US 1615028 A
Description (OCR text may contain errors)
, 1,615,028, Jan 18 1927' H. MoRsER EARPIECE FOR SOUND RECEIVERS Filed Dec. 1s, 1925 l I *B1 u /NvENro- Il 3% 5% vw Patented Jan. 18, '1927.
UNITED NSTATES PATENT OFFICE.
HARRY MORSER, 0F LONDON, ENGLAND, ASSIGNOR TO HARRY MORSER 8a COMPANY (WIRELESS) LIMITED, OF LONDON, ENGLAND, A BRITSH COMPANY.
EARPIECE FOR SOUND RECEIVERS.
Application filed December 16, 1925, Serial No.
This invention is for improvements in or relating to ear-pieces for telephones and the like and has for its object to provide an earpiece which shall be more efiicient than those at present in use. The usual ear-piece at present employed presses upon the ear and by this means tends to confuse the hearing.
According to the present invention the ear-piece has on that side which is to be towards the eai a forwardly projecting rim of such proportions as to receive the whole ear so that when the ear-piece is pressed over the ear the pressure of the contact edge of the said rim is received on the bony part of the head surrounding the ear instead of on the ear itself.
Within the aforesaid rim and situated far enough back from the contact edge to allow free accommodation for the ear, a partition may be provided having in it one or more openings, for example a central opening, to permit the soundswaves to pass through but otherwise closing, on that side` remote from the said contact edge, the cavity provided by the said rim.
The forwardly projecting rim may be made deeper, as measured from the contact edge to the position to be occupied by the diaphragm, at that side which is int-ended to lie behind the ear than at the other, so that the diaphragm may lie approximately parallel to the general plane of the ear when the receiver is in use. The aforesaid partition preferably follows the depth contour of the forwardly projecting rim so that it lies obliquely to the plane of the contact edge of the rim.
In the accompanying drawings which illustrate one method of carrying out this invention Figure 1 is a perspective view of the earpiece viewed from the front and somewhat from the left;
Figure 2 is a perspective view of the earpiece viewed from the front and somewhat from the right;
Figure 3 is a horizontal transverse section through the ear-piece on the line 3-3 of Figure 1;
Figure 4 is a perspective view of a inodified form of ear-piece viewed from the front and somewhat from the right, and
Figure 5 is a transverse section through the ear-piece on the line 5--5 of Figure 4.
75,839, and in Great Britain December 15, 1924.
Lik-e reference letters indicate like parts throughout the drawings.
The ear-piece may be moulded of eboiiite and has a back portion A adapted to be secured by screwing or otherwiseto the receiver, the diaphragm of the receiver being intended to he accommodated within. the recess A1 (Figure 3) of the said baclr portion. This baclr portion is covered by a plate B having a central opening B1, and projecting forwardly from this is a rim C. One side of the rim (the rightshand side as seen in Figures l-S) is made of greater depth than the other so that the plate B constitutes a diaphragm at the back of the cavity provided by the rim, butk which lies obliquely to the contact edge D of the rim as it fol* lows the depth contour of the rim. The forward -edge of the rim is turned over to provide a contact surface of considerable width so that the edge of the rim shall not cut when pressed against the head of the user.
The contact edge of the rim, as seen in face View, is oval, the axis of greater length being intended to lie in a vertical position when the receiver is in use, and a line bisecting the rim at the two points of least and greatest forward projection respectively, lies approximately at right-angles to this axis of greater length.
When using this ear-piece the portion of the rim which projects forwardly a greater distance than the other is intended to lie behind the ear, and the whole mouth of the rim is sufficiently large to accommodate the entire ear, part of which may lie behind the overhanging contact edge D.
It is found that this ear-piece lpressing as it does against the bony part of the head round the ear instead of upon the ear itself has considerable advantages (a) it can be used for long periods of time without any inconvenience or discomfort, (o) blood noises in the head are not conveyed to the receiver so that better hearing is obtained; (c) it closes no part of the ear and so the hearing is improved; (d) the open space between the ear-druin and diaphragm, constituted by the cavity enclosed within the rim, is productive of good accoustics; (e) the seal effected between the contact edge pressing evenly against the head shuts out all exterior sounds.
In some cases it may be preferred to have the projecting rim so constructed that it stands out an equal distance all round the back plate or diaphragm. Such a construction is shown in Figures l and 5 Where the partition E is shown as lying in a plane parallel with the Contact edge F o1 the rim. The litting at the hack ot the ear-piece in this case Would he arranged to he secured to the receiverI in such Way that the receiver diaphragm would lie parallel to the partition.
The ear-pieces described in this invention may be employed tor any purpose necessitating a vibrating diaphragm for sound reproduction.
I claim 1. An ear piece tor sound receivers comprising a rigid hase portion having means for attaching the ear piece to a receiver, a perforated diaphragm attached to said hase portion, a rigid flange springing from and substantially normal to the surface of the diaphragm and encircling the perforation therein, said flange having a marginal inturned portion constituting a rigid headrest, the opening defined by the inner edge of said inturned portion having a sullicient areato permit the passage therethrough of the ear of the user, and said flange, with its inturned portion enclosing, together With the diaphraom, a space large enough to freely receive the ear and to act as a sound chamber.
2. A device according to claim l in which said inturned portion is formed at an angle to said diaphragm.
3. A device according to claim l in Which said inturned portion is ot' suilicient Width to form a hearing surface, said interned portion carrying a further portion which is inturned toward said diaphragm.
In testimony whereof I aiix my signature.