JPS60206334A - Signal transmitting device between rotating body and stationary body - Google Patents

Abstract

PURPOSE:To transmit the signal from a rotating body without requiring a synchronizing signal and to transmit it to many channels by providing light emitting devices, which convert signals to optical signals, around the rotating body and arranging an annular light reflecting space around them and providing photodetectors in the outside peripheral part of this space. CONSTITUTION:Signals from signal sources 2, 2... are projected as optical signals from light emitting devices 3 around a rotating body 1 into transparent plates 4 which form the annular light reflecting space arranged around devices 3. Light reflecting faces 5 are formed on outside peripheral faces of transparent plates 4 arranged in the stationary system, and parts 6 where light reflecting faces 5 are eliminated are provided partially, and photodetectors 7 are provided to face these parts. Consequently, said optical signals are made incident on photodetectors 7 and are converted to electric signals independently of positions of devices 3. Many transmission systems are arranged in parallel in the axial line direction of the rotating body 1 to transmit signals to many channels.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for transmitting signals between a rotating body and a stationary body by optical communication.

The present inventors have previously proposed a signal transmission device between a rotating body and a stationary body in Japanese Patent Application No. 57-138148. 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 achieving signal transmission by time sharing. This allows the signal transmission device to be compactly housed between the end of the rotating shaft and the bearing that supports it, but there is a problem in that it requires a highly accurate synchronization signal.

The present invention provides a signal that can always transmit signals regardless of the rotational position of the rotating body without requiring the above synchronization signal, and that can simultaneously transmit multi-channel data from the rotating body to the stationary body. The aim is to provide a transmission device.

The signal transmission device of the present invention for achieving this purpose includes:
A light-emitting element that uses a signal generated from a signal source on the rotating body as an optical signal is attached around the rotating body, and an annular light-reflecting space whose circumferential surface is a light-reflecting surface is formed around the light-emitting element attachment position. A light receiving element is provided on a part of the outer periphery of the light reflecting space.

According to the signal transmission device of the present invention having the above configuration, a signal generated in a signal source on a rotating body is projected as an optical signal from the light emitting element into the annular light reflection space arranged around the light emitting element, and the signal is transmitted as an optical signal. During multiple reflections within the reflection space, 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 by arranging the signal transmission system consisting of the light emitting element, light reflection space and light receiving element in multiple ways,
Multi-channel data on the rotating body can be simultaneously transmitted to the stationary body.

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of a signal transmission device according to the present invention, in which an appropriate number of signal sources 2.2. ... are provided, and each of these signal sources is connected to a light emitting element 3 consisting of a light emitting diode or the like attached around the rotating body l. The light emitting element 3 receives a signal generated from the signal source 2 as an optical signal and is inserted into a transparent plate 4 which forms an annular light reflecting space around the position where the light emitting element is attached, from the inner circumference side thereof. It is something that is projected.

The transparent plate 4 disposed 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 8 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, the optical signal from the light emitting element 3 is transmitted to the light emitting element 3.
Regardless of the position of
is sent to recorder 8 etc. Note that since most of the light is totally reflected on the pair of parallel surfaces of the transparent plate 4, no light is transmitted therethrough.

As shown in FIG. 2, the signal transmission system consisting of the light emitting element 3, the transparent plate 4, the light receiving element 7, etc. can be arranged in large numbers in parallel in the axial direction of the rotating body 1. Multi-channel data in the body can be simultaneously transmitted to the stationary system side. 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 damage to tools 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. It is also possible to convert the frequency into a frequency corresponding to , and send it to the light emitting element 3 as a pulse train signal.

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 circumferential surface of the transparent plate 4 and reaches the circumferential surface of the rotating body 1, and thus the rotating body 1 is rotated. It is desirable that a portion of the 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. .

In addition, although the case where the transparent plate was provided in the light reflection space was explained above, this light reflection space can also be made into the space where the transparent plate does not exist and is surrounded by the light reflection surface.

[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. 1st WA Figure 2

Claims (1)

[Claims] 1. A light-emitting element that uses a signal generated from a signal source on a rotating body as an optical signal is attached around the rotating body, and a ring-shaped light reflecting surface is formed around the position where the light-emitting element is attached, with one circumferential surface being a light-reflecting surface. 1. A signal transmission device between a rotating body and a stationary body, characterized in that a space is provided and a light receiving element is provided in a part of the outer periphery of the light reflecting space.