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Description 1, title of the invention
Method of manufacturing speaker diaphragm
3. Detailed description of the invention The present invention sucks a thermoplastic synthetic
resin sheet from the inner surface of a mold by vacuum molding method and forms it into a
desired shape by suction. The present invention relates to a method of manufacturing a speaker
diaphragm having all the features. Heretofore, as shown in FIGS. 2 to 4, in order to manufacture
a diaphragm for such a loudspeaker, particularly a diaphragm for a cone type loudspeaker, a
handmade material 1 in which the thermoplastic synthetic shelving sheet 1 is cut into a plane
circle. The peripheral part of the mold is fixed to ml with the fixing tool 2 and while this manual
material 1 is lowered to the upper surface of the mold 3, it is heated and softened by the heater 4
disposed on the top of the mold 3. After that, the hand made material 1 inserted into the form 3
is softened and deformed by the heater 4 to form a substantially circular small trapezoidal shape,
but at the same time the form as n Multiple suction holes 5t made in a large number of l into the
appropriate phase of 3 through the formwork 3 from the formwork 3 accumulated in the gap T
between the hand-made material 7 and the outer peripheral surface of the formwork 3 by the
completely complete molding method Suction and exhaust the air (9 り 寥 襞 、 、 End 襞 襞 襞
Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page
Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page
Page Page Page Page Page Page) The corresponding shape closely to the adsorption of n1
Formwork 3 on the upper surface of the mold 3 by deforming Te. Next, the heater 4 is
completely stopped and the hand-made material 1 is cooled. After squeezing air is sent from the
mold 3 circle through the suction hole 5 of the mold 3, the hand base material 1 cooled is
pressed from the mold 3. Then, it is removed naturally, and a speaker vibration rJh temporary 0
as a product is obtained. The diaphragm 0, which has been built like this, has been coated with a
gump material such as vinyl acetate after molding, in order to compensate for the mechanical
weakness exhibited by the synthetic cavitation sheet material. In the process, the coating
thickness of the dumping agent tends to be uneven due to manual work, causing variations in
each product, which is not preferable because the characteristics of the speaker itself are lost in
product control, and the appearance is also unsatisfying Met. The invention here applies the
dumping agent to one or both sides of the prior sheet which has been hot-bottomed, solving the
drawbacks arising from the conventional manufacturing methods as described above, so that the
thickness of the dumping agent can be applied uniformly throughout It is an object of the
present invention to provide a method of manufacturing a speaker diaphragm which can change
the coating thickness if desired, thereby eliminating product variations and reducing the
application process of the dumping agent. Hereinafter, one embodiment of the manufacturing
method of the present invention will be described in the order of steps with reference to the
drawings. For example, polystyrene, polycarbonate, polyvinyl chloride, etc. are used as the
thermoplastic synthetic resin sheet 1 used in the present invention, and a conventional doublesided adhesive is previously produced on one side or both sides of the heat In order to apply the
dumping agent 6 uniformly, a machine or device used, for example, a rotating roller, which is
freely mounted on the upper and lower surfaces of the synthetic resin sheet, may be used.
As the dump agent 6 used here, u% J is vinyl acetate. In addition, if it is desired to partially
change the coating thickness of the dumping agent 6 as desired, for example, application of the
dumping agent 6 to the hot-chow plasticity composite sheet material sheet 1 'non-uniformly
supplying' jt ' In addition, the application thickness t-i of the dumping agent 6 can be obtained by
t-changing the rotation axis of the rotating roller with respect to the moving direction of the
thermoplastic synthetic paste 814 sheet 1. Therefore, according to the present invention, the
heat sink prior to forming! The dumping agent can be uniformly applied to one side or both sides
of the 111 town synthetic resin sheet, and even if it is desired to partially change the coating
thickness of the dumping agent, it can be easily achieved. It is possible to improve the product
variation of the speaker diaphragm and also to change the dumping agent application process
from the manual work after the rCd product production to the conventional mechanical
application-it is also economical in 9 hours As a result, it is possible to achieve labor saving and
improve the power consumption process as a whole. Although the above embodiment is an
explanation of the diaphragm of the speaker, it can also be applied to the diaphragm of a
4. Brief description of the drawings Fig. 1 is a cutaway sectional view showing one embodiment
of the thermal uJ flexible synthetic siJ 1m sheet constituting the present invention, and a
description showing the manufacturing process in Fig. 2 to Fig. 4 similarly. EndPage: A half
sectional view of 2. 1 ······· Thermoplastic synthetic resin sheet 1
······························································································ Heaters 5 ...... suction holes 6 ...... damping agent T
...... clearance O ...... vibrator applicant carbonochloridate Ionia Co. EndPage: 3 procedures
amendments (spontaneous ) Patent Secretary General Katayama Ishibe 1 the display of the case
1959 patent application No. 1421348 3, who corrects jl? Related patent applicants I 1 place 1
Tokyo 4 Meguro-ku 1-chome Tokyo Meguro-ku, Agent address 2-1-1 Uchiyukicho Chiyoda-ku
Tokyo Tokyo (502) 3171 (representative Iino Building) ) Name (7; o +) 9) -±± (Tatsuno Hideo
18, contents of correction as indicated in the attached sheet) correction book (Japanese Patent
Application No. 51-142848) (1) machine on page 3, line 10 Correct "weakness" as "low
internal loss". (2) Correct the entire "thermoplastic synthetic resin sheet" which is described as
"the heat-sensitive synthetic resin sheet" in the specification, page 4, lines 14 to 15. (3) Correct
the fact that "vinyl acetate" is on the specification, page 5, lines 5 to 6, as "ethylene vinyl acetate
copolymer". Patent Assignee Pioneer Co., Ltd. Representative Hideo Kanno. ′6..4
EndPage: 4
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