Dielectric filter

- NGK Spark Plug Co., Ltd.
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Description

FIG. 1 is a top plan view of a first embodiment of the piezoelectric filter of the present invention;

FIG. 2 is a front elevation view of the piezoelectric filter depicted in FIG. 1;

FIG. 3 is a right side elevation view of the piezoelectric filter depicted in FIG. 1;

FIG. 4 is a left side elevation view of the piezoelectric filter depicted in FIG. 1;

FIG. 5 is a bottom plan view of the piezoelectric filter depicted in FIG. 1;

FIG. 6 is a rear view of the piezoelectric filter depicted in FIG. 1;

FIG. 7 is a cross-sectional view of the piezoelectric filter depicted in FIG. 1 taken along the line 7--7 in FIG. 1;

FIG. 8 is a cross-sectional view of the piezoelectric filter depicted in FIG. 2 taken along the line 8--8 in FIG. 2;

FIG. 9 is a perspective view showing the upper and front side surfaces of the piezoelectric filter depicted in FIG. 1;

FIG. 10 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 1;

FIG. 11 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a second embodiment of the present invention;

FIG. 12 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 11;

FIG. 13 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a third embodiment of the present invention;

FIG. 14 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 13;

FIG. 15 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a fourth embodiment of the present invention;

FIG. 16 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 15;

FIG. 17 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a fifth embodiment of the present invention;

FIG. 18 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 17;

FIG. 19 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a sixth embodiment of the present invention;

FIG. 20 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 19;

FIG. 21 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a seventh embodiment of the present invention;

FIG. 22 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 21;

FIG. 23 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of an eighth embodiment of the present invention;

FIG. 24 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 23;

FIG. 25 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a ninth embodiment of the present invention;

FIG. 26 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 25;

FIG. 27 is a top plan view of a tenth embodiment of the piezoelectric filter of the present invention;

FIG. 28 is a front elevation view of the piezoelectric filter depicted in FIG. 27;

FIG. 29 is a side elevation view of the piezoelectric filter depicted in FIG. 27;

FIG. 30 is a bottom plan view of the piezoelectric filter depicted in FIG. 27;

FIG. 31 is a rear view of the piezoelectric filter depicted in FIG. 27;

FIG. 32 is a cross-sectional view of the piezoelectric filter depicted in FIG. 27 taken along the line 32--32 in FIG. 27;

FIG. 33 is a perspective view showing the upper and front surfaces of the piezoelectric filter depicted in FIG. 27;

FIG. 34 is a perspective view showing of an eleventh embodiment of the piezoelectric filter of the present invention, the bottom, rear and left side being the same as the tenth embodiment except for the central channel on the bottom surface; and,

FIG. 35 is a perspective view showing of a twelfth embodiment of the piezoelectric filter of the present invention, the bottom, rear and left side being the same as the tenth embodiment.

Referenced Cited
U.S. Patent Documents
4431977 February 14, 1984 Sokola et al.
4703291 October 27, 1987 Nishikawa et al.
4733208 March 22, 1988 Ishikawa et al.
4795992 January 3, 1989 Saito et al.
4806889 February 21, 1989 Nakano et al.
4890079 December 26, 1989 Sasaki
4965537 October 23, 1990 Kommrusch
5208566 May 4, 1993 Kenoun et al.
Foreign Patent Documents
563987 October 1993 EPX
405152803 June 1993 JPX
Patent History
Patent number: D359024
Type: Grant
Filed: Dec 2, 1993
Date of Patent: Jun 6, 1995
Assignee: NGK Spark Plug Co., Ltd. (Aichi)
Inventor: Kenji Ito (Nagoya)
Primary Examiner: Joel Sincavage
Law Firm: Larson and Taylor
Application Number: 0/15,945