公开(公告)号：US3855844A

公开(公告)日：1974-12-24

申请号：US41599973

申请日：1973-11-15

Applicant: GEN MOTORS CORP

Inventor： CRAIG G

IPC: G01M3/20 ,  G01M3/22 ,  G01M3/32

CPC classification number: G01M3/229 ,  G01M3/202 ,  G01M3/329

Abstract: A leak detection system for sealed beam headlamp units, each of which has a gas fill including helium, wherein a unit is placed in a test chamber which is evacuated to draw the gas fill through any unit leakage paths into the chamber. A first pressure gauge coupled to the chamber performs a first leakage check. If the pressure is above a predetermined value indicative of a high rate of leakage, the unit is rejected, otherwise, a metered volume of carbon dioxide is injected into the chamber for admixing with any leakage gas fill. After a holding period, the chamber is valved to a cold trap for condensing the carbon dioxide. A second pressure gauge coupled to the cold trap performs a second leakage check test. If the pressure is above a predetermined value indicative of a high leakage rate but less than that of the first check, the unit is rejected, otherwise, the uncondensed gas fill is valved to a mass spectrometer for a final leakage test. The leakage checks are in increasing order of sensitivity. This permits rejection of high rate leaking units without exposing the mass spectrometer to excessive air and helium ingestion.

Abstract translation: 一种用于密封梁头灯单元的泄漏检测系统，每个都具有包括氦气的气体填充，其中将单元放置在被抽真空以将气体填充物通过任何单元泄漏路径抽吸到室中的试验室中。 耦合到室的第一压力表执行第一泄漏检查。 如果压力高于表示高泄漏率的预定值，则该单元被排除，否则，将计量体积的二氧化碳注入室中以与任何泄漏气体填充混合。 在持续时间之后，将腔室压到冷阱以冷凝二氧化碳。 耦合到冷阱的第二压力表执行第二泄漏检查测试。 如果压力高于表示高泄漏率但低于第一次检查的预定值，则该单元被拒绝，否则，将未冷凝的气体填充物压到质谱仪进行最终的泄漏测试。 泄漏检查的灵敏度依次增加。 这允许排除高速泄漏单元，而不会使质谱仪暴露于过量的空气和氦摄入。

公开(公告)号：US3725698A

公开(公告)日：1973-04-03

申请号：US3725698D

申请日：1971-03-02

Applicant: GEN MOTORS CORP

Inventor： CRAIG G

IPC: H01J5/24 ,  H01K1/28 ,  F21M

CPC classification number: H01K1/28 ,  F21S45/50 ,  H01J5/24 ,  H01J2893/0038

Abstract: A sealed beam headlamp wherein the mating areas between component parts are structurally and hermetically joined by a plastic cement overlaid by a metallic moisture barrier, the latter establishing a tortuous moisture flow path of minimal cross section through the cement thereby reducing the rate of moisture diffusion into the lamp envelope and minimizing filament erosion due to ''''water cycle''''.

Abstract translation: 密封梁前照灯，其中组件之间的配合区域通过覆盖有金属防潮屏障的塑料水泥结构地和气密地接合，后者建立了通过水泥的最小横截面的曲折的湿气流动路径，从而降低了水分扩散速率 灯罩，并最大程度地减少由于“水循环”引起的灯丝侵蚀。