JP2017054086A - Spatial image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spatial image display device that can prevent water from being adhered to a projection port.SOLUTION: A spatial image display device comprises: a water spraying mechanism 20 that sprays water from a water spraying port 23 to form a projection target surface (Sm); an image projection mechanism 30 that projects a projection image Pp from a projection port 47 to the projection target surface; and an airflow forming mechanism 50 that blows the air crossing over the projection port 47 from an air blowing port 52. The image projection mechanism 30 may include: an illumination optical system 31 that guides light from a light source 34 as illumination light; an image display element 32 that forms the projection image Pp with the illumination light guided by the illumination optical system 31; and a projection optical system 33 that enlarges and projects the projection image Pp formed by the image display element 32 to the projection target surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spatial image display device.

  Conventionally, a spatial image display device that forms a fog screen as a projection surface with fog and projects a projection image on the fog screen is known.

  In such a spatial image display device, a fog screen is formed with fog sprayed from the fog injection port of the fog generation mechanism, and a projection image is projected from the projection port of the image projection mechanism toward the fog screen, so that the space is displayed. The projected image can appear to float. In this spatial image display device, it is necessary to increase the distance between the image projection mechanism (projection port) and the fog screen in order to appropriately project the projection image on the fog screen. The reduction of the overall size is limited by the enlargement performance of the image projection mechanism.

  By the way, in recent years, an image projection mechanism capable of appropriately projecting a projection image onto a projection surface at an extremely close position has been considered (see, for example, Patent Document 1). For this reason, in the spatial image display device, by using such an image projection mechanism, the interval between the image projection mechanism (projection port) and the fog screen can be extremely reduced. As a result, the overall size can be reduced.

  However, in the spatial image display device, since the projection port of the image projection mechanism is directed to the fog screen side to project the projection image toward the fog screen, there is a concern that fog sprayed from the fog spray port may adhere to the projection port. is there. This is more likely to occur as the distance between the image projection mechanism and the fog screen (fog generation mechanism) becomes smaller. Then, in the spatial image display device, the projection image (light) projected by the mist (its fine particles) adhering to the projection opening is scattered, and the image formation mechanism of the image projection mechanism is deteriorated or the projection image formed on the fog screen. There is a concern that the brightness of the image may be reduced and the quality of the projected image formed in the space may be reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a spatial image display device capable of preventing fog from adhering to a projection opening.

  The spatial image display device according to claim 1, a mist generation mechanism that forms a projection surface by injecting mist from a mist injection port, an image projection mechanism that projects a projection image from the projection port onto the projection surface, A wind forming mechanism that blows out the wind crossing the projection port from a wind outlet.

  In the spatial image display device according to the present invention, fog can be prevented from adhering to the projection port.

It is explanatory drawing which shows the spatial image display apparatus 10 of one Embodiment of the spatial image display apparatus of this invention. FIG. 2 is an explanatory diagram showing a state in which the spatial image display device 10 is viewed from an arrow A1 in FIG. FIG. 2 is an explanatory diagram illustrating a state in which the spatial image display device 10 is viewed from an arrow A2 in FIG. 2 is an explanatory diagram showing the internal configuration of the spatial image display device 10 in a block diagram. FIG. 4 is an explanatory diagram for explaining an optical configuration of an image projection mechanism 30 of the spatial image display device 10. FIG. 4 is an explanatory diagram schematically showing a positional relationship between a projection port 47 and a wind outlet 52 in the spatial image display device 10. FIG. It is explanatory drawing which shows the space image display apparatus 101 which has the wind formation mechanism 501 of a different structure from FIG. FIG. 8 is an explanatory diagram showing a spatial image display apparatus 102 having a wind forming mechanism 502 having a configuration different from that of FIGS. 3 and 7. FIG. 9 is an explanatory diagram showing a spatial image display device 103 having a wind forming mechanism 503 having a configuration different from that of FIGS. 3, 7, and 8. FIG. 10 is an explanatory diagram showing a spatial image display device 104 having a wind forming mechanism 504 having a configuration different from that of FIGS. 3, 7, 8, and 9. It is explanatory drawing which shows 10 A of spatial image display apparatuses of Example 1 as an example of the spatial image display apparatus of this invention. It is explanatory drawing which shows the positional relationship of the wind blower outlet 52A, the projection port 47, and the wind suction port 55 in the spatial image display apparatus 10A. It is explanatory drawing which shows typically the positional relationship of the blower outlet 52A in the spatial image display apparatus 10A and the projection port 47 similarly to FIG. It is explanatory drawing which shows the positional relationship of the wind blower outlet 52B, the projection port 47, and the wind suction port 55 in the spatial image display apparatus 10B of Example 2 as another example of the spatial image display apparatus of this invention. It is explanatory drawing which shows typically the positional relationship of the blower outlet 52B and the projection port 47 in the spatial image display apparatus 10B similarly to FIG. It is explanatory drawing which shows the positional relationship of the blower outlet 52C, the projection port 47, and the wind inlet 55 in the spatial image display apparatus 10C of Example 3 as another example of the spatial image display apparatus of this invention. It is explanatory drawing which shows typically the positional relationship of the blower outlet 52C and the projection port 47C in the spatial image display apparatus 10C similarly to FIG. It is explanatory drawing which shows spatial image display apparatus 10D of Example 4 as another example of the spatial image display apparatus of this invention. It is explanatory drawing which shows typically the positional relationship of the blower outlet 52D and the projection port 47D in spatial image display apparatus 10D similarly to FIG. It is explanatory drawing which shows the spatial image display apparatus 10E of Example 5 as another example of the spatial image display apparatus of this invention. It is explanatory drawing which shows typically the positional relationship of the wind outlet 52E and the projection port 47E in the spatial image display apparatus 10E similarly to FIG. It is explanatory drawing which shows the spatial image display apparatus 10F of Example 6 as another example of the spatial image display apparatus of this invention. It is explanatory drawing which shows typically the positional relationship of the blower outlet 52F and the projection port 47F in the spatial image display apparatus 10F similarly to FIG.

  Embodiments of the spatial image display device according to the present invention will be described below with reference to the drawings. First, a spatial image display device 10 according to an embodiment of a spatial image display device according to the present invention will be described with reference to FIGS. In FIG. 6, in order to facilitate understanding, the wind outlet 52 and the projection outlet 47 exist at the same horizontal position, and the wind W from the wind outlet 52 is blown out without hitting the projection outlet 47. (Α = 0 and β = 0).

  As shown in FIG. 1 and FIG. 2, the spatial image display device 10 as one embodiment forms a fog screen Sm as a projection surface with fog sprayed from a fog injection port 23 of the fog generating mechanism 20, and the fog A projection image Pp is projected from the projection port 47 of the image projection mechanism 30 toward the screen Sm. In this spatial image display device 10, the fog generation mechanism 20 and the image projection mechanism 30 are integrally provided, and the image projection mechanism 30 is disposed on the fog screen Sm side formed by the fog generation mechanism 20 (mist spray port 23). The projection 47 is directed. In the spatial image display device 10, a wind outlet 52 of the wind forming mechanism 50 is provided in the vicinity of the projection port 47, and the wind W crossing the projection port 47 is blown out from the wind outlet 52.

  In the spatial image display device 10, as shown in FIG. 3, a wind outlet 52 is provided between the projection outlet 47 that is rectangular when viewed from the front and the fog outlet 23, and the wind outlet 52 is the length of the projection outlet 47. The width dimension is larger than the side (the dimension in the vertical direction when FIG. 3 is viewed from the front). In the spatial image display device 10, the wind W is blown from the wind outlet 52 having a width larger than that of the projection port 47 onto the projection port 47, thereby crossing the projection port 47 over the entire area so as to cover the projection port 47. A wind W is formed.

  In this spatial image display device 10, as shown in FIG. 4, the integrated control unit 11, the storage unit 12, the operation unit 13, the fog generation mechanism 20, the image projection mechanism 30, and the wind formation mechanism 50 are configured as described above. Is provided. The integrated control unit 11 controls the operations of the spatial image display device 10, that is, the operations of the fog generation mechanism 20, the image projection mechanism 30, and the wind formation mechanism 50 based on a program stored in the storage unit 12 or the built-in internal memory 11 a. To control. Further, the integrated control unit 11 can acquire the data of the projection image Pp projected from the image projection mechanism 30 via the input / output terminal and the net line, and appropriately stores the data in the storage unit 12 and the internal memory 11a. The operation unit 13 starts and stops the operation of the spatial image display device 10, the direction in which the mist (its fine particles Fp) is ejected by the mist generation mechanism 20, the type of the projection image Pp projected by the image projection mechanism 30, the projection position, wind The direction of the wind W formed by the formation mechanism 50 can be adjusted. The integrated control unit 11 performs the various adjustments described above according to operations performed on the operation unit 13.

  The fog generation mechanism 20 includes a fog particle generation unit 21 and an injection unit 22. The mist particle generation unit 21 generates a large number of fine particles Fp so as to inject mist from the mist injection port 23 (see FIG. 1 and the like). In this embodiment, the ultrasonic wave in the storage unit that stores liquid is used. The vibrator is driven to generate fine particles Fp, and water is used as the liquid. The injection unit 22 causes the fine particles Fp generated by the mist particle generation unit 21 to be injected from the mist injection port 23 (see FIG. 1 and the like). In this embodiment, the mist particle generation unit 21 reaches the mist injection port 23. An air blower is provided in the air path. For this reason, in the mist generation mechanism 20, the spraying part 22 blows out the fine particles Fp of the water generated by the mist particle generating part 21 from the mist injection port 23 in a predetermined direction and in a predetermined range, so that the mist screen Sm. (See FIGS. 1 and 2). In this embodiment, the mist generating mechanism 20 (fog injection port 23) blows out water fine particles Fp upward in the vertical direction to form a mist screen Sm extending in the vertical direction. The mist generation mechanism 20 enables adjustment of the direction of the fine particles Fp blown out from the mist injection port 23. In this embodiment, fine particles blown out by enabling adjustment of the injection direction of the injection unit 22 with respect to the mist injection port 23. It is possible to adjust the direction of Fp. For this reason, in this one Embodiment, the fog injection port 23 and the injection part 22 function as an injection direction change part.

  The image projection mechanism 30 includes an illumination optical system 31 (see FIG. 5), an image display element 32, and a projection optical system 33 (see FIG. 5), and basically has the same configuration as that of Patent Document 1. In the image projection mechanism 30, the light source 34 of the illumination optical system 31, the image display element 32, and the focus adjustment unit 35 of the projection optical system 33 are connected to the integrated control unit 11 and appropriately controlled. The light source 34 is a light source for illumination light that the illumination optical system 31 guides to the image display element 32. The image display element 32 forms the projection image Pp with the illumination light guided by the illumination optical system 31, and in this embodiment, a reflection type image display element is used. Note that the image display element 32 may be, for example, a liquid crystal panel or another configuration as long as the projection image Pp is formed by the illumination light guided by the illumination optical system 31, and is not limited to this embodiment.

  The image display element 32 is formed by arranging a plurality of micromirrors, and the angle of each micromirror is individually changed in a range of + 12 ° to −12 ° as an example. For example, when the angle of the micromirror is −12 °, the image display element 32 has the light reflected by the micromirror incident on the projection optical system 33 and when the angle of the micromirror is + 12 °, It is set so that the light reflected in step S does not enter the projection optical system 33. Each micro mirror of the image display element 32 corresponds to each pixel of the projection image Pp that is projected and displayed on the fog screen Sm as the projection surface. In the image display element 32, the illumination light from the illumination optical system 31 is reflected by each micromirror, thereby forming the projection image Pp and the projection image Pp (projection image light constituting the projection image Pp) as the projection optical system 33. To enter. The projection optical system 33 enlarges the incident projection image Pp (its projection image light) and projects it onto the fog screen Sm. Thereby, in the image display element 32, the projection image Pp as an enlarged image displayed on the fog screen Sm can be formed by individually controlling the tilt angle of the micromirror.

  The focus adjustment unit 35 appropriately moves a later-described second lens group 42, third lens group 43, and fourth lens group 44 of the projection optical system 33 along the optical axis. These movement modes will be described later. The focus adjustment unit 35 adjusts the focus position in the projection optical system 33 by appropriately moving each lens group under the control of the integrated control unit 11.

  Next, the optical configuration of the illumination optical system 31 and the projection optical system 33 will be described. As shown in FIG. 5, the illumination optical system 31 includes an integrator rod 36, an image element illumination lens 37, a folding mirror 38, and a curved mirror 39 in addition to the light source 34 described above. The light source 34 condenses the emitted light at the entrance of the integrator rod 36 by the reflector 34a. The integrator rod 36 has a uniform light amount at the exit and is uniform light. For example, the light incident on the entrance using a light pipe formed by combining a plurality of mirrors into a tunnel shape. Is advanced to the exit port while being repeatedly reflected by each mirror. The lens 37 for illuminating the image element cooperates with the curved mirror 39 to irradiate the effective image area of the image display element 32 over the entire area with the light having passed through the integrator rod 36. The folding mirror 38 reflects the light that has passed through the image element illumination lens 37 toward the curved mirror 39. As a result, the illumination optical system 31 uses the light emitted from the light source 34 as an image as light emitted from the surface light source that captures the exit of the integrator rod 36 as a “surface light source with uniform light quantity and no unevenness”. The display element 32 is led to an effective image area, and the image display element 32 is illuminated.

  The projection optical system 33 is a non-telecentric optical system, and in order from the image display element 32 side (reduction side) to the fog screen Sm side (enlargement side), the first lens group 41, the second lens group 42, and the first lens group 41. A third lens group 43, a fourth lens group 44, a concave mirror 45, and an aperture stop 46; The first lens group 41 has a positive refractive power, the second lens group 42 has a positive refractive power, and the third lens group 43 has a negative refractive power. The fourth lens group 44 has a single or a plurality of aspherical lenses and free-form surface lenses. In FIG. 5, among the light beams emitted from each point on the image display element 32, the light beams emitted from the upper and lower ends of the image display element 32 are indicated by three lines. Three lines are shown as one line.

  In the projection optical system 33, a second lens group having a positive refractive power is disposed immediately after the first lens group 41, and the entire light beam that becomes thicker as it moves away from the image display element 32 is tightened. Moreover, the projection optical system 33 makes the lens surface closest to the second lens group 42 out of the lenses constituting the first lens group 41 convex on the second lens group 42 (concave mirror 45) side. The light beam traveling toward the second lens group 42 is brought close to the optical axis to assist in reducing the lens diameter on the concave mirror 45 side. Further, in the projection optical system 33, the first lens group 41 has a positive refractive power and the third lens group 43 has a negative refractive power, thereby ensuring a back focus. In the projection optical system 33, a fourth lens group 44 is arranged next to the third lens group 43, and an aspherical lens or a free-form surface lens is used for the fourth lens group 44, so that a fog formed at an extremely close position A projection image Pp is formed on the screen Sm. Thereby, in the projection optical system 33, the lens diameter of each lens constituting the refractive optical system from the first lens group 41 to the fourth lens group 44 can be reduced.

  The concave mirror 45 has a mirror surface that is a rotationally asymmetric free-form surface, and has optical performance that occurs when the lens diameter of the lenses constituting the refractive optical system from the first lens group 41 to the fourth lens group 44 is reduced. Reflecting toward the projection port 47 while compensating for the deterioration of the lens. In particular, the concave mirror 45 compensates for deterioration of distortion and curvature of field. In addition, the concave mirror 45 can be made free-form to achieve a sufficiently high optical performance and a small size even if the amount of separation of each light beam in the concave mirror 45 is small. The projection port 47 is a member located at the exit end of the projection optical system 33, and in this embodiment, is a transparent plate-like member that protects each lens group and the concave mirror 45. The projection port 47 may be an optical member such as a lens, and is not limited to the configuration of this embodiment. The aperture stop 46 is disposed between the image display element 32 and the first lens group 41, restricts the light flux that the projection optical system 33 takes in from the image display element 32, and reduces the size of the projection optical system 33. The aperture stop 46 may be provided between the lenses constituting the first lens group 41.

  In the projection optical system 33, when the projection image Pp is focused on the fog screen Sm that is the projection surface, the first lens group 41 is not moved (fixed), and the second lens group 42 and the third lens group 43 are moved. Move them in different amounts. At this time, by moving the second lens group 42 having a positive refractive power and the third lens group 43 having a negative refractive power in the same direction in the optical axis direction of the projection optical system 33, each image position is changed. Enables subtle focusing. This is because when the second lens group 42 is moved alone to the fog screen Sm, the focus position moves in a direction approaching the concave mirror 45, and when the third lens group 43 is moved alone to the fog screen Sm, the focus position is moved. Is moved in a direction away from the concave mirror 45. Thereby, in the projection optical system 33, the focus position in the whole projection image Pp projected on the fog screen Sm can be easily adjusted, and delicate focusing can be performed for each position in the projection image Pp. In addition, in the projection optical system 33, when the focus of the projection image Pp projected on the fog screen Sm is adjusted, the fourth lens group 44 is also moved, so that the distortion that changes for each projection distance can be adjusted. Thereby, the projection optical system 33 can be reduced in size by a non-telecentric projection optical system.

  For this reason, the image projection mechanism 30 drives and controls the image display element 32 (each micromirror thereof) while illuminating the image display element 32 with the light emitted from the light source 34 that has passed through the illumination optical system 31, thereby projecting the image Pp. Form. Further, in the image projection mechanism 30, the formed projection image Pp (projection image light) is reflected by the concave mirror 45 via the refractive optical system (first lens group 41 to fourth lens group 44) of the projection optical system 33. Then, the projection is enlarged and projected from the projection port 47 onto the fog screen Sm. At this time, since the image display element 32 is illuminated with light having no unevenness in the amount of light, the projected image Pp (projected image light) that is an enlarged image also has a uniform illuminance distribution. Thereby, in the image projection mechanism 30, the projection image Pp of uniform illuminance can be enlarged and formed on the fog screen Sm formed by the fog generation mechanism 20. And since the image projection mechanism 30 is an above-described structure, the distance from the projection port 47 to the fog screen Sm which is a projection surface can be 30 cm or less. The image projection mechanism 30 (projection optical system 33) may have another configuration as long as it can form the enlarged projection image Pp on the projection surface (fog screen Sm) even at an extremely small distance. It is not limited to the configuration of the form.

  As shown in FIG. 4, the wind forming mechanism 50 includes a blower 51. The blower 51 is capable of forming an airflow directed toward the air outlet 52 in the airflow guide portion that communicates with the air outlet 52. In this embodiment, a blade portion is rotatably provided in the housing. The The air blower 51 forms an air flow toward the wind outlet 52 when electric power is appropriately supplied from the integrated controller 11. As a result, when the air blowing unit 51 is driven, the wind forming mechanism 50 forms an air flow toward the air outlet 52 in the air flow guide unit, and blows out the wind W in the direction in which the air outlet 52 is directed. . The wind outlet 52 defines the blowing direction Db of the wind W in the direction in which it is directed. In this embodiment, the wind outlet 52 has a cylindrical shape with a rectangular cross section, and is defined in the blowing direction Db of the wind W in the axial direction. (See FIG. 6 and the like). And the wind blower outlet 52 makes the angle with respect to the horizontal direction of the direction (direction orthogonal to the blowing direction Db prescribed | regulated) where the cylindrical wall surface 52a extends as the angle (phi) (refer FIG. 6 etc.) of the wind blower outlet 52 of the angle (phi). It can be changed.

  Moreover, in the wind formation mechanism 50, the suction part 53 and the temperature adjustment part 54 can be provided suitably. The suction part 53 sucks the wind W blown from the wind outlet 52 by the blower part 51 after crossing the projection port 47, and is located on the opposite side of the wind outlet 52 across the projection port 47. It is provided in the airflow guide unit that leads to the suction port 55 (see FIG. 9 and the like). For example, the suction portion 53 is configured by rotatably providing a blade portion on the housing, and forms an air flow that is sucked into the wind suction port 55 when electric power is appropriately supplied from the integrated control portion 11.

  The temperature adjusting unit 54 heats the wind W blown from the air outlet 52 and is provided in the airflow guide unit that leads to the air outlet 52. The temperature adjustment unit 54 generates heat when electric power is appropriately supplied from the integrated control unit 11, and the degree of heat generation (temperature) can be adjusted under the control of the integrated control unit 11. The temperature adjustment unit 54 can switch between driving, i.e., heating the wind W, and stopping driving, i.e., not heating the wind W, based on an operation on the operation unit 13.

  In this spatial image display device 10, water fine particles Fp are ejected from the mist ejection port 23 of the mist generation mechanism 20 to form the mist screen Sm, and the projection is performed from the projection port 47 of the image projection mechanism 30 toward the mist screen Sm. The image Pp is projected. Thereby, in the spatial image display device 10, as shown in FIG. 1 and FIG. 2, it is possible to make the projected image Pp appear to float in the space. In the spatial image display device 10, the image projection mechanism 30 (projection port 47) is directed toward the fog screen Sm formed by the fog generation mechanism 20 (mist spray port 23), but is provided in the vicinity of the projection port 47. The wind W crossing the projection port 47 is blown out from the wind outlet 52 of the wind forming mechanism 50. Thereby, in the spatial image display device 10, the mist fine particles Fp ejected from the mist spray port 23 to form the mist screen Sm are directed toward the projection port 47 directed toward the mist screen Sm. The wind W crossing over is prevented from adhering to the projection port 47.

In the spatial image display device 10 of the present invention, the following conditional expressions (1) to (4) are satisfied. This will be described with reference to FIG. First, the definition of each variable used in conditional expressions (1) to (4) will be described. The velocity of the wind W blown out from the wind outlet 52 on the projection port 47 is v (m / s), and the average particle radius of the mist fine particles Fp ejected from the mist jet port 23 is r (mm). This average particle radius r is obtained by measuring the fog fine particles Fp using a receiving liquid, a glass plate or the like, by obtaining and measuring the fog fine particles Fp after solidifying, the sedimentation method, the momentum method, It can be obtained by a general method, an optical method, a method of observing with a high speed camera, or the like. Moreover, in the projection port 47, the position farthest from the wind outlet 52 when viewed in a horizontal plane including the parallel direction of the projection port 47 and the fog outlet 23 is set as a remote location 47a, and is closest to the wind outlet 52 when viewed from the surface. The position is defined as a proximity location 47b. And the distance in the horizontal direction of the remote location 47a and the wind outlet 52 is set to _Lmax (mm), and the distance in the horizontal direction of the proximity location 47b and the wind outlet 52 is set to _Lmin (mm).

  Furthermore, the distance in the vertical direction between the remote location 47a and the wind outlet 52 based on the lower end position 52b in the vertical direction at the wind outlet 52 is set to Hf (mm) (0 (zero) in the example shown in FIG. 6). . Then, the distance in the vertical direction between the proximity portion 47b and the wind outlet 52 with respect to the lower end position 52b is defined as Hn (mm) (0 (zero) in the example shown in FIG. 6). The distance (thickness of the wind W) in the direction perpendicular to the blowing direction Db of the wind W in the wind W blown from the wind blowing port 52 is d (mm), and the angle of the wind blowing port 52 is φ (°). As described above, the angle φ is an angle with respect to the horizontal direction in the direction in which the cylindrical wall surface 52a of the air outlet 52 extends (the direction perpendicular to the air outlet direction Db defined by the air outlet 52). The angle φ is 0 (zero) when the wind outlet 52 (cylindrical wall surface 52a) is parallel to the horizontal direction (the outlet direction Db is the upper side in the vertical direction), and rotates from that state to the projection outlet 47 side ( The direction of inclination is the positive side.

In each conditional expression, when the angle φ is not 0 ° (zero), the lower limit of the wind speed v is defined by the conditional expression (1) or the conditional expression (2), and the upper limit of the wind speed v is defined by the conditional expression (3). Stipulate. At that time, α is used when {Hf− (L _max / tan φ)} is larger than 0 (zero), and when the value is 0 (zero) or less, α is 0 (zero). To do. Β is used when {Hf− (L _min / tan φ)} is greater than 0 (zero), and is 0 (zero) when the value is 0 (zero) or less. . In each conditional expression, when the angle φ is 0 ° (zero), the upper and lower limits of the wind speed v are defined by the conditional expression (4).

In each of these conditional expressions, the projection image Pp is formed by the generation of noise when the wind W passes through the wind outlet 52 or the generation of noise due to the turbulence of the airflow generated when the blown wind W hits the steps or protrusions. The upper limit of the wind speed v is determined from the viewpoint of preventing the environment of the place where it is uncomfortable. In this embodiment, the upper limit of the wind speed v is 15 (m / s). Further, in each conditional expression, a lower limit is determined from the viewpoint of enabling the fine particles Fp falling from the fog screen Sm to be blown off to a position other than on the projection port 47. Conditional expressions (1) and (2) that define the lower limit will be described. In the conditional expressions (1) and (2), since L _max (remote location 47a) and L _min (proximity location 47b) are interchanged, the description will be basically made using conditional expression (1).

  In conditional expression (1), the lower limit of the wind speed v is defined so that the fine particles Fp can be transported to the position beyond the remote location 47a of the projection port 47 by the wind W from the wind outlet 52. Conditional expression (2) is also used in combination with a condition that exceeds the remote location 47a of the projection port 47 and a condition that exceeds the proximity location 47b of the projection port 47 depending on the positional relationship of the wind outlet 52 with respect to the projection port 47. It depends on which of which will become larger. For this reason, it is possible to prevent the fine particles Fp from adhering over the entire area of the projection port 47 by satisfying both the conditional expression (1) and the conditional expression (2) (adopting the larger lower limit). In other words, the conditional expression (1) defines the minimum wind speed v required for the fine particles Fp to pass over the remote location 47 a of the projection port 47, and the conditional expression (2) indicates the proximity location 47 b of the projection port 47. The minimum wind speed v required for the fine particles Fp to pass above is defined. In order to define this lower limit, the average particle radius r of the fine particles Fp of the mist (water) falling off the mist screen Sm and falling near the projection port 47, the positional relationship of the mist injection port 23 with respect to the projection port 47, and the wind blowing The size of the outlet 52 and the blowing direction Db which is the direction of the wind W from the wind blowing outlet 52 are used. And in conditional expression (1), the distance d (thickness) of the wind W in the direction orthogonal to the blowing direction Db of the wind W is used as the size of the wind blowing port 52, and the blowing direction 52 is used as the blowing direction Db. The angle φ is used.

  First, since the fine particle Fp receives the wind W in the area viewed in the blowing direction Db of the wind W, the change in the moving distance due to the wind W is proportional to the square of the radius. Here, in the fine particle Fp, the specific surface area increases as the diameter, that is, the size decreases. Further, since the fine particles Fp are affected by the wind W by passing through the region where the wind W is formed, the size dimension y in the vertical direction (gravity direction) of the wind W is a change in the movement distance due to the wind W. To affect. Furthermore, since the fine particles Fp basically drop in the direction of gravity (vertically in the lower direction), the presence / absence of the direction of the wind W in the reverse direction of gravity (upward in the vertical direction) affects the change in the travel distance by the wind W. give. The fine particles Fp exist when the wind outlet 52 and the projection port 47 are at the same horizontal position, and the wind W from the wind outlet 52 is blown in the horizontal direction without hitting the projection port 47 (α = 0 and β = 0) may be affected by the wind W so that it can pass over the remote location 47a (proximity location 47b) while the wind W falls by the size y in the vertical direction (gravity direction). And when the wind outlet 52 and the projection outlet 47 do not exist in the same horizontal position, the amount of the fine particles Fp falls according to the amount of displacement. In particular, when a part of the wind W hits the projection port 47 (α> 0 or β> 0), in the fine particle Fp, the vertical direction (gravity direction) of the wind W is between the distance 47a (proximity location 47b). ) Is subtracted by α (or β) from the size dimension y. For this reason, the fine particles Fp are not affected by the wind W so that they can pass over the remote location 47a (or the proximity location 47b) while falling by (y−α) (or (y−β)). Don't be.

As a premise to obtain the conditional expression (1) in consideration of these things, the fine particles Fp have a spherical shape, and the terminal velocity V (m / s) (the force acting by gravity and the vacancy resistance without changing the shape). ) Is assumed to fall in the air at the equilibrium (equal speed motion) and enter the wind W. The mass of the fine particle Fp is m (kg), the acceleration of gravity is g (m / s ² ), the viscosity coefficient of the fluid (air) is μ (Pa · s), and the radius of the fine particle Fp is r (mm). The density of the fine particles Fp is ρp (kg / m ³ ), and the density of the fluid (air) is ρ (kg / m ³ ). They define the Reynolds number Re (Re = (2 × r × V × ρ) / μ). The terminal velocity V can be obtained by the following equation (5) when the Reynolds number Re affected by the diameter of the spherical fine particle Fp is 10 or less (Re ≦ 10).

Here, since the fine particles Fp are water, the density ρp is 1000 (kg / m ³ ). Further, since the fine particles Fp move in the air, the viscosity coefficient μ of the fluid (air) is 18.2 × 10 ⁻⁶ (Pa · s) using the numerical value under the standard atmospheric pressure, and the density ρ is 1 .18 (kg / m ³ ). Furthermore, the gravitational acceleration g is 9.81 (m / s ² ). When these numerical values are used, the terminal velocity V is approximately (120 × r ² ) from the equation (5).

Here, the angle of the wind W blowing direction Db to the upper side in the vertical direction with respect to the horizontal direction is defined as θ (°). When the fine particle Fp falling in the air at the terminal velocity V enters the wind W at the wind velocity v (m / s), the fall velocity V ′ in the wind W is (V ′ = V−v × sin θ = V−v × cos φ). The fine particles Fp are advanced in the horizontal direction with a horizontal component of the wind speed v of the wind W (v × cos θ = v × sin φ). The fine particle Fp advances in the horizontal direction so as to pass over the remote location 47a before falling by (y−α) ((α = 0 (zero) in the example shown in FIG. 6)) in the vertical direction. Just go. The horizontal advance amount, that is, the horizontal distance, requires that the fine particles Fp existing at the upper end position of the wind outlet 52 at the maximum pass through the remote location 47a, and therefore the horizontal distance “L _max between the remote location 47a and the wind outlet 52”. ”And the horizontal distance“ d × cos φ ”between the lower end position 52b and the upper end position 52c of the wind outlet 52 in accordance with the angle φ of the wind outlet 52. From these facts, the following expression (6) indicating that the time for the fine particle Fp to fall in the vertical direction (y−α) is longer than the time for the fine particle Fp to advance by the horizontal distance “L _max + d × cos φ”. ), The fine particles Fp can be transported by wind W to a position beyond the remote location 47a.

  By developing this equation (6) using the terminal velocity V described above, the above-described conditional equation (1) is obtained. Similarly, the conditional expression (2) described above is obtained.

Conditional expression (4) shows a case where the angle φ of the wind outlet 52 is 0 °, that is, the blowing direction Db of the wind W is on the upper side in the vertical direction. In such a case, for example, the setting is made as in a spatial image display device 10F (see FIGS. 22 and 23) of Example 6 described later. Here, in the conditional expressions (1) and (2), when the angle φ is 0 °, the size dimension y in the vertical direction (gravity direction) of the wind W is infinite and is not established. It is assumed that there is a finite number. And when the blowing direction Db of the wind W is on the upper side in the vertical direction, when the wind speed v becomes equal to or higher than the terminal velocity V described above, the fine particles Fp do not fall into the projection port 47, so the lower limit is set to the terminal velocity V (= 120). Xr ² ). For this reason, when the angle φ of the wind outlet 52 is 0 °, the wind speed v is defined by the conditional expression (4).

  In the spatial image display device 10, the average particle radius r of the fine particles Fp of the mist injected from the mist injection port 23 of the mist generation mechanism 20 is obtained, and the positional relationship of the wind outlet 52 with respect to the projection port 47 is used for each condition. The wind speed v on the projection port 47 is obtained from the equation. In the spatial image display device 10, the blower 51 of the wind forming mechanism 50 is driven so that the wind speed v of the wind W on the projection port 47 is obtained. As a result, the spatial image display device 10 can prevent the fog fine particles Fp from adhering to the projection port 47. In addition, in the spatial image display device 10, when the suction portion 53 is used together as described later, the strength of the wind W formed by the blower portion 51 (wind formation mechanism 50) is the strength of the airflow sucked by the suction portion 53. It is desirable to set according to. At this time, the suction portion 53 may set the strength of the airflow to be sucked in accordance with the air velocity v of the wind W obtained at the projection port 47 in cooperation with the air blowing portion 51 of the wind forming mechanism 50. .

  As described above, in the spatial image display device 10 according to the embodiment of the spatial image display device according to the present invention, the wind W crossing the projection port 47 of the image projection mechanism 30 is blown from the wind outlet 52 of the wind formation mechanism 50. For this reason, in the spatial image display device 10, the fine particles Fp ejected from the mist ejection port 23 to form the mist screen Sm are directed on the projection port 47 even toward the projection port 47 directed toward the mist screen Sm. It can prevent adhering to the projection port 47 by the crossing wind W. Thereby, in the spatial image display apparatus 10, scattering of the projection image Pp (projection image light) resulting from the adhesion of the fine particles Fp to the projection port 47 can be prevented, and the image formation mechanism of the image projection mechanism 30 is deteriorated. A decrease in the brightness of the projected image Pp on the fog screen Sm can be prevented.

  In the spatial image display device 10, a wind outlet 52 is provided between the projection port 47 and the fog outlet 23, and the wind W is blown out from the wind outlet 52 toward the projection port 47. For this reason, in the spatial image display device 10, the wind W blown out from the wind outlet 52 is directed to the opposite side of the fog screen Sm (mist injection port 23), so that the fog screen Sm can be prevented from being disturbed by the wind W. Therefore, it is possible to continue to form a projection image Pp that is high quality and appears floating in the space.

  Further, in the spatial image display device 10, the image projection mechanism 30 includes an illumination optical system 31 that guides light from the light source 34 as illumination light, an image display element 32 that forms a projection image Pp by the illumination light, and a projection image thereof. A projection optical system 33 for projecting Pp on the fog screen Sm. For this reason, in the spatial image display apparatus 10, since the image projection mechanism 30 and the fog generating mechanism 20 can be arranged very close to each other, they can be integrated while achieving miniaturization. In particular, in the spatial image display device 10, since the image projection mechanism 30 can set the distance from the projection port 47 to the fog screen Sm that is the projection surface to be 30 cm or less, the projection port 47 is the fog screen Sm (mist spray port). 23). For this reason, in the spatial image display apparatus 10, even if the image projection mechanism 30 and the fog generation mechanism 20 are provided integrally, the entire apparatus can be extremely miniaturized. Here, in the spatial image display device 10, it is possible to prevent the fine particles Fp from adhering to the projection port 47 by blowing the wind W from the wind outlet 52 toward the projection port 47. Can form a good projection image Pp on the fog screen Sm. For this reason, in the spatial image display device 10, it is possible to reduce the space occupied while facilitating carrying and installation, and it is possible to form a good projection image Pp while improving usability. Therefore, the spatial image display device 10 can be used in a limited space and can be used in various scenes such as effective presentation and digital signage, or at home.

  In the spatial image display device 10, the projection image Pp is projected from the image projection mechanism 30 (projection port 47) onto the fog screen Sm formed in the space by ejecting water fine particles Fp from the mist ejection port 23 of the mist generation mechanism 20. To do. For this reason, the spatial image display device 10 can make the projected image Pp appear to float in an empty space, and an unprecedented expression is possible due to the illusion of fog. In addition, since the spatial image display device 10 ejects the water fine particles Fp into the space, it can have a function as a beauty steamer or a humidifier. In particular, since the spatial image display device 10 can be integrated while reducing the size, the demand as a beautiful face steamer or a humidifier can be captured. For this reason, the spatial image display device 10 can enjoy the projected image Pp in a general home and pursue beauty by skin care and prevention of dryness, and can provide a product value that is not limited to a simple image display device. it can.

  Since the spatial image display device 10 satisfies the conditional expressions (1) to (4), the spatial image display device 10 falls from the fog screen Sm while suppressing noise caused by the wind W from the wind forming mechanism 50 (the wind outlet 52). The coming fine particles Fp can be reliably blown off by the wind W to a position other than on the projection port 47. For this reason, in the spatial image display device 10, the fine particles Fp ejected from the mist ejection port 23 can be reliably prevented from adhering to the projection port 47, and a high-quality projection image Pp can be formed in a more comfortable environment. .

  In the spatial image display device 10, the temperature of the wind W blown from the wind outlet 52 can be adjusted by providing the temperature adjusting unit 54 in the wind forming mechanism 50. For this reason, in the spatial image display device 10, the temperature of the wind W blown from the wind outlet 52 can be raised to evaporate the fine particles Fp that have fallen from the fog screen Sm. Prevention of adhesion can be made more reliable. Further, in the spatial image display device 10, by adjusting the temperature of the wind W to a comfortable temperature, the usability when used as a beautiful face steamer or a humidifier can be improved, and the effect of skin care or drying prevention can be improved. Can be increased.

  In the spatial image display device 10, the blowing direction Db of the wind W blown from the wind outlet 52 in the wind forming mechanism 50 can be changed. For this reason, in the spatial image display device 10, the blowing direction Db of the wind W can be adjusted according to the surrounding environment or the like so that the fine particles Fp falling from the fog screen Sm do not adhere to the projection port 47, and the projection port 47 can be more reliably prevented. Further, in the spatial image display device 10, since the direction in which the mist is jetted can be adjusted by directing the wind W toward the mist jet port 23, it is possible to improve the usability when using it as a facial steamer or a humidifier, The effect of skin care or dryness prevention can be enhanced. This can be made more effective by providing the wind forming mechanism 50 together with the temperature adjusting unit 54.

  In the spatial image display device 10, it is possible to change the injection direction of the mist that is injected from the mist injection port 23 in the mist generation mechanism 20. For this reason, in the spatial image display device 10, the position and angle of the fog screen Sm can be changed according to the usage environment and the condition of the projection image Pp, and it is possible to form a better projection image Pp while improving usability. It can be. In addition, since the direction in which the mist is jetted can be adjusted in the spatial image display device 10, it is possible to improve the usability when used as a beautiful face steamer or a humidifier, and to enhance the effect of skin care or dry prevention. it can.

  Therefore, in the spatial image display device 10 of the embodiment as the spatial image display device according to the present invention, it is possible to prevent fog from adhering to the projection port 47.

  In the spatial image display device 10, the fine particles Fp ejected from the mist ejection port 23 are generated by the projection port 47 as long as the wind W crossing the projection port 47 is formed so as to cover the projection port 47 over the entire area. Can be prevented. For this reason, the positional relationship of the wind outlet 52 with respect to the projection port 47 is not limited to the above-described embodiment, and can be set as appropriate. An example of a wind forming mechanism having another configuration (a spatial image display device including the same) will be described with reference to FIGS. 7 to 10 have the same basic concept and configuration as those of the spatial image display device 10 according to the embodiment described above. Therefore, the same reference numerals are used to denote the same concept and configuration. Detailed description thereof will be omitted. Each of the configurations shown in FIGS. 7 to 10 is basically the same as the configuration of the spatial image display device 10 of the above-described embodiment, so that basically the same effects as those of the embodiment can be obtained. .

  In the spatial image display device 101 (the wind forming mechanism 501) shown in FIG. 7, the air outlet 521 is provided in an oblique direction with respect to the projection port 47 (the parallel direction of the projection port 47 and the mist injection port 23). The wind outlet 521 can cover the entire area of the projection port 47 viewed obliquely with respect to the size dimension (width dimension) in the width direction orthogonal to the blowing direction Db of the blowing wind W. In this spatial image display device 101 (wind formation mechanism 501), the wind W blown from the wind outlet 521 is directed to the opposite side of the fog screen Sm (mist injection port 23), so that the fog screen Sm is disturbed by the wind W. Can be prevented. Further, in the spatial image display device 101 (wind formation mechanism 501), since the wind outlet 521 is provided in an oblique direction with respect to the projection port 47 having a rectangular shape in front view of FIG. 7, the width dimension of the wind outlet 521 is provided. Can be made smaller than the long side of the projection port 47.

  In the spatial image display device 102 (wind formation mechanism 502) shown in FIG. 8, the wind outlet 522 is provided in a direction orthogonal to the projection port 47 (the parallel direction of the projection port 47 and the mist injection port 23). . The air blowout port 522 has a size (width size) in the width direction of the blown air W larger than the short side of the projection port 47 having a rectangular shape. In this spatial image display device 102 (wind formation mechanism 502), the wind W blown from the wind outlet 522 is directed in a different direction from the fog screen Sm (mist injection port 23), so that the fog screen Sm is disturbed by the wind W. Can be prevented. Further, in the spatial image display device 102 (wind formation mechanism 502), the wind outlet 522 is provided in a direction orthogonal to the rectangular projection port 47 (the parallel direction of the projection port 47 and the fog spray port 23). The width of the air outlet 522 can be made close to the short side of the projection port 47.

  In the spatial image display device 103 (wind formation mechanism 503) shown in FIG. 9, a wind outlet 523 is provided on the opposite side of the mist injection port 23 as viewed from the projection port 47. Further, in the spatial image display device 103, a wind suction port 55 is provided as a wind forming mechanism 503 between the projection port 47 and the fog spray port 23 (on the opposite side of the projection port 47 as viewed from the wind outlet 523). A windbreak wall 61 is provided between the wind inlet 55 and the fog outlet 23. The wind suction port 55 communicates with the airflow guide section provided with the above-described suction section 53 (see FIG. 4), and the suction section 53 can be driven to suck in ambient air. For this reason, in the wind formation mechanism 503, while the wind W which crosses toward the fog screen Sm (mist injection port 23) side on the projection port 47 from the wind blower outlet 523 is formed, the wind W is sucked in by the wind suction port 55. Can do. Further, the wind forming mechanism 503 can prevent the wind W from reaching the fog screen Sm (the fog injection port 23) by the windbreak wall 61 even when the wind suction port 55 cannot suck all the wind W, and the fog screen Sm can be prevented from being disturbed. For this reason, in the spatial image display device 103 (wind formation mechanism 503), the wind W crossing the projection port 47 can be a stable air flow, and the fine particles Fp forming the fog screen Sm adhere to the projection port 47. Can be prevented more reliably. Further, in the spatial image display device 103 (wind formation mechanism 503), it is possible to prevent the wind W from moving in an unintended direction while increasing the degree of freedom of the setting position of the wind outlet 523, and the fine particles Fp adhere to the projection port 47. This can be prevented more appropriately.

  In the spatial image display device 104 (wind formation mechanism 504) shown in FIG. 10, an air outlet 524 having a width smaller than the long side of the projection port 47 is provided between the projection port 47 and the mist injection port 23. A wind suction port 554 is provided on the opposite side of the projection port 47 when viewed from the wind blow port 524. The wind suction port 554 has a width dimension in which the projection port 47 is positioned inward of a trapezoid having the bottom as it is and the wind outlet 524 as an upper bottom when the front view of FIG. 10 is viewed. For this reason, in the wind formation mechanism 503, while the wind W which crosses over the whole region on the projection port 47 from the wind blower outlet 523 can be formed, the wind W can be sucked in by the wind inlet 554. In this spatial image display device 104 (wind formation mechanism 504), since the wind W crossing the projection port 47 can be sucked by the wind suction port 554, the wind W can be made a stable air flow, and the wind W It is possible to prevent heading in an unintended direction. In the spatial image display device 104 (wind formation mechanism 504), the wind W blown from the wind outlet 524 is directed to the opposite side of the fog screen Sm (mist injection port 23), so that the fog screen Sm is disturbed by the wind W. Can be prevented. Further, in the spatial image display device 104 (wind formation mechanism 504), the projection port 47 is positioned in the trapezoidal interior with the wind suction port 554 as the bottom and the wind port 524 as the upper bottom. While making the width dimension of 524 smaller than the long side of the projection port 47, the wind W crossing the projection port 47 over the entire region can be formed. In the spatial image display device 104 (wind formation mechanism 504), it is possible to prevent the wind W from being directed in an unintended direction while increasing the degree of freedom of the setting position of the air outlet 524, and the fine particles Fp are prevented from adhering to the projection port 47. It can be prevented more appropriately. In the spatial image display device 104 (wind formation mechanism 504), the wind suction port 554 is a lower bottom and the wind outlet 524 is an upper bottom, but the wind suction port 554 is an upper bottom and the wind outlet 524 is a lower bottom. The present invention is not limited to the example shown in FIG. Further, in the spatial image display device 104 (wind formation mechanism 504), the wind suction port 554 is provided. However, if the divergent wind W as shown in FIG. The crossing wind W can be formed, and the wind inlet 554 may not be provided.

  Note that the air suction ports (55, 554) are provided in the spatial image display device 103 (wind formation mechanism 503) and the spatial image display device 104 (wind formation mechanism 504). ), A wind suction port may be provided on the opposite side across the projection port 47. With such a configuration, the wind W can be a stable air flow, the degree of freedom of the setting position of the wind outlet can be increased, and the mist screen Sm can be more reliably prevented from being disturbed by the wind W. And it can prevent that the wind W goes to the direction which is not intended. Further, the windshield wall 61 is provided in the spatial image display device 103 (wind formation mechanism 503). However, in other examples, the windbreak is seen in front of the fog screen Sm (mist spray port 23) when viewed from the wind outlet (52, etc.). A wall may be provided. With such a configuration, it is possible to more reliably prevent the fog screen Sm from being disturbed by the wind W.

  In each spatial image display device (10, 101, 102, 103, 104), the fog generating mechanism 20 forms a flat fog screen Sm, and the image projection mechanism 30 projects a projection image Pp on the fog screen Sm. doing. However, the mist generation mechanism 20 may have other configurations as long as it forms a projection surface (fog screen Sm) by injecting mist from the mist injection port 23, and is not limited to the above-described configurations. As an example, the mist generation mechanism 20 may inject mist in a columnar shape from the mist injection port 23 or a plurality of locations at different distances when viewed from the projection port 47 of the image projection mechanism 30 (when a plurality are arranged at equal distances). A three-dimensional projection surface may be formed by selectively injecting a plate-like or columnar mist. In this case, in the spatial image display device, the image projection mechanism 30 changes the aspect (focus position, size, etc.) of the projection image Pp projected according to the distance from the projection port 47 to each position on the projection surface. The projected image Pp can be three-dimensionally displayed (three-dimensionally displayed) in the space. In this spatial image display device, since the projection image Pp is projected onto a three-dimensional projection surface, it is possible to prevent a sense of incongruity and eye fatigue as compared with a pseudo three-dimensional display using parallax, and a polarizing filter Or, it is possible to give a stereoscopic effect while maintaining a completely natural body without using glasses for separately acquiring left and right images. In addition, since this spatial image display device has less restrictions on the field of view and resolution as compared with holography, a more beautiful and realistic three-dimensional display (stereoscopic display) is possible.

  Next, a spatial image display device 10A of Example 1 as an example of a specific configuration of the spatial image display device according to the present invention will be described with reference to FIGS. Since the basic concept and configuration of the spatial image display device 10A of Example 1 are the same as those of the spatial image display device 10 of the above-described embodiment, the same reference numerals are given to the same concept and configuration portions. Detailed description thereof is omitted. In addition, the spatial image display device 10A according to the first embodiment basically has the same configuration as that of the spatial image display device 10 according to the above-described embodiment, and thus basically obtains the same effects as those of the above-described embodiment. Can do.

  In the spatial image display device 10A according to the first embodiment, as illustrated in FIG. 11, the mist injection port 23 is provided on the first upper surface 62, and the mist injection is performed on the second upper surface 63 above the first upper surface 62 and parallel to the horizontal plane. A wind outlet 52A, a projection port 47, and a wind suction port 55 are provided in this order from the mouth 23 (first upper surface 62) side. In the spatial image display device 10A, as shown in FIGS. 11 and 12, the air outlet 52A is largely inclined toward the projection port 47 (wind inlet 55), and the angle φ of the air outlet 52A is 75 ° (FIG. 13). In the spatial image display device 10A, the values of the variables are shown in FIG. 12 and Table 1 below. Here, in the spatial image display device 10A, as shown in FIG. 13, since the wind W does not overlap with the projection port 47, α and β become 0 (zero), and the wind outlet 52A and the projection port 47 are connected to the second upper surface. Hf and Hn are also 0 (zero).

[Table 1]

In this spatial image display device 10A, since the angle φ is 75 ° and not 0 (zero), conditional expressions (1) to (3) are used. In this spatial image display device 10A, since the wind W does not hit the projection port 47, the fine particles Fp are distant from the wind outlet 52A while falling by the size y in the vertical direction (gravity direction) of the wind W. It is necessary to move by a distance “L _max + d × cos φ” in the horizontal direction up to 47a (conditional expression (1)). Further, in the spatial image display device 10A, since the wind W does not hit the projection port 47, the fine particles Fp approach from the wind outlet 52A while falling by the size y in the vertical direction (gravity direction) of the wind W. It is necessary to move by a distance “L _min + d × cos φ” in the horizontal direction to the location 47b (conditional expression (2)). From each value in Table 1, the conditional expression (1) becomes “0.19 ≦ v”, and the conditional expression (2) becomes “0.17 ≦ v”. For this reason, in the spatial image display device 10A, the wind speed v (m / s) of the wind W crossing the projection port 47 under the conditions of the values shown in Table 1 is “0.19 ≦ v ≦ 15”. By setting the formation mechanism 50 </ b> A (the air blowing portion 51 (the strength of the wind W formed there)), the fine particles Fp can be prevented from adhering to the projection port 47. In this spatial image display device 10A, since the wind outlet 52A is directed upward with respect to the horizontal direction, the wind W acts to prevent the particulates Fp from falling, so that the smaller the angle φ, the larger the particulates Fp. Buoyancy can be applied. For this reason, in the spatial image display device 10 </ b> A, the fine particles Fp can be prevented from adhering to the projection port 47 with a lower wind speed v as the angle φ decreases.

  Next, a spatial image display device 10B of Example 2 as an example of a specific configuration of the spatial image display device according to the present invention will be described with reference to FIGS. 14 and 15. Since the basic concept and configuration of the spatial image display device 10B of Example 2 are the same as those of the spatial image display device 10 of the above-described embodiment, the same reference numerals are given to the same concept and configuration. Detailed description thereof is omitted. The spatial image display device 10B according to the second embodiment basically has the same configuration as that of the spatial image display device 10 according to the above-described embodiment, and thus basically obtains the same effects as those of the above-described embodiment. Can do.

  In the spatial image display device 10B of the second embodiment, the overall arrangement relationship is the same as that of the spatial image display device 10A (see FIG. 11) of the first embodiment, and as shown in FIGS. The configuration is different. The air outlet 52B is provided at a position protruding upward from the second upper surface 63, and is greatly inclined toward the projection port 47 (wind inlet 55) so that the wind W does not overlap the projection port 47, The angle φ is 105 °. That is, the air outlet 52B has a configuration in which the angle with respect to the horizontal direction is made equal to that from the upper side to the lower side as compared with the air outlet 52 of the first embodiment. In the spatial image display device 10B, the values of the variables are shown in FIG. 15 and Table 2 below. Here, in the spatial image display device 10 </ b> B, since the wind W does not overlap the projection port 47, α and β are 0 (zero), and the wind outlet 52 </ b> B is provided above the projection port 47 on the second upper surface 63. Therefore, Hf and Hn are smaller than 0 (zero).

[Table 2]

In this spatial image display device 10B, since the angle φ is 105 ° and not 0 (zero), conditional expressions (1) to (3) are used. In this spatial image display device 10B, since the wind W does not hit the projection port 47, the fine particles Fp are distant from the wind outlet 52B while falling by the size y in the vertical direction (gravity direction) of the wind W. It is necessary to move by a distance “L _max + d × cos φ” in the horizontal direction up to 47a (conditional expression (1)). Further, in the spatial image display device 10B, since the wind W does not hit the projection port 47, the fine particles Fp approach the wind outlet 52B while falling by the size y in the vertical direction (gravity direction) of the wind W. It is necessary to move by a distance “L _min + d × cos φ” in the horizontal direction to the location 47b (conditional expression (2)). From the respective values in Table 2, the conditional expression (1) becomes “10.16 ≦ v”, and the conditional expression (2) becomes “2.14 ≦ v”. For this reason, in the spatial image display device 10B, the wind speed v (m / s) of the wind W crossing the projection port 47 under the conditions of the values in Table 2 is “10.16 ≦ v ≦ 15”. By setting the formation mechanism 50 </ b> B (the air blowing portion 51 (the strength of the wind W formed there)), the fine particles Fp can be prevented from adhering to the projection port 47. In this spatial image display device 10B, since the air outlet 52B is directed downward with respect to the horizontal direction, the wind W also acts to increase the falling speed of the fine particles Fp. Thus, it is necessary to increase the wind speed v of the wind W as compared with the spatial image display device 10A on the upper side.

  Next, a spatial image display device 10C of Example 3 as an example of a specific configuration of the spatial image display device according to the present invention will be described with reference to FIGS. Since the basic concept and configuration of the spatial image display device 10C of Example 3 are the same as those of the spatial image display device 10 of the above-described embodiment, the same reference numerals are given to the same concept and configuration. Detailed description thereof is omitted. In addition, the spatial image display device 10C according to the third embodiment basically has the same configuration as that of the spatial image display device 10 according to the above-described embodiment, and thus basically obtains the same effects as those of the above-described embodiment. Can do.

  In the spatial image display device 10C of the third embodiment, the overall arrangement relationship is the same as that of the spatial image display device 10A (see FIG. 11) of the first embodiment, and as shown in FIGS. 16 and 17, an image projection mechanism 30C. The configuration of the projection port 47C is different. The projection port 47C is provided at a position protruding upward from the second upper surface 63, the height of the remote location 47a farthest from the air outlet 52C from the second upper surface 63 is 25 (mm), and the air outlet 52C. The height from the second upper surface 63 of the adjacent portion 47b closest to is 45 (mm). Accordingly, in the projection port 47C, the vicinity of the proximity portion 47b overlaps the wind W from the wind outlet 52C, and the angle φ of the wind outlet 52C is 80 °. In the spatial image display device 10C, the values of the variables are shown in FIG. 17 and Table 3 below. Here, in the spatial image display device 10C, since the wind W does not overlap the remote location 47a of the projection port 47C, α is 0 (zero), and since the wind W overlaps the adjacent location 47b of the projection port 47C, β is 0 ( Greater than zero). Further, in the spatial image display device 10C, since the projection port 47C is provided above the air outlet 52C on the second upper surface 63, Hf and Hn are larger than 0 (zero).

[Table 3]

In this spatial image display device 10C, since the angle φ is 80 ° and not 0 (zero), conditional expressions (1) to (3) are used. In this spatial image display device 10C, since the wind W does not hit the remote location 47a of the projection port 47C, the fine particles Fp fall while the size W in the vertical direction (gravity direction) of the wind W falls. It is necessary to move by a distance “L _max + d × cos φ” in the horizontal direction from 52C to the remote location 47a (conditional expression (1)). Further, in the spatial image display device 10C, since the wind W hits the adjacent portion 47b of the projection port 47C, the fine particle Fp subtracts β, which is an overlap amount, from the size y in the vertical direction (gravity direction) of the wind W. While falling by the value “y−β”, it is necessary to move by a distance “L _min + d × cos φ” in the horizontal direction from the air outlet 52C to the adjacent portion 47b (conditional expression (2)). From each value in Table 3, conditional expression (1) becomes “0.89 ≦ v”, and conditional expression (2) becomes “1.48 ≦ v”. For this reason, in the spatial image display device 10C, the wind speed v (m / s) of the wind W crossing the projection port 47C under the conditions of each value in Table 3 is “1.48 ≦ v ≦ 15”. By setting the forming mechanism 50C (the air blowing part 51 (the strength of the wind W formed there)), the fine particles Fp can be prevented from adhering to the projection port 47C.

  Next, a spatial image display device 10D of Example 4 as an example of a specific configuration of the spatial image display device according to the present invention will be described with reference to FIGS. The spatial image display device 10D of Example 4 has the same basic concept and configuration as the spatial image display device 10 of the above-described embodiment. Detailed description thereof is omitted. In addition, the spatial image display device 10D according to the fourth embodiment basically has the same configuration as that of the spatial image display device 10 according to the above-described embodiment, and thus basically obtains the same effects as those of the above-described embodiment. Can do.

In the spatial image display device 10D according to the fourth embodiment, as illustrated in FIG. 18, the first upper surface 62 is provided with the mist injection port 23 and the wind outlet 52D, and the second upper surface parallel to the horizontal plane above the first upper surface 62. A wind suction port 55 is provided on the upper surface 63, and a projection port 47D of the image projection mechanism 30D is provided at an intermediate position of the vertical surface 64 rising in the vertical direction between the first upper surface 62 and the second upper surface 63. In the spatial image display device 10D, as shown in FIG. 19, the wind outlet 52D is inclined toward the projection port 47 (vertical surface 64) so as not to overlap the projection port 47, and the angle φ of the wind outlet 52D Is 20 °. In the spatial image display device 10D, the values of the variables are shown in FIG. 19 and Table 4 below. Here, in the spatial image display device 10D, since the wind W does not overlap with the projection port 47, α and β are 0 (zero). Further, in the spatial image display device 10D, since the projection port 47D is provided at an intermediate position of the vertical surface 64 rising from the second upper surface 63 where the wind outlet 52D is located, Hf and Hn are larger than 0 (zero), The distance from the wind outlet 52D to the projection 47D seen in the horizontal direction is constant, and L _max and L _min are equal.

[Table 4]

In this spatial image display device 10D, since the angle φ is 20 ° and not 0 (zero), conditional expressions (1) to (3) are used. In this spatial image display device 10D, since the wind W does not hit the projection port 47, the fine particles Fp are distant from the wind outlet 52D while falling by the size y in the vertical direction (gravity direction) of the wind W. It is necessary to move by a distance “L _max + d × cos φ” in the horizontal direction to the location 47a (conditional expression (1)). Further, in the spatial image display device 10D, since the wind W does not hit the projection port 47, the fine particles Fp pass through the wind outlet 52D while falling by the size y in the vertical direction (gravity direction) of the wind W. It is necessary to move by a distance “L _min + d × cos φ” in the horizontal direction to the adjacent portion 47b (conditional expression (2)). From each value in Table 4, the conditional expression (1) becomes “0.61 ≦ v”, and the conditional expression (2) becomes “0.61 ≦ v”. For this reason, in the spatial image display device 10D, the wind speed v (m / s) of the wind W crossing the projection port 47 under the conditions of the values shown in Table 4 is “0.61 ≦ v ≦ 15”. By setting the formation mechanism 50 </ b> D (the air blowing part 51 (the strength of the wind W formed there)), the fine particles Fp can be prevented from adhering to the projection port 47.

  Next, a spatial image display device 10E of Example 5 as an example of a specific configuration of the spatial image display device according to the present invention will be described with reference to FIGS. 20 and 21. FIG. Since the basic concept and configuration of the spatial image display device 10E of Example 5 are the same as those of the spatial image display device 10 of the above-described embodiment, the same reference numerals are given to portions having the same concept and configuration, Detailed description thereof is omitted. In addition, since the spatial image display device 10E of Example 5 has basically the same configuration as the spatial image display device 10 of the above-described embodiment, the same effects as those of the above-described embodiment can be basically obtained. Can do.

In the spatial image display device 10E of the fifth embodiment, the overall arrangement relationship is the same as that of the spatial image display device 10D (see FIG. 18) of the fourth embodiment, and as shown in FIG. 20 and FIG. The position and angle are different from the configuration of the projection port 47E of the image projection mechanism 30E. The wind outlet 52E is inclined toward the projection port 47E (vertical surface 64) so that the wind W overlaps the projection port 47E provided on the vertical surface 64, and the angle φ is 10 °. The projection port 47E protrudes in the horizontal direction from the vertical surface 64 toward the air outlet 52E, and its protruding end surface 47c is parallel to the vertical surface 64, and the protruding end surface 47c is more horizontal than the lower end position 52b of the air outlet 52. Protrudes in the direction. For this reason, since the distance in the horizontal direction of the remote location 47a and the proximity location 47b with respect to the lower end position 52b is equal to each other, L _max and L _min are equal to each other, and they are smaller than 0 (zero). In the spatial image display device 10E, the values of the variables are shown in FIG. 21 and Table 5 below. Here, in the spatial image display device 10E, since the wind W overlaps with the projection port 47E, α and β are larger than 0 (zero), and the wind outlet 52E is provided above the projection port 47E on the second upper surface 63. Therefore, Hf and Hn are also larger than 0 (zero).

[Table 5]

In this spatial image display device 10E, since the angle φ is 10 ° and not 0 (zero), conditional expressions (1) to (3) are used. In this spatial image display device 10E, since the wind W strikes the remote location 47a of the projection port 47E, the fine particle Fp is a value obtained by subtracting α, which is an overlap amount, from the size y in the vertical direction (gravity direction) of the wind W. While falling by “y−α”, it is necessary to move by a distance “L _max + d × cos φ” in the horizontal direction from the wind outlet 52E to the remote location 47a (conditional expression (1)). Further, in the spatial image display device 10E, since the wind W hits the proximity portion 47b of the projection port 47E, the fine particle Fp subtracts β, which is an overlap amount, from the size y in the vertical direction (gravity direction) of the wind W. While falling by the value “y−β”, it is necessary to move by the distance “L _min + d × cos φ” in the horizontal direction from the air outlet 52E to the adjacent location 47b (conditional expression (2)). From each value in Table 5, the conditional expression (1) becomes “0.58 ≦ v”, and the conditional expression (2) becomes “0.49 ≦ v”. For this reason, in the spatial image display device 10E, the wind speed v (m / s) of the wind W crossing the projection port 47E under the conditions of the values shown in Table 5 is “0.58 ≦ v ≦ 15”. By setting the forming mechanism 50E (the air blowing part 51 (the strength of the wind W formed there)), the fine particles Fp can be prevented from adhering to the projection port 47E.

  Next, a spatial image display device 10F of Example 6 as an example of a specific configuration of the spatial image display device according to the present invention will be described with reference to FIGS. The spatial image display device 10F of Example 6 has the same basic concept and configuration as the spatial image display device 10 of the above-described embodiment. Detailed description thereof is omitted. In addition, the spatial image display device 10F of Example 6 has basically the same configuration as the spatial image display device 10 of the above-described embodiment, and thus basically obtains the same effects as those of the above-described embodiment. Can do.

In the spatial image display device 10F of the sixth embodiment, as shown in FIG. 22, the first upper surface 62 is provided with a mist injection port 23 and an air outlet 52F, and a vertical surface 64 rising in the vertical direction between the first upper surface 62. Are provided with a projection port 47F and a wind suction port 55F in order from the lower side. The air outlet 52F has a lower end position 52b on the vertical surface 64, and forms an air W along the vertical surface 64 at an angle φ of 0 °. The projection port 47F of the image projection mechanism 30F projects in the horizontal direction from the vertical surface 64 toward the wind outlet 52F, and the projecting end surface 47c is parallel to the vertical surface 64. For this reason, the projecting end surface 47c of the projection port 47F projects in the horizontal direction from the lower end position 52b of the air outlet 52F on the vertical surface 64. As a result, the distances in the horizontal direction of the remote location 47a and the proximity location 47b with respect to the lower end position 52b are equal to each other, so L _max and L _min are equal to each other, and they are smaller than 0 (zero). In this spatial image display device 10F, since the angle φ of the air outlet 52F is 0 °, the conditional expression (4) is used, so the values of the variables are shown in FIG. 23 and Table 6 below.

[Table 6]

  From each value in Table 6, the conditional expression (4) becomes “0.19 ≦ v ≦ 15”. For this reason, in the spatial image display device 10F, the wind speed v (m / s) of the wind W crossing the projection port 47F under the conditions of each value in Table 6 is “0.19 ≦ v ≦ 15”. By setting the forming mechanism 50F (the air blowing part 51 (the strength of the wind W formed there)), the fine particles Fp can be prevented from adhering to the projection port 47F.

  In the above-described embodiment, different embodiments, and examples, the spatial image display devices 10, 101, 102, 103, 104 of the examples as examples of the spatial image display device according to the present invention are described. Although 10A, 10B, 10C, 10D, 10E, and 10F have been described, a mist generating mechanism that forms a projection surface by spraying mist from a mist injection port, and an image that projects a projection image from the projection port onto the projection surface. A spatial image display device characterized by comprising a projection mechanism and a wind forming mechanism that blows out the wind crossing the projection port from the wind outlet, and the above-described one embodiment, the embodiment different from the above, The present invention is not limited to the examples.

  Further, in the above-described embodiment, different embodiments, and examples, the fog generation mechanism (20 etc.) and the image projection mechanism (30 etc.) are configured as shown in the description and corresponding figures. Yes. However, a projection image is projected from the image projection mechanism (the projection port) onto a fog screen as a projection surface formed by the fog generation mechanism (the spray port), and the wind crossing the projection port is blown by the wind forming mechanism. If it blows out from an exit, a positional relationship and an external shape should just be set suitably, and it is not limited to above-mentioned one embodiment, embodiment different from it, and the structure of each Example.

  Furthermore, in the above-described embodiment, different embodiments, and examples, the mist generation unit 21 of the mist generation mechanism (20, etc.) drives the ultrasonic transducer in the water stored in the storage unit. By doing so, a large number of water fine particles Fp ejected from the mist ejection port 23 are generated. However, the mist generation mechanism (the mist particle generation unit) is not limited to the above-described configurations as long as it generates a large number of fine particles from the liquid so as to form a mist injected from the mist injection port.

  In the above-described embodiment, different embodiments, and examples, the direction of the wind W formed by the wind forming mechanism 50 can be adjusted. However, the wind forming mechanism 50 may be configured to allow adjustment of the strength of the wind W to be formed. In that case, for example, the configuration is such that the strength of the airflow formed by the blower 51 of the wind forming mechanism 50 can be changed, and the integrated controller 11 automatically or according to the operation performed on the operation unit 13. The strength of the wind W formed by the forming mechanism 50) may be adjusted. Even in this case, it is desirable to adjust the strength of the wind W so as to satisfy the conditional expressions (1) to (4) described above. Moreover, when using together the suction part 53, it is possible to adjust the intensity | strength of the airflow which the said suction part 53 inhales according to the change of the intensity | strength of the wind W which the ventilation part 51 (wind formation mechanism 50) forms. desirable.

  As described above, the spatial image display device of the present invention has been described based on an embodiment, an embodiment different from the embodiment, and each example, but the specific configuration is an embodiment, an embodiment different from the embodiment, and each embodiment. The present invention is not limited to examples, and design changes and additions are permitted without departing from the gist of the present invention.

10, 101, 102, 103, 104, 10A, 10B, 10C, 10D, 10E, 10F Spatial image display device 20 Fog generating mechanism 22 Injection unit (as an example of injection direction changing unit) 23 Fog injection port 30, 30C, 30D, 30E, 30F Image projection mechanism 31 Illumination optical system 32 Image display element 33 Projection optical system 34 Light source 47, 47C, 47D, 47E, 47F Projection port 47a Remote location 47b Proximity location 50, 501, 502, 503, 504, 50A , 50B, 50C, 50D, 50E, 50F Air forming mechanism 52, 521, 522, 523, 524, 52A, 52B, 52C, 52D, 52E, 52F Air outlet 52b Lower end position 54 Temperature adjusting section 55, 554, 55F Air intake Mouth Db Blowing direction Fp Fine particle Pp Projected image Sm (As an example of the projection surface Of) fog screen W wind

JP 2014-106307 A

Claims (7)

A mist generating mechanism that forms a projected surface by injecting mist from a mist outlet;
An image projection mechanism for projecting a projection image from the projection port onto the projection surface;
A spatial image display device comprising: a wind forming mechanism that blows out the wind across the projection port from a wind outlet.   The image projection mechanism includes an illumination optical system that guides light from a light source as illumination light, an image display element that forms the projection image by the illumination light guided to the illumination optical system, and the image display element. The spatial image display device according to claim 1, further comprising: a projection optical system that projects the projected image on the projection surface in an enlarged manner. The velocity of the wind blown from the wind outlet on the projection port is v,
R is an average particle radius of fine particles of mist injected from the mist injection port,
The distance in the horizontal direction between the remote location farthest from the wind outlet at the projection port and the wind outlet is L _max ,
The distance in the horizontal direction between the closest location from the wind outlet at the projection port and the wind outlet is L _min ,
Hf is the distance in the vertical direction between the remote location and the wind outlet, based on the lower end position in the vertical direction at the wind outlet,
Hn is a distance in the vertical direction between the adjacent portion and the wind outlet with respect to the lower end position,
The distance in the direction orthogonal to the blowing direction in the wind blown out from the wind blowing outlet is d,
The spatial image display device according to claim 1, wherein the following conditional expressions are satisfied, where φ is an angle of the air outlet.
  The said wind formation mechanism is provided in the opposite side to the said wind blower outlet on both sides of the said projection opening, and has the wind suction inlet which suck | inhales the wind which crossed on the said projection opening, The Claim 1 to Claim 3 characterized by the above-mentioned. The spatial image display device according to any one of the above.   The spatial image display device according to any one of claims 1 to 4, wherein the wind forming mechanism includes a temperature adjusting unit that adjusts a temperature of the wind blown from the wind outlet.   The spatial image display device according to any one of claims 1 to 5, wherein the wind forming mechanism can change a blowing direction of the wind blown from the wind blowing outlet.   The spatial image display device according to claim 1, wherein the mist generation mechanism includes an injection direction changing unit that changes an injection direction of the mist at the mist injection port.