JP3589909B2 - Optical element insulation structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an insulating structure of an optical element, and more particularly to an insulating structure of an optical element charged to a high voltage and connected to a potential in insulating oil.
[0002]
[Prior art]
In a power supply for an X-ray tube or a power supply for an electron tube such as a laser tube, since the device is charged to a high voltage, the device is often housed in a tank filled with insulating oil. It may be necessary to transmit control signals directly from outside the tank to the high voltage charged circuits in the tank. In this case, high voltage insulation may be used while transmitting control signals using optical elements.However, arranging optical elements in insulating oil has the negative effect of insulating oil on optical elements. Yes, the problem remains.
[0003]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure for protecting an optical element, which is housed in a tank filled with insulating oil and charged with a high voltage, from the influence of the insulating oil.
[0004]
[Means for Solving the Problems]
In order to solve this problem, the present invention proposes the following means. That is,
The insulation structure of the optical element,
A material suitable for the required high-voltage insulation and an optical cable of sufficient length;
An optical element optically coupled to the optical cable;
A printed circuit board having the optical element mounted on one surface;
A synthetic resin case, a bottom plate portion, a levee wall portion disposed on the bottom plate portion and having a shape surrounding a rectangle, a step edge portion provided halfway inside the height of the levee wall portion, and a step. A synthetic resin case comprising a partition provided at a height equal to the height of the edge and forming a first chamber and a second chamber;
The printed circuit board is disposed on the stepped edge in the closed space formed in the first chamber to house the optical element, and the optical cable is closely penetrated from the partition to the second chamber. A closed space;
The optical cable extending from the closed space to the second chamber is closely penetrated from the levee wall, and the second chamber is connected to the upper part of the stepped edge and molded with a solid insulator layer formed of a thermosetting resin. An insulating structure for an optical device, comprising:
[0005]
It is also proposed that a partition be provided in the second chamber to allow the optical cable to pass therethrough.
[0006]
It is also proposed that a rubber bushing be interposed between the partition and the bank wall through which the optical cable passes.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a top view and a side view of an embodiment of an optical element insulating structure according to the present invention, and FIG. 2 is a circuit diagram of an electron tube power supply device to which the optical element insulating structure according to the present invention is applied. is there.
[0008]
In FIG. 2, in the power supply device for an electron tube 50, circuit components are accommodated in a tank 57 filled with insulating oil 58. One output terminal of the high voltage power supply 55 is grounded via the ground terminal 59, and the other output terminal is connected to the high voltage terminal 61 and to one end of the electronic circuit 53. The other end of the electronic circuit 53 is connected to the output terminal 63. The optical receiving module 5 and the optical transmitting module 51 are connected to the electronic circuit 53, a control signal is obtained from the optical receiving module 5, and a signal for detecting the operation state of the electronic circuit 53 is transmitted to the optical transmitting module 51. give. Therefore, the electronic circuit 53, the optical receiving module 5, and the optical transmitting module 51 connected to the high voltage terminal 61 are charged to a value equal to or corresponding to the value of the output voltage of the high voltage power supply 55. . For example, if the voltage is set to 50 kV, a high voltage having a value substantially equal to that value is charged to the electronic circuit 53, the optical receiving module 5, and the optical transmitting module 51. An optical cable 17 is connected to the input side of the optical receiving module 5, and the optical cable 17 is extended to an appropriate length and led out of the tank 57. The length of the optical cable 17 extending to the outer wall of the tank 57 contributes to high-voltage insulation. Similarly, an optical cable 65 is connected to the output side of the optical transmission module 51, and the optical cable 65 is extended to an appropriate length and led out of the tank 57. The length of the optical cable 65 extended to the outer wall of the tank 57 acts on high-voltage insulation.
[0009]
FIG. 1 is a top view (a) and a side sectional view (b) of an embodiment of an insulating structure for an optical element according to the present invention, and shows an insulating structure 1 with a built-in light receiving module including a light receiving module 5. FIG. 1A shows a state before the thermosetting resin is molded, and FIG. 1B shows a state after the thermosetting resin is injected. In the figure, a synthetic resin case 3 has a bottom plate portion 31, mounting holes 32 formed at four corners of the bottom plate portion 31, a bank wall portion 33, and a height slightly lower than the height inside the bank wall portion 33. A step edge 34 is provided. At the height of the step edge portion 34, partition portions 35 and 36 are provided further inside, and the first chamber 37, which is surrounded by the synthetic resin and is open only at the upper portion, and the second chamber 37, which is slightly narrower, are opened. A chamber 38 and a third chamber 39 are formed. The first chamber 37, the second chamber 38, and the third chamber 39 are separated from each other at the height of the step edge portion 34, and are common between the height of the step edge portion 34 and the height of the bank wall 33. It becomes space. The printed circuit board 7 is mounted on the step edge 34 of the first chamber with the screw 9. The light receiving module 5 is mounted on the surface of the printed circuit board 7 on the first chamber side. The light receiving module 5 is housed in a first chamber closed by each surface of the printed circuit board 7, the bottom plate 31, the bank wall 33, and the partition 35. The connection line of the light receiving module 5 to the printed circuit board 7 is connected to the connector 21 attached to the right wall portion 33b of the bank wall portion 33 via the conductor pattern and the lead wire 22 on the upper surface of the drawing.
[0010]
The optical cable 17 on the input side of the optical receiving module 5 is provided at the upper edge of the partition 36 from the first chamber 37 through the rubber bushing 11 provided at the upper edge of the partition 35, through the second chamber 38. Through the rubber bushing 13, the third chamber 39, the rubber bushing 15 provided on the left wall portion 33 a of the bank wall portion 33, and extends to the outside of the light receiving module built-in insulating structure 1.
[0011]
From the upper part of the space surrounded by the bank wall 33, the thermosetting resin 19 is filled and molded, and only the first chamber 37 including the light receiving module 5 is closed to form an air layer. The resin 19 forms the solid insulator layer 40. When the thermosetting resin 19 is cured in the mold, the thermosetting resin 19 is in close contact with the contacting surface and shrinks to apply pressure. Therefore, even when the light receiving module built-in insulating structure 1 is buried in insulating oil, the first chamber 37 including the light receiving module 5 forms the closed space 30 to prevent the insulating oil from penetrating. it can.
[0012]
The material of the synthetic resin case 3 needs to have a property of withstanding insulating oil and a property of being compatible with the thermosetting resin 19 to be molded. For example, an epoxy resin or a polycarbonate resin is preferable. The thermosetting resin 19 needs to have a property of withstanding insulating oil and a property of being compatible with the synthetic resin case 3, and an epoxy resin is a preferable example.
[0013]
For the optical cables 17 and 65, it is necessary to select a material having good electrical insulation. Further, it is necessary that these lengths are long enough to withstand a predetermined high voltage value in the insulating oil. Many off-the-shelf optical cables have adequate electrical insulation properties and are relatively easy to select.
[0014]
In the present invention, the rubber bushings 11, 13, and 15 are not necessarily required components, but are not necessarily required as long as the adhesiveness between the partitions 35 and 36 and the optical cable 17 can be maintained. Further, the partition 35 is indispensable to make the first chamber 37 a closed space, but the partition 36 is not necessarily required. That is, the partition portion 36 is for holding the optical cable 17 in the solid insulating layer, and the number of the partitions can be arbitrarily selected from zero to a plurality as necessary. Further, the step edge portions 34 corresponding to the positions of the second chamber 38 and the third chamber 39 are not necessarily required.
[0015]
Although the embodiments of the optical receiving module have been described above, the present invention can be similarly applied to the optical transmitting module.
[0016]
Although the case where the insulating oil is used has been described above, the insulating structure of the optical element according to the present invention can be applied to the case of gas insulation such as air or insulating gas.
[0017]
【The invention's effect】
As described above, according to the present invention, a pressure is applied between the thermosetting resin and the optical cable due to the shrinkage characteristic of the thermosetting resin during curing, so that the insulating oil can be prevented from penetrating into the first chamber having the optical element, Protects against the effects of insulating oil.
[Brief description of the drawings]
FIG. 1 is a top view and a partial cross-sectional view of an embodiment of an insulating structure of an optical element according to the present invention.
FIG. 2 is a circuit diagram of a power supply device for an electron tube to which the insulating structure of an optical element according to the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Insulating structure with built-in light receiving module 3 ... Synthetic resin case 5 ... Light receiving module 7 ... Printed circuit board 9 ... Screw 11, 13, 15 ... Rubber bushing 17 ... Optical cable 19 ... Thermosetting resin 21 ... Connector 30 ... Sealed space DESCRIPTION OF SYMBOLS 31 ... Bottom plate part 32 ... Mounting hole 33 ... Empartment wall part 34 ... Step edge part 35, 36 ... Partition part 37 ... First chamber 38 ... Second chamber 39 ... Third chamber 40 ... Solid insulator layer 50 ... Electron tube power supply Device 51 Optical transmission module 53 Electronic circuit 55 High voltage power supply 57 Tank 59 Ground terminal 61 High voltage terminal 63 Output terminal 65 Optical cable

Claims (3)

The insulation structure of the optical element,
A material suitable for the required high-voltage insulation and an optical cable of sufficient length;
An optical element optically coupled to the optical cable;
A printed circuit board having the optical element mounted on one surface;
A synthetic resin case, a bottom plate portion, a levee wall portion disposed on the bottom plate portion and having a shape surrounding a rectangle, a step edge portion provided halfway inside the height of the levee wall portion, and a step. A synthetic resin case comprising a partition provided at a height equal to the height of the edge and forming a first chamber and a second chamber;
The printed circuit board is disposed on the stepped edge in the closed space formed in the first chamber to house the optical element, and the optical cable is closely penetrated from the partition to the second chamber. A closed space;
The optical cable extending from the closed space to the second chamber is closely penetrated from the levee wall, and the second chamber is connected to the upper part of the stepped edge and molded with a solid insulator layer formed of a thermosetting resin. An insulating structure for an optical element, comprising: The insulating structure for an optical element according to claim 1, wherein a partition portion is provided in the second chamber so that the optical cable penetrates through the partition. The insulating structure for an optical element according to claim 1 or 2, wherein a rubber bushing is interposed between a partition portion and a bank wall portion through which the optical cable penetrates.

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