KR100693415B1 - Fading shutter device for the projention television - Google Patents

Abstract

The present invention relates to a light amount control switch for securing an initial position to improve the contrast ratio in a projection TV, the yoke forming a body; A permanent magnet in which an N pole and an S pole are mounted to the yoke; A coil fixed to the hinge installed at the yoke and installed at a predetermined interval over the permanent magnet; An arm which is integral with the coil and rotates about the hinge and has a shutter installed at an end thereof; An auxiliary magnet installed between the permanent magnet and the hinge of the yoke; And an iron piece integrally formed with the coil and installed on the auxiliary magnet.

Another invention, yoke constituting the body; A permanent magnet installed in the yoke and formed to have a predetermined interval between the N pole and the S pole; A coil fixed to the hinge installed at the yoke and installed at a predetermined interval over the permanent magnet; An arm which is integral with the coil and rotates about the hinge and has a shutter installed at an end thereof; And an iron piece installed in the coil so as to be positioned at only one pole of the permanent magnet.

Light Volume Switchgear, Projection TV, Optical Tunnel Assembly

Description

Fading shutter device for projection TV {Fading shutter device for the projention television}             

1 is a light barrel assembly using a conventional light amount control switch;

Figure 2 is an enlarged view of the light amount control switch of Figure 1

3 is a rear view of the light amount control switch of FIG.

4 is a plan view of the VCM structure of the light amount control switch of FIG.

5 is a perspective view of the VCM structure according to the first embodiment of the present invention

6 is a plan view of the VCM structure of Example 1 of the present invention.

7 is a perspective view of the VCM structure according to the third embodiment of the present invention

7 is a plan view of the VCM structure of Example 3 of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: projector 20: lens

30: light control switch 31: hinge

32: stopper 33: permanent magnet N-pole

34: permanent magnet S pole 35: coil

36: shutter 37: York

38: Arm 40: Light Volume Control Switch

41: hinge 421,422: auxiliary magnet

431,432,441,442 Permanent magnets 451,452 York

46: coil 47: iron strip

50: light control switch 51: hinge

521,522,531,532: permanent magnets 541,542: yoke

55: coil 56: iron strip

60: reflector

The present invention relates to a light amount control switch for improving the contrast ratio in a projection TV, and more particularly to a light amount control switch for projection TV that can secure the initial position.

In line with the trend of DTV, which is accelerating with the recent establishment of the US transmission system, specifications of PDP / LCD and projection TV are being developed day by day.

In particular, in the process of pursuing high resolution and high contrast ratios, many technologies have been proposed to produce products that are competitively priced with simple mechanisms.

In the case of projection TV, there is an advantage that the contrast ratio can be easily improved by adjusting the amount of light projected from the projection method using a light source.

To this end, by installing a light volume control switch that adjusts the light volume control to the projection lens, the contrast ratio can be drastically improved by nearly twice.

The light quantity control switch can be driven by the VCM.

Since the light quantity control switch is only a fraction of the total cost of the projection TV, it is possible to obtain a considerable picture quality improvement effect at such a low cost.

Figure 1 shows a light tube assembly using a conventional light amount control switch 30, the light by the light source enters through the lens 20, the light amount control switch device The amount of light is adjusted through 30 to reflect to the reflector 40 to supply the projector 10.

2 is an enlarged view of the light amount control switch 30.

The yoke 37 constituting the body is installed in contact with the N-pole and the S pole of the permanent magnets (33, 34) of the fan-shaped.

In addition, the hinge 31 is provided above the yoke 37 above the permanent magnets 33 and 34.

A coil 35 moving at regular intervals directly above the permanent magnets 33 and 34 and an arm 38 integrally with the coil 35 are installed with the hinge 31 as the center of rotation.

The coil 35 forms a closed curve and forms a fan shape having a center angle smaller than that of the fan-shaped permanent magnets 33 and 34.

A shutter 36 is installed at an end of the arm 38, and a stopper 32 is installed at the yoke 37 to limit the rotation angle range of the arm 38.

3 shows a rear view of the light amount control switch 30 of FIG. 2, and shows an operating mode in which the shutter 36 opens and closes the lens 20.

4 illustrates a VCM structure for driving the light amount control switch 30.

In other words, when a current flows through the coil 35, the permanent magnets 32 and 33 receive a force to move between −θ and + θ.

The angle limit is made by the stopper 32.

Accordingly, as the coil 35 rotates, the arm 38 integrally connected to the coil 35 rotates around the hinge 31, and the shutter 36 installed at the end of the arm 38 is The amount of light is adjusted by opening and closing the lens 20.

In FIG. 4, the left view shows the shutter 36 in the open state, and the right view shows the shutter 36 in the closed state.

As described above, the contrast ratio adjustment by the light amount control switch 30 should be made actively according to the brightness of the screen. That is, in the dark screen, the amount of light is reduced to make it darker, and in the bright screen, the shutter 36 needs to be opened.

And, in the default state or the no power state, the shutter 36 must be fully opened.

However, the conventional light quantity control switch 30 has to be equipped with a separate equipment in order to satisfy these requirements, a separate power source for operating the equipment is required.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a light quantity control opening and closing device for a projection TV having a magnetic spring structure capable of stably guaranteeing the initial position of the shutter by improving the conventional light quantity control switch. Is in.

The present invention for achieving the above object, the yoke forming a body; A permanent magnet in which an N pole and an S pole are mounted to the yoke; A coil fixed to the hinge installed at the yoke and installed at a predetermined interval over the permanent magnet; An arm which is integral with the coil and rotates about the hinge and has a shutter installed at an end thereof; An auxiliary magnet installed between the permanent magnet and the hinge of the yoke; And an iron piece integrally formed with the coil and installed on the auxiliary magnet.

The auxiliary magnet is in contact with the north pole and the south pole toward one of the permanent magnets, the iron piece is provided on the central axis of the coil; The portion where the N pole and the S pole contact each other is in line with the contact portion of the permanent magnet, and the iron piece may be installed to have a predetermined distance on the central axis of the coil.

In addition, two of the same yoke in which the auxiliary magnet and the permanent magnet are installed may be installed at predetermined intervals up and down about the coil, and two iron pieces may be attached to the coil at the same position.

Another invention, yoke constituting the body; A permanent magnet installed in the yoke and formed to have a predetermined interval between the N pole and the S pole; A coil fixed to the hinge installed at the yoke and installed at a predetermined interval over the permanent magnet; An arm which is integral with the coil and rotates about the hinge and has a shutter installed at an end thereof; And an iron piece installed in the coil so as to be positioned at only one pole of the permanent magnet.

The same yoke in which the permanent magnet is installed may be installed at two spaces up and down about the coil, and two iron pieces may be attached to the coil at the same position.

Hereinafter, the present invention will be described in detail through examples and drawings.

The main feature of the present invention is a magnetic spring structure that can maintain a fixed position even in a non-powered state to secure the initial position of the light quantity control switch for improving the contrast ratio of the projection TV, to place an additional magnet near the hinge or permanent The magnets are separated by a single pole and a small iron piece is attached to the driving part where the coil is located, and the magnetic spring is formed by using align-force between them, so that the stable point of the coil is -θ side (the shutter is open). Is to be biased.

Therefore, if no current flows through the coil, the coil always moves to the initial position and maintains the state due to the alignment force described above.

Example 1

In the first embodiment, separate auxiliary magnets 421 and 422 are disposed in the VCM structure of the conventional light quantity control switch 40, and the coil 46 is disposed below and / or at a position corresponding to the gap between the auxiliary magnets 421 and 422. There is a difference attached to the iron piece 47 thereon.

FIG. 5 is a perspective view of the VCM structure of Embodiment 1 of the present invention, and FIG. 6 is a plan view showing an operating mode of Embodiment 1. FIG.

In Example 1, two yokes 451 and 452 were used up and down about the coil 46. Of course, it is also possible to use only one yoke as in the prior art, but two yokes were used to increase the alignment force described above.

The two yokes 451 and 452 are provided in contact with the fan-shaped permanent magnets 431, 432, 441 and 442. The center angles of the north pole and the south pole correspond. That is, the sizes of the north pole and the south pole are the same.

Although not shown in FIG. 5, as shown in FIG. 6, stoppers 48 are provided at both ends of the permanent magnets 431, 432, 441 and 442 to limit the angular movement range of the coil 46.

Auxiliary magnets 421 and 422 are installed between the hinge 41 and the permanent magnets 431, 432, 441 and 442 on the yokes 451 and 452.

The auxiliary magnets 421 and 422 are magnets of which the one pole of the N pole and the S pole is longer, and the portion where the N pole and the S pole contact each other is biased toward one of the permanent magnets 431, 432, 441 and 442.

The iron piece 47 is installed in the coil 46 so as to be positioned between the poles of the auxiliary magnets 421 and 422. The iron piece 47 is provided on an imaginary straight line connecting the central axis of the coil 46 and the hinge 41.

As shown in the left figure of FIG. 6, the stable state of the coil 46 is when the iron piece 47 is located at the junction of the N pole and the S pole of the auxiliary magnets 421 and 422.

Therefore, if the coil 46 is in an unstable state when the coil 46 is in a state as shown in the right figure of FIG. 6 while the power is turned off, the alignment force acts in the direction of the white arrow, and thus the coil is in a state as shown in the left figure of FIG. 6. 46 moves to achieve a stable state.

Example 2

The difference between the second embodiment and the first embodiment is that the portion where the N pole and the S pole of the auxiliary magnet are in contact with each other is installed on an imaginary straight line connecting the central axis of the coil 46 and the hinge 41, and the iron piece 47. It installs on the said virtual straight line by predetermined distance unevenly.

Thus, Example 1 and the operating mode are the same.

Example 3

Embodiment 3 has a predetermined distance between the N pole and the S pole of the permanent magnets (521, 522, 531, 532) in the VCM structure of the conventional light quantity control switch 50, the iron piece 47 is offset to the left or right of the coil 55 There is a difference.

Fig. 7 is a perspective view of the VCM structure of Example 3 of the present invention, and Fig. 8 is a plan view showing the operation of Example 3;

In Example 3, two yokes 541 and 542 were used up and down around the coil 55. Of course, it is also possible to use only one yoke as in the prior art, but two yokes were used to increase the alignment force described above.

The two yokes 541, 542 are provided with fan-shaped permanent magnets 521, 522, 531, 532 at predetermined intervals from each other. N and S poles are the same size.

Although not shown in FIG. 7, the stopper 57 is installed at both ends of the permanent magnets 521, 522, 531 and 532 as shown in FIG. 8 to limit the angular movement range of the coil 55.

And the iron piece 56 is provided so that it may be located in the left end part or right end part of the coil 55. As shown in FIG.

Therefore, the iron piece 56 is provided to be shifted by half of the width of the coil 55 on an imaginary straight line connecting the central axis of the coil 55 and the hinge 51.

As shown in the left figure of FIG. 8, the stable state of the coil 55 is when the iron piece 56 is located closest to the virtual straight line among the permanent magnets 531 and 532.

Therefore, if the coil 55 is in an unstable state as shown in the right figure of FIG. 8 while the power is turned off, the coil 55 is in an unstable state. 55 is moved to a stable state.

By securing the initial position in the non-powered state of the light volume control switch through the present invention, it is possible to prevent the initial state due to problems such as transportation of the product, even in the event of a failure of the VCM driving the shutter of the light volume control switch Maintain basic characteristics.

Claims (6)

Yoke constituting the body; A permanent magnet in which an N pole and an S pole are mounted to the yoke; A coil fixed to the hinge installed at the yoke and installed at a predetermined interval over the permanent magnet; An arm which is integral with the coil and rotates about the hinge and has a shutter installed at an end thereof; An auxiliary magnet installed between the permanent magnet and the hinge of the yoke; And Light quantity control opening and closing device for a projection TV comprising an iron piece installed to be positioned on the auxiliary magnet. 2. The light quantity control opening and closing apparatus for a projection TV according to claim 1, wherein the auxiliary magnet has a portion where the N pole and the S pole contact each other toward one of the permanent magnets, and the iron piece is provided on a central axis of the coil. The auxiliary magnet is characterized in that the portion where the N pole and the S pole contact with each other is in line with the contact portion of the permanent magnet, the iron piece is installed so as to have a predetermined distance on the central axis of the coil. Light control switch for projection TV. The same yoke in which the auxiliary magnet and the permanent magnet of any one of claims 1 to 3 are installed at predetermined intervals up and down about the coil, and two pieces of iron pieces are disposed above and below the coil at the same position. Light amount control switch for projection TV, characterized in that attached. Yoke constituting the body; A permanent magnet installed in the yoke and formed to have a predetermined interval between the N pole and the S pole; A coil fixed to the hinge installed at the yoke and installed at a predetermined interval over the permanent magnet; An arm which is integral with the coil and rotates about the hinge and has a shutter installed at an end thereof; And Light quantity control opening and closing device for a projection TV comprising an iron piece installed in the coil so as to be located only on one pole of the permanent magnet. The same yoke in which the permanent magnet of claim 5 is installed, two of which are installed at predetermined intervals up and down about the coil, and the two pieces of iron are attached to the upper and lower portions of the coil at the same position. Adjustable switchgear.

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