JP2001157141A - Moment-generating means, and display device using the moment generating means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate influence due to expansion operation duet to the weight and position of center of gravity of an object to be expanded, without having to increase the weight and external form of the device as a whole so-called retract type various devices. SOLUTION: This moment generating means 4 adding prescribed moment to a member 2 supported in a freely rotatable way, has a compression coil spring 14 and a plurality of links 15 to 17 for transmitting energizing force by the compression coil spring to the member supported freely rotatably and makes the energizing force of the compression coil spring transmitted to the member supported freely rotatably to operate as moment, in such a direction as to always chancel the moment due to the weight of the member supported in the freely rotatable way.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moment generating means for applying a moment in a predetermined direction to a rotatably supported member to assist the turning operation thereof, and the moment generating means. And a display device using the same.

[0002]

2. Description of the Related Art A so-called retractable (retractable or retractable) type device which is usually stored in a storage state due to a limitation of an installation space and is deployed and used at the time of use, for example, installed on a ceiling of an aircraft or the like. In the various devices described above, when an operation of expanding (pulling down) a retracted object by a motor is performed, the weight of the moving object, for example, a liquid crystal display (LCD) panel acts in a direction in which the weight is expanded. Therefore, the motor does not receive a load, but when the object is stored, the weight of the object directly acts as a load on the motor.

[0003] Therefore, the motor needs at least an output equivalent to the moment generated by the weight of the object.

In order to eliminate the influence of the weight of the unfolded or stored object, conventionally, an appropriate weight is provided on the opposite side of the rotation axis of the object to offset the weight of the object. However, this causes a problem that the weight of the entire apparatus is increased and the outer shape of the entire apparatus is increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has been described in relation to the so-called retract-type devices, in which the influence of the weight and the position of the center of gravity of the unfolded object on the unfolding operation is reduced.
It is an object of the present invention to eliminate the apparatus without increasing the weight or the outer shape of the entire apparatus.

[0006]

In order to solve the above problems, a moment generating means according to the present invention comprises a compression coil spring,
A plurality of links for transmitting the biasing force of the compression coil spring to the rotatably supported member, wherein the biasing force of the compression coil spring transmitted to the rotatably supported member is rotatably provided. The moment acting due to the weight of the supported member acts as a moment in such a direction as to always cancel.

Accordingly, it is possible to eliminate the influence of the weight of the rotatably supported member when rotating.

Further, in the display device using the moment generating means of the present invention, the display portion is adapted to be used by being developed from above to below, and the compression coil spring and the urging force of the compression coil spring are transmitted to the display portion. And a moment generating means having a plurality of links such that the urging force of the compression coil spring transmitted to the display unit acts as a moment in a direction that always cancels the moment due to the weight of the display unit.

Therefore, it is possible to eliminate the influence of the weight of the display unit when the display unit is rotated.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a moment generating means according to the present invention and a display device using the moment generating means. In the following embodiments, the present invention is applied to a retractable liquid crystal display device mounted on an aircraft (hereinafter simply referred to as “liquid crystal display device”).

First, the structure of the liquid crystal display device 1 will be described.

As shown in FIG. 1, the liquid crystal display device 1 is a liquid crystal display panel (hereinafter abbreviated as LCD panel) 2 which is a member (display unit) supported rotatably (deployable and retractable).
And a driving means 3 for the LCD panel 2 and a moment generating means (hereinafter referred to as a “balance mechanism”) 4 for assisting the operation of the driving means 3.

The LCD panel 2 is rotatably supported by a rotating shaft 5 and is expanded and stored by a driving means 3. When the LCD panel 2 shown in FIGS. 1 and 2 is housed, it is locked by the solenoid 6 fitted into the recess provided at one end so as to maintain the housed state.

The driving means 3 is, as shown in FIGS. 1 and 4, a motor 7, a driving wheel 9 fixedly mounted on a rotating shaft 8 of the motor 7, and a rotating shaft 5 of the LCD panel 2. The driving force due to the rotation of the fixed driven wheel 10 and the motor 7 is L.
A link 11 for connecting the driving wheel 9 and the driven wheel 10 for transmitting to the rotating shaft of the CD panel 2, and a brake 12 attached to the rotating shaft 8 for regulating or stopping the rotation of the rotating shaft 8 Consisting of

As will be described later, the balance mechanism 4 cancels the influence of the weight of the LCD panel 2 on the driving means 3, in other words, generates a moment in the opposite direction to the moment generated by the weight of the LCD panel 2. As shown in FIGS. 1 to 3, the slide member 13, the compression coil spring 14, the first link 15, the second link 16, and the connecting plate (third plate) are provided. 17).

The sliding member 13 has a fixed portion 18 and a sliding portion 19 which is guided by a through hole 18a of the fixed portion 18 and is slidable. One end of the sliding portion 19 is connected to the second link 16 in a state where the second link 16 is rotatable with respect to the sliding portion 19. Then, the compression coil spring 14 is appropriately compressed in a portion 19b between the flange 19a formed on one end of the sliding portion 19 (the side connected to the second link 16) and the fixed portion 18. It is fitted outside.

One end of the first link 15 is rotatably supported by a frame or the like of the liquid crystal display device 1 (not shown), and the other end is freely rotatable with the second link 16 and the connecting plate 17. It is connected to.

The second link 16 has a substantially U-shape. As described above, one end of the second link 16 is rotatably connected to the sliding portion 19 of the slide member, and the other end of the second link 16 is rotatable. Are connected to the connecting plate 17 so as to sandwich the first link 15 from both sides and to be rotatable.

A connecting plate 17 whose one end is rotatably connected to the first link 15 and the second link 16 is rotatable to a portion of the LCD panel 2 slightly away from the rotating shaft 5. It is connected in a state.

Therefore, the urging force of the compression coil spring 14 is
The connecting portion 20 between the sliding portion 19 of the sliding member 13 and the second link is defined as a point of force A, the shaft support 21 to which the first link 15 is fixed is defined as a supporting point B, and the first link 15 and the second link 16 are used. And connecting portion 22 with connecting plate 17 and connecting plate 17 and L
The connection portion 23 with the CD panel 2 operates as operation points C and D.

In order to detect the unfolding state and the storage state of the LCD panel 2, respectively, the LCD panel 2 is provided in two places.
Microswitches 24 and 25 are provided which are pressed when a particular state is reached.

As shown in FIG. 1, the driving means 3 comprises:
It has an automatic storage spring 26 which is a torsion coil spring externally fitted to the rotating shaft 8 of the motor 7. This automatic storage spring 26
Are arranged so that a twist (twist) is added as the unfolding angle θ3 of the LCD panel 2 increases, and the urging force of the twist assists the operation of the motor 7 in the normal state, and the liquid crystal display device 1 When the current supply to the LCD panel 2 is stopped (in an emergency or the like), the LCD panel 2 is automatically brought into the housed state only by the urging force (torque).

Next, the operation and action of each of the above-mentioned parts accompanying the unfolding operation and the storing operation of the LCD panel 2 in the liquid crystal display device 1 will be described with reference to FIGS. 2, 3, 5 to 9.

That is, when a command to expand the LCD panel 2 is issued by an operation of the user of the liquid crystal display device 1 or the like, the lock of the LCD panel 2 by the solenoid 6 is released and the motor 6 operates. Then, the drive wheel 8 fixed to the rotating shaft 7
Driven wheel 10 connected by link 11 with the rotation of
Rotates. Then, the LCD panel 2 rotates about the rotation shaft 5 as a rotation center, and at the same time, the operation point D of the balance mechanism 4 on the LCD panel 2 side also rotates.
Of action C on the balance mechanism side 4 connected to the
Is displaced upward. Here, since the fulcrum B at one end of the first link 11 is fixed, the point of force A, which is the connection point between the second link 16 and the slide member 13, is pressed, and the sliding portion 19 is fixed. 18 to compress the compression coil spring 14. At this time, the automatic storage spring 26 also
Further twisting is applied.

Then, as shown in FIGS. 3 and 5, LC
When the D panel 2 is deployed to the normal deployment angle θ3 (approximately 102 °), the micro switch 24 is pressed and activated,
At the same time as the operation of the motor 7 is stopped, the brake 12 is operated to keep the LCD panel 2 in the deployed state.

When a storage command of the LCD panel 2 is issued by an operation of the user of the liquid crystal display device 1 or the like, the brake 12
Is released, and the motor 7 rotates in the opposite direction to that at the time of deployment, and the force point A, the fulcrum B, the action points C and D
And the other parts move in the opposite direction to the above-described unfolding state, and the LCD panel 2 presses the shaft of the solenoid 6 just before the storage position shown in FIGS.
The position of the LCD panel 2 is locked by fitting with the concave portion 2a of the panel 2. Immediately before this, the microswitch 25
Operates to stop the operation of the motor 7.

When the power supply to the liquid crystal display device 1 is stopped and the brake 12 is operating, the operation is released by using an internal capacitor (not shown). Then, the LCD panel 2 rotates and enters the stored state by the urging force of the automatic storage spring 26 to which the twist was applied when the LCD panel 2 was expanded. When the brake 12 is not actuated, the LCD panel 2 is quickly rotated by the biasing force of the automatic storage spring 26 to be in the stored state when the power supply is stopped.

Finally, the principle of the balance mechanism 4 will be described.

As shown in FIGS. 2 and 3, the balance mechanism 4 applies a force f to the point of force A by the elastic force of the compression coil spring 14.
2 at the same time, a reaction force f3 is generated at the fixed fulcrum B as a reaction of f2, and these forces of f2 and f3 are transmitted through the first link 15 and the second link 16 to leverage. Addition and amplification are performed according to the principle, and the power point A and the fulcrum B are added to an action point C that forms an approximately isosceles triangle.
A force f is applied to the action point D on the LCD panel 2 side via the connecting plate 17.
1 (= (2 × f2tan θ1) × cos θ2) to generate a rotation torque at the rotation center F of the LCD panel 2.

That is, due to the weight M (about 800 grams in the present embodiment) of the LCD panel 2 added to the center of gravity E, the center of rotation F of the rotating shaft 5 of the LCD panel 2 is given by FE
× M clockwise torque is applied. In addition, " FE "
Indicates the length from the rotation center F to the center of gravity E. Similarly, in the case of a code with an underline shown below, the length between two points indicated by the code is also indicated.

[0031] Then, F the rotation center F of the LCD panel 2
If no force is applied when the E × M torque is applied, the LCD panel 2 starts to rotate clockwise around the rotation center F, and the unfolding angle θ3 becomes 90 degrees. Stop the rotation. This means that the deployment angle θ3 is 90 °
When the angle is set to 0 ° (to accommodate the LCD panel 2), a torque of FE × M is required,
Therefore, when the balance mechanism 4 is not provided, a motor that generates a torque of FE × M or more is required in order to cause the motor to store the LCD panel 2.

Therefore, by using the balance mechanism 4 to generate a force of f1 at the point of action D and generating a counterclockwise torque of FD × M at the rotation center F of the LCD panel 2 in the same manner as described above. This is offset by the FE × M, so that the effect of the weight M of the LCD panel 2 is reduced, and the LCD panel 2 can be housed by a small motor having a small torque.

The FE × M torque is applied to the LCD panel 2
If the balance mechanism 4 is not used, a motor that generates a large torque by the motor in proportion to the weight of the LCD panel 2 is necessary. However, the balance mechanism 4 is used, and the compression coil spring 14 is used. By increasing or decreasing the generated force F2 (for example, increasing or decreasing the compression amount of the compression coil spring 14), the load on the motor 7 due to the weight of the LCD panel 2 can always be reduced.

The development angle θ3 of the LCD panel 2 is 0 °, 60
The torque due to the weight of the LCD panel 2, the torque due to the action of the balance mechanism 4, and the torque due to the automatic storage spring 26 applied to the rotation center F at the angles of ° and 102 ° are shown in FIG. In the following description, the clockwise direction and the counterclockwise direction refer to the clockwise direction and the counterclockwise direction in FIGS.

When θ3 is 0 °, the torque Mpnl given to the rotation center F by the weight of the LCD panel 2 is Mpnl = FE × M (−direction), and the torque M given to the rotation center F by the balance mechanism 4 is
bal is Mbal = FD × f1 (+ direction), and the torque Mdec applied to the rotation center F by the automatic storage spring 26 is Mdec = Mint (+ direction, Mint: torque generated when the automatic storage spring is installed). And the sum Mall of these is: Mall = Mpnl + Mbal + Mdec.

When θ3 is 60 °, the torque Mpnl given to the rotation center F by the weight of the LCD panel 2 is Mpnl = FE cos60 ° × M (−direction), and the torque given by the balance mechanism 4 to the rotation center F is as follows. M
bal is Mbal = FD cos60 ° × f1 (+ direction), and the torque Mdec applied to the rotation center F by the automatic storage spring 26 is Mdec = Mint + (k × 60) (+ direction, k: The total Mall of these is Mall = Mpnl + Mbal + Mdec. For convenience, the moment in the clockwise direction in FIGS. 2 and 3 is-(minus), and the moment in the counterclockwise direction is +.
(The same applies to the graphs of FIGS. 10 and 11).

When θ3 is 102 °, the torque Mpnl given to the rotation center F by the weight of the LCD panel 2 is Mpnl = FE cos102 ° × M (−direction), and the torque given by the balance mechanism 4 to the rotation center F is M
bal is Mbal = FD cos102 ° × f1 (+ direction), and the torque Mdec applied to the rotation center F by the automatic storage spring 26 is Mdec = Mint + (k × 102) (+ direction). Is Mall = Mpnl + Mbal + Mdec.

That is, as shown in FIG. 10, the torque Mpnl given to the rotation center F by the weight of the LCD panel 2 becomes maximum when the development angle θ3 is 0 °, and thereafter decreases, and the development angle θ
3 becomes zero at 90 °, and when the deployment angle θ3 is 90 ° or more, the moment increases in the opposite direction (+ direction) to the past.

Similarly, the torque Mbal applied to the rotation center F by the balance mechanism 4 depends on the weight of the LCD panel 2 and the rotation center F.
Is a moment in a direction completely opposite to the torque Mpnl applied to the motor, the expansion angle slightly increases from 0 °, and the expansion angle θ3 becomes about 1
It becomes maximum near 0 ° (substantially constant between θ3 and 0 °), and becomes zero when the development angle θ3 is approximately 84 °. After that, the moment in the opposite direction (−direction) from before is obtained. And increase.

The torque Mdec applied to the rotation center F by the automatic storage spring 26 gradually increases as the development angle θ3 increases.

Therefore, the sum Mall of these increases gradually at first, and reaches a maximum (approximately 0. 0) when the development angle θ3 is about 50 °.
31Nm), and thereafter gradually decreases as the development angle θ3 increases.

In the balance mechanism 4, between the point of force A and the point of action C on the balance mechanism 4, between the fulcrum B and the point of action C on the balance mechanism 4, the point of action C on the balance mechanism 4 side.
And the fulcrum B which change with the change of the distance between the action point D on the LCD panel 2 side and the action point D on the LCD panel 2 side and the center of rotation F, and the development angle θ3 of the LCD panel. Between the first link 15 (the line connecting the fulcrum B and the point of action C) and the direction in which the force of the compression coil spring 14 acts, and the second link 16 (the point between the point of force A and the point of action C). The angle θ1 between the connecting line) and the direction of action of the force of the compression coil spring 14 and the angle θ2 between the connecting plate 17 (the line connecting the operating point C and the operating point D) and the perpendicular are respectively shown in FIGS. 9
As shown in FIG.

For reference, it is assumed that the balance mechanism 4 is not provided. At this time, when the LCD panel development angle θ3 is 0 °, 60 °, and 102 °, the LCD panel applied to the center of rotation of the LCD panel is rotated. The torque due to weight and the torque due to the automatic storage spring are shown in FIG. 11 and below. In this case, various conditions such as the weight of each part are the same as those in the liquid crystal display device 1 except for the balance mechanism 4.

When θ3 is 0 °, the torque Mpnl given to the rotation center F by the weight of the LCD panel is Mpnl = FE × M (−direction), and the torque Mdec given to the rotation center F by the automatic storage spring 26 is , Mdec = Mint (+ direction), and the total Mall thereof is Mall = Mpnl + Mdec.

When θ3 is 60 °, the torque Mpnl given to the rotation center F by the weight of the LCD panel 2 is Mpnl = FE cos60 ° × M (−direction), and the automatic storage spring 26 gives to the rotation center F. The torque Mdec is Mdec = Mint + (k × 60) (+ direction), and the total Mall thereof is Mall = Mpnl + Mdec.

When θ3 is 102 °, the torque Mpnl given to the rotation center F by the weight of the LCD panel 2 is Mpnl = FE cos 102 ° × M (−direction), and the automatic storage spring 26 gives to the rotation center F. The torque Mdec is: Mdec = Mint + (k × 102) (+ direction), and the total Mall of these is Mall = Mpnl + Mdec.

That is, as shown in FIG. 11, the torque Mpnl given to the rotation center by the weight of the LCD panel 2 is equal to the development angle θ.
3 becomes maximum at 0 °, then decreases and becomes zero at a deployment angle θ3 of 90 °, and when the deployment angle θ3 is 90 ° or more, the moment increases in the opposite direction (+ direction) to the past. Go.

The torque M applied to the center of rotation by the automatic storage spring
dec gradually increases as the development angle θ3 increases.

Accordingly, the sum Mall of these is obtained by calculating the development angle θ
3 will increase as it increases.

From the above results and FIGS. 10 and 11, the maximum value of Mall with the balance mechanism 4 is 0.31 Nm.
However, the maximum value of Mall without the balance mechanism 4 is 1.41 Nm, which is nearly five times the above value. This Mall
Can be said to be the minimum required torque of the motor 7 to accommodate the LCD panel 2. Therefore, the required torque of the motor 7 when the balance mechanism 4 is used is approximately the same as when the balance mechanism 4 is not provided. 1/5 is fine,
It can be seen that a smaller and lighter motor 7 can be used.

As described above, in the present invention provided with the balance mechanism 4, the motor 7 used when the LCD panel 2 is deployed and stored (especially when the LCD panel 2 is stored) can be reduced in size and weight. Even when a motor having a different size and weight is used, it is only necessary to adjust the force generated by the balance mechanism 4, that is, adjust the urging force of the compression coil spring 14, and it is not necessary to change the motor 7.

Further, by using the balance mechanism 4, the size of the motor can be reduced as compared with the prior art.
The cost, weight, and power consumption of the liquid crystal display device 1 can be reduced.

Further, since the load applied to the motor 7 is substantially constant irrespective of the value of the development angle θ3 of the LCD panel 2, unevenness in the operation speed at the time of development and storage is reduced.

Further, since a small force is required when the LCD panel 2 is stored, even when power is not supplied, the motor is driven by the small spring (automatic storage spring 26) or the electric power stored in the capacitor to drive the LCD panel. Panel 2
Can be stored.

The use of the above-mentioned balance mechanism is not limited to the storage and expansion of the LCD panel in the liquid crystal display device. More generally, a device for expanding and storing various objects from above to below. For example, it can be widely used for a ceiling storage type ladder for a house.

Further, the specific shapes and structures of the respective parts shown in the above-described embodiment are merely examples for embodying the present invention.
These should not be construed as limiting the technical scope of the present invention.

[0057]

As described above, the moment generating means according to the present invention is a moment generating means for applying a predetermined moment to a rotatably supported member. A plurality of links for transmitting force to a rotatably supported member, wherein the biasing force of the compression coil spring transmitted to the rotatably supported member is rotatably supported; The moment due to the weight of the member always acts as a moment in a direction that cancels out, so that when rotating the rotatably supported member, it is possible to eliminate the influence of the weight, and with a very small force The member rotatably supported can be rotated.

A display device using the moment generating means according to the present invention is a display device using a moment generating means for applying a predetermined moment to a rotatably supported display unit. A compression coil spring that is adapted to be used by being developed from above to below and has a plurality of links for transmitting a biasing force of the compression coil spring to the display unit; and a compression coil spring transmitted to the display unit. The biasing force acts as a moment in a direction that always cancels the moment due to the weight of the display unit, so that when the display unit rotates, it is possible to eliminate the influence of the weight, and to minimize the force. When the display unit is rotated by, for example, when the display unit is driven by a motor, a small and light motor is used regardless of the weight of the display unit. It is possible to use.

According to the third aspect of the present invention, the display section is driven and rotated by the driving means, and the moment generating means acts to assist the turning operation of the display section by the driving means. The display unit can be rotated by an appropriate driving unit that generates a small force, so that the entire apparatus can be reduced in cost, weight, and power consumption.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an entire retractable liquid crystal display device mounted on an aircraft, which is an embodiment of a moment generating means and a display device using the moment generating means.

FIG. 2 is a side view at a storage position of a liquid crystal display panel.

FIG. 3 is a side view of the liquid crystal display panel in a developed position.

FIG. 4 is a side view showing a driving unit.

5 schematically shows the state of the moment generating means at each development angle of the liquid crystal display panel together with FIG. 6 to FIG. 9, and this figure shows the state when the development angle is about 102 ° (deployment position). It is.

FIG. 6 is a view showing a state in which a development angle is 90 °.

FIG. 7 is a diagram showing a state in which a development angle is 60 °.

FIG. 8 is a diagram showing a state in which a development angle is 30 °.

FIG. 9 is a diagram illustrating a state in which a deployment angle is 0 ° (storage position).

FIG. 10 shows the moment (torque) given to each part by the weight of the liquid crystal display panel, the automatic storage spring, and the moment generating means.
FIG. 4 is a graph showing the relationship between the sum of these and the sum of these.

FIG. 11 is a graph showing the relationship between the weight of the liquid crystal display panel and the moment (torque) given to each part by the automatic storage spring when there is no moment generating means, and the sum of these moments.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Member (display part) supported rotatably, 3 ... Drive means, 4 ... Moment generation means, 14 ...
Compression coil spring, 15 link, 16 link, 17 ...
Link

Claims (3)

[Claims] 1. Moment generating means for applying a predetermined moment to a rotatably supported member, comprising: a compression coil spring; and a biasing force of the compression coil spring transmitted to the rotatably supported member. A plurality of links for performing the operation, the biasing force of the compression coil spring transmitted to the rotatably supported member is such that the biasing force of the compression coil spring always cancels the moment due to the weight of the rotatably supported member. Moment generating means characterized by acting as a moment. 2. A display device using a moment generating means for applying a predetermined moment to a display unit rotatably supported, wherein the display unit is used by expanding from above to below. And a moment generating means having a compression coil spring and a plurality of links for transmitting the urging force of the compression coil spring to the display unit, wherein the urging force of the compression coil spring transmitted to the display unit is a weight of the display unit. A display device using moment generating means, characterized in that it acts as a moment in a direction that always cancels the moment caused by the moment. 3. The display unit according to claim 2, wherein the display unit is rotated by being driven by the driving unit, and the moment generating unit works to assist the turning operation of the display unit by the driving unit. A display device using the moment generating means.