EP0169053A2 — High frequency filter for electric instruments

Claim 1

Independent Claim 151 words

A high frequency filter for an electric instrument including a casing of metallic conductive material, an internal electric circuit element arranged within said casing, and a connector mounted on a peripheral wall of said casing for connecting said internal electric circuit element to an external electric circuit, the high frequency filter comprising: an insulation substance layer arranged between said connectcr and a connection terminal of said circuit element, said insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto; and a pair of conductive layers formed on opposite surfaces of said insulation substance layer, one of said conductive layers being connected at one end thereof to said connector and at the other end thereof to the connection terminal of said circuit element, and the other conductive layer being connected to a portion of said casing.

Claim 2

Dependent Claim 151 words

A high frequency filter for an electric instrument including a casing of metallic conductive material, an internal electric circuit element arranged within said casing, and a connector mounted on a peripheral wall of said casing for connecting said internal electric circuit element to an external electric circuit, the high frequency filter comprising: an insulation substance layer arranged between said connectcr and a connection terminal of said circuit element, said insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto; and a pair of conductive layers formed on opposite surfaces of said insulation substance layer, one of said conductive layers being connected at one end thereof to said connector and at the other end thereof to the connection terminal of said circuit element, and the other conductive layer being connected to a portion of said casing.

Claim 3

Dependent Claim 23 words

A high frequency filter as claimed in Claim 1, wherein said insulation substance layer is made of a compound of ferro-niobate and ferrotungsten.

Claim 4

Dependent Claim 161 words

A high frequency filter for an electric instrument including a casing of metallic conductive material, an internal electric circuit element arranged within said casing, and a connector mounted on a peripheral wall of said casing for connecting said internal electric circuit element to an external electric circuit, the high frequency filter comprising: an insulation substance layer arranged between said connector and a connection terminal of said circuit element, said insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto; a first conductive layer made of an impedance material secured to one surface of said insulation substance layer and being connected at one end thereof to said connector and at the other end thereof to the connection terminal of said circuit element; and a second conductive layer formed on the other surface of said insulation substance layer and being connected to a portion of said casing.

Claim 5

Dependent Claim 161 words

A high frequency filter for an electric instrument including a casing of metallic conductive material, an internal electric circuit element arranged within said casing, and a connector mounted on a peripheral wall of said casing for connecting said internal electric circuit element to an external electric circuit, the high frequency filter comprising: an insulation substance layer arranged between said connector and a connection terminal of said circuit element, said insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto; a first conductive layer made of an impedance material secured to one surface of said insulation substance layer and being connected at one end thereof to said connector and at the other end thereof to the connection terminal of said circuit element; and a second conductive layer formed on the other surface of said insulation substance layer and being connected to a portion of said casing.

Claim 6

Dependent Claim 30 words

A high frequency filter as claimed in Claim 3, wherein said first conductive layer is made of a resistance material such as conductive paint including carbon as a main component.

Claim 7

Dependent Claim 186 words

A high frequency filter for an electric instrument including a casing for metallic conductive material, an internal electric circuit element arranged within said casing, and a connector mounted a peripheral wall of said casing for connecting said internal electric circuit element to an external electric circuit, the high frequency filter comprising: an insulation substance layer arranged between said connector and a connection terminal of said circuit element, said insulation substance layer including a first section made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto and further including a second section made of a magnetic material whose permeability decreases or increases in accordance with increase or decrease of wireless freqeuency applied thereto; and a pair of conductive layers formed on opposite surfaces of the first and second sections of said insulation substance layer, one of said conductive layers being connected at one end thereof to said connector and at the other end thereof to the connection terminal of said circuit element, and the other conductive layer being connected to a portion of said casing.

Claim 8

Dependent Claim 186 words

A high frequency filter for an electric instrument including a casing for metallic conductive material, an internal electric circuit element arranged within said casing, and a connector mounted a peripheral wall of said casing for connecting said internal electric circuit element to an external electric circuit, the high frequency filter comprising: an insulation substance layer arranged between said connector and a connection terminal of said circuit element, said insulation substance layer including a first section made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto and further including a second section made of a magnetic material whose permeability decreases or increases in accordance with increase or decrease of wireless freqeuency applied thereto; and a pair of conductive layers formed on opposite surfaces of the first and second sections of said insulation substance layer, one of said conductive layers being connected at one end thereof to said connector and at the other end thereof to the connection terminal of said circuit element, and the other conductive layer being connected to a portion of said casing.

Claim 9

Dependent Claim 44 words

A high frequency filter as claimed in Claim 5, wherein said insulation substance layer includes at least first and second sections respectively made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto.

Claim 10

Dependent Claim 43 words

A high frequency filter as claimed in Claim 5, wherein said insulation substance layer includes at least first and second sections respectively made of a magnetic material whose permeability decreases or increases in accordance with increase or decrease of wireless frequency applied thereto.

Claim 11

Dependent Claim 32 words

A high frequency filter as claimed in Claim 5, wherein said insulation substance layer includes at least first and second sections respectively made of different kinds of dielectric material or magnetic material.

Claim 12

Dependent Claim 175 words

A high frequency filter for an electric instrument including a casing of metallic conductive material, a circuit board of insulation material arranged in place within said casing, an internal electric circuit mounted on said circuit board, a connector mounted on a peripheral wall of said casing for connecting a plurality of terminals of said internal electric circuit element to a plurality of leading wires extending from an external electric circuit, the high frequency filter comprising: a common electrode plate mounted on said circuit board between said connector and the terminals of said circuit element and being connected to a portion of said casing; an insulation substance layer formed on said common electrode plate, said insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto; and a plurality of parallel electrode strips mounted on said insulation substance layer and being connected at their one ends to said connector and at their other ends to the terminals of said circuit element.

Claim 13

Dependent Claim 175 words

A high frequency filter for an electric instrument including a casing of metallic conductive material, a circuit board of insulation material arranged in place within said casing, an internal electric circuit mounted on said circuit board, a connector mounted on a peripheral wall of said casing for connecting a plurality of terminals of said internal electric circuit element to a plurality of leading wires extending from an external electric circuit, the high frequency filter comprising: a common electrode plate mounted on said circuit board between said connector and the terminals of said circuit element and being connected to a portion of said casing; an insulation substance layer formed on said common electrode plate, said insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto; and a plurality of parallel electrode strips mounted on said insulation substance layer and being connected at their one ends to said connector and at their other ends to the terminals of said circuit element.

Claim 14

Dependent Claim 22 words

A high frequency filter as claimed in Claim 9, wherein said common electrode plate is arranged in parallel with said circuit board.

Claim 15

Dependent Claim 74 words

A high frequency filter as claimed in Claim 9, wherein said common electrode plate is arranged perpendicular to said circuit board, and wherein said electrode strips are in the form of a plurality of U-shaped electrode strips each having a first arm portion secured to said insulation substance layer for connection to said connector and a second arm portion spaced from said common electrode plate for connection to the terminals of said circuit element.

Claim 16

Dependent Claim 65 words

A high frequency filter as claimed in Claim 9, wherein said common electrode plate is arranged perpendicular to said circuit board, and wherein said electrode strips are in the form of a plurality of U-shaped electrode strips formed on said insulation substance layer and being connected at their one ends to said connector and at their other ends to the terminals of said circuit element.

Claim 17

Dependent Claim 77 words

A high frequency filter as claimed in Claim 1, wherein said insulation substance layer is made of ferroelectric substance having dielectric constant-radio frequency property in which a dielectric constant at a radio frequency 1 MHz is larger than or equal to 8000 and in which a relaxation frequency is larger than or equal to 100 MHz, the relaxation frequency being defined by an arithmetic mean value between dielectric constants respectively at frequencies of 1MHz and 1000 MHz.

Claim 18

Dependent Claim 20 words

A high frequency filter as claimed in Claim 13, wherein said ferroelectric substance has lead composite stracture in perobuskite type.

Claim 19

Dependent Claim 18 words

A high frequency filter as claimed in Claim 13, wherein said ferroelectric substance is ceramics of Pb(Mgl/3Nb2/3)03 system.

Claim 20

Dependent Claim 27 words

A high frequency filter as claimed in Claim 13, wherein said ferroelectric substance is ceramics of Pb(Fe 1 / 2 Nb 1 / 2 )O 3 system.

Claim 21

Dependent Claim 33 words

A High frequency filter as claimed in Claim 13, wherein said ferroelectric substance is ceramics mainly including Pb(Fe 1/2 Nb 1/2 )X (Fe 2/3 W 1/3 ) 1-x O 3 type (0.5≦X≦ 0.8).

Claim 22

Dependent Claim 52 words

A high frequency filter as claimed in Claim 13, wherein said ferroelectric substance includes mainly Pb(Fe 1/2 Nb 1/2 ) X (Fe 2/3 W 1/3 ) 1-x O 3 type (0.5 ≦X≦ 0.8) and subsidiarily at least one of transition element oxide, zinc oxide and tin oxide in 0.1 to lwt .

High frequency filter for electric instruments

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