阅读说明：本技术 一种发射用的宽带声表面波滤波器 (Wideband surface acoustic wave filter for transmission ) 是由 王阳 陆彬 于 2020-05-09 设计创作，主要内容包括：本发明实施例公开了一种发射用的宽带声表面波滤波器,包括围罩,在所述围罩内设置有基板,所述基板的外侧覆盖安装有与围罩内壁连接的塑封胶,且所述基板远离塑封胶的一侧表面开设有安装槽,所述安装槽的内壁安装有芯片,且所述安装槽在远离塑封胶的一侧开设有横截面呈八字形结构的斜槽,本发明可通过初封斜套对贴合的盖板和基板进行初次密封固定,即使盖板与基板贴合处存在缝隙,填充的塑封胶也不会轻易渗入金属电极区域,且在盖板与基板贴合好后,可在插套孔内插入紧密套,使得两者之间不会存在间隙,由此提高两者密封性,且本发明还可通过防扯条,对盖板与基板进行定位,防止塑封胶填充不均匀从而将一侧基板胀开的情况发生。(The embodiment of the invention discloses a broadband surface acoustic wave filter for emission, which comprises an enclosure, wherein a substrate is arranged in the enclosure, the outer side of the substrate is covered and provided with plastic packaging adhesive connected with the inner wall of the enclosure, the surface of one side of the substrate, which is far away from the plastic packaging adhesive, is provided with a mounting groove, the inner wall of the mounting groove is provided with a chip, and the side, which is far away from the plastic packaging adhesive, of the mounting groove is provided with a chute with a splayed cross section. The situation that the plastic package glue is filled unevenly so that the substrate on one side is expanded is prevented.)

1. A wideband surface acoustic wave filter for transmission, comprising an enclosure (1), a base plate (2) is arranged in the enclosure (1), the outer side of the base plate (2) is covered and installed with a plastic sealant (3) connected with the inner wall of the enclosure (1), and a mounting groove (201) is arranged on the surface of one side of the substrate (2) far away from the plastic sealant (3), a chip (4) is arranged on the inner wall of the mounting groove (201), and one side of the mounting groove (201) far away from the plastic sealing glue (3) is provided with a chute (202) with a splayed cross section, a metal electrode (5) is arranged on the surface of the chip (4), a cover plate (6) connected with the inner wall of the chute (202) is arranged on one side of the metal electrode (5) far away from the chip (4), a sleeve sealing component (7) is arranged between the cover plate (6) and the base plate (2);

the cover seals subassembly (7) including installing laminating cover ring (701) at chute (202) inner wall, screens groove (203) have been seted up to the lateral wall of base plate (2) the surface mounting of laminating cover ring (701) has just sealed inclined sleeve (702), inclined sleeve caulking groove (601) have been seted up to the surface of apron (6) and just sealed inclined sleeve (702) corresponding position department, plug bush hole (204) have been seted up to the inner wall of screens groove (203), plug bush caulking groove (602) have been seted up to the surface of apron (6) and plug bush hole (204) corresponding position department the tight cover (602) of tip extension in plug bush caulking groove (602) are connected in plug bush hole (204), tight strip (8) are installed to the inside wall of plug bush caulking groove (602), the lateral wall of tight cover (703) has cup jointed the gum cover (704) of hugging closely of being connected with tight strip (8).

2. The wideband surface acoustic wave filter for transmission as claimed in claim 1, wherein said tight strip (8) is composed of a block (801) connected to the inner side wall of the insert pocket (602) and several tight blocks (802) installed on the surface of the block (801), and the surface of the primary sealing inclined sleeve (702) is provided with an arc-shaped anti-drop groove (705).

3. The broadband surface acoustic wave filter for emission according to claim 1, wherein the cross section of the tight sleeve (703) is in a square structure, a pulling block (9) connected with the inner wall of the clamping groove (203) is installed in the tight sleeve (703), the pulling block (9) comprises a pressing pull sheet (901) installed on the inner wall of the tight sleeve (703), a fixing sheet (902) with an L-shaped cross section is installed at one end of the pressing pull sheet (901) far away from the tight sleeve (703), and the width of the fixing sheet (902) is greater than that of the pressing pull sheet (901).

4. The broadband surface acoustic wave filter for emission according to claim 1, wherein the cover plate (6) comprises a main cover plate (603) connected to the inclined groove (202), a sub cover plate (604) is surface-mounted on one side of the main cover plate (603) far away from the substrate (2), a sealing cover plate (605) is mounted on one side of the sub cover plate (604) far away from the main cover plate (603), a pressing ring (606) is sleeved on a side wall of the sub cover plate (604), and a pressing piece (607) connected to the fixing piece (902) is mounted on an inner side wall of the pressing ring (606).

5. The broadband surface acoustic wave filter for emission according to claim 1, wherein the cover plate (6) has a plurality of stepped holes (608), the stepped holes (608) are internally provided with pin sleeves (609) connected to the metal electrodes (5), the cover plate (6) has a groove (610) on a side surface close to the substrate (2), the groove (610) is internally provided with a connecting post (611) connected to the pin sleeves (609), the two ends of the connecting post (611) are both provided with the anti-pulling strip (612), the inner wall of the mounting groove (201) is provided with a plurality of positioning tables (613) at positions corresponding to the anti-pulling strip (612), and the surface of the anti-pulling strip (612) is provided with a hooking table (614) for hooking the positioning tables (613).

6. The wideband surface acoustic wave filter for transmission as claimed in claim 5, wherein both ends of said tear-proof strip (612) are each provided with a guide block (615) on a surface of a side away from said hooking base (614), and a plurality of step strips (616) are provided on a side wall of said guide block (615).

7. The wideband surface acoustic wave filter for transmission as claimed in claim 6, wherein the length values of a plurality of said ladder bars (616) are set in a linearly increasing trend from a side near the tear-off preventing bar (612) to a side far from the tear-off preventing bar (612).

8. A wideband surface acoustic wave filter for transmission as claimed in claim 5, characterized in that said tear bar (612) is combined with two of said guide blocks (615) to form a font structure.

9. A wideband surface acoustic wave filter for transmission as claimed in claim 5, characterized in that the length value of said tear preventing strips (612) is greater than the length value of the metal electrodes (5).

Technical Field

The embodiment of the invention relates to the field of filters, in particular to a broadband surface acoustic wave filter for emission.

Background

The surface acoustic wave filter is formed by evaporating a metal film on a material substrate with piezoelectric effect, and then photoetching to form a pair of interdigital electrodes at two ends respectively. When signal voltage is applied to the transmitting transducer, an electric field is formed between the input interdigital electrodes, so that the piezoelectric material generates mechanical vibration (namely ultrasonic waves) and transmits the mechanical vibration to the left side and the right side in the form of ultrasonic waves, and the energy towards the edge side is absorbed by the sound absorption material. At the receiving end, the mechanical vibration is converted into an electric signal by the receiving transducer and then is output by the interdigital electrode.

In the existing common filter in the market, due to the requirements of the surface acoustic wave filter product performance and design function, the sealing property of a cavity at a filter chip needs to be ensured, namely, a chip functional region can not contact any substance.

Disclosure of Invention

Therefore, the embodiment of the invention provides a broadband surface acoustic wave filter for emission, which is used for solving the problem that once the surface of a cover plate or a substrate is uneven or the cover plate or the substrate is not tightly attached, a colloid material is easy to overflow into a cavity from an attachment gap of the cover plate and the substrate if plastic sealant is filled in the prior art, so that the normal use of equipment is affected.

In order to achieve the above object, an embodiment of the present invention provides the following:

a broadband surface acoustic wave filter for emission comprises an enclosure, wherein a substrate is arranged in the enclosure, plastic package glue connected with the inner wall of the enclosure is covered and installed on the outer side of the substrate, an installation groove is formed in the surface, away from the plastic package glue, of one side of the substrate, a chip is installed on the inner wall of the installation groove, an inclined groove with a cross section in a splayed structure is formed in the side, away from the plastic package glue, of the installation groove, a metal electrode is installed on the surface of the chip, a cover plate connected with the inner wall of the inclined groove is arranged on the side, away from the chip, of the metal electrode, and a sheathing assembly is arranged between the;

the cover seals the subassembly including installing the laminating ring piece at the chute inner wall, the screens groove has been seted up to the lateral wall of base plate the surface mounting of laminating ring piece just seals the chute, the surface of apron corresponds position department with just sealing the chute and has seted up the chute, the plug bush hole has been seted up to the inner wall in screens groove, the plug bush chute has been seted up to the surface of apron and plug bush hole correspondence position department the plug bush downthehole tight cover that is connected with the tip and extends to the plug bush chute, tight strip that pastes is installed to the inside wall in plug bush chute, the lateral wall of tight cover cup joints and hugs closely the gum cover of hugging closely that the strip is connected.

As a preferable scheme of the invention, the tight sticking strip consists of a sticking block connected to the inner side wall of the inserting sleeve embedding groove and a plurality of pressing blocks arranged on the surface of the sticking block, and the surface of the primary sealing inclined sleeve is provided with an arc-shaped anti-falling groove.

As a preferable scheme of the invention, the cross section of the compact sleeve is in a square structure, a pulling block connected with the inner wall of the clamping groove is arranged in the compact sleeve, the pulling block comprises a pressing and pulling sheet arranged on the inner wall of the compact sleeve, one end of the pressing and pulling sheet far away from the compact sleeve is provided with a fixing sheet with an L-shaped cross section, and the width of the fixing sheet is larger than that of the pressing and pulling sheet.

As a preferable scheme of the invention, the cover plate comprises a main cover plate connected with the chute, an auxiliary cover plate is arranged on the surface of one side of the main cover plate, which is far away from the base plate, a sealing cover plate is arranged on one side of the auxiliary cover plate, which is far away from the main cover plate, a compression ring is sleeved on the side wall of the auxiliary cover plate, and a pressing piece connected with the fixing piece is arranged on the inner side wall of the compression ring.

As a preferred scheme of the invention, a plurality of stepped holes are formed in the cover plate, pin sleeves connected with the metal electrodes are installed in the stepped holes, a groove is formed in the surface of one side, close to the substrate, of the cover plate, a connecting column connected with the pin sleeves is installed in the groove, anti-pulling strips are installed at two ends of the connecting column, a plurality of positioning tables are installed at positions, corresponding to the anti-pulling strips, of the inner wall of the installation groove, and hook tables used for hooking the positioning tables are installed on the surface of the anti-pulling strips.

As a preferable scheme of the invention, the two ends of the anti-pulling strip are provided with the guide blocks on the surface of one side far away from the hook platform, and the side wall of each guide block is provided with a plurality of step strips.

As a preferable scheme of the invention, the length values of a plurality of the step strips are arranged in a linearly increasing trend from the side close to the tear-resistant strip to the side far away from the tear-resistant strip.

As a preferable aspect of the present invention, the tear strip is combined with the two guide blocks to form a letter-shaped structure.

In a preferred embodiment of the present invention, the length of the tear-preventing strip is greater than the length of the metal electrode.

The embodiment of the invention has the following advantages:

according to the invention, the attached cover plate and the attached base plate can be sealed and fixed for the first time through the primary sealing inclined sleeve, even if a gap exists at the joint of the cover plate and the base plate, the filled plastic package glue cannot easily penetrate into a metal electrode area, and after the cover plate and the base plate are attached, the tight sleeve can be inserted into the inserting sleeve hole, so that a gap does not exist between the cover plate and the base plate, and the sealing performance of the cover plate and the base plate is improved;

the invention can position the cover plate and the substrate through the anti-pulling strip, and prevent the situation that the plastic package glue is not uniformly filled so as to expand the substrate on one side.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is an external view of a substrate according to an embodiment of the present invention;

FIG. 3 is an enlarged view of FIG. 1 at A;

FIG. 4 is a side cross-sectional structural view of a cover plate according to an embodiment of the present invention;

FIG. 5 is a bottom view of an embodiment of the tear strip of the present invention as installed.

In the figure:

1-enclosing a cover; 2-a substrate; 3-plastic sealing glue; 4-chip; 5-a metal electrode; 6-cover plate; 7-a sheathing assembly; 8, tightly sticking the strips; 9-pulling the block;

201-mounting grooves; 202-a chute; 203-clamping groove; 204-inserting sleeve holes;

601-embedding a groove in an inclined manner; 602-inserting and sleeving a caulking groove; 603-main cover plate; 604-secondary cover plate; 605-cover plate; 606-pressing a ring; 607-a lamination block; 608-a stepped bore; 609-pin sleeve; 610-a trench; 611-connecting column; 612-tear resistant strips; 613-positioning table; 614-hook table; 615-a boot block; 616-ladder bars;

701-attaching a ring sheet; 702-primary sealing of an inclined sleeve; 703-a tight sleeve; 704-clinging to the rubber sleeve; 705-anticreep groove;

801-sticking block; 802-compacting the block;

901-pressing the pull tab; 902-anchor sheet.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present invention provides a broadband surface acoustic wave filter for emission, which can perform primary sealing and fixing on a cover plate 6 and a substrate 2 which are attached to each other through a primary sealing inclined sleeve 702, and after the cover plate 6 and the substrate 2 are attached to each other, a tight sleeve 703 can be inserted into an insertion sleeve hole 204, so that a gap does not exist between the cover plate and the substrate, thereby improving the sealing performance of the cover plate and the substrate; meanwhile, the cover plate 6 and the substrate 2 can be positioned through the anti-pulling strip 612, and the situation that the plastic sealant 3 is unevenly filled so that the substrate 2 on one side is expanded is prevented.

This wave filter is including enclosing cover 1 be provided with base plate 2 in enclosing cover 1, base plate 2's outside cover install with enclose cover 1 inner wall connection's plastic envelope glue 3, just base plate 2 keeps away from a side surface of plastic envelope glue 3 and has seted up mounting groove 201, chip 4 is installed to mounting groove 201's inner wall, just mounting groove 201 is offering the transversal chute 202 of personally submitting the splayed structure in one side of keeping away from plastic envelope glue 3, the surface mounting of chip 4 has metal electrode 5, and this metal electrode 5 is the same to constitute by extraction electrode and transducer electrode with common wave filter electrode on the market, metal electrode 5 is equipped with the apron 6 with chute 202 inner wall connection in one side of keeping away from chip 4 be equipped with cover seal subassembly 7 between apron 6 and base plate 2.

When the device is assembled, the chip 4 and the metal electrode 5 can be directly installed in the installation groove 201 on the substrate 2, then the cover plate 6 is attached to the substrate 2, the plastic sealant 3 is filled, and the plastic sealant 3 can be fixedly sealed and isolated from gaps through the sheathing component 7 in the filling process.

As shown in fig. 1 and 3, the sleeve sealing assembly 7 includes a bonding ring plate 701 installed on the inner wall of the chute 202, a clamping groove 203 has been opened on the outer side wall of the substrate 2, the surface of the bonding ring plate 701 is provided with a primary sealing inclined sleeve 702, an inclined sleeve caulking groove 601 has been opened on the surface of the cover plate 6 corresponding to the primary sealing inclined sleeve 702, a sleeve inserting hole 204 has been opened on the inner wall of the clamping groove 203, a sleeve inserting caulking groove 602 has been opened on the surface of the cover plate 6 corresponding to the sleeve inserting hole 204, a tight sleeve 703 having an end extending into the sleeve inserting caulking groove 602 is connected in the sleeve inserting hole 204, a tight strip 8 is installed on the inner side wall of the sleeve inserting groove 602, and a tight rubber sleeve 704 connected with the tight strip 703 is sleeved on the side wall of the tight sleeve 703.

When the cover plate 6 is attached to the substrate 2, the primary sealing taper sleeve 702 can be directly inserted into the taper sleeve caulking groove 601 until the attachment ring 701 is attached to the surface of the cover plate 6 (because the surface of the primary sealing taper sleeve 702 is provided with the arc-shaped anti-drop groove 705, the primary sealing taper sleeve 702 inserted into the taper sleeve caulking groove 601 cannot move easily, so that the substrate 2 cannot be easily expanded when the molding compound 3 is filled), and thus the primary sealing function is achieved, so that the molding compound 3 cannot easily penetrate into the cavity area of the metal electrode 5 when being filled, and then the tight sleeve 703 is inserted into the plug sleeve hole 204 until the end of the tight sleeve 703 is attached to the inner wall of the plug sleeve caulking groove 602, and in the process of inserting the tight sleeve, the tight sleeve 704 can gradually press the compression strip 8, so that the gap between the cover plate 6 and the substrate 2 cannot easily occur.

The tight attaching strip 8 is composed of an attaching block 801 connected to the inner side wall of the inserting sleeve embedding groove 602 and a plurality of tight pressing blocks 802 installed on the surface of the attaching block 801.

When the tight fit rubber sleeve 704 contacts the pressing block 802, the tight fit rubber sleeve 704 is compressed, so that the tight fit sleeve 703 can be gradually inserted, but the substrate 2 at this time is driven to tightly press the cover plate 6, so that the cover plate 6 and the substrate 2 are more tightly fitted (even if there is a gap, the position between the cover plate 6 and the substrate 2 can be corrected and the gap can be sealed under the fitting operation) (two or four tight fit sleeves 703 are symmetrically arranged).

As shown in fig. 2, the cross section of the tight sleeve 703 is in a square structure, a pulling block 9 connected with the inner wall of the clamping groove 203 is installed in the tight sleeve 703, the pulling block 9 includes a pressing and pulling sheet 901 installed on the inner wall of the tight sleeve 703, one end of the pressing and pulling sheet 901 far away from the tight sleeve 703 is installed with a fixing sheet 902 having an L-shaped cross section, and the width of the fixing sheet 902 is greater than that of the pressing and pulling sheet 901.

When the tight sleeve 703 is fixed, the pulling block 9 can be inserted into the tight sleeve 703, and then the molding compound 3 is refilled, after the molding compound 3 is solidified, the pressing and pulling piece 901 can be pulled by the fixing piece 902 to press the tight sleeve 703, so that the position of the tight sleeve 703 cannot generate vibration or movement, and the size of the fixing piece 902 is set in such a way to play a role in isolating the gap between the tight sleeve 703 and the sleeve inserting hole 204, so that the molding compound 3 cannot easily generate overflow.

As shown in fig. 1 and 4, the cover plate 6 includes a main cover plate 603 connected to the chute 202, a sub-cover plate 604 is installed on a surface of one side of the main cover plate 603 away from the substrate 2, a sealing cover plate 605 is installed on one side of the sub-cover plate 604 away from the main cover plate 603, a pressing ring 606 is sleeved on a side wall of the sub-cover plate 604, and a pressing block 607 connected to the fixing plate 902 is installed on an inner side wall of the pressing ring 606.

The cover plate 6 is to be able to sufficiently fix with the substrate 2, and in the specific implementation, the main cover plate 603 is directly inserted into the chute 202 (the shape of the chute 202 is set so as to make a comparison with a lying surface, so that the sealant material cannot easily flow), and the sub-cover plate 604 and the cover plate 605 are to perform a step bearing function, and in the manufacturing of a finished product, a metal material used by a common filter in the existing market can be selected and formed by turning and milling through a lathe, and after the cover plate 6 is sufficiently attached to the substrate 2, the press ring 606 can be fixed on the sub-cover plate 604 (for example, fixed in a spot welding manner), so that the fixing piece 902 is pressed by the pressing piece 607, thereby facilitating the subsequent sealant filling operation.

As shown in fig. 4 and 5, a plurality of stepped holes 608 are formed in the cover plate 6, a pin sleeve 609 connected with the metal electrode 5 is installed in the stepped hole 608, a groove 610 is formed in a surface of one side of the cover plate 6 close to the substrate 2, a connection column 611 connected with the pin sleeve 609 is installed in the groove 610, anti-pulling strips 612 are installed at two ends of the connection column 611, a plurality of positioning tables 613 are installed at positions corresponding to the anti-pulling strips 612 on an inner wall of the installation groove 201, and a hooking table 614 for hooking the positioning tables 613 is installed on a surface of the anti-pulling strips 612.

At least two lead frames 609 should be provided, and then the lead frames 609 are filled with metal (the manner here is not exclusive, and is specifically adjusted according to requirements) to obtain two leads, i.e., input and output leads.

When the cover plate 6 is attached to the substrate 2, the anti-pulling strip 612 can be directly inserted into the mounting groove 201 on the substrate 2 to achieve the effect of further sealing and fixing, in the specific implementation, the anti-pulling strip 612 can slide along the inner wall of the mounting groove 201, and then the hooking table 614 can gradually hook the positioning table 613, if a gap occurs when the cover plate 6 is attached to the substrate 2, (that is, the number of the positioning tables 613 hooked by the two anti-pulling strips 612 is different), when the tight sleeve 703 is subsequently inserted, the positions of the cover plate 6 and the substrate 2 can be corrected, so that the number of the positioning tables 613 hooked by the two anti-pulling strips 612 is the same, and the effect of resealing is achieved, and even if a part of the area is filled, the substrate 2 can not be easily expanded.

The two ends of the anti-pulling strip 612 are provided with guide blocks 615 on the surface of one side far away from the hook table 614, and the side wall of each guide block 615 is provided with a plurality of step strips 616.

The arrangement is to further increase the sealing performance and the anti-seepage performance between the cover plate 6 and the substrate 2, and when plastic package material seeps in, the plastic package material can not easily contact the electrode region by the guiding and current limiting effect of the plurality of step bars 616.

The length of the plurality of step strips 616 increases linearly from the side near the tear resistant strip 612 to the side away from the tear resistant strip 612.

This is so arranged that the penetrating molding compound will eventually only accumulate at the four corners of the substrate 2 and will not contact the motor cavity area.

The anti-tear strip 612 and the two guide blocks 615 are combined to form a font structure, and the length value of the anti-tear strip 612 is greater than that of the metal electrode 5.

This is provided to completely cover the metal electrode 5 to function as a secondary barrier.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.