Abstract: An exemplary metallic cover (20) includes a bottom base (21) and a plurality of side walls (22, 23, 24, 25). The side walls extend from bottom base. The bottom base and each of the side walls are connected by an edge structure (26). The metallic cover is made of a metallic material that has a yield strength in the range from about 80 MPa to about 150 MPa, an elongation ratio in the range from about 15% to about 28%, and a hardness in the range from about 45 HV0.2 to about 70 HV0.2. A method for making the metallic cover is also provided.

Abstract: A projection apparatus for a vehicle of the present invention includes a projector for projecting an image onto a screen, a support bracket supporting the projector, a frame attached to a ceiling of the vehicle, and a vibration absorber arranged between the support bracket and the frame. The vibration absorber includes a plurality of wire ropes for absorbing multidirectional vibrations transmitted from the vehicle through the frame to the projector. Accordingly, this prevents the projector from shaking so that passengers can comfortably watch video content, and also reduces the incidence of breakage of components of the projector, thereby prolonging the lifetime of the projector.

Abstract: A multi-direction image viewing system includes a triangular or rectangular image case, and plural projectors symmetrically installed to the inner sides of the image case in three or four directions. Projecting light paths cross each other so that the size of the image case is reduced to 1/6.7 to ? of the size of the conventional image case. By reducing the weight of the image case through size reduction, the multi-direction image viewing system can serve as a mobile multi-direction image viewing system coupled with a trailer and transported by a small sized vehicle such as a motorcycle, as a wide viewing angle multi-direction image system attached to a wall and coupled with the safety fence of the bus terminal or the subway station, and as an image viewing system mounted to a ceiling or wall.

Abstract: An apparatus for concealing a light emitting video display mounted to a vertical surface by reflecting incident ambient light in mirror-like fashion. The apparatus includes a perimeter structure, which is positioned adjacent to the vertical surface about the video display. The perimeter structure has a front opening for enabling visual access to the video display. A beam-split film is disposed within the front opening, and has the characteristics of partial transmission of the light emitted by the video display and partial reflection of the incident ambient light. A fan is disposed to circulate air adjacent to the video display, and a light baffle is disposed about the perimeter structure for enabling circulation of ambient air through the perimeter structure while preventing the transmission of ambient light into the perimeter structure.

Abstract: An image projection apparatus includes: an imaging portion that takes an image of an object; an optical element that is disposed halfway on an optical path between the object and the imaging portion, and that branches the optical path; a projection portion that projects image light onto the object through the optical element; a dust prevention cover that includes an opening on an optical axis between the object and the optical element, and that covers at least the optical element to protect the optical element from dust; and a transparent dust prevention member that is provided in the dust prevention cover to close the opening, and that has a reflection surface preventing reflection light, which is obtained by receiving the image light from the projection portion and reflecting the image light, from being incident on an entrance pupil of the imaging portion.

Abstract: A video reproducing apparatus which comprises a radio control signal receiving portion, a video sound data reproducing portion connected to the radio control signal receiving portion, a video projection portion connected to the radio control signal receiving portion and the video sound data reproducing portion, speakers connected to the video sound data reproducing portion, a housing for accommodating the video sound data reproducing portion, the video projection portion, and the speakers, and a housing drive portion for moving the housing, and which drives the housing according to a control signal of the housing drive portion which controls the housing drive portion and which is received by the radio control signal receiving portion, projects the video sound data onto the video projection portion according to a control signal of the video sound data reproducing portion at an arbitrary position, and reproduces the data through the speakers.

Abstract: A television image receiver (1) includes: an internal pressure regulating valve (5) provided above a tightly sealed cabinet (2), for allowing ventilation inside and outside the cabinet (2); and moisture adjusters (7), each having a moisture absorbing function, fixed inside the cabinet (2). The internal pressure regulating valve (5) includes a ventilation filter (6), which allows air and water vapor to pass therethrough but prevents water from permeating therethrough, inside a valve body (50). The internal pressure regulating valve (5) alleviates change in pressure inside the cabinet (2). Water vapor outside the cabinet (2) enters the cabinet (2) through the internal pressure regulating valve (5). When a temperature inside the cabinet (2) is decreased, the moisture adjuster (7) absorbs the water vapor to decrease the relative humidity, thus preventing occurrence of condensation.

Abstract: A projection display apparatus (1) includes slide bases (106) which are able to protrude from a housing (101). A screen unit (103) is supported by rotation plates (107) rotatably provided on the slide bases (106). The attaching and detaching operations of the screen unit (103) can be performed in a state where the slide bases (106) protrude from the housing (101) and the rotation plates (107) rotate to an operating position. In this operating position, the screen unit (103) is supported by the rotation plates (107) from below, so that the screen unit (103) can be prevented from being dropped on the floor, and therefore the reliability of the operations can be enhanced.

Abstract: A screen assembly for a projection television includes a screen panel, a lenticular screen and a Fresnel screen. The screen panel is attached directly to the television cabinet and sandwiches the Fresnel and lenticular screens therebetween. The screen panel projects laterally beyond the lenticular and the Fresnel screens and a recess may be provided in the television cabinet to receive the Fresnel and lenticular screens, so that the screen protection panel overlaps the front face of the cabinet sidewalls. In an exemplary embodiment, decorative bolts pass through the screen panel to secure the screen panel to the cabinet.

Abstract: A projection apparatus including a projection unit, a control unit, a case, and a movable signal receiving module is provided. The projection unit is suitable to project an image beam onto a screen. The control unit is electrically connected to the projection unit, and the control unit is suitable to control the projection unit. The projection unit and the control unit are packaged by the case. In addition, the movable signal receiving module disposed outside the case includes a signal receiving unit and a signal transmission line. The signal receiving unit is suitable to receive a signal from a remote controller. One end of the signal transmission line is connected to the signal receiving unit and the other end is suitable to be electrically connected to the control unit. Moreover, the signal received by the signal receiving unit is transmitted to the control unit through the signal transmission line.

Abstract: A handy image projection apparatus is disclosed in which the relationship between the gravity center position thereof and the position of an operation member is appropriately set. The apparatus includes a main body which projects an image from its front part, and an operation member which is provided on an outer face of the main body. At least part of the operation member is disposed, in a front-rear direction of the apparatus, at one of a position same as the gravity center of the apparatus and a position located at a distance equal to or shorter than ? of the length in the front-rear direction of the apparatus forwardly away from the gravity center.

Abstract: A screen assembly for a television includes a front screen panel, an opaque masking layer applied to a perimeter of the front screen panel to define a masked perimeter area framing a viewable area of said screen assembly, and at least one touch control operatively coupled to the front screen panel in the masked perimeter area. Indicia identifies the location and/or function of the touch screen control.

Abstract: A secure display system comprises one or more closure devices having non-transparent polycarbonate projection panels, one or more projectors, and a PC for providing both security and advertising capabilities. The secure display system can display publicly viewable information by projecting images containing, for example, text, graphics, and video from the inside through the projection panels, thus creating an externally viewable display while securing the premises. In some embodiments, the closure device can include a plurality of projection panels in the form of a security roll down shutter. Transparent viewing panels can also be included adjacent the projection panels to provide both viewing and projecting capabilities.

Abstract: A projection television including: a screen having a plurality of image-forming sheets and an anti-dust film having a first side disposed between the image-forming sheets and a second side disposed at a front of the screen, and being detachable from the screen.

Abstract: An exhaust device of an image display is provided. The exhaust device includes a supporter and an exhaust cover. The supporter is connected to and supported by a back cover of the image display, and is protruded toward an inside of the image display, and has openings formed thereat forming an exhaust channel. The exhaust cover is connected to and supported by the supporter, and is formed on the exhaust channel so that the exhaust channel is diverged into plural directions.

Abstract: A projection apparatus includes a screen to display a picture thereon, an upper cabinet to support the screen, an optical engine provided in a lower portion of the upper cabinet to project an image beam toward the screen, a circuit unit to drive the optical engine, a lower cabinet to accommodate the optical engine and the circuit unit, and a partition plate provided in the lower cabinet to partition the lower cabinet into an upper accommodating portion and a lower accommodating portion to allow the lower cabinet to separately accommodate the optical engine and the circuit unit. In the projection apparatus, the optical engine and the driving circuit are separated from each other, thereby improving a cooling efficiency and a working efficiency, and providing a design having various appearances.

Abstract: A projection television including a CRT assembly projecting image beams and a reflecting mirror reflecting the image beams. The projection television has a support casing having support frames provided on both sides thereof below the reflecting mirror, receiving and supporting the CRT assembly, and a lower frame coupled to the bottom of each support frame, supporting the support frame. With this configuration, the present invention provides a projection television having a support casing whose weight is reduced, thereby facilitating transportation thereof and reducing the cost of production and transportation, etc., and further being unlikely to be deformed or deteriorated because of changes in temperature and humidity.

Abstract: A spring mounting clip is provided that preferably includes a spring arm coupled to and extending from a mounting base. The spring arm bends aside as the mirror is pressed against the back wall of a PTV enclosure and spring back to its original unstressed position once the mirror engages a notch in the lower arm portion. The notch preferably includes a locking surface that abuts and constrains the mirror. Alternatively, a spring mounting clip is provided that includes a spring lever arm coupled to and extending between a pair of support legs, which extend up generally at right angles from mounting feet. In operation, the arm, which includes a locking member moves inwardly toward the support legs as a mirror or other object presses against the arm and moves outwardly or freely springs away from the support legs once the mirror or object passes a transition region of the lower portion of the arm and is received by the locking member.

Abstract: A rear projection television includes a casing with a space therein and a plurality of modular units. A plurality of maintenance holes are formed through the casing to communicate with the space. The modular units are positioned in the space to correspond to the maintenance holes. When one component inside the casing needs repairing, only a lid covering the corresponding maintenance hole is dismounted for the user to quickly take the component out, without moving the casing. Thereby, the repair process is simplified with saved repair labor and space.

Abstract: A rear-project video assembly with a foldable reflector includes a housing and a screen mounted in a first side of the housing. A reflector has one side pivotally connected to a second side of the housing for reflecting image to the screen. An overhead projector is mounted on a bottom of the housing for projecting image to the reflector and a drive device is mounted between the screen and the reflector for expanding the reflector when using the reflector and backward moving the reflector after using the reflector to reduce the volume of the rear-project video assembly. A bellows is mounted between the peripheries of the second side of the housing and the reflector to prevent the foreign matter and the light ray from entering the housing.

Abstract: In order to provide a rear projector capable of facilitating position adjustment of an image displayed on a screen and optimizing dispersion of the aspect ratio of the projected image caused by tolerance of components by adjusting the position of the image, a support member (200) is provided with a lateral position adjuster (202) as a planar position adjusting mechanism attached on a support plate of an interior unit in an opposing manner, an inclination adjuster (203) as an inclination position adjusting mechanism vertically provided on the lateral position adjuster (202), and a rotary position adjuster (204) as a rotary position adjusting mechanism attached to the inclination adjuster (203) slanted downward toward rear side.

Abstract: An assembled housing of rear projection television comprising a foldable main framework and a foldable back cover is disclosed. The main framework is a flat structure as folded, while the main framework forms a ring structure as unfolded. The ring structure includes a front opening and a back opening, while the back cover is positioned in the back opening to form a chamber. The foldable design of the housing facilitates the users and the vendors to assemble the rear projection television, and also reduce the hardware space occupied by the housing, so as to reduce the cost of transportation compared to a traditional rear projection television.

Abstract: Disclosed is a display apparatus including a front cover, a rear cover coupled the front cover and forming an accommodating space, a display panel disposed inside the accommodating space, a main PCB having a signal processor and transmitting a video signal to the display panel, and a PCB supporting member supporting the main PCB. The display apparatus includes a TV tuner unit having a TV tuner receiving the TV video signal, a casing accommodating the TV tuner, and a connector electrically connected with the TV tuner, a tuner unit accommodating part accommodating the TV tuner unit, and a connection port provided at the tuner unit accommodating part for transmitting the TV video signal from the TV tuner unit to the signal processor.

Abstract: A projection television having a CRT assembly projecting image beams and front and rear casings, respectively provided in a front and a back of the CRT assembly, and further having a pair of CRT brackets provided between the front and rear casings, to support the CRT assembly. The CRT bracket is made of a conductive metallic material, thereby reducing deformation and deterioration because of changes in temperature and humidity, discharging heat generated from the CRT assembly, and blocking EMI.

Abstract: A screen fastening device of a projection television having a front cabinet including a front window of a case, a screen for penetrating or forming an image, a fastening bracket for fastening the screen to the front cabinet, a mating portion for removably fastening the fastening bracket, which has one or more hooking protrusions formed on the fastening bracket, and a hooking protrusion receiving portion formed on the front cabinet to correspond to the hooking protrusion, to the front cabinet, and a supporting member for supporting and holding the fastening bracket for the mating portion to firmly fasten the fastening bracket to the front cabinet is provided. The screen fastening device can improve the workability and productivity as it can fasten or unfasten without using screws on the front surface of the projection television by the mating portion and the supporting member.

Abstract: A multi-monitor is provided with a first display device having a display screen and a second display device having a display screen smaller than the display screen of the first display device, and a supporting mechanism which is mountable on an outside portion of the first display device, and supports the second display device rotatably about a first axis and a second axis intersecting the first axis. The first second display device is driven in accordance with the same operation system as the first display device.

Abstract: An image display device includes a case having an opening, a luminous source image display displaying a first image, a focusing element receiving light from the source image display and focusing the light to form a second image that is viewable through the opening of the case, and an image source providing image information to the source image display so that the source image display displays the first image. The focusing element has a concave mirror and a mirror supporter that supports the concave mirror. The perimeter of the concave mirror has at least one straight- cut portion that has a line contact with the mirror supporter. The image information provided by the image source is changed with user interaction.

Abstract: A cabinet for a projection television system, the cabinet including a one-piece molded structure for mounting the components, and reference surfaces unitary with the structure, for mechanically aligning critical optical components of the television system with one another.

Abstract: The invention provides a projection device comprising a screen constituted in a layered structure with a light-transmissive screen panel and a light-transmissive reinforcing panel, wherein a front panel in the screen has a plane wider than residual panels on the back of the screen, an image projector for projecting an image on the screen, a screen frame fit on the peripheral edges of the residual back panels with a plane smaller than the front panel, a double-side adhesive tape inserted between residual back panels and the screen frame for uniting them together, a single-side adhesive tape applied across the peripheral edges of the front panel and the screen frame for uniting them together, and a housing for accommodating therein the image projector and for holding at its opening the screen via the screen frame so as that the front panel of the screen exposes outside.

Abstract: Disclosed is a structure of a projection television comprising a screen, a front panel, a supporting part upon which an image forming device is mounted, an one-piece cabinet having an upper opening for the screen and a lower opening for the front panel, and upper and lower back covers provided at the rear of the one-piece cabinet.

Abstract: A shielding apparatus of projection television is disclosed. A metal shield casing made of metal plate members shields an optical block and a circuit block. Metal plate printed board holding sections are connected to the metal shield casing detachably at predetermined intervals, and hold the printed board. Connection sections of the metal shield casing elastically contact with the printed board holding section, and connect so as to conduct electrically with the metal shield casing. Further, a part of the metal plate casing of the printed board holding section is elastically fixed to the metal shield casing through the connection section, and shields the optical block and circuit block. Thus, the shield casing excellent in shielding effect of high frequency circuit and easy in servicing is presented.

Abstract: A rear projector has a lower cabinet disposing an image generator and an upper cabinet for a screen body to be mounted, two woofer boxes being mounted on the front side of the lower cabinet and high-pitched sound speaker boxes being respectively mounted on the right and left lateral sides of the upper cabinet, so that, since the woofer box is disposed in the lower cabinet, vibration is not easily transferred to a screen body on the upper cabinet and a reflection mirror inside the upper cabinet, thus avoiding flicker of the image on the screen body even when great volume of sound is outputted by the woofer box.

Abstract: A projection television comprising: a screen displaying a picture; a body casing combining with the screen, a supporting unit provided inside the body casing and supporting the bottom of the screen, and a drain hole formed on the bottom of the supporting unit and discharging moisture permeated into the screen. The projection television discharges the moisture permeated along the screen, thereby preventing the deterioration of the screen.

Abstract: An enclosure for a projection television set is provided that includes an upper compartment to house a mirror and a screen, and a lower compartment attached to the upper compartment. The lower compartment preferably includes a front panel, a rear panel, and a plurality of side panels wherein at least two side panels have an attachment region for a bracket of an optical unit. The attachment region may be angled surfaces designed to aim the optical unit toward the mirror of the projection television set. The attachment region may also be angled openings for insertion of first and second ends of the bracket of the optical unit therein, the angled openings configured to aim the optical unit toward the mirror. Alternatively, the attachment region may include a member having an elongate body with a top surface, a bottom surface, a first end, a second end, and a notch extending between the ends along the top surface of the elongate body, wherein the notch engages the bracket of the optical unit.

Abstract: A system and method that facilitates the transformation of PTVs, when in the “OFF” mode, into aesthetically pleasing decorative furniture. The PTV preferably includes a primary and a secondary projection system. The secondary projection system preferably comprises a projection unit optically coupled to the screen of the PTV and an auxiliary image source coupled to the projection unit. Preferably, the program logic of the PTV directs the projection of an image from the secondary projection unit onto the screen when the PTV is in the “OFF” mode.

Abstract: In order to provide a rear projector capable of facilitating position adjustment of an image displayed on a screen and optimizing dispersion of the aspect ratio of the projected image caused by tolerance of components by adjusting the position of the image, a support member (200) is provided with a lateral position adjuster (202) as a planar position adjusting mechanism attached on a support plate of an interior unit in an opposing manner, an inclination adjuster (203) as an inclination position adjusting mechanism vertically provided on the lateral position adjuster (202), and a rotary position adjuster (204) as a rotary position adjusting mechanism attached to the inclination adjuster (203) slanted downward toward rear side.

Abstract: An image transmission system for a rear projection television includes a main board module and an optical engine module connected to the main board module. When the system actuates, the main board module receives control and image signals to allow a CPU of the main board module commanding a CPU of the optical engine module. The CPU of the optical engine module commands a light valve unit of the optical engine module to generate images that are then projected onto a screen. Because each module is controlled by its corresponding CPU and has a standardized connection port, the modules can be separately debugged and easily connected to external peripherals, thereby reducing the research and development time.

Abstract: A CRT support panel for a projection television set is provided that includes a generally vertically extending body, a mounting foot extending from the base of the body and a handle extending from the top of the body. The body preferably has a thin walled open corrugated profile. The corrugated profile enables the cross-section of the panel to be increased to significantly increase it strength to guard against buckling without significantly increasing its weight. The panel, which is preferably plastic injection molded as a unitary part, tends to have sufficient flexibility to guard against shock and vibration damage during transportation.

Abstract: A video projector includes a cabinet, and adjusters provided in bottom and top surfaces of the cabinet and located on left and right positions of the bottom and top surfaces close to the front surface of the cabinet. The adjusters are supported by shafts perpendicular to the front surface so as to be rotatable in an angular range of 90°. When the adjusters are postured to be perpendicular to bottom and top surfaces of the cabinet, the cabinet is placed horizontally. When the adjusters are postured to be perpendicular to left and right side surfaces of the cabinet, the cabinet is placed vertically. Since a horizontal/vertical placement change-over switch is operated in accordance with the horizontal/vertical placement of the cabinet, a video image can be projected correctly onto a screen regardless of the horizontal/vertical placement of the cabinet.

Abstract: A screen assembly for a television includes a front screen panel, an opaque masking layer applied to a perimeter of the front screen panel to define a masked perimeter area framing a viewable area of said screen assembly, and at least one touch control operatively coupled to the front screen panel in the masked perimeter area. Indicia identifies the location and/or function of the touch screen control.

Abstract: A projection television set having an enclosure housing a screen, an optical unit and a mirror, wherein the optical unit and mirror are capable of projecting an image onto the screen. The enclosure is preferably constructed from hollow plastic extruded panels. In addition, the enclosure preferably includes a duct extending upwardly from a lower portion of the enclosure to exhaust heat radiating from components housed therein to the exterior of the enclosure toward the top of the enclosure.

Abstract: A computer generated image may be displayed inside an enclosure. The enclosure may include a transreflective surface so that the user can view the image generated by the computer system overlaid with a body part of the user. The computer generated images may move relative to the known position of the body part. As a result, the illusion is created that the physical body part interacts in a meaningful way with the computer generated image.

Abstract: A projection television including a CRT assembly projecting image beams, and a lower casing accommodating the CRT assembly therein. The projection television further includes a pair of grip parts inwardly recessed on opposite sides of the lower casing so that the CRT assembly is supported by the pair of grip parts. With this configuration, the projection television has a reduced weight with a simple structure, thereby facilitating transportation thereof and decreasing the cost of production and custody therefor. Further, the lower casing provided with the grip part is made of the conductive metallic material, thereby preventing deformation or deterioration due to changes in temperature and humidity, effectively discharging out heat generated from a CRT assembly, and effectively blocking EMI. Further, there is provided a reinforcing member made of the conductive metallic material, thereby effectively discharging out heat generated from a CRT assembly and effectively blocking EMI.

Abstract: A shield plate mounting apparatus is disclosed which mounts a shield plate 4 on a casing 3 of a recording/reproducing apparatus 2 formed to be integral with a television receiver. In this shield plate mounting apparatus, a plurality of projection portions 7a to 7c are provided on the casing 3 at predetermined angular intervals to project therefrom. A slip-off preventing piece 8 is formed to be integral with each of the projection portions 7a and 7b and as to bend from the top end of each of the portions 7a and 7b in a direction nearly perpendicular thereto. A plurality of kinds of mounting angles &agr; of the shield plate 4 are set, and a plurality of through holes 9a to 9c respectively facing the projection portions 7a to 7c are pierced through the shield plate 4 correspondingly to each of the kinds of the mounting angles &agr;.

Abstract: A projection television including a CRT assembly projecting image beams and a reflecting mirror reflecting the image beams. The projection television has a support casing having support frames provided on both sides thereof below the reflecting mirror, receiving and supporting the CRT assembly, and a lower frame coupled to the bottom of each support frame, supporting the support frame. With this configuration, the present invention provides a projection television having a support casing whose weight is reduced, thereby facilitating transportation thereof and reducing the cost of production and transportation, etc., and further being unlikely to be deformed or deteriorated because of changes in temperature and humidity.

Abstract: A spring mounting clip is provided that preferably includes a spring arm coupled to and extending from a mounting base. The spring arm bends aside as the mirror is pressed against the back wall of a PTV enclosure and spring back to its original unstressed position once the mirror engages a notch in the lower arm portion. The notch preferably includes a locking surface that abuts and constrains the mirror. Alternatively, a spring mounting clip is provided that includes a spring lever arm coupled to and extending between a pair of support legs, which extend up generally at right angles from mounting feet. In operation, the arm, which includes a locking member moves inwardly toward the support legs as a mirror or other object presses against the arm and moves outwardly or freely springs away from the support legs once the mirror or object passes a transition region of the lower portion of the arm and is received by the locking member.

Abstract: A controller 112 checks and determines whether or not an electronic apparatus 11 is electrically connected. When a TV signal processor 106 is not connected to another apparatus, i.e., the electronic apparatus 11, a signal processing circuit 113 performs normal signal processing. When the TV signal processor 106 is connected to another apparatus, i.e., the electronic apparatus 11, the TV signal processor 106 cooperates with the compliant electronic apparatus as if they were a single apparatus and performs optimal processing of an input signal. In an ID table stored in the controller 112, processing information concerning processing tasks to be shared with the compliant electronic apparatus is associated with the function ID of the compliant electronic apparatus.

Abstract: A screen assembly for a projection television includes a screen panel, a lenticular screen and a Fresnel screen. The screen panel is attached directly to the television cabinet and sandwiches the Fresnel and lenticular screens therebetween. The screen panel projects laterally beyond the lenticular and the Fresnel screens and a recess may be provided in the television cabinet to receive the Fresnel and lenticular screens, so that the screen protection panel overlaps the front face of the cabinet sidewalls. In an exemplary embodiment, decorative bolts pass through the screen panel to secure the screen panel to the cabinet.

Abstract: A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in monochrome, color or gray scale. Pixel size is controlled as a function of distance of the image from the module to control image resolution and allow the image to remain sharp and clear over an extended range of distances from the module.

Abstract: An optical system includes a lens assembly fixed to a base for projecting an image light onto a surface; a DMD assembly movably disposed at one side of the lens assembly for reflecting the light irradiated from a light source onto the lens assembly; supporting members disposed at the one side of the lens assembly for supporting the DMD assembly; and an adjuster for moving the DMD assembly to adjust a tilt. The adjuster includes a guide member having a screw hole and fixed to the base; an adjusting screw driven into the screw hole for moving the DMD assembly along a lengthwise direction of the guide member; and a push rod having an end connected to the DMD assembly and another end connected to the adjusting screw. The DMD assembly is movable by adjusting the adjusting screw so that a tilt angle can be easily and precisely adjusted.