Stacked piezoelectric transducer acting as quarter-wave resonator for recording video information专利检索-压电谐振器电子零件及设备专利检索查询-专利查询网

Stacked piezoelectric transducer acting as quarter-wave resonator for recording video information

阅读：615发布：2023-04-01

专利汇可以提供Stacked piezoelectric transducer acting as quarter-wave resonator for recording video information专利检索，专利查询，专利分析的服务。并且A recording head for applying a video program to a record disc employs a transducer having a plurality of planar piezoelectric elements united in a stack arrangement which collectively exhibits a predetermined acoustic impedance. A base member, bonded to one terminus of the stack, has a specific impedance at least an order of magnitude greater than the stack impedance so that the stack operates substantially as a quarter-wave resonator. An energizing signal applied to the stack develops longitudinal mode vibratory displacements of the stack proportional to the excursions of the energizing signal. A coupler, bonded to a second terminus of the stack, translates the vibratory displacements to a stylus which generates a pattern on an impressionable surface of the record disc.，下面是Stacked piezoelectric transducer acting as quarter-wave resonator for recording video information专利的具体信息内容。

权利要求

1. A recording head for applying a pattern to a record medium having an impressionable surface, said head comprising: a transducer comprising a plurality of polarized substantially planar piezoelectric elements each having a first electrode associated with one pole of said element and a second electrode associated with the opposite pole of said element, said elements united in a stack arrangement with adjacently positioned ones of said elements having oppositely directed polarizations and collectively exhibiting a predetermined acoustic impedance; a base member bonded to a first terminus of said stack and having a specific acoustic impedance at least an order of magnitude greater than said stack impedance so as to establish said stack substantially as a quarter-wave resonator; circuit means, including means for establishing a first conductive connection common to said first electrodes and for establishing a second conductive connection common to said second electrodes, for applying an electrical signal across said elements to develop longitudinal mode vibratory displacements of said stacked elements proportional to the excursions of said signal; a coupler bonded to a second terminus of said stack for translating said stack displacements; and a stylus supported by said coupler for presentation to the impressionable record medium surface and responsive to the stack displacements translated by said coupler for generating a pattern on said surface corresponding to said displacements.

2. A recording head as set forth in claim 1 in which said transducer elements individually increase in size, progressively, from an elemental cross-sectional area to a predetermined enlarged cross-sectional area.

3. A recording head as set forth in claim 2 in which each of said transducer elements comprises a substantially circular wafer of piezoelectric material.

4. A recording head as set forth in claim 2 in which said base member is bonded to one surface of that transducer element having said predetermined enlarged cross-sectional area.

5. A recording head as set forth in claim 2 in which said coupler is bonded to one surface of that transducer element of elemental cross-sectional area.

6. A recording head as set forth in claim 1 in which, effectively, one-half of said elements are polarized in a predetermined sense and the other half are polarized in an opposite sense.

7. A recording head as set forth in claim 1 in which the end elements of said stack have a thickness substantially one-half that of the other elements.

8. A transducer head as set forth in claim 7 in which said end elements are oppositely polarized.

9. A transducer head as set forth in claim 7 in which said end elements are similarly polarized.

10. A recording head as set forth in claim 1 which further includes means for heating said stylus.

11. A recording head as set forth in claim 1 in which said base member comprises a tungsten rod.

12. A recording head as set forth in claim 1 in which said coupler comprises a wafer of alumina.

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Stacked piezoelectric transducer acting as quarter-wave resonator for recording video information

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