JPH06331383A - Incremental encoder - Google Patents

Abstract

PURPOSE:To obtain an incremental encoder which achieves a lowering of a transient in the restarting after the return of a power source. CONSTITUTION:Three reference holes are formed in the circumferential direction on different concentric circles of a rotary plate 14 with a phase difference of 120 deg. and three sets of light emitting/receiving elements 5a-5e and 6a-6e and a signal processing section 7 are provided according to the reference holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incremental encoder, which is useful for detecting the current position of a stick applied to a flight control system of an aircraft, for example.

[0002]

2. Description of the Related Art For example, an incremental decoder is used to detect the current position of an aircraft stick.

FIG. 4 is an explanatory view conceptually showing an increment type decoder according to the prior art. As shown in the figure, the stick 1 is configured to be positioned at the reference position by the centering mechanism 2 and to be rotatable about the central axis 3. The rotating plate 4 has a central shaft 3
5 is a disk-shaped member that is rotatable around the
As shown in FIG. 3, a large number of holes 4a and 4b are provided on the disc surfaces on two concentric circles concentric with the central axis 3, and one reference hole 4c serving as a reference on another concentric circle different from the concentric circles.
Is provided.

One set of the light emitting elements 5a, 5b, 5c is provided on one side of the rotary plate 4 so as to correspond to the number of the concentric circles (three in this example) so that the rotary plate 4 is irradiated with light. It is provided. The light receiving elements 6a, 6b, 6c are arranged on the other side of the rotary plate 4 so as to correspond to the light emitting elements 5a to 5c with the rotary plate 4 interposed therebetween, and the light receiving elements 6a, 6b and 6c are transmitted through the holes 4a to 4c. It is configured to receive light and generate a pulse signal according to the number thereof.

The signal processing section 7 has an optical / electrical converter 7a and a counter 7b, and the optical / electrical converting section 7a converts the pulse signal which is the output signal of the light receiving elements 6a, 6b, 6c into an electric signal. Along with the counter 7b, the light receiving element 6c
The absolute position of the stick 1 is detected from the reference position and the position increase / decrease signal by counting the number of pulse signals sent from the light-receiving elements 6a and 6b with reference to the pulse signal sent by. The counter 7b is reset by the reset signal S _r .

Thus, the light emitting / receiving elements 5a and 6a are connected to the A phase,
The light emitting and receiving elements 5b and 6b are set to the B phase, and the light emitting and receiving elements 5c and 6b.
When c is the Z phase, the holes 4a, 4b, 4a, 4b, so that the pulse signal accompanying the rotation of the stick 1 becomes as shown in FIG.
The relative positional relationship of 4c is set.

[0007]

In the increment type decoder, the counter 7b is reset when the power is cut off. Therefore, the absolute position cannot be detected after the power is restored, and it is necessary to mechanically return the stick 1 to the reference position.

However, in the increment type encoder according to the prior art, the hole 4c for detecting the reference position has three holes.
Since there is only one at 60 °, a large transient is generated and it takes time.

In view of the above-mentioned conventional technique, it is an object of the present invention to provide an increment type decoder capable of reducing transients at the time of re-operation after power is restored.

[0010]

In order to achieve the above object, the structure of the present invention provides a large number of holes in a disk surface concentric with the central axis, and serves as a reference on another concentric circle different from the concentric circle. A rotary plate provided with a reference hole so as to be rotatable about a central axis, and arranged on one side of the rotary plate so as to correspond to the number of the concentric circles on the rotary plate to direct light toward the rotary plate. A set of light-emitting elements for irradiation and a light-emitting element arranged on the other side of the rotary plate so as to sandwich the rotary plate and correspond to the light-emitting elements. In an incremental encoder having a set of light receiving elements for generating and a signal processing means for counting the pulse signals and detecting an absolute position accompanying rotation of a rotating plate,
A plurality of the reference holes are equidistantly arranged on different concentric circles in the circumferential direction, and a number of sets of light-emitting elements and light-receiving elements corresponding to the number of the reference holes and signal processing means are provided. To do.

[0011]

According to the present invention having the above-described structure, since the plurality of reference holes and the light emitting / receiving elements and the signal processing means corresponding to this number are provided, until the position of any of the reference holes is detected after the power is restored. Just return the rotating plate.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the same parts as those of the conventional technique are denoted by the same reference numerals, and overlapping description will be omitted.

As shown in FIGS. 1 and 2, the rotary plate 14 according to this embodiment has holes 4a and 4b similar to the conventional one,
It has three reference holes 14c, 14d and 14e formed on different concentric circles with a phase difference of 120 °. Hereinafter, the portions related to the reference holes 14c, 14d, and 14ce will be referred to as Z ₁ phase, Z ₂ phase, and Z ₃ phase, respectively.

Light emitting / receiving elements 5a-5c and 5d, 5e, 6
This group consisting of a to 6c and 6d and 6e is the above Z
Three sets are provided at positions having a mutual phase difference of 120 ° corresponding to the _{1 to} Z ₃ phases, and correspondingly, the signal processing unit 7 is provided.
There are also three sets.

Thus, A accompanying the rotation of the stick 1.
Phase, the pulse signal of the B phase and Z ₁ to Z ₃ phase is as shown in FIG.

In the above embodiment, three sets of light emitting elements 5a are used.
To 5e, the holes 4a and 4b of the rotary plate 14 are irradiated respectively.
Also, the light transmitted through the reference holes 14c, 14d, and 14e is incident on the three sets of light receiving elements 6a to 6e, so that pulse signals as shown in FIG. 3 are obtained. Each counter 7b has Z ₁ ...
The absolute position from each reference position is detected by counting the pulse signals of any one of the Z ₃ phases. Therefore, power-off, but the counter 7b is reset, after power restoration may resume rediscovery by returning the stick 1 to the nearest reference position of Z ₁ to Z ₃ phase.
That is, according to this embodiment, the stick 1 which is ⅓ of the conventional one
The predetermined detection can be restarted by the rotation amount of.

In the above embodiment, the Z phase is changed to Z _{1 to} Z ₃ .
Although systematically constructed, it is no wonder that there is no special limit to this number if there are multiple.

[0018]

As described above in detail with the embodiments, according to the present invention, not only the transient after power restoration can be significantly reduced, but also the fail operation by the multiple system is established. You can

[Brief description of drawings]

FIG. 1 is an explanatory view conceptually showing an embodiment of the present invention.

FIG. 2 is an AA line arrow view of FIG. 1 showing a rotating plate extracted.

FIG. 3 is a waveform diagram showing a pulse signal obtained according to an example of the present invention.

FIG. 4 is an explanatory view conceptually showing a conventional technique.

5 is a BB line arrow view of FIG. 4 showing a rotating plate extracted.

FIG. 6 is a waveform diagram showing a pulse signal obtained by a conventional technique.

[Explanation of symbols]

 3 central axis 4a, 4b hole 5a, 5b, 5c, 5d, 5e light emitting element 6a, 6b, 6c, 6d, 6e light receiving element 7 signal processing unit 14 rotating plate 14c, 14d, 14e reference hole

Claims (1)

[Claims] 1. A rotation formed so as to be rotatable about a central axis by providing a large number of holes on a disk surface concentric with the central axis and providing reference holes on another concentric circle different from the concentric circle. A plate, one set of light-emitting elements arranged on one side of the rotary plate in correspondence with the number of the concentric circles on the rotary plate, and irradiating the rotary plate with light; and the other of the rotary plates. A pair of light-receiving elements, which are arranged corresponding to the light-emitting elements with the rotating plate sandwiched between them, and which receive the light transmitted through the holes and generate pulse signals according to the number; and the pulse signals are counted. In addition, in an increment type encoder having a signal processing means for detecting an absolute position accompanying the rotation of the rotary plate, a plurality of reference holes are provided on different concentric circles in the circumferential direction at equal intervals, and the reference holes are provided. The number of light-emitting elements and The set of light receiving elements, and the increment-type encoder, characterized in that a signal processing unit.