IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0091167
(2006-11-02)
|
등록번호 |
US-7688003
(2010-04-23)
|
우선권정보 |
JP-2005-321224(2005-11-04) |
국제출원번호 |
PCT/JP2006/322021
(2006-11-02)
|
§371/§102 date |
20080422
(20080422)
|
국제공개번호 |
WO07/052770
(2007-05-10)
|
발명자
/ 주소 |
- Yamada, Go
- Ono, Syunsuke
- Ichibakase, Tsuyoshi
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
2 |
초록
▼
An object of the present invention is to provide a lighting method and the like that can prevent a lamp temperature of each individual high-pressure mercury lamp from being beyond a proper temperature range of a halogen cycle. The lighting method maintains a discharge of the high-pressure mercury la
An object of the present invention is to provide a lighting method and the like that can prevent a lamp temperature of each individual high-pressure mercury lamp from being beyond a proper temperature range of a halogen cycle. The lighting method maintains a discharge of the high-pressure mercury lamp that has a function of the halogen cycle. The control is performed as follows. From when the high-pressure mercury lamp is lighted up to when a lamp voltage Vla reaches a first voltage value V1, a constant current control is performed. When the lamp voltage Vla reaches the first voltage value V1, the constant current control is switched to a constant power control which is performed at a first power value W1. While the discharge of the lamp is maintained, when the lamp voltage Vla reaches a voltage value (second voltage value V2) at which a state of the halogen cycle deviates from a proper state, the constant power control is performed by reducing the first power value W1 to a second power value W2.
대표청구항
▼
The invention claimed is: 1. A lighting method for operating a high-pressure mercury lamp that has a function of a halogen cycle, by performing a constant power control when a lamp voltage is equal to or higher than a predetermined voltage value, to maintain a discharge of the high-pressure mercury
The invention claimed is: 1. A lighting method for operating a high-pressure mercury lamp that has a function of a halogen cycle, by performing a constant power control when a lamp voltage is equal to or higher than a predetermined voltage value, to maintain a discharge of the high-pressure mercury lamp, wherein when the lamp voltage increases resulting from a state change of the halogen cycle, a step of shifting a target power value of the constant power control from an immediately previous power value to a smaller power value is performed at least one time, and a subsequent constant power control is performed at the smaller power value as the target power value. 2. The lighting method of claim 1, wherein a range in which the lamp voltage is expected to be varied is divided into a plurality of voltage ranges, and a plurality of power values are set as the target power value in one-to-one correspondence with the voltage ranges, and when the lamp voltage reaches an n-th voltage range resulting from the state change of the halogen cycle, the target power value is shifted to an n-th power value corresponding to the n-th voltage range, where n is a natural number, and as n is larger, the voltage range is higher. 3. The lighting method of claim 2, wherein when the lamp voltage reaches the n-th voltage range resulting from the state change of the halogen cycle, a temperature in a position of the high-pressure mercury lamp is beyond a predetermined proper temperature range of the halogen cycle, the position being a top in a surface of a discharge vessel of the high-pressure mercury lamp operated with a longitudinal direction thereof situated substantially horizontally. 4. The lighting method of claim 2, wherein the high-pressure mercury lamp includes a pair of electrodes, and when the lamp voltage reaches the n-th voltage range resulting from the state change of the halogen cycle, a distance between the pair of electrodes is beyond a predetermined proper distance range. 5. The lighting method of claim 2, wherein the n-th power value is in a range of 80% to 95% of an (n−1)-th power value. 6. The lighting method of claim 4, wherein the n-th power value is in a range of 80% to 95% of an (n−1)-th power value. 7. The lighting method of claim 2, wherein the target power value is shifted stepwise from an (n−1)-th power value to the n-th power value. 8. The lighting method of claim 6, wherein the target power value is shifted stepwise from the (n−1)-th power value to the n-th power value. 9. A lighting apparatus for maintaining a discharge of a high-pressure mercury lamp that has a function of a halogen cycle, the lighting apparatus comprising: a lighting unit operable to, when a lamp voltage is equal to or higher than a predetermined voltage value, perform a constant power control at a predetermined power value as a target power value to maintain the discharge of the high-pressure mercury lamp; and a target power value switching unit operable to shift the target power value of the constant power control from an immediately previous power value to a smaller power value, when the lamp voltage increases resulting from a state change of the halogen cycle, wherein the lighting unit performs a subsequent constant power control at the smaller power value as the target power value. 10. The lighting apparatus of claim 9, wherein a range in which the lamp voltage is expected to be varied is divided into a plurality of voltage ranges, and a plurality of power values are set as the target power value in one-to-one correspondence with the voltage ranges, and when the lamp voltage reaches an n-th voltage range resulting from the state change of the halogen cycle, the target power value is shifted to an n-th power value corresponding to the n-th voltage range, where n is a natural number, and as n is larger, the voltage range is higher. 11. A lamp system comprising: a high-pressure mercury lamp that has a function of a halogen cycle to reduce electrode consumption; and a lighting apparatus for lighting up the high-pressure mercury lamp, wherein the lighting apparatus is the lighting apparatus of claim 9. 12. A lamp system comprising: a high-pressure mercury lamp that has a function of a halogen cycle to reduce electrode consumption; and a lighting apparatus for lighting up the high-pressure mercury lamp, wherein the lighting apparatus is the lighting apparatus of claim 10. 13. A projection type display apparatus comprising: a high-pressure mercury lamp for a light source; and a lighting apparatus for lighting up the high-pressure mercury lamp, wherein the high-pressure mercury lamp has a function of a halogen cycle to reduce electrode consumption, and the lighting apparatus is the lighting apparatus of claim 9. 14. A projection type display apparatus comprising: a high-pressure mercury lamp for a light source; and a lighting apparatus for lighting up the high-pressure mercury lamp, wherein the high-pressure mercury lamp has a function of a halogen cycle to reduce electrode consumption, and the lighting apparatus is the lighting apparatus of claim 10.
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