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4. Agent ? 105 [Phase] Japan Patent Office ? Japanese Patent Application Laid-Open No. 511207L1g0 Japanese Patent Application No. 51. (1976) 10.22 ? ? ? Japanese Patent
Application No. Sho-g u-1 ([Phase] Application Date ?, (197? ) 4. / R Examination request grade
(all three pages) Office serial number 1 cII; r, # description 1, name of invention
3. Detailed Description of the Invention The present invention relates to a speaker. In a
conventional cone speaker in W, a dust cap is used for dust protection to a voice coil in a
magnetic circuit. In addition, a sub cone having an apex angle different from the apex angle of
the main cone may be used for the purpose of raising the upper limit of the high frequency
reproduction frequency. However, in a double cone speaker using a small subcone, interference
between both the main cone and the subcone becomes a problem, and the connection in the
high-tone reproduction band is not smoothly performed, and a peak is formed on the
characteristic. The current situation is that it is generated, the frequency characteristic is
lowered, and the feeling of connecting the sub cones is not removed in the trial. The present
invention mainly aims to improve directivity characteristics and reduce distortion, and to provide
a speaker having a shell cap which acts as a dust cap and has the same function as a sub cone
without having the above-mentioned drawbacks. is there. An embodiment of the invention will be
described with reference to the drawings. FIG. 1 shows an example of the speaker according to
the present invention EndPage: 1 is a thing, 1 is a center ball, 2 is a plate, 3 is a yoke, 4 is a
magnet, 5 is a voice coil, 6 is a damper, 7 Is a shell cap and 8 is a main cone. According to the
present invention, when the depth of the main cone 8 is h and the apex angle is ?, the height is
h ? and the apex angle is e ? ? as shown in FIG. And h ? h ? ?% to be adhered to the main
cone 8 so as to satisfy the relationship. In addition, as a material of the shell cap 7, a general
cone material, a polyester film, a metal material, etc. can be used. The shell cap 7 according to
the present invention has many advantages as described below in addition to the dustproof
function similar to the dust cap used for the conventional cone speaker. Since the apex angle ?
'of the stub 7 can be reduced, the high-resonance frequency can be raised, and since it has a
rising shape starting from approximately the same dimension as the diameter of the voice coil 5,
the conventional Even if the apex angle ? 'is the same as that of the sub-cone 9, the overall
shape is smaller. The VC machined weight is suppressed to approximately X to the weight of the
conventional sub-cone 9, and the high-frequency resonance frequency is significantly increased.
In addition, the entire shell has a cylindrical shape, so the mechanical strength can be increased
because the vicinity of the bonded part is cylindrical. -1 It becomes possible to raise the highband resonance frequency more than conventional sub-cone than for these bodies. The high
frequency characteristics can be improved.
Furthermore, the directivity characteristic of a general cone speaker is mainly determined by the
aperture and depth of the cone as the main factor. 9 The directivity limit frequency seen from the
aperture of the cone decreases in inverse proportion to the effective radius of vibration However,
in the shell cap 7 according to the present invention, as apparent from FIG. 1, it is possible to
increase the limit frequency of directivity approximately twice by the fact that the effective
vibration radius is A of the conventional subcone 9 . Also, considering that the frequency at
which directivity is a problem is a frequency particularly in the high region, the shell cap 7 is
emitted from the main cone 8 because this region is a divided region of divided vibration. It is
clear that it is possible to improve directivity characteristics by synergetic effects of each other,
by acting as an equalizer (phase equalizer) of the energy to be generated. Furthermore, the
electric energy from the voice coil 5 is transmitted to the main cone 8 and the shell cap 7 by
vibrating the voice coil bobbin 10 up and down as vibrational energy, but the actual energy
component takes a form shown by a vector in FIG. As a matter of fact, if the mechanical strength
of the bonding at the central portion is increased, the strain will be reduced. In the shell cap 7
according to the present invention, since the bonding portion to the main cone 8 has a cylindrical
shape as described above, it is possible to increase the bonding strength of the central portion.
Due to the increase in the target strength, the occurrence of distortion can be suppressed as
compared with the conventional sub-cone.
4. Brief Description of the Drawings FIG. 1 is an explanatory view showing an example of a
speaker according to the present invention, and FIG. 2 is an end page 2 chart diagram showing
vibration energy components. 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Main cone, 9 ... sub cone, lO ... voice coil bobbin. Patent
Assignee Hokuto Acoustics Co., Ltd. Attorney Attorney 1) Complete and Complete Figure 1 Figure
2 EndPage: ?
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