US2002167A - Quartz crystal oscillator - Google Patents

Description

May 21, 1935. a R, BECHMANN 2,002,167

QUARTZ CRYSTAL OSCILLATOR Filed July 8, 1955 12:9 10' E159. ib

INVENTOR RUDOLF BECH ANN BY .M-M/Q AT'I'ORNEY Patented May 21, 1935 UNITED STATES QUARTZ CRYSTAL OSCILLATOR Rudolf Bechmann, Berlin, Germany, assignor to Telefunken Gesellschait fiir Drahtlose Telegraphic-m. b. 11., Berlin, Germany, a corporation of Germany Application July 8, 1933, Serial No. 679,504

In Germany 16 Claims.

This invention relates to certain improvements upon a quartz crystal oscillator arrangement and particularly to apparatus having temperature regulating means confined within an evacuated vessel such as disclosed in German Patent No.

552,771. An object of this invention is to simplify and improve quartz crystal oscillators and is directed particularly to the means of supporting the crystal which is retained within a holder or setting that is confined within an evacuated vessel. In such apparatus for holding quartz crystals Whenever very high frequency stability is required it is necessary, on the one hand, to dispose the quartz crystal in a way and under circumstances as free from damping as possible, while, on the other hand, it should be fixed mechanically so that absolutely constant supporting is insured, seeing that no matter how slight the movement of the crystal inside its setting means, this will infallibly occasion more or less change in the frequency.

In order to secure such a condition, the quartz crystal, according to the present invention is so attached in lts supporting or setting means that the surfaces or faces of the oscillating quartz crystal will not contact the electrodes. In fact, the crystal is so set inside a supporting annulus between points in such a way that, when in its neutral zone, i. e., in the central or median plane of the quartz crystal it will be held under conditions free from damping.

The drawing shows the invention in a number of exemplified embodiments.

Fig. 1a is an elevation partly in section of a crystal having a continuous groove for retaining the crystal.

Fig. 1b is a plan view of a crystal having three notches for retaining the crystal.

Fig. 2 is a plan view partly in section of the crystal retaining ring having a single spring.

Fig. 2a is a detailed showing of the leaf spring for flexibly retaining the crystal.

Fig. 2b is a sectional view of the crystal retaining ring having three springs.

Fig. 3 is a sectional view of the complete quartz crystal oscillator arrangement.

In the form of construction illustrated in Fig. 1a the crystal has in its median plane a circumferential groove or notch. Instead of this, as shown in Fig. 1b, a plurality of tiny holes may be formed peripherally about the crystal. The supporting is then insured, for example, by means of three peaks or prongs engaging in the said groove or in the holes or depressions formed in the crystal.

July 22, 1932 Figs. 2, 2a. and 21) show the several ways of securing or setting of a quartz crystal Q in a manner as just described by the aid of the three peaks or prongs engaging in the said groove or in the holes or depressions formed in the crystal.

Referring now in detail to Fig. 2 there is shown the securing or setting of a quartz crystal Q by the aid of the three peaks or points Si, S2, S3 in a holder ring R. The said pea-ks may be united by screwing in the setting system fixedly or elastically. In the case of Fig. 2, for instance, only one of the said peaks, S3, is secured upon the leaf spring by the agency of which it is pressed against the crystal.

Fig. 3 shows a section laid through the assembly of crystal supporter means of the kind suited to be inserted into the vacuum vessel. The setting or holder means F which as disclosed in the parent German Patent No. 552,771, supports the heating winding WI and the measuring or calibrated winding W2 contains the quartz crystal Q which is held in the ring R as before described. E denotes the electrodes which are so set in the quartz that they will not directly touch the crystal. The holding ring R and the electrodes E are stayed in reference to each other by the insulating rings I1, I2, made of glass.

I claim:-

1. A quartz crystal oscillator comprising a housing completely enclosing a quartz crystal, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of springs having pointed members touching the periphery of said crystal.

2. A quartz crystal oscillator comprising a housing completely enclosing a quartz crystal, means for flexibly securing said crystal within said housing, said flexible securing means comprising three springs having pointed members touching the periphery of said crystal.

3. A quartz crystal oscillator comprising a housing completely enclosing a quartz crystal, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of springs having pointed members secured to a plurality of cone-like apertures on the periphery of said crystal.

4. A quartz crystal oscillator comprising a housing completely enclosing a disc-like quartz crystal, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of springs having pointed members secured to a circumferential groove on said crystalv 5. A quartz crystal oscillator comprising a housing completely enclosing a quartz crystal, a heating winding surrounding said housing, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of springs having pointed members touching the periphery of said crystal.

6. A quartz crystal oscillator comprising a housing completely enclosing a quartz crystal, means for flexibly securing said crystal within said housing, said flexible means comprising a plurality of pointed members secured to a leaf spring for pressing said pointed members against the periphery of said crystal.

7. A quartz crystal oscillator comprising a housing completely enclosing a quartz crystal, a central holding ring secured within said housing, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of springs having pointed members touching the periphery of said crystal. 8. A quartz oscillator comprising a housing completely enclosing a quartz crystal, a central holding ring secured within said housing, a quartz crystal interposed between an upper and lower electrode, means for flexibly securing said crystal Within said housing, said flexible securing means comprising a plurality of springs having pointed members touching the periphery of said crystal.

9. A quartz oscillator "comprising a housing completely enclosing a quartz crystal, a central holding ring secured within said housing, a quartz crystal interposed between an upper and'lower electrode, insulating rings spacing said electrodes, means for flexibly securing saidcrystal within said housing, said flexible securing means comprising a plurality of springs having pointed members touching the periphery of said crystal.

10. A quartz oscillator comprising a housing completely enclosing a quartz crystal, a central holding ring secured Within said housing, a quartz crystal interposed between an upper and lower electrode, insulating rings spacing said crystal and said holding ring from said electrodes, means for flexibly securing'said crystal Within said housing, said flexible securing means comprising a plurality of springs having pointed'members touching the periphery of said crystal;

11. A quartz crystal oscillator comprising a support for retaining a quartz crystal, means for flexibly securing said crystal to saidsupport, said flexible securing means comprising a plurality of springs having retaining members touching the periphery of said crystal. 7

12. A quartz crystal oscillator comprising a support for retaining a quartz crystal, means for flexibly securing said crystal to said support, said flexible securing means comprising a plurality of retaining members touching the periphery of said crystal, at least one of which comprises a spring.

13. A quartz crystal oscillator comprising a support for retaining a quartz crystal, means for flexibly securing said crystal to said support, said flexible securing means comprising a plurality of retaining members touching the periphery of said crystal, at least one of which comprises a laminated spring.

14. A quartz oscillator comprising a housing en- 1 closing a quartz crystal, a holding ring secured within said housing, ,a quartz crystal interposed between an upper and lower electrode, insulating rings spacing said electrodes, means for flexibly securing said crystal within said housing, said enclosing a quartz crystal, a holding ring secured within said housing, a quartz crystal interposed between an upper and lower electrode, insulating rings spacing said electrodes, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of retaining members touching the periphery of said crystal, at least one of Which comprises a'spring.

16. A quartz oscillator comprising a housing enclosing a quartz crystal, a holding ring secured within said housing, a quartz crystal interposed between an upper and lower electrode, insulating rings spacing said electrodes, means for flexibly securing said crystal within said housing, said flexible securing means comprising a plurality of retaining members touching the periphery of said crystal, at least one of which comprises a laminated spring.

RUDOLF BECHMANN.

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