JP3487096B2 - Variable tilt angle mechanism and display device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt angle changing mechanism for changing a tilt angle of a display device such as a projection display device.

[0002]

2. Description of the Related Art For example, among projection type display devices, especially portable ones, it is necessary to have a function of changing a projection angle (tilt angle) according to the height of a screen installed at a site of use. As one of the projection angle changing mechanisms in such a projection display device, there is a projection angle setting device disclosed in Japanese Patent Laid-Open No. 63-50176.

FIG. 9 is a diagram showing a main configuration of a projection angle setting device for a projection type television disclosed in the prior application. In FIG. 9, 101 is the main body of the projection television.
2 is a mounting bracket fixed to the bottom of the main body 101,
a and 102b are positioning protrusions formed on the mounting bracket 102, 102c are long holes formed on the mounting bracket 102,
102d is a guide hole formed in the mounting bracket 102, and 10
Reference numeral 3 denotes a leg portion rotatable with respect to the mounting bracket 102, 103a
Is a fulcrum pin of the leg 103 located in the long hole 102c.

FIG. 9 (a) shows a state in which the legs 103 lie horizontally (the legs 103 are folded in parallel with the bottom of the main body 101), and the main body 101 is in a horizontal position with respect to the floor. Is taking. In order to incline the main body 101 from this state (here, in order to incline so that the front side of the main body 101 is located above the rear side), the front side of the main body 101 is manually lifted and held. In the state, the legs 103
When one end side of the leg portion 103 is rotated in the direction of the arrow M, the other end side of the leg portion 103 abuts on the positioning protrusion 102a of the mounting member 102, and the opening angle of the leg portion 103 is determined. In this state,
If one end of the leg portion 103 is placed on the floor and the hold on the body 101 by hand is eliminated, the weight of the body 101 causes
The leg 103 slides relative to the main body 101 in the direction of the arrow N, the other end of the leg 103 enters the guide hole 102d of the mounting bracket 102, and the fulcrum pin 103a of the leg 103 extends into the elongated hole of the mounting bracket 102. It moves along 102c and shifts to the state shown in FIG. 9 (b).

In the state shown in FIG. 9B, the main body 10
Since the fulcrum pin 103a contacts the upper edge of the elongated hole 102c by its own weight, the movement of the leg portion 103 in the sliding direction is restricted, and the other end side of the leg portion 103 is sandwiched between the positioning protrusions 102a and 102b. The leg portion 103 is restricted from moving in the rotation direction when it is in the state of being embedded. Therefore, in the state shown in FIG.
Is reliably positioned, and the main body 101 (projection type television) is tilted at a predetermined projection angle (tilt angle).

[0006]

In the prior art disclosed in the above-mentioned prior application, the projection angle (tilt angle) of the projection type display device can be changed with a simple structure. But,
The selectable angles are only the two states shown in FIGS. 9A and 9B, and the projection angle cannot be arbitrarily selected. Therefore, there is a problem that the projection angle of the projection display device cannot be finely and continuously changed according to the height of the screen at the site of use.

An object of the present invention is to provide a tilt angle varying mechanism capable of continuously varying the tilt angle of a display device such as a projection type display device.

[0008]

A tilt angle varying mechanism of a display device for changing the tilt angle of the display device body by adjusting the height of at least one leg member arranged on the bottom side of the display device body. , The leg member is provided with a leg main body portion in contact with a floor surface, and a screw shaft portion erected from the leg main body portion, and a state in which the screw of the screw shaft portion is locked on the display device main body side and The tilting member has a holding member which is in a state of being separated from the screw shaft portion, at least a part of which faces the screw shaft portion and which is formed by an internal thread-like portion, and which is separated from the screw shaft portion by the holding member. While making the angle adjustable, with the screw of the screw shaft part locked,
The tilt angle is finely adjusted.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a sectional view of an essential part showing a tilt angle varying mechanism of a display device according to a first embodiment of the present invention, FIG. 2 and FIG.
FIG. 6 is an explanatory diagram showing a relationship between an operation lever and a pressure holding member of the tilt angle varying mechanism of the present embodiment.

1 to 3, 1 is a main body of a liquid crystal projection display device, 2 is a leg member, 3 is a holding frame, 4 is an operating lever, 5 is a pressure holding member, 7 is a rotating arm, and 8 is a rotary arm. Is the floor, 9
Is an elastic pressure member. In the present embodiment and each of the embodiments described later, a liquid crystal projection display device is taken as an example of a display device to be applied, but not only other projection display devices, but also for television receivers and terminals. The present invention is applicable to various display devices such as a monitor display device.

As shown in FIG. 1, the holding frame 3 is a device body 1.
Is fixed to the bottom surface on the front side of the, and the operation lever 4 having the hollow shaft portion 4a fitted in the center hole of the holding frame 3 is
It is rotatably held by the holding frame 3. The operation lever 4 is, as shown in FIGS. 2 and 3, a disk-shaped main body 4
b, a lever portion 4c extending laterally from the main body portion 4b,
A pair of engagement pins 4d, 4d protruding from the upper surface of the main body 4b
The lever portion 4c projects outside the holding frame 3 and can be manually operated.

The pressure holding member 5 is arranged on the upper side of the operation lever 4, and is adapted to operate in conjunction with the rotation of the operation lever 4. As shown in FIGS. 1 to 3, the pressure holding member 5 includes a pair of rotating arms 7 supported by a support shaft 6 so as to be rotatable by a predetermined amount on the bottom surface of the apparatus body 1.
It is composed of 7. Then, on the bottom surface side of each rotating arm 7, there is formed an elongated hole 7a with which the engaging pin 4d of the operating lever 4 is engaged, and a force for sandwiching the screw shaft portion 2b of the leg member 2 from both sides by the elastic pressing member 9. Is applied to pressurize and hold the position of the lever-4. Further, female screw-shaped portions 7b for locking a screw shaft portion 2b of a leg member 2 which will be described later are formed on opposing arc-shaped end surfaces of the rotary arms 7.

The leg member 2 is a leg body portion 2a which is in contact with the floor surface 8.
And a screw shaft portion 2b erected from the leg main body portion 2a. The screw shaft portion 2b, as shown in FIG. 1, is free from the central hole of the operation lever 4 and the hole on the bottom surface of the apparatus main body 1. Insert
A part of it is located inside the apparatus main body 1. Further, in the state shown in FIG. 1, the rotating arms 7, 7 forming a pair with the screw shaft portion 2b are sandwiched.

In each of the present embodiment and the third embodiment to be described later, the leg member (for height adjustment) for adjusting the tilt angle is provided only on the bottom surface of the front side of the apparatus main body 1. A fixed leg is attached to the bottom surface of the apparatus body 1 on the rear side.

As described above, in the state shown in FIG. 1, the screw of the screw shaft portion 2b is held by the holding member 5 (a pair of rotating arms 7,
7) is sandwiched, and the female screw-shaped portion 7b of the pair of rotating arms 7 locks the screw. Therefore, the rotating arms 7, 7 and the screw shaft portion 2b are integrated, and the rotating arms 7,
7 (that is, the apparatus main body 1) and the screw shaft portion 2b are restricted from moving up and down relatively. FIG. 2 is a diagram corresponding to the state of FIG.

In order to adjust the tilt angle (here, it corresponds to the projection angle) from the state shown in FIGS. 1 and 2, the lever portion 4c is operated in the direction of arrow A in FIG. When rotated in the direction, the engaging pin 4d moves along the elongated hole 7a of the rotating arm 7, so that the rotating arms 7 and 7 forming a pair rotate in the directions of arrows B and C of FIG. 3, respectively. By moving, the female screw-shaped portion 7b of the rotating arm 7 is separated from the screw shaft portion 2b. Therefore, the device body 1 side can be moved up and down with respect to the screw shaft portion 2b, and the front portion of the device body 1 is manually lifted or lowered to adjust the operation lever to obtain a desired tilt angle. When 4 is rotated in the opposite direction, the rotating arms 7 and 7 (holding member 5) pinch the screw shaft portion 2b, and the rotating arms 7 and 7 (that is, the apparatus main body 1) The screw shaft portion 2b is integrated.
At this time, since the rotating arm portions 7, 7 are pressed by the elastic pressing member 9, their positions are maintained.

Further, in this embodiment, the tilt angle can be finely adjusted by rotating the leg member 2 in the state shown in FIGS. That is, when the leg member 2 is rotated, the rotating arms 7 and 7 (that is, the apparatus main body 1) move up and down along the screw shaft portion 2b according to the rotation direction of the leg member 2, thereby finely adjusting the tilt angle. Can be achieved.

As described above, according to this embodiment, a tilt angle changing mechanism capable of changing the tilt angle of the display device to any desired angle (the tilt angle can be continuously changed) can be realized with a simple structure.

FIG. 4 is a sectional view of an essential part showing a tilt angle varying mechanism of a display device according to a second embodiment of the present invention.
The same components as those in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted to avoid duplication (this is the same in each of the following embodiments).

The difference of this embodiment from the first embodiment is that a biasing force is applied between the leg body 2a of the leg member 2 and the holding frame 3 (apparatus body 1) in the direction of pushing up the apparatus body 1. The point is that the supporting spring 10 is provided. The pushing-up spring force of the support spring 10 is set to be approximately equal to or slightly smaller than the load sharing of the weight of the apparatus body 1 on the leg member 2.

In this embodiment, since the support spring 10 is provided, as shown in FIG. 3, when the pressure holding member 5 (rotating arms 7, 7) releases the lock of the screw shaft portion 2b, The support spring 9 cancels out most of the self-weight of the apparatus body 1, and the apparatus body 1 can be moved up and down with an extremely light force. Therefore, the lever portion 4 of the operation lever 4
c (FIGS. 2 and 3) is rotated to release the locking of the pressure holding member 5 to the screw shaft portion 2b, and then the lever portion 4
By vertically moving c, the front part of the apparatus body 1 can be vertically moved. In order to reduce the change in spring force due to the vertical displacement of the apparatus body 1, it is desirable that the support spring 10 has a large number of turns.

In this embodiment having such a structure, in addition to the effect of the first embodiment, the operability in adjusting the tilt angle is improved.

FIG. 5 and FIG. 8 are cross-sectional views of the essential parts showing the tilt angle varying mechanism of the display device of the third embodiment of the present invention, and FIGS. 6 and 7 are operation levers of the tilt angle varying mechanism of this embodiment. It is explanatory drawing which shows the relationship between a pressure clamping member and an elastic pressure member. The present embodiment differs from the first and second embodiments in that the pressure holding member 5 of the second embodiment rotates horizontally.
In the present embodiment, the pressure holding member 5'for holding the screw shaft portion 2b of the leg member 2 in the vertical direction is rotated, and the U-shaped elastic body 11 presses the screw shaft 2b. Are the same.

That is, as shown in FIGS. 5 and 7, the pressure holding member 5 ′ of this embodiment has a support shaft 6 on the bottom surface of the apparatus body 1.
Is constituted by a pair of rotating arms 7 ', 7'which are held so as to be vertically rotatable. Then, similarly to the above, on the bottom surface side of each rotating arm 7, there is formed an elongated hole 7a with which the engaging pin 4d of the operation lever 4 engages, and on the arcuate end surfaces of each rotating arm 7 facing each other. , Leg member 2
A female screw-shaped portion 7b for locking the screw shaft portion 2b is formed.

5 and 7, the pressure holding member 5 '(a pair of rotating arms 7', 7 ') is a U-shaped elastic body 11 and the shaft portion 2b.
6 shows a state in which the screw shaft portion 2b of the leg member 2 is locked by pressing in the direction of the center, and FIGS. 6 and 8 show that the pressure holding member 5 ′ is rotated by operating the operation lever 4. It shows a state where the locking of the screw shaft portion 2b is released. The operation of this embodiment is the same as that of the second embodiment except that the holding member 5'rotates in the vertical direction (directions of arrows D and E in FIG. 8).

Further, referring to FIGS. 6 and 7, the U-shaped elastic body 12 is shown.
Is formed in a direction in which both ends thereof are opened, and a resistance force is exerted in both ends in the direction of opening in proportion to the closed distance from the unloaded state.

In the state of FIG. 6, when the lever portion 4c of the operating lever 4 is rotated rightward in the drawing with the screw shaft portion 2c as the center, with the both ends of the U-shaped elastic body 12 closed, the engaging pin is rotated. By rotating to the right like 4d, the U-shaped elastic body 1
The distance between both ends of 2 is slightly smaller than that in the state of FIG. 6, and the lever portion 4c receives a leftward drag force. When the lever portion 4c is further rotated rightward in the drawing to the state shown in FIG. 7, the distance between both ends of the U-shaped elastic body 12 is opened, and a force for rotating the lever portion 4c rightward is exerted.

The lever portion 4 is operated by the action of the U-shaped elastic body 12.
c is held in the state of being positioned on the left side in FIG. 6 and in the state of being positioned on the right side in FIG. 7, and can be changed by manipulating the lever portion 4c.

Next, as an example, a U-shaped elastic body 1 shown in FIG.
Both ends of 2 are opened and closed in the state of FIG. 7, and both ends are closed by a distance in each of the states shown in FIGS. 6 to 7.

As a result, both ends of the U-shaped elastic body always act in the opening direction so that the state shown in FIG. 6 is maintained, and only when the lever portion 4c is rotated rightward in the figure.
The state shown in FIG. 7 is obtained. This means that the lever portion 4c can be rotated as much as possible to the state shown in FIG. 7 only when the height of the leg 2 is changed, so that the operation becomes simple.

[0032]

According to the present invention, a tilt angle changing mechanism capable of changing the tilt angle of a display device to any desired angle (the tilt angle can be continuously changed) can be realized with a simple structure. Further, it is possible to realize a tilt angle varying mechanism which is excellent in operability when adjusting the tilt angle and is easy to use.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a tilt angle varying mechanism of a display device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a relationship between an operation lever and a holding member in the first embodiment of the present invention.

FIG. 3 is an explanatory view showing a relationship between an operation lever and a holding member in the first embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a tilt angle varying mechanism of a display device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of an essential part showing a tilt angle varying mechanism of a display device according to a third embodiment of the present invention.

FIG. 6 is an explanatory view showing a relationship between an operation lever and a holding member according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a relationship between an operation lever and a holding member according to a third embodiment of the present invention.

FIG. 8 is a sectional view of an essential part showing a tilt angle varying mechanism of a display device according to a third embodiment of the present invention.

FIG. 9 is an explanatory diagram of a conventional projection angle setting device for a projection television.

[Explanation of symbols]

1 ... Device body, 2 ... leg members, 2a ... leg body, 2b ... screw shaft part, 3 ... Holding frame, 4 ... operating lever, 4a ... Hollow shaft portion, 4b ... main body, 4c ... lever part, 4d ... engaging pin, 5 ... Holding member, 7 ... Rotating arm, 7a ... long hole, 7b ... Female threaded portion, 8 ... floor, 9 ... Elastic pressure member.

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Claims (3)

(57) [Claims] 1. A tilt angle varying mechanism for a display device, wherein the tilt angle of the display device body is changed by adjusting the height of at least one leg member disposed on the bottom side of the display device body. to a leg body part in contact with the floor surface, it is provided a screw shaft portion which is Tatsushide from the leg body portion, the upper Symbol display apparatus main body, locking the screw of the screw shaft portion
The state can be separated from the screw shaft portion,
At least a part facing the screw shaft is composed of a female thread.
A holding member that is separated from the screw shaft portion by the holding member.
The tilt angle can be adjusted and the screw shaft
Finely adjust the tilt angle with the screw locked.
A tilt angle varying mechanism for a display device, which is configured as described above . 2. A display device having a tilt angle varying mechanism for changing the tilt angle of a main body by adjusting the height of at least one leg member arranged on the bottom side, wherein the leg member is a floor. The leg body portion that is in contact with the surface, and the screw shaft portion that stands upright from the leg body portion. The screw can be in a state of locking the screw of the screw shaft portion and a state of being separated from the screw shaft portion. At least a part of the screw shaft portion facing the shaft portion has a sandwiching member, and the sandwiching member allows the tilt angle to be adjusted in a state of being separated from the screw shaft portion, and the screw shaft portion A display device, characterized in that the tilt angle is finely adjusted with the screw locked. 3. The display device according to claim 1, further comprising elastic means for pressing the holding member in a state where the screw of the screw shaft portion is locked.