められるP、梁の長さ=フィラメント5の脚部5bの長さL1(図3参照)となる。
σmax (kg / mm 2 ) = concentrated load (kg) × beam length (mm) × section modulus (mm 3 )
When the above equation is applied to the mount shown in FIGS. 2 and 3, the concentrated load = P obtained by the equation (2), the length of the beam = the length L1 of the leg 5b of the filament 5 (see FIG. 3). .

従って、フィラメント5の脚部5bの基端部に働く応力σmaxは、
σmax=P×L/2 … (3)
によって求められる。
Therefore, the stress σmax acting on the base end portion of the leg 5b of the filament 5 is
σmax = P × L / 2 (3)
Sought by.

ここで、フィラメント5に掛かる振動応力σ、集中荷重P及び断面係数Zはそれぞれ次式によって求められる。   Here, the vibration stress σ, the concentrated load P, and the section modulus Z applied to the filament 5 are obtained by the following equations, respectively.

σ(N)=フィラメント重量(g)×10-3×19.74×(振動周波数(Hz))
×振幅(mm)×10-3 … (4)
P(kg)=σ(N)/9.8 … (5)
Z(mm)=π×(フィラメント径(mm))/32 … (6)
以上のシミュレーションにより、本発明者等は、ウェッジベース電球1のフィラメント5の(脚部長さ/コイル部長さ)の比率(L1/L2)を最適化、具体的には比率(L1/L2)を20.0%〜27.7%に設定することによって、基準面からフィラメント5までの長さを変えることなくフィラメント5の脚部5bの基端部(カシメのきわ部)に働く応力を減少させ、結果的にフィラメント5の断線を防いで当該ウェッジベース電球1の振動耐久性を高めることができることを実験的に見出した。
σ (N) = filament weight (g) × 10 −3 × 19.74 × (vibration frequency (Hz))
× Amplitude (mm) 2 × 10 -3 (4)
P (kg) = σ (N) /9.8 (5)
Z (mm 3) = π × ( filament diameter (mm)) 3/32 ... (6)
Through the above simulation, the present inventors optimized the ratio (L1 / L2) of the filament 5 of the wedge-based light bulb 1 (L1 / L2), specifically, the ratio (L1 / L2). By setting to 20.0% to 27.7%, the stress acting on the base end portion (crimping wrinkle portion) of the leg 5b of the filament 5 is reduced without changing the length from the reference surface to the filament 5. As a result, the inventors have experimentally found that the filament 5 can be prevented from being broken and the vibration durability of the wedge-based light bulb 1 can be improved.

ここで、フィラメント5のコイル部5aの長さL2とは、該コイル部5aを真っ直ぐに延ばした状態の実際の長さであり、コイル部5aの形状(直線状や弓状)には無関係である。例えば、フィラメント5が図4(a)に示すように弓状に湾曲している場合、そのコイル部5aの長さはフィラメント5を図4(b),(c)に示すように直線状に延ばしたときの長さである。   Here, the length L2 of the coil portion 5a of the filament 5 is an actual length in a state where the coil portion 5a is straightened, and is irrelevant to the shape (straight line or arcuate shape) of the coil portion 5a. is there. For example, when the filament 5 is curved in an arch shape as shown in FIG. 4A, the length of the coil portion 5a is linear with the filament 5 as shown in FIGS. 4B and 4C. It is the length when extended.

次に、12V/16Wのウェッジベース電球1において、フィラメント5の(脚部長さ/コイル部長さ)の比率(L1/L2)を変化させて振動耐久性試験を行った結果を図5に示す。図5における振動耐久性は、導入線3の材料の剛性を高めたウェッジベース電球1の振動耐久性を100%として表示している。   Next, in the 12V / 16W wedge-based light bulb 1, the result of the vibration durability test by changing the ratio (L1 / L2) of (leg part length / coil part length) of the filament 5 is shown in FIG. The vibration durability in FIG. 5 is indicated by assuming that the vibration durability of the wedge-based light bulb 1 in which the rigidity of the material of the lead-in wire 3 is increased is 100%.

又、表1に従来例1,2として(脚部長さ/コイル部長さ)の比率(L1/L2)を30.8%、28.5%に設定した例を示し、本発明例1,2として27.7%(上限値)、20.0%(下限値)に設定した例を示す。ここで、本発明における(脚部長さ/コイル部長さ)の比率(L1/L2)の上限値27.7%は、振動耐久性向上の効果が得られる限界の値であり、下限値20.0%は、カシメ工程で導入線3とフィラメント5をカシメる際においてフィラメント5の脚部5bがコイル部5aに干渉しないための必要最小限の値であり、脚部5bの長さが1.3mmよりも短くなると、カシメる際にコイル部5aが潰れてしまい、製品として成り立たなくなる。   Table 1 shows examples in which the ratio (L1 / L2) of (leg length / coil length) is set to 30.8% and 28.5% as conventional examples 1 and 2, respectively. As an example, 27.7% (upper limit) and 20.0% (lower limit) are set. Here, the upper limit value 27.7% of the ratio (L1 / L2) of (leg length / coil length) in the present invention is a limit value at which the effect of improving the vibration durability can be obtained. 0% is a necessary minimum value for preventing the leg portion 5b of the filament 5 from interfering with the coil portion 5a when the lead wire 3 and the filament 5 are caulked in the caulking process, and the length of the leg portion 5b is 1. If the length is shorter than 3 mm, the coil portion 5a is crushed when crimped, and the product cannot be realized.

Figure 0005841790
而して、図5に示す結果から明らかなように、本発明のようにフィラメント5の(脚部長さ/コイル部長さ)の比率(L1/L2)を20.0%〜27.7%に設定することによって、当該ウェッジベース電球1の振動耐久性を170%に高めることができるという効果が得られる。
Figure 0005841790
Thus, as is apparent from the result shown in FIG. 5, the ratio (L1 / L2) of the (leg part length / coil part length) of the filament 5 to 20.0% to 27.7% as in the present invention. By setting, the effect that the vibration durability of the wedge-based light bulb 1 can be increased to 170% can be obtained.

1 ウェッジベース電球
2 ガラスバルブ
2a ガラスバルブの圧潰封止部
3 導入線
4 ガラスビーズ
5 フィラメント
5a フィラメントのコイル部
5b フィラメントの脚部
L1 フィラメントの脚部の長さ
L2 フィラメントのコイル部の長さ
DESCRIPTION OF SYMBOLS 1 Wedge base light bulb 2 Glass bulb 2a Glass bulb crushing sealing part 3 Lead wire 4 Glass bead 5 Filament 5a Filament coil part 5b Filament leg L1 Filament leg length L2 Filament coil length

Claims (1)

ガラスバルブの端部に形成された圧潰封止部を貫通してガラスバルブの内部に導入された2本の導入線の各先端部に、コイル部とその両端から延びる脚部を備えるフィラメントの前記脚部をかしめることによって、該フィラメントを前記導入線の先端部間に張設して成る車両用ウェッジベース電球において、
前記フィラメントの各脚部の長さL1とコイル部の長さL2との比率(L1/L2)を20.0%〜27.7%に設定したことを特徴とする車両用ウェッジベース電球。
The filament comprising the coil portion and the leg portion extending from both ends of each of the two lead wires introduced into the glass bulb through the crushing sealing portion formed at the end portion of the glass bulb. In a vehicle wedge-based light bulb in which the filament is stretched between the leading end portions of the lead-in wire by caulking the leg portion,
A wedge base bulb for a vehicle , wherein a ratio (L1 / L2) between a length L1 of each leg portion of the filament and a length L2 of the coil portion is set to 20.0% to 27.7%.
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