Constant temperature type crystal oscillator
A technology of crystal oscillators and crystal resonators, applied in power oscillators, instruments, temperature control, etc., can solve problems such as failure to meet predetermined standards, and achieve the effect of solving temperature dependence and stable characteristics
Inactive Publication Date: 2009-12-30
NIHON DEMPA KOGYO CO LTD
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However, the frequency stability is about 1ppm in this case, so there is a problem that it cannot meet the predetermined standard
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[0043] Lead-Out Crystal Oscillators
[0044] FIG. 1 is a diagram for explaining an embodiment of a lead-out type highly stable oscillator of the present invention, wherein Figure 1A is its partial longitudinal sectional view, and Figure 1B is the plan view of the principal points.
[0045] The highly stable oscillator of the present invention includes an oven-controlled crystal oscillator in which the operating temperature of the crystal oscillator is constant. Here, if Figure 1A As shown, this highly stable oscillator is composed of an oscillating element 8 including a crystal resonator 7 (a crystal plate 7a) and a temperature control element 5 mounted on a single circuit board 1, and a heating body 11 connected to the circuit board 1 . The heating body 11 includes a heat conducting plate 12 and chip resistors 13a and 13b for heating. Here too, the power transistors of the temperature control element 5 are used for heating.
[0046] The heat conduction plate 12 inclu...
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The present invention is one where, in a lead wire led-out type crystal oscillator of constant temperature type for high stability, comprising: a heat supply body that supplies heat to a crystal resonator from which a plurality of lead wires are led out, to maintain the temperature constant; an oscillating element that constitutes an oscillating circuit together with the crystal resonator; a temperature control element that constitutes a temperature control circuit for controlling the temperature of the crystal resonator; and a circuit board for mounting the heat supply body, the oscillating element, and the temperature control element, and through which lead wires of the crystal resonator are passed through for mounting, the heat supply body comprises: a heat conducting plate which has through-holes for the lead wires and is mounted on the circuit board, and which faces, and is directly thermally joined to, the crystal resonator; and a chip resistor for heating which is mounted on the circuit board adjacent to the heat conducting plate, and is thermally joined to the heat conducting plate.
Description
technical field [0001] The present invention relates to a highly stable crystal oscillator of a lead-out type and a constant temperature type (hereinafter referred to as a high-stable oscillator), and more particularly, to a highly-stable oscillator that is effective in heat utilization. Background technique [0002] This type of high stability oscillator has high frequency stability because the operating temperature of the crystal oscillator is kept constant by a thermostat. Therefore, for example, highly stable oscillators of this type have been industrially used in optical communication base stations. Recently, miniaturization has spread even to these highly stable oscillators, and corresponding miniaturization has been demanded. [0003] 2A and 2B are block diagrams illustrating a conventional example of this type of lead-out type crystal oscillator. FIG. 2A is a longitudinal sectional view of a highly stable oscillator, and FIG. 2B is a perspective view of a lead-out ...
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IPC IPC(8): H03B5/04H03B5/32G05D23/24
Inventor 伊藤学福田稔工藤铁男内田刚史
Owner NIHON DEMPA KOGYO CO LTD