US2422995A - Tuner construction - Google Patents

Description

' June 24, 1947. l. N. voRIE TUNER CONSTRUCTION Filed'Aug. 8, 1945 R.e a. mu .N N0 R E w Q g m c 0 iteri june 24, 1947 TUNER CONSTRUCTION Innokcnt N. Vorie, Elma, N. Y., assignor to Colonial Radio Corporation, Buffalo, NY,

Application August 8, 1945, Serial No. filliifiiifi Claims.

mention. relates to tuner construction,

articuiarly to such construction par- .1 i for use in ultra high frequency such as television and frequency or all modulated radio equipment, where the ncies dealt with are measured in terms of .cycles rather than kilocycles. is object of this invention to provide a 5 construction for the purposes described, in o. the equipment is extremely compact, ii is a further object of this invention to proe such apparatu 1 which a relatively large gs may be covered with a high Q.

still a further object of this invention to .e apparatus of th class described in which 1 changes in tuning frequency may easily be do without excessively small manual move-- t is a further object of this invention to prosuch apparatus employing permeability tung, which is free from the defects heretofore characteristic of such tuning.

it is a further object of'thi invention to pro ride such apparatus, which is free from micro phonic properties.

is a further object of this invention to protuning apparatus of the class described (which is generally superior to that heretofore it .re and used for the purpose.

Still other objects and advantages of my invention will be apparent from the specification,

The features of novelty which I believe to be "'acteristic of my invention are set forth with ticularity in the appended claims. My invenitself, however, both as to its fundamental inciples and as to its particular embodiments,

best be understood b reference to the speci- "tion and accompanying drawing, in which l is a side elevation of a tuner in accordc with my invention, with the pointer distill from its true position (for convenience illustration) ig. 2 is a front elevation thereof with the coil ed for convenience of illustration, and

,3", 3 is a section on lines 3-3 of Fig. l.

is generally recognized that permeability .g has certain advantages when applied to tus operated in the present broadcast frencies. However, in attempting to apply per- "'1 oilit y tuning principles to ultra high freencies, certain difficultie are encountered. in. the ordinary form of permeability tuner, a inuted iron core is moved lengthwise within coil, thereby changing its resonant frequency.

hen such construction is attempted to be ap-.

plied in the ultra high stance, to provide a to 162 megacycles, it v. ductance is of the order or 0.1 to 0.05 micro. depending on the minimum distributed capac ty of the circuit, and a coil having such. inductan i is quite small, having only a few turns; usual permeability core is attempted to I the axial movement of the core to cover the hand. will not be substantially over /8".

It is apparent that to permit selecti tions with such a small movement of treme accuracy of parts is required, and atively high step-clown ratio mech former must be employed between the knob and the core, all of which meability tuning for such applications imp). tical or uneconomlcal.

According to my invention, I provide which will operate over the ape out requiring any such arrangements, a d which the full 180 of the manual tuning lunch is available for tuning and may be applied directly to the permeability core. This result is obtained by utilizing and combining in the tuner the prim ciples of permeability tuning, of short-circul.J turn tuning and the 180 coupler.

Instead of moving the permeahi ii ty c: Wise Within the coil, I prefer to rotate instead, and to provide the coil wound. th th plane of its turns at an angle of i5 with the axis of the core, and I inlay or form. within. the core a short-circuited turn of a good conductor, such as copper or silver, of the same Width as the coil, and likewise mounted with its plane at an angle of to the core axis.

Rotation of the core, as will be understood, through a complete turn will cause the core to pass through two position, 186 apart, in. one of which the short-circuited single turn is perp dicular to the coil windings and, therefore, is of minimum effect, permitting the iron core to exert its full effect, and increasing the inductance of the coil to a maximum.

At a position from. this, the short turn is in the plane of the coil and 51366111 v with in it at all points, thereby reducing the inductance to a very low value. At positions intermediate these two, the inductance of the coil will have an intermediate value.

Referring now more particularly to the ing, the coil may be formed as shown at ill, and in this instance I have indicated a coil comprising! 1 turns of copper wiring, or tubinl. This 1;;

' 3 fixedly mounted around core II, which is free to rotate within the coil.

The core is preferably formed of any suitable mixture of powdered iron and a binder, as will be understood by those skilled in the art, and carries upon it single short-circuited turn H, which may be copper or silver, the width of which is equal to the width of the coil at its widest point, and the coil, core, and turn I2 are so positioned that at some point in the rotation of the core, turn [2 lies directly under coil l and at another point 180 therefrom it extends at right angles thereto.

The core may be mounted in pulley 13 at one end, and pulley I 3 may carry shaft l4 extending through frame I5, which carries upstanding end portions I6 and I! to receive and support the core. The other end of the core may be secured for rotation by ball l8, fitting in depressions in core II and in mounting screw l9, which extend inwardly through frame portion ii. The cell may be supported by passing its ends through openings in bracket 20 of insulating material secured between end plates l8 and ll. Dial 25, suitably calibrated, may be carried on end plate I1, and pointer 26 carried on shaft H for reading dial 2!.

Rotation may be effected by a knob on shaft H, which knob may be turned directly by the operator, or if desired, an offset drive may be employed utilizing knob 2| mounted on shaft 22 extending through end plate i! and terminating in driving pulley 23, from which belt 24 or cord drive may extend to driven pulley l3 carrying the core.

With such an arrangement and with a minimum capacity in the circuit of 40 micro-microfarads, I have been able to cover a range of 80103 megacycles with a Q of 170 and 110 respectively.

In the specification I have explained the principles of my invention and the best mode in which I have contemplated applying those principles, so as to distinguish my invention from other inventions; and I have particularly pointed out and distinctly claimed the part, improvement, or combination which I claim as my invention or discovery.

While I have shown and described certain preferred embodiments of my invention, it will be understood that modifications and changes may be made without departing from the spirit and scope thereof, as will be clear to those skilled in the art.

I claim:

1. In tuning apparatus, in combination, a core orcomminuted paramagnetic material, longitudinally fixed but free for rotation, a. coil surrounding said core, said coil having the plane of its windings disposed at an angle to the axis of said core, and said core having a short-circuited turn of good conducting material encircling said core, and having its plane disposed at an angle with respect to the axis of the core.

2. The combination claimed in claim 1, in which said short-circuited turn is positioned on said core within the limits of said coil projected perpendicularly upon the core.

3. The combination claimed in claim 1, in which the angle between the plane of the coil windings and the axis of the core, and the plane of the short-cireuited turn and the axis of the core is 4. The combination claimed in claim 1, in which the shprt-circuited turn is inlaid in the material of the core.

5. The combination claimed in claim 1, in which the surface of the short-circulted turn lies substantially flush with the surface of the cylinder.

INNOKENT N. VORIE.

REFERENCES CITED UNITED STATES PATENTS Number Name Date Clough Apr. 17, 1928 Certificate of Correction PatentNo. 2,422,995. June 24, 1947. INNOKENT N. VORIE It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 2, line 39, for 186 read ould be read with this correction therein 180; and that the said Letters Patent sh that the same may conform to the record of the case 1n the Patent Office,

Signed and sealed this 30th day of September, A. D. 1947.

THOMAS F. MURPHY,

Assistant Gommz'ssioner of Patents,

Certificate of Correction Patent N 0. 2,422,995. June 24, 1947. INNOKENT N. VORIE It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 2, line 39, for 186 read 180; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice,

Signed and sealed this 30th day of September, A. D. 1947.

THOMAS F. MURPHY,

Assistant Commissioner of Patents,

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