Light-transmitting structure of TOF module cover plate, TOF module cover plate and device

Abstract

The utility model discloses a light-transmitting structure of a TOF module cover plate, the TOF module cover plate and a device. The light-transmitting structure at least comprises a light-transmitting hole formed in the cover plate, a glue groove in the cover plate, and a light filter fixed below the light-transmitting hole through glue dispensing of the glue groove. Wherein a first retaining wall is arranged on the periphery of the light hole facing the inner side of the cover plate, a second retaining wall and a third retaining wall respectively extend along two ends of the first retaining wall, and an exhaust groove is formed in the inner sides of the two retaining walls; the optical filter is attached to the surface of each retaining wall, so that one end of the exhaust groove is communicated with the boss type light hole, and the other end of the exhaust groove is communicated with the interior of the device; the glue groove is arranged in the sinking area on the outer side of the retaining wall and comprises a first glue groove, a second glue groove and a third glue groove which are the same in depth, so that the adhesion point of the optical filter in the glue groove is in a stable triangle shape. According to the light-transmitting structure, the light-transmitting hole is designed to be of a boss type structure, so that the area of the exhaust groove is reduced, the risk that external gas and liquid enter is reduced, and meanwhile the stability of the optical filter is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to TOF module packaging technical field, concretely relates to a kind of light-transmitting structure of TOF module cover plate, TOF module cover plate and device. BACKGROUND

[0002] Time Of Flight (TOF), is through the time interval t (often referred to as pulse ranging method) of the pulse signal of the measuring instrument from transmission to reception or the phase (phase difference ranging method) generated by laser to and fro measured object once to realize the distance measurement between measured object (or measured object detection area) and sensor.DTOF (Direct TOF), namely direct measurement of time of flight, measures the time interval of transmission pulse and reception pulse to measure the distance of target object.

[0003] Figure 1 As shown in a single-chip TOF packaging structure, including substrate 2, light receiving chip 4 attached on substrate 2, bonding wire 3 for signal transmission, filter 102 above chip for filtering light, cover plate 1 for protecting internal structure.It has a light-transmitting hole 101 on the cover plate 1, for receiving reflected light, reflected light is filtered by filter 102 and transmitted to light receiving chip 4.Cover plate 1 is provided with glue groove 103, filter 102 is fixed with cover plate 1 by glue in glue groove 103, there is a retaining wall 104 between glue groove 103 and light-transmitting hole 101 in cover plate 1, the outside is used to block the glue, the inside and filter 102 form exhaust groove 105, for exhaust, to prevent the product from exploding due to the expansion of gas caused by heat.

[0004] However, as Figure 2 As shown in the prior art, the exhaust groove 105 and the light-transmitting hole 101 are in a unified plane, and the exhaust groove 105 is relatively large due to the relative width of the light-transmitting hole 101 and the glue retaining wall 104, and there are two exhaust groove openings 1051 in front and back, which can increase the internal exhaust area, but also increases the risk of external gas and liquid entering, and the internal components are more susceptible to pollution and erosion, resulting in failure. SUMMARY

[0005] To solve the above problems, the utility model discloses a kind of light-transmitting structure of TOF module cover plate, TOF module cover plate and device, by the light-transmitting hole is designed as boss type structure to reduce the size of exhaust groove, reduce the number of exhaust groove opening, to reduce the risk of external gas and liquid entering, while increasing the stability of filter.

[0006] To achieve the above object, the utility model takes the following technical solutions:

[0007] The utility model discloses a first aspect provides a kind of TOF module cover plate's light transmission structure, at least including being set up on the light transmission hole of cover plate, set up in the glue groove of cover plate inside, and the filter fixed below light transmission hole by glue groove point, wherein, in the light transmission hole peripheral place of inside of cover plate is set with first retaining wall, so that the light transmission hole forms boss type structure;Second retaining wall and third retaining wall are respectively extended out along the two ends of the first retaining wall, and the inside of the second retaining wall and third retaining wall constitutes a exhaust groove;The filter is attached with the surface of the first retaining wall, second retaining wall and third retaining wall, so that one end of the exhaust groove is communicated with the light transmission hole of boss type, and the other end is communicated with module device inside, to discharge gas in module device inside;The glue groove is set in the subsided area of the first retaining wall, second retaining wall and third retaining wall outside, and it at least includes the first glue groove, second glue groove and third glue groove of same depth, so that the sticking point of the filter in glue groove is in the stable triangle of tendency.

[0008] Preferably, the depth of the exhaust groove is consistent with the depth of the glue groove.

[0009] Preferably, the second retaining wall and the third retaining wall are arranged in parallel.

[0010] Preferably, the second glue groove and the third glue groove are communicated, and a fourth retaining wall is arranged between the second glue groove, the third glue groove and the first glue groove.

[0011] Preferably, the first retaining wall, the second retaining wall, the third retaining wall and the fourth retaining wall are in the same horizontal plane.

[0012] Preferably, the shape of the light transmission hole is circular, and the first retaining wall is in the shape of a circular arc.

[0013] Preferably, the fourth retaining wall is arranged in the shape of a circular arc in parallel with the first retaining wall, and the second glue groove and the third glue groove are communicated through the gap between the fourth retaining wall and the first retaining wall.

[0014] The utility model discloses a second aspect provides a kind of TOF module cover plate, it includes above-mentioned light transmission structure.

[0015] The utility model discloses a third aspect provides a kind of TOF module device, it includes substrate, chip component and above-mentioned cover plate, the substrate and the cover plate encapsulation form cavity, the chip component is installed on the substrate, and is housed in the cavity.

[0016] Compared with the prior art, the light transmission structure of the utility model has the following beneficial effects:

[0017] (1) The utility model discloses a convex post type light transmission hole (including but not limited to the shape of convex post, the shape of light transmission hole) not only reduces the size of exhaust groove but also reduces the quantity of exhaust groove, thereby reduce the area of the passage of external gas or liquid, reduce the amount of external gas or liquid, reduce the risk degree of erosion of the internal chip assembly of device.

[0018] (2) The utility model discloses a light transmission hole retaining wall and exhaust groove retaining wall reconstruct filter piece carrying platform, the space of the sinking of the upper and lower sides of exhaust groove retaining wall can be used as glue groove and is used for dispensing and pasting filter piece, makes filter piece sticking point present triangular situation, improves the adhesion, thereby reduces the risk of filter piece falling, improves the reliability of product. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a TOF module packaging structure schematic diagram of prior art single chip;

[0020] Figure 2 It is a light transmission structure schematic diagram of prior art TOF module cover plate;

[0021] Figure 3 It is a light transmission structure schematic diagram of the utility model embodiment TOF module cover plate;

[0022] Figure 4 It is Figure 3 It is a structure schematic diagram after removing filter piece;

[0023] Figure 5 It is a light transmission structure assembly method and principle schematic diagram of the utility model embodiment TOF module cover plate.

[0024] Wherein: 1, cover plate;101, light transmission hole;102, filter piece;103, glue groove;1031, first glue groove;1032, second glue groove;1033, third glue groove;104, retaining wall;1041, first retaining wall;1042, second retaining wall, 1043, third retaining wall;1044, fourth retaining wall;105, exhaust groove;1051, exhaust groove opening;2, substrate;3, bonding wire;4, light receiving chip. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is combined with the embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0026] In the description of the utility model, need understanding is, the term "upper", "lower", "front", "back", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or element that the indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the restriction of the utility model, such as "first" and "second" and so on relationship terms only use to distinguish one entity or operation with another entity or operation, and not necessarily require or imply that there is any such actual relationship or order between these entities or operations.

[0027] In the description of the utility model, need to explain is, unless otherwise definite and limited, the term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, integrally connected, also can be detachable connection, can be the intercommunication of two elements inside, can be direct connection, also can be indirectly connected through the intermediate medium, for the ordinary skill in the art, can understand the specific meaning of the above-mentioned term in the utility model with specific circumstances.

[0028] As Figure 3 And Figure 4As shown, the utility model discloses a kind of light-transmitting structure of TOF module cover plate, it at least includes the light-transmitting hole 101 being opened in cover plate 1, the glue groove 103 being opened in the inside of cover plate 1, and the optical filter 102 being fixed below light-transmitting hole 101 by glue groove 103 point glue.Outside the periphery of light-transmitting hole 101 towards the inside of cover plate 1 is provided with first retaining wall 1041, so that light-transmitting hole 101 forms boss type structure, second retaining wall 1042 and third retaining wall 1043 are extended out along the two ends of first retaining wall 1041 in parallel, and the inside of second retaining wall 1042 and third retaining wall 1043 constitutes a exhaust groove 105.Optical filter 102 is attached with the surface of first retaining wall 1041, second retaining wall 1042 and third retaining wall 1043, so that one end of exhaust groove 105 is communicated with boss type light-transmitting hole 101, and the other end is communicated with module device inside, to discharge gas in TOF module device inside, prevent device from explosion due to gas expansion by heat.It needs to be explained, in the embodiment, since first retaining wall 1041 is arranged at the periphery of light-transmitting hole 101, and then second retaining wall 1042 and third retaining wall 1043 are extended out from first retaining wall 1041, the size of exhaust groove 105 can be controlled by controlling the distance between second retaining wall 1042 and third retaining wall 1043, so that exhaust groove 105 is reduced in limited space, and the number of exhaust groove opening 1051 is changed from two to one in tradition, while guaranteeing effective exhaust, reduce the passing area of external gas and liquid, reduce the amount of external gas or liquid, to reduce the risk of chip assembly in device inside being eroded.It should be understood that, in the embodiment, the shape of light-transmitting hole 101 includes but is not limited to circular, and correspondingly, the shape of first retaining wall 1041 includes but is not limited to circular arc;Similarly, second retaining wall 1042 and third retaining wall 1043 include but are not limited to parallel arrangement, and the shape of both also includes but is not limited to straight line.

[0029] Further, glue groove 103 is arranged in the sunken area outside first retaining wall 1041, second retaining wall 1042 and third retaining wall 1043, and it at least includes first glue groove 1031, second glue groove 1032 and third glue groove 1033 with same depth. Figure 5 As shown in C in the above, when optical filter 102 is attached to cover plate 1, a suitable amount of glue is respectively point into the above three glue grooves 103 by using fixed crystal machine and other tools, so that optical filter 102 can be stably carried on the platform constructed by first retaining wall 1041 at the periphery of light filter hole 101 and second retaining wall 1042 and third retaining wall 1043 on both sides of exhaust groove 105, and the adhesion force suffered by optical filter 102 presents triangular shape, with more stable structure.

[0030] Specifically, as shown in Figure 3 And Figure 4As shown, in the embodiment, the first glue groove 1031 is located outside the first retaining wall 1041, the second glue groove 1032 is located outside the second retaining wall 1042, the third glue groove 1033 is located outside the third retaining wall 1043, and the fourth retaining wall 1044 is arranged between the second glue groove 1032 and the third glue groove 1033 and the first glue groove 1031. Wherein, the fourth retaining wall 1044 is arranged in a circular arc shape parallel to the first retaining wall 1041, and the gap between the fourth retaining wall 1044 and the first retaining wall 1041 communicates the second glue groove 1032 and the third glue groove 1033. Through the above structure, the three glue grooves 103 are effectively blocked, so that the position of the glue added during dispensing is more clear and explicit, and the overflow and uneven dispensing caused by the flow of glue between different glue grooves 103 are avoided. In addition, the fourth retaining wall 1044 further provides support for the mounting of the optical filter 102. The first retaining wall 1041, the second retaining wall 1042, the third retaining wall 1043 and the fourth retaining wall 1044 are in the same horizontal plane, and as an optimization, the shapes are all square bosses, so that the mounting of the optical filter 102 is more stable, but they can also adopt other shapes in the prior art. It should be noted that in the embodiment, the depth of the glue groove 103 is consistent with the depth of the exhaust groove 105, but in actual production, the depth of the exhaust groove 105 and the glue groove 103 can be adjusted as needed, and they can not be the same.

[0031] The assembly method and principle of the light transmission structure of the embodiment are further described below, as follows Figure 5 As shown, the specific steps include the following steps:

[0032] S1, the cover plate 1 containing the above light transmission structure is inverted and clamped on the tool jig, that is, the glue groove 103 faces upward, preparing for dispensing glue in the glue groove 103 (A in the figure); Figure 5

[0033] S2, the die bonder is used to dispense an appropriate amount of glue in the first glue groove 1031, the second glue groove 1032 and the third glue groove 1033, and the amount of glue is controlled by the machine, so that the dispensing part forms a triangular shape (B in the figure); Figure 5

[0034] S3, the optical filter 102 is mounted on the cover plate 1, and the optical filter 102 is respectively attached to the first retaining wall 1041, the second retaining wall 1042, the third retaining wall 1043 and the fourth retaining wall 1044, thereby stably riding on the platform constructed by the boss type light transmission hole 101 and the retaining wall 104 of the exhaust groove 105, and the adhesive force received presents a triangular shape, and has a more stable structure (C in the figure); Figure 5

[0035] ​​​S4, after the filter 102 is installed, the area of the exhaust groove 105 becomes smaller, the exhaust groove opening 1051 changes from two to one, one end of the exhaust groove 105 is in communication with the convex light transmission hole 101, and the other end is in communication with the inside of the device, which can reduce the area of the external water vapor and liquid passing through (D) in the specification. Figure 5 S4, after the filter 102 is installed, the area of the exhaust groove 105 becomes smaller, the exhaust groove opening 1051 changes from two to one, one end of the exhaust groove 105 is in communication with the convex light transmission hole 101, and the other end is in communication with the inside of the device, which can reduce the area of the external water vapor and liquid

Claims

1. A light-transmitting structure of a TOF module cover plate, comprising at least a light-transmitting hole (101) formed on the cover plate (1), a glue groove (103) formed inside the cover plate (1), and a filter (102) fixed below the light-transmitting hole (101) by glue through the glue groove (103), characterized in that, a first barrier wall (1041) is arranged at the periphery of the light-transmitting hole (101) towards the inside of the cover plate (1), so that the light-transmitting hole (101) forms a boss structure; a second barrier wall (1042) and a third barrier wall (1043) are respectively extended from both ends of the first barrier wall (1041), and the inner sides of the second barrier wall (1042) and the third barrier wall (1043) form an exhaust groove (105); the filter (102) is attached to the surfaces of the first barrier wall (1041), the second barrier wall (1042) and the third barrier wall (1043), so that one end of the exhaust groove (105) is in communication with the boss-type light-transmitting hole (101), and the other end is in communication with the inside of the module device, to exhaust the gas inside the module device; the glue groove (103) is arranged in a sunken area outside the first barrier wall (1041), the second barrier wall (1042) and the third barrier wall (1043), and at least comprises a first glue groove (1031), a second glue groove (1032) and a third glue groove (1033) with the same depth, so that the sticking points of the filter (102) in the glue groove (103) form a stable triangular shape. The depth of the exhaust groove (105) is consistent with the depth of the glue groove (103). The second barrier wall (1042) and the third barrier wall (1043) are arranged in parallel. 2.The light-transmitting structure of a TOF module cover plate according to claim 1, wherein, The second glue groove (1032) and the third glue groove (1033) are in communication, and a fourth barrier wall (1044) is arranged between the second glue groove (1032), the third glue groove (1033) and the first glue groove (1031). 3.The light-transmitting structure of a TOF module cover plate according to claim 1, wherein, The first barrier wall (1041), the second barrier wall (1042), the third barrier wall (1043) and the fourth barrier wall (1044) are in the same horizontal plane. 4.The light-transmitting structure of a TOF module cover plate according to claim 1, wherein, The shape of the light-transmitting hole (101) is circular, and the first barrier wall (1041) is in the shape of a circular arc. 5.The light-transmitting structure of a TOF module cover plate according to claim 4, wherein, The fourth barrier wall (1044) is arranged in the shape of a circular arc in parallel with the first barrier wall (1041), and the second glue groove (1032) and the third glue groove (1033) are in communication through the gap between the fourth barrier wall (1044) and the first barrier wall (1041). 6.The light-transmitting structure of a TOF module cover plate according to claim 5, wherein, The light-transmitting structure according to any one of claims 1-7.

7. The light-transmitting structure of the TOF module cover plate according to claim 6, characterized in that, The cover plate (1) according to claim 8, a substrate (2) and a chip assembly, wherein the substrate (2) and the cover plate (1) form a cavity, and the chip assembly is mounted on the substrate (2) and accommodated in the cavity. 8.A TOF module cover plate, characterized in that, ​ 9. A TOF module device, characterized in that, ​

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