US1214610A - Telephone-receiver. - Google Patents

Description

N. TANNAKA.

TELEPHONE RECEIVER.

APPLICATION FILED SEPT. 30. ms.

Patented Feb. 6, 1917.

WJTJVESSES NAHO TANNAKA, or nnw YORK, N. Y.

TELEPHONE-RECEIVER.

Application filed September 30, 1915.

To all whom it may concern:

Be it known that I, NAHo TANNAKA, a subject of the Emperor of Japan, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Telephone- Receivers, of which the following is a full, clear, and exact description.

This invention relates to improvements in telephone receiving apparatus, in which the diaphragms are cushioned and adapted to vibrate more or less bodily or to vibrate simultaneously at the central and outer portions, and in which the diaphragms are placed under the influence of a plurality of clcctro-magnets disposed cooperatively to act on the central and outer portions of the diaphragms.

The main objects of this invention are to provide telephone receivers which are faithful in translating electric impulses into audible sound with least distortion, and to increase the efliciency of the receivers by effectively arranging the electro -magnetic means therein.

With the above and other objects in view, my invention comprises certain detail of construction and arrangement of parts as will be hereinafter more fully described, illustrated and claimed.

The invention will be best understood from the following description, taken in connection with the accompanying drawings as reference, forming a part of this specification. However, I desire to-have it understood that the apparatus shown herein is merely illustrative, and that therefore it is not confined to any strict conformity with the showing of the drawings, being susceptible to modifications and changes, or that such changes may be made, when desired, as to fall within the scope'of the invention as claimed.

In the drawings, similar numerals indicate similar parts, in which- Figure 1 is a sectional view of a telephone receiver, embodying my improvements, partly broken away, and Fig. 2 is a similar view of the same on the line 2-2 of Fig. 1.

Referring to the drawings, the numeral 10 designates a double flanged cup of nonmagnetic metal, which nearly incases all the working parts of the apparatus, having an annulus or a ring 11 preferably clamped at the mouth. This cup rides by its outer Patented Feb. 6, 1917.

Serial No. 53,442.

flange on the open end of a receiver cell 12 which has exterior screw threads to be engaged with the interior screw threads of an ear piece or cap 13. By the engagement of a the cell and the cap, the cup 10 with the ring 11 is firmly clamped therebetween.

In the flanged portion of the cup, an armature diaphragm 14 is cushioned by washers or cushions 15 and 16 of felt or like material, respectively against the ring and the shoulder of the cup. The diaphragm is made in such size as to leave a circular space around its periphery, so that the marginal portions of the cushions will keep it free from direct engagement with the casing, viz. the cup with the ring, the peripheral edges of the cushions reaching to the casing.

At the rear side of the diaphragm, a plurality of electro-magnets 17 are arranged around the center. The cores of the electromagnets are clamped or soldered with the branched or subdivided pole of a permanent magnet 18, the other pole thereof being brought up toward the central portion of the diaphragm nearly to complete magnetic circuits. These electro-magnets may be of any suitable number, but in Fig. 2, I have shown a form having four bobbins or coils as a convenient number. The coils of the electro-magnets are connected in series in such manner that when a current is sent through all of them, similar poles will appear on the same side.

The permanent magnet may be composed of several pieces of magnets, polarized and grouped to form a composite marget. In some cases, the employment of a pair (when there are four bobbins) of horse shoe magnote is desirable, each to influence two cores, without the central projection, the bobbins being accordingly connected. In the claims, by describing permanent'magnets I mean a permanent magnet or, magnets in one of such forms above described, regardless of the number and shape of constituent magnets.

On the central pole of the magnet 18, is pasted or otherwise secured a soft sheet or washer 19 of sponge rubber or like, whose functions are to coiiperate with the Washers 15, 16 in holding the diaphragm, and yieldingly to support and balance the same against the magnetic force, particularly when an excess current tends to draw the diaphragm so as to strike the pole pieces.

The pressure on the cushions or washers 15, 16 is previously adjusted to obtain the best result by varying the thickness thereof and inserting other thin washers, until the diaphragm is under proper pressure at a proper position with respect to the pole pieces.

The terminals of the coils are to be led out as in usual manner to outside wires through posts 20.

I have illustrated and described herein a receiver having a permanent magnet in this particular form, but the present improvements are easily applicable to direct current and other types of receivers, and the coils and the magnets may be arranged otherwise suitable, when desired, as will be readily unders'tood.

A diaphragm, when cushioned as herein set forth, acquires the vibratory property, no matter whether it is elastic or not, because of the elasticity of the cushions. With a diaphragm which is fixed or substantially fixed at its peripheral edge, the case is different, as the'vibratory property is due to the elasticity of the diaphragm itself, and the vibration is almost purely drum-wise.

As the diaphragm 14 is adapted to vibrate more or less bodily (or it is stifl' enough to do so) by virtue of the cushions, it is apparent that the influence of the magnets on the whole part of the diaphragm is integrally effective, and hence the magnets and coils may be advantageously arranged to act not only on the central portion, but on the outer portion as well, thereby increasing area of action, but on the other hand, if the diaphragm is clamped at the peripheral edge, this is not the case.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and arrangement of parts and of the method of operation will be readily apparent to those skilled in the art, to which this invention appertains.

Having thus described the invention, what I claim as new, and desire to protect by Letters Patent is:

1. In a telephone receiver, a casing, a diaphragm yieldingly held therein by cushions, magnetic means arranged symmetrically so as to urge said diaphragm to vibrate integrally in the intended operations, and a resilient washer pressing the central portion of the diaphragm against the magnetic force of said means.

2. In a telephone receiver, a casing, a diaphragm cushioned at the front, back and peripheral edge thereof by soft washers or cushions under pressure in the casing, a plurality of electro-magnets arranged to act symmetrically on the diaphragm, and permanent magnets acting directly at the center and cooperatively with said electro-magnets at the outer portion on the diaphragm.

3. In a telephone receiver, a receiver housing, a casing comprising a double flanged cup and aring cover clamped thereto within said housing, a diaphragm held. between cushions under pressure in the casing, and a yielding lining disposed over the peripheral edge of the diaphragm.

4. In a telephone receiver, the combination with a casing, a vibratory body, and magnetic means; of a pad disposed over the peripheral edge of the vibratory body, and a pliable washer at the central portion of the said vibratory body for separating the said body from the magnetic means against the magnetic force.

5. In a telephone receiver, the combination with a casing, a vibrator and magnetic means; of a yielding cushion disposed at the peripheral front portion of said vi brator, and a resilient Washer at the back central portion thereof, holding said vibrator therebetween under pressure, so as to allow said vibrator to vibrate at the peripheral portion thereof under the influence of said magnetic means.

6. In a telephone receiver, the combination with a casing, a diaphragm or other vibrator and magnetic means; of elastic cushions disposed at the front and side of said vibrator, and a resilient washer disposed at the central back portion of the same, so as to allow said vibrator to vibrate substantially bodily under the influence of said magnetic means.

7. In a telephone apparatus, a casing, a vibratory plate, a yielding mounting for said plate embedding the peripheral edge thereof and holding the same under pressure in the casing, and a central washer of elastic material limiting the vibration of the plate.

8. In a telephone receiver, a mounting for a vibratory plate, comprising washers or cushions of yielding material disposed around the peripheral edge portion of said plate forming a collar, and a central washer of elastic material, as herein set forth.

In testimony whereof I affix my signature in presence of two subscribing witnesses.

- NAHO TANNAKA. Witnesses:

MIDORI ISHIHARA, James F. I. BURGESS.

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