Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2001-08-09
2002-08-06
Chervinsky, Boris (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S689000, C361S721000, C361S727000, C361S736000, C361S741000, C361S752000, C361S756000, C165S104330, C211S041170, C454S184000, C312S223200
Reexamination Certificate
active
06430046
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mount shelf for an electronic circuit board. More particularly, the present invention relates to a mount shelf for an electronic circuit board, which has an excellent air permeability at a condition that an electronic circuit board is positioned and mounted in a body plate and also has an excellent radiation performance with regard to a heat generated by a part of the electronic circuit.
2. Description of the Related Art
As known in Japanese Laid Open Utility Model Application (JU-A-Showa, 64-387) and Japanese Laid Open Patent Application (JP-A-Heisei, 8-23181), an electronic circuit board is assembled in an electronic apparatus, such as a computer and a communication apparatus, and it is mounted in a body plate. The electronic circuit board mounted in a shelf structure requires the protection against heat generated by it. The shelf which is a mount technique for improving the heat radiation performance is known as shown in FIG.
1
. The body plate for embodying the known shelf is constituted by a side plate
101
, a ceiling plate
102
and a bottom plate
103
. Opposite positioning grooves
106
,
107
are formed on an upper guide plate
104
and a lower guide plate
105
which are respectively attached to edges of the ceiling plate
102
and the bottom plate
103
. An electronic circuit board
108
is positioned in upper and lower edge regions of the positioning grooves
106
,
107
, and inserted towards the side plate
101
. A large number of long holes
109
,
110
are made in the ceiling plate
102
and the bottom plate
103
. Guide rims
111
,
112
are formed in the edges of the long holes
109
,
110
. Both ends of the rims
111
,
112
are cylindrically formed. A tip end of the electronic circuit board
108
is guided between the planes of the cylinders adjacent to each other, and inserted towards the side plate
101
.
At that mount position, a connector
113
attached to the electronic circuit board
108
is electrically connected to a connector
114
attached to the side plate
101
. The electrically attached parts of the connectors
113
,
114
are constituted by minute metallic parts. In order to effectively connect such minute metallic parts, the relatively positional relations must be accurate between the long holes
109
,
110
and the positioning grooves
106
,
107
. The positional relations must be accurate as a three-dimension, as represented by the three-dimensional coordinates in FIG.
1
. Actually, the dimensional setting must be relationally accurate between a Z-axis direction distance A between the side plate
101
and the upper and lower guide plates
105
,
106
, X-axis direction distances B, C from the standard positions of the upper and lower positioning grooves
106
,
107
and a Y-axis direction distance D between the upper and lower positioning grooves
106
,
107
. If such a dimensional setting is not accurate, a travel direction E when the electronic circuit board is inserted is not accurately coincident with the set Z-axis direction. Even if the mount position is approximately accurate, the electrical connection becomes imperfect between the connectors
113
,
114
. If the unreasonably pushing force at the time of the insertion is excessive, the electrical connection becomes imperfect. Such known structure requires the highly precise design in order to attain the excellently electrical connection. This results in the increase in a manufacturing cost. Moreover, the plates constituting the large number of holes resist the flow of the air flowing from a lower portion to an upper portion. This resistance causes the flow to be deteriorated. Thus, the air flow becomes the turbulent flow, which causes the heat radiation performance to be poor.
The positioning accuracy is desired to be high. In particular, it is desirable that the unreasonably excessive force is not applied at the time of the insertion, the insertion is smooth, and the positioning accuracy is high. Moreover, the heat radiation performance is desired to be high. It is further required to simplify the shelf structure and drop the manufacturing cost.
Japanese Laid Open Patent Application (JP-A-Showa, 59-181692) discloses the following positioning apparatus of printed circuit board. This positioning apparatus of printed circuit board transfers the printed circuit board to a station to perform a operation such as parts mounting. The positioning apparatus of printed circuit board is provided with: a plurality of guide means for guiding right and left end portions of the printed circuit board to the station. One of the plurality of guide means can move in a direction at right angles to a transferring direction of the printed circuit board. The other of the plurality of guide means cannot move. A plurality of positioning pins to be inserted in reference holes of the printed circuit board are provided in the transferring direction at established intervals. A part of the plurality of positioning pins can move only in the direction at right angles to the transferring direction of the printed circuit board. Another part of the plurality of positioning pins can move in both the direction at right angles to the transferring direction of the printed circuit board and the transferring direction.
SUMMARY OF THE INVENTION
The present invention is accomplished in view of the above mentioned problems. Therefore, an object of the present invention is to provide a mount shelf for an electronic circuit board, in which a positioning accuracy is high and a cost can be dropped.
Another object of the present invention is to provide a mount shelf for an electronic circuit board, in which an unreasonably excessive force is not applied at a time of an insertion, an insertion is smooth, a positioning accuracy is high, and a cost can be dropped.
Still another object of the present invention is to provide a mount shelf for an electronic circuit board, in which a positioning accuracy is high, a cost can be dropped, and a heat radiation performance is high.
Still another object of the present invention is to provide a mount shelf for an electronic circuit board, in which when a shelf body is made of metal, the abovementioned problems can be effectively solved.
In order to achieve an aspect of the present invention, a mount shelf for an electronic circuit board, includes: a body; a first guide which is supported by the body and has a first guide plane; a second guide which is supported by the body and has a second guide plane; a third guide which is supported by the body and has a third guide plane; and a fourth guide which is supported by the body and has a fourth guide plane, and wherein the first guide plane and the second guide plane respectively have first contact planes on which a first end plane portion of one straight first edge region of an electronic circuit board can be contact at a same time, and wherein the third guide plane and the fourth guide plane respectively have second contact planes on which a second end plane portion of another straight second edge region of the electronic circuit board can be contact at the same time, and wherein the first guide and the second guide are separated to a degree of a width in a direction in which the first edge region or the second edge region of the electronic circuit board is extended and wherein the third guide and the fourth guide are separated to the degree of the width.
In this case, the first contact plane includes two first slants which are located opposite to each other, and slanted in directions opposite to each other, and in forms of substantially circular cone plane, and wherein the second contact plane includes two second slants which are located opposite to each other, and slanted in directions opposite to each other, and in forms of substantially circular cone plane.
Also in this case, the first and second edge regions are approximately parallel to each other.
Further in this case, the first end plane portion contains two first end lines parallel to each other, an
Chervinsky Boris
McGinn & Gibb PLLC
NEC Corporation
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