Crystal oscillator and temperature-keeping method thereof

• US 20060081605A1
• Filed: 09/19/2005
• Published: 04/20/2006
• Est. Priority Date: 09/21/2004
• Status: Abandoned Application

• Current Assignee: Nihon Dempa Kogyo Company Limited
• Original Assignee: Nihon Dempa Kogyo Company Limited
• Inventors: Fukuda, Minoru, Sakaba, Yasuo, Oita, Takeo, Sakamoto, Katsuaki
• Application Number:
  US11/229,996
• Publication Number:
  US 20060081605A1
• Time in Patent Office: Days
• US Class Current: 219/494
• CPC Class Codes: G05D 23/1913 delivering a series of pulses
• CPC Class Codes: H03L 1/022 by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature H03L1/021 takes precedence
• CPC Class Codes: H03L 1/028 of generators comprising piezoelectric resonators H03L1/021, H03L1/022 take precedence; oscillation generators with a piezoelectric resonator H03B5/32
• CPC Class Codes: H03L 1/04 Constructional details for maintaining temperature constant

Abstract

This is a crystal oscillator comprising a heater whose heater line is multiplied and a control unit for controlling the heater.

Claims

1. A crystal oscillator, comprising:

a heater whose heater line is multiplied; and

a control unit for controlling the heater.

2. The crystal oscillator according to claim 1, wherein

said heater has the duplicate heater lines, and

said control unit flows two driving currents each with an opposite phase through the pair of two heater lines.

3. The crystal oscillator according to claim 1, wherein

said heater is disposed in such a way as to envelop an object, whose temperature is kept constant by the heater by the heater lines.

4. The crystal oscillator according to claim 2, wherein

said heater is disposed in such a way as to envelop an object, whose temperature is kept constant by the heater by the heater lines.

5. The crystal oscillator according to claim 1, wherein

said control unit controls said heater by controlling pulse width modulation.

6. A crystal oscillator, comprising:

a heater whose heater line is multiplied; and

control means for controlling the heater.

7. A method for heating an object whose temperature is kept constant to keep its temperature constant in a crystal oscillator, comprising:

disposing the object whose temperature is kept constant to be enveloped in duplicated heater lines; and

heating the object whose temperature is kept constant to keep its temperature constant by flowing driving currents each with an opposite phase through a pair of duplicated heater lines.