JPS6388619A - Crystal resonator temperature control device and crystal resonator temperature control element - Google Patents

Abstract

PURPOSE:To stabilize an oscillation frequency and to attain the easily arrival at a constant temperature condition by supplying a current to a thermoelectric converting element so that a crystal resonator can be maintained to a prescribed temperature based on the signal obtained from a temperature detecting means. CONSTITUTION:The temperature of a crystal resonator 2 detected by a temperature detecting edge 3 is removed by a lead wire 4 as a signal and the signal is supplied to the input side of a comparator 13. The signal is compared with the resistance value of a reference resistor, and when the difference between these two resistance values is absent, a signal (OFF signal) to stop the current supplying from a power source to a thermoelectric converting element is sent from the output side of the comparator 13. On the other hand, when the difference between two resistance values is present, a signal (ON signal) to supply the current from the power source to the thermoelectric converting element is sent from the output side of the comparator 13. The sent ON signal is supplied to an ON-OFF switch 14, and then, the current is supplied from the power source to the thermoelectric converting element. When the signal is an ON signal, a power source changing-over switch 15 reversely rotates the direction of the current supplied to the thermoelectric converting element when the environment temperature of the thermoelectric converting element is higher and lower than the set temperature.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a device for keeping the oscillation frequency of a crystal resonator constant by keeping the crystal resonator at a predetermined temperature using a thermoelectric conversion device, and temperature a, II used in the device. Concerning Gomotoko. [Prior Art] Conventionally, as a method for stabilizing the oscillation frequency of a crystal resonator, a method has been adopted in which the crystal resonator is housed in a constant-temperature casing that is maintained at a temperature a higher than the environmental temperature in which the crystal resonator is used. It is coming. In this method, the temperature of the casing is controlled in a temperature range where the rate of change of the oscillation frequency relative to the temperature change of the constant-temperature casing, that is, the temperature change of the crystal resonator, is relatively large, so it is difficult to stabilize the frequency. This method is not always satisfactory, and has disadvantages such as the fact that it takes time to heat the casing to a predetermined temperature that is set higher than the environmental temperature. [Problems to be Solved by the Present Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to further stabilize the oscillation frequency of a crystal resonator, and to An object of the present invention is to provide a small-sized crystal resonator temperature control device that can quickly reach a constant temperature state. [Means for Solving the Problems] According to the present invention, the object is to provide a crystal oscillator, and a structure in which the quartz crystal oscillator is attached to one of the heat absorbing/radiating plates in order to adjust the temperature of the crystal oscillator. a thermoelectric conversion element provided to detect the temperature of the crystal resonator; and a temperature detection means provided to detect the temperature of the crystal resonator; This is accomplished by a crystal oscillator temperature control device comprising means for supplying current to the element. The crystal resonator used in the present invention includes a crystal piece cut into a shape, size, and orientation suitable for the purpose of use, and an electrode closely attached to the surface of the crystal piece to apply an electric field to the crystal piece. and a terminal connected to this electrode. The crystal resonator used in the present invention includes both a crystal resonator used as an oscillator and a crystal camera element used as a resonator. The thermoelectric conversion element used in the device or element of the present invention has the so-called Bertier effect, which causes thermal energy to flow from one heat-absorbing/heat-radiating plate to the other heat-absorbing/heat-radiating plate by electrical energy. Among the elements utilized, a thermoelectric conversion element comprising a P-type semiconductor and an N-type semiconductor arranged between one heat-absorbing/heat-radiating plate and the other heat-absorbing/heat-radiating plate is preferable. In this case, an appropriate number of P-type semiconductors and N-type semiconductors are electrically connected in series as desired. If desired, it is also possible to use a so-called cascade type thermoelectric conversion element by sequentially attaching another thermoelectric conversion element or a plurality of thermoelectric conversion elements to either one of the heat absorption/heat dissipation plates. In addition, in order to improve the heating rate or cooling rate of the thermoelectric conversion element, it is preferable to provide fins on the heat absorbing/heat dissipating plate located on the opposite side of the heat absorbing/heat dissipating plate to which the crystal oscillator is attached. Fins can be provided separately or separately. The temperature detection means in the present invention is installed in the device or element of the present invention.

[It consists of a temperature detection end that can be opened, and a transmission section (lead wire) that transmits the physical signal corresponding to the temperature detected by the detection end as a signal. Further, the temperature detection means may be a means constituted by a thermoelectric conversion element that exhibits the See"Beck effect. Furthermore, the current supply means used in the element 81 of the present invention may be obtained from the temperature detection means. Based on the signal
Comparing means for comparing the temperature of the crystal resonator with a reference temperature (preset temperature) and sending the result as a comparison result signal, and means for turning on and off the current flowing to the thermoelectric conversion element based on this comparison result signal. or a 1″ current limiting circuit that receives the comparison signal and sets the current flowing from the power source to the thermoelectric conversion element to zero when there is no temperature difference, and flows a large current to the thermoelectric conversion element as the temperature difference increases; The crystal resonator temperature control element of the present invention is comprised of means for switching the direction of current flowing to the thermoelectric conversion element according to the environmental temperature in which the crystal resonator temperature control element is arranged, and a power supply that supplies current to the thermoelectric conversion element. The 'a element consists of a crystal resonator, a temperature detection means, a thermoelectric conversion element, and an hX. [Specific Examples] The present invention will be explained in more detail below using preferred specific examples shown in the drawings. In Fig. 1, One heat absorption/heat dissipation plate 6 of the thermoelectric conversion element
A crystal resonator 2 is bonded to the quartz crystal resonator 2 . In addition, crystal oscillator 2
The temperature detection end 3 of the temperature detection means is attached to the surface facing the heat absorption/heat dissipation plate 6, and the temperature of the crystal resonator is taken out as a signal by the lead wire 4, and this signal is sent to the input side of the comparator 13. is supplied to. P-type semiconductors 8 and N-type semiconductors 9 for thermoelectric conversion are alternately arranged between one heat absorption/heat dissipation plate 6 and the other heat absorption/heat dissipation plate 7 of the thermoelectric conversion element, and terminals 11 and Semiconductor elements 8 and 9 alternately arranged between terminals 12 are electrically connected in series. Terminal 11 and terminal 12 are electrically connected to current supply means 16 . When maintaining the crystal oscillator 2 at a predetermined set temperature by the heat absorption/exothermic effect of the electric energy supplied from the current supply means 16 to the thermoelectric conversion element, the rate of heat supply to the crystal oscillator 2 or from the crystal oscillator 2 In order to improve the rate of heat release, the other heat absorbing/radiating plate 7 of the thermoelectric conversion element is provided with fins. A thermally conductive adhesive, such as an adhesive made of epoxy resin with good thermal conductivity, can be used to bond the crystal camera 2 and one of the heat absorbing/radiating plates 6. Fillers such as alumina may be mixed in to improve the thickness. When attaching the temperature detection end 3 to the surface of the crystal sensor 2, attach the temperature detection end 3 to the surface of the crystal sensor 2 and the surface of the temperature detection end 3 with the temperature detection end 3 in contact with the surface of the crystal resonator 2. It may be bonded to the heat absorbing/heat dissipating plate 6 by applying an adhesive. As the temperature detecting end 3, a resistance type detecting end such as a thermistor can be used. In addition, by insulating a part of the PT and N-type semiconductor elements of the thermoelectric conversion element of the present invention from other P-type and N-type semiconductor elements to configure a thermoelectric conversion element that exhibits the Seebeck effect, crystal oscillation can be achieved. It can also be used as a means to detect the child's temperature. One heat absorbing/heat dissipating plate 6, the other heat absorbing/heat dissipating plate 7, a P-type semiconductor element 8 disposed between these two heat absorbing/heat dissipating plates,
The semiconductor element 9 and the fin 10 constitute a thermoelectric conversion element, and the crystal oscillator 2, the temperature detection terminal 3, and the -1-2 wire 4 and the thermoelectric conversion cord connected to the temperature detection terminal 3 are connected to the crystal oscillator 2, the temperature detection terminal 3, and the thermoelectric conversion element. A temperature control element cord 1 is configured. Target temperature to keep the temperature of the crystal oscillator 2 constant, f
Although it is possible to arbitrarily select the set temperature, in the present invention, the set temperature is set to 40° C., where the oscillation frequency fluctuation due to the temperature of the crystal resonator 2 is the least. For example, if a resistance type detection terminal is used as the temperature detection terminal 3, a reference resistor is built in the comparator 13, which can be compared with the resistance value indicated by the detection terminal 3 at a set temperature of 40°C. Ru. The humidity of the crystal oscillator 2 detected by the temperature detection end 3 is taken out as a signal by the lead wire 4, which signal is supplied to the input side (2) of the comparator 13. If there is no difference between these two resistance values, a signal (OF signal) that blocks the current supply from the power supply to the thermoelectric conversion element is sent from the output side of the comparator 13. If there is a difference between the two resistance values, 13f:
, current is supplied from the power supply to the thermoelectric conversion element 1! signal (O
N signal) is sent out from the output side of the comparator 13.
A comparator 13 is configured. When the ON signal sent from the comparator 13 is supplied to the 0N-0[-F switch 14, a current is supplied from a power source (not shown) to the thermoelectric conversion rope. When the signal sent from the comparator 13 is an ON signal, the power selector switch 15 indicates that the ambient temperature of the thermoelectric conversion element is 40°C.
The direction of the current supplied to the thermoelectric conversion element is configured to be reversed depending on whether the environmental temperature of the thermoelectric conversion element is higher than 40°C or lower than 40°C. Instead of the above-mentioned 0N-OFF switch, the current control circuit 1
4 is used, the M flow control circuit 14
When a difference signal as a comparison result signal from No. 3 is received, when there is no humidity difference, the current flowing to the thermoelectric conversion element is set to zero, and as the temperature difference increases, it operates in the same way as an ON-OFF switch. In the electrical connection in the thermoelectric conversion element shown in the figure, when the negative electrode of the power source is connected to the terminal 11 and the positive electrode is connected to the terminal 12, the heat absorption/heat dissipation plate 6 is cooled, and the heat absorption/heat dissipation plate 7 is cooled. generates fever. That is, the electrical energy supplied from the power supply has a cooling effect on the crystal resonator 2 joined to the heat absorbing/radiating plate 6. On the contrary, when the negative terminal of the power source is connected to the terminal 12 and the positive terminal to the terminal 11, the heat absorbing/heat dissipating plate 6' generates heat and the heat absorbing/heat dissipating plate 1 is cooled. That is, the electrical energy supplied from the power supply has a heating effect on the crystal resonator 2 joined to the heat absorbing/radiating plate 6. Therefore, the power switching switch 3715 is
When the temperature is higher than 0°C, the positive pole of the power supply is connected to terminal 11 and the negative pole is connected to terminal 12, and when the environmental temperature is lower than 40°C, the positive pole of the power supply is connected to terminal 12, and the negative pole is connected to terminal 1.
1, respectively. The comparator 13, the ON-OFF switch 14 or the current control circuit 14, the power changeover switch 15, and the N source (not shown) constitute a power supply means 16. In the crystal resonator temperature control device and crystal resonator temperature control element of the present invention, if the temperature difference between the set temperature and the environmental temperature is Whether to maintain or break is determined by the heating capacity or G of the thermoelectric conversion element used in the device of the present invention or the cold FA capacity "J". The ability to improve the internal resistance of P-type and N'fu semiconductor elements used in thermoelectric conversion elements, the shape and dimensions of these semiconductor elements, and the heat treatment ability of thermoelectric conversion elements under certain current conditions. Determined by the presence or absence of etc. In the device and element of the present invention, i! By appropriately selecting the shape, dimensions, and internal resistance of the N-type semiconductive coupling r, and by adopting means such as attaching fins to the heat absorption/radiation plate, the temperature difference equivalent to 30°C to 40°C can be reduced. Possesses the heat treatment ability of light to
The crystal resonator is always maintained at a set temperature of 40°C under an environmental temperature of 70°C. Since the device of the present invention is configured as described above, when it is installed, for example, in an automatic @, etc., even if the temperature of the U eaves is 70°C, the temperature detection end 3 If the temperature is 40'C (, -, then the current i from the power supply is
J (supplied to the thermoelectric conversion element, cooling effect of the thermoelectric conversion element (double T), the crystal oscillator is always maintained at a constant temperature of 40°C, and the frequency oscillated from the crystal oscillator is kept constant. In addition, when the environmental temperature at the location is 0°C, the temperature of the temperature detection end 3 is 40°C.
℃, current is supplied from the source 7 to the thermoelectric conversion element, and due to the heating action of the thermoelectric conversion element, the crystal resonator is always maintained at the set temperature of 40℃, and the frequency oscillated from the crystal resonator is always kept constant. The device and element of the present invention may be a modified version of the crystal resonator temperature control device and crystal resonator temperature control element shown in FIG. It can be a temperature control device or a quartz crystal temperature control element. FIG. 2 shows a specific example of a crystal resonator temperature control module using cascade type thermoelectric conversion elements. Between the two heat absorption/heat dissipation plates 24 and 25, and between the heat absorption/heat dissipation plates 25
, 28, respectively, a P-type semiconductor element 26 and an N-type semiconductor element 21 are arranged in the cross section 1, and the semiconductor elements 26 and 27 are electrically connected in series. A fin 29 is attached to the heat absorption/heat dissipation plate 28 to increase the heat treatment rate to form a thermoelectric conversion element, and a temperature detection means 22, 23 such as a crystal oscillator 21 is attached to the heat absorption/heat dissipation plate 24 to adjust the crystal vibration end temperature. A control element 20 is obtained. As shown in Figure 2, a crystal oscillator temperature control element (using one or three heat absorption/TFI and a thermoelectric conversion element using thermoelectricity, with four heat absorption/heat dissipation plates placed) was used. A cascade type in which 1) type semiconductor elements and N type semiconductor elements are arranged alternately between two opposing heat absorbing/heat dissipating plates, and these two types of semiconductor elements are electrically connected in series. A cascade type crystal oscillator temperature control element is a thermoelectric conversion element equipped with a crystal oscillator and temperature detection means. [Effects of the Invention] According to the crystal oscillation temperature control device configured as described above, the crystal oscillator is maintained at the set temperature of 40°C, which has the least frequency change with respect to temperature changes. The oscillation frequency of the ￥A element can be stabilized. Furthermore, since the crystal oscillator is not held at a relatively high temperature as in the prior art, the life of the crystal oscillator can be extended and the generation of noise can be effectively prevented. Unlike conventional technology, which maintains the temperature of the crystal oscillator by indirect heating, because the crystal oscillator is directly bonded to the thermoelectric conversion element, the temperature rises rapidly, the temperature rises sharply, and the steady state of 40°C is achieved in a short period of time. It is possible to reach r:.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a preferred specific example of the device of the present invention;
FIG. 2 is an explanatory diagram of an example of a member of the cable according to the present invention. 1,20...Crystal resonator temperature control element, ? ,2
1... Crystal resonator, 3, 22... Temperature detection end, 4, 23... Lead wire, 6.7, 24
, 25.28... Heat absorption/radiation plate, 8,2G...
...P-type semiconductor element, 9.21...N-type semiconductor element, 10, 29...Fin, 13...
... Comparator, 14 ... 0N-OFF switch is a temperature control circuit), 15 ... Power supply changeover switch, 16 ... Current supply means. Fermented person 4 meme 8 defense 7-tne-7 human fP Rijotsuki 1 Yoshio Kuchi

Claims (6)

[Claims] (1) A crystal resonator, a thermoelectric conversion element to which the crystal resonator is attached to one of the heat absorbing/radiating plates in order to adjust the temperature of the crystal resonator, and a thermoelectric conversion element installed to detect the temperature of the crystal resonator. A crystal resonator temperature control device comprising a temperature detecting means obtained from the temperature detecting means, and means for supplying current to the thermoelectric conversion element in order to maintain the crystal resonator at a predetermined temperature based on the signal obtained from the temperature detecting means. (2) The thermoelectric conversion elements are arranged alternately between one heat absorbing/heat dissipating plate, the other heat absorbing/heat dissipating plate disposed opposite to this, and these two heat absorbing/heat dissipating plates. 2. The crystal resonator temperature control device according to claim 1, comprising a type semiconductor element and an N type semiconductor element. (3) The thermoelectric conversion element is arranged alternately between a first heat absorption/heat dissipation plate, a second heat absorption/heat dissipation plate disposed opposite thereto, and these two heat absorption/heat dissipation plates. A member consisting of a P-type semiconductor element and an N-type semiconductor element is stacked with at least one member in which a P-type semiconductor element and an N-type semiconductor element are alternately attached to a third heat absorption/heat dissipation plate. A crystal resonator temperature control device according to claim 1, characterized in that: (4) A crystal resonator, a thermoelectric conversion element to which the crystal resonator is attached to one of the heat absorbing/radiating plates in order to adjust the temperature of the crystal resonator, and a thermoelectric conversion element installed to detect the temperature of the crystal resonator. A crystal oscillator temperature control element comprising a temperature detecting means. (5) The thermoelectric conversion elements are arranged alternately between one heat absorbing/heat dissipating plate, the other heat absorbing/heat dissipating plate disposed opposite to this, and these two heat absorbing/heat dissipating plates. The crystal resonator temperature control element according to claim 4, characterized in that it comprises a type semiconductor element and an N type semiconductor element. (6) The thermoelectric conversion elements are arranged alternately between a first heat absorption/heat dissipation plate, a second heat absorption/heat dissipation plate disposed opposite thereto, and these two heat absorption/heat dissipation plates. A member consisting of a P-type semiconductor element and an N-type semiconductor element is stacked with at least one member in which a P-type semiconductor element and an N-type semiconductor element are alternately attached to a third heat absorption/heat dissipation plate. A crystal resonator temperature control element according to claim 4, characterized in that: