Light source device and head-up display

Abstract

To provide a light source device and a headup display that can be downsized and can realize a uniform illumination.SOLUTION: The present invention includes: a first light source (11); a second light source (12); illumination units (14, 15) irradiated with first exit light from the first light source (11) and second exit light from the second light source (12); and at least one of a light collection unit arranged between the first light source (11) and the irradiation units (14, 15) for collecting the first exit light and a diffusion unit (D1) arranged between the second light source (12) and the irradiation units (14, 15) for diffusing the second exit light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light source device and a head-up display. [Background technology]

[0002] BACKGROUND ART One field of light source devices is a light source device that illuminates a liquid crystal display from the back, known as a backlight. Patent Document 1, for example, is known as a document disclosing such a light source device.

[0003] The light source device disclosed in Patent Document 1 is a light source device that illuminates a liquid crystal display used in a head-up display (hereinafter referred to as "HUD") from the back, and is equipped with a light source unit in which a plurality of first light source elements that emit white light and a plurality of second light source elements that emit red light are arranged in a predetermined direction, a first lens that converts the light emitted from the light source unit into parallel light, and a second lens that deflects the light emitted from the first lens so that it is irradiated onto a diffusion plate that serves as an illumination area and is provided on the back of the liquid crystal display.

[0004] Patent document 1 describes that with the light source device having the above configuration, the first lens illuminates the liquid crystal display so that light emitted from a plurality of light source elements having two different emission colors overlaps in a predetermined area on the incident surface of the liquid crystal display, thereby enabling a specific color to be efficiently displayed with high brightness in an image displayed on the liquid crystal display. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-164285 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, light source devices for LCD displays are required to be able to ensure the necessary brightness (generally relatively high brightness) and to illuminate the entire LCD display uniformly. Uniform illumination here refers to illumination that suppresses not only uneven illumination but also uneven color. When used in HUDs and other applications, they are also required to be even smaller due to installation space limitations.

[0007] In this respect, the light source device disclosed in Patent Document 1 also aims to achieve high brightness. However, in the light source device disclosed in Patent Document 1, each of the emitted light from the first light source element and each of the emitted light from the second light source element is configured to illuminate the entire illumination area relatively uniformly. Therefore, due to restrictions imposed by the optical system, it is difficult to shorten the distance between the light source element and the first lens, the distance between the first lens and the second lens, and the distance between the second lens and the illuminated object. This limits the miniaturization of the light source device disclosed in Patent Document 1. Furthermore, the configuration of the light source device disclosed in Patent Document 1 tends to reduce the utilization efficiency of the luminous flux.

[0008] SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned conventional problems, and has an object to provide a light source device and a head-up display that can be made compact and that achieve uniform illumination. [Means for solving the problem]

[0009] In order to solve the above problem, the light source device of the present invention comprises: a first light source; and Second Light Source are arranged alternately, and the number of the first light sources is greater than the number of the second light sources; The light source is characterized by comprising at least one of an irradiation unit that is irradiated with a first emitted light from the first light source and a second emitted light from the second light source, a focusing unit that is disposed between the first light source and the irradiation unit and focuses the first emitted light, and a diffusion unit that is disposed between the second light source and the irradiation unit and diffuses the second emitted light.

[0010] In such a light source device of the present invention, the light flux corresponding to each of the first light source and the second light source can be controlled by at least one of the focusing section that focuses the first emitted light and the diffusing section that diffuses the second emitted light, so that the illumination light can be uniformly irradiated onto the object.

[0011] In one aspect of the present invention, a light-shielding portion is further provided around at least one of the light-collecting portion and the light-diffusing portion.

[0012] In one aspect of the present invention, the light emitting device further includes a scattering section around the diffusion section.

[0013] In one aspect of the present invention, the first light source and the second light source have different colors.

[0014] In addition, in one aspect of the present invention, the irradiation unit is characterized in that it includes a first optical means that controls the first emitted light and the second emitted light, or it includes the first optical means and a second optical means that is arranged between the first optical means and the object and controls the emitted light from the first optical means.

[0015] In order to solve the above problem, a head-up display of the present invention is characterized by including any one of the light source devices described above and a projection unit that projects light emitted from the light source device. [Effects of the Invention]

[0016] The present invention can provide a light source device and a head-up display that can be miniaturized and achieve uniform illumination. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a light source device according to a first embodiment; FIG. 2 is a schematic plan view showing an illumination pattern by a first light-emitting element in an illumination area; and FIG. 3 is a schematic plan view showing an illumination pattern by a second light-emitting element in an illumination area. [Figure 2] FIG. 4 is a schematic cross-sectional view showing an example of a light source device according to a modified example of the first embodiment. [Figure 3] FIG. 10 is a schematic cross-sectional view showing an example of the configuration of a light source device according to a second embodiment. [Figure 4] FIG. 10 is a schematic cross-sectional view showing an example of the configuration of a light source device according to a third embodiment. [Figure 5] 10(a) and 10(b) are schematic cross-sectional views showing an example of the configuration of a light source device according to a fourth embodiment. [Figure 6] 10(a) to 10(c) are schematic cross-sectional views showing an example of the configuration of a light source device according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be assigned the same reference numerals, and redundant explanations will be omitted where appropriate. In the following explanation, a light source device according to the present invention will be described as an example in which the light source device is applied to a light source device that illuminates a liquid crystal display used in a HUD from the back.

[0019] (First embodiment) <Light source device> A light source device 10 according to this embodiment will be described with reference to Fig. 1. As shown in Fig. 1(a), the light source device 10 includes first light-emitting elements 11-1, 11-2, and 11-3 (hereinafter collectively referred to as "first light-emitting elements 11"), second light-emitting elements 12-1 and 12-2 (hereinafter collectively referred to as "second light-emitting elements 12"), a first lens 14, a second lens 15, and a diffusion section D1. Fig. 1 also illustrates a liquid crystal display, which is an example of an object 50 to be illuminated, and the object 50 (liquid crystal display) includes a liquid crystal display section 17 and a diffusion sheet 16.

[0020] The liquid crystal display unit 17 is a transmissive spatial modulation element that receives a modulation signal and spatially modulates the irradiated light, displaying an image according to the modulation signal. The diffusion sheet 16 diffuses the highly directional light deflected by the first lens 14 and the second lens 15 and outputs it to the liquid crystal display unit 17, thereby making the liquid crystal display unit 17 more uniformly illuminated.

[0021] The first light-emitting elements 11 are semiconductor light-emitting elements such as LEDs (Light Emitting Diodes), and are arranged in a predetermined direction (the horizontal direction of the paper in the example of FIG. 1). The light color of the first light-emitting elements 11 is not particularly limited, but in this embodiment, white light is used as an example. Note that in this embodiment, the number of first light-emitting elements 11 arranged is one row, but two or more rows may also be used. Furthermore, the first light-emitting elements 11 are not limited to LEDs, and may be semiconductor lasers or the like.

[0022] The second light-emitting elements 12 are semiconductor light-emitting elements such as LEDs, and are alternately arranged between the first light-emitting elements 11 in a predetermined direction (the horizontal direction in the example of FIG. 1). The color of light emitted by the second light-emitting elements 12 is not particularly limited, but in this embodiment, blue light is used as an example. That is, in this embodiment, the liquid crystal display unit 17 is basically illuminated with white light from the first light-emitting elements 11, and blue light from the second light-emitting elements 12 is added as a correction color. The correction color is used, for example, to reinforce a color with low transmittance in the liquid crystal display unit 17, which is part of the object 50. However, the reason for using the correction color is not limited to this, and it may be used for various reasons, such as using a synthesized color or adjusting a color tone.

[0023] In this embodiment, the number of second light-emitting elements 12 arranged is one row, but it may be two or more rows in accordance with the number of first light-emitting elements 11. Furthermore, the second light-emitting elements 12 are not limited to LEDs, and may be semiconductor lasers or the like. The "first light-emitting element 11" and the "second light-emitting element 12" are examples of the "first light source" and the "second light source" according to the present invention, respectively.

[0024] The first lens 14 and the second lens 15 together have the function of guiding the light emitted from the first light-emitting element 11 and the second light-emitting element 12 to the illumination area As of the object 50 (see FIGS. 1(b) and 1(c)). In this embodiment, the illumination area As is, for example, the rear surface of the diffusion sheet 16 (the surface on the side of the first light-emitting element 11 and the second light-emitting element 12). However, the location of the illumination area As can be determined taking into consideration the specifications of the light source device, etc., and may be, for example, the rear surface of the liquid crystal display unit 17. In the following description, the first lens 14 and the second lens 15 may be referred to as the "first common lens" and the "second common lens," respectively.

[0025] The first lens 14 has a function of collecting the light emitted from the first light-emitting element 11 and the second light-emitting element 12, which have a relatively large directivity angle (the angle at which the emitted light from the LED spreads), and emitting the light as, for example, parallel light or a light beam close to parallel light (hereinafter, both will be collectively referred to as "approximately parallel light"). The first lens 14 may be, for example, a lens having positive power, and its shape is not particularly limited. However, the positive and negative power of the first lens 14 should be determined depending on the directivity angle of the emitted light from the first light-emitting element 11 and the second light-emitting element 12, and is not limited to one side. In this embodiment, a plano-convex lens is used as an example of the first lens 14.

[0026] The second lens 15 controls the light flux so that, for example, substantially parallel light emitted from the first lens 14 uniformly illuminates the entire illumination area As. Therefore, the shape and positive / negative power of the second lens 15 are selected to suit this purpose. In this embodiment, a plano-convex lens is used as an example of the second lens 15. Here, in this embodiment, an example in which the second lens 15 is disposed in addition to the first lens 14 is described. However, if the divided illumination described below can be achieved using only the first lens 14, the second lens 15 may be omitted. The "first lens 14" and the "second lens 15" are examples of the "first optical means" and the "second optical means," respectively, according to the present invention. Furthermore, the "first lens 14" alone, or the "first lens 14" and the "second lens 15" are examples of the "illumination unit" according to the present invention. The first lens 14 and the second lens 15 are formed of, for example, a resin such as acrylic resin, or glass.

[0027] The diffusion section D1 is provided between each of the second light-emitting elements 12-1 and 12-2 and the first lens 14. The diffusion section D1 has a function of diffusing the light emitted from the second light-emitting element 12. The diffusion section D1 will be described in detail later.

[0028] As described above, a light source device for a liquid crystal display is required to have high brightness and uniform illumination capability as well as compactness. Therefore, in this embodiment, three illumination patterns based on the first emitted light from each of the three first light-emitting elements 11 are configured to divide and illuminate the entire illumination area As (hereinafter referred to as "divided illumination"), and two illumination patterns based on the second emitted light from each of the two second light-emitting elements 12 are configured to divide and illuminate the entire illumination area As.

[0029] The divided illumination will be described in more detail with reference to Figures 1(b) and 1(c). Figure 1(b) shows an example of an illumination pattern (divided illumination) by the first light-emitting element 11, and Figure 1(c) shows an example of an illumination pattern (divided illumination) by the second light-emitting element 12. Figures 1(b) and 1(c) show the illumination pattern on the back surface of the diffusion sheet 16, which forms the illumination area As.

[0030] As shown in FIG. 1(b), the illumination area As is divided and illuminated by three illumination patterns A111, A112, and A113. That is, illumination pattern A111 represents the illumination pattern of the first light-emitting element 11-1, illumination pattern A112 represents the illumination pattern of the first light-emitting element 11-2, and illumination pattern A113 represents the illumination pattern of the first light-emitting element 11-3. The illumination patterns A111, A112, and A113 are closely spaced to uniformly illuminate the illumination area As as a whole. However, it is essential that the illumination patterns A111, A112, and A113 are spaced apart from one another without any gaps, and slight overlap is permitted. To more reliably suppress the gaps by allowing slight overlap, defocusing may be used, for example, by adjusting the positions of optical elements such as the first lens 14 and the second lens 15.

[0031] As shown in FIG. 1(c), the illumination area As is divided and illuminated by two illumination patterns A121 and A122. That is, the illumination pattern A121 indicates an illumination pattern by the second light-emitting element 12-1, and the illumination pattern A122 indicates an illumination pattern by the second light-emitting element 12-2. The illumination patterns A121 and A122 are closely spaced from each other, uniformly illuminating the illumination area As as a whole. However, it is essential that the illumination patterns A121 and A122 are spaced from each other without any gaps, and slight overlap is permitted. As described above, in the light source device 10 according to this embodiment, the illumination area As is illuminated by illumination that combines the divided illumination by the first light-emitting element 11 and the divided illumination by the second light-emitting element 12.

[0032] Here, when divided illumination is employed as in this embodiment, it is necessary to control the light flux emitted from the first light-emitting element 11 or the light flux emitted from the second light-emitting element 12. That is, in this embodiment, the directivity angle of light emitted from the light-emitting surface of the first light-emitting element 11 is set to be equal to the directivity angle of light emitted from the light-emitting surface of the second light-emitting element 12. In this state, simply arranging the first lens 14 and the second lens 15 does not result in optimal divided illumination for each of the first light-emitting element 11 and the second light-emitting element 12. This is because different numbers of light-emitting elements result in different illumination patterns in the illumination area As. For example, if the first lens 14 and the second lens 15 are arranged to form an illumination pattern for the first light-emitting element 11, gaps will appear in the illumination pattern for the second light-emitting element 12.

[0033] To address the above-described phenomenon, the present embodiment provides a diffusion section D1. Specifically, the diffusion section D1 provided above each of the light-emitting surfaces of the second light-emitting elements 12-1 and 12-2 acts to spread the luminous flux of the light emitted from the second light-emitting elements 12-1 and 12-2 and fill the gaps. This results in illumination patterns A121 and A122, as shown in FIG. 1(c), that illuminate the entire illumination area As without any gaps. As a result, the light source device 10 according to this embodiment can reduce at least one of the distances between the first and second light-emitting elements 11 and 12 and the first lens 14, the distance between the first lens 14 and the second lens 15, and the distance between the second lens 15 and the object 50 (hereinafter sometimes referred to as the "optical length"). This reduces the vertical length of the light source device 10 (the traveling direction of the light emitted from the first and second light-emitting elements 11 and 12), thereby achieving a compact light source device 10. Whether to shorten the distance between the first light-emitting element 11 and the second light-emitting element 12 and the first lens 14, the distance between the first lens 14 and the second lens 15, or the distance between the second lens 15 and the object 50 is selected depending on the specific design conditions of the light source device 10, etc.

[0034] <Head-up display> Next, a head-up display according to this embodiment will be described. In the head-up display (HUD) according to this embodiment, an HUD unit is stored in, for example, the dashboard of a vehicle, and an image from the HUD unit is displayed by being projected onto, for example, the windshield of the vehicle. The HUD unit is a unit that reflects an image light source, typically a liquid crystal display, with a flat mirror and enlarges it with a concave mirror, etc., and the generated image is reflected by the windshield and guided to the driver's eyes, where it is visible.

[0035] The HUD according to this embodiment includes a light source device 10, an object 50 (liquid crystal display), and a projection unit (not shown). The projection unit includes, for example, the above-mentioned flat mirror, concave mirror, and windshield. An image is displayed by projecting light emitted from the object 50 by the projection unit. Because the head-up display according to this embodiment uses the light source device 10, it can be configured compactly and can generate a uniform image.

[0036] As described above in detail, the light source device and head-up display according to this embodiment can provide a light source device and head-up display that can be miniaturized and achieves uniform illumination.

[0037] <Modification of the first embodiment> A light source device 10A according to this embodiment will be described with reference to Fig. 2. The light source device 10A has a configuration in which the second lens 15 in the light source device 10 according to the above embodiment is replaced with a lens of another type. Therefore, the other configurations are the same as those of the light source device 10, and detailed description thereof will be omitted and reference will be made to Fig. 1 when necessary.

[0038] While the first common lens is selected from the viewpoint of its light beam shaping function, the second common lens may be selected from the viewpoint of the uniformity of the illumination pattern and the efficiency of light beam utilization rather than the light beam shaping function. From this viewpoint, in this embodiment, a lenticular lens 18 is used as the second lens. By using the lenticular lens 18, the light rays are convoluted and diffused, resulting in the light rays being mixed, further improving the uniformity of the illumination pattern and the efficiency of light beam utilization. Furthermore, the lenticular lens 18 can be formed thin, which contributes to further miniaturization. Note that the second common lens used in this embodiment is not limited to the lenticular lens 18, and a Fresnel lens or the like may also be used. In this case, the same effect as that of the lenticular lens 18 can be obtained.

[0039] (Second embodiment) A light source device 10B according to this embodiment will be described with reference to Fig. 3. The light source device 10B is a configuration in which the diffusing section D1 in the light source device 10 according to the above embodiment is replaced with a light collecting section C1. Therefore, the other configurations are the same as those of the light source device 10, and detailed description thereof will be omitted and reference will be made to Fig. 1 if necessary.

[0040] 3, light source device 10B has a condensing section C1 on the light emission surface of first light-emitting element 11. In light source device 10, diffusing section D1 diffuses the light flux emitted from second light-emitting element 12, so that each of the light emitted from first light-emitting element 11 and second light-emitting element 12 can form an appropriate illumination pattern in illumination area As. In contrast, this embodiment does not control the light flux of the light emitted from second light-emitting element 12, but condenses the light emitted from first light-emitting element 11, so that each of the light emitted from first light-emitting element 11 and second light-emitting element 12 can form an appropriate illumination pattern in illumination area As.

[0041] More specifically, as an example, first, the first lens 14 and the second lens 15 are positioned so that the light emitted from the second light-emitting elements 12-1 and 12-2 forms illumination patterns A121 and A122 (see FIG. 1(c)). Then, under these conditions, the light-collecting unit C1 is selected and positioned so that the first light-emitting elements 11-1, 11-2, and 11-3 form illumination patterns A111, A112, and A113. This is because, if the first lens 14 and the second lens 15 are optimally positioned with respect to the second light-emitting element 12, there may be excessive overlap between the illumination patterns A111, A112, and A113 from the first light-emitting elements 11-1, 11-2, and 11-3.

[0042] Thus, the light source device 10B according to this embodiment also makes it possible to provide a light source device and a head-up display that can be miniaturized and achieve uniform illumination. Furthermore, according to the above-described embodiment and this embodiment, it is possible to flexibly select a control means for the light flux from the first light-emitting element 11 and the second light-emitting element 12. Generally, the light-collecting unit C1 is used for the first light-emitting element 11 or the second light-emitting element 12, whichever is more numerous, and the diffusion unit D1 is used for the light-emitting element with the fewer number. Of course, either the light-collecting unit C1 or the diffusion unit D1 may be used. Furthermore, whether to use the diffusion unit D1 or the light-collecting unit C1 may be determined, for example, based on the condition that the diffusion unit D1 is selected based on the number of light-collecting units to be arranged.

[0043] (Third embodiment) A light source device 10C according to this embodiment will be described with reference to Fig. 4. The light source device 10C is a configuration in which the diffusing section D1 and the light collecting section C1 of the light source devices 10 and 10B according to the above embodiments are integrated. Therefore, the other configurations are the same as those of the light source device 10, and detailed description thereof will be omitted and reference will be made to Fig. 1 if necessary.

[0044] 4, the light source device 10C includes a light-collecting portion C2 disposed on the light-emitting surface of the first light-emitting element 11 and a diffusion portion D2 disposed on the light-emitting surface of the second light-emitting element 12. The functions of the light-collecting portion C2 and the diffusion portion D2 are as described above. The three light-collecting portions C2 are designed so that the first light-emitting elements 11-1, 11-2, and 11-3 form illumination patterns A111, A112, and A113 (see FIG. 1(b)), respectively, and the two diffusion portions D2 are designed so that the second light-emitting elements 12-1 and 12-2 form illumination patterns A121 and A122 (see FIG. 1(c)), respectively.

[0045] In the light source device 10C according to this embodiment, three light collecting portions C2 and two diffusing portions D2 are integrally formed as shown in FIG. 4. The optical member in which the light collecting portions C2 and the diffusing portions D2 are integrated can be manufactured by, for example, integral molding using resin. In addition to the effects of the light source device 10, the light source device 10C according to this embodiment has the effect of simplifying the alignment of the optical members including the first light-emitting element 11, the second light-emitting element 12, the light collecting portions C2, the diffusing portions D2, the first lens 14, and the second lens 15.

[0046] (Fourth embodiment) Light source devices 10D and 10E according to this embodiment will be described with reference to Fig. 5. Light source devices 10D and 10E are configured by integrating the diffusing section D1 or the condensing section C1 of light source devices 10 and 10B according to the above embodiments with the first lens 14. Therefore, other configurations are the same as those of light source device 10, and detailed description thereof will be omitted and reference will be made to Fig. 1 if necessary.

[0047] As shown in Fig. 5(a), the light source device 10D includes a first lens 14A. The first lens 14A has three light-collecting portions C3 formed on a flat portion P, and each of the three light-collecting portions C3 has a plano-convex lens shape. However, the shape of the light-collecting portions C3 is not limited to a plano-convex lens shape and may be, for example, a convex lens shape. Each of the three light-collecting portions C3 is disposed on the light-emitting surface of each of the three first light-emitting elements 11, and together with the action of the second lens 15, forms illumination patterns A111, A112, and A113 (see Fig. 1(b)) in the illumination area As.

[0048] Unlike the first light-emitting element 11, the second light-emitting element 12 does not have a lens function in the area of ​​the first lens 14A corresponding to the light emission surface of the second light-emitting element 12. That is, the light emitted from the second light-emitting element 12 passes through the flat plate portion P and forms illumination patterns A121 and A122 (see FIG. 1(c)) by the action of the second lens 15. According to the light source device 10D, the light-collecting portion C3 and the first common lens are integrated, thereby further shortening the optical length.

[0049] As shown in Fig. 5(b), the light source device 10E includes a first lens 14B. Two diffusion sections D3 are formed on the incident surface (the surface facing the second light-emitting elements 12) of the first lens 14B, and the lower surfaces of the two diffusion sections D3 are concave and the upper surfaces are linear. Each of the two diffusion sections D3 is disposed on the light-emitting surfaces of the two second light-emitting elements 12, and together with the action of the second lens 15, they form illumination patterns A121 and A122 (see Fig. 1(c)) in the illumination area As.

[0050] Since the first light-emitting element 11 is directly opposed to the incident surface of the first lens 14B, the light emitted from the first light-emitting element 11 forms illumination patterns A111, A112, and A113 (see FIG. 1(b)) due to the action of the first lens 14B as a plano-convex lens and the second lens 15. According to the light source device 10E, the diffusion section D3 and the first common lens are integrated, so the optical length can be further shortened.

[0051] As described above, the light source devices 10D and 10E according to this embodiment not only have the effect of the light source device 10, but also have the effect of being more compact.

[0052] (Fifth embodiment) Light source devices 10F, 10G, and 10H according to this embodiment will be described with reference to Fig. 6. In this embodiment, a light-shielding portion or a scattering portion is provided in the light-collecting portion or the light-diffusing portion of each of the above-described embodiments. Therefore, the other configurations are the same as those of light source device 10, and detailed description thereof will be omitted and reference will be made to Fig. 1 if necessary.

[0053] As shown in Fig. 6(a), the light source device 10F includes a first lens 14C that integrates a light-collecting portion C4 and a diffusion portion D4. The light-collecting portion C4 is disposed on the light-emitting surface of the first light-emitting element 11, and the diffusion portion D4 is disposed on the light-emitting surface of the second light-emitting element 12. The first lens 14C and the second lens 15 act to form the divided illumination shown in Figs. 1(b) and 1(c).

[0054] Here, the light emitted from an LED generally has a wide directivity angle, which can lead to crosstalk between adjacent LEDs, resulting in stray light. Stray light causes color and illumination unevenness in the illumination area As, and must be suppressed as much as possible. Therefore, the light source device 10F is provided with a light-shielding portion 19 to suppress this stray light. As shown in FIG. 6(a), the light-shielding portion 19 is disposed near both ends of the light-concentrating portion C4 and the diffusing portion D4. This blocks light with a wide directivity angle emitted from the first light-emitting element 11 and the second light-emitting element 12. As a result, the light source device 10F can more effectively suppress color and illumination unevenness in the illumination area As.

[0055] As shown in Fig. 6(b), the light source device 10G includes a first lens 14D integrated with a diffusion portion D5. The diffusion portion D5 is disposed on the light output surface of the second light-emitting element 12, and the first light-emitting element 11 directly faces the light input surface of the first lens 14D. The action of the first lens 14D and the second lens 15 forms the divided illumination shown in Figs. 1(b) and 1(c).

[0056] In light source device 10G, a light-shielding portion 19A is formed around diffusion portion D5. Light-shielding portion 19A has the function of suppressing stray light, similar to light-shielding portion 19. Since light-shielding portion 19A is integrated with diffusion portion D5, alignment with diffusion portion D5, second light-emitting element 12, etc. is not required, which has the effect of making assembly easier.

[0057] As shown in Fig. 6(c), light source device 10H includes first lens 14E with integrated diffusion portion D6. Diffusion portion D6 is disposed on the light-emitting surface of second light-emitting element 12, and first light-emitting element 11 directly faces first lens 14E. The action of first lens 14E and second lens 15 forms the divided illumination shown in Figs. 1(b) and 1(c).

[0058] In the light source device 10H, a scattering portion 20 is formed around the diffusing portion D6. The scattering portion 20 is formed by fine irregularities, a rough surface, a textured finish, or the like, and has the effect of scattering light with a large directivity angle incident from the second light-emitting element 12. That is, while the light source device 10G blocks stray light using the light-shielding portion 19A, the light source device 10H scatters the stray light, thereby reducing the influence of stray light in the illumination patterns shown in FIGS. 1(b) and 1(c), and realizing a uniform illumination pattern. The scattering portion 20 has the effect of further improving the utilization efficiency of the luminous flux. Furthermore, because the scattering portion 20 is integrated with the diffusing portion D6, alignment with the diffusing portion D6, the second light-emitting element 12, etc. is not required, which has the effect of simplifying assembly.

[0059] As described above, the light source devices 10F, 10G, and 10H according to this embodiment not only have the effect of the light source device 10, but also have the effect of more effectively suppressing color unevenness and illumination unevenness in the illumination area As.

[0060] Here, in the present embodiment, a configuration in which a light-shielding portion or a scattering portion is provided has been described as an example, but the present invention is not limited to this, and both may be used in combination. That is, for example, a configuration in which a light-shielding portion is provided on the first light-emitting element 11 side and a scattering portion is provided on the second light-emitting element 12 side may be used.

[0061] In addition, means for suppressing stray light are not limited to those described above; other means include applying a light-absorbing material to part of the optical components (light-collecting section, diffusing section, first common lens, second common lens, etc.), or making the shape of the incident surface of the optical components as continuous and smooth as possible.

[0062] In this embodiment, an example is described in which there are three first light-emitting elements 11 and two second light-emitting elements 12, but the number of each light-emitting element is not limited to this, as long as there is one or more of each.

[0063] Furthermore, in each of the above embodiments, the diffusing portion and the condensing portion are arranged as part of the optical system, but the present invention is not limited to this. For example, the diffusing portion and the condensing portion may be formed on the light emitting surface of the light emitting element.

[0064] Furthermore, in the above embodiments, the arrangements of the light collecting portion, the diffusing portion, the light blocking portion, the scattering portion, etc. are described individually, but these arrangements may be combined as appropriate. [Explanation of symbols]

[0065] 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H...Light source device 11, 11-1, 11-2, 11-3...first light-emitting element 12, 12-1, 12-2...second light-emitting element 14, 14A, 14B, 14C, 14D, 14E...First lens 15...Second lens 16...Diffusion sheet 17...Liquid crystal display section 18...Lenticular lens 19, 19A…shading part 20...Scatter part 50...Object As...Lighting area C1, C2, C3, C4...Condenser section D1, D2, D3, D4, D5, D6...Diffusion section P…flat plate part

Claims

1. a plurality of first light sources and a plurality of second light sources are alternately arranged, and the number of the first light sources is greater than the number of the second light sources; an irradiation unit that irradiates the first emitted light from the first light source and the second emitted light from the second light source; A light source device comprising at least one of a focusing section disposed between the first light source and the irradiation section for focusing the first emitted light, and a diffusion section disposed between the second light source and the irradiation section for diffusing the second emitted light.

2. The light source device according to claim 1 , The light source device further comprises a light blocking portion around at least one of the light collecting portion and the light diffusing portion.

3. The light source device according to claim 1 , The light source device further comprises a scattering section around the diffusion section.

4. 4. The light source device according to claim 1, A light source device, characterized in that the first light source and the second light source have different colors.

5. 5. The light source device according to claim 1, The light source device is characterized in that the irradiation unit includes a first optical means that controls the first emitted light and the second emitted light, or includes the first optical means and a second optical means that is arranged between the first optical means and an object and controls the emitted light from the first optical means.

6. A light source device according to any one of claims 1 to 5; a projection unit that projects the light emitted from the light source device.

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