CN202268325U

CN202268325U - High-voltage discharging lamp

Info

Publication number: CN202268325U
Application number: CN201120344160XU
Authority: CN
Inventors: 平尾哲治
Original assignee: Ushio Denki KK
Current assignee: Ushio Denki KK
Priority date: 2010-12-06
Filing date: 2011-09-07
Publication date: 2012-06-06
Anticipated expiration: 2021-09-07
Also published as: NL2007408A; JP5146858B2; NL2007408C2; JP2012123918A

Abstract

This utility model discloses a high-voltage discharging lamp, composed of a luminous part and a sealing part, wherein the luminous part is composed of quartz glasses; the interior of the luminous part comprises a pair of electrodes; the sealing part is formed on two ends of the of the luminous part; electricity is provided to the electrodes through a metal foil buried in the sealing part; in core lines of the electrodes, grooves extended on axial directions of the core lines are formed on a whole circumference direction, thus, a construction is provided so as to prevent generating a gap between the lateral end part of the sealing part and the quartz glasses in a sealing procedure; in a plurality of grooves formed on the core lines of the electrodes, the depth of the lateral end part of the sealing part is deeper than that of the other part.

Description

High-pressure discharge lamp

Technical field

The utility model relates to the high-pressure discharge lamp that a kind of projection arrangement etc. uses, and relates in particular to a kind of high-pressure discharge lamp that on the heart yearn of electrode, has formed the groove of long side direction.

Background technology

In the high-pressure discharge lamp that the light source used as projection arrangement uses, as its seal construction, adopt following paper tinsel seal construction: the root of the heart yearn through electrode engages with the metal forming that is embedded in sealing, via this metal forming to electrifying electrodes.

The electrode heart yearn is made up of tungsten usually, and luminous tube is made up of quartz glass, therefore in said paper tinsel seal construction because both difference of thermal coefficient of expansion in the sealing, the time regular meeting damage of sealing, damaged problem take place.Especially in the high-pressure discharge lamp that in recent projection arrangement, uses, for example enclose 0.15mg/mm in the illuminating part ³Above a large amount of mercury, when lighting a lamp, mercury vapor is pressed and is become the above high pressure of 100 air pressure, so this problem is further serious.

For addressing this problem, for example open in the 2008-529252 communique (patent documentation 1) and introduced following technology: on the electric wire heart yearn, axially be formed extended at both sides groove the spy.

Fig. 3 (A) is the summary structural map of the lamp that relates to of above-mentioned existing example, and Fig. 3 (B) is the enlarged drawing of electrode.

Like Fig. 3 (A) and (B), high-pressure discharge lamp 1 is made up of the sealing 3 at illuminating part 2 and its two ends, and configured

electrodes

4,4 in illuminating part 2, in sealing 3, are embedded with metal forming 5.The heart yearn 6 and the outer lead 7 of electrode 4 join this metal forming 5 to, supply power to electrode 4 through this metal forming 5.

On the heart yearn 6 of this electrode 4, with sealing 4 opposed outer surface zones in, a plurality of grooves 8 that extend at direction of principal axis form on this whole circumference direction.

In the above-mentioned prior art; Through a plurality of grooves 8 are set on electrode heart yearn 8; Make the surface roughness of the surface roughness of circumferencial direction greater than long side direction; The breakage of the different sealings that cause of the coefficient of thermal expansion of the material (tungsten) of elimination electrode heart yearn 6 and the material (quartz glass) of sealing 3, in order in sealing 3, not crack, the groove end of luminous tube side is exposed to discharge space.

And in the sealing process of said high-pressure discharge lamp; Adopt the encapsulating method of following what is called " collapsed seal ": inside is lower than atmospheric pressure generally speaking; Therefore utilize the pressure differential of outside (atmosphere) and inner (below the atmospheric pressure), quartz glass (sealing) is softening through heating sources such as burners, undergauge.

But in this lamp, enclosed a large amount of mercury in its illuminating part, during this vaporized mercury, internal pressure rises under the high temperature in when sealing, therefore can't undergauge, can't as imagining, seal.Therefore generally speaking, luminous tube is vertically disposed,,, thereby internal pressure is not sealed with rising with pure water or liquid nitrogen cooling so that about sealing is in, make the lower end of mercury near luminous tube.The sealing method for example is documented in the spy and opens in the 2004-342497 communique (patent documentation 2).

Fig. 4 representes its summary, and lamp 1 erects its sealing 3 with becoming above-below direction and be supported.In sealing portion 3, insert the arc-spark stand that assembles by electrode 4, metal forming 5, outer lead 7 etc., begin through burner 10 heating from the periphery of sealing 3.This burner 10 moves at the above-below direction and the circumferencial direction of sealing 3, heating sealing portion 3.

And when its heat shrink, as shown in Figure 5, quartz glass is difficult for invading the corner portion of joint of rear end and the metal forming 5 of electrode heart yearn 6; Therefore space S all appears in any case easily; When having this gap S, bigger stress focuses on this position, is prone to cause breaking of sealing 3.

Therefore, in order to eliminate this gap S as far as possible, the local carefulness that is equivalent to corresponding position is heated, and fire energetically.

When on electrode heart yearn 6, forming axial groove 8, shown in Fig. 6 (A), the quartz glass 11 of the sealing 3 of fusion invades in this groove 8 but as stated.But the quartz glass of fusion is shown in Fig. 6 (B), and the glass that is in molten condition lets droop because of gravity.

Especially, the sealed part side rear end of groove 8 (being the upper end among the figure) part is fired as stated energetically, so the viscosity of melten glass, and its sagging quantitative change is big, and produces gap 12 between the groove 8.

In sealing 3, by the part of metal forming 5 position sealing, that form this groove 8, be in the state that is communicated with illuminating part 2 in fact.Therefore, when this part produced bigger gap 12, the mercury in the illuminating part 2 invaded this part, will no longer evaporate in case invade the mercury of this gap portion, and the result reduces the mercury in the illuminating part 2, and generation can't obtain the problem of required luminous intensity.

Patent documentation 1: the spy opens the 2008-529252 communique

Patent documentation 2: the spy opens the 2004-342497 communique

Summary of the invention

The utility model is in view of above-mentioned prior art problems; A kind of high-pressure discharge lamp that on the electrode heart yearn, has formed axial a plurality of grooves is provided; The fused silica glass that invades in the time of can preventing to seal in this groove lets droop, and produces the problem in space at the rear end part of groove.

For addressing the above problem, the high-pressure discharge lamp that the utility model relates to is characterised in that in a plurality of grooves that on direction of principal axis, form on the heart yearn of electrode, its part in addition of the depth ratio of sealing portion rear flank end is dark.

According to the utility model; Deepened to be formed at the degree of depth of a plurality of grooves of electrode heart yearn at sealed part side, therefore when sealing, the quartz glass of fusion invades this darker part; Have with respect to sagging resistance at this partial action, between glass and slot part, can not form bigger gap.

Therefore, the amount of mercury in the illuminating part can significantly not reduce, and luminous intensity can not reduce.

Description of drawings

Fig. 1 is the phantom of the electrode plug of the high-pressure discharge lamp that relates to of the utility model.

Fig. 2 is the amplification view of the effect of explanation the utility model.

Fig. 3 is the overall diagram of existing lamp and the enlarged drawing of electrode.

Fig. 4 is the key diagram of the sealing process of lamp.

Fig. 5 is the amplification view of the electrode heart yearn rearward end in the existing sealing.

Key diagram when Fig. 6 is existing the sealing.

Embodiment

Fig. 1 is the phantom of groove 8 parts in the electrode heart yearn 6 of high-pressure discharge lamp of the utility model, and in the groove 8 that on the direction of principal axis of heart yearn 6, forms, the degree of depth of its sealed part side end 8a is greater than the degree of depth of the part beyond it.

This groove 8 for example can form through laser radiation; Illuminating part side irradiating laser from heart yearn 6; With certain speed laser is moved along the long side direction of this heart yearn 6; Stop to move of laser in the sealed part side end, compare longer time ground irradiating laser with other parts, thereby can make the degree of depth of the groove 8a of sealed part side end form greater than other parts.

Its numerical value of example, then the spacing of the circumferencial direction of groove 8 is 40 μ m, and the whole degree of depth of groove is 6 μ m, and the degree of depth of sealed part side end 8a is 9 μ m.

During with state sealing shown in Figure 4, as shown in Figure 2, the quartz glass 11 of fusion invades this darker end 8a to the lamp of groove 8 with this shape.Therefore, the quartz glass 11 of fusion produces and sagging relative resistance through this darker slot part 8a, has suppressed downward flowing, and can not produce big gap between the groove 8.

As stated, in the high-pressure discharge lamp of the utility model, the depth ratio of the sealed part side end through making the axial a plurality of grooves that on the electrode heart yearn, form part beyond it is dark, between groove and quartz glass, can not form big gap.Therefore, the amount of mercury in the illuminating part can significantly not reduce, and can guarantee required luminous intensity.

Claims

1. a high-pressure discharge lamp is made up of illuminating part and sealing, and wherein above-mentioned illuminating part is made up of quartz glass; Inside has pair of electrodes, and above-mentioned sealing is formed on the two ends of this illuminating part, through being embedded in metal forming in the sealing portion to above-mentioned electrode power supply; It is characterized in that

In the heart yearn of above-mentioned electrode, on the whole circumference direction, form at the groove that extends on the direction of principal axis of this heart yearn,

In this groove, other parts of the depth ratio in the sealed part side end are dark.

2. high-pressure discharge lamp according to claim 1 is characterized in that above-mentioned groove forms through laser radiation.