CN113204160A

CN113204160A - Semi-vertical LCD projector and semi-vertical LCD projector

Info

Publication number: CN113204160A
Application number: CN202110542792.5A
Authority: CN
Inventors: 陈灵
Original assignee: Individual
Current assignee: Shenzhen Liangzi Photoelectric Technology Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-08-03

Abstract

The invention discloses a 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 inlet, a light outlet, a first ventilation opening and a second ventilation opening; the optical assembly comprises an LED light source, a condenser lens, an illumination reflector, a collimating lens, 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 invention also provides a semi-vertical LCD projector, which comprises the semi-vertical LCD projector, a projector shell, an LCD drive board, a switching power supply and a sound box. The invention obtains a brand-new optical path structure shape, creates brand-new stacking and a brand-new projector appearance, and has the advantages of novel appearance, low cost, small volume and complete integration level of raw materials.

Description

Semi-vertical LCD projector and semi-vertical LCD projector

Technical Field

The invention relates to the field of projectors, in particular to a semi-vertical LCD projector and a semi-vertical LCD projector.

Background

In 2020, the shipment volume of the single LCD projector is newly created, and the single LCD projector takes ten million major relations, wherein most products mainly take export as a main part and take internal sales as an auxiliary part. The core requirements for exporting products generally can be summarized by three key elements: fashionable appearance, small volume and low cost. The formation of the key elements is determined due to the practical conditions of transnational transportation, overseas warehousing, international e-commerce platform commission and the like, and the key elements are the direction in which vast industry manufacturers need to make better efforts in the future for a long time.

The appearance of the single LCD projector has two forms at present, namely the traditional horizontal type projector, as shown in figure 10; secondly, the novel vertical type in recent years is shown in figure 11.

The salient features of the appearance of the single LCD projector shown in fig. 10 are: the width w '(equivalent to the width of the projector) of the front panel of the projector shell is obviously larger than the height h' (equivalent to the height of the projector), generally, w '/h' is more than 2 times, and the appearance of the whole projector is in a lying state, so people are commonly called to be in a lying state. The horizontal single LCD projector has a long history of more than 30 years, so the horizontal single LCD projector has the advantages of mature technology, wide matching, high cost performance and the like. However, the appearance of the optical system is almost invariable for decades, the design of an appearance which looks bright ahead is difficult, elements such as fashion, beauty and individuality which are pursued by consumer digital products are difficult to find and combine with each other, and the utilization rate of the internal space is not high (the internal space is almost surrounded by the optical system and the projector shell to form a plurality of triangles, which causes difficulty in reasonable utilization compared with the optical system with regular appearance such as a switching power supply, an LCD driving board and a radiator), and the volume of the optical system with the same index is relatively large. In fig. 10, P' is a projection lens.

The salient features determined by the appearance of the stand-type single LCD projector shown in fig. 11 are: the width w '(equivalent to the width of the projector) of the front panel of the projector shell is obviously smaller than the height h' (equivalent to the height of the projector), the individual product h '/w' is about 1.2 times (the current lowest value), more products are about 2 times or more, and the appearance of the whole projector is in a standing state. The product form has the advantages of small volume, novelty, fresh feeling and impact feeling to consumers, and the like. However, the defects of high product gravity center, immature internal stacking, high product manufacturing difficulty, low cost performance and the like exist, and particularly, the integration integrity required by the whole machine such as the improvement of heat dissipation performance, the built-in switching power supply, the built-in loudspeaker box with larger power and the like exists in a very sharp contradiction with the reasonable increase of the whole machine volume and the establishment of novel appearance and shape. In FIG. 11, P' is the projection lens.

Therefore, how to better satisfy the requirements of fashion appearance, small size and low cost of projector products in the international market becomes a problem to be continuously solved by technical personnel in the field.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a semi-vertical LCD projector, obtains a brand-new light path structure shape, and creates brand-new stacking and the appearance and the characteristics of the projector: novel appearance, low cost, small in size, sound effect is better, and raw and other materials have complete integrated level etc..

In order to achieve the above object, the present invention provides a semi-vertical LCD projection optical machine, which comprises an optical machine housing, an optical assembly and a heat dissipation assembly, wherein the optical machine housing is provided with a light inlet, a light outlet, a first ventilation opening and a second ventilation opening; the optical assembly comprises an LED light source, a condenser lens, an illumination reflector, a collimating lens, an LCD light valve, a field lens, an imaging reflector and a projection lens which are sequentially arranged according to the light advancing direction, wherein the LED light source is positioned at the light inlet of the optical machine shell, and the projection lens is positioned at the light outlet of the optical machine shell; the condenser lens, the illumination reflector, the collimating lens, 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.

A first channel is defined between the incident surfaces of the condenser lens and the illumination reflector and between the incident surfaces of the collimating lens; a second channel is enclosed between the emergent surface of the collimating lens and the incident surface of the LCD light valve; a third channel is enclosed between the emergent surface of the LCD light valve and the incident surface of the field lens; a fourth channel is defined between the back surface of the illumination reflector and the inner side surface of the optical machine shell; and the inlet of the first channel, the inlet of the second channel, the inlet of the third channel and the inlet of the fourth channel are communicated with the first ventilation opening.

The heat dissipation assembly comprises a radiator, a fan and an air guide cover, and is positioned outside the optical machine shell; the fan is connected with the optical machine shell, and an air inlet of the fan is aligned to the second ventilation opening; and the outlet of the first channel, the outlet of the second channel, the outlet of the third channel and the outlet of the fourth channel are communicated with the second ventilation opening.

The fan and the projection lens are positioned on the same side; the radiator is arranged in a manner of being attached to the LED light source; the radiator is covered outside the air guide cover and is connected with the optical machine shell, and the air inlet of the air guide cover is communicated with the air outlet of the fan.

The invention obtains a brand new light path structure shape by the mirror reflection combination of the illumination reflector and the imaging reflector in different directions, realizes the heat dissipation of the optical system through a fan, creates brand new stacking and brand new projector appearance, obviously reduces the whole machine volume of the existing projector stacking mode, obviously increases the utilization rate of the internal space of the projector, and has very obvious innovation effect on further rationalizing the design of increasing the heat dissipation and sound effect. The whole machine raw material stacking based on the light path structure provides a brand-new semi-vertical appearance form for the appearance of the projector for users to select, has the remarkable advantages of smaller volume, low cost, novel appearance and the like, and can bring freshness and impact feeling to consumers.

Optionally, the illumination reflector is a flat reflector with a reflective film made on a flat glass.

Preferably, the illumination reflector is made of a mirror aluminum plate.

The invention also provides a semi-vertical LCD projector, which comprises the semi-vertical LCD projector, a projector shell, an LCD drive board, a switching power supply and a sound box; the semi-vertical LCD projector, the LCD drive board, the switching power supply and the sound box are all positioned in the projector shell; a first space is defined between the lower surface of the optical machine shell corresponding to the lower part of the projection lens and the inner side surface of the projector shell, and the switching power supply is positioned in the first space.

A second space is enclosed between the outer side surface of the optical machine shell corresponding to the back surface of the imaging reflector and the inner side surface of the projector shell; a third space is enclosed between the outer side surface of the optical machine shell corresponding to the back surface of the illumination reflector and the inner side surface of the projector shell; the sound box is located in the second space and/or the third space.

And a fourth space is defined between the upper surface of the optical machine shell corresponding to the upper part of the projection lens and the inner side surface of the projector shell, and the LCD drive board is positioned in the fourth space.

The first space is a regular space and is used for a built-in switching power supply, and the size of the projector is not required to be additionally increased. Even for the very sophisticated projector of fig. 10, the same efficient utilization of the stack as in the present invention is not achieved.

The second space and the third space have large spaces, and sound boxes with large volumes can be arranged without additionally increasing the volume of the projector so as to obtain good sound effect and increase the satisfaction degree of user experience.

The fourth space of the invention just utilizes to place the LCD driving board without additionally increasing the volume of the projector. The efficient utilization of the first to fourth spaces is completely absent from the conventional projector shown in fig. 11, and an objective foundation is created for obtaining an extremely small overall size according to the present invention.

Compared with the existing horizontal projector, the projector has the advantages of novel appearance, smaller volume and low cost; compared with the existing vertical projector, the vertical projector has the advantages of more harmonious and smaller appearance, complete integration level, larger volume of the sound box and better cost performance, and provides a brand new choice for the market.

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 perspective view of a projector;

FIG. 2 is a perspective view of FIG. 1 rotated by a certain angle;

FIG. 3 is a perspective view of FIG. 2 taken away;

FIG. 4 is a perspective view of FIG. 2 after being cut flat;

FIG. 5 is a perspective view of an optical assembly of the present invention;

FIG. 6 is a perspective view of the heat sink assembly and LED light source of the present invention;

FIG. 7 is a perspective view of the projector of the present invention;

FIG. 8 is a perspective view of the projector housing of FIG. 7, partially cut away;

FIG. 9 is a schematic view of a bisector of a display window of the LCD light valve;

FIG. 10 is a schematic view of a conventional horizontal projector;

fig. 11 is a schematic view 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.

Example one

As shown in fig. 1-6 and fig. 9, the semi-vertical LCD projection optical engine provided in this embodiment includes an optical engine housing 12, an optical assembly and a heat dissipation assembly; the optical machine shell 12 is provided with a light inlet, a light outlet, a first ventilation opening and a second ventilation opening; the optical assembly comprises an LED light source 1, a condenser lens 2, an illuminating reflector 3, a collimating lens 4, 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 advancing direction, wherein the LED light source 1 is positioned at a light inlet of the optical machine shell 12, and the projection lens 8 is positioned at a light outlet of the optical machine shell 12; the condenser lens 2, the illumination reflector 3, the collimating lens 4, the LCD light valve 5, the field lens 6 and the imaging reflector 7 are positioned in the optical machine shell 12.

In this embodiment, the illumination reflector 3 performs vertical reflective turning on the light irradiated to the LCD light valve 5, and the imaging reflector 7 performs horizontal mirror reflective turning on the light emitted from the LCD light valve 5.

Referring to fig. 9, 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. 9) 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. 9) of the display window 51, and similarly, the light originally irradiating the lower region (the lower side of x ' in fig. 9) 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. 9) 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.

A first channel 21 is defined between the condensing lens 2, the incident plane of the illumination reflector 3 and the incident plane of the collimating lens 4; a second channel 22 is defined between the emergent surface of the collimating lens 4 and the incident surface of the LCD light valve 5; a third channel 23 is defined between the emergent surface of the LCD light valve 5 and the incident surface of the field lens 6; a fourth channel 24 is defined between the back surface of the illumination reflector 3 and the inner side surface of the optical machine shell 12; and the inlet of the first channel 21, the inlet of the second channel 22, the inlet of the third channel 23 and the inlet of the fourth channel 24 are communicated with the first ventilation opening.

The heat dissipation assembly comprises a radiator 9, a fan 10 and an air guide cover 11, and is positioned outside the optical machine shell 12; the fan 10 is connected with the optical machine shell 12, and an air inlet of the fan 10 is aligned with the second ventilation opening; and the outlet of the first channel 21, the outlet of the second channel 22, the outlet of the third channel 23 and the outlet of the fourth channel 24 are communicated with the second ventilation opening.

The fan 10 and the projection lens 8 are positioned on the same side; the radiator 9 is arranged to be attached to the LED light source 1; the air guide cover 11 covers the radiator 9 and is connected with the optical machine shell 12, and an air inlet of the air guide cover 11 is communicated with an air outlet of the fan 10.

In the existing projection optical path structure using two mirrors, the turning directions of the two mirrors for the mirror reflection of light are the same, and the turning directions are the same as the left and right (horizontal) directions or the up and down (vertical) directions. In the embodiment, the illuminating reflector 3 reflects and turns light irradiating on the LCD light valve 5 in the up-down direction, and the imaging reflector 7 reflects and turns light emergent from the LCD light valve 5 in the left-right direction, that is, the illuminating reflector 3 and the imaging reflector 7 are mirror reflection combinations in different directions, so that a brand new light path structure shape is obtained, and heat dissipation of an optical system is realized by a fan 10, so that brand new stacking and brand new projector shapes are created, the whole volume of the existing projector stacking mode is remarkably reduced, the utilization rate of the internal space of the projector is remarkably increased, and the design of further increasing the heat dissipation and sound effects in a reasonable manner has a very obvious innovation effect. The whole machine raw material stacking based on the optical path structure provides a brand-new semi-vertical appearance form for the appearance of the projector for users to select, has extremely small volume, low cost, novel appearance and complete integration level, and can bring more fresh and impact feelings to consumers.

In the embodiment, under the action of the fan 10, the external cold air is forcedly sucked into the first channel 21, the second channel 22, the third channel 23 and the fourth channel 24 through the first vent, the heat of the LCD light valve 5 and the illumination reflector 3 is efficiently taken away and reaches the second vent, the fan 10 continuously acts, and the air completes the forced cooling of the radiator 9 through the air guide cover 11.

It has become common practice in the industry to facilitate significant cooling of the LCD light valve 5 by placing a sheet of material such as dbef (dual Brightness Enhancement film) from 3M between the collimating lens 4 and the entrance face of the LCD light valve 5. The DBEF reflects one of the illumination lights, which is useless to the LCD light valve 5, and transmits only one of the illumination lights, which is useful to the LCD light valve 5. So theoretically, the heat of the LCD light valve 5 will be reduced by at least a factor of 1. This portion of the reflected light will eventually be dissipated by the projector as heat.

In the existing single LCD projector adopting two reflectors, the illumination reflector 3 positioned between the condenser 2 and the collimating lens 4 is an aluminum film reflector with high cost performance (an aluminum reflective film is deposited or vacuum-plated on the surface of a flat glass substrate) which is habitually selected by the industry, 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 0.8-1 w/m.k). The useless light rays are reflected repeatedly back and forth between the DBEF and the surface of the substrate of the LED light source continuously, and each time the useless light rays reach the lighting reflector, the lighting reflector absorbs 14-18% of heat (light power), so that the temperature of the lighting reflector is extremely high, for example, the temperature of a 100W power LED light source, the temperature of an aluminum reflecting film and a glass substrate of the lighting reflector can easily exceed 80 ℃ if the lighting reflector naturally dissipates heat, the durability of the reflecting film is very short, and a plastic structural member of an optical system is influenced, so that the local baking paste, softening, deformation and other abnormalities are generated, and the projector is caused to be in failure. In order to solve the above problems, the illumination reflector 3 of the present embodiment is preferably a mirror aluminum plate, and for example, the mirror aluminum plate is "95% aluminum" (Alanod, e.g., model 4270GP), the regular reflectance is greater than or equal to 90%, the total reflectance is about 5%, the total reflectance is about 95%, and the absorbed heat is about 5%, and the mirror aluminum plate is forcibly cooled by the first channel 21 and the fourth channel 24 and is rapidly taken away by the fan 10, so that the temperature of the mirror aluminum plate is reduced, the mirror aluminum plate is maintained at a normal temperature state, the local temperature of the projector is further reduced, and the durability quality of the projector is improved.

In the present embodiment, "95% Al" has a thickness of 0.5mm or more, and the purchase cost is lower than that of the inexpensive Al film reflector by at least one time.

Example two

As shown in fig. 1 to 9, this embodiment further provides a semi-vertical LCD projector, which includes the semi-vertical LCD projector optical machine described in the first embodiment, and further includes a projector housing 31, an LCD driver board 32, a switching power supply 33, and a sound box 34. The semi-vertical LCD projector, the LCD driver board 32, the switch power supply 33 and the sound box 34 are all located in the projector shell 31. A first space is enclosed between the lower surface of the optical machine housing 12 corresponding to the lower portion of the projection lens 8 and the inner side surface of the projector housing 31, and the switching power supply 33 is located in the first space.

A second space is enclosed between the outer side surface of the optical machine shell 12 corresponding to the back surface of the imaging reflector 7 and the inner side surface of the projector shell 31; a third space is enclosed between the outer side surface of the optical machine housing 12 corresponding to the back surface of the illumination reflector 3 and the inner side surface of the projector housing 31.

If the number of the sound boxes is one, the sound boxes are positioned in the second space (as shown in fig. 8) or the third space; if the space is stereo (two sound boxes), one sound box is located in the second space, and the other sound box is located in the third space.

A fourth space is enclosed between the upper surface of the optical-mechanical housing 12 corresponding to the upper side of the projection lens 8 and the inner side surface of the projector housing 31, and the LCD driving board 32 is located in the fourth space.

The first space of the present embodiment is a regular space, can be efficiently used, and is provided with the switching power supply 33 inside. And compared with the mode of adopting an external power adapter because the switch power supply 33 cannot be built in due to volume restriction, the cost can be effectively reduced, the integration level of the projector is increased, and the convenience in use is brought to users. The built-in switching power supply 33 is also a relatively cumbersome matter to stack up for existing horizontal projectors, usually at the expense of the external dimensions of the projector. However, in the conventional vertical projector, the switching power supply 33 needs to be built in under the premise of considering the size, the shape and the like, and in view of the fact that people do not have a mature experience (not only the size, but also the engineering problems such as heat dissipation of the switching power supply and the like), currently, a vertical single LCD projector with a built-in switching power supply does not exist in the market, and an external power adapter is provided for an end user.

The second space and the third space of the embodiment have large spaces, and are very suitable for placing a stereo sound box with a large volume, so that a good sound effect can be obtained, and the satisfaction degree of user experience is increased. This is hardly possible with the existing vertical projectors, still taking into account the volume, the shape, etc.

Taking the 3.5 inch LCD light valve 5 from BOE (beige) as an example, the size of the smaller model in the current industry is about 205mm by 90mm by 170mm (w '. times.h'. deep), and the volume is about 3.2L (L, volume unit: liter) as the aforementioned equivalent optical component design, the horizontal projector shown in fig. 10; as shown in fig. 11, the product, which is one of the excellent representatives of the smallest size in the current industry, has an external size of about 120mm × 142mm × 138mm (w ″ × h ″) and a volume of about 2.4L, and requires an external power adapter, and if the quality of the sound is required, an external bluetooth speaker is also required, and the integration level is not complete. As shown in fig. 8, the half-stand LCD projector of the present embodiment has a width w of about 148mm, a height h of about 108mm, a depth of about 128mm, and a volume of about 2L, and has a complete integration level. Therefore, compared with the existing horizontal projector and the vertical projector, the semi-vertical LCD projector of the present embodiment has a smaller volume and a significant volume advantage. Meanwhile, the h/w of the semi-vertical LCD projector is about 0.73, or the w/h is about 1.37, compared with the appearance of a constant horizontal projector, the semi-vertical LCD projector is more novel in product and very obvious in volume advantage; compared with the existing vertical projector, the projector has the advantages of more harmonious appearance, complete integration level, larger volume of the sound box, better cost performance and smaller volume, and provides a brand new choice for the market.

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. The semi-vertical LCD projection optical machine is characterized by comprising an optical machine shell (12), an optical assembly and a heat dissipation assembly, wherein the optical machine shell (12) is provided with a light inlet, a light outlet, a first ventilation opening and a second ventilation opening; the optical assembly comprises an LED light source (1), a condenser (2), an illumination reflector (3), a collimating lens (4), 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 advancing direction, the LED light source (1) is positioned at a light inlet of the optical machine shell (12), and the projection lens (8) is positioned at a light outlet of the optical machine shell (12); the condenser lens (2), the illumination reflector (3), the collimating lens (4), the LCD light valve (5), the field lens (6) and the imaging reflector (7) are positioned in the optical machine shell (12);

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;

a first channel (21) is enclosed among the condensing lens (2), the incident plane of the illumination reflector (3) and the incident plane of the collimating lens (4); a second channel (22) is enclosed between the emergent surface of the collimating lens (4) and the incident surface of the LCD light valve (5); a third channel (23) is enclosed between the emergent surface of the LCD light valve (5) and the incident surface of the field lens (6); a fourth channel (24) is enclosed between the back surface of the illumination reflector (3) and the inner side surface of the optical machine shell (12); the inlet of the first channel (21), the inlet of the second channel (22), the inlet of the third channel (23) and the inlet of the fourth channel (24) are communicated with the first ventilation opening;

the heat dissipation assembly comprises a radiator (9), a fan (10) and an air guide cover (11), the heat dissipation assembly is located outside the optical machine shell (12), the fan (10) is connected with the optical machine shell (12), and an air inlet of the fan (10) is aligned to the second ventilation opening; the outlet of the first channel (21), the outlet of the second channel (22), the outlet of the third channel (23) and the outlet of the fourth channel (24) are communicated with the second ventilation opening;

the fan (10) and the projection lens (8) are positioned on the same side; the radiator (9) is arranged in a manner of being attached to the LED light source (1); the air guide cover (11) covers the radiator (9) and is connected with the optical machine shell (12), and an air inlet of the air guide cover (11) is communicated with an air outlet of the fan (10).

2. The semi-vertical LCD projection light engine according to claim 1, characterized in that the illumination reflector (3) is a plane reflector or a mirror aluminum plate with a reflective film made on a plate glass.

3. A semi-vertical LCD projector, comprising the semi-vertical LCD projector light machine of claim 1, further comprising a projector housing (31), an LCD driver board (32), a switching power supply (33) and a sound box (34); the semi-vertical LCD projector, the LCD drive board (32), the switching power supply (33) and the sound box (34) are all positioned in the projector shell (31); a first space is enclosed between the lower surface of the optical machine shell (12) corresponding to the lower part of the projection lens (8) and the inner side surface of the projector shell (31), and the switching power supply (33) is positioned in the first space;

a second space is enclosed between the outer side surface of the optical machine shell (12) corresponding to the back surface of the imaging reflector (7) and the inner side surface of the projector shell (31); a third space is enclosed between the outer side surface of the optical machine shell (12) corresponding to the back surface of the illumination reflector (3) and the inner side surface of the projector shell (31); the sound box (34) is positioned in the second space and/or the third space;

a fourth space is enclosed between the upper surface of the optical machine shell (12) corresponding to the upper part of the projection lens (8) and the inner side surface of the projector shell (31), and the LCD drive board (32) is located in the fourth space.