JP2000014047A - Encoder and its backup method - Google Patents

Abstract

(57) [Problem] In a conventional encoder and its backup method, a backup capacitor is provided in the encoder case, that is, in the encoder. In this case, the reliability was reduced, and the encoder shape was also enlarged. SOLUTION: In the encoder and the backup method thereof according to the present invention, only the backup capacitor (7) is taken out of the encoder case (1) and arranged at a position away from the encoder case (1) by a lead wire (11) or the like. Thus, the configuration is such that the backup capacitor (7) is prevented from deteriorating by being used in different environments, and the size and shape of the encoder can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoder and a method for backing up the encoder, and more particularly, to installing a backup capacitor at a remote location in an environment such as a temperature different from that of the encoder to prevent the capacitor from deteriorating. The present invention relates to a novel improvement for improving the reliability of operation and removing the restrictions on the shape and dimensions of the encoder itself to achieve miniaturization.

[0002]

2. Description of the Related Art An encoder of this type which has been conventionally used generally has a configuration shown in FIG. That is, what is indicated by reference numeral 1 in FIG. 3 is an encoder case.
In order to output an encoder output signal 3, an encoder detection unit 2 for detecting rotation or linear movement of an optical or magnetic type and a signal processing circuit to which a detection signal 2 a from the encoder detection unit 2 is input are provided. And a backflow preventing diode 6 connected between the main power supply 5 which is an external power supply and the electric circuit 4. further,
A backup capacitor 7 for backing up the power supply when the main power supply 5 is cut off due to a power failure or the like is also built in the encoder case 1.

[0003]

A conventional encoder is:
Because of the above configuration, the following problems exist. That is, since the backup capacitor 7 is built in the encoder case 1 of the encoder, the encoder and the backup capacitor are arranged at the same position as the encoder, that is, the encoder case. In some cases, the backup capacitor is attached to the outer surface of the encoder case by attaching it.However, in any case, the encoder is integrated with the encoder. When used, the capacitor is also under the same environment, so that the capacitor is significantly deteriorated, the life of the capacitor is shortened, and there is a case where backup is not performed when power supply backup is required. Further, when a large-sized capacitor is used for installing the capacitor inside the encoder case, the shape of the encoder itself becomes large, and it has been difficult to reduce the size of the encoder. In addition, the internal configuration of the capacitor limits the shape of the encoder case.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In particular, a backup capacitor is installed at a remote position in an environment such as a temperature different from that of an encoder to prevent deterioration of the capacitor. It is an object of the present invention to provide an encoder and a method of backing up the data by preventing the reliability of the backup operation and improving the reliability of the backup operation, and removing the restrictions on the shape and dimensions of the encoder itself to achieve downsizing.

[0005]

An encoder according to the present invention outputs an encoder output signal after processing a detection signal from an encoder detector for detecting rotation or linear movement by an electric circuit connected to a main power supply. An encoder in which at least the encoder detection unit and the electric circuit are provided in an encoder case, wherein a backup capacitor for performing backup when the main power is shut off is provided outside the encoder case, and the backup capacitor Is connected to a lead wire derived from the encoder case, and
The encoder case is configured to be provided at a position separated from the encoder case, and the lead wire is configured to be connected between a diode connected to the main power supply and an electric circuit. The backup capacitor is configured to be directly connected to the main power supply, and after processing a detection signal from an encoder detection unit that detects rotation or linear movement by an electric circuit connected to the main power supply,
In addition to outputting an encoder output signal, at least the encoder detecting unit and the electric circuit are provided in an encoder case, and a backup capacitor for backing up when the main power is turned off is separated from the encoder case, and the encoder case And a method in which the environment is a temperature.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an encoder and a backup method thereof according to the present invention will be described below with reference to the drawings. Note that the same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, a reference numeral 1 denotes an encoder case. In the encoder case 1, a known encoder detection unit 2 that detects optical or magnetic rotation or linear movement, and an encoder detection unit 2. An electric circuit 4 for outputting an encoder output signal 3 comprising a signal processing circuit or the like to which the detection signal 2a is inputted, and a backflow prevention circuit connected between the main power supply 5 which is an external power supply and the electric circuit 4 A diode 6 is provided inside.

Outside the encoder case 1, a connection point 10 between the diode 6 and the electric circuit 4 is provided via a lead wire 11 for power backup when the main power supply 5 is cut off due to a power failure or the like. Backup capacitor 7
Is connected. This lead wire 11 has several meters to several
For example, an encoder, that is, an encoder case 1 is a factory robot (not shown).
And is located in a high-temperature environment, but the backup condenser 7 is several meters or several tens of meters away from this robot.
It is installed at a position where the temperature is at a low distance of m. for that reason,
The backup capacitor 7 does not deteriorate due to high temperature and maintains stable performance, and the capacity of the backup capacitor 7 can be made larger than in the past, thereby improving reliability.

In another embodiment shown in FIG. 2, the backup capacitor 7 is directly connected to the main power supply 5 via a lead wire 11, and this lead wire 11 is connected to the main power supply 5
Wiring is used as it is. Since other parts are the same as those in FIG. 1, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

[0009]

The encoder and the backup method thereof according to the present invention are configured as described above, so that the following effects can be obtained. That is, since only the backup capacitor is located at a position away from the encoder, the backup capacitor can be placed in a different environment such as a lower temperature than in an environment such as a high temperature where the encoder is placed. This can extend the life of the backup function and improve reliability. Further, the capacity of the backup capacitor can be made larger than before, and the life can be extended. Furthermore, since the backup capacitor is provided outside the encoder case, the size and shape of the encoder itself can be made smaller than before.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an encoder and a backup method thereof according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of FIG. 1;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Encoder case 2 Encoder detection part 3 Encoder output signal 4 Electric circuit 5 Main power supply 6 Diode 7 Backup capacitor 11 Lead wire

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Muneaki Kubota 1879 Oikyu, Iida City, Nagano Prefecture Inside the Tamagawa Seiki Co., Ltd. Terms (reference) 2F077 AA24 AA41 AA42 WW03 5G015 FA06 JA61 5J022 DA02 DB01 DC01 DD00

Claims (6)

[Claims] An encoder output signal (3) is processed after a detection signal (2a) from an encoder detector (2) for detecting rotation or linear movement is processed by an electric circuit (4) connected to a main power supply (5). ), And at least the encoder detector (2) and the electric circuit (4) in an encoder provided in the encoder case (1), a backup capacitor for backing up when the main power supply (5) is shut off ( 7)
Provided outside the encoder case (1). 2. The backup capacitor (7) is connected to a lead (11) derived from the encoder case (1), and is provided at a position separated from the encoder case (1). 2. The encoder according to claim 1, wherein: 3. The electric power supply according to claim 2, wherein the lead wire is connected between a diode connected to the main power supply and an electric circuit. Encoder. 4. The encoder according to claim 1, wherein said backup capacitor is directly connected to said main power supply. 5. An encoder output signal (3) after processing a detection signal (2a) from an encoder detector (2) for detecting rotation or linear movement by an electric circuit (4) connected to a main power supply (5). ), And at least the encoder detection unit (2) and the electric circuit (4) are provided in the encoder case (1) in the encoder provided in the encoder case (1). ) Is separated from the encoder case (1) and used in an environment different from that of the encoder case (1). 6. The method according to claim 5, wherein the environment is a temperature.