KR100761116B1 - Projection system - Google Patents

Abstract

A projection system is provided to control the angle of a mirror easily and prevent the angle of the mirror from being distorted by an external force, by joining the mirror to a movable portion. A projection system comprises a base, a reflection type case fixed to the base, and a folding mirror assembly(100) joined to the reflection type case. The folding mirror assembly(100) includes a cover(110) fixed to the reflection type case, a movable portion(130) shakably joined to the cover(110), and a mirror(140) joined to a front face of the movable portion(130). The projection system further comprises a plurality of screws connecting the movable portion(130) and the cover(110), and springs(120) putted on outer circumferences of the screws to prevent the shake of the movable portion(130).

Description

Projection system

1 is a partial perspective view showing an assembled state of a reflective mirror mounted to a conventional optical engine.

2 is a rear perspective view showing an optical engine unit according to the spirit of the present invention.

3 is an exploded perspective view of an optical engine unit according to the spirit of the present invention;

Figure 4 is an exploded perspective view showing a state in which the folding mirror constituting the optical engine according to the idea of the present invention is assembled to the reflectometer case.

5 is an external perspective view of the folding mirror constituting the optical engine according to the spirit of the present invention.

6 is an exploded perspective view of the folding mirror;

7 is an external perspective view of a movable part constituting a folding mirror according to the spirit of the present invention;

8 is a rear perspective view of a cover constituting the folding mirror according to the spirit of the present invention;

9 is a front perspective view of the cover;

FIG. 10 is a cutaway perspective view of the folding mirror shown in section taken along line II ′ of FIG. 5;

<Description of the symbols for the main parts of the drawings>

10: optical engine unit 20: optical engine

21: lamp assembly 22: color wheel assembly

23: light tunnel housing 24: light tunnel assembly

25 condensing lens 26 DMD assembly

27: actuator 28: reflectometer case

30: total reflection prism 31: projection lens assembly

100: folding mirror 110: cover

120: spring 130: movable part

140: mirror

The present invention relates to a projection system, and more particularly, to a mirror structure for adjusting the reflection direction of light so that light passing through the illumination system of the optical engine is accurately incident on the effective screen of the DMD panel.

Recently, large-screen high-definition display devices have emerged as a major topic, and such large-screen high-definition display devices include CRT (Cathode Ray Tube) televisions, Liquid Crystal Display (LCD) televisions, Projection televisions, and Plasma Display Panel (PDP) televisions. It's coming out.

Among them, the demand for the projection television and the development of technology are actively made as one of the display apparatuses that satisfy the requirements of large screen high definition. The projection television includes a liquid crystal on silicon (LCOS) method using an LCD and a digital light porsessing (DLP) method using a digital micromirror device (DMD).

Recently, low-cost projection TVs using LCDs or DMDs have been in the spotlight. In particular, as the consumer's desire for high quality along with a large screen increases, the demand is increasing year by year, and the trend is particularly popular in the digital television market currently being trial broadcast.

In addition, as the use of computers and presentations using computers have been increasing in recent years, the use of projectors using LCDs or DMDs has also increased.

In general, a projection television adopts a method in which light generated by an optical engine mounted inside a cabinet is reflected and an image is projected on a screen.

In detail, an optical engine using a DMD includes a lamp that emits white light, a color wheel device that separates light emitted from the lamp into red, green, and blue light, an illumination system that collects light passing through the color wheel device; And a DMD for receiving a light passing through the illumination system to create a desired screen, and a projection lens to enlarge and project the image generated from the DMD onto the screen.

In the optical engine having the above configuration, the light passing through the illumination system is reflected and incident on the effective screen of the DMD panel, and this function is performed by a reflecting device called a folding mirror.

1 is a partial perspective view showing an assembly state of a reflection mirror mounted to a conventional optical engine.

Referring to FIG. 1, in the conventional optical engine, light changed through colored wheels to colored light passes through a uniform process and then passes through the condensing lens 1 to be incident on the reflection mirror. Then, the light incident on the reflection mirror is reflected at a predetermined angle and is incident on the DMD panel 6. Then, the light is incident on the DMD panel 6 to form a desired image, and then passes through the total reflection prism 7 to be incident on the projection lens.

In detail, the reflecting mirror is fixed to a wall 4 extending vertically from the upper surface of the engine base. The reflective mirror is fixedly coupled to the front surface of the mirror supporter 3, and the fixing arm 32 extending a predetermined length from the upper surface of the mirror supporter 3 to the rear is screwed by the screw 5. It is fixed to). In addition, mirror guides 31 are formed on both side edge portions of the mirror supporter 3 so that the mirror can be slide-inserted into the front surface of the mirror supporter 3. The lower end of the mirror supporter 3 is in contact with the adjusting shaft 2 extending to a predetermined diameter and length, and the front surface of the lower end of the mirror is in close contact with the outer peripheral surface of the adjusting shaft 2. In addition, a coil spring is wound around the outer circumference of the screw 5 so that the fixed arm 32 is maintained in close contact with the head portion of the screw 5.

The angle adjustment of the conventional reflective mirror for the optical engine having the above configuration is made by tightening and loosening the screw (5).

In detail, since the fixing arms 32 are provided on both sides of the upper part of the mirror supporter 3, when the two screws 5 are tightened or loosened to the same degree, the mirror supporter 3 is moved forward with the lower end as the axis of rotation. Or inclined backwards. When only one of the screws 5 is tightened or loosened, the mirror supporter 3 rotates to the left or the right side with the adjustment shaft 2 as the rotation center, thereby allowing the angle of the mirror to be adjusted.

However, the reflective mirror having the above configuration has the following problems.

First, since the mirror attached to the front surface of the mirror supporter (3) and the control shaft (2) is in direct contact with each other, when a force of more than a predetermined amount of adjustment is applied, deviations between parts occur, and in serious cases, the mirror May occur.

Second, since the screw for adjusting the angle of the mirror is protruded out of the wall (4), the mirror is damaged or the adjustment of the mirror due to external force generated during the assembly of the other components mounted on the outside of the optical engine The problem is that the position is displaced.

Third, since the mirror is not completely in close contact with the mirror supporter, there is a disadvantage that the angle of light may be slightly changed after the angle adjustment of the mirror is completed.

Fourth, since the mirror assembly is located inside the wall, the fixed arm and the screw is located outside the wall, there is a need to disassemble the entire engine during disassembly and assembly.

Fifth, the conventional mirror structure as described above has a disadvantage in that the mirror is almost vertically erect, and therefore vulnerable to deformation after the angle adjustment of the mirror and the position after the adjustment is displaced.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide an optical engine structure that can easily adjust the angle of the mirror, and prevents the phenomenon that the angle of the mirror is distorted by an external force.

In addition, an object of the present invention is to provide an optical engine structure that can be easily disassembled and assembled without disassembling the entire optical engine, thereby increasing serviceability.

Projection system according to the present invention for achieving the above object is a base; A reflectometer case fixed to the base; A folding mirror assembly coupled to the reflectometer case; wherein the folding mirror assembly includes a cover fixed to the reflectometer case, a movable part slidably coupled to the cover, and a mirror coupled to the front surface of the movable part. Included.

In another aspect, a projection system according to the present invention comprises a mirror which allows light emitted from a lamp to be reflected by a total reflection prism; A movable part including a plurality of bosses attached to a front surface of the mirror, and including a plurality of bosses extending rearwardly at a predetermined angle from the mirror; The front cover includes a cover coupled to the movable part is swingable, characterized in that the reflection angle of the light irradiated from the lamp is variable by adjusting the angle of the movable part.

By the above configuration, there is an advantage that the assembly and the angle adjustment of the reflective mirror can be easily made in the optical engine assembly process.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

2 is a rear perspective view illustrating an optical engine unit according to the spirit of the present invention, and FIG. 3 is an exploded perspective view of the optical engine unit according to the spirit of the present invention.

2 and 3, the optical engine unit 10 according to the present invention includes a base 11, an optical engine 20 mounted on the base, and various components mounted around the optical engine 20. Is done.

In detail, the optical engine 20 includes a lamp assembly 21 in which white light is generated by a high voltage supplied from a power supply unit, and a color for separating unpolarized light emitted from the lamp assembly 21 into red, green, and blue. While passing through the wheel assembly 22, the color wheel assembly 22, and the light tunnel assembly 24 for uniformizing red, green, and blue separated light, and uniformly passing through the light tunnel assembly 24 A condensing lens 25 into which the collected light is collected, a folding mirror 29 (also called a reflecting mirror) that reflects light passing through the condensing lens 25, and the folding mirror assembly 100 A total reflection prism 30 for reflecting light reflected by the second reflection light), a DMD assembly 26 for collecting light reflected by the total reflection prism 30 to form image information, and the DMD assembly 26 half An actuator 27 for doubling and irradiating the number of pixels of light to be emitted and a projection lens 31 for enlarging the light passing through the actuator 27 are included. Here, the lamp assembly 21 is called a lamp system, and the assembly of the color wheel assembly 22, the light tunnel assembly 24 and the condensing lens 25 is called an illumination system. The aggregate of the folding mirror assembly 100 and the total reflection prism 30 is called a reflectometer, and the aggregate of the reflectometer and the DMD assembly 26 is called a synthetic system.

In more detail, the lamp assembly 21 includes a lamp 212 that emits high power white light and a lamp case 211 that protects the lamp 212. In addition, the reflector of the lamp 212 serves to change the light emitted from the burner of the lamp is reflected to focus at a certain distance, that is, the focal length.

In addition, the color wheel assembly 22 may be divided into red, green, and blue color wheels (also referred to as 221: RGB color filters) and rotate at high speed. A motor 223 driving the wheel 221 and a heat dissipation fin 222 for cooling the motor 223.

In detail, light emitted from the lamp 212 by the reflector of the lamp 212 is focused on the surface of the color wheel 221. In addition, the light collected by the color wheel 221 passes through the color wheel 221 and has any color of red, blue, and green. Here, the color wheel 221 has a disk shape having a predetermined diameter, the disk is divided into red, green, blue. Accordingly, the unpolarized light reflected by the reflector has one of red, blue, and green colors due to the color of the color wheel located at the moment of condensing.

In addition, the color wheel assembly 22 and the light tunnel assembly 24 are housed inside the light tunnel housing 23.

In addition, the light tunnel assembly 24 is also called a rod lens, and serves to uniformly make colored light passing through the color wheel 221.

In detail, the light tunnel assembly 24 is formed by joining four small, long rectangular bar mirrors facing each other. The light passing through the color wheel assembly 22 is diffusely reflected while passing through the light tunnel, and the brightness distribution is uniform.

In addition, the condensing lens 25 performs a function of collecting red, green, and blue light uniformed while passing through the light tunnel assembly 24 to the DMD panel constituting the DMD assembly 26. do.

The total reflection prism 30 may also be referred to as a total internal reflection (TIR) prism, and a prism having a large refractive index and a prism having a relatively small refractive index are bonded to each other. The light irradiated from the condensing lens 25 is totally reflected or transmitted according to the incident angle due to the difference in refractive index.

In detail, each object has its own refractive index, and the difference in refractive index determines the critical angle at which light is totally reflected or transmitted. Therefore, light incident at an angle greater than or equal to the critical angle is totally reflected by the total reflection prism 30, and light incident at an angle smaller than or equal to the critical angle passes through the total reflection prism 30.

In addition, the DMD assembly (Digital Micro-mirror Device Assembly) 26 is composed of a DMD panel 33 (see FIG. 7) and a driver board in which the DMD panel 33 is accommodated. In detail, the driver board is a device for controlling the driving of the ballast and the color wheel or controlling the image.

On the other hand, the DMD panel 33 is designed so that a minute mirror of the same amount as the resolution of the display is arranged so as to have a one-to-one correspondence with the screen.

In detail, the DMD panel 33 determines whether the red, green, and blue light transmitted through the total reflection prism 30 is to be directed toward the screen or discarded out of the screen. The DMD panel 33 is mounted in a complementary metal oxide semiconductor (CMOS) memory and driven by a signal transmitted from the CMOS memory.

In more detail, the micromirror constituting the DMD panel 33 is manufactured in the form of a fine diamond-shaped pixel of 16 μm in width and length, and tilted by ± 10 degrees according to a signal transmitted from the CMOS, so that the total reflection prism ( Light passing through 30 is reflected toward the screen or thrown out of the screen.

In addition, the actuator 27 is disposed between the DMD panel 33 and the projection lens assembly 31, and a mirror is mounted at the center portion. In detail, the actuator 27 performs a double doubling of the number of pixels of the image signal by dividing the image signal emitted from the DMD panel 33 by half a frame. Due to the refraction characteristics of the mirror, the resolution of the screen is increased. In addition, the actuator includes a transmission type and a reflection type.

In addition, the projection lens assembly 31 functions to enlarge the image passing through the actuator 27 toward the rearview mirror 3.

In the optical engine 20 having the above configuration, the actuator 27, the total reflection prism 30, and the folding mirror assembly 100 are inserted from different surfaces of the reflectometer case 28. Configure the reflectometer. The color wheel assembly 22 and the light tunnel assembly 24 are accommodated in the light tunnel housing 23 to constitute another assembly. In addition, the lamp assembly 21 forms a separate assembly together with the lamp 212 mounted inside the lamp case 211, and the light tunnel housing 23 is in close contact with the front of the lamp assembly 21. do.

As described above, since a plurality of parts form a single assembly, there is an advantage that parts replacement and service are easily performed.

4 is an exploded perspective view showing a state in which a folding mirror constituting an optical engine according to the spirit of the present invention is assembled to a reflectometer case.

Referring to FIG. 4, in the optical engine 20 according to the present invention, as described above, the folding mirror assembly 100, the actuator 27 and the total reflection prism 30 are different from each other in the reflectometer case 28. It is inserted from the side.

In detail, the folding mirror assembly 100 and the actuator 27 and the total reflection prism 30 do not form a coupling structure with each other, but are coupled only to the reflectometer case 28. Therefore, in order to disassemble each part accommodated in the reflector case 28, only the selected part can be disassembled and assembled without affecting the assembly state of other parts.

On the other hand, the folding mirror assembly 100 is inserted from the side of the reflector case 28, the direction in which the folding mirror assembly 100 is drawn out and the light path of the light passing through the condensing lens 25 and Withdrawn or inserted in the same direction. Then, the light passing through the condensing lens 25 is reflected upward by a mirror (to be described later) mounted on the folding mirror assembly 100 to strike the refractive surface of the total reflection prism 30. The light hitting the refracting surface is totally reflected and collected on the DMD panel, and the collected light is taken or discarded in the DMD panel to obtain a desired shape. Here, by accurately adjusting the angle of the mirror mounted on the folding mirror assembly 100, the light totally reflected by the total reflection prism 30 is accurately illuminated on the effective screen of the DMD panel.

Hereinafter, a structure and an angle adjusting method of the folding mirror will be described in more detail with reference to the accompanying drawings.

5 is an external perspective view of a folding mirror constituting the optical engine according to the inventive concept, and FIG. 6 is an exploded perspective view of the folding mirror.

5 and 6, the folding mirror assembly 100 according to the present invention includes a cover 110, a movable part 130 coupled to the front surface of the cover 110 so as to be swingable, and the movable part 130. Mirror 140 is tightly coupled to the front of the intervening between the movable portion 130 and the cover 110, the spring 120 to prevent the shaking of the movable portion 130 is included.

In detail, the mirror 140 is in close contact with the front surface of the movable part 130 by an adhesive member and at the same time the left and right swings are prevented by the guide. In addition, the movable part 130 should not be twisted by external vibration or shock or external force after the angle adjustment is made. This allows the movable part 130 to be firmly fixed to the cover 110 by the spring 120. That is, since the movable portion 130 receives an appropriate pressure by the elastic force of the spring 120, after the angle adjustment of the movable portion 130 is completed, the movable portion 130 is not oscillated by vibration or the like. Hereinafter, the structure and function of each part of the folding mirror assembly 100 will be described in detail with reference to the accompanying drawings.

7 is an external perspective view of a movable part constituting the folding mirror according to the spirit of the present invention.

Referring to FIG. 7, the movable part 130 constituting the folding mirror assembly 100 according to the present invention extends from a mirror seating portion 131 on which the mirror 140 is seated, and a bottom surface of the mirror seating portion 131. And a boss portion fitted to the cover 110.

In detail, the boss portion has a left and right adjustment boss 135 that can adjust the left and right direction angle of the mirror 140, a vertical adjustment boss 134 and the adjustment boss that can adjust the vertical angle of the mirror 140. The fixing boss 133 which becomes the rotation center in the angle adjustment process of 134 and 135 is included.

In more detail, at least one or more mirror guides 132 extend to the edge portion of the mirror seating portion 131, so that the coefficient of thermal expansion of the mirror 140 and the mirror seating portion 131 in the state where the mirror 140 is seated. Damage to the mirror 140 due to the difference is prevented.

In addition, at least one mounting protrusion 136 in close contact with the bottom surface of the mirror 140 is formed at a predetermined width and length on the upper surface of the mirror seating portion 131. In addition, an elastic adhesive bond is applied around the seating protrusion 136, so that the mirror 140 is firmly coupled to the mirror seating portion 131. In addition, the adhesive bond is made of a material having a predetermined elastic force after solidification. Therefore, even if the mirror 140 and the mirror seating portion 131 are expanded by the high temperature light emitted from the lamp 122, the phenomenon in which the adjustment angle of the mirror 140 is distorted is reduced.

8 is a rear perspective view of the cover constituting the folding mirror according to the spirit of the present invention, Figure 9 is a front perspective view of the cover.

8 and 9, a left boss 111 protruding to a predetermined length from the front lower end of the cover 110 constituting the folding mirror assembly 100 according to the present invention, and straight from the left boss 111. A right boss 112 protruding at a distance is formed. The upper and lower adjustment grooves 113 and the fixing holes 114 are formed in the left boss 111, respectively, and the left and right adjustment grooves 115 are formed in the right boss 112. In addition, the upper and lower adjustment grooves 113 and the left and right adjustment grooves 115 are formed with through holes through which the screws pass. Therefore, the screw is inserted through the fixing hole 114 and the through hole, the angle of the mirror is adjusted by the tightening and loosening operation of the screw.

In addition, screw grooves 116 are formed on the rear surfaces of the upper and lower adjustment grooves 113, the fixing holes 114, and the cover 110 corresponding to the left and right adjustment grooves 115, respectively. In detail, the screw groove 116 is formed to be recessed a predetermined depth into the cover 110, so that the head portion of the screw to be inserted is not exposed to the outside. Therefore, since the optical engine 20 is not affected by the external force during the assembly process, the phenomenon in which the mirror 140 is distorted does not occur.

In addition, the vertical adjustment boss 134 is inserted into the vertical adjustment groove 113, the left and right adjustment boss 135 is inserted into the left and right adjustment groove 115. In addition, an end portion of the fixed boss 133 is seated in the adjustment hole 114. Here, the fixed boss 133 is not inserted into the left boss 111 and is seated in the fixed hole 114 because the fixed boss 133 performs a central axis function. Detailed reasons for this will be described with reference to the accompanying drawings.

On the other hand, the screw is inserted through the screw groove 116 formed on the rear surface of the cover 110, the screw is inserted through the boss members (133, 134, 135). Then, the spring 120 having a predetermined elastic force is fitted to the outer circumference of the boss (133, 134, 135).

Hereinafter, a method of adjusting the angle of the mirror 140 of the folding mirror assembly 100 will be described with reference to the drawings.

FIG. 10 is a cutaway perspective view of the folding mirror showing a cross section taken along the line II ′ of FIG. 5.

Referring to FIG. 10, the folding mirror assembly 100 is inserted and fixed to one side of the reflectometer case 28, and the DMD assembly 16 is positioned on the side of the folding mirror assembly 100. The DMD panel 261 is attached to the DMD assembly 16. Accordingly, the light reflected by the folding mirror assembly 100 is totally reflected by the total reflection prism 30 and condensed on the DMD panel 261.

In addition, the cover 110 and the movable unit 130 of the folding mirror assembly 100 is coupled by a screw. In detail, a screw is inserted through a screw groove 116 recessed on the rear surface of the cover 110, and the fixing boss 133 has a shape in which a head portion is curved at a predetermined curvature as shown in the fixing boss 133. Is inserted. In addition, the screw head support surface 111a in contact with the head of the fixing screw 160 is also curved with the same curvature as the head.

On the other hand, the adjustment screw 150 is inserted into the upper and lower adjustment boss 134 and the left and right adjustment boss 135 forms a dish head shape as shown in the head portion. In addition, the screw head support surface 112a in contact with the head of the adjustment screw 150 forms a conical shape with an end cut as shown.

This is to allow the fixing screw 160 to be smoothly rotated when the movable part 130 swings in the process of adjusting the mirror angle by tightening and loosening the adjusting screw 150. In detail, the fixing boss 133 and the fixing screw 160 of the movable unit 130 are moved in one body. Therefore, when the movable unit 130 rotates in the vertical direction or the left and right directions, the fixing screw 160 also rotates together. Therefore, the head portion of the fixing screw 160 is curved by a predetermined curvature, so that the screw head portion is smoothly rotated in a state where the screw head support surface 111a is not damaged.

In addition, since the fixed boss 1333 is not inserted into the left boss 111 and maintains a state of being in close contact with the upper surface, even if the movable part 130 is twisted back and forth or left and right, the fixed boss 133 is It will not break.

Referring to the mirror angle adjustment process of the folding mirror assembly 100 having the above configuration, the assembler or serviceman using the tool such as a driver from the outside of the optical engine unit 10, the screw groove 116 ).

In detail, in order to adjust the left and right angle of the mirror 140, the adjustment screw 150 inserted into the left and right adjustment boss 135 is rotated. Then, the adjustment screw 150 is rotated only in the original position, the left and right adjustment boss 135 is raised or lowered. At this time, the adjustment screw 150 is not oscillated by the elastic force of the spring 120 fitted to the outer circumference of the left and right adjustment boss 135.

In addition, in order to adjust the vertical angle of the mirror 140, the adjustment screw inserted into the vertical adjustment boss 134 may be rotated in the same manner. In this angle adjustment process, since the fixing screw 160 is not manipulated, only the predetermined angle is rotated in the vertical direction or the left and right directions.

As described above, by the folding mirror structure according to the present invention, the assembler or the serviceman does not need to disassemble the whole optical engine for adjusting the mirror angle of the folding mirror, but only inserts a screwdriver to turn the screw from the outside of the engine There are advantages to doing this. In addition, since the structure for adjusting the angle of the mirror is not exposed to the outside, it is recessed, and thus, a phenomenon in which it is hit in the assembling process of other parts is eliminated, and thus a distortion phenomenon after the angle is prevented.

By the projection system according to the present invention constituting the above configuration, there is an advantage that the assembly and the angle adjustment of the reflection mirror in the optical engine assembly process can be easily made.

In addition, since the operation unit for adjusting the angle of the reflective mirror is not exposed to the outside, the angle is not changed or the mirror is broken by an external force after the angle adjustment.

Further, in order to disassemble the reflection mirror from the optical engine assembly, there is no need to separate the entire optical engine, so that the service has an effect of increasing efficiency.

In addition, since the angle adjusting structure of the reflective mirror is improved, the angle of the mirror does not change even after the angle adjustment, and the light passing through the light tunnel and the condensing lens is accurately incident on the effective screen of the DMD panel.

In addition, the mirror fixing structure according to the present invention has the effect that the mirror damage due to the difference in the coefficient of thermal expansion of the mirror and the support is eliminated.

Claims (13)

Base; A reflectometer case fixed to the base; And a folding mirror assembly coupled to the reflectometer case. The folding mirror assembly includes a cover fixed to the reflector case, a movable part slidably coupled to the cover, and a mirror coupled to a front surface of the movable part. The method of claim 1, And a plurality of screws connecting the movable part and the cover and a spring inserted into an outer circumference of the screw to prevent the movable part from shaking. The method of claim 2, Any one of the plurality of screws is the axis of rotation of the left and right or vertical direction of the movable portion, The rest of the projection system, characterized in that the inclination angle of the movable portion is adjusted by rotation. The method of claim 1, The mirror is bonded to the front of the movable portion, At least one mirror guide protrudes from the front edge of the movable part. The method of claim 1, And a front surface of the movable part to which the mirror is attached is formed to be inclined at a predetermined angle. A mirror for reflecting light emitted from the lamp to the total reflection prism; A movable part including a plurality of bosses attached to a front surface of the mirror, and including a plurality of bosses extending rearwardly at a predetermined angle from the mirror; The front cover includes a cover coupled to the movable part, Projection system, characterized in that the reflection angle of the light irradiated from the lamp is variable by adjusting the angle of the movable part. The method of claim 6, The plurality of bosses and the fixed boss to be a rotating shaft of the movable portion, Vertical adjustment boss for adjusting the vertical direction of the movable portion, A left and right adjustment boss for adjusting the left and right directions of the movable part is included, And a screw is inserted into the plurality of bosses from the rear surface of the cover. The method of claim 7, wherein The head portion of the screw inserted into the fixed boss is curved to a predetermined curvature, Projection system, characterized in that the head portion of the screw inserted into the upper and lower and left and right adjustment boss is conical shape. The method of claim 7, wherein Projection system, characterized in that for rotating the fixed boss up and down or left and right in accordance with the rotation of the screw inserted into the upper and lower or left and right adjustment boss. The method of claim 7, wherein And the head of the screw is recessed a predetermined depth from the back of the cover. The method of claim 7, wherein Projection system, characterized in that the spring having a predetermined elastic force is fitted to the plurality of boss outer periphery. The method of claim 7, wherein Projection system, characterized in that at least one boss extending the front of the cover for receiving the plurality of bosses. The method of claim 12, A portion of the left and right or up and down adjustment boss is inserted into the boss extending to the cover.

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