Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
1999-10-08
2002-07-16
Osele, Mark A. (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C052S027000, C052S039000, C052SDIG001
Reexamination Certificate
active
06419772
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method of and a structure for attaching a microwave absorber to the ceiling, a wall, the floor or the like.
DESCRIPTION OF RELATED ART
A simulation on electromagnetism jamming or microwave reflection characteristics has conventionally been conducted with the use of a microwave anechoic chamber or a microwave semi-anechoic chamber. For attaching microwave absorbers to the ceiling, walls, floor and the like of such a chamber, there has been employed an adhesive bonding method of bonding the bottoms of the microwave absorbers to the installation sides of the chamber. According to this method, the microwave absorbers are required to be fixed with the use of jigs or frames until the adhesives are perfectly solidified.
According to this method, however, such fixation takes time and care should be used such that the microwave absorbers are not damaged in the course of fixation. Thus, this method has never been suitable for attachment of microwave absorbers in a stable, rapid and easy manner. Further, replacement of used microwave absorbers with new ones has also been troublesome.
In view of the foregoing, it is an object of the present invention to attach microwave absorbers in a much more stable, rapid and easier manner as compared with the prior art.
DISCLOSURE OF THE INVENTION
To achieve the object, the present invention provides a microwave absorber attaching method comprising: bonding a plurality of ferrite plates to a shield plate at an installation place such as the ceiling, a wall, the floor or the like; connecting the base portion of a support rod to the ferrite plates, causing the support rod to project therefrom; placing a microwave absorber with its base portion placed along the ferrite plates; passing the support rod through a tip opening of the microwave absorber, causing the support rod to project through the tip opening; passing the support rod through a covering tray to cover the microwave absorber; and fastening a fastening member to a tip threaded portion of the support rod, whereby the microwave absorber is attached to the installation place.
According to the attaching method of above, with the use of the support rod connected to the ferrite plates at the installation place, a microwave absorber can readily, quickly and stably be attached as placed along the ferrite plates.
The present invention also provides a microwave absorber attaching method comprising: bonding a plurality of ferrite plates to a shield plate at an installation place such as the ceiling, a wall, the floor or the like; connecting the base portion lateral side of the microwave absorber positioned at each end of the installation place, to the ferrite plates with the use of fixing jigs; and coupling adjacent microwave absorbers, to each other, with the use of ferrite-plate fixing jigs for fixing thereof to the ferrite plates and with the use of positioning jigs to be inserted between jig members of the ferrite-plate fixing jigs, whereby the microwave absorbers are attached to the installation place.
According to the attaching method of immediately above, with the use of the base lateral sides of microwave absorbers instead of the support rod, a number of microwave absorbers can successively be attached with no spaces wasted. This enables the microwave absorbers to be very readily, quickly and stably attached.
Further, according to another attaching method jointly using the methods above-discussed, microwave absorbers can be attached in a further stable manner.
As further set forth, the present invention provides a microwave absorber attaching method comprising: bonding a plurality of ferrite plates to a shield plate at an installation place such as the ceiling, a wall, the floor or the like; attaching, to the ferrite plates, supports through which a hanging shaft passes; and engaging, with the hanging shaft, engagement portions of a microwave absorber at the base portion thereof, whereby the microwave absorber is attached as placed along the ferrite plates.
According to the attaching method of immediately above, no other member is required to be attached to the tip of the microwave absorber. This not only stabilizes the performance of the microwave absorber, but also simplifies the attachment thereof.
As also set forth, the present invention provides a microwave absorber attaching method wherein: a plurality of ferrite plates are bonded directly to a shield plate; or a plurality of ferrite plates are previously bonded to a panel, through which the plurality of ferrite plates are then bonded to a shield plate.
Bonding the ferrite plates directly to the shield plate, is suitable to field execution. On the other hand, previously bonding the ferrite plates to the panel is advantageous in view of previous preparation at the factory, thus facilitating the delivery of the ferrite-bonded panel to the execution field.
The present invention may be arranged such that the gaps between adjacent ferrite plates are sealed with a magnetic sealing agent. The present invention may be arranged such that the gaps between adjacent ferrite plates and the gaps between adjacent ferrite-bonded panels are sealed with a magnetic sealing agent.
According to the invention, the following problems can be solved.
For sticking tile-like ferrite plates to the base plate without any gaps between adjacent ferrite plates in order to dispose microwave absorbers for forming a microwave anechoic chamber or the like, the workers are required to have excessive concentration. This lengthens the term of works with an increase in execution cost. In fact, most of the ferrite plates are not smooth and flat at the peripheral contours thereof. It is therefore often required to polish the ferrite plates, causing the same to be smoothed and flattened at the peripheral contours thereof. This results in excessive increase in execution cost for sticking the ferrite plates. Even though the ferrite plates are stuck without any gaps between adjacent ferrite plates, there are inevitably produced gaps between adjacent ferrite plates, with the passage of time after the execution, due to distortion of the base plate or the structure including the base plate, or due to external force such as that caused by an earthquake or the like.
In view of the foregoing, it has been proposed to overcome such a gap problem by putting linings, or by producing, with high precision, ferrite plates with the use of molds. According to the method using linings, a number of linings are required. This not only increases the cost, but also requires much labor for disposing such linings. The method using molds is also disadvantageous in view of much labor for sintering and machining the ferrite plates.
The problems above-mentioned can be solved by the use of the magnetic sealing agent to fill the gaps.
The present invention may be arranged such that the magnetic sealing agent comprises magnetic powder and a binder, and is arranged to penetrate the gaps under a capillary action and to be hardened later.
Here, the gaps refer to the gaps between adjacent ferrite plates and to the gaps between adjacent ferrite-bonded panels, but are not limited thereto.
According to this simple and economical method of applying the magnetic sealing agent to the gaps, the magnetic sealing agent penetrates the gaps and is then hardened to fill the gaps, thus preventing the microwave absorbing capacity from being lowered due to gaps. Further, this involves less likelihood that after application, the magnetic sealing agent is greatly contracted to produce gaps again.
We set forth specific embodiments of the magnetic sealing agent.
As an attaching structure for embodying the microwave absorber attaching method, the present invention provides a microwave absorber attaching structure for attaching a microwave absorber to a shield plate of an installation place such as the ceiling, a wall, the floor or the like, this structure comprising:
(1) a plurality of ferrite plates bonded to a shield plate;
(2) a support rod to be connected at the base portion t
Hamauzu Takashi
Hara Hazime
Mori Kazuhiko
Nagata Hiroshi
Suzue Masayoshi
Osele Mark A.
Otsuka Chemical Co. Ltd.
Smith , Gambrell & Russell, LLP
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