Lens controlling apparatus

Details Lens controlling apparatus Lens controlling apparatus

1994-06-13

1997-01-14

Martin, David S.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318447, G05B 1940

Patent

active

055943110

ABSTRACT:
A lens controlling apparatus includes a lens-driving stepping motor, a driving current forming circuit for forming a driving current waveform to be supplied to the stepping motor, an inputting circuit for inputting a stop instruction to stop the lens-driving stepping motor, a stopping circuit for performing the operation of stopping the stepping motor in accordance with the stop instruction, a phase detecting circuit for detecting the phase of the driving current waveform to be supplied to the stepping motor, and an inhibiting circuit for inhibiting the stop instruction from being executed except when the phase of the driving current waveform detected by the phase detecting circuit is a predetermined phase.

REFERENCES:
patent: 3601678 (1971-08-01), Abraham
patent: 4272712 (1981-06-01), Beling et al.
patent: 4933985 (1990-06-01), Fukushima
patent: 5285141 (1994-02-01), Hwang

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