JP3986347B2 - Absolute encoder signal output method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal output method of an absolute encoder, and in particular, by delaying the change point of an LSB signal in an absolute signal that changes simultaneously in all bits from the change point of other bits, the output signal of a conventional old type encoder It is related with the new improvement in order to be able to make it the same output system and to have compatibility with the conventional old type encoder.
[0002]
[Prior art]
Conventionally, this type of encoder is generally used in the process of converting an alternating binary code written on a disk into a pure binary code as shown in the timing chart of FIG. The LSB signal 10 of bit 0 of the absolute signal 20 is configured to change last with a delay from the other bits.
Another type of encoder that has recently been used is configured to output serial data, convert it back to parallel, and use all the bits including the LSB signal at the same time. .
[0003]
[Problems to be solved by the invention]
Since the conventional encoder is configured as described above, the following problems exist.
That is, as described above, since the old type encoder used before changed the LSB signal later than the other bits, it became stable by taking in all the data at the change point of the LSB. Although the data can be captured, in the configuration where the data is output by serial communication and converted to parallel again, as in a recent encoder, all bits including the LSB signal change at the same time. Therefore, recent encoders cannot be replaced with older encoders , and it has been impossible to make them compatible. Therefore, even when a conventional encoder with an expensive wooden pattern is broken and replaced, only a large and expensive encoder can be used.
[0004]
The present invention has been made to solve the above-described problems, and in particular, by delaying the change point of the LSB signal in the absolute signal that changes simultaneously at all bits from the change point of other bits, It is an object of the present invention to provide a signal output method for an absolute encoder that can use the same receiving circuit as the output signal of the encoder and is compatible with an old type encoder.
[0005]
[Means for Solving the Problems]
The signal output method of the absolute encoder according to the present invention is a method of delaying the change point of the LSB signal in the absolute signal in which all bits change at the same time from the change point of the other bits, and the absolute signal is obtained from a serial signal. In this method, the LSB signal is updated by a delay clock delayed from the other clock update clock by the signal delay means after being converted into a parallel signal .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a signal output method of an absolute encoder according to the present invention will be described with reference to the drawings.
That is, although not shown in the absolute signal output method of the absolute encoder according to the present invention, all the bits change simultaneously in the process of converting a code written on a well-known disk (not shown) into a pure binary code. In the signal output configured as described above (that is, in a state different from the conventional method of FIG. 2), only the change point of the LSB signal 10 of bit0 is delayed by the time T from the change point of other bits. The absolute signal 20 that can be received by the same receiving circuit as that of the old type absolute encoder can be obtained.
[0007]
In order to delay only the LSB signal 10 in the absolute signal 20 with respect to other bits, although not shown, it can be configured as follows as an example.
That is, since the absolute signal 20 is output as a serial signal, after the serial signal is converted into a parallel signal as shown in FIG. 1, the other bits are updated by a signal delay means such as a well-known timer (not shown). By updating the LSB signal 10 with a delayed clock delayed from the clock, only the LSB signal 10 is delayed as shown in FIG.
Therefore, by outputting the absolute signal 20 as shown in FIG. 1, it is possible to obtain the absolute signal 20 having the same configuration as the timing chart of the conventional old type absolute signal 20 shown in FIG. by applying the present invention method with respect to an absolute encoder, it is possible to obtain the compatibility with the conventional former type absolute encoder.
[0008]
【The invention's effect】
Since the absolute encoder signal output method according to the present invention is configured as described above, the following effects can be obtained.
That is, by delaying only the change point of the LSB signal, which is bit 0 in each bit of the absolute signal converted from the serial signal to the parallel signal, from the other bits, it becomes the same as the timing chart of the conventional absolute signal. This absolute encoder can be made compatible with the conventional absolute encoder.
Therefore, a large and expensive absolute encoder used in the past can be replaced with a recent small and inexpensive absolute encoder.
[Brief description of the drawings]
FIG. 1 is a timing chart of an absolute signal according to a signal output method of an absolute encoder according to the present invention.
FIG. 2 is a timing chart of an absolute signal according to a signal output method of a conventional old type absolute encoder.
[Explanation of symbols]
10 LSB signal 20 Absolute signal

Claims (1)

A method of delaying the change point of the LSB signal (10) in the absolute signal (20) in which all the bits change simultaneously from the change point of the other bits , wherein the absolute signal (20) is converted from a serial signal to a parallel signal. A signal output method for an absolute encoder, wherein the LSB signal (10) is updated by a delay clock delayed from the update clock for the other bits by a signal delay means after the conversion to .

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