JPH0962208A - Display flap drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a display flap driving device in the small size by supporting a rotary magnet and a flap support stand by a shaft in a posture in parallel to the axis of an exciting coil. SOLUTION: A rotary magnet 15 is supported by a shaft 16 supported in a posture in parallel to the axis of an exciting coil 11. The shaft 16 is supported with leg parts 11B arranged so as to protrude from an insulating bobbin 11A round which the exciting coil 11 is wound. A driving arm 17 is installed on the rotary magnet 15, and integrally rotates with the rotary magnet 15. A pin 18 is protrusively arranged on the turn idle end of the driving arm 17. The pin 18 engages with a long hole 19A formed in a flap driving arm 19, and the flap driving arm 19 is driven turningly in a turning angle range of about 90 degrees by this engagement. The flap driving arm 19 is integrally connected to a flap support stand 20 by a shaft cylinder 21. As a result, the flap support stand 20 turns in a posture overturned by 90 degrees from a horizontal posture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display flap drive device that can be used in, for example, a large digital display timepiece for a wall surface.

[0002]

2. Description of the Related Art The applicant of the present application, as disclosed in Japanese Utility Model Publication No. 1-28548, magnetizes an N-S pole facing an annular permanent magnet by 180.degree. A structure in which one magnetic pole is closely opposed to each other, and the direction of the current flowing through the exciting coil is reversed in the normal and reverse directions to rotate the annular permanent magnet, and the turning power is used to rotate the flap within a rotation range of 90 °. Has proposed a display flap drive device.

[0003]

The drive unit for a display device proposed above has a drawback that the driving efficiency is poor because the magnetic flux of the exciting coil uses only one magnetic pole of the coil.
That is, there is a drawback that the drive current for rotating the flap is relatively large and the current consumption is large. To eliminate this drawback, the magnetic flux generated from the exciting coil may be formed in a closed loop, and the permanent magnet may be arranged in this closed loop. Such a technical idea is a known technique as disclosed in, for example, Japanese Utility Model Publication No. 1-43744. FIG. 3 shows a display drive device having a closed magnetic circuit structure disclosed in FIG. 6 of this publication. In the figure, 1 is a main plate forming a display surface, 2 is a window formed in the main plate 1, and a semi-cylindrical display flap 3 is provided in the window 2.
Is rotatably mounted. There are three half-cylindrical display flaps 3.
It is divided into a and 3b. One is colored in 3a, for example, the same black as the main plate 1, and the other is colored in 3b in yellow. When the black 3a faces the window 2, it is in a non-display state, and the yellow portion 3b is in the window. When it comes to 2, a yellow display is displayed on a black background and letters, numbers, etc. are drawn.

Reference numeral 4 denotes a drive device for rotating the semi-cylindrical display flap 3. This drive device 4 has an exciting coil 5
The magnetic yokes 6 and 7 magnetically coupled to the magnetic core of the exciting coil 5, the rotary magnet 8 disposed in the air gap portions of the magnetic yokes 6 and 7 facing each other, and the rotary magnet 8 are integrally formed. The drive arm 9, a pin 10 provided at the tip of the drive arm 9, and an engagement portion 3 c that engages with the pin 10 and projects from the flap 3 are provided.

According to this driving device 4, the magnetic flux generated by the exciting coil 5 forms a closed loop through the magnetic yokes 6 and 7 and the rotating magnet 8. As a result, the flap 3 can be rotationally driven by a relatively small exciting current. However, according to the configuration of this conventional technique, since the axial center direction of the exciting coil 5 is arranged in the direction orthogonal to the rotation axis of the rotating magnet 8, the number of windings of the exciting coil 5 is increased and the exciting coil is increased. If the dimension of the shaft 5 in the axial direction becomes large, the height H of the driving device 4 becomes large, which is disadvantageous.

The object of the present invention is to use the magnetic flux of the exciting coil in a closed loop to improve the driving efficiency and to take a large number of turns of the exciting coil to make it compact even if the dimension in the magnetic core direction becomes large. It is intended to provide a display flap drive device capable of

[0007]

According to the present invention, the magnetic core of the exciting coil and the axis supporting the rotary magnet are set in a parallel posture, and the rotation axis of the display flap is also parallel to the magnetic core of the exciting coil. The structure is set to. With this structure, it is possible to obtain an advantage that the height of the driving device does not become large even if the size of the exciting coil in the magnetic core direction becomes large.

[0008]

1 and 2 show an embodiment of a display flap drive device according to the present invention. Reference numeral 11 in the figure denotes an exciting coil. A first magnetic yoke 12 and a U-shaped bent magnetic yoke 13 are arranged at the axis of the exciting coil 11. A second magnetic yoke 14 is magnetically coupled to the other free end of the U-shaped magnetic yoke 13. One ends of the first magnetic yoke 12 and the second magnetic yoke 14 are bent inward, and arc-shaped first magnetic poles 12A and second magnetic poles 14A are arranged to face each other at the bent free ends.

A disk-shaped rotating magnet 15 is arranged in a space where the first magnetic pole 12A and the second magnetic pole 14A face each other. The rotary magnet 15 is rotatably supported by a shaft 16 supported in a posture parallel to the axis of the exciting coil 11. Axis 16
Is supported by a leg portion 11B provided so as to project from the insulating bobbin 11A around which the exciting coil 11 is wound. A drive arm 17 is attached to the rotary magnet 15 and rotates integrally with the rotary magnet 15. A pin 18 is provided so as to project from the free end of rotation of the drive arm 17. The pin 18 engages with a long hole 19A formed in the flap drive arm 19, and this engagement drives the flap drive arm 19 to rotate in a rotation angle range of about 90 °.

The flap drive arm 19 is integrally connected to the flap support base 20 by a shaft cylinder 21. As a result,
When the flap drive arm 19 rotates in the rotation angle range of 90 °, the flap support base 20 rotates from a horizontal posture to a 90 ° inverted posture as shown in FIG. A flap 22 is attached to the upper surface of the flap support base 20.
Therefore, the flap 22 is rotated into an upward posture and a posture in which the flap 22 is tilted by 90 ° from the upward posture. The flap support 20 is supported by a shaft 23 attached to the bobbin 11A. The shaft 23 is attached in a posture parallel to the axis of the exciting coil 11.

In the present invention, the flap drive arm 1
As shown in FIG. 2, 9 and 19 are changed by 90 °, and
9'is formed so as to project in two directions, and by using either one of them, the flap 22 can be voted at the position shown in FIG. 2 and the opposite position. In this way, by adopting a configuration in which the direction in which the flaps 22 fall can be selected, when the flaps 22 interfere with each other when the flaps 22 are arranged in, for example, a Japanese shape, the flaps 22 are rotated in the opposite directions. The interference can be eliminated by changing the setting.

[0012]

As described above, according to the present invention, the rotary magnet 15, the flap support 20 and the exciting coil 11 are arranged.
Since the structure is supported by the shafts 16 and 23 which are in a posture parallel to the shaft center of the flap 22, even if the size in the shaft center direction is slightly extended in order to increase the number of windings of the exciting coil 11, the extension of the size is made by the flap 22. There is no change in the dimension H (FIG. 1) between the wiring board 24 and the wiring board 24. Therefore, according to the display flap drive device of the present invention, the advantage that the display flap drive device having a strong driving force can be made small is obtained.

Further, according to the present invention, since the flap drive arm 19 is provided in two ways, 19 and 19 ', when the display device is constructed and the flaps of adjacent drive devices interfere with each other, the flap 22 is provided. The interference can be avoided by changing the falling direction of the.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1 viewed from the front.

FIG. 3 is a cross-sectional view for explaining a conventional technique.

[Explanation of symbols]

 11 Excitation Coil 12 First Magnetic Yoke 12A First Magnetic Pole 13 U-shaped Magnetic Yoke 14 Second Magnetic Yoke 14A Second Magnetic Pole 15 Rotating Magnet 16 Axis 17 Drive Arm 18 Pin 19 Flap Drive Arm 20 Flap Support Stand 21 Axis Tube 22 Flap 23 axis

Claims (3)

[Claims] 1. An axis of an exciting coil and an axis supporting a rotary magnet are set in parallel with each other, and a rotary axis of a flap is also set in parallel with an axis of the exciting coil. A display flap drive device characterized in that a magnetic core is arranged to face the rotating magnet by approximately 180 °, and the magnetic flux of the exciting coil is used in a closed loop. 2. A. An exciting coil wound in a direction parallel to the display surface, and B. A first magnetic yoke that is disposed so as to penetrate through the axis of the exciting coil and has a first magnetic pole formed at one end of the coil; A second magnetic pole yoke which is folded back from the other end of the first magnetic yoke in the direction of the first magnetic pole, and has a second magnetic pole at an extension end thereof which is arranged so as to face the magnetic pole; A rotating magnet rotatably supported by an axis parallel to the axis of the exciting coil in a facing gap between the first magnetic pole and the second magnetic pole; A drive arm attached to the rotating magnet; A flap that is rotatably supported by an axis that is parallel to the axis of the exciting coil and that takes two postures orthogonal to each other; A display flap drive device comprising: a flap drive arm projecting from a rotation axis of the flap, and a flap drive arm having a long hole formed therein to engage with a pin projecting from a free end portion of the drive arm. 3. The display flap drive device according to claim 2, wherein the flap drive arm is provided with two elongated holes whose major axis directions are orthogonal to each other, and a structure in which the fall position of the flap can be changed. .