JPH0316050B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal transmission device that performs multi-channel signal transmission between a rotating body and a stationary body by optical communication.

[Prior Art] The present inventors previously proposed a signal transmission device between a rotating body and a stationary body in Japanese Patent Application No. 57-138146. In this previously proposed signal transmission device, electrical signals generated from multiple signal sources on a rotating body are transmitted as optical signals from around the rotating body to the stationary body, thereby transmitting signals by time sharing. Because it enables
Although the signal transmission device can be compactly housed between the end of the rotating shaft and the bearing that supports it, there is a problem in that it requires a highly accurate synchronization signal.

For example, Japanese Patent Application Laid-Open No. 164994/1983 discloses that in an optical path between the outer peripheral surface of a rotating shaft and the inner peripheral surface of a stationary member, a light beam from a light emitting element provided on one side is received by a light receiving element on the other side. An apparatus for doing so is disclosed. However, in this device, in order to transmit a large number of signals, it is necessary to install similar devices in the axial direction for the number of signals, which increases the size of the device as a whole. We use methods such as irradiation. Therefore, as with the previously proposed devices, there is a problem in that the control system becomes complicated.

[Problems to be Solved by the Invention] The present invention is capable of constantly transmitting signals regardless of the rotational position of the rotating body, and has a simple and compact configuration, and can simultaneously transmit data from multiple channels on the rotating body while stationary. The purpose is to provide a signal transmission device that can transmit signals to the body side.

[Means for Solving the Problems] A signal transmission device of the present invention to achieve the above object includes a plurality of light emitting elements that use signals generated from a plurality of signal sources on a rotating body as optical signals, on the rotating body. They are attached to the periphery in parallel in the axial direction, and a transparent plate consisting of annular flat plates with a circumferential surface as a light reflecting surface is laminated and arranged around the light emitting element attachment position, and the outer circumference of this transparent plate is It is characterized in that a light-receiving element is provided in the removed portion of the light-reflecting surface.

[Function] According to the above signal transmission device, a signal generated in a signal source on a rotating body is projected as an optical signal from a light emitting element into a transparent plate consisting of an annular flat plate disposed around the light emitting element, and the signal is transmitted as a transparent plate. While being reflected multiple times within the plate, the light enters the light receiving element and is converted into an electrical signal. Therefore, signals can always be transmitted regardless of the rotational position of the rotating body, and the signal transmission system consisting of the light emitting element, transparent plate, and light receiving element is arranged in multiple layers in a simple and compact manner. The configuration allows multi-channel data on the rotating body to be simultaneously transmitted to the stationary body side.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment of the signal transmission device according to the present invention, in which a large number of signal sources 2,
2, . . . are provided, and these signal sources are respectively connected to a large number of light emitting elements 3 including light emitting diodes and the like attached in parallel in the axial direction around the rotating body 1. The light emitting element 3 is a signal source 2
The signal generated from the light emitting element is projected as an optical signal into the transparent plate 4, which is an annular flat plate stacked and arranged around the light emitting element attachment position, from the inner circumference side thereof.

The transparent plate 4 arranged in the stationary system is made of a material with good light transmittance, such as acrylic resin or glass, and has a light reflecting surface 5 formed on its outer peripheral surface by plating or bonding a reflective material. A removed portion 6 of the light reflecting surface 5 is provided in a part of the outer periphery of the transparent plate 4, and a light receiving element 7 such as a phototransistor is placed opposite thereto. Therefore, regardless of the position of the light emitting element 3, the optical signal from the light emitting element 3 is projected into the transparent plate 4 and is reflected multiple times on the light reflecting surface 5 on the outer periphery of the transparent plate 4, during which time the light signal is not received. The light enters the element 7 and is converted into an electrical signal, which is sent to the recorder 9 etc. through the amplifier 8.

In this case, especially on the pair of parallel surfaces of the thin transparent plate 4, most of the light is totally reflected without any consideration such as providing a reflective surface, so no light is transmitted there. Furthermore, even if the transparent plate 4 is made thinner, efficient signal transmission is achieved through total reflection, and the laminated structure of the transparent plates can be made more compact.

As can be seen from FIG. 2, the signal transmission system consisting of the light emitting element 3, the transparent plate 4, the light emitting element 7, etc. is constructed by arranging a large number of them in parallel in the axial direction of the rotating body 1. This allows multi-channel data to be transmitted to the stationary system simultaneously. In the figure, 10 is a shielding plate interposed between each transparent plate 4, and the surface thereof can be used as a light reflecting surface if necessary.

Signal sources 2, 2, ... on the rotating body 1
can be, for example, a sensor for detecting tool damage attached to a plurality of tools on a rotating shaft in a face milling machine, etc., and the signal from such a signal source 2 is converted into a voltage value by a V/F converter. light emitting element 3 as a pulse train signal.
You can also send it to

In addition, a part of the optical signal that is multiplely reflected by the light reflecting surface 5 on the outer periphery of the transparent plate 4 passes through the inner periphery of the transparent plate 4 and reaches the periphery of the rotating body 1. It is desirable that a portion of the rotating body 1 other than the portion where the light emitting element 3 is disposed is also used as a light reflecting surface. Furthermore, when the projected light from the light emitting element 3 is projected as a spot light directed in a substantially constant direction, when the projected light from the light emitting element 3 is projected from the surface of the rotating body 1 in the radial direction, The reflected light on the light reflecting surface 5 on the outer periphery of the transparent plate 4 returns toward the light emitting element 3, so it is effective to tilt the direction of light emitted from the light emitting element 3 to some extent with respect to the radiation direction. be.

[Effects of the Invention] According to the signal transmission device of the present invention described in detail above, multi-channel data from a rotating body can be simultaneously transmitted to a stationary body with a simple and compact configuration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of the same side. 1...Rotating body, 3...Light emitting element, 4...Transparent plate,
5... Light reflecting surface, 7... Light receiving element.

Claims (1)

[Claims] 1 A large number of light emitting elements that use signals generated from a number of signal sources on a rotating body as optical signals are attached in parallel in the axial direction around the rotating body, and a peripheral surface is attached around the position where the light emitting elements are attached. Between a rotating body and a stationary body, characterized in that a transparent plate consisting of an annular flat plate as a light reflecting surface is stacked and arranged, and a light receiving element is provided on the outer periphery of the transparent plate where the light reflecting surface is removed. signal transmission equipment.