JP2009065063A - Structure for mounting printed boards - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for mounting printed boards capable of properly mounting printed boards having different substrate thicknesses without adding any design change and working. <P>SOLUTION: In the structure for mounting printed boards plug-connecting a printed board 10 with a back board of a shelf, it is possible to easily receive printed boards having different substrate thicknesses by providing a rail groove 21 having a different width on a peripheral surface in the longitudinal direction of a guide rail 20 for guiding the printed board 10 to the back board. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a printed circuit board mounting structure, and is particularly suitable for application to a printed circuit board mounting structure in which a printed circuit board is plug-in connected to a backboard on the back of a shelf.

  7 is an external view of a conventional shelf (also referred to as a rack) 100 ′. FIG. 7A is a bottom view of the shelf 100 ′ viewed from the bottom plate direction (the same applies to the top plate direction), and FIG. It is the front view which looked at 100 'in the insertion direction of the printed board. In the figure, 101 is a backboard on the back of the shelf, 102 is a stay (equivalent to a top plate and a bottom plate) spanned between the sides of the shelf, 110 is a printed board (also called a card) on which electronic components are mounted, and 120 is a top of the shelf. A plurality of guide rails arranged opposite to the plate and the bottom plate. With such a configuration, each guide rail 120 guides a board connector (not shown) provided on the front surface of the printed board 110 to a backboard connector (not shown) arranged on the front surface of the backboard 101.

  Conventionally, a guide rail 120 having a groove width adapted to the thickness of each printed board 110 is fixed in accordance with the mounting (slot) pitch of each printed board. More specifically, for example, slot numbers 1 to 7 are provided with a guide rail A having a groove width suitable for the thickness A of the printed board at a slot pitch PA, and slot numbers 8 to 28 are provided with the thickness of the printed board. A guide rail B having a groove width conforming to the length B is mounted at a slot pitch PB, and a guide rail C having a groove width conforming to the thickness C of the printed board is mounted at a slot pitch PC in slot numbers 29 to 32. It was.

  By the way, in the electronic apparatus using this type of shelf, the following problems occur when the thickness of the printed board (the number of multilayer boards) is changed due to the upgrade of the model or the development of a new model. That is, when resin rails are used, it is necessary to newly design resin rails in accordance with the thickness of the printed board. However, since resin products usually start molds, mold start costs are incurred. In addition, the existing resin rail can be machined to change the rail width, but the processing cost will lead to an increase in the unit cost.

  On the other hand, when the rail is formed by the sheet metal drawing, the sheet metal has to be changed. However, since it is necessary to newly manufacture the sheet metal drawing die, an extra cost is required. In either case, the number of management man-hours increases because the types of parts increase by newly designing or changing the mounting parts of the printed board.

Conventionally, one guide rail is provided by installing a rotating guide having a groove-type passage intersecting with the guide rail in the area between each guide rail and backboard of the shelf bottom plate and the top plate. A structure of a printed board guide rail that can cope with the thickness of two types of printed boards is known (Patent Document 1).
JP 04-042997

  However, the above-described conventional guide rail requires at least two types of parts, that is, a guide rail main body and a rotation guide, and therefore does not contribute much to the reduction of the type of parts and the cost of starting a mold. In addition, since the optimum groove width for the thickness of the printed board is not obtained over the entire length of the guide rail, the posture of the printed board may be swung from side to side when the printed board is inserted. There was also a risk of contact with the mounted components.

  Also, the mounting pitch (slot width) of the printed board is a structure in which guide rails are attached to slot holes processed at a preset pitch. It had to be newly designed.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a printed board mounting structure capable of appropriately mounting printed boards having different thicknesses without requiring any special design change or processing. There is.

  The printed circuit board mounting structure according to the first aspect of the present invention is a printed circuit board mounting structure in which the printed circuit board is plug-in connected to the backboard on the back of the shelf, and the length of the guide rail for guiding the printed circuit board to the backboard. Rail grooves having different groove widths are provided on the circumferential surface in the direction.

  According to the present invention, it is possible to easily cope with the thickness of various types of printed boards without replacing parts. Therefore, it is a short time to improve the level of electronic equipment using this type of shelf or to newly develop it. And can be handled at low cost. It is also possible to easily mount a plurality of printed boards having different thicknesses in the same shelf.

  In the second aspect of the present invention, the guide rail is provided with a rail groove on a peripheral surface of a member based on an n-prism (where n is an integer of 3 or more). Accordingly, it is possible to properly guide printed boards having different thicknesses of 3, 4, 5, 6 and the like with one guide rail without rattling.

  In the third aspect of the present invention, the guide rail is provided with a rail groove on a peripheral surface of a cylinder-based member. Therefore, rail grooves having different groove widths can be arranged in any manner on the peripheral surface of the cylinder.

  In the fourth aspect of the present invention, a mark for identifying the groove width is provided on the surface of the guide rail where the rail groove is provided. Therefore, it is easy to select the groove width when mounting the guide rail.

  According to a fifth aspect of the present invention, there is further provided a rail canug that is fixed to the top plate and the bottom plate of the shelf, wherein the guide rail is inserted and held from an end portion of the rail canag. Therefore, it is possible to easily mount the guide rail on the shelf by selecting a groove width that matches the thickness of the printed board to be mounted.

  In the sixth aspect of the present invention, the rail kana includes a kanag mounting opening having a size covering at least two adjacent kanag mounting slots provided at a predetermined pitch on the top plate and the bottom plate.

  According to the present invention, since one or more canag mounting slots can always be seen in the opening portion of the canag mounting size that covers two adjacent canag mounting slots, It is possible to shift and fix the guide rail) at an arbitrary position. Therefore, the guide rail can be fixed at an arbitrary position on the top plate and the bottom plate. That is, the guide rail can be mounted at an arbitrary mounting pitch.

  In addition, according to the present invention, it is possible to easily cope with the mounting pitch (thickness) of various printed boards without replacing parts. Therefore, for the level up or new development of electronic equipment using this type of shelf. Can be handled in a short period of time and at a low cost. In addition, a plurality of printed boards having different thicknesses can be mounted at a desired pitch in the same shelf.

  In the seventh aspect of the present invention, the predetermined pitch is ½ or more of the minimum pitch for mounting the printed board on the shelf. Therefore, the printed board can be fixed at an arbitrary position up to the minimum pitch for mounting.

  The mounting structure of the printed board according to the eighth aspect of the present invention is a rail mounting that is fixed to the top plate and the bottom plate of the shelf in the printed board mounting structure in which the printed board is plug-in connected to the back board on the back of the shelf, The guide rail is inserted and held from the end of the rail kanagu, and one or two or more rail grooves having different groove widths are provided on the peripheral surface in the longitudinal direction of the guide rail.

  According to the present invention, not only when a plurality of rail grooves are provided on the guide rail, but also when a single rail groove is provided, a guide rail having different groove widths is prepared in advance. This kind of shelf that satisfies the mounting specifications can be provided in a short period of time and at a low cost.

  As described above, according to the present invention, the design assets of the shelf can be diverted even when the thickness or mounting pitch of the substrate is changed during the development of the next model. As a result, man-hours can be concentrated at locations where new development is required, leading to improved design efficiency. In addition, when diverted to the next model or other models, it is possible to share parts, so initial costs such as mold costs do not occur. Also, parts costs are reduced due to mass production effects. Effective in reducing product costs. In addition, when the present invention is applied to a test apparatus, it can be used as various types of test apparatuses, which is effective in reducing apparatus development costs.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the same reference numerals denote the same or corresponding parts throughout the drawings. FIG. 1 is an external view of a shelf 100 according to the embodiment. FIG. 1A is a bottom view of the shelf 100 viewed in the bottom plate direction (the same applies to the top plate direction), and FIG. It is the front view seen in the insertion direction. In the figure, 101 is a backboard on the back of the shelf, 102 is a stay (equivalent to a top plate and a bottom plate), 10 is a printed board on which electronic components (not shown) are mounted, 20 is a guide rail for guiding the printed board 10, and 30 is A rail kana (rail fitting) that holds the guide rail 20. With such a configuration, each guide rail 20 accurately guides the board connector 15 provided on the rear surface of the printed board 10 to the backboard connector 105 arranged on the front surface of the backboard.

  This guide rail 20 is provided with rail grooves having different groove widths on the peripheral surface in the longitudinal direction, and is inserted into the rail kana 30 with the rail groove having a groove width matching (matching) the thickness of the printed board 10 to be mounted facing upward. Has been. For example, in slot numbers 1 to 6, the rail groove A suitable for the thickness A of the printed board is inserted into the rail kana 30 with the rail groove A facing upward, and in slot numbers 7 to 13 the rail groove suitable for the thickness B of the printed board. It is inserted into the rail kana 30 with B facing up.

 Further, the rail cangs 30 of the slot numbers 1 to 6 are fixed to the stay 102 at the mounting pitch PA corresponding to the thickness A of the printed board by using the wide canag attaching window 34, and the slot numbers 7 to 13 are used. Similarly, each rail kana 30 is fixed to the stay 102 at a mounting pitch PB corresponding to the thickness B of the printed board. In this way, according to the guide rail unit comprising the guide rail 20 and the rail kana 30 of the present embodiment, it is possible to easily cope with the desired printed board thickness and mounting pitch, and the shelf 100 can be used effectively. This will be described in detail below.

FIG. 2 is a mounting structure diagram of the printed board according to the embodiment. FIG. 2A is a front view of the printed board 10 viewed in the insertion direction, and FIG. 2B is a side view of FIG. Although not shown, a similar mounting structure is also disposed on the upper side of the printed board 10 so as to face each other. In FIG. 2A, an example guide rail 20 is formed based on a square column (cuboid) having a regular square cross section, and four rail grooves 21 having different groove widths are formed on four surfaces in the longitudinal direction. Is provided. Therefore, four types of substrate thicknesses can be handled.

  The guide rail 20 is inserted into the rail fitting 30 with the rail groove 21 to be used facing upward. As a result, the bottom surface of the guide rail 20 is supported by the floor surface of the rail kana 30 and the L groove 22 provided on the diagonal line of the cross section of the guide rail engages with the flange portion 32 of the rail kana 30 so that the left and right sides of the guide rail 20 are The position of the direction is regulated. Thus, the guide rail 20 is stably held by the rail kana 30. The rail hook 30 is screwed to a predetermined position of the stay 102 using the wide hook attachment window 34 of the hook attachment 33 provided at the end thereof.

  In FIG. 2B, a front panel 11 formed of aluminum alloy or sheet metal is provided on the front side (left side) of the printed board 10. The front panel 11 has a function of electromagnetically shielding the printed board 10, providing an alarm LED and a reset switch (not shown), and taking a frame ground FG by bringing a part of the front panel 11 into contact with the shelf 100. Have both. Further, an ejector lever 12 for facilitating the insertion / extraction operation of the printed board 10 is attached to the upper and lower end portions of the front panel 11 so as to be rotatable around a pivot pin 13 provided on the substrate 10.

  With such a configuration, when the printed board 10 is inserted into the guide rail 20 while the ejector lever 12 is opened downward, the board connector 15 at the front end of the printed board is accurately guided to the front surface of the backboard connector 105. The When the ejector lever 12 is further pushed forward (right side in the figure) in this state, the claw at the upper end of the ejector lever 12 engages with the L-shaped convex portion of the stopper 35 fixed to the stay 102, and By the lever action with the pivot pin 13 as a fulcrum, the connectors 15 and 105 are securely inserted, thus completing the plug-in operation. When the printed board 10 is extracted, the ejector lever 12 may be returned to the direction of the dotted line 12 'in the drawing.

  FIG. 3 is an assembly explanatory view of the guide rail unit according to the embodiment. FIG. 3A shows an example guide rail 20. The guide rail 20 is formed with a quadrangular prism as a base, and rail grooves 21 having different groove widths are formed on four surfaces in the longitudinal direction. Further, four L grooves 22 are provided on the diagonal line of the four cross-sections, and this portion engages with the flange portion 32 of the rail kana 30 so that the posture of the guide rail 20 (the movement in the direction perpendicular to the long axis). ).

  By rotating such a guide rail 20 around its long axis and inserting it into the rail kana 30, the rail groove having a desired groove width can be set upward. Since the groove width of the guide rail 20 conforms (matches) with the thickness of the printed board 10 over the entire length, rattling from the left and right is regulated from the beginning of the loading of the printed board 10, and there is no fear that the mounted components come into contact. Therefore, the board connector 15 of the printed board 10 is correctly guided with respect to the backboard connector 105, and both connectors are properly fitted.

  The guide rail 20 in this example is made of a resin molded product. However, when the heavy printed board 10 is mounted, the guide rail 20 may be formed by aluminum die casting. However, even if it is a resin molding, the intensity | strength is fully reinforced by inserting in the rail kana 30. FIG.

FIG. 3B shows a plan view of the rail kana 30. At the right end of the rail kana 30, both side walls are bent into an L shape to form a stopper 31, and the stopper 31 abuts against the tip end of the guide rail to prevent further insertion. In the main body portion of the rail kana 30, four convex pieces are provided on both side walls, and the flange portion 32 is formed by bending them inward. When the guide rail 20 is inserted, the L groove 22 of the guide rail 20 and the flange portion 32 of the rail kana 30 are engaged to hold the guide rail 20 in an appropriate posture. Further, when the guide rail 20 is inserted to the heel, the stopper 35 is pressed against the rear end portion of the guide rail 20 and is screwed using the notch 36. This prevents the return of the guide rail 20, and thus the guide rail 20 is firmly fixed to the rail kana 30.

  FIG. 3C shows a side view of FIG. The floor plate of the rail kana 30 is bent in an L shape downward at the rear end (the same applies to the tip on the right side in the figure), and this portion forms a kana mounting portion 33 for attaching the rail kana 30 to the stay 102. . A canag attachment window 34 having a predetermined opening width is provided at the approximate center of the canag attachment portion 33, and the canag attachment position can be adjusted in the lateral direction by the canag attachment window 34.

  FIG. 4 is an explanatory diagram of a rail-canag positioning method according to the embodiment. The guide rail 20 has a rail groove A having a groove width adapted (matched) to the thickness A of the printed board on the upper surface, and rail grooves B to D having other groove widths on the second surface to the fourth surface. have. By rotating the guide rail 20 as necessary and inserting it into the rail kana 30, the shelf 100 can accommodate four types of printed boards 10.

  On the other hand, the stays 102 of the shelf 100 are provided with mounting holes (slots) 103 for the rail kana 30 at a predetermined pitch PR. The predetermined pitch PR is selected to have a length (8 mm) that is approximately ½ of the minimum mounting pitch (for example, 16 mm) of the printed board required for the present system, for example. On the other hand, the width of the rail mounting window 34 of the rail rack 320 is selected so that at least two rail rack mounting holes 103 can be seen at the same time. As a result, regardless of the position of the rail hook 30, one or more hook mounting holes 103 can always be seen in the hook mounting window 34, and the rail hook 30 can be fixed at an arbitrary position on the stay 102. .

  That is, when considering the case where the rail kana 30 is moved in the direction of the right (arrow a) from the state where the two slots S1 and S2 are visible, the rail kana 30 is initially used regardless of which of the slots S1 and S2. It can be fixed at the position shown. Next, when the position is slightly shifted to the right, only the slot S2 is visible, and the rail kana 30 can be shifted and fixed at an arbitrary position using the slot S2. Thus, when the rail kana 30 eventually reaches the position 30 'indicated by the dotted line, the rail kana 30 can be fixed at that position using either of the slots S2 and S3. The same applies hereinafter. The same applies to the case where the rail kana 30 is moved to the left side. Thus, according to the present embodiment, the printed board 10 having a desired thickness can be mounted at a desired position of the stay 102 (that is, at a desired mounting pitch) without any special design change or processing.

  FIG. 5 is a cross-sectional view of various guide rails according to another embodiment. FIG. 5A shows an example of a guide rail based on a prism having a pentagonal cross section, and five rail grooves A to E having different groove widths are provided on the peripheral surface in the longitudinal direction. Therefore, it is possible to cope with the thickness of five types of printed boards with one guardrel 20. Further, the flange portion 32 of the rail kana 30 of this example has a tip end face which is obliquely cut and has a shape suitable for engaging with the wall surface of the guide rail 20 having a pentagonal cross section. Preferably, the floor surface of the rail kana 30 is provided with a concave groove 39 for receiving a ridge line portion of a pentagonal column.

FIG. 5B shows an example of a guide rail based on a prism having a hexagonal cross section, and six rail grooves A to F having different groove widths are provided on the peripheral surface in the longitudinal direction. Therefore, it is possible to deal with six types of printed board thickness with one guardrel 20.

  FIG. 5C shows an example of a guide rail based on a circular cylinder having a circular cross section. For example, three rail grooves A to C having different groove widths are provided on the peripheral surface in the longitudinal direction. Therefore, it is possible to cope with the thickness of three types of printed boards with one guardrel 20. When the cylinder is used as a base, there is no surface that defines the peripheral surface, and therefore there is an advantage that the rail groove 21 having various groove widths and the concave groove 22 necessary for fixing can be laid out in a free manner on the circumferential surface.

  As described above, the guide rail 20 of the present invention can be basically configured based on a prism having an n-shaped cross section (where n is an integer of 3 or more) or a circular cylinder having a circular cross section. Preferably, as shown in the figure, the prism is a square column having a regular n-square cross section or a circular cylinder having a true circular cross section, but the present invention is not limited to this. You may comprise based on the prism with a substantially n-square cross section, or the cylinder with an elliptical cross section.

  FIG. 5D shows an example of a guide rail based on a rectangular column having a rectangular cross section, and a rail groove A having a single groove width is provided on the peripheral surface in the longitudinal direction. In this example, it is not possible to cope with different groove widths by replacing the single guide rail 20, but the thickness of the printed board 10 can be obtained by preparing the guide rails 20 having at least different groove widths or at least their molds in advance. Can be changed easily and at low cost.

  FIG. 6 is a diagram for explaining a guide rail fixing method according to another embodiment, and shows a case where the guide rail 20 can be prevented from falling off without using the stopper 35. FIG. 6A shows a side surface of the rail kana 30 for reference. In FIG. 6B, the guide rail 20 of this example has two protrusions for restricting the movement of the guide rail 20 in the longitudinal direction by engaging the flange portion 32 of the rail kana 30 with a part of the L groove 22. The unit 23 is provided.

  In FIG. 6 (c), when such a guide rail 20 is inserted, the preceding convex portion 23 abuts against the flange portion 32, and the convex portion 23 is bent by the elasticity of the resin so as to avoid the flange portion 32. Go ahead. In FIG. 6D, when the guide rail 20 is further inserted, the leading convex portion 23 engages with the right wall of the flange portion 32, and the trailing convex portion 23 hits the left wall of the flange portion 32. Both walls of the flange portion 32 are sandwiched between the two convex portions 23. Therefore, in this example, the stopper 35 can be omitted. When the stopper 35 is omitted, another known card ejector mechanism that does not use the stopper 35 can be employed.

  Moreover, the guide rail 20 of FIG. 6 is provided with a mark for identifying the groove width of the rail groove on the surface provided with the rail groove 21. In the example in the figure, a number (meaning 2.0 mm) that directly represents the groove width of the rail groove 21 is engraved. In addition, a number, symbol, pattern, color classification, or the like that indirectly represents the groove width may be employed.

  In the above embodiment, the case where the guide rail 20 is inserted into the rail kana 30 and used is described, but the present invention is not limited to this. When adjustment of the mounting pitch (slot width) of the printed board 10 is not necessary, the guide rail 20 may be directly fixed to the top plate or the bottom plate. FIG. 6E shows an example guide rail 20 in this case. The guide rail 20 is provided with a screw hole 25 which is crossed in a cross shape so that the guide rail 20 can be directly fixed to the top plate or the bottom plate even if it is rotated as it is or 90 °.

Further, although the preferred embodiment of the present invention has been described, it goes without saying that various changes in the configuration, control, processing, and combination of each part can be made without departing from the spirit of the present invention.

It is an external view of the shelf by embodiment. It is the mounting structure figure of the printed circuit board by embodiment. It is assembly explanatory drawing of the guide rail unit by embodiment. It is explanatory drawing of the rail kanagu positioning method by embodiment. It is sectional drawing of the various guide rail by other embodiment. It is a figure explaining the guide rail fixing method by other embodiment. It is a figure explaining a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Printed board 11 Front panel 12 Ejector lever 13 Pivoting pin 15 Board connector 20 Guide rail 21 Rail groove 22 L groove 23 Convex part 30 Rail kana (rail metal fittings)
31 Stopper 32 Flange part 33 Canag mounting part 34 Mounting window 35 Stopper 100 Shelf 101 Backboard 102 Stay 103 Rail mounting part (slot)
105 Backboard connector

Claims (8)

In the printed board mounting structure in which the printed board is plugged into the back board on the back of the shelf,
A printed board mounting structure, wherein rail grooves having different groove widths are provided on a peripheral surface in a longitudinal direction of a guide rail for guiding the printed board to a back board. The printed board mounting structure according to claim 1, wherein the guide rail is provided with a rail groove on a peripheral surface of a member based on an n-prism (where n is an integer of 3 or more). The printed board mounting structure according to claim 1, wherein the guide rail is provided with a rail groove on a peripheral surface of a member having a cylindrical base. 2. The printed board mounting structure according to claim 1, wherein a mark for identifying the groove width is provided on a surface of the guide rail on which the rail groove is provided. The printed board mounting structure according to claim 1, further comprising: a rail kana fixed to the top plate and the bottom plate of the shelf, wherein the guide rail is inserted and held from an end of the rail kana. . 6. The printed board according to claim 5, wherein the rail kana includes a kanag mounting opening having a size covering at least two adjacent kanag mounting slots provided at a predetermined pitch on the top plate and the bottom plate. Implementation structure. The printed board mounting structure according to claim 6, wherein the predetermined pitch is ½ or more of a minimum pitch for mounting the printed board on the shelf. In the printed board mounting structure in which the printed board is plugged into the back board on the back of the shelf,
A rail canug that is fixed to the top plate and bottom plate of the shelf, the guide rail being inserted and held from the end of the rail canag,
A printed board mounting structure, wherein one or two or more rail grooves having different groove widths are provided on a peripheral surface in a longitudinal direction of the guide rail.

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