Displacement measuring device utilizing an incremental code
First Claim
1. A device for measuring displacement characterized in that it comprises:
- a coding member carried by an object to be measured and having an coding section capable of causing sensing elements to generate signals which can be discriminated as "0" and "1";
sensing means arranged to sense the coding section of the coding member and adapted to generate detection signals in response to displacement of the coding member;
rectangular wave-converting means for receiving the detection signals to generate rectangular wave signals;
clock pulse generating means for generating clock pulses of repetition frequency higher than the repetition-frequency of the detection signals;
edge detecting means for receiving the rectangular wave signal and the clock pulse to generate, as an output pulse, a clock pulse substantially coinciding with at least one of the leading and trailing edges of the rectangular wave signal;
a main counter for counting the output pulses from the edge detecting means; and
a display unit for displaying the counted value of the main counter.
1 Assignment
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Accused Products
Abstract
A displacement measuring device, using an incremental code, which includes a coding member (22) resting on the object (21) to be measured and having a coding section for generating such signals that a sensing element can discriminate the signals as 0 or 1, sensing means (25A, 25B) disposed to sense the coding section of the coding member for producing sensed signals in response to the displacement of the coding member (22), and rectangular wave-converting circuits (27A, 27B) for receiving and converting the sensed signal into rectangular wave signals. A clock pulse generator (28) is provided in the device for generating a clock pulse with a higher repetition-frequency than the repetition-frequency of the sensed signal. An edge detector (29) receives the clock pulse from the clock pulse generator (28) and the rectangular wave-signal from the rectangular wave-converting circuits (27A, 27B) and then delivers, as an output pulse, the clock pulse substantially coincident with at least one of the leading edge and the trailing edge of the rectangular wave-signal. A counter (30) counts the output pulses from the edge detector and a display (31) indicates the counted value. With such an arrangement, an incremental displacement measurement can be made without a differentiating circuit and an averaging circuit.
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Citations
21 Claims
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1. A device for measuring displacement characterized in that it comprises:
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a coding member carried by an object to be measured and having an coding section capable of causing sensing elements to generate signals which can be discriminated as "0" and "1"; sensing means arranged to sense the coding section of the coding member and adapted to generate detection signals in response to displacement of the coding member; rectangular wave-converting means for receiving the detection signals to generate rectangular wave signals; clock pulse generating means for generating clock pulses of repetition frequency higher than the repetition-frequency of the detection signals; edge detecting means for receiving the rectangular wave signal and the clock pulse to generate, as an output pulse, a clock pulse substantially coinciding with at least one of the leading and trailing edges of the rectangular wave signal; a main counter for counting the output pulses from the edge detecting means; and a display unit for displaying the counted value of the main counter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification