JP2003294493A - Encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To change logic circuit data by providing a rewritable logic element for an output circuit and to acquire encoder output signals of different resolutions in one output circuit. <P>SOLUTION: In this encoder, the output circuit (5) is provided with the rewritable logic element (10). By changing logic circuit data (11 and 11a) of the rewritable logic element (10), different types of the encoder output signals (5a) are outputted. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an encoder,
In particular, the present invention relates to a novel improvement for providing a rewritable logic element in an output circuit section and changing internal logic circuit data so that a plurality of types of encoder output signals can be output from one output circuit section.

[0002]

2. Description of the Related Art As an encoder of this type which has been conventionally used, the configuration shown in FIGS. 2 and 3 has been generally adopted. That is, the reference numeral 1 in FIG. 2 is a light emitting element such as an LED, and light 2 from this light emitting element 1 is received by a light receiving element 4 via a rotating or linearly moving disk 3, and this light receiving element Output signal 4 from 4
a is signal-processed by the output circuit unit 5 having pure binary logic circuit data and is output as the encoder output signal 5a.

In the other conventional configuration of FIG. 3, the resolution of the disk 3 is changed from that of FIG. 2, and the logic circuit of the output circuit section 5 is different from that of FIG. 2 for BCD output. has been changed.

[0004]

The conventional encoder is
Since it was configured as described above, there were the following problems. That is, in order to make encoders with different resolutions, different disks had to be prepared and a plurality of types of encoders had to be prepared, and output circuit units having different logic circuits had to be prepared. Therefore, the management of parts when manufacturing an encoder is complicated,
At the same time, it was difficult to improve productivity.

The present invention has been made to solve the above problems. In particular, a rewritable logic element is provided in an output circuit section, and internal logic circuit data is changed to output a plurality of types of encoder output signals. An object of the present invention is to provide an encoder capable of outputting from one output circuit section.

[0006]

An encoder according to the present invention receives light from a light emitting element by a light receiving element via a rotating or linearly moving disk, and outputs an output signal from the light receiving element by an output circuit section to an encoder output. In an encoder configured to perform signal processing on a signal and output the signal, a rewritable logic element is provided in the output circuit unit, and different types of encoder output signals can be obtained by changing logic circuit data of the rewritable logic element for each specification. The configuration is such that the same rewritable logic element can output, and the logic circuit data is externally changed, and a plurality of the logic circuit data is written in the rewritable logic element. The configuration is such that the respective logic circuit data are switched from the outside.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an encoder according to the present invention will be described below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example are designated by the same reference numerals for description. Reference numeral 1 in FIG. 1 denotes a light emitting element such as an LED, and light 2 from this light emitting element 1 is received by a light receiving element 4 via a rotating or linearly moving disk 3.
An output signal 4a from the light receiving element 4 is input to an output circuit section 5 having a rewritable logic element (EPLD) 10, processed as a signal, and output as an encoder output signal 5a.

The disk 3 has, for example, a disk structure having a slit of high resolution including the conventional resolutions of FIGS. 2 and 3, and is of a transmission type or a reflection type. The rewritable logic element 10 is configured so that the logic circuit data 11 and 11a can be freely changed so that the resolution can be changed.

That is, in order to be able to output the encoder output signals 5a of different types, the logic circuit data 11 and 11a are also, for example, 256 C / T pure 2.
You can set the hex format and 360C / T BCD format,
It is configured so that the case of rewriting from the outside and the case of rewriting from the outside as needed can be switched to any of the plurality of logic circuit data 11 and 11a already written inside.

Therefore, when changing to the logic circuit data 11 of the rewritable logic element 10, for example, the encoder output signal 5a shown in FIG. 2 is output, and when changing to the logic circuit data 11a, for example, the figure An encoder output signal 5a indicated by 3 is output.

[0011]

Since the encoder according to the present invention is constructed as described above, the following effects can be obtained. That is, since the rewritable logic element provided in the output circuit section can be provided to change the internal logic circuit data, if the disc itself is a high resolution disc that can handle high resolution, the resolution lower than that of this disc In that case, the encoder output signal can be output by freely rewriting with one output circuit unit.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an encoder according to the present invention.

FIG. 2 is a configuration diagram showing a conventional encoder.

FIG. 3 is a configuration diagram showing another conventional encoder.

[Explanation of symbols]

1 Light emitting element 2 light 3 discs 4 Light receiving element 4a output signal 5 Output circuit section 5a Encoder output signal 10 Rewritable logic element 11, 11a Logic circuit data

Claims (3)

[Claims] 1. A light receiving element (4) receives light (2) from a light emitting element (1) through a rotating or linearly moving disk (3), and outputs a signal (4a) from the light receiving element (4). ), The output circuit section (5) performs signal processing on the encoder output signal (5a) and outputs the signal.In the encoder, the output circuit section (5) is provided with a rewritable logic element (10), Logic circuit data of element (10) (1
An encoder characterized in that different encoder output signals (5a) of different types can be output by the same rewritable logic element (10) by changing (1, 11a). 2. The encoder according to claim 1, wherein the logic circuit data (11, 11a) is externally changed. 3. A plurality of the logic circuit data (11, 11a) are written in the rewritable logic element (10), and the logic circuit data (11, 11a) are switched from the outside. The encoder according to claim 1, wherein: