US1459605A - Phonograph reproducer - Google Patents

Description

June 19, 1923. 1,459,605

A. w. SCHREINER PHONOGRAPH REPRODUCER Original Filed March 2 1921 2 Sheets-Sheet 1 June 19, 1923. 1,459,605

A. w. SCHREINER I PHONOGRAPH REPRODUCER Original Filed March 2. 1921 2 Sheets-Sheet 2 INVENTOR Patented June 19, 1923.

ARTHUR SCI-IREINER, OF BROOKLYN, NEW YORK.

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Application filed March 2, 1921, Serial No. 449,256. Renewed May 17, 1923.

To all whom it may concern:

Be it known that I, ARTHUR W. SoHnnI- NER, a citizen of the United States of America, residing at Brooklyn, in the county of Kings and State of New York, have invented certain useful Improvements in .Phonograph Reproducers of which the fol.-

lowing is a specification.

My invention relates to a phonograph reproducer primarily designed to improve the tone color and fullness of note so greatly desired in this class of instrument.

I have found that very remarkable improvements can be made in the clearness and volume of music played from ordinary phonograph records whether they be old or new, and regardless of whether they be orchestral vocal, band, or simple instrumental pieces. Particular improvement can be noticed in the reproduction of notes from the piano.

In particular, I have discovered that the method of supporting the needle is of the utmost importance, and that it must be so supported to be movable in every direction so as to give every slight indentation on the record opportunity to operate the diaphra'gm. I

Furthermore I have discovered that the volume of the reproduction may be greatly increased by using both sides of the diaphragm. To this end I have devised novel means of valving the air pulsations from the diaphragm so as to effect a continuous flow of waves forward through the phonograph horn or emitting tube. This also produces a most clear sound free from the usual stiffness and apparent incompleteness of note. I attribute this quality largely to the straight forward flow of the sound waves resulting from my valving arrangement. and the use of both sides ofthe diaphragm. This feature as well as many other of the important points will be better understood by reference to the accompanying drawings, which form a part of this specification, and in which,

Fig. 1 is a perspective view showing my reproducer in use on a phonograph, which may be of any standard design or make.

Fig. 2 is a plan view of the reproducer partly shown in section.

Fig. 3 is a side elevation of Fig. 2.

Fig. 4 shows the detail construction of the needle suppprt.

Figs. 5 and 6 are diagrammatic views showing the valving action of the reproducer.

Similar reference numerals refer to similar parts throughout the drawings.

A record 1 is revolved in the usual manner on any type of phonograph 2 causing. the vibration of the needle 3, incontact with the impressions of the record 1 The needle is held in the socket clamp 4 by a thumb screw 5. A finger 6 forms a continuation of the clamp 4 and isattached at its extremity to the diaphragm 7 by means of a screw and an adhesive wax in the usual manner. Integrally formed with the finger 6 and the clamp 4: is a flange bar 8, and the center of this bar has a small depression 8 to receive the support pin 9 which is rigidly'set in the casing 10. In order to hold the needle 8 and the clamp 1, with its parts 6 and 8 in position against the pin 9, two screws 11 are fastened into the casing with their bodies passing freely through slip holes in the flange 8. Two helical compression springs 12 inserted between the flange 8 and the heads of the screws 11 press the flange against the pin 9 and thereby set theneedle in a universal manner free to move in any direction. The common method of mounting the needle on knife edges permits movement in only one direction and prevents the needle from freely responding to any vibrations 0n the record except those in the one plane of needle' motion. The casing 10 houses the diaphragm 7 andon one side 10 is closed so as to direct the sound waves through a port 13 and thence into a tube 14: which connects to'thecommon tube 15. The tube'is joined to the casing by the flange '1 P, which is held in position under the tension ,of two springs 16 guided by screws 17 The diaphragm is set in the casing between rubber gaskets 18 and in the usual manner. In the ordinary construction the other side of the diaphragm is left open, but I have devised the auxiL iary valving diaphragm 19, which is set in front of the principal diaphragm 7 and is vibrated by air pulsations from it. In order that this auxiliary diaphragm may transmit the sound waves thrown toward it by the principal diaphragm and yet not follow the principal diaphragm upon its return to the opposite side, a perforated wall 20 is disposed between the principal and auxiliary diaphragms and acts as a check to the auxiliary diaphragm, permitting the movement in only one direction. The auxiliary diaphragm is mounted in a casing 21 which houses its outer side. A central port 21 in the rear wall of the casing leads to the tube 23 which in turn carries the sound into the commontube 15. The tube 15 leads into the tone-arm 24, which may be of any standard design. The sound waves then pass into the horn25 and-are distributed. in order to emit a small amount of the sound produced by the diaphragm direct from the reproducer, the plate 20 is flared at its edge and also an annular set of ports 26 are cut in the casing '21 around the auxiliary diaphragm. 19. I find that this sound emission directfrom the reproducer gives a most desirable effect in the reduction 'of harshness and scratch. Likewise the support of the reproducer casing 10, by springs 16 and 17 to flange 14? is important in the reduction of-harshness and needle scratch.

The operation may be shown to advantage by reference to the diagrammatic Figures 5 and 6. The record isput in motion and the impressions thereon vibrate the needle, which is somounted on a universal pivot pin that it responds to every slight wave in a'lateralzrecord and transmits this vibration through the arm'G' to the princip'al diaphragm 7. This diaphragm is free to moveina forward and reverse direction. InFig. 5- it is shown deflected in its forward direction, whereupon a pulsation is sent through the tube 14: and into the discharge ilOI'l'L' The movement ofthe diaphragm 7 forward as shown in Fig. 5, causes .a rarefaction in the space between the diaphragm 7 and19and a condensation Within the tube 14. Plate 20 prevents the diaphragm 19- being pushed in the same direction-by the atmospheric, air in tube 23. The ports 26 short circuit the unequal pressure condition in tube 23, permitting an intake or exhaust as required to meet varying compressions in tube 14 and the discharge horn. Movement of the diaphragm 7 in the reverse direction causes an air compression in the space ,between diaphragm 7 and diaphragm 19,

which pressure is exerted through the perforated wall 20' against the diaphragm 19. The movement of diaphragm 19 in this reverse direction causes a compression in tube 23 which partly passes up to the commonphragms are small. in amplitudebut in the last analysis do n more than create ,condensations and rarefactions-in the leading tubes, and if more than. this. air or gas vibration isset up, the diaphragmsare not functioning. properly and the energy is being wasted.

Having described my invention what I claim as new and desire to secure by Letters Patent 1s,

1. In a phonograph reproducer, a mechanically actuated diaphragm, a conductmg tube disposed. on one side of .andhousing that side of the said diaphragm, a supplementary conducting tube positioned opposite the said diaphiragm, a perforated plate in the end of the said tube anda valving diaphragm free to move away from the said plateresponsive to the outward'movements f the principal diaphragm, substantially as described. i

2.111 a phonograph reproducer, ,a mechanically actuated diaphragm, a conducting tube disposed on one side of andhousing that side of the said diaphragm, a supplementary conducting tube positioned opposite the diaphragm, a perforated plate in the end of the said tube and-a valving diaphragm'free t move away from the said plate responsive to the outward movements of the principal diaphragm, and portsin the conducting tube at the inner side of the auxiliary diaphragm, substantially as described.

In testimony whereof I aiiix my signature.

' ARTHUR YV. 'SCHREINER.

VVitness:

JOHN J D; TAYLOR.

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