JP2016212298A - Privacy protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a privacy protection device that can provide a blindfold effect with high safety.SOLUTION: A privacy protection device 100 of the present invention is a privacy protection device 100 that protects privacy inside a room of a building, and comprises: a projector part 83 that projects an image; an intermediate screen 40 that forms the image projected by the projector part 83 into an image; and a transparent body that displays the image formed by the intermediate screen 40 by reflecting the image.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a privacy protection device that makes a virtual image visible to a visual region from the outside in order to protect privacy in a building room and makes it impossible to visually recognize the private space in the interior direction of the virtual image. .

  In order to protect the privacy in the building room, a privacy protection device has been proposed that makes it impossible to see the private space from the outside.

For example, in Cited Document 1 (Japanese Patent Laid-Open No. 2000-230373), half mirror surfaces that are inclined with respect to the window surface are laminated in an intermittent and parallel manner, and light is incident from the side edge of the window glass. In addition, a system is disclosed in which light is emitted outside the room by the half mirror surface to make it difficult to see the room.
JP 2000-230373 A

  The prior art described in Patent Document 1 brightens the light source so as to obtain a sufficient blinding effect. However, since the reflected light of the light source can be seen directly from the outside, hygiene problems and inconvenience due to glare are not possible. There was a problem that it brought a sense of pleasure and became an obstacle to traffic safety.

  In addition, since the outside is seen through the half mirror from the room, there is a problem that the deterioration of visibility is unavoidable as compared with a normal window.

  The present invention is for solving the above problems, and a privacy protection device according to the present invention is a privacy protection device for protecting privacy in a building room, and includes a projector unit for projecting an image and the projector. An intermediate screen that forms an image projected by the unit, and a transparent body that displays the image formed by reflecting the image formed on the intermediate screen.

  In the privacy protection apparatus according to the present invention, the transparent body is a window.

  The privacy protection device according to the present invention is characterized in that the transparent body is a transparent glass screen disposed in the building room.

  The privacy protection apparatus according to the present invention is characterized in that a plurality of the transparent glass screens are arranged.

  The privacy protection device according to the present invention includes a sensor that detects brightness, and a control unit that controls the amount of light of an image displayed on the transparent body according to the brightness detected by the sensor. Features.

  In the privacy protection apparatus according to the present invention, the intermediate screen has two main surfaces, a micro lens array including a plurality of micro lenses is provided on one main surface, and the other main surface is a smooth surface. It is a certain microlens array substrate.

  In the privacy protection device according to the present invention, the intermediate screen has two main surfaces, a micro lens array including a plurality of micro lenses is provided on one main surface, and the other main surface is a light diffusion surface. It is characterized by being a microlens array / light diffusion base material.

  In the privacy protection apparatus according to the present invention, the intermediate screen has two main surfaces, a micro lens array including a plurality of micro lenses is provided on one main surface, and the other main surface is a smooth surface. A microlens array substrate, a light diffusion substrate having two principal surfaces, a light diffusion surface provided on one principal surface, and a smooth surface on the other principal surface, the microlens array The main surface of the base material on which the microlens array is provided and the main surface of the light diffusion base material on which the light diffusion surface is provided are arranged to face each other.

  In the privacy protection device according to the present invention, the projector unit includes a laser light source that generates a laser beam and a scanning unit that scans the intermediate screen with the laser beam.

  In the privacy protection device according to the present invention, the projector unit includes a light source that generates light and an LCOS element that reflects the light to the intermediate screen.

  In the privacy protection device according to the present invention, the projector unit includes a light source that generates light and a DMD element that reflects the light to the intermediate screen.

  The privacy protection device according to the present invention uses the projector unit and the intermediate screen, and does not directly see the reflected light of the light source as compared with the conventional technology using a half mirror. According to this, a highly safe blindfold effect can be obtained.

  Moreover, according to the privacy protection apparatus which concerns on this invention, since a half mirror becomes unnecessary, the effect that the visibility from a room becomes high can be acquired.

  Furthermore, according to the privacy protection device of the present invention, it is possible to display an arbitrary video such as a guide or an advertisement outside the room.

It is a figure which shows the structure of the privacy protection apparatus 100 which concerns on embodiment of this invention. 2 is a perspective view of a microlens array substrate 50 used as an intermediate screen 40. FIG. It is the figure which looked at the micro lens array 54 extended in a 1st direction and a 2nd direction from the z-axis direction. It is a figure explaining the definition of a diffusion angle. It is a figure which shows the structure of the privacy protection apparatus 100 which concerns on other embodiment of this invention. It is a figure which shows the structure of the privacy protection apparatus 100 which concerns on other embodiment of this invention. It is a figure which shows the intermediate | middle screen 40 used for the privacy protection apparatus 100 which concerns on other embodiment of this invention. It is a figure which shows the intermediate | middle screen 40 used for the privacy protection apparatus 100 which concerns on other embodiment of this invention. It is a figure which shows the intermediate | middle screen 40 used for the privacy protection apparatus 100 which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a privacy protection device 100 according to an embodiment of the present invention. Note that the drawings described below are schematic views and may differ from actual shapes, dimensions, and arrangements.

  The privacy protection device 100 makes a virtual image with a high light quantity visible to an outdoor viewer from the visual region of the outdoor viewer of the building, and makes it impossible to visually recognize the private space in the interior direction of the virtual image. is there. In other words, the privacy protection device 100 is such that the outdoor viewer is blindfolded with a high light quantity virtual image.

  The privacy protection device 100 includes a projection unit 85 that projects an image with a high light quantity, and the projection unit 85 includes an intermediate screen 40 and a projector unit 83. In FIG. 1, a building window (transparent body) makes the display by the projection unit 85 visible as a virtual image, thereby making it impossible to visually recognize the private space in the interior direction of the room.

  Next, the detail of the projection unit 85 which comprises the privacy protection apparatus 100 is demonstrated. FIG. 1 shows an example of the structure of the projection unit 85 of the privacy protection device 100 according to the embodiment of the present invention.

  The coordinates in the projection unit 85 are defined by the xyz three-dimensional orthogonal coordinates shown in FIG. For example, the light emitted from the first light source 11 is light emitted in a direction parallel to the y direction. Further, it is assumed that the optical axis of the collimator lens 35 is in a direction parallel to the z direction.

  From the projection unit 10 in the projection unit 85, light of a projection image displayed by the privacy protection device 100 is emitted. The projection unit 10 includes a first light source 11, a second light source 12, a third light source 13, a first dichroic prism 21, a second dichroic prism 22, a condenser lens 26, and the like.

  The first light source 11, the second light source 12, and the third light source 13 emit light having different wavelengths. The first light source 11 emits light of the first wavelength, and the second light source 12 emits the second light. The third wavelength light is emitted from the third light source 13. In the present embodiment, for example, the first wavelength light emitted from the first light source 11 is blue light, the second wavelength light emitted from the second light source 12 is green light, and the third light source. The light of the third wavelength emitted from 13 can be red light.

  As the first light source 11, the second light source 12, and the third light source 13, various laser devices such as a semiconductor laser device (laser light source) that emits laser light as coherent light can be used.

  In the present embodiment, the first wavelength light emitted from the first light source 11 and the second wavelength light emitted from the second light source 12 are incident on different surfaces of the first dichroic prism 21, respectively. The light of the third wavelength emitted from the third light source 13 is disposed so as to enter the second dichroic prism 22.

In the first dichroic prism 21, the first wavelength light emitted from the first light source 11 is transmitted, and the second wavelength light emitted from the second light source 12 is reflected. Thereby, the light of the first wavelength and the light of the second wavelength are combined.

  The light having the first wavelength and the light having the second wavelength combined in this manner enter the second dichroic prism 22.

  In the second dichroic prism 22, the first wavelength light emitted from the first light source 11 and the second wavelength light emitted from the second light source 12 are transmitted, and the first light emitted from the third light source 13 is transmitted. Light of wavelength 3 is reflected. Thereby, the light of the first wavelength, the light of the second wavelength, and the light of the third wavelength are combined.

  In this way, the first wavelength light, the second wavelength light, and the third wavelength laser light combined by the second dichroic prism 22 are reflected by the projection mirror 30 via the condenser lens 26. , And enters the collimator lens 35. The projection mirror 30 has a function capable of changing the angle two-dimensionally, whereby the incident light can be scanned two-dimensionally, and a projection image by a desired laser beam is formed. The

  The projection mirror 30 further moves along a first axis (not shown) parallel to the x-axis so that the projection mirror 30 can move in the (a) direction, and a second axis (not shown) orthogonal to the first axis. ) About the direction of (b).

  The projection mirror 30 can be appropriately replaced with another optical member as long as it can scan incident light in a two-dimensional manner. As such an optical member, a galvanometer can be used. A mirror, a galvanometer scanner, a polygon mirror, a prism, an acoustooptic device, an optical device using a MEMS (Micro Electro Mechanical System) technology, or the like can be used as appropriate.

The laser light reflected by the projection mirror 30 scans the collimator lens 35 to form a projection image by the desired laser light. In the present embodiment, the point (r ₀ ) where the laser light is incident on the projection mirror 30 and reflected is set so as to exist on the optical axis of the collimator lens 35. The collimator lens 35 collimates the laser light incident from the projection mirror 30 and emits it toward the intermediate screen 40.

  A projected image by the incident laser beam is formed on the intermediate screen 40. The window (transparent body) displays the image I formed on the intermediate screen 40 by reflection. Thereby, the display can be visually recognized as a virtual image I ′ from the visual region (E) of the outdoor viewer assumed in advance. This makes it impossible to visually recognize the private space in the interior direction of the virtual image.

  The intermediate screen 40 is an optical member made of a transparent base material having a predetermined transparency or higher. The intermediate screen 40 can be configured by molding using an organic resin material, or can be configured by using an inorganic material such as glass.

  In this embodiment, the microlens array substrate 50 is used as the intermediate screen 40, but other substrates may be used.

  In the present embodiment, an optical system including a collimator lens 35 is disposed between the projection mirror 30 and the intermediate screen 40, but these are not necessarily essential constituent elements. In addition, a projection optical system can be appropriately used between the intermediate screen 40 and the window (transparent body).

  Here, the intermediate screen 40 used in the privacy protection device 100 according to the present invention will be described in more detail. FIG. 2 is a perspective view of a microlens array substrate 50 used as the intermediate screen 40.

  The microlens array substrate 50 has a first main surface 51 and a second main surface 52, and a microlens array 54 in which a plurality of microlenses 53 are periodically arranged on the first main surface 51. And the second main surface 52 is a smooth surface 55. The microlens array substrate 50 is made of a transparent substrate.

  The direction of the axis parallel to the x-axis is defined as the first direction, and the direction of the axis parallel to the y-axis is defined as the second direction (orthogonal relationship with the first direction).

  Here, when the viewer visually views the window (transparent body), the first direction of the intermediate screen 40 (microlens array substrate 50) forms an image that is viewed as a horizontal image by the viewer. The second direction of the intermediate screen 40 (microlens array substrate 50) is a direction in which an image viewed as a vertical image by a viewer is formed.

  Under the definitions as described above, the microlens array substrate 50 that is the intermediate screen 40 has a main surface that extends in a first direction and a second direction orthogonal to the first direction.

  FIG. 3 is a view of the microlens array 54 spreading in the first direction and the second direction as seen from the z-axis direction. As shown in the figure, in the intermediate screen 40 (microlens array substrate 50) according to the present embodiment, the microlens 53 is a square having a side length d when viewed from the z-axis direction. Something is used. Note that the microlens 53 may not be square, and may be, for example, a regular hexagon. However, it is preferable that the adjacent microlenses 53 are in close contact with each other, and a smooth surface that does not form a lens does not remain in the gap between the adjacent microlenses 53. This is to reduce the linearly transmitted light.

Each microlens 53 is a spherical lens or an aspherical lens, and has a curvature with a radius of curvature R _{1 in} the first direction and a radius of curvature R _{2 in} the second direction at the apex on the first main surface 51 side. Has a curvature of. The apex means a point where each micro lens 53 protrudes most in the z-axis direction.

Then, the cross-sectional shape of the surface of each microlens 53 that is parallel to the first direction and includes the optical axis of the microlens 53 is a surface that is parallel to the second direction and includes the optical axis of the microlens 53. It is preferable to make it different from the cross-sectional shape in FIG. More specifically, the radius of curvature R ₁ of the first direction in the first principal surface 51 side apex of each microlens 53, it is also possible to equalize the radius of curvature R ₂ of the second direction, varying Is preferred.

In general, the angle at which the private space can be seen through the window is different between the horizontal direction and the vertical direction, and the display by the privacy protection device 100 is necessary for an angle that is necessary and sufficient in the horizontal direction and the vertical direction. to obtain a blindfold effect, because the curvature of the first direction in the first principal surface 51 side apex of the microlens 53 and the radius R _1, it is better to the curvature radius R ₂ of the second direction are different is there.

Furthermore, in general, taking into account that the angle at which the private space can be viewed through the window is wider in the horizontal direction than in the vertical direction, the first angle at the apex of each microlens 53 on the first main surface 51 side is first. The radius of curvature R ₁ in the direction is preferably smaller than the radius of curvature R _{2 in} the second direction.

  The privacy protection device using a laser light source as the light source of the privacy protection device 100 has an advantage that speckle noise due to the laser light is suppressed by using the microlens array 54.

  Next, optical characteristics preferable for the intermediate screen 40 when the intermediate screen 40 (microlens array substrate 50) is used in the privacy protection device 100 will be described. First, since the diffusion angle is frequently used below, this is defined.

FIG. 4 is a diagram for explaining the definition of the diffusion angle. In this specification, the maximum scattering of light emitted when light substantially parallel to the principal surface normal direction is incident from the microlens array base material 50 and the light diffusion base material 60 constituting the intermediate screen 40. The full width at half maximum (FWHM), which is the difference between the two angles that are half the light intensity I _max , is defined as the diffusion angle θ. The scattered light intensity depends on the Y value of the XYZ color system (CIE 1931 color system) and is measured by a three-dimensional variable angle spectrophotometric system (GCMS-13 type, manufactured by Murakami Color Research Laboratory Co., Ltd.). ing.

Under the above definition, the microlens array substrate 50 has a diffusion angle θ ₁ corresponding to the horizontal direction (first direction) of display by the privacy protection device 100 and the vertical direction of display by the privacy protection device 100 ( It is preferable that there is a relationship of θ ₁ > θ ₂ between the diffusion angle θ ₂ corresponding to the second direction). This is because the angle at which the private space can be seen through the window is wider in the horizontal direction than in the vertical direction.

  Next, the material of the base material that becomes the base of the intermediate screen 40 will be described. The base material used as the base of the intermediate screen 40 may be any transparent material, such as thermoplastic resin, thermosetting resin, UV curable resin, electron beam curable resin, or glass. Can be used.

  If a thermoplastic resin is used as the base material of the intermediate screen 40, for example, polycarbonate resin, acrylic resin, fluorine acrylic resin, silicone acrylic resin, epoxy acrylate resin, polystyrene resin, cycloolefin Examples thereof include polymers, methylstyrene resins, fluorene resins, PET, and polypropylene.

  Further, the intermediate screen 40 is not necessarily formed from one base base material. For example, in the case of the microlens array substrate 50, the microlens array 54 and the like and the substrate-like member may be configured as separate members, and these may be bonded together with an adhesive or the like. However, in this case, it is preferable that all members have the same refractive index.

  Next, a configuration for controlling the privacy protection apparatus 100 according to the present invention will be described. The privacy protection device 100 includes an illuminance sensor 110 as a sensor for detecting outdoor brightness. In addition, the privacy protection device 100 includes a light amount control unit 120, which controls the light amount of the projection unit 85. The light amount control unit 120 controls the amount of light output from the projection unit 85 based on the illuminance detected by the illuminance sensor 110, so that the window ( An image is displayed on a transparent body.

  In the present embodiment, the illuminance sensor 110 is used as a sensor for detecting outdoor brightness, but other sensors such as a luminance sensor and a digital camera may be used.

The privacy protection apparatus 100 according to the present invention as described above uses the projector unit 83 and the intermediate screen 40, and does not directly see the reflected light of the light source as compared with the conventional technique using a half mirror. According to the privacy protection device 100 of the present invention, a highly safe blindfold effect can be obtained.

  Moreover, according to the privacy protection apparatus 100 which concerns on this invention, since a half mirror becomes unnecessary, the effect that the visibility from a room becomes high can be acquired.

  Furthermore, according to the privacy protection apparatus 100 of the present invention, it is possible to display an arbitrary video such as a guide or an advertisement outside the room.

  In the above embodiment, as a drawing method of the privacy protection device 100, the laser scanning method including the projection unit 10 and the projection mirror 30 has been described based on an example applied to the display unit 100. The display unit 100 employs an LCOS method using a light source and an LCOS (Liquid crystal on silicon) element as a drawing method, or a DLP (Light Source) and a DLP (Digital Mirror Device) element using a DMD (Digital Mirror Device) element. The present invention can also be applied to a digital light processing method. Examples of the light source include a halogen lamp, a metal halide lamp, an ultrahigh pressure mercury lamp, an LED, and a semiconductor laser.

  In the case of the LCOS method, the light from the light source is selectively reflected by the LCOS element, which is a reflective liquid crystal element, with respect to the intermediate screen 40, and in the case of the DLP method. Realizes the privacy protection apparatus 100 by selectively reflecting the light from the light source with respect to the intermediate screen 40 by the DMD element, which is a reflective element in which a plurality of micromirrors are arranged. be able to.

  Next, another embodiment of the present invention will be described. FIG. 5 is a diagram showing a configuration of a privacy protection device 100 according to another embodiment of the present invention.

  In the previous embodiment, the projection unit 85 projects a blindfold image onto the window that is a transparent body. However, in the present embodiment, as shown in FIG. Separately from the window, the image I imaged on the intermediate screen 40 is displayed on the transparent glass screen 90 by reflection.

  Moreover, the privacy protection apparatus 100 according to the present embodiment includes an illuminance sensor 110 as a sensor that detects the brightness of the private space. Moreover, the privacy protection apparatus 100 according to the present embodiment is provided with an optical filter 150 between the intermediate screen 40 and the transparent glass screen 90 so that the light can be reduced as necessary. It has become. The filter control unit 140 controls the amount of light projected onto the transparent glass screen 90 by controlling the filter 150. The filter control unit 140 controls the amount of light reduced by the filter control unit 140 based on the luminance detected by the illuminance sensor 110, so that the transparent glass has a light amount optimal for blindfolding according to the luminance of the private space. An image is displayed on the screen 90.

  In the present embodiment, the filter 150 is used as the dimming means, but a shutter or the like can also be used.

  Further, a sensor that detects the brightness of the virtual image I ′ and the brightness of the intermediate screen 40 may be provided, and the filter 150 may be controlled based on detection information detected by these sensors.

  Further, in the present embodiment, the filter 150 is controlled based on the detection information of the luminance sensor 130 to adjust the amount of light, but the filter 150 is controlled based on the detection information of the illuminance sensor 110 of the previous embodiment. You may do it.

  Further, the light amount control unit 120 of the previous embodiment may control the light amount of the projection unit 85 based on the detection information of the luminance sensor 130.

  According to the embodiment as described above, the same effect as that of the previous embodiment can be obtained.

  Next, another embodiment of the present invention will be described. FIG. 6 is a diagram illustrating a configuration of a privacy protection device 100 according to another embodiment of the present invention. In FIG. 6, the projector unit is not shown.

  In the previous embodiment, only one transparent glass screen 90 was provided. However, in the present embodiment, a plurality of transparent glass screens 90 are provided as shown. Each of these transparent glass screens 90 is disposed so that the principal surfaces thereof are parallel to each other, and the respective transparent glass screens 90 are disposed at a predetermined interval.

  According to such an embodiment, the area where the virtual image I ′ is formed can be increased, and a wider private space can be blinded.

  Next, another embodiment of the present invention will be described. In the privacy protection device 100 according to another embodiment of the present invention, the intermediate screen 40 used is different from the privacy protection device 100 according to the previous embodiment.

  FIG. 7 is a view showing an intermediate screen 40 used in the privacy protection device 100 according to another embodiment of the present invention. In the present embodiment, a microlens array / light diffusion base material 70 is used as the intermediate screen 40. In addition, the arrow in a figure has shown the light into which the light from the collimator lens 35 injects.

  The microlens array / light diffusing substrate 70 has a first main surface 71 and a second main surface 72, and a plurality of microlenses 73 are periodically arranged on the first main surface 71. A lens array 74 is provided, and the second main surface 72 is a light diffusion surface 75. The microlens array substrate 70 is made of a transparent substrate.

  The light diffusing surface 75 is composed of fine irregularities having a random cycle. Such a light diffusion surface 75 is configured by providing fine scratches on a smooth surface, for example, like ground glass. In order to configure the light diffusion surface 75, blasting such as sand blasting or bead blasting is suitable.

  Even when the microlens array / light diffusion base material 70 as described above is used, the same effects as those of the previous embodiment can be obtained.

  Next, another embodiment of the present invention will be described. The privacy protection device 100 according to another embodiment of the present invention is also different from the privacy protection device 100 according to the previous embodiment since the intermediate screen 40 used is different from the privacy protection device 100 according to the previous embodiment.

8 and 9 are views showing an intermediate screen 40 used in the privacy protection device 100 according to another embodiment of the present invention. In the present embodiment, two sheets of the microlens array substrate 50 and the light diffusion substrate 60 described so far are used as the intermediate screen 40. In addition, the arrow in a figure has shown the direction in which the light from the collimator lens 35 injects.

  The light diffusing substrate 60 has a first main surface 61 and a second main surface 62, a light diffusing surface 64 is provided on the first main surface 61, and the second main surface 62 is a smooth surface 65.

  The light diffusing surface 64 is composed of fine irregularities having a random period. Such a light diffusing surface 64 is configured by providing fine scratches on a smooth surface like ground glass, for example. In order to configure the light diffusion surface 64, blasting such as sand blasting or bead blasting is suitable.

  In the intermediate screen 40 according to the present invention, the first main surface 51 provided with the microlens array 54 of the microlens array substrate 50 and the first main surface provided with the light diffusion surface 64 of the light diffusion substrate 60. 61 are arranged opposite to each other. Further, the facing distance between the microlens array substrate 50 and the light diffusion substrate 60 is preferably 0 μm or more and 100 μm or less.

  The surface on which the light from the collimator lens 35 is incident may be on the smooth surface 55 side of the microlens array substrate 50 as shown in FIG. 8, or as the smooth surface 65 of the light diffusion substrate 60 as shown in FIG. Also good. However, the former layout can make the brightness of the virtual image more uniform.

  Note that the above-described distance between the opposing surface is the top where the microlens array 54 protrudes most from the main surface of the microlens array substrate 50 and the top where the light diffusion surface 64 protrudes most from the main surface of the light diffusion substrate 60. The interval between.

  In the present embodiment, since an image is formed by the microlens array base material 50 and the light diffusion base material 60 as the intermediate screen 40, light is more effectively used than when a simple screen is used to form an image. Can be transmitted, and the luminance can be increased. In addition, since sufficient luminance can be obtained with a small amount of light, it is possible to save power by suppressing the output of each laser light source and the like.

In addition, as the light-diffusion base material 60, it is preferable that diffusion angle (theta) _D is 5 degrees or more and 6 degrees or less.
When the microlens array substrate 50 and the light diffusion substrate 60 are used in combination like the intermediate screen 40 according to the present embodiment, the anisotropic diffusion property (horizontal direction and vertical direction) of the microlens array substrate 50 is used. It is desirable to combine with a light diffusing substrate 60 having a small diffusion angle (in combination with a light diffusing substrate having a large diffusion angle), in order to maintain a property that the diffusion profile is different). Because the nature of becomes dominant and approaches the isotropic diffusion as a whole). However, since the rainbow pattern caused by diffracted light does not disappear when the diffusion angle of the light diffusion base material 60 is 5 ° or less, in the present invention, the diffusion base material 60 has a diffusion angle θ _D of 5 ° or more and 6 ° or less. The thing is adopted.

  Even when the intermediate screen 40 including the microlens array substrate 50 and the light diffusion substrate 60 as described above is used, the same effects as those of the previous embodiment can be obtained.

  Note that an invention in which the configurations of the embodiments described so far are arbitrarily combined is also included in the category of the privacy protection device 100 according to the present invention.

As described above, since the privacy protection device according to the present invention uses the projector unit and the intermediate screen and does not directly see the reflected light of the light source as compared with the conventional technology using the half mirror, the privacy protection according to the present invention. According to the apparatus, a highly safe blindfold effect can be obtained.

  Moreover, according to the privacy protection apparatus which concerns on this invention, since a half mirror becomes unnecessary, the effect that the visibility from a room becomes high can be acquired.

  Furthermore, according to the privacy protection device of the present invention, it is possible to display an arbitrary video such as a guide or an advertisement outside the room.

DESCRIPTION OF SYMBOLS 10 ... Projection part 11 ... 1st light source 12 ... 2nd light source 13 ... 3rd light source 21 ... 1st dichroic prism 22 ... 2nd dichroic prism 26 ... condensing lens 30 ... Projection mirror (scanning section)
35 ... Collimator lens 40 ... Intermediate screen 50 ... Micro lens array substrate 51 ... First main surface 52 ... Second main surface 53 ... Micro lens 54 ... Micro lens array 55 ... smooth surface 60 ... light diffusion base material 61 ... first main surface 62 ... second main surface 64 ... light diffusion surface 65 ... smooth surface 70 ... micro lens array / Light diffusing substrate 71 ... first main surface 72 ... second main surface 73 ... micro lens 74 ... micro lens array 75 ... light diffusing surface 83 ... projector portion 85 ... Projection unit 90 ... Transparent glass screen (transparent body)
DESCRIPTION OF SYMBOLS 100 ... Privacy protection apparatus 110 ... Illuminance sensor 120 ... Light quantity control part 130 ... Luminance sensor 140 ... Filter control part 150 ... Filter

Claims (11)

A privacy protection device for protecting privacy in a building room,
A projector unit for projecting an image;
An intermediate screen for forming an image projected by the projector unit;
A privacy protection device comprising: a transparent body that performs display by reflecting an image formed on the intermediate screen. The privacy protection device according to claim 1, wherein the transparent body is a window. The privacy protection device according to claim 1, wherein the transparent body is a transparent glass screen disposed in the building room. The privacy protection device according to claim 3, wherein a plurality of the transparent glass screens are arranged. A sensor to detect brightness,
5. The privacy according to claim 1, further comprising: a control unit configured to control a light amount of an image displayed on the transparent body in accordance with brightness detected by the sensor. Protective device. The intermediate screen is
2. A microlens array substrate having two main surfaces, wherein a microlens array comprising a plurality of microlenses is provided on one main surface, and the other main surface is a smooth surface. The privacy protection device according to any one of claims 5 to 5. The intermediate screen is
A microlens array / light diffusing substrate having two main surfaces, a microlens array comprising a plurality of microlenses on one main surface and the other main surface being a light diffusion surface The privacy protection device according to any one of claims 1 to 5. The intermediate screen is
A microlens array substrate having two main surfaces, a microlens array comprising a plurality of microlenses on one main surface, and the other main surface being a smooth surface;
A light diffusing substrate having two main surfaces, wherein one main surface is provided with a light diffusion surface, and the other main surface is a smooth surface;
Consists of
The main surface of the microlens array substrate on which the microlens array is provided and the main surface of the light diffusion substrate on which the light diffusion surface is provided are arranged to face each other. The privacy protection device according to any one of claims 5 to 5. The projector unit is
A laser light source for generating laser light;
The privacy protection device according to claim 1, further comprising: a scanning unit configured to scan the intermediate screen with the laser light. The projector unit is
A light source that generates light;
The privacy protection device according to any one of claims 1 to 8, further comprising an LCOS element that reflects the light to the intermediate screen. The projector unit is
A light source that generates light;
The privacy protection device according to any one of claims 1 to 8, further comprising: a DMD element that reflects the light to the intermediate screen.

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