US3666896A - Light electric tone pickup - Google Patents

Light electric tone pickup Download PDF

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Publication number
US3666896A
US3666896A US879693A US3666896DA US3666896A US 3666896 A US3666896 A US 3666896A US 879693 A US879693 A US 879693A US 3666896D A US3666896D A US 3666896DA US 3666896 A US3666896 A US 3666896A
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US
United States
Prior art keywords
light
tone
tone arm
vertical
arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US879693A
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English (en)
Inventor
Eckhard Laue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GmbH
Original Assignee
Dual Gebruder Steidinger GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dual Gebruder Steidinger GmbH and Co filed Critical Dual Gebruder Steidinger GmbH and Co
Application granted granted Critical
Publication of US3666896A publication Critical patent/US3666896A/en
Assigned to DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH reassignment DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DUAL GEBRUDER STEIDINGER GMBH U. CO. 1.K,
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound

Definitions

  • 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 tone-arm 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 crosssectional 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.
  • 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.
  • the present invention relates to a light electric tone pickup, which includes a sensing needle, which is connected with a screen or mirror for the modulation of a light stream and which swings by guidance in the tone groove of a sound disc the tone arm about an axis, whereby the light source and the light-sensitive cell is immovably disposed and the light stream required for the operation is guided by means of light guides disposed in the tone arm from the light source to the modulation point in the tone arm head and to return with the intermediate arrangement of an air gap within the range of the swinging axis of the tone arm.
  • the arrangement of the light guides requires a comparatively large effective surface of the photo-electric cells.
  • the stereophonic tonepick-up comprises only one light guide, which terminates at the end of the tone-arm swinging axis into three ends, of which one end leads to the light source and the two others to a light sensitive cell with the intermediate arrangement of one of two different light filters and the end of which on the tone-arm side terminates likewise into three ends, whereby the light stream of the one end is guided to the two control edges and with an intermediate arrangement of one of two difierent light filters, corresponding with the previously mentioned leads to one of the two remaining ends.
  • Such arrangement is characterized by a particularly small space requirement in the tone arm.
  • the light stream to be controlled is partly covered by a screen in the known tone-pick-up systems, which screen is connected with a sensing needle.
  • the edge length times the amplitude performed perpendicularly to the edge results in the cross-sectional face of the changed light stream.
  • This face is relatively small, because, on the one hand, limits are set constructively to the enlargement of the screen, first of all due to the inertia mass and, on the other hand, for the same reasons limits are also set to the amplitude size. Also the distance of the light source to the screen can be varied within certain limits.
  • the material remaining between the limit edges corresponds as to its width to about the half distance of the limit edges.
  • FIG. 1 is a side elevation of a tone arm bearing in section;
  • FIG. 2 is a fragmentary section along the lines 2-2 of FIG.
  • FIG. 3 is a fragmentary view of the structure shown in FIG. 1, and
  • FIGS. 4 and 5 are schematic views of the most important parts of two different light electric stereo tone-pick-ups.
  • a bearing carrier 2 In the latter is mounted rotatably in points 5 and 6 about a vertical axis 3 (tone-arm-swinging-axis), a tone-arm-carrier 4.
  • the tone arm 7 is rotatably mounted with point bearings 8 and 9 about a horizontal axis 10 in the tone-arm-carrier 4.
  • an incandescent bulb 11 In the bearing carrier 2 an incandescent bulb 11 is secured.
  • a light guide 12 is secured to the tone-arm-carrier 4, swinging with the tone arm 7, which light guide 12 leads to the direct vicinity of the horizontal swinging axis 10 of the tone arm 7, and with the intermediate arrangement of an air gap 13 is continued in the tone arm 7 by means of a prism 14.
  • the light guide 12 rotates at its lower end merely about its longitudinal axis and remains thereby in its position relative to the light bulb 11. Within the range of air gap 13, no change takes place.
  • the light which is modulated in form of a channel (not shown) in the tone arm head is fed by means of the two light guides 16 and 17, to the prisms l8 and 19 of synthetic material attached thereto and the air gap 20 and 21 to the light sensitive cells 22 and 23.
  • the latter are immovably arranged by means of a holding arm 24 on the bearing carrier 2. Due to the concentric position of the prisms 18 and 19 to the swinging axis 3 of the tone arm 7, the prisms do not change their position relative to the photo electric cells 22 and 23, if their tone arm is turned horizontally.
  • a light bulb is provided in the base plate 30 as a light source 31 and as a light sensitive cell 32 and 33, two photodiodes are provided. Opposite to the latter terminates a likewise immovably disposed three armed light guide 34, which is disposed with its main part in the vertical tone arm swinging axis 35.
  • a prism 38 disposed tightly thereover and connected with the light guide 37 disposed in the tone arm 36 the light beam is fed to the tone arm head 39.
  • One end 40 of the likewise three armed terminating light guide 37 leads the light stream back over a prism 41 and 42 to the two other ends 43 and 44.
  • the oppositely disposed ends of the light guide are arranged in pairs and are equipped with a red 43, 49 and a green filter 44, 48, respectively.
  • a variation for instance of the light beam impinging by example upon a filter 43 in the rhytm of the movements of the sensing needle 47 causes a variation of the light falling backwardly in the light guide 34 and 37 and in particular only the one which corresponds with the red color filter 43.
  • This variation can urge towards the outside of the light guide only there, where the particular light color is passed, that means, on the red filter 49, not, however, on the green filter 48.
  • the back stream of the light towards the light source 31 is thereby without any significance.
  • a light source 50 is disposed in the tone arm head, the light stream of which is directed towards two light sensitive cells 51 and 52.
  • a light screen 55 which covers partly the light sensitive cells 51 and 52 against the light beam.
  • the screen Parallel to the control edges 56 and 57 disposed in the two modulation directions A and B, the screen contains a slot 58 and 59.
  • the light sensitive cell 51 and 52 carries a light nontransparent strip 60 and 61. It is arranged to the corresponding slot 58 and 59 of the screen 55 such, that it covers by the shadow image 55 of the screen 55 on the light sensitive cell 51 and 52 the slot edge 64' disposed close to the control edge 56 and 57.
  • the sensing needle 54 and the screen 55, respectively, is moved upwardly in the modulation direction A," the lit face of the light sensitive cell 52 likewise not covered by the shade image 55' of the screen 55 is reduced.
  • the face lit through the slot 59 of the screen 55 is likewise reduced, because the lower slot edge 62 and 62', respectively, approaches the lower edge 63 of the light non-transparent strip 61.
  • the change amount namely the edge length 57, 62, times amplitude, occurs twice corresponding with the number of the edges 57 and 62, which causes in this case a doubling of the current variation. It is to be understood, that a further multiplication with, the addition of further slots 50 and covering strips 60 and 6], respectively, is possible.
  • 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
  • a sensing needle for a tone-modulated groove connected with said light-beam control means
  • each of said first and second light guides being directed with the cross-sectional face of one of its ends towards said light-beam control means and terminating with the crosssectional 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,
  • 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.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Couplings Of Light Guides (AREA)
US879693A 1968-11-26 1969-11-25 Light electric tone pickup Expired - Lifetime US3666896A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681810984 DE1810984A1 (de) 1968-11-26 1968-11-26 Lichtelektrischer Tonabnehmer

Publications (1)

Publication Number Publication Date
US3666896A true US3666896A (en) 1972-05-30

Family

ID=5714368

Family Applications (1)

Application Number Title Priority Date Filing Date
US879693A Expired - Lifetime US3666896A (en) 1968-11-26 1969-11-25 Light electric tone pickup

Country Status (5)

Country Link
US (1) US3666896A (enrdf_load_stackoverflow)
JP (1) JPS5029321B1 (enrdf_load_stackoverflow)
DE (1) DE1810984A1 (enrdf_load_stackoverflow)
FR (1) FR2024265A6 (enrdf_load_stackoverflow)
GB (1) GB1285611A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860766A (en) * 1972-05-31 1975-01-14 Tokyo Shibaura Electric Co Optical signal reproducing apparatus
US4710912A (en) * 1986-06-02 1987-12-01 Greene Hugh W Air cushion-optical data read head

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4463871A (en) * 1983-08-03 1984-08-07 Public Service Electric And Gas Company Closure seal for high pressure vessel
JPS638476U (enrdf_load_stackoverflow) * 1986-07-04 1988-01-20

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534181A (en) * 1967-05-06 1970-10-13 Dual Gebruder Steindinger Pivotal tone arm with light beam pickup

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534181A (en) * 1967-05-06 1970-10-13 Dual Gebruder Steindinger Pivotal tone arm with light beam pickup

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860766A (en) * 1972-05-31 1975-01-14 Tokyo Shibaura Electric Co Optical signal reproducing apparatus
US4710912A (en) * 1986-06-02 1987-12-01 Greene Hugh W Air cushion-optical data read head

Also Published As

Publication number Publication date
GB1285611A (en) 1972-08-16
JPS5029321B1 (enrdf_load_stackoverflow) 1975-09-22
DE1810984A1 (de) 1970-06-11
FR2024265A6 (enrdf_load_stackoverflow) 1970-08-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH, 7

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DUAL GEBRUDER STEIDINGER GMBH U. CO. 1.K,;REEL/FRAME:004356/0863

Effective date: 19841212