Thermostatic type crystal oscillator

1. A thermostatic type crystal oscillator comprising:

a crystal resonator including an IT-cut crystal blank;

a vibration control circuit configured to control a vibration frequency of the crystal resonator;

a temperature regulator configured to regulate a temperature of the crystal resonator within a set temperature range by repeating heating and cooling to the crystal resonator;

a heat conducting plate configured to function as a heat absorbing plate and a heat dissipating plate for the temperature regulator;

a temperature control circuit configured to control a temperature of the temperature regulator; and

a housing that accommodates the crystal resonator, wherein

the housing defines, inside the housing, a resonator accommodating space in which the crystal resonator is accommodated,

the temperature regulator is a Peltier element configured to be capable of forcibly heating and forcibly cooling the crystal resonator, and

the temperature range is set within a range of 30° C. to 50° C.

2. The thermostatic type crystal oscillator according to claim 1 , wherein the temperature regulator and the heat conducting plate are disposed in the resonator accommodating space.

3. The thermostatic type crystal oscillator according to claim 2 , wherein

the housing includes:

a base having an opening portion and on which the crystal resonator is mounted; and

a cover that seals the opening portion, wherein the cover includes:

a front surface facing external environmental space of the housing; and

a back surface facing the resonator accommodating space.

4. The thermostatic type crystal oscillator according to claim 3 , wherein

one surface of the temperature regulator is attached to the back surface of the cover,

another surface of the temperature regulator is attached to the heat conducting plate, and

an opposite side surface of a surface of the heat conducting plate to which the temperature regulator is attached is directed to the crystal resonator.

5. The thermostatic type crystal oscillator according to claim 4 , wherein

the base includes:

a mounting surface on which the crystal resonator is mounted; and

an abutting surface on which the heat conducting plate abuts.

6. The thermostatic type crystal oscillator according to claim 5 , wherein, when viewed from a front-back direction of the cover, the abutting surface is disposed on an outer side of the mounting surface.

7. The thermostatic type crystal oscillator according to claim 6 , wherein, in a front-back direction of the cover, the abutting surface is disposed closer to the cover side than the mounting surface.

8. The thermostatic type crystal oscillator according to claim 7 , wherein, in the front-back direction, a distance between the cover and the crystal resonator is larger than a distance between the cover and the abutting surface.

9. The thermostatic type crystal oscillator according to claim 2 , wherein the heat conducting plate abuts on the crystal blank.

10. The thermostatic type crystal oscillator according to claim 9 , wherein

the crystal blank includes a thick portion and a thin portion that is thinner than the thick portion, and

the heat conducting plate abuts on the thick portion.

11. The thermostatic type crystal oscillator according to claim 2 , wherein the heat conducting plate faces the crystal resonator with a gap interposed between the heat conducting plate and the crystal resonator.

12. The thermostatic type crystal oscillator according to claim 2 , wherein the temperature regulator is mounted on the crystal blank.

13. The thermostatic type crystal oscillator according to claim 1 , wherein

the housing includes:

a base having an opening portion and on which the crystal resonator is mounted; and

a cover that seals the opening portion, wherein the cover includes:

a front surface facing external environmental space of the housing; and

a back surface facing the resonator accommodating space,

one surface of the temperature regulator is attached to the front surface of the cover, and

another surface of the temperature regulator is attached to the heat conducting plate.

14. The thermostatic type crystal oscillator according to claim 1 , wherein

the housing includes:

a base having a first opening portion and a second opening portion and in which the crystal resonator is accommodated;

a first cover that seals the first opening portion; and

a second cover that seals the second opening portion, and the temperature regulator is attached to the first cover.

15. The thermostatic type crystal oscillator according to claim 14 , wherein

the first cover includes:

a front surface facing external environmental space of the housing; and

a back surface facing the resonator accommodating space, and

the temperature regulator is attached to the front surface of the first cover, and

the crystal resonator is mounted on the back surface of the first cover.

16. The thermostatic type crystal oscillator according to claim 1 , wherein an atmosphere of the resonator accommodating space is a vacuum atmosphere.

17. The thermostatic type crystal oscillator according to claim 1 , wherein the housing accommodates the vibration control circuit and the temperature control circuit.

18. The thermostatic type crystal oscillator according to claim 17 , wherein

the housing defines, inside the housing, a circuit accommodating space in which the vibration control circuit and the temperature control circuit are accommodated, and

the resonator accommodating space is isolated from the circuit accommodating space.

19. The thermostatic type crystal oscillator according to claim 1 , further comprising an extraction circuit configured to extract a B-mode signal of the crystal resonator, wherein

the temperature control circuit is configured to control a current flowing through the temperature regulator, based on the B-mode signal.