Title:
ELECTROMAGNETIC QUADRUPOLE CIRCUIT WHICH INDEPENDENTLY CORRECTS AC AND DC COMPONENTS OF CORRECTION CURRENT
Document Type and Number:
WIPO Patent Application WO/2002/045411
Kind Code:
A1
Abstract:
An electromagnetic quadrupole circuit for always optimally correcting the shape of a spot by providing a current sensing means (20) for detecting the peak value and the bottom value of a current flowing through an electromagnetic quadrupole coil (8), a control means (50) for supplying a predetermined peak control value and bottom control value, a first power source (16) for feedback control of the amount of a supply current on the basis of the peak value detected by the current sensing means (20) and the peak control value supplied from the control means (50), and a second power source (17) for feedback control of the amount of a supply current on the basis of the bottom value detected by the current sensing means (20) and the bottom control value supplied from the control means (50).
Inventors:
SUZUKI HITOSHI (JP)
Application Number:
PCT/JP2001/010516
Publication Date:
June 06, 2002
Filing Date:
November 30, 2001
Export Citation:
Assignee:
SONY CORP (JP)
SUZUKI HITOSHI (JP)
SUZUKI HITOSHI (JP)
International Classes:
H01J29/56; H04N3/26; (IPC1-7): H04N3/26; H01J29/56
Foreign References:
| JPH05130445A | 1993-05-25 | |||
| JPH04213969A | 1992-08-05 | |||
| JPH03139066A | 1991-06-13 | |||
| JP2000253271A | 2000-09-14 | |||
| JPH02268078A | 1990-11-01 |
Attorney, Agent or Firm:
Tanabe, Shigemoto (Jingumae 1-chome Shibuya-ku, Tokyo, JP)
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