JP2017188298A - Light source device and electronic apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which is small in size and can be manufactured at low cost, and is suitable as a light source for lighting of a display device of an electronic device such as a HUD or an ultra-small projector. A light source device incidents a solid-state light source, a collimating optical system that converts light emitted from the solid-state light source into substantially parallel light, and light emitted from a collimating optical system, and directs the light in a direction different from the incident direction. It is provided with a light guide body that emits light. The light guide has an incident portion that incidents light, a reflecting portion that reflects the incident light, and an emitting portion that emits the light reflected by the reflecting portion, and the reflecting portion reflects the incident light. It is composed of a plurality of reflecting surfaces and a plurality of connecting surfaces connecting the plurality of reflecting surfaces, and the incident portion emits light in a direction in which the incident angle of the light incident on the reflecting surface of the reflecting portion becomes larger. It has a deflecting effect. [Selection diagram] Fig. 4

Description

  The present invention relates to a light source device that can be used as a planar light source, and more particularly to a planar light source device that is suitable for use in an electronic apparatus equipped with an image display device aimed at miniaturization.

  As a light source for illumination of a display device of a head up display (hereinafter referred to as “HUD”) or a micro projector, a compact and highly efficient light source device is desired.

  Conventionally, a light source device using a light guide body in which a predetermined texture is formed on a transparent resin is already known from Patent Document 1 below in order to realize a small and highly efficient light source device. The light guide illuminating device described in this patent document has a thin high-efficiency light source device by making light incident from the end of the light guide and scattering the incident light by the texture formed on the surface of the light guide. It is described that it can be realized.

JP 11-224518 A

  In recent years, it has been effective to use an LED as a light source of a light source device in accordance with an improvement in light emission efficiency of an LED that is a solid light source. However, in the optical system using the LED and the LED collimator that converts the light into substantially parallel light, the light utilization efficiency characteristic and the uniform illumination characteristic in the shape of the optical system disclosed in the above-described prior art (Patent Document 1). However, it was found to be insufficient.

  Therefore, in the present invention, specifically, the light utilization efficiency characteristics and uniform illumination characteristics of the laser light from the LED light source are further improved to achieve downsizing of the light source device and can be manufactured at low cost. An object of the present invention is to provide a light source device suitable as a light source for illumination in a display device of an electronic device such as an HUD or a micro projector, and to provide an electronic device including an image display device using the light source device. .

  As an embodiment for achieving the above object, according to the present invention, a solid light source, a collimating optical system that converts light emitted from the solid light source into substantially parallel light, and light emitted from the collimating optical system The light source device includes a light guide that enters the light and emits the light in a direction different from the incident direction. The light guide includes an incident portion that receives the light and a reflection that reflects the incident light. And an output part that emits the light reflected by the reflection part. The reflection part includes a plurality of reflection surfaces that reflect incident light and a plurality of connection surfaces that connect the plurality of reflection surfaces. The light source device having a structure in which the incident portion deflects light in a direction in which an incident angle of light incident on the reflection surface of the reflection portion becomes larger is provided.

  According to the invention, an electronic apparatus using the light source device as an image display device includes a HUD and a projector.

  According to the above-described present invention, it is possible to realize a light source device that can be manufactured at low cost, and that is small in size and highly efficient.

It is an expansion | deployment perspective view which shows the whole external view of the light source device which concerns on one Example of this invention. It is a perspective view which shows the external appearance of the internal structure of the optical system in the said light source device. It is a figure including the perspective view explaining the detail of the light guide in the said light source device, and a partially expanded cross section. It is a side view explaining the detail of operation | movement of the light guide in the said light source device. It is the upper surface and side view explaining the detail of operation | movement of the light guide in the said light source device. It is a figure which shows the comparative example for demonstrating operation | movement of the light guide in the said light source device. It is a perspective view explaining the detail of the collimator and synthetic | combination diffusion block in the said light source device. It is a partially expanded sectional view explaining the detail of the synthetic | combination diffusion block in the said light source device. It is a figure explaining the processing method of the metal mold | die used in order to shape | mold the light guide which is a component of the optical system of the said light source device. It is an external appearance perspective view which shows the whole general view of the light source device which is a modification of the light source device which concerns on one Example of this invention. It is a perspective view which shows the external appearance of the internal structure of the optical system of the light source device which is a modification of the light source device which concerns on one Example of this invention. It is an external appearance perspective view which shows the whole general view of the light source device which is the other modification of the light source device which concerns on one Example of this invention. It is a perspective view which shows another form of the collimator in the light source device which concerns on one Example of this invention, and the shape of a synthetic | combination diffusion block. It is a figure which shows the structure of HUD which utilized the light source device which concerns on one Example of this invention as the light source for illumination of the display device. It is a figure which shows the structure of the projector which utilized the light source device which concerns on one Example of this invention as the light source for illumination of the display device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing an overview of a light source device according to an embodiment of the present invention. As is apparent from the figure, the light source device (main body) 10 is formed of, for example, plastic, and houses therein an LED, a collimator, a synthetic diffusion block, a light guide, and the like which will be described in detail later. The light source device case 11 is configured. A liquid crystal display element 50 is attached to the upper surface, and an LED substrate 12 mounted with an LED (Light Emitting Diode) element that is a semiconductor light source and its control circuit is attached to one side face thereof. At the same time, a heat sink 13 for cooling the heat generated by the LED elements and the control circuit is attached to the outer surface of the LED board 12.

  Further, the liquid crystal display element 50 attached to the upper surface of the light source device case 11 includes a liquid crystal display panel frame 51, a liquid crystal display panel 52 attached to the frame, and an FPC (electrically connected to the panel). Flexible wiring board) 53. That is, the liquid crystal display panel 52 is controlled by a control signal from a control circuit (not shown here) constituting the electronic device, which will be described in detail later.

  FIG. 2 shows the configuration of the optical system housed in the light source device 10, that is, in the light source device case 11.

  A plurality of (four in this example) LEDs 14a to 14d (only two of LEDs 14a and 14b are shown in FIG. 2) constituting the light source are conically convex outer shapes obtained by rotating a substantially parabolic break. Are attached to the bottom of each LED collimator 15, and a rectangular composite diffusion block 16 is provided on the light emission side of the collimator. That is, the laser light emitted from the LED 14 a or 14 b is reflected by the parabola boundary surface of the LED collimator 15, and enters the composite diffusion block 16 as parallel light.

  Further, a bar-shaped light guide 17 having a substantially triangular cross section is provided on the exit surface side of the synthetic diffusion block 16 via a first diffusion plate 18a, and a second diffusion plate is provided on the upper surface thereof. 18b is attached. Thereby, the horizontal light of the LED collimator 15 is reflected upward in the figure by the action of the light guide 17 and guided to the incident surface of the liquid crystal display element 50. At that time, the first and second diffusion plates 18a and 18b make the strength uniform.

<Detailed structure of light guide>
Next, details of the light guide body 17 constituting the light source device 10 will be described below with reference to the drawings. 3A is a perspective view showing the entirety of the light guide 17, FIG. 3B is a cross section thereof, and FIGS. 3C and 3D are cross section details. It is a partially expanded sectional view shown.

  The light guide 17 is a member formed in a rod shape having a substantially triangular cross section (see FIG. 3B), for example, with a translucent resin such as acrylic, and is apparent from FIG. 3A. Furthermore, a light guide light incident part (surface) 171 that faces the exit surface of the composite diffusion block 16 via the first diffusion plate 18a, a light guide light reflection part (surface) 172 that forms a slope, A light guide light emitting portion (surface) 173 facing the liquid crystal display panel 52 of the liquid crystal display element 50 via the second diffusion plate 18b is provided.

  As shown in FIGS. 3C and 3D, which are partially enlarged views, the light guide body light reflecting portion (surface) 172 of the light guide body 17 includes a large number of reflecting surfaces 172a and connecting surfaces 172b. Are alternately formed in a sawtooth shape. And the reflective surface 172a (in the figure, a line segment rising to the right) forms αn (n: a natural number, for example, 1 to 130 in this example) with respect to the horizontal plane indicated by the alternate long and short dash line in the figure. As an example, αn is set to 52 degrees or less (however, 44 degrees or more).

  On the other hand, the connecting surface 172b (in the figure, a downward-sloping line segment) forms an angle βn (n: a natural number, for example, 1 to 130 in this example) with respect to the reflecting surface 172a. That is, the connecting surface 172b of the reflecting portion is inclined with respect to the incident light at an angle that becomes a shadow in the range of the half-value angle of the scatterer described later. As will be described in detail later, α1, α2, α3, α4,... Form the reflection surface elevation angle, and β1, β2, β3, β4,... Form the relative angle between the reflection surface and the connecting surface. , 90 degrees or more (however, 180 degrees or less). In this example, β1 = β2 = β3 = β4 = ... = β122 = ... β130.

  4 and 5 are schematic views in which the sizes of the reflecting surface 172a and the connecting surface 172b are relatively increased with respect to the light guide body 17 for the sake of explanation. In the light guide incident portion (surface) 171 of the light guide 17, the main light beam is deflected by δ in the direction in which the incident angle increases with respect to the reflection surface 172a (see FIG. 5B). That is, the light guide incident part (surface) 171 is formed in a curved convex shape inclined toward the light source side. According to this, the parallel light from the emission surface of the synthetic diffusion block 16 is diffused and incident through the first diffusion plate 18a, and as is clear from the drawing, the light guide incident portion (surface) 171. As a result, the light guide body light reflecting portion (surface) 172 is reached while slightly bending (deflecting) upward (see the comparative example in FIG. 6).

  In this light guide light reflecting portion (surface) 172, a large number of reflecting surfaces 172a and connecting surfaces 172b are alternately formed in a sawtooth shape, and diffused light is totally reflected on each reflecting surface 172a. Then, it goes upward, and further enters the liquid crystal display panel 52 as parallel diffused light via the light guide light emitting portion (surface) 173 and the second diffusion plate 18b. Therefore, the reflection surface elevation angles α1, α2, α3, α4,... Are set so that each reflection surface 172a has an angle greater than the critical angle with respect to the diffused light, and on the other hand, the reflection surface 172a and the connecting surface 172b. The relative angles β1, β2, β3, β4... Are constant angles as described above, the reason for which will be described later, but more preferably an angle of 90 degrees or more (βn ≧ 90 °). .

  With the above-described configuration, each reflecting surface 172a is configured to always have an angle greater than the critical angle with respect to the diffused light. Therefore, even if a reflecting film such as a metal is not formed on the reflecting portion 172, Reflection is possible, and a low-cost light source device can be realized. On the other hand, as shown in FIG. 6 as a comparative example, when there is no main light beam bending (polarization) at the light guide incident portion of the light guide 17, a part 31b of diffused light is reflected on the reflection surface 172a. As a result, the angle becomes below the critical angle, and a sufficient reflectance cannot be secured, so that a (bright) light source device with good characteristics cannot be realized.

  Further, the reflection surface elevation angles α1, α2, α3, α4... Are values that slightly increase as the light guide body light reflection portion (surface) 172 moves from the lower portion to the upper portion. This is because the light transmitted through the liquid crystal display panel 52 of the liquid crystal display element 50 has a certain divergence angle, and in particular, a part of the light transmitted through the peripheral portion of the liquid crystal display panel 52 is arranged downstream. This is to realize a configuration in which the light beam in the peripheral part is slightly deflected in the direction of the central axis as shown by the light beam 30 in FIG.

  As described above, β1 = β2 = β3 = β4... Βn ≧ 90 °. However, as shown in FIG. 9, this is because the mold 40 for producing the light guide 17 by injection molding is used. This is because, in the processing, the reflecting surface 172a and the connecting surface 172b can be processed simultaneously by the end mill 35 whose relative angle between the bottom surface and the side surface is β. Further, since the reflecting surface 172a and the connecting surface 172b can be processed with a relatively thick tool, the processing time can be greatly shortened, and the processing cost can be greatly reduced. In addition, the boundary edge between the reflecting surface 172a and the connecting surface 172b can be processed with high accuracy, and the light guide characteristics of the light guide 17 can be improved.

  In the figure, Lr1, Lr2, Lr3, Lr4... Represent the projection length of the reflecting surface 172a on the horizontal plane, and Lc1, Lc2, Lc3, Lc4... Represent the projection length of the connecting surface 172b on the horizontal plane. Thus, Lr / Lc, that is, the ratio of the reflecting surface 172a and the connecting surface 172b can be changed depending on the location. The intensity distribution of the main light beam 30 incident on the light guide 17 does not necessarily match the intensity distribution desired on the incident surface of the liquid crystal display panel. Therefore, a configuration is adopted in which the intensity distribution is adjusted by the ratio Lr / Lc between the reflecting surface 172a and the connecting surface 172b. In addition, the average intensity | strength of the reflected light of the part can be raised, so that this ratio is raised. Generally, the central portion of the light beam 30 incident on the light guide tends to be strong. Therefore, to correct it, the ratio Lr / Lc is different depending on the location, and in particular, the central portion is small. I made it. Since the ratio Lr / Lc differs depending on the location and the reflection surface elevation angles α1, α2, α3, α4... Differ depending on the location, an envelope 172c representing the general shape of the reflecting portion 172 is shown in FIG. The curve shape is shown as follows.

  Further, Lr1 + Lc1 = Lr2 + Lc2 = Lr3 + Lc3 = Lr4 + Lc4... = Lr + Lc ≦ 0.6 mm. By adopting such a configuration, the repetitive pitches of the reflecting surfaces viewed from the light exit surface 173 of the light guide 17 can be made the same. Further, since the pitch is 0.6 mm or less, coupled with the action and effect of the diffusion plates 18a and 18b, when viewed through the liquid crystal display panel 52, the individual emission surfaces are not separated and appear as continuous surfaces. For this reason, the spatial luminance over the liquid crystal display panel 52 can be made uniform, thereby improving the display characteristics. That is, this configuration makes it possible to make the incident light intensity distribution on the liquid crystal display panel 52 uniform. On the other hand, if the value of Lr + Lc is smaller than 0.2 mm, not only processing time is required, but it is difficult to process each reflecting surface 172a with high accuracy.

  Further, although not shown here, the above-mentioned value of Lr + Lc (the sum of lengths) is Lr1 + Lc1> Lr2 + Lc2> Lr3 + Lc3> Lr4 + Lc4... Or Lr1 + Lc1 = Lr2 + Lc2 = Lr3 + Lc3 = Lr4 + Lc4 ..... = Lr90 + Lc90> Lr91 + Lc91 = Lr92 + Lc92> Lr93 + Lc93 ...> Lr130 + Lc130 or Lr1 + Lc1 ≧ Lr2 + Lc2 ≧ Lr3 + Lc3 ≧ Lr4 + Lc4... Lr1 + Lc1> Lr130 + Lc130 may be adopted. By adopting such a configuration, the repetitive pitch of the reflecting surface 172a viewed from the exit surface 173 of the light guide 17 becomes finer as it approaches the exit surface 173. As a result, by this structure, the repetition pitch of the reflective surface 172a seen from the diffusion plate 18b of the light guide 17 becomes finer as it approaches the diffusion plate 18b. The repeating structure of the reflecting surface 172a increases the visibility and impairs the uniformity of the light intensity as it approaches the diffusion plate 18b. Therefore, the diffusion plate 18b needs to have a certain degree of diffusivity. Since the repetitive pitch of the reflecting surfaces arranged at positions close to 18b becomes fine, the uniformity of the light intensity can be ensured even if the diffusivity of the scattering plate is small, and the light utilization efficiency can be improved. Further, as described above, the value of Lr + Lc is desirably set within a range of 0.2 mm or more and 0.6 mm or less.

  According to the shape of the light guide light reflection part (surface) 172 of the light guide 17 described above, the total reflection condition of the main light can be satisfied, and it is not necessary to provide a reflection film such as aluminum on the reflection part 172. Light can be reflected efficiently, and an aluminum thin film deposition operation accompanied by an increase in manufacturing cost is not required, and a bright light source can be realized at a lower cost. Also, each relative angle β was set to an angle such that the connecting surface 172b becomes a shadow with respect to the light diffused by the composite diffusion block 16 and the diffusion plate 18a. Thereby, by suppressing the incidence of unnecessary light on the connecting surface 172b, reflection of unnecessary light can be reduced, and a light source device with good characteristics can be realized.

  In general, the inclination of main light rays incident on the liquid crystal display panel is preferably close to vertical, however, depending on the characteristics of the liquid crystal display panel, as shown in FIG. It is also possible. That is, some commercially available liquid crystal display panels have better characteristics when the incident angle is tilted by about 5 to 10 °. In this case, the η is 5 ° according to the characteristics. It is desirable to set it to -10 degrees.

  Further, instead of tilting the panel by η, it is possible to tilt the main light beam to the liquid crystal display panel by adjusting the angle of the reflecting surface 172a. Further, when it is necessary to incline the light beam toward the side surface of the light guide, the slope of the triangular texture 161 formed on the exit surface of the composite diffusion block 16 is asymmetrical or reflective. This may be realized by changing the direction of formation of the texture formed by the surfaces 172a and 172b.

  Next, the combined diffusion block 16 that is another component of the light source device 10 will be described with reference to FIGS. 7 and 8. FIG. 7 shows the synthetic diffusion block 16 integrated with the LED collimator 15, and FIGS. 8A and 8B show partially enlarged cross sections of the synthetic diffusion block 16.

  As is clear from FIG. 8A, many textures 161 having a substantially triangular cross section are formed on the exit surface of the composite diffusion block 16, and the texture 161 emits the light from the LED collimator 15. The light is diffused in the vertical direction of the illustrated paper surface of the incident portion (surface) 171 of the light guide body 17. Then, due to the interaction between the substantially triangular texture 161 and the diffusers 18a and 18b, the individual intensity distribution of the light emitted from the emitting portion 173 of the light guide 17 is obtained even if the LED collimators 15 are discretely arranged. It becomes possible to make uniform. In particular, the texture 161 allows the diffusion direction to be limited to the side surface direction of the light guide, and further, the diffusibility in the side surface direction can be controlled. Therefore, the first and second diffusion plates 18a, 18b, etc. It becomes possible to weaken the direction diffusivity, and as a result, the light utilization efficiency is improved, and a light source device with good characteristics can be realized. In this example, as an example of the substantially triangular texture 161, the angle γ = 30 degrees and the formation pitch a = 0.5 mm.

  As described in detail above, according to the light source device 10 of the present invention, the light use efficiency of the laser light from the LED light source and the uniform illumination characteristics thereof are further improved, and at the same time, the light source device is downsized and reduced in cost. Therefore, it is possible to provide a light source device that is particularly suitable as an illumination light source in a display device of an electronic device such as a HUD or a micro projector.

<Modification of light source device>
10 and 11 show a modified example of the light source device according to one embodiment of the present invention. As a modified example, an overall external perspective view of the light source device 10b and its internal configuration are shown. In this modification, by using the synthetic diffusion block 16b having a substantially trapezoidal cross section, the LED collimator 15 having a plurality of conical convex shapes to which the LEDs are attached is attached at an inclined position below the apparatus. In addition, the code | symbol 13b in a figure is a heat sink for cooling the heat | fever which generate | occur | produces with an LED element and a control circuit.

<Other Modifications of Light Source Device>
Furthermore, FIG. 12 shows another modification of the light source device according to one embodiment of the present invention, and an overall external perspective view of the light source device 10c is shown as another modification. Although not shown in detail in this other modification, the heat generated in the LED substrate 12 is cooled by the heat sink 13c disposed at the lower part of the apparatus through the heat transfer plate 13d. With this configuration, a light source device with a short overall length can be realized.

<Another embodiment of the collimator in the light source device>
Further, FIG. 13 shows another form of the collimator 15b in the light source device according to one embodiment of the present invention, and shows an example of a shape in which the above-described combined diffusion block 16 is combined. The collimator shape shown in FIG. 7 and FIG. 8 was a conical convex shape obtained by rotating a substantially parabolic break, but this shape is based on a substantially quadrangular pyramidal convex shape and the corners are chamfered. Curved shape. Considering the efficiency of the light emitted from the light guide 17 from the light emitted from the LED, the rotary paraboloid shape shown in FIGS. 7 and 8 is appropriate, but this configuration has a substantially quadrangular pyramid convex shape. Since the boundaries of the two are smoothly connected, a more uniform light intensity distribution can be realized.

  It will be apparent that the light source devices 10b and 10c, which are modifications of the light source device of the present invention described above, have the same operations and effects as the light source device 10 shown in FIG. According to these light source devices 10, 10 b, and 10 c, by appropriately selecting them, even in an electronic device such as a HUD or a micro projector that may have various shapes and forms, It can be securely attached to fit the storage space.

<Application example of light source device>
In addition, an example in which the above-described light source device 10 of the present invention is mounted on a HUD and a micro projector as a typical example of an electronic device that is used as a light source of the display device will be described below.

  FIG. 14A shows an example in which the above-described light source device according to an embodiment of the present invention is applied to HUD. In this figure, in the head-up display device 100, an image displayed on an image display device 300 such as a projector or an LCD (Liquid Crystal Display) is displayed on a mirror 151 or other mirror 152 (for example, a free-form surface mirror or light). The light is reflected by a mirror having an axially asymmetric shape and projected onto the windshield 3 of the vehicle 2. On the other hand, the driver 105 views the image as a virtual image in front of the transparent windshield 103 by viewing the image projected on the windshield 103.

  FIG. 14B shows an example of the internal configuration of the head-up display device 100, particularly the video display device 300. As is apparent from this figure, the case where the video display device 300 is a projector is shown. The video display device 300 includes, for example, each unit such as a light source 301, an illumination optical system 302, and a display element 303. In addition, if the light source device 10 of the present invention described above is employed as the light source 301, it is possible to generate good illumination light for projection.

  In this example, an illumination optical system 302 that is an optical system that condenses the illumination light generated by the light source 301 and makes it uniform and irradiate the display element 303 is added, and an element that generates an image to be projected The display element 303 is included. However, in these embodiments, these elements are already used as the composite diffusion block 16, the first diffusion plate 18a, the light guide 17, the second diffusion plate 18b, and the liquid crystal display panel 52. It is included in the light source device 10 of the present invention. Therefore, the light source device 10 of the present invention can be used as the video display device 300 of the head-up display device 100 as it is. According to this, in particular, it is possible to realize the head-up display device 100 that can be easily attached to a narrow space such as a dashboard in an automobile.

  It is obvious to those skilled in the art that the light emitted from the video display device 300 is further projected onto the windshield 103 of the vehicle 102 via the display distance adjusting mechanism 400 and the mirror driving unit 500. Let's go.

  FIG. 15 shows an example in which the above-described light source device of the present invention is applied to a projector. As is clear from the figure, the projector is composed of a plurality of lens groups indicated by reference numerals G1 to G3 and a single mirror indicated by reference numeral M13. In the figure, the projected light is indicated by solid and broken arrows.

  In the figure, a light source P0 and an image display element P1 (reflection type image display element) are disposed on the opposite surface of the prism optical element. Therefore, the light source device 10 of the present invention described above as the light source P0. By adopting, it becomes possible to generate good illumination light. In this example as well, these elements are already included in the light source device 10 of the present invention as the composite diffusion block 16, the first diffusion plate 18a, the light guide 17, and the second diffusion plate 18b. Since it is included as the liquid crystal display panel 52, the light source device 10 of the present invention can be mounted in the projector as it is. According to this, it is possible to easily attach to the space in the projector, and to realize a smaller and cheaper projector.

  As described in detail above, by using the light source device 10 of the present invention as an illumination light source of a display device, it can be easily attached to a narrow space, and is smaller and less expensive. An electronic device can be realized.

  The planar light source device suitable for use in an electronic apparatus provided with an image display device according to various embodiments of the present invention has been described above. However, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are described in detail for the entire system in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 10 ... Light source device (main body), 11 ... Case, 50 ... Liquid crystal display element, 12 ... LED board, 13 ... Heat sink, 14a, 14b ... LED, 15 ... LED collimator, 16 ... Synthetic diffusion block, 17 ... Light guide, 171 ... Light guide light incident part (surface), 172 ... Light guide light reflection part (surface), 172a ... Reflection surface, 172b ... Connection surface, 173 ... Light guide light emission part (surface)

Claims (16)

A solid light source;
A collimating optical system that converts light emitted from the solid-state light source into substantially parallel light;
A light guide that emits light emitted from the collimating optical system and emits the light in a direction different from the incident direction;
A light source device comprising:
The light guide has an incident part for entering light, a reflecting part for reflecting incident light, and an emitting part for emitting light reflected by the reflecting part, and the reflecting part reflects incident light. And a plurality of connecting surfaces connecting the plurality of reflecting surfaces, and the incident portion is configured to emit light in a direction in which an incident angle of light incident on the reflecting surface of the reflecting portion is larger. A light source device having a structure for deflecting the light source. The light source device according to claim 1,
A scatterer is provided between the collimating optical system and the light guide,
The connecting surface of the reflection unit is inclined with respect to incident light at an angle that becomes a shadow in a range of a half-value angle of the scatterer. The light source device according to claim 1,
The light source device, wherein the incident surface deflection structure of the light guide is an inclined surface arranged obliquely with respect to incident light. The light source device according to claim 3.
The light source device, wherein at least a part of the obliquely arranged slope is a curved surface. The light source device according to claim 2,
The elevation angle of the reflective surface formed in the reflective part of the light guide is different depending on the location, and the relative angle between the adjacent reflective surface and the connecting surface is 90 degrees or more. The light source device according to claim 5,
The light source device, wherein a relative angle between the adjacent reflecting surface and the connecting surface is a constant value regardless of a place. The light source device according to claim 5,
The absolute value of the elevation angle of the connecting surface is a constant value regardless of the location. The light source device according to claim 5,
The length Lr of the slope projected in the normal direction with respect to the emission direction of the plurality of reflection surfaces of the reflection portion and the normal direction with respect to the emission direction of the connection surface connected to the reflection surface and the light incident opposite side The ratio between the projected slope length Lc and the ratio Lr / Lc varies depending on the location. The light source device according to claim 8,
The light source device in which the ratio Lr / Lc is minimum near the center of the reflecting portion. The light source device according to claim 8,
The light source device, wherein the length sum Lr + Lc is substantially constant. The light source device according to claim 8,
The light source device, wherein the sum of lengths Lr + Lc is 0.6 mm or less and 0.2 mm or more. The light source device according to claim 8,
The sum of lengths Lr + Lc is reduced at least in part as it approaches the exit surface of the light guide, and the sum of lengths Lr + Lc is 0.6 mm or less, and The light source device is 0.2 mm or more. The light source device according to claim 1,
A light source device in which a texture structure for diffusing light is formed on an exit surface of the collimating optical system.   An electronic apparatus using the light source device according to claim 1 as an image display device.   The electronic device according to claim 14 is an HUD.   The electronic apparatus according to claim 14 is a projector.

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