crystal oscillator

Abstract

To provide a quartz crystal oscillator capable of accurately measuring temperature. [Solution] In a quartz crystal unit (100), a housing (110) includes a first housing (111) and a second housing (112). A pad (120) is disposed on the outer surface of the second housing. A resonant crystal blank (130) includes two thick portions (132) and a thin portion (133) whose ends are connected to the two thick portions. The two thick portions are sandwiched between the first and second housings. A sealed first space (P1) is formed between the inner surface (113) of the first housing and the thin portions of the resonant crystal blank, and a sealed second space (P2) is formed between the inner surface (114) of the second housing and the thin portions of the resonant crystal blank. A thermistor (140) is disposed in the first space or the second space and is electrically connected to the pad.

Description

[Technical Field]

[0001] The present invention relates to a vibration device, and more particularly to a quartz crystal resonator. [Background technology]

[0002] A conventional quartz crystal unit includes a housing, a resonant quartz crystal blank, and a thermistor. The resonant quartz crystal blank is located inside the housing, and the thermistor is located outside the housing, so the thermistor cannot accurately measure the temperature of the resonant quartz crystal blank, and the volume of the quartz crystal unit becomes excessively large. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides a quartz crystal unit that can accurately measure temperature. [Means for solving the problem]

[0004] The crystal unit of the present invention includes a housing, pads, a resonant crystal blank, and a thermistor. The housing includes a first housing and a second housing. The pads are disposed on the outer surface of the second housing. The resonant crystal blank includes two thick portions and a thin portion whose ends are connected to the two thick portions. The two thick portions are sandwiched between the first housing and the second housing. A sealed first space is formed between the inner surface of the first housing and the thin portions of the resonant crystal blank, and a sealed second space is formed between the inner surface of the second housing and the thin portions of the resonant crystal blank. The thermistor is disposed in the first space or the second space and is electrically connected to the pads. [Effects of the Invention]

[0005] Based on the above, the thermistor of the crystal unit of the present invention is located inside the housing and is close to the resonant crystal blank inside the housing, so it can accurately measure the temperature of the resonant crystal blank.The thermistor located inside the housing also allows the volume of the crystal unit to be reduced. [Brief explanation of the drawings]

[0006] [Figure 1] 1 is a schematic diagram of a quartz crystal resonator according to an embodiment of the present invention; [Figure 2] FIG. 2 is a schematic diagram of a quartz crystal resonator according to another embodiment of the present invention. [Figure 3] FIG. 2 is a schematic diagram of a quartz crystal resonator according to another embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram of a quartz crystal resonator according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] FIG. 1 is a schematic diagram of a quartz crystal unit according to one embodiment of the present invention. Referring to FIG. 1, the quartz crystal unit 100 includes a housing 110, a pad 120, a resonating crystal blank 130, and a thermistor 140. The housing 110 includes a first housing 111 and a second housing 112. The pad 120 is disposed on an outer surface 115 of the second housing 112. The resonating crystal blank 130 includes two thick portions 132 and a thin portion 133, and both ends of the thin portion 133 are connected to the two thick portions 132, respectively. The two thick portions 132 are disposed between the first housing 111 and the second housing 112.

[0008] A sealed first space P1 is formed between the inner surface 113 of the first housing 111 and the thin portion 133 of the resonant crystal blank 130, and a sealed second space P2 is formed between the inner surface 114 of the second housing 112 and the thin portion 133 of the resonant crystal blank 130. The inner surface 114 of the second housing 112 corresponds to the outer surface 115. The thermistor 140 is disposed in the first space P1 or the second space P2 and is electrically connected to the pad 120. The pad 120 is located outside the second space P2.

[0009] The thermistor 140 is disposed closer to the resonant crystal blank 130 within the housing 110, allowing for more accurate measurement of the temperature of the resonant crystal blank 130. The thermistor 140 is, for example, a thin-film thermistor 140, which allows for a reduction in the volume of the crystal unit 100. The number of pads 120 is, for example, two, but is not limited to this.

[0010] The quartz crystal unit 100 further includes a circuit structure 150, with both ends 151 and 152 connected to the pad 120 and the thermistor 140, respectively. The circuit structure 150 penetrates a portion of the housing 110. The thermistor 140 is electrically connected to the pad 120 via the circuit structure 150. In this embodiment, the thermistor 140 is disposed within the first space P1 and located between the first housing 111 and the resonant crystal blank 130. The housing 110 includes an inner flat surface 117, which is the inner surface 113 of the first housing 111. The thermistor 140 is disposed on the inner flat surface 117 (inner surface 113) of the first housing 111, facing the resonant crystal blank 130. Because the thermistor 140 is closer to the resonant crystal blank 130, it can more accurately measure the temperature of the resonant crystal blank 130. An intermediate portion 153 between both ends 151, 152 of the circuit structure 150 passes through at least one of the two thick portions 132 of the resonator crystal blank 130 and the second housing 112. In this embodiment, the intermediate portion 153 passes through the two thick portions 132.

[0011] A groove 131 is formed between the two thick portions 132 and the thin portion 133 of the resonant crystal blank 130, forming a neck structure of the resonant crystal blank 130. The thermistor 140 corresponds to the groove 131. Because the housing 110 and the resonant crystal blank 130 are made of quartz, the expansion coefficients of the sealed housing 110 (housing 110) and the resonant crystal blank 130 can be made the same.

[0012] In conventional crystal resonators, the sealed housing and the resonant crystal blank are made of different materials, resulting in different expansion coefficients. As the temperature of the conventional crystal resonator increases or decreases, the frequency changes of the sealed housing and the resonant crystal blank do not match, resulting in hysteresis and affecting the accuracy of the conventional crystal resonator. In this embodiment, the housing 110 and the resonant crystal blank 130 of the crystal resonator 100 have the same expansion coefficient (i.e., are made of the same material), so as the temperature of the crystal resonator 100 increases or decreases, the frequency changes of the housing 110 and the resonant crystal blank 130 match, resulting in better accuracy.

[0013] The quartz crystal unit 100 further includes two sealing rings 160. One sealing ring 160 is disposed between the first housing 111 and the two thick portions 132 of the resonant crystal blank 130, and the other sealing ring 160 is disposed between the second housing 112 and the two thick portions 132 of the resonant crystal blank 130, thereby sealing the gap between the housing 110 and the resonant crystal blank 130.

[0014] FIG. 2 is a schematic diagram of a quartz crystal unit according to another embodiment of the present invention. Referring to FIGS. 1 and 2 simultaneously, the quartz crystal unit 100a of this embodiment is similar to the previously described embodiment. The difference between the two is that the inner surface 113a of the first housing 111a in this embodiment includes a groove 116 recessed toward the interior of the first housing 111a and away from the resonant crystal blank 130. The thermistor 140 is disposed within the groove 116. The groove 116 provides the housing 110a with more space, making it easier for technicians to assemble the quartz crystal unit 100a. The circuit structure 150a located within the first space P1 extends along the surface of the groove 116 and is connected to the thermistor 140. The quartz crystal unit 100a of this embodiment has the same effects as the previously described embodiment, and therefore will not be described again.

[0015] FIG. 3 is a schematic diagram of a quartz crystal unit according to another embodiment of the present invention. Referring to FIGS. 1 and 3 simultaneously, the quartz crystal unit 100b of this embodiment is similar to the previously described embodiment, with the difference being that the thermistor 140 in this embodiment is disposed within the second space P2. Here, the inner flat surface 117 of the housing 110 is the inner surface 114 of the second housing 112. The thermistor 140 is disposed on the inner surface 114 (inner flat surface 117) of the second housing 112. The intermediate portion 153 between the two ends 151, 152 of the circuit structure 150b penetrates only the second housing 112. The quartz crystal unit 100b of this embodiment has the same effects as the previously described embodiment, and therefore will not be described here.

[0016] FIG. 4 is a schematic diagram of a quartz crystal unit according to another embodiment of the present invention. Referring to FIGS. 3 and 4 simultaneously, the quartz crystal unit 100c of this embodiment is similar to the previously described embodiment. The difference between the two is that the inner surface 114c of the second housing 112c in this embodiment has a groove 116c recessed toward the interior of the second housing 112c and away from the resonant quartz crystal blank 130. The thermistor 140 is disposed in the groove 116c. The circuit structure 150c located in the second space P2 extends along the surface of the groove 116c and is connected to the thermistor 140. The quartz crystal unit 100c of this embodiment has the same effects as the previously described embodiment, so a detailed description will be omitted here.

[0017] In summary, the thermistor of the crystal unit of the present invention is located inside the housing and is close to the resonant crystal blank inside the housing, so it can accurately measure the temperature of the resonant crystal blank. The volume of the crystal unit can also be reduced by using the thermistor located inside the housing. [Industrial Applicability]

[0018] The quartz crystal resonator of the present invention can accurately measure temperature. [Explanation of symbols]

[0019] P1: 1st space P2: 2nd space 100, 100a, 100b, 100c: Crystal resonator 110, 110a, 110c: Housing 111, 111a: First enclosure 112, 112c: Second enclosure 113, 113a, 114, 114c: inner surface 115: Exterior 116, 116c: Concave groove 117: Internal flat surface 120: Pad 130: Resonant crystal piece 131: Groove 132:Thick part 133: Thin section 140: Thermistor 150, 150a, 150b, 150c: Circuit structure 151, 152: Edge 153: Middle section 160: Sealing ring

Claims

1. a housing including a first housing and a second housing; a pad disposed on an outer surface of the second housing; a resonant crystal element including two thick portions and thin portions connected to the two thick portions, the two thick portions being sandwiched between the first housing and the second housing, the resonant crystal element forming a sealed first space between the inner surface of the first housing and the thin portions of the resonant crystal element, and the resonant crystal element forming a sealed second space between the inner surface of the second housing and the thin portions of the resonant crystal element; a thermistor disposed in the first space or the second space and electrically connected to the pad; , including a quartz crystal.

2. The thermistor is disposed in the first space.

2. The quartz crystal resonator according to claim 1.

3. the thermistor is disposed on the inner surface of the first housing.

3. The quartz crystal resonator according to claim 2.

4. The inner surface of the first housing has a groove recessed toward the inside of the first housing in a direction away from the resonant crystal piece, and the thermistor is disposed in the groove.

4. The quartz crystal resonator according to claim 3.

5. the thermistor is disposed in the second space.

2. The quartz crystal resonator according to claim 1.

6. the thermistor is disposed on the inner surface of the second housing.

6. The quartz crystal resonator according to claim 5.

7. The inner surface of the second housing has a groove recessed toward the inside of the second housing in a direction away from the resonant crystal piece, and the thermistor is disposed in the groove.

7. The quartz crystal resonator according to claim 6.

8. The housing and the resonant crystal element are made of quartz.

2. The quartz crystal resonator according to claim 1.

9. further comprising two sealing rings, one of which is disposed between the first housing and the two thick portions of the resonant crystal blank, and the other of which is disposed between the second housing and the two thick portions of the resonant crystal blank.

2. The quartz crystal resonator according to claim 1.

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