Title:
MAGNETIC REVERSAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP3114007
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a magnetic reversal display device capable of imparting a sufficient reverse driving force for reversibly driving a big display plate without depending on the characteristics of a semi-hard magnetic material such as the remanent magnetic flux density, coercive force, magnetic permeability or the like.
SOLUTION: In a magnetic reverse display device provided with a display plate 1 having different colors in front and back surfaces supported so as to be reversed, permanent magnets 2 and 3 respectively provided in both ends of the display plate 1, yokes 8 provided in positions respective facing both permanent magnets 2 and 3 and an electromagnetic device 7 for exciting these yokes 8 to be applied to both permanent magnets 2 and 3 and reversibly driving the display plate 1, each of the yokes 8 is composed of a combination between a main yoke 8a made of a semi-hard magnetic material and an auxiliary yoke 8b made of a soft magnetic material.
Inventors:
Akihiro Ito
Mikio Amakasu
Mikio Amakasu
Application Number:
JP19195795A
Publication Date:
December 04, 2000
Filing Date:
July 27, 1995
Export Citation:
Assignee:
Seiko Precision Co., Ltd.
International Classes:
G09F11/22; G09F9/37; G09F11/23; G09F11/34; (IPC1-7): G09F11/23; G09F9/37
Domestic Patent References:
| JP5662287A | ||||
| JP58144889A | ||||
| JP2103086A | ||||
| JP267516A | ||||
| JP4947868A | ||||
| JP58114087A |
Attorney, Agent or Firm:
Kazuko Matsuda