200836587 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種超高壓水銀燈，其係使用於一投影 機裝置。 【先前技術】200836587 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an ultrahigh pressure mercury lamp which is used in a projector apparatus. [Prior Art]
在超高壓水銀燈（以下亦稱爲”燈”）中，由於在發光管 中電極的損耗，電極的形狀會改變，且弧光輝點會偏差（arc spot deviation)。在系統運作於交流電的情況下，每一週期 的輝點偏差一般被視爲閃爍（flickering)。 爲了抵消這個問題，已被提出的方法爲，對每一週期 的電流波形加入一疊加脈衝，以增加電極尖端的溫度並最 佳化鹵素週期（halogen cycle)(例如可參閱專利文獻1)。 (專利文獻1) PCT (WO) H10-501919之已公開日文翻譯 然而，藉由專利文獻1的方法，完全無法產生恆定的 電流脈衝亦無法最佳化鹵素週期；不是不可能，相反地， 還有可能在電極上造成大程度的損傷。 【發明內容】 本發明的發展係爲了解決前述這些問題，且目的在於 提供一種超高壓水銀燈，由於所疊加的脈衝之大小是根據 在發光管內部的參數變化而改變，故其不會閃爍並具有較 長壽命0 在本發明的超高壓水銀燈中，一對電極係配置於兩 端，該燈包括一發光管，其內部包含有水銀，且當一交流 燈電流被供應至該超高壓水銀燈及其被開啓電源時，與前 200836587 述交流燈電流相同極性的一電流脈衝被疊加於前述交流燈 電流，且該超高壓水銀燈的燈電壓被偵測，及根據前述燈 電壓値，如果該燈電壓超過一指定-値，被疊加於前述交流 燈電流上的該電流脈衝的寬度或高度、或寬度及高度二者 皆不同於當該燈電壓位於該指定値時該電流脈衝的寬度或 高度、或寬度及高度二者。 本發明的超高壓水銀燈具有前述的配置，藉此因而不 會閃爍並具有較長壽命。In an ultrahigh pressure mercury lamp (hereinafter also referred to as "lamp"), the shape of the electrode changes due to the loss of the electrode in the arc tube, and the arc spot deviation occurs. In the case where the system operates on alternating current, the gain point deviation for each cycle is generally considered flickering. In order to offset this problem, a method has been proposed in which a superimposing pulse is added to the current waveform of each cycle to increase the temperature of the electrode tip and to optimize the halogen cycle (for example, see Patent Document 1). (Patent Document 1) Published Japanese Translation of PCT (WO) H10-501919 However, by the method of Patent Document 1, it is impossible to generate a constant current pulse at all, and it is impossible to optimize the halogen period; it is not impossible, and conversely, It is possible to cause a large degree of damage on the electrodes. SUMMARY OF THE INVENTION The development of the present invention is to solve the aforementioned problems, and an object of the present invention is to provide an ultra-high pressure mercury lamp which does not flicker and has a size because the magnitude of the superimposed pulse changes according to a parameter change inside the arc tube. Longer life 0 In the ultrahigh pressure mercury lamp of the present invention, a pair of electrodes are disposed at both ends, the lamp includes an illuminating tube, the inside of which contains mercury, and an alternating current lamp current is supplied to the ultrahigh pressure mercury lamp and When the power is turned on, a current pulse having the same polarity as the alternating current lamp current of the previous 200836587 is superimposed on the alternating current lamp current, and the lamp voltage of the ultrahigh pressure mercury lamp is detected, and according to the aforementioned lamp voltage, if the lamp voltage exceeds a designation - 値, the width or height, or width and height of the current pulse superimposed on the alternating current lamp current is different from the width or height, or width of the current pulse when the lamp voltage is at the specified chirp And height both. The ultrahigh pressure mercury lamp of the present invention has the aforementioned configuration, whereby it does not flicker and has a long life.
【實施方式】 第1〜5圖顯示實施例1的模式，第1圖爲超高壓水銀 燈1 0部分切開的側視圖；第2圖爲發光管1的截面圖；第 3圖爲供應至超高壓水銀燈1 〇之交流燈電流的波形例示； 第4圖爲燈電壓與電極間距之間的關係例示；及第5圖爲 脈衝寬度與燈電壓之間的關係例示。 如第1圖所示，超高壓水銀燈10包括了發光管1，發 光管1被固定住而使得光學軸與反射鏡5(凹面反射鏡）的頸 部5 a —致，反射鏡5包括了讓光向前方射出的開口部2 0， 由導線4b從發光管1的電極所連接的端子6a與端子6b係 配置於反射鏡5的外圍表面上。用於啓動發光管1的觸發 線圈7係位於發光管1上。一對電極係位於發光管1的內 部，且反射鏡5內部的開口部20側之上的電極構成了第一 電極3a，而反射鏡5內部的頸部5a上的電極構成了第二電 極3b 〇 如第2圖所示，發光管1包括由石英玻璃製成的燈泡 -6- 200836587 8、以及形成延伸於該燈泡8兩端之上的密封部2。燈泡8 內部容納有水銀，且部分的第一電極3a與第二電極3b係 由密封部2所密封。導線4a與導線4b向密封部2的外部 延伸。[Embodiment] Figs. 1 to 5 show a mode of Embodiment 1, and Fig. 1 is a side view showing a portion of the ultrahigh pressure mercury lamp 10 cut; Fig. 2 is a sectional view of the arc tube 1; and Fig. 3 is a view of supply to an ultrahigh voltage. An example of the waveform of the alternating current lamp current of the mercury lamp 1 is shown; Fig. 4 is an illustration of the relationship between the lamp voltage and the electrode pitch; and Fig. 5 is an illustration of the relationship between the pulse width and the lamp voltage. As shown in Fig. 1, the ultrahigh pressure mercury lamp 10 includes an arc tube 1, and the arc tube 1 is fixed such that the optical axis coincides with the neck 5a of the mirror 5 (concave mirror), and the mirror 5 includes The opening portion 20 from which the light is emitted forward is disposed on the outer peripheral surface of the mirror 5 by the terminal 6a and the terminal 6b which are connected from the electrode of the arc tube 1 by the wire 4b. The trigger coil 7 for activating the arc tube 1 is located on the arc tube 1. A pair of electrodes are located inside the arc tube 1, and an electrode on the side of the opening 20 inside the mirror 5 constitutes the first electrode 3a, and an electrode on the neck 5a inside the mirror 5 constitutes the second electrode 3b. As shown in Fig. 2, the arc tube 1 comprises a bulb -6-200836587 8 made of quartz glass and a sealing portion 2 extending over the ends of the bulb 8. The bulb 8 contains mercury inside, and a part of the first electrode 3a and the second electrode 3b are sealed by the sealing portion 2. The wire 4a and the wire 4b extend to the outside of the sealing portion 2.
第3圖顯示供應至超高壓水銀燈1 0之交流燈電流的波 形。在第3圖中，橫軸表示時間，而縱軸表示交流燈電流。 一脈衝被疊加於方波交流燈電流的每一半週期上，藉此便 可最佳化鹵素週期。鹵素週期爲，構成電極材料的鎢會自 電極揮發，及回到電極的頂端並保持電極的形狀；因爲被 疊加的脈衝在每一週期被加入電流波形中，且電極的頂端 升高至適宜溫度。 如前所述，即使當超高壓水銀燈1 0被點亮且脈衝被疊 加於方波交流燈電流的每一半週期上，電極間距因第一電 極3 a或第二電極3 b在使用期間的損傷，而有改變及增加 的趨勢。 電極損傷意指電極的形狀改變以及弧光輝點偏移的產 生，因而造成閃爍。 考慮到此點，一般認爲如果存在電極損傷及發生電極 形狀的改變，便會促進鹵素週期並修復電極損傷。 第4圖顯示燈電壓與電極間距之間的關係例示，燈電 壓與電極間距之間的關係是由下列方程式所表示：Figure 3 shows the waveform of the AC lamp current supplied to the ultra-high pressure mercury lamp 10. In Fig. 3, the horizontal axis represents time and the vertical axis represents alternating current lamp current. A pulse is superimposed on each half cycle of the square wave AC lamp current, thereby optimizing the halogen period. The halogen period is such that the tungsten constituting the electrode material volatilizes from the electrode and returns to the top of the electrode and maintains the shape of the electrode; since the superimposed pulse is added to the current waveform in each cycle, and the tip of the electrode rises to a suitable temperature . As described above, even when the ultrahigh pressure mercury lamp 10 is lit and the pulse is superimposed on each half cycle of the square wave alternating lamp current, the electrode pitch is damaged due to the use of the first electrode 3a or the second electrode 3b during use. And there is a trend of change and increase. Electrode damage means the shape change of the electrode and the generation of the arc spot shift, thus causing flicker. With this in mind, it is generally believed that if there is electrode damage and a change in the shape of the electrode occurs, the halogen period is promoted and the electrode damage is repaired. Fig. 4 shows an example of the relationship between the lamp voltage and the electrode pitch, and the relationship between the lamp voltage and the electrode pitch is expressed by the following equation:
VL = k · m7/12 · la (D 其中： VL:燈電壓 -7- 200836587 k:係數 m:水銀的量 1 a :電極間距 1 a成比例 發光裝置 距之間的 極間距値 設計値爲 亮且沒有 增加至大 的脈衝寬 爲 100% ， 爲 100V， 、抑制電 燈電壓進 5圖所示。 交流燈電 例，但其 的半週期 由方程式（1)可知，燈電壓VL係與電極間距 的。再者，燈電壓VL可藉由超高壓水銀燈1 0的 而被偵測。VL = k · m7/12 · la (D where: VL: lamp voltage -7- 200836587 k: coefficient m: amount of mercury 1 a : electrode spacing 1 a proportional pole spacing between illuminator distances 値 design 値Bright and does not increase to a large pulse width of 100%, is 100V, and suppress the lamp voltage into Figure 5. AC lamp electric example, but its half cycle is known from equation (1), lamp voltage VL system and electrode spacing Furthermore, the lamp voltage VL can be detected by the ultra high pressure mercury lamp 10 .
因此’如第4圖所示，如果燈電壓與電極間 關係係描繪於圖上，可看到的直線上升至較高電 的。關於第4圖所顯示的例子，其中電極間距的 1.3mm’且在燈電壓約爲80(V)的階段燈被開始點 電極損傷。舉例來說，如果電極損傷且電極間距 於1.3mm，則燈電壓會線性升高。 因此，電極損傷可藉由燈電壓而被偵測到。 第5圖顯示燈電壓與被疊加在交流燈電流上 度之間的關係。取當燈電壓爲80V時之脈衝寬度 則脈衝寬度爲一相對値。舉例來說，如果燈電壓約 則脈衝寬度約爲200%。藉此，便可促進鹵素週期 極損傷、幾乎沒有閃爍、且改善使用壽命。如果 \ 一步高於100V，則脈衝寬度也會變得更大，如第: 需要注意的是，在第3圖中，脈衝被疊加在 流的半週期的後半部分上，且雖然此模式爲較佳 爲非必須者，且脈衝亦可以被疊加在交流燈電流 的任何部分上。 在上述所提供的說明中，被疊加之脈衝的寬度會根據 200836587 壓而改變’但高度、或是被疊加之脈衝的寬度與高度 兩者亦可以改變。 【圖式簡單說明】 第1圖顯示實施例1的模式，其爲超高壓水銀燈1 〇部 分被切開上的側視圖； 第2圖顯不實施例丨的模式，其爲發光管1的截面圖；Therefore, as shown in Fig. 4, if the relationship between the lamp voltage and the electrode is plotted on the graph, the visible straight line rises to a higher electric power. Regarding the example shown in Fig. 4, in which the electrode pitch is 1.3 mm' and the lamp is started to be damaged at the stage where the lamp voltage is about 80 (V). For example, if the electrodes are damaged and the electrode spacing is 1.3 mm, the lamp voltage will rise linearly. Therefore, electrode damage can be detected by the lamp voltage. Figure 5 shows the relationship between the lamp voltage and the supercharged current of the AC lamp. Taking the pulse width when the lamp voltage is 80V, the pulse width is a relative 値. For example, if the lamp voltage is about the pulse width is about 200%. As a result, it is possible to promote halogen cycle damage, almost no flicker, and improve service life. If \ step is higher than 100V, the pulse width will also become larger, as in the first: Note that in Figure 3, the pulse is superimposed on the second half of the half cycle of the stream, and although this mode is Preferably, the pulse can also be superimposed on any part of the AC lamp current. In the description provided above, the width of the superimposed pulse will vary according to the 200836587 pressure 'but the height, or the width and height of the superimposed pulses, may also vary. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a mode of Embodiment 1 which is a side view in which a portion of an ultrahigh pressure mercury lamp is cut, and Fig. 2 is a view showing a mode of an embodiment, which is a sectional view of the arc tube 1. ;
第3圖顯示實施例丨的模式，，其爲供應至超高壓水銀 燈1 0之交流燈電流的波形例示； 第4圖顯示貫施例1的模式，其爲在燈電壓與電極間 距之間的關係例示；及 第5圖顯示實施例1的模式，其爲在脈衝寬度與燈電 壓之間的關係例示。 【圖示符號說明】 1 發光管 2 密封部 3a 第一電極 3b 第二電極 4a " 4b 導線 5 反射鏡、 5 a 頸部 6a、6 b 端子 7 觸發線圈 8 燈泡 10 超高壓水銀燈 20 開口部 •9-Fig. 3 is a view showing the mode of the embodiment ,, which is an example of the waveform of the alternating current lamp current supplied to the ultrahigh pressure mercury lamp 10; Fig. 4 is a view showing the mode of the first embodiment, which is between the lamp voltage and the electrode pitch. The relationship is exemplified; and FIG. 5 shows the mode of Embodiment 1, which is an example of the relationship between the pulse width and the lamp voltage. [Description of Symbols] 1 Luminous tube 2 Sealing portion 3a First electrode 3b Second electrode 4a " 4b Conductor 5 Mirror, 5 a Neck 6a, 6 b Terminal 7 Trigger coil 8 Bulb 10 Ultra high pressure mercury lamp 20 Opening •9-