JPS59221200A - Speaker - Google Patents

Abstract

PURPOSE:To attain excellent acoustic reproduction by forming a part extending from a center opening of a diaphragm to a prescribed height in the same curvature and fitting a dust cap to a prescribed position within the height so as to adhere uniformly the dust cap. CONSTITUTION:A cone shaped diaphragm 14 is formed so as to have the same curvature from the central opening fitted with a voice coil to the prescribed height H (diameter D). Further, the part up to an external circumference part being a fitting part of a frame 17 is formed to have a different curvature. The dust cap 16 is fitted to a prescribed position within the height H by means of an adhesive or the like. In fitting the dust cap 16 to the diaphragm 14 formed in this way, the dust cap 16 is adhered with the diaphragm 14 without gap by fixing the dust cap 16 with the adhesive at a position within the height H. The diaphragm 14 attains excellently acoustic reproduction without causing the leakage of air or vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a speaker, and particularly to the structure of a diaphragm.

(Purpose) The present invention has a structure in which the outer periphery of the medium heat part is formed with different curvatures, for example, the outer periphery is formed in a rectangular shape, and the attachment to the frame has parts of different lengths. Attach the damage 1~cap to the right diaphragm with adhesive, etc. (=i l)
When the cap and the diaphragm are installed, the cap and the diaphragm can be brought into close contact with each other uniformly around the entire circumference without creating any gaps.
The purpose is to provide a speaker that can reproduce good sound.

(Prior Art) Fig. 1 is a longitudinal sectional side view showing a conventional direct radiation type speaker having a cone-shaped diaphragm. In the figure, 1 is a frame with a circular external shape, and 2 is a voice coil at one end. 3, a diaphragm whose other end is connected to the outer periphery of the frame 1 via an edge 4; 5, a damper that supports the diaphragm 1; 6, a center pole; 7, a yoke; 8, a magnet 1;
~． Reference numeral 9 indicates a magnetic gap, and reference numeral 10 indicates a circular container fixed to the medium heat portion of the diaphragm 2 with adhesive or the like.

In conventional speakers configured in this way,
Since the diaphragm 2 is formed in a conical shape with perfect axis symmetry, the dust cap 10 attached to the diaphragm 2 with an adhesive or the like is fixed uniformly over the entire circumference of the diaphragm 2. It is now possible to

On the other hand, as shown in FIG.
If you take a diaphragm 12 that has parts with different installation lengths ("J' + J"), which part of the diaphragm 12 and the frame 11 are attached (= J relation), the center opening of the diaphragm 12 Therefore, the distance between point A on the opposite side and point B on the diagonal of the frame 11 is f.
;i l:J distance is Tatsumi, that is, the relationship is C)-Ag0-B.

Therefore, along with this, the diaphragm 12 is
In order to correct the difference in distance between uni, 〇-△, and OB,
It is necessary to set and integrally form curvatures from the medium heat opening to the outer periphery so that the curvatures are different from each other, that is, O-Δ> and O-B.

Therefore, when attaching the circular dust cap 13 to the medium heat section of the diaphragm 12 formed as described above, the dust cap 13 is in close contact between O and A where the curvature is large;
Between 0 and 8, where the curvature is small, the gap 13 must be attached to the diaphragm 12 in a state that it is floating above it, so the gap 13 to the last 1 must be attached uniformly over the entire circumference of the diaphragm 12. This may cause the diaphragm 12 to adhere, causing air leaks, bulges, etc.

Also, the diaphragm 12 is strained and distorted at the adhesive part of the cap 13, and the voice coil attached to the diaphragm 12 becomes symmetrical with respect to the rental ball, causing a predetermined magnetic pitch.・Hold the knob 1qf, diaphragm 12
The downside of the i35 is that it cannot be driven accurately, and you may not want good sound reproduction.

(Embodiment of the Invention) The present invention has been made in view of the above-mentioned drawbacks, and will be described in detail below based on an embodiment shown in the drawings.

Figure 4 is a northern sectional view showing the main parts of the speaker according to the present invention, with the T81 diaphragm and dust cap removed ();
FIG. 5 is an explanatory diagram when forming a predetermined curvature on the diaphragm shown in FIG. 4.

J3 in FIG.
A cone-shaped sliding plate 14 having a length relationship of '. curvature and take frame 17 ahead of it.''
) is formed to have a different curvature up to the outer periphery, so that the screw 1-kitotub 1G can be removed at a predetermined position within this height l-1 using a grating, etc. It's Nishide.

Now, to explain the shape of the diaphragm 14 in more detail, as shown in FIG. 5, the central opening 1 of the diaphragm 14!
) (diameter d) to form a predetermined curvature up to the height between
A point P is set at an arbitrary position on the radius d, and a circular arc with a flat diameter R1 is drawn at a point R (11 heights) from a point Q on the diameter d, centering on this PIjλ. Next, the frontage 1 of this diaphragm 14 is
5 to frame '17, the radius R is set to include one point B' of the attachment point of the outer periphery located at the height I+'.
Find the center of the circle 2 on the straight line connecting points P-R and find the arc R-
8', an arcuate cone composed of two different curvatures will be obtained between O' and [3'.

That is, point R is the point of contact between the arc of radius R1 and the arc of radius R2.

If we calculate the radius R2 by dividing the radius R2 to the position A', ·B' at all B' positions sequentially from O'-8' to 0'-Δ', It is possible to form a diaphragm 14 having the same curvature up to the height, and having different curvatures beyond this point up to the outer periphery.

Therefore, when removing the cap 1G from the diaphragm 14 formed as above, put it within the height 1-1 and fix it with adhesive, then the damage 1-kitotsub 1G will be If the diaphragm 14 is bonded without any gaps between the parts, the diaphragm 14 may cause air leaks or chatter.
Good sound reproduction is possible.

(Effects) As described above, the speaker according to the present invention has a diaphragm provided with a diaphragm having different curvatures from the middle flame opening to the outer periphery. The shaft was formed to have the same curvature up to the height of , and the diaphragm was installed at a predetermined position within this height. When removing the X tab (=J), the cap can be evenly bonded to the diaphragm over the entire circumference without any gaps between the diaphragm and the diaphragm. It has features such as being able to accurately drive while maintaining a predetermined magnetic force V-shaped without causing a magnetic force, and also allowing good sound reproduction.

[Brief explanation of the drawing]

Fig. 1 shows a conventional speaker in a vertical cross-sectional side view, Fig. 2 shows a plan view of a diaphragm with a rectangular frame when it is taken out ( ), and Fig. 3 shows a diaphragm with a rectangular frame. Figure 4 is a partial view of the diaphragm and the cap removal (P0) of the speaker according to the present invention. 'G: A main part gJi plane view showing the J state, and FIG. 14...Diaphragm, 3...Voice=1il, 6...Center ball, 7...Yoke, 8...Magnets 1~.10.13.
16... Das t ~ Ki 1/Tsubu. Patent Applicant Nippon Pictor Co., Ltd. Representative Shinji
-・Part 1 Figure 2 Figure a'54 Item 5 Figure 5

Claims (1)

[Claims] J has different curvatures from the middle flame opening to the outer periphery ().
:In a speaker having a diaphragm composed of
A speaker characterized in that the diaphragm is formed to have the same curvature up to a predetermined height from the medium-heat opening of the diaphragm, and a jigs and tabs are attached at predetermined positions within this height.