JP4480082B2 - Printed circuit board holding device and printed circuit board holding method. - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board holding device and a holding method for screwing and fixing a printed circuit board to a frame in an electric and electronic apparatus such as an image forming apparatus using the printed circuit board. Among them, in particular, a printed circuit board holding device that cuts and raises a part of the sheet metal frame on the back side of the plate surface to form a printed circuit board mounting portion, and stacks the printed circuit board directly on the printed circuit board mounting portion and is fixed with a fixing screw. And a holding method.

  Conventionally, when mounting a printed circuit board on a frame, in order to prevent the circuit pattern of the printed circuit board from shorting, in general, a part of the printed circuit board is supported and the other part is held floating from the frame. Yes. When the frame is a resin or a casting, for example, as shown in FIG. 6, a boss portion 2 is formed on the frame 1, and the printed board 3 is fixed to the boss portion 2 with a fixing screw 4. 3 was held.

  In the case where the frame is a sheet metal frame, for example, as shown in FIGS. In FIG. 7, a snap-fit member is used as the spacer 5, and the conical part 5a at one end is press-fitted into the engaging hole 1a of the frame 1 and the conical part 5b at the other end is press-fitted into the engaging hole 3a of the printed circuit board 3. The printed circuit board 3 is held by hanging.

  In FIG. 8, a collar member is used as the spacer 5, the fixing screw 4 is inserted into the insertion hole 3b of the printed board 3, and is screwed to the screw hole 1b of the frame 1 through the center hole 5c of the collar member. In FIG. 9, a stud member with male and female screws is used as the spacer 5, and the male member 5 d of the stud member is screwed into the screw hole 1 b and the stud member is attached to the frame 1 and then inserted into the insertion hole 3 b of the printed circuit board 3. The screw 4 is screwed to the female screw 5e of the stud member.

  In FIG. 10, a stud member with both female threads is used as the spacer 5, the fixing screw 4 that is passed through the insertion hole 1 c of the frame 1 is screwed to one female screw of the stud member, and the fixing screw that is passed through the insertion hole 3 b of the printed circuit board 3. 4 is screwed to the other female screw. In FIG. 11, a fixed bracket member bent into a crank shape is used as the spacer 5, and the printed board 3 is attached to a bracket member attached to the frame 1 by screwing or welding or the like by screwing a fixing screw 4 through an insertion hole 3 b. Attached.

  However, in the structure shown in FIGS. 7 to 11 described above, there is a problem that the number of parts is increased and the cost is increased because an extra spacer 5 must be used. Further, the structure shown in FIG. 7 may come off when an impact is applied, and the structure shown in FIG. 10 has a problem that the mounting direction of the two fixing screws 4 is reversed and workability is poor.

  Considering such a situation, in a conventional printed circuit board holding device, as shown in FIG. 12, a part of the sheet metal frame 1 is cut and bent into a crank shape to form a printed circuit board mounting portion 6. There is a type in which the printed circuit board 3 is overlapped on the tip of the printed circuit board mounting portion 6, and a fixing screw 4 is screwed to the printed circuit board mounting portion 6 through the insertion hole 3 b of the printed circuit board 3 to fix the printed circuit board 3 to the sheet metal frame 1. .

  Further, as shown in FIG. 13, a part of the sheet metal frame 1 is drawn to form a protrusion 7, the printed circuit board 3 is overlaid on the top of the protrusion 7, and the protrusion is projected through the insertion hole 3 b of the printed circuit board 3. There are some which fix the printed circuit board 3 to the sheet metal frame 1 by screwing the fixing screw 4 to the part 7. However, in the structure shown in FIG. 13, drilling and burring must be performed after the drawing process, and the number of processes is larger than in the structure shown in FIG. 12, and the flatness is maintained because the drawing process is performed. There is a problem that is difficult.

  Therefore, it is preferable to use the structure shown in FIG. 12 from the viewpoint of reducing the number of parts, improving workability, and reducing the number of processes. However, in the structure shown in FIG. 12, a finger or the like is inserted into the hole 8 formed in the sheet metal frame 1 by cutting and raising the printed board mounting portion 6 to contact the printed board 3 or the tip of the fixing screw 4. There was a risk of electric shock. For this reason, it is preferable to attach the cover member so as to close the hole 8.

  In a conventional printed circuit board holding device, for example, as shown in FIG. 14, a frame (chassis) 1 is formed of a metal material or a resin material subjected to electroless plating, and a protrusion 9 is provided on the frame 1. In addition, a spacer (substrate support) 5 subjected to electroless plating is attached to the protrusion 9, a printed board 3 is attached to the spacer 5, and the printed board 3 is attached to the frame 1 via the spacer 5 ( Patent Document 1).

Japanese Utility Model Publication No. 6-59617 JP 2001-203479 A

  However, if the frame is a sheet metal, it has not been possible to obtain a conventional structure as shown in FIG. In the structure shown in FIG. 14, the EMI structure for grounding the printed circuit board to the conductive frame is not reliable so as not to generate noise in the electric / electronic device.

  Accordingly, an object of the present invention is to use a sheet metal frame having a small number of parts and high EMI structure reliability, enabling assembly from one side of the sheet metal frame, excellent assembly workability, and holding a printed circuit board without fear of electric shock. It is to make it possible.

In order to achieve this object, the invention described in claim 1
A part of the plate surface is cut and raised on the back side and bent to open a hole, for example, a sheet metal frame formed with a crank type printed circuit board mounting portion,
A fixing screw that fixes the printed circuit board on the printed circuit board mounting part by screwing and fixing,
A cover member that is inserted between the printed board mounting portion and the plate surface on the back side of the sheet metal frame with the front side facing the sheet metal frame, and is attached to the back side of the sheet metal frame to close the hole .
Equipped with a,
The cover member is provided on the plate surface on the front side of the flat plate portion and fitted into the through hole, and is provided on the back side of the flat plate portion at a right angle to the plate surface and exposed to the front side of the plate surface of the sheet metal frame. And a non-through hole into which the tip of the fixing screw enters so as to restrict the movement of the cover member with the fixing screw .

According to a second aspect of the present invention, in the printed circuit board holding device according to the first aspect, a boss portion is provided on the back side of the flat plate portion of the cover member, and the non-through hole is formed in the boss portion. Features.

According to a third aspect of the present invention, in the printed circuit board holding device according to the first or second aspect, the cover member is pressed from above by the printed circuit board mounting portion, and the fitting portion is elastically formed by the punch hole. An elastic portion is provided which forms a snap-fit structure for fitting the cover member to the sheet metal frame by being fitted.

According to a fourth aspect of the present invention, in the printed circuit board holding device according to the third aspect, when the printed board is screwed and fixed to the printed board mounting portion with the fixing screw, the movement of the cover member is restricted. A non-through hole for inserting a tip of a fixing screw is provided in the cover member, and a difference between a length of the fixing screw actually inserted into the non-through hole and a depth of the non-through hole is L1, and the fitting portion When the fitting depth when L is fitted into the punched hole is L2,
L1 <L2
It is characterized by that.

  According to a fifth aspect of the present invention, in the printed circuit board holding device according to any one of the first to fourth aspects, when the printed circuit board is mounted on the printed circuit board mounting portion, the printed circuit board is applied to position the printed circuit board. A positioning protrusion is formed on the cover member.

In order to achieve the above-mentioned object, the invention according to claim 6 is characterized in that a hole formed in the sheet metal frame by cutting and raising a part of the sheet metal frame to the back side of the sheet surface is covered with a plate member of the sheet metal frame. Covering from the back side of the surface, by cutting and raising a part of the sheet metal frame to the back side of the plate surface, the printed circuit board is overlaid on the printed circuit board mounting portion formed on the sheet metal frame and fixed with screws, and the cover member By inserting the tip of the fixing screw into a non-through hole provided at a right angle to the plate surface on the back side of the flat plate portion , the fixing screw does not expose the tip of the fixing screw on the front side of the plate surface of the sheet metal frame. A method for holding a printed circuit board, wherein the movement of a cover member is restricted.

  According to the first aspect of the present invention, the printed circuit board mounting portion is formed by cutting and raising a part of the sheet metal frame, and the printed circuit board is overlaid on the printed circuit board mounting portion and fixed with screws. It is possible to prevent the circuit pattern on the plate surface from being short-circuited by floating and holding the part other than the screwing part of the substrate. In addition, the printed circuit board can be directly attached to the sheet metal frame without using a spacer, the printed circuit board can be fixed with a small number of parts, and the EMI structure for grounding the printed circuit board to the conductive frame can be ensured. it can.

  In addition, the printed circuit board is overlapped on the printed board mounting part formed by cutting and raising a part of the sheet metal frame to the back side of the board, and fixed with screws, and the printed board mounting part is cut and raised to make the sheet metal frame The cover hole is closed from the back side of the plate surface of the sheet metal frame using the cover member, so that the cover member is attached to the back side of the plate surface of the sheet metal frame, the printed board is attached, and the assembly from one side of the sheet metal frame is performed. The assembly workability can be enhanced as possible.

  In addition, since the movement of the cover member is restricted by a fixing screw for fixing the printed circuit board with screws, the movement of the cover member can also be restricted and the number of components can be reduced without using a dedicated screw. In addition, the tip of the fixing screw is not exposed on the front side of the plate surface of the sheet metal frame, the tip of the fixing screw is not projected on the front side of the plate surface, and the movement of the cover member is restricted to ensure the punched hole. The risk of electric shock can be reliably eliminated without closing and touching the printed board or touching the fixing screw by inserting a finger through the punched hole.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1 , a boss portion is provided on the back side of the flat plate portion of the cover member, and a non-through hole is formed in the boss portion. Without increasing the number of points, the movement of the cover member can be easily restricted with a fixing screw for fixing the printed circuit board with screws, so that the hole can be reliably closed.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the cover member is pressed from above with the printed board mounting portion, and the fitting portion is elastically fitted into the punched hole. By providing an elastic part that forms a snap-fit structure for attaching the cover member to the sheet metal frame, the cover member can be easily attached temporarily to the sheet metal frame to improve the workability of attaching and removing the cover member. Can do.

According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the cover member is provided with the non-through hole into which the tip of the fixing screw is inserted when the printed board is attached to the printed board attachment portion. Provided, when the difference between the length in which the fixing screw is actually inserted in the non-through hole and the depth of the non-through hole is L1, and the fitting depth when the fitting portion is fitted into the punched hole is L2,
L1 <L2
Therefore, even if the cover member is fully lifted by the difference L1 between the length in which the fixing screw is actually inserted into the non-through hole and the depth of the non-through hole, the fitting portion remains stuck in the hole. This state is maintained, and the fitting portion is not detached from the hole, and the hole can always be reliably closed with the cover member.

  According to invention of Claim 5, in addition to the effect of any one of Claim 1 thru | or 4, when attaching a printed circuit board to a printed circuit board attachment part, positioning which contacts a printed circuit board and positions a printed circuit board Since the protrusion is formed on the cover member, the printed circuit board can be easily positioned by being placed on the positioning protrusion, and the assembly workability can be improved by simplifying the mounting of the printed circuit board.

  According to the sixth aspect of the present invention, the printed circuit board is overlaid on the printed circuit board mounting portion of the sheet metal frame formed by cutting and raising a part, and is fixed with a fixing screw. The circuit pattern on the plate surface can be prevented from being short-circuited by being held in a floating state. In addition, the printed circuit board can be directly attached to the sheet metal frame without using a spacer, and the printed circuit board can be fixed with a small number of parts, and the EMI structure for grounding the printed circuit board to the conductive frame can be ensured. it can.

  In addition, a hole formed in the sheet metal frame by cutting a part of the sheet metal frame to the back side of the sheet surface is closed from the back side of the sheet surface of the sheet metal frame by using a cover member, and a part of the sheet metal frame is sheeted. The printed circuit board is overlapped on the printed circuit board mounting part formed on the sheet metal frame by cutting it up on the back side of the surface, and fixed with screws, so the cover member is attached to the back side of the surface of the sheet metal frame and the printed circuit board is attached. The assembly workability can be improved by enabling assembly from one side of the sheet metal frame.

  In addition, since the movement of the cover member is restricted by a fixing screw for fixing the printed circuit board with screws, the movement of the cover member can also be restricted and the number of components can be reduced without using a dedicated screw. In addition, the tip of the fixing screw is not exposed on the front side of the plate surface of the sheet metal frame, the tip of the fixing screw is not protruded on the front side of the plate surface, and the movement of the cover member is regulated to ensure the punch hole. The risk of electric shock can be reliably eliminated without closing and touching the printed board or touching the fixing screw by inserting a finger through the punched hole.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a sheet metal frame used in the present invention.

  A sheet metal frame indicated by reference numeral 10 in the drawing is partially cut and raised on the back side of the plate surface and bent into a crank shape as shown in the figure to form a printed circuit board mounting portion 12. The printed board mounting portion 12 is provided with a thick portion 13 at the tip, and a female screw hole 14 is provided through the front and back of the thick portion 13. In addition, the sheet metal frame 10 is formed with a rectangular punching hole 15 by cutting and raising the printed circuit board mounting portion 12.

FIG. 2 shows a cover member used in the present invention.
The cover member indicated by reference numeral 20 in the figure has a fitting portion 22 on the front side of the flat plate portion 21 and a boss portion 23, an elastic portion 24, and a positioning projection 25 on the back side.

  The flat plate portion 21 has a rectangular shape and has a square cut portion 26 on one short side. And the level | step difference 27 is provided in the circumference | surroundings of the surface, and it protrudes in a rectangular shape on the surface, and the fitting part 22 is formed. Here, the step 27 has a thickness D slightly thinner than the thickness of the sheet metal frame 10, and the fitting portion 22 has a shape that fits into the punched hole 15 of the sheet metal frame 10. The boss portion 23 is located slightly inside the bottom of the cut portion 26 and is provided so as to protrude from the back surface of the flat plate portion 21. A non-through hole 28 is formed in the center of the boss portion 23 from the top surface.

  The elastic portion 24 is formed by being bent from a right angle so as to rise from the bottom edge of the cut portion 26 and to be substantially parallel to the flat plate portion 21. An opening 29 is provided in a portion facing the top surface of the boss portion 23. Further, the positioning protrusions 25 are formed so as to stand higher than the elastic part 24 on both sides of the notch part 26.

  In FIG. 3, the state which attaches such a cover member 20 to the sheet-metal frame 10 mentioned above is shown.

  When the printed circuit board is held by the sheet metal frame 10, first, as shown in FIG. 3, the cover member 20 is inserted from the back side of the plate surface of the sheet metal frame 10 with the front side of the cover member 20 facing the sheet metal frame 10. It is also pushed under the part 12. Then, the printed circuit board mounting portion 12 is inserted into the cut portion 26 of the cover member 20, the thick portion 13 of the printed circuit board mounting portion 12 is inserted into the opening 29 of the elastic portion 24, and the elastic portion 24 is moved upward from the printed circuit board mounting portion 12. After a while, the fitting portion 22 is fitted into the punching hole 15 to close the punching hole 15 of the sheet metal frame 10 from the back side of the plate surface of the sheet metal frame 10. Then, the non-through hole 28 formed in the boss portion 23 is located at a position that matches the female screw hole 14 of the printed board mounting portion 12.

  In this manner, the snap fit structure for attaching the cover member 20 to the sheet metal frame 10 is formed by elastically fitting the fitting portion 22 of the cover member 20 into the hole 15, and the cover member 20 is fitted to the sheet metal frame 10. The cover member 20 can be attached temporarily and temporarily, and the workability of attaching and removing the cover member 20 can be improved. Even if the sheet metal frame 10 is in an oblique state, it is possible to prevent the cover member 20 that has been temporarily fixed from falling.

FIG. 4 shows a state after the cover member 20 is attached to the sheet metal frame 10.
After the cover member 20 is fitted and temporarily fixed to the sheet metal frame 10, the printed circuit board 30 is overlaid on the printed circuit board mounting portion 12 of the sheet metal frame 10, and the printed circuit board 30 is pressed against the positioning protrusion 25 to be positioned, The screw insertion hole 31 of the printed board 30 is aligned with the female screw hole 14 of the printed board mounting portion 12.

  Thereafter, the fixing screw 40 is passed through the screw insertion hole 31 of the printed circuit board mounting portion 12 and screwed into the female screw hole 14 of the printed circuit board mounting portion 12 to fix the printed circuit board 30 to the printed circuit board mounting portion 12 with screws. At this time, the tip of the fixing screw 40 is put into a non-through hole 28 formed in the boss portion 23 of the cover member 20 through the opening 29 of the elastic portion 24, and the tip of the fixing screw 40 is exposed on the front side of the plate surface of the sheet metal frame 10. Without movement, the movement of the cover member 20 is restricted by the fixing screw 40.

  FIG. 5 shows a state in which the printed board 30 is screwed and fixed to the printed board mounting portion 12 with the fixing screw 40.

  As a result, the printed circuit board mounting portion 12 is formed by cutting and raising a part of the sheet metal frame 10, and the printed circuit board 30 is overlaid on the printed circuit board mounting portion 12 and fixed with the fixing screws 40. It is possible to prevent the circuit pattern of the printed circuit board 30 from being short-circuited by floating and holding the parts other than the screwing portion. In addition, the printed circuit board 30 can be directly attached to the sheet metal frame 10 without using a spacer, and the printed circuit board 30 can be fixed with a small number of components, and the EMI structure for grounding the printed circuit board 30 to the conductive frame is ensured. It can be.

  In addition, the printed circuit board 30 is overlaid on the printed circuit board mounting portion 12 formed by cutting and raising a part of the sheet metal frame 10 on the back side of the plate surface, and fixed with screws 40, and the printed circuit board mounting portion 12 is cut. Since the hole 15 formed in the sheet metal frame 10 by waking up is closed from the back side of the plate surface of the sheet metal frame 10 using the cover member 20, the cover member 20 is attached to the back side of the plate surface of the sheet metal frame 10, and the printed circuit board 30 can be attached to allow assembly from one side of the sheet metal frame 10 to improve the assembly workability.

  In addition, since the movement of the cover member 20 is restricted by the fixing screw 40 that fixes the printed circuit board 30 by screwing, the movement of the cover member 20 is also restricted without using a dedicated screw, and the number of parts can be reduced. Can do. In addition, the front end of the fixing screw 40 is not exposed on the front side of the plate surface of the sheet metal frame 10, the front end of the fixing screw 40 is not projected on the front side of the plate surface, and the movement of the cover member 20 is regulated and removed. It is possible to reliably eliminate the risk of electric shock without blocking the hole 15 and inserting a finger from the hole 15 to touch the printed circuit board 30 or the fixing screw 40.

  Further, a non-through hole 28 is provided in the cover member 20, and when the printed board 30 is screwed and fixed to the printed board mounting portion 12 with the fixing screw 40, the tip of the fixing screw 40 is placed at the non-through hole to restrict the movement of the cover member 20. 28, the movement of the cover member 20 can be easily restricted by the fixing screw 40 for fixing the printed circuit board 30 by screwing without increasing the number of components, so that the hole 15 can be reliably closed.

By the way, in the above-described example, the difference between the length in which the fixing screw 40 is actually inserted into the non-through hole 28 and the depth of the non-through hole 28 is L1, and the fitting when the fitting portion 22 is fitted into the hole 15 is made. When the combined depth is L2,
L1 <L2
And That is, in this example, the fitting depth L2 is the thickness D of the step 27. In this way, even if the cover member 20 rises most by the difference L1 between the length in which the fixing screw 40 is actually inserted into the non-through hole 28 and the depth of the non-through hole 28, the fitting portion 22 is still removed. Since the state of being fitted in the hole 15 is maintained, the fitting portion 22 is not detached from the punch hole 15 and the cover member 20 can always reliably block the punch hole 15.

  Further, in the above-described example, when the printed circuit board 30 is attached to the printed circuit board attachment portion 12, the printed circuit board 30 is overlapped with the printed circuit board attachment portion 12 of the sheet metal frame 10, and the printed circuit board 30 is applied to the positioning protrusion 25. Although the positioning in the arrow direction a in FIG. 5 is performed, the positioning is not limited to the arrow direction a but may be in the direction orthogonal thereto, or both the arrow direction a and the direction orthogonal thereto may be positioned.

  As described above, when the printed circuit board 30 is attached to the printed circuit board mounting portion 12, the positioning projection 25 for positioning the printed circuit board 30 by applying the printed circuit board 30 is formed on the cover member 20. The positioning of the board 30 can be facilitated, the mounting of the printed board 30 can be simplified, and the assembly workability can be improved.

  In the above-described example, only the holding structure of one corner of the printed circuit board 30 has been described. However, other corner portions may be held in the same manner. At that time, the positioning protrusions 25 are also provided in the other corners. If provided, the printed circuit board 30 can be more reliably positioned by the mutual positioning protrusions 25. Of course, not only the corner of the printed circuit board 30 but also an intermediate position can be maintained.

It is a top view, sectional view, and bottom view of a sheet metal frame used in the present invention from above. It is the top view, side view, and bottom view of the cover member used by this invention from the top. It is a figure which shows the state which attaches the cover member shown in FIG. 2 to the sheet-metal frame shown in FIG. It is a figure which shows the state after attaching a cover member to a sheet metal frame. It is a figure which shows the state which attached the printed circuit board to the sheet metal frame. It is the conventional figure which attaches to the boss | hub part formed in the flame | frame and hold | maintains a printed circuit board. It is a prior art figure which attaches a snap fitting member to a sheet metal frame as a spacer, and holds a printed circuit board. It is a prior art figure which attaches a color member to a sheet metal frame as a spacer, and holds a printed circuit board. It is a conventional figure which attaches a stud member with a male and female thread to a sheet metal frame as a spacer, and holds a printed circuit board. It is a prior art figure which attaches a member with both female threads to a sheet metal frame as a spacer, and holds a printed circuit board. It is a prior art figure which attaches a fixed bracket member to a sheet metal frame as a spacer, and holds a printed circuit board. It is a conventional figure which attaches to the printed circuit board attachment part formed by cutting and raising a part of sheet metal frame, and hold | maintains a printed circuit board. It is a conventional figure which attaches to the protrusion formed by drawing a part of sheet-metal frame, and hold | maintains a printed circuit board. It is a conventional figure which attaches to a sheet metal frame using the spacer which gave electroless plating, and hold | maintains a printed circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sheet metal frame 12 Printed circuit board attaching part 13 Thick part 14 Female screw hole 15 Extraction hole 20 Cover member 21 Flat plate part 22 Fitting part 23 Boss part 24 Elastic part 25 Positioning protrusion 26 Cut part 27 Step 28 Non-through hole 29 Opening 30 Printed circuit board 40 Fixing screw

Claims (6)

By cutting and raising a part on the back side of the plate surface , a punching hole is made and a sheet metal frame on which a printed board mounting part is formed,
A fixing screw for fixing the printed circuit board by superimposing the printed circuit board on the printed circuit board mounting portion and screwing it;
A cover member that is inserted between the printed board mounting portion and the plate surface on the back side of the sheet metal frame with the front side facing the sheet metal frame, and is attached to the back side of the sheet metal frame to close the hole .
Equipped with a,
The cover member is provided on the plate surface on the front side of the flat plate portion and fitted into the through hole, and is provided on the back side of the flat plate portion at a right angle to the plate surface and exposed to the front side of the plate surface of the sheet metal frame. And a non-through hole into which the tip of the fixing screw enters so as to restrict the movement of the cover member with the fixing screw . The printed board holding device according to claim 1 , wherein a boss portion is provided on a back side of the flat plate portion of the cover member, and the non-through hole is formed in the boss portion . The cover member is provided with an elastic portion that forms a snap-fit structure for attaching the cover member to the sheet metal frame by pressing the printed circuit board attachment portion from above and elastically fitting the fitting portion into the punch hole. The printed circuit board holding device according to claim 1, wherein: A non-through hole is provided in the cover member for inserting the tip of the fixing screw to restrict the movement of the cover member when the printed board is screwed and fixed to the printed board mounting portion with the fixing screw. When the difference between the length of actually inserting the fixing screw and the depth of the non-through hole is L1, and the fitting depth when the fitting portion is fitted into the punched hole is L2,
L1 <L2
The printed circuit board holding device according to claim 3, wherein:   5. The printed circuit board according to claim 1, wherein when the printed circuit board is attached to the printed circuit board mounting portion, a positioning protrusion for positioning the printed circuit board by contacting the printed circuit board is formed on the cover member. Holding device. Closing a hole formed in the sheet metal frame by cutting and raising a part of the sheet metal frame from the back side of the sheet surface from the back side of the sheet surface of the sheet metal frame with a cover member;
The printed board is overlaid on the printed board mounting part formed on the sheet metal frame by cutting and raising a part of the sheet metal frame to the back side of the plate surface, and fixed with screws with fixing screws,
By inserting the tip of the fixing screw into a non-through hole provided at a right angle to the plate surface on the back side of the flat plate portion of the cover member, without exposing the tip of the fixing screw on the front side of the plate surface of the sheet metal frame , Restricting the movement of the cover member with a fixing screw;
A method of holding a printed circuit board.

Images