Tape-detecting device for tape recorders

Claim 2

A tape-detecting device comprising a discontinuous conductive member, a conductive member making contact therewith, both said members mounted for rotation on opposite sides of the tape in accordance with the travel of a tape and a power source for applying a voltage between the discontinuous conductive member and the conductive member, in which an electric signal is derived from between the discontinuous conductive member and the conductive member when they are both rotating in accordance with the travel of a tape.

Claim 3

A tape-detecting device as claimed in claim 1 wherein the discontinuous conductive member is formed on one end face of a rotary member rotating in relation to the travel of a tape and the conductive member making contact with the discontinuous conductive member is a brush.

Claim 4

A tape-detecting device as claimed in claim 1 wherein the discontinuous conductive member is formed on the peripheral surface of a rotary member rotating in relation to the travel of a tape.

Claim 5

A tape-detecting device as claimed in claim 1 wherein the discontinuous conductive member is formed on one end face of a pinch roller.

Claim 6

A tape-detecting device as claimed in claim 1 wherein the discontinuous conductive member is formed on the peripheral surface of a pinch roller.

Claim 7

A tape-detecting device comprising a pinch roller consisting of an outer cylindrical member formed of an elastic material and an inner cylindrical member formed of a conductive material, in which a conductive piece is provided in a manner to make intermittent contact with one end face of the inner cylindrical member and a voltage impressed between the inner cylindrical member formed of the conductive material and the conductive piece making intermittent contact therewith, thereby to derive from therebetween an electric signal corresponding to their intermittent contact.

Claim 8

A tape-detecting device comprising a pinch roller consisting of an outer cylindrical member formed of an elastic material and an inner cylindrical member formed of a conductive material, in which a conductive piece is provided in a manner to make intermittent contact with one end face of the inner cylindrical member and a voltage impressed between the inner cylindrical member formed of the conductive material and the conductive piece making intermittent contact therewith, thereby to derive from therebetween an electric signal corresponding to their intermittent contact.

Claim 9

A tape-detecting device as claimed in claim 1 which includes a tape contact portion formed of a conductive material and provided on the outer peripheral surface of the discontinuous conductive member and a conductive contact portion placed opposite to the tape contact portion.

Claim 10

A tape-detecting device as claimed in claim 7 wherein the tape contact portion is made up of an area formed of a conductive material and a pair of areas formed of an insulating material on both side of the conductive area and the conductive area is narrower than a tape.

Claim 11

A tape-detecting device as claimed in claim 8 wherein ring-shaped grooves are formed along the boundaries between the conductive area and the areas formed of the insulating material.

Claim 12

A tape-detecting device as claimed in claim 7 wherein the tape contact portion is made up of an area formed of a conductive material and an area formed of an insulating material and an insulating material is provided on the conductive tape contact area of the tape contact portion placed opposite to the tape contact member.

Claim 13

A tape-detecting device as claimed in claim 7 wherein the tape contact portion is wider than a tape, two insulating members are provided on the conductive tape contact portion placed opposite to the tape contact portion and the distance between the two insulating members is smaller than the width of the tape.

Claim 14

A tape-detecting device as claimed in claim 1 wherein the discontinuous conductive member is formed on the peripheral surface of a rotary member rotating in relation with the tape travel and the continuous conductive member is formed to partially exposed at the peripheral surFace of the rotary member.

Claim 15

A tape-detecting device comprising a discontinuous conductive member mounted on a conductive shaft, a resilient member placed on the outer peripheral surface of the discontinuous conductive member, a conductive member disposed to make contact with the discontinuous conductive member, means for supporting the conductive shaft, the supporting means further supporting the conductive member, means for impressing a voltage between the conductive member and the conductive shaft, and means for deriving from therebetween an electric signal in accordance with the relative rotation between the discontinuous conductive member and the conductive member.

Claim 16

A tape-detecting device comprising a discontinuous conductive member mounted on a conductive shaft, a resilient member placed on the outer peripheral surface of the discontinuous conductive member, a conductive member disposed to make contact with the discontinuous conductive member, means for supporting the conductive shaft, the supporting means further supporting the conductive member, means for impressing a voltage between the conductive member and the conductive shaft, and means for deriving from therebetween an electric signal in accordance with the relative rotation between the discontinuous conductive member and the conductive member.