CN202750045U - Anti-vibration crystal oscillator component - Google Patents
Anti-vibration crystal oscillator component Download PDFInfo
- Publication number
- CN202750045U CN202750045U CN 201220385514 CN201220385514U CN202750045U CN 202750045 U CN202750045 U CN 202750045U CN 201220385514 CN201220385514 CN 201220385514 CN 201220385514 U CN201220385514 U CN 201220385514U CN 202750045 U CN202750045 U CN 202750045U
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- crystal oscillator
- complete machine
- vibration isolator
- vibration
- printed board
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Abstract
The utility model discloses an anti-vibration crystal oscillator component, which comprises an overall unit, a crystal oscillator, a plurality of first shock absorbers and a second shock absorber, wherein the overall unit is arranged on an overall unit printing board, the crystal oscillator is arranged on the center of a cavity of the overall unit, a second printing board is arranged on the output end of the crystal oscillator, the output end of the crystal oscillator is the top portion of the crystal oscillator, and pins of the crystal oscillator are arranged on the second printing board, and are connected with the overall unit printing board through connecting wires. A groove is further arranged on the second printing board, the first shock absorbers are arranged between the bottom portion of the cavity of the overall unit and the crystal oscillator, the second chock absorber is arranged on the groove, a pressing sheet is further arranged on the second shock absorber, and the pressing sheet and the overall unit are fixed. The anti-vibration crystal oscillator component is simple in mounting method and obvious in damping effect, and can guarantee the crystal oscillator to have characteristics of high stability and low phase noise in a complex work environment, thereby meeting use requirement of engineering.
Description
Technical field
The utility model relates to crystal oscillator, is specifically related to a kind of antivibration crystal oscillator assembly.
Background technology
Crystal oscillator shows the characteristic of low phase noise, high stability, high reliability in the operational environment of static state, the phase noise under the quiescent operation environment as shown in Figure 1a.And existing vibration, centrifugal and impact etc. various external force in the actual operational environment, these external force are referred to as the environment acceleration.The effect of environment acceleration directly worsens the phase noise characteristic of crystal oscillator, and deterioration degree even can reach (30～40) dB is shown in Fig. 1 b.
The design feature of crystal oscillator and pin connected mode such as Fig. 2 a, shown in the 2b (wherein, Fig. 2 a representative is connected with the stereogram of the crystal oscillator 20` of pin 22`, Fig. 2 b representative is connected with the vertical view of the crystal oscillator 20` of pin 22`), its structure is the structure of cuboid, power supply, control and mode signal output adopt the pin form, and all on the same face, this also is structure and pin form that crystal oscillator adopts usually, crystal oscillator 20` directly was welded on the upper use of complete machine printed board 11`, welding effect figure such as Fig. 3 a in the past, (wherein Fig. 3 a representative is welded with the stereogram of the crystal oscillator of circuit board shown in the 3b; Fig. 3 b representative is welded with the vertical view of the crystal oscillator of circuit board).The output of crystal oscillator directly is connected with the complete machine printed board, and fly line is longer.Adopt this mounting means, the external force that is delivered to printed board is directly transmitted the crystal oscillator internal circuit by pin, directly deteriorates into the phase noise of crystal oscillator.
Therefore, need a kind of technical scheme of design badly, can be in the operational environment of reality, under the impact of external force acceleration, crystal oscillator still can keep low phase noise, high stability and high reliability.
The utility model content
The purpose of this utility model is reduction or eliminates the environment acceleration to the impact of the phase noise of crystal oscillator, select on the one hand only vibration isolator to reduce to be delivered to the acceleration of crystal oscillator internal circuit, reduce on the other hand the acceleration sensitive coefficient of crystal oscillator itself.
For achieving the above object, the utility model also provides a kind of crystal oscillator assembly that obtains by the antivibration installation method of above-mentioned crystal oscillator, and this assembly comprises:
Complete machine is provided with the complete machine printed board on this complete machine;
Be arranged on the crystal oscillator at the cavity center of complete machine, at the output (that is, at the top of crystal oscillator) of crystal oscillator the second printed board be set, the pin of crystal oscillator is arranged in this second printed board, is connected with the complete machine printed board by connecting line; Also offer groove in this second printed board;
Between the cavity bottom of complete machine and crystal oscillator, some the first vibration isolators are set;
Be arranged on the second vibration isolator on this groove, on this second vibration isolator compressing tablet be set also, this compressing tablet and complete machine are fixed.
Above-mentioned crystal oscillator assembly wherein, is provided with some through holes in described the first vibration isolator, the second vibration isolator, to improve effectiveness in vibration suppression.
Above-mentioned crystal oscillator assembly, wherein, the pitch of holes between any two of described through hole all equates.
Above-mentioned crystal oscillator assembly, wherein, the gap between described crystal oscillator and the complete machine cavity is less than the thickness of the first vibration isolator, the second vibration isolator, so that the first vibration isolator, the second vibration isolator are in squeezed state all the time, to strengthen effectiveness in vibration suppression.
Above-mentioned crystal oscillator assembly wherein, arranges two the first vibration isolators between the cavity bottom of complete machine and crystal oscillator, these two first vibration isolators are coated on respectively on two angles of crystal oscillator bottom, at right angles shape.
Above-mentioned crystal oscillator assembly, wherein, described the second vibration isolator is square, described groove is square.
Above-mentioned crystal oscillator assembly, wherein, described connecting line should be as far as possible short, and have certain radian, to reduce the impact of connecting line disturbance.
Crystal oscillator of the present utility model is selected the SC cut type, adopts horizontal installation, and namely crystal oscillator is fixed on the complete machine by three strong points, and is little in the acceleration sensitive coefficient difference of X, Y, three directions of Z like this, is unlikely to the large especially of a direction.By inductance value, the capacitance of radio frequency simulation software ADS simulation optimization resonant tank, improve the equivalence of resonant tank.
The phase noise characteristic of crystal oscillator, the pass that is embodied on the relative variation of frequency is:, in the formula be crystal oscillator for the coefficient of sensitivity of environment acceleration, be the environment acceleration, how to reduce or the utility model in key, specific design is mainly considered from following two aspects:
(1) by the cushioning effect of suitable vibration isolator reinforcement to the environment acceleration, be the most direct effective method that reduces.
(2) how to reduce, from the definition of acceleration sensitive coefficient:,
In the formula, being the effective value of oscillation circuit, is the phase place variation that produces because of acceleration.This shows, the acceleration sensitive degree of crystal oscillator is relevant with the condition of work of oscillation circuit.So set about from two aspects, in the design of crystal oscillator, improve on the one hand the value in loop as far as possible; Reduce on the other hand the phase jitter that loop element (comprising crystal) causes because of acceleration as far as possible, the crystal of selecting SC to cut, acceleration sensitive coefficient difference in three directions is few, the adjustable elements such as inductance point glue after debugging is determined is fixed, adopt horizontal crystal oscillator, lead-in wire curves the certain radian welding.
The antivibration crystal oscillator assembly that the utility model provides, installation method is simple, has the characteristic of high stability and low phase noise under the operational environment of complexity, and effectiveness in vibration suppression is remarkable, can satisfy the needs that engineering is used.
Description of drawings
Fig. 1 a is the phase noise of crystal oscillator under the quiescent operation environment.
Fig. 1 b is that the phase noise of crystal oscillator under the C magnitude vibration condition worsens situation.
Fig. 2 a is the stereogram that is connected with the crystal oscillator of pin.
Fig. 2 b is the vertical view that is connected with the crystal oscillator of pin.
Fig. 3 a is the stereogram of the traditional crystal oscillator that is welded with circuit board.
Fig. 3 b is the vertical view of the traditional crystal oscillator that is welded with circuit board.
Fig. 4 a is the stereogram of crystal oscillator assembly of the present utility model.
Fig. 4 b is the profile of crystal oscillator assembly of the present utility model.
Fig. 5 is the cutaway view of the second vibration isolator of the present utility model.
Fig. 6 is the connection layout of crystal oscillator of the present utility model and complete machine printed board.
Fig. 7 is for adopting the crystal oscillator assembly of mounting means gained of the present utility model, and the phase noise under C magnitude vibration condition improves situation.
Embodiment
Below in conjunction with drawings and Examples embodiment of the present utility model is further described:
Shown in Fig. 4 a, 4b, novel antivibration crystal damper assembly of the present utility model comprises:
Be arranged on the crystal oscillator 20 at the cavity center of complete machine 10, at the output of crystal oscillator 20 (namely, top at crystal oscillator 20) is provided with the second printed board 21, the pin 22(of crystal oscillator comprises power pins, frequency and adjusts pin and signal output pin) all welding be arranged in this second printed board 21, be connected (see figure 6) by connecting line 23 with complete machine printed board 11; Power filter network in this second printed board 21 can the establishment crystal oscillator ripple and the clutter of power supply; Also offer groove 211 in this second printed board, this groove 211 is preferably square;
Between the cavity bottom of complete machine 10 and crystal oscillator 20 some the first vibration isolators 31 are set, are preferably 2 the first oscillators, these two the first vibration isolators 31 are coated on respectively on two angles of crystal oscillator 20 bottoms, at right angles shape;
Be arranged on the second vibration isolator 32 on this groove 211, on this second vibration isolator 32 compressing tablet 40 be set also, this compressing tablet 40 is by screw 41 and complete machine 10 fixing (seeing Fig. 4 b).Wherein, the size of the through hole of press strip 40 and distance will with complete machine 10 box bodys on the size of fixing hole identical with distance, the fixing hole on the size of screw 41 and the complete machine box body big or small identical.
Gap between the outer wall of crystal oscillator 20 and complete machine 10 cavitys is less than the thickness of the first vibration isolator 31, the second vibration isolator 32, so that the first vibration isolator 31, the second vibration isolator 32 are in squeezed state all the time, to strengthen effectiveness in vibration suppression.By test, the distance of the cavity inner wall of the outer wall of crystal oscillator 20 and complete machine 10 is optimum at (1～1.5) mm, and the shape of vibration isolator also will be determined only shape at last by verification experimental verification, and the design of vibration isolator is crucial.Through verification experimental verification, the second vibration isolator is preferably square, its length equates, greater than the outer wall of crystal oscillator 20 and the gap between complete machine 10 cavity inner walls, so that the vibration isolator around the crystal oscillator is in the state of extruding, after the vibration crystal oscillator had better effectiveness in vibration suppression.
In the preferred embodiment of the present utility model, the inside of vibration isolator (comprising the first vibration isolator and the second vibration isolator) has some through holes, and the central point spacing of each through hole (being pitch of holes) d is equal, as shown in Figure 5.
In the preferred embodiment of the present utility model, the second printed board 21 and the connecting line 23 between the complete machine printed board 11 of the output face of crystal oscillator 20 are as far as possible short, curve a little the shape of certain radian, to reduce the impact of connecting line disturbance, the vertical view of connection as shown in Figure 6.
Fig. 7 be with the same vibration condition of Fig. 1 b under, the phase noise of crystal oscillator had clear improvement than Fig. 1 b after vibration damping was processed.
In the mounting means of the present utility model, crystal oscillator 20 is connected by second printed board 21 as transition with complete machine printed board 11.That is, at first, in second printed board 21 of output face increase of crystal oscillator 20, like this, the output of crystal oscillator 20 is just very flexible with being connected of complete machine printed board 11.Secondly, it is short that the connecting line of crystal oscillator 20 and complete machine printed board 11 must be tried one's best, to reduce the impact of fly line disturbance.At last, the second printed board that crystal oscillator 20 increases above will be left a foursquare groove 211 in the center, with convenient second vibration isolator 32 of placing, the stressed of the press strip 40 of crystal oscillator can directly not pass in the second printed board 21, and crystal oscillator does not have rigid direct the contact with complete machine structure.
In the mounting means of the present utility model, between complete machine 10 structures and crystal oscillator 20, place some vibration isolators and (be preferably 3, two the first vibration isolators and one second vibration isolator), there be not rigid direct the contact between crystal oscillator 20 and complete machine 10 cavitys, but by this soft contact of vibration isolator, so that being delivered to crystal oscillator 20 from complete machine 10, the environment acceleration by vibration isolator certain buffering is arranged, after the environment acceleration buffering, the acceleration that is delivered to crystal oscillator inside has reducing to a certain degree, crystal oscillator also weakens the coefficient of sensitivity of environment acceleration simultaneously, thereby reaches the purpose that reduces phase noise.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be apparent.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (7)
1. an antivibration crystal oscillator assembly is characterized in that, this assembly comprises:
Complete machine (10) is provided with complete machine printed board (11) on this complete machine (10);
Be arranged on the crystal oscillator (20) at the cavity center of complete machine (10), output at crystal oscillator (20) arranges the second printed board (21), the pin (22) of crystal oscillator (20) is arranged in this second printed board (21), is connected with complete machine printed board (11) by connecting line (23); Also offer groove (211) in this second printed board (21);
Between the cavity bottom of complete machine (10) and crystal oscillator (20), some the first vibration isolators (31) are set;
Be arranged on the second vibration isolator (32) on this groove (211), on this second vibration isolator (32) compressing tablet (40) be set also, this compressing tablet (40) is fixing with complete machine (10).
2. crystal oscillator assembly as claimed in claim 1 is characterized in that, is provided with some through holes (33) in described the first vibration isolator (31), the second vibration isolator (32).
3. crystal oscillator assembly as claimed in claim 2 is characterized in that, the pitch of holes between any two of described through hole (33) all equates.
4. such as the described crystal oscillator assembly of claim 1-3 any one, it is characterized in that, gap between described crystal oscillator (20) and complete machine (10) cavity is less than the thickness of the first vibration isolator (31), the second vibration isolator (32), so that the first vibration isolator (31), the second vibration isolator (32) are in squeezed state all the time.
5. crystal oscillator assembly as claimed in claim 1, it is characterized in that, between the cavity bottom of complete machine (10) and crystal oscillator (20), two the first vibration isolators (31) are set, these two first vibration isolators (31) are coated on respectively on two angles of crystal oscillator (20) bottom, at right angles shape.
6. crystal oscillator assembly as claimed in claim 1 is characterized in that, described the second vibration isolator (32) is square, and described groove (211) is square.
7. crystal oscillator assembly as claimed in claim 1 is characterized in that, described connecting line (23) has radian, to reduce the impact of connecting line disturbance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220385514 CN202750045U (en) | 2012-08-06 | 2012-08-06 | Anti-vibration crystal oscillator component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220385514 CN202750045U (en) | 2012-08-06 | 2012-08-06 | Anti-vibration crystal oscillator component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202750045U true CN202750045U (en) | 2013-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220385514 Expired - Lifetime CN202750045U (en) | 2012-08-06 | 2012-08-06 | Anti-vibration crystal oscillator component |
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| CN (1) | CN202750045U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751948A (en) * | 2012-08-06 | 2012-10-24 | 上海无线电设备研究所 | Anti-vibration installation method for crystal oscillator and crystal oscillator component |
| CN103338020A (en) * | 2013-06-04 | 2013-10-02 | 上海无线电设备研究所 | A crystal oscillator damping device |
| CN109687836A (en) * | 2018-11-21 | 2019-04-26 | 中国电子科技集团公司第三十八研究所 | A kind of miniaturization antivibration a reference source |
-
2012
- 2012-08-06 CN CN 201220385514 patent/CN202750045U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751948A (en) * | 2012-08-06 | 2012-10-24 | 上海无线电设备研究所 | Anti-vibration installation method for crystal oscillator and crystal oscillator component |
| CN103338020A (en) * | 2013-06-04 | 2013-10-02 | 上海无线电设备研究所 | A crystal oscillator damping device |
| CN109687836A (en) * | 2018-11-21 | 2019-04-26 | 中国电子科技集团公司第三十八研究所 | A kind of miniaturization antivibration a reference source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130220 |
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| CX01 | Expiry of patent term |