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US3666896A Expired / Lapsed US ⏱️ 0.0 years remaining

Light electric tone pickup

Assignee: DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GmbH
•
Filing: 1969-11-25
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Granted: 1972-05-30
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Expires: 1989-11-25
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Abstract

Abstract In a light electric tone pick-up, a tone arm, which comprises an immovable tone arm holding member which holds the tone arm at one end pivotally about a vertical and a horizontal axis. A light beam control is disposed at the other end of the tone arm and is connected with a sensing needle for a tone modulated groove. A light source is immovably disposed adjacent to the vertical tonearm pivot axis. A first and a second light guide is secured in the tone arm, and each is directed with the cross-sectional face of one of its ends towards the light-beam control member and terminates with the cross-sectional face of the other of its ends close to the horizontal and vertical tone arm pivot axis in a radial plane, disposed spaced apart from each other, to the vertical tone arm pivot axis. Two lightelectric transmitters are immovably disposed adjacent the vertical tone-arm pivot axis and at a close distance opposite the cross-sectional faces of the light guides. A third light guide is secured in the tone arm and is directed with one of its ends towards the light-beam control member and terminates with the cross-sectional face of the other of its ends close to the horizontal and vertical tone arm pivot axis in a radial plane to the vertical tone arm swinging axis. Also, a fourth light guide is directed with one of its ends towards said light source and terminates with the other of its ends at a slight distance opposite the cross-sectional face of the fourth light guide.

Inventors

  • 👤 Eckhard Laue

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 09:38
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/008

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 270 words
In a light electric tone pick-up, a tone arm, immovable tone arm holding means holding said tone arm at one end swingably about a vertical tone-arm swinging axis and a horizontal tone-arm swinging axis, light-beam control means disposed at the other end of said tone arm, a sensing needle for a tone-modulated groove connected with said light-beam control means, a light source immovably disposed adjacent to said vertical tone-arm swinging axis, a first and a second light guide secured in said tone-arm, each of said first and second light guides being directed with the cross-sectional face of one of its ends towards said lightbeam control means and terminating with the cross-sectional face of the other of its ends close to said horizontal and vertical tone arm swinging axes and in a plane disposed parallel to said vertical tone arm swinging axis and said cross-sectional faces of said one ends being spaced from each other, two light electric elements immovably disposed adjacent said vertical tone-arm swinging axis and at a close distance opposite said cross-sectional faces of said light guides, a third light guide secured in said tone arm and directed with one of its ends towards said light-beam control means and terminating with the cross-sectional face of the other of its ends close to said horizontal and vertical tone arm swinging axes and in a plane parallel to said vertical tone arm swinging axis, and a fourth light guide directed with one of its ends towards said light source and terminating with the other of its ends at a slight distance opposite said cross-sectional face of said third light guide.
Claim 2
Dependent Claim 270 words
In a light electric tone pick-up, a tone arm, immovable tone arm holding means holding said tone arm at one end swingably about a vertical tone-arm swinging axis and a horizontal tone-arm swinging axis, light-beam control means disposed at the other end of said tone arm, a sensing needle for a tone-modulated groove connected with said light-beam control means, a light source immovably disposed adjacent to said vertical tone-arm swinging axis, a first and a second light guide secured in said tone-arm, each of said first and second light guides being directed with the cross-sectional face of one of its ends towards said lightbeam control means and terminating with the cross-sectional face of the other of its ends close to said horizontal and vertical tone arm swinging axes and in a plane disposed parallel to said vertical tone arm swinging axis and said cross-sectional faces of said one ends being spaced from each other, two light electric elements immovably disposed adjacent said vertical tone-arm swinging axis and at a close distance opposite said cross-sectional faces of said light guides, a third light guide secured in said tone arm and directed with one of its ends towards said light-beam control means and terminating with the cross-sectional face of the other of its ends close to said horizontal and vertical tone arm swinging axes and in a plane parallel to said vertical tone arm swinging axis, and a fourth light guide directed with one of its ends towards said light source and terminating with the other of its ends at a slight distance opposite said cross-sectional face of said third light guide.
Claim 3
Dependent Claim 50 words
The light-electric tone arm pick-up, as set forth in claim 1, wherein said ends of said light guides secured to said tone arm, on the side of said tone arm holding means are connected each with a prism, which deviates by total reflection the light beam at a right angle
Claim 4
Dependent Claim 42 words
The device, as set forth in claim 1, wherein at least two of said cross-sectional faces of said one ends of said light guides in said tone arm are spaced from said vertical tone arm swinging axis by different radial distances, respectively.

References Cited (Backward Citations)

US3534181A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-30 1975-11-29 1976-05-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-30 1979-11-29 1980-05-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-30 1983-11-29 1984-05-30 $7700.00 Window Closed / Lapsed

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