PIEZOELECTRIC MODULE

• US 20130187723A1
• Filed: 01/22/2013
• Published: 07/25/2013
• Est. Priority Date: 01/23/2012
• Status: Active Grant

• Current Assignee: Nihon Dempa Kogyo Company Limited
• Original Assignee: Nihon Dempa Kogyo Company Limited
• Inventors: HARIMA, HIDENORI, ASAMURA, FUMIO
• Granted Patent: US 8,941,445 B2
• Time in Patent Office: Days
• US Class Current: 331/158
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/49175 Parallel arrangements
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 24/97 the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H03B 5/36 active element in amplifier being semiconductor device H03B5/323, H03B5/326 , H03B5/38 take precedence
• CPC Class Codes: H03H 9/0509 consisting of adhesive elements
• CPC Class Codes: H03H 9/0538 Constructional combinations of supports or holders with electromechanical or other electronic elements
• CPC Class Codes: H03H 9/0547 consisting of a vertical arrangement H03H9/0566 takes precedence
• CPC Class Codes: H03H 9/0585 consisting of an adhesive layer
• CPC Class Codes: H03H 9/1021 the BAW device being of the cantilever type
• CPC Class Codes: H03H 9/1071 the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the SAW device
• CPC Class Codes: H03H 9/17 having a single resonator crystal tuning forks H03H9/21

Abstract

A piezoelectric module includes a piezoelectric package and a circuit component package. The piezoelectric module includes a thermoset resin with solder particles interposed between a whole circumference of the opening end surface of the second depressed portion including the plurality of connecting terminals of the circuit component package and the outer bottom surface of the first depressed portion of the piezoelectric package. The plurality of external terminals of the piezoelectric package and the plurality of connecting terminals of the circuit component package are electrically connected by metal bonding. The whole circumference of the opening end surface of the second depressed portion of the circuit component package and the outer bottom surface of the first depressed portion of the piezoelectric package are bonded by melting and hardening of the thermoset resin that constitutes the thermoset resin with solder particles.

Claims

1. A piezoelectric module, comprising:

a piezoelectric package that houses a piezoelectric resonator; and

a circuit component package that houses a circuit component configured to generate an oscillation signal at a predetermined frequency based on a vibration signal of the piezoelectric resonator, and the piezoelectric package and the circuit component package are electrically and mechanically bonded, wherein

the piezoelectric package comprises;

a first depressed portion that is formed by a first bottom wall layer and a first frame wall layer, the first depressed portion housing the piezoelectric resonator;

a lid body that seals the first depressed portion; and

a plurality of external terminals configured to output the vibration signal of the piezoelectric resonator to an outer bottom surface of the first depressed portion;

the circuit component package comprises;

a second depressed portion that is formed by a second bottom wall layer and a second frame wall layer, the second depressed portion housing the circuit component; and

a plurality of connecting terminals disposed on an opening end surface of the second depressed portion, the plurality of connecting terminals being electrically connected to the plurality of respective external terminals on the outer bottom surface of the piezoelectric package;

the piezoelectric module comprises a thermoset resin with solder particles interposed between a whole circumference of the opening end surface of the second depressed portion and the outer bottom surface of the first depressed portion of the piezoelectric package, and the second depressed portion including the plurality of connecting terminals of the circuit component package;

the plurality of external terminals of the piezoelectric package and the plurality of connecting terminals of the circuit component package are electrically connected by a metal bonding,

the metal bonding employs melting and hardening of solder particles that constitute the thermoset resin with solder particles, and

the whole circumference of the opening end surface of the second depressed portion of the circuit component package and the outer bottom surface of the first depressed portion of the piezoelectric package are bonded by melting and hardening of the thermoset resin that constitutes the thermoset resin with solder particles.

2. The piezoelectric module according to claim 1, wherein

the first bottom wall layer and the first frame wall layer that constitute the first depressed portion of the piezoelectric package are made of a ceramics sheet, and

the second bottom wall layer and the second frame wall layer that constitute the second depressed portion of the circuit component package are made of a ceramics sheet.

3. The piezoelectric module according to claim 1, wherein

the first bottom wall layer, the first frame wall layer, and the lid body that constitute the first depressed portion of the piezoelectric package are made of a crystal plate.

4. The piezoelectric module according to claim 3, wherein

a rough surface treatment is performed on the outer bottom surface of the first bottom wall layer where at least a whole circumference of an opening end surface of the second depressed portion of the circuit component package, and

the melted solder particles and the melted thermoset resin are strongly bonded on the outer bottom surface of the first bottom wall layer of the piezoelectric package.

5. The piezoelectric module according to claim 4, wherein

the rough surface treatment performed surface has a plurality of minute unevenness that is strongly bonded by anchoring in a state where the melted solder particles and the melted thermoset resin are received and harden on the outer bottom surface of the first bottom wall layer of the piezoelectric package.

6. The piezoelectric module according to claim 1, wherein

the thermoset resin with solder particles for bonding the piezoelectric resonator and the circuit component package extends inside from the external terminal formed on the outer bottom surface of the piezoelectric resonator along the outer bottom surface, and

the outer bottom surface is disposed to cover the opening of the depressed portion of the circuit component package.

7. The piezoelectric module according to claim 1, wherein

the thermoset resin with solder particles for bonding the piezoelectric resonator and the circuit component package is filled from a side surface of the circuit component including a part of a top surface to a part of an inner bottom surface of the circuit component package housing the circuit component.

15. The piezoelectric module according to claim 1, further comprising:

at least one notch, the notch is disposed at one of four corners of the circuit component package;

a lead line on the circuit component package for the circuit component mounted in the circuit component package;

a mounting electrode disposed on the bottom surface of the circuit component package; and

a connecting electrode formed in the notch that electrically connects the mounting electrode to the lead line.

8. A piezoelectric module comprising:

a piezoelectric package that houses a piezoelectric resonator; and

a circuit component package that houses a circuit component configured to generate an oscillation signal at a predetermined frequency based on a vibration signal of the piezoelectric resonator, and the piezoelectric package and the circuit component package are electrically and mechanically bonded, wherein

the piezoelectric package comprises;

a first depressed portion that is formed by a first bottom wall layer and a first frame wall layer, the first depressed portion housing the piezoelectric resonator;

a lid body that seals the first depressed portion; and

a plurality of external terminals configured to output the vibration signal of the piezoelectric resonator to an outer bottom surface of the first depressed portion;

the circuit component package comprises;

a second depressed portion that is formed by a second bottom wall layer and a second frame wall layer, the second depressed portion housing the circuit component; and

a plurality of connecting terminals disposed on an opening end surface of the second depressed portion, the plurality of connecting terminals being electrically connected to the plurality of respective external terminals on the outer bottom surface of the piezoelectric package;

the piezoelectric module comprises an anisotropic conductive layer interposed between a whole circumference of the opening end surface of the second depressed portion and the outer bottom surface of the first depressed portion of the piezoelectric package, and the second depressed portion including the plurality of connecting terminals of the circuit component package;

the plurality of external terminals of the piezoelectric package and the plurality of connecting terminals of the circuit component package are electrically connected by a bridging bonding,

the bridging bonding forms a bridge by interposing a conductive filler constituting the anisotropic conductive layer by pressurization and heating at fabrication, and

the whole circumference of the opening end surface of the second depressed portion of the circuit component package and the outer bottom surface of the first depressed portion of the piezoelectric package are bonded by melting and hardening of a thermoset resin that constitutes the anisotropic conductive layer.

9. The piezoelectric module according to claim 8, wherein

the first bottom wall layer and the first frame wall layer that constitute the first depressed portion of the piezoelectric package are made of a ceramics sheet, and

the second bottom wall layer and the second frame wall layer that constitute the second depressed portion of the circuit component package are made of a ceramics sheet.

10. The piezoelectric module according to claim 8, wherein

the first bottom wall layer, the first frame wall layer, and the lid body that constitute the first depressed portion of the piezoelectric package are made of a crystal plate, and

the second bottom wall layer and the second frame wall layer that constitute the second depressed portion of the circuit component package are made of a ceramics sheet.

11. The piezoelectric module according to claim 10, wherein

a rough surface treatment is performed on the outer bottom surface of the first bottom wall layer where at least a whole circumference of an opening end surface of the second depressed portion of the circuit component package, and

the melted conductive filler and the melted thermoset resin are strongly bonded on the outer bottom surface of the first bottom wall layer of the piezoelectric package.

12. The piezoelectric module according to claim 11, wherein

the rough surface treatment performed surface has a plurality of minute unevenness that is strongly bonded by anchoring in a state where the melted thermoset resin is received and harden on the outer bottom surface of the first bottom wall layer of the piezoelectric package.

13. The piezoelectric module according to claim 8, wherein

the anisotropic conductive layer for bonding the piezoelectric resonator and the circuit component package extends inside from the external terminal formed on the outer bottom surface of the piezoelectric resonator along the outer bottom surface, and

the outer bottom surface is disposed to cover the opening of the depressed portion of the circuit component package.

14. The piezoelectric module according to claim 8, wherein

the anisotropic conductive layer for bonding the piezoelectric package and the circuit component package is filled from a side surface of the circuit component including a part of a top surface to a part of an inner bottom surface of the circuit component package housing the circuit component.