TWI677645B

TWI677645B - Illumination device

Info

Publication number: TWI677645B
Application number: TW108102576A
Authority: TW
Inventors: 紀政宏; Cheng-Hung Chi
Original assignee: 奇景光電股份有限公司; Himax Technologies Limited
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2019-11-21
Also published as: TW202028649A

Abstract

一種照明裝置，包括一光源陣列以及一繞射光學元件（DOE）。光源陣列包括以一陣列排列的多個點光源。繞射光學元件包括分別與這些點光源對準的多個繞射區域。這些繞射區域分別將光從這些點光源繞射至一待照明物體，用以重疊光，以在待照明物體上形成一均勻明亮區域。A lighting device includes a light source array and a diffractive optical element (DOE). The light source array includes a plurality of point light sources arranged in an array. The diffractive optical element includes a plurality of diffractive regions respectively aligned with the point light sources. These diffractive regions diffract light from the point light sources to an object to be illuminated, respectively, to overlap the light to form a uniform and bright area on the object to be illuminated.

Description

照明裝置Lighting device

本發明是有關於一種光學裝置，且特別是有關於一種照明裝置。The present invention relates to an optical device, and more particularly to a lighting device.

照明器廣泛用於各個區域。在許多情況下，需要光源來照明被看見或被拍攝的目標，這可以藉由照明器來實現。在一些拍攝場合，需要均勻照明來改善影像的品質，並且還需要足夠的亮度。Illuminators are widely used in various areas. In many cases, a light source is needed to illuminate the object being seen or photographed, and this can be achieved by an illuminator. In some shooting situations, uniform lighting is needed to improve the image quality, and sufficient brightness is also required.

採用雷射發射器作為發光器中的發光裝置可以增加亮度，但是雷射發射器所發射的光束通常具有小的發散角。光束的小發散角容易降低照明的均勻性。為了在使用具有小的發散角的光束的發光裝置時增加照明的均勻性，可以採用各種光學元件來增加發散角。然而，使用光學元件增大了整個光學系統（即照明器）的體積。一般而言，發散角越小，採用光學元件的整個光學系統的體積越大。Using a laser emitter as a light emitting device in a light emitter can increase brightness, but the light beam emitted by the laser emitter usually has a small divergence angle. The small divergence angle of the light beam easily reduces the uniformity of the illumination. In order to increase the uniformity of illumination when a light emitting device having a light beam with a small divergence angle is used, various optical elements may be employed to increase the divergence angle. However, the use of optical elements increases the size of the entire optical system (ie, the illuminator). In general, the smaller the divergence angle, the larger the volume of the entire optical system using the optical element.

本發明提供一種照明裝置，其結構有助於減少照明裝置的體積。The invention provides a lighting device with a structure that helps to reduce the volume of the lighting device.

根據本發明的實施例所提供的照明裝置包括一光源陣列以及繞射光學元件。光源陣列包括以一陣列排列的多個點光源。繞射光學元件包括分別與這些點光源對準的多個繞射區域。這些繞射區域分別將來自這些點光源的光繞射至一待照明物體，用以重疊光，以在待照明物體上形成一均勻明亮區域。The lighting device according to the embodiment of the present invention includes a light source array and a diffractive optical element. The light source array includes a plurality of point light sources arranged in an array. The diffractive optical element includes a plurality of diffractive regions respectively aligned with the point light sources. The diffractive regions diffract light from the point light sources to an object to be illuminated, respectively, to overlap the light to form a uniform and bright area on the object to be illuminated.

在根據本發明實施例的照明裝置中，繞射區域分別與多個點光源對準，並且分別將光從這些點光源繞射至待照明物體，使得繞射光學元件和光源陣列之間的間距可被減少。因此，根據本發明實施例的照明裝置可以具有較小的體積。In the lighting device according to the embodiment of the present invention, the diffraction regions are respectively aligned with a plurality of point light sources, and the light is respectively diffracted from the point light sources to the object to be illuminated, so that the distance between the diffractive optical element and the light source array Can be reduced. Therefore, the lighting device according to the embodiment of the present invention can have a smaller volume.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

現將詳細地參考本發明的示範性實施例，示範性實施例的實例說明於附圖中。只要有可能，相同元件符號在附圖和描述中用來表示相同或相似部分。Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

圖1是根據本發明的實施例的照明裝置的示意性剖視圖。圖2A是圖1中的光源陣列的示意性上視圖。圖2B和2C是根據本發明的兩個實施例，圖1中區域R的放大圖。圖3示出了由圖1中的照明裝置所照明的待照明物體上的均勻明亮區域。請參照圖1、2A-2C與3，本實施例的照明裝置100包括一光源陣列110以及一繞射光學元件120。光源陣列110包括以一陣列排列的多個點光源112。在本實施例中，光源陣列110為雷射光源陣列。例如，光源陣列110是垂直共振腔面射型雷射（Vertical Cavity Surface Emitting Laser, VCSEL），並且，如圖2A所示，這些點光源112分別是垂直共振腔面射型雷射的光輸出的開口。然而，在其他實施例中，光源陣列110可以是雷射二極體陣列，且這些點光源112分別是雷射二極體。FIG. 1 is a schematic sectional view of a lighting device according to an embodiment of the present invention. FIG. 2A is a schematic top view of the light source array in FIG. 1. 2B and 2C are enlarged views of a region R in FIG. 1 according to two embodiments of the present invention. FIG. 3 shows a uniformly bright area on an object to be illuminated illuminated by the lighting device in FIG. 1. Please refer to FIGS. 1, 2A-2C, and 3. The lighting device 100 of this embodiment includes a light source array 110 and a diffractive optical element 120. The light source array 110 includes a plurality of point light sources 112 arranged in an array. In this embodiment, the light source array 110 is a laser light source array. For example, the light source array 110 is a vertical cavity surface emitting laser (VCSEL), and, as shown in FIG. 2A, these point light sources 112 are light outputs of the vertical cavity surface emitting laser, respectively. Opening. However, in other embodiments, the light source array 110 may be a laser diode array, and the point light sources 112 are laser diodes, respectively.

繞射光學元件包括分別與這些點光源112對準的多個繞射區域A。這些繞射區域A分別將來自這些點光源112的光113繞射至一待照明物體50，用以重疊光113，以在待照明物體50上形成一均勻明亮區域60。在本實施例中，由從每一點光源發射並由相應的繞射區域A繞射的光所形成的待照明物體50上的光點分散至整個均勻明亮區域60上，但在光點中具有暗區域。再者，由所有點光源發出並分別被相應的繞射區域A繞射的光所形成的光點重疊，以形成均勻明亮區域60。The diffractive optical element includes a plurality of diffractive regions A respectively aligned with the point light sources 112. The diffractive regions A respectively diffract the light 113 from the point light sources 112 to an object to be illuminated 50 to overlap the light 113 to form a uniform bright area 60 on the object to be illuminated 50. In this embodiment, the light spots on the object to be illuminated 50 formed by the light emitted from each point light source and diffracted by the corresponding diffraction area A are scattered over the entire uniform bright area 60, but have Dark area. Furthermore, the light spots formed by the light emitted by all the point light sources and respectively diffracted by the corresponding diffraction area A are overlapped to form a uniform bright area 60.

在本實施例中，待照明物體50例如是牆壁。然而，在其他實施例中，待照明物體50可以是人臉、要拍攝的物體或任何其他待照明的物體。在本實施例中，均勻明亮區域60為矩形。然而，在其他實施例中，均勻明亮區域60可以是任何其他形狀。均勻明亮區域60的形狀可由繞射光學元件120的設計所決定。In this embodiment, the object to be illuminated 50 is, for example, a wall. However, in other embodiments, the object to be illuminated 50 may be a human face, an object to be photographed, or any other object to be illuminated. In this embodiment, the uniform bright area 60 is rectangular. However, in other embodiments, the uniformly bright area 60 may be any other shape. The shape of the uniform bright area 60 can be determined by the design of the diffractive optical element 120.

在根據本發明實施例的照明裝置100中，繞射區域A分別與這些點光源112對準，並分別將光113從這些點光源112繞射至待照明物體50，使得繞射光學元件120和光源陣列110之間的間距L可減小。因此，根據本發明實施例的照明裝置100可具有較小的體積。在本實施例中，繞射光學元件120和光源陣列110之間的間距L小於或等於0.1毫米，並且例如是0.05毫米。In the lighting device 100 according to the embodiment of the present invention, the diffraction regions A are respectively aligned with the point light sources 112, and the light 113 is respectively diffracted from the point light sources 112 to the object to be illuminated 50, so that the diffractive optical elements 120 and The interval L between the light source arrays 110 may be reduced. Therefore, the lighting device 100 according to an embodiment of the present invention may have a smaller volume. In this embodiment, a distance L between the diffractive optical element 120 and the light source array 110 is less than or equal to 0.1 mm, and is, for example, 0.05 mm.

在根據比較實施例的照明裝置中，繞射光學元件不具有如同圖1的實施例中的那些個別的繞射區域，並且繞射光學元件和光源陣列之間的間距大於圖1的實施例，使得在繞射光學元件上分別被從光源陣列的點光源發出的發散光照射的區域在很大程度上相互重疊。因此，在比較實施例中，繞射光學元件將所有光一起繞射至待照明物體。在比較實施例中，繞射光學元件是在假設點光源發出的光是平行光束（即平面波）的情況下所設計的。然而，實際上，點光源所發出的光具有小的發散角，使得根據比較實施例的照明裝置所形成的待照明物體上的明亮區域將模糊並且與原始設計不同，例如，照明裝置的視野（Field of View, FOV）將與原始設計不同。In the lighting device according to the comparative embodiment, the diffractive optical element does not have individual diffraction regions as those in the embodiment of FIG. 1, and the distance between the diffractive optical element and the light source array is larger than the embodiment of FIG. 1, The areas irradiated by the divergent light emitted from the point light sources of the light source array on the diffractive optical elements are largely overlapped with each other. Therefore, in the comparative embodiment, the diffractive optical element diffracts all the light to the object to be illuminated together. In the comparative embodiment, the diffractive optical element is designed on the assumption that the light emitted by the point light source is a parallel beam (that is, a plane wave). However, in reality, the light emitted by the point light source has a small divergence angle, so that the bright area on the object to be illuminated formed by the lighting device according to the comparative embodiment will be blurred and different from the original design, for example, the field of view of the lighting device ( Field of View (FOV) will be different from the original design.

反之，在根據圖1的實施例的照明裝置100中，考慮具有發散角θ的光113，繞射區域A分別與這些點光源112對準，並且分別將光113從這些點光源112繞射至待照明物體50，使得待照明物體50上的均勻明亮區域60與原始設計相同或相似，並且照明裝置100的視野是可預測的。Conversely, in the lighting device 100 according to the embodiment of FIG. 1, light 113 having a divergence angle θ is considered, the diffraction regions A are respectively aligned with the point light sources 112, and the light 113 is respectively diffracted from the point light sources 112 to The object 50 to be illuminated, so that the uniform bright area 60 on the object 50 to be illuminated is the same as or similar to the original design, and the field of view of the lighting device 100 is predictable.

在本實施例中，繞射光學元件120的表面可具有至少兩個高度階，使得繞射光學元件120可繞射光113。例如，在圖2B中，繞射光學元件120的表面具有兩個高度階，且在圖2C中，繞射光學元件的表面具有四個高度階。In this embodiment, the surface of the diffractive optical element 120 may have at least two height orders, so that the diffractive optical element 120 may diffract the light 113. For example, in FIG. 2B, the surface of the diffractive optical element 120 has two height orders, and in FIG. 2C, the surface of the diffractive optical element has four height orders.

圖4是根據本發明另一實施例的照明裝置的示意性剖視圖。請參照圖4，本實施例的照明裝置100a與圖1的照明裝置100相似，且兩者之間的主要差異如下。在圖1中，由兩個相鄰的光113在繞射光學元件120上所形成的照明區域彼此不重疊。然而，圖4中的繞射光學元件120和光源陣列110之間的間距L大於圖1中的繞射光學元件120和光源陣列110之間的間距L，使得由沿著連接兩個相鄰的點光源112的參考線N上的兩個相鄰的點光源112所分別發射的兩個相鄰的光113所分別照明的兩個區域彼此重疊。在圖4中，V是繞射光學元件上由沿著連接兩個相鄰的點光源112的參考線N上的兩個相鄰的點光源112所分別發射的兩個相鄰的光113所分別照明的兩個區域的重疊寬度。FIG. 4 is a schematic sectional view of a lighting device according to another embodiment of the present invention. Referring to FIG. 4, the lighting device 100 a of this embodiment is similar to the lighting device 100 of FIG. 1, and the main differences between the two are as follows. In FIG. 1, the illumination areas formed by the two adjacent lights 113 on the diffractive optical element 120 do not overlap each other. However, the distance L between the diffractive optical element 120 and the light source array 110 in FIG. 4 is greater than the distance L between the diffractive optical element 120 and the light source array 110 in FIG. The two areas respectively illuminated by the two adjacent lights 113 emitted by the two adjacent point light sources 112 on the reference line N of the point light source 112 overlap each other. In FIG. 4, V is the two adjacent lights 113 on the diffractive optical element respectively emitted by the two adjacent point light sources 112 along the reference line N connecting the two adjacent point light sources 112. The overlap width of the two areas illuminated separately.

在圖1和圖4的實施例中，照明裝置100或100a符合L=[E‧P/2+(P/2-D/2)]/tan(θ/2)及0≦E≦0.5，其中L為光源陣列110與繞射光學元件120之間的間距，E為係數，P是這些點光源112的節距，D是每一點光源的外徑，θ是每一光113的發散角。當照明裝置100或100a符合0≦E≦0.5時，待照明物體50上的均勻明亮區域60與原始設計相同或相似，並且照明裝置100的視野更可預測。在圖1和4的實施例中，照明裝置100或100a符合E=V/P。在圖1的實施例中，V=0且E=0。此外，在圖4的實施例中，V大於0，且0＜E≦0.5。在一實施例中，0＜E≦0.3。再者，在圖1和4中，這些點光源112以相等的間距設置，但本發明不以此為限。In the embodiments of FIGS. 1 and 4, the lighting device 100 or 100 a conforms to L = [E‧P / 2 + (P / 2-D / 2)] / tan (θ / 2) and 0 ≦ E ≦ 0.5, Where L is the distance between the light source array 110 and the diffractive optical element 120, E is a coefficient, P is the pitch of these point light sources 112, D is the outer diameter of each point light source, and θ is the divergence angle of each light 113. When the lighting device 100 or 100a meets 0 ≦ E ≦ 0.5, the uniform bright area 60 on the object to be illuminated 50 is the same as or similar to the original design, and the field of view of the lighting device 100 is more predictable. In the embodiments of FIGS. 1 and 4, the lighting device 100 or 100 a conforms to E = V / P. In the embodiment of FIG. 1, V = 0 and E = 0. In addition, in the embodiment of FIG. 4, V is greater than 0, and 0 <E ≦ 0.5. In one embodiment, 0 <E ≦ 0.3. Furthermore, in FIGS. 1 and 4, the point light sources 112 are arranged at equal intervals, but the present invention is not limited thereto.

圖5是根據圖1與4的實施例的照明裝置的待照明物體上的均勻明亮區域的不均勻性相對於重疊率的折線圖。圖6是根據圖1與4的實施例的照明裝置的效率相對於重疊率的折線圖。請參照圖1、4、5與6，由2高度階所表示的折線對應於如圖2B所示的具有繞射光學元件120的照明裝置100或100a，其表面具有兩個高度階，且由4高度階所表示的折線對應於如圖2C所示的具有繞射光學元件120的照明裝置100或100a，其表面具有四個高度階。圖5和圖6的重疊率的定義為重疊寬度V除以繞射光學元件120上的區域的擴展寬度S，該區域由沿著連接兩個相鄰的點光源112的參考線N上的每一兩個相鄰的點光源112所發射的光113所照明，即重疊率等於V/S。圖5中的不均勻性的定義為(I _max-I _min)/I _mean，其中I _max是均勻明亮區域60中的最大光強度，I _min是均勻明亮區域60中的最小光強度，而I _mean是均勻明亮區域60中的平均光強度。圖6中的效率的定義為均勻明亮區域60內的光能量除以從照明裝置100或100a所輸出的全部光能量。從圖5中可以了解到，當重疊率小於或等於15%時，均勻明亮區域60具有高的光均勻性。再者，可以從圖6中可以了解到，當重疊率小於或等於20%時，照明裝置100或100a具有高效率。還可以從圖5和6中了解到，當重疊率小於30%時，光均勻性和效率良好。 5 is a line chart of the unevenness of the uniform bright area on the object to be illuminated of the lighting device according to the embodiment of FIGS. 1 and 4 with respect to the overlap ratio. FIG. 6 is a line chart of the efficiency of the lighting device according to the embodiment of FIGS. 1 and 4 versus the overlap ratio. Please refer to FIGS. 1, 4, 5 and 6, the polyline indicated by the 2 height order corresponds to the illuminating device 100 or 100a with the diffractive optical element 120 shown in FIG. 2B, the surface of which has two height orders and The broken line indicated by the 4 height order corresponds to the illuminating device 100 or 100 a having the diffractive optical element 120 as shown in FIG. 2C, and the surface has four height orders. The overlap ratio of FIG. 5 and FIG. 6 is defined as the overlap width V divided by the expanded width S of the area on the diffractive optical element 120, which area is defined by each along the reference line N connecting two adjacent point light sources 112. The light 113 emitted by one or two adjacent point light sources 112 is illuminated, that is, the overlap ratio is equal to V / S. The non-uniformity in FIG. 5 is defined as (I _max -I _min ) / I _mean , where I _max is the maximum light intensity in the uniformly bright area 60, I _min is the minimum light intensity in the uniformly bright area 60, and I _mean is the average light intensity in the uniformly bright area 60. The efficiency in FIG. 6 is defined as the light energy in the uniform bright area 60 divided by the total light energy output from the lighting device 100 or 100a. It can be understood from FIG. 5 that when the overlap ratio is less than or equal to 15%, the uniform bright area 60 has high light uniformity. Furthermore, it can be understood from FIG. 6 that when the overlap ratio is less than or equal to 20%, the lighting device 100 or 100a has high efficiency. It can also be understood from FIGS. 5 and 6 that when the overlap ratio is less than 30%, light uniformity and efficiency are good.

在根據本發明實施例的照明裝置中，繞射區域分別與多個點光源對準，並且分別將光從這些點光源繞射至待照明物體，使得繞射光學元件與光源陣列之間的間距可被減少。因此，根據本發明實施例的照明裝置可以具有較小的體積。In the lighting device according to the embodiment of the present invention, the diffractive regions are respectively aligned with a plurality of point light sources, and the light is respectively diffracted from the point light sources to the object to be illuminated, so that the distance between the diffractive optical element and the light source array is Can be reduced. Therefore, the lighting device according to the embodiment of the present invention can have a smaller volume.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

50‧‧‧待照明物體
60‧‧‧均勻明亮區域
100、100a‧‧‧照明裝置
110‧‧‧光源陣列
112‧‧‧點光源
113‧‧‧光
120‧‧‧繞射光學元件
A‧‧‧繞射區域
D‧‧‧外徑
L‧‧‧間距
N‧‧‧參考線
P‧‧‧節距
R‧‧‧區域
S‧‧‧擴張寬度
V‧‧‧重疊寬度
θ‧‧‧發散角 50‧‧‧ objects to be illuminated
60‧‧‧ Uniform bright area
100, 100a‧‧‧lighting device
110‧‧‧light source array
112‧‧‧point light source
113‧‧‧light
120‧‧‧ Diffractive Optical Element
A‧‧‧ Diffraction area
D‧‧‧ outer diameter
L‧‧‧ pitch
N‧‧‧ Reference line
P‧‧‧ pitch
R‧‧‧ area
S‧‧‧Expansion width
V‧‧‧ overlapping width θ‧‧‧ divergence angle

圖1是根據本發明的實施例的照明裝置的示意性剖面圖。
圖2A是圖1中的光源陣列的示意性上視圖。
圖2B和2C是根據本發明的兩個實施例，圖1中區域R的放大圖。
圖3示出了由圖1中的照明裝置所照明的待照明物體上的均勻明亮區域。
圖4是根據本發明另一實施例的照明裝置的示意性剖面圖。
圖5是根據圖1與4的實施例的照明裝置的待照明物體上的均勻明亮區域的不均勻性相對於重疊率的折線圖。
圖6是根據圖1與4的實施例的照明裝置的效率相對於重疊率的折線圖。 FIG. 1 is a schematic sectional view of a lighting device according to an embodiment of the present invention.
FIG. 2A is a schematic top view of the light source array in FIG. 1.
2B and 2C are enlarged views of a region R in FIG. 1 according to two embodiments of the present invention.
FIG. 3 shows a uniformly bright area on an object to be illuminated illuminated by the lighting device in FIG. 1.
FIG. 4 is a schematic sectional view of a lighting device according to another embodiment of the present invention.
5 is a line chart of the unevenness of the uniform bright area on the object to be illuminated of the lighting device according to the embodiment of FIGS. 1 and 4 with respect to the overlap ratio.
FIG. 6 is a line chart of the efficiency of the lighting device according to the embodiment of FIGS. 1 and 4 versus the overlap ratio.

Claims

一種照明裝置，包括：一光源陣列，包括：多個點光源，以一陣列排列；以及一繞射光學元件，包括：多個繞射區域，分別與該些點光源對準，其中該些繞射區域分別將光從該些點光源繞射至一待照明物體，用以重疊光，以在該待照明物體上形成一均勻明亮區域，其中該照明裝置符合：L=[E‧P/2+(P/2-D/2)]/tan(θ/2)及0≦E≦0.5，其中L為該光源陣列與該繞射光學元件之間的間距，E為係數，P為該些點光源的節距，D為每一點光源的外徑，θ為每一光的發散角。。A lighting device includes: a light source array including: a plurality of point light sources arranged in an array; and a diffractive optical element including: a plurality of diffractive regions respectively aligned with the point light sources, wherein The irradiating areas respectively diffract light from the point light sources to an object to be illuminated for overlapping light to form a uniform and bright area on the object to be illuminated. The lighting device conforms to: L = [E‧P / 2 + (P / 2-D / 2)] / tan (θ / 2) and 0 ≦ E ≦ 0.5, where L is the distance between the light source array and the diffractive optical element, E is the coefficient, and P is the number The pitch of point light sources, D is the outer diameter of each point light source, and θ is the divergence angle of each light. .

如申請專利範圍第1項所述的照明裝置，其中該光源陣列為雷射光源陣列。The lighting device according to item 1 of the patent application scope, wherein the light source array is a laser light source array.

如申請專利範圍第2項所述的照明裝置，其中該光源陣列為垂直共振腔面射型雷射。The lighting device according to item 2 of the scope of patent application, wherein the light source array is a vertical cavity surface emitting laser.

如申請專利範圍第1項所述的照明裝置，其中E=V/P，V為由沿著連接兩個相鄰的點光源的參考線上的該兩個相鄰的點光源所分別發射的兩個相鄰的光所分別照明的兩個區域的重疊寬度。The lighting device according to item 1 of the scope of patent application, wherein E = V / P, V is two light emitted by the two adjacent point light sources along the reference line connecting two adjacent point light sources, respectively. The overlapping width of two areas illuminated by two adjacent lights, respectively.

如申請專利範圍第1項所述的照明裝置，其中該照明裝置符合：0≦V/P≦0.5，其中V為在該繞射光學元件上由沿著連接兩個相鄰的點光源的參考線上的該兩個相鄰的點光源所分別發射的兩個相鄰的光所分別照明的兩個區域的重疊寬度，且P為該些點光源的節距。The lighting device according to item 1 of the patent application scope, wherein the lighting device meets: 0 ≦ V / P ≦ 0.5, where V is a reference on the diffractive optical element by connecting two adjacent point light sources along The overlapping widths of the two areas respectively illuminated by the two adjacent light sources emitted by the two adjacent point light sources on the line, and P is the pitch of the point light sources.

如申請專利範圍第1項所述的照明裝置，其中該光源陣列與該繞射光學元件之間的間距小於或等於0.1毫米。The lighting device according to item 1 of the application, wherein a distance between the light source array and the diffractive optical element is less than or equal to 0.1 mm.

如申請專利範圍第1項所述的照明裝置，其中該些點光源為雷射二極體。The lighting device according to item 1 of the scope of patent application, wherein the point light sources are laser diodes.