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Crystal unit

A crystal oscillator and crystal chip technology, applied in electrical components, impedance networks, etc., can solve the problems of uneven aging characteristics, uneven environmental resistance characteristics, and large frequency changes, so as to maintain aging characteristics, improve aging characteristics, and reduce resistance. Uneven effects of environmental characteristics

Inactive Publication Date: 2014-04-09
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0033] However, in conventional IT-cut crystal resonators, there are problems of large frequency changes after power-on and uneven aging characteristics.
[0034] Furthermore, in conventional IT-cut crystal resonators, there is a problem that the environmental resistance characteristics are not uniform due to the rotational displacement of the crystal plate.

Method used

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Experimental program
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Embodiment Construction

[0073] Embodiments of the present invention will be described with reference to the drawings.

[0074] [summary of embodiment]

[0075] The crystal vibrator according to the embodiment of the present invention uses an IT-cut circular crystal plate, and is configured such that the crystal plate is supported at two points on the outer periphery, and the self-warp of a straight line connecting the two points is The in-plane rotation angle ψ from the Z" axis of the second rotation is set to -12°~+4°, +60°~+80°, so that the frequency change after the power is turned on can be suppressed, and the aging characteristics can be improved.

[0076] In addition, in the crystal vibrator according to the embodiment of the present invention, in the crystal vibrator, the crystal plate includes L-shaped notches on the lower sides of the two edge portions supported by the support body, and the support body includes the engaging The shape of the slit in the notch of the crystal plate can keep t...

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Abstract

A crystal unit according to this disclosure includes an IT-cut round crystal element (1) supported at two points on an outer periphery portion of the IT-cut round crystal element. A straight line connecting these two points has a rotation angle in plane of -12 degrees to +4 degrees or +60 degrees to +80 degrees from Z'' axis of a double-rotation. Notched portions are included at the support position of the crystal element and are clamped to the a slit formed on the support to support the crystal element.

Description

technical field [0001] The present invention relates to a crystal vibrator using an IT-cut crystal plate, in particular to a crystal vibrator capable of improving aging characteristics and reducing uneven environmental resistance characteristics. Background technique [0002] [Description of Prior Art] [0003] Crystal oscillators using IT-cut crystal wafers are used in oven-type crystal oscillators (OCXO: Oven Controlled Crystal Oscillator (Oven Controlled Crystal Oscillator)) and the like. [0004] The IT-cut crystal vibrator is formed by forming electrodes on a twice-rotated crystal plate, which is cut from the following plane, which is the plane perpendicular to the Y-axis of the crystal A surface formed by rotating approximately 34° counterclockwise around the X-axis, and then rotating approximately 19° around the Z-axis from the rotated position. [0005] [in-plane rotation angle] [0006] The Z axis generated by two rotations, which are respectively rotated counter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/02H03H9/19
CPCH03H9/02149H03H9/1028H03H9/02015
Inventor 楠豊彰
Owner NIHON DEMPA KOGYO CO LTD
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