JP4665254B2 - Display device - Google Patents

Description

  The present invention relates to a technical field related to a display device that is easy to see when lying down or lying down.

As a device that makes it easy to see the display device when lying on its back or lying down, a technique that can easily change the position of the display device according to the preference of the viewer is disclosed. (See Patent Documents 1 and 2)
Japanese Patent Laying-Open No. 2005-084671 JP 2005-195711 A

However, conventionally known techniques have the following problems.
That is, in Patent Documents 1 and 2, the display device is kept at a substantially constant distance from the viewer's head axis by causing the rotation axis of the display device and the viewer's head axis to substantially coincide with each other. The technology of a display device that can be rotated with a slight force while directing the display surface is disclosed. In this display device, the torque of the display device is canceled on the opposite side of the display device with respect to the rotation axis. In order to reduce the size of the display device, it is necessary to use a balancer, and it is necessary to increase the mass of the balancer. As a result, the mass of the display device increases, making it difficult to transport and install the device.
Further, when a display device having a large screen size is used, there is a problem that not only the display device but also the mass of the balancer increases.

  The present invention has been made in view of the above-mentioned problems of the prior art, and in either the supine or right / left lying state, the display device is always directed toward the viewer side while maintaining a substantially constant distance from the viewer's head axis. However, it is possible to realize a large-screen and lightweight display device that can be rotated with a slight force.

  In order to solve the above-described problems of the prior art and achieve the above-described object, the display device according to the first aspect of the present invention is configured such that the chassis holding means holds the chassis and the chassis holds the rotating shaft. Holding means A and motor A, rotating shaft holding means A holding rotating shaft A, rotating shaft A holding arm, arm holding projector and screen, and between rotating shaft A and motor A And a rotational force transmission means A having a transmission torque limiting function.

  In order to solve the above-mentioned problems of the prior art and achieve the above-mentioned object, the display device of the invention described in claim 2 of the present invention has a chassis holding means in addition to the features described in claim 1. Further holds the rotating shaft B, and the chassis further holds the rotating shaft holding means B and the motor B, so that the chassis is held by the chassis holding means and can rotate around the rotating shaft B. Rotational force transmission means B having a transmission torque limiting function is provided between the motor B and the motor B.

  Further, in order to solve the above-mentioned problems of the prior art and achieve the above-mentioned object, the display device of the invention described in claim 3 of the present invention has a chassis holding function in addition to the features described in claim 1. The means further holds the rotating shaft holding means B and the motor B, and the chassis further holds the rotating shaft B, so that the chassis is held by the chassis holding means and can be rotated around the rotating shaft B. A rotational force transmission means B having a transmission torque limiting function is provided between B and the motor B.

According to the invention described in the first claim, the chassis holding means holds the chassis, the chassis holds the rotating shaft holding means A and the motor A, the rotating shaft holding means A holds the rotating shaft A, and rotates. Since the axis A holds the arm, the arm holds the projector and the screen, and the rotation force transmitting means A having the transmission torque limiting function is provided between the rotation axis A and the motor A, the chassis holding means is, for example, a bed When fixed to the headboard, the chassis is fixed, the rotating shaft holding means A held by the chassis holds the rotating shaft A, and the arm held by the rotating shaft A holds the projector and the screen.
Here, the maximum torque that can be transmitted by the rotation axis transmission means A is larger than the torque around the rotation axis A generated by gravity by the arm, the projector and the screen held by the arm, and the transmission limit of the rotation axis transmission means A is limited. When the stationary torque of the motor A is larger than the torque, the arm is stationary unless a force is applied from the outside.

Further, by appropriately selecting the position of the projector and the screen and the position of the rotation axis A, the torque around the rotation axis A generated by gravity by the arm and the projector and the screen connected to the arm can be brought close to 0 (zero). Is possible.
In this way, the transmittable limit torque of the rotary shaft transmission means A can be reduced, so that a slight force from the outside can be applied to the arm to rotate the screen and projector around the rotary axis A. become able to.
Further, the position of the screen and the projector can be rotated around the rotation axis A also by supplying a current to the motor A.
Since the relative position of the projector and the screen does not change even when the arm rotates, the image on the screen projected from the projector is displayed normally regardless of the position of the arm.

Therefore, by fixing the chassis to the headboard of the bed via the chassis holding means and keeping the central axis of the rotation axis A and the viewer's head axis substantially equal, the viewer can exert a slight force. By controlling the current applied to the arm or the motor A, the screen can be rotated around the rotation axis A and stopped. It is possible to easily place the screen at the appropriate viewing position even for the lying heel.
Compared to Patent Document 1 and Patent Document 2, the projector plays the role of the balancer described in the same document, and the screen plays the role of the display device of the same document, thereby reducing the mass of the entire display device. There is an effect that the apparatus can be easily transported and installed.

  According to the invention described in the second claim, in addition to the features described in claim 1, the chassis holding means further holds the rotating shaft B, and the chassis further holds the rotating shaft holding means B and the motor B. In addition, since there is a rotational force transmission means B having a transmission torque limiting function between the rotation shaft B and the motor B, if the chassis holding means is fixed to the headboard of the bed, for example, the chassis is held by the chassis holding means, And it becomes possible to rotate around the rotation axis B.

Here, the maximum transmittable torque of the rotating shaft transmission means B is larger than the torque around the rotating shaft B generated by gravity by the chassis and the components held by the chassis, and the motor is larger than the transmittable limit torque of the rotating shaft transmitting means B. When the static torque of B is large, the chassis will be stationary if no force is applied from the outside.
Further, the rotating shaft holding means B uses a bearing or the like, and by keeping the rotating shaft B substantially vertical, the torque around the rotating shaft B generated by gravity by the chassis and the components held by the chassis can be brought close to 0 (zero). Is possible.

In this way, the transmittable limit torque of the rotary shaft transmission means B can also be reduced, so that the chassis will stop if no force is applied to the chassis from the outside, and the chassis will rotate if a slight force is applied. Can be rotated around the rotation axis B.
The chassis can also be rotated by passing an electric current through the motor B, and the position of the screen can be rotated around the rotation axis B.
Also in this case, since the relative position between the projector and the screen is not changed, the image on the screen projected from the projector is normally displayed regardless of the position of the chassis.

Therefore, since the viewer can apply a slight force to the chassis or control the current flowing through the motor B, the screen can be rotated around the rotation axis B or stopped. Therefore, in addition to the invention of the first aspect, there is an effect that the screen can be placed in the appropriate viewing position more easily.
In addition, by making the arm vertical and rotating the chassis 90 degrees around the rotation axis B from the normal supine viewing position, an effect that does not hinder the viewer's wake-up / landing operation can be obtained.

Further, according to the invention described in the third claim, in addition to the invention described in the first claim, the chassis holding means further holds the rotating shaft holding means B and the motor B, and the chassis further includes the rotating shaft. By holding B, the chassis is held by the chassis holding means and can rotate about the rotation axis B, and the rotation force transmission means B having a transmission torque limiting function is provided between the rotation axis B and the motor B. As in the invention described in the second claim, if the chassis holding means is fixed to the headboard of the bed, for example, the chassis can be held by the chassis holding means and can be rotated around the rotation axis B. It becomes.
Also in this invention, the rotating shaft holding means B can use a bearing or the like and keep the rotating shaft B substantially vertical so that the torque around the rotating shaft B can be brought close to 0. The invention according to claim 2 Equivalent effect is obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First Embodiment This embodiment is an embodiment corresponding to the first aspect of the present invention, and FIGS. 1, 2 and 3 are diagrams for explaining a display device according to the present embodiment.
FIG. 1 is a view in which a viewer 10 lies on the bed 20 and watches an image formed on the screen 40 by light projected from the projector 30.
The display device 100 according to this embodiment includes a chassis holding unit 80, a chassis 60, a rotary shaft holding unit A61, a motor A70, a rotary shaft A54, an arm 50, a screen 40, a projector 30, and a rotational force transmission unit A90 having a transmission torque limiting function. Etc.
In this embodiment, there are a drive circuit for supplying a drive current to the motor A, a wired or wireless remote controller for controlling the drive circuit, etc., but this is not shown for the sake of simplicity.
In the display device 100, the chassis holding means 80 holds the chassis 60, and the chassis 60 holds the rotating shaft holding means A61 and the motor A70.
The rotation axis holding means A61 holds the rotation axis A54, the rotation axis A holds the arm 50 at the arm C point 52, the arm 50 holds the screen 40 at the arm end A51, and the arm end B53. The projector 30 is held.
Further, there is a rotational force transmission means A90 having a transmission torque limiting function between the motor A70 and the rotation shaft A54.
Here, the display device 100 is fixed by attaching the chassis holding means 80 to the headboard 23 of the bed.
It is desirable that the central axis of the rotation axis A and the viewer's head axis be as close as possible.

FIG. 2 is an enlarged view of the vicinity of the chassis.
Here, the rotational force transmission means A90 having a transmission torque limiting function is composed of a rotation shaft A pulley 91, a motor A pulley 92, and a urethane round belt A93, and the transmission torque between the motor A and the rotation shaft A is Ts. If it exceeds, the urethane round belt A slips and torque of Ts or more is not transmitted.
In this embodiment, a pulley and a urethane round belt are used for the rotational force transmission means A having a transmission torque limiting function. However, the present invention is not limited to this, and for example, a metal roller is attached to the rotation shaft A, and the motor A A structure in which a urethane roller is attached to the rotating shaft, both the rollers are brought into pressure contact to transmit a rotational force, and a transmission torque limiting function is provided is considered to be included in the present invention.
In FIG. 2, the rotary shaft holding means A61 has a U-shaped sheet metal with a round hole having a diameter slightly larger than the diameter of the rotary shaft A, but a bearing or the like can also be used. The rotation shaft A is preferably held by the rotation shaft holding means A and is a mechanism that rotates smoothly.

となる。
従って、Ｃ点を適度に選択することにより、回転軸Ａ周りのトルクの合計Ｔｔはほぼゼロにすることが可能である。
また、必要であればプロジェクタに軽度なバランサーを付加し、Ｔｔをほぼ０にすることも可能である。
ここで、モータＡの静止トルクをＴｍｓとしたとき、

が成り立てば、アームは外部から力を加えられなければ静止する。
またＴｔをほぼゼロとすれば、Ｔｓも小さくでき、回転軸保持手段Ａは回転軸Ａを滑らかに回転させつつ保持できることから、アームを非常に軽微な力でシャーシに対して回転させることができる。
従って図３に示すように視聴者が左横臥した場合は、アームに軽く力を加えることで、アームを視聴者から見て左側に適度に傾け、スクリーンを視聴者のほぼ正面に持ってくることが可能となる。In such a configuration, the screen mass Ms, the distance between the center of gravity of the screen and the point C is Ls, the projector mass Mp, the distance between the center of the projector and the point C is Lp, the arm mass Ma, and the center of gravity of the arm. Assuming that the distance to point C is La and the position of the center of gravity of the arm is on the screen side with respect to point C, the total torque Tt around point C possessed by each of the arm, projector, and screen is

It becomes.
Accordingly, by appropriately selecting the point C, the total torque Tt around the rotation axis A can be made substantially zero.
Further, if necessary, a light balancer can be added to the projector to make Tt almost zero.
Here, when the static torque of the motor A is Tms,

If is established, the arm will be stationary if no external force is applied.
Further, if Tt is made substantially zero, Ts can also be reduced, and the rotary shaft holding means A can hold the rotary shaft A while smoothly rotating it, so that the arm can be rotated with respect to the chassis with a very slight force. .
Therefore, when the viewer is lying on the left as shown in FIG. 3, by gently applying force to the arm, the arm is tilted moderately to the left side when viewed from the viewer, and the screen is brought almost in front of the viewer. Is possible.

Further, by operating a wired or wireless remote controller (not shown), it is possible to pass a current for rotating the motor A forward or backward.
In this case, the viewer can operate the remote control button to bring the screen almost in front of the viewer.
In addition, for example, a sensor is installed so that the viewer detects the inclination of the head axis, and a current is passed through the motor A according to the output of the sensor, so that the screen is automatically brought in front of the viewer. It is also possible to come.
In any case, since the relative position between the projector 30 and the screen 40 does not change, the image projected on the screen is unchanged.
In this embodiment, a DC geared motor is used for the motor A, but the present invention is not limited to this, and an AC motor, a stepping motor, or the like can also be used.

  Further, the present invention is not limited to be used in association with a bed. If the chassis holding means 80 is fixed using the floor holding means 24 as shown in FIG. Of course, the present display device can be used while lying on the floor or on the bedding 22 on the fold 21.

As the projector according to the present embodiment, for example, TDP-FF1A currently available from Toshiba Corporation as of January 2007 can be used.
This projector has a mass of 740 grams including batteries, and if the distance from the projector to the screen is 80 cm, the screen will be approximately 22 inches.
Furthermore, in the design example of the first embodiment, a 22-inch screen with a mass of 68 grams having a center of gravity at a distance of 46.7 cm from the rotation axis A, and a projector with the above-mentioned mass of 740 grams at a distance of 7.4 cm from the rotation axis A. Is mounted on an arm with a mass of 294 grams and centered at a distance of 18.5 cm (screen side) from the rotation axis A, Tt is approximately 20 g · cm, and Ts of 100 g · cm is sufficient and very light. It can be rotated by force.
Further, the torque required for the motor A is small, and a small and inexpensive motor can be used.

Effects of First Embodiment A viewer who uses the display device of the present embodiment, when lying on his / her back, makes the arm vertical, when lying on the left side, the arm is directed leftward, and when lying on the right side, the arm is moved. It can be rotated by a slight force in the right direction or by operating a remote control button.
Further, if the rotation axis A of the arm and the viewer's head axis are substantially matched, it is possible to adjust so that the screen is always in front of the viewer.
The operation of the present embodiment is the same as that of the display device disclosed in Patent Documents 1 and 2, but the heavy balancer required in Patent Documents 1 and 2 is not necessary and a projector is used. Therefore, although the display screen size is large, it is possible to reduce the mass of the display device as compared with Patent Documents 1 and 2, and there is an effect that the device can be easily transported and installed.
Furthermore, when the arm or screen touches the viewer or the bedding, the function of the rotational force transmitting means A having a transmission torque limiting function is advantageous in that it stops at that position and hardly damages the viewer or the bedding.

Second Embodiment This embodiment is an embodiment corresponding to the invention described in claim 2, and FIGS. 4, 5, 6, and 7 are diagrams for explaining a display device according to the present embodiment. .
In FIG. 4, the viewer 10, the bed 20, the projector 30, the screen 40, the arm 50, the rotation axis A54, the motor A70, the rotational force transmission means A90, and the like are the same as those in the first embodiment, and a description thereof will be omitted.
In the present embodiment, the display device 100 includes a rotation shaft B55, a rotation shaft holding unit B62, a motor B71, and a rotational force transmission unit B94 having a transmission torque limiting function in addition to the components of the first embodiment. .
Here, the chassis holding means 80 holds the rotating shaft B55, and the chassis 60 holds the rotating shaft holding means B62 (not shown).
In addition, the chassis 60 holds the motor B71, and has a rotational force transmission means B94 having a transmission torque limiting function between the rotation shaft B55 and the motor B71.
FIG. 5 is an enlarged view of the vicinity of the chassis 60 of this embodiment.
Here, the rotational force transmitting means B94 includes a rotary shaft B pulley 96, a motor B pulley 97, and a urethane round belt B98.
In the present embodiment, there are a drive circuit for supplying a drive current to the motor B, a wired or wireless remote controller for controlling the drive circuit, etc., but this is not shown for simplicity of explanation.

が成り立てば、シャーシ６０は外部から力を加えられなければ静止する。
またＴｔｌをほぼゼロとすれば、Ｔｓｌも小さくでき、シャーシ６０を非常に軽微な力でシャーシ保持手段８０に対して回転させることができる。
さらに、本表示装置は図示していないワイヤードもしくはワイヤレスのリモコンのボタンを操作することにより、モータＢに正回転もしくは逆回転させるための電流を流すことも可能である。
本実施形態においても、モータＢに必要とされるトルクも小さく、小型・安価なモータの使用が可能である。
この場合、視聴者がリモコンボタンを操作して、シャーシをシャーシ保持手段に対して回転させることができる。
いずれの場合も、プロジェクタ３０とスクリーン４０との相対位置は変らないため、スクリーン上に投射された映像は不変である。FIG. 6 is an exploded view for clearly showing the periphery of the rotation axis B of the present embodiment.
Here, the rotation shaft B55 is held by the display device holding means 80, and the rotation shaft holding means B62 is a bearing and is held by the chassis bottom 63 which is a part of the chassis 60.
The rotary shaft B55 is fitted with a rotary shaft B pulley 96 after being press-fitted and penetrated into the bearing.
With this configuration, the chassis 60 is supported by the rotation axis B and the bearing and can rotate around the rotation axis B.
Further, the motor B71 is held by the chassis 60, and a motor B pulley 97 is mounted on the rotation shaft of the motor B, and a urethane round belt B98 is provided between the rotation shaft B pulley 96 and the motor B pulley 97. When the transmission torque between B and the rotating shaft B exceeds Tsl, the urethane round belt B slips and does not transmit torque more than Tsl.
Therefore, for example, when the display device of the present embodiment is fixed to the headboard using the chassis holding device 80, when the rotation axis B is kept substantially vertical, the rotation generated by gravity by the chassis 60 and the components held by the chassis. The torque Ttl around the axis B55 can be brought close to zero.
Here, when the stationary torque of the motor B is Tmsl,

If the above holds, the chassis 60 will be stationary if no force is applied from the outside.
If Ttl is set to almost zero, Tsl can also be reduced, and the chassis 60 can be rotated with respect to the chassis holding means 80 with a very slight force.
Furthermore, this display device can also flow a current for causing the motor B to rotate forward or backward by operating a button of a wired or wireless remote controller (not shown).
Also in this embodiment, the torque required for the motor B is small, and a small and inexpensive motor can be used.
In this case, the viewer can operate the remote control button to rotate the chassis relative to the chassis holding means.
In any case, since the relative position between the projector 30 and the screen 40 does not change, the image projected on the screen is unchanged.

Effects of the Second Embodiment In addition to the effects of the first embodiment, the viewer using the display device of the present embodiment can easily rotate the chassis by a slight force or operation of a remote control button, and the screen There is an effect that can be placed at a position where it is easier to see.
As shown in FIG. 7, when this display device is not used, the arm is made vertical and the chassis is rotated 90 degrees around the rotation axis B from the normal supine viewing position, so that the screen is woken up by the viewer. There is an effect that it is also possible to place it in a position that does not hinder the floor movement.
In addition, when the arm or screen touches the viewer or the bedding by the function of the rotational force transmitting means B having the transmission torque limiting function, there is an effect that the arm or the screen is stopped at that position and the viewer or the bedding is hardly damaged.

Third Embodiment This embodiment is an embodiment corresponding to the invention described in claim 3, and FIG. 8 is an exploded view for clearly showing the periphery of the rotation axis B used in the display device in this embodiment. In the embodiment, the constituent elements of the display device 100 are the same as those in the second embodiment, but the chassis holding means 80 holds the rotating shaft holding means B62 and the motor B71 as shown in FIG.
In the chassis 60, the chassis bottom 63 holds the rotating shaft B pulley 96, and the rotating shaft B55 is attached to the rotating shaft B pulley.
Furthermore, the rotating shaft holding means B62 is a bearing, and the rotating shaft B55 is press-fitted.
In addition, a motor B pulley 97 is mounted on the rotation shaft of the motor B 71, and a urethane round belt B 98 is put between the rotation shaft B pulley 96 and the motor B pulley 97 to constitute a rotational force transmission means B 94.
Therefore, when the display device of the present embodiment is fixed to the headboard using the chassis holding device 80, when the rotation axis B is kept substantially vertical, as in the second embodiment, if Equation 3 is established, it will be externally applied. If no force is applied, the chassis will be stationary.
Further, since the chassis 60 can be rotated with respect to the chassis holding means 80 by applying a very slight force to the chassis 60 or operating the remote controller, the display device of this embodiment is the second embodiment. The same effect as the shape can be obtained.

Explanatory drawing of the display apparatus in 1st Embodiment The enlarged view of the chassis vicinity in 1st Embodiment Explanatory drawing when a viewer lies on the left side in the first embodiment Explanatory drawing of the display apparatus in 2nd Embodiment The enlarged view of the chassis vicinity in 2nd Embodiment Exploded view for clearly showing the periphery of the rotation axis B of the second embodiment Explanatory drawing when not using a display device in the second embodiment Exploded view for clearly showing the periphery of the rotation axis B of the third embodiment Application example on the floor or fold in the first embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Viewer 20 ... Bed 21 ... Floor or fold 22 ... Bedding 23 ... Headboard 24 ... Floor holding means 30 ... Projector 40 ... Screen 50 ...・ Arm 51: Arm end A
52 ... Arm C point 53 ... Arm end B
54 ... Rotating axis A
55 ... Rotating shaft B
60 ... Chassis 61 ... Rotating shaft holding means A
62... Rotating shaft holding means B
63: Chassis bottom 70: Motor A
71 ... Motor B
80 ... Chassis holding means 90 ... Rotational force transmitting means A
91 ... Rotating shaft A pulley 92 ... Motor A pulley 93 ... Urethane round belt A
94... Rotational force transmission means B
96 ... Rotary shaft 8 pulley 97 ... Motor B pulley 98 ... Urethane round belt B
100 ... Display device

Claims (3)

The chassis holding means holds the chassis, the chassis holds the rotating shaft holding means A and the motor A, the rotating shaft holding means A holds the rotating shaft A, the rotating shaft A holds the arm, and the arm is the rotating shaft A. Between the rotating shaft A and the motor A, and the transfer torque that is larger than the rotating torque around the rotating shaft A generated by gravity by the arm, projector, and screen between the rotating shaft A and the motor A. Display device having rotational force transmitting means A having a limiting function 2. The chassis holding means further holds the rotating shaft B, and the chassis further holds the rotating shaft holding means B and the motor B so that the chassis is held by the chassis holding means and around the rotating shaft B. Rotational force transmitting means B having a transmission torque limiting function which is rotatable and is larger than the rotational torque around the rotational axis B generated between the rotational axis B and the motor B by the gravity between the chassis and the components held by the chassis. Display device having In Claim 1, the chassis holding means further holds the rotating shaft holding means B and the motor B, and the chassis further holds the rotating shaft B, whereby the chassis is held by the chassis holding means and around the rotating shaft B. Rotational force transmitting means B having a transmission torque limiting function which is rotatable and is larger than the rotational torque around the rotational axis B generated between the rotational axis B and the motor B by the gravity between the chassis and the components held by the chassis. Display device having

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