Circuit module and projection display device

Abstract

This invention provides a circuit module and a projection display device. The circuit module can prevent dust from entering the housing containing the circuit board. The circuit module includes a circuit board unit (2) and a housing (3) housing the circuit board unit. The housing includes: a housing body (31) having a housing space (S) opening in a predetermined direction to house the circuit board unit; a cover covering the opening (31A) of the housing body; and side members (33) mounted on the inner surface of the housing body. The housing body includes: a base plate portion, which is polygonal in shape when viewed from above; and a plurality of side plate portions (36) that extend from each side of the base plate portion toward one side in the thickness direction of the base plate portion by bending relative to each side of the base plate portion, thereby forming the opening of the housing body. The side members are arranged to overlap at least with the inner surface of the adjacent side plate portions, thereby covering the gap (G1) between adjacent side plate portions.

Description

Technical Field

[0001] This utility model relates to a circuit module and a projection-type display device. Background Technology

[0002] Patent Document 1 discloses a circuit module (control circuit module) obtained by encapsulating a circuit board unit (control circuit board) on a circuit board, which houses various electrical components, with insulating resin. In the circuit module of Patent Document 1, the insulating resin protects the circuit board unit from dust, corrosive gases, and the like.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2006-121861 Utility Model Content

[0006] The problem to be solved by the utility model

[0007] However, in circuit modules, sometimes the circuit board units are not encased in resin but rather housed in a housing. However, by simply housing the circuit board units unconditionally, dust can potentially enter the interior through gaps in the housing.

[0008] This invention was made in view of the above circumstances, and its purpose is to provide a circuit module capable of suppressing the intrusion of dust into the housing containing the circuit board unit, and a projection display device having the circuit module.

[0009] Methods for solving problems

[0010] One embodiment of this utility model is a circuit module comprising a circuit board unit and a housing housing the circuit board unit. The housing includes a housing body, a cover, and side members. The housing body has a receiving space that opens in a predetermined direction to receive the circuit board unit. The cover covers the opening of the housing body, and the side members are mounted on the inner surface of the housing body. The housing body has a base plate portion and a plurality of side plate portions. The base plate portion is polygonal in shape when viewed from above. The plurality of side plate portions extend from each side of the base plate portion toward one side in the thickness direction of the base plate portion by bending relative to each side of the base plate portion, thereby forming the opening of the housing body. The side members are configured to overlap at least with the inner surface of adjacent side plate portions, thereby covering the gap between adjacent side plate portions.

[0011] Another aspect of this utility model is a projection-type display device incorporating the aforementioned circuit module.

[0012] Utility Model Effect

[0013] According to this invention, in a circuit module, it is possible to prevent dust from entering the housing containing the circuit board. Attached Figure Description

[0014] Figure 1 This is a perspective view showing the appearance of a circuit module according to one embodiment of the present invention.

[0015] Figure 2 yes Figure 1 A cross-sectional view of the circuit module.

[0016] Figure 3 It means from Figure 1 A 3D view of the circuit module with the cover removed.

[0017] Figure 4 Viewed from above Figure 3 A top view of the structure.

[0018] Figure 5 It constitutes Figure 1 , Figure 2 An exploded perspective view of the casing of the circuit module.

[0019] Figure 6 It is an enlarged representation Figure 3 A 3D view of area VI.

[0020] Figure 7 It is an enlarged representation Figure 4 Top view of area VII.

[0021] Figure 8 This means that in Figure 1 , Figure 2 A three-dimensional diagram showing how the cover is installed on the main body of the housing by means of threaded fastening in the circuit module.

[0022] Figure 9 It continues Figure 8 A three-dimensional diagram illustrating the installation method of the cover.

[0023] Figure 10 It continues Figure 9 A three-dimensional diagram illustrating the installation method of the cover.

[0024] Label Explanation

[0025] 1 Circuit Module

[0026] 2 Circuit board unit

[0027] 3. Shell

[0028] 5. Divide the components

[0029] 6. Heat dissipation components

[0030] 21 Circuit board

[0031] 22 External connection terminals

[0032] 24 Heating Components

[0033] 31. Main body of the shell

[0034] 31A Opening of the housing body 31

[0035] 32. Cover

[0036] 33 Side components

[0037] 34-terminal opening

[0038] 35. Base plate section

[0039] 36 Side panel section

[0040] 37 Top wall part

[0041] 38. Perimeter of the wall

[0042] 331 First Board Section

[0043] 332 Second Plate Section

[0044] 333 Third Board Section

[0045] 361 Bending Sheet

[0046] 362 Through Hole

[0047] 363 Cutting Line

[0048] G1 gap

[0049] S containment space

[0050] S1 First Area

[0051] S2 Second Area Detailed Implementation

[0052] The following is for reference Figures 1-10 The embodiments of this utility model will be described. In the following description, expressions such as "parallel," "orthogonal," and "center," which indicate relative or absolute configurations, not only strictly indicate such configurations, but also indicate a state of relative displacement by angle or distance with tolerances, to the extent that the same function can be obtained.

[0053] In the accompanying drawings of this embodiment, the direction indicated by the reference numeral Z corresponds to the height or thickness direction of the circuit module described below. In the following description, it is sometimes referred to as the Z-direction. Additionally, the side in which the arrow in the Z-direction points (the +Z side) is sometimes referred to as the "upper side." Furthermore, the side opposite to the side in which the arrow in the Z-direction points (the -Z side) is sometimes referred to as the "lower side." Moreover, "upper side" and "lower side" are merely names used to describe the relative positional relationships of the various parts; the actual arrangement relationships may be other than those indicated by these names.

[0054] Additionally, the direction indicated by the label X is a straight line orthogonal to the Z direction, corresponding to the width (or lateral) direction of the circuit module. In the following description, it is sometimes referred to as the X direction. Furthermore, the side in which the arrow in the X direction points (+X side) is designated as "one side of the X direction," and the side opposite to the side in which the arrow in the X direction points (-X side) is designated as "the other side of the X direction."

[0055] Additionally, the direction indicated by the label Y is a straight line orthogonal to the Z and X directions, corresponding to the depth (or longitudinal direction) of the circuit module. In the following description, it is sometimes referred to as the Y direction. Furthermore, the side in which the arrow in the Y direction points (+Y side) is designated as "one side of the Y direction," and the side opposite to the side in which the arrow in the Y direction points (-Y side) is designated as "the other side of the Y direction."

[0056] like Figure 1 , Figure 2 As shown, the circuit module 1 of this embodiment includes a circuit board unit 2 and a housing 3 that houses the circuit board unit 2.

[0057] like Figures 2-4 As shown, the circuit board unit 2 includes a circuit board 21, an external connection terminal 22 mounted on the circuit board 21, and a plurality of electrical components 23 mounted on the circuit board 21 to form the circuit of the circuit board unit 2.

[0058] The top view shape of the circuit board 21 can be arbitrary. In this embodiment, the circuit board 21 is formed into a top view rectangular shape with the X direction as the short side and the Y direction as the long side.

[0059] External connection terminal 22 is a terminal used to electrically connect the circuit of circuit board unit 2 to other components or units. Cables extending to other components or units are connected to external connection terminal 22. External connection terminal 22 may be, for example, an input terminal for inputting power or signals to circuit board unit 2, or an output terminal for outputting power or signals from circuit board unit 2 to other components or units.

[0060] In this embodiment, external connection terminals 22 are mounted on the first surface 21a of the circuit board 21 facing upwards. Furthermore, a plurality of external connection terminals 22 are mounted on the circuit board 21. Each of the plurality of external connection terminals 22 has: a first connection terminal 22A disposed on a first end of the circuit board 21, which is rectangular in plan view, located on one side (+X side) in the X direction; and two second connection terminals 22B disposed on a second end of the circuit board 21 located on the side opposite to the first end (-X side) in the X direction. In the example shown, there is one first connection terminal 22A and two second connection terminals 22B. The two second connection terminals 22B are arranged at intervals in the Y direction.

[0061] like Figure 2 As shown, the electrical component 23 has a first electrical component 23A mounted on a first surface 21a of the circuit board 21 and a second electrical component 23B mounted on a second surface 21b of the circuit board 21 facing downward. A portion of the first electrical component 23A and the second electrical component 23B are heated by a heating component 24 that generates heat when energized.

[0062] like Figure 1 , Figure 2 , Figure 5 As shown, the shell 3 has a shell body 31, a cover 32 and side members 33.

[0063] like Figure 2 , Figure 5 As shown, the housing body 31 is formed into a box shape with an upward opening (+Z direction; a specified direction). The housing body 31 has a housing space S for housing the circuit board unit 2.

[0064] The main body 31 of the housing is made of a sheet material that can be bent. The sheet material constituting the main body 31 can be conductive, such as metal, or electrically insulating, such as ordinary resin.

[0065] The main body 31 of the housing has a bottom plate portion 35 and multiple side plate portions 36.

[0066] The base plate portion 35 is formed as a plate with the Z-direction as its thickness direction. The base plate portion 35 may be formed to be at least polygonal in shape when viewed from above. In this embodiment, the base plate portion 35 is formed as a rectangular shape that corresponds to the top view shape of the circuit board 21. In addition, the size of the base plate portion 35 when viewed from above corresponds to the size of the circuit board 21.

[0067] like Figure 5As shown, a plurality of support bosses 351 for supporting the circuit board 21 are provided on the upper surface of the bottom plate portion 35 (the bottom surface of the housing body 31) facing upward. The plurality of support bosses 351 support the circuit board 21 from below by being spaced apart from the circuit board 21 and located on the upper side of the bottom plate portion 35. In addition, the plurality of support bosses 351 have internal threads 352, which can fix the circuit board 21 to the upper end of the plurality of support bosses 351 by thread fastening. In this embodiment, the support bosses 351 are arranged at the four corners of the bottom plate portion 35, which is rectangular in shape when viewed from above, but are not limited thereto.

[0068] Multiple side plate portions 36 are bent relative to each side of the base plate portion 35, thereby extending upward (in the +Z direction; one side in the thickness direction) from each side of the base plate portion 35 to form an opening 31A in the housing body 31. As a result, a gap G1 is created between adjacent side plate portions 36.

[0069] In this embodiment, the base plate portion 35 is formed into a rectangular shape when viewed from above, therefore the number of side plate portions 36 is four. The four side plate portions 36 have two first side plate portions 36A and two second side plate portions 36B. The two first side plate portions 36A are arranged at intervals in the X direction and extend in the Y direction, respectively. The two second side plate portions 36B are arranged at intervals in the Y direction and extend in the X direction, respectively.

[0070] The two second side plate portions 36B each have a bent piece 361 and a through hole 362.

[0071] The bending piece 361 is constructed by bending the portion of the second side plate portion 36B surrounded by the cutting line 363 relative to the other portions of the second side plate portion 36B toward the outside of the housing body 31. In the illustrated example, the cutting line 363 formed on the second side plate portion 36B is formed in the shape of the Japanese kana "コ" protruding upward. Furthermore, the portion of the second side plate portion 36B surrounded by the cutting line 363 is bent toward the lower side (-Z side) relative to the other portions of the second side plate portion 36B, thereby forming the bending piece 361.

[0072] Two bent tabs 361 are formed in each of the second side plate portions 36B along the X direction. In this embodiment, the four bent tabs 361 function as sheet metal portions for fixing the housing 3 to other components. For example, by passing screws through the bent tabs 361 while these bent tabs 361 overlap with other components, the housing 3 can be fixed to other components by threaded fastening. The number and formation position of the bent tabs 361 are not limited to the case shown in the figure. The bent tabs 361 may also be formed in the first side plate portion 36A, for example.

[0073] Through holes 362 are formed in the thickness direction of the second side plate portion 36B, accompanying the formation of the aforementioned bent pieces 361. The number and formation position of the through holes 362 correspond to the number and formation position of the bent pieces 361.

[0074] like Figure 2 , Figure 5 As shown, the cover 32 covers the opening 31A of the aforementioned housing body 31. The cover 32 of this embodiment has a top wall portion 37 and a peripheral wall portion 38.

[0075] The top wall portion 37 is formed as a flat plate with the Z-direction as its thickness direction, covering the opening 31A of the housing body 31. When covering the opening 31A of the housing body 31, the top wall portion 37 contacts the upper ends of the aforementioned plurality of side plate portions 36. The top view shape and size of the top wall portion 37 correspond to the top view shape and size of the housing body 31 (bottom plate portion 35). In this embodiment, the top wall portion 37 is formed as a top view rectangular shape of a size corresponding to the bottom plate portion 35 of the housing body 31.

[0076] like Figure 2 As shown, the peripheral wall portion 38 extends from the periphery of the top wall portion 37 toward the lower side (-Z side; the side in the thickness direction) of the top wall portion 37. The peripheral wall portion 38 overlaps with the entire outer surface of the side plate portion 36 when the top wall portion 37 covers the opening 31A of the housing body 31. In the example shown, the length of the peripheral wall portion 38 in the Z direction is smaller than the length of the side plate portion 36 in the Z direction, but it can, for example, be equal to the length of the side plate portion 36 in the Z direction.

[0077] like Figure 5 As shown, the cover 32 of this embodiment is made of a sheet material that can be bent. Therefore, the peripheral wall portion 38 is composed of a plurality of side wall portions 38A, 38B extending downward from each side of the top wall portion 37 by bending relative to each side of the top wall portion 37. Therefore, a gap G2 is created between adjacent side wall portions 38A, 38B (especially referring to...). Figure 5 The gap G2 of the cover 32 overlaps with the gap G1 between adjacent side plate portions 36 in the aforementioned housing body 31 when the cover 32 covers the opening 31A of the housing body 31.

[0078] The plate material constituting the cover 32 can be conductive like metal or electrically insulating like ordinary resin.

[0079] The cover 32 is secured to the housing body 31 by threads while covering the opening 31A of the housing body 31. This allows the top wall 37 of the cover 32 to be pressed against the upper ends of the plurality of side plates 36 of the housing body 31, suppressing or preventing gaps from forming between the top wall 37 and the upper ends of the plurality of side plates 36. The cover 32 can, for example, be directly threaded to the bottom plate 35 of the housing body 31.

[0080] like Figures 8-10 As shown, in this embodiment, the cover 32 is threadedly fastened to the base plate 35 via a plurality of threaded spacers 39. This will be explained below.

[0081] Each threaded spacer 39 is mainly sandwiched between the circuit board 21 housed in the housing body 31 and the top wall portion 37 of the cover 32. An external thread 391 is provided at the lower end of each threaded spacer 39 on the circuit board 21 side (-Z side). On the other hand, an internal thread 392 is provided at the upper end of each threaded spacer 39 on the cover 32 side (+Z side).

[0082] like Figure 8 , Figure 9 As shown, the external threads 391 of each threaded spacer 39 engage with the internal threads 352 of the support bosses 351 provided on the base plate portion 35. Thus, the circuit board 21 is fixed to the upper end of the plurality of support bosses 351 by thread fastening.

[0083] After that, as Figure 9 , Figure 10 As shown, with the cover 32 positioned to cover the opening 31A of the housing body 31, the mounting screws 40 pass through the top wall portion 37 of the cover 32 and engage with the internal threads 392 of each threaded spacer 39, thereby threading the cover 32 onto the threaded spacers 39. Thus, the cover 32 is threadedly fastened to the bottom plate portion 35 of the housing body 31 via the threaded spacers 39.

[0084] like Figures 3-7 As shown, the side member 33 is mounted on the inner surface of the housing body 31. The side member 33 is disposed overlapping the inner surface of the adjacent side plate portion 36 in the housing body 31, thereby covering the gap G1 between the adjacent side plate portions 36. In addition, the side member 33 covers the through hole 362 of the second side plate portion 36B.

[0085] The side member 33 has a first plate portion 331, a second plate portion 332 and a third plate portion 333.

[0086] The first plate portion 331 and the second plate portion 332 are disposed overlapping the inner surfaces of the two adjacent side plate portions 36. Specifically, the first plate portion 331 is disposed overlapping the inner surface of the first side plate portion 36A, and the second plate portion 332 is disposed overlapping the inner surface of the second side plate portion 36B adjacent to the first side plate portion 36A. With the first plate portion 331 and the second plate portion 332 disposed overlapping on the inner surfaces of the two adjacent side plate portions 36, the connecting portion of the first plate portion 331 and the second plate portion 332 covers the gap G1 between the two adjacent side plate portions 36. Furthermore, the second plate portion 332 covers the through hole 362 of the second side plate portion 36B. In the example shown, in order for the second plate portion 332 to cover the through hole 362 of the second side plate portion 36B, the length of the second plate portion 332 along the Y direction is longer than the length of the first plate portion 331 along the X direction.

[0087] The first plate portion 331 and the second plate portion 332 are respectively fixed to the inner surfaces of the first side plate portion 36A and the second side plate portion 36B by thread fastening.

[0088] The third plate portion 333 is disposed overlapping the inner surface of the base plate portion 35. In the example shown, the third plate portion 333 is formed to be connected to the lower end of the second plate portion 332, which is longer than the first plate portion 331. Alternatively, the third plate portion 333 may also be formed to be connected to the lower end of the first plate portion 331. The third plate portion 333 is fixed to the inner surface of the base plate portion 35 by threaded fastening.

[0089] In this embodiment, one side member 33 is provided in each gap G1 between adjacent side plate portions 36. Therefore, the housing 3 of this embodiment has four side members 33 corresponding to the four gaps G1 respectively. It should be noted that, for example, one side member 33 may also be provided in each of the multiple gaps G1. That is, the number of side members 33 may be less than the number of gaps G1.

[0090] like Figure 1 , Figure 2 As shown, the housing 3 of this embodiment also has a terminal opening 34 that exposes the external connection terminals 22 of the circuit board unit 2 to the outside of the housing 3. The terminal opening 34 is formed throughout the housing body 31 and the cover 32. Figure 2 , Figure 5 As shown, the terminal opening 34 is composed of a first notch 341 formed on the first side plate portion 36A of the housing body 31 and a second notch 342 formed on the peripheral wall portion 38 (side plate portion 36) and the top wall portion 37 of the cover 32. Alternatively, the terminal opening 34 may be formed only on one of the housing body 31 and the cover 32.

[0091] like Figure 1 , Figure 2As shown, the number and position of the terminal openings 34 correspond to the number and position of the external connection terminals 22 provided in the circuit board unit 2. That is, the number of terminal openings 34 in this embodiment is three. In addition, the terminal openings 34 have: a first terminal opening 34A, disposed at the first end in the X direction of the circuit board 21, corresponding to the first connection terminal 22A of the circuit board unit 2; and two second terminal openings 34B, disposed at the second end in the X direction of the circuit board 21, corresponding to the two second connection terminals 22B of the circuit board unit 2 respectively.

[0092] like Figures 1-4 As shown, the circuit module 1 of this embodiment also includes a dividing member 5. The dividing member 5 divides the housing 3's receiving space S into a first region S1 where external connection terminals 22 are disposed and a second region S2 other than the first region S1 (see reference). Figure 2 Furthermore, only the first region S1 is actively connected to the space outside the housing 3 via the terminal opening 34.

[0093] The dividing member 5 in this embodiment has elasticity similar to rubber or sponge. Furthermore, the dividing member 5 is pressed against the area surrounding the edge of the terminal opening 34 on the inner surface of the circuit board 21 and the housing 3. This suppresses or prevents the formation of gaps between the dividing member 5 and the inner surfaces of the circuit board 21 and the housing 3. In other words, it suppresses or prevents the first region S1 from connecting with the second region S2.

[0094] The aforementioned dividing member 5 has a first dividing member 5A surrounding the first connecting terminal 22A and a second dividing member 5B surrounding the two second connecting terminals 22B. In the example shown, the same second dividing member 5B independently surrounds the two second connecting terminals 22B, but for example, the same second dividing member 5B may also surround both second connecting terminals 22B together. Alternatively, for example, two second dividing members 5B may each surround the two second connecting terminals 22B.

[0095] like Figure 2 As shown, the circuit module 1 of this embodiment also includes a heat dissipation member 6. The heat dissipation member 6 is disposed between the inner surface of the housing 3 and the heat-generating component 24 mounted on the circuit board 21 to transfer the heat of the heat-generating component 24 to the housing 3. The heat dissipation member 6 of this embodiment has a first heat dissipation member 6A disposed between the circuit board unit 2 and the bottom plate portion 35 of the housing body 31, and a second heat dissipation member 6B disposed between the circuit board unit 2 and the top wall portion 37 of the cover 32. The first heat dissipation member 6A transfers the heat of the circuit board unit 2 to the bottom plate portion 35 of the housing body 31. The second heat dissipation member 6B transfers the heat of the circuit board unit 2 to the top wall portion 37 of the cover 32.

[0096] exist Figure 2 In this configuration, the first heat dissipation member 6A contacts the heat-generating component 24 mounted on the second surface 21b of the circuit board 21. This allows for efficient heat transfer from the heat-generating component 24 to the housing body 31. Furthermore, the second heat dissipation member 6B contacts the heat-generating component 24 mounted on the first surface 21a of the circuit board 21. This allows for efficient heat transfer from the first electrical component 23A to the cover 32.

[0097] As explained above, in the circuit module 1 of this embodiment, by covering the opening 31A of the housing body 31 with the cover 32, dust can be prevented from entering the interior of the housing 3 through the opening 31A of the housing body 31. In addition, the side member 33, which is disposed overlapping the inner surface of the adjacent side plate portion 36, covers the gap G1 between the adjacent side plate portions 36, thereby preventing dust from entering the interior of the housing 3 through the gap G1.

[0098] Therefore, it is possible to prevent dust from entering the housing 3 that contains the circuit board unit 2.

[0099] Furthermore, in the circuit module 1 of this embodiment, the first and second plate portions 331 and 332 of the side member 33 are respectively arranged overlappingly with the inner surfaces of the two adjacent side plate portions 36 of the housing body 31 and are fixed by threaded fastening. Additionally, the third plate portion 333 of the side member 33 is arranged overlappingly with the inner surface (upper surface) of the bottom plate portion 35 of the housing body 31 and is fixed by threaded fastening. Therefore, the side member 33 can prevent the bent portion between the side plate portions 36 and the bottom plate portion 35 of the housing body 31 from opening (so that the housing body 31 can return to a flat plate). Furthermore, it can prevent gaps from forming between the two side plate portions 36 and the inner surfaces of the bottom plate portion 35 of the housing body 31 and the side member 33, thereby preventing dust from entering the interior of the housing 3 through these gaps.

[0100] Furthermore, in the circuit module 1 of this embodiment, the side member 33 covers the through hole 362 of the second side plate portion 36B that extends along the thickness direction of the second side plate portion 36B, accompanying the formation of the bending piece 361. This prevents dust from entering the interior of the housing 3 through the through hole 362 of the second side plate portion 36B. Additionally, compared to covering the through hole 362 of the side plate portion 36 with other members, the number of constituent parts of the housing 3 can be reduced.

[0101] Furthermore, in the circuit module 1 of this embodiment, the housing space S of the housing 3 is divided by the dividing member 5 into a first region S1 where external connection terminals 22 are arranged and a second region S2 other than the first region S1. Additionally, the dividing member 5 is pressed against the area surrounding the edge of the terminal opening 34 in the circuit board 21 and the inner surface of the housing 3. This suppresses or prevents dust from entering the interior of the housing 3 (particularly the second region S2) through the terminal opening 34.

[0102] Furthermore, by making the dividing member 5 elastic, even if an external force such as an impact is applied to the housing 3 from the outside, the dividing member 5 can absorb the external force. As a result, the external force acting on the circuit board unit 2, including the circuit board 21, can be suppressed, thereby protecting the circuit board unit 2.

[0103] Furthermore, in the circuit module 1 of this embodiment, when the top wall portion 37 of the cover 32 covers the opening 31A of the housing body 31, the peripheral wall portion 38 of the cover 32 overlaps with the outer surfaces of the plurality of side plate portions 36. As a result, when the cover 32 covers the opening 31A of the housing body 31, it is possible to effectively prevent dust from entering the interior of the housing 3 through the gap between the housing body 31 and the cover 32 (especially the gap between the upper end of the side plate portion 36 and the top wall portion 37).

[0104] Furthermore, in the circuit module 1 of this embodiment, the heat dissipation member 6 is disposed between the inner surface of the housing 3 and the heat-generating component 24 of the circuit board unit 2. This allows for the efficient release of heat generated in the heat-generating component 24 to the housing 3.

[0105] The embodiments of this utility model have been described above, but this utility model is not limited to the above embodiments and can be appropriately modified without departing from its spirit.

[0106] In this invention, the cover 32 may be composed of only the top wall portion 37, that is, it may be formed as a flat plate.

[0107] In this invention, the side member 33 may, for example, not have the third plate portion 333.

[0108] The circuit module of this invention can be installed in any device, such as a projection display device that projects image light (image) onto a display surface such as a screen.

[0109] The circuit module (especially the circuit board unit) of this invention can have any function, such as a drive module that supplies power to various power-consuming components to drive those components.

Claims

1. A circuit module, characterized in that, The circuit module includes at least a circuit board unit and a housing that houses the circuit board unit. The housing includes at least a housing body, a cover, and side members. The housing body has a receiving space that opens in a predetermined direction to accommodate the circuit board unit. The cover covers the opening of the housing body, and the side members are mounted on the inner surface of the housing body. The main body of the housing has a base plate and multiple side plates. The base plate is polygonal in shape when viewed from above. The multiple side plates extend from each side of the base plate toward one side of the thickness direction of the base plate by bending relative to each side of the base plate, thereby forming openings in the main body of the housing. The side member is configured to overlap at least with the inner surface of the adjacent side plate portion, thereby covering the gap between the adjacent side plate portions.

2. The circuit module according to claim 1, characterized in that, The side member has a first plate portion, a second plate portion, and a third plate portion. The first plate portion and the second plate portion are respectively disposed overlapping the inner surfaces of two adjacent side plate portions, and the third plate portion is disposed overlapping the inner surface of the bottom plate portion. The first plate portion and the second plate portion are respectively fixed to the inner surfaces of the two adjacent side plate portions by thread fastening. The third plate is fixed to the inner surface of the base plate by threaded fastening.

3. The circuit module according to claim 1 or 2, characterized in that, At least one of the side plate portions has: A bent piece is formed by bending the portion of the side plate surrounded by the cut line relative to the rest of the side plate portion outward from the outer side of the housing body; and A through hole, which extends through the side plate portion in the thickness direction along with the formation of the bent piece. The side member covers the through hole of the side plate.

4. The circuit module according to claim 1 or 2, characterized in that, The circuit board unit includes at least a circuit board and external connection terminals mounted on the circuit board. The housing has terminal openings that expose the external connection terminals to the outside. The circuit module further includes a dividing member that divides the housing's receiving space into a first region and a second region. The first region is the region where the external connection terminals are configured, and the second region is the area of ​​the receiving space excluding the first region. The dividing member is elastic and is pressed against the area surrounding the edge of the terminal opening in the inner surface of the circuit board and the housing.

5. The circuit module according to claim 1 or 2, characterized in that, The cover has a top wall and a peripheral wall. The top wall covers the opening of the housing body, and the peripheral wall extends from the periphery of the top wall towards one side in the thickness direction of the top wall. With the top wall covering the opening of the housing body, the peripheral wall overlaps with the outer surfaces of the plurality of side plates.

6. The circuit module according to claim 1 or 2, characterized in that, The circuit board unit includes a circuit board and a heat-generating component mounted on the circuit board. The circuit module also includes a heat dissipation component, which is disposed between the inner surface of the housing and the heat-generating component, thereby transferring the heat from the heat-generating component to the housing.

7. A projection-type display device, comprising a circuit module, characterized in that, The circuit module includes at least a circuit board unit and a housing that houses the circuit board unit. The housing includes at least a housing body, a cover, and side members. The housing body has a receiving space that opens in a predetermined direction to accommodate the circuit board unit. The cover covers the opening of the housing body, and the side members are mounted on the inner surface of the housing body. The main body of the housing has a base plate and multiple side plates. The base plate is polygonal in shape when viewed from above. The multiple side plates extend from each side of the base plate toward one side of the thickness direction of the base plate by bending relative to each side of the base plate, thereby forming openings in the main body of the housing. The side member is configured to overlap at least with the inner surface of the adjacent side plate portion, thereby covering the gap between the adjacent side plate portions.

8. The projection display device according to claim 7, characterized in that, The side member has a first plate portion, a second plate portion, and a third plate portion. The first plate portion and the second plate portion are respectively disposed overlapping the inner surfaces of two adjacent side plate portions, and the third plate portion is disposed overlapping the inner surface of the bottom plate portion. The first plate portion and the second plate portion are respectively fixed to the inner surfaces of the two adjacent side plate portions by thread fastening. The third plate is fixed to the inner surface of the base plate by threaded fastening.

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