Electronic circuit unit and its sealed structure
View Patent ↗A first frame is arranged on a printed circuit board to enclose a first circuit that radiates a noise. The printed circuit board also has mounted thereon a second circuit that has a need to be protected from the noise. A second frame is arranged on the printed circuit board to enclose the second circuit. The second frame is separated from one side of the first frame by a given clearance area, and the second frame has an open side facing the one side of the first frame.
1. An electronic circuit unit comprising:
a printed circuit board mounted with a first circuit and a second circuit;
a first frame arranged on the printed circuit board around the first circuit;
a second frame arranged on the printed circuit board around the second circuit, said second frame being separated from one side of the first frame by a given clearance area, and said second frame having an open side facing the one side of the first frame;
a first cover which closes an upper opening portion of the first frame; and
a second cover which is independent of the first frame, and which closes an upper opening portion of the second frame;
wherein at least one of the first and second covers comprises an extended portion that overlaps the other of the first and second covers.
2. An electronic circuit unit comprising:
a printed circuit board mounted with a first circuit that radiates a noise and a second circuit that has a need to be protected from the noise;
a first frame arranged on the printed circuit board around the first circuit;
a second frame arranged on the printed circuit board around the second circuit, said second frame being separated from one side of the first frame by a given clearance area, and said second frame having an open side facing the one side of the first frame;
a first cover which closes an upper opening portion of the first frame; and
a second cover which is independent of the first frame, and which closes an upper opening portion of the second frame;
wherein at least one of the first and second covers comprises an extended portion that overlaps the other of the first and second covers.
3. The unit according to claim 2 , wherein at least one of the first and second frames comprises a bridge member extending between opposing sides thereof.
4. The unit according to claim 3 , wherein the bridge member comprises an adsorption member for lifting up the frame.
5. A shield structure comprising:
a first frame arranged on a printed circuit board around a first circuit, said printed circuit board also having mounted thereon a second circuit;
a second frame arranged on the printed circuit board around the second circuit, said second frame being separated from one side of the first frame by a given clearance area, and said second frame having an open side facing the one side of the first frame;
a first cover which closes an upper opening portion of the first frame; and
a second cover which is independent of the first frame, and which closes an upper opening portion of the second frame;
wherein at least one of the first and second covers comprises an extended portion that overlaps the other of the first and second covers.
6. A shield structure comprising:
a first frame arranged on a printed circuit board around a first circuit that radiates a noise, said printed circuit board also having mounted thereon a second circuit that has a need to be protected from the noise;
a second frame which is arranged on the printed circuit board around the second circuit, said second frame being separated from one side of the first frame by a given clearance area, and said second frame having an open side facing the one side of the first frame;
a first cover which closes an upper opening portion of the first frame; and
a second cover which is independent of the first frame, and which closes an upper opening portion of the second frame;
wherein at least one of the first and second covers comprises an extended portion that overlaps the other of the first and second covers.
7. The structure according to claim 6 , wherein at least one of the first and second frames comprises a bridge member extending between opposing sides thereof.
8. The structure according to claim 7 , wherein the bridge member comprises an adsorption member for lifting up the frame.