Driving circuit for vibration type actuator apparatus

Details Driving circuit for vibration type actuator apparatus Driving circuit for vibration type actuator apparatus

1999-05-24

2001-05-08

Grimm, Siegfried H. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C310S316020, C318S114000, C331S045000, C331S154000

Reexamination Certificate

active

06229402

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates a driving circuit for a vibration type actuator and mounting of the driving circuit.
2. Related Background Art
Conventionally, as an oscillating means forming a driving circuit for a vibration type actuator, a means using a VCO or a means for frequency-dividing an high-frequency pulse signal and outputting the resultant signal has been used.
Since the frequency of such an analog oscillating means has a high temperature dependency, when the oscillating means is integrated with a power amplification means, the frequency precision decreases. A VCO using a quartz oscillator suffers a narrow frequency setting range. In addition, when frequencies are to be set by digitally dividing the frequency of the quartz oscillator, the resolution of the resultant frequencies is low. Such frequencies are unsuited to control the speed of a vibration type actuator.
Furthermore, a conventional driving circuit for a vibration type actuator is comprised of a combination of discrete electronic parts, and different parts are connected and used as a power amplification means, a CPU for controlling the operation of the vibration type actuator, an oscillating means, and the like.
Since a plurality discrete parts are used, a circuit board requires a large mounting area. In addition, since it takes much time to mount the parts on the circuit board, the manufacturing cost of the circuit board increases. Under the circumstances, the respective parts may be integrally mounted. As described above, however, since the frequency of the analog oscillating means has a high temperature dependency, if the oscillating means and the power amplification means are integrated, the frequency precision decreases. In addition, the VCO using the quartz oscillator suffers a narrow frequency setting range. It is therefore difficult to integrally mount these parts. Furthermore, if a circuit for setting frequencies by digitally dividing the frequency of a quartz oscillator is used, the problem of the temperature dependency can be solved. However, in a circuit using such a method, the resolution of frequencies is low, and hence this circuit is unsuited to control the speed of the vibration type actuator.
SUMMARY OF THE INVENTION
According to one aspect of the application, there is provided a pulse generating circuit for a vibration type motor, which can generate high-resolution frequencies by digital processing or a driving apparatus having the circuit.
According to one aspect of the application, there is provided a pulse signal forming circuit comprising a reference pulse generating circuit for generating a reference pulse signal, a frequency dividing circuit for outputting a pulse signal having a period of an integer multiple of a period of the reference pulse signal, and a time delaying circuit for generating a delayed pulse signal by changing a shift amount of an edge of a pulse signal from the frequency dividing circuit on the basis of delay data every time a pulse signal is output from the frequency dividing means, the time delaying circuit including pulse forming means for forming a plurality of pulses shifted from each other on a unit time basis and selecting means for selecting one of the pulses formed by the pulse forming means on the basis of delay data, wherein a pulse signal corresponding to a period of the selected pulse is formed as the delayed pulse signal.
According to one aspect of the application, there is provided a driving circuit in which the pulse forming circuit and power amplification means for amplifying power of a pulse signal from the pulse forming circuit are formed on one heat radiation means.
The above and other objects, features, and advantages of the present invention will be apparent from the following detailed description in conjunction with the accompanying drawings and the appended claims.


REFERENCES:
patent: 5013982 (1991-05-01), Sasaki
patent: 5134348 (1992-07-01), Izukawa et al.

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