US1828190A

US1828190A - Method of preparing a magnetizable body to receive and reproduce wave frequencies

Info

Publication number: US1828190A
Application number: US462069A
Authority: US
Inventors: Richard B T Kiliani
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-06-18
Filing date: 1930-06-18
Publication date: 1931-10-20
Anticipated expiration: 1948-10-20

Description

Oct. 20, 1931. R, B T, K|| |AN| 1,828,190

METHOD 0F PREPARING A MAGNETIZABLE BODY TO RECEIVE AND REPRODUGE WAVE FREQUENCIES Filed June 18, 1950 ATTORNEY Patented Oct. 20, 1931 UNITED STATES PATENT OFFICE RICHARD' B. T. KILIANI, 0F DETROIT, MICHIGAN, ASSIGNOR OF ONE-FOURTH TO ARTHUR GARDNER, OF DETROIT, MICHIGAN METHOD OF PREPARING A MAGNETIZABLE BODY T RECEIVE A N D REPRODUCE I FBEQUEN'CIES Application led June 18,

My invention relates to a new and improved method of preparing a magnetizable b ody to receive and reproduce wave frequencies.

I am, of course, aware that magnctizable 'Ig bodies have heretofore been prepared f or the purpose above stated, but, prior to my 1nvention, much trouble has been experlenced 1n the use of said prepared bodies, in recelvlng, retaining and reproducinr the Wave frequen- A cies, duc to the metho s followed 1n the preparation of such bodies.

A method for electro-magnetically recording telephone or telegraph signals was .1nvented by Vlademar Poulsen in 1898, but with 16" the method described and used by him, and

as improved upon from time to time by himself and others, it is impossible to satlsfac- A torily record and reproduce speech or music which will compare in quality with even the 20 poorest type of modern phonograph. He, and

others following him, described methods for erasing such electro-magnetic records and for preparing the magnetizable body on whlch the record was made, for a subsequent record.

All these methods provided for moving the lnagnetizable body ast a magnet, so that 'the magnetic conditlon of the bod was brought to some single predetermme level.

It is a simple matter to erase a prevlous record, since merely passing a ma et of whatever kind over the ma etizab e body will achieve this object, but t e magnetizable body is then not in a suitable magnetic condition to receive and hold a subsequent record such as is desired.

My invention contemplates a new method for erasing a previous record and for preparing the lnagnctizable body for a subsequent record, which brings the body into a more suitable magnetic condition for taking and retaining a record than was achieved by the use of the prior art methods.

Under my invention, a record on a magnetizable body may be erased as hereinafter described, the magnetizable body being thus brought into a suitable magnetic condition for a subsequent record to be made. The same method ma be used for preparing a magnetizable bo y on which no record .as been previously made, since this preparation WAVE 1980. Serial No. 462,069.

for the following record, the body is causedv to move past a particular system of magneti, with the result that its magnetic condition is such as will permit its taking and holding a record which is a true and correct copy of the original Waves which it is desired to record and reproduce..

A record made on and reproduced from a magnetizable body prepared by thev method aining a satisfactoryy disclosed in the present invention is in such y a condition that it may be reproduced an innumerable number of times and is permanently retained on the magnetizable body. This permanent retention of a recor-d on a body so prepared is' proven by the fact that I have conducted experiments in which I have reproduced records made on a body prepared in accordance with my invention, a great number of times, with the ideal of simulating the effect of several years use. `Other methods of preparing the magnetizable body, described and known up to this time, do not permit attaining this perfection in a record.

The particular system of magnets above mentioned is so arranged that two or more magnetic poles of opposite polarity act upon the magnetizable body, so that it is lirstsubjected to the action of one pole, being magnetized with a certain polarity of a desired flux density, and immediately thereafter is subjected to the action of a second pole which magnetizes it with the opposite polarity of a different flux density, and so on, each succeeding pole beiner of opposite polarity to the one immediatey preceding it, and magnetizing the wire with a different flux density from that of the magnetic pole preceding it.

Any suitable means may be employed to obtain the desired effect of opposite polarity and flux density which magnetizes the magnetizable body in a different manner from i that of the ma etic poles immediately preceding and fo owing any particular pole. Among these may be mentioned permanent Amagnets of e ual strength, but the surfaces of electro-magnets, the effect of ma etization of the magnetizable body with di erent flux densities for the' various poles which act u n it, may be obtained b using cores of di erent materials, cores o unequal cross-section, effective surfaces of unequal area, windings of the same or a different number ofturns, energizing current of the same or of dierent values, etc., or an combination of these or other variables w ich will give the desired effect of magnetization of a certain polarity of a desired flux density, followed by magnetization of the opposite polarity of a different flux density.

, In the accompanying drawin s:

Figs. 1 to 9 inclusive are ia'graiiimati'c views illustrating various forms of magnetizing apparatus that rmay be employed in the practice of my invention; and

Fig. 10 a diagrammatic view of a form'of means for assin the magnetizable body intoclose re ations ip with the magnetizing ap aratus.

eferring to the drawings, 4 designates a magnetizable body or wire that is to be prepared; and in the forms of Figs. 1, 2 and 3, 5 and 6 designate permanent magnets of opposite polarity. Fig. 1 shows the magnets of equal ma etic flux densit and havin effective sur aces, as indicate by a and of unequal area.

Fig. 2 shows the magnets with equal effective surfaces a and c, the magnet 6 having a .windin d and a battery e to change its flux density, while Fig. 3 shows the magnets with unequal effective faces or surfaces, and having the winding and battery associated therewith for the same purpose as the form of Fig. 2.

In Figs. 4 to 9 inclusive,I have illustrated various ways of utilizing electro-magnets in the practice of my invention. For example, Fig. 4 shows a pair of electro-magnets 7 and 8, the windings of which are of an equal number of magnetic turns, said windings being in the same direction and in series with a batteryy 9, whereby the effect of opposite polarity is attained with constant flux densities; and in Fig. 5, the windings of said magnets 7 and 8 are each connected in series with a

battery

10 and 11, respectively, the directions of current flow being opposite to produce opposite polarity.

Y Fig. 6 illustrates a similar form to that of Fig. 5, the' core of the electro-magnet 7a, however, being of lesser cross section than the core of electro-magnet 8, thereby providing unequal flux densities, as well as opposite Y polarit Fig. is similar to the arrangement of Fig.

5, with the exception that the electro-magnet 8a has a smaller effective area m than that of the .magnet 7, so as to produce unequal flux at the region traversed by the magnetizable body 4.

In Fig. 8, the electro-magnet 8b is provided with a greater number of magnetic turns for the purpose of inducing a greater flux density therein than the liux density of the magnet 7 and, similarly, in Fig. 9, unequal lux densities are produced by means of unequal energizing currents generated by the batteries 10 and 12.

Thus, it is seen that various combinations of magnets and electro-magnets may be provided for the pur ose of obtaining opposite polarit and ual) or unequal flux densities.

In ig. 10, and B designate two reels, from one of which, for example B, the Wire is unwound, and on the other of which (A) the wire is wound. A is driven by suitable means (a belt drive is shown) by a motor M, which is rovided with suitable means such as a clutc etc., to drive A or B, as desired. 1n the exam le shown, A is pulling on the Wire, with t e result that it is drawn (past the magnets, generally represented at in the direction from B to A. Reel B is not connected to the motor M in this case, but is retarded by a brake, not shown, to maintain a suitable tension on the wire.

In practicing my invention, the magnetizable body or wire 4 is translated in closed proximity to any. .of the magnetic systems )ust described, the effect of which is to induce a magnetism in the said body or wire, whereby the same is conditioned to receive and retain a record thereon, and consisting of a series of magnetic impulses produced by sound or light waves of any range of frequencies by means of the apparatus -and method shown and described in my companion application, Serial No. 462,068.

As stated, it has been found that a magnetizable body, prepared in the manner herein set forth, will receive a magnetic record more readily than any body prepared heretofore, or than an unprepared or de-ma-gnetized body. Also, the record received thereby will be retained without becoming distorted or destroyed even when brought into contact with itself or other record-bearing wires, as for example, upon a reel.l

I claim:

1. The method of preparin a magnetizable body to receive a record o any range of wave frequencies which consists in subjecting the body to the action of three or more magnetic poles of different magnetic effect.

2. The method of preparing a magnetizable body to receive a record of any range of Wave frequencies, which consists in subjecting the body to the action ofA three or more magnetic poles of different olarity.

3. The method of preparing` a magnetizable body to receive a record of any range of Wave frequencies, which consists in subjecting the body to the action of a. plurality of magnetic oles of opposite polarity and of different ux density 4. The method of preparin a magnetizable body to receive a record o any range of Wave frequencies, which consists in subjecting the body to the action of a magnetic pole to impart to the body a magnetism in one direction and then subjecting the body to a magnetic pole of different polarity than the first to impart a magnetism to the body of different value and in the opposite direction.

5. The method of preparing a magnetizable body to receive a record of any range of Wave frequencies, which consists 1n subjecting the body to the action of a, plurality of magnetic polesof different linx density at the place of magnetization of the body.'

Y 6. The method of preparing a magnetizable body to receive a record of any range of wave frequencies which consists in subjecting the body, in motion, to the action of a plurality of magnetic poles of different flux density.

In testimon whereof I aix m signature.

R CHARD B. T. LIANI.