Title:
ACTUATOR DRIVING CIRCUIT
Document Type and Number:
Japanese Patent JPS6415817
Kind Code:
A
Abstract:
PURPOSE:To stably keep the controlled position of an actuator by driving this actuator after providing an A/D converter, a memory which is freely latched, and a D/A converter on a front stage. CONSTITUTION:The input analog signal is converted into the digital signal by an A/D converter 5 and stored in a memory circuit 4 by a latch signal 7 of the control/hold selection signal. When no signal 7 is available, the immediate ly preceding digital signal is held by the memory 4. The contents of the circuit 4 are supplied via an amplifier 2 and an actuator 1 is driven in response to position setting action. In such a constitution, the controlled position of the actuator can be held for a long time with high accuracy.
Inventors:
HOSAKA SUMIO
HOSOKI SHIGEYUKI
TAKADA KEIJI
HOSOKI SHIGEYUKI
TAKADA KEIJI
Application Number:
JP17094187A
Publication Date:
January 19, 1989
Filing Date:
July 10, 1987
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G01N23/00; F02D45/00; G01Q10/02; G01Q10/06; G01Q60/10; G05D3/00; G05D3/12; H01J37/20; H01L41/08; H01L41/09; H02N2/00; (IPC1-7): G01N23/00; G05D3/00; G05D3/12; H01J37/20; H01L41/08; H02N2/00
Attorney, Agent or Firm:
Katsuo Ogawa