US1821529A

US1821529A - Acoustic device provided with vibratile diaphragms

Info

Publication number: US1821529A
Application number: US281968A
Authority: US
Inventors: Spencer Kenneth Sebasti Samuel
Original assignee: GOMER H REES
Current assignee: GOMER H REES
Priority date: 1927-06-15
Filing date: 1928-05-31
Publication date: 1931-09-01
Anticipated expiration: 1948-09-01
Also published as: GB297139A

Description

P 1, 1931- K. s. s. SPENCER 1,821,529

ACOUSTIC DEVICE PROVIDED WITH VIBRATILE DIAPHRAGMS Filed May 51, 1928 2 Sheets-Sheet 1 A FIGJ.

INVENTOR.

P v1, 9 K. s. s. SPENCER ,821,529

ACOUSTIC DEVICE PROVIDED WITH VIBRATILE DIAPHRAGMS Filed lay 31. 1928 2 Sheets-Sheet 2 mum KENNETH SEbasrrmu Smvwn, SPc-wcnt,

' ,I'nvenwn Patented Sept. 1, 1931' PATENT OF F ICE xmmsmaman Loous'nc nxv ca raovrnan wrrn maa'rxm nmmons I Lppllution fled la, 81, 1928, Serial at. 281,868, and in Great Britain June it, 192?.

This invention relates to loud speakers em ploying cone diaphragms of the direct act 111 type.

The distortion of various frequencies out the musical range and blasting are mainiy" attributed to the nature and arrangement of the diaphragm and although the perform ance of loud ,speakershas been very greatly improved within recent years, the best re sults are obtained only by comparatively expensive means and devices which are often inconveniently large for ordinary purposes! The object of the resent invention is to provide a loudspea er with a diaphragm structure or arrangement which is convenient to use and gives clear undistorted duction.

To attain this object use is made p rality of conical dia hragms of the direct acting type and of ifierent dimensions shape, so mounted and actuated that undesired resonant efiects are obviated. A convenient arran ment is to have two conical diaphragms o difierent angularities whose apexes are co-axial, the space between bein unenclosed. If the peripheries diap ra s be in approximately the same plane, t e loud speaker may be ve snugiy mounted within the cabinet and i desired the diaphra smay very easily be provided with a perip eral hinge member.

The invention is illustrated in the accom pa'nying drawings in which:

Fig. 1 isa front view of a loud speaker accordin to the invention,

Fig. 2 1s a sectional plan view of the loud speaker of Fig. 1,

Fig. 3 is a sectional side elevation showing schematically a modification in dim phragm structure.

Figs. 4 and 5 show in sectional side sieve tion further modifications ofthe diaphragm structure.

The sound producing element comprises a pluralit of cone diaphragms 1 and 2, which are of ifierent angularity. The are sup ported upon a bolt 6 by means 0 spac s and 5 which may conveniently be mad any light material. The bolt 6 is r secured to an armature 3 of the elect:

m an

s-which ma olimg the The eiect cal.

ent coup sion in spring r leads tothe dri J as shown 16 positioned upon a panei 11, secured a e s i Ci the cabinet eripheries l thrown" 'nd 2 to en n.

s a y free to vibrate this case it is iound advisable to'turn back the ed e the diaphragms for say half an inch from the periphery as shown in Fig. 4e.

in order regiiiate the pressure which die, the "felt pads 2 1 o 81' HUGH cam st and support heitsld passing throw Bet the panel 11. t ngs are situated. a nuts lo eositionin he diaphragms may readily eifecte "line front panel of the cabinet is provided with openings 19 through which sound waves may to emitted 'tlisi i of diaphr f The anel has also openings 18 which aiiow souno wares, generated by diaphragm have ready access o the outside air. E-

" chamber been found th e are obviated, also the IBDZOdLLiLti"). of frequencies over an extremely broad reuse is obtained with great faithfulness.

The diaphragm a e preferabiy made f stiff aper in manner, and the fe red arrange tion clamped to the front wall of the cabinet, the peripheral portion being 'sufliciently flexible to allow the effectual vibration of the diaphragms to take place, but at the same 5 time serving to cut out or prevent the setting up of transverse vibrations or blasting. I

The term conical is meant to cover not only right circular cones but shapes which are analo ous in operation.

The scbematic representation of Fig. 3 shows a modification in which instead of two, three cone diaphragms are used. The prefered angle of the third cone is clearly shown.

In all the arrangements it is preferable that the peripheries of the cones should lie in the same plane, but of course this is not essential since the main advantage is merely one of construction.

As shown in Fig. 3 the

diaphragms

21, 22

and 23 are supported on a bolt 24.- by means of s acers 25. The bolt 24 would be secured to t e armature of the driving mechanism.

The loud speaker may be mounted in a cabinet by itself, or together with the other desired wireless receiving apparatus.

What is claimed is:

1. In a loud speaker a driving element, a plurality of conical diaphragms of different angularities operatively connected to said 1 driving element, and an opening between the peripheries of said diaphragms.

2. In a loud speaker a driving element, a cone diaphragm operatively connected to said driving element, a second cone diaphragm of different angularity to said first diaphragm also operatively connected to said driving element and with its periphery in substantially the same plane as the periphery of the first said diaphragm and spaced a slight distance therefrom.

3. In a loud speaker a driving element, a plurality of conical diaphragms of different angularlties operatively connected to said drivi of sai cabinet in proximity to the peripheries of said diaphragm, a space in said wall registering with the o ening between said dia hragms, and anot or opening in said 4. In a loud speaker a driving element, a plurality of cone diaphragms of difi'erent angularlties operatively connected to said driving element, a containing cabinet, a 51-11- rality of resilient annular members carried by a wall of said cabinet, each one of said members being engaged by the periphery of one of said diaphragms, openings in said wall communicating between the outside air and the spaces between the diaphragms.

5. Ina loud speaker a driving element, a plurality of conical diaphragms of different angularities operatively connected to said driving element, a containing cabinet, 8. wall of said cabinet in proximity to the peripheries of said diaphragms and means for adelement, a containing cabinet, a wall justing the proximity of said peripheriesto said wall.

6. In a loud speaker a driving element, a plurality of cone diaphragms of different angularities operatively connected with said driving element, a containing cabinet, a plurality of resilient annular members carried by a wall of said cabinet, each one of said members bein engaged by the periphery of one of said (Iiaphragms, openings in said wall communicating between the outside air and the spaces between the diaphragms, and means for adjustin the pressure of engagement of said diapbragms on said resilient members.

7. In a loud speaker a driving element, a plurality of cone diaphragms of different angularities operatively connected with said driving element, a containing cabinet having openings'therein, a plurality of supporting members, one disposed between the peri hery of each diaphragm and the wall of sai cabinet, certain of said openings being situated in said walls between said members.

8. In a loud speaker a driving element, a plurality of coaxial conical diaphragms of different angularities connected together, a containing cabinet, resilient annular pads on a wall of said cabinet, the periphery of one of the diaphragms engaging each of said pads and means for regulating the pressure of this engagement.

9. In a loud speaker a driving element, a plurality of cone dia hragms of different angularities operative y connected to said driving element, a containing cabinet, a wall of said cabinet engaging the eri heries of said diaphragms a second wa l 0 said cabinet carrying said driving element and means for adjusting the pressure of the diaphragms on the first said wall.

10. In a loud speaker a driving element, a plurality of coaxial diaphragms of different angularities operatively connected to said driving element, an unenclosed space between the peripheries of said diaphragms and means for variably adjusting the pressures on the diaphragms.

KENNETH SEBASTIAN SAMUEL SPENCER.