Electronic display unit

Details Electronic display unit Electronic display unit

1994-05-25

1995-12-12

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

31856825, 318 14, 318 15, 318280, 318282, H02P 517

Patent

active

054757878

ABSTRACT:
There is disclosed an electronic display unit wherein a motor driving portion including a CPU and a driving IC controls a drive current to a motor (11) so that the motor (11) initially rotates at a low speed and subsequently rotates at a high speed to switch the speed of rotation of a case (3) from a low speed to a high speed, whereby operability is ensured if a rotation control switch is disposed on a front surface of the case (3), preventing conventionally increased size of the unit as well as alleviating user's feeling that rotation requires too much time.

REFERENCES:
patent: 4031437 (1977-06-01), Dempsey et al.
patent: 4881018 (1989-11-01), Kato et al.
patent: 4983890 (1991-01-01), Satoh et al.
patent: 4998049 (1991-03-01), Chapman
patent: 5027049 (1991-06-01), Pratt et al.
patent: 5194789 (1993-05-01), Barrs

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