JP2662866B2 - Speaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a speaker having a curved diaphragm. (Prior art and its problems) Conventionally, there has been a flat-panel loudspeaker of an all-drive type, and a loudspeaker in which an end portion is driven in parallel with a diaphragm surface to vibrate the diaphragm in a planar direction has been proposed. . For example, in Japanese Patent Application No. 61-212961, FIG.
As shown in (b) and (c), reference numeral 1 denotes a diaphragm, and the diaphragm 1 has a substantially rectangular shape as a whole, and is made of a substantially plate-shaped metal plate such as paper or aluminum or a plastic, and the like. In addition, the vibrating surface is curved. In addition, the frames 2, 2 'support the fixing portion 3 for fixing the diaphragm 1 and the diaphragm driving device 4 so as to sandwich the same. Further, one fixed end 5 of the diaphragm 1 is fixed to the fixed portion 3, and the drive end 6 of the other diaphragm 1 is connected to a case 7 constituting the diaphragm driving device 4 via a damper 8. And the driving force is transmitted. Further, the diaphragm 1 is bent at a folding point 9 near the driving end 6 so that a driving force corresponding to a sound signal of the diaphragm driving device 4 is smoothly transmitted to the diaphragm 1. Further, the diaphragm driving device 4 includes a case 7 and a magnet unit.
10, a magnetic circuit is formed by the yoke 11 and the plate 12, and the coil 13
The diaphragm 1 vibrates via the drive end 6 connected to the thirteen. The diaphragm 1 is not limited to the above-described embodiment but has a substantially rectangular shape and a curved shape as shown in FIGS. 4 (a) and 4 (b), and the drive end 6 has a planar coil shape. A coil 13 formed by bonding, embedding, etching, or the like is provided. The diaphragm driving device 4 supports a magnetic circuit including a coil 13 formed at a driving end 6 of the diaphragm 1, a magnet unit 10 and a yoke 11 so as to be sandwiched by a frame 7, and also supports the diaphragm 1. Vibration is supported via a damper 8. Then, by flowing an audio signal current through the coil 13,
The diaphragm 1 vibrates via the drive end 6 formed integrally with the coil 13. Further, a driving force is transmitted from the diaphragm driving device 4 with both ends of the diaphragm 1 as driving ends 6,
A modified shape of the diaphragm 1 has been considered. However, in these loudspeakers, if the curvature of the diaphragm 1 formed into a curve is particularly low, the displacement of the diaphragm 1 moving backward is larger than the displacement of the diaphragm 1 moving forward, so that the sound signal applied to the speaker terminal is increased. There is a problem that a sound output waveform is different from an electric input of an audio signal, and distortion occurs in the audio output. (Means for Solving the Problems) The present invention seeks to solve the above-mentioned problems, and makes the displacement of the diaphragm forward and backward equal so that the electric signal which is a sound signal can be obtained. An object of the present invention is to provide a speaker in which the relationship between the sound output waveform and the input is made linear to suppress the distortion of the sound output or provide a speaker. In order to achieve the above object, the present invention provides a driving end having a driving coil formed by bonding, embedding, etching, or the like on at least one end, and a diaphragm having a curved vibration surface. A diaphragm driving device disposed so as to sandwich the driving end at a position substantially along the diaphragm direction, wherein the diaphragm vibrates in a direction perpendicular to the driving direction of the driving end. Wherein the magnetic driving force between the diaphragm driving device and the driving end is changed according to the driving position of the driving end. As a means for changing the magnetic driving force, a notch for partially weakening the magnetic force is provided in the magnet portion of the diaphragm driving device, or a driving coil formed at the driving end of the diaphragm is provided with a rough Are provided so as to face each other. (Operation) A diaphragm driving device that drives the diaphragm is disposed at a position along the direction of the diaphragm surface, and drives the driving end of the diaphragm in a direction substantially perpendicular to the vibration direction of the diaphragm. hand,
As a result, the vibrating surface formed in a curved shape is vibrated, and sound is generated. (Example) Hereinafter, a speaker of the present invention will be described with reference to the drawings. FIGS. 1 (a) and 1 (b) are cross-sectional views showing a first example, and FIGS. It is sectional drawing which shows two Examples. FIGS. 3 and 4 show the overall configuration of the speaker of the present invention.
Since this is the same as the conventional speaker described with reference to the drawings, the same members are denoted by the same reference numerals, and description thereof will be omitted. The feature of the first embodiment of the present invention is that, as shown in FIGS. 1 (a) and 1 (b), a notch is formed in the magnet portion 15 in the diaphragm driving device 4 in order to partially weaken the magnetic force. Alternatively, a data portion 16 is formed. Thereby, as shown in FIG. 1 (a), when a current as an audio signal is input, a current flows through the coil 13 and the coil 13
Is in a magnetic field, the driving end 6 moves in the right direction in the drawing, that is, in the F direction, according to Fleming's left hand and the rule that it moves by receiving a force due to the correlation between the current and the magnetic force. Move forward (upward in the figure). On the other hand, as shown in FIG. 1 (b), when the current input to the coil 13 is in the opposite phase, the drive end 6 moves in the left direction in the figure, that is, in the B direction, and the diaphragm 1 moves rearward (FIG. Move to the middle and lower directions). However, when moving in the direction B, some of the coils 13 protrude from the range (f) having a uniform magnetic force, and
As a result, the driving force of the driving end portion 6 in the left direction in the drawing, that is, in the B direction is weakened. Therefore, the displacement moving in the F direction is equal to the displacement moving in the B direction. A feature of the second embodiment of the present invention is that, as shown in FIGS. 2 (a) and 2 (b), the coils 13 are formed so as to face each other with a coarse and dense gap at the drive end 6. Have been. Thereby, as shown in FIG. 2 (a), when a current as an audio signal is input, a current flows through the coil 13 and the coil 13
Is in a magnetic field, the driving end 6 moves in the right direction in the drawing, that is, in the F direction according to the above-mentioned Fleming's left-hand rule of moving under a force, and the diaphragm 1 moves forward (upper in the drawing). Direction). On the other hand, as shown in FIG. 2 (b), when the current input to the coil 13 is in the opposite phase, the drive end 6 moves in the left direction in the figure, that is, in the B direction, and the diaphragm 1 moves rearward (FIG. Move to the middle and lower directions). In the above-described operation, even when the coil 13 protrudes from the magnetic field (f) when moving in the direction F in the drawing (a), the driving force of the driving end 6 is not so large because the coil 13 is a rough part. Although there is no influence, when the dense portion of the coil 13 protrudes during the movement in the direction B, the driving force of the driving end portion 6 is suddenly weakened, and a kind of brake is generated. Therefore, the displacement moving in the F direction is equal to the displacement moving in the B direction. For these reasons, according to the speaker of the first embodiment or the second embodiment, the displacement moving in the F direction and the displacement moving in the B direction can be made equal. That is, it is possible to make the displacement moving forward and backward of the diaphragm equal. (Effects of the Invention) As described in detail above, according to the speaker of the present invention, the displacement of the diaphragm moving forward and backward can be made equal, and the relationship between the electrical input as a sound signal and the sound output waveform is obtained. Can be provided linearly to suppress a sound distortion.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) are cross-sectional views illustrating a speaker as a first embodiment of the present invention, and FIGS. 2 (a) and (b) are second embodiments thereof. 3 (a), 3 (b) and 3 (c) are views showing a conventional example, FIG. 3 (a) is an external view, and FIG. FIG. 4C is a cross-sectional view of a diaphragm driving device, and FIGS. 4A and 4B are views showing a conventional example. FIG. () Is a sectional view of the diaphragm driving device. DESCRIPTION OF SYMBOLS 1 ... diaphragm, 4 ... diaphragm drive device, 6 ... drive end part, 7 ... case, 8 ... damper, 11 ... yoke, 13
…… Coil, 15… Magnet, 16… Notch or taper

Claims (1)

(57) [Claims] A drive end having a drive coil formed on at least one end thereof by bonding, embedding, etching, or the like; a diaphragm having a vibrating surface formed to be curved; and a drive end having a position substantially along the diaphragm direction. A diaphragm driving device disposed so as to sandwich the portion, wherein the vibrating plate vibrates in a direction perpendicular to a driving direction of the driving end portion, wherein a magnetic force is applied to a magnet portion of the diaphragm driving device. Wherein a notch is provided to partially weaken the magnetic force, and a magnetic driving force between the diaphragm driving device and the driving end is changed according to the driving position of the driving end. 2. A drive end having a drive coil formed on at least one end thereof by bonding, embedding, etching, or the like; a diaphragm having a vibrating surface formed to be curved; and a drive end having a position substantially along the diaphragm direction. A diaphragm driving device disposed so as to sandwich the part, wherein the diaphragm vibrates in a direction perpendicular to the driving direction of the driving end, and a driving coil formed at the driving end. The magnetic driving force between the diaphragm driving device and the driving end portion is changed according to the driving position of the driving end portion. Speaker.