CN211506155U - Projector optical system and projector optical engine - Google Patents
Projector optical system and projector optical engine Download PDFInfo
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- CN211506155U CN211506155U CN202020660270.6U CN202020660270U CN211506155U CN 211506155 U CN211506155 U CN 211506155U CN 202020660270 U CN202020660270 U CN 202020660270U CN 211506155 U CN211506155 U CN 211506155U
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Abstract
The utility model discloses an optical system of a projector, which comprises an LED light source, a light bar deflection module, an overlapping lens module, a first reflector, a focusing lens, an LCD light valve, a field lens, a second reflector and a projection lens which are arranged in sequence according to the advancing direction of light; wherein the optical wand deflects the module and carries out integral and polarized light to the natural light of LED light source outgoing and change, overlaps the lens module and superposes the light through the integral on the LCD light valve for projector light utilization ratio realizes significantly promoting by a wide margin, and the apparent ground saves the power consumption, and realizes the even illumination to the LCD light valve, is showing to improve the illumination degree of consistency and the low not enough of lighting efficiency, simultaneously the utility model also discloses a projector optical engine, include projector optical system.
Description
Technical Field
The utility model relates to a projector field especially relates to a projector optical system and projector optical engine.
Background
In recent years, numerous domestic enterprises and brands continuously try to innovate projection products and markets, and obtain remarkable results, so that a brand-new wide market, namely a fast-moving digital market, is developed for projectors. The remarkable characteristics of the innovative products completely different from the traditional functional projector are as follows: the performance such as brightness, image quality and the like is basically applicable, the appearance is exquisite and fashionable, the power consumption and the noise are extremely low, the battery is arranged in the device, the endurance time is long, and the device is commonly called as 'tide' projection in the industry. These tidal projections are based on DLP technology with solid state light sources, wherein DMD is provided exclusively by texas instruments and solid state light sources are essentially provided exclusively by europe, these materials involved in the core of the technology, and the native enterprise is fundamentally devoid of intellectual property rights.
The single LCD projector is completely different, the whole industry chain can be independently dominant locally, particularly, the cost performance competitiveness is very obvious, for example, the cost of the 720P and 150Lm single LCD projector is lower than 1/5 of DLP tide products with the same index, and simultaneously, the image effect, particularly the contrast and the focusing definition of the single LCD projector reach or even exceed the performance of the DLP tide products, so the single LCD projector is one of the upgrading exit options which are more than the national tide product projection.
The biggest restriction of the single LCD projection technology is that when the brightness index of the DLP products is reached, the power consumption and the noise are relatively too large and too large; the photoelectric efficiency (η, i.e. the luminance of the projector output divided by the input electrical power of the light source) is too low, and there is no possibility of reasonable implementation for the battery-equipped "just-needed" and in terms of endurance; in addition, the uniformity of brightness of a single LCD projector is also far from the uniformity of the above-mentioned damp projection.
The eta of the single LCD projector in the prior art is generally about 0.8-4Lm/w, but the eta of DLP tide is as high as 10-17Lm/w, so that the single LCD projector with high consumption and low efficiency is expected to become a tide family, the photoelectric efficiency must be improved, the eta is close to or basically reaches the technical level of the DLP tide, and an optical integration device must be arranged to realize the uniform illumination of the LCD light valve.
So need to carry out comprehensive, thorough innovation to the current simple inefficient lighting technology of single LCD projector in order to narrow and wipe off with DLP tide's photoelectric efficiency gap, it is exactly the problem that the utility model discloses solve.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an it is not enough with regard to overcoming prior art, provide a projector optical system, effectively promoted the photoelectric efficiency of single LCD projector and the homogeneity of LCD light valve illumination.
In order to achieve the above object, the utility model provides a projector optical system, include LED light source, optical wand deflection module, integral lens module, first speculum, focusing lens, LCD light valve, field lens, second mirror and the projecting lens that sets gradually according to light advancing direction.
The optical rod deflection module comprises an integrating rod, a polarization modulation plate and a brightening type polarizing plate which are sequentially attached and arranged according to the advancing direction of light.
The incidence surface of the integrating rod is provided with a light transmission part for allowing light to transmit and a reflection part for reflecting the light.
The size and the area of the light transmission part are larger than or equal to those of the light emitting surface of the LED light source.
The light-transmitting portion is opposed to a light-emitting surface of the LED light source.
Furthermore, the integrating rod is made of glass, or is a hollow light tunnel with four plane inner walls having a light reflecting function, or a hollow light pipe with a curved inner wall having a light reflecting function.
Optionally, the length, width and area of the entrance surface of the integrating rod are less than or equal to the length, width and area of the exit surface of the integrating rod.
Optionally, the etendue of the incident surface of the integrating rod under the irradiation of the light from the LED light source is less than or equal to the etendue of the LCD light valve under the constraint of the projection lens.
Preferably, the aspect ratio of the exit face of the integrating rod and the aspect ratio of the LCD light valve display window are equal, but not limited to absolutely equal.
Preferably, the length and width dimensions of the incident surface and the exit surface of the glass rod are equal.
Further, the polarization modulation panel employs a phase plate or a wide wavelength depolarizer.
Or the polarization modulation plate adopts one or the combination of any more of a passive optical rotator which does not change the polarization state of the incident polarized light, a passive retarder which can change the polarization state of the incident polarized light or an active optical rotator.
Or the polarization modulation plate adopts a scattering sheet or a diffusion sheet.
Preferably, the phase plate is a random phase plate.
Preferably, the depolarizer is made into a hexahedron, and the size of the light-passing section of the depolarizer is equal to that of the light-passing section of the glass rod; after the incident surface of the depolarizer is attached to the emergent surface of the glass rod, the depolarizer is optically equivalent to a part of the glass rod, so that the efficiency and the integral effect of the light rod deflection module are improved.
Further, the passive retarder adopts any one of a quarter-wave plate or an eighth-wave plate or a combination of any several of the quarter-wave plate and the eighth-wave plate.
Furthermore, the brightness enhancement type polarizing plate adopts a wire grid type polarizer with a brightness enhancement function or a reflective polarizer with a brightness enhancement function.
Furthermore, the overlapped lens module comprises more than two lenses which are sequentially arranged according to the light advancing direction.
Further, the overlay lens module includes an outer cylinder for fixing the lens.
Furthermore, the number of the lenses of the overlapped lens module is three, and the three lenses are respectively a first lens, a second lens and a third lens which are sequentially arranged according to the light advancing direction.
Further, the substrate of the LED light source is attached to the outer cylinder.
Furthermore, a light-transmitting part and a reflecting part on the incidence surface of the integrating rod are manufactured on a light-transmitting and reflecting flat plate; the reflecting part of the transflective flat plate is attached to the integrating rod.
Optionally, the transparent and reflective flat plate is a mirror aluminum plate, and the light-transmitting portion on the transparent and reflective flat plate is a through hole formed in the mirror aluminum plate.
The utility model also provides a projector optical engine, which comprises a radiator, a fan, a dustproof device, an optical engine box and the projector optical system; the projector optical system, the fan and the dustproof device are arranged on the optical engine box; an air draft channel is formed between the focusing lens and the LCD light valve and between the LCD light valve and the field lens, and the dustproof device and the fan are respectively positioned at an air inlet and an air outlet of the air draft channel; the radiator is used for radiating the LED light source, and the fan is aligned to the fins of the radiator; the optical engine box is sealed at the rest parts except the dust-proof device and the fan.
The utility model also provides a projection method of projector optical system, including following step:
after the light emitted by the LED light source is integrated and converted by the light bar deflection module, the integrated light is reflected by the first reflector and focused by the focusing lens through the overlapping lens module and then is superposed on the LCD light valve, and the light emitted by the LCD light valve is projected out of the projection lens after sequentially passing through the field lens and the second reflector.
Further, the light bar deflection module increases the total increase η of the projector light utilization efficiencyincComprises the following steps:
ηinc＝ΔΨR+ΔΨL；
wherein:
wherein:
ΔΨRan increment for improving the light utilization efficiency of the projector corresponding to the reflection part; Δ ΨLFor the LED light source to correspondIncreasing the light utilization efficiency of projector, β the modulation efficiency of polarized light modulation board, TLIs the transmission of the integrating rod; t isP、RPThe transmittance and reflectance of the brightness enhancement type polarizing plate, respectively; a. theSThe area of the light transmission part; a. theLIs the area of the incidence surface of the integrating rod; rMIs the surface reflectance of the reflective portion; l isRThe LED light source includes a light emitting surface and a substrate that cooperate to provide reflectivity.
The utility model has the advantages that:
1. the utility model discloses a light bar commentaries on classics offset module carries out integral and polarized light to the natural light of LED light source outgoing and changes, superposes the light through the integral on the LCD light valve through overlapping lens module for projector light utilization ratio realizes promoting by a wide margin, practices thrift the power consumption, and realizes evenly throwing light on to the LCD light valve.
2. The utility model discloses use the integrating rod, the integrating rod can carry out the shape to the display window of the luminous surface overall dimension of LED light source and LCD light valve easily and match, so can improve the utilization ratio of LED light source well.
3. Will the utility model discloses the printing opacity portion and the reflection part of integrator rod incident surface make on independent transparent reflection flat board, can reduce the preparation degree of difficulty of integrator rod, and transparent reflection flat board is convenient to be matchd with the integrator rod.
4. The utility model discloses an urceolus makes up into an accurate illumination assembly module with LED light source, optical wand deflection module and overlapping lens module, is favorable to improving production processes, improves production efficiency.
5. The utility model discloses after the improvement of lighting efficiency comprehensiveness, essence, make single LCD projector possess to equip the battery and keep the required reasonable photoelectric efficiency condition of long duration innovatively, have fabulous novelty, price/performance ratio and practicality, make single LCD projector consume slowly high-efficient, had the projected possibility that becomes high-quality tide article, touch the market of more widely.
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 these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical system according to the present invention;
FIG. 2 is a schematic view of the deflection principle of the present invention;
FIG. 3 is a partial schematic view of the LED light source of FIG. 1;
FIG. 4 is a cross-sectional perspective view of the LED light source, light bar deflection module and overlapping lens module of FIG. 1 assembled in accordance therewith;
FIG. 5 is an exploded view of FIG. 4;
fig. 6 is a schematic structural diagram of the optical engine of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.
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 should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, and are used for convenience of description and simplification of description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. 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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In particular, in the present invention, since the distance between the light emitting surface 101 of the LED light source 1 and the incident surface of the integrator rod 21 is very short (the smaller this distance is, the higher the system efficiency is), it can be considered that the light emitting surface 101 of the LED light source 1 and the incident surface of the integrator rod 21 are on the same plane (the same applies hereinafter) at the time of optical design and analysis; in the optical design and analysis, the thickness of the polarization modulation plate 22 and the side surface of the polarization modulation plate 22 are specifically determined whether or not the emission surface of the integrator rod 21 optically constitutes a part of the equivalent side reflection surface of the integrator rod 21, and for the convenience of analysis, the emission surface of the integrator rod 21 described below is not strictly distinguished as the physical emission surface of the integrator rod 21 itself or the emission surface including the equivalent "integrator rod" after the polarization modulation plate 22 has taken part in the optical integration.
Example one
As shown in fig. 1 to 3, the optical system of the projector according to the present embodiment includes an LED light source 1, a light bar deflection module 2, a superimposing lens module 3, a first reflecting mirror 4, a focusing lens 5, an LCD light valve 6, a field lens 7, a second reflecting mirror 8, and a projection lens 9, which are sequentially arranged in a light traveling direction.
In this embodiment, light (natural light) emitted from the light emitting surface 101 of the LED light source 1 enters the light rod deflection module 2 through the light transmitting portion 2101 of the integrator rod 21, is integrated and deflected, and then enters the overlapping lens module 3, and superimposes a plurality of light source images on the exit surface of the integrator rod 21 on the LCD light valve 6, so as to realize uniform illumination of the LCD light valve 6; the focusing lens 5 makes the illuminating light of the LCD light valve 6 aim at the entrance pupil of the projection lens 9, thereby further realizing high-efficiency light transmission.
As shown in fig. 1, the overlay lens module 3 includes a first lens 31, a second lens 32, and a third lens 33, which are sequentially disposed. The conjugate relation is as follows: the light emitting surface 101 of the LED light source 1 and the second lens 32 are conjugated; the second lens 32 and the entrance pupil of the projection lens 9 are conjugated; the exit face of the integrating rod 21 is conjugated with the LCD light valve 6; the LCD light valve 6 is conjugated to a projection screen (not shown).
Further, as shown in fig. 1, an LED light source 1 and a light rod deflection module 2 are provided in this order in the light traveling direction, and the light rod deflection module 2 is composed of an integrator rod 21, a polarization modulation plate 22, and a brightness enhancement type polarizing plate 23 which are laminated in this order.
The integrating rod 21 in this embodiment is a solid glass rod made of glass, and the size of the emergent surface is equal to that of the incident surface; the polarization modulation plate 22 adopts a wide-wavelength depolarizer; the brightness enhancement type polarizing plate 23 adopts a wire grid type polarizer; the size of the light-passing cross section of the depolarizer is equal to that of the glass rod, and the total reflection effect of the four side surfaces of the depolarizer on optics equivalently lengthens the length of the integrating rod 21; the gap between the light emitting surface 101 of the LED light source 1 and the entrance face of the integrator rod 21 is about 0.05 to 0.12 mm.
As shown in fig. 2, two light beams Wa and Wb are emitted from any point W on the light emitting surface 101 of the LED light source 1, enter through the light transmitting portion 2101 of the integrator rod 21, pass through the polarization modulation plate 22, and reach points c and d on the brightness enhancement polarizing plate 23.
Further, the light Wa is separated into desired light L by the brightness enhancement polarizing plate 2301Transmission, the other ray S01Is reflected, the light ray L01And S01Linearly polarized light with equal amplitude and orthogonal vibration; the light ray S01After being reflected back and passing through the polarization modulation plate 22, the polarization degree is degraded, and the light enters from the exit surface of the integrating rod 21 and reaches the W on the reflection portion 2102 on the entrance surface of the integrating rod 211Point-generated reflection, reflected light W1n are again incident on the integrating rod 21 and pass through the polarization modulation plate 22 again, whereupon the degree of polarization is further degraded and approaches natural light; the brightness enhancement polarizer 23 performs polarization separation again, so that the light corresponding to the transmission axis is transmitted, while the light not corresponding to the transmission axis is reflected, and the processes of re-polarization, re-reflection, re-polarization separation, and the like are repeated.
At the same time, at the point d on the brightness-enhancing polarizing plate 23, the light Wb is also subjected to polarization separation to give a light L02Is transmitted through, S02The reflected light beams L02 and S02 are linearly polarized light with equal amplitude and orthogonal vibration, and the light beam L02And the aforementioned light L01Have the same direction of polarization plane.
The light ray S02After passing through the polarization modulation plate 22, the polarization degree is degraded, and the degraded polarization degree enters the integrating rod 21, passes through the light-transmitting part 2101 on the incident surface of the integrating rod 21, and reaches the W on the light-emitting surface 101 of the LED light source 12Point on W and2the reflection and refraction occur at the point, and a part of the light ray W2e is reflected into the integrating rod 21; a part of the light ray W2W3Is refracted to continue to advance to reach W on the substrate 102 of the LED light source 13Point-by-point reflection by the substrate 102 of the LED light source 1, reflecting light W3m enter the integrating rod 21; in the light ray W2e and W3m enter the integrating rod 21, the above-described Wa and Wb process is similarly repeated.
It should be noted that, as shown in fig. 3, the natural light T emitted from the LED light source 1 is polarized and separated by the light bar polarization module 2 and reflected back to a portion of linearly polarized light S, and the reflectivity of the light emitting surface 101 of the LED light source 1 is usually 3-4%; although the reflectivity of the substrate 102 of the LED light source 1 is generally greater than 90%, the area of the substrate 102 that can actually reflect depends on the arrangement of the LED chips 103 because of the LED chips 103 (the area and thickness of the LED chips 103 affect the reflection effect of the substrate 102) and the blocking of the phosphor and the silica gel 104. Nevertheless, the light emitting surface 101 and the substrate 102 of the LED light source 1 still contribute to the deflection of the present embodiment, which is not negligible, because the light blocking capability of the phosphor and the silica gel 104, the effective reflection capability of the gap between the LED chips 103, the re-excitation of the phosphor in the phosphor and the silica gel 104 by the short-wave component in the light S, and the total efficiency after the total reflection loss of the light from the dense matter to the sparse matter on the light emitting surface 101 are considered, which are all significant.
Those passing through W on the light emitting surface 101 of the LED light source 12The light not reflected back to the integrator rod 21 is absorbed by the LED chip 103 of the LED light source 1, the phosphor and silica gel 104, and the substrate 102, and converted into joule heat.
Example two
As shown in fig. 1-3, the integrating rod 21 of the present embodiment is a solid glass rod made of glass, and the incident surface and the exit surface of the glass rod have equal size; the polarization modulation panel 22 is a phase plate; the brightness enhancement polarizer 23 is a wire grid polarizer. And a necessary air gap is reserved between the emergent surface of the phase plate and the incident surface of the wire grid type polarizer.
In this embodiment, the process of the light emitted from the LED light source 1 reaching the wire grid polarizer is not described in detail.
Referring to the first embodiment, the light ray S01The light S is reflected by the brightness enhancement type polarizing plate 23 and passes through the polarization modulation plate 2201Is randomly changed in phase and is injected into the integrator rod 21, and further onW on the reflecting portion 21021Point reflection, and then re-entering the integrator rod 21 and passing through the polarization modulation plate 22 again, the light ray S01Is further randomly changed in phase and is further irradiated to the brightness enhancement type polarizing plate 23, so that the brightness enhancement type polarizing plate 23 emits the light S from the light S01The light rays passing through the axis are separated out, and the rest light rays are reflected back again.
With further reference to the first embodiment, the light ray S02The process of passing through the light-transmitting part 2101 to the LED light source 1 is not described in detail.
Each time the light beam that passes through the polarization modulation plate 22 and enters the brightness enhancement type polarizer 23 and each time the light beam that is reflected from the brightness enhancement type polarizer 23 and returns to the polarization modulation plate 22 cannot return along the original path (except for the light beam on the central axis), that is, a certain light beam cannot occur at the same point when entering and exiting the phase plate, so the phase plate does not need to be used for simple one-time transmission, and mechanical movement is needed to realize more efficient phase change, which lays the foundation for efficient and simple polarization.
Setting: the total light ray emitted out of the light bar deflection module 2 is Lpo＝L01+L02+L03+，，，+LnIn the present embodiment, the amount of increase in the light use efficiency due to the deflection is calculated by the following formula:
ηinc＝ΔΨR+ΔΨL
in the formula:
in the formula:
ΔΨRthe area where the reflecting part 2102 is located corresponds to the increment which improves the light utilization efficiency of the projector;
ΔΨLthe LED light source 1 may be understood as an increment for improving the light utilization efficiency of the projector, or an increment for improving the light utilization efficiency of the projector in correspondence to the area where the light transmission portion 2101 is located;
β is the modulation efficiency of the polarization modulation panel 22, expressed as a percentage of energy;
TLis the transmittance of integrating rod 21;
TP、RPthe transmittance and reflectance of the brightness enhancement type polarizing plate 23;
ASis the area of the light-transmitting part 2101, ALIs the area of the entrance face of integrating rod 21;
RMis the surface reflectance of the reflective portion 2102;
LRis the reflectivity of the LED light source 1 comprising the light emitting surface 101 and the substrate 102 in cooperation.
The effect of this embodiment will now be described with reference to specific data:
in the existing single LCD projector, between the LED light source and the front mirror, either a lens is used as a condenser or a square cone condenser (one of V-shaped light funnels) is used to condense light, and the optical system sequentially comprises: the system comprises an LED light source, a condenser, a front field lens, an LCD light valve, a rear field lens and a projection lens.
Generally, the efficiency of the light emitted from the LED light source reaching the polarizer on the incident side of the LCD light valve is not more than 63%, the transmittance of the LCD light valve is 6%, the field lens efficiency is 92%, and the projection lens efficiency is 98%, so the total efficiency of the optical system of the conventional single LCD projector is about 3.4%, the luminous flux of the LED light source is 4000Lm, and the power is 35W.
The projector output brightness is 136Lm, and η is 136(Lm)/35(W) is 3.9 Lrn/W.
In this embodiment, the luminous flux of the LED light source 1 is 4000Lm, the power is 35W, the total efficiency of the overlay lens module 3, the first reflector 4 and the focusing lens 5 is 94%, the transmittance of the LCD light valve 6 is 6%, and the total efficiency of the field lens 7, the second reflector 8 and the projection lens 9 is 89.2%; the optical expansion of the entrance and exit surfaces of the integrating rod 21 is less than or equal to the optical expansion of the LCD light valve 6 under the restriction of the projection lens 9.
Further, in this embodiment, without providing the polarization modulation plate 22 and the brightness enhancement type polarizing plate 23, the light flux (natural light) of Lnat > 3700Lm can be obtained on the exit surface of the integrator rod 21, and the optical system of the present invention can output 186Lm, η ═ 5.3Lm/w, and η is significantly improved by about 1.36 times compared with the prior art.
Further, when the polarization modulation plate 22 and the brightness enhancement polarizing plate 23 are provided, the light exit surface of the brightness enhancement polarizing plate 23 has about Lpo2680-3100Lm output (linearly polarized light), said LpoThe transmittance of the LCD light valve 6 is 6%/42%/14.3% after stripping the incident polarizer, so that the projector outputs 342Lm-393Lm, η up to 9.8Lm/w-11.2Lm/w, which has substantially reached the DLP quality level.
The existing tide projector generally uses a common 18650 battery (the capacity is about 3.7V/2600 mAH) to pursue cost performance, and the equipment quantity is about 5 knots. The 5-unit 18650 battery keeps the duration (more than or equal to 2 hours) and the discharge threshold of watching a movie, the power of the projector is not more than 18W, the power of the light source is limited within 15W (the smaller the duration is longer), the brightness is more than or equal to 100 lumens, and the projector has the applicability of projecting a large screen of more than 60 inches in a good shading environment. By using the optical system of the embodiment, the LED light source 1 can output about 100-110ANSILm under the power of about 9-10W, and can output about 150ANSILm under the power of 15W, and the color, contrast and focusing image quality level of the middle-low end DLP tide project are completely exceeded, so as to reach the brightness and uniformity level, and substantially reach the η level, and the cost is less than one third, and no supply chain bottleneck exists, thus having very good utility model innovation value.
EXAMPLE III
This embodiment requires a precise assembly to produce a good optical efficiency, especially the assembly precision of the LED light source 1, the light bar deflection module 2 and the overlapped lens module 3, as shown in fig. 4-6.
As shown in fig. 4-5, the overlay lens module 3 includes a first lens 31, a second lens 32, and a third lens 33 mounted on a precision outer barrel 34; the LED light source 1, the light bar deflection module 2 and the overlapped lens module 3 are combined into a precise lighting assembly module, so that more flexible flow arrangement can be realized during production. The optical material is mounted on the optical engine box 13 after achieving better coaxiality and precision, so that the structural precision requirement of the optical engine box 13 can be lowered, and the cost is lowered.
Further, fig. 5 is an exploded view of the LED light source 1, the light rod deflection module 2 and the overlapped lens module 3 assembled into a lighting assembly module. When the glass rod is selected, because the four total reflection surfaces of the glass rod cannot contact other materials, the incident surface of the transflective flat plate needs to be attached to the substrate 102 of the LED light source 1, the reflection part on the exit surface of the transflective flat plate needs to be attached to the integrating rod 21, and then the integrating rod 21 is assembled with the outer cylinder 34; alternatively, the exit surface of the optical rod turning/deflecting module 2, that is, the exit surface of the brightness enhancement type polarizing plate 23 is bonded to the entrance surface of the first lens 31, and then assembled into the outer tube 34 through the first lens 31.
Example four
As shown in fig. 6, the optical engine 100 of the projector provided in this embodiment includes a heat sink 10, a fan 11, a dust-proof device 12, an optical engine box 13, and the optical systems of the projectors described in the first to third embodiments; the projector optical system, the fan 11 and the dustproof device 12 are arranged on the optical engine box 13; an air draft channel is formed between the focusing lens 5 and the LCD light valve 6 and between the LCD light valve 6 and the field lens 7, and the dustproof device 12 and the fan 11 are respectively positioned at an air inlet and an air outlet of the air draft channel; the heat sink 10 is used for dissipating heat of the LED light source 1, and the fan 11 is aligned with fins of the heat sink 10; the optical engine box 13 is sealed except that the dust-proof device 12 can supply air and the fan 11 can supply air.
In this embodiment, the LCD light valve 6 and the LED light source 1 are cooled simultaneously under the action of the fan 11 and the heat sink 10, and the dust-proof device 12 prevents dust from entering, so as to prolong the service life of the projector.
In this embodiment, the LCD light valve 6 and the LED light source 1 use the same fan 11, so that the power consumption of the projector is reduced, the overall structure is compact, and the overall dimension and the operating noise of the projector are reduced.
In this embodiment, the LED light source 1, the optical rod deflection module 2, and the overlapped lens module 3 are used as an optical component module, which can achieve better coaxiality and precision, and when being mounted on the optical engine box 13, can effectively reduce the structural precision requirement of the optical engine box 13, reduce the cost, and improve the production efficiency.
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 above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (11)
1. An optical system of a projector is characterized by comprising an LED light source (1), a light bar deflection module (2), an overlapping lens module (3), a first reflector (4), a focusing lens (5), an LCD light valve (6), a field lens (7), a second reflector (8) and a projection lens (9) which are sequentially arranged according to the light advancing direction;
the light bar deflection module (2) comprises an integrating bar (21), a polarization modulation plate (22) and a brightness enhancement type polarizing plate (23) which are sequentially attached and arranged according to the light advancing direction;
a light transmitting part (2101) allowing light to transmit and a reflecting part (2102) reflecting the light are arranged on the incident surface of the integrating rod (21);
the size and the area of the light-transmitting part (2101) are larger than or equal to those of the light-emitting surface (101) of the LED light source (1);
the light-transmitting part (2101) is opposite to the light-emitting surface (101) of the LED light source (1).
2. The projector optical system according to claim 1, wherein the integrating rod (21) is made of any one of a solid glass rod made of glass, a hollow light tunnel having four planar inner walls with a light reflecting function, or a hollow light guide tube having a curved inner wall with a light reflecting function.
3. The projector optical system according to claim 1, wherein the polarization modulation plate (22) employs a phase plate or a wide wavelength depolarizer;
or the polarization modulation plate (22) adopts any one or the combination of any several of a passive optical rotator which does not change the polarization state of the incident polarized light, a passive retarder which can change the polarization state of the incident polarized light and an active optical rotator;
alternatively, a diffusion sheet or a diffusion sheet is used as the polarization modulation plate (22).
4. The projector optical system as defined in claim 3 wherein the passive retarder is one of a quarter-wave plate or an eighth-wave plate or a combination of any of the quarter-wave plate and the eighth-wave plate.
5. The projector optical system as defined in claim 1 wherein the brightness enhancement polarizer (23) is a wire grid polarizer having a brightness enhancement function or a reflective polarizer having a brightness enhancement function.
6. The projector optical system as defined in claim 1 wherein the superimposed lens module (3) includes two or more lenses arranged in order in the direction of travel of the light.
7. The projector optical system as claimed in claim 6, wherein the overlapping lens module (3) comprises an outer cylinder (34) for fixing the lenses.
8. The projector optical system as defined in claim 6 wherein the number of the lenses is three, and the lenses are a first lens (31), a second lens (32), and a third lens (33) arranged in this order in the light traveling direction.
9. The projector optical system according to claim 7, wherein the substrate (102) of the LED light source (1) and the outer cylinder (34) are bonded.
10. The projector optical system according to claim 1, wherein the light-transmitting portion (2101) and the reflecting portion (2102) on the incident surface of the integrator rod (21) are formed on one transflective flat plate; the reflecting part (2102) of the transflective flat plate is attached to the integrating rod (21).
11. A projector optical engine comprising a heat sink (10), a fan (11), a dust-proof device (12), an optical engine box (13), and the projector optical system of any of claims 1-10; the projector optical system, the fan (11) and the dustproof device (12) are arranged on the optical engine box (13); an air draft channel is formed between the focusing lens (5) and the LCD light valve (6) and between the LCD light valve (6) and the field lens (7), and the dustproof device (12) and the fan (11) are respectively positioned at an air inlet and an air outlet of the air draft channel; the heat radiator (10) is used for radiating the heat of the LED light source (1), and the fan (11) is aligned to the fins of the heat radiator (10); the optical engine box (13) is in a sealed state at the rest parts except that the dustproof device (12) can supply air and the fan (11) can supply air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020660270.6U CN211506155U (en) | 2020-04-27 | 2020-04-27 | Projector optical system and projector optical engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020660270.6U CN211506155U (en) | 2020-04-27 | 2020-04-27 | Projector optical system and projector optical engine |
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| CN211506155U true CN211506155U (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115356886A (en) * | 2022-08-12 | 2022-11-18 | 长沙创荣电子科技有限公司 | Optical machine with secondary reflection structure and projector |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115356886A (en) * | 2022-08-12 | 2022-11-18 | 长沙创荣电子科技有限公司 | Optical machine with secondary reflection structure and projector |
| CN115356886B (en) * | 2022-08-12 | 2024-03-22 | 长沙创荣电子科技有限公司 | Light machine with secondary reflection structure and projector |
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