JP2003008053A - Rotary photocoupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary photocoupler capable of transmitting/receiving light between a rotor side and a stator side bilaterally in a plurality of circuits through light-emitting sections and light-receiving sections both installed in annular dark rooms. SOLUTION: This rotary photocoupler has a rotor frame mounted on a rotor shaft and a stator frame engaged with the rotor frame relatively rotating or stopping freely by commonly sharing the axis of the rotor shaft. Further, the photocoupler is provided with an annular dark room centered by the rotor shaft between the rotor frame and the stator frame; an annular light-emitting section which is located inside the dark room on one side of the rotor frame or the stator frame, is centered by the rotor shaft, and flashed according to a signal; and an annular light-receiving section which is located at a position facing to the annular light emitting section on the other side of the stator frame of the rotor frame, and receives the flashing light from the annular light emitting section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating photocoupler capable of transmitting and receiving a signal by bidirectional light with a plurality of lines between a rotating side and a fixed side.

[0002]

2. Description of the Related Art Conventionally, a method using a brush and a slip ring or a rotary transformer has been used to send and receive a signal between a rotating side and a fixed side. There is a problem of wear or noise generation due to contact, maintenance is complicated,
The rotary transformer has a limit to speeding up the signal. On the other hand, as shown in FIG. 6, a dark room 64 is formed by a stator 62 and a rotor 63 arranged on one rotating shaft 61.
And a photocoupler for rotation 60 in which a light emitting element 65 provided in the stator 62 and a light receiving element 66 provided in the rotor 62 are arranged on the rotating shaft 61 in the dark chamber 64 so as to face each other, or As shown in FIG. 7, a stator 72 and a rotor 73 arranged on one rotating shaft 71.
To form a dark room 74, and the rotating shaft 7 in the dark room 74
One end of the optical fiber 75 provided on the stator 72 and one end face of the optical fiber 77 provided on the rotor 73 are opposed to each other, and the light emitting element 76 and the light receiving element 78 are arranged on the other end surface of each of them. The coupler 70 enables high-speed non-contact signal transmission / reception.

[0003]

However, in the conventional rotating photocouplers 60 and 70 having the above structure, signals are transmitted and received on one rotating shaft 61 and 71, so that only one direction and one line are realized. It is possible, and transmission / reception of signals in both directions and multiple lines was mechanically impossible. Further, if the central portion of the hollow shaft or the like cannot be used, it is not possible to transmit and receive signals by continuous light.

The present invention has been made in view of the above circumstances.
It is an object of the present invention to provide a rotating photocoupler capable of transmitting and receiving light between a rotating side and a fixed side by a plurality of lines and bidirectionally.

[0005]

In order to achieve the above object, in the invention according to claim 1, a rotor frame attached to a rotor shaft and an axis center of the rotor shaft are shared by the rotor frame. In a rotating photocoupler provided with a stator frame that is relatively rotatably or rotatably mounted, between the rotor frame and the stator frame, an annular dark chamber centered on the shaft center is formed, An annular light emitting portion centering on the rotor shaft that blinks in response to a signal is provided in the one rotor frame or stator frame portion in the dark room, and the annular light emitting portion is provided in the other stator frame or rotor frame portion. An annular light receiving portion for receiving blinking light of the annular light emitting portion is provided at a position facing the A. Data can be transmitted and received by light between the annular light emitting portion and the annular light receiving portion.

According to a second aspect of the invention, a rotor frame mounted on the rotor shaft, and a stator frame mounted on the rotor frame so as to be rotatable or stopable relative to each other while sharing the shaft center of the rotor shaft. In the rotating photocoupler including, between the rotor frame and the stator frame, an annular dark chamber centered on the axial center is formed, and in the one dark rotor chamber or stator frame portion. Is provided with an annular light emitting portion centered on the rotor shaft that blinks according to a signal, and the other stator frame or rotor frame portion receives the blinking light of the annular light emitting portion at a position facing the annular light emitting portion. A point light receiving portion is provided. Data can be transmitted and received by light between the annular light emitting unit and the point light receiving unit.

According to another aspect of the invention, there is provided a rotor frame mounted on the rotor shaft, and a stator frame mounted on the rotor frame so as to be rotatable or stopable relative to each other while sharing the shaft center of the rotor shaft. In the rotating photocoupler including, between the rotor frame and the stator frame, an annular dark chamber centered on the axial center is formed, and in the one dark rotor chamber or stator frame portion. Is provided with a point emission part that blinks in response to a signal, and the other stator frame or rotor frame part is centered on the rotor shaft that receives the blinking of the point emission part at a position facing the point emission part. An annular light receiving portion is provided. Data can be transmitted and received by light between the point light emitting unit and the annular light receiving unit.

According to a fourth aspect of the present invention, in the annular light emitting portion, one end surface of the plurality of linear light guides is annularly arranged in the dark chamber around the axis of the rotor shaft. And the other end faces of the plurality of linear light guides are combined into one, and a light emitting element that blinks according to a signal is arranged in the combined part. is there. The annular light emitting portion can be configured by a linear light guide such as an optical fiber.

According to a fifth aspect of the present invention, in the annular light receiving portion, one end face of a plurality of linear light guides is annularly arranged in the dark chamber around an axis of the rotor shaft. The other end surfaces of the plurality of linear light guides are combined into one, and the light receiving element is arranged in the combined portion. The annular light receiving portion can be configured by a linear light guide such as an optical fiber.

According to a sixth aspect of the present invention, the point light receiving portion is a light receiving element facing the dark room. The point light receiving portion can be configured by one light receiving element.

According to a seventh aspect of the invention, the point light emitting portion is a light emitting element facing the dark room. A single light emitting element can form a point light emitting unit.

According to an eighth aspect of the invention, a plurality of rotating photocouplers according to the first, second or third aspects are attached to the rotor shaft in plural sets. By installing multiple sets on the rotor shaft, data can be sent and received bidirectionally over multiple lines.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to an embodiment shown in the drawings. 3 and 4 are diagrams for explaining the rotating photocoupler of the present invention, FIG. 3 is a diagram for explaining the principle of the rotating photocoupler of the present invention, and FIG. 4 is of another rotating photocoupler of the present invention. It is a figure explaining a principle.

First, as shown in FIG. 3, a photocoupler 10 for rotation responds to a signal by a rotor frame or a stator frame which rotates or stops relative to one shaft center 1 such as a rotor shaft. Ring light emitting part 1
1 is arranged, and an annular light receiving portion 12 for receiving blinking light of the annular light emitting portion 11 is arranged on the other stator frame or rotor frame so as to face the annular light emitting portion 11, and similarly, the other starter frame is also provided. Alternatively, another ring-shaped light emitting portion 13 that blinks in response to a signal is arranged on the rotor frame, and the ring-shaped light emitting portion 13 is arranged on the other rotor frame or the stator frame so as to face the ring-shaped light emitting portion 13.
The annular light receiving portion 14 for receiving the blinking of is arranged.

The ring-shaped light emitting portion 11 is composed of, for example, a linear light guide such as a large number of optical fibers, and one end face 11a thereof.
Are arranged side by side in a ring shape at a position having a predetermined first diameter with the axis 1 of the rotor shaft as the center, and the other end surface 11
b are grouped together, and a light emitting element 15 such as a light emitting diode that blinks in response to a signal is arranged at a position facing the end surface 11b, and the blinking of the light emitting element 15 passes through the linear light guide body and the end surface 11a. To be transmitted to. The annular light receiving portion 12 is composed of a large number of similar linear light guides,
One of the end faces 12a is arranged side by side in a ring shape so as to face the end face 11a at a position having a first diameter centered on the shaft center 1, and the other end face 12b is gathered at a position facing the end face 12b. A light receiving element 16 such as a phototransistor is arranged, and the blinking received by the end face 12a is transmitted to the end face 12b through the linear light guide so that the light receiving element 16 detects the blinking. . That is, a signal is transmitted from the light emitting element 15 of the annular light emitting body 11 to the light receiving element 16 of the annular light receiving body 12. The ring-shaped light-emitting body 13 is also composed of a linear light-guide body, and one end surface 13a thereof is arranged in a ring shape at a position having a predetermined second diameter with the shaft center 1 of the rotor shaft as a center, and the other end surface 13a. End surfaces 13b of the light emitting element 17 are arranged, and a light emitting element 17 such as a light emitting diode that blinks in response to a signal is arranged at a position facing the end surface 13b.
Blinking is transmitted to the end face 13a through the linear light guide. The annular light receiving portion 14 is composed of a large number of similar linear light guides, and one end surface 14a thereof is annularly arranged so as to face the end surface 14a at a position having a second diameter centered on the axis 1. The other end surface 14b is arranged, and the light receiving element 18 such as a phototransistor is arranged at a position facing the other end surface 14b, and the blinking received by the end surface 14a passes through the linear light guide body and ends. 14
The light-receiving element 18 detects the blinking. That is, a signal is transmitted from the light emitting element 17 of the annular light emitting body 13 to the light receiving element 18 of the annular light receiving body 14.

Further, as shown in FIG. 4, another rotating photocoupler 20 outputs a signal to one rotor frame or a stator frame which rotates or stops relative to one shaft center 1 such as a rotor shaft. A ring-shaped light emitting portion 11 is arranged to flash according to the above, and a point light receiving portion for receiving the blinking light of the ring-shaped light emitting portion 11 on the other stator frame or rotor frame so as to face the ring-shaped end surface 11a of the ring light emitting portion 11. The light receiving element 16 constituting the above is directly arranged, and similarly, the annular light emitting portion 13 which blinks in response to a signal is arranged in the other starter frame or rotor frame.
The light receiving element 1 which constitutes a point light receiving portion for receiving blinking of the annular light emitting portion 13 on the other rotor frame or stator frame so as to face the end surface 13a of the annular light emitting portion 13.
8 is directly arranged. That is, a signal is transmitted from the light emitting element 15 of the annular light emitting body 11 to the light receiving element 16, and a signal is transmitted from the light emitting element 17 of the annular light emitting body 13 to the light receiving element 18.

In addition to the combination of the ring-shaped light emitters 11 and 13 and the ring-shaped light receivers 12 and 14, and the combination of the ring-shaped light emitters 11 and 13 and the light-receiving elements 16 and 18 which form the point light-emitting part, a point light-emitting portion is provided. A combination of the light-emitting bodies 15 and 17 and the ring-shaped light-receiving bodies 12 and 14 may be combined.

Next, an embodiment based on the above-described principle will be specifically described. 1 and 2 are views for explaining a rotation photocoupler according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view of the rotation photocoupler, and FIG. 2 is an enlargement of a dark room portion of the rotation photocoupler of FIG. FIG.

In these figures, the rotating photocoupler 30 according to the first embodiment of the present invention is shown as a rotor frame 35.
A stator frame 36, a light emitting element 40, a light receiving element 41, a linear light guide member 38 such as a plurality of optical fibers,
It is composed of 39 etc. Rotor frame 35
Is formed in a substantially ring shape with a predetermined thickness attached to the rotor shaft 31. The stator frame 36 is
The flange portion 34a of the cover 34 is formed in a substantially ring shape having a flange portion 36a on the outer peripheral portion, is attached to the periphery of the rotor frame 35 with the same thickness, and is attached to the bearing 33 provided on the rotor shaft 31. It is attached with the flange portion 36a abutting on. An annular dark chamber 37 centered on the shaft center 32 of the rotor shaft 31 is formed between the outer peripheral portion of the rotor frame 35 and the inner peripheral portion of the rotor frame 35. One end surface 38a of each of the plurality of linear light guides 38 is arranged side by side in the dark chamber 37 in an annular shape centered on the axis 32, and the other end surface 38b is integrated into one end surface 3
The light emitting element 40 such as a light emitting diode is provided at a position facing the 8b.
Are arranged. In addition, the plurality of linear light guides 39,
One end surface 39a thereof is arranged side by side in an annular shape at a position facing the end surface 38a in the dark chamber 37, and is drawn out through a hole 34b formed in the flange portion 34a of the cover 34,
The other end surface 39b is combined into one, and the end surface 39b
The light receiving element 41 such as a phototransistor is provided at a position facing the
Are arranged. The light emitting element 40 is connected to a rotation side sequencer via a rotation side signal conversion circuit (not shown), and the light receiving element 41 is connected to a fixed side sequencer via a fixed side signal conversion circuit.

In the rotating photocoupler 30 having the above structure,
The signal transmitted from the rotating sequencer side (not shown) is
The light emitting element 40 provided on the rotor frame 35 side is converted into blinking, and the blinking is the end surface 38b of the linear light guide 38.
From the end surface 38a in the dark room 37,
The blinking light emitted from a is the end surface 39 of the linear light guide 39.
The blinking light transmitted from a to the end face 39b and emitted from the end face 39b is detected by the light receiving element 41 and transmitted to the fixed sequencer side not shown. Therefore, it is possible to transmit data by one line of light in one direction from the rotating side to the fixed side.

FIG. 5 is an enlarged sectional view of a dark room portion of the rotating photocoupler according to the second embodiment of the present invention. The parts and members corresponding to those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The rotating photocoupler 5 of the second embodiment.
In the case of 0, the end faces 38a of the plurality of linear light guides 38 are disposed in the dark chamber 37 formed between the rotor frame 35 and the stator frame 36, which are formed similarly to the first embodiment, and the rotor frame 35 has the end faces 38a. One light receiving element 41 which is arranged side by side in an annular shape and constitutes a point light receiving portion is attached to the starter frame 34 so as to directly face a position facing the end face 38a in the dark room 37. Other configurations are similar to those of the first embodiment.

In the rotating photocoupler 50 having the above structure,
The signal transmitted from the rotation side sequencer side is converted into blinking light of the light emitting element 40 provided on the rotor frame 35 side, and the blinking is transmitted from the end surface 38b of the linear light guide 38 to the end surface 38a in the dark room 37. The blinking light emitted from the end surface 38a is directly detected by the light receiving element 41 and transmitted to the fixed sequencer side (not shown). Therefore, it is possible to transmit data by one line of light in one direction from the rotating side to the fixed side.

In each of the first and second embodiments described above, the transmission of data by the light of one line in one direction from the rotating side to the fixed side has been described as an example, but a rotating photocoupler having the same structure is used as the rotor. -By installing multiple sets on the shaft 31, it is possible to send data on multiple lines, and it is also possible to send data from the fixed side to the rotating side with the same structure. By combining them, bidirectional data transmission / reception is possible on multiple lines. Become.

[0025]

As described above, the rotating photocoupler of the present invention is mounted on the rotor frame and the rotor frame so that the rotor frame can be relatively rotated or stopped relative to the rotor frame by sharing the axis of the rotor shaft. In a rotation photocoupler with a stator frame that is
An annular dark chamber centered on the axis is formed between the rotor frame and the stator frame, and one of the rotor frame or stator frame portion of the dark chamber has an annular light emitting portion or a blinking light which blinks in response to a signal. The point light emitting part is provided, and the other light receiving part or point light emitting / receiving part is provided at the position facing the ring light emitting part or the point light emitting part in the stator frame or rotor frame part, so that light emission in the annular dark chamber is achieved. The unit and the light receiving unit enable transmission and reception by light between the rotating side and the fixed side in a plurality of lines and in both directions.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rotating photocoupler according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a dark room portion of the rotating photocoupler of FIG.

FIG. 3 is a diagram illustrating the principle of the rotating photocoupler of the present invention.

FIG. 4 is a diagram illustrating the principle of another rotating photocoupler of the present invention.

FIG. 5 is an enlarged cross-sectional view of a dark room portion of the rotating photocoupler according to the second embodiment of the present invention.

FIG. 6 is a diagram illustrating a conventional rotating photocoupler.

FIG. 7 is a diagram illustrating another conventional rotating photocoupler.

[Explanation of symbols]

10, 20, 30, 50 rotation photocoupler 11,13 Ring light emitter 11a, 11b, 13a, 13b End surface 12,14 Ring photoreceptor 12a, 12b, 14a, 14b End face 15,17 Light emitting element 16,18 Light receiving element 31 rotor shaft 32 axis 33 bearings 34 cover 34a Flange part 34b hole 35 rotor frame 36 Stater Frame 36a Flange part 37 Darkroom 38,39 Linear light guide 38a, 38b, 39a, 39b End surface 40 light emitting element 41 Light receiving element

Claims (8)

[Claims] 1. A rotating photocoupler comprising: a rotor frame attached to a rotor shaft; and a stator frame attached to the rotor frame so as to be rotatable or stopable relative to each other while sharing the axis of the rotor shaft. Between the rotor frame and the stator frame,
An annular dark chamber centered on the axis is formed, and the one rotor frame or stator frame portion in the dark chamber is provided with an annular light emitting portion centered on the rotor shaft that blinks in response to a signal, The rotating photocoupler, wherein the other stator frame or rotor frame portion is provided with an annular light receiving portion for receiving blinking of the annular light emitting portion at a position facing the annular light emitting portion. 2. A rotating photocoupler comprising: a rotor frame attached to a rotor shaft; and a stator frame attached to the rotor frame so as to be rotatable or stopable relative to each other while sharing the axis of the rotor shaft. Between the rotor frame and the stator frame,
An annular dark chamber centered on the axis is formed, and the one rotor frame or stator frame portion in the dark chamber is provided with an annular light emitting portion centered on the rotor shaft that blinks in response to a signal, The rotating photocoupler, wherein the other stator frame or rotor frame portion is provided with a point light receiving portion for receiving blinking of the annular light emitting portion at a position facing the annular light emitting portion. 3. A rotating photocoupler comprising: a rotor frame attached to a rotor shaft; and a stator frame attached to the rotor frame so as to be rotatable or stopable relative to each other while sharing an axis of the rotor shaft. Between the rotor frame and the stator frame,
An annular dark chamber centered on the axis is formed, and one of the rotor frames or the stator frame portion in the dark chamber is provided with a point light-emitting portion that blinks in response to a signal, and the other stator frame or rotor frame. A rotating photocoupler, characterized in that an annular light receiving portion centering on the rotor axis for receiving blinking light of the point emitting portion is provided at a position facing the point emitting portion. 4. The annular light emitting portion is arranged in the dark chamber such that one end face of a plurality of linear light guides is annularly arranged about an axis of the rotor shaft. 3. The rotating photocoupler according to claim 1, wherein the other end surface of the light guide member is integrated into one, and a light emitting element which blinks in response to a signal is arranged in the combined portion. . 5. The annular light receiving portion is arranged such that one end surface of a plurality of linear light guides is annularly arranged around the axis of the rotor axis in the dark chamber, and the plurality of linear light guides are arranged along the annular shape. 4. The rotating photocoupler according to claim 1, wherein the other end surface of the light guide member is integrated into one, and the light receiving element is arranged in the combined portion. 6. The rotating photocoupler according to claim 2, wherein the point light receiving section is a light receiving element facing the dark room. 7. The rotating photocoupler according to claim 3, wherein the point light emitting portion is a light emitting element facing the dark room. 8. A rotating photocoupler having a plurality of rotating photocouplers according to claim 1, 2 or 3 attached to said rotor shaft.