JPS6130011A - Silent solenoid and braille points display mechanism - Google Patents

Abstract

PURPOSE:To lower impulsive sound by providing a buffer member which alleviates impulsive noisy sound between movable iron core and yoke in a solenoid which acquires a stroke of constant displacement by electromagnetically attracting a movable iron core. CONSTITUTION:In a silent solenoid which acquires a constant stroke displacement through conversion of an electrical input, the magnetic pole end portion of yoke 10 located at the axial center of yoke 2 is formed in such a manner as holding the iron core from external circumference of iron core 1 during the attracting operation and with the iron core being held caused to have the U- shaped end surface in the manner of forming a strict magnetic circuit. A rubber member 11 for buffering impact is loaded to a deep area of the magnetic pole 10 of the U-shaped yoke with a means such as the bonding. While the iron core 1 of magnetic circuit is attracted through application to an excitation coil 4, the rubber member 11 suppresses generation of impulsive metallic noise sound. Thereby, operation noise level as the solenoid can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silenced solenoid that converts electrical input to obtain a constant stroke displacement.

A relatively small solenoid comprising a magnetic circuit formed from a cylindrical yoke, iron core, etc., and a coil for exciting the circuit,
It is prized for use in various control devices because it easily converts electrical input into binary motion displacement.

Usually, the mechanical displacement (hereinafter simply stroke) of the transformation is
The movable iron core is operated by electromagnetic attractive force, but there are self-holding types with built-in magnets that do not require electricity during operation, and non-self-holding types that take out the stroke depending on the presence or absence of excitation input. However, regardless of whether the solenoid is of the self-holding type or the non-self-holding type, the solenoid operates with a collision noise during the movable core suction operation.

However, since a Braille display device that uses a large number of solenoids is installed and used in homes, offices, etc., the collision noise when the device is driven cannot be ignored, and it is necessary to reduce the operating noise of the solenoids. requested.

[Conventional technology and problems to be solved] Figure 3 (a)
Figures 1 and 2 are cross-sectional views illustrating a conventional self-holding solenoid.

The configuration and operation overview of the solenoid will be explained according to the diagram.

(a) In the figure, 1 is an iron core made of electromagnetic soft iron.

2 is a cylindrical magnetic circuit forming yoke, 3 is a yoke 2
4 is an excitation coil installed inside the yoke 2, and 5 is a yoke magnetic pole located at the yoke 2° yoke magnetic pole 3. and a magnet inserted into a closed magnetic circuit consisting of an iron core 1.

The figure (A) shows a state in which the yoke magnetic pole 3 and the opposing iron core 1 are magnetically attracted and held to each other by the magnet 5.

(B) The figure shows the core and yoke in which the core 1 in the suction and holding state shown in figure (A) is released by the tension of the spring whose other end is fixed to the device housing side to which the solenoid (not shown) is attached, and the core 1 is pulled out forward. This is a state in which a gap 6 is formed between the magnetic poles.

The solenoid closes the gap 6 by energizing (energizing) input to the coil 4 which energizes the core attraction force that overcomes the spring tension with respect to the iron core 1 in the state shown in (B), for example.
b) The core suction is maintained as shown in the figure. However, since the magnet 5 exists in the iron core holding state, the state is maintained even if the coil excitation is cut off. That is, the stroke displacement of the core operation from Figure (B) to Figure (B) is obtained and the displacement is maintained.

Furthermore, to restore the stroke displacement from Figure (A) to Figure (B), if an excitation input in the opposite direction to the magnetization direction of the magnet 5 is applied, the iron core 1 will be restored by the spring tension.

The problem with the conventional solenoid is that during excitation operation, the movable iron core 1 collides with the yoke pole end face 7, causing noise.

Particularly in a Braille display device or the like that uses a large number of solenoids, the collision sound becomes intolerable noise, and measures must be taken to reduce it.

[Means for solving problems]

The above problem can be solved by inserting a shock absorbing member (buffer member) between the movable iron core and the yoke according to the present invention.

[For production]

In the solenoid of the present invention, a shock absorbing member is inserted between the movable core and the yoke magnetic pole end 7 that is in contact with the core to reduce the shock noise when the core operates, so that the conventional shock noise is significantly reduced. .

〔Example〕

FIGS. 1A and 1B are vertical sectional views including the solenoid shaft of nine embodiments of the solenoid of the present invention. Among the reference numbers attached to the main parts of the solenoid structure, the same numbers are attached to the same constituent members compared to the constituent members of the conventional solenoid, in order to make the gist of the present invention clear.

Figure (a) shows the movable iron core l of the magnetic circuit in a magnetically attracted state by energizing the exciting coil 4, and figure (b) shows the exciting coil 4 with the iron core 1 pulled forward by a coil spring (not shown). This is the state when no power is applied.

In the figure, reference numeral 10 denotes the yoke magnetic tip located at the axis of the yoke 2. This end is shaped to hold the iron core from the outside of the iron core during suction operation, and is in close magnetic contact with the held iron core. The end face is U-shaped so that a target circuit is formed. 1) is a rubber member for cushioning impact attached to the inner part of the U-shaped yoke magnetic pole by means of adhesive or the like. In other words, it is a buffer member that does not generate the sound of metal colliding with the yoke magnetic pole 10 when the iron core 1 is attracted from the state shown in FIG. 2 (B) to the state shown in FIG.

The solenoid of the present invention, in which such a buffer member is inserted, is configured to soften (mute) the sound of metal collisions, thereby reducing operating noise.

FIG. 2 is a side sectional view of another embodiment of the main part of the present invention in which the noise-reducing solenoid described in detail above is applied to a Braille display mechanism.

Braille display requires six solenoids to display unit sounds, but one diagram only shows the drive mechanism for the unit dots.

In the figure, 15 is a silence type solenoid (Fig. 1).

Reference numeral 16 indicates a display panel of a display mechanism device for assembling the silent solenoid 15, 17 indicates a stopper that supports a Braille pin attached to the bottom plate (device housing) side of the display unit, and 18 indicates a Braille display that slidably holds the Braille pin. The bearing portion 19 of the pin is the aforementioned Braille pin, one end of the pin is connected to the movable iron core of the silencer solenoid, and the other end 20 is connected to the display panel 16 from the inner surface of the through hole 21.
It is designed to protrude toward the front side. 23 is a connecting link between the movable core 1 and the Braille pin, and 24 is a tension spring that always urges the movable core in one direction, one end of which is fixed to the device housing side and the other end of which is connected to the link 23 of the movable core 1. be.

The muffled solenoid 15 causes the pin dot to stroke to control the position of the pin end 20 as shown in the figure, in which it protrudes from the surface of display 1) or not (see the position indicated by the dashed line in the figure).

Said operating stroke is indicated by the gap 25 between the stop 17 and the illustrated position of the braille pin. Since the gap distance is required to be approximately 1 to 2 mm, the solenoid core 1 used has a stroke of equivalent displacement.

Although the above-mentioned embodiment has been described by exemplifying a solenoid with a built-in magnet, the present invention can of course be applied to a non-self-holding type muffling solenoid that does not have a built-in magnet.

〔Effect of the invention〕

As described above, the sound-muffling solenoid of the present invention and the braille display mechanism using the same have the remarkable effect of significantly reducing impact noise during operation.

[Brief explanation of drawings]

FIG. 1A and FIG. 1B are cross-sectional views of an embodiment of a silence type solenoid. Figure (A) is a sectional view showing the position of the core during core suction operation, and Figure (B) is a sectional view showing the position of the core when it is not energized. FIG. 2 is a side sectional view showing another embodiment of the present invention in which the silence type solenoid of FIG. 1 is applied to a Braille display mechanism. FIGS. 3A and 3B are cross-sectional views illustrating a conventional self-holding solenoid. In the figure, ■ is the iron core, and 2 is the yoke. 3 is the yoke magnetic pole, 4 is the excitation coil. 5 is a magnet 1) is a buffer member. 15 is a silence type solenoid. 16 is the Braille display panel, and 23 is the iron core connection link. 25 is a Braille pin. 't-1 town ¥-2tJ

Claims (3)

[Claims] (1) A solenoid that obtains a constant displacement stroke by electromagnetically attracting a movable core constituting a magnetic circuit, characterized by being equipped with a buffer member that alleviates the sound of collision between the movable core and the yoke. Silent solenoid. (2) The noise-reducing solenoid according to claim 1, characterized in that it is a movable core holding type magnetic circuit that includes a magnet that holds the movable core during suction operation. (3) A braille display mechanism characterized by a structure in which a braille pin whose one end is connected to a one-way tension spring is actuated by a silence type solenoid according to claim 1.