JP2011237682A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device in which pictures free from distortion can be viewed substantially uniformly and clearly from any view point direction, satisfactory image quality is free from shrinking but enlarged in periphery area, and a rotatable spherical display device is a space-saving thin type applicable to general purpose.SOLUTION: A spherical screen 1 comprises a projection optical system 2 having a radial optical path in the inside of the screen; an optical system 3 for turning the optical path; and a projector 4. The spherical screen has a substantially spherical hollow structure which has a smooth external surface and substantially concentric spherical inner surface which is made of transparent member and serves as a diffusion surface.

Description

  The present invention displays an image projected from a projector via a projection optical system disposed inside the screen on a screen having a smooth surface on the outside and a diffusion surface on the inside, and the image is observed from outside the screen. The present invention relates to a display device.

  Further, the present invention relates to a display device in which when the screen is rotated, the image projected from the projector is also rotated, and the image is displayed on the screen according to the rotation angle.

  As a display device that displays an image projected from a projector on a diffusion surface and observes the image from the outside of a spherical or curved transparent body, for example, as shown in Patent Document 1 and Patent Document 2 There is.

  As shown in FIG. 18, as shown in FIG. 18, a diffusing surface b is provided inside a transparent sphere a, and a projection image of a projector d provided below the half mirror c is projected on the diffusing surface b. The enlarged virtual image is observed from the viewpoint e by the function of a as a convex lens.

  As shown in Patent Document 2, as shown in FIG. 19, a diffusing surface b is provided in part or close to a transparent sphere a, and a projection image of a projector d provided below the half mirror c is projected on the diffusing surface b. In addition, the transparent sphere a acts as a convex lens and is observed from the viewpoint e as an enlarged virtual image.

Japanese Patent Laid-Open No. 2001-21833 JP 2000-98297 A

  However, since the methods disclosed in Patent Document 1 and Patent Document 2 form a small image and observe using a transparent sphere as a magnifier, the viewpoint position is limited. Furthermore, since it is projecting from a distance, the efficiency is poor. Moreover, since the transparent sphere is used as a magnifying glass, the peripheral image is deteriorated and the image is also distorted. In addition, there is a problem that the space for installing the projector becomes large and thick due to the large size, and the use of a half mirror leads to loss of light quantity.

  The present invention has been made in view of the above-mentioned problems. An image that is bright and undistorted almost uniformly from any direction in the viewpoint can be seen. Further, since the peripheral image quality is good, the image can be seen well up to a spherical limit. Another object of the present invention is to provide a display device that is thin and space-saving and can be applied to various applications by allowing the spherical display portion to rotate.

  In order to achieve the above object, a display device according to the present invention includes a screen, a projection optical system disposed inside the screen, an optical system that bends an optical path, and a projector, and the screen has a smooth outer surface. It is a transparent member whose inner surface is a diffusion surface.

  In the display device of the present invention, it is preferable that the screen has a flat plate shape.

  In the display device of the present invention, it is preferable that the screen has a shape having an arbitrary curved surface portion.

  Alternatively, the display device according to the present invention is the display device according to any one of claims 1 to 3, which can be attached to an operation unit or a main body unit of an endoscope. The imaging means of the endoscope is rotated according to the detected rotation angle.

  Alternatively, the display device according to the present invention is characterized in that the screen is a spherical screen, and includes a projection optical system having a radial optical path disposed on the inner side of the screen and a projector, and a projector. .

  In the display device of the present invention, it is preferable that the spherical screen is a screen having a hollow structure in which an outer surface is a smooth surface and a substantially concentric inner spherical surface is formed of a transparent member having a diffusing surface.

In the display device of the present invention, the exit pupil (EP) position of the optical system having a radial optical path is set to 0 (zero) as the spherical center and R as the position of the inner spherical surface.
+ R / 2>EP> -2R
It is preferable that

  In the display device of the present invention, it is preferable that the projection optical system has an angle of view (2ω) of 80 degrees to 300 degrees and an afocal optical system that expands the optical path of the projector.

  In the display device of the present invention, the projection optical system has an angle of view (2ω) of 80 ° to 300 °, and the image projected from the projector forms an intermediate image once with an imaging lens. The projection lens is preferably configured to be enlarged and projected.

  The display device of the present invention preferably includes an optical system that bends the optical path.

  In the display device of the present invention, the two spherical screens are arranged so as to be rotatable around an axis, and when one of the spherical screens is rotated, the other spherical screen is similarly rotated. In addition, it is preferable that the optical system for bending the optical path is constituted by a prism, and the rotation angle of each spherical screen is set so that the optical path of the prism is secured.

  Alternatively, in the display device of the present invention, two spherical screens are arranged to be connected to each other by a connecting member facing each other with a flat plate member interposed between them so that the spherical screen can be rotated about the axis. Then, the other spherical screen rotates in the same manner, and one or two projectors are built in the flat plate-like member, and a light beam from the projector is projected onto the spherical screen by an optical path deflecting prism. The rotation angle (φ) of the screen is 0 ° <φ <350 °, and the connection member is formed with a notch so as not to vignett the optical path from the projector.

  Alternatively, in the display device of the present invention, the projector and the deflection prism are provided in the pedestal, and the spherical screen is provided on the pedestal via the holding unit, and the optical path from the projector is bent at a substantially right angle by the deflection prism. The spherical screen is aligned with the rotation axis of the spherical screen, and the holding portion of the spherical screen is rotatable, so that the optical path is not vignetted by the holding portion within the range of the rotation angle of the spherical screen. The holding portion is provided with a notch, and a rotation angle of the spherical screen is detected, and an image projected by the projector is rotated according to the rotation angle. .

  In the display device according to the aspect of the invention, it is preferable that an image acquired by an imaging unit installed at an arbitrary location is input to the projector.

  Alternatively, the display device according to the present invention is the display device according to claim 10 that can be attached to an operation unit or a main body of an endoscope, and detects the rotation angle when the spherical screen is rotated. The imaging means of the endoscope is rotated according to the rotation angle.

The display device of the present invention has the following effects.
(1) Viewable from any direction.
(2) Thin and space saving.
(3) It looks bright regardless of the viewpoint direction.
(4) The image is not distorted.
(5) Since the peripheral image quality is good, the image can be seen well up to the last minute spherical surface.
(6) The image can be changed by rotating the spherical display section. Since it can be active, it can be applied to attractive games.
(7) Using the index provided on the spherical display unit, the relationship between the index and the display image can be manipulated by rotating the spherical surface.
(8) Since an image can be displayed on the entire circumference of the sphere, it is possible to express a sense of realism.

It is explanatory drawing which shows the observation range when changing a viewpoint and observing a spherical screen. It is explanatory drawing which shows the range which looks bright even if diffusivity is not strong in relation to an exit pupil (EP). It is explanatory drawing which shows the image display range in case of angle of view (2ω) = 220 degrees. It is explanatory drawing which shows the image display range in case of angle of view (2ω) = 140 degrees. FIG. 3 is an explanatory diagram illustrating a display device of Example 1. FIG. 10 is an explanatory diagram illustrating a display device according to a second embodiment. It is a perspective view of the spherical body holding | maintenance part of Example 2. FIG. FIG. 10 is an explanatory diagram illustrating a display device according to a third embodiment. FIG. 10 is an explanatory diagram illustrating another example of the arrangement of the projector and the deflection prism of the display device according to the third embodiment, in which (A) illustrates an example in which the projector is disposed above and below the deflection prism, and (B) illustrates a single projector on the left and right. A displayed example, (C) shows an example in which an image is displayed on the left and right by one projector. 10 is a perspective view showing a display device of Example 4. FIG. FIG. 10 is an explanatory diagram illustrating a display device according to a fourth embodiment. 7A and 7B are diagrams illustrating a display device according to a fifth embodiment, in which FIG. 5A is an exploded perspective view, FIG. 5B is a perspective view in which a CCD, a projector, and a deflection prism are assembled, and FIG. It is. 7A and 7B are diagrams illustrating a display device according to a sixth embodiment, where FIG. 7A is a perspective view of a display unit having a rectangular flat screen, and FIG. 5B is an enlarged perspective view of a prism unit and a projector unit portion of FIG. FIG. 6C is a perspective view of a spherical screen as a display unit. It is explanatory drawing which shows the example which applied the display apparatus of this invention to the fortune-telling ball. It is explanatory drawing which shows the example which applied the display apparatus of this invention to the constellation fortune-telling ball. It is explanatory drawing which shows the example which applied the display apparatus of this invention to the doorknob display apparatus. It is explanatory drawing which shows the example which applied the display apparatus of this invention to the wall surface embedded type signal lamp. It is explanatory drawing which shows a prior art example. It is explanatory drawing which shows another prior art example.

  Prior to the description of the embodiments, the outline and effects of the present invention will be described.

  The display device of the present invention includes a screen, a projection optical system disposed inside the screen, an optical system that bends the optical path, and a projector. The screen is a transparent member that has a smooth surface on the outer surface and a diffusion surface on the inner surface. It is characterized by being.

  The surface is smooth (mirror surface), and the image is projected from the inside onto a screen that has a diffusing surface on the inside, allowing the image to be displayed on the screen, allowing observation from the outside, and the addition of an optical system that bends the optical path. Can be realized.

  In the display device of the present invention, it is preferable that the screen has a flat plate shape.

  The screen surface may be a flat plate and the size can be selected as appropriate.

  In the display device of the present invention, preferably, the screen has a shape having an arbitrary curved surface portion.

  The screen surface may have a shape having a curved surface portion, and the curved surface shape may be appropriately selected, or may be a combination of a curved surface and a flat surface.

  Furthermore, the display device of the present invention is the display device according to any one of claims 1 to 3, which can be attached to an operation unit or a main body of an endoscope, and detects a rotation angle when the screen is rotated. Then, the imaging means of the endoscope is rotated according to the rotation angle.

  When the screen is rotated, the imaging means of the endoscope rotates accordingly, so that the imaging direction of the endoscope can be observed and felt on the screen.

  Alternatively, the display device according to the present invention is characterized in that the screen is a spherical screen, and includes the projection optical system having a radial optical path disposed on the inner side of the screen and the spherical screen projector. It is said.

  The screen is a spherical screen, and an image is displayed on the spherical surface by projecting an image onto the screen from a projection optical system having a radial optical path arranged on the spherical center side so that it can be observed from the outside.

  In the display device of the present invention, preferably, the spherical screen is a screen having a substantially spherical hollow structure in which the outer surface is a smooth surface and the inner concentric spherical surface is a diffusing surface transparent member.

  The image is projected on a spherical surface by projecting an image from the inside onto a screen of a transparent sphere composed of an outer sphere having a smooth surface (mirror surface) and an inner sphere having a substantially concentric diffusion surface. The thickness is reduced by arranging a deflection optical path between the projector and the spherical surface.

In the display device of the present invention, it is preferable that the exit pupil (EP) position of the optical system having a radial optical path is 0 (zero) as the spherical center and R is the position of the inner spherical surface.
+ R / 2>EP> -2R
It is.

  The exit pupil position of the projected image on the spherical display portion is provided near the sphere so that the image looks bright no matter where it is viewed. When the exit pupil (EP) is in the above range, bright diffusion can be achieved even if the diffusivity is not so strong.

Here, the theory for making the screen bright and uniform in the display device of the present invention will be described based on the spherical screen shown in FIGS.
FIG. 1 shows an observation range when a spherical screen is observed from different viewpoints, and FIG. 2 shows a range in which it looks bright without increasing diffusivity in relation to the exit pupil (EP).

As shown in FIG. 1, the viewing range D of the image display area C, that is, the range in contact with the spherical surface changes between the viewpoint A and the viewpoint B, but since both are in contact with the spherical surface, the image can be observed. As shown in FIG. 2, when viewed from the viewpoint A, when the optical axis passing through the center 0 of the spherical surface is E, the light ray in contact with the spherical surface is F, the refractive index of the spherical surface is n, and the exit pupil position is EP, the light ray F is θc = sin ⁻¹ (1 / n) on the outer spherical surface, and is incident at approximately θc on the inner spherical surface.
Since the angle difference formed on the inner sphere between the optical path connecting the entrance pupil and this point and the ray incident at θc of the inner sphere is relatively small, bright observation is possible even if the diffusion is not strong.

Therefore, the position of the exit pupil is + R / 2>EP> -2R.
The range is good.
Also, 0>EP> -3 / 2R
If it is, it is more efficient.

  In the display device of the present invention, it is preferable that the projection optical system has an angle of view (2ω) of 80 degrees to 300 degrees and an afocal optical system that expands the optical path of the projector.

  When the image is projected on the inner surface of the sphere in a range of 160 degrees or more, the image can be observed from all directions regardless of the observation position.

  In the display device of the present invention, it is preferable that the projection optical system has an angle of view (2ω) of 80 ° to 300 °, and the image projected from the projector forms an intermediate image once with an imaging lens. The projection lens is configured to be enlarged and projected.

  When the image is projected on the inner surface of the sphere in a range of 160 degrees or more, the image can be observed from all directions regardless of the observation position.

Here, the theory that the image can be observed from all directions regardless of the observation position when the image is projected onto the inner surface of the sphere in the range of 160 degrees or more will be described based on the spherical screen shown in FIGS.
FIG. 3 shows an example of the angle of view (2ω) = 220 degrees, and FIG. 4 shows an example of the angle of view (2ω) = 140 degrees.

  As shown in FIG. 3, when the angle of view (2ω) = 220 degrees, the image display range is G. By bringing the EP close to the sphere O, the image can be projected brightly and uniformly on the screen behind the EP. . Also, as shown in FIG. 4, when the angle of view (2ω) = 140 degrees, the image display range is G, and by making EP close to −R, an image can be projected brightly and uniformly over a wide range of the screen.

  The display device of the present invention preferably includes an optical system that bends the optical path.

  By providing an optical system that bends the optical path, the size can be reduced. For example, by arranging a deflecting prism between the projector and the spherical surface, the thickness can be reduced.

  Further, in the display device of the present invention, preferably, two spherical screens are arranged so as to be rotatable around an axis, and when one spherical screen is rotated, the other spherical screen is similarly rotated. At the same time, the optical system for bending the optical path is constituted by a prism, and the rotation angle of each spherical screen is set so that the optical path of the prism is secured.

  For example, when a spherical screen is used as a door knob, the rotation angle of the door knob is set in a range that secures the optical path of the prism that constitutes the optical system that bends the optical path. It becomes possible to use as.

  Alternatively, in the display device of the present invention, two spherical screens are arranged to be connected to each other by a connecting member facing each other with a flat plate member interposed between them so that the spherical screen can be rotated about the axis. Then, the other spherical screen rotates in the same manner, and one or two projectors are built in the flat plate member, and the light flux from the projector is projected onto the spherical screen by the optical path deflecting prism, and the spherical screen rotates. The angle (φ) is 0 ° <φ <350 °, and the connecting member is formed with a notch so as not to vignett the optical path from the projector.

  For example, by using a flat plate member as a door panel, a spherical screen as a door knob, and setting a rotation angle in the above range, the door knob can be used as a display device while exhibiting the function as a door knob.

  Alternatively, in the display device of the present invention, the projector and the deflection prism are provided in the pedestal, and the spherical screen is provided on the pedestal via the holding unit, and the optical path from the projector is bent at a substantially right angle by the deflection prism. The holding portion of the spherical screen is rotatable so that the optical path does not shine at the holding portion within the rotation angle range of the spherical screen. The rotation angle of the spherical screen is detected, and the image projected by the projector is rotated according to the rotation angle.

  Thinning is achieved by arranging a deflection optical path between the projector and the spherical screen. In addition, the spherical screen can be rotated by the holding unit, and the image projected by the projector rotates according to the rotation angle, so that the optical path is not vignetted by the holding unit within a certain rotation angle range. Since the notch is provided, the present invention can be applied to various uses in which an image is desired to be changed according to rotation.

  In the display device of the present invention, it is preferable that an image acquired by an imaging unit installed at an arbitrary location is input to the projector.

  There is no restriction on the image projected from the projector. For example, an image stored in a memory or a computer image may be displayed. Alternatively, an image pickup unit may be provided to display this image. For example, if the screen is a door knob and an imaging means is provided on the door panel, the state near the door can be observed on the screen.

  Furthermore, the display device of the present invention is the display device according to claim 10, which can be attached to an operation part or a main body part of an endoscope. When the spherical screen is rotated, the rotation angle is detected and rotated. The imaging means of the endoscope is rotated according to the angle.

  When the spherical screen is rotated, the imaging means of the endoscope rotates accordingly, so that the imaging direction of the endoscope can be observed and felt on the screen. In particular, it is suitable for observation of a hemispherical object such as a tank.

<Example 1>
Next, a basic configuration of the display device of the present invention will be described with reference to FIG.
The display device of the present invention includes a hollow spherical screen 1, a projection optical system 2 having a radial optical path disposed on the inner spherical side of the spherical screen 1, a deflection prism 3, and a projector 4. It is composed of

  The spherical screen 1 is a transparent body made of a synthetic resin such as glass or acrylic resin, the inner spherical surface 11 side is a diffusing surface and functions as a screen, and the outer spherical surface 12 side is a smooth polished surface. Yes. The size of the spherical screen 1 can be selected as appropriate, and the thickness of the spherical screen 1 can be selected as appropriate. Further, the spherical screen 1 may further have a transparent portion inside the inner spherical surface 11 serving as a diffusion surface.

  The projection optical system 2 is an afocal optical system, and includes a concave lens group 21 and a convex lens group 22 from the front. The angle of view (2ω) is 80 degrees to 300 degrees. Then, assuming that the spherical center point of the spherical screen 1 is 0 (zero) and the position of the inner spherical surface 11 is R, the exit pupil (EP) position 23 is in a range of + R / 2> EP> −2R. Is set. The projection optical system 2 is housed in a spherical holding part 5 that holds the spherical screen 1, and the spherical body holding part 5 is provided on a flat plate member 6.

  The projector 4 and the deflection prism 3 are housed in a flat plate member 6 serving as a pedestal, and an image projected from the projector 4 is provided on the flat plate member 6 with the optical path bent by the deflection prism 3. The light is projected onto the projection optical system 2 housed in the sphere holder 5.

  Since it is configured as described above, when an image is projected from the projector 4 at an angle of view w, it is bent at a substantially right angle by the deflecting prism 3. Since the projection optical system 2 is an afocal optical system, the angle of view w is enlarged to β × w. Then, the light is projected from the exit pupil position 23 onto the inner spherical surface 11 having a radius R at a field angle β × w (2ω). Then, light is diffused on the scattering surface of the inner spherical surface 1, and the image is observed from all directions of the outer spherical surface 12 through the transparent body of the spherical screen 1.

  In the present embodiment, since the projector 4 is disposed on the flat plate member 6, the entire apparatus is thin. Since the image is projected in all directions from the exit pupil position 5, the entire spherical screen 1 functions as a screen, and the image is displayed on the entire sphere. Further, since the position of the exit pupil and the spherical center of the inner sphere are close, a bright image can be seen from any orientation, and the image can be observed with little distortion.

  As a modification of the present embodiment, the deflecting prism 3 may not be provided so that the optical path is not bent halfway. With such a configuration, the image projected from the projector 4 is projected onto the projection optical system 2 housed in the sphere holder 5 provided on the flat plate member 6 without the optical path being bent halfway. The Rukoto. Depending on the application, the flat plate-like member 6 can be made vertical with respect to FIG.

  The present embodiment can be applied to, for example, a fortune-telling ball shown in FIG. 14 and a wall-embedded signal lamp shown in FIG. A wall-embedded signal lamp L shown in FIG. 17 is a signal lamp that emits light with an arbitrary color or image display by the operation of the remote controller R. Specific information can be displayed, not just light changes.

<Example 2>
Next, another example of the display device of the present invention will be described with reference to FIG.
The display device of the present invention includes a hollow spherical screen 1, a projection optical system 2 having a radial optical path disposed on the inner spherical side of the spherical screen 1, a deflection prism 3, and a projector 4. It is composed of

  The spherical screen 1 is a transparent body made of a synthetic resin such as glass or acrylic resin, the inner spherical surface 11 side is a diffusing surface and functions as a screen, and the outer spherical surface 12 side is a smooth polished surface. Yes. The size of the spherical screen 1 can be selected as appropriate, and the thickness of the spherical screen 1 can be selected as appropriate. Further, the spherical screen 1 may further have a transparent portion inside the inner spherical surface 11 serving as a diffusion surface. These are the same as in the first embodiment.

  In the projection optical system 2, the image projected from the projector 4 once forms an intermediate image 25 by the imaging lens 24, the optical path is bent by the deflecting prism 3, and then the image is enlarged and projected by the projection lens 26. ing. The angle of view (2ω) is 80 degrees to 300 degrees. Then, assuming that the spherical center point of the spherical screen 1 is 0 (zero) and the position of the inner spherical surface 11 is R, the exit pupil (EP) position 23 is in a range of + R / 2> EP> −2R. Is set. In the projection optical system 2, the projection lens 26 is housed in the spherical surface holding unit 5 that holds the spherical screen 1.

  The projector 4, the deflecting prism 3, and the imaging lens 24 of the projection optical system 2 are housed in a flat plate member 6 serving as a pedestal, and an image projected from the projector 4 is temporarily converted into an intermediate image 25 by the imaging lens 24. After the image is formed, the optical path is bent by the deflecting prism 3 and is projected onto the projection lens 26 of the projection optical system 2 housed in the sphere holder 5 provided on the flat plate member 6. Yes.

  In the illustrated embodiment, the spherical body holding portion 5 is provided so as to be rotatable with respect to the flat plate member 6 around the optical axis of the projection lens 25. Further, the spherical screen 1 also rotates integrally with the sphere holder 5, and a notch 51 as shown in FIG. 7 is formed on the side of the sphere holder 5 facing the projector 4. The notch 51 is for preventing the optical path from being vignetted by the sphere holder 5 when the sphere holder 5 rotates. Further, the opposite side of the spherical body holding part 5 to the notch 51 is formed so as to be screwed with the gear 7. When the spherical body holding part 5 rotates, the gear 7 rotates and the rotation angle is detected by the angle detection sensor 8. It has come to be. In addition, when the spherical body holding | maintenance part 5 does not rotate, such a mechanism is unnecessary.

  Since it is configured as described above, an intermediate image 25 is formed by the imaging lens 24 when an image is projected from the projector 4 at the angle of view w. The deflecting prism 3 can bend the optical path almost at right angles. The intermediate image 25 is magnified by the projection lens 26 and projected onto the inner sphere 11 having an angle of view θ and a radius R. Then, light is diffused on the scattering surface of the inner spherical surface 11, and the image is observed from all directions of the outer spherical surface 12 through the transparent body of the spherical screen 1.

  Further, the spherical holding portion 5, the projection lens 26, and the spherical screen 1 are integrally rotated around the optical axis of the projection lens 26, and when the spherical holding portion 5 is rotated, the gear 7 screwed with the spherical holding portion 5 is rotated. The rotation angle is detected by the angle detection sensor 8. Note that the rotation range of the sphere holder 5 rotates within the range of the sphere holder 5 notch 51 set so that the optical path between the projector 4 and the imaging lens 24 is not vignetted, for example, within ± 175 degrees. Like that.

  Then, the rotation angle detected by the angle detection sensor 8 may be fed back to change the image projected from the projector 4. In addition, a visible index or pattern is displayed on the spherical screen 1, and the coincidence of this index with an image displayed changing according to the rotation angle of the spherical screen 1 is recognized and fed back. Further, it may be reflected in the projected image.

This embodiment can be applied to, for example, a constellation horoscope ball as shown in FIG. A fortune telling sphere on which the moon is written on the surface of the outer spherical surface 12 of the spherical screen 1 is rotated, and an image relating to fortune telling is projected from the projector 4.
Further, the present invention can be applied to a celestial sphere or globe in which latitude and longitude are written on the surface of the outer spherical surface 12 of the spherical screen 1, or a game display sphere in which an outline is written.

<Example 3>
Next, another example of the display device of the present invention will be described with reference to FIG. In the present embodiment, two display devices according to the second embodiment described above are basically provided facing each other, and can be applied to, for example, a door knob. In this embodiment, the spherical screen 1 is used as the grip 14 of the door knob 13, and the flat plate member 6 is used as the door panel 61.

  The door knob 13 is provided across the door panel 61 so as to face the sphere connecting member 52 penetrating the door panel 61 and having the sphere holding portions 5 on both sides. The spherical connecting member 52 is rotatable with respect to the door panel 61. When one door knob 13 is rotated, the other door knob 13 is also rotated at the same time. The spherical connecting member 52 is formed with a notch 51 so that the optical path is not vignetted by the spherical connecting member 52 when the spherical connecting member 52 rotates.

  Two projectors 4 are provided in the door panel 61, and the images projected from the projectors 4 are transmitted through the wedge prism 27, and the intermediate image 25 is formed once by the respective imaging lenses 24. After the optical path is bent by the prism 3, the projection lens 26 enlarges and projects the light onto the grip 14 of each door knob 13.

  When the projector 4, the deflecting prism 3, and the projection optical system 2 are provided in the door panel 61, they may be provided as shown in FIG. FIG. 9A shows the projector 4 arranged vertically in the door panel 61 so that two deflection prisms 3 are combined. FIG. 9B shows one projector 4, in which an image projected from one projector 4 is projected onto the left and right grips 14 simultaneously by two deflecting prisms 3. . In this case, the same image is projected on the left and right. FIG. 9C shows one projector 4, in which an image projected from one projector 4 is projected simultaneously onto the left and right grips 14 by one deflecting prism 3. . In this case, the projected image can be divided into left and right images by dividing the projected image. In any case, the thickness can be the same as that of one projector. Therefore, it is possible to install the thin door panel 61 as compared with the case where two projectors are provided in the door panel.

  In this embodiment, an image is displayed on the grip 14 of the door knob 13. Then, by replacing the conventional door knob with the door knob display device of the present invention, the projector can be housed in the door, so that an image can be displayed on the grip 14 of the door knob 13 without performing a large-scale construction. Become. Note that basically, even if the door knob 13 is turned, the image displayed on the grip 14 is not rotated. Further, since the notch 51 is formed in the spherical connecting member 52, the image displayed on the grip 14 is not vignetted even when the door knob 13 is turned. Since the left and right door knobs 13 are connected by the spherical connecting member 52, they can be used like ordinary door knobs. It is possible to display an image recorded in a memory, a computer image, an image captured by a camera, and the like.

This embodiment is applicable to the doorknob display device shown in FIG. The grip 14 of the door knob 13 is the spherical screen 1 and is the display surface.
In the illustrated embodiment, the angle detection sensor 8 for detecting the rotation angle of the door knob 13 is not provided, but an angle detection sensor may be provided. It is also possible to provide imaging means such as a CCD camera in the vicinity of the door knob 13 of the door panel 61 and project the image onto the grip 14 of the door knob 13.

<Example 4>
Next, another example of the display device of the present invention will be described with reference to FIGS. This embodiment can be used for an endoscope for use in observation in a tank. Basically, the display device of the second embodiment is an endoscope main body 62, to which an insertion portion 100 provided with an imaging means 9 is attached. When the spherical screen 1 is rotated, this rotation angle is detected by an angle sensor. 8 is detected, and the imaging means 9 is rotated.

  The display device portion which becomes the endoscope main body 62 enables the spherical screen 1 to be rotated by a mechanism as shown in the second embodiment, for example, and the rotation angle is detected by the angle sensor 8. Further, the rotation range of the spherical screen 1 is adjusted to the size of the cutout portion 51 of the spherical body holding unit 5 so that the optical path is not vignetted by the rotation of the spherical screen 1.

  A distal end portion 101 is detachably disposed at the distal end of the flexible insertion portion 100, and an objective lens 91 and a CCD 92 constituting the imaging means 9 are provided at the distal end portion 101. The tip 101 rotates so as to change the photographing angle in accordance with the rotation angle of the spherical screen 1. The rotation of the CCD 92 causes the spherical screen 1 to have the spherical screen 1. An image corresponding to the rotation angle is projected.

  With this configuration, when the spherical screen 1 is rotated, the angle sensor 8 detects the rotation angle, and the angle of the tip 101 is changed accordingly, and the shooting direction and observation of the tip 101 are observed. The state can be realized with the spherical screen 1. In addition, since the negative distortion of the objective lens 91 and the positive distortion of the projection lens 26 are offset, the distortion is corrected, and the image on the spherical screen 1 becomes a display close to the actual display, and the distortion of the tip optical system is corrected. Easy to see. In particular, when a sphere such as a tank is observed, the state of the sphere of the inspected object 102 is reproduced easily on the display (observation side) sphere.

  This embodiment can be applied as, for example, an endoscope for inspecting a tank. Further, the shape of the spherical screen 1 matches the shape of the object to be inspected, and may be, for example, a hemispherical shape or a shape that is almost similar to a sphere.

<Example 5>
Next, another example in which the display device of the present invention is used in an endoscope will be described with reference to FIG. In this embodiment, the insertion part 100 is a rigid tube made of stainless steel tube. The insertion part 100 is provided with an LED 110 on the distal end side and an eyepiece 120 on the CCD 92 connection side. The insertion unit 100, the CCD 92, the projector 4, and the deflecting prism 3 are detachable. Then, as shown in FIG. 12B, the CCD 92, the projector 4, and the deflecting prism 3 are connected, the CCD 92 and the projector 4 are fixed, and the projector 4 and the deflecting prism 3 are rotatably connected. The projector 4 is rotatable with respect to the prism 3, and when the projector 4 is rotated, the CCD 92 is also integrally rotated.

  A spherical screen 1 is rotatably disposed on the deflection prism 3, and an image projected from the projector 4 is projected onto the spherical screen 1 by a projection optical system (not shown). Further, when the spherical screen 1 is rotated, an angle sensor (not shown) detects the rotation angle, and the projector 4 is rotated so as to change the photographing angle corresponding to the rotation angle of the spherical screen 1. As the projector 4 rotates, the CCD 92 also rotates at the same time, and an image corresponding to the rotation angle is projected onto the spherical screen 1.

  Further, instead of the spherical screen 1, the screen may be a circular flat screen 130 as shown in FIG. Also in the case of the flat screen 130, the display unit is formed to be a transparent body, the inner side being a diffusion surface, and the outer side being a mirror surface. The flat screen 130 and the spherical screen 1 may be exchangeable.

  With such a configuration, when the spherical screen 1 or the flat screen 130 is rotated, the projector 4 rotates, so that an image corresponding to the rotation angle is projected onto the spherical screen 1 or the flat screen 130. Will be. The projector 4 may be fixed and only the CCD 92 may rotate.

<Example 6>
Next, another example in which the display device of the present invention is used in an endoscope will be described with reference to FIG.
In the present embodiment, the insertion portion 100 of the fifth embodiment is a flexible serpentine tube, and the display portion is a rectangular flat screen 130 ′ or a spherical screen 1.
The insertion unit 100 is integrated with the projector unit 40, and the projector unit 40 includes an eyepiece lens 120, a CCD 92, a projector 4, and an imaging lens 24, as shown in FIG. The prism unit 30 includes the deflecting prism 3 and the projection lens 26, and the projector unit 40 can rotate in the arrow A direction with respect to the prism unit 30.

An image fiber 150 is provided in the insertion unit 100 and is imaged by the CCD 92 through the eyepiece 120.
The image projected from the projector 4 once forms an intermediate image 25 by the imaging lens 24 as in the second embodiment, the optical path is bent by the deflecting prism 3, and then the flat screen 130 ′ or the like is projected by the projection lens 26. An enlarged projection is made on the spherical screen 1.

Further, as a modification of FIGS. 13A and 13B, a case of a spherical screen is shown.
As shown in FIG. 13C, a screen fixing portion 140 is provided at the base of the spherical screen 1, and the spherical screen 1 is rotatably attached to the prism unit 30. Further, a screen fixing portion 140 for attaching the spherical screen is provided, the spherical screen 1 is fixed to a desk or the like, and the prism unit 30 is attached to the spherical screen 1 so as to be rotatable in the arrow B direction. .
The screen fixing unit 140 is provided with an arm 141 and a display device fixing unit 142, and can be fixed to an appropriate place by the display device fixing unit 142.
In the case of the flat screen 130 ′ shown in FIG. 13A, a screen fixing part 140 for attaching the flat screen 130 ′ may be provided, and the prism unit may be rotatable with respect to the flat screen 130 ′.

In this state, when the insertion unit 100 is inserted into the subject and an examination is performed, the insertion unit 100 may be twisted as necessary.
Since the projector unit 40 can rotate in the arrow A direction with respect to the prism unit 30, the insertion unit 100 and the projector unit 40 are rotated in the arrow A direction with respect to the lens unit 30 by twisting the insertion unit 100. It will be.
Further, since the spherical screen 1 and the flat screen 130 ′ are attached to the prism unit 30 so as to be rotatable in the arrow B direction, the insertion unit 100, the projector unit 40, and the prism unit are moved up and down. 30 portions are integrally rotated in the direction of arrow B.
By enabling rotation in the A direction and the B direction, there is an advantage that an excessive force is not applied to the base of the insertion portion 100 even if the insertion portion 100 is moved up and down or rotated.

  Further, as in the fifth embodiment, when the spherical screen 1 or the flat screen 130 ′ is rotated, the projector 4 rotates, and an image corresponding to the rotation angle is projected onto the spherical screen 1 or the flat screen 130 ′. When the spherical screen 1 or the flat screen 130 ′ is rotated, the projector 4 rotates, and an image corresponding to the rotation angle is projected onto the spherical screen 1 or the flat screen 130 ′. Will be

  The endoscope may be a video scope provided with a CCD at the tip. In this case, the eyepiece lens and the CCD are not provided on the hand side, and the structure is such that the CCD signal at the tip is input to the projector.

  The scope of application of the present invention is not limited to the above embodiment, and there is no limitation on the shape and size of the screen and the size of the spherical screen, so it can be used for various purposes from entertainment to practical use. Is possible.

DESCRIPTION OF SYMBOLS 1 Spherical screen 11 Inner spherical surface 12 Outer spherical surface 13 Door knob 14 Gripping part 2 Projection optical system 21 Concave lens group 22 Convex lens group 23 Exit pupil position 24 Imaging lens 25 Intermediate image 26 Projection lens 27 Wedge prism 3 Deflection prism 30 Prism unit 4 Projector 40 Projector unit 5 Sphere holder 51 Notch 52 Spherical connecting member 6 Flat member 61 Door panel 62 Endoscope body 7 Gear 8 Angle detection sensor 9 Imaging means 91 Objective lens 92 CCD
100 Insertion portion 101 Tip portion 102 Inspected object 110 LED
120 Eyepiece 130, 130 'Flat screen 140 Screen fixing part 141 Arm 142 Display device fixing part 150 Image fiber

Claims (15)

Screen,
A projection optical system arranged inside the screen;
An optical system that bends the optical path;
A projector,
A display device, wherein the screen is a transparent member whose outer surface is a smooth surface and whose inner surface is a diffusion surface. The screen is
The display device according to claim 1, wherein the display device has a flat plate shape. The screen is
The display device according to claim 1, wherein the display device has an arbitrary curved surface portion. The display device according to any one of claims 1 to 3, which can be attached to an operation unit or a main body of an endoscope,
When the screen is rotated, the rotation angle is detected, and the imaging means of the endoscope is rotated according to the rotation angle. The screen is a spherical screen,
A projection optical system having a radial optical path disposed on the spherical center side which is the inside of the screen;
And a projector. The spherical screen is
6. The display device according to claim 5, wherein the outer surface is a smooth surface and the substantially concentric inner spherical surface is a substantially spherical hollow screen made of a transparent member having a diffusing surface. The exit pupil (EP) position of an optical system having a radial optical path is:
When the spherical center point is 0 (zero) and the position of the inner spherical surface is R,
+ R / 2>EP> -2R
The display device according to claim 6, wherein the display device is a display device. The projection optical system is
The angle of view (2ω) is 80 to 300 degrees,
The display device according to claim 7, comprising an afocal optical system that expands an optical path of the projector. The projection optical system is
The angle of view (2ω) is 80 to 300 degrees,
After the image projected from the projector forms an intermediate image once with the imaging lens,
The display device according to claim 7, wherein the display device is configured to be enlarged and projected by a projection lens.   The display device according to claim 5, further comprising an optical system that bends the optical path. The two spherical screens are rotatably arranged around an axis, and when one of the spherical screens is rotated, the other spherical screen is similarly rotated,
9. The display device according to claim 8, wherein an optical system for bending the optical path is configured by a prism, and the rotation angle of each spherical screen is set so that the optical path of the prism is secured. . Two spherical screens are arranged to be connected to each other by connecting members so as to be rotatable around an axis with a flat plate-like member interposed therebetween. When one spherical screen is rotated around the axis, the other spherical screen is also the same Rotate to
One or two projectors are built in the flat plate member,
The light beam from the projector is projected onto the spherical screen by an optical path deflecting prism,
The rotation angle (φ) of the spherical screen is 0 degree <φ <350 degree,
The display device is characterized in that a cutout portion is formed in the connecting member so as not to vignett the optical path from the projector. A projector and a deflecting prism are provided in the pedestal, and a spherical screen is provided on the pedestal via a holding unit,
The optical path from the projector is bent at a substantially right angle by the deflecting prism so as to coincide with the rotational axis of the spherical screen,
The holding portion of the spherical screen is rotatable, and a notch portion is provided in the holding portion so that an optical path is not vignetted by the holding portion in the range of the rotation angle of the spherical screen,
The display device is characterized in that a rotation angle of the spherical screen is detected, and an image projected by the projector is rotated according to the rotation angle. The projector includes
The display device according to claim 1, wherein an image acquired by an imaging unit installed at an arbitrary location is input. The display device according to claim 10, attachable to an operation part or a main body part of an endoscope,
When the spherical screen is rotated, the rotation angle is detected, and the imaging means of the endoscope is rotated according to the rotation angle.

Images