Crystal oscillator and production device thereof

Abstract

The invention discloses a crystal oscillator and a production device thereof. The crystal oscillator comprises a shell, a base and a crystal wafer. The base is provided with mounting feet for mounting a crystal wafer; a welding part which is bonded with the crystal wafer through a lead is arranged on the mounting pin; the welding part is made of tin-silver alloy, and the tin-silver alloy is composed of 95.5%-96.5% of tin, 2.5%-3.5% of silver and 0.4%-0.7% of copper; the outer surface of the welding part is coated with a soldering flux; a pin in contact with the welding part is arranged on the base in a penetrating manner; after the pin is heated, one end of the pin, which is in contact with the welding part, can enable the welding part to be hot-melted to be connected with the lead, and the melted alloy material flows into the matching part of the pin and the base to finish sealing; the invention provides a crystal oscillator and a production device thereof. The sealing groove is formed in the base of the crystal oscillator to improve the sealing performance of the crystal oscillator, vacuum suction is carried out through the through holes of the pins, and the vacuum degree in the crystal oscillator is improved.

Description

Technical Field

[0001] The invention relates to the technical field of crystal oscillators and production equipment thereof, in particular to a crystal oscillator and a production device thereof. Background Art

[0002] Crystal oscillator, full name crystal oscillator, is an electronic component that uses the piezoelectric effect of quartz crystal to generate a stable frequency signal. Quartz crystal oscillators are widely used in electronic circuits, especially in situations where a high-precision and high-stability frequency source is required.

[0003] In a crystal oscillator (Crystal Oscillator), the fixing method of the quartz crystal usually needs to ensure that the crystal can vibrate freely and is not affected by external mechanical stress. In order to protect the quartz crystal from the influence of the external environment, such as humidity, dust, etc., the crystal oscillator is usually sealed in an airtight housing. This housing can usually be a metal can with a vacuum inside.

[0004] The existing quartz crystal of the crystal oscillator has poor internal sealing. Usually, the shell and the base are directly bonded by gluing, and a vacuum is formed inside through a vacuum device. This method is relatively complicated and it is very easy to leave some air inside during the manufacturing process, thus affecting the accuracy of the crystal oscillator. In addition, the leads of existing crystal oscillators are usually connected to the base before the shell is packaged, which causes the pins to tilt and deform during the subsequent packaging process or operation. The two sides of the leads will be of different lengths due to the welding process or tooling accuracy not meeting the standards, affecting the quality of the finished crystal oscillator. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a crystal oscillator and a production device thereof, through which the pins can be heated to combine with the base, and vacuum suction and sealant injection are performed in the shell to improve the sealing quality of the crystal oscillator.

[0006] To solve the above technical problems, the present invention solves the problems through the following technical solutions: a crystal oscillator comprises a housing, a base and a crystal sheet.

[0007] In the above solution, preferably, the base is provided with mounting feet for mounting the crystal piece; The mounting foot is provided with a welding portion which is wire-bonded to the crystal sheet; The welding part is a tin-silver alloy composed of 95.5-96.5% tin, 2.5-3.5% silver and 0.4-0.7% copper; The surface of the welding part is coated with flux; The base is provided with a pin in contact with the welding portion; After the pin is heated, one end of the pin in contact with the welding part can cause the welding part to be hot-melted and connected to the lead, and the melted alloy material flows into the matching position of the pin and the base to complete the sealing.

[0008] In the above solution, preferably, the base includes a boss matched with the shell, and the boss is provided with a sealing groove matched with the shell.

[0009] In the above solution, preferably, the base is provided with an injection hole connected to the sealing groove and capable of injecting sealant therein.

[0010] In the above solution, preferably, a pin hole is provided on the base, an annular groove is provided in the pin hole, and the annular groove is connected to the sealing groove through a connecting hole.

[0011] A crystal oscillator production device comprises a clamping member for clamping a base and a conveying unit for conveying pins; The conveying unit includes a guide seat for guiding the pins and a conveyor for conveying the pins; The guide seat is provided with a heating element for heating the pins; The clamping member is provided with an injection tube matched with the injection hole, and the injection tube is connected to an injection pump to inject sealant into the injection hole.

[0012] In the above scheme, preferably, the guide seat is provided with a guide hole matching with the pin, the guide seat is provided with a first suction hole connected with the guide hole, and the first suction hole is connected with a vacuum pump.

[0013] In the above solution, preferably, one end of the guide seat is against the base, and the other end is provided with a cutting unit; The cutting unit comprises a cutter and a cutter seat, a compression chamber for the cutter seat to move is provided in the guide seat, and a first spring is provided between the cutter seat and the compression chamber; The compression chamber is connected to the vacuum pump through the second suction hole.

[0014] In the above scheme, preferably, a cooling groove is provided on the guide seat, and the cooling groove is connected to a cooling pump.

[0015] In the above solution, preferably, a second spring is provided between the injection tube and the clamping member.

[0016] In the above solution, preferably, a sealing ring cooperating with the pin is provided on the guide seat.

[0017] The beneficial effects of the present invention are: The present invention provides a crystal oscillator and a production device thereof; a sealing groove is arranged on the base of the crystal oscillator to improve the sealing performance of the crystal oscillator, and vacuum suction is performed through the perforation of the pins to improve the vacuum degree in the crystal oscillator; In addition, by heating the pin and hot-melting the welding part on the mounting foot, the integrity of the connection between the pin and the mounting foot is improved. At the same time, after the pin is welded, the hot-melted welding part can seal the perforation of the pin on the base, improve the sealing of the base, and guide the pin to cut, thereby improving the overall straightness of the pin of the finished crystal oscillator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the crystal oscillator explosion structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the crystal oscillator base of the present invention.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the crystal oscillator base of the present invention.

[0021] Figure 4 It is the front view of the production device of the crystal oscillator of the present invention.

[0022] Figure 5 For the present invention Figure 4 Schematic diagram of the local enlarged structure at point A in the middle. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Example 1: See Figure 1-Figure 5 .

[0024] A crystal oscillator comprises a housing 1, a base 2 and a crystal plate 3. The base 2 is symmetrically provided with mounting feet 4 on both sides. The mounting feet 4 are fixed to the base 2 as a whole. The crystal plate 3 is fixed to the upper end of the mounting feet 4.

[0025] The base 2 includes a boss 201, and the mounting foot 4 is fixed on the upper end surface of the boss 201. The mounting foot 4 is close to one end of the boss 201 and is away from the neutral plane of the base 2. A welding portion 401 protruding outward is provided, and the electrode on the crystal piece 3 is connected to the welding portion 401 by wire bonding.

[0026] The welding portion 401 includes a support leg fixedly connected to the mounting leg 4, and the support leg is bonded to the electrode lead of the crystal piece 3. After bonding, the outside of the support leg is coated with a welding material, and the material is made of a tin-silver alloy. Specifically, the composition ratio of the tin-silver alloy is: 95.5-96.5% tin, 2.5-3.5% silver and 0.4-0.7% copper.

[0027] The outer surface of the welding part 401 is coated with flux, and the material of the flux can be rosin, etc. The base 2 is provided with a pin hole 204, in which a pin 5 can be inserted; Figure 1As shown, the pin 5 passes through the pin hole 204 from bottom to top and then abuts against the lower end surface of the welding part 401. After being heated to a high temperature, the pin 5 contacts one end of the welding part 401 to melt the welding part 401 into a fluid state. Subsequently, the welding material of the welding part 401 flows to the end of the pin 5, a part of which welds the pin 5 to the leg of the welding part 401, and the other part flows along the outer wall of the pin 5 to the contact position between the pin 5 and the pin hole 204 to seal the pin hole 204. The flux on the surface of the welding part 401 can enhance the deoxidation function of the pin surface. At the same time, the silver-based solder can enhance the fluidity of the soldering material after melting.

[0028] The boss 201 is provided with a sealing groove 202 that matches the shell 1, and the lower end surface of the base 2 is symmetrically provided with injection holes 203 that are connected to the sealing groove 202 and can inject sealant therein. The pin hole 204 is provided with an annular groove 205, and the annular groove 205 is connected with the sealing groove 202 through a connecting hole 206; after the shell 1 is sleeved on the boss 201, the inner wall of the shell 1 fits with the sealing groove 202, and then the sealant can be filled into the sealing groove 202 and the annular groove 205 through the injection hole 203, so that sealing is achieved between the shell 1 and the base 2 and between the pin 5 and the pin hole 204.

[0029] A production device for a crystal oscillator, specifically, after assembling a shell 1 and a base 2 in the crystal oscillator, inserting a pin 5 into the shell 1 through a pin hole 204, then hot-melt welding the pin 5 to a welding portion 401 and injecting glue into a sealing groove 202.

[0030] The production device includes a clamping member 6 for clamping the base 2 and a conveying unit 7 for conveying the pin 5. The conveying unit 7 includes a guide seat 701 for guiding the pin 5 and a conveyor 702 for conveying the pin 5. The conveyor 702 includes symmetrically arranged guide wheels, wherein a driving motor is arranged on any guide wheel. The pin 5 is conveyed and straightened after passing through the gap between the guide wheels, and then the end of the pin 5 enters the guide seat 701.

[0031] When in use, the crystal piece 3 is first pre-installed on the mounting foot 4 of the base 2, and the electrode of the crystal piece 3 is bonded to the support foot on the mounting foot 4 by wire bonding, and then the welding part 401 is covered outside the support foot, and the outer surface is coated with flux; the outer shell 1 is put on the boss 201 to complete the pre-installation.

[0032] The clamping member 6 is a pneumatic clamping head, which clamps both ends of the base 2 and then moves to the upper end of the guide seat 701, so that the lower end surface of the base 2 is pressed against the upper end surface of the guide seat 701. Figure 4As shown; the guide seat 701 is provided with a guide hole 705 for guiding the pin 5. After the base 2 is clamped and displaced by the clamping member 6, the pin hole 204 and the guide hole 705 are in a concentric state; after the pin 5 is transported by the transport unit, its upper end passes through the guide hole 705 and enters into the pin hole 204 in the base 2, and then its upper end abuts against the lower end surface of the welding portion 401.

[0033] A heating element 703 matching with the guide hole 705 is provided on the side wall of the guide seat 701 close to one end of the base 2. Specifically, the heating element 703 can be pressed against the wall of the pin 5 in the guide hole 705. After the heating element 703 contacts the pin 5, the pin 5 can be heated. The heating temperature is preferably 3-500°C. After the pin 5 is heated, the end thereof placed in the housing 1 conducts the high temperature to the welding portion 401, so that the welding portion 401 is hot-melted, completing the welding connection between the pin 5 and the welding portion 401 bracket. At the same time, part of the hot melt flows into the pin hole 204 to fill the gap between the pin 5 and the pin hole 204.

[0034] The guide seat 701 is provided with a first suction hole 706 connected to the guide hole 705. The first suction hole 706 is connected to a vacuum pump. When the pin 5 is heated, the inner cavity of the shell 1 is sucked through the gap between the guide hole 705 and the pin 5 through the first suction hole 706 to achieve vacuum inside.

[0035] One end of the guide seat 701 is against the base 2, and the other end is provided with a cutting unit 8, and the cutting unit 8 is used to cut the pin 5; specifically, the cutting unit 8 includes a cutter 801 and a knife seat 802, and a compression chamber 803 for the knife seat 802 to move is provided in the guide seat 701. Figure 5 As shown, the knife seat 802 is slidably arranged in the compression chamber 803, and a first spring 804 is arranged between the knife seat 802 and the compression chamber 803; in the initial state, the gap between the tip of the cutter 801 and the outer wall of the pin 5 is preferably 0.1-0.5mm, at this time, the first spring 804 is in a free extension state, that is, the pin 5 does not contact the cutter 801 during transmission.

[0036] The compression chamber 803 is connected to the vacuum pump through the second suction hole 805. When the vacuum pump is working, the inside of the crystal oscillator is sucked through the first suction hole 706. At the same time, a negative pressure is formed in the compression chamber 803 through the second suction hole 805. At this time, the knife seat 802 compresses the first spring 804 to make the cutter 801 move away from the pin 5 to accumulate force. After the vacuum pump stops working, the suction force of the second suction hole 805 disappears. At this time, the tip of the cutter 801 impacts the pin 5 under the elastic force of the first spring 804, and the pin 5 is cut off.

[0037] The clamping member 6 is provided with an injection tube 704 that matches the injection hole 203. The injection tube 704 is connected to an injection pump to inject sealant into the injection hole 203. A second spring 709 is provided between the injection tube 704 and the clamping member 6. When the clamping member 6 clamps the base 2, the injection tube 704 and the injection hole 203 are pressed against each other, and the end of the injection tube 704 is tightly combined with the injection hole 203 through the second spring 709. After the injection tube 704 injects the sealant through the injection hole 203, the sealant fills the sealing groove 202 and the annular groove 205, so that the crystal oscillator is sealed as a whole.

[0038] The guide seat 701 is provided with a cooling groove 707, and the cooling groove 707 is arranged below the cutter 801. The cooling groove 707 is connected to a cooling pump 708. The coolant passes through the cooling groove 707 to cool the pin 5 below the cutter 801, thereby not affecting the subsequent transmission of the pin; at the same time, a sealing ring 710 matching the pin 5 is provided at the lower end of the guide seat 701, and the sealing ring 710 is arranged in the guide hole 705, thereby improving the sealing between the guide seat 701 and the pin 5.

[0039] In addition, a sealing gasket is provided at one end of the guide seat 701 close to the base 2 to further enhance the overall sealing performance of the entire guide seat 701 .

[0040] In this embodiment, the pump element and the electrical components in the conveying unit can be automatically controlled by a PLC controller.

[0041] A production method using a production device of a crystal oscillator as described above: S1: The clamping member 6 clamps the pre-installed crystal oscillator to the upper end surface of the guide seat 701, so that the lower end surface of the base 2 fits with the upper end surface of the guide seat 701, and the injection tube 704 on the clamping member 6 cooperates with the injection hole 203; S2: The conveyor 702 is started to input the pin 5 into the base 2 through the guide hole 705. After the upper end of the pin 5 contacts the lower end surface of the welding part 401, the conveyor 702 stops. S3: Then the heating element 703 heats the pin 5. After the pin 5 is heated, its upper end melts the welding part 401. After the welding part 401 melts, the pin 5 is welded to the bracket in the welding part 401, and the gap between the pin 5 and the pin hole 204 is blocked at the same time. S4: while S3 is in operation, the cooling pump 708 is in operation to cool the pins near the lower end of the guide seat 701 to prevent heat from being transferred to the subsequent pins. At the same time, the vacuum pump is started to suck the air in the housing 1 through the first suction hole 706 and the compression chamber 803 through the second suction hole 805 to store power in the cutter 801. S5: After the pin 5 is welded to the welding part in the crystal oscillator, the heating element 703 stops heating, and then the injection tube 704 injects the sealant into the injection hole 203. The sealant fills the sealing groove 202 and the annular groove 205 while vacuuming, thereby sealing the entire crystal oscillator; S6: Then the vacuum pump stops working, and the cutter 801 cuts off the pins 5 on both sides synchronously under the elastic force of the first spring 804, and the clamping member 6 pulls the cut pins out of the guide seat 701, completing the production of the crystal oscillator. Example 2

[0042] Compared with Example 1, this embodiment is different in the ratio of welding materials in the welding portion 401, and the rest is the same.

[0043] Specifically, the tin-silver alloy of the welding portion 401 has a composition ratio of 96% tin, 3.5% silver and 0.5% copper, and the thickness of the flux coated on its surface is 0.03-0.07mm, which can be adaptively adjusted according to the size of the crystal oscillator.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crystal oscillator, comprising a housing (1), a base (2) and a crystal plate (3), characterized in that: The base (2) is provided with mounting feet (4) for mounting the crystal sheet (3); The mounting foot (4) is provided with a welding portion (401) which is bonded to the crystal sheet (3) via a wire bond; The welding part (401) is a tin-silver alloy composed of 95.5-96.5% tin, 2.5-3.5% silver and 0.4-0.7% copper; The surface of the welding portion (401) is coated with flux; The base (2) is provided with a pin (5) which contacts the welding portion (401); After the pin (5) is heated, one end of the pin (5) in contact with the welding portion (401) can cause the welding portion (401) to be hot-melted and connected to the lead wire, and the melted alloy material flows into the matching position of the pin (5) and the base (2) to complete the sealing.

2. A crystal oscillator according to claim 1, characterized in that: The base (2) comprises a boss (201) that matches the outer shell (1), and a sealing groove (202) that matches the outer shell (1) is provided on the boss (201).

3. A crystal oscillator according to claim 2, characterized in that: The base (2) is provided with an injection hole (203) which is connected to the sealing groove (202) and can be used to inject sealant therein.

4. A crystal oscillator according to claim 3, characterized in that: The base (2) is provided with a pin hole (204), an annular groove (205) is provided in the pin hole (204), and the annular groove (205) is connected to the sealing groove (202) via a connecting hole (206).

5. A production device for processing a crystal oscillator as claimed in any one of claims 1 to 4, characterized in that: It comprises a clamping member (6) for clamping a base (2) and a conveying unit (7) for conveying a pin (5); The conveying unit comprises a guide seat (701) for guiding the pin (5) and a conveyor (702) for conveying the pin (5); The guide seat (701) is provided with a heating element (703) for heating the pin (5); The clamping member (6) is provided with an injection tube (704) that matches the injection hole (203), and the injection tube (704) is connected to an injection pump to inject sealant into the injection hole (203).

6. The crystal oscillator production device according to claim 5, characterized in that: The guide seat (701) is provided with a guide hole (705) matching with the pin (5), and the guide seat (701) is provided with a first suction hole (706) connected to the guide hole (705), and the first suction hole (706) is connected to a vacuum pump.

7. The crystal oscillator production device according to claim 5, characterized in that: One end of the guide seat (701) is in contact with the base (2), and the other end is provided with a cutting unit (8); The cutting unit (8) comprises a cutting knife (801) and a knife seat (802); a compression chamber (803) for the knife seat (802) to move is provided in the guide seat (701); a first spring (804) is provided between the knife seat (802) and the compression chamber (803); The compression chamber (803) is connected to the vacuum pump via the second suction hole (805).

8. The crystal oscillator production device according to claim 5, characterized in that: The guide seat (701) is provided with a cooling groove (707), and the cooling groove (707) is connected to a cooling pump (708).

9. The crystal oscillator production device according to claim 5, characterized in that: A second spring (709) is provided between the injection tube (704) and the clamping member (6).

10. The crystal oscillator production device according to claim 5, characterized in that: The guide seat (701) is provided with a sealing ring (710) that matches the pin (5).

Images