CN211123594U

CN211123594U - Projector with a light source

Info

Publication number: CN211123594U
Application number: CN201921791694.XU
Authority: CN
Inventors: 黄家斌; 林维赐
Original assignee: Young Optics Inc
Current assignee: Young Optics Inc
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-07-28
Anticipated expiration: 2029-10-23

Abstract

A projector including a light source; the transmissive liquid crystal panel is arranged at the downstream of the light path of the light source and is positioned in a flow channel communicated with the outside air; the projection lens is arranged on the downstream of the light path of the transmissive liquid crystal panel; the fan is arranged in the flow channel; the light path upstream of the projection lens only comprises a penetrating liquid crystal panel; the direction of the air flow of the flow channel at the position of the transmissive liquid crystal panel is substantially opposite to the direction of gravity.

Description

Projector with a light source

Technical Field

The present invention relates to a projector, and more particularly to a projector with a special heat dissipation design and a single-chip liquid crystal structure.

Background

In order to reduce the temperature in the projector, the projector may employ two approaches, i.e., an open type heat dissipation system and a closed type heat dissipation system.

The closed heat dissipation means that the projector casing can isolate the inside and outside of the projector and the heat energy in the casing can be led out of the projector by components such as a refrigeration chip or a heat conduction fin, and the closed type can effectively prevent external dust particles from entering the inside of the light machine and reduce the problem that the dust is adhered to the surface of a light valve to form black spots on a projection picture, but the cost is high and the heat dissipation effect is relatively poor.

The open type is that the inside and outside of the casing of the projector are communicated, generally speaking, the fan arranged inside or outside the casing can draw outside cold air into the casing and output the air through the air outlet, thereby dissipating heat. The open system has a low cost and a relatively good heat dissipation effect, but it may cause dust to adhere to the surface of the light valve and form black spots on the projection image. In order to solve the above mentioned black spot problem, a dust filter (dust filter) is usually installed at the air inlet of the machine type with higher price, but the service life of the dust filter is very limited, and the dust filter needs to be cleaned or replaced frequently, which causes inconvenience in use.

SUMMERY OF THE UTILITY MODEL

An embodiment of the present invention provides a projector with an open structure, which provides an ascending air current opposite to the gravity direction at the light valve and the wind inlet of the fan, and controls the flow rate and direction of the ascending air current, so that the weight of the dust with large particle size can be used to prevent the dust from entering the casing, thereby effectively preventing the dust with large particle size from adhering to the light valve. In addition, when the projector is equipped with the filter screen, an embodiment of the utility model discloses a life that can promote the filter screen effectively.

According to the present invention, a projector includes a projector, which includes a casing, a supporting member, a light source, a transmissive liquid crystal panel, a projection lens, and a fan. At least one support member is arranged on the bottom surface of the machine shell, and the support member extends outwards from the surface and is used for forming a gap between the machine shell and the surface on which the machine shell is placed; at least part of the volume of the light source, the transmissive liquid crystal plate, the projection lens, the fan and other components are located in the casing. The penetrating liquid crystal panel is arranged at the downstream of the light path of the light source and is positioned in a flow channel communicated with the outside air; the projection lens is arranged in the shell and is arranged at the downstream of the light path of the transmissive liquid crystal panel, and meanwhile, the upstream of the light path of the projection lens only comprises one transmissive liquid crystal panel; and the air flow is opposite to the extending direction of the support piece at the position of the transmission type liquid crystal panel. The fan is arranged in the shell and positioned in the flow channel and used for generating air flow.

According to the present invention, a projector includes a light source, a transmissive liquid crystal panel including a multicolor filter, a projection lens, a housing, and a fan. The transmission type liquid crystal panel is arranged at the downstream of the light source light path; the projection lens is arranged on the downstream of the light path of the transmissive liquid crystal panel; the shell is provided with a space for accommodating the light source and the transmissive liquid crystal panel and an opening, the opening is positioned on the bottom surface of the shell, and the opening is communicated with the inside and the outside of the shell; the fan is provided with an air inlet end at the opening and is a centrifugal fan. The transmissive liquid crystal panel, the fan and the opening are arranged in sequence from top to bottom.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1A is a schematic perspective view of a projector according to a first embodiment of the present invention.

Fig. 1B is a schematic diagram of the present invention shown in fig. 1A along the reference line a-a.

Fig. 1C is a schematic cross-sectional view of a transmissive liquid crystal panel according to a first embodiment of the present invention.

Fig. 1D is a schematic perspective view of the peripheral design of the blower shown in fig. 1B according to the present invention.

Fig. 2 is a perspective view of a fan peripheral design of a comparative projector.

Fig. 3A is a schematic perspective view illustrating a projector according to a second embodiment of the present invention.

Fig. 3B is a schematic diagram of the present invention shown in cross section along the reference line a-a of fig. 3A.

Detailed Description

Referring to fig. 1A, fig. 1B and fig. 1D, a perspective view of a projector, a cross-sectional view formed by a cross-section along a reference line a-a of fig. 1A, and a perspective view of a part of features of fig. 1B according to a first embodiment of the present invention are respectively shown.

As can be seen from the figure, the projector 1 of the present invention, when simplified, includes a casing 10, a fan 20, a light source 30, a transmissive liquid crystal panel 40, a projection lens 50 and a filter screen 60.

In this embodiment, the housing 10 is formed by combining an upper plastic component and a lower plastic component, and has a hollow rectangular structure, and an inner space for accommodating components such as the fan 20, the light source 30, the transmissive liquid crystal panel 40, the projection lens 50, and the filter 60 is disposed therein. The cabinet 10 is also a housing of the projector 1. The housing of the projector 1 is provided on the outermost side of the projector 1 and is a part of the appearance of the product. The housing 10 is not limited to being made of plastic, and the housing 10 can be made of other materials, such as metal or other organic materials, if necessary. In addition, the casing 10 is not limited to a rectangular shape, and the casing 10 may have other geometric shapes such as a circular shape, if necessary.

A plurality of supporting members 14 are provided on the bottom surface of the cabinet 10 to extend outward from the bottom surface. The support member 14 of the present invention is a structure, a machine member, or a mechanism formed by a plurality of machine members, which has a certain length and is capable of forming a gap between the projector 1 and the placement surface. For example, the support 14 may be a telescoping foot stand, a non-telescoping foot stand, a block of resiliently deformable material, or a block of non-resiliently deformable material, or a combination of the foregoing; the supporting member 14 may also be a protruding part of the casing 10 and formed integrally with the casing; the support 14 can be used to adjust the angle between the projector 1 and the mounting surface. In this example, the supporting members 14 are respectively a flat ball type elastic soft cushion. In the context of the application of the present example, the bottom surface 10A is facing the direction of gravity G. In addition, the other surface facing opposite to the gravity direction, opposite to the bottom surface 10A, is referred to as a top surface 10B, and the aforementioned bottom surface 10A and top surface 10B are connected by four side surfaces 10C.

The bottom surface 10A and the top surface 10B are respectively provided with at least one perforation set 10A1, 10B 1. In this example, the set of perforations 10A1, 10B1 comprise only one opening extending through the inside and outside of the surface on which they are located and are perforations. However, in another example, the perforation group 10a1 is composed of a plurality of round holes or long perforations arranged in a matrix. The sets of perforations 10A1, 10B1 communicate between the interior and exterior of the enclosure and allow free fluid communication on both sides thereof. The side wall 10C of the housing 10 has a light-transmitting region 10C1 for allowing light to pass through, and the light-transmitting region 10C1 corresponds to the light-emitting end of the projection lens 50.

In this embodiment, a flow guiding structure 11 is disposed on an inner side of the bottom surface 10A of the casing 10, opposite to an extending direction of the air outlet end E2 of the fan 20, or an air outlet direction. The baffle structure 11 extends and protrudes from the inside of the bottom surface 10A in the direction opposite to the gravity G, i.e., in the thickness direction Z of the projector 1. The guiding structure 11 has a guiding surface 11A, and the guiding surface 11A can be a curved surface or a bend. In this example, the wind guide surface 11A is a curved surface in the shape of a quarter sphere, for example. The air guide surface 11A converts a horizontal wind flow into a vertical wind flow to deliver air to the transmissive liquid crystal panel 40 above the air guide surface. The air guide surface 11A may extend in the width direction X and may be selectively as wide as the fan 20. In this embodiment, the diversion structure 11 is a separate component disposed on the bottom surface 10A of the housing 10. However, in another embodiment, the flow guiding structure 11 may be integrally FORMED with the casing 10 (onechip FORMED) and be a part of the casing 10, and the flow guiding structure 11 may also be a wind guiding cover connected to the wind outlet E2 of the fan 20 or be a part of the fan 20.

The fan 20 of the present invention is a motor that converts electric energy into aerodynamic energy by using a rotary impeller. The fan 20 includes a centrifugal fan (Blower), an axial fan (axial fan), and a cross-flow fan. The air inlet direction and the air outlet direction of the centrifugal fan and the cross-flow fan are substantially vertical to each other; the air inlet direction and the air outlet direction of the axial flow fan are substantially the same; in this example, the fan 20 is a centrifugal fan (blower), and in an application context of this example, the air inlet E1 of the fan 20 draws air from the outside of the projector 1 from bottom to top along a direction opposite to the gravity direction G, i.e., the directions D2 and Din, and the air is horizontally conveyed to the air guiding structure 11 along the direction D5 perpendicular to the gravity direction G through the air outlet E2 of the fan 20.

The light source 30 of the present invention is an electronic device capable of converting electrical energy into light energy, the light source 30 includes, for example, a metal halogen bulb, an ultra-high pressure mercury (UHE ) bulb, a xenon lamp, an incandescent lamp, etc. a white light source, or a light source provided by a plurality of groups of laser diode package modules of different colors or light emitting diode package modules in cooperation with a light combining component, in this example, the light source 30 is composed of a plurality of white L EDs, the total power consumption is about 40 watts, and when the total power consumption is above 5, 10, 20 watts, the brightness is good, better and better.

The transmissive liquid crystal panel 40, in this example, is used as a spatial light modulator or a light valve for converting the illumination beam into an image beam. In this embodiment, the transmissive liquid crystal panel 40 is a multi-color transmissive liquid crystal panel, such as a TFT liquid crystal panel, and includes a plurality of three-color filter material layers. That is, the liquid crystal panel includes a plurality of pixels, each pixel includes a filter region of red, blue and green, and each filter region includes a layer of filter material with different colors. And because the liquid crystal display panel is the color panel, the utility model discloses a projector 1 only need the single slice penetrating type liquid crystal display panel can, and need not to adopt the multi-disc (for example three) formula liquid crystal light valve framework. Alternatively, it can be understood that the optical path upstream of the projection lens 50 includes only a single transmissive liquid crystal panel 40. Therefore, no light combining component such as an X-type light combining sheet is required between the transmissive liquid crystal panel 40 and the projection lens 50. In this embodiment, the length of the diagonal line of the transmissive liquid crystal panel 40 is about 4 inches, and the transmissive liquid crystal panel 40 generally includes, for example, a polarizer 41, a glass substrate 42, a filter layer 43, a liquid crystal molecular layer 44, and a glass substrate 45 in sequence. The filter layer 43 includes a plurality of pixels, and each pixel includes a red filter 43A, a green filter 43B, and a blue filter 43C. In this example, each pixel group including three-color pixels is about 23 micrometers (μm) long and wide, and the larger the pixel group, the larger the particles of dust can be allowed to adhere to the surface without affecting the appearance of the projection.

The projection lens 50 is used for adjusting the light shape of the image beam and projecting the image beam onto an image plane. In this embodiment, the projection lens 50 includes a plurality of lenses having diopters respectively disposed at the front and rear ends of an Aperture Stop (Aperture Stop). In addition to the lens, the projection lens 50 may further include various optical elements, such as prisms, beam splitters, polarization elements, or light blocking and shielding elements, which can reflect and absorb part of the light or allow at least part of the light to pass through. The optical components and the lens can be arranged in a Barrel (Barrel) group. The lens barrel group may include only a single lens barrel, and focusing may be performed by moving the entire lens barrel back and forth along the optical axis, or may include a plurality of lens barrels, and each lens may be driven to focus by relative movement between the lens barrels. In this example, the lens barrel group includes only a single lens barrel.

In this example, the screen 60 is an alternative and is used to filter air. In this example, the sieve 60 was a sieve 60 of grade C4 under the american ASHRAE standard, and the specific gravity method trapping rate was more than 85%. In another example, the screen 60 is proposed to use a screen with a pycnometry trapping rate greater than 60%, 75% and 90%, for better, better and optimal filtration. The formula for calculating the specific gravity method trapping rate is as follows:

η＝((Wf–Wp)/Wf))╳100％。

η, Wf, and Wp, respectively, represent the air dust content on the air inlet side and the air dust content on the air outlet side of the tested filter, in another example, a higher grade filter can be used, and the filtering particle size of the filter 60 can be adjusted according to the value of the size of the dust particles that can be attached to the pixel surface by the transmissive liquid crystal panel 40, preferably, the filter 60 has a better, and better ability to prevent the quality of the image projection screen when the filtering particle size of the filter 60 is one third of the length of the shorter side of the pixel is more than 70%, 80%, and 90%, taking the transmissive liquid crystal panel 40 as an example in this example, the length of the pixel is 23 micrometers (mum), the filter 60 has a better, and better effect when the filtering particle size of about 8 micrometers is more than 70%, 80%, and 90%.

In this embodiment, when the projector 1 is applied, at least parts of the fan 20, the light source 30, the transmissive liquid crystal panel 40, the projection lens 50 and the filter 60 are fixed inside the housing 10. In this embodiment, the transmissive liquid crystal panel 40, the fan 20 and the openings formed in the through hole group 10a1 are sequentially arranged from top to bottom, and the entire transmissive liquid crystal panel 40 is disposed substantially above the fan 20, as shown in fig. 1B, that is, the transmissive liquid crystal panel 40 is not limited to be disposed directly above the fan 20.

And the transmissive liquid crystal panel 40 is disposed between the wind guide members 11 of the top surface 10B and the bottom surface 10A. The light-emitting surface of the transmissive liquid crystal panel 40 is substantially perpendicular to the extending direction of the support 14, i.e., the normal direction of the light-emitting surface of the transmissive liquid crystal panel 40 and the extending direction D1 of the support 14 are perpendicular to each other. In the application context of this embodiment, the normal direction D4 of the light-emitting surface of the transmissive liquid crystal panel 40 is substantially perpendicular to the gravity direction G. The transmissive liquid crystal panel 40 is disposed downstream of the light source 30 in the optical path; the projection lens 50 is disposed downstream of the transmissive liquid crystal panel 40 in the optical path. That is, the illumination beam emitted from the light source 30 is converted into an image beam by the transmissive liquid crystal panel 40 and then output to the projector 1 through the projection lens 50 to allow the image to be formed on the image plane. And a projection screen can be arranged at the image plane. In addition, when the projector is in operation, in order to maintain the internal temperature of the projector 1, the fan 20 disposed in the perforation group 10a1 may be used as an air inlet through the perforation group 10a1 to draw air from the outside of the projector 1 through the filter 60 in the direction opposite to the gravity G. The air is blown by the fan 20 in the longitudinal direction Y of the projector 1, and flows upward, i.e., in the direction opposite to the gravity G or in the direction Dout, toward the transmissive liquid crystal panel 40 through the air guiding surface 11A of the air guiding structure 11. The airflow at the transmissive liquid crystal panel 40 is substantially opposite to the extending direction D1 of the support 14, and in the present embodiment, the airflow direction D3 of the airflow at the transmissive liquid crystal panel 40 is substantially opposite to the gravity direction G, i.e. the airflow flows from bottom to top.

The air will be exhausted through the through hole set 10B1 on the top surface 10B of the projector 1 as the air outlet, and when the through hole set 10B1 is located at a region other than the region directly above the transmissive liquid crystal panel 40, it prevents dust from adhering to the surface of the transmissive liquid crystal panel 40, that is, the minimum straight distance L MIN between the air outlet and the light incident surface and the light emergent surface of the transmissive liquid crystal panel 40 along any direction perpendicular to the gravity direction is greater than or equal to one centimeter, or the minimum straight distance L MIN between the air outlet and the top surface of the transmissive liquid crystal panel 40 measured on the top surface is greater than or equal to one centimeter, that is, the minimum straight distance L MIN between the air outlet and the position vertically above the transmissive liquid crystal panel 40 is greater than one centimeter in the vertical direction of the transmissive liquid crystal panel 40 perpendicular to the bottom surface 10a 2.

In another embodiment, the air outlet may be selectively disposed on any one of the four side surfaces 10C. In addition, the air outlet is not limited to one, and the air outlet may be respectively disposed on any one of the top surface 10B, the bottom surface 10A and the four side surfaces 10C of the casing 10 of the projector 1 or on the above surfaces simultaneously as required, and the above surfaces may be disposed with more than one air outlet simultaneously. In this embodiment, the range of the flow channel of the air in the projector 1 is shown by referring to the flow direction W, and the flow channel is communicated with the external space of the projector 1.

With the above design, since the wind inlet direction at the wind inlet end E1 of the fan 20 is opposite to the gravity direction G, when the wind speed of the fan 20 cannot overcome the gravity of the dust itself, the amount of the dust that can move in the direction opposite to the gravity direction G and reach the filter 60 is greatly reduced. Accordingly, the life of the filter 60 can be prolonged. On the other hand, the wind guiding structure 11 causes the wind to flow through the transmissive liquid crystal panel 40 in the direction opposite to the gravity direction G, so that the amount of dust attached to the surface of the transmissive liquid crystal panel 40 can be further reduced by the above principle. It should be noted that, in this embodiment, the fan 20 is disposed at the position close to the perforation group 10a1 of the casing 10 to directly draw in air from the outside through the perforation group 10a1, but the position of the fan is not limited thereto, and the fan may be disposed at any position of the perforation group 10a2 of the casing 10 or in the flow channel, which is not limited by the present invention. Similarly, when the axial flow fan is used in the fan 20 of the present invention, the perforated set 10a1 can be disposed under the transparent liquid crystal panel 40, and the axial flow fan can draw air in the direction opposite to the gravity direction G and blow the air to the transparent liquid crystal panel 40 in the same direction, in this design, the flow guiding structure 11 can be omitted.

Referring to fig. 1B and fig. 2, fig. 1B illustrates a case where the fan 20 enters the wind in a direction opposite to the gravity direction G, and fig. 2 illustrates a case where the fan 20 enters the wind in a direction perpendicular to the gravity direction G. Fig. 1B shows an air inlet direction Din and an air outlet direction Dout through the air guiding structure 11, which are opposite to the gravity direction G. In fig. 2, the air inlet direction Din and the air outlet direction Dout passing through the air guiding structure 11 are perpendicular to the gravity direction G, respectively. That is, the wind direction of fig. 2 is perpendicular to the direction of gravity G, as opposed to the direction of gravity G of fig. 1B.

In one simulation, assume that a space of about 4 cm outside the inlet end E1 of the fan 20 of FIGS. 1B and 1C is uniformly set at 1000 particles of 69 microns per second with a density of 0.8g/cm³And 1.6g/cm³For ten seconds; the sectional area of the outlet of the fan 20 is substantially the same as the sectional area of the outlet end E3 (or referred to as the outlet end) of the air guide surface 11A of the air guide structure 11, and the average flow velocity through the outlet end E3 of the air guide surface 11A of the air guide structure 11 is 4.6 m/s. Under the condition of the simulation, no particle is output from the air outlet end E3. If the particle diameter is adjusted to 23 μm and the density is maintained at 0.8g/cm³And 1.6g/cm³Under the other conditions, the passing rates were 0.62% and 0.01%. The design of FIG. 2 was simulated with the same parameters, when the particle size was 69 microns and the density was 0.8g/cm³And 1.6g/cm³In the case of this, the passing rates were 7.62% and 5.27%. When the particle diameter was 23 μm, the passing rates were 16.55% and 8.93%. The lower the average flow velocity of the air outlet E3 of the air guiding surface 11A of the air guiding structure 11 is, the smaller the number of particles entering the casing 10 and adhering to the transmissive liquid crystal panel 40 is. The parameters are arranged as follows:

table one shows the particle passage rate for each design at a particle size of 69 μm.

Table one.

Table two shows the particle passage rate for each design when the particle size is 23 μm.

And (7) a second table.

Therefore, the utility model discloses a design with the direction of gravity G into the wind opposite can effectively reduce the particle quantity that gets into projector 1.

Referring to fig. 3A and 3B, fig. 3A and 3B respectively illustrate a perspective view of a second embodiment of the present invention and a schematic view taken along a-a section of fig. 3A. In contrast to the diversion structure 11 of the first embodiment, in this example, a wind shielding structure 13 is provided. The wind shielding structure 13 extends from the inner side of the bottom surface 10A to the direction opposite to the gravity G, i.e., along the thickness direction Z of the projector 1, and further extends at the top along the length direction Y to form a C-shaped cross section. The wind shielding structure 13 extends in the width direction X and is selectively as wide as the fan 20, the wind shielding structure 13 can receive part of the wind from the fan 20 and generate a vortex, and the dust collides with the wind shielding structure 13 in the vortex and falls down, and falls out of the housing through another opening 10A2 arranged below the wind shielding structure 13 and on the bottom surface 10A, thereby achieving the effect of dust prevention. In this example, the wind shielding structure 13 is integrally FORMED (ONE PIECE FORMED) with the cabinet 10 and is a part of the cabinet 10. However, in another embodiment, the wind shielding structure 13 may be a separate component disposed on the bottom surface 10A of the casing 10.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make many modifications or equivalent variations by using the above disclosed method and technical contents without departing from the technical scope of the present invention, but all the simple modifications, equivalent variations and modifications made by the technical spirit of the present invention to the above embodiments are within the scope of the technical solution of the present invention.

Claims

1. A projector, comprising:

a housing having a bottom surface:

a support member disposed on the bottom surface and extending outwardly from the bottom surface;

the light source is arranged in the shell;

a penetrating liquid crystal panel arranged at the downstream of the light path of the light source and positioned in a flow channel communicated with the outside air;

the projection lens is arranged in the shell and is arranged on the downstream of the light path of the transmissive liquid crystal panel; and

the fan is arranged in the shell, is positioned in the flow channel and is used for generating air flow;

the upstream of the optical path of the projection lens only comprises a transmissive liquid crystal panel; and the air flow is opposite to the extending direction of the supporting piece at the position of the penetration type liquid crystal panel.

2. A projector, comprising:

a light source;

a transmissive liquid crystal panel including multicolor filtering disposed at the downstream of the light source light path;

the projection lens is arranged at the downstream of the light path of the transmissive liquid crystal panel;

a casing having a space for accommodating the light source and the transmissive liquid crystal panel and an opening on a bottom surface of the casing, the opening communicating with the inside and the outside of the casing; and

the fan is provided with an air inlet end at the opening and is a centrifugal fan;

the transmissive liquid crystal panel, the fan and the opening are arranged in sequence from top to bottom.

3. The projector as defined in claim 2 wherein the projector further comprises:

a support member disposed on the bottom surface of the housing and extending outwardly from the bottom surface.

4. The projector as claimed in claim 1 or 3, wherein the light-emitting surface of the transmissive liquid crystal panel is perpendicular to the extending direction of the supporting member.

5. The projector as claimed in claim 4, wherein the fan is a centrifugal fan, and the wind output from the fan is guided to the transmissive liquid crystal panel via a wind guide surface provided in the housing in a direction opposite to the extending direction of the supporting member.

6. The projector as claimed in claim 5, wherein the direction of the air flow at the transmissive liquid crystal panel and the direction of the air entering the fan are opposite to the extending direction of the supporting member.

7. The projector as claimed in claim 6, wherein the direction of the transmissive liquid crystal panel is perpendicular to the bottom surface, and the housing has an outlet, and a minimum linear distance between the outlet and a position vertically above the transmissive liquid crystal panel is greater than one centimeter.

8. The projector as defined in claim 7 wherein the fan is fixed to the bottom surface and the outlet is disposed on a top surface of the cabinet.

9. The projector as claimed in claim 7, wherein the average flow velocity at the outlet end of the air guide surface is 4.6m/s or less.

10. The projector of claim 9 wherein the projector further comprises a screen disposed at the air inlet end of the fan.