Title:
MULTI-MODE CRYSTAL OSCILLATOR
Document Type and Number:
Japanese Patent JP3203064
Kind Code:
B2
Abstract:
PURPOSE: To provide the multi-mode crystal oscillator which improves a guaranteed attenuation amount by grounding a metal lid body to a reference potential and setting an electrode gap at the peak value of the guaranteed attenuation amount and any value close to the peak value.
CONSTITUTION: Input/output electrodes 3 and 4 are formed on one main face of a crystal piece 1, and a common electrode 5 is formed on the other main face. An insulated substrate 11 forming a shield electrode 16 on the side in counter to one main face of the crystal piece 1, insulated frame body 12 provided at the outer periphery of the substrate 11 and metal lid body 10 provided on the frame body 12 are arranged. This lid body 10 is connected at the same potential as the shield electrode 16, and an electrode gap G between one main face of the crystal piece 1 and the electrode 16 for shield is set at the peak value of the guaranteed attenuation amount and the value close to the peak value. Thus, the multi-mode crystal oscillator improving the guaranteed attenuation amount can be provided.
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Inventors:
Kiyohisa Inao
Koji Mizuki
Masaki Kumagai
Takeo Seki
Koji Mizuki
Masaki Kumagai
Takeo Seki
Application Number:
JP25734492A
Publication Date:
August 27, 2001
Filing Date:
August 31, 1992
Export Citation:
Assignee:
Nippon Denpa Industry Co., Ltd.
International Classes:
H03H9/56; H03H9/02; H03H9/10; (IPC1-7): H03H9/56; H03H9/02; H03H9/10
Domestic Patent References:
| JP52141157A | ||||
| JP6365707A | ||||
| JP2261211A | ||||
| JP2119406A | ||||
| JP298207A | ||||
| JP3117934U |