US2027168A - Vibration translating device - Google Patents

Description

Jan. 7, 1936. H. a. HARRISON r 2,027,163

' VIBRATION ,TRANSLATING 021mm Filed Sept. 29, 1934 %AMP E:I us. INVENTOR LL95 I J By 1. c. HARRISON" ATTORNEY riotou 1, 1536 l 2,027,168

. UNlT ED STATES PATENT OFFICE VIBRATION TRANSLATI'NG DEVICE Henry G Harrison, Port Washington, N. Y.-, :issignor to Bell Telephone Laboratories, Incorrorakted, New York, N. Y., a corporation of New Application September 29, 1934. Serial No. 746,073

8 Claims. (c 179-100.41)

This invention relates to phonograph reproted. The magnetic circuit of this reproducer inducers and more particularly to those capable of cludes a permanent magnet l contacting at one playing both vertical and lateral cut records. end a central pole-piece I I and at the other end, The object of the invention is a reproducer of not show t e Outer D -P which a this type which is adapted to reproduce either serves as abottom closure for the casing IS. The 5 vertical or lateral cut records and also to give D -P e ll extends downwardly intO- the simultaneous separable reproductions oi'vertical Stantially Circular Opening in the P -p cut and lateral cut recordings in the same groove. 12 a d s u 'c t d at its o er e d to form two According to the invention the moving system D p d is o he coi s 1 and 8- Ihe 10 of the reproducer has two generating elements, D p are contoured to form Short Working 10 preferably coils laterally spaced andv rigidly'conp 9 and 20 at the Outer Sides of the coils. nccted to a single stylus. The coils are vibratably The Coils are WOund On a l twe t du a um supported in operative relation to a suitable mag- 0 p 2| W ic has twoupwardly e te t bula net c circuit by a plurality of supporting springs pieces o upp r ing t e 0 8 H an 8 5 which permit the coils to move vertically either as Shown more C y Pl'ojecting i th Same or n opposite directions depending. downwardly from the center of the cup is a lighton whether th stylus is d i from vertical or weight tube 24 fitted at its lower end with a stylus lateral cut records. 25. This vibratory system is mounted in opera- Bothleads'df each coil are brought out so that tivc relation to t magnetic ci uit y m an 0' either coil may be used alone as a universal gencf the pa parallel cantilever s in s 6. 21 crating element, switching means may be prowhich are clamped t t e po e-p e H by a vided for reversing the relative polarity of the coils Screw so that the outputs of both coils may be utilized The upper spring 26 s p e erably -shaped it eith t of record or t 11 may be and is conveniently made from thin sheet mate- 25, connected to suitable external circuits to provide rial 50 that it 15 of y low Stiffness for t ca 25 separate reproductigns of tw ream-dings 1n t and torsional deflections but of relatively high s r rd r ov A ystem of thi tt type stiffness for lateral deflections. In proportioning is disclosed a d clai d i my copending uthe spring to obtain the necessary high ratio of cation Serial No. 742,761, filed September 5, 1934. Stiffncsscs for dif e t d fl t ns, t is s mc- These and other features of the invention will mes advantageous to perf the pr n 26 30 be more clearly understood from the following dewith holes, such as 29 and 30. The lower sprin tailed description and the accompanying d 27 should be of low stiiiness for both vertical and ing in whi h; lateral deflections and these requirements are i Fig. l is a general view, partly in section, of a convenintly'met y using a Single r nd o f e reproducer according to the invention showing wire as shown.

' particularly the vibratory system and its relation e the Stylus 25 is driven by a Vertical Out to the magnetic circuit; record the springs 26 and 21 will both deflect Fig. 2 is a perspective view of the vibratory vertically, the coils l1 and i8 will be vibrated vertically in the same direction in the gaps l9 and system; Fig. 3 is a vertical sectional view taken as in- 20 and the currents generated in the coils will 0 dicatedby the line 3-3 in Fig. 1; correspond to the stylus vibrations. When the Fig. 4 is a horizontal sectional view taken along t us is dr v y a a a u d. t etthe line 4-4 of Fig. 1; eral vibrations will deflect the spring 21 laterally Fig. 5 is acircuit diagram showing a separate but inthis casethe spring 26, due to its high reproducing system for each of the generating .lateral and low torsional stiffness, willact as a elements; and pivot by deflecting torsionally so that the coils Fig. 6 is a diagram of a circuit for utilizing the are vibrated vertically but in opposite directions. output of both generating elements when the As in the previous case, both coils will generate reproducer is used on either hill and dale or currents corresponding to the stylus vibrations lateral cut records. but due to the opposite directions of their vibra- 5O Refering now to the drawing, the structures 01' tory movements the currents will be of relative- Figs. 1 to 4 have been shown considerably en- 1y opposite polarity. larged and the conventional portions of the re- If the leads of coils l5 and iii are connected producer in Fig. l which are not essential to an to separate amplifiers 3|, 32 and loud-speaking understanding of the invention have b en m tr ceivers 33, 34 as shown in Fig. 5, it will be ap- 55 'tions of the stylus.

' 3:111 a reproducer, a magnetic circuit and a i vertical vibrations of. the stylus;v

that either or both of these reproducing systems is operative to reproduce either vertical or lateral cut records. A more economical system for utilizing the output of both coils from either type of record is shown in Fig. 6 in which only a single amplifier 35 and a single loudspeaking receiver 26 are used, one of the coils, l5, being connected directly to the amplifier and the other coil being connected through a reversing switcht'l. When using "the system for'vertical cut records the currents are in the same direction in both coils and the switch is therefore closed to the left to connectcorresponding terminals of the coils in parallel. When lateral records are used the currents-are'in" opposite directions in the two coils and by closing the switch to the right the connections-ofcoil I5 are re versed so that the currents are additive in the amplifier input circuit asbei'ore. The invention has been described with reference to a device having moving coil generating elements but itwill be-apparent that applicants vertically resilient pivot construction for sup porting the vibratory system is equally. applicable .to. electromagnetic, electrostatic or other known types of reproducer or other vibratory translating device. Variou s changes may also be made in the design ofthe device shown but the invention is intended to be limited only by the scope of the followingv claims.

What is claimed is: I Y 1. In a reproducer, amagnetic circuit, a moving system comprising a pair of spaced coils in operative relation to the circuit and a stylus for i driving the coils and resilient meanssupporting the system between the coils for both lateral and .2. Inc. reproducer, a-magnetic, circuit, a moving systemcomprising a pair ofspaced generating-elements in operative relation to the circuit 'and' a stylus for driving the elements and two spaced springs of differentlateral stiffnesses secured to the system between the coils supporting the system for. both lateral and vertical vibramoving system comprising a pair of spaced coils,

a coil supporting member, a stylus for driving said member and means for mounting the system with the coils in operative relation to the circuit including a spring attached to the member between the coils and free to deflect both vertically and torsionally in accordance with the stylus vibrations.

4. In a reproducer, a magnetic circuit, a member carrying two laterally spaced coils in operatlve relation to the circuit, a stylm, means conmeeting the stylus to the member between the coils and supporting means therefor including a spring between the coilsifree-to deflect both vertically and .torsi'o'nally but not in a lateral mode. 5. In a universal phonograph reproducer, the combination with a magnetic circuit having two spaced air-gaps and a moving system compris- I ing two coils, means for supporting the coils in spaced relation for vibration in the air-gaps, and a stylus for driving the coils, of spaced parallel spring supports for the system constituting a vertically resilient pivot between the coils.

7 6. A moving system for phonograph reproducers comprising 'a lightweight cup member having two laterally spaced upwardly extending tubular coilsupports, a coil on each of the supports, a stylus'connected to the cup between the coils and spaced parallel springs of difierent lateral stiiinesses for supporting thesystem for vertical and lateral'v'ibrations "of the stylus.

"7. In a'universalreproducer, a magnetic cir-" cuit including two air gaps, a'pair of laterally spaced generating elements in the a stylus,

a member connecting the stylus to the elements,

a vertically and torsionally resilient spring of high lateral stiffness constraining the elements to move in the same direction for vertical stylus vibrations and, in oppositedirections for lateral stylus vibrations,'jand means for combining the outputs of the elements in aiding relationship when vibrating in; either the sameor opposite directions. I V v Bfiln a reproducer, the combination with a magnetic circuit including an outer pole piece 'having'an epertureand an inner pole piece projectinginto the aperture and having furcations defining arcuate gaps on opposite sides of the aperture and'a moving system comprising a coil on each furcati'on having one side disposed in the gap and'the other side flattened to increase the spacing between the 00115, a stylus and means for connecting the stylus to the coil'aoi resilient sup Coils. mNRY C. HARRISON.

porting means secured to the system between the flattened sides of the 50

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