JP2008294025A - Structure for mounting and fixing substrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for mounting and fixing a substrate which can mount and fix two upper and lower substrates in a housing made of iron plates only by a housing component having a planar part and a boss, can mount and fix the two upper and lower substrates with two screws, can reduce the number of components to reduce a cost and also can reduce working processes of screwing, can save a space as a large space for the substrate is not required, can prevent the housing component from shaking when mounting the component and can improve workability. <P>SOLUTION: A swell 1a is formed on the bottom of the housing (chassis) 1 made of iron plates. A lower substrate 2 is provided on the upper surface of the swell, and the housing component 3 comprising the boss 3a and the planar part 3b is provided on the surface of the substrate. The housing component, the lower substrate and the swell on the bottom of the housing are fixedly installed with the screw 4. An upper substrate 5 is fixedly installed at the upper end of the boss of the housing component with the screw 4. A downward hook 3c at the tip of the planar part of the housing component is fitted into a notched recess 2a at an edge of the lower substrate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a substrate mounting structure in which two upper and lower substrates are mounted inside a casing made of an iron plate.

  As shown in FIG. 4, in the conventional board mounting and fixing structure, two raised portions 101a and 101b are provided at the bottom of a casing 101 made of an iron plate, and the lower substrate 102 is screwed on one raised portion 101a. 103, the housing component 104 including the flat plate portion 104a and the boss portion 104b is attached and fixed to the other raised portion 101b with the screw 103, and the upper substrate 105 is attached to the upper end of the boss portion 104b with the screw 103. It was fixed. However, in this case, since three screws 103 are required, the number of parts is increased and the cost is increased, and since the screw fixing work is required three times, the number of work steps is increased, and the casing is made of an iron plate. There is a problem that the cost increases because two raised portions 101a and 101b must be provided on the 101.

  The first prior art is shown in FIG. As shown in FIG. 5, this conventional heat sink mounting structure is in contact with a heat generating electronic component 203 mounted substantially upright in the vicinity of the peripheral edge 202b on the one surface 202a side of the printed circuit board 202, and also on the printed circuit board 202. A flat plate heat dissipating part 201a disposed substantially along the peripheral edge 202b, and formed on the printed circuit board 202 side of the heat dissipating part 201a and in contact with one surface 202a of the printed circuit board 202, is printed by one mounting screw 204 In the mounting structure of the heat radiating plate 201 including the mounting portion 201 c fixed to the substrate 202, the heat radiating plate 201 protrudes from the one surface 202 a side of the printed circuit board 202 to the other surface 202 c side of the heat radiating plate 201. Protrusion 20 that abuts against peripheral edge 202b of printed circuit board 202 in the tightening rotation direction and prevents rotation of heat radiating portion 201a. It provided with an e. (For example, refer to Patent Document 1).

However, in this case, since it is necessary to provide the protruding portion 201e for preventing the rotation of the heat radiating plate 201 at a position away from the position where the heat radiating plate 201 is attached by the mounting screw 204, a large space is required for the printed circuit board 202. There was a problem to do. Further, this was not a structure in which the upper and lower two substrates were mounted and fixed in the casing.
JP-A-8-181473

  The present invention has been made in view of the above-described conventional problems, and it is possible to mount and fix two upper and lower substrates in a casing made of an iron plate only by a casing component having a flat plate portion and a boss portion, In addition, the two upper and lower boards can be mounted and fixed with two screws, the number of parts can be reduced, the cost can be reduced, and the work process of screw fixing work can be reduced. Provided is a board mounting and fixing structure that can save space without requiring a large space and can prevent wobbling of the casing parts when mounting the casing parts, thereby improving workability. The purpose is that.

  The present invention has been proposed in order to solve the above-mentioned problems, and the invention according to claim 1 is directed to mounting a substrate in which two substrates, upper and lower, are mounted inside a casing made of an iron plate. In the structure, a raised portion is formed at the bottom of the casing made of the iron plate, a lower substrate is arranged on the upper surface of the raised portion, and a casing component consisting of a boss portion and a flat plate portion is arranged on the surface of the substrate. The casing component, the lower substrate, and the raised portion at the bottom of the casing are attached and fixed with screws, and the upper substrate is attached and fixed to the upper end of the boss portion of the casing component with screws. It is characterized by being.

  According to a second aspect of the present invention, in the first aspect of the invention, a downward hook is provided at the tip of the flat plate portion of the casing component, and a notch recess is provided at the edge of the lower substrate. A downward hook of the casing component is inserted into the notch recess of the lower substrate, and the casing component is attached to the lower substrate and the raised portion of the bottom portion of the casing with a screw. The case parts are prevented from wobbling.

  According to a third aspect of the present invention, in the first aspect of the invention, a downward hook is provided at the tip of the flat plate portion of the casing component, and a hook insertion hole is formed in the lower substrate. The downward hook of the flat plate portion of the casing component is engaged with the hook insertion hole of the lower substrate, and the casing component is attached to the lower substrate and the raised portion of the bottom portion of the casing with screws. At this time, the housing parts are prevented from wobbling.

  According to the first aspect of the present invention, the lower substrate is attached and fixed to the raised portion at the bottom of the casing with the casing component composed of the boss portion and the flat plate portion, and the boss portion of the casing component is fixed. Since the upper substrate is attached and fixed to the upper end with screws, the upper and lower two substrates can be attached and fixed in the casing made of iron plate only by the casing component having the boss portion and the flat plate portion. Therefore, it is possible to mount and fix the two upper and lower substrates with two screws and to provide only one raised portion at the bottom of the casing made of iron plate, reducing the number of parts and reducing the cost. Can be achieved. Furthermore, space saving can be achieved without requiring a large space for the substrate.

  According to the second aspect of the present invention, since the downward hook at the front end of the flat plate portion of the casing component is inserted into the notch recess of the lower substrate and the casing component is attached and fixed with the screw, This can prevent wobbling of the casing parts when attaching the bracket, thereby improving workability and preventing the positional deviation of the casing parts after screwing.

  According to the invention described in claim 3, since the downward hook of the tip of the flat plate portion of the casing component is engaged with the hook insertion hole of the lower substrate, the casing component is attached and fixed with a screw. When mounting the casing part, the wobbling of the casing part can be prevented and workability can be improved, and the positional deviation of the casing part after screwing can be prevented.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a substrate fixing structure according to the present invention will be described below with reference to the drawings. In the following embodiments, a chassis is described as a casing made of an iron plate, but the present invention can also be applied to a casing other than the chassis.

  1A and 1B show a mounting and fixing structure of a substrate according to a first embodiment of the present invention. FIG. 1A is a partial plan view thereof, and FIG. 1B is a partial vertical sectional view thereof.

  As shown in FIGS. 1 (a) and 1 (b), the substrate mounting and fixing structure of the first embodiment has a lower substrate 2 arranged on a raised portion 1a of a chassis 1 made of an iron plate, and this lower substrate. A housing part 3 composed of a boss part 3 a and a flat plate part 3 b is arranged on the surface of the board 2, and the flat plate part 3 b of the housing part 3 is attached to the lower substrate 2 and the raised part 1 a of the chassis 1 by screws 4. It is fixed. The casing component 3 is provided with a downward hook 3c that contacts the edge of the lower substrate 2 at the tip thereof. Further, a screw hole 3 d is formed at the upper end of the casing component 3, and the upper substrate 5 is attached and fixed to the upper end of the casing component 3 by a screw 4.

  Therefore, according to the second embodiment, the lower substrate 2 is attached and fixed to the raised portion 1a at the bottom of the casing by the casing component 3 composed of the boss portion 3a and the flat plate portion 3b, and the casing is fixed. Since the upper substrate 5 is attached and fixed to the upper end of the boss portion 3a of the body part 3 with the screws 4, the casing part 3 having the boss part 3a and the flat plate part 3b can be moved up and down in the chassis 1 made of an iron plate. Two substrates 2 and 5 can be attached and fixed. Accordingly, the upper and lower two substrates 2 and 5 can be mounted and fixed by the two screws 4, and only one raised portion 1a is provided at the bottom of the chassis 1 made of an iron plate, thereby reducing the number of parts. Can reduce costs. Furthermore, space saving can be achieved without requiring a large space for the lower substrate 2.

  2A and 2B show a mounting and fixing structure of a substrate according to the second embodiment, wherein FIG. 2A is a partial plan view thereof, and FIG. 2B is a partial vertical sectional view thereof. In addition, the same code | symbol is attached | subjected to the same member and the same location as above-mentioned 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 2A and 2B, the board mounting and fixing structure of the second embodiment is such that the downward hook 3c at the tip of the flat plate portion 3b of the housing component 3 is connected to the edge of the lower substrate 2. Is inserted into the notch recess 2a. In this state, the flat plate portion 3 b of the housing component 3 and the lower substrate 2 are attached and fixed to the raised portion 1 a at the bottom of the chassis 1 with screws 4. Therefore, according to the second embodiment, the downward hook 3c at the tip of the flat plate portion 3b of the housing component 3 is engaged with the cutout recess 2a of the lower substrate 2, and the housing component 3 is attached with the screw 4. Since it is fixed, it is possible to prevent wobbling of the casing part 3 when the casing part 3 is attached, to improve workability, and to prevent displacement of the casing part 3 after screwing. .

  3A and 3B show a mounting and fixing structure of a substrate according to the third embodiment, wherein FIG. 3A is a partial plan view thereof, and FIG. 3B is a partial vertical sectional view thereof. In addition, the same code | symbol is attached | subjected to the same member and the same location as above-mentioned 1st Embodiment, and the description is abbreviate | omitted.

  In the substrate mounting and fixing structure of the third embodiment, as shown in FIGS. 3A and 3B, the downward hook 3 c at the tip of the flat plate portion 3 b of the housing component 3 is formed on the lower substrate 2. The hook is inserted into the hook insertion hole 2b. In this state, the flat plate portion 3 b of the housing component 3 and the lower substrate 2 are attached and fixed to the raised portion 1 a at the bottom of the chassis 1 with screws 4. Therefore, according to the third embodiment, the casing component 3 is screwed in the state in which the downward hook 3c at the tip of the flat plate portion 3b of the casing component 3 is engaged with the hook insertion hole 2b of the lower substrate 2. 4, when mounting the housing part 3, it is possible to prevent wobbling of the housing part 3 and to improve workability and to prevent the positional displacement of the housing part 3 after the screw 4 is fixed. I can prevent it.

The board | substrate attachment fixing structure of 1st Embodiment of this invention is shown, (a) is the fragmentary top view, (b) is the fragmentary longitudinal cross-sectional view. The board | substrate attachment fixing structure of 2nd Embodiment is shown, (a) is the fragmentary top view, (b) is the fragmentary longitudinal cross-sectional view. The attachment fixing structure of the board | substrate of 3rd Embodiment is shown, (a) is the fragmentary top view, (b) is the fragmentary longitudinal cross-sectional view. It is a fragmentary longitudinal cross-section which shows the conventional attachment fixing structure of a board | substrate. It is a perspective view which shows the attachment structure of the conventional heat sink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis 1a which consists of iron plates Raised part 2 Lower board | substrate 2a Notch recessed part 2b Hook insertion hole 3 Housing | casing component 3a Boss part 3b Flat plate part 3c Downward hook 3d Screw hole 4 Screw 5 Upper board

Claims (3)

  In a substrate mounting structure in which two upper and lower substrates are mounted inside a casing made of iron plate, a raised portion is formed at the bottom of the casing made of iron plate, and a lower substrate is formed on the upper surface of the raised portion. Is disposed on the surface of the substrate, and the housing component, the lower substrate, and the raised portion at the bottom of the housing are fixed by screws. And an upper substrate is fixedly attached to the upper end of the boss portion of the casing component with a screw.   A downward hook is provided at the front end of the flat plate portion of the casing component, a notch recess is provided in an edge portion of the lower substrate, and the casing component is directed downward in the notch recess of the lower substrate. 2. The substrate according to claim 1, wherein a hook is engaged to prevent the housing component from wobbling when the housing component is attached to the lower substrate and the raised portion of the bottom of the housing with a screw. Mounting fixing structure.   A downward hook is provided at the tip of the flat plate portion of the casing component, a hook insertion hole is formed in the lower substrate, and the downward hook of the flat plate portion of the casing component is formed on the lower substrate. 2. The device according to claim 1, wherein the housing component is inserted into a hook insertion hole to prevent the housing component from wobbling when the housing component is attached to the lower substrate and the raised portion of the bottom of the housing with a screw. Mounting and fixing structure of the described board.