JPS6196642A - Optical signal transmission apparatus - Google Patents

Abstract

PURPOSE:To reduce restriction on mounting in an apparatus and eliminate unstable element by providing electrode or similar means so that potential can be applied externally to the desired point of optical fiber. CONSTITUTION:A ring-shaped potential connecting electrode or similar means 6 is provided on an optical fiber 4 for externally determining potential so that distribution of surface potential of optical fiber can be determined externally. Thereby, the condition similar to the potential distribution within an apparatus can be generated and discharge phenomenon between structure 5 of apparatus and optical fiber 4 can be eliminated. The connection between connection electrode or similar means 6 and the optical fiber 4 can be made more reliable by inserting flexible and conductive rubber-like material 7 between them or by winding a metal foil to the optical fiber 4 and then connecting it to the electrode 6.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] When it is desired to exchange signals between a part at a high potential and a part at a low potential after high voltage insulation, the signals to be exchanged are made into optical signals and sent via an optical fiber. If you send it, send it efficiently,
The device can also be made compact and easy to implement. It can be used for power control of high potential parts in FE electric power sources, ion source power sources, etc.

[Background of the invention]

The device announced in the literature is a large device that sends control signals for the accelerator ion source through optical fiber.
In an environment where the optical fiber can be mounted and there is sufficient space around it, sufficient insulation distance can be secured, but for FEE subgun power sources, the source itself must be made small, and the insulation distance cannot be secured sufficiently.・It is rarely necessary to implement optical fiber as long as it meets the environmental conditions.

[Purpose of the invention]

In high-voltage power supplies and devices that apply high voltages, when optical fibers are used to exchange signals with high-voltage insulation inside the devices to which high voltages are applied, the high efficiency of optical fibers It is small and lightweight and is not affected by electrical disturbances and can be used even under adverse conditions such as when high voltage is applied by making use of electrical insulation.

[Summary of 2.1 Light] When an optical fiber is mounted in a device to which high voltage is applied, it is difficult to mount it in such a way that there is no potential difference between the potential of each part of the optical fiber and the potential of the device in the vicinity. Therefore, it is sufficient to apply a potential to the surface of the optical fiber from the outside so that the surface potential of the optical fiber matches the potential distribution within the device.

[Embodiments of the invention]

Figure 2 shows an example using optical fibers.

In the figure, 1 is a high voltage generation power supply, 2 is a floating part in a high potential part, 3 is a part in a low potential part, and 4 is a part between a floating part 2 and a low potential part 3 in a high potential part. This is an optical fiber for transmitting optical signals by electrically insulating the fibers. Reference numeral 5 denotes a structure having a certain potential, such as a shielding hoop. 8 is 14 in the device
This is a voltage divider resistor for applying potential to structures 5 and the like.

In general, the material of the optical 7-eyeper is made of a material that has excellent electrical insulation characteristics, and is convenient for use as a signal transmission path for control signals and the like by electrically insulating it under high voltage. When a voltage j is applied to both ends of the optical fiber, a potential distribution proportional to the length as shown in FIG. 3 is exhibited due to the specific resistance and surface insulation resistance of the constituent materials of the optical fiber.

However, the structure 5 in which the inside of the device to which a high voltage is applied is at an arbitrary potential of a harmonizing device incorporating an optical fiber.
The potential state on the optical fiber near that part is not the same, and if the difference in 'tO1 becomes large enough to exceed the withstand voltage at that part, catastrophic breakdown will occur.

To solve this problem, either make sure that the potential distribution inside the device is the same as the potential distribution of the optical fiber, or create a sufficient insulation distance to prevent dielectric breakdown even if a large potential difference occurs. This would be fine, but it is extremely difficult to prevent the potential difference from becoming too large by modifying the mounting surface, and ensuring a sufficient insulation distance requires making the device itself larger. In order to solve the above problems, it is sufficient to make the potential distribution state inside the device and the surface potential distribution of the optical fiber the same. FIG. 1 shows an example of the present invention. In the figure, if a ring-shaped potential connection electrode or something similar 6 is attached to the optical fiber so that the surface potential distribution state of the optical fiber can be determined externally, and the potential is determined externally, a state close to the potential distribution inside the device can be obtained. This makes it possible to avoid the above-mentioned inconveniences and difficulties, and eliminate the discharge phenomenon between the structure 5 of the device and the optical fiber 4. In addition, in order to improve the contact between the grounding electrode or something similar 6 and the optical fiber 4, a rubber-like material 7 having flexibility and conductivity is sandwiched between them, or a metal foil is wrapped around the optical fiber 4 and the electrode 6 is used. It becomes even more reliable by connecting to Moreover, this electrode 6 can also be used as an optical fiber fixing support, which is convenient.

〔Effect of the invention〕

By performing the above-described measures, restrictions on mounting within the device can be reduced and unstable elements can be removed. Since mounting constraints are reduced, there is no need to take up more insulation space than necessary, and the device can be made more compact.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, FIG. 2 shows an example using an optical fiber, and FIG. 3 shows a potential distribution diagram when a bottom pressure is applied to both ends of the optical fiber. 1... High voltage generation power supply, 2... Portion floating in the high potential section, 3... Portion in the low potential section, 4
... Optical fiber, 5... Part of the structure of the device, 6.
...electrodes or similar objects, 7...conductive objects, figures 1, 2, 3

Claims (1)

[Claims] 1. In an optical fiber transmission device used for transmitting optical signals between a high potential part and a low potential part, at least two electrodes or similar means are provided so that a potential can be applied from the outside to any point on the optical fiber. An optical signal transmission device characterized in that it is provided with at least one.