US975596A - Acoustic diaphragm. - Google Patents

Description

w. w. YOUNG. I] ACOUSTIC DIAPHRAGM.

- APPLICATION FILED MARIQB, 1910.

" 975,596. 1 Patent d Nov. 15, 1910.

fps l- T113. I 7 F113... 4:

A froze/mm;

an mal) strairns Paras @FFICE.

WILLIAM YOUNG, GE SPRXNGFZELD, MASSACHUSETTfzL ACOUSTIC DIAPHRAGM.

Applicationfiled March 28, 1910. Serial No. 552,017. r

boxes of talkin -machines, althou' h by no means restricted to suohuse, an consists essentially of a perforated disk of'suitable material which has irregular or broken surfaces and'also has burs formed thereon, a

thin covering or coverings of suitable mate-- rial on such disk for the perforations th'ere- 'in, and'a'suitable coating of material or 20 materials capable of being applied in s'olu tion andthen hardening upon said disk and in such perforations and said covering or coverings, the latter being permeable by such solution, all as hereinafter set-forth. a

The above-mentioned coating should be of a nature which insures the :required'pernianent unity between it and the parts to which it is appliedwhile in solution and which adds materially to the excellency, efficiency, and value of the diaphragm By the term solution, as herein employed, is meant'any compound einulsion, or any character of mixture of suitablecomposition toproduce the hard, permanent, and exceedingly advantageous or beneficial coating to which special attention has been called.

The object of my invention is to produce an acoustic diaphragm, of the above indicated class, which possesses practically all ofthe desirable as well as the essential characteristics and qualities of a device of this kind, among which characteristics or qualities may bementioned' durability and stability, resil ency and resonance, capability of giving out clear, loud and distinct tones of great volume and depth, and of evenly distributing the sound waves, and immunity from blasts and scratching sounds andother alien and discordant noises.

Other objects will appear in the course of the following description.

I attain the objects and secui'ethe advan tages of my invention by the means illustrated in the a'ccompanying drawings, in which--- Figure 1 is aside view of one form of Specification of illetters Patent.

-device.-;-' I

1S1In1lar figures? refer'ito similar -partse throughout the several views.

disk that, maybe used ini'ny invention; Fig. 2, a ,,s1n11-lar view of-a similar. disk fora Patented Nov.--15, 1910.

similarpurpose, but slightly modified; Fig.

3, a side view of a finished diaphrag nyl 1g..- 4, a side v ew of a slightly modifiedfform of, f

diaphragm, and, Fig. 5, a greatly. enlarged center-pf a diaphragm which embodiesthe aforesaid invention in a practical form, as do in partaor in whole the other. v1ews..

and exaggerated cross-section through the Some of the covering and somebf they",

coatingv are omitted from-the last vi'ewpbut' it willibe understood that in; reality the'fcovr ering extends to the right of the center, over the burs, as far .as itdoes tothe left ofgthe, center,'iandtheacoating is over the entire Diaphragi'ns such as mine;arcinvariably round, hence asmember lin the shape of a has its surfaces broken up, by 'pebbling or employed by me as the baseor major at 'ele nent ot my invention; This disk is thin,

pitting, as represented at 2, is provided with a number of burs 3 which are struck out of,

said diskg andis perforated'so as .toform a number of clean-cut-holesd therein or there, through. The center of they disk Lm'aybe f left undisturbed, save for the pitsQandthe corresponding'convexities or .protuberances, I

as shown in Fig.1, or said; center may be dished on one side and correspondingly--- bulged on the other side, as shown at 5.111

the other views.

The holes 4- are transformed iutoavhat may be termed-lesser diaphragms bymeans i of one or more very thin coverings 6 and a coating 7. In Fig. 3'there is one of these coverings 6 for each hole 4, while inFig. 4:"

only one such covering is employed, each covering 111 the first instance being concentrio with its hole, and the single covering, in

the second instance being concentric withthe disk 1. \Vhen the single covering is used, it may be larger than the one shownin Fig. 4, as much larger as may be desired up to thegfull superficial area of thedisk p'sis. not of vital importance, for the sake ofia y. to make them round.

1. Although the shape'o't thecovcrin pearance I prefer The coating 7 is on both sides of the disk 1 and the covering or coveringsG,'and is th'e medium by means of which the latter are fixed to the former.

'The disk 1 may be made of a variety of ticulars is permissible.

different kinds of metallic and non-metallic materials, but any material to be adaptable for the purpose should be thin, of course, and must be capable of receiving and retaining the coating 7 and possess the necessar ualities of then producing the required c tect. Thin sheet-alu minum and pure'linenfiber'paper or cardboard are among the best materials and -givesomc of the best results.

The pits 2 and the convexities or protuberances produced thereby ,are generally very numerous, quite' small, and close togther, although some variation in these parl- Their arrangement may be regular or irregular, as desired. An unbroken ring 8 may be left on each side of the disk 1, outside of the pits and protuberances. These plane-surface rings 8 afford smooth, sound-box connecting bearings for the dia hragm.

The urs 3 are formed by punching thein out of the disk 1 in such a way as to leave smooth, hollow, conical protuberances, through the small ends of which will be usually minute openings. These burs are preferably arranged radially around the dished center, or a corres onding area, of

the disk 1, four (more or ess) to a radius,

has

with a hole 4} between adjacent radii, substantially as shown, but this order or arrangement of burs and holes is subject to some modification, and the number of holes as well as the number of burs may be changed.

The holes 4 will, as a rule, be round, although this is not imperative, and there may be considerable variation in their size.

I use for the covering or coverings 6 very thin fabric, such as tissue-paper.

The material or combination of materials used for the coating 7, and which is applied in any suitable manner to both sides of the disk 1 with its covering or coverings 6, must be of such a nature that it will adhere firmly to and intimately and permanently unite with the parts, and also fix such covering or coverings securely to said disk; furthermore, the nature of the coating must be such that it will so unite with the other'elements and of 'zinc,and an earth cement, mixed together with the roportions of about one part each of the oxid of zincand the cement to about twenty parts of the silicate of soda or silicate of potash. These proportions may vary to mately its entire area, provi a considerable extent without seriously atfecting the efiiciency of the resulting coatmg. I

As I am aware that other coating substances or materials will give the desired r sults, I do not intend to restrict myself to anyparticular coating substance or mate: rial or combination of the same suitable for the purpose.

Each of the elements or features herein described and which together make up this diaphragm, with the possible exception in some cases of the dished center, is indispensable tothe attainment of the desired end, as I have found by long and careful experiment, the pits, burs, lesser diaphragms, and coating each contributing something essen tial'to the perfection required of an acoustic diaphragm designed for talkingmachine with the dished center. 1

In practice, the pits and their protuberances are usually finer than they appear in the drawings.-

In addition to the variations or modifications already noted others may be made without departing from the nature of my invention.

What I claim as m invention, and desire to secure by Letters atent, is-

1. A disk, for a diaphragm of the class described, consisting ofa pitted member having burs thereon and holes therethrough independent of the bur openings.

2. A disk, for a diaphragm of the class described, consisting of a member having its structure broken up throu hout approxided with burs, and having holes independent of the bur openings.

3. A disk, for a diaphragm of the class described, consisting of a member having protuberances over approximately the entire superficial area of its sides, provided with burs, and having holes'independent of the bur o enings.

4. dis for a diaphragm of the class described, consisting of a pitted member having burs thereon and holes therethrough independent of the bur openings, and provided with a dished center, such burs and holes being located between said dished center and the periphery of said member.

5. A diaphragm, of the class described, consisting of a pitted disk having burs thereon and holes therethroughindependent of the bur openings, covering material on such disk for such holes, and a hard overlying coating on said disk and covering material covering material with the disk.

6. A diaphra 0 the class described, consisting of a pitted disk having burs thereon and holes therethrough independent of and analogous purposes. And injmany if. not most instances, 1t is not well to dispense and in the disk perforations and uniting said the bur openings, and 'provided with a on and holes therethrough independent of dished center, such burs and holes being 10- the bur openings, covering matemai on such cated between said dished center and the pedisk for such holes, and a hard overlying rip'hery of said disk, covering material on coating on said disk and covering materiai 5 such disk for such holes, and a hard oversaid covering material with the coating 15 lying coating on said disk and covering thereon forming lesser d igphragmsi material and in the disk perforations and W. YUUNG,

uniting said covering material With the disk. Witnesses: a

7. A diaphragm, of the class described, 1 31A. CUTTER,

1e consisting of apitted disk having burs there- 1 -A. C. .FAIRBANKS.

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