TW201907222A - Laser projector - Google Patents
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Abstract
Description
本發明係有關於一種雷射投影機，尤指一種偏振分光式雷射投影機。The invention relates to a laser projector, in particular to a polarization beam splitting laser projector.
雷射投影機是利用雷射二極體（Laser Diode）作為激發光源來使螢光粉發出黃、紅、綠或藍等不同波長的光，以作為投影機的光源使用。目前現有的雷射投影機大致上可分為反射式雷射投影機與偏振分光式雷射投影機兩大類，而不論是反射式雷射投影機或是偏振分光式雷射投影機大多藉由將雷射光束光源打在螢光粉色輪上，以使螢光粉色輪上的螢光粉受激發後產生螢光。然而，由於雷射光束的能量密度過高，故容易導致螢光粉色輪發生熱淬滅（thermal quenching）的現象，造成螢光粉色輪的激發效率隨著雷射功率的提高而快速地下降，甚至可能因雷射光束的能量過於集中而燒壞螢光粉色輪。The laser projector uses a laser diode (Laser Diode) as an excitation light source to make the phosphor powder emit light of different wavelengths such as yellow, red, green or blue, and is used as a light source of the projector. At present, the existing laser projectors can be roughly divided into two types: reflective laser projectors and polarization split laser projectors, and most of them are reflective laser projectors or polarization split laser projectors. The laser beam source is placed on the fluorescent pink wheel to cause the phosphor on the fluorescent pink wheel to be excited to produce fluorescence. However, since the energy density of the laser beam is too high, it is easy to cause thermal quenching of the fluorescent pink wheel, and the excitation efficiency of the fluorescent pink wheel rapidly decreases as the laser power increases. It is even possible to burn out the fluorescent pink wheel because the energy of the laser beam is too concentrated.
另一方面，在偏振分光式雷射投影機中，主要是利用偏振分光鏡（dichroic filter）進行合光。然而，由於偏振分光鏡對於S偏振光與P偏振光的波長容許範圍不大，故作為雷射投影機之光源的雷射二極體必須選用波長符合偏振分光鏡之光學特性的雷射二極體。請參考第1圖，第1圖用以說明偏振分光鏡的光學特性。其中，曲線110用以表示偏振分光鏡對於P偏振光的光學特性，曲線120用以表示偏振分光鏡對於S偏振光的光學特性，而曲線130用以表示雷射投影機中的雷射二極體其所發出的雷射光束的波長分佈。由曲線130可知，雷射光束的波長大約在460nm附近。當雷射光束為S偏振光時，因雷射光束對偏振分光鏡的穿透率幾乎等於0%，故偏振分光鏡會反射雷射光束。當雷射光束為P偏振光時，因雷射光束對偏振分光鏡的穿透率幾乎等於100%，故雷射光束可穿透偏振分光鏡。其中，曲線110與120之間的波長差距稱為偏振分光鏡的譜間隙（spectral gap），而當譜間隙不夠寬時，於製造雷射投影機過程中會限制做為雷射光源的雷射二極體的選擇性。再者，由於雷射二極體之間有著約±5nm的波長公差，故倘若雷射投影機光源中的某些雷射二極體的波長偏差較大的話，將會導致投影機的合光效率變差，進而影響投影機的亮度。On the other hand, in a polarization beam splitting type laser projector, light combining is mainly performed by a dichroic filter. However, since the polarization beam splitter has a small allowable range for the wavelengths of the S-polarized light and the P-polarized light, the laser diode serving as the light source of the laser projector must use a laser diode having a wavelength conforming to the optical characteristics of the polarization beam splitter. body. Please refer to FIG. 1 for illustrating the optical characteristics of the polarization beam splitter. Wherein, curve 110 is used to represent the optical characteristics of the polarization beam splitter for P-polarized light, curve 120 is used to represent the optical characteristics of the polarization beam splitter for S-polarized light, and curve 130 is used to represent the laser diode in the laser projector. The wavelength distribution of the laser beam emitted by the body. As can be seen from curve 130, the wavelength of the laser beam is approximately 460 nm. When the laser beam is S-polarized light, since the transmittance of the laser beam to the polarization beam splitter is almost equal to 0%, the polarization beam splitter reflects the laser beam. When the laser beam is P-polarized, the laser beam can penetrate the polarization beam splitter because the penetration rate of the laser beam to the polarization beam splitter is almost equal to 100%. Wherein, the wavelength difference between the curves 110 and 120 is called the spectral gap of the polarization beam splitter, and when the spectral gap is not wide enough, the laser as the laser source is limited in the process of manufacturing the laser projector. The selectivity of the diode. Furthermore, since the laser diodes have a wavelength tolerance of about ±5 nm, if the wavelength deviation of some of the laser diodes in the laser projector source is large, the projector will be combined. The efficiency is deteriorated, which in turn affects the brightness of the projector.
本發明一實施例揭露一種雷射投影機，其包含雷射光源、擴散片、偏振分光鏡、四分之一波片及螢光粉色輪。其中，雷射光源用以產生沿第一光徑行進的雷射光束。擴散片設於第一光徑上，用以擴散雷射光束以產生擴散光束。其中擴散光束相對於雷射光束的半峰半寬度大於等於1.5度且小於等於3度。偏振分光鏡用以反射擴散光束，以產生沿第二光徑行進的反射光束。四分之一波片設於第二光徑上，用以將反射光束轉換成第一圓偏振光束。螢光粉色輪用以接收第一圓偏振光束，以產生逆第二光徑的第二圓偏振光束及受激光束。此外，四分之一波片還用以將第二圓偏振光束轉換成P偏振光束，而偏振分光鏡允許上述的P偏振光束及受激光束穿透。An embodiment of the invention discloses a laser projector comprising a laser light source, a diffusion sheet, a polarization beam splitter, a quarter wave plate and a fluorescent pink wheel. Wherein, the laser light source is used to generate a laser beam traveling along the first optical path. The diffusion sheet is disposed on the first optical path for diffusing the laser beam to generate a diffused beam. The half-width half-width of the diffused light beam with respect to the laser beam is greater than or equal to 1.5 degrees and less than or equal to 3 degrees. A polarizing beam splitter is used to reflect the diffused light beam to produce a reflected light beam traveling along the second optical path. The quarter wave plate is disposed on the second optical path for converting the reflected beam into the first circularly polarized beam. A fluorescent pink wheel is used to receive the first circularly polarized beam to produce a second circularly polarized beam and a received laser beam opposite the second optical path. In addition, the quarter-wave plate is also used to convert the second circularly polarized beam into a P-polarized beam, and the polarizing beam splitter allows the P-polarized beam to be penetrated by the laser beam.
本發明另一實施例揭露一種雷射投影機，其包括雷射光源、擴散片、偏振分光鏡、四分之一波片以及螢光粉色輪。其中，雷射光源用以產生沿第一光徑行進的雷射光束。擴散片設於第一光徑上，用以擴散雷射光束以產生擴散光束。偏振分光鏡用以反射擴散光束，以產生沿第二光徑行進的反射光束。其中擴散光束相對於偏振分光鏡的入射角大於45度且小於或等於50度。四分之一波片設於第二光徑上，用以將反射光束轉換成第一圓偏振（circular polarized）光束。螢光粉色輪用以接收第一圓偏振光束，以產生逆第二光徑的第二圓偏振光束及受激光束。其中，四分之一波片還用以將第二圓偏振光束轉換成P偏振（P-polarized）光束，而偏振分光鏡允許上述的P偏振光束及該受激穿透。Another embodiment of the present invention discloses a laser projector including a laser light source, a diffusion sheet, a polarization beam splitter, a quarter wave plate, and a fluorescent pink wheel. Wherein, the laser light source is used to generate a laser beam traveling along the first optical path. The diffusion sheet is disposed on the first optical path for diffusing the laser beam to generate a diffused beam. A polarizing beam splitter is used to reflect the diffused light beam to produce a reflected light beam traveling along the second optical path. The incident angle of the diffused beam with respect to the polarization beam splitter is greater than 45 degrees and less than or equal to 50 degrees. A quarter wave plate is disposed on the second optical path for converting the reflected beam into a first circular polarized beam. A fluorescent pink wheel is used to receive the first circularly polarized beam to produce a second circularly polarized beam and a received laser beam opposite the second optical path. Wherein, the quarter wave plate is also used to convert the second circularly polarized beam into a P-polarized beam, and the polarization beam splitter allows the P-polarized beam and the stimulated penetration.
在本發明之實施例中的雷射投影機，可藉由使用特定的擴散片而降低螢光粉色輪發生熱淬滅（thermal quenching）現象的機率。此外，藉由使擴散光束相對於偏振分光鏡的入射角大於45度且小於或等於50度，可擴大偏振分光鏡的譜間隙（spectral gap），進而提升用來做為雷射光源的雷射二極體之選擇性。In the laser projector of the embodiment of the present invention, the probability of occurrence of thermal quenching of the fluorescent pink wheel can be reduced by using a specific diffusion sheet. In addition, by making the incident angle of the diffused light beam with respect to the polarization beam splitter greater than 45 degrees and less than or equal to 50 degrees, the spectral gap of the polarization beam splitter can be enlarged, thereby improving the laser used as the laser light source. The selectivity of the diode.
請參考第2圖，第2圖為本發明一實施例之雷射投影機200的示意圖。雷射投影機200包含雷射光源210、擴散片230、偏振分光鏡（dichroic filter）240、四分之一波片（quarter-wave plate）242及螢光粉色輪（phosphor wheel）250。其中，雷射光源210用以產生沿第一光徑L1行進的雷射光束S1，而在本實施例中，雷射光束S1為S偏振（S-polarized）光束。此外，擴散片230設於第一光徑L1上，用以擴散雷射光束S1以產生擴散光束S2。擴散片230的主要功能在於降低甚至消除螢光粉色輪250發生熱淬滅（thermal quenching）現象的機率，而這部分將於後面段落中進一步地說明。偏振分光鏡240則用以反射擴散光束S2（S偏振），以產生沿第二光徑L2行進的反射光束R2，而反射光束R2也會是S偏振。另外，四分之一波片242設於第二光徑L2上，用以將反射光束R2轉換成第一圓偏振（circular polarized）光束C1。螢光粉色輪250會接收第一圓偏振光束C1，並因而產生逆第二光徑L2的照明光束M，其中照明光束M包含有第二圓偏振光束C2與受激光P0。請參考第3圖，第3圖是第2圖中的螢光粉色輪250的示意圖。螢光粉色輪250具有反射層251以及設置於反射層251上的螢光粉塗佈區252(以斜線表示)。其中，反射層251可以是一個金屬層，而螢光粉塗佈區252塗佈有螢光粉。螢光粉塗佈區252佔整個反射層251的比例可藉由夾角π調整。反射層251會反射第一圓偏振光束C1為第二圓偏振光束C2，而螢光粉塗佈區252用以受第一圓偏振光束C1的激發而產生受激光P0（即螢光）。其中，受激光P0為非偏振光。請再參考第2圖，當照明光束M（第二圓偏振光束C2與受激光P0）以逆第二光徑L2的方向穿透四分之一波片242時，第二圓偏振光束C2會被四分之一波片242轉換成P偏振（P-polarized）光束P1。此外。偏振分光鏡240允許P偏振光束P1及受激光P0穿透。其中，由於偏振分光鏡240具有上述的光學特性，可以用以反射擴散光束S2，並允許P偏振光束P1與受激光P0穿透，故有利於雷射投影機200體積的縮小化。Please refer to FIG. 2, which is a schematic diagram of a laser projector 200 according to an embodiment of the present invention. The laser projector 200 includes a laser light source 210, a diffusion sheet 230, a dichroic filter 240, a quarter-wave plate 242, and a phosphor wheel 250. The laser source 210 is used to generate the laser beam S1 traveling along the first optical path L1. In the embodiment, the laser beam S1 is an S-polarized beam. In addition, the diffusion sheet 230 is disposed on the first optical path L1 for diffusing the laser beam S1 to generate the diffused light beam S2. The primary function of the diffuser 230 is to reduce or even eliminate the chance of thermal quenching of the fluorescent pink wheel 250, as will be further explained in the following paragraphs. The polarization beam splitter 240 is configured to reflect the diffused light beam S2 (S polarization) to generate a reflected light beam R2 traveling along the second optical path L2, and the reflected light beam R2 is also S-polarized. In addition, a quarter wave plate 242 is disposed on the second optical path L2 for converting the reflected light beam R2 into a first circular polarized light beam C1. The fluorescent pink wheel 250 receives the first circularly polarized beam C1 and thus produces an illumination beam M opposite the second optical path L2, wherein the illumination beam M comprises a second circularly polarized beam C2 and a received laser P0. Please refer to FIG. 3, which is a schematic diagram of the fluorescent pink wheel 250 in FIG. The fluorescent pink wheel 250 has a reflective layer 251 and a phosphor coating area 252 (shown by oblique lines) disposed on the reflective layer 251. The reflective layer 251 may be a metal layer, and the phosphor coating area 252 is coated with a phosphor powder. The proportion of the phosphor coating area 252 to the entire reflective layer 251 can be adjusted by the angle π. The reflective layer 251 reflects the first circularly polarized light beam C1 as the second circularly polarized light beam C2, and the phosphor powder coating region 252 is used to generate the received laser light P0 (ie, fluorescent light) by the excitation of the first circularly polarized light beam C1. Among them, the received laser light P0 is unpolarized light. Referring again to FIG. 2, when the illumination beam M (the second circularly polarized beam C2 and the received laser beam P0) penetrates the quarter-wave plate 242 in the direction opposite to the second optical path L2, the second circularly polarized beam C2 will The quarter wave plate 242 is converted into a P-polarized light beam P1. Also. The polarization beam splitter 240 allows the P-polarized beam P1 to be penetrated by the laser beam P0. Wherein, since the polarization beam splitter 240 has the above optical characteristics, it can be used to reflect the diffused light beam S2 and allow the P-polarized light beam P1 to penetrate the received laser light P0, thereby facilitating the reduction of the volume of the laser projector 200.
為了降低甚至消除螢光粉色輪250發生熱淬滅現象的機率，雷射投影機200會藉由擴散片230的作用而使得擴散光束S2相對於雷射光束S1的半峰半寬度（Half Width At Half-Maximum；HWHM）大於等於1.5度且小於等於3度。請參考第4圖及第5圖。第4圖為用以說明擴散片230的半峰半寬度（HWHM）的定義及量測方式，而第5圖則是第4圖中光點420的能量分佈圖。當雷射光源210所產生的雷射光束S1通過擴散片230時，會產生擴散光束410。當擴散光束410照射在受照面430上時，會在受照面430上產生光點420。其中，擴散光束410在圖中的幾何中心線412與擴散光束410的邊緣之間的夾角為α。第5圖的曲線500表示光點420的擴散角度與能量分佈比之間的關係，其中橫軸表示擴散光束410的擴散角度。擴散角度等於0之處即相對於幾何中心線412與受照面430相交之點，且此相交點所對應的能量分佈比係定義為100%。隨著擴散光束410的擴散角度越大，所對應的能量分佈比會越低。當能量分佈比為50%時，第5圖中A點至B點之間所對應的擴散角度定義為全峰半寬度（Full Width At Half-Maximum；FWHM）F1，而全峰半寬度F1的一半即為半峰半寬度（HWHM）H1。眾所習知，擴散片的霧度（Haze）與半峰半寬度屬大致正相關。在本發明之實施例中，以半峰半寬度等效代表霧度，而擴散片230的霧度與半峰半寬度之間的關係如第6圖及第7圖所示。擴散片230的半峰半寬度H1可大於等於1.5度且小於等於3度，以使光線照到螢光粉色輪250不會過於集中，進而降低甚至消除螢光粉色輪250發生熱淬滅現象的機率。In order to reduce or even eliminate the probability of thermal quenching of the fluorescent pink wheel 250, the laser projector 200 will make the half-width of the diffused beam S2 relative to the laser beam S1 by the action of the diffuser 230 (Half Width At Half-Maximum; HWHM) is greater than or equal to 1.5 degrees and less than or equal to 3 degrees. Please refer to Figures 4 and 5. Fig. 4 is a view for explaining the definition and measurement of the half width at half maximum (HWHM) of the diffusion sheet 230, and Fig. 5 is an energy distribution diagram of the light spot 420 in Fig. 4. When the laser beam S1 generated by the laser source 210 passes through the diffusion sheet 230, a diffused beam 410 is generated. When the diffused light beam 410 is incident on the illuminated surface 430, a spot 420 is created on the illuminated surface 430. Wherein, the angle between the geometric centerline 412 of the diffused beam 410 and the edge of the diffused beam 410 is α. The curve 500 of Fig. 5 shows the relationship between the diffusion angle of the light spot 420 and the energy distribution ratio, wherein the horizontal axis represents the diffusion angle of the diffusion beam 410. The diffusion angle is equal to 0, that is, the point at which the geometric center line 412 intersects the illuminated surface 430, and the energy distribution ratio corresponding to the intersection is defined as 100%. As the diffusion angle of the diffused beam 410 is larger, the corresponding energy distribution ratio will be lower. When the energy distribution ratio is 50%, the diffusion angle corresponding to the point A to point B in Fig. 5 is defined as the full Width At Half-Maximum (FWHM) F1, and the full peak half width F1. Half is half-width half-width (HWHM) H1. It is well known that the haze of a diffuser is roughly positively correlated with the half-width and half-width. In the embodiment of the present invention, the half-width and the half-width are equivalently represented as haze, and the relationship between the haze of the diffusion sheet 230 and the half-width and the half-width is as shown in Figs. 6 and 7. The half-width half-width H1 of the diffusion sheet 230 may be greater than or equal to 1.5 degrees and less than or equal to 3 degrees, so that the light shining onto the fluorescent pink wheel 250 is not excessively concentrated, thereby reducing or even eliminating the thermal quenching of the fluorescent pink wheel 250. Probability.
此外，因擴散片230的霧度會影響到雷射光束S1之偏振態比例以及雷射投影機200之投影亮度輸出比例，而雷射光束S1之偏振態比例會影響到投影機20的合光效率，故為避免因選用到不合適的擴散片230而影響到雷射投影機200的正常表現，需選用具有合適半峰半寬度的擴散片230。為進一步地瞭解擴散片230的半峰半寬度對於雷射光源210所產生的雷射光束S1之偏振態比例以及對於雷射投影機200之投影亮度輸出比例的影響，請參考第8圖及第9圖。第8圖為擴散片230的半峰半寬度與雷射光束S1之偏振態比例的關係圖，而第9圖為擴散片230的半峰半寬度與雷射投影機200之投影亮度輸出比例的關係圖。由第8圖可看出，雷射光束S1之偏振態比例會隨著擴散片230的半峰半寬度增加而減少，故擴散片230的半峰半寬度不能太高，以免嚴重地影響到雷射光束S1之偏振態比例及投影機20的合光效率。另外，由第9圖可看出，當擴散片230的半峰半寬度H1介於2度至3度之間時，雷射投影機200具有最大值的投影亮度輸出比例。因此，在綜合考量雷射光束S1之偏振態比例以及雷投影機200之投影亮度輸出比例之後，選用其半峰半寬度H1為大於等於1.5度且小於等於3度的擴散片230是較佳的選擇。In addition, since the haze of the diffusion sheet 230 affects the polarization state ratio of the laser beam S1 and the projection brightness output ratio of the laser projector 200, the polarization ratio of the laser beam S1 affects the combined light of the projector 20. Efficiency, so to avoid affecting the normal performance of the laser projector 200 due to the selection of the improper diffusion sheet 230, a diffusion sheet 230 having a suitable half width and a half width is required. To further understand the effect of the half-width half-width of the diffuser 230 on the polarization state of the laser beam S1 produced by the laser source 210 and the projection brightness ratio of the laser projector 200, please refer to FIG. 8 and 9 picture. 8 is a graph showing the relationship between the half-width and half-width of the diffusion sheet 230 and the polarization ratio of the laser beam S1, and FIG. 9 is the ratio of the half-width and half-width of the diffusion sheet 230 to the projection luminance of the laser projector 200. relation chart. It can be seen from Fig. 8 that the polarization ratio of the laser beam S1 decreases as the half-width half-width of the diffusion sheet 230 increases, so that the half-width half-width of the diffusion sheet 230 cannot be too high, so as not to seriously affect the lightning. The ratio of the polarization state of the beam S1 and the junction efficiency of the projector 20. In addition, as can be seen from FIG. 9, when the half-width half-width H1 of the diffusion sheet 230 is between 2 degrees and 3 degrees, the laser projector 200 has a projection luminance output ratio of the maximum value. Therefore, after comprehensively considering the polarization state ratio of the laser beam S1 and the projection luminance output ratio of the lightning projector 200, it is preferable to select the diffusion sheet 230 whose half-width half-width H1 is 1.5 degrees or more and 3 degrees or less. select.
在本發明一實施例中，雷射模組210可具有多個雷射二極體。請參考第10圖，第10圖為本發明一實施例之雷射模組210的結構示意圖。在此一實施例中，雷射模組210具有多個雷射二極體312、多個雷射二極體314、多個反射鏡318。雷射二極體312及314分別產生雷射射線315，而每一雷射二極體314所產生的雷射射線315會經由對應的反射鏡318反射至透鏡221。雷射二極體312所產生雷射射線315會通過反射鏡318旁的間隙而射向透鏡221。透鏡221會匯聚雷射二極體312及314所產生雷射射線315而形成雷射光束S1。藉由這樣的設置，雷射模組210所產生的雷射光束S1的亮度會較單一雷射二極體所產生的光束之亮度大許多倍。此外，藉由反射鏡318的設置，可降低雷射模組210之單位面積的雷射二極體的數目，而有助於散熱。In an embodiment of the invention, the laser module 210 can have a plurality of laser diodes. Please refer to FIG. 10 , which is a schematic structural diagram of a laser module 210 according to an embodiment of the present invention. In this embodiment, the laser module 210 has a plurality of laser diodes 312, a plurality of laser diodes 314, and a plurality of mirrors 318. The laser diodes 312 and 314 respectively generate laser rays 315, and the laser rays 315 generated by each of the laser diodes 314 are reflected to the lens 221 via the corresponding mirrors 318. The laser beam 315 generated by the laser diode 312 is directed toward the lens 221 through a gap beside the mirror 318. The lens 221 converges the laser beam 315 generated by the laser diodes 312 and 314 to form a laser beam S1. With such an arrangement, the brightness of the laser beam S1 produced by the laser module 210 is many times greater than the brightness of the beam produced by a single laser diode. In addition, by the arrangement of the mirror 318, the number of laser diodes per unit area of the laser module 210 can be reduced, which contributes to heat dissipation.
在本發明一實施例中，雷射光源210係採用為藍光雷射二極體，故雷射光束S1為藍光雷射光束。應了解的是，亦可採用紫外或近紫外雷射模組，以產生紫外或近紫外雷射光束。In an embodiment of the invention, the laser source 210 is a blue laser diode, so the laser beam S1 is a blue laser beam. It should be understood that an ultraviolet or near-ultraviolet laser module can also be used to generate an ultraviolet or near-ultraviolet laser beam.
請再參考第2圖。在本發明一實施例中，雷射投影機200可另包含第一透鏡組220，設於雷射光源210及擴散片230之間，用以準直並縮小雷射光束S1至擴散片230。其中，第一透鏡組220可包含透鏡221及222。Please refer to Figure 2 again. In an embodiment of the invention, the laser projector 200 may further include a first lens group 220 disposed between the laser light source 210 and the diffusion sheet 230 for collimating and reducing the laser beam S1 to the diffusion sheet 230. The first lens group 220 may include lenses 221 and 222.
在本發明一實施例中，雷射投影機200可另包含第二透鏡組270，設於四分之一波片242及螢光粉色輪250之間，用以將第一圓偏振光束C1匯聚至螢光粉色輪250。其中，第二透鏡組270可包含透鏡271及272。In an embodiment of the invention, the laser projector 200 may further include a second lens group 270 disposed between the quarter wave plate 242 and the fluorescent pink wheel 250 for collecting the first circularly polarized light beam C1. To the fluorescent pink wheel 250. The second lens group 270 may include lenses 271 and 272.
在本發明一實施例中，雷射投影機200可另包含聚焦透鏡282及光管（light rod）280。其中，聚焦透鏡282設於偏振分光鏡240及光管280之間，並用以將來自偏振分光鏡240的P偏振光束P1及受激光P0匯聚至光管280。In an embodiment of the invention, the laser projector 200 may further include a focusing lens 282 and a light rod 280. The focusing lens 282 is disposed between the polarization beam splitter 240 and the light pipe 280 and is used to concentrate the P-polarized light beam P1 and the received laser light P0 from the polarization beam splitter 240 to the light pipe 280.
在本發明一實施例中，雷射投影機200可另包含驅動模組260，用以驅動螢光粉色輪250轉動。In an embodiment of the invention, the laser projector 200 can further include a driving module 260 for driving the fluorescent pink wheel 250 to rotate.
此外，為擴大偏振分光鏡240的譜間隙（spectral gap），以進一步提升雷射模組210的雷射二極體之波長的可選用範圍，擴散光束S2相對於偏振分光鏡240的入射角θ可大於45度且小於或等於50度。請參考第11圖，第11圖為本發明一實施例中入射角θ與偏振分光鏡240之穿透率的關係圖。其中，曲線P45、P48及P50用以表示當入射角θ分別為45度、48度及50度時，P偏振光束（如：P偏振光束P1）對於偏振分光鏡240的穿透率。另外，曲線S45、S48及S50用以表示當入射角θ分別為45度、48度及50度時，S偏振光（如：擴散光束S2）對於偏振分光鏡240的穿透率。其中，曲線P45與曲線S45之間的波長間距即是當入射角θ為45度時，偏振分光鏡240的譜間隙。同理，曲線P48與曲線S48之間的波長間距即是當入射角θ為48度時，偏振分光鏡240的譜間隙；而曲線P50與曲線S50之間的波長間距即是當入射角θ為50度時，偏振分光鏡240的譜間隙。由第11圖可看出，當入射角θ越大時，偏振分光鏡240的譜間隙會越大。當偏振分光鏡240的譜間隙越大，可涵蓋波長公差較大的雷射二極體做為雷射光源，亦提高雷射模組210的雷射二極體的選擇性。In addition, in order to enlarge the spectral gap of the polarization beam splitter 240 to further increase the optional range of the wavelength of the laser diode of the laser module 210, the incident angle θ of the diffused beam S2 with respect to the polarization beam splitter 240 It can be greater than 45 degrees and less than or equal to 50 degrees. Please refer to FIG. 11. FIG. 11 is a diagram showing the relationship between the incident angle θ and the transmittance of the polarization beam splitter 240 according to an embodiment of the present invention. The curves P45, P48, and P50 are used to indicate the transmittance of the P-polarized beam (eg, the P-polarized beam P1) to the polarization beam splitter 240 when the incident angle θ is 45 degrees, 48 degrees, and 50 degrees, respectively. In addition, the curves S45, S48, and S50 are used to indicate the transmittance of the S-polarized light (eg, the diffused light beam S2) to the polarization beam splitter 240 when the incident angle θ is 45 degrees, 48 degrees, and 50 degrees, respectively. The wavelength interval between the curve P45 and the curve S45 is the spectral gap of the polarization beam splitter 240 when the incident angle θ is 45 degrees. Similarly, the wavelength spacing between the curve P48 and the curve S48 is the spectral gap of the polarization beam splitter 240 when the incident angle θ is 48 degrees; and the wavelength spacing between the curve P50 and the curve S50 is when the incident angle θ is At 50 degrees, the spectral gap of the polarization beam splitter 240. As can be seen from Fig. 11, when the incident angle θ is larger, the spectral gap of the polarization beam splitter 240 is larger. When the spectral gap of the polarization beam splitter 240 is larger, the laser diode having a larger wavelength tolerance can be used as the laser source, and the selectivity of the laser diode of the laser module 210 is also improved.
此外，雖然藉由調整入射角θ可擴大偏振分光鏡240的譜間隙，但卻會影響雷射投影機200的合光效率，故在調整入射角θ時，需考量到雷射投影機200的合光效率。請參考第12圖，第12圖為本發明一實施例中入射角θ與雷射投影機200之合光效率的關係圖。由第12圖可知，當入射角介於45度及50度之間時，雷射投影機200之合光效率可維持在96%以上。因此，可將入射角θ設定為大於45度且小於或等於50度，即可在使雷射投影機200維持具有足夠的合光效率之情形下，擴大偏振分光鏡240的譜間隙。更詳細的偏振分光鏡240的譜間隙以及雷射投影機200之合光效率之數據則可參照第13圖中的表格。In addition, although the spectral gap of the polarization beam splitter 240 can be enlarged by adjusting the incident angle θ, it affects the light combining efficiency of the laser projector 200. Therefore, when adjusting the incident angle θ, it is necessary to consider the laser projector 200. Light combining efficiency. Referring to FIG. 12, FIG. 12 is a diagram showing the relationship between the incident angle θ and the light combining efficiency of the laser projector 200 according to an embodiment of the present invention. As can be seen from Fig. 12, when the incident angle is between 45 degrees and 50 degrees, the light combining efficiency of the laser projector 200 can be maintained at 96% or more. Therefore, the incident angle θ can be set to be greater than 45 degrees and less than or equal to 50 degrees, that is, the spectral gap of the polarization beam splitter 240 can be enlarged while the laser projector 200 is maintained to have sufficient light combining efficiency. The data of the spectral gap of the polarization beam splitter 240 and the light combining efficiency of the laser projector 200 can be referred to the table in Fig. 13.
綜上所述，在本發明之實施例中的雷射投影機中，可藉由使用特定的擴散片而降低螢光粉色輪發生熱淬滅（thermal quenching）現象的機率。此外，藉由使擴散光束相對於偏振分光鏡的入射角大於45度且小於或等於50度，可擴大偏振分光鏡的譜間隙（spectral gap），進而提升用來做為雷射光源的雷射二極體之選擇性。 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。In summary, in the laser projector of the embodiment of the present invention, the probability of occurrence of thermal quenching of the fluorescent pink wheel can be reduced by using a specific diffusion sheet. In addition, by making the incident angle of the diffused light beam with respect to the polarization beam splitter greater than 45 degrees and less than or equal to 50 degrees, the spectral gap of the polarization beam splitter can be enlarged, thereby improving the laser used as the laser light source. The selectivity of the diode. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
110、120、130、500、S45、S48 、S50、P45、P48、P50‧‧‧曲線110, 120, 130, 500, S45, S48, S50, P45, P48, P50‧‧‧ curves
200‧‧‧雷射投影機200‧‧‧Laser Projector
210‧‧‧雷射光源210‧‧‧Laser light source
220‧‧‧第一透鏡組220‧‧‧First lens group
221、222、271、272‧‧‧透鏡221, 222, 271, 272‧ ‧ lenses
230‧‧‧擴散片230‧‧‧Diffuser
240‧‧‧偏振分光鏡240‧‧‧Polarizing beam splitter
242‧‧‧四分之一波片242‧‧‧ Quarter wave plate
250‧‧‧螢光粉色輪250‧‧‧Fluorescent pink wheel
251‧‧‧反射層251‧‧‧reflective layer
252‧‧‧螢光粉塗佈區252‧‧‧Flame powder coating area
260‧‧‧驅動模組260‧‧‧ drive module
270‧‧‧第二透鏡組270‧‧‧second lens group
280‧‧‧光管280‧‧‧ light pipe
282‧‧‧聚焦透鏡282‧‧‧focus lens
312、314‧‧‧雷射二極體312, 314‧‧ ‧ laser diode
315‧‧‧雷射射線315‧‧‧Laser rays
318‧‧‧反射鏡318‧‧‧Mirror
410、S2‧‧‧擴散光束410, S2‧‧‧ diffused beam
412‧‧‧幾何中心線412‧‧‧Geometry centerline
420‧‧‧光點420‧‧‧ light spots
430‧‧‧受照面430‧‧‧ illuminated face
A、B‧‧‧點A, B‧‧ points
C1‧‧‧圓偏振光束C1‧‧‧Circularly polarized beam
C2‧‧‧反射光C2‧‧‧ reflected light
L1‧‧‧第一光徑L1‧‧‧ first light path
L2‧‧‧第二光徑L2‧‧‧second light path
M‧‧‧照明光束M‧‧‧ illumination beam
P0‧‧‧受激光P0‧‧‧ by laser
P1‧‧‧P偏振光束P1‧‧‧P polarized beam
R2‧‧‧反射光束R2‧‧‧ reflected beam
S1‧‧‧雷射光束S1‧‧‧Laser beam
α、π‧‧‧角度、, π‧‧‧ angle
θ‧‧‧入射角Θ‧‧‧incident angle
第1圖用以說明偏振分光鏡的光學特性。 第2圖為本發明一實施例之雷射投影機的示意圖。 第3圖為本發明一實施例之螢光粉色輪的示意圖。 第4圖為用以說明擴散片的半峰半寬度的定義及量測方式。 第5圖則是第4圖中光點的能量分佈圖。 第6圖為第2圖中所使用的擴散片的霧度與半峰半寬度之間的關係圖。 第7圖為一表格，用以說明第2圖中所使用的擴散片之霧度與其對應的半峰半寬度。 第8圖為擴散片的半峰半寬度與雷射光束之偏振態比例的關係圖。 第9圖為擴散片的半峰半寬度與雷射投影機之投影亮度輸出比例的關係圖。 第10圖為本發明一實施例之雷射模組的結構示意圖。 第11圖為本發明一實施例中入射角θ與偏振分光鏡之穿透率的關係圖。 第12圖為本發明一實施例中入射角θ與雷射投影機之合光效率的關係圖。 第13圖為一表格，用以說明不同的入射角θ所對應的偏振分光鏡之譜間隙以及雷射投影機之合光效率。Figure 1 is a diagram for explaining the optical characteristics of a polarization beam splitter. 2 is a schematic view of a laser projector according to an embodiment of the present invention. Fig. 3 is a schematic view showing a fluorescent pink wheel according to an embodiment of the present invention. Fig. 4 is a view for explaining the definition and measurement method of the half-width and half-width of the diffusion sheet. Figure 5 is an energy distribution diagram of the light spot in Figure 4. Fig. 6 is a graph showing the relationship between the haze and the half width at half maximum of the diffusion sheet used in Fig. 2. Figure 7 is a table for explaining the haze of the diffusion sheet used in Fig. 2 and its corresponding half-width and half-width. Figure 8 is a graph showing the relationship between the half-width and half-width of the diffuser and the polarization of the laser beam. Figure 9 is a graph showing the relationship between the half-width and half-width of the diffuser and the projected brightness output ratio of the laser projector. FIG. 10 is a schematic structural view of a laser module according to an embodiment of the present invention. Figure 11 is a graph showing the relationship between the incident angle θ and the transmittance of the polarization beam splitter in an embodiment of the present invention. Figure 12 is a graph showing the relationship between the incident angle θ and the light combining efficiency of a laser projector according to an embodiment of the present invention. Figure 13 is a table for explaining the spectral gap of the polarization beam splitter corresponding to different incident angles θ and the light combining efficiency of the laser projector.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW106122481A TW201907222A (en) | 2017-07-05 | 2017-07-05 | Laser projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW106122481A TW201907222A (en) | 2017-07-05 | 2017-07-05 | Laser projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TW201907222A true TW201907222A (en) | 2019-02-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW106122481A TW201907222A (en) | 2017-07-05 | 2017-07-05 | Laser projector |
Country Status (1)
| Country | Link |
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| TW (1) | TW201907222A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11782334B2 (en) | 2021-04-16 | 2023-10-10 | Coretronic Corporation | Illumination system and projection apparatus |
-
2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11782334B2 (en) | 2021-04-16 | 2023-10-10 | Coretronic Corporation | Illumination system and projection apparatus |
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