KR100252018B1 - Lamp assembly of projection tv - Google Patents

Abstract

PURPOSE: A lamp assembly of a projection TV is provided to block a lamp case to be broken down in case a lamp assembly is hot by equipping with a locking apparatus in a lamp assembly. CONSTITUTION: A hanging hole(30) is formed in a contact surface of a lamp holder(19) and a lamp case(18). A hanging member(40) is connected with the hanging hole(30) and performs a locking and unlocking function. The hanging member(40) is equipped with a long hole(41) with an appointed length to be connected with a guide roller(42). The hanging member(40) has a rack(43) in one level, a hanging groove(44) in the other level, and a projection(45) in the end level. A stopper groove(46) formed in a level of the hanging member(40) controls a linear motion of the hanging member(40). A driving motor(31) is set in a rear side of a lamp assembly. A gear(32) is connected with the driving motor(31) and transfers a driving power of the driving motor(31) to the rack(43) in the hanging member(40). A temperature sensor(33) is set in a side of the lamp assembly and senses a surface temperature of the lamp assembly to control a static rotation of the driving motor(31). A stopper in an upper level of the stopper groove(46) senses a location of the stopper groove(46) and controls a movement of the hanging member(40).

Description

Lamp assembly of the projection TV

The present invention relates to a lamp assembly of a projection TV using an actuated mirror array, and more particularly to a locking device installed in the lamp assembly.

In general, a device for projecting optical energy onto a screen includes a direct-view image display device and a projection-type image display device according to a method of displaying optical energy on a screen. type image display device).

An example of a direct-view image display apparatus is a cathode ray tube (CRT), which is a so-called CRT device, which has excellent image quality but increases in weight and volume as the size of the screen increases, leading to an increase in manufacturing cost. There is.

Projection-type image display devices are referred to as liquid crystal displays (hereinafter referred to as LCDs), deformable mirror devices (hereinafter referred to as DMDs), and actuated mirror arrays (hereinafter referred to as AMAs). ).

Since the LCD has a very simple optical structure, it can be thinly formed to reduce the weight and the volume. However, due to the polarity of light, the light efficiency is low, and there is a problem inherent in the liquid crystal material, for example, a slow response speed and a disadvantage in that the inside is easily overheated. In addition, the maximum light efficiency of existing transmission light modulators is limited to a range of 1-2% and requires dark room conditions to provide acceptable display quality.

Optical modulators such as DMD and AMA have been developed to solve the problems of the aforementioned LCD type optical modulators.

DMD shows a relatively good light efficiency of about 5%, but serious fatigue problems are caused by the hinge structure employed in the DMD. In addition, there is a disadvantage that a very complicated and expensive driving circuit is required.

In contrast, AMA is a piezoelectrically driven mirror array that provides light efficiency of 10% or more. In an AMA light modulator, each actuator generates a deformation in accordance with an electric field generated by an applied electric image signal and a bias voltage. When the actuator causes deformation, the respective mirrors mounted on the actuator are inclined to reflect the light incident from the light source at a predetermined angle.

The AMA optical modulator has a simple structure and operation principle, and can obtain high light efficiency compared to LCD or DMD. It also provides enough contrast to provide a bright and clear image under normal room temperature light conditions. Moreover, it is not only affected by the polarity of the incident light, but also by the polarity of the reflected light. In addition, the reflective properties of the AMA are relatively less sensitive to temperature, which has the advantage of improving the brightness of the screen compared to other devices that are easily affected by high power light sources.

Such a projection TV using AMA is disclosed in Korean Utility Model Application No. 96-19194 filed by the present applicant on June 29, 1996.

1 is a schematic cross-sectional view showing a projection TV filed by the applicant.

As shown, the conventional projection TV is provided with a screen 11 on the front of the cabinet 10, the rear cover (rear cover 12) is mounted on the back of the cabinet (10).

In addition, a projector 13 for projecting light is provided under the cabinet 10, and a main mirror 14 for reflecting light projected from the projector 13 is inclined at a predetermined angle to cover the rear cover 12. Is mounted on.

The light reflected by the reflection of the main mirror 14 is projected onto the screen 15 of the cabinet 10 as an image.

On the other hand, a lamp assembly 11 for supplying high brightness light is installed on the side of the projector 13, Figure 2 is a cross-sectional view showing a conventional lamp assembly, the lamp assembly 11 is a lamp 16 The built-in lamp case 18 and the lamp holder 19 make it easy to attach and detach the lamp case 18. Reference numeral 20 is a handle.

However, the conventional lamp assembly 11 as described above generates considerable heat in the process of supplying high brightness light, and in such a state, the lamp case is pulled by pulling the handle 20 of the lamp case 18 for lamp replacement. If a part of the body comes into contact with (18), there is a risk of burns. In particular, since the high heat generating lamp 16 is built into the lamp case 18 and thus is not visible, the user may unconsciously notice that the lamp 16 is in a high temperature state and replace the lamp 16 without notice. Are generated.

Accordingly, an object of the present invention is to provide a lamp assembly provided with locking means for suppressing detachment of the lamp case when the lamp assembly is heated in a state of supplying heat of high brightness. have.

In order to achieve the above object, the present invention provides a projector of a projection TV having a lamp assembly for supplying light of high brightness, wherein a driving motor is installed at one end of a lamp holder of the lamp assembly, and a driving force of the driving motor is provided. The transmission gear is installed, the locking member linearly moved by the rack engaged with the gear is installed, the temperature sensor for controlling the forward and reverse rotation of the drive motor is installed, for limiting the linear movement of the locking member A stopper is installed, and a locking hole into which the locking member can be inserted is formed in the lamp case and the lamp holder.

According to the present invention having such a structure, heat generated in the process of supplying high-brightness light in the lamp assembly is transferred to the lamp holder, and when the temperature sensor detects a predetermined temperature or more, the driving motor drives the rack to rotate the gear by the torque The locking member is inserted into the locking hole to move the locking member along the lock position. At this time, the stopper stops the movement of the locking member when the movement of the locking member to the locked state is completed.

Therefore, when the lamp assembly maintains a high temperature with heat generated in the process of supplying high brightness light, the lamp case is not detached even if a user or a serviceman pulls out to remove the lamp case, so that the user unconsciously heats the lamp assembly. It can help prevent the risk of touching your hands.

On the other hand, when the projection TV is prevented from being stopped for a certain time, the temperature of the lamp assembly is lowered, and the temperature sensing sensor detects this and drives the driving motor to move in the direction in which the locking member inserted in the locking hole is released. The stopper also stops the movement of the locking member when the movement to the state where the locking member is completely released is completed. Therefore, when the user pulls the lamp case in a state where the temperature of the lamp assembly is lower than the predetermined temperature, the lamp case is separated smoothly and proceeds with disassembly.

1 is a schematic cross-sectional view showing the structure of a conventional projection TV;

2 is a cross-sectional view showing a conventional lamp assembly structure,

Figure 3 is a cross-sectional view showing a lamp assembly structure in the present invention.

<Explanation of Signs of Major Parts of Drawings>

10; Cabinet 11; screen

12; Rear cover 13; Projector

14; Mirror 15; Lamp assembly

16; Lamp 18; Lamp case

19; Lamp holder 20; handle

30; Engaging hole 31; Drive motor

32; Gear 33; Temperature sensor

34; Stopper 40; Locking member

41; Long hole 42; Guide roller

43; Rack 44; Home

45; Protrusion 46; Stopper home

Hereinafter, preferred embodiments of the lamp assembly of the projection TV according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing a coupling structure of a lamp assembly according to the present invention, the basic configuration of the projector described in Figure 1 will be described with the same reference numerals.

First, referring to FIG. 1, in the projection TV, a screen 11 is installed at the front of the cabinet 10, and a rear cover 12 is mounted at the rear of the cabinet 10.

In addition, a projector 13 for projecting light is provided under the cabinet 10, and a main mirror 14 for reflecting light projected from the projector 13 is inclined at a predetermined angle to cover the rear cover 12. Is mounted on.

On the other hand, a lamp assembly 15 for supplying high-brightness light is provided on the side of the projector 13, the lamp assembly 15 is a lamp case 18 and a lamp holder 19 incorporating a lamp 16 Is done.

The lamp holder 19 is fixed to the inside of the cabinet 10 by a fastening means such as a screw, the lamp case 18 is installed to be accommodated in the lamp holder 19, the handle 20 is formed on the front. .

In particular, as a characteristic element of the present invention, the engaging hole 30 is formed in each of the rear surface in which the lamp holder 19 and the lamp case 18 are in contact with each other, and is coupled with the engaging hole 30 While the linear reciprocating motion is provided with a locking member 40 capable of locking and releasing action.

The engaging member 40 is formed with a long hole 41 having a predetermined length to enable a linear movement, the long hole 41 is coupled to the guide roller 42 fastened to the rear of the lamp assembly (15). One end of the locking member 40 is formed with a rack 43, the other end is extended to form a locking groove 44 of the sum of the thickness of the lamp holder 19 and the lamp case 18, the end is perpendicular Protruding to the projection 45 is formed. In addition, a stopper groove 46 is formed at one end of the locking member 40 to control the linear movement of the locking member 40.

On the other hand, a drive motor 31 is installed on the rear of the lamp assembly 15, the driving force of the drive motor 31 to reduce the driving force to a predetermined number of revolutions for transmitting to the rack 43 of the locking member 40 Gear 32 is engaged with the drive motor 31 is installed.

In addition, the temperature sensor 33 for controlling the forward and reverse rotation of the drive motor 31 by sensing the surface temperature of the lamp assembly 15 is installed at one end of the lamp assembly 15, the stopper groove 46 A stopper 34 for limiting the movement of the locking member 40 by sensing the position of the stopper 34 is installed at the top of the stopper groove 46.

Here, the long hole 41 and the guide roller 42 is preferably installed in two or more places for the stable linear motion of the locking member 40, so that the linear movement of the locking member 40 can be repeated smoothly. The width of the stopper groove 46 is preferably formed to be similar to or slightly narrower than the margin width of the engaging hole 30 and the length of the long hole 41 remaining after the engaging member 40 is inserted.

Hereinafter, the operational effects according to the present invention will be described.

The driving force of the driving motor 31 is adjusted to have a predetermined driving force and rotational speed through the gear 32 and is transmitted to the rack 43 of the locking member 40, whereby the locking member 40 makes linear movement. The thickness of the lamp holder 19 and the lamp case 18 is inserted into or detached from the locking groove 44 of the locking member 40 to lock.

That is, when the heat generated in the process of supplying high-brightness light from the lamp assembly 15 is transferred to the lamp case 18 and the lamp holder 19 so that the temperature detected by the temperature sensor 33 exceeds the set temperature. The drive motor 31 is driven in one of the forward and reverse directions.

The driving force of the driving motor 31 is transmitted to the gear 32 and is adjusted to a predetermined driving force and rotational speed to be transmitted to the rack 43 in a linear motion, and the movement of the rack 43 is stopped along the long hole 41. The locking groove 44 is positioned at the thicknesses of the lamp holder 19 and the lamp case 18 by moving the 40. At the same time, as the stopper groove 46 moves together with the movement of the locking member 40, one end of the stopper groove 46 is sensed by the stopper 34 to block the driving force of the driving motor 31, thereby further moving. Do not make it happen.

In such a state, the thickness of the lamp holder 19 and the rear surface of the lamp case 18 is inserted into the locking groove 44 so that the lamp case 18 can be detached even if a user or a serviceman pulls the handle of the lamp case 18. This will not be done. Therefore, the possibility of a user or a maintenance worker touching the lamp case 18 in a hot state is prevented beforehand.

On the other hand, when the temperature of the lamp assembly 15 is lowered below the set temperature after a certain time, the temperature sensor 33 detects this and drives the driving motor 31 in the opposite direction to the above-described direction.

As described above, the driving force of the driving motor 31 is transmitted to the gear 32 and adjusted to a predetermined driving force and rotational speed to be transmitted to the rack 43 in a linear motion, and the movement of the rack 43 is stopped by the locking member ( 40 to move back the locking groove 44 caught in the thickness of the lamp holder 19 and the lamp case 18. As the stopper groove 46 is also moved together, the other end of the stopper groove 46 is sensed by the stopper 34 to block the driving force of the driving motor 31 so that no further movement is made. Therefore, when the user or the operator pulls the handle of the lamp case 18, since the locking member 40 is released, the detachment of the lamp case 18 can be smoothly performed, and thus the disassembly and replacement can be performed.

The above embodiments are merely illustrative of one preferred embodiment of the present invention, and the scope of the present invention is not limited to the above, and may be appropriately changed within the scope of the same idea.

Therefore, according to the present invention, by providing a locking device at one end of the lamp assembly, when the lamp assembly is in a hot state, the disassembly of the lamp case may be blocked to obtain an effect of preventing a safety accident of a user or a maintenance worker.

Claims (4)

In a projector of a projection TV having a lamp assembly for supplying high-brightness light, a drive motor is installed at one end of the lamp assembly, a gear for transmitting a driving force of the drive motor is installed, and a rack engaged with the gear. The locking member is installed by the linear motion, a temperature sensor for controlling the forward and reverse rotation of the drive motor is installed, a stopper for limiting the linear motion of the locking member is installed, the locking member is caught in the lamp case and the lamp holder A lamp assembly of a projection TV, characterized in that a locking hole is formed in which a member can be inserted. The method of claim 1, wherein the engaging member 40 is formed with a long hole 41 having a predetermined length to enable a linear movement, the long hole 41 is a guide roller fastened to the rear of the lamp assembly ( It is coupled to 42, one end of the locking member 40 is formed with a rack 43, the other end is extended so that the locking groove 44 is formed and the end is projected in a direction perpendicular to the protrusion 45 is formed, A lamp assembly of the projection TV, characterized in that a stopper groove (46) is formed at one end of the locking member (40) to limit linear movement. 3. The lamp assembly of claim 2, wherein the long hole (41) and the guide roller (42) are installed at two or more places for stable linear motion of the locking member (40). The width of the stopper groove 46 is characterized in that the width of the stopper groove 46 is formed to be similar to or slightly narrower than the margin width of the retaining hole 30 and the length of the long hole 41 remaining. Lamp assembly of the projection TV.

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