Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-03-30
1990-11-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
049720805
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a signal processing apparatus for a pulse encoder, more particularly, to a signal processing apparatus for a pulse encoder for electrically processing an output signal from a signal generating source and improving the resolution of the encoder.
A pulse encoder is mainly used for an NC machine tool, an industrial robot, and the like. A rotary pulse encoder mounted on a shaft of a motor or the like and a linear pulse encoder mounted on a machining table or the like, are generally known. A signal processing apparatus for a pulse encoder according to the present invention can be used for both the rotary and linear pulse encoders.
BACKGROUND ART
A signal processing technique for electrically processing a sine-wave signal and a cosine-wave signal supplied from a signal generating source for a pulse encoder, and improving the resolution of the encoder is conventionally known.
A conventional signal processing apparatus for a pulse encoder comprises, for example, a rotary code plate mounted on a shaft of a motor or the like, in which a plurality of slits are formed, a fixed code plate in which a plurality of slits are formed, a signal generating source having a light-emitting diode and a photodiode, and a signal processing apparatus. The signal processing apparatus comprises a plurality of resistor and comparator array, and the resolution of the encoder is increased by the resistors and the comparator array. For example, when the resolution of the encoder is increased 10 times, 20 circuits each comprising resistors and a comparator are required, and 20 types of signals each having different phases are generated.
When the resolution of the encoder is increased 10 times, for example, 60 resistors and 20 comparator are required in order to improve the resolution of the encoder. Therefore, the cost required for the resistors and the comparator array is increased and the signal processing apparatus becomes bulky. In addition, the conventional signal processing apparatus for the pulse encoder cannot confirm the intensity of a signal supplied from the signal generating source. Therefore, when a signal having an insufficient intensity is processed, an erroneous pulse signal is often output.
DISCLOSURE OF THE INVENTION
In consideration of the above problems of the conventional signal processing apparatus for the pulse encoder, it is an object of the present invention to provide a signal processing apparatus for a pulse encoder to achieve a simple circuit arrangement and reduction of the circuit size, and confirm the intensity of a signal supplied from a signal generating source.
According to the present invention, there is provided a signal processing apparatus for a pulse encoder, comprising a first A/D converter for converting a sine-wave signal supplied from a signal generating source into a digital signal, a second A/D converter for converting a cosine-wave signal supplied from the signal generating source into a digital signal, and a signal converting means for receiving outputs of the first and second A/D converters and outputting an analog amplitude level and position data in response to the outputs from the first and second A/D converters, respectively.
In a signal processing apparatus for a pulse encoder having the above arrangement according to the present invention, the sine-wave signal supplied from the signal generating source is converted into a digital signal by the first A/D converter, and the cosine-wave signal supplied from the signal generating source is converted into a digital signal by the second A/D converter. The signal converting means receives outputs from the first and second A/D converters and outputs an analog amplitude level and position data from the outputs from the first and second A/D converters, respectively.
Therefore, the circuit arrangement can be simplified and the circuit size can be reduced. Since an analog amplitude level can be confirmed in addition to position data, for example, an erroneous pulse signal obtained when a signa
REFERENCES:
patent: 4346447 (1982-08-01), Takahama
patent: 4360730 (1982-11-01), Breslow
patent: 4587485 (1986-05-01), Papiernik
patent: 4782329 (1988-11-01), Iijima
Fanuc Ltd.
Hsia Sherrie
Nelms David C.
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