JP2019191329A - Light-emitting device and image display system - Google Patents

Abstract

To provide a light-emitting device which suppresses stray light to minimize undetectable region when used for detecting the position of a pointer, for example, and to enhance light utilization efficiency, and to provide an image display system using such light-emitting device.SOLUTION: An apex of a conical mirror is at a distance from an optical axis of a light source. In other words, the conical mirror is positioned off the optical axis. Such an arrangement minimizes generation of components of light, such as infrared, emitted from the light source that head toward a side opposite an irradiated surface of an image display system, and allows for efficiently emitting the light along the irradiated surface.SELECTED DRAWING: Figure 5A

Description

  The present invention relates to a light emitting device applicable to, for example, a projector as an image display system and an image display system using the light emitting device.

  Conventionally, in an image display system such as a projector, in order to detect the position of an indicator such as a pen operated on a display surface on which an image is displayed or a user's finger, infrared light or the like is projected along the projection surface. A light emitting device for emitting light is known. For example, there is known one that emits light by combining a conical mirror and a folded arc mirror (see, for example, Patent Document 1).

  However, in Patent Document 1, for example, the component reflected from the circular mirror toward the circular mirror from the circular mirror returns to the circular mirror side again, and stray light can be generated by unintentional reflection at the circular mirror. There is sex. Due to the occurrence of such stray light, there is a possibility that an undetectable area may be generated or the light use efficiency may be deteriorated when the position of the indicator is adopted as described above.

U.S. Pat. No. 9400574

  A light emitting device according to one embodiment of the present invention includes a light source that emits light, and a conical mirror that has a vertex at a position off the optical axis of the light source and widens the angle of light emitted from the light source.

  In the light emitting device, the apex of the conical mirror is set to a position deviated from the optical axis of the light source, that is, the conical mirror is shifted from the optical axis of the light source. As a result, for example, components such as infrared light directed to the opposite side of the screen in the image display system can be reduced, so that generation of stray light based on components from the folding mirror is suppressed, and infrared light directed to the screen is suppressed. More components, such as light, can be emitted along the screen efficiently.

  An image display system according to an aspect of the present invention projects the light emission device, a detection device that detects a reflection position of light emitted from the light emission device, and an image according to a detection result detected by the detection device. A projection device.

  In the image display system, when the light emitting device is provided, when performing a so-called interactive image display in which the detection device performs a display according to the locus of the indicator based on a detection result or a display change, an infrared image is displayed. The component to be detected by the detection device such as light can be efficiently emitted along the screen from the light emission device.

It is a side view showing a schematic structure of an image display system incorporating a light emission device concerning a 1st embodiment. It is a block diagram which shows schematic structure of an image display system. It is a front view which shows schematic structure of the light emission apparatus which concerns on 1st Embodiment. It is a perspective view which shows schematic structure of a light emission apparatus. It is a conceptual side view for demonstrating arrangement | positioning of each part which comprises a light emission apparatus. It is a conceptual top view for demonstrating arrangement | positioning of each part which comprises a light emission apparatus. It is a front view which shows the mode of the light ray inject | emitted from a light emission apparatus. It is a perspective view which shows the mode of the light ray inject | emitted from a light emission apparatus. It is a conceptual front view which shows the ideal radiation intensity distribution with respect to the to-be-irradiated surface. It is a conceptual front view which shows about actual radiation intensity distribution with respect to the irradiated surface of light. It is a front view which shows schematic structure of the light emission apparatus which concerns on 2nd Embodiment. It is a perspective view which shows schematic structure of a light emission apparatus. It is a front view which shows the mode of the light ray inject | emitted from a light emission apparatus. It is a perspective view which shows the mode of the light ray inject | emitted from a light emission apparatus. It is a conceptual front view which shows about actual radiation intensity distribution with respect to the to-be-irradiated surface. It is a conceptual top view for demonstrating arrangement | positioning of each part which comprises the light-emitting device and light-emitting device which concern on 3rd Embodiment.

[First Embodiment]
Hereinafter, an example of the light emission apparatus according to the first embodiment and an image display system including the light emission apparatus will be described with reference to FIG. 1 and the like.

  As conceptually shown in FIG. 1, the image display system 100 of the present embodiment includes a projector 1 and a light emitting device 2. As shown in FIG. 2, the projector 1 includes a projection device 15 that is a main body portion that performs image projection, and a detection device that detects reflected light RL that is a component caused by the light EL emitted from the light emission device 2. As an imaging device 16.

  The projection device 15 includes a projection light source 11, a light modulation device 12, a projection lens 13, and a control unit 14, and displays an image according to input image information and an image according to a detection result detected by the imaging device 16. In order to project, the image light GL is projected from the projection lens 13. As shown in FIG. 1, the projector 1 is supported by a support device M installed on the upper surface of the irradiated surface SC such as a screen or a white board, and projects an image onto the irradiated surface SC from the side facing downward. . In the following, for convenience of explanation, as shown in FIG. 1, the direction toward the irradiated surface SC is the forward direction (+ Y direction) with the normal direction to the irradiated surface SC as the front-rear direction, and the direction against gravity is upward. (+ Z direction), the right side toward the irradiated surface SC is described as the right direction (+ X direction). The irradiated surface SC is a surface parallel to the XZ plane.

  The projection device 15 modulates the light emitted from the projection light source 11 by the light modulation device 12 according to the image information, and projects the modulated light from the projection lens 13 onto the irradiated surface SC. As the light modulation device 12, a device using a liquid crystal panel or a micromirror device, for example, a device using DMD or the like can be used.

  The control unit 14 includes a CPU, a ROM, a RAM, and the like, and functions as a computer. In addition to controlling the operation of the projector 1, for example, control related to image projection based on information output from the imaging device 16 or the like. I do.

  As shown in FIG. 1, the light emitting device 2 is installed on a wall surface above the irradiated surface SC serving as a target plane, and emits light EL along the irradiated surface SC. Here, for example, as the light EL, laser infrared light that emits a wavelength having a light intensity peak of about 940 nm is emitted.

  The imaging device 16 includes, for example, an imaging element (not shown) such as a CCD or CMOS, images the irradiated surface SC to which the image light GL is irradiated, and outputs the captured information to the control unit 14. At this time, the imaging device 16 also uses an indicator (for example, a pen or a user's finger) in which the light EL that is infrared light emitted from the light emitting device 2 is in the irradiated surface SC or in the vicinity thereof. By detecting the reflected light RL that is the reflected component, the position of the indicator (reflection position) is detected, and the detected information is output to the control unit 14. The projector 1 analyzes the position of the indicator on the irradiated surface SC based on the information output from the imaging device 16, and based on the analysis result, for example, a line indicating the locus of the indicator in the image information. Projecting the superimposed image and changing the projected image are performed. As described above, an interactive image display that is an image display corresponding to the user's operation on the irradiated surface SC can be performed.

  Hereinafter, with reference to FIG. 3 etc., the structure of the light emission apparatus 2 is demonstrated in detail. FIG. 3 is a front view illustrating a schematic configuration of the light emitting device 2. FIG. 4 is a perspective view showing a schematic configuration of the light emitting device 2. As shown in the drawing, the light emitting device 2 is spaced upward (+ Z side) from the irradiated surface SC, and is disposed substantially at the center of the irradiated surface SC in the left-right direction. That is, the light emitting device 2 is disposed at the center position CX of the irradiated surface SC. The light emitting device 2 includes a first light emitting unit 3, a second light emitting unit 4, and a cover glass 22 that covers an emission side of light from these. Of these, the first light emitting portion 3 and the second light emitting portion 4 have a pair of symmetrical configurations with respect to the center position CX.

  Of the light emitting device 2, the first light emitting unit 3 includes a first light source 31, a first collimator 32, and a first conical mirror 33. Similar to the first light emitting unit 3, the second light emitting unit 4 includes a second light source 41, a second collimator 42, and a second conical mirror 43. That is, the light emitting device 2 has a pair configuration including two light sources and two conical mirrors.

  Hereinafter, each part which comprises the 1st light emission part 3 is demonstrated. Note that the second light emitting unit 4 is the same as that of the first light emitting unit 3, and thus the description thereof is omitted.

  First, in the first light emitting unit 3, the light source 31 is a laser light source that emits a wavelength having a light intensity peak of about 940 nm as described above.

  The collimator 32 substantially parallelizes the light emitted from each point of the light source 31. Here, the collimator 32 collimates the incident light EL and emits it in the Y direction. In other words, as shown in the drawing, the optical axis AX of the light source 31 serving as the central axis of the light EL emitted from the collimator 32 extends along the Y direction.

  The first conical mirror 33 is formed by providing a mirror surface RF on the right-side conical side surface portion SS. Of the first conical mirror 33, the mirror surface RF is disposed so as to face the light emission side of the light source 31 and the collimator 32. Further, the bus bar of the side surface portion SS is inclined 45 ° with respect to the Y direction. Thereby, in the 1st light emission part 3, light EL inject | emitted in the Y direction from the collimator 32 is reflected by the mirror surface RF of the 1st cone-shaped mirror 33, and along a surface parallel to XZ plane, That is, the light EL is widened along the irradiated surface SC.

  Similarly, in the second light emitting unit 4, the light EL is widened along the irradiated surface SC. As described above, in the light emitting device 2, the light EL emitted from the light sources 31 and 41 passes through the first and second conical mirrors 33 and 43 so that the entire irradiated surface SC is widened. It is spread like a curtain to cover it.

  Here, in the present embodiment, the centers of the first and second conical mirrors 33 and 43 are arranged so as to be out of the optical axis AX of the light sources 31 and 41. That is, the first and second conical mirrors 33 and 43 are located at positions shifted from the optical axis AX of the light sources 31 and 41. Thereby, the light emission apparatus 2 reduces the generation | occurrence | production of the component of light EL which goes to the opposite side to the screen, ie, to-be-irradiated surface SC, for example in the image display system 100, and enables efficient light emission.

  Hereinafter, with reference to FIG. 5, the arrangement of each part of the light emitting device 2 will be described. FIG. 5A is a conceptual side view for explaining the arrangement of each part constituting the light emitting device 2, and FIG. 5B is a plan view.

  Here, as shown in FIG. 5A, first, regarding the shape of the first conical mirror 33 which is a right cone type in the first light emitting section 3, it is set as a vertex PK and a central axis OX passing through the vertex PK. . That is, the vertex PK is located closest to the −Y side, and the center axis OX extends along the Y direction. Furthermore, the generatrix GE about the side surface portion SS where the mirror surface RF is formed is inclined 45 ° with respect to the Y direction. Thus, in the case shown in the figure, the light EL emitted in the + Y direction from the light source 31 side is folded back 90 degrees at the first conical mirror 33, and in one of the in-plane directions parallel to the XZ plane. Head. Note that the component of the light EL reflected from the mirror surface RF other than the example shown in FIG. 5A is also emitted in the in-plane direction parallel to the XZ plane. The same applies to the second light emitting unit 4 or the second light source 41, the second collimator 42, and the second conical mirror 43 that constitute the above.

  Further, as shown in FIGS. 5A and 5B, in the pair of light emitting units 3 and 4, that is, in the pair of light sources 31 and 41, the collimators 32 and 42, and the conical mirrors 33 and 43, the conical mirror 33, 43, the apex PK of the conical mirrors 33, 43 is deviated from the optical axis AX of the light sources 31, 41 so that the light EL is reflected and emitted in a direction away from each other. In other words, the pair of conical mirrors 33 and 43 has a vertex PK at a position deviating from the optical axis AX of the corresponding light source 31 or 41 in a direction approaching each other. More specifically, in the illustrated example, first, in the first light emitting unit 3, the vertex PK of the first conical mirror 33 deviates from the optical axis AX of the first light source 31 to the + Z side by a distance H1. And deviated to the + X side by a distance W1. Or it is shifting. Further, in the second light emitting unit 4, the vertex PK of the second conical mirror 43 is deviated to the + Z side by the distance H1 from the optical axis AX of the second light source 41, and is −X side by the distance W1. It is off. Or it is shifting. In the above case, the first light emitting unit 3 emits the light EL mainly toward the −X side (left side) half of the irradiated surface SC (see FIG. 3 and the like), and the second light emitting unit 4. As a result, the light EL is emitted mainly toward the + X side (right side) half of the irradiated surface SC, and the light EL spreads uniformly and uniformly over the entire irradiated surface SC. It has become.

  Further, if the way of viewing is changed, the vertex PK of each of the conical mirrors 33 and 43 is away from the irradiated surface SC, which is the target region to be covered with the light EL, from the optical axis AX of the light sources 31 and 41. It is off.

  As a result of the above configuration, for example, as shown in FIGS. 6 and 7, the light EL that is a light beam emitted from the light emitting device 2 is positioned below the light emitting device 2, that is, on the −Z side. It becomes in a state of spreading in a curtain shape covering the irradiated surface SC (see FIG. 3 etc.) spreading in parallel with the XZ plane.

  Hereinafter, with reference to FIG. 8, the intensity distribution when emitted from the light sources 31 and 41 will be considered. FIG. 8A is a conceptual front view showing an ideal radiation intensity distribution with respect to the irradiated surface SC of the light EL. On the other hand, FIG. 8B is a conceptual front view showing the radiation intensity distribution with respect to the irradiated surface SC of the light EL in the above configuration. That is, it is a figure which shows an example about actual radiation intensity distribution.

  Here, in order to reliably perform the above-described interactive operation in the image display system 100, it is most ideal that the indicator is detected with uniform accuracy anywhere on the irradiated surface SC. Considering this as the configuration of the light emitting device 2, as shown in FIG. 8A, the light emitting device 2 composed of a pair of light emitting portions 3 and 4 is equally applied to the irradiated surface SC that is rectangular. It is ideal that the light EL can be emitted with a simple intensity distribution. On the other hand, in the present embodiment, in FIG. 8B, the intensity distribution of the light EL emitted from the light emitting device 2 with respect to the irradiated surface SC is schematically shown as a graph. In FIG. 8B, the intensity distribution of the first light emitting unit 3 in the light emitting device 2 is indicated by reference numeral 3L, and the intensity distribution of the second light emitting part 4 is indicated by reference numeral 4L. The intensity distribution of the light emitting device 2 as a whole is indicated by reference numeral 2L, and corresponds to a superposition of the intensity distribution indicated by reference numeral 3L and the intensity distribution indicated by reference numeral 4L. As indicated by reference numeral 2L, in this embodiment, it can be seen that the state is close to the ideal state shown in FIG. 8A.

  Among the above, the displacement amount of the conical mirrors 33 and 43 with respect to the optical axis AX may be various depending on the size of the light source (the cross-sectional size of the light bundle), etc. For the horizontal direction), that is, the value of the distance W1 shown in FIG. 5 is about 1.1 mm, and for the Z direction (vertical direction), that is, for the value of the distance H1 shown in FIG. It is conceivable to make the degree.

  As described above, in the light emitting device 2 of one aspect according to the present embodiment, the vertex PK of the conical mirrors 33 and 43 is set to a position deviated from the optical axis AX of the light sources 31 and 41, that is, the optical axis AX. The conical mirrors 33 and 43 are positioned so as to be displaced from each other. Thereby, the component which goes to the opposite side to the to-be-irradiated surface SC in the image display system 100 among the light EL inject | emitted from the light sources 31 and 41 which are infrared light etc. can be reduced. That is, in this case, the generation of stray light is suppressed, and by increasing the number of components toward the irradiated surface SC, the light EL can be efficiently emitted along the irradiated surface SC.

  In addition, the image display system 100 according to one embodiment of the present embodiment includes the light emitting device 2 as described above, and thus displays according to the locus of the indicator based on the detection result by the imaging device 16 as the detection device. In addition, when performing so-called interactive image display in which display is changed, the light EL that becomes the reflected light RL that is a component to be detected by the imaging device 16 is efficiently emitted from the light emitting device 2 along the screen. You can make it.

In the configuration of the present embodiment, the light EL is diffused in one direction, so that the light intensity is proportional to 1 / r where r is the distance from the light source. That is, in the case where light is diffused two-dimensionally, it is proportional to 1 / r ^2. Compared with this, strong light can reach farther.

  Moreover, in this embodiment, the light emission apparatus has a pair configuration including two light sources and two conical mirrors. Thereby, the intensity of the emitted light EL can be ensured. On this basis, the conical mirror is shifted as described above with respect to the light source, so that the light intensity distribution is particularly steadily increased downward.

[Second Embodiment]
Hereinafter, the light emitting apparatus according to the second embodiment will be described with reference to FIGS. This embodiment is a modification of the first embodiment, and is the same as the case of the first embodiment except that it is configured to include a folding mirror that folds the component emitted from the conical mirror. The same reference numerals are applied to those having the above functions, and detailed description and illustration of each part are omitted. The application to the image display system is the same as in the case of the first embodiment, and is therefore omitted.

  FIGS. 9 and 10 correspond to FIGS. 3 and 4 shown in the first embodiment, respectively, and FIGS. 11 and 12 correspond to FIGS. 6 and 7 shown in the first embodiment, respectively. It is a figure and is a figure which shows the structure of the light emission apparatus 202 which concerns on this embodiment. Further, FIG. 13 is a diagram corresponding to FIG. 8B shown in the first embodiment, and is a conceptual front view showing the radiation intensity distribution with respect to the irradiated surface of the light EL in the configuration of the light emitting device 202 according to the present embodiment. FIG. That is, it is a figure which shows another example about actual radiation intensity distribution.

  In the light emitting device 202 according to the present embodiment, as shown in FIGS. 9 to 12, a V-shaped folding mirror 5 is provided immediately above (+ Z side) the pair of conical mirrors 33 and 43. Yes. The folding mirror 5 is composed of a plate-like portion 53 and a plate-like portion 54 having different inclination angles, and has a V-shape that is symmetrical about the center position CX. That is, the plate-like portion 53 is arranged to face the first conical mirror 33 and the plate-like portion 54 is opposed to the second cone-shaped mirror 43 at the same size and at different inclination angles. Each of the plate-like portions 53 and 54 rises upward from the center side close to the center position CX toward the peripheral side, that is, in the + Z direction. By providing a mirror surface on the surface of each plate-like portion 53, 54 that faces the conical mirrors 33, 43, the plate-like portions 53, 54 emit light emitted from the cone-shaped mirrors 33, 43, respectively. In EL, the component emitted to the upper side, that is, the side opposite to the irradiated surface SC side, which is the target region to be covered, is folded. At this time, in the present embodiment, as described above, since the conical mirrors 33 and 43 are located at positions shifted from the optical axis AX, the components reflected by the folding mirror 5 are conical. In this case, unintended reflection is suppressed. That is, the generation of stray light based on the component from the folding mirror 5 is suppressed. In this case, by adjusting the components from the folding mirror 5 so that they can be used more effectively, the light emitting device 202 increases the components of the light EL toward the irradiated surface SC and efficiently applies the components to the irradiated surface SC. Can be fired along.

  Here, regarding the above dimensions, first, the amount of deviation of the conical mirrors 33 and 43 with respect to the optical axis AX may be the same as that in the first embodiment, for example. That is, it is conceivable to shift about 1.1 mm in the X direction (lateral direction) and about 1.0 mm in the Z direction (vertical direction). Further, here, it is conceivable that the mirror lengths L1 and L2 of the mirror portions in the plate-like portions 53 and 54 are, for example, about 15 mm and the inclination angle θ is about ± 8 °.

  In addition, when the folding mirror 5 is provided in this way so that the component going in the direction opposite to the irradiated surface SC is returned to the direction of the irradiated surface SC, in particular, the corner side near the light emitting device 202 of the irradiated surface SC. Thus, the intensity of the light EL on the upper corner side (+ Y side corner) can be increased, and light can be used with high efficiency.

  As described above, also in the light emitting device 202 of one aspect according to the present embodiment, the conical mirrors 33 and 43 are placed at positions away from the optical axis AX of the light sources 31 and 41, that is, with respect to the optical axis AX. Thus, the conical mirrors 33 and 43 are in a shifted position. Thereby, the component which goes to the opposite side to the to-be-irradiated surface SC in an image display system among the light EL inject | emitted from the light sources 31 and 41 which are infrared light etc. can be reduced. That is, in this case, the light EL can be efficiently emitted along the irradiated surface SC by increasing the components toward the irradiated surface SC while suppressing the generation of stray light. Further, in the case of the present embodiment, further efficient use of light can be achieved by the folding mirror.

[Third Embodiment]
Hereinafter, the light emitting device according to the third embodiment will be described with reference to FIG. The present embodiment is a modification of the first embodiment and the like, and is the same as the first embodiment except that the light emitting device is configured by one light emitting unit. The same reference numerals are applied to those having functions, and detailed description and illustration of each part are omitted. The application to the image display system is the same as in the case of the first embodiment, and is therefore omitted.

  FIG. 14 is a diagram corresponding to FIG. 5B illustrated in the first embodiment, and is a diagram illustrating a configuration of the light emitting device 302 according to the present embodiment.

  In the light emitting device 302 according to the present embodiment, as shown in the figure, in the single light emitting unit 3, that is, in the single light source 31, the collimator 32 and the conical mirror 33, the vertex PK of the first conical mirror 33 is The distance from the optical axis AX of the first light source 31 to the + Z side by the distance H1. Or it is shifting. Further, if the way of viewing is changed, the apex PK of the conical mirror 33 deviates from the optical axis AX of the light source 31 in a direction away from the irradiated surface SC side, which is a target region to be covered by the light from the light source 31. ing. Thereby, the light emission part 3 will be in the state which the light spread uniformly and without wrinkles with respect to the whole to-be-irradiated surface.

  As described above, also in the light emitting device 302 of one aspect according to the present embodiment, the conical mirror 33 is positioned away from the optical axis AX of the light source 31, that is, the conical mirror with respect to the optical axis AX. 33 is in a shifted position. Thereby, the component which goes to the opposite side to the to-be-irradiated surface in an image display system among the lights inject | emitted from the light source 31 which is infrared light etc. can be reduced. In the case of this embodiment, for example, the light emitting device can be reduced in size and weight.

  As described above, according to a specific aspect of the present invention, a folding mirror that folds back the component emitted from the conical mirror is provided. In this case, for example, the intensity of light on the upper corner side can be increased, and light can be used with high efficiency.

  In another aspect of the present invention, the folding mirror has a V shape having two surfaces with different angles. In this case, for example, light can be expanded in the left-right direction.

  In yet another aspect of the present invention, the folding mirror reflects a component emitted from the component reflected by the conical mirror to the side opposite to the target region side to be covered with light. In this case, the light utilization efficiency can be further increased.

  In still another aspect of the present invention, a pair of two light sources and two conical mirrors are provided. In this case, the intensity of emitted light can be ensured in a higher state than in the case of a single light source.

  In still another aspect of the present invention, the pair of conical mirrors has a vertex at a position deviating from the optical axis of the light source in a direction approaching each other. In this case, the light can be uniformly and uniformly spread over the entire target region to be covered with light.

  In still another aspect of the present invention, the apex of the conical mirror deviates from the optical axis of the light source in a direction away from the target region side to be covered with light. In this case, more light can be reflected to the target region side to be covered with light by reflection on the conical mirror.

[Others]
Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the scope of the invention.

  First, in each of the embodiments described above, the conical mirrors 33 and 43 may have a cut shape, for example, at a portion that is not used for light reflection.

  In the second embodiment, the folding mirror 5 has a V shape having two surfaces with different angles. However, the present invention is not limited to this, and for example, a single plate shape may be considered. Also in the third embodiment, a folding mirror as in the second embodiment may be provided.

  In each of the above-described embodiments, the configuration using the so-called front projector 1 as the image display system 100 has been described. However, the configuration is not limited to this as long as the configuration uses an image display device. For example, the structure which covers the image display surfaces, such as a liquid crystal display and an organic electroluminescent display, with the light from a light emission apparatus may be sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Light emission apparatus, 2L, 3L, 4L ... Code | symbol, 3, 4 ... Light emission part, 5 ... Folding mirror, 11 ... Light source for projection, 12 ... Light modulation apparatus, 13 ... Projection lens, 14 ... Control unit, 15 ... projection device, 16 ... imaging device, 22 ... cover glass, 31, 41 ... light source, 32, 42 ... collimator, 33, 43 ... conical mirror, 53, 54 ... plate-like part, 100 ... image Display system 202 ... Light emitting device 302 ... Light emitting device AX ... Optical axis CX ... Center position EL ... Light, GE ... Busbar, GL ... Video light, H1 Distance, L1, L2 ... Mirror length, M ... support device, OX ... center axis, PK ... vertex, RF ... mirror surface, RL ... reflected light, SC ... irradiated surface, SS ... side portion, W1 ... distance, [theta] ... tilt angle

Claims (8)

A light source that emits light;
A light emitting device comprising: a conical mirror having a vertex at a position off the optical axis of the light source and widening the light emitted from the light source.   The light emission apparatus according to claim 1, further comprising a folding mirror that folds the component emitted from the conical mirror.   The light emission device according to claim 2, wherein the folding mirror has a V shape having two surfaces with different angles.   The said folding mirror reflects the component inject | emitted on the opposite side to the object area | region side which should be covered with light among the components reflected by the said cone-shaped mirror. Light emission device.   The light emission device according to any one of claims 1 to 4, wherein the light emission device has a pair configuration including two light sources and two conical mirrors.   The light emitting device according to claim 5, wherein the pair of conical mirrors have apexes at positions deviating from the optical axes of the light sources in a direction approaching each other.   The light emitting device according to any one of claims 1 to 6, wherein a vertex of the conical mirror deviates from an optical axis of the light source in a direction away from a target region side to be covered with light. The light emitting device according to any one of claims 1 to 7,
A detecting device for detecting a reflection position of light emitted from the light emitting device;
An image display system comprising: a projection device that projects an image according to a detection result detected by the detection device.

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