JP2013106114A - Waveguide band-pass filter - Google Patents
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Abstract
Description
この発明は、ミリ波帯やマイクロ波帯のレーダシステムなどにおいて、所定・所望の周波数帯域の信号を通過させる導波管バンドパスフィルタに関する。 The present invention relates to a waveguide bandpass filter that passes a signal in a predetermined / desired frequency band in a millimeter wave band or a microwave band radar system.
ミリ波帯やマイクロ波帯のレーダシステムなどに用いられるアンテナフィルタとして、矩形導波管バンドパスフィルタが知られている（例えば、特許文献１参照。）。このフィルタは、矩形の空洞である共振部・共振器が連結部を介して複数連結され、各共振部には、共振周波数を調整するためのネジなどの素子が配設され、さらに、各共振部は、ＴＥ１０１モードの共振器となっている。また、各共振部や各連結部は、一般に、アルミニウム合金製の部材・角材などの一面を、フライス加工などの機械加工によってざぐり（凹状に掘り込み）、その一面を板材で覆うことで形成する、という製法が採られている。 A rectangular waveguide bandpass filter is known as an antenna filter used in a millimeter wave band or a microwave band radar system (see, for example, Patent Document 1). In this filter, a plurality of resonators / resonators, which are rectangular cavities, are connected via connecting parts, and elements such as screws for adjusting the resonance frequency are arranged in each resonance part. The section is a TE101 mode resonator. In addition, each resonance part and each connection part are generally formed by scooping (digging into a concave shape) one surface of an aluminum alloy member or square material by machining such as milling and covering the one surface with a plate material. The manufacturing method is adopted.
ところで、レーダシステムなどで使用する周波数、つまり導波管バンドパスフィルタを通過させる周波数が高くなるに従って、共振部の大きさなどを小さくする必要がある。例えば、通過させる周波数が６０ＧＨｚの場合、共振部の長さ（伝搬方向の長さ）が約２．６ｍｍ、共振部の幅（伝搬方向と直交方向の長さ）が約３．８ｍｍ、連結部の長さが約１．２ｍｍとなる。 By the way, as the frequency used in the radar system or the like, that is, the frequency passing through the waveguide bandpass filter becomes higher, it is necessary to reduce the size of the resonance part. For example, when the passing frequency is 60 GHz, the length of the resonance part (length in the propagation direction) is about 2.6 mm, the width of the resonance part (length in the direction orthogonal to the propagation direction) is about 3.8 mm, and the connection part Is about 1.2 mm in length.
しかしながら、このような小さな寸法の共振部や連結部を、機械加工によって精度高く形成・成形することは困難である。さらに、小さな寸法の共振部に対応するには、極めて小さなネジなどを配設する必要があり、共振周波数の調整機構を構築することが困難となる。しかも、今後さらなる高周波数帯域の信号が使用されることが予測され、その場合には、機械加工によって共振部や連結部を形成することや、調整機構を構築することなどが極めて困難となる。 However, it is difficult to form and mold such a small-sized resonance part and connection part with high precision by machining. Furthermore, in order to deal with a resonating portion having a small size, it is necessary to dispose an extremely small screw or the like, and it becomes difficult to construct a resonance frequency adjusting mechanism. In addition, it is predicted that signals in a further higher frequency band will be used in the future. In this case, it is extremely difficult to form a resonance part or a connection part by machining or to construct an adjustment mechanism.
そこでこの発明は、ミリ波帯やマイクロ波帯などの高周波数帯域の信号を通過させる場合であっても、容易に形成・製造することが可能な導波管バンドパスフィルタを提供することを目的としている。 Therefore, an object of the present invention is to provide a waveguide bandpass filter that can be easily formed and manufactured even when a signal in a high frequency band such as a millimeter wave band or a microwave band is allowed to pass. It is said.
上記目的を達成するために請求項１に記載の発明は、略立方体の空洞である共振部が複数連結され、信号が前記複数の共振部を伝播する導波管バンドパスフィルタであって、前記共振部の伝播方向の長さである共振部長さが、ＴＥ１０ｎ（ｎは２以上の整数）モードの共振部長さに基づいて設定され、前記共振部の伝播方向と直交する方向の長さである共振部幅が、ＴＥ１０１モードの共振部幅よりも大きく設定され、前記共振部の伝播方向に沿った側面の少なくとも一方から内側に突出し、高次のモードの信号の伝播を抑制する抑制部が設けられている、ことを特徴とする。 In order to achieve the above object, the invention according to claim 1 is a waveguide bandpass filter in which a plurality of resonating parts each having a substantially cubic cavity are connected, and a signal propagates through the plurality of resonating parts. The resonance part length, which is the length of the resonance part in the propagation direction, is set based on the resonance part length of the TE10n (n is an integer of 2 or more) mode, and is the length in the direction orthogonal to the propagation direction of the resonance part. A resonance part width is set larger than the resonance part width of the TE101 mode, and a suppression part that protrudes inward from at least one of the side surfaces along the propagation direction of the resonance part and suppresses the propagation of the signal of the higher mode is provided. It is characterized by that.
この発明によれば、各共振部の共振部長さが、ＴＥ１０ｎ（ｎは２以上の整数）モードの共振部長さに基づいて設定され、ＴＥ１０１モードにおける共振部の共振部長さよりも長くなっている。また、各共振部の共振部幅が、ＴＥ１０１モードにおける共振部の共振部幅よりも大きく設定され、さらに、各共振部の側面から内側に突出する抑制部が設けられている。 According to this invention, the resonance part length of each resonance part is set based on the resonance part length of the TE10n (n is an integer of 2 or more) mode, and is longer than the resonance part length of the resonance part in the TE101 mode. Further, the resonance part width of each resonance part is set to be larger than the resonance part width of the resonance part in the TE101 mode, and a suppression part protruding inward from the side surface of each resonance part is provided.
請求項１に記載の発明によれば、各共振部の共振部長さと共振部幅とがともに、ＴＥ１０１モードにおける共振部の共振部長さや共振部幅よりも大きく設定されている。このため、ミリ波帯やマイクロ波帯などの高周波数帯域の信号を通過させる場合であっても、容易に形成・製造することが可能となる。 According to the first aspect of the present invention, both the resonance part length and the resonance part width of each resonance part are set larger than the resonance part length and resonance part width of the resonance part in the TE101 mode. For this reason, even when a signal in a high frequency band such as a millimeter wave band or a microwave band is passed, it can be easily formed and manufactured.
一方、共振部の共振部幅を大きくすることで、高次のモードの信号が伝播し悪影響を与えるおそれがあるが、共振部の側面から内側に突出する抑制部が設けられているため、高次のモードの信号の伝播を抑制し、所定・所望の通過特性を得ることが可能となる。 On the other hand, by increasing the resonance part width of the resonance part, a higher-order mode signal may propagate and have an adverse effect, but since a suppression part protruding inward from the side surface of the resonance part is provided, It becomes possible to suppress the propagation of the signal in the next mode and obtain a predetermined / desired pass characteristic.
以下、この発明を図示の実施の形態に基づいて説明する。 The present invention will be described below based on the illustrated embodiments.
（実施の形態１）
図１は、この実施の形態に係る導波管バンドパスフィルタ１を示す斜視図であり、この図では、共振部２や連結部３などの空洞部のみを示しており、実際には図２に示すように、金属製の板状の部材の上面をざぐって（凹状に掘り込んで）、空洞部が形成されている。この導波管バンドパスフィルタ１は、複数の共振部２が連結部３を介して連結され、所定の周波数信号が複数の共振部２を伝播するフィルタである。
(Embodiment 1)
FIG. 1 is a perspective view showing a waveguide bandpass filter 1 according to this embodiment. In this figure, only the cavity such as the resonance part 2 and the connection part 3 are shown. As shown in FIG. 2, a hollow portion is formed by punching the upper surface of a metal plate-like member (digging into a concave shape). The waveguide bandpass filter 1 is a filter in which a plurality of resonating units 2 are connected via a connecting unit 3 and a predetermined frequency signal propagates through the plurality of resonating units 2.
共振部２は、略立方体の空洞であり、伝播方向（図１中ｘ方向）の長さである共振部長さＬ１が、ＴＥ１０２モードの共振部長さに基づいて設定され、伝播方向と直交する方向（図１中ｙ方向）の長さである共振部幅Ｌ２が、ＴＥ１０１モードの共振部幅よりも大きく設定されている。さらに、共振部２の伝播方向に沿った両側面の中央部から内側に突出し、高次のモードの信号の伝播を抑制する抑制部２ａが形成されている。 The resonance part 2 is a substantially cubic cavity, and the resonance part length L1 which is the length in the propagation direction (x direction in FIG. 1) is set based on the resonance part length of the TE102 mode and is orthogonal to the propagation direction. The resonance part width L2 which is the length (in the y direction in FIG. 1) is set larger than the resonance part width of the TE101 mode. Further, a suppression portion 2a that protrudes inward from the central portion of both side surfaces along the propagation direction of the resonance portion 2 and suppresses the propagation of a higher-order mode signal is formed.
具体的には、例えば、伝播・通過させる信号の周波数を６０ＧＨｚ周辺とした場合、ＴＥ１０１モード（標準導波管）では、共振部長さＬ１が３ｍｍ、共振部幅Ｌ２が３．７６ｍｍ、連結部３の長さが１．２ｍｍとなる。これに対して、この導波管バンドパスフィルタ１では、次のように各共振部２の共振部長さＬ１と共振部幅Ｌ２とが設定されている。 Specifically, for example, when the frequency of a signal to be propagated / passed is around 60 GHz, in the TE101 mode (standard waveguide), the resonance part length L1 is 3 mm, the resonance part width L2 is 3.76 mm, and the connection part 3 Becomes 1.2 mm. On the other hand, in this waveguide bandpass filter 1, the resonance part length L1 and the resonance part width L2 of each resonance part 2 are set as follows.
すなわち、まず、ＴＥ１０２モードでは、共振部長さＬ１が６ｍｍとなり、共振部幅Ｌ２を３．７６ｍｍのままにした場合、図３に示すような通過特性Ｃ１および反射特性Ｃ２が得られる。そして、この図から明らかなように、通過帯域の周波数に近い周波数帯域Ａ１において、通過特性Ｃ１が悪化する（不要な周波数信号が通過する）ことが確認される。 That is, first, in the TE102 mode, when the resonance part length L1 is 6 mm and the resonance part width L2 is kept at 3.76 mm, the pass characteristic C1 and the reflection characteristic C2 as shown in FIG. 3 are obtained. As is clear from this figure, it is confirmed that the pass characteristic C1 deteriorates (an unnecessary frequency signal passes) in the frequency band A1 close to the passband frequency.
次に、通過損失をさらに少なくする（Ｑ値を大きくする）ために、共振部幅Ｌ２をＴＥ１０１モードの場合の約２倍の７ｍｍとし、共振部長さＬ１を５ｍｍとした場合、図４に示すような通過特性Ｃ３および反射特性Ｃ４が得られる。そして、この図から明らかなように、通過帯域の周波数に近い周波数帯域Ａ２において、通過特性Ｃ３が著しく悪化することが確認される。ここで、両端に位置する共振部２に接続される端部空洞部４の幅Ｌ３は、３．７６ｍｍに設定されている。 Next, in order to further reduce the passage loss (increase the Q value), the resonance part width L2 is set to 7 mm, which is about twice that in the TE101 mode, and the resonance part length L1 is set to 5 mm, as shown in FIG. Such transmission characteristics C3 and reflection characteristics C4 are obtained. As is clear from this figure, it is confirmed that the pass characteristic C3 is significantly deteriorated in the frequency band A2 close to the passband frequency. Here, the width L3 of the end cavity 4 connected to the resonance part 2 located at both ends is set to 3.76 mm.
このように、共振部２の平面形状・平面積を大きくすると、通過特性Ｃ１、Ｃ３が悪化するため、図１、５に示すように、共振部２の伝播方向に沿った両側面２ｂの中央部から内側に突出する抑制部２ａが形成されている。この抑制部２ａの大きさは、不要な高次のモードの信号の伝播・通過を抑制・防止するように設定されている。すなわち、抑制部２ａを大きくすると、反射・通過損失が大きくなり（Ｑ値が小さくなり）、抑制部２ａを小さくすると、不要な信号が通過してしまうため、これらの点を考慮して、適正な大きさに設定されている。 As described above, when the planar shape and the planar area of the resonance part 2 are increased, the pass characteristics C1 and C3 are deteriorated. Therefore, as shown in FIGS. The suppression part 2a which protrudes inside from a part is formed. The size of the suppression unit 2a is set so as to suppress / prevent propagation / passage of unnecessary high-order mode signals. That is, if the suppression unit 2a is increased, reflection / passage loss increases (Q value decreases), and if the suppression unit 2a is decreased, an unnecessary signal passes. Is set to a large size.
このような抑制部２ａを形成し、共振部長さＬ１を５．２ｍｍとし、共振部幅Ｌ２を７ｍｍとした場合、図６に示すような通過特性Ｃ５および反射特性Ｃ６が得られる。そして、この図から明らかなように、通過特性Ｃ５が良好で、不要な周波数信号が通過しないことが確認される。ここで、端部空洞部４の幅Ｌ３は、３．７６ｍｍに設定されている。また、図５に示すように、共振部２が抑制部２ａで区分される２つの分割共振部２１、２２において、それぞれ電磁界（電場、磁場）が形成されるものである。 When such a suppression portion 2a is formed, the resonance portion length L1 is 5.2 mm, and the resonance portion width L2 is 7 mm, the transmission characteristic C5 and the reflection characteristic C6 as shown in FIG. 6 are obtained. As is apparent from this figure, it is confirmed that the pass characteristic C5 is good and unnecessary frequency signals do not pass. Here, the width L3 of the end cavity 4 is set to 3.76 mm. Further, as shown in FIG. 5, an electromagnetic field (an electric field and a magnetic field) is formed in each of the two split resonance portions 21 and 22 in which the resonance portion 2 is divided by the suppression portion 2 a.
以上のように、この導波管バンドパスフィルタ１によれば、各共振部２の共振部長さＬ１が５．２ｍｍ、共振部幅Ｌ２が７ｍｍで、ともに、ＴＥ１０１モードにおける共振部の共振部長さＬ１である３ｍｍや、共振部幅Ｌ２である３．７６ｍｍよりも大きく設定されている。このため、６０ＧＨｚなどの高周波数帯域の信号を通過させる場合であっても、容易かつ適正に導波管バンドパスフィルタ１を形成・製造することが可能となる。つまり、各共振部２が大きいため、機械加工・ざぐり加工によって精度高くかつ容易に、各共振部２を形成・成形することができるとともに、共振周波数を調整するためのネジなどの素子を、容易かつ適正に配設することができる。 As described above, according to this waveguide bandpass filter 1, the resonance part length L1 of each resonance part 2 is 5.2 mm, the resonance part width L2 is 7 mm, and both are the resonance part lengths of the resonance parts in the TE101 mode. It is set larger than 3 mm which is L1 and 3.76 mm which is the resonance part width L2. For this reason, even when a signal in a high frequency band such as 60 GHz is passed, the waveguide bandpass filter 1 can be formed and manufactured easily and appropriately. That is, since each resonance part 2 is large, each resonance part 2 can be formed and shaped with high accuracy and easily by machining and counterboring, and an element such as a screw for adjusting the resonance frequency can be easily formed. And it can arrange | position appropriately.
一方、共振部２の平面形状・平面積を大きくすることで、高次のモードの信号が伝播し悪影響を与えるおそれがあるが、共振部２の両側面２ｂから抑制部２ａが設けられているため、高次のモードの信号の伝播を抑制・防止し、良好な通過特性Ｃ５を得ることができるものである。 On the other hand, increasing the planar shape / planar area of the resonance unit 2 may cause a high-order mode signal to propagate and have an adverse effect. However, the suppression unit 2a is provided from both side surfaces 2b of the resonance unit 2. Therefore, propagation of higher-order mode signals can be suppressed / prevented and good pass characteristics C5 can be obtained.
（実施の形態２）
この実施の形態では、各共振部２の共振部長さＬ１が、ＴＥ１０３モードの共振部長さに基づいて設定されている点で、実施の形態１と構成が異なり、実施の形態１と同等の構成については、同一符号を付することで、その説明を省略する。
(Embodiment 2)
This embodiment is different from the first embodiment in that the resonance part length L1 of each resonance part 2 is set based on the resonance part length of the TE103 mode, and the same structure as that of the first embodiment. With respect to, the same reference numerals are given and description thereof is omitted.
すなわち、ＴＥ１０３モードでは、共振部長さＬ１が９．２ｍｍとなり、共振部幅Ｌ２を３．７６ｍｍのままにした場合、上記図３の場合と同様に、通過特性が悪化する。次に、通過損失をさらに少なくするために、共振部幅Ｌ２をＴＥ１０１モードの約２倍の７ｍｍとし、共振部長さＬ１を７．４ｍｍとした場合、上記図４の場合と同様に、通過特性が著しく悪化する。 That is, in the TE103 mode, when the resonance part length L1 is 9.2 mm and the resonance part width L2 is kept at 3.76 mm, the pass characteristic is deteriorated as in the case of FIG. Next, in order to further reduce the passage loss, when the resonance part width L2 is set to 7 mm, which is about twice the TE101 mode, and the resonance part length L1 is set to 7.4 mm, as in the case of FIG. Is significantly worse.
一方、各共振部２の両側面２ｂに抑制部２ａを形成し、共振部長さＬ１を７．８ｍｍとし、共振部幅Ｌ２を７ｍｍとした場合、図７に示すような通過特性Ｃ７および反射特性Ｃ８が得られる。そして、この図から明らかなように、通過特性Ｃ７が良好で、不要な周波数信号が通過しないことが確認される。ここで、端部空洞部４の幅Ｌ３は、３．７６ｍｍに設定されている。 On the other hand, when the suppression portion 2a is formed on both side surfaces 2b of each resonance portion 2, the resonance portion length L1 is 7.8 mm, and the resonance portion width L2 is 7 mm, the pass characteristic C7 and the reflection characteristic as shown in FIG. C8 is obtained. As is apparent from this figure, it is confirmed that the pass characteristic C7 is good and an unnecessary frequency signal does not pass. Here, the width L3 of the end cavity 4 is set to 3.76 mm.
このように、この実施の形態によれば、各共振部２の共振部長さＬ１が７．８ｍｍ、共振部幅Ｌ２が７ｍｍで、実施の形態１の場合に比べても、さらに各共振部２が大きく設定されている。このため、より容易かつ適正に導波管バンドパスフィルタ１を形成・製造することができ、この結果、より高い周波数信号に容易に対応することが可能となる。しかも、共振部２の両側面２ｂから抑制部２ａが設けられているため、実施の形態１と同様に、良好な通過特性Ｃ７を得ることができるものである。 Thus, according to this embodiment, the resonance part length L1 of each resonance part 2 is 7.8 mm, and the resonance part width L2 is 7 mm. Is set larger. For this reason, the waveguide band pass filter 1 can be formed and manufactured more easily and appropriately, and as a result, it is possible to easily cope with a higher frequency signal. In addition, since the suppressing portion 2a is provided from the both side surfaces 2b of the resonance portion 2, a good pass characteristic C7 can be obtained as in the first embodiment.
以上、この発明の実施の形態について説明したが、具体的な構成は、上記の実施の形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計の変更等があっても、この発明に含まれる。例えば、上記の実施の形態では、共振部２の両側面２ｂに抑制部２ａを形成しているが、通過させる、あるいは通過させない周波数などに応じて、共振部２の一方の側面２ｂのみに抑制部２ａを形成してもよい。また、ざぐり加工によって抑制部２ａを形成しているが、共振部２の側面２ｂに棒状・柱状の部材を設けてもよい。さらに、上記の実施の形態では、各共振部２の共振部長さＬ１を、ＴＥ１０２モードまたはＴＥ１０３モードの共振部長さに基づいて設定しているが、通過させる周波数などに応じて、その他のモードの共振部長さに基づいて設定してもよい。 Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above-described embodiment, the suppression unit 2a is formed on both side surfaces 2b of the resonance unit 2, but the suppression is performed only on one side surface 2b of the resonance unit 2 depending on the frequency to pass or not to pass. The part 2a may be formed. Moreover, although the suppression part 2a is formed by counterboring, you may provide a rod-shaped / columnar member on the side surface 2b of the resonance part 2. Furthermore, in the above-described embodiment, the resonance length L1 of each resonance section 2 is set based on the resonance section length of the TE102 mode or the TE103 mode. You may set based on the resonance part length.
１ 導波管バンドパスフィルタ
２ 共振部
２ａ 抑制部
２ｂ 側面
３ 連結部
Ｌ１ 共振部長さ
Ｌ２ 共振部幅
DESCRIPTION OF SYMBOLS 1 Waveguide band pass filter 2 Resonance part 2a Suppression part 2b Side surface 3 Connection part L1 Resonance part length L2 Resonance part width
Claims (1)
前記共振部の伝播方向の長さである共振部長さが、ＴＥ１０ｎ（ｎは２以上の整数）モードの共振部長さに基づいて設定され、
前記共振部の伝播方向と直交する方向の長さである共振部幅が、ＴＥ１０１モードの共振部幅よりも大きく設定され、
前記共振部の伝播方向に沿った側面の少なくとも一方から内側に突出し、高次のモードの信号の伝播を抑制する抑制部が設けられている、
ことを特徴とする導波管バンドパスフィルタ。
A waveguide bandpass filter in which a plurality of resonating parts that are substantially cubic cavities are connected, and a signal propagates through a plurality of the resonating parts,
The resonance part length, which is the length in the propagation direction of the resonance part, is set based on the resonance part length of the TE10n (n is an integer of 2 or more) mode,
The resonance part width which is the length in the direction orthogonal to the propagation direction of the resonance part is set larger than the resonance part width of the TE101 mode,
A suppression unit that protrudes inward from at least one of the side surfaces along the propagation direction of the resonance unit and suppresses the propagation of a higher-order mode signal is provided,
A waveguide bandpass filter characterized by that.
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| JP2011247034A JP5888939B2 (en) | 2011-11-11 | 2011-11-11 | Waveguide bandpass filter |
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| JP2011247034A JP5888939B2 (en) | 2011-11-11 | 2011-11-11 | Waveguide bandpass filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9991576B2 (en) | 2015-03-24 | 2018-06-05 | Fujitsu Limited | Electronic apparatus case |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08330809A (en) * | 1995-05-26 | 1996-12-13 | Nec Corp | Band pass filter |
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2011
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08330809A (en) * | 1995-05-26 | 1996-12-13 | Nec Corp | Band pass filter |
Non-Patent Citations (2)
| Title |
|---|
| JPN6015040623; Ｆ．Ｊ．Ｐ．Ｓｏｌｅｒ ｅｔ ａｌ．: '"Ｄｅｓｉｇｎ ｏｆ Ｂａｎｄｐａｓｓ Ｅｌｌｉｐｔｉｃ Ｆｉｌｔｅｒｓ Ｅｍｐｌｏｙｉｎｇ Ｉｎｄｕｃｔｉｖｅ Ｗｉｎｄｏｗｓ ａｎｄ Ｄｉｅｌｅｃｔｒｉｃ Ｏｂｊｅｃｔｓ "' ＩＥＥＥ ｔｒａｎｓａｃｔｉｏｎｓ ｏｎ Ｍｉｃｒｏｗａｖｅ ｔｈｅｏｒｙ ａｎｄ Ｔｅｃｈｎｉｑｕｅｓ Ｖｏｌ．５５，Ｎｏ．１１, 200711, ｐｐ．２３９３ - ２３９８ * |
| JPN6015040626; Ｍ．Ｇｕｇｌｉｅｌｍｉ ｅｔ ａｌ，: '"Ａ ｎｅｗ ｆａｍｉｌｙ ｏｆ ａｌｌ-ｉｎｄｕｃｔｉｖｅ ｄｕａｌ-ｍｏｄｅ ｆｉｌｔｅｒｓ "' ＩＥＥＥ ｔｒａｎｓａｃｔｉｏｎｓ ｏｎ Ｍｉｃｒｏｗａｖｅ ｔｈｅｏｒｙ ａｎｄ Ｔｅｃｈｎｉｑｕｅｓ Ｖｏｌ．４９，Ｎｏ．１０, 200110, ｐｐ．１７６４ - １７６９ * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9991576B2 (en) | 2015-03-24 | 2018-06-05 | Fujitsu Limited | Electronic apparatus case |
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