JP3973758B2 - Screen vertical / horizontal switching mechanism for thin display devices - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screen vertical / horizontal switching mechanism of a thin display device for switching the vertical / horizontal direction of a screen in a thin display device such as a liquid crystal monitor.
[0002]
[Prior art]
Some thin display devices such as a liquid crystal monitor can use a screen in a landscape orientation or a portrait orientation. In this type of conventional thin display device, as shown in FIG. The structure is attached to the stand 2 so as to be rotatable around the center O. That is, a rotation mechanism that supports and rotates the center portion of the display unit 11 is provided.
In order to prevent an unnecessary space from being generated below the screen in the horizontally long state, a vertical movement mechanism (not shown) for sliding the display unit 1 up and down together with the rotation mechanism is separately provided.
That is, in FIG. 6A, the screen of the display unit 1 is in a vertically long state. When the display unit 1 in the vertically long state is rotated by 90 ° as shown by an arrow, the display unit 1 is horizontally long as shown in FIG. It becomes a state. In this state, the space below the display unit 1 is increased by h as compared with the vertically long state, and therefore the display unit 1 is slid downward as shown in FIG.
[0003]
[Problems to be solved by the invention]
As described above, the conventional screen vertical / horizontal switching mechanism has a structure in which a rotation mechanism that rotatably supports the central portion O of the display unit 1 and a vertical movement mechanism that slides the display unit up and down are separately provided. There is a problem that it is complicated and expensive.
[0004]
The present invention has been made in view of the above circumstances, and the rotation mechanism and the vertical movement mechanism of the display unit are separated from each other by using a mechanism that performs an operation combining the operation of rotating the display unit and the operation of moving the display unit up and down. It is an object of the present invention to provide a screen vertical / horizontal switching mechanism with a simple structure not included in the above.
[0005]
[Means for Solving the Problems]
The present invention for solving the above problems is a screen vertical / horizontal switching mechanism in a thin display device in which a display unit is attached to a stand so that the vertical / horizontal switching of the screen is possible,
The upper end of the link arranged between the display unit and the stand is supported on the stand so that the upper end of the link can be rotated and the rotation angle can be maintained, and the lower end of the link is lowered from the center of the display unit in the vertically long state of the screen. It is characterized in that it is supported so as to be rotatable and maintain its rotation angle at a position eccentric to the center.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to a screen vertical / horizontal switching mechanism of a thin display device of one embodiment shown in FIGS.
1 is a front view of a thin display device 10 such as a liquid crystal monitor provided with a screen vertical / horizontal switching mechanism 13 according to an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a plan view of FIG. is there. In these drawings, 11 is a display unit of the thin display device, and 12 is a stand. As shown in the figure, the display unit 11 is attached to the stand 12 via a single link 14 having a length c.
[0007]
The upper end of the link 14 is attached to the upper portion of the center in the width direction of the stand 12 so as to be rotatable and the rotation angle thereof can be maintained (the rotation shaft portion is indicated by A), and the lower end is the screen center of the display unit 11 Mounted so as to be able to rotate at a position eccentric by an appropriate distance b downward from O in the vertically long state (leftward in the horizontally long state in FIG. Show).
Further, in this embodiment, the pin 17 is fixed to, for example, the center of the screen on the back surface of the display unit 11, and a notch 18 that can be engaged with the pin 17 is provided on the link 14 side. In addition, the distance from the screen surface center O of the display part 11 of the connecting shaft part A on the stand 12 side of the link 13 is defined as a.
For example, as shown in FIG. 5, the rotation shaft portion A on the upper end side and the rotation shaft portion B on the lower end side of the link 14 are respectively pressed with disc springs 22 and 23 on the respective rotation shafts 20 and 21. The rotation angle of the link 14 is maintained by the friction force of the disc spring 21. In this case, the frictional force of the rotary shaft portion A at the upper end of the link 14 is set to be clearly stronger than the frictional force of the rotary shaft portion B at the lower end. That is, by using two disc springs having different spring forces, for example, the frictional forces on the rotary shafts A and B are made different, so that even if the display unit 11 is rotated with respect to the link 14, the link 14 Is set so that the link 14 rotates with respect to the stand 12 when a larger torque is applied, and the link 14 does not rotate due to the frictional force with the stand 12. Note that the structure shown in FIG. 5 is simplified in order to schematically describe means for making a difference in rotational torque between the two rotary shaft portions A and B.
[0008]
A screen vertical / horizontal switching operation in the thin display device 10 will be described. In FIG. 5, the screen of the display unit 11 is in a horizontally long state, and the rotation shaft B on the display unit 11 side of the link 13 is on the left side of the screen center O. The rotation axis part A on the stand 12 side of the link 13 and the rotation axis part B on the display part 11 side are both constrained to rotate by frictional forces due to the disc springs 22 and 23, and the display part 11 is horizontally long by the restraining force. Held in a state.
[0009]
In this state, the display unit 11 is rotated by α in the counterclockwise direction as indicated by an arrow about the rotation shaft portion B at the lower end portion of the link 13. In this case, as described above, the link 13 is constrained by the frictional force with the stand 12 (greater than the frictional force at the rotating shaft portion B) and does not rotate. Therefore, the pin 17 on the back surface of the display unit 11 is engaged with the notch 18 of the link 13. At this time, as shown in FIG. 5B, the center line n in the width direction in the vertically long state of the display unit 11 coincides with the center line of the link 13.
[0010]
From the state of FIG. 5B, this time the display unit 11 is further rotated by β (α + β = 90 °) around the rotation shaft portion A at the upper end of the link 14. During this rotation, since the pin 17 of the display unit 11 is engaged with the link 14, the display unit 11 and the pin 17 rotate integrally. Thereby, as shown in FIG. 5C, the screen of the display unit 11 is in a vertically long state.
[0011]
Here, the difference s between the height position in the vertically long state and the height position in the horizontally long state of the screen center O of the display unit 11 is s = b− (c−a) as is apparent from the geometrical relationship. = A + b-c (where c is the length of the link 14). Here, since a + b> c always holds, s> 0 is always satisfied. That is, in the vertically long state of (c), the screen center position of the display unit 11 is raised by the distance s. Conversely, when switching from the vertically long state of (c) to the horizontally long state of (a), the screen center O of the display unit 11 is lowered by the height s. Therefore, in the horizontally long state, an unnecessarily large space does not occur below the display unit 11.
[0012]
The means for maintaining the rotation angles of the rotation shaft portions A and B of the link 14 is not limited to the above-described embodiment, and various means can be considered.
[0013]
【The invention's effect】
According to the screen vertical / horizontal switching mechanism of the present invention, the vertical / horizontal switching of the screen is performed by one operation combining the rotation operation for rotating the display unit and the vertical movement operation for moving the display unit up and down. Since this is done by a simple mechanism using a single link, the structure is greatly simplified and the number of parts is greatly increased compared to the conventional structure in which a rotation mechanism and a vertical movement mechanism are separately provided. The effect that it was made was obtained.
[Brief description of the drawings]
FIG. 1 is a front view of a thin display device provided with a screen vertical / horizontal switching mechanism according to an embodiment of the present invention.
FIG. 2 is a right side view of FIG.
3 is a plan view of FIG. 1. FIG.
FIG. 4 is a diagram for explaining details of a rotary shaft portion of a link in the screen vertical / horizontal switching mechanism.
FIG. 5 is an explanatory diagram of the operation of switching the screen between portrait and landscape in the thin display device described above, in the case of changing from the vertically long state of (A) to the vertically long state of (C) through the intermediate state of (B). is there.
FIG. 6 is a front view of a thin display device provided with a conventional screen vertical / horizontal switching mechanism, in which the vertical state is changed from (b) to (b) in the middle state of (b). is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Thin display apparatus 11 Display part 12 Stand 13 Screen vertical / horizontal switching mechanism 14 Link 21, 23 Disc spring

Claims (1)

A screen vertical / horizontal switching mechanism in a thin display device that attaches a display unit to a stand so that the screen can be switched between vertical and horizontal directions,
The upper end of the link arranged between the display unit and the stand is supported on the stand so as to be rotatable and the rotation angle thereof can be maintained, and the lower end of the link is lowered from the center of the display unit to the screen in a vertically long state. A screen vertical / horizontal switching mechanism of a thin display device, characterized in that the screen is supported at a position eccentric to the center so as to be rotatable and maintain the rotation angle.

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