Projection device

A projection device includes a light source module for emitting an illumination beam, an optical engine module for receiving the illumination beam and forming an image beam, and a projection lens for receiving and projecting the image beam to an outside of the projection device. The optical engine module includes first and second shells coupled in a first direction, an elastic sealing member and electronic components. The shells form an accommodation space in which the electronic components are disposed. The elastic sealing member has opposite first and second surfaces. The first surface has an engagement groove in which a portion of the first shell is engaged. The second shell abuts against the second surface. Signal transmission components of the electronic components are disposed through the elastic sealing member to pass through the shells.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application (CN201811383287.5), filed on 2018 Nov. 20. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

FIELD OF THE INVENTION

The invention relates to a display device, and more particularly to a projection device.

BACKGROUND OF THE INVENTION

A projection device processes an illumination beam provided by a light source into an image beam by an optical engine module, and then the image beam is projected onto a screen by a projection lens to form an image on the screen. The optical engine module includes a plurality of optical elements. In order to prevent dust from contaminating the optical elements and affecting the display quality, the optical elements are usually covered with a dust-proof housing inside the projection device.

Since the electronic components of the optical engine module are also covered in the dust-proof housing, the top wall of the dust-proof housing needs to be provided with openings for the transmission lines of electronic components to pass to an outside of the dust-proof housing. Furthermore, sealing the opening with a rubber piece to prevent dust from entering the dust-proof housing is necessary. Therefore, the conventional projection device takes a lot of time to assemble. If it is to be imported into an automated production facility, it is also necessary to add complex clamps and robotic arms, resulting in high cost.

The information disclosed in this “BACKGROUND OF THE INVENTION” section is only for enhancement understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Furthermore, the information disclosed in this “BACKGROUND OF THE INVENTION” section does not mean that one or more problems to be solved by one or more embodiments of the invention were acknowledged by a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The invention provides a projection device to improve assembly efficiency.

Other advantages and objects of the invention may be further illustrated by the technical features broadly embodied and described as follows.

In order to achieve one or a portion of or all of the objects or other objects, an embodiment of the invention provides a light source module, an optical engine module, and a projection lens. The light source module is used for emitting an illumination beam. The optical engine module is disposed on a transmission path of the illumination beam and used for receiving an illumination beam and forming an image beam. The optical engine module includes a first shell, a second shell, an elastic sealing member, and electronic components. The second shell and the first shell are coupled to each other in the first direction to form an accommodation space. The elastic sealing member is disposed between the first shell and the second shell for sealing the junction of the first shell and the second shell. The elastic sealing member has an opposite first surface and a second surface, wherein the first surface faces the first shell and the second surface faces the second shell. The first surface has an engagement groove. A portion of the first shell is engaged in the engagement groove. The second shell abuts against the second surface. At least one electronic component is disposed in the accommodation space and each of the at least one electronic component has a signal transmission component. The signal transmission component is disposed through the elastic sealing member to pass to the outside of the first shell and the second shell. The projection lens is disposed on the transmission path of the image beam and is used for receiving the image beam and projecting the image beam to an outside of the projection device.

In the projection device of the embodiments of the invention, the signal transmission component of the electronic component passes to the outside of the first shell and the second shell of the optical engine module via an elastic sealing member between the first shell and the second shell. Therefore, compared to the conventional technology in which a rubber member is additionally required to seal the opening from which the transmission line passes through, the projection device of the embodiments of the invention can simplify the process of assembly and improve assembly efficiency. Moreover, because the process of assembly of the embodiments of the invention is relatively simpler, the cost of automation equipment can be reduced if automated production is to be performed.

In the projection device of the embodiments of the invention, the first surface of the elastic sealing member has an engagement groove, and a portion of the first shell is engaged in the engagement groove to increase the sealing property of the junction between the first shell and the second shell, thereby improving dust-proof effect.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1is a schematic block diagram of a projection device according to an embodiment of the invention. Please refer toFIG. 1. A projection device10of the embodiment includes a light source module100, an optical engine module200and a projection lens300. The light source module100is used for emitting an illumination beam L1. The optical engine module200is disposed on a transmission path of the illumination beam L1, and the optical engine module200can be used for receiving the illumination beam L1and forming an image beam L2. The projection lens300is disposed on a transmission path of the image beam L2, and can be used for receiving the image beam L2and projecting the image beam L2to the outside of the projection device10, for example, projecting the image beam L2to the screen to form an image on the screen.

The light source module100may include a light bulb (such as a halogen bulb, a high pressure mercury lamp, etc.), and the generated illumination beam L1may be white light. The light source module100may also include a light emitting diode (LED) light source, and the generated illumination beam L1may be composed of red, blue, and green light. The light source module100may also include a laser source, and the generated illumination beam L1may be blue light. Further, the light source module100may also be other types of light sources.

The optical engine module200includes a light valve (not shown in figure) for forming the image beam L2. The light valve may be a reflective light valve or a transmissive light valve, wherein the reflective light valve may be a digital micro-mirror device (DMD) or a liquid crystal on silicon panel (LPOS panel), and the transmissive light valve may be a transmissive liquid crystal panel, but is not limited thereto.

The optical engine module200further includes at least one electronic component240(only illustrated inFIG. 1by one), and the electronic component240has a signal transmission component241. The projection device10further includes, for example, a motherboard400disposed outside the optical engine module200. The motherboard400is electrically connected to the electronic component240by the signal transmission component241. The motherboard400can be used for controlling the electronic component240or receiving electrical signals provided by the electronic component240. The signal transmission component241may be a transmission line, a flexible printed circuit, or the like, but is not limited thereto.

The projection lens300includes, for example, a combination of one or more optical lenses having diopter, such as including various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In an embodiment, projection lens300may also include planar optical lenses. The invention does not limit the type and configuration of the projection lens300.

FIG. 2Ais a schematic exploded view of a first shell, a second shell, and an elastic sealing member of an optical engine module according to an embodiment of the invention, andFIG. 2BandFIG. 2Care schematic partial enlarged exploded views of a first shell, a second shell, and an elastic sealing member at different angles according to an embodiment of the invention. Please refer toFIG. 2A,FIG. 2BandFIG. 2C. The optical engine module200further includes a first shell210, a second shell220, and an elastic sealing member230. The second shell220and the first shell210are coupled to each other in a first direction (e.g. a Z-axis direction) to form an accommodation space S. In this embodiment, the optical engine module200receives the illumination beam L1from the light source module100, the light source module100is, for example, a laser light source, and the generated illumination beam L1may be a blue laser. The optical engine module200further includes a plurality of electronic components240. For example, the optical engine module200may include: a wheel for dividing the illumination beam L1into different colors according to time sequences, such as a filter wheel or a wavelength conversion wheel; a wheel detection element for detecting the rotation of the wheel; an actuator capable of causing the speckles of the illumination beam L1to be projected onto the light valve to move a distance at half a pixel to enhance image resolution; and a fan for dissipating heat from the electronic components. The electronic component240inFIG. 1is disposed in the accommodation space S. The electronic component240inFIG. 1may include electronic components such as a wavelength conversion wheel240a, a filter wheel240band a fan240cillustrated inFIG. 2Aand may also include the wheel detection elements, the actuators and the other electronic components not shown. The elastic sealing member230has a first surface231and a second surface232opposite to each other, wherein the first shell210abuts against the first surface231and the second shell220abuts against the second surface232.

The first surface231of the elastic sealing member230has an engagement groove233disposed along a junction of the first shell210and the second shell220. A portion of the first shell210is engaged in the engagement groove233. Specifically, the first shell210has a first bottom wall211and a plurality of first side walls212surrounding and connected to the first bottom wall211. The first side wall212has a first top surface213facing the first surface231and a plurality of first side surfaces215connected to the first top surface213. The first top surface213and a portion of the first side surface215adjacent to the first top surface213abut against the engagement groove233. In this embodiment, a junction surface of the second shell220and the first shell210is, for example, an X-Y plane, and the first direction is, for example, perpendicular to the X-Y plane. Further, the elastic sealing member230is disposed between the first shell210and the second shell220for sealing the junction of the first shell210and the second shell220. As viewed in a top view angle in the first direction, the electronic components, including the wavelength conversion wheel240a, the filter wheel240b, the fan240c, etc., are located in the area surrounded by the elastic sealing member230. In addition, the material of the elastic sealing member230may include rubber or other elastic material.

In order to improve the tightness of the junction between the first shell210and the second shell220, the second surface232of the elastic sealing member230may have a protruding portion234disposed along the junction of the first shell210and second shell220. The second shell220may have a second bottom wall221and a second side wall222connected to and surrounding the second bottom wall221. The second sidewall222has a second top surface223facing the second surface232and abutting against the protruding portion234. The protruding portion234can enhance the tightness between the second top surface223and the second surface232.

Referring again toFIG. 2A, at least one of the first top surface213of the first side walls212of the first shell210which faces the second shell220has at least one groove214. In other words, each of the first top surfaces213of the first side walls212may be provided with one or more grooves214as needed, and some of the first top surfaces213of the first side walls212may not be provided with groove214. The groove214is used for allowing a signal transmission component (not shown in figure) of the electronic component such as the wavelength conversion wheel240a, the filter wheel240b, and the fan240c, etc. to pass to the outside of the first shell210and the second shell220. The number and position of the grooves214are matched with the number and position of the electronic components, but the number of grooves214and the number of the electronic components are not limited to one-to-one. Further, the elastic sealing member230has, for example, a sealing strip238and at least one sealing block239. The sealing strip238seals the junction of the first shell210and the second shell220. The contour of the sealing strip238corresponds to the contour of the junction of the first shell210and the second shell220. Each sealing block239is formed by extending from the sealing strip238in the first direction, and the sealing block239corresponds to the groove214. That is, an external force can be applied to secure the sealing block239in the groove214in the first direction.

The first shell210may further have a plurality of fixing columns216connected to the first side wall212. Each fixing column216has fixing hole217. The second shell220has a plurality of through holes224corresponding to the fixing holes217. The elastic sealing member230further has a plurality of set rings237connected to the sealing strip238and sleeved on the fixing columns216. The projection device of the embodiment may further include a plurality of fixing members3deposed to pass through the through holes224and the fixing holes217to fix the first shell210and the second shell220. In this embodiment, the fixing hole217may have an internal thread, the fixing member3may be a screw having an external thread, and the external thread of the fixing member3corresponds to the internal thread of the fixing hole217. The fixing members3, the fixing columns216and the set rings237may have the same amount. However, inFIG. 2A, in order to clearly show all the structures, it is indicated by the four fixing members3. However, the fixing mechanism between the first shell210and the second shell220is not limited to the embodiment. The plurality of fixing columns may also be disposed on the second shell220, and when the fixing columns are deposited on one of the first shell210or the second shell220, corresponding fixing holes may be deposited on another. In addition, a portion of a plurality of fixing columns may be disposed on the first shell210, the other portion is disposed on the second shell220, and the fixing holes can be distributed corresponding to the fixing columns to achieve the above fixing function.

FIG. 3is a schematic diagram of a signal transmission component of an electronic component passing to an outside of a first shell and a second shell according to an embodiment of the invention. Referring toFIG. 1,FIG. 2AandFIG. 3, the signal transmission component241of the electronic component240inFIG. 1, that is, the electronic component such as the wavelength conversion wheel240a, the filter wheel240b, the fan240cand etc. inFIG. 2A, may include a first signal transmission component242and a second signal transmission component243, wherein the first signal transmission component242can be a transmission line, and the second signal transmission component243can be a flexible printed circuit (FPC). The first signal transmission component242and the second signal transmission component243may be disposed to pass through the elastic sealing member230to pass to the outside of the first shell210and the second shell220. In other embodiment, the first signal transmission component242or the second signal transmission component243may pass through from an inside of the accommodation space S to the outside of the accommodation space S via the elastic sealing member230. In other, Specifically, one ends of the first signal transmission component242and the second signal transmission component243are located in the accommodation space S and electrically connected to the electronic component such as wavelength conversion wheel240a, filter wheel240b, the fan240cand etc, and the other ends pass through the elastic sealing member230and are located outside the first shell210and the second shell220, so that the first signal transmission component242and the second signal transmission component243can be connected to the motherboard400inFIG. 1. The first signal transmission component242and the second signal transmission component243are disposed to pass through the elastic sealing member230in the second direction, and the second direction is, for example, perpendicular to the first direction. For example, the second direction may include an X-axis direction, a Y-axis direction, and other directions parallel to the X-Y plane, but the invention is not limited thereto.

The elastic sealing member230in the embodiment further has, for example, at least one trench235, and each trench235extends from the sealing strip231in the first direction into the corresponding sealing block239. The trench235can be, for example, a straight trench. The second signal transmission member243as being a flexible printed circuit can enter the trench235in the first direction. The elastic sealing member230in this embodiment may further have at least one trench235a. The trench235amay include a straight trench236and an accommodation hole236a. The straight trench236extends from the sealing strip238to the corresponding sealing block239in the first direction. The accommodation hole236ais located in the corresponding sealing block239and communicates with the straight trench236. The first signal transmission component242as being a transmission line, may enter and be received in the corresponding accommodation hole236avia the corresponding straight trench236in the first direction. That is, before coupling the first shell210and the second shell220, an external force may be first applied to the first signal transmission component242to secure to the accommodation hole236athrough the straight trench236from up to down in the first direction and to the second signal transmission component243to secure to the trench235with a straight trench form up to down in the first direction, and then a coupling is performed between the first shell210and the second shell220. In addition, for the trench235a, the maximum width of the accommodation hole236ais, for example, greater than the maximum width of the corresponding straight trench236, and the diameter of the accommodation hole236ais, for example, matched to the diameter of the signal transmission component242, so as to avoid an excessive gap between the first signal transmission member242and the hole wall of the accommodation hole236a. In addition, since the maximum width of the straight trench236is smaller than the maximum width of the accommodation hole236a, there is less possibility of dust entering the interior of the optical engine module200from the straight trench236. In addition, after the first shell210is coupled with the second shell220, the gap between the trench235or the trench235amay be glued to further reduce the possibility of dust entering the optical engine module200.

In the projection device10of the embodiment of the invention, the signal transmission component241of the electronic component240passes to the outside of the first shell210and the second shell220of the optical engine module200via the elastic sealing member230between the first shell210and the second shell220. As compared with the prior art in which a rubber member is further required to seal the opening for the transmission line to pass therethrough, the projection device10of the embodiment of the invention can simplify the assembly process and improve the assembly efficiency. Moreover, because the assembly process is relatively simple, the invention can reduce the cost of automation equipment if automated production is applied.

In the projection device10of the embodiment of the invention, the first surface231of the elastic sealing member230has an engagement groove233, and a portion of the first shell210is engaged in the engagement groove233to increase the tightness of the junction between the first shell210and the second shell220, thereby improving dust-proof effect.

In the projection device10of the embodiment of the invention, the second surface232of the elastic sealing member230has a protruding portion234, which can effectively improves the tightness between the second shell220and the elastic sealing member230, thereby further improving the dust-proof effect.

FIG. 4Ais a schematic diagram of a second shell having a side retaining wall according to another embodiment of the invention.FIG. 4Bis a cross-sectional schematic diagram of a first shell, a second shell, and an elastic sealing member of an optical engine module assembled in a first direction according to another embodiment of the invention. Referring toFIG. 1,FIG. 4AandFIG. 4B, the second shell220may further has a side retaining wall225which may be distributed along all or part of the elastic sealing members230to block the direct illumination of the light from the optical engine module200to the elastic sealing member thereby preventing the elastic sealing member230from generating volatile substances. However, the side retaining wall225is not limited to be disposed on the second shell220and may be disposed on the first shell210. Same as the previous embodiment, the first surface231of the elastic sealing member230is abutted against by the first shell210, and the second surface232is abutted against by the second shell220. By engaging a portion of the first shell210into the engagement groove233and abutting the second shell220against the protruding portion234of the second surface232, the elastic sealing member230can well seal the junction of the first shell210and the second shell220, thereby having a high effective dust-proof consequence.