CN213338297U - DMD assembly and projection optical machine - Google Patents

Abstract

The utility model relates to a DMD subassembly and projection ray apparatus, the DMD subassembly includes fixing base, elasticity compressing tightly piece, circuit board, connector and DMD device, the elasticity compressing tightly piece includes along two fixed parts and elasticity compressing tightly portion that set up relatively, all is provided with the spacing slotted hole on each fixed part, the spacing slotted hole on at least one fixed part extends along the relative direction of two fixed parts and sets up; the elastic pressing part is pressed against the circuit board; the fixing seat comprises a body part and a limiting boss, wherein an anti-disengaging structure is arranged at one end of the limiting boss, which is far away from the body part, and at least part of the anti-disengaging structure extends out of the outer edge of the limiting boss; the limiting groove holes and the limiting bosses are correspondingly inserted and matched, the fixing part is located between the body part and the anti-falling structure, and the limiting bosses extend out of the surface, facing the surface of the circuit board, of the fixing part where the limiting bosses are located, so that a space is reserved between the fixing part and the anti-falling structure. The utility model discloses can increase the elasticity packing force, improve the reliability that circuit board, connector and DMD device are connected.

Description

DMD assembly and projection optical machine

Technical Field

The utility model relates to a DMD installation technical field, concretely relates to DMD subassembly and projection ray apparatus.

Background

A DMD (Digital micromirror Device) is a core Device of Digital Light Processing (DLP) technology, and realizes a projected image mainly by adjusting reflected light. The DMD device is electrically connected with the circuit board through a connector. The contact condition among the DMD device, the connector and the circuit board can greatly affect the projection effect, and in order to realize good contact between the DMD device and the connector, an elastic part is required to be arranged to press the circuit board and the connector onto the DMD device.

In a prior art, compress tightly circuit board and connector in the DMD device through compact structure, elasticity compressing tightly the piece through the screw fastening on the fixing base, mainly rely on the elasticity deformation of elasticity compressing tightly piece self to produce elasticity and apply on the circuit board, because elasticity compressing tightly the piece and fasten on the fixing base, therefore elasticity compressing tightly the elastic deformation scope of piece is limited, has restricted compact structure's packing force. However, reliable contact of each contact is required between the connector and the DMD device, and the area of each contact is very small, so the contact area between the contacts is also very small, and if the pressing force is insufficient, the contact among the circuit board, the connector and the DMD is easy to be poor, thereby affecting the reliability of the contact among the three.

SUMMERY OF THE UTILITY MODEL

Based on above-mentioned current situation, the utility model discloses a main aim at provides a DMD subassembly and projection ray apparatus to solve the above-mentioned problem that appears in the installation of current DMD.

In order to achieve the above object, the utility model adopts the following technical scheme:

a first aspect of the present invention provides a DMD assembly of a projection optical device, including a fixing base, an elastic pressing member, a circuit board, a connector, and a DMD device, wherein the DMD device is provided with a first electrical connection structure, and the first electrical connection structure includes a plurality of first contacts; the connector is provided with a second electrical connection structure, and the second electrical connection structure comprises a plurality of second contacts; the circuit board is provided with a third electrical connection structure, and the third electrical connection structure comprises a plurality of third contacts; the fixing seat is used for fixing the circuit board, the connector and the DMD device on a base body, so that the third electrical connection structure, the second electrical connection structure and the first electrical connection structure are pressed through the elastic pressing piece to realize the electrical connection of the corresponding first contact, the second contact and the third contact;

the elastic pressing piece comprises two fixing parts which are oppositely arranged and an elastic pressing part which is connected with the two fixing parts, each fixing part is provided with a limiting slotted hole, and the limiting slotted hole on at least one fixing part extends along the opposite direction of the two fixing parts; the elastic pressing part is pressed against the circuit board;

the fixing seat comprises a body part and a limiting boss which is arranged on the body part in a protruding mode, wherein an anti-disengaging structure is arranged at one end, far away from the body part, of the limiting boss, and the anti-disengaging structure extends out of the outer edge of the limiting boss in the direction perpendicular to the thickness direction of the DMD device;

the limiting groove holes and the limiting bosses are correspondingly inserted and matched, the fixing parts are located between the body part and the anti-falling structures, and the limiting bosses extend out of the surfaces, facing the circuit board, of the fixing parts where the limiting bosses are located.

Preferably, the limiting slotted hole on one fixing part is a slotted hole extending along the opposite direction; and the limiting groove hole in the other fixing part is consistent with the outline of the limiting boss.

Preferably, the slotted hole is a strip-shaped groove, extends along the opposite direction and penetrates through to an inner edge of the fixing portion where the slotted hole is located, and the inner edge refers to two opposite edges of the fixing portion.

Preferably, the fixing part comprises a connecting structure and an extending structure, the connecting structure is connected with the elastic pressing part, the extending structure extends from the inner side edge of the connecting structure to the opposite fixing part, and a gap is formed between the extending structure and the elastic pressing part; the strip-shaped groove is arranged on the fixing part and extends from the connecting structure to penetrate through the extending structure.

Preferably, the extension structure comprises an extension section connected to the connection structure and a bending section connected to an end of the extension section, and the bending section is bent towards one side of the circuit board relative to the extension section; the height of the limiting boss is larger than the size of the connecting structure and the extension section in the thickness direction of the DMD device.

Preferably, the two fixing parts and the two elastic pressing parts are arranged and respectively have strip-shaped sheet structures, and the two fixing parts and the two elastic pressing parts are arranged at intervals and are sequentially connected end to end;

the first electric connection structure, the second electric connection structure and the third electric connection structure are correspondingly provided with two groups, and the two groups correspond to the two elastic pressing parts.

Preferably, the elastic pressing part comprises a plane section arranged opposite to the third electrical connection structure and connection sections connected to two ends of the plane section, and the elastic pressing part is connected with the fixing part through the connection sections; in a group of corresponding plane segments and third electrical connection structures, along the thickness direction of the DMD device, the projection of the third electrical connection structure is located within the projection edge of the plane segment.

Preferably, along a thickness direction of the DMD device, a projection of the third electrical connection structure is located within an edge of a projection of the planar segment.

Preferably, the limiting boss is of a cylindrical structure; the inner wall of the limit slotted hole arranged in an extending mode comprises two planes arranged oppositely and an arc surface for connecting the two planes.

Preferably, the limiting boss is provided with a locking hole; still include the retaining member, the retaining member include interconnect's locking structure with anti-disengaging structure, locking structure with locking hole screw-thread fit.

Preferably, the body part is provided with a groove, the limiting boss is arranged on the bottom surface of the groove, and the height of the limiting boss is smaller than the depth of the groove; the elastic pressing piece partially extends out of the groove in a free state.

A second aspect of the utility model provides a projection ray apparatus, including base member and as above arbitrary DMD subassembly, the DMD subassembly passes through the fixing base install in the base member.

The DMD component of the utility model is characterized in that on one hand, the fixed seat is provided with a limit boss, the elastic pressing piece is provided with an extended limit slot hole, the limit slot hole is matched with the limit boss in a plug-in manner, in the process of locking the fixed seat and the base body, the extended limit slot hole provides enough space for the deformation of the elastic pressing piece, and the elastic pressing piece part can slide along the extending direction of the limit slot hole and further deform, so that the elastic pressing force can be increased, and the connection reliability of a circuit board, a connector and a DMD device is improved; and because the limitation that receives spacing boss and spacing slotted hole, the part that elasticity compressed tightly the piece can only slide along the spacing slotted hole that extends the setting, so, the uncontrollable slip can not take place for the elasticity compressed tightly the piece to guarantee that elasticity compressed tightly the piece and can not change circuit board, connector and DMD device compression position, further guarantee first electric connection structure, second electric connection structure and third electric connection structure relative position can not change, improve the reliability of three contact. On the other hand, the end face of the limiting boss at least extends out of part of the surface of the fixing part, so that the elastic pressing piece can be prevented from being completely separated from the fixing seat when being elastically deformed; further, still be provided with anti-disengaging structure at the tip of spacing boss, consequently, elasticity compresses tightly the piece and when taking place elastic deformation and compress tightly piece and fixing base assembly into a whole and dismantle the removal, elasticity compresses tightly the piece and is difficult for breaking away from with the fixing base, consequently, is favorable to the installation of whole DMD subassembly.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.

Drawings

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:

fig. 1 is a system diagram of a preferred embodiment of a DMD assembly provided by the present invention;

fig. 2 is an exploded view of a preferred embodiment of a DMD assembly provided by the present invention;

fig. 3 is a schematic structural diagram illustrating an assembly state of the fixing seat and the elastic pressing member in the preferred embodiment of the DMD assembly provided by the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is an exploded view of the fixing base and the elastic pressing member in the DMD assembly according to the present invention;

fig. 6 is a cross-sectional view of a preferred embodiment of an electronic device provided by the present invention.

In the figure:

10. a substrate; 11. a positioning column;

20. a fixed seat; 21. a body portion; 211. a groove; 212. positioning holes; 213. positioning the through groove; 22. a limiting boss; 221. a locking hole; 23. mounting holes; 24. a unfilled corner-shaped groove;

30. an elastic pressing member; 31. an elastic pressing part; 311. a planar section; 312. a connecting section; 32. a fixed part; 321. a first limit slot hole; 322. a second limit slot hole; 323. a connecting structure; 324. an extension structure; 3241. an extension section; 3242. bending the section;

40. a circuit board;

50. a connector; 51. a second electrical connection structure;

60. a DMD device; 61. a first electrical connection structure;

70. a seal member; 71. sealing the sheet; 711. a through hole; 72. a seal ring;

80. a locking member; 81. an anti-falling structure; 82. a locking structure;

91. a first fastener; 92. a second fastener; 93. a coil spring;

100. a heat sink; 110. a heat dissipating section; 111. a connecting plate; 112. a heat sink; 120. a heat transfer portion;

200. a thermally conductive pad.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the spirit of the present invention, well-known methods, procedures, flows, and components have not been described in detail.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The utility model discloses in "outside" and "inboard" be for electronic equipment itself, be close to the inside one side of electronic equipment for the inboard, keep away from the inside one side of electronic equipment for the outside.

The utility model provides a projection ray apparatus, refer to fig. 1-6, electronic equipment includes base member 10 and DMD subassembly, and when electronic equipment was the projection ray apparatus, base member 10 can be for the ray apparatus shell, DMD unit mount in base member 10.

Specifically, referring to fig. 1-5, the DMD assembly includes a fixing base 20, an elastic pressing member 30, a circuit board 40, a connector 50, and a DMD device 60, which are disposed from outside to inside, it is understood that the outside to inside only is used to define the positional relationship among the fixing base 20, the elastic pressing member 30, the circuit board 40, the connector 50, and the DMD device 60, and it is not limited that these five components are necessarily disposed adjacently, any two adjacent components may be directly contacted or oppositely disposed (i.e. no other component is disposed therebetween), or other components may be disposed between the two components, such as the fixing base 20 directly contacting the elastic pressing member 30, the circuit board 40 directly contacting the connector 50, the connector 50 directly contacting the DMD device 60, a component such as a sealing member 70 may be disposed between the elastic pressing member 30 and the circuit board 40, the seal 70 may be provided on the outer peripheral side of the connector 50 and on the surface of the circuit board 40 facing the connector 50. The DMD device 60 is provided with a first electrical connection structure 61, the connector 50 is provided with a second electrical connection structure 51, and the circuit board 40 is provided with a third electrical connection structure (not shown). The fixing base 20 is used for fixing the circuit board 40, the connector 50 and the DMD device 60 to the base 10, that is, the DMD assembly is installed on the base 10 through the fixing base 20, so as to compress the third electrical connection structure, the second electrical connection structure 51 and the first electrical connection structure 61 through the elastic compression member 30 to realize two-by-two contact electrical connection of the three, that is, the third electrical connection structure contacts with the second electrical connection structure 51, the second electrical connection structure 51 contacts with the first electrical connection structure 61, thereby realizing electrical connection of the third electrical connection structure, the second electrical connection structure 51 and the first electrical connection structure 61.

It can be understood that, if the elastic pressing member 30 and the fixing base 20 are not fixed, in the process of locking the fixing base 20 and the substrate 10, the elastic pressing member 30 will tend to slide, and the sliding direction is not controllable, so that the relative positions of the circuit board 40, the connector 50 and the DMD device 60 are changed, which may cause the third electrical connection structure, the second electrical connection structure 51 and the first electrical connection structure 61 to be in poor contact, even not in contact, and need to be readjusted. In order to solve the problem, the elastic pressing member 30 may be fixed to the fixing base 20, and as mentioned in the background art, the elastic pressing member 30 is directly fixed to the fixing base 20 by a screw, so that the elastic pressing member 30 is limited by a locking portion during adjustment, deformation of the elastic pressing member 30 is limited, the elastic pressing force is limited, the pressing effect on the circuit board 40, the connector 50 and the DMD device 60 is reduced, and reliability of electrical connection between the circuit board 40, the connector 50 and the DMD device 60 is affected.

In view of the above problem, in the DMD assembly of the present invention, the elastic pressing member 30 comprises an elastic pressing portion 31 and fixing portions 32, the fixing portions 32 are connected to both ends of the elastic pressing portion 31, that is, the two fixing portions 32 are disposed opposite to each other, and are connected with each other by the elastic pressing portion 31, each fixing portion 32 is provided with a limiting slot (such as a first limiting slot 321 and a second limiting slot 322), the limiting slot is a limiting hole (indicating a ring structure with a closed side wall) or a limiting groove (indicating a gap on the side wall, or the side wall is broken at the gap and cannot form a closed structure), the limiting slot 321 on at least one fixing portion 32 extends along the opposite direction (such as the X direction in the figure), that is, the limiting slotted hole on at least one fixing portion 32 is a slotted hole, for example, both limiting slotted holes on two fixing portions 32 are slotted holes, or only one limiting slotted hole on one fixing portion 32 is a slotted hole; the elastic pressing portion 31 presses against the circuit board 40 to press the circuit board 40, the connector 50 and the DMD device 60 together, so that the third electrical connection structure, the second electrical connection structure 51 and the first electrical connection structure 61 are better contacted with each other. Fixing base 20 includes this part of the body 21, and the outstanding spacing boss 22 that sets up in this part of the body 21 one side towards elasticity compressor element 30, the one end that this part of the body 21 was kept away from to spacing boss 22 is provided with anti-disengaging structure 81, anti-disengaging structure 81 stretches out the outward flange of spacing boss 22 in the direction of the thickness direction Y of perpendicular to DMD device 60, can all marginal areas of anti-disengaging structure all stretch out spacing boss, or, along the outstanding direction of spacing boss 22, the projection of anti-disengaging structure 81 is marked as first projection, the projection of spacing boss 22 is marked as the second projection, then the outward flange of first projection is located outside the projected outward flange of second. Wherein, the fixing seat 20 can be connected with the base body 10 through the body part 21. The limiting slot holes and the limiting bosses 22 are correspondingly inserted and matched, that is, the number of the limiting slot holes is equal to that of the limiting bosses 22, and the limiting slot holes and the limiting bosses 22 are arranged in a one-to-one correspondence manner. The fixing portion 32 is located between the main body portion 21 and the anti-separation structure 81, and the limiting boss 22 extends out of the surface of the fixing portion 32 facing the circuit board 40, so that a space is left between the fixing portion 32 and the anti-separation structure 81.

In the DMD assembly in the above embodiment, on one hand, the fixing base 20 is provided with the limiting boss 22, the elastic pressing member 30 is provided with the extending limiting slot, the limiting slot is inserted into and matched with the limiting boss 22, in the process of locking the fixing base 20 and the base body 10, the extending limiting slot can provide enough space for the deformation of the elastic pressing member 30, and part of the elastic pressing member 30 can slide along the extending direction of the limiting slot, so that the elastic pressing force of the elastic pressing member 30 is increased, and the reliability of connection of the circuit board 40, the connector 50 and the DMD device 60 is improved. Of course, there are many ways to increase the elastic pressing force of the elastic pressing member 30, but there are only ways to increase the elastic pressing force, and it is difficult to avoid the sliding of the elastic pressing member 30 as a whole in the process of deformation of the elastic pressing member 30, and more serious, if the moving direction is not controllable, the circuit board 40, the connector 50 and the DMD device 60 may also be relatively dislocated, even the first electrical connection structure 61, the second electrical connection structure 51 and the third electrical connection structure cannot contact each other, so as to increase the debugging difficulty of the DMD assembly, but the present invention not only increases the elastic pressing force by providing the limiting slot extending along the relative direction X, but also only part of the elastic pressing member 30 can slide along the extending limiting slot due to the limitation of the limiting boss 22 and the limiting slot, so that the sliding of the elastic pressing member 30 is controlled, therefore, the pressing positions of the elastic pressing piece 30 on the circuit board 40, the connector 50 and the DMD device 60 are not changed, the relative positions of the first electrical connection structure 61, the second electrical connection structure 51 and the third electrical connection structure are further not changed, and the contact reliability of the three is improved.

On the other hand, after the limiting boss 22 and the limiting slot hole are arranged, in order to facilitate the adjustment of the DMD assembly, during assembly, the elastic pressing member 30 needs to be installed on the fixing seat 20 first, and then installed on the base body 10 together with the circuit board 40, the connector 50 and the DMD device 60, when the elastic pressing member 30 and the fixing seat 20 are moved as a whole, or in the process of deformation of the elastic pressing member 30, the limiting boss 22 may be completely separated from the limiting slot hole, so that the elastic pressing member 30 is separated from the base body 10, and the assembly progress is affected, but the height of the limiting boss 30 is increased as much as possible by arranging the limiting boss 22 to extend out of the surface of the fixing part 32, so that the risk that the elastic pressing member 30 is completely separated from the fixing seat 20 when being elastically deformed or moving as a whole with the fixing seat 20 can be reduced; further, the end of the limiting boss 22 is further provided with an anti-disengaging structure 81, so that the elastic pressing piece 30 is elastically deformed and is assembled with the fixing seat 20 into a whole to be detached and moved, and the elastic pressing piece 30 is not easily separated from the fixing seat 20, thereby facilitating the installation of the whole DMD assembly. And through making spacing boss 22 stretch out the surface of fixed part 32, leave the interval between fixed part 32 and anti-disengaging structure 81, when elasticity compressing component 30 takes place the deformation, elasticity compressing component 30 basically can not touch anti-disengaging structure 81, can guarantee the performance of its elastic force better to make circuit board 40, connector 50 and DMD device 60 electric connection more reliable.

With continued reference to fig. 2, there are two first electrical connection structures 61 on the DMD device 60, each first electrical connection structure 61 includes a plurality of first contacts arranged in an array, the rows of the array may be parallel to the opposite direction X, and the columns may be perpendicular to both the thickness direction Y and the opposite direction X of the DMD device. Correspondingly, there are two second electrical connection structures 51 on the connector 50, each second electrical connection structure 51 includes a plurality of second contacts arranged in an array, the rows of the array may be parallel to the opposite direction X, and the rows may be perpendicular to both the thickness direction Y and the opposite direction X of the DMD device. Similarly, there are two third electrical connection structures on the circuit board 40, each third electrical connection structure includes a plurality of third contacts arranged in an array, rows of the array may be parallel to the opposite direction X, and rows may be perpendicular to both the thickness direction Y and the opposite direction X of the DMD device. When the fixing base 20 is locked with the base 10, the two first electrical connection structures 61, the two second electrical connection structures 51, and the two third electrical connection structures are correspondingly formed into two groups, that is, each group includes one first electrical connection structure 61, one second electrical connection structure 51, and one third electrical connection structure, and the first electrical connection structure 61, the second electrical connection structure 51, and the third electrical connection structure in each group are correspondingly disposed at positions to realize the corresponding electrical connection of the first contact, the second contact, and the third contact.

For each fixing portion 32, the number of the limiting slot holes thereon is not limited, for example, one limiting slot hole may be provided on each fixing portion 32, or two or more limiting slot holes may be provided, and the number of the limiting slot holes on each fixing portion 32 may be equal or unequal. However, the shape of the limiting slot on each fixing portion 32 is selected to be the same, for example, the limiting slot on the same fixing portion 32 is an extended limiting slot (i.e. a slotted hole), the lengths (the size along the extending direction) of the slotted holes may not be the same, or the limiting slot on the same fixing portion 32 is a round hole or a square hole, and of course, the limiting slot may be a slot with other shapes.

For convenience, one of the limiting slots of the fixing portions 32 can be defined as a first limiting slot 321, and the other of the limiting slots of the fixing portions 32 can be defined as a second limiting slot 322. Specifically, the two fixing portions 32 may be provided with slotted holes, for example, the first limiting slotted hole 321 and the second limiting slotted hole 322 are both kidney-shaped holes, the length direction of the kidney-shaped holes is consistent with the opposite direction X, the width (referring to the dimension in the direction perpendicular to the opposite direction X and the thickness direction Y) is substantially the same as the width (referring to the dimension in the direction perpendicular to the opposite direction X and the thickness direction Y) or the radius of the limiting boss 22, that is, the dimension in the width direction may be equal to or slightly larger than the dimension of the limiting boss 22, so that the limiting boss 22 can move relative to the kidney-shaped holes along the length direction of the kidney-shaped holes. For another example, the first limiting slot hole 321 and the second limiting slot hole 322 are both strip-shaped grooves, the strip-shaped grooves extend along the opposite direction X and penetrate through the edge of the fixing portion 32, and may penetrate through the inner edge or the outer edge, and the groove width of the strip-shaped grooves is substantially the same as the width of the limiting bosses 22. Wherein the inner edge refers to the edge of the two fastening portions 32 opposite to each other, and the outer edge refers to the edge of the two fastening portions 32 facing away from each other.

In the embodiment of providing two kidney-shaped holes or two strip-shaped grooves, since the elastic pressing element 30 can move relatively at two positions of the fixing base 20, the position of the elastic pressing element 30 may be shifted, and to solve this problem, in a preferred embodiment, in the relative direction X, the size of the limiting slot hole on one fixing portion 32 is larger than that of the limiting slot hole on the other fixing portion 32, that is, if the first limiting slot hole 321 and the second limiting slot hole 322 are both strip-shaped slot holes, the length of the first limiting slot hole 321 is larger than that of the second limiting slot hole; if the first limiting slot hole 321 is a slotted hole and the second limiting slot hole 322 is a slot hole with other shapes, the length of the first limiting slot hole 321 is greater than the size of the second limiting slot hole 322 in the opposite direction X, so that the slidable distance of the fixing portion 32 provided with the first limiting slot hole 321 in the opposite direction is inevitably greater than the slidable distance of the fixing portion 32 provided with the second limiting slot hole 322 in the opposite direction X, and thus, the position deviation of the elastic pressing piece 30 can be reduced as much as possible, the deformation of the elastic pressing piece 30 can be better controlled, and the reliability of the electrical connection of the circuit board 40, the connector 50 and the DMD device 60 can be improved.

Further, only one fixing portion 32 may be provided with a strip-shaped slot, such as a strip-shaped slot or a waist-shaped hole, referring to fig. 5, the limiting slot on one fixing portion 32 is a strip-shaped slot, and the strip-shaped slot extends along the opposite direction X and penetrates to the inner edge of the fixing portion 32 where the strip-shaped slot is located; the limiting slot hole on the other fixing part 32 is consistent with the outer contour of the limiting boss 22. If the first limiting slot hole 321 is a strip-shaped groove and extends towards the side where the other fixing part 32 is located opposite to the fixing part 32 where the first limiting slot hole is located, and the inner wall of the second limiting slot hole 322 is in accordance with the outer wall of the limiting boss 22, wherein the first limiting slot hole 321 may also be a kidney-shaped hole, and the width of the strip-shaped groove or the kidney-shaped hole is substantially the same as the width of the limiting boss 22, that is, the width of the strip-shaped groove or the kidney-shaped hole may be equal to or slightly greater than the width of the limiting boss 22, so that the limiting boss 22 on one fixing part 32 is matched with the hole with the same shape, the position is basically determined, and the limiting boss 22 on the other fixing part 32 is matched with the waist-shaped hole or the strip-shaped groove, and can perform relative movement, so that the limiting slot hole adopting the combination can reduce the relative movement range between the second limiting slot hole 322, in the process of locking the fixing base 20 and the base 10, the fixing portion 32 where the second limiting groove hole 322 is located is basically fixed relative to the fixing base 20, and the fixing portion 32 where the first limiting groove hole 321 is located slides relative to the fixing base 20, so that the elastic pressing member 30 can be better ensured to be fixed at a certain position by matching the limiting boss 22 on one side with the limiting groove hole with the same shape, and the strip-shaped groove on the other side penetrating through the inner edge of the fixing portion 32 can obtain the large deformation of the elastic pressing member 30, so that the deformation range and the activity of the elastic pressing member 30 can be better controlled, and further the reliability of the electrical connection of the circuit board 40, the connector 50 and the DMD device 60 is further improved. Of course, the strip-shaped groove in the above-mentioned embodiment may also penetrate through the outer edge of the fixing portion 32, or be a waist-shaped hole, or penetrate through both the inner edge and the outer edge, which may affect the strength and reliability of the elastic pressing member 30.

In the embodiment where only one of the fixing portions 32 is provided with a slotted hole, the inner wall of the limiting slotted hole of the other fixing portion 32 may also be different from the outer wall of the limiting boss 22, for example, the first limiting slotted hole is a slotted groove or a waist-shaped hole penetrating through one or both side edges of the fixing portion 32, and the second limiting slotted hole 322 may be a hole pattern such as a square hole or a round hole.

In order to simplify the structure and to enable the fixing portions 32 to slide smoothly when the elastic pressing member 30 is deformed, it is preferable that each fixing portion 32 is provided with one limiting slot, that is, one limiting slot 321 is provided in each of the first limiting slot and the second limiting slot 322, as shown in fig. 5. Further, the central planes of the two limiting slot holes are coplanar and parallel to the opposite direction X, so as to further ensure that the fixing portion 32 can smoothly move when the elastic pressing member 30 deforms, and avoid acting forces in directions other than the opposite direction from being generated between the fixing portion 32 and the limiting boss 22. Wherein, the central plane of the limiting slotted hole is a plane passing through the central line thereof and parallel to the opposite direction X.

With continued reference to fig. 5, the fastening portion 32 may include a connecting structure 323 connecting the resilient compression portions 31 and an extension structure 324, the extension structure 324 extending from an inner edge of the connecting structure 323 to the opposite fastening portion 32. In the fixing portion 32 provided with the strip-shaped groove, the strip-shaped groove extends from the connecting structure 323 and penetrates the extending structure 324. With this structure, especially, the fixing portion 32 provided with the slotted hole is structured such that the fitting area of the limit boss 22 and the slotted hole can be enlarged by the extension structure 324, and at the same time, the mounting reliability of the fixing portion 32 can be improved and the amount of deformation of the elastic pressing member 30 can be increased.

Further, a gap is formed between the extending structure 324 and the elastic pressing portion 31, that is, the elastic pressing portion 31 is only connected with the connecting structure 323 in the fixing portion 32 and is not connected with the extending structure 324, so that the elastic deformation of the elastic pressing portion 31 is less restricted, and the elastic deformation capability of the elastic pressing portion 31 can be effectively increased, so that the elastic pressing portion 31 can provide a greater elastic force to press the circuit board 40, the connector 50, and the DMD device 60.

It should be noted that, in the embodiment of providing the kidney-shaped hole, the fixing portion 32 may also include the connecting structure 323 and the extending structure 324, that is, the fixing portion 32 may be provided with the connecting structure 323 and the extending structure 324 at the same time no matter how the limiting slot hole on the fixing portion 32 is provided. Of course, the securing portion 32 may include only the connecting structure 323; it is also possible that only one fastening portion 32 is provided with both the connecting structure 323 and the extending structure 324, and the other fastening portion 32 is provided with only the connecting structure 323, in this embodiment, when only one fastening portion 32 is provided with a slotted hole, it is preferable that the fastening portion 32 in which the slotted hole is located is provided with the extending structure 324. In another embodiment, the two fixing portions 32 may be provided with the extending structures 324, the extending lengths of the two extending structures 324 may be equal or unequal, in an unequal embodiment, when only one fixing portion 32 is provided with a slotted hole, it is preferable that the fixing portion 32 where the slotted hole is located is provided with the extending structure 324, as shown in the embodiment shown in fig. 5, the first limiting slotted hole 321 is a slotted hole, and the length of the extending structure 324 of the fixing portion 32 where the first limiting slotted hole is located is longer; the second position-limiting slot hole 322 is a circular hole, and the length of the extending structure 324 of the fixing portion 32 is shorter.

In the embodiment of the strip-shaped groove having both the extending structure 324 and the through extending structure 324, the strip-shaped groove may affect the structural strength of the elastic pressing member 30, and in view of this problem, in a preferred embodiment of the present invention, the extending structure 324 includes an extending section 3241 connected to the connecting structure 324 and a bending section 3242 connected to an end of the extending section 3241, and the bending section 3242 is bent toward a side where the circuit board 40 is located relative to the extending section 3241. The bending section 3242 and the extending section 3241 may be bent in a sharp angle or an arc shape. In this embodiment, in order to ensure that the end surface of the position restricting projection 322 protrudes beyond the surface of the fixing portion 32, the height of the boss 322 (i.e., the dimension along the protruding direction thereof, which is the dimension in the thickness direction Y when the protruding direction is parallel to the thickness direction Y) can be limited to be greater than the dimension of the entire fixing portion 32 (including the bent section 3242) in the thickness direction Y, however, the size of the fixing seat 20 and the elastic pressing member 30 in the thickness direction Y is necessarily increased, and the limiting boss 22 is too high, when the elastic pressing member 30 deforms, the target deformation amount may not be reached, the anti-slip structure 81 may already abut against the circuit board 40, so that the elastic force of the elastic pressing member 30 cannot be effectively exerted, to avoid the above problem, it is preferable that the height of the position restricting projection 22 is only larger than the dimension of the connecting structure 323 and the extension section 3241 in the thickness direction Y.

In particular, the connecting structure 322 and the extending section 3241 may be flat plate structures, and the bent section 3232 may be formed by bending at the edge of the extending section 3241, which is particularly suitable for the embodiment in which the fixing portion 32 is sheet-shaped (described in detail below). The thickness (i.e., the dimension along the thickness direction Y) of the connecting structure 322 and the extension portion 3241 is not limited by the flat plate structure, and the flat plate structure may be a flat plate formed by a thin sheet or a thick plate with a large thickness, and the flat plate structure merely means that the flat plate extends along a plane, and the plane may be perpendicular to the thickness direction Y, and the surface of the flat plate may be a plane or a wavy curved surface.

In the above embodiments, only one elastic pressing portion 31 may be provided, and in this case, it preferably abuts against an area of the circuit board 40 located between the two sets of third electrical connection structures. In order to better compress the two first electrical connection structures 61, the two second electrical connection structures 51 and the two third electrical connection structures in a group by group through the elastic compression member 30, so as to improve the reliability of the electrical connection of the three, in a preferred embodiment, the number of the elastic compression portions 31 is two, the two elastic compression portions 31 and the two third electrical connection structures are correspondingly arranged, that is, one elastic compression portion 31 is over against a group of the third electrical connection structures, the second electrical connection structures 51 and the first electrical connection structures 61, as shown in fig. 5, the two fixing portions 32 and the two elastic compression portions 31 are arranged at intervals and are sequentially connected end to form a square structure, so that the strength of the whole elastic compression member 30 can be increased. In another embodiment, the two elastic pressing portions 31 may not be connected to the end of the fixing portion 32. Further, the elastic pressing portion 31 is a strip-shaped structure, and the extending direction thereof is consistent with the relative direction X, even if the elastic pressing portion 31 extends along the direction of the row in the third contact array, so that the corresponding pressing of the two sets of first electrical connection structures 61, the second electrical connection structures 51 and the third electrical connection structures can be better realized. In the embodiment that the fixing portion 32 includes the extending structure 324 and a gap is left between the extending structure 324 and the elastic pressing portion 31, the extending structure 324 may be disposed between the two elastic pressing portions 31 and a gap is left between the two elastic pressing portions 31, so as to increase the elastic deformation capability of the elastic pressing portion 31 to a greater extent.

Preferably, the fixing portion 32 and the elastic pressing portion 31 are respectively strip-shaped sheet structures, as shown in fig. 5, the extending direction of the fixing portion 32 may be perpendicular to the opposite direction X, and the extending direction of the elastic pressing portion 31 is parallel to the opposite direction X, so that the deformation capability of the elastic pressing member 30 can be further increased.

Specifically, the elastic pressing portion 31 protrudes toward the side where the circuit board 40 is located, for example, the elastic pressing portion 31 has an arch shape or an arc shape, so that the protruding portion can generate a larger pressing force on the third electrical connection structure. Further, the elastic pressing portion 31 includes a plane section 311 disposed opposite to the third electrical connection structure and connection sections 312 connected to two ends of the plane section 311, and the elastic pressing portion 31 is connected to the fixing portion 32 through the connection sections 311; the plane section 311 applies an elastic force to the third electrical connection structure, so that the elastic pressing portion 31 and the circuit board 40 are better in press fit. Wherein, linkage segment 312 is the curved structure, and with the smooth transition between the plane section 311 be connected, this kind of structure can make elasticity portion 32 compress tightly circuit board 40, connector 50 and DMD device 60 better on the one hand, and on the other hand also can guarantee the structural strength that elasticity compressed tightly piece 30, prolongs its life to improve overall structure's reliability.

More preferably, in the corresponding set of planar segment 311 and the third electrical connection structure, along the thickness direction Y of DMD device 60, the projection of the third electrical connection structure is located within the projection edge of planar segment 311, i.e. planar segment 311 covers the third electrical connection structure, so that planar segment 311 can substantially apply the same pressure to each third contact of the third electrical connection structure, thereby further improving the reliability of the contact of the first contact, the second contact and the third contact. Of course, the plane section 311 may not cover the third electrical connection structure.

The protruding direction of the limiting boss 22 may form an included angle with the thickness direction Y, such a structure is inconvenient for the installation of the elastic pressing member 30, and may increase the processing difficulty, and preferably, the protruding defensive line of the limiting boss 22 is parallel with respect to the thickness direction Y.

The position-limiting projection 22 corresponding to the first position-limiting slot hole 321 and the position-limiting projection 22 corresponding to the second position-limiting slot hole 322 may be of the same structure or of different structures, and preferably, the same structure is used for manufacturing. Specifically, the limiting boss 22 can be a prism structure, a cylinder structure, a conical boss or other special-shaped bosses, and if the limiting boss 22 is a prism or other special-shaped structures, a plurality of limiting surfaces can be formed on the side wall of the limiting boss 22, so that the elastic pressing piece 30 can be limited to slide, the elastic deformation of the elastic pressing portion 31 is affected, and the assembly precision requirement of the structure on the processing and the later stage is higher, and the cost is not reduced. In order to solve the above technical problem, in a preferred embodiment, the limiting boss 22 is a cylindrical structure, as shown in fig. 4 and 5, the inner wall of the limiting slot hole is a smooth surface, that is, the inner wall of the limiting slot hole may include a plane and an arc surface, or may include only an arc surface, or other curved surfaces with smooth surfaces, as shown in fig. 5, the inner wall of the first limiting slot hole 321 includes two planes oppositely arranged and an arc surface connecting the two planes, and the inner wall of the second limiting slot hole 322 is a cylindrical surface.

However, in this way, when the inner wall of the limiting slot hole is a closed ring structure, the installation cannot be performed, and the limiting slot holes must be correspondingly configured to penetrate through the inner edge or the outer edge of the fixing portion 32, even if only the first limiting slot hole 321 is a strip-shaped groove penetrating through the edge of the fixing portion 32, the limiting boss 22 corresponding to the first limiting slot hole 321 is fixedly connected to the anti-disengaging structure 81, which is very inconvenient in installation. In order to facilitate installation and processing, the anti-disengaging structure 81 and the fixing seat 20 are separate structures, and the two structures can be connected in a threaded connection mode, a clamping connection mode, a riveting connection mode and the like.

In a preferred embodiment, the DMD assembly further comprises a locking member 80, and the locking member 80 comprises a locking structure 82 and a retaining structure 81 connected to each other, i.e. the retaining structure 81 is formed on the locking member 80. In this embodiment, the locking hole 221 is formed in the limiting boss 22, the locking structure 81 is detachably connected with the locking hole 82, and when the elastic pressing member 30 is installed, the locking member 80 can be detached first, so that the elastic pressing member 30 can be directly inserted into the limiting boss 22, and the elastic pressing member 30 cannot deform in the installation process, so that the elastic force of the elastic pressing member 30 can be ensured, and after the elastic pressing member 30 is installed, the locking member 80 is locked with the limiting boss 22 to prevent the elastic pressing member 30 from falling off; and through the detachable connection arrangement of the locking member 80 and the limiting boss 22, the elastic pressing member 30 is convenient to disassemble and assemble when needing to be adjusted, maintained or replaced subsequently. Wherein, retaining member 81 and spacing boss 22 can be connected through modes such as threaded connection or joint, and preferably, retaining member 80 can be screw or bolt, as shown in fig. 5, the head of screw or bolt forms anti-disengaging structure 81, and the double-screw bolt forms locking structure 82, adopts this kind of mode, and screw or bolt are easily purchased, and the cost is lower to can reduce whole electronic equipment's manufacturing cost, and convenient assembly.

With continued reference to fig. 3-5, the main body 21 is provided with a groove 211, that is, the surface of the fixing base 20 facing the circuit board 40 is provided with the groove 211, and the groove 211 may be formed by a surface of the main body 21 facing the circuit board 40 being concave. The limiting boss 22 is disposed on the bottom surface of the recess 211, and the height of the limiting boss 22 is smaller than the depth of the recess 211, that is, the end of the limiting boss 22 does not exceed the recess 211, in this embodiment, the elastic pressing member 30 partially protrudes out of the recess 211 in the free state, specifically, the fixing portion 321 is installed in the recess 211, and the elastic pressing portion 31 at least partially protrudes out of the recess 211 in the free state. With the above structure, on one hand, more elastic space can be provided for the elastic pressing piece 30 by arranging the groove 211, so that the pressing effect on the circuit board 40, the connector 50 and the DMD device 60 can be improved; on the other hand, the height of the limiting boss 22 is smaller than the depth of the groove 211, so that the limiting boss 22 and the anti-disengaging structure 81 cannot touch the circuit board 40 to influence the deformation of the elastic pressing piece 30 as far as possible in the process of locking the fixing base 20 and the base 10; on the other hand, by providing the groove 211, the thickness (i.e., the dimension in the Y direction) of the entire DMD assembly can also be reduced while ensuring the same elastic deformation of the elastic pressing member 30.

In an embodiment, the anti-separation structure 81 does not protrude out of the groove 211, so as to further reduce the influence of the limiting projection 22 and the anti-separation structure 81 on the deformation of the elastic pressing member 30 during the locking process of the fixing base 20 and the base 10. However, this will certainly require the great degree of depth of recess 211 just can, so, then influence whole fixing base 20's intensity, to this problem, retaining structure 81 can stretch out recess 211 slightly, and retaining structure 81 part stretches out recess 211 promptly, and the part is located recess 211 to can enough avoid spacing boss 22 and retaining structure 81 to the influence of elasticity pressing member 30 deformation at the in-process of fixing base 20 with base body 10 locking, can guarantee fixing base 20's structural strength again.

Specifically, the fixing base 20 may be configured as any structure capable of achieving the above functions, such as a block structure or an irregular shell structure, and in order to make the structure more compact, preferably, as shown in fig. 3 to 5, the fixing base 20 is in an elongated plate-shaped structure, and two opposite surfaces of the elongated plate-shaped structure with the largest area are respectively defined as a first side surface and a second side surface (i.e., a surface where the groove 211 is disposed). The groove 211 is formed in the middle of the fixed seat 20 in the extending direction of the fixed seat, as shown in fig. 5, the two side structures of the fixed seat 20 are used for being matched with the base body 10, the arrangement mode is more reasonable in structure, the assembly is more convenient, and the overall structure after the assembly is more reliable. As shown in fig. 5, in the embodiment, mounting holes 23 may be formed at the edge of the fixing base 20, for example, mounting holes 23 are formed at four corners of the fixing base 20, and the fixing base 20 is fixedly fastened to the base 10 by a first fastening member 91 through the mounting holes 23. Further preferably, as shown in fig. 2 and 5, corner-lacking grooves 24 are formed in four corners of the first side surface of the fixing base 20, the mounting holes 23 are formed in the corner-lacking grooves 24, the corner-lacking grooves 24 mean that the shape of the grooves is a corner-lacking structure, the grooves can be formed by inward recess of the first side surface and extend to the edge of the fixing base 20, and the mounting space of the first fastening piece 91 can be increased due to the arrangement, so that the mounting and dismounting convenience of the first fastening piece 91 is improved, and the size of the DMD assembly in the thickness direction Y is reduced.

Preferably, in order to improve the installation efficiency, the fixing base 20 is provided with a positioning structure, specifically, the positioning structure can be provided on the main body 21 for positioning the fixing base 20 on the base 10, the positioning structure can be, for example, a positioning post, a positioning plate, and the like, in a preferred embodiment, as shown in fig. 3-5, the positioning structure includes a positioning hole 212 provided on one side of the recess 211 and a positioning through slot 213 provided on the other side of the recess 211, the positioning hole 212 can be a circular hole, the positioning through slot 213 is a slot penetrating through the thickness direction (i.e., Y direction) of the main body 21 and is respectively used for matching with a structure on the base 10, for example, as shown in fig. 6, the base 10 is provided with two positioning posts 11, one of the positioning posts 11 is matched and positioned with the positioning through slot 212, so that the positioning hole 212 is used as a main positioning structure, and the positioning through slot 213 is, the function of compensating and adjusting the processing deviation is achieved. In addition, the positioning through groove 213 may be replaced with a structure such as a kidney-shaped hole, as long as the function of compensating and adjusting the machining deviation is achieved. Of course, it can be understood that the positioning structures may be positioning holes or positioning through grooves.

Since the connector 50 and the DMD device 60 generate heat seriously, in order to conduct the heat as soon as possible, the DMD assembly further includes a heat dissipating member 100, the heat dissipating member 100 includes a heat dissipating portion 110 and a heat transfer portion 120, the heat dissipating portion 110 may be mounted on the first side surface of the fixing base 20 by the second fastening member 92, and the heat transfer portion 120 passes through the fixing base 20, the elastic pressing member 30 and the circuit board 40, and contacts with the connector 50 by the heat conducting pad 200, so as to conduct the heat on the connector 50 and the DMD device 60. The number of the second fastening members 92 may be one, or two or more, and preferably, two second fastening members 92 are provided.

The heat dissipating part 110 may have any structure for dissipating heat, for example, in the embodiment shown in fig. 2, the heat dissipating part 110 includes a connecting plate 111 and a plurality of heat dissipating fins 112 disposed on the connecting plate 111, and the connecting plate 111 is used for carrying the heat dissipating fins 112 and the heat transferring part 120, and is used for connecting with the fixing base 20. Specifically, the connection plate 111 includes opposite surfaces, one of which is provided with the heat dissipation fins 112, and the other of which is provided with the heat transfer portion 120. The fins 112 are disposed at an angle to the connection plate 111, preferably perpendicular to each other. The surface of the connection plate 111 where the heat transfer portion 120 is disposed is opposite to the first side surface of the holder 20. In order to ensure as large a heat dissipation area as possible, it is preferable that the edge profile of the connection plate 111 is substantially the same as the edge profile of the holder 20.

The first fastening member 91 and the second fastening member 92 are screws, rivets, pins, or other structural members capable of being fastened and connected, and preferably, the first fastening member 91 and the second fastening member 92 are both screws for facilitating disassembly and assembly.

In order to further improve the connection reliability of the heat sink 100 and the fixing base 20, it is preferable that an elastic member, such as a leaf spring or a coil spring 93 as shown in fig. 2, is provided between the second fastening member 92 and the heat sink 110, and the coil spring 93 is preferable in view of the easy setting and control of the elastic force of the coil spring 93, so that the elastic force of the coil spring 93 and the pressure applied by the controller are selected according to the pressure range that the DMD device 60 can withstand.

Since the DMD device 60 is very sensitive to impurities such as dust and moisture, the DMD assembly further includes a sealing member 70, in a specific embodiment, as shown in fig. 2 and 6, the sealing member 70 includes a sealing sheet 71 and a sealing ring 72, wherein the sealing sheet 71 is disposed between the pressing structure 30 and the circuit board 40, in the embodiment where the heat transfer portion 120 is disposed, a through hole 711 is disposed on the sealing sheet 71 for the heat transfer portion 120 to pass through, and the through hole 711 is in interference fit with the heat transfer portion 120 to seal the outer periphery of the heat transfer portion 120, and further, the outer edge of the sealing sheet 71 extends out of the outer edge of the circuit board 40 to seal the outer side of the circuit board 40. The sealing ring 72 is disposed around the outer edge of the connector 60 and attached to the side of the circuit board 40 facing the connector 60, and in order to increase the tightness of the seal, a part of the outer edge of the sealing ring 71 extends out of the circuit board 40, so that when the fixing base 20 is locked with the base 10, the sealing ring 71 is pressed, and the sealing ring 71 can be attached to a part of the side wall of the circuit board 40. In this manner, the sealing of the circuit board 40 and the connector 50 is achieved by the cooperation of the sealing sheet 71 and the sealing ring 72.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.

Claims (12)

1. A DMD assembly of a projection optical machine comprises a fixed seat (20), an elastic pressing piece (30), a circuit board (40), a connector (50) and a DMD device (60), wherein the DMD device (60) is provided with a first electric connection structure (61), and the first electric connection structure (61) comprises a plurality of first contacts; the connector (50) is provided with a second electrical connection structure (51), the second electrical connection structure (51) comprising a plurality of second contacts; the circuit board (40) is provided with a third electrical connection structure, and the third electrical connection structure comprises a plurality of third contacts; the fixing seat (20) is used for fixing the circuit board (40), the connector (50) and the DMD device (60) on a base body (10) so as to press the third electrical connection structure, the second electrical connection structure (51) and the first electrical connection structure (61) through the elastic pressing piece (30) to realize the electrical connection of the corresponding first contact, the second contact and the third contact; it is characterized in that the preparation method is characterized in that,

the elastic pressing piece (30) comprises two fixing parts (32) which are oppositely arranged and an elastic pressing part (31) which is connected with the two fixing parts (32), each fixing part (32) is provided with a limiting slotted hole, and the limiting slotted hole on at least one fixing part (32) extends along the opposite direction of the two fixing parts (32); the elastic pressing part (31) is pressed against the circuit board (40);

the fixing seat (20) comprises a body part (21) and a limiting boss (22) which is arranged on the body part (21) in a protruding mode, an anti-disengaging structure (81) is arranged at one end, far away from the body part, of the limiting boss (22), and the anti-disengaging structure (81) extends out of the outer edge of the limiting boss (22) in the direction perpendicular to the thickness direction of the DMD device;

the limiting groove holes are correspondingly inserted and matched with the limiting bosses (22), the fixing parts (32) are located between the body part (21) and the anti-falling structures (81), and the limiting bosses (22) extend out of the surfaces, facing the circuit board (40), of the fixing parts (32) where the limiting bosses are located, so that intervals are reserved between the fixing parts (32) and the anti-falling structures (81).

2. The DMD assembly of claim 1, wherein the retaining slot in one of the anchors (32) is a slotted hole extending in the opposite direction; the limiting groove hole on the other fixing part (32) is consistent with the outer contour of the limiting boss (22).

3. The DMD assembly of claim 2, wherein the slotted holes are slots extending in the opposite direction and penetrating to the inner edges of the two holding portions (32) opposite to each other.

4. A DMD assembly according to claim 3, wherein the fixation part (32) comprises a connecting structure (323) connecting the resilient compression parts (31) and an extension structure (324), the extension structure (324) extending from an inner edge of the connecting structure (323) to the opposite fixation part (32), the extension structure (324) forming a gap with the resilient compression parts (31); on the fixed part (32) provided with the strip-shaped groove, the strip-shaped groove extends from the connecting structure (323) and penetrates through the extending structure (324).

5. The DMD assembly of claim 4, wherein the extension structure (324) comprises an extension section (3241) connected to the connecting structure (323) and a bending section (3242) connected to an end of the extension section (3241), the bending section (3242) being bent to a side of the circuit board (40) with respect to the extension section (3241); the height of the limiting boss (22) is larger than the size of the connecting structure (323) and the extension section (3241) in the thickness direction of the DMD device (60).

6. The DMD assembly according to claim 3, characterized in that said fixing portion (32) and said elastic pressing portion (31) are provided in two, respectively strip-shaped sheet structures, and in that said two fixing portions (32) and said two elastic pressing portions (31) are arranged at intervals and are connected end to end in sequence;

the first electrical connection structure (61), the second electrical connection structure (51) and the third electrical connection structure are correspondingly provided with two groups, and the two groups correspond to the two elastic pressing parts (31).

7. The DMD assembly according to claim 6, characterized in that the elastic pressing part (31) comprises a plane section (311) opposite to the third electrical connection structure and a connection section (312) connected to both ends of the plane section (311), the elastic pressing part (31) being connected to the fixing part (32) through the connection section (312); in a corresponding set of the planar segment (311) and the third electrical connection structure, along the thickness direction of the DMD device (60), a projection of the third electrical connection structure is located within a projection edge of the planar segment (311).

8. The DMD assembly according to claim 7, wherein, in the thickness direction of the DMD device (60), the projection of the third electrical connection structure is located within the projected edge of the planar section (311).

9. The DMD assembly according to claim 1, wherein the limiting boss (22) is of cylindrical structure; the inner wall of the limit slotted hole arranged in an extending mode comprises two planes arranged oppositely and an arc surface for connecting the two planes.

10. DMD assembly according to any of claims 1-9, characterised in that the stop boss (22) is provided with locking holes (221); still include retaining member (80), retaining member (80) including interconnect's locking structure (82) with anti-disengaging structure (81), locking structure (82) with locking hole (221) screw-thread fit.

11. The DMD assembly according to any one of claims 1 to 9, wherein the body portion (21) is provided with a recess (211), the stopper boss (22) is provided at a bottom surface of the recess (211) and has a height smaller than a depth of the recess (211); the elastic pressing piece (30) partially extends out of the groove (211) in a free state.

12. Projection light engine, characterized in that it comprises a base body (10) and a DMD assembly according to any one of claims 1 to 11, said DMD assembly being mounted to said base body (10) by means of said holders (20).

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