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CA1049133A - Loudspeaker - Google Patents

Loudspeaker

Info

Publication number
CA1049133A
CA1049133A CA75241720A CA241720A CA1049133A CA 1049133 A CA1049133 A CA 1049133A CA 75241720 A CA75241720 A CA 75241720A CA 241720 A CA241720 A CA 241720A CA 1049133 A CA1049133 A CA 1049133A
Authority
CA
Canada
Prior art keywords
unit
enclosure
diaphragm
horn
cylindrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA75241720A
Other languages
French (fr)
Inventor
Yasusi Okamura
Kiichiro Tanaka
Takashi Takeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Application granted granted Critical
Publication of CA1049133A publication Critical patent/CA1049133A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/30Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

TITLE OF THE INVENTION:
Loudspeaker ABSTRACT OF THE DISCLOSURE:
A loudspeaker consisting of a driver or motor unit consisting of a cylindrical magnet structure, a voice coil and a domed diaphragm; an enclosure unit for receiving therein the driver or motor unit; and a horm unit attached mechanically to the opened end of the enclosure unit, the positioning or locating cylindrical section of the horn unit being snugly fitted into the enclosure unit. The assembly is much facilitated, and the driver or motor unit, the enclosure unit and the horn unit may be located and held in correctly mutually coaxially aligned relationship in a very simple manner. In one embodi-ment, a spring is loaded between the driver or motor unit and the enclosure unit so that the domed diaphragm may be restrained under the forces in excess of 1.5 kg/cm2 over which the lowest resonance frequency may be stabilized.

Description

BACKROUND OF THE INVENTION-The present invention relates to generally an improvement of the construction of a loudspeaker and more particularly a loudspeaker wherein a driver or motor unit including a domed diaphragm, an enclosure unit and a horn unit are located and held in correctly mutually coaxially aligned relationship (to be referred to as "in aligned po~ition" hereinafter in this specification for brevity), and the assembly of the horn unit with the enclosure unit may be accomplished in a simple yet very reliable manner.
When the horn, the diaphragm, voice coil and magnet structure of a loudspeaker are not mutually coaxilly aligned to each other;
that is, when the magnetic gap is not uniform, the characteristics of the loudspeaker are considerably degraded. In the assembly of the prior art loudspeakers, the components thereof are correctly located with respect to each other by means of jlgs, and assembled together with screws or bolts and nuts in such a way that the peripheral edge of the domed diaphragm may be suitably restrained. Therefore, the force restraining the peripheral edge of the domed diaphragm vary from one loud-speaker to another so that the lowest resonant frequency of the loudspeaker assembled is not satisfactorily stabilized.Furthermore, the prior art loudspeakers require a relatively large number of assembly steps. In the prior art loudspeakers, the lead wire is generally attached to the edge of the diaphragm ` while the terminal plate is attached to the frame of the loudspeaker with rivets or eyelets. As a result, the number of assembly steps is further increased with the result of the increase in cost, and the disconnection of the lead wire tends to occur very frequently.
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.. : . . . :, ' :" ' ' :' ' ', ' SUMMARY O~ THE INVENTION:
One o~ the okjects of the present invention is therefore to provide a loudspeaker wherein its component parts such as a magnet structure, diaphragm, voice coil, horn, enclosure unit and so on may be located and held in correctly mutually coaxially aligned relationship.
Another object of the present invention is to provide a lQ loudspeaker wherein its horn and enclosure units are securely : ,. . .
assembled with ea~h other in a simple manner.
A further object of the present invention is to provide a loudspeaker wherein a spring is provided in order to impart the constant restraining force to the peripheral edge of the domed diaphragm, whereby the stability of the lowest resonant fre~uency may be ensured.
A further object of the present invention is to provide a loudspeaker wherein the connection between the voice coil and the terminal plate through the lead wire may be facilitated in assembly and the disconnection of the lead wire may be prevented.
~ To the above and other ends, the!p~esent invention provides a loudspeaker wherein a driver or motor unit consisting of a magnet structure, a voice coil and a domed diaphragm is received in a cylindrical section of an enclosure unit, and a horn unit is mechanically attached to the opened end of the enclosure unit whereby the driver or motor unit, the enclosure unit and the horn unit may be located and held in correctly muta~lly coaxially aligned relationship when assembled.
In accordance with the foregoing objects there is provided -a loudspeaker comprising:
a cup-shaped enclosure unit having a closed end and a cylindrical side wall, a portion of said side wall remote from said end having a plurality of circumferential slots therein;

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4~L33 a magnetic structure disposed in said enclosure unit and secured thereto, said structure comprising magnetic material and have (i) an annular end surface and (ii) a cylindrical air gap coaxial with the side wall of said enclosure unit;
a flexible diaphragm having a circular outer ring adjacent the annular end surface of said magnetic structure;
a voice coil secured to said diaphragm and disposed within said air gap;
a horn unit having an outer cylindrical portion, a cylindrical alignment portion, and an inner cylindrical diaphragm retaining portion;
said outer portion of said horn unit having a corresponding plurality of flexible pawl parts in interlocking engagement with the slots of said enclosure unit;
the alignment portion of said horn unit having an outer diameter slightly less than the inner diameter of the wall portion of said enclosure unit, said alignment portion being disposed adjacent said wall portion;
the inner portion of said horn unit having an annular end part adjacent the circular outer ring of said diaphragm, so that said diaphragm is retained in position with the circular outer ring thereo~ disposed between the annular end surface of said ~-magnetic structure and the annular end part of said inner portion of said horn unit.

BRIEF DESCRIPTION OF THE DRAWING:
Fig. 1 is a sectional view of a first embodiment of a loudspeaker in accordance with the present invention;
Fig. 2 is an exploded, perspective view of an enclosure unit and a horn unit thereof;
Fig. 3 is a sectional view of a second embodiment of the present invention;

:, ' ' ,, ~0~ 33 : ~
Fig. 4 is a perspective view of a horn unit thereof;
Fig. 5 is a sectional view of a third embodiment of the present invention; and Fig. 6 is a graph used for the explanation of the relation-ship between the lowest resonant frequency and the magnitude of the force with which the peripheral edge o the domed diaphragm of the speaker is restrained.
Same reference numerals are used to designate similar parts throughout the figures.
DESCRIPTION OF THE PREFERRED EMBODIMEN~S:
First Embodiment, Figs. 1 and 2 In Figs. 1 and 2, there is shown the first embodiment of a loudspeaker in accordance with the present invention comp-rising, in general, a driver or motor unit~ an enclosure unit 8 and a horn unit 15. The driver or motor unit consists of a magnetic structure 1 comprising a cylindrical yoke 2 and a cylindrical center magnetic piece 3 located coaxially of the yoke 2; a domed diaphragm 5 whose peripheral edge is attached .
through a mounting ring 4 to the opened end of the yoke 2; and a voice coil 6 located in a magnetic gap 7 defined by the magn~tic structure 1 and operatively coupled to the domed diaphragm 5.
The enclosure unit 8 for enclosing therein the driver or motor unit is made of synthetic resin or nonmagnetic metal plate, and consists of a cup-shaped, small-diameter cylindrical section 9, a large-diameter cylindrical section 10 formed integral with and coaxi~ly of the small-diameter cylindrical section 9, and a substantially square mounting flange 12 extended outwardly from the opened end of the large-diameter cylindrical section 10.
34 The inner diameter and depth of the cylindrical hollow cavity of the small-diameter section 9 are so selected that the driver or "

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~ ~49~33 motor unit may be snugly fitted and recieved in the cylindrical cavity of the small-diameter cylindrical section 9. As best shown in Fig. 2,- the large-diameter section 10 is provided with a plurality of rectangular engaging slots 11 formed through the side wall thereof and equiangularly circumferentially spaced apart from each other. The large-diameter section 10 is further provided with a terminal hole 14 formed through the side wall thereof in parallel with the axis of the enclosure unit 8 for receiving 'therein a terminal 13 which in turn is electrically connected through a lead wire (not shown) to the voice coil 6.' The mounting flange 12 is provided with bolt or screw holes formed thereof at the corners thereof.
The horn unit l5 is made of synthetic resin, and has a plurality of engaging projections 16 formed integal therewith '~ ' and extended backwardly (that is, toward the enclosure unit 8) in parallel with the axis of the horn unit 15 and equiangularly ~ ' ' spaced apart from each other. The free end of each engaging projection 16 terminates l~tO à pa~l'~as bes-t`shown'~in Fig. 1 which is adapted to engage with the engaging slot 11 of the ~ ' large-diameter section 10 when the projection 16 is inserted into an engaging hole formed in the side wall of the large-diameter section 10 and communicated with the engaging slot 11 (See Fig. l). The horn unit 15 further includes a positioning or locating cylindrical section 18 formed integral with and coaxially and backwardly thereof and space apart from a throat 17 of the horn unit 15 by a suitable distancé.' The positioning section 18 is provided with a plurality of axial notches 19 eguiangularly spaced apart from each other, and has an outer diameter slightly smaller ~han the inner diameter of the cylindrical cavity of the small-diameter section 9 so that the positioning section 18 may ~e fitted therein. The horn unit further includes an equalizar ~0 e~tended forwardly from the throat 17.

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Next the mode of assembly of the driver or motor unit, the enclosure unit 8 and the horn unit 15 with the above construction will be described. In the first step the driver or motor unit consisting of the magnetic structure l and the domed diaphragm 6 is fitted into the cylindrical cavity of the small-diameter section 9 of the enclosure unit 8 from the opening end thereof.

-Thereafter, the horn unit 15 is attached to the enclosure unit 8with the positioning section 18 fitted into the extenslon of the cylindrical cavity of the small-diameter section 9 and the pawl-shaped ends of the engaging projections 16 engaged with theengaging slots 11 of the large-diameter section lO. Thus the loudspeaker is completely assembled.
Since the peripheral edge of the throat 17 of the horn unit 15 presses the peripheral edge of the domed diaphragm 5 against the mounting ring 4 on the magnetic structure l,the domed diaphragm 5 may be secu~rely retained in position. Since the cylindrical yoke 2 of the driver ~r motor unit is fitted into the cylindrical cavity of the small-diameter section 9 of the enclosure unit 8j the driver or motor unit may be easily aligned with the enclosure unit 8. Since the horn unit 15 has the positioning section 18 which is fitted into the cylindrical cavity of the small-diameter section 9 of the enclosure unit 8, the horn unit 15 may be also easily aligned with the enclosure unit 8 and the driver or motor unit when assembled. Since the positioning section 18 is provided with a plurality of notches 19, it may be resiliently pressed against the inner wall of the cylindrical cavity of the small-diameter section 9 so that the horn unit 15 may be securely aligned with the enclosure unit 8 and hence the driver or motor unit.
Second Embodiment, Figs. 3 and 4 - The second embodiment shown in Figs. 3 and 4 is substantiall~

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~ ', , . . ' ~ : ' , . : ' ~9~33 similar in construction to the~first embodiment des¢ribed~above and shown in Figs. 1 and 2 except that the driver or motor unit is held in position in the enclosure unit 8 by the positioning or locating cylindrical section 18 of the horn unit 15. That is, the positioning section 18, which is made longer as compared with the first embodiment, is interposed between the inner wall of the cylindrical cavity of the small-diameter section 9 of the enclosure unit 8 and the side wall of the cylindrical yoke 2 of the magnet structure 1 of the driver or motor unit as best shown in Fig. 3. Therefore, the outer diameter of the positioning section 18 of the horn unit 15 is slightly smaller than the inner diameter of the cylindrical cavity of the small-diameter : section 9 of the enclosure unit 8 while the inner diameter of the positioning section 18 is slightly larger than the outer diameter of the d~i~er~or motor~unit~and~hence:the~cylindrical yoke 2. :
In assembly, first the driver or motor unit is fitted into the positioning section 18 of the horn unit 15, and thereafter the enclosure unit 8 is fitted!to the horn unit 15. That is, the positioning section 18 is fitted into the cylindrical cavity of the small-diameter section 9 of the enclosure unit 8 with the pawl-shaped ends of the engaging projections 16 engaged with the engaging slots 11 of the large-diameter section lO of the :~
enclosure unit 8 as with the case of the first embodiment. Thus the loudspeaker is competely assembled with the three units .
correctly aligned. :.
The cylindrical cavity of the small-diameter section 9 of the enclosure unit 8 serves to securely hold the driver or motor unit in correctly coaxially aligned relation with the enclosure unit in the first embodiment while in the second embodimentt~the posti.~ning section 18 of the horn unit 15 serves~toshold~the -8- ~ :

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~493133 driver or motor unit in correctly aligned relationship with the enclosure unit 8. And the positioning section 18 of the horn unit 15 serves to locate and hold the horn unit 15 in correctly aligned relationship with the enclosure unit 8. Thus, the driver or motor unit, the enclosure unit 8 and the horn unit 15 may be correctly aligned with each other so that the characteristics of the loudspeaker may be remarkably stabilized.
Since the positioning section 18 is provided with a plurality of notches 19, it may be resiliently pressed against the inner wall of the cylindrical cavity of the small-diameter section 9, the more secure and stable coupling between the horn unit 15 and the enclosure unit 8 may be ensured in addition to the coupling provided by the engagement between the engaging projections 16 ;
and the engaging slots ll.
In assebly, the three units are sequentially assembled without the use of adhesive or screws so that the assembly step may be much facilitated, resulting in the considerable reauction in cost.
Third Emodiment, ~ig. 5 The third embodiment shown in Fig. 5 is substantially similar in construction to the first embodiment described above with reference to Figs. 1 and 2 except that a leaf spring 21 is loaded between the bottom of the cylindrical cavity of the small-diameter sec*ion 9 of the enclosure unit 8 and the bottom o~ the cylindrical yoke 2 of the magnet structure 1 of the driver or motor unit. The spring 21 serves to press the magnet structure 1 against the throat 17 of the horn unit 15 so that the domed diaphragm 5 may be more securely retained in position.
In general, the lowest resonant frequency may be stablized when the peripheral edge of the domed diaphragm 5 is retained stationary under the force of more than 1.5 kg/cm2.
Therefore the leaf spring 21 having strony force must be selected.
For instance, when the peripheral edge with the width of one _g_ ,. . .
.

.
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m~ ~eter of the domed ~aPhragm wit~ the diameter of 15 ~m is restra~ned and when the leaf spr~ng 4 ~s capaBle of imparting to thé`cylindrical ~k`e 2 ~he ~or.c`e o~:t~e;o:r~e-r of 4-:~g~.~then the peripheral edge of the domed diaphragm is restrained under the force of 7.96 kg/cm2 so that the lowest resonance frequency may be considerably stabilized. The third embodiment has a distinct advantage over the first and second embodiments in that the domed diaphragm 5 may be restrained under the constant force of the leaf`
spring 21 regardless of the dimensional errors of the parts and positional errors among thelthree-units,-,pr~duced in assembly.
Fig. 6 shows the relation between the lowest resonant frequency to in KHz plotted along the ordinate and the force in ~:
Kg imparted by the spring 21, that is, the restraining force in Kg/cm2 acting upon the peripheral edge`with the wide of one millimeter of the domed diaphragm with the diameter of 15 mm.
It is seen that the lowest resonaht frequency may be very sat- - .
isfactorily stabilized when the restraining force is in excess of 1.5 kg/cm2.! Therefore, when the leaf spring capable of im~
parting the suffic~ently great force, for instance 4 kg, to the cylindrical yoke 2 is loaded as described above so as to produce the restraining force in excess of 1.5 kg/cm2, the lowest resonant~frequency may be satis~actoriIy stabilized-even if .-,th~e~a~i;se(.*he posit~onal errors in assembly. and.. !.the~e aLe.~ :
some~dimensional~--errors in:as.s~mbly:~and~the~e~.are some,.~imen~.a sional-e~r~rs ~n the component parts.

As described abo~e, according to t~e third embodiment ..
of the present invention, the dimensional errors of the component : ~ :
parts may be satisfactorily compensated by the prov~sion of the spring between the cylindrical yoke 2 and the small~diameter ::

section 9, and tha domed diaphrapm ~ may be re~trained under the force of higher than 1.5 kg/cm2 so that the stab~lit~ of tne low-est resonant frequenc~ may ~e ensured. ~urthermoxe the as$embly step may be much facilitated, and the h~gh quality and stabllized .: : :

.. .~

~LO149~L33 characteristics of the assembled loudspeakers may be ensured.
It is to be understood that t~e spring 21 may be also used in the second embodiment and a cone type diaphragm or a flat type diaphragm may also by used, in the place of the domed diaphragm, to have the function and advantage same as the domed diaphragm does.

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Claims (5)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A loudspeaker comprising:
a cup-shaped enclosure unit having a closed end and a cylindrical side wall, a portion of said side wall remote from said end having a plurality of circumferential slots therein;
a magnetic structure disposed in said enclosure unit and secured thereto, said structure comprising magnetic material and have (i) an annular end surface and (ii) a cylindrical air gap coaxial with the side wall of said enclosure unit;
a flexible diaphragm having a circular outer ring adjacent the annular end surface of said magnetic structure;
a voice coil secured to said diaphragm and disposed within said air gap;
a horn unit having an outer cylindrical portion, a cylindrical alignment portion, and an inner cylindrical diaphragm retaining portion;
said outer portion of said horn unit having a corre-sponding plurality of flexible pawl parts in interlocking engagement with the slots of said enclosure unit;
the alignment portion of said horn unit having an outer diameter slightly less than the inner diameter of the wall portion of said enclosure unit, said alignment portion being disposed adjacent said wall portion;
the inner portion of said horn unit having an annular end part adjacent the circular outer ring of said diaphragm, so that said diaphragm is retained in position with the circular outer ring thereof disposed between the annular end surface of said magnetic structure and the annular end part of said inner portion of said horn unit.
2. The loudspeaker according to claim 1, wherein said alignment portion of said horn unit includes a plurality of longitudinal notches therein.
3. The loudspeaker according to claim 1, wherein the alignment portion of said horn unit is disposed between the side wall of said enclosure unit and said magnetic structure.
4. The loudspeaker according to claim 1, further comprising spring means disposed between said end of said enclosure unit and said magnetic structure for urging together said i. annular end surface of said magnetic structure, ii. circular outer ring of said diaphragm, and iii. annular end part of said inner portion of said horn unit.
5. The loudspeaker according to claim 4, wherein the pressure applied to said end surface, outer ring and end part by said spring means is at least 1.5 kg./cm2.
CA75241720A 1974-12-16 1975-12-15 Loudspeaker Expired CA1049133A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP15299974 1974-12-16
JP15300174 1974-12-16
JP15571774 1974-12-19

Publications (1)

Publication Number Publication Date
CA1049133A true CA1049133A (en) 1979-02-20

Family

ID=27320387

Family Applications (1)

Application Number Title Priority Date Filing Date
CA75241720A Expired CA1049133A (en) 1974-12-16 1975-12-15 Loudspeaker

Country Status (2)

Country Link
CA (1) CA1049133A (en)
DE (1) DE2556639C3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1531791A (en) * 1976-03-17 1978-11-08 Rank Organisation Ltd Transducers
DE4031742A1 (en) * 1990-10-06 1992-04-09 Nokia Unterhaltungselektronik CALOTH HIGH TONE SPEAKER

Also Published As

Publication number Publication date
DE2556639B2 (en) 1979-02-22
DE2556639C3 (en) 1979-10-11
DE2556639A1 (en) 1976-06-24

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