JPH09306428A - Discharge lamp and manufacture thereof - Google Patents
Discharge lamp and manufacture thereofInfo
- Publication number
- JPH09306428A JPH09306428A JP14988296A JP14988296A JPH09306428A JP H09306428 A JPH09306428 A JP H09306428A JP 14988296 A JP14988296 A JP 14988296A JP 14988296 A JP14988296 A JP 14988296A JP H09306428 A JPH09306428 A JP H09306428A
- Authority
- JP
- Japan
- Prior art keywords
- envelope
- electrode
- closed
- sealed
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Discharge Lamp (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は放電灯、特に、新規な小
型チップレス放電灯とその製造方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp, and more particularly to a novel small chipless discharge lamp and an improvement in its manufacturing method.
【０００２】[0002]
【従来の技術】従来の放電灯(B)は、図４(a)に示すよう
に、両端が開放した外囲器(1')の側壁にチップ管(9')を
直角に接続し、外囲器(1')の開口(8')から電極(2')(3')
をそれぞれ挿入して外囲器(1')に対する電極(2')(3')の
相対位置と電極(2')(3')同士の方向を定めてセットし、
続いて外囲器(1')の両端を非酸化性雰囲気内で同時に或
いは交互に加熱して軟化させ、外囲器(1')の両端をピン
チ封止して電極(2')の封着用箔(2c')及び電極(3')の封
着用箔(3c')を封着部(4')(5')にそれぞれ埋設し、外囲
器(1c')の両端の封着部(4')(5')に電極(2')(3')を固定
し、然る後チップ管(9')から外囲器(1c')内の気体を吸
引排気して略真空状態にし、続いて必要なガスを外囲器
(1c')内に充填し、最後にチップ管(9')を封切するとい
う方法が採用されていた。2. Description of the Related Art In a conventional discharge lamp (B), as shown in FIG. 4 (a), a tip tube (9 ') is connected at a right angle to a side wall of an envelope (1') whose both ends are open, From the opening (8 ') of the envelope (1') to the electrodes (2 ') (3')
Insert each by setting the relative position of the electrode (2 ') (3') and the direction of the electrodes (2 ') (3') relative to the envelope (1 '),
Subsequently, both ends of the envelope (1 ') are simultaneously or alternately heated in a non-oxidizing atmosphere to be softened, and both ends of the envelope (1') are pinched to seal the electrode (2 '). The sealing foil (3c ') of the wearing foil (2c') and the electrode (3 ') is embedded in the sealing portions (4') and (5 '), respectively, and the sealing portions on both ends of the envelope (1c') are sealed. Fix the electrodes (2 ') (3') on (4 ') (5'), and after that, suck and exhaust the gas in the envelope (1c ') from the tip tube (9') to obtain a substantially vacuum state. And then supply the required gas to the enclosure.
A method of filling the inside of (1c ′) and finally sealing off the tip tube (9 ′) was adopted.
【０００３】この場合、電極(2')(3')の電極本体(2a')
(3a')には非蒸発性ゲッタ(2e')(3e')が設けてあるが、
このゲッタ(2e')(3e')はチップ管(9')の封切後、ゲッタ
(2e')(3e')の活性工程で初めて加熱されて活性化される
ものであり、封着段階では活性化すべきでないので、封
着時の熱によって活性化されないよう封着加熱部分から
出来るだけ遠くに離しておく必要がある。その結果、封
着部(4')(5')からゲッタ(2e')(3e')が取着されている電
極本体(2a')(3a')までのそれだけ距離(K')が長くなり全
体形状が長大になるという欠点がある。しかも、封着工
程でゲッタ(2e')(3e')が活性化されないので、チップ管
(9')の封切後、改めてゲッタ(2e')(3e')を所定の温度ま
で加熱して活性化させねばならないので、製造工程が複
雑になるという問題がある。In this case, the electrode body (2a ') of the electrodes (2') (3 ')
Non-evaporable getter (2e ') (3e') is provided in (3a '),
This getter (2e ') (3e') is a getter after the tip tube (9 ') is closed.
(2e ') (3e') is activated by being heated for the first time in the activation process, and should not be activated at the sealing stage, so it can be done from the sealing heating part so that it is not activated by the heat during sealing. Only need to be far away. As a result, the distance (K ') from the sealing part (4') (5 ') to the electrode body (2a') (3a ') to which the getter (2e') (3e ') is attached is longer. There is a drawback that the overall shape becomes long. Moreover, since the getters (2e ') and (3e') are not activated in the sealing process, the tip tube
After the opening of (9 ′), the getters (2e ′) and (3e ′) have to be heated again to a predetermined temperature to be activated, which causes a problem that the manufacturing process becomes complicated.
【０００４】また、チップ管(9')の封切跡である封切跡
(10')が外囲器(1c')の側壁に残り、外囲器(1c')に歪み
が残りやすく外囲器(1c')の破損の原因となり易いとい
う欠点や、封切跡(10')により、外囲器(1')から出光す
る光が散乱されて配光性能が低下するというような問題
があった。また、大量生産にあっては電極(2')(3')の先
端間の相対距離を合わせる事は困難であってセット時間
がかなり掛り、生産数量の抑制要因となっていた。[0004] Further, the seal trace which is the seal trace of the tip tube (9 ')
(10 ') remains on the side wall of the envelope (1c'), and the envelope (1c ') is liable to be distorted. There is a problem that the light emitted from the envelope (1 ') is scattered by the') and the light distribution performance is deteriorated. Also, in mass production, it was difficult to match the relative distances between the tips of the electrodes (2 '), (3'), and it took a considerable amount of time to set them, which was a factor to suppress the production quantity.
【０００５】[0005]
【発明が解決しようとする課題】本発明は大量生産にも
適し、しかもチップ管を必要とせず、外囲器の側壁にチ
ップ管の封切跡が生じない放電灯と、ゲッタの活性化工
程を省略する事の出来る該放電灯の新規な製造方法の開
発をその解決課題とする。The present invention is suitable for mass production, does not require a tip tube, and has a discharge lamp that does not cause a chip tube cut mark on the side wall of an envelope, and a getter activation step. The problem to be solved is the development of a new manufacturing method of the discharge lamp which can be omitted.
【０００６】[0006]
【課題を解決するための手段】『請求項１』の放電灯
(A)は「両端が封着され、その側壁にチップ管(9')の封
切跡(10')がなく側壁全面が平滑な円筒面となっている
外囲器(1)と、前記封着部(4)(5)内に埋設されている封
着用箔(2c)(3c)と、前記封着用箔(2c)(3c)から外囲器
(1)内に突出しており、封着部(4)(5)に近接し且つゲッ
タ(2e)(3e)が取着されている電極本体(2a)(3a)と、封着
用箔(2c)(3c)から外部に突出している外部リード(2d)(3
d)とで構成されている」事を特徴とする。[Means for Solving the Problems] Discharge lamp according to claim 1.
(A) is `` envelope (1) whose both ends are sealed, and the side wall has a smooth cylindrical surface without the sealing mark (10 ') of the tip tube (9') on the side wall, Sealing foil (2c) (3c) embedded in the attachment parts (4) and (5), and the sealing foil (2c) (3c) to the envelope.
(1) the electrode body (2a) (3a), which protrudes inside, is close to the sealing parts (4) and (5) and to which the getters (2e) and (3e) are attached, and the sealing foil (2c ) (3d) and external leads (2d) (3
It is composed of d) and ”.
【０００７】これによれば、ゲッタ(2e)(3e)を有する電
極本体(2a)(3a)が封着部(4)(5)に近接させて設けられて
いるので、放電灯(A)の全長を短くする事が出来る。ま
た、その側壁に封切跡(10')がないので、配光性能も優
れ、光学系など精密照明の分野にも適用出来、その応用
範囲が各段に向上するものである。According to this, since the electrode bodies (2a) (3a) having getters (2e) (3e) are provided close to the sealing parts (4) (5), the discharge lamp (A) The overall length of can be shortened. Further, since there is no seal mark (10 ') on the side wall, the light distribution performance is excellent, and it can be applied to the field of precision illumination such as optical systems, and the range of its application will be further improved.
【０００８】『請求項２』は本発明に係る放電灯(A)の
製造方法（図１(a)〜(f)参照）で「一端が開放され、他
端が閉塞されている外囲器(1)に、所定長さ(M)の一対の
電極(2)(3)を開口(8)側から挿入した後、前記外囲器(1)
内を略真空状態にしてから必要ガスを充填し、然る後前
記開口端(8)を閉塞して外囲器(1)の両閉塞端(6)(8a)間
の距離(S)を所定の長さにし、次いで外囲器(1)を立てて
一方の電極(3)を前記外囲器(1)の閉塞端(6)に当接さ
せ、この状態で下側の閉塞端(6)側を封着して下側の電
極(3)を封着部(5)に固定し、次に外囲器(1)を反転させ
て他の電極(2)を他の下側の閉塞端(8a)に移動させ、前
記電極(2)の端部を下側の閉塞端(8a)と一致させ、然る
後前記下側の閉塞端(8a)を封着して他の電極(2)を前記
封着部(8a)に固定し、次いで外囲器(1)の端部を切除す
る」事を特徴とする。"Claim 2" is a method of manufacturing a discharge lamp (A) according to the present invention (see FIGS. 1 (a) to 1 (f)), wherein "one end is open and the other end is closed. In (1), after inserting a pair of electrodes (2) (3) of a predetermined length (M) from the side of the opening (8), the envelope (1)
After making the inside a substantially vacuum state, it is filled with a necessary gas, and then the opening end (8) is closed to reduce the distance (S) between both closed ends (6) (8a) of the envelope (1). The envelope (1) is erected to a predetermined length, and one electrode (3) is brought into contact with the closed end (6) of the envelope (1), and in this state, the lower closed end ( 6) side is sealed and the lower electrode (3) is fixed to the sealing part (5), then the envelope (1) is inverted and the other electrode (2) is fixed to the other lower side. Move to the closed end (8a), match the end of the electrode (2) with the lower closed end (8a), and then seal the lower closed end (8a) to another electrode. (2) is fixed to the sealing portion (8a), and then the end of the envelope (1) is cut off. "
【０００９】また『請求項３』は本発明に係る放電灯
(A)の製造方法の他の方法（図２(a)〜(g)参照）で「一
端が開放され、他端が閉塞されている外囲器(1)に、所
定長さ(M)の一対の電極(2)(3)の一方(2)を開口(8)側か
ら挿入して前記投入した一方の電極(3)を外囲器(1)の閉
塞端(6)に当接させると共に前記外囲器(1)内を略真空状
態或いは非酸化性雰囲気にし、然る後外囲器(1)の閉塞
端(6)を加熱・封止して投入した電極(3)を外囲器(1)の
閉塞端(6)側の封着部(4)に固定し、次いで残る他の電極
(2)を開口(8)側から外囲器(1)内に投入してから外囲器
(1)内を略真空状態或いは非酸化性雰囲気にし、続いて
必要ガスを充填した後前記開口端(8)を閉塞して外囲器
(1)の前記封着部(4)と閉塞端(8a)間の距離(R)を所定長
さにし、次いで外囲器(1)を反転させて残る未固着の他
の電極(2)を他の下側の閉塞端(8a)側に移動させて、前
記電極(2)の端部を下側の閉塞端(8a)に当接させ、然る
後前記下側の閉塞端(8a)側を封着して他の電極(2)を前
記封着部(5)に固定し、次いで外囲器(1)の端部を切除す
る』事を特徴とする。Further, "claim 3" is a discharge lamp according to the present invention.
According to another method (see FIGS. 2 (a) to (g)) of the manufacturing method of (A), “a predetermined length (M) is applied to the envelope (1) whose one end is open and the other end is closed. Insert one electrode (2) of the pair of electrodes (2) and (3) from the side of the opening (8) and contact the charged one electrode (3) with the closed end (6) of the envelope (1). At the same time, the inside of the envelope (1) is brought into a substantially vacuum state or a non-oxidizing atmosphere, and then the closed end (6) of the envelope (1) is heated and sealed, and the electrode (3) is charged. Other electrodes fixed to the sealing part (4) on the closed end (6) side of the envelope (1) and then left
Insert (2) into the envelope (1) from the opening (8) side, and then
(1) The inside is made into a substantially vacuum state or a non-oxidizing atmosphere, and then the necessary gas is filled, and then the opening end (8) is closed and the envelope is enclosed.
The distance (R) between the sealed portion (4) and the closed end (8a) of (1) is set to a predetermined length, and then the envelope (1) is inverted to remain the other unfixed electrode (2). Is moved to the other lower closed end (8a) side, the end of the electrode (2) is brought into contact with the lower closed end (8a), and then the lower closed end (8a). ) Side is sealed to fix the other electrode (2) to the sealed portion (5), and then the end of the envelope (1) is cut off. ”
【００１０】『請求項４』は本発明に係る放電灯(A)の
製造方法の更に他の方法（図３(a)〜(g)参照）で『両端
が開放された筒状の外囲器(1A)の一端(6A)側に一対の電
極(2)(3)の一方(3)を挿入し、一方の電極(3)の挿入側端
部(6A)を加熱・封止して投入した電極(3)を外囲器(1)の
一端(6A)側に形成した封着部(4)に固定し、次いで残る
他の電極(2)を外囲器(1)の開口(8)側から外囲器(1)内に
投入してから外囲器(1)内を吸引して略真空状態にし、
次いで必要ガスを外囲器(1)内に充填した後前記開口端
(8)を閉塞して外囲器(1)の前記封着部(4)と閉塞端(8a)
間の距離(R)を所定長さにし、次いで外囲器(1)を反転さ
せて残る未固着の他の電極(2)を他の下側の閉塞側端部
(8a)に移動させて、前記電極(2)の端部を下側の閉塞端
(8a)に当接させ、然る後前記下側の閉塞端(8a)側を封着
して他の電極(2)を前記封着部(5)に固定し、次いで外囲
器(1)の端部を切除する』事を特徴とする。"Claim 4" is a method for manufacturing a discharge lamp (A) according to the present invention, which is another method (see FIGS. 3 (a) to 3 (g)). Insert one side (3) of the pair of electrodes (2) and (3) into one end (6A) side of the container (1A) and heat / seal the insertion side end (6A) of the one electrode (3). The charged electrode (3) was fixed to the sealing part (4) formed on one end (6A) side of the envelope (1), and then the remaining other electrode (2) was opened in the envelope (1) ( 8) into the envelope (1) from the side, then suction the inside of the envelope (1) to a substantially vacuum state,
Then, after filling the required gas into the envelope (1), the open end
(8) is closed to close the sealed portion (4) and the closed end (8a) of the envelope (1).
The distance (R) between them is set to a predetermined length, and then the envelope (1) is inverted and the remaining unfixed electrode (2) is attached to the other lower end on the closed side.
(8a), move the end of the electrode (2) to the lower closed end.
(8a), and then the lower closed end (8a) side is sealed to fix the other electrode (2) to the sealing portion (5), and then the envelope (1 The end part of () is cut off ”.
【００１１】これによれば、いずれの場合も外囲器(1)
の図１(d)のように閉塞端(6)(8a)間の長さ(S)が一定或
いは封着部(4)と閉塞端(8a)の間の長さ(R)が電極(2)(3)
の封着位置を定める基準となるものであるから、外囲器
(1)を反転させるだけで電極(2)(3)の封着位置と電極(2)
(3)間距離(P)を定める事が出来、電極(2)(3)の位置決め
がすこぶる簡単であって大量生産に好適である。又、本
発明方法は、チップ管(10')を使用しないので、側壁に
封切跡(10')が発生せず、外囲器(1d)に残留する歪みの
発生源を減ずる事が出来、外囲器(1d)の破裂原因の１つ
を解消する事が出来る。しかも、チップ管(9')の封切跡
(10')がなくなる事により、配光性能も各段に向上し、
光学系など精密照明の分野にも適用出来、その応用範囲
が各段に向上するものである。According to this, in any case, the envelope (1)
1 (d), the length (S) between the closed ends (6) and (8a) is constant, or the length (R) between the sealing portion (4) and the closed end (8a) is the electrode ( 2) (3)
Since it is the standard for determining the sealing position of the
The electrode (2) and the sealing position of the electrode (3) and the electrode (2) can be simply reversed.
(3) The distance (P) can be set, and the positioning of the electrodes (2) and (3) is extremely simple, which is suitable for mass production. Further, since the method of the present invention does not use the tip tube (10 '), no seal marks (10') are generated on the side wall, and the source of strain remaining in the envelope (1d) can be reduced, One of the causes of the rupture of the envelope (1d) can be eliminated. Moreover, the seal mark of the tip tube (9 ')
By eliminating (10 '), the light distribution performance is also improved,
It can be applied to the field of precision lighting such as optical systems, and the range of its application will be improved.
【００１２】『請求項４』は、「電極(2)(3)に非蒸発型
ゲッタ(2e)(3e)が取着されており、封着部(4)(5)の形成
時の熱でゲッタ(2e)(3e)を活性化させる」を特徴とする
もので、ゲッタ(2e)(3e)の活性化工程を特に必要とせ
ず、製造工程を簡略化する事ができる。According to claim 4, "The non-evaporable getters (2e) (3e) are attached to the electrodes (2) (3), and the heat generated when the sealing parts (4) (5) are formed. The getters (2e) and (3e) are activated by the above ", and the manufacturing process can be simplified without requiring the activation process of the getters (2e) and (3e).
【００１３】[0013]
【実施例】以下、本発明を図示実施例に従って詳述す
る。本発明の放電灯(A)は、一般照明の分野や精密照明
分野は勿論、例えば０.１Ｗ/Ｈ程度の小型チップレスタ
イプとすることで、例えば冷蔵庫や下駄箱など狭い閉空
間の脱臭・殺菌に使用する事も可能である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. The discharge lamp (A) of the present invention is not only used in the field of general lighting and the field of precision lighting, but is also a small chipless type of, for example, about 0.1 W / H, so that it can be used for deodorizing a small closed space such as a refrigerator or a shoe box It can also be used for sterilization.
【００１４】本発明の放電灯(A)の主たる構成は、外囲
器(1)及び一対の電極(2)(3)である。外囲器(1)は所定寸
法に切断された円筒状のものが使用され、その一端が加
熱されて封着された試験管状のものが製造に供せられ
る。図１(a)の外囲器(1)は一端が開放され、他端が閉塞
されており、その材質は前記用途に使用される場合、オ
ゾンの放出量が多くなるように石英ガラスで構成され
る。勿論、別異の材質（例えばソーダガラスのような普
通ガラス、ハードガラスなど）で構成する事も可能であ
る。The main components of the discharge lamp (A) of the present invention are the envelope (1) and the pair of electrodes (2) and (3). As the envelope (1), a cylindrical one cut to a predetermined size is used, and one end thereof is heated and sealed in a test tube to be used for manufacturing. The envelope (1) of FIG. 1 (a) has one end open and the other end closed, and the material is made of quartz glass so that the amount of released ozone is large when it is used for the above purpose. To be done. Of course, it is also possible to use different materials (for example, ordinary glass such as soda glass, hard glass, etc.).
【００１５】電極(2)は電極本体(2a)、内部リード棒(2
b)、封着用箔(2c)並びに外部リード棒(2d)で構成されて
いる。電極本体(2a)は内部リード棒(2b)の先端に溶接さ
れており、内部リード棒(2b)の他端は封着用箔(2c)に溶
接されており、封着用箔(2c)の他端には外部リード棒(2
d)が溶接されていて、これら４点が一体化されている。
電極本体(2a)の表面にはゲッタ(2e)が取着されている。
本実施例で使用する不純物除去用ゲッタ(2e)は非蒸発型
で、ゲッタ(2e)を加熱する事によりゲッタ(2e)表面の保
護皮膜を除去し、真空系内に存在する極く微量の不純物
（例えば０2、Ｈ2０、Ｎ2、Ｃ０、Ｈ2）をゲッタ(2e)の
内部に拡散させ、これら不純物を永久的に固定し、再放
出しないという働きをなす。The electrode (2) includes an electrode body (2a) and an internal lead rod (2
b), sealing foil (2c) and external lead rod (2d). The electrode body (2a) is welded to the tip of the inner lead rod (2b), the other end of the inner lead rod (2b) is welded to the sealing foil (2c), and other than the sealing foil (2c). The outer lead bar (2
d) is welded and these four points are integrated.
A getter (2e) is attached to the surface of the electrode body (2a).
The getter (2e) for removing impurities used in this embodiment is a non-evaporable type, and the protective film on the surface of the getter (2e) is removed by heating the getter (2e), and the trace amount of the very small amount present in the vacuum system is removed. Impurities (for example, 0 2 , H 2 0, N 2 , C0, and H 2 ) are diffused inside the getter (2e), and these impurities are permanently fixed and not released again.
【００１６】電極(2)の全長は(M)で同種のものは略一定
寸法に揃えられる。電極本体(2a)の幅は(d)、電極本体
(2a)と封着用箔(2c)との間隔は(L)である。外囲器(1)の
内径(D)は、電極(2)の電極本体(2a)の幅(d)より若干大
きく、電極(2)を外囲器(1)に簡単に挿入する事ができ
る。電極(2)と電極(3)とは同一形状のものであるので、
電極(3)に付いての説明は電極(2)の説明に代えて省略す
る。The total length of the electrode (2) is (M), and the same kind of electrode (2) is arranged in a substantially constant size. The width of the electrode body (2a) is (d), the electrode body
The distance between (2a) and the sealing foil (2c) is (L). The inner diameter (D) of the envelope (1) is slightly larger than the width (d) of the electrode body (2a) of the electrode (2), and the electrode (2) can be easily inserted into the envelope (1). it can. Since the electrode (2) and the electrode (3) have the same shape,
The description of the electrode (3) will be omitted instead of the description of the electrode (2).
【００１７】《作 用》次に、本第１発明方法の製造手
順を図１に従って説明する。まず、一端開口、他端閉塞
の試験管状外囲器(1)と電極(2)(3)を用意し、外囲器(1)
の閉塞端(6)を下にし、電極本体(3a)(2a)とを対向させ
て電極(3)(2)を挿入する。『図１(a)』電極(3)(2)は外
囲器(1)内を閉塞端(6)に向かって落下し、先に挿入した
電極(3)の外部リード棒(3d)が閉塞端(6)に当接する。一
緒に投入した電極(2)の電極本体(2a)は電極(3)の電極本
体(3a)に当接している。『図１(b)参照』<Operation> Next, the manufacturing procedure of the first invention method will be described with reference to FIG. First, prepare a test tubular envelope (1) and electrodes (2) (3) that are open at one end and closed at the other end.
The electrodes (3) and (2) are inserted with the closed end (6) of the electrode facing downward and the electrode bodies (3a) and (2a) facing each other. "Fig. 1 (a)" The electrodes (3) and (2) fall inside the envelope (1) toward the closed end (6), and the external lead rod (3d) of the electrode (3) inserted earlier is Abut the closed end (6). The electrode body (2a) of the electrode (2) thrown together is in contact with the electrode body (3a) of the electrode (3). "See Figure 1 (b)"
【００１８】この状態で外囲器(1)内の空気を吸引して
略真空状態にし、然る後不活性ガスでウォッシングした
後、必要ガスを外囲器(1)内に充填し、続いて開口(8)側
を加熱して軟化させ、開口(8)を封止する。この封着端
を(8a)とする。この場合、加熱されている開口(8)と電
極(2)(3)とは図１(b)から分かるように、十分な距離が
あるので、開口(8)の加熱によって電極(2)(3)のゲッタ
(2e)(3e)は活性化される事がない。この開口(8)の封止
時に、外囲器(1)の閉塞端(6)(8a)間の寸法(S)は所定寸
法に揃えられる。In this state, the air in the envelope (1) is sucked to bring it into a substantially vacuum state, and after washing with an inert gas, the required gas is filled in the envelope (1), The opening (8) side is heated to soften it, and the opening (8) is sealed. This sealed end is (8a). In this case, there is a sufficient distance between the heated opening (8) and the electrodes (2) and (3), so that the heating of the opening (8) causes the electrodes (2) ( 3) Getter
(2e) and (3e) are never activated. When the opening (8) is sealed, the dimension (S) between the closed ends (6) and (8a) of the envelope (1) is adjusted to a predetermined dimension.
【００１９】次に、外囲器(1)を立てた状態で、閉塞端
(6)側の電極(3)の封着用箔(3c)に一致する部分を加熱し
て軟化させ、加熱部分をピンチングして閉塞端(6)側に
封着部(4)を形成する。この封着で形成された封着部(4)
内には封着用箔(3c)が埋設され、封着部(4)から外囲器
(1)内に向けて内部リード棒(3b)が突出し反対側にて中
空閉空間である閉塞空間部(7)側に外部リード棒(3d)が
突出する。『図１(c)』Next, with the envelope (1) in the upright position, the closed end is
A portion of the electrode (3) on the (6) side corresponding to the sealing foil (3c) is heated and softened, and the heated portion is pinched to form a sealing portion (4) on the closed end (6) side. Sealing part formed by this sealing (4)
A sealing foil (3c) is embedded inside, and from the sealing part (4) to the envelope.
(1) The inner lead rod (3b) projects inward, and the outer lead rod (3d) projects toward the closed space (7), which is a hollow closed space, on the opposite side. "Figure 1 (c)"
【００２０】次に、外囲器(1)を反転させて閉塞端(8a)
を下にすると、フリーの電極(2)が閉塞端(8a)側に落下
し、閉塞端(8a)に電極(2)の外部リード棒(2d)が当接す
る。この状態で閉塞端(8a)側の電極(2)の封着用箔(2c)
に一致する部分を加熱して軟化させ、加熱部分をピンチ
ングして閉塞端(8a)側に封着部(5)を形成する。この封
着で形成された封着部(5)内には封着用箔(2c)が埋設さ
れ、封着部(5)から外囲器(1)内に向けて内部リード棒(2
b)が突出し、反対側にて中空閉空間である閉塞空間部(1
1)側に外部リード棒(2d)が突出する。『図１(d)(e)』Next, the envelope (1) is inverted to close the closed end (8a).
When the bottom is turned down, the free electrode (2) falls to the closed end (8a) side, and the external lead rod (2d) of the electrode (2) contacts the closed end (8a). In this state, the sealing foil (2c) for the electrode (2) on the closed end (8a) side
Is heated to soften it, and the heated portion is pinched to form a sealing portion (5) on the closed end (8a) side. The sealing foil (2c) is embedded in the sealing portion (5) formed by this sealing, and the inner lead rod (2) is inserted from the sealing portion (5) into the envelope (1).
b) protrudes and the closed space part (1
The external lead rod (2d) projects to the 1) side. "Fig. 1 (d) (e)"
【００２１】このように、外囲器(1)の封着部(4)(5)の
形成が終了すると、封着部(4)(5)の端部に一致する所で
外囲器(1)の端部（即ち、閉塞空間部(7)(11)）を切除し
て封着部(4)(5)から外部リード棒(2d)(3d)が外部に突出
するようにする。その後、必要に応じて外囲器(1)全体
をアニールする。When the formation of the sealed portions (4) and (5) of the envelope (1) is completed in this way, the envelope ( The end portion (1) (that is, the closed space portions (7) and (11)) is cut off so that the external lead rods (2d) and (3d) protrude outside from the sealing portions (4) and (5). After that, the entire envelope (1) is annealed if necessary.
【００２２】ここで、外囲器(1)と電極(2)(3)との関係
を詳述する。外囲器(1)の両閉塞端(6)(8a)の間の距離
(S)は一定であり、電極(2)(3)の全長(M)も一定である。
この状態で外囲器(1)を立てると閉塞端(6)に当接する電
極(3)の封着用箔(3c)の位置は常に一定であり、所定の
位置を加熱してピンチングを行えば、自動的に封着部
(4)内に封着用箔(3c)が埋設されることになる。同様
に、外囲器(1)を反転させる事により、電極(2)と封着部
(5)も所定の位置にピンチングされる事になる。その結
果、電極本体(2a)(3b)の間隔(P)は自動的に常に一定と
なる。Now, the relationship between the envelope (1) and the electrodes (2) and (3) will be described in detail. Distance between both closed ends (6) (8a) of the envelope (1)
(S) is constant, and the total length (M) of the electrodes (2) and (3) is also constant.
When the envelope (1) is raised in this state, the position of the sealing foil (3c) of the electrode (3) that abuts the closed end (6) is always constant, and if the pinching is performed by heating the predetermined position. , Automatically sealed
The sealing foil (3c) will be embedded in (4). Similarly, by inverting the envelope (1), the electrode (2) and the sealing part
(5) will also be pinched at a predetermined position. As a result, the interval (P) between the electrode bodies (2a) and (3b) automatically becomes always constant.
【００２３】次にゲッタ(2e)(3e)の作用について説明す
ると、封着部(4)(5)の形成時に略真空状態の外囲器(1)
の端部が加熱される。この熱は放射或いは熱伝導で電極
本体(2a)(3a)を数百度（６００〜９５０℃）にするが、
この熱で電極本体(2a)(3a)上に取着されたゲッタ(2e)(3
e)の保護薄膜が除去されて内部の活性部材が露出し、外
囲器(1)内部に残留している極く微量の不純物ガスや、
外囲器(1)或いは電極(2)(3)から放出された極く微量の
不純物ガスが活性部材に吸着され、放電灯(A)の寿命を
縮たり黒化の原因となる外囲器(1)内の不純物が除去さ
れる。Next, the operation of the getters (2e) and (3e) will be described. The envelope (1) in a substantially vacuum state when the sealing portions (4) and (5) are formed.
The ends of are heated. This heat radiates or conducts heat to make the electrode bodies (2a) (3a) several hundred degrees (600-950 ° C),
This heat causes the getters (2e) (3e) attached to the electrode bodies (2a) (3a) to
The protective thin film of e) is removed to expose the active member inside, and a very small amount of impurity gas remaining inside the envelope (1),
An extremely small amount of impurity gas emitted from the envelope (1) or electrodes (2) (3) is adsorbed on the active member, which shortens the life of the discharge lamp (A) and causes blackening. Impurities in (1) are removed.
【００２４】次に、本第２発明方法を図２に従って説明
する。本第１発明方法と同一部分は簡単に説明し、異な
る部分のみを主として説明する。用意するものは第１例
と同様で、一端開口、他端閉塞の試験管状外囲器(1)と
電極(2)(3)である。この場合は、まず、外囲器(1)の閉
塞端(6)を下にし、一対の電極(2)(3)の内の一方の電極
(3)だけを挿入する。電極(3)は外囲器(1)内を閉塞端(6)
に向かって落下し、電極(3)の外部リード棒(3d)が閉塞
端(6)に当接する。『図２(b)参照』Next, the second inventive method will be described with reference to FIG. The same parts as those of the first method of the present invention will be briefly described, and only different parts will be mainly described. The ones to be prepared are the same as in the first example, and the test tubular envelope (1) and the electrodes (2) and (3) with one end open and the other end closed. In this case, first, with the closed end (6) of the envelope (1) facing down, one electrode of the pair of electrodes (2) (3)
Insert only (3). The electrode (3) closes the inside of the envelope (1) (6)
The outer lead rod (3d) of the electrode (3) contacts the closed end (6). "See Figure 2 (b)"
【００２５】この状態で外囲器(1)内の空気を吸引して
略真空状態或いは不活性ガス充填による非酸化性状態に
し、この状態で外囲器(1)の閉塞端(6)を加熱・封止して
投入した電極(3)を外囲器(1)の閉塞端(6)側の封着部(4)
に固定する。『図２(d)』次いで残る他の電極(2)の電極
本体(2a)を先に固定した電極(3)の電極本体(3a)に対向
させて挿入する。電極(2)は外囲器(1)内を電極(3)に向
かって落下し、電極本体(2a)(3a)同士が当接する。この
状態でを開口(8)側から外囲器(1)内を吸引して略真空状
態にし、次いで必要ガスを充填してから開口(8)側を加
熱して軟化させ、開口(8)を封止する。この開口(8)の封
止時に、外囲器(1)の封着部(4)と閉塞端(8a)間の寸法
(R)は所定寸法に揃えられる。『図２(d)参照』In this state, the air in the envelope (1) is sucked into a substantially vacuum state or a non-oxidizing state by filling with an inert gas, and in this state, the closed end (6) of the envelope (1) is closed. Sealing part (4) on the closed end (6) side of the envelope (1) with the electrode (3) heated and sealed
Fixed to. [FIG. 2 (d)] Then, the electrode body (2a) of the remaining other electrode (2) is inserted so as to face the electrode body (3a) of the previously fixed electrode (3). The electrode (2) falls inside the envelope (1) toward the electrode (3), and the electrode bodies (2a) and (3a) come into contact with each other. In this state, the inside of the envelope (1) is suctioned from the opening (8) side to a substantially vacuum state, and then the necessary gas is filled, and then the opening (8) side is heated to soften the opening (8). Is sealed. Dimension between the sealing part (4) and closed end (8a) of the envelope (1) when sealing this opening (8)
(R) has a predetermined size. "See Figure 2 (d)"
【００２６】次いで外囲器(1)を反転させて残る未固着
の他の電極(2)を他の下側の閉塞端(8a)側に移動させ
て、前記電極(2)の外部リード棒(2d)を下側の閉塞端(8
a)に当接させ、然る後前記下側の閉塞端(8a)側を封着し
て他の電極(2)を前記封着部(5)に固定し、次いで外囲器
(1)の端部を切除する。その後、必要に応じて外囲器(1)
全体をアニールする。Then, the envelope (1) is turned over to move the other unfixed electrode (2) which remains unfixed to the other closed end (8a) side, and the external lead rod of the electrode (2). (2d) to the lower closed end (8
a), and then the lower closed end (8a) side is sealed to fix the other electrode (2) to the sealing portion (5), and then the envelope.
Cut off the end of (1). Then, if necessary, the envelope (1)
Anneal the whole.
【００２７】次に、本第３発明方法を図３に従って説明
する。本第３発明方法の第１又は２例と同一部分は簡単
に説明し、異なる部分のみを主として説明する。用意す
るものは第１例と異なり、両端開口の外囲器(1)と電極
(2)(3)である。この場合は、まず、外囲器(1)を立てて
設置し、一方の電極(3)を挿入する。『図３(a)(b)』Next, the third inventive method will be described with reference to FIG. The same parts as those of the first or second example of the third invention method will be briefly described, and only different parts will be mainly described. Different from the first example, the one to be prepared has an envelope (1) and an electrode with openings at both ends.
(2) and (3). In this case, first, the envelope (1) is set upright, and one electrode (3) is inserted. "Figure 3 (a) (b)"
【００２８】この状態で外囲器(1)内に非酸化性ガスを
供給して投入電極(3)の酸化を防ぎつつ、外囲器(1)の投
入側端(6A)の必要部分を加熱して封止して投入した電極
(3)を外囲器(1)の閉塞端(6)側の封着部(4)に固定する。
『図３(c)』In this state, while supplying a non-oxidizing gas into the envelope (1) to prevent the charging electrode (3) from being oxidized, the necessary portion of the charging side end (6A) of the envelope (1) is removed. Electrode heated and sealed
(3) is fixed to the sealing portion (4) on the closed end (6) side of the envelope (1).
"Figure 3 (c)"
【００２９】次いで残る他の電極(2)の電極本体(2a)を
先に固定した電極(3)の電極本体(3a)に対向させて挿入
する。電極(2)は外囲器(1)内を電極(3)に向かって落下
し、電極本体(2a)(3a)同士が当接する。この状態でを開
口(8)側から外囲器(1)内を吸引して略真空状態にし、次
いでウォッシングを経てから必要ガスを充填し、然る後
開口(8)側を加熱して軟化させ、開口(8)を封止する。こ
の開口(8)の封止時に、外囲器(1)の封着部(4)と閉塞端
(8a)間の寸法(R)は所定寸法に揃えられる。『図１(d)参
照』Next, the electrode body (2a) of the other remaining electrode (2) is inserted so as to face the electrode body (3a) of the electrode (3) previously fixed. The electrode (2) falls inside the envelope (1) toward the electrode (3), and the electrode bodies (2a) and (3a) come into contact with each other. In this state, the inside of the envelope (1) is sucked from the opening (8) side to a substantially vacuum state, and after the washing, the necessary gas is filled, and then the opening (8) side is heated to soften it. To seal the opening (8). When sealing this opening (8), the sealing part (4) and the closed end of the envelope (1)
The dimension (R) between (8a) is aligned to a predetermined dimension. "See Fig. 1 (d)"
【００３０】次いで外囲器(1)を反転させて残る未固着
の他の電極(2)を他の下側の閉塞端(8a)側に移動させ
て、前記電極(2)の外部リード棒(2d)を下側の閉塞端(8
a)に当接させ、然る後前記下側の閉塞端(8a)側を封着し
て他の電極(2)を前記封着部(5)に固定し、次いで外囲器
(1)の端部を切除する。その後、必要に応じて外囲器(1)
全体をアニールする。Next, the envelope (1) is turned over to move the other unfixed electrode (2) remaining unfixed to the other closed lower end (8a) side, and the external lead rod of the electrode (2) is moved. (2d) to the lower closed end (8
a), and then the lower closed end (8a) side is sealed to fix the other electrode (2) to the sealing portion (5), and then the envelope.
Cut off the end of (1). Then, if necessary, the envelope (1)
Anneal the whole.
【００３１】[0031]
【発明の効果】本発明の放電灯には、チップ管の封切跡
がないので、配光性能に優れ、一般照明の分野は当然の
こと、光学系など精密照明の分野にも十分適用出来る。
また、小型化出来、且つ外囲器に石英ガラスを使用する
事により、例えば冷蔵庫や下駄箱など狭い閉空間の脱臭
・殺菌に使用する事も可能である。また、外囲器の閉塞
端間の長さ電極の全長を一定にする事により、外囲器を
反転させるだけで電極の封着位置並びに電極間距離を定
める事が出来、量産に好適である。また、チップレスタ
イプとすることで、外囲器に残留する歪みの発生源を減
ずる事が出来、外囲器の破裂原因の１つを解消する事が
出来る。更に、封着時にゲッタを活性化させる事が出来
るので、活性化工程を特に必要とせず、製造工程を簡略
化する事が出来る。Since the discharge lamp of the present invention has no trace of sealing of the tip tube, it has excellent light distribution performance, and can be applied not only in the field of general lighting but also in the field of precision lighting such as optical systems.
Further, it is possible to miniaturize, and by using quartz glass for the envelope, it can be used for deodorization and sterilization in a narrow closed space such as a refrigerator or a shoe box. Further, by making the length of the electrode between the closed ends of the envelope constant, the electrode sealing position and the electrode distance can be determined only by reversing the envelope, which is suitable for mass production. . Further, by adopting the chipless type, it is possible to reduce the source of strain remaining in the envelope, and it is possible to eliminate one of the causes of rupture of the envelope. Furthermore, since the getter can be activated at the time of sealing, the activation process is not particularly required and the manufacturing process can be simplified.
【図１】(a)〜(f) 本発明方法の工程手順を示す断面図1A to 1F are cross-sectional views showing process steps of the method of the present invention.
【図２】(a)〜(g) 本発明方法の他の工程手順を示す断
面図2 (a) to (g) are sectional views showing other steps of the method of the present invention.
【図３】(a)〜(g) 本発明方法の更に他の工程手順を示
す断面図3 (a) to (g) are sectional views showing still another process procedure of the method of the present invention.
【図４】(a)〜(e) 従来例の工程手順を示す断面図4A to 4E are cross-sectional views showing process steps of a conventional example.
(1)…外囲器 (S)…外囲器(1)の長さ (D)…開口内径 (1a)…閉塞側端部が封着された状態の外囲器 (1b)…両端が封着された状態の外囲器 (1c)…両端封着外囲器の一端に封着部が形成されている
場合 (1d)…封着された両端の不要部分が切除された状態の外
囲器 (2)…電極 (M)…電極長さ (d)…箔の幅 (L)…電極と
箔の間の距離 (2a)…電極本体 (2b)…内部リード棒 (2c)…封着用箔
(2d)…外部リード棒 (2e)…ゲッタ (3)…電極 (3a)…電極本体 (3b)…内部リード棒 (3c)…封着用箔
(3d)…外部リード棒 (3e)…ゲッタ (4)…封着部 (5)…封着部 (6)…閉塞端 (7)…閉塞空間部 (8)…開口端 (8a)…閉塞端 (9)…チップ管 (10)…封切跡 (11)…閉塞空間部(1) ... Enclosure (S) ... Length of envelope (1) (D) ... Inner diameter of opening (1a) ... Enclosure (1b) ... Enclosed envelope (1c) ... Both ends sealed If the envelope has a seal on one end (1d) ... Outside of the state where unnecessary parts on both ends of the seal are cut off. Enclosure (2) ... Electrode (M) ... Electrode length (d) ... Foil width (L) ... Distance between electrodes (2a) ... Electrode body (2b) ... Inner lead rod (2c) ... Encapsulation Worn foil
(2d) ... External lead rod (2e) ... Getter (3) ... Electrode (3a) ... Electrode body (3b) ... Internal lead rod (3c) ... Sealing foil
(3d) ... External lead rod (3e) ... Getter (4) ... Sealing part (5) ... Sealing part (6) ... Closed end (7) ... Closed space part (8) ... Open end (8a) ... Closed End (9)… Tip tube (10)… Seal cut mark (11)… Closed space
Claims (5)
プ管の封切跡がなく、封着部間の側壁全面が平滑な円筒
面となっている外囲器と、前記封着部内に埋設されてい
る封着用箔と、前記封着用箔から外囲器内に封着部に近
接して突出しており且つゲッタが取着されている電極本
体と、封着用箔に接続し封着部から外部に突出している
外部リードとで構成されている事を特徴とする放電灯。1. An envelope in which both ends are sealed, there is no trace of a chip tube on the side wall, and the entire side wall between the sealed parts is a smooth cylindrical surface, and the envelope is embedded in the sealed part. A sealing foil, an electrode body protruding from the sealing foil into the envelope in the vicinity of the sealing portion and having a getter attached thereto, and the sealing foil being connected to the outside from the sealing portion. A discharge lamp characterized in that it is composed of an external lead projecting to the inside.
ている外囲器に、電極を開口側から挿入すると共に前記
外囲器内を略真空状態にした後必要ガスを充填し、前記
開口端を閉塞して外囲器の両閉塞端間の距離を所定長さ
にし、次いで外囲器を立てて一方の電極を前記外囲器の
一方の閉塞端に当接させ、この状態で下側の閉塞端側を
封着して下側の電極を封着部に固定し、次に外囲器を反
転させて残る他の電極を他の下側の閉塞側端部に移動さ
せて、前記電極の端部を下側の閉塞端に当接させ、然る
後前記下側の閉塞側を封着して他の電極を前記封着部に
固定し、次いで外囲器の端部を切除する事を特徴とする
放電灯の製造方法。2. An envelope whose one end is open and the other end is closed, in which the electrode is inserted from the opening side, the inside of the envelope is made into a substantially vacuum state, and then the necessary gas is filled, The end is closed to make the distance between both closed ends of the envelope a predetermined length, then the envelope is erected and one electrode is brought into contact with one closed end of the envelope. Side closed end side is sealed to fix the lower electrode to the sealing part, then the envelope is inverted to move the remaining other electrode to the other lower closed side end, The end portion of the electrode is brought into contact with the lower closed end, and then the lower closed side is sealed to fix another electrode to the sealing portion, and then the end portion of the envelope is fixed. A method for manufacturing a discharge lamp, which is characterized by cutting.
ている外囲器に、所定長さの一対の電極の一方を開口側
から挿入して前記投入した一方の電極を外囲器の閉塞端
に当接させると共に前記外囲器内を略真空状態或いは非
酸化性雰囲気にし、然る後外囲器の閉塞端を加熱・封止
して投入した電極を外囲器の閉塞端側の封着部に固定
し、次いで残る他の電極を開口側から外囲器内に投入し
てから外囲器内を略真空状態或いは非酸化性雰囲気に
し、次いで必要ガスを外囲器内に充填した後前記開口端
を閉塞して外囲器の前記封着部と閉塞端間の距離を所定
長さにし、次いで外囲器を反転させて残る未固着の他の
電極を他の下側の閉塞側端部に移動させて、前記電極の
端部を下側の閉塞端に当接させ、然る後前記下側の閉塞
側を封着して他の電極を前記封着部に固定し、次いで外
囲器の端部を切除する事を特徴とする放電灯の製造方
法。3. One of a pair of electrodes having a predetermined length is inserted from the opening side into an envelope having one end open and the other end closed, and the charged one electrode closes the envelope. The inside of the envelope is brought into a substantially vacuum state or a non-oxidizing atmosphere while being brought into contact with the end, and then the closed end of the envelope is heated and sealed, and the charged electrode is placed on the closed end side of the envelope. It is fixed to the sealing part, then the remaining other electrodes are put into the envelope from the opening side, and then the inside of the envelope is made into a substantially vacuum state or a non-oxidizing atmosphere, and then the necessary gas is filled into the envelope. After that, the open end is closed to make the distance between the sealing portion and the closed end of the envelope a predetermined length, and then the envelope is inverted to leave the other unfixed electrode on the other lower side. The end of the electrode is brought into contact with the lower closed end by moving it to the closed end, and then the lower closed side is sealed to seal another electrode. A method of manufacturing a discharge lamp, which comprises fixing to an attachment part and then cutting off an end part of an envelope.
一端側に所定長さの一対の電極の一方を挿入し、一方の
電極の挿入側端部を加熱・封止して投入した電極を外囲
器の一端側に形成した封着部に固定し、次いで残る他の
電極を外囲器の開口側から外囲器内に投入してから外囲
器内を吸引して略真空状態にし、次いで必要ガスを外囲
器内に充填した後前記開口端を閉塞して外囲器の前記封
着部と閉塞端部間の距離を所定長さにし、次いで外囲器
を反転させて残る未固着の他の電極を他の下側の閉塞側
端部に移動させて、前記電極の端部を下側の閉塞端に当
接させ、然る後前記下側の閉塞側を封着して他の電極を
前記封着部に固定し、次いで外囲器の端部を切除する事
を特徴とする放電灯の製造方法。4. One of a pair of electrodes having a predetermined length is inserted into one end of a tubular envelope having both ends open, and the insertion side end of the one electrode is heated and sealed and introduced. Fix the electrode to the sealing part formed on one end side of the envelope, then put the other remaining electrode into the envelope from the opening side of the envelope and then suck the inside of the envelope to generate a substantially vacuum. Then, after filling the envelope with the required gas, the open end is closed to make the distance between the sealed portion and the closed end of the envelope a predetermined length, and then the envelope is inverted. The remaining unfixed other electrode is moved to the other lower closed end so that the end of the electrode abuts the lower closed end, and then the lower closed end is sealed. A method of manufacturing a discharge lamp, comprising the step of attaching another electrode to the sealing portion, fixing the other electrode, and then cutting off the end portion of the envelope.
封着部形成時の熱でゲッタを活性化させる事を特徴とす
る請求項２〜４のいずれかに記載の放電灯の製造方法。5. A getter is attached to the electrode,
5. The method of manufacturing a discharge lamp according to claim 2, wherein the getter is activated by heat when forming the sealed portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14988296A JPH09306428A (en) | 1996-05-20 | 1996-05-20 | Discharge lamp and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14988296A JPH09306428A (en) | 1996-05-20 | 1996-05-20 | Discharge lamp and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09306428A true JPH09306428A (en) | 1997-11-28 |
Family
ID=15484707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14988296A Pending JPH09306428A (en) | 1996-05-20 | 1996-05-20 | Discharge lamp and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09306428A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001029862A1 (en) * | 1999-10-18 | 2001-04-26 | Matsushita Electric Industrial Co., Ltd. | High-pressure discharge lamp, lamp unit, method for producing high-pressure discharge lamp, and incandescent lamp |
-
1996
- 1996-05-20 JP JP14988296A patent/JPH09306428A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001029862A1 (en) * | 1999-10-18 | 2001-04-26 | Matsushita Electric Industrial Co., Ltd. | High-pressure discharge lamp, lamp unit, method for producing high-pressure discharge lamp, and incandescent lamp |
| US6844679B1 (en) | 1999-10-18 | 2005-01-18 | Matsushita Electric Industrial Co., Ltd. | Mercury lamp, lamp unit, method for producing mercury lamp and electric lamp |
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