JP2000241875A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust a level and an elevation angle while viewing a projected image. SOLUTION: As for the device, in the case of rotating a rotary knob 1a so as to supply a driving force to a horizontal shaft, a screw gear installed on the other end of the horizontal shaft is rotated, then, a gear which is arranged on the vertical shaft so as to be engaged with the screw gear (a) is rotated, then, the vertical shaft is rotated, and the screw gear (b) at the leading end of the vertical shaft is rotated, and a female screw in the expansion part cylinder of an expansion leg 1b is engaged with the screw gear (b), then, the expansion leg 1b is moved in a vertical direction. For example, in the case of rotating the rotary knob 1a to the right, the expansion leg 1b is moved upwards, then, the expansion leg 1b is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device capable of easily adjusting an elevation angle and a horizontal position.

[0002]

2. Description of the Related Art FIG. 6 is a schematic view for explaining a state in which a liquid crystal projector enlarges and projects a projected image on a screen, and is an overall view showing a state of the projected image and an enlarged view showing expansion and contraction of a foot of the liquid crystal projector. It is. As shown in the overall view of FIG. 6, when the image display device, for example, the liquid crystal projector 1 enlarges and projects a projected image on a screen, the horizontal of the projected image does not coincide with the horizontal of the screen and is inclined. Or, the projected image may be displayed in an unsightly state, such as being displayed near the edge of the screen. Therefore, as shown in the enlarged view, a horizontal adjustment for adjusting the horizontal inclination of the liquid crystal projector and an elevation angle for performing the front and rear inclination adjustment can be performed. Directly rotate the telescopic legs to expand and contract,
Horizontal adjustment and elevation angle adjustment are performed by adjusting the height.

However, for adjusting the height of each extensible foot, for example, a method of rotating a screw type extensible foot provided at the four corners of the bottom surface of the liquid crystal projector 1 or the like is adopted. It is difficult to put a finger between the bottom surface of the projector 1 and the table, and it is difficult to rotate the extensible feet, so that adjustment is difficult. Therefore, conventionally, the power supply of the liquid crystal projector 1 is turned off, the liquid crystal projector 1 in a non-operating state is raised, for example, with its side face down, and the expansion and contraction feet are adjusted to be in a state where they can be easily rotated.

In the above-described conventional horizontal adjustment and elevation angle adjustment methods, although the expansion and contraction is easily performed by rotating the expansion and contraction feet, the projected image being adjusted cannot be viewed, so that the degree of adjustment is difficult to understand easily. However, there is a problem that it requires skill, and it takes time and effort for adjustment.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an image display device capable of easily performing horizontal adjustment and elevation angle adjustment while viewing a projected image.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an image display device such as a liquid crystal projector having telescopic legs for adjusting the elevation angle and for adjusting the horizontal position on the bottom surface of a housing. A plurality of telescopic legs having a cylindrical telescopic portion provided with a screw, a vertical shaft having a male screw at the distal end to be screwed to the female screw and a gear at the other end, and rotatable outside the housing And a screw gear connected to the shaft of the rotary knob and screwed to the gear at the other end.

Further, the rotary knob is provided on the side surface of the housing for each of the extendable feet.

[0008] In addition, one telescopic leg is provided at the front center of the bottom surface of the housing and one at the rear left or right end, and one fixed foot is provided at the other rear end of the bottom of the housing. One knob is provided for each telescopic foot.

[0009] Further, a 1 is provided at the front center of the bottom surface of the housing.
The rotary knob corresponding to each telescopic foot is configured as a rotary ring installed on the outer periphery of the base of the projection lens barrel suspended from the front wall (front panel) of the housing.

[0010] Further, a 1 is provided at the center of the front side of the bottom surface of the housing.
The extensible feet are configured to extend and retract by rotating a rotary knob provided on the front upper surface of the housing.

[0011] Further, the rotation axis of the telescopic foot is the same as the rotation axis of the rotation knob provided on the front upper surface of the housing.

An image display apparatus such as a liquid crystal projector having a telescopic foot for elevation angle adjustment and a horizontal adjustment on a bottom surface of a housing, comprising a plurality of telescopic feet having a cylindrical telescopic part provided with a female screw therein. A vertical shaft having a male screw screwed to the female screw at the distal end, a drive motor having a rotary shaft connected to the vertical shaft, and an operation switch for inputting an operation instruction to the drive motor.

Further, the drive motor is constituted by a pulse motor.

A plurality of the above-mentioned drive motors are provided for each of the telescopic legs, and are operated by operation switches provided at one place on the housing.

Further, a remote control device is provided in the image display device, and the drive motor is operated by an instruction from the remote control.

Also, the drive motor and the vertical shaft are connected via a gear coupling mechanism.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Since the present invention is constructed as described above, an image display device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of an image display device according to the present invention, which is an overall external view (a) and an enlarged view of a main part (b). A description will be given with reference to the entire external view (a). Reference numeral 1 denotes a rotary knob having a telescopic leg 1b for elevation angle adjustment and horizontal adjustment on the bottom surface of the housing, and for supplying a driving force for expanding and contracting the corresponding telescopic leg 1b for every four telescopic legs 1b, for example. An image display device such as a liquid crystal projector in which 1a is provided on a side surface of a housing.

The operation of the telescopic legs of the image display device according to the present invention will be described with reference to FIG. When the rotary knob 1a is rotated to supply the driving force to the horizontal axis, a screw gear provided at the other end of the horizontal axis rotates, and by rotating a gear provided on the vertical axis to which the screw gear a is screwed, the vertical axis is changed. As the screw gear b at the tip of the vertical shaft rotates and the female screw in the cylinder of the telescopic part of the telescopic foot 1b is screwed, the telescopic foot 1b moves up and down. For example, rotary knob 1
When a is rotated right, the telescopic foot 1b moves upward, and the telescopic foot 1b contracts. Therefore, when the rotary knob 1a is rotated, the telescopic foot 1b moves up and down in accordance with the direction of the rotation, thereby performing an expanding / contracting operation. The feature of this embodiment is that the rotation knob 1a corresponding to the telescopic foot 1b at the required position is rotated while watching the projection image of the liquid crystal projector,
The elevation angle adjustment and the horizontal adjustment can be performed easily and quickly. The structure including the screw gears a and b, the gears, the female screw, and the like for transmitting the driving force, changing the number of revolutions per minute, changing the driving direction, and the like is referred to as a gear coupling mechanism.

FIG. 2 is a schematic view (a) to (d) showing another embodiment of the image display device according to the present invention. Fig. 2 (a)
In this embodiment, two rotary knobs 1a are provided for each of the two extensible feet 1b at the front left and right ends of the housing bottom surface of the liquid crystal projector 1 and a total of three extensible feet 1b at the rear center. And Since it has three legs, the stability is good and the adjustment is easy.

In the embodiment shown in FIG. 2B, one extension foot 1b is provided at the center of the front side of the bottom surface of the housing of the liquid crystal projector 1 and one extension foot 1b is provided at either the left end or the right end of the rear, while the fixed foot 1b1 is provided One is provided at the other rear end of the bottom of the housing, and one rotation knob 1a is provided for each extendable foot 1b.
And the cost is low.

In the embodiment shown in FIG. 2C, one telescopic foot 1b provided at the front center of the bottom surface of the housing of the liquid crystal projector 1
The rotary knob 1a1 provided on the front upper surface of the housing is configured to rotate to expand and contract. For example, the rotary knob 1a
The gear connection mechanism can be simplified by using the same rotation axis as the vertical axis of the telescopic foot 1b.

In the embodiment shown in FIG. 2D, the rotary knob 1a2 corresponding to one telescopic foot 1b provided at the center of the front side of the bottom surface of the housing of the liquid crystal projector 1 is attached to the front wall (front panel) of the housing. A rotating ring is provided on the outer periphery of the base of the provided projection lens barrel. A neat appearance can be obtained by design.

FIGS. 3A and 3B are schematic views (a) and (b) showing another embodiment of the image display device according to the present invention. Figure 3 (a)
In the embodiment, a drive motor is installed in the housing of the liquid crystal projector 1 and a plurality of operation switches for rotating the drive motor in the normal and reverse directions are provided for each of the extendable feet to extend and retract the extendable feet in the axial direction based on the screw rotation operation. , On the upper surface of the housing.

FIG. 4 is a block diagram showing an embodiment in which a drive motor of the image display device according to the present invention is provided. The operation of the embodiment of FIG. 3A will be described with reference to the block diagram of FIG. When an instruction is input by pressing a button or the like of the switch input unit, the instruction is determined by the determination unit via the control unit. For example, an instruction to extend the telescopic leg 1b of the liquid crystal projector 1 (moving the housing upward) is determined. Then, based on this instruction, the motor driving unit generates a required current waveform and supplies the generated current waveform to the motor unit to operate the motor. The rotational driving force of the motor is transmitted to the gear (gear) connecting portion to extend the telescopic leg. This operation switch can be easily adjusted by pressing this switch. By configuring the drive motor as a pulse motor, control of one rotation or less of the motor can be easily performed, so that accurate adjustment of the amount of expansion and contraction can be expected.

In the embodiment shown in FIG. 3B, a remote control device is provided in the liquid crystal projector 1, and the drive motor is operated by an instruction from the remote control. The operation will be described with reference to the block diagram of FIG. When an instruction is input by pressing a button or the like of the remote control, the remote control receiving section demodulates the instruction code from a modulated waveform such as infrared rays, and this code is discriminated by the discriminating section via the control section. The following operation is shown in FIG.
The operation is the same as that of the embodiment (a), and a description thereof will be omitted. There is an advantage that adjustment can be performed more easily than in the other embodiments.

FIG. 5 is a schematic view showing another embodiment using a drive motor of an image display device according to the present invention. Joints in which the rotation axis of the drive motor absorbs shock, for example,
Since it is configured to be connected to the vertical axis via a coil spring or the like, the driving force of the driving motor rotates the screw gear b,
The telescopic foot 1b is expanded and contracted according to the rotation. The rotation speed of the final gear or the screw gear b is reduced by connecting the rotation shaft of the drive motor to the shaft provided with the gears and interposing a gear coupling mechanism providing at least one gear engaged with the gear, Alternatively, the rotation direction of the screw gear b may be changed, or the configuration may be such that the driving force of the rotation shaft of the drive motor installed at an arbitrary location, position, or orientation can be transmitted to the rotation axis (vertical direction) of the screw gear b. In addition, the drive motor can be freely arranged by configuring the joint with a flexible material, for example, a long coil spring or the like,
The driving force can be transmitted to the screw gear b.

[0026]

As described above, the present invention provides an image display apparatus which can easily perform horizontal adjustment and elevation angle adjustment while watching a projected image. Therefore, in the projection state, it is difficult to put a finger between the bottom surface of the liquid crystal projector 1 and the table, and it is difficult to adjust the expansion and contraction feet, so that it is difficult to perform the adjustment. There is a merit that can be adjusted. In addition, since the mechanism can be configured using a small gear of a molding material at the time of implementation, there is an advantage that it can be realized easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an image display device according to the present invention, which is an overall external view (a) and an enlarged view of a main part (b).

FIG. 2 is schematic views (a) to (d) showing another embodiment of the image display device according to the present invention.

FIGS. 3A and 3B are schematic diagrams (a) and (b) showing another embodiment of the image display device according to the present invention. FIGS.

FIG. 4 is a block diagram showing an embodiment in which a drive motor of the image display device according to the present invention is provided.

FIG. 5 is a schematic view showing another embodiment using a drive motor of the image display device according to the present invention.

FIG. 6 is a schematic diagram illustrating a state in which the liquid crystal projector enlarges and projects a projection image on a screen, and is an overall view showing a state of the projection image and an enlarged view showing expansion and contraction of a foot of the liquid crystal projector.

[Explanation of symbols]

 Reference Signs List 1 liquid crystal projector (image display device) 1a rotation knob 1a1 rotation knob 1a2 rotation knob 1b telescopic foot 1b1 fixed foot

Claims (12)

[Claims] 1. An image display apparatus such as a liquid crystal projector having a telescopic foot for elevation angle adjustment and a horizontal adjustment on a bottom surface of a housing, comprising: a plurality of telescopic feet having a cylindrical telescopic part provided with a female screw therein. A vertical axis provided with a male screw at the distal end and a gear at the other end, a rotary knob rotatably provided outside the housing, and another connected to the shaft of the rotary knob. An image display device comprising: a horizontal shaft provided with a screw gear screwed to the gear at an end; and a telescopic foot moved up and down in response to rotation of a rotary knob. 2. The image display device according to claim 1, wherein the rotation knob is provided on a side surface of the housing for each of the extendable feet. 3. The telescopic foot is positioned at the center of the front of the bottom surface of the housing.
A fixed foot is provided at the rear end of the bottom of the housing, and a rotary knob is provided for each telescopic foot. Item 2. The image display device according to Item 1. 4. A rotation knob for installing a rotation knob corresponding to one telescopic foot provided at the center of the front side of the bottom surface of the housing on the outer periphery of a base of a projection lens tube vertically provided on a front wall (front panel) of the housing. 4. The image display device according to claim 3, wherein the image display device is a ring. 5. The image display apparatus according to claim 3, wherein one extensible foot provided at the front center of the bottom surface of the casing is extended and contracted by rotating a rotary knob provided on a front upper surface of the casing. 6. The image display device according to claim 3, wherein the rotation axis of the extendable foot is the same as the rotation axis of a rotation knob provided on the front upper surface of the housing. 7. An image display device, such as a liquid crystal projector, having telescopic feet for elevation angle adjustment and horizontal adjustment on a bottom surface of a housing, wherein the plural telescopic feet include a cylindrical telescopic part provided with a female screw therein. A vertical axis provided with a male screw at the distal end to be screwed to the female screw, a drive motor having a rotation axis connected to the vertical axis, and an operation switch for inputting an operation instruction to the drive motor. An image display device characterized in that the telescopic foot is moved up and down in response to a forward / reverse rotation operation instruction. 8. The image display device according to claim 7, wherein said drive motor is constituted by a pulse motor, and fine adjustment of expansion and contraction is simplified. 9. The image display device according to claim 7, wherein a plurality of said drive motors are provided for each of the telescopic legs, and are operated by operation switches provided at one place on a housing. 10. The image display device according to claim 7, wherein a remote control device is installed on said image display device, and the drive motor is operated by an instruction from the remote control. 11. The image display device according to claim 7, wherein the drive motor and the vertical shaft are connected via a gear coupling mechanism. 12. The image display device according to claim 7, wherein the drive motor and the vertical axis are connected via a flexible joint.