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US 6,229,249 B1Granted
Surface-mount type crystal oscillator
AssigneeKYOCERA Corporation
InventorsHidefumi Hatanaka, Ryouma Sasagawa, Hideomi Yonemura, Naoki Hayashi
Life of this patent
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Abstract
In a surface-mount type crystal oscillator according to the invention, a part of side surfaces of a lower cavity are formed into bulging space portions bulging into separating areas between adjacent ones of a plurality of terminal electrodes provided around the lower cavity. By accommodating an IC chip and an electronic device in the lower cavity including the bulging space portions, the crystal oscillator can be miniaturized without affecting the size of the plurality of terminal electrodes.
Claims18
A surface-mount type crystal oscillator, comprising:
- a main body formed with a cavity in a lower portion thereof, the cavity being partitioned from a top surface of the main body by a partition wall and surrounded by cavity walls;
- a crystal oscillating element mounted on the top surface;
- a plurality of terminal electrodes on the main body disposed around the cavity walls and spaced from each other by separating areas of the cavity walls;
- extensions of the cavity protruding into the separating areas so that the terminal electrodes are separated by the extensions of the cavity;
- and
- a controlling IC chip and an electronic device accommodated in the lower cavity with the electronic device accommodated within the extensions of the cavity.
3 more elements
A surface-mount type crystal oscillator comprising:
- a main body formed with a cavity in a lower portion thereof, the cavity being partitioned from a top surface of the main body by a partition wall and surrounded by cavity walls;
- a crystal oscillating element mounted on the top surface;
- a plurality of terminal electrodes on the main body disposed around the cavity walls and spaced from each other by separating areas of the cavity walls;
- extensions of the cavity protruding into the separating areas so that the terminal electrodes are separated by the extensions of the cavity;
- a controlling IC chip and an electronic device accommodated in the lower cavity;
- and
- a thermosetting resin filling the cavity with a thickness of resin covering a lower surface of the IC chip being less than a thickness of resin between an inner surface of the IC chip and an inner laterally extending surface of the cavity, and a thickness of resin between a side surface of the IC chip and a side surface of the cavity being less than a thickness of the IC chip.
4 more elements
A surface-mount type crystal oscillator comprising:
- a main body formed with a cavity in a lower portion thereof, the cavity being partitioned from a top surface of the main body by a partition wall and surrounded by cavity walls, each cavity wall having a step adjacent to the cavity;
- a crystal oscillating element mounted on the top surface;
- a plurality of terminal electrodes on the main body disposed around the cavity walls and spaced from each other by separating areas of the cavity walls;
- extensions of the cavity protruding into the separating areas so that the terminal electrodes are separated by the extensions of the cavity;
- a controlling IC chip and an electronic device accommodated in the lower cavity;
- and
- a layer of thermosetting resin disposed within the cavity with the step serving to retain the resin within the cavity.
4 more elements
A surface-mount type crystal oscillator comprising:
- a main body formed with a cavity in a lower portion thereof, the cavity being partitioned from a top surface of the main body by a partition wall and surrounded by cavity walls;
- a crystal oscillating element mounted on the top surface;
- a plurality of terminal electrodes on the main body disposed around the cavity walls and spaced from each other by separating areas of the cavity walls;
- extensions of the cavity protruding into the separating areas so that the terminal electrodes are separated by the extensions of the cavity;
- a controlling IC chip and an electronic device accommodated in the lower cavity;
- and
- resin filling the cavity, the resin comprising:
- a first resin layer filling both a space between the cavity and a bottom surface of the IC chip and a space between the cavity and side surfaces of the IC chip;
- and
- a second resin layer covering top surfaces of the IC chip and the first resin layer.
7 more elements
A surface-mount type crystal oscillator comprising:
- a main body formed with a cavity in a lower portion thereof, the cavity being partitioned from a top surface of the main body by a partition wall and surrounded by cavity walls, each cavity wall having a step adjacent to the cavity;
- a crystal oscillating element mounted on the top surface by a mount electrode pad with a groove formed in the top surface around the mount electrode pad;
- a plurality of terminal electrodes on the main body disposed around the cavity walls and spaced from each other by separating areas of the cavity walls;
- extensions of the cavity protruding into the separating areas so that the terminal electrodes are separated by the extensions of the cavity;
- and
- a controlling IC chip and an electronic device accommodated in the lower cavity.
3 more elements
Dependencies are inferred from the claim text.