CN113156754A

CN113156754A - Closed semi-vertical LCD projection optical machine

Info

Publication number: CN113156754A
Application number: CN202110545011.8A
Authority: CN
Inventors: 陈灵
Original assignee: 陈灵
Current assignee: Shenzhen Liangzi Photoelectric Technology Co.,Ltd.
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-07-23

Abstract

The invention discloses a closed semi-vertical LCD projection optical machine, which comprises an optical machine shell, an optical assembly and a heat dissipation assembly, wherein the optical machine shell is provided with a light source and a light source; the optical machine shell is provided with a light source mounting port, a lens mounting port, a heat exchange mounting port and a reflector mounting port; the optical assembly comprises an LED light source, a condenser lens, an illumination reflector, a collimating lens, heat reflecting glass, an LCD light valve, a field lens, an imaging reflector and a projection lens which are sequentially arranged according to the light advancing direction; the heat dissipation assembly comprises a radiator, an external fan, an air guide cover, a heat exchange assembly, an internal fan, a heat expander and a return air pipe. The invention makes the structure of the full-sealed optical machine simpler and the heat dissipation more efficient under a brand-new optical path structure shape, and creates favorable conditions for the full-sealed optical machine to be manufactured more simply and efficiently, and to output higher brightness and better durability.

Description

Closed semi-vertical LCD projection optical machine

Technical Field

The invention relates to the field of projectors, in particular to a closed semi-vertical LCD optical machine.

Background

The single LCD projector, the optical system is totally sealed, since it was born in 2009 to date, it is still a phoenix hair in the industry, besides higher cost, complex structure and complicated manufacturing, it is also a big problem that after sealing, because the LCD light valve transmission efficiency is really too low, most of the energy of the illumination light is gathered inside the optical machine to form joule heat, which is difficult to be efficiently transferred to the outside of the optical machine, and in order to maintain the thermal operation reliability of the optical machine, especially the liquid crystal, the prior art almost chooses to sacrifice the output brightness of the projector, i.e. reduce the power of the projection light source (total heat source) to maintain the temperature threshold of the optical machine. Therefore, in view of the above technical constraints, fully sealed single LCD projector engines have not become much popular in the industry.

In the process of continuously trying to realize full sealing, the full-sealing optical machine is applied even to the full-sealing optical machine along with the refrigeration technologies such as peltier, the multidimensional heat conduction technologies such as uniform temperature plates, the advanced materials such as graphene, the heat conduction plastics and the like. The common property of the technologies is that the manufacturing cost and the complex difficulty of the process of the optical machine are further, remarkably and even unacceptable in the market, for example, one optical machine which realizes 200Lm output by applying a 3.5 inch FHD light valve adopts graphene to conduct heat conduction and heat diffusion on the optical machine, the cost increase is 15-20 times of that of the original optical machine, and the market does not have the possibility of accepting the high-price and low-efficiency product; some of the technologies also greatly reduce the reliability of optical machines, such as semiconductor refrigeration and thermal conductivity plastics. Therefore, almost none of the new application technologies has gained the basic acceptance of the market.

In 2020, the single LCD projector has a new history of shipment volume, and has stepped over ten million customs, some influential brand merchants are actively added, and an open optical system has almost no durability and weather resistance for the practical working environments such as dust, moisture, smoke and the like although the heat dissipation is relatively easy and the output brightness is high; the closed optical machine has low brightness, low cost performance and poor market adaptability, and the inherent defects are difficult to be accepted by merchants with certain brand value and level because the merchants represent user requirements with higher quality requirements, namely, the product has certain durability and weather resistance in real working environments such as dust, moisture, smoke and the like, so that more lasting value is provided for users, and the product has higher output brightness to meet the user requirements. Therefore, on the way of transforming a single LCD projector to a consumer digital product, how to solve the engineering and technical problems of low output brightness, high cost, complex structure and complicated manufacturing of the sealed optical machine becomes a problem to be continuously solved by those skilled in the art.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a closed semi-vertical LCD projection optical machine, obtains a brand new optical path structure shape, simplifies the structure of a full-sealed optical machine, has more efficient heat dissipation, and creates favorable conditions for simpler and more efficient manufacture, higher output brightness and better durability of the full-sealed optical machine.

In order to achieve the above object, the present invention provides a closed semi-vertical LCD projection optical machine, which comprises an optical machine housing, an optical assembly and a heat dissipation assembly; the optical machine shell is provided with a light source mounting port, a lens mounting port, a heat exchange mounting port and a reflector mounting port; the optical assembly comprises an LED light source, a condenser lens, an illumination reflector, a collimating lens, heat reflecting glass, an LCD light valve, a field lens, an imaging reflector and a projection lens which are sequentially arranged according to the light traveling direction.

The heat dissipation assembly comprises a radiator, an external fan, an air guide cover, a heat exchange assembly, an internal fan, a heat spreader and a return air pipe.

The LED light source is located light source installation department, the projection lens is located lens installation department, the illumination speculum is located speculum installation department, the radiator is located ray apparatus casing outside and laminating the LED light source sets up, heat exchange assembly install in heat transfer installation department makes the ray apparatus casing inside seals with the outside air and completely cuts off.

The condenser lens, the collimating lens, the heat reflecting glass, the LCD light valve, the field lens and the imaging reflector are positioned in the optical machine shell. The illumination reflector reflects and turns light irradiating the LCD light valve in the up-down direction, and the imaging reflector reflects and turns light emergent from the LCD light valve in the left-right direction.

The external fan is positioned outside the optical machine shell and connected with the outer wall of the optical machine shell; the internal fan is installed inside the optical housing.

A first channel is defined between the condensing lens and the incidence surface of the illumination reflector and between the reflecting surface of the illumination reflector and the incidence surface of the collimating lens; a second channel is defined between the emergent surface of the collimating lens and the incident surface of the heat reflecting glass; a third channel is enclosed between the emergent surface of the heat reflecting glass and the incident surface of the LCD light valve; a fourth channel is enclosed between the emergent surface of the LCD light valve and the incident surface of the field lens; the air return pipe is located outside the optical machine shell, one end of the air return pipe is communicated with the first channel, and the other end of the air return pipe is communicated with the air inlet of the internal fan.

The heat exchange component comprises a heat absorption part positioned in the optical machine shell and a heat release part connected with the heat absorption part and positioned outside the optical machine shell; an air outlet of the internal fan is aligned with one end of the heat absorption part, and the other end of the heat absorption part is opposite to the second channel, the third channel and the fourth channel; the heat release part and the radiator are arranged in parallel; the heat spreader is attached to the outer surface of the illumination reflector. Preferably, the heat absorbing part is composed of a plurality of metal sheets arranged side by side, and a gap is reserved between every two adjacent metal sheets to form the ventilation and heat absorption pipeline.

The forced air generated by the internal fan flows through the heat absorption partAfter being divided into a first part and a second part Wind flow;the second part of air flows through the fourth channel and flows back to the air inlet of the internal fan; one part of the first part of the air flow flows through the third channel and then flows back to the air inlet of the internal fan; and the other part of the first part of the air flow flows through the second channel, the first channel and the air return pipe in sequence and then flows back to the air inlet of the internal fan.

The air inlet of the external fan is opposite to the heat spreader, and the air outlet of the external fan is connected with the air guide cover; the air outlet of the air guide cover is aligned with the radiator and the heat release part. Preferably, the external fan is a turbofan.

Preferably, the illumination reflector is a specular aluminum plate.

Preferably, the condenser adopts a plano-convex lens, the plane faces the LED light source, and the surface type of the convex surface adopts an anamorphic aspheric surface or an XY polynomial free-form surface.

Furthermore, the heat exchange assembly also comprises a flow guide element and a flow dividing element which are arranged in the heat absorption part; the flow guide piece and the flow dividing piece are of arc-shaped sheet structures, and the flow dividing piece divides the forced air flow generated by the internal fan into a first part air flow and a second part air flow; the flow guide piece is used for guiding the first part of wind flow.

Furthermore, the heat dissipation assembly further comprises a first air guiding part which is located in the optical machine shell and used for guiding the flow of the fourth channel, a second air guiding part which is located in the optical machine shell and used for guiding the flow of the third channel, and a third air guiding part which is located in the optical machine shell and used for connecting the first channel and the second channel.

Further, the number of the internal fans is one or more, and the internal fans adopt turbofan fans.

Preferably, the heat radiator, the heat radiating part and the heat spreader use straight-rib type aluminum heat radiators.

Optionally, the return air pipe is made of a metal material.

Optionally, the heat dissipation assembly further comprises heat diffusion structures disposed on the inner wall and the outer wall of the return air duct.

The invention obtains a brand new light path structure shape by the reflection combination of the illumination reflector and the imaging reflector in different directions, creates a brand new optical machine stacking shape and has decisive influence on the external shape of the projector, is different from the external shape of the existing horizontal or vertical projector, and provides a new choice for users.

Compared with an open light path, the sealed semi-vertical LCD projection light machine provided by the invention has excellent durability and weather resistance, and provides more lasting value for users.

The sealed semi-vertical LCD projection optical machine provided by the invention has the advantages that on the basis of improving the internal and external heat exchange of the traditional sealed optical machine, the heat absorption and heat dissipation of the heat diffuser and the return air pipe are additionally arranged, and the first channel is connected with the internal fan, so that the internal and external heat exchange capacity of the projection optical machine can be doubled; the heat exchange assembly is internally provided with the flow guide piece and the flow dividing piece, and each channel is provided with each air guide part, so that the wind resistance of the air flow circulation loop in the projection light machine can be reduced, and the heat exchange coefficient of the heat dissipation system can be improved. The projector creates favorable basic conditions for outputting higher brightness.

The sealed semi-vertical LCD projection optical machine provided by the invention has a simple overall structure through the light source mounting port, the lens mounting port, the heat exchange mounting port and the reflector mounting port, and effectively solves the engineering technical problems of complex structure and complicated manufacture of the existing fully-sealed LCD projection optical machine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a cut-away perspective view of a projection light machine according to the present invention;

FIG. 2 is a cut-away perspective view of the projector;

FIG. 3 is an exploded view of a light projector according to the present invention;

FIG. 4 is a diagram showing an overall configuration of a projector according to the present invention;

FIG. 5 is a diagram showing an overall configuration of a projector according to the present invention;

FIG. 6 is an exploded view of the heat exchange module of the present invention;

FIG. 7 is a schematic view of a bisector of a display window of an LCD light valve;

FIG. 8 is a schematic cross-sectional view of a return air duct of the present invention;

FIG. 9 is a schematic view of a conventional horizontal projector;

fig. 10 is a schematic view of an external shape of a conventional vertical projector.

Detailed Description

The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It is to be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the generic and descriptive sense only and not for purposes of limitation, as the term is used in the generic and descriptive sense, and not for purposes of limitation, unless otherwise specified or implied, and the specific reference to a device or element is intended to be a reference to a particular element, structure, or component. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Referring to fig. 1-8, the present embodiment provides a sealed semi-vertical LCD projection optical engine, which includes an optical engine housing, an optical assembly, and a heat dissipation assembly. The optical machine shell is provided with a light source mounting port, a lens mounting port, a heat exchange mounting port and a reflector mounting port. The optical machine housing in the embodiment comprises an optical machine lower shell 18, an optical machine cover plate 17 and an air duct cover plate 16 which are connected and stacked from bottom to top. Wherein, the lower part of the lower optical machine shell 18 is provided with a light source mounting port and a heat exchange mounting port, and the side surface is provided with a lens mounting port; the optical engine cover plate 17 is provided with a reflector mounting opening.

The optical component comprises an LED light source 1, a condenser lens 2, an illuminating reflector 3, a collimating lens 4, heat reflecting glass 19, an LCD light valve 5, a field lens 6, an imaging reflector 7 and a projection lens 8 which are sequentially arranged according to the light traveling direction.

The condenser lens 2 adopts a single lens with a plano-convex structure to realize spotlight illumination. The convex surface is an XY polynomial free-form surface, so that the light-emitting distribution characteristic of the LED light source 1 can be conveniently matched with the light of the LCD light valve 5 under the constraint condition of the projection lens 8, and uniform, efficient and cheap illumination is realized.

The illumination reflector 3 is made of a mirror aluminum plate cut to a desired size, preferably 1.2mm thick, having a total reflectance of 95% or more by Alanod, Germany.

The heat dissipation assembly comprises a radiator 9, an external fan 10, an air guide cover 11, a heat exchange assembly 12, an internal fan 13, a heat spreader 14 and a return air pipe 15.

The LED light source 1 is positioned at the light source mounting opening, the projection lens 8 is positioned at the lens mounting opening, the illumination reflector 3 is positioned at the reflector mounting opening, and the radiator 9 is positioned outside the optical machine shell and is attached to the LED light source 1 for mounting; the heat exchange assembly 12 is arranged at the heat exchange mounting opening, so that the inside of the optical housing is sealed and isolated from the outside air, and complete air sealing and isolation are realized.

The condenser lens 2, the collimating lens 4, the heat reflecting glass 19, the LCD light valve 5, the field lens 6 and the imaging reflector 7 are positioned in the optical machine shell.

Referring to fig. 7, Ls is the long side of the display window 51 of the LCD light valve 5, Ss is the short side of the display window 51, x 'is the bisector of Ss, and y' is the bisector of Ls.

When viewed along the light path traveling direction, the illumination reflector 3 performs reflective turning in the up-down direction on the light irradiating the LCD light valve 5, that is, after the illumination reflector 3 is disposed, the light originally irradiating the upper region (the upper side of x ' in fig. 7) of the LCD light valve 5 is specularly irradiated on the lower region of the LCD light valve 5 along the horizontal bisector (x ' in fig. 7) of the display window 51, and similarly, the light originally irradiating the lower region (the lower side of x ' in fig. 7) of the LCD light valve 5 is specularly irradiated on the upper region of the LCD light valve 5. The imaging reflector 7 performs mirror image reflection turning in the left-right direction on the light emitted from the LCD light valve 5, i.e. along the perpendicular bisector (y 'in fig. 7) of the display window 51 of the LCD light valve 5, because of the presence of the imaging reflector 7, the light emitted from the LCD light valve 5 is mirrored in the left-right direction (y') when reaching the projection lens 8.

The external fan 10 is located outside the optical-mechanical housing and connected with the optical-mechanical housing; inside fan 13 install in inside the ray apparatus casing, turbofan is chooseed for use to inside fan 13, and the quantity is one or more, and inside fan 13 is 2 in this embodiment to obtain great wind pressure.

A first channel is enclosed among the condensing lens 2, the reflecting surface of the illuminating reflector 3 and the incident surface of the collimating lens 4; a second channel is defined between the emergent surface of the collimating lens 4 and the incident surface of the heat reflecting glass 19; a third channel is defined between the emergent surface of the heat reflecting glass 19 and the incident surface of the LCD light valve 5; a fourth channel is enclosed between the emergent surface of the LCD light valve 5 and the incident surface of the field lens 6; the air return pipe 15 is located outside the optical machine shell, one end of the air return pipe is communicated with the first channel, and the other end of the air return pipe is communicated with an air inlet of the internal fan 13.

The heat exchange assembly 12 includes a heat absorption part 121 located inside the optical housing, and a heat release part 122 connected to the heat absorption part 121 and located outside the optical housing; an air outlet of the internal fan 13 is aligned with one end of the heat absorbing part 121, and the other end of the heat absorbing part 121 is opposite to the second channel, the third channel and the fourth channel; the heat radiating section 122 is arranged in parallel with the radiator 9; the heat spreader 14 is attached to the outer surface of the illumination reflector 3.

When the forced air generated by the internal fan 13 flows through the heat absorbing part 121, the air collides with the heat absorbing part 121 to transfer heat to the heat absorbing part 121, and the heat absorbing part 121 transfers heat to the heat radiating part 122 with extremely low thermal resistance, wherein the forced air flows through the heat absorbing part 121After divided into a first part of the air flowaAnd a second partial wind flow b;the second part of the air flow b flows back to the air inlet of the internal fan 13 after radiating heat on the emergent surface of the LCD light valve 5 in the fourth channel; a part of the first part of the air flow a is radiated to the incident surface of the LCD light valve 5 in the third channel and then flows back to the air inlet of the internal blower 13, and another part of the first part of the air flow a flows through the second channel, the first channel and the inner wall of the air return pipe 15 in sequence and then flows back to the air inlet of the internal blower 13. In the second channel, the other part of the air flow c dissipates heat to the incident surface of the heat reflecting glass 19, in the first channel, the other part of the air flow c collides with the reflecting surface of the illumination reflector 3, the heat carried by the other part of the air flow c is transferred to the illumination reflector 3, further, inside the air return pipe 15, the other part of the air flow c collides with the inner wall of the air return pipe 15, the residual heat is continuously and efficiently transferred to the air return pipe 15, and the heat is diffused into the atmosphere through the heat diffuser 14 attached to the outer wall of the illumination reflector 3 and the outer wall of the air return pipe 15. Inside the projection light machine, the device for heating the circulating air mainly comprises an LCD light valve 5 and a heat reflecting glass 19, and the part for absorbing the heat of the circulating air mainly comprises a heat absorbing part 121 of a heat exchange assembly 12, a reflecting surface of an illuminating reflector 3 and the inner wall of an air return pipe 15; outside the projection light engine, the heat releasing part 122 of the heat exchanging component 12, the heat spreader 14 and the outer wall of the air return pipe 15 diffuse the corresponding heat into the air to maintain the heat balance of the temperature rise inside the light engine.

The air inlet of the external fan 10 is opposite to the heat spreader 14, the air outlet of the external fan 10 is connected with the air guide cover 11, the air outlet of the air guide cover 11 is aligned to the radiator 9 and the heat release part 122, so that the heat release part 122 of the LED light source 1 and the heat exchange component 12 can be simultaneously and efficiently dissipated through the external fan 10, the heat inside the projection light machine is taken away by the external fan 10, and the cooling of the air inside the projection light machine is realized. In the case of the fully sealed LCD projector released by the current industry, there is no case of blowing the heat releasing part of the heat exchanging assembly 12 by a blower due to the relationship of layout, volume, cost, and the like. Preferably, the external fan 10 employs a turbofan.

In the present embodiment, the heat sink 9, the heat radiating portion 122, and the heat spreader 14 are preferably straight-rib aluminum heat sinks, which are inexpensive and free from problems such as durability and quality variation of the heat pipe heat sink. Wherein the air inlet of the external fan 10 and the ribs of the heat spreader 14 are oriented oppositely. The air outlet of the air guide cover 11 faces the ribs of the heat sink 9 and the heat radiating portion 122.

In this embodiment, the heat absorbing part 121 is composed of a plurality of metal sheets arranged side by side, and a gap is reserved between adjacent metal sheets to form a ventilation heat absorbing pipeline. The metal sheet is preferably made of red copper, the thickness ratio of the gap to the metal sheet is 3-4: 1, the thickness of the metal sheet in the embodiment is 0.4mm, and the gap is 1.4 mm.

In the existing projection optical path structure using two mirrors, the turning directions of the two mirrors for reflecting light are the same, and the turning directions are the same as the left-right direction (along y 'in fig. 7) or the up-down direction (along x' in fig. 7). In the embodiment, the illumination reflector 3 and the imaging reflector 7 are in reflection combination in different directions (see fig. 7, the illumination reflector 3 reflects light rays along x 'and the imaging reflector 7 reflects light rays along y'), so that a brand-new light path structure shape is obtained, and a brand-new optical machine stack and influence are created, and the shape of the projector is determined, which is different from the existing projector shape of a horizontal type (see fig. 9, w '/h' is usually more than or equal to 2, P 'is a projection lens) or a vertical type (see fig. 10, h'/w 'is between 1.18 and 2.5, and P' is the projection lens), so that a new choice is provided for a user.

Compared with an open light path, the sealed semi-vertical LCD projector light machine provided by the embodiment has excellent durability and weather resistance, and provides more lasting value for users.

The sealed semi-vertical LCD projection light machine that this embodiment provided, on improving the basis of traditional sealed light machine inside and outside heat exchange, add the heat absorption heat dissipation of heat spreader 14 and return air duct 15, connected the first passageway at prior art heat dissipation dead angle and inside fan 13 for the inside and outside heat transfer ability of projection light machine can promote more than one time.

Referring to fig. 1 and 6, the heat exchange assembly 12 further includes a flow guiding member 123 and a flow dividing member 124 installed in the heat absorbing part 121; the flow guide member 123 and the flow dividing member 124 are in an arc-shaped thin sheet structure; the flow dividing member 124 divides the forced air flow generated by the inner fan 13 into a first partial air flow a and a second partial air flow b; the flow guiding element 123 is used for guiding the first partial wind flow a, and the flow guiding element 123 is configured to reduce the wind resistance of the first partial wind flow a.

Referring to fig. 1 and 2, the heat dissipation assembly further includes a first air guiding portion 20 located in the optical-mechanical housing and used for guiding the flow of the fourth channel, a second air guiding portion 21 located in the optical-mechanical housing and used for guiding the flow of the third channel, and a third air guiding portion 22 located in the optical-mechanical housing and used for connecting the first channel and the second channel. The first air guiding part 20 is disposed on an inner wall of the optical engine cover plate 17. The inner wall of the air duct cover plate 16 is provided with a second air guiding part 21, and a third air guiding part 22 connecting the second channel and the first channel. The air guide parts are in a streamline surface shape so as to reduce the wind resistance of the internal wind flow.

In this embodiment, the flow guide member 123 and the flow dividing member 124 are disposed inside the heat exchange assembly 12, and the air guide portions are disposed on the channels, so that the wind resistance of the air flow circulation loop inside the projection light machine is reduced, and the heat exchange coefficient of the heat dissipation system is improved. The projector creates favorable basic conditions for outputting higher brightness.

In this embodiment, the air return pipe 15 is made of a metal material, and further, the air return pipe 15 is provided with a heat diffusion structure, as shown in fig. 8, rib-shaped heat diffusion structures are respectively formed on the inner wall and the outer wall of the air return pipe 15, so as to further cool the air flowing through the inside of the air return pipe 15.

In the existing projector, a piece of heat-reflecting glass 19 (i.e. a DBEF or APF film is attached to a piece of white board glass, and a general film is attached to an incident surface) made of a film material such as DBEF (dual Br illumination Enhancement film) or APF (advanced Polarizer film) of 3M company in the united states is disposed about 2-3mm behind the exit surface of the collimating lens 4, so as to facilitate significant cooling of the LCD light valve 5, which has become a common practice in the industry. The film material reflects one path of linearly polarized light which is useless for the LCD light valve 5 in the illumination light and only transmits one path of linearly polarized light which is useful for the LCD light valve 5. Theoretically, therefore, the light illuminating the LCD light valve 5 is doubled and the heat generation is reduced by a factor of 1. The part of the reflected light is reflected back and forth or diffusely reflected for many times in the inner part of the optical machine shell and the light path, and finally is absorbed and converted into heat by the optical machine shell and the optical device. The optical machine shell is generally made of common plastic materials in consideration of cost, for example, the heat conductivity coefficient of common ABS plastic is only 0.02-0.046W/m.K, almost no heat is conducted, and the optical machine shell also has an excellent heat preservation effect, so that once the heat is deposited inside the projection optical machine, the heat is difficult to be quickly dissipated, which is a key factor that the brightness of the traditional full-sealed optical machine is restricted, the light irradiating the LCD light valve 5 is doubled, and the working environment of the LCD light valve 5 is not equal to the working environment improved by one time.

The heat reflecting glass 19 reflects more than 50% of the light back, which heat has not been noticed in the past, and is not considered to endanger the safety of the LCD light valve 5, but actually raises the temperature of the whole projector light engine, as in the first channel described above, on which no heat dissipation measures have been taken by people.

An existing optical machine with an illumination reflector 3 arranged between an LED light source 1 and a collimating lens 4 is habitually used in the industry for an aluminum film reflector with high selectivity and price ratio (namely, an aluminum reflective film is deposited or vacuum-plated on the surface of a flat glass substrate), the reflectivity of the aluminum film reflector is low (usually 82-86%), and the heat conductivity of the glass substrate is extremely poor (the heat conductivity coefficient is about 0.8-1W/m.k). The above-mentioned useless light, can be inside the ray apparatus casing, between the base plate surface of heat reflecting glass 19 and LED light source 1, carry out the repeated reflection of continuous round trip, reach illumination reflector 3 each time, all can absorb 14-18% heat (luminous power), and condensing lens 2, collimating lens 4, the absorptivity is just much lower relatively speaking, so above-mentioned useless light, most is absorbed by ray apparatus casing and illumination reflector 3 that the first passageway corresponds, so dispel the heat to the ray apparatus casing that the first passageway corresponds, and go out the inside heat diffusion through illumination reflector 3, be a reasonable measure.

The other part of the wind flow c flows over the surface of the illumination reflector 3 to transfer the heat to the illumination reflector 3, but in the present embodiment, the illumination reflector 3 is preferably made of a mirror aluminum plate, wherein the thermal conductivity of the mirror aluminum plate is close to the index of pure aluminum, so that the heat is further efficiently transferred to the heat spreader 14, and most of the heat of the above-mentioned unwanted light is diffused into the atmosphere by the external fan 10. The arrangement of the return air pipe 15, besides innovatively communicating the first channel with the internal blower 13, further diffuses the residual heat into the atmosphere.

The sealed semi-vertical LCD projection optical machine that this embodiment provided still makes overall structure simple through light source installing port, camera lens installing port, heat transfer installing port, speculum installing port, has effectively solved complicated, the loaded down with trivial details engineering technical problem of preparation of current totally enclosed LCD projection optical machine structure.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A closed semi-vertical LCD projection optical machine is characterized by comprising an optical machine shell, an optical component and a heat dissipation component; the optical machine shell is provided with a light source mounting port, a lens mounting port, a heat exchange mounting port and a reflector mounting port; the optical assembly comprises an LED light source (1), a condenser (2), an illumination reflector (3), a collimating lens (4), heat reflecting glass (19), an LCD light valve (5), a field lens (6), an imaging reflector (7) and a projection lens (8) which are sequentially arranged in the light advancing direction;

the heat dissipation assembly comprises a radiator (9), an external fan (10), an air guide cover (11), a heat exchange assembly (12), an internal fan (13), a heat spreader (14) and a return air pipe (15);

the LED light source (1) is positioned at the light source mounting port, the projection lens (8) is positioned at the lens mounting port, the illumination reflector (3) is positioned at the reflector mounting port, the radiator (9) is positioned outside the optical machine shell and is arranged by being attached to the LED light source (1), and the heat exchange assembly (12) is arranged at the heat exchange mounting port, so that the inside of the optical machine shell is sealed and isolated from the outside air;

the condenser lens (2), the collimating lens (4), the heat reflecting glass (19), the LCD light valve (5), the field lens (6) and the imaging reflector (7) are positioned in the optical machine shell;

the illumination reflector (3) reflects and turns the light irradiating the LCD light valve (5) in the up-down direction, and the imaging reflector (7) reflects and turns the light emergent from the LCD light valve (5) in the left-right direction;

the external fan (10) is positioned outside the optical machine shell and is connected with the outer wall of the optical machine shell; the internal fan (13) is arranged inside the optical shell;

a first channel is enclosed among the condensing lens (2), the reflecting surface of the illuminating reflector (3) and the incident surface of the collimating lens (4); a second channel is enclosed between the emergent surface of the collimating lens (4) and the incident surface of the heat reflecting glass (19); a third channel is enclosed between the exit surface of the heat reflecting glass (19) and the incident surface of the LCD light valve (5); a fourth channel is enclosed between the emergent surface of the LCD light valve (5) and the incident surface of the field lens (6); the air return pipe (15) is positioned outside the optical engine shell, one end of the air return pipe (15) is communicated with the first channel, and the other end of the air return pipe is communicated with an air inlet of the internal fan (13);

the heat exchange component (12) comprises a heat absorption part (121) positioned in the optical machine shell and a heat release part (122) connected with the heat absorption part (121) and positioned outside the optical machine shell; the air outlet of the internal fan (13) is aligned with one end of the heat absorption part (121), and the other end of the heat absorption part (121) is opposite to the second channel, the third channel and the fourth channel; the heat radiation part (122) and the radiator (9) are arranged in parallel; the heat spreader (14) is attached to the outer surface of the illumination reflector (3);

forced air generated by the internal fan (13) flows through the heat absorption part (121) and then is divided into a first part of air flow and a second part of air flow; wherein a second part of the air flows through the fourth channel and flows back to the air inlet of the internal fan (13); one part of the first part of air flows through the third channel and then flows back to the air inlet of the internal fan (13); the other part of the first part of the air flow flows through the second channel, the first channel and the air return pipe (15) in sequence and then flows back to the air inlet of the internal fan (13);

the air inlet of the external fan (10) is opposite to the heat spreader (14), and the air outlet of the external fan (10) is connected with the air guide cover (11); the air outlet of the air guide cover (11) is aligned with the radiator (9) and the heat release part (122).

2. The hermetic semi-vertical LCD projector light machine according to claim 1, characterized in that the illumination reflector (3) is a specular aluminum plate.

3. The hermetic semi-vertical LCD projector as claimed in claim 1, wherein the condenser (2) is a plano-convex lens, the plane is toward the LED light source (1), and the convex surface is an anamorphic aspheric surface or an XY polynomial free-form surface.

4. The hermetic semi-vertical LCD projector as claimed in claim 1, wherein the heat exchange assembly (12) further comprises a flow guiding member (123) and a flow dividing member (124) installed in the heat absorbing part (121); the flow guide piece (123) and the flow dividing piece (124) are of arc-shaped thin sheet structures; the flow divider (124) divides the forced air flow generated by the internal fan (13) into the first partial air flow and a second partial air flow; the flow guide piece (123) is used for guiding the first part of wind flow.

5. The enclosed semi-vertical LCD projector as recited in claim 1, wherein the heat dissipation assembly further comprises a first air guiding portion (20) disposed in the light engine housing and used for guiding the flow of the fourth channel, a second air guiding portion (21) disposed in the light engine housing and used for guiding the flow of the third channel, and a third air guiding portion (22) disposed in the light engine housing and used for connecting the first channel and the second channel.

6. The hermetic semi-vertical LCD projector as claimed in claim 1, wherein the number of the internal blower (13) is one or more, and the internal blower (13) is a turbo fan.

7. The hermetic semi-vertical LCD projector as claimed in claim 1, wherein the external fan (10) is a turbofan.

8. The hermetic semi-vertical LCD projector as claimed in claim 1, wherein the heat sink (9), the heat releasing part (122) and the heat spreader (14) are straight-rib aluminum heat sinks.

9. The hermetic semi-vertical LCD projector as claimed in claim 1, wherein the air return duct (15) is made of metal.

10. The LCD projector as claimed in claim 9, wherein the heat dissipation assembly further comprises heat diffusion structures disposed on the inner and outer walls of the air return duct (15).